Das L3S ist ein Forschungszentrum für grundlagen- und anwendungsorientierte Forschung im Bereich Digitale Transformation sowie Data- und Web-Science. L3S-Forscher entwickeln zukunftsweisende Methoden und Informationstechnologien für intelligente, zuverlässige und verantwortungsvolle Systeme, welche zur Gestaltung der digitalen Transformation und zur nachhaltigen Innovation beitragen. Der Wissentransfer in Wirtschaft, Politik und Gesellschaft bildet einen zentralen Baustein der Aktivitäten des L3S.

Das L3S erforscht die Auswirkungen des digitalen Wandels, um aus den Erkenntnissen Handlungsoptionen, -empfehlungen sowie Innovationsstrategien für die Wirtschaft, die Politik und Gesellschaft herzuleiten. Durch Forschung, Entwicklung und Beratung trägt das L3S gemeinsam mit seinen Partnern zur digitalen Transformation insbesondere in den Bereichen Mobilität, Gesundheit, Produktion und Bildung bei.

Das L3S ist eine gemeinsame Einrichtung der Leibniz Universität Hannover und der Technischen Universität Braunschweig mit rund 150 Wissenschaftlern aus unterschiedlichen Disziplinen an Universitäten und einem Leibniz-Institut (der TIB). Das aktuelle jährliche Drittmittelvolumen des L3S beträgt etwa 6 Mio. Euro, Niedersachsen fördert das L3S zusätzlich mit jährlich etwa 2 Mio. Euro. Das L3S wurde 2011 und 2014 vom Wissenschaftsrat als exzellente Einrichtung evaluiert, führend im Bereich Web Science.

• Deep unlearning: my journey from AI idealist to tech realist Gebru, Timnit (2027). One Signal, New York.

  The former leader of the AI ethics team at Google, who was fired for raising the alarm about bias, Timnit Gebru, chronicles her journey as a refugee and Black woman in STEM, delivering an inspiring vision for better, human-centered, equitable technology.
• LABORATORYINVESTIGATION ONRE-USING POLYETHYLENE(PLASTIC)BAGWASTEMATERIAL FORSOILREINFORCEMENT INGEOTECHNICAL ENGINEERING. Chebet1, F.C.; Kalumba2, D. (F. Chebet1; D. Kalumba2, eds.) (2026).
• Classical SU. Fulton, Christopher P.; Tsapara, Irene; Fulton, Lawrence V. (2026).
• Fueling thermogenesis: an individual-level thermography assay reveals that sucrose ingestion promotes thermogenesis in honeybees. Delac, Saskia; von Koschitzky, Christine; Thamm, Markus (2026). 229(18) jeb252296.

  Western honeybees (Apis mellifera) are remarkable among insects for their ability to generate heat endogenously and maintain a stable hive microclimate. This process relies on the activity of the indirect flight muscles, but the direct relationship between thermogenesis and carbohydrate availability has not been systematically investigated. To investigate this relationship, we developed a controlled individual-level thermography assay that provides a standardized framework for studying honeybee thermogenesis at the individual level. Starved bees showed little or no thermogenesis, whereas sucrose-fed bees exhibited substantially increased thoracic temperatures and thermogenic activity, consistent with a threshold-like activation of thermogenesis. Additionally, thermogenic performance was significantly lower in bees fed a sucralose solution used as a putatively non-nutritive control than in bees that received the same volume of sucrose solution. Together, these findings support the hypothesis that thermogenesis depends on the availability of recently ingested carbohydrates.
• MuRS 2026: 4th Music Recommender Systems Workshop. Ferraro, Andres; Porcaro, Lorenzo; Moscati, Marta; Bauer, Christine in RecSys ’26 (2026). 1855–1857.

  Music recommendation has been a core area of interest within the recommender systems community since its early days. With the rise of music streaming platforms, algorithmic recommendations have become central to the music industry. However, critical challenges remain concerning the design, evaluation, and societal impact of music recommender systems. This fourth edition of the Music Recommender Systems Workshop (MuRS) centers on the growing influence of generative content on music recommendation. The rapid influx of AI-generated music transforms the streaming ecosystem, raising critical questions about discoverability, authenticity, and the curational role of recommender systems. The challenges and opportunities associated with AI-generated content extend beyond music and recommender systems, demanding transparent, fair, and accountable recommendation frameworks that reflect the interests of the diverse set of stakeholders.
• Beyond Algorithms: A Workshop on the Interdisciplinarity of Recommender Systems (BEYOND 2026). Bauer, Christine; Zangerle, Eva; Said, Alan in RecSys ’26 (2026). 1847–1848.

  Recommendation and personalization research is no longer confined to computer science. Relevant questions are actively explored across disciplines including information systems, communication science, management, cognitive science, psychology, education, media studies, marketing, and the social sciences, often grounded in distinct theories, methods, and evaluation traditions. “Beyond Algorithms: A Workshop on the Interdisciplinarity of Recommender Systems” (BEYOND 2026) aims to create a dedicated space at ACM RecSys 2026 to connect these perspectives. The workshop highlights how insights from adjacent fields can complement, extend, and sometimes challenge computing-centric approaches. It explicitly welcomes contributions studying recommendation, personalization, and related phenomena outside core computing venues, as well as integrative work that bridges computational and non-computational approaches. Through presentations and interactive discussions, we aim to surface diverse theoretical frameworks, methodological traditions, and evaluation paradigms. Our goal is to foster dialogue across disciplinary boundaries, make disciplinary assumptions explicit, and identify shared research challenges and opportunities for collaboration. By strengthening ties between the RecSys community and neighboring research traditions, BEYOND 2026 seeks to broaden participation and visibility for interdisciplinary research and to position RecSys as a hub for both technical innovation and cross-disciplinary exchange.
• Competing ordering modes in the distorted quantum kagome material clinoatacamite Cu\($_\mathbf2$\)Cl(OH)\($_\mathbf3$\). Stödter, L.; Kastner, C.; Jeschke, H. O.; Reehuis, M.; Chan, E.; Lemée-Cailleau, M.-H.; Beauvois, K.; Ouladdiaf, B.; Yokaichiya, F.; Bert, F.; Hicken, T. J.; Krieger, J. A.; Luetkens, H.; Allen, J. L.; Feyerherm, R.; Tovar, M.; Menzel, D.; Wolter, A. U. B.; Büchner, B.; Rule, K. C.; Litterst, F. J.; Rössler, U. K.; Süllow, S. (2026). 137(11) 116701.

  We have studied the magnetic properties of clinoatacamite \($\mathrmCu_2\mathrmCl(\mathrmOH)_3$\), the parent compound of the quantum spin liquid candidate herbertsmithite and a long-standing puzzle among frustrated quantum magnets. As we reveal using density-functional theory, clinoatacamite belongs to the class of distorted kagome antiferromagnets with the kagome plane being embedded into a low-symmetry crystal structure. By means of thermodynamic measurements, muon spin rotation and relaxation, as well as neutron diffraction on single crystals, we find in zero magnetic field complex behavior below \($T_\mathrmI=18.1\text \text \mathrmK$\) which unfolds in three temperature regions I--III. We propose this complexity in multicritical clinoatacamite to arise from the competition of antiferromagnetic ordering modes from the underconstrained manifold of modes, which can lead to a metamagnetic texture in zero field.
• Dirac semimetal phases in chiral carbon nanoscrolls. Hsu, Tzu-Ching; You, Jhih-Shih; Hsu, Hsiu-Chuan; Fulga, Ion Cosma (2026). 114(17) 175402.

  Chirality induced by rolling a two-dimensional material into a spiral geometry reshapes its electronic band structure. In this work we theoretically investigate the topological properties of carbon nanoscrolls under an axial magnetic field, focusing on structures in which chirality is encoded through shifted edge alignments. In contrast to unshifted structures, where mirror symmetry pins the Dirac cones to half a flux quantum, chiral carbon nanoscrolls lack this symmetry, and Dirac cones emerge at magnetic flux values away from half a flux quantum. We demonstrate that these Dirac cones are topologically protected by combined inversion--time-reversal symmetry and remain robust even when sublattice symmetry is broken. Furthermore, we show that the number of Dirac cones and their real-space probability distributions depend on the number of turns and the magnetic field strength. Our study elucidates the role of chirality in the band topology of nanoscroll geometries.
• Plasmon excitations in half-filled graphene: A comparative study between quantum Monte Carlo and random phase approximation. Reingruber, Adrien; Ulybyshev, Maksim; Pongsangangan, Kitinan (2026). 114(16) 165114.

  Transport properties of strongly correlated materials have contributions from quasiparticle excitations such as electrons and holes as well as emerging collective excitations such as plasmonic soundlike modes which are sustained by interactions. It was previously shown by Pongsangangan et al. [Phys. Rev. B 106, 205127 (2022)] that the thermal excitation of the long-lived plasmons in graphene provides a substantial contribution to heat and momentum transport in the interaction-dominated regime. Detailed information on these excitations is therefore necessary for the understanding of hydrodynamic transport with quantitative precision. On the other hand, dynamics of graphene plasmons is usually studied using perturbation theory within the Dirac cone approximation, thus neglecting the effects of a finite Brillouin zone (BZ) and higher-order perturbative corrections. Both these effects can be, however, significant for strong-interacting systems including free-standing graphene, where the effective coupling constant can reach values up to \($\ensuremath\alpha=\frace^2\ensuremath\hbarv_\mathrmF=2$\). Consequently, in this paper, we study the behavior of plasmons in half-filled free-standing graphene using unbiased quantum Monte Carlo (QMC) calculations. We confirm the existence of well-defined resonance peaks for plasmons around the \($\mathrm\ensuremath\Gamma$\) point. Comparison with the random phase approximation (RPA) calculation for the honeycomb lattice shows qualitative agreement with QMC. However, RPA yields more stable plasmon modes, while QMC shows enhanced broadening due to nonperturbative interaction effects naturally included in the simulations. To account for this effect, we generalize the calculation of lattice RPA by dressing the fermionic propagator by a constant lifetime. As a result, the plasmon frequencies are shifted toward higher energies, and the spectrum is broadened, yielding better agreement with QMC. Our findings highlight the need to account for both a finite BZ and strong interaction effects when developing theories of electronic transport in free-standing graphene.
• Topological edge states emerging from twisted moiré bands. Saleem, Yasser; Potasz, Pawel; Dyrdal, Anna; Trauzettel, Björn; Hankiewicz, Ewelina M. (2026). 114(18) 185114.

  We study twisted bilayer \($\mathrmWSe_2$\) within a continuum moir'e model and apply a method for treating finite geometries directly in the continuum framework, thereby avoiding the limitations associated with purely momentum-space formulations and Wannier obstructions. By projecting a confinement potential onto bulk moir'e eigenstates, we obtain a real-space description of edge physics without lattice models. Applying this approach to nanoribbons, we demonstrate chiral edge modes consistent with bulk Chern numbers and reveal their moir'e-scale character. In the magic-angle regime, these states are strongly localized, exhibit layer-polarized counterpropagating modes, and are electrically tunable via a displacement field, enabling control of localization, hybridization, and topological transitions. Our results establish a general framework for boundary physics in topological moir'e materials.
• Bridging the gap between numerics and experiment in freestanding graphene. Ulybyshev, Maksim; Zafeiropoulos, Savvas; Winterowd, Christopher; Assaad, Fakher (2026). 114(18) 185110.

  Here, the authors revisit the question of the logarithmic renormalization of the Fermi velocity in graphene. Using large-scale Quantum Monte Carlo simulations of lattices with up to \($2\ifmmode\times\else\texttimes\fi10^4$\) interacting electrons, they directly connect experimental data with unbiased, nonperturbative calculations starting from a microscopic Hamiltonian. Their results reveal that even random-phase approximation corrections are quantitatively insufficient at realistic interaction strengths for suspended graphene, while continuum perturbation theory misses important lattice-scale effects. Remarkably, the optical conductivity still remains constant pointing to exact cancellation of different corrections.
• Giant thermopower changes related to the resistivity maximum and colossal magnetoresistance in EuCd\($_\mathbf2$\)P\($_\mathbf2$\). Grafenhorst, Judith; Krebber, Sarah; Kliemt, Kristin; Krellner, Cornelius; Hassinger, Elena; Stockert, Ulrike (2026). 137(10) 106302.

  The electronic properties of materials exhibiting giant thermopower with a thermopower that exceeds 2000 ensuremathmuV/K, such as EuCd\($_2$\)P\($_2$\), are strongly temperature dependent.
• Experimental realization of the topologically nontrivial phase in monolayer Si\($_\mathbf2$\)Te\($_\mathbf2$\). Huang, Xiaochun; Zhao, Lingxiao; Xiong, Rui; Li, Wenbin; Wang, Bao-Tian; Sa, Baisheng; Bode, Matthias (2026). 17(1) 9741.

  Quantum spin Hall insulators, with dissipationless edge channels protected by time-reversal symmetry, are promising for low-power and quantum devices. However, experimentally realized examples with sizable nontrivial gaps remain scarce. Monolayer Si2Te2 has been theoretically predicted to host a room-temperature quantum spin Hall phase, but the absence of a bulk analog has hindered its experimental realization. Here we show that HfTe2 provides an ideal van der Waals template for the epitaxial growth of strain-free monolayer Si2Te2 while preserving its nontrivial topological phase. Scanning tunneling microscopy and spectroscopy reveal an intact (1\texttimes1) lattice and a bulk band gap of  textasciitilde 300 meV, consistent with first-principles calculations. Moreover, pronounced edge states extending textasciitilde 2.0 nm from the island boundary are observed in monolayer Si2Te2, exhibiting characteristics expected for topological edge modes. Our results establish monolayer Si2Te2 as a large-gap two-dimensional topological-insulator platform for topological phenomena and device concepts at elevated temperatures.
• Geometrically frustrated quadrupoles on the pyrochlore lattice and generalized spin liquids. Chung, Kristian Tyn Kai; Petit, Sylvain; Robert, Julien; McClarty, Paul (2026). 16(3) 031065.

  A semiclassical framework models quantum quadrupoles as biaxial tensors, showing how angular-momentum-dependent geometries dictate generalized nematic phases and quadrupolar spin liquids in frustrated magnets.
• One-dimensional conduction channels in the correlated Mott NiS\($_\mathbf2$\) arising from obstructed Wannier charges. Iraola, Mikel; Guo, Haojie; Orlandi, Fabio; Klemenz, Sebastian; Soldini, Martina O.; Sajan, Sandra; Manuel, Pascal; van den Brink, Jeroen; Neupert, Titus; Ugeda, Miguel M.; Schoop, Leslie M.; Vergniory, Maia G. (2026). 17(1) 9641.

  NiS2, a material long recognized for its non-collinear magnetic order and correlated insulating behavior, has until now been entirely overlooked as a potential host of topological phenomena. Bulk NiS2 is known to be a Mott or charge-transfer insulator, yet its surface exhibits anomalous finite conductivity of unclear origin. Additionally, a definitive consensus regarding its low-temperature magnetic transition remains elusive. In this work, we provide a unified explanation for both of these longstanding puzzles. First, we present a refined characterization of NiS2's magnetic phases by proposing a novel ground state based on a rigorous symmetry analysis of high-resolution neutron scattering data. Second, through high-resolution scanning tunneling microscopy and spectroscopy (STM/STS), we reveal the presence of robust edge states on both Ni- and S-terminated surfaces, which persist even under applied magnetic fields. Using ab initio calculations combined with topological analysis, we attribute these edge states to obstructed atomic charges arising from the bulk's obstructed nature. Altogether, this study not only sheds new light on the physics of NiS2, but also establishes a solid experimental and theoretical foundation for exploring the interplay between topology and electronic correlations.
• Observation of the amplified transverse thermoelectric signals by reduced-dimensionality transport anisotropy. Wang, Honghui; He, Bin; Feng, Xiaolong; Hu, Haihua; Koban, Ralf; Schnelle, Walter; Cheng, Erjian; Pan, Yu; Zhou, Xiaoyuan; Felser, Claudia (2026). 17(1) 9607.

  Transverse thermoelectric devices offer simplified geometries with flexible designs for next-generation cryogenic technologies. However, mechanisms on geometrical amplification of transverse thermoelectric effects remain elusive. Here we establish a general framework linking reduced dimensionality with its geometrical anisotropy to enhanced transverse thermoelectric responses. Taking quasi-one-dimensional Li0.9Mo6O17 as a model platform, we combine theoretical modeling with systematic experiments to reveal extraordinarily large Nernst and Ettingshausen signals, reaching 11,430 \($\mu$\)V/K (25\thinspaceK, 9\thinspaceT) and 0.0063thinspaceKthinspacetextperiodcenteredthinspacem/A (43.1\thinspaceK, 9\thinspaceT), respectively, together with a high power factor of 814 \($\mu$\)W cm−1 K−2 at 25thinspaceK and 9thinspaceT. Dimensional reduction amplifies the Seebeck-driven electric field and enhances the reduced mobility through anisotropic Fermi surface geometry. These effects yield the transverse thermoelectric response far exceeding those of higher-dimensional systems with even ultrahigh carrier mobilities. Our findings highlight enhanced geometrical anisotropy as a powerful principle of design for engineering high-performance transverse thermoelectric systems.
• Many-body cages: disorder-free glassiness from flat bands in fock space and many-body Rabi oscillations. Ben-Ami, Tom; Heyl, Markus; Moessner, Roderich (2026). 137(10) 100401.

  We introduce many-body caging as a novel mechanism for nonthermal behavior in quantum matter. We define many-body cages as eigenstates that, through quantum interference, become localized on a subgraph of the many-body state graph. These many-body cages can lead to the formation of flat bands in the many-body spectrum at characteristic, system-independent energies. These flat bands can realize a novel type of glassy eigenspectrum order in the absence of disorder, which we quantify by a band-overlap order parameter with an intricate, possibly fractal, distribution over the many-body state graph. We further show that these many-body cages exhibit distinctive signatures in experimentally accessible quantities, such as through a nonvanishing long-time memory of the initial condition, and many-body Rabi oscillations set by the characteristic flat-band energies. While our predictions in principle apply to any constrained quantum system, we demonstrate them here for 2D lattice gauge theories and models relevant for current experiments in Rydberg atoms. We expect that these many-body cages offer a promising route to realize nonequilibrium quantum states with novel properties.
• Superconductivity in epitaxial PtSb(0001) thin films. Müller, C.; Bommanaboyena, S. P.; Badura, A.; Uchimura, T.; Husstedt, F.; Schwarze, B. V.; Banerjee, S.; Ledinsk’y, M.; Michalicka, J.; M’iifmmode checkselse vsfiek, M.; Proschek, P.; ifmmode checkSelse vSfiindler, M.; Timm, C.; Helm, T.; Fukami, S.; Krizek, F.; Kriegner, D. (2026). 10(9) 094801.

  Building on earlier reports of superconductivity in bulk PtSb, we present a systematic study of superconductivity in epitaxial PtSb(0001) thin films grown on \($\textSrF_2(111)$\). Electrical transport measurements reveal a superconducting transition at \($T_\mathrmc=1.72\phantom\rule0.16em0ex\mathrmK$\). The field-induced broadening of the transition and the temperature dependence of the upper critical fields are consistent with type-II superconductivity. We determine the upper critical fields for magnetic fields applied perpendicular and parallel to the film plane and parametrize their temperature dependence using an anisotropic Ginzburg-Landau approach. For a representative film in the intermediate thickness regime (\($d=50\phantom\rule0.16em0ex\mathrmn\mathrmm$\)), we obtain coherence lengths of \($\ensuremath\xi_ab\ensuremath\approx56\phantom\rule0.16em0ex\mathrmn\mathrmm$\) and \($\ensuremath\xi_c\ensuremath\approx14\phantom\rule0.16em0ex\mathrmn\mathrmm$\). Current-voltage characteristics show sizable critical currents, with a critical current density reaching \($J_\mathrmc\ensuremath\approx6\ifmmode\times\else\texttimes\fi10^4\phantom\rule0.16em0ex\mathrmA/\textcm^2$\) at \($0.5\phantom\rule0.16em0ex\mathrmK$\). These results establish the superconducting properties of epitaxial PtSb thin films and provide a basis for lattice-matched heterostructures within the NiAs-type materials family.
• Kinetic kagome magnetism: from self-trapping RVB polarons to semiclassical correlations. Pei, Yufei; Chen, Shuai A.; Castelnovo, Claudio; Moessner, Roderich (2026). 137(10) 106702.

  A study of the counter-Nagaoka problem of a single hole in an infinite-\($U$\) Hubbard model on the kagome lattice reveals a new type of polaron, a resonating-valence-bond polaron that morphs into semiclassical order as polarization is reduced.
• Role of defects in the paramagnetism of Fe-doped Cs\($_\mathbf2$\)AgBiBr\($_\mathbf6$\) double perovskite. Vasylkovskyi, Volodymyr; Trukhina, Olga; Dörflinger, Patrick; Slipchenko, Mykola; Schmidt, Wolf Gero; Biktagirov, Timur; Sperlich, Andreas; Kultaeva, Anastasiia; Kopelevich, Yakov; Dyakonov, Vladimir (2026). 10(8) 084410.

  Transition-metal doping enables the introduction of spin functionality into halide double perovskites, while simultaneously modifying optical properties. Here, we combine controlled single-crystal growth, optical characterization, comprehensive electron paramagnetic resonance (EPR) spectroscopy, and first-principles modeling to identify the microscopic nature of Fe-related centers in Fe-doped \($\mathrmCs_2\mathrmAgBiBr_6$\). Single crystals with nominal \($\mathrmF\mathrme^3+$\) concentrations up to 15% in the precursor stage were grown using a controlled-cooling method, yielding reproducible Fe incorporation up to 0.1% with respect to Bi, without secondary phases. Despite this low concentration, Fe doping introduces electronic states that influence optical absorption and photoluminescence. EPR measurements reveal an S = 5/2 \($\mathrmF\mathrme^3+$\)-related center whose anisotropy follows the cubic-to-tetragonal phase transition below 120 K. Angular-dependent EPR resolves two configurations of this nearly axial spin center, with principal axes rotated by 90ifmmode^circelsetextdegreefi and aligned with the a/b plane of the tetragonal lattice. Density-functional calculations attribute these centers to impurity-vacancy complexes, most likely \($\mathrmFe_\mathrmBi\text\ensuremath-\mathrmV_\mathrmBr$\), that stabilize in a basal configuration of the low-temperature phase. This approach resolves vacancy-coupled defect orientations, narrowing possible models to \($\mathrmF\mathrme^3+$\)-vacancy complexes and establishing them as stable, orientation-sensitive spin probes of structural symmetry in halide double perovskites, while providing a microscopic basis for tuning their magnetic and optical responses.
• Altermagnetism-induced Bogoliubov fermi surfaces form topological superconductivity. Fu, Bo; Li, Chang-An; Trauzettel, Björn (2026). 137(9) 096604.

  Topological superconductivity and Majorana zero modes emerge from two feasible platforms, quasi-1D nanowires and vortex-line heterostructures, when crystal anisotropy and quantum confinement act as tuning parameters.
• TRACE-CRC: Trajectory-Adaptive Conformal Risk Control for Multi-Step Channel State Information Prediction. Rezaei, Kiarash; Sattari, Mehdi; Aliakbari, Javad; Svensson, Tommy; Monti, Paolo; Natalino, Carlos (E. Ahlberg; U. Johansson; H. Boström; A. Carlevaro; J. Hallberg Szabadváry; L. Carlsson, eds.) (2026). 329 984–1009.

  Reliable prediction of time-varying channel state information (CSI) is essential for efficient wireless communication. Each CSI frame is a matrix-valued representation of the wireless channel response, and a sequence of CSI frames forms a temporal channel trajectory. Modern deep learning-based CSI predictors, however, often provide only point predictions and lack calibrated uncertainty estimates. This limitation is particularly problematic in multi-step CSI prediction, where the target is a sequence of future CSI matrices, and downstream decisions such as beamforming or scheduling may fail if any part of the predicted trajectory is unreliable. We propose trajectory-adaptive calibration and error profiling with conformal risk control (TRACE-CRC), a method for trajectory-aware uncertainty quantification in multi-step CSI prediction. TRACE-CRC constructs Frobenius-norm uncertainty balls around predicted CSI matrices and controls the risk that at least one future frame is uncovered. Instead of calibrating each future step independently, TRACE-CRC combines future-step-dependent error profiling, trajectory difficulty stratification, and learn-then-test (LTT) risk control. Empirically, TRACE-CRC achieves reliable trajectory-level coverage with substantially smaller uncertainty balls than conservative multi-step corrections, while avoiding the trajectory undercoverage of compact stepwise and adaptive conformal base-lines.
• An Exposition of the ~O. Bansal, Nikhil; Jiang, Haotian (2026).
• Orbital Wigner functions and quantum transport in multiband systems. Mitscherling, Johannes; Borgnia, Dan S.; Ahuja, SuryaNeil; Moore, Joel E.; Bulchandani, Vir B. (2026). 114(17) 175111.

  Traditional theories of electron transport in crystals are based on the Boltzmann equation and do not capture physics arising from quantum coherence. We introduce a transport formalism based on orbital Wigner functions, which accurately captures quantum coherent physics in multiband fermionic systems. We illustrate the power of this approach compared with traditional semiclassical transport theory by testing it numerically against microscopic simulations of one-dimensional, noninteracting, two-band systems---the simplest systems capable of exhibiting interorbital coherence. We show that orbital Wigner functions accurately capture strongly nonequilibrium features of electron dynamics that lie beyond conventional Boltzmann theory, such as the ballistic transport of a relative phase between microscopic orbitals and topological Thouless pumping of charge, both at nonzero temperature and away from the adiabatic limit. Our approach is motivated in part by modern ultracold atom experiments that can prepare and measure far-from-equilibrium charge transport and phase coherence in multiband fermionic systems, calling for correspondingly precise theories of transport. The quantitative accuracy exhibited by our approach, together with its capacity to capture nontrivial physics even at the ballistic scale, establishes orbital Wigner functions as an ideal starting point for developing a fully systematic theory of transport in crystals.
• Intracellular Staphylococcus aureus triggers isolate-specific host transcriptional responses alongside TNF-R1 regulated cell fate decisions. Walter, Annika; Bischler, Thorsten; Jungblut, Marvin; Breitsprecher, Leonhard F.; Vilotic, Filip; Beck, Johanna; Hofmann, Lucia; Schäfer, Nicole; Ziesmann, Tanja; Franzkoch, Rico; Härteis, Silke; Gadjalova, Iana; Distler, Ute; Beliu, Gerti; Psathaki, Olympia-Ekaterini; Hensel, Michael; Schneider-Brachert, Wulf; Gräfenhan, Tom; Stempfl, Thomas; Kieninger, Bärbel; Mühlen, Sabrina; Alt, Volker; Mannala, Gopala-Krishna; Fritsch, Jürgen (2026). 24(1) 515.

  Staphylococcus aureus (S. aureus) is an increasingly recognized intracellular pathogen, yet infection outcomes vary with bacterial isolate and host cell type. Many mechanisms underlying these differences remain poorly understood. This study investigated how distinct intracellular S. aureus isolates influence host signaling programs and infection outcomes by modulating cell death pathways and TNF-R1 dependent regulation of host cell fates across different human cell lines.
• A Taxonomy and Research Agenda for Generative User Interfaces. Pott, Katja; Rietsche, Roman; Söllner, Matthias; Wambsganss, Thiemo (2026). 1–3.
• What Does Pruning Actually Buy? Memory and Inference Time in Predictive Maintenance Models. Grillmeyer, Daniel; Turhal, Sükrü; Kounev, Samuel (2026).
• What Does Pruning Actually Buy? Memory and Inference Time in Predictive Maintenance Models. Grillmeyer, Daniel; Turhal, Sükrü; Kounev, Samuel (2026).
• Personalization of Information Systems: A Taxonomy and Research Agenda for Generative User Interfaces. Pott, Katja; Rietsche, Roman; Söllner, Matthias; Wambsganss, Thiemo (2026).

  The novel paradigm of Generative user interfaces introduces a shift from predefined, static interfaces toward dynamically generated and contextually adaptive user experiences. While personalization in Information Systems (IS) is well established, it has largely focused on adapting content and functionality, whereas the user interface itself often remains predefined and static. Generative user interfaces address this limitation by leveraging generative artificial intelligence to generate front-end code, constructing and adapting interface components at runtime based on users’ needs, preferences, and context. This promises to not only enhance personalization but also disrupt current IS development. Yet, this emerging implementation raises fundamental questions for IS design and development. Although Generative user interfaces have recently attracted research interest in Human–Computer Interaction, there remains a lack of shared conceptual understanding of their design characteristics and implications for IS development. To address this gap, we develop a taxonomy that identifies these characteristics based on a Socio-Technical Systems perspective. We validate our taxonomy with experts and formulate a research agenda for Generative user interfaces, using the taxonomy as a conceptual foundation to guide future IS research.
• Towards a Multi-Agent LLM-Based Tutoring Tool for Mathematical Argumentation Skills. Koulani, Huda; Marchionne, Lucia; Schmidtpott-Schulz, Hendrikje; Eichler, Andreas; Bley, Andreas; Söllner, Matthias in Lecture Notes in Computer Science (2026). (Vol. 16607) 68–79.

  Mathematical argumentation is a core competence that integrates mathematical reasoning with broader critical thinking skills, enabling students to construct coherent and logically structured arguments to evaluate mathematical claims. This skill is essential for undergraduate students across disciplines such as information systems, mathematics, and computer science—yet many struggle to develop it. Recent advances in Large Language Models (LLMs) and multi-agent systems offer a promising opportunity to address these challenges by supporting students in refining their mathematical argumentation within a tutorial setting. In this Research-in-Progress paper, we adopt a Design Science Research approach to generate design knowledge for an LLM-based tutoring tool aimed at fostering students’ argumentation skills. Drawing on user requirements and meta-requirements derived from user interviews and theoretical foundations, we derive four design principles and propose a prototype of a multi-agent LLM-based tutoring tool. The system delivers formative feedback on students’ proofs and provides tutorial guidance through step-by-step explanations, grounded in theories of formative feedback and tutorial guidance.
• When Trust Breaks: A Framework for Analyzing and Understanding Trust Violation and Repair in Sociotechnical Systems. Meywirth, Sophia; Janson, Andreas; Söllner, Matthias (2026).

  Trust violations in sociotechnical systems are becoming increasingly visible as AI systems take on advisory and decision-making roles in everyday life. When these systems fail, users must interpret what went wrong and decide whether to continue relying on them. Yet IS research has largely focused on trust formation, leaving the processes through which trust is broken, and potentially repaired, undertheorized. Meanwhile, adjacent fields have produced fragmented insights into trust violations and the mechanisms used to repair them. This paper presents a systematic literature synthesis of 62 studies to understand how trust violations and repair are conceptualized when technology plays a meaningful role. We identify four core stages that structure trust breakdown and recovery: the violation incident, the trustor sensemaking, the violator reaction, and the recalibrated trust outcome. We consolidate these insights into a process-oriented framework and guiding questions, outlining implications for human-AI collaboration and future IS research.
• What Factors Build User Trust in Human--Technology Relationships? An Exploratory Meta-Analysis of the Key Antecedents to Trust in IT Artifacts. Oesterreich, Thuy Duong; Anton, Eduard; Söllner, Matthias; Teuteberg, Frank (2026). 1–41.

  Purpose In response to various calls for more research extending our understanding of trust in IT artifacts, we synthesize the empirical evidence of prior studies in the rich stream of trust-related research to gain a more consistent picture regarding the role of trust antecedents in human–technology relationships. Design/methodology/approach We conduct an exploratory meta-analysis of 374 primary studies reported in 348 articles covering 26 years of trust research to gain deeper insights into the role of the antecedents to trust in IT artifacts. Our research framework combines 19 independent variables conceptualizing human- and system-like trusting beliefs, technology acceptance factors, system characteristics, user characteristics and contextual factors with perceived risk, trusting intention and trusting behavior as the dependent variables. Findings The findings confirm the pervasive role of the human- and system-like trusting beliefs ability/competence, benevolence, reliability and helpfulness as well as the technology acceptance factors perceived enjoyment and perceived usefulness in building trust and fostering trusting behavior. In addition, the findings indicate the importance of the system characteristics security and privacy in forming trust and helping users overcome the perceived degree of uncertainty on the way to fostering behavioral and continuous intention. Originality/value Based on the findings, we discuss the implications for research and practice, propose design recommendations for increasing trust in IT artifacts and provide future research avenues to explore. Considering that trust significantly influences IT adoption, our study's integrated perspective on trust is crucial for deepening our understanding of key factors in fostering trust between humans and technology.
• Fachliche und überfachliche Kompetenzen durch soziotechnisches Design von Systemen hybrider Intelligenz flexibel und individuell fördern: Projektergebnisse des Vorhabens Komp-HI im Rahmen der Richtlinie zur Bund-Länder-Initiative zur Förderung der Künstlichen Intelligenz in der Hochschulbildung Hänel, Martin; Weber, Florian K. F.; Link, Hendrik; Tolzin, Antonia; Knoth, Nils; Schulz, J.; Körner, A.; Janson, Andreas; Ebersbach, Mirjam; Hornung, Gerrit; Hetzler, H.; Rummer, Ralf; Leimeister, Jan Marco; Söllner, Matthias (2026).
• Design and Evaluation of an Adaptive Reading Support System for Comprehension. Hänel, Martin; Mwaita, Kevin Fred; Wambsganss, Thiemo; Söllner, Matthias (2026).

  Reading complex informational text is essential for comprehending global scientific knowledge, yet many nonnative readers from practice-oriented pathways struggle to comprehend such materials and require adaptive support that existing systems do not provide. However, past research lacks prescriptive design knowledge on how to effectively design such support systems. Hence, we present results from our design science research endeavor to design and evaluate an adaptive reading support system grounded in comprehension theory. We built on design principles and instantiated them as adaptive hints and support functions typically scattered across separate tools. We evaluated the systems in an online experiment with 84 participants across three conditions: control, conversational interface, and canvas interface. The results show that a conversational interface grounded in ICAP improves comprehension, while canvas-based instantiations of prior design principles require careful design to manage their higher interaction complexity, illustrating how system design grounded in linguistic theory can support the processing of complex texts. The study contributes design knowledge for effective comprehension support systems.
• PaperMate: A Prototype for Supporting Comprehension of Scientific Texts for Non Native Academic Readers. Hänel, Martin; Mwaita, Kevin Fred; Wambsganss, Thiemo; Söllner, Matthias in Lecture Notes in Computer Science (2026). (Vol. 16607) 337–344.

  Reading comprehension is essential for accessing scientific knowledge, yet many students, especially non native readers, struggle to understand complex academic texts. Comprehension theory shows that understanding requires the coordinated interaction of multiple subskills and the construction of a coherent situation model. Existing reading support systems typically address only isolated aspects such as summarization or simplification, resulting in superficial understanding. We present PaperMate, a canvas based reading support system designed to support situation model construction. Grounded in the Active Reader View, the artifact integrates simplification, structural guidance, essentialization, and contextual clarification within a unified and user controlled interface. This enables readers to flexibly combine support based on individual needs. The artifact was developed through multiple iterative design cycles including proof of concept, proof of value, laboratory studies, and field tests, and is continuously refined. The work demonstrates how holistic reading support can be operationalized in a concrete artifact and contributes to theory grounded design of reading support systems.
• Do Human Trust Models Transfer to AI? A Necessary Condition Analysis of Interpersonal Trust Antecedents in Large Language Model-Based Coaching. Meywirth, Sophia; Janson, Andreas; Söllner, Matthias (2026). 1–19.

  As large language models (LLMs) increasingly serve as a technology basis for conversational health behaviour interventions, understanding how users evaluate and respond to these systems becomes critical for their acceptance. When LLM-based coaches are anthropomorphically designed – e.g. through human names, avatars, and messaging interfaces – they may trigger interpersonal trust expectations traditionally reserved for human relationships. This study investigates whether and to what extent the interpersonal trust antecedents of ability, benevolence, and integrity influence trust-related user responses in LLM-based health coaching for fitness and nutrition. Using a vignette-based survey design and combining partial least-squares structural equation modelling (PLS-SEM) with necessary condition analysis (NCA), we identify which antecedents are essential for perceived usefulness and intention to adopt. Results show that integrity is a necessary condition for both outcomes, with a medium to large effect, and that ability significantly influences perceived usefulness but is not necessary. Benevolence, however, was found to be neither a necessary nor a significant predictor in this context. These findings offer theoretical insights into the selective transfer of interpersonal trustworthiness beliefs to AI and provide practical guidance for the design of trustworthy anthropomorphic coaching systems.
• What Does Pruning Actually Buy? Memory and Inference Time in Predictive Maintenance Models. Grillmeyer, Daniel; Turhal, Sükrü; Kounev, Samuel (2026).
• Immune responses following myocardial infarction in aged mice. Melika, Ebram Tharwat; Ashour, DiyaaElDin; Appel, Marc; Steder, Daphne; Arampatzi, Panagiota; Bischler, Thorsten; Popiolkowski, Lisa; Hofmann, Ulrich; Frantz, Stefan; Ramos, Gustavo Campos (2026).

  Aging is a major risk factor for cardiovascular diseases and is often accompanied by systemic alterations of the immune system, such as the accumulation of terminally differentiated T cells, clonal hematopoiesis of intermediate potential, and dysregulated production of pro-inflammatory cytokines. However, how the aging immune system impacts post-myocardial infarction (MI) repair remains poorly understood. In the present study, we compared the post-MI inflammatory responses in 2- and 18-month-old C57BL/6 J mice of both sexes and monitored the distribution of interferon-gamma (IFN-γ) producing cells in these conditions using Ifng-YFP reporter mice. Our results show a conserved IFN-γ production signature both in mice and humans during physiological aging. In mice, the aging myocardium exhibited increased pro-inflammatory gene expression signature with increased recruitment of IFN-γ-expressing T cells following MI. Moreover, while this age-related inflammation had little impact in the acute post-MI responses, a persistent IFN-γ-production signature observed in elderly mice was associated with an aggravation of chronic adverse cardiac remodeling. Taken together, our results indicate that age-related smoldering inflammation may fuel the long-term progression of ischemic heart failure.
• What Does Pruning Actually Buy? Memory and Inference Time in Predictive Maintenance Models. Grillmeyer, Daniel; Turhal, Sükrü; Kounev, Samuel (2026).
• The Hybrid Intelligence Manifesto: A Multi-Level Socio-Technical Framework for Keeping Human Judgement Economically Valuable. Sherson, Jacob Friis; Rafner, Janet; Bang, Jesper Broberg; Berditchevskaia, Aleksandra; Bjerring, Jens Christian; Chompunuch, Sudapa; Daga, Enrico; Dellermann, Dominik; Domanti, Umberto; Emruli, Blerim; von Harmelen, Frank; Gonzalez, Maceo; Gordon, Adam; Green, Adam; Hansen, Rigmor Lyck; Holm, Anna B.; Jonker, Catholijn; Järvelä, Sanna; Kenett, Yoed N.; Kjeldsen, Frederik Brosbøl; Knudsen, Mette P.; Largacha-Martinez, Carlos; Lebuda, Izabela; Linnet, Rasmus; Lodefalk, Magnus; Mao, Yaoli; Marler, Janet; Meyer-Vitali, André; Natali, Chiara; Olsen, Morten Røndal; Rahimi, Seyedahmad; Reicherts, Leon; Reiter-Palmon, Roni; Sauermann, Henry; Sent, Danielle; Schmid, Thomas; Söllner, Matthias; Elpelt, Jonas; Tan, Stephanie; Thylkjær, Casper; Tiddi, Ilaria; Tudoran, Ana Alina; Wagner, Marcus; Bozorgtabar, Behzad; Catalan, Carlos Rafael; Kajtazi, Miranda; Norkin, Svetlana; Gkoumas, Christos; Vistisen, Peter; Staegemann, Daniel; Wiewiura, Joachim; Filipova, Mariana; Lindström, Adam Dahlgren; Ivcevic, Zorana; von Felten, Nick; Zhang, Zelun Tony; Tankelevitch, Lev; Vinchon, Florent; Szöllösi, Bianka; Molina-Abril, Ginés (2026).

  The rapid emergence of increasingly agentic AI systems poses a structural challenge to the future of meaningful human work. As AI expands from task automation to autonomous goal pursuit, preserving human agency can no longer rely on ethical guidelines alone. This manifesto advances Hybrid Intelligence (HI) as a multi-level socio-technical transformation model aimed at keeping human judgment economically indispensable, by developing human–AI workflows that outperform pure automation across a broad range of applications. Headline results in which AI alone beats AI-assisted professionals test automation against unscaffolded oversight rather than against hybrid intelligence; the decisive comparison has yet to be run, and this collection builds the apparatus to run it. Drawing on more than fifty interdisciplinary roundtables and two foresight workshops, we, the HI Manifesto consortium of major European HI research centers and 60 scholars and AI practitioners, articulate an urgent mission: to design interfaces, governance frameworks, institutional policies, and market mechanisms such that human value creation scales through competitive human–AI collaboration rather than displacement. This does not require humans to approve every AI output; it requires that human contextual judgment be structurally embedded in value-creating workflows, irreducible to symbolic oversight, and that such workflows constitute the majority rather than a fringe of the future economy. We reinterpret complementarity as a dynamic frontier between prediction and judgment that shifts as contextual knowledge becomes machine-operational and that must be actively managed through deliberate workflow design. On this foundation we contribute: (1) a durable, knowledge-structure-grounded definition of complementarity with operational classification tests; (2) prescriptive multi-level HI definitions distilled from ten consensus criteria and constructed as exclusion instruments against HI-washing, with qualified terms spanning interface, practice, organization, and society; (3) a six-level interface classification from autonomous AI to collaborative HI; (4) a five-dimensional use-case maturity matrix applied to iconic and partner cases, revealing distinct HI business-model patterns; and (5) a foresight analysis of four AI futures identifying the transition's drivers and its valley of death. Four companion papers and a cross-cutting interaction framework (FERC) operationalize the interface, organizational, macroeconomic, and educational levels, including first field results showing the framework is buildable by ordinary commercial teams. We conjecture that granular hybrid workflows can reduce dependence on frontier-scale compute, with competitiveness, sustainability, and sovereignty as the dividend, and we close by extending the program into a constellation of Hybrid Intelligence Missions with concrete institutional calls to action. HI thus emerges not as a tool choice but as a systemic design paradigm for safeguarding meaningful work and human agency in the age of agentic AI.
• Introduction to the Minitrack on Collaboration with Intelligent Systems: Machines as Teammates. Seeber, Isabella; Elson, Joel S.; Söllner, Matthias; Mullins, Ryan (2025). 1–3.
• A Case Study on the Value of Simulated and Synthetic Microservice Applications for Performance Model Training. Lubas, Yannik; Straesser, Martin; Rohwer, Ivo; Bauer, André; Kounev, Samuel A. Herrmann (ed.) (2025). (Vol. 45) 35–37.

  Microservices have become a central architectural style for cloud-based systems, driving increased interest in their performance characteristics. However, the limited availability of real-world microservice applications for academic research constrains empirical studies in this area, particularly those using application-agnostic, machine learning-based approaches. Prior work has explored synthetic generation and simulation as alternative means of obtaining performance data; however, their benefits when used alongside real-world measurements are less understood. Using the saturation predictor Monitorless in a case study, we evaluate two scenarios. Our results indicate that generated and simulated applications improve predictive performance on previously unseen, real-world systems. In our case, generated applications reduced false positives, simulated applications enhanced robustness, while their combination yielded the most balanced predictor. The findings suggest that synthetic and simulated applications can effectively complement real-world data, enabling more diverse and robust evaluation of performance models.
• A Case Study on the Value of Simulated and Synthetic Microservice Applications for Performance Model Training. Lubas, Yannik; Straesser, Martin; Rohwer, Ivo; Bauer, André; Kounev, Samuel A. Herrmann (ed.) (2025). (Vol. 45) 35–37.

  Microservices have become a central architectural style for cloud-based systems, driving increased interest in their performance characteristics. However, the limited availability of real-world microservice applications for academic research constrains empirical studies in this area, particularly those using application-agnostic, machine learning-based approaches. Prior work has explored synthetic generation and simulation as alternative means of obtaining performance data; however, their benefits when used alongside real-world measurements are less understood. Using the saturation predictor Monitorless in a case study, we evaluate two scenarios. Our results indicate that generated and simulated applications improve predictive performance on previously unseen, real-world systems. In our case, generated applications reduced false positives, simulated applications enhanced robustness, while their combination yielded the most balanced predictor. The findings suggest that synthetic and simulated applications can effectively complement real-world data, enabling more diverse and robust evaluation of performance models.
• A Case Study on the Value of Simulated and Synthetic Microservice Applications for Performance Model Training. Lubas, Yannik; Straesser, Martin; Rohwer, Ivo; Bauer, André; Kounev, Samuel A. Herrmann (ed.) (2025). (Vol. 45) 35–37.

  Microservices have become a central architectural style for cloud-based systems, driving increased interest in their performance characteristics. However, the limited availability of real-world microservice applications for academic research constrains empirical studies in this area, particularly those using application-agnostic, machine learning-based approaches. Prior work has explored synthetic generation and simulation as alternative means of obtaining performance data; however, their benefits when used alongside real-world measurements are less understood. Using the saturation predictor Monitorless in a case study, we evaluate two scenarios. Our results indicate that generated and simulated applications improve predictive performance on previously unseen, real-world systems. In our case, generated applications reduced false positives, simulated applications enhanced robustness, while their combination yielded the most balanced predictor. The findings suggest that synthetic and simulated applications can effectively complement real-world data, enabling more diverse and robust evaluation of performance models.
• A Case Study on the Value of Simulated and Synthetic Microservice Applications for Performance Model Training. Lubas, Yannik; Straesser, Martin; Rohwer, Ivo; Bauer, André; Kounev, Samuel A. Herrmann (ed.) (2025). (Vol. 45) 35–37.

  Microservices have become a central architectural style for cloud-based systems, driving increased interest in their performance characteristics. However, the limited availability of real-world microservice applications for academic research constrains empirical studies in this area, particularly those using application-agnostic, machine learning-based approaches. Prior work has explored synthetic generation and simulation as alternative means of obtaining performance data; however, their benefits when used alongside real-world measurements are less understood. Using the saturation predictor Monitorless in a case study, we evaluate two scenarios. Our results indicate that generated and simulated applications improve predictive performance on previously unseen, real-world systems. In our case, generated applications reduced false positives, simulated applications enhanced robustness, while their combination yielded the most balanced predictor. The findings suggest that synthetic and simulated applications can effectively complement real-world data, enabling more diverse and robust evaluation of performance models.
• A Case Study on the Value of Simulated and Synthetic Microservice Applications for Performance Model Training. Lubas, Yannik; Straesser, Martin; Rohwer, Ivo; Bauer, André; Kounev, Samuel A. Herrmann (ed.) (2025). (Vol. 45) 35–37.

  Microservices have become a central architectural style for cloud-based systems, driving increased interest in their performance characteristics. However, the limited availability of real-world microservice applications for academic research constrains empirical studies in this area, particularly those using application-agnostic, machine learning-based approaches. Prior work has explored synthetic generation and simulation as alternative means of obtaining performance data; however, their benefits when used alongside real-world measurements are less understood. Using the saturation predictor Monitorless in a case study, we evaluate two scenarios. Our results indicate that generated and simulated applications improve predictive performance on previously unseen, real-world systems. In our case, generated applications reduced false positives, simulated applications enhanced robustness, while their combination yielded the most balanced predictor. The findings suggest that synthetic and simulated applications can effectively complement real-world data, enabling more diverse and robust evaluation of performance models.
• A Case Study on the Value of Simulated and Synthetic Microservice Applications for Performance Model Training. Lubas, Yannik; Straesser, Martin; Rohwer, Ivo; Bauer, André; Kounev, Samuel A. Herrmann (ed.) (2025). (Vol. 45) 35–37.

  Microservices have become a central architectural style for cloud-based systems, driving increased interest in their performance characteristics. However, the limited availability of real-world microservice applications for academic research constrains empirical studies in this area, particularly those using application-agnostic, machine learning-based approaches. Prior work has explored synthetic generation and simulation as alternative means of obtaining performance data; however, their benefits when used alongside real-world measurements are less understood. Using the saturation predictor Monitorless in a case study, we evaluate two scenarios. Our results indicate that generated and simulated applications improve predictive performance on previously unseen, real-world systems. In our case, generated applications reduced false positives, simulated applications enhanced robustness, while their combination yielded the most balanced predictor. The findings suggest that synthetic and simulated applications can effectively complement real-world data, enabling more diverse and robust evaluation of performance models.
• LEAST SQUARE CHANNEL ESTIMATION FOR IMAGE TRANSMISSION WITH OFDM OVER FADING CHANNEL. S.M, Usha; H.B, Mahesh (2020). International Journal of Computer Networks & Communications (IJCNC)(12) 1.

  Wireless communication is the most effective communication to convey audio or video information among the population. It enables the masses to connect throughout the world. Wireless technologies improve the lifestyle of individuals in rural and poor communication areas. In this view, the quality of a reliable signal can be enhanced by minimizing carrier interference. In this paper bit error rate of an image, signal is transmitted over fading channel is analyzed using orthogonal frequency multiplexing and channel estimation technique. An Orthogonal Frequency Multiplexing (OFDM) provides prominent bandwidth effectiveness and improved immunity to the fading environments. In OFDM, the data is modulated using multiple numbers of subcarriers that are orthogonal to each other. A cyclic prefix is infixed between OFDM symbols to annihilate the inter symbol interference (ISI) and inter-carrier interference (ICI). The least square channel estimation method is used to minimize the effect of multipath fading. An image, signal is modulated using BPSK, QPSK, 16QAM and 64QAM digital modulation schemes with OFDM and channel estimation and transmitted over AWGN and fading channel. The objective of this work is to improve the signal to noise ratio by reducing interference. The bit error rate vs. signal to noise ratio for BPSK, QPSK, 16QAM and 64QAM without channel estimation at 5dB is 0.4948, 0.4987, 0.4965 and 0.4983 and with channel estimation is 0.099, 0.2600, 0.3900 and 0.4300 respectively. The bit error rate obtained with BPSK, QPSK, 16QAM and 64QAM without channel estimation at SNR of 10dB is 0.4964, 0.4985, 0.4957 and 0.4982 and with channel estimation is 0.033, 0.19, 0.34 and 0.38 respectively. The bit error rate obtained with BPSK, QPSK, 16QAM and 64QAM without channel estimation at SNR of 15dB is 0.4938, 0.4985, 0.4953 and 0.4979 and with channel estimation is 0.0072, 0.1900, 0.3241 and 0.3762 respectively. The error rate is minimized with channel estimation. The error rate increases with the order of modulation and it is noticed that the error rate is minimum with the BPSK modulator and is maximum with 64QAM.
• How history crosses the threshold of the domestic sphere – persistence and change within Khwe residential units in West Caprivi. Boden, Gertrud O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 190–193.
• Economic trends and coping strategies in the history of European farming in northern central Namibia. Dieckmann, Ute O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 166–169.
• Caravan routes – discovered with satellite eyes. Skriwanek, Jan O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 136–137.
• 100 years of Etosha – an issue of people and parks. Dieckmann, Ute O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 124–127.
• High resolution satellite images and Differential GPS in geomorphological and geoarchaeological research on Boni Island (Fourth Nile Cataract, north Sudan). Ritter, Mathias; Diehl, Tobias O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 92–95.
• Watershed analysis in the Western Desert of Egypt. Bolten, Andreas; Bubenzer, Olaf O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 22–23.
• Inheritance and maintenance among the Himba of the Kunene region. Bollig, Michael O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 198–201.
• Boreholes – the dynamics of pastoralism in northwestern Namibia. Bollig, Michael O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 170–173.
• Holocene climatic change, human adaptation and landscape degradation in arid Africa as evidenced by the faunal record. Pöllath, Nadja; Peters, Joris O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 64–67.
• Mapping the movement of pastro-foragers: the spread of Desert Glass and other objects in the eastern Sahara during the Holocene ‘humid phase’. Riemer, Heiko O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 30–33.
• From space to earth – use of satellite data in ACACIA. Bolten, Andreas O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 20–21.
• Wadi Howar National Park. Kröpelin, Stefan; Oehm, Sven O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 122–123.
• Reconnaissance of the Erdi Ma (northeast Chad). Kröpelin, Stefan O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 58–59.
• Natural resource management in a conservancy in northern Namibia. Zieß, Bettina O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 108–109.
• Dunes and megadunes in the southern Namib Erg and the southern Great Sand Sea – a transcontinental comparison. Besler, Helga; Bödeker, Oliver; Bubenzer, Olaf O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 60–63.
• Desert parks in the eastern Sahara. Kuper, Rudolph O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 118–121.
• From hyperarid to semiarid – actual climatic conditions in northeastern and southwestern Africa. Bubenzer, Olaf; Ritter, Mathias O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 18–19.
• Folktales as a source of investigation of cultural diffusion in Namibia and southern Angola. Seifert, Marc O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 154–157.
• Biomass production and seasonal ecologic behaviour based on a remote sensing modelling approach. Richters, Jochen O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 86–87.
• Vegetation mapping for the evaluation of traditional land use and conservation activities in the northern Richtersveld, Namaqualand (South Africa). Nussbaum, Stefanie; Darius, Frank O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 82–85.
• The long journey – aspects of labour migration in Kunene South. Greiner, Clemens O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 142–143.
• Rocky islands within oceans of sand – archaeology of the Jebel Ouenat / Gilf Kebir region, eastern Sahara. Linstädter, Jörg O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 34–37.
• The Wadi Howar. Kröpelin, Stefan O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 38–39.
• Inequalities inscribed in landscape. Schnegg, Michael; Welle, Torsten O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 100–103.
• Bibliography and further readings, Photo credits, Satellite-image maps, List of abbreviations, Authors’ addresses. Bubenzer, Olaf; Bolten, Andreas; Darius, Frank O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 202–239.
• ‘Going to greet the relatives’ – household economy, mobility and politics in Dar Zaghawa, NE-Chad. Jungstand, Grit O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 174–177.
• ACACIA – central administration and coordination. Schuck, Werner O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 12–15.
• High-resolution climate archives in the Sahara (Ounianga, Chad). Kröpelin, Stefan O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 56–57.
• Landscape and logistics – the success of Ancient Egypt. Herb, Michael O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 96–99.
• Foreword. Bubenzer, Olaf; Bolten, Andreas; Darius, Frank O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 5.
• Spectral analysis of remote sensing data for geomorphological, geological and geoecological research in arid Africa. Waldhoff, Guido O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 90–91.
• Environmental change and cultural history in northeastern and southwestern Africa. Kuper, Rudolph; Möhlig, Wilhelm; Bollig, Michael; Bubenzer, Olaf O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 8–11.
• Ennedi Highlands, Chad – artists and herders in a lifeworld on the margins. Lenssen-Erz, Tilman O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 50–53.
• In search of the bloom – plants as witnesses to the humid past. Darius, Frank; Nussbaum, Stefanie O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 78–81.
• The Abu Ballas Trail: a Pharaonic donkey-caravan route in the Libyan Desert (SW-Egypt). Förster, Frank O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 130–133.
• Climate, relief, bedrock and substrate – main factors for the soil formation in arid regions. Bubenzer, Olaf; Bolten, Andreas O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 76–77.
• Namibian languages. Möhlig, Wilhelm; Seidel, Frank O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 146–147.
• The European agricultural appropriation of the Outjo district in northern central Namibia. Dieckmann, Ute O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 162–165.
• The Saharan lakes of Ounianga Serir – a unique hydrological system. Kröpelin, Stefan O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 54–55.
• Mobile oases in the Libyan Desert. Meerpohl, Meike O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 138–141.
• Holocene settlement dynamics in the Wadi Howar region (Sudan) and the Ennedi Mountains (Chad). Jesse, Friederike; Keding, Birgit O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 42–43.
• Settlement patterns in a risky environment – Tama villages in northeastern Chad. Janszky, Babett O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 178–181.
• Djara – humans and their environment on the Egyptian limestone plateau around 8,000 years ago. Kindermann, Karin; Bubenzer, Olaf O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 26–29.
• Mapping culture, representing boundaries and politicising difference – reflections on two San cases in Namibia. Boden, Gertrud O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 112–115.
• Adaptation strategies on a local scale in the context of Global Change?. Welle, Torsten O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 110–111.
• The Wadi Howar diaspora – linking linguistic diffusion to palaeoclimatological and archaeological findings. Dimmendaal, Gerrit O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 148–149.
• Cattle herding in the southern Libyan Desert. Jesse, Friederike; Keding, Birgit; Pöllath, Nadja; Bechhaus-Gerst, Marianne; Lenssen-Erz, Tilman O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 46–49.
• Brandberg/Daureb, Namibia – painters of a prehistoric hunter-gatherer world. Lenssen-Erz, Tilman O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 72–73.
• ‘We can count on us’ – the stability of households in the Richtersveld, South Africa. Berzborn, Susanne O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 182–185.
• Gendered space – female headed households in Fransfontein, northwest Namibia. Pauli, Julia O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 186–189.
• Transformations of settlement patterns in the Middle Wadi Howar during the Holocene. Keding, Birgit; Eisenhauer, Ursula O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 44–45.
• Sharing space and food in Namibia. Schnegg, Michael; Bolten, Andreas O. Bubenzer, A. Bolten, F. Darius (eds.) (2007). 194–197.