cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Feedback Between Motion and Sensation Provides Nonlinear Boost in Run-and-tumble Navigation
Creators: name: Long, Junjiajia
name: Zucker, Steven W.
name: Emonet, Thierry
Publisher: name: arXiv
Year: 2016
Subjects: subject: Cell Behavior (q-bio.CB)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: Many organisms navigate gradients by alternating straight motions (runs) with random reorientations (tumbles), transiently suppressing tumbles whenever attractant signal increases. This induces a functional coupling between movement and sensation, since tumbling probability is controlled by the internal state of the organism which, in turn, depends on previous signal levels. Although a negative feedback tends to maintain this internal state close to adapted levels, positive feedback can arise when motion up the gradient reduces tumbling probability, further boosting drift up the gradient. Importantly, such positive feedback can drive large fluctuations in the internal state, complicating analytical approaches. Previous studies focused on what happens when the negative feedback dominates the dynamics. By contrast, we show here that there is a large portion of physiologically-relevant parameter space where the positive feedback can dominate, even when gradients are relatively shallow. We demonstrate how large transients emerge because of non-normal dynamics (non-orthogonal eigenvectors near a stable fixed point) inherent in the positive feedback, and further identify a fundamental nonlinearity that strongly amplifies their effect. Most importantly, this amplification is asymmetric, elongating runs in favorable directions and abbreviating others. The result is a "ratchet-like" gradient climbing behavior with drift speeds that can approach half the maximum run speed of the organism. Our results thus show that the classical drawback of run-and-tumble navigation --- wasteful runs in the wrong direction --- can be mitigated by exploiting the non-normal dynamics implicit in the run-and-tumble strategy.
description: 22 pages, 3 figures, and 8 pages of SI
Ultrasonically Tinned PVD Al Rear Contacts on High-Efficiency Crystalline Silicon Solar Cells for Module Integration
Creators: name: Nagel, H.
name: Eberlein, D.
name: Hoffmann, S.
name: Graf, M.
name: Steinhauser, B.
name: Feldmann, F.
name: Kraft, A.
name: Eitner, U.
name: Glatthaar, M.
name: Hermle, M.
name: Glunz, S.W.
name: Haverkamp, H.
name: Fischer, T.
name: Hain, A.
name: Wohlfart, P.
name: Mertens, V.
name: Müller, J.M.
name: Buck, T.
Publisher: name: WIP
Year: 2017
Subjects: Silicon Photovoltaics
Manufacturing & Production

description: 33rd European Photovoltaic Solar Energy Conference and Exhibition; 295-299
description: We investigated ultrasonic tinning of physical vapor deposited (PVD) Al rear contacts on p-type
passivated emitter and rear cells and n-type back junction cells, respectively. By means of electroluminescence
(EL) imaging after ultrasonic tinning we identified small local damage of the cells’ rear side passivation only at the
positions where the soldering irons were initially placed on the Al. Though measured interconnector peel force was
< 1 N/mm and hence lower then required by the standard DIN EN 50461, we obtained power degradation < 5 %
after 400 thermal cycles, 2000 h in damp heat test and 20 cycles in the humidity freeze test, respectively, which is
double the load demanded by the IEC 61215 standard. EL images revealed no local degradation induced by the
climate tests. The microstructure of the tinned PVD Al is investigated by secondary electron microscopy and
energy dispersive X-ray spectroscopy.
Optimal whitening and decorrelation
Creators: name: Kessy, Agnan
name: Lewin, Alex
name: Strimmer, Korbinian
Publisher: name: arXiv
Year: 2015
Subjects: subject: Methodology (stat.ME)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: Whitening, or sphering, is a common preprocessing step in statistical analysis to transform random variables to orthogonality. However, due to rotational freedom there are infinitely many possible whitening procedures. Consequently, there is a diverse range of sphering methods in use, for example based on principal component analysis (PCA), Cholesky matrix decomposition and zero-phase component analysis (ZCA), among others. Here we provide an overview of the underlying theory and discuss five natural whitening procedures. Subsequently, we demonstrate that investigating the cross-covariance and the cross-correlation matrix between sphered and original variables allows to break the rotational invariance and to identify optimal whitening transformations. As a result we recommend two particular approaches: ZCA-cor whitening to produce sphered variables that are maximally similar to the original variables, and PCA-cor whitening to obtain sphered variables that maximally compress the original variables.
description: 14 pages, 2 tables
Trump’s Aesthetic, Spatial and Architectural Dramalities
Creators: name: Suma, Sophie
Publisher: name: FOOTPRINT
Year: 2022

description: This article hypothesises that while drama is primarily a television genre, its operation also appears in the way Trump mediates his political activities. By observing some of the media objects and events staged by Trump, such as his escalator descents from Trump Tower, the popularisation of Trump’s Border Wall, the attempt to institutionalise the executive order entitled ‘Making Federal Buildings Beautiful Again’, and the transgression of national symbolic spaces embodied by the 4 July 2019 show at the Lincoln Memorial in Washington, DC, it will be a matter of questioning the architectural politics conducted by Trump. Then to see in what way the Trumpian dramatisation participates in a populist architectural strategy.
description: FOOTPRINT, Vol. 15 No. 2 (2021): Issue # 29 | Autumn/ Winter 2021 |The Architecture of Populism: Media, Politics and Aesthetics
Highly Reliable Low Concentration InGaP/GaAs/Si 3-Junction Solar Cells with Smart Stack Technology
Creators: name: Makita, K.
name: Mizuno, H.
name: Oshima, R.
name: Tayagaki, T.
name: Baba, M.
name: Yamada, N.
name: Takato, H.
name: Sugaya, T.
Publisher: name: WIP
Year: 2017
Subjects: New Materials and Concepts for Photovoltaic Devices
New Materials and Concepts for Cells and Modules

description: 33rd European Photovoltaic Solar Energy Conference and Exhibition; 27-29
description: Low concentration multi-junction (MJ) solar cells have a practical solution to consist with high efficiency and low cost. We have demonstrated a low concentration InGaP/GaAs/Si 3-junction solar cell with mechanical stacking method. In this development, our key technology is the direct bonding using conductive
nanoparticle alignment, which is named “Smart Stack” technology. Using this technology, we fabricated an InGaP/GaAs/Si 3-junction solar cell and observed the maximum efficiency of 23.74% at 8.0 suns (AM1.5g). In addition, we discuss the reliability of InGaP/GaAs/Si 3-junction solar cells showing the results of accelerated aging test and thermal cycling test. It was confirmed that our solar cells have high long-term reliability under sever
conditions. Appling general lifetime estimation method with Arrhenius plot, the life time under 10 suns was estimated to be more than 1.5×105 hours at 60. These results strongly suggested the high potential of our Smart Stack technology to achieve low cost and highly reliable mechanically stacked MJ solar cells for practical use.
The shallow shell approach to Pogorelov's problem and the breakdown of `mirror buckling'
Creators: name: Gomez, Michael
name: Moulton, Derek E.
name: Vella, Dominic
Publisher: name: arXiv
Year: 2016
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We present a detailed asymptotic analysis of the point indentation of an unpressurized, spherical elastic shell. Previous analyses of this classic problem have assumed that for sufficiently large indentation depths, such a shell deforms by `mirror buckling' --- a portion of the shell inverts to become a spherical cap with equal but opposite curvature to the undeformed shell. The energy of deformation is then localized in a ridge in which the deformed and undeformed portions of the shell join together, commonly referred to as Pogorelov's ridge. Rather than using an energy formulation, we revisit this problem from the point of view of the shallow shell equations and perform an asymptotic analysis that exploits the largeness of the indentation depth. This reveals first that the stress profile associated with mirror buckling is singular as the indenter is approached. This consequence of point indentation means that mirror buckling must be modified to incorporate the shell's bending stiffness close to the indenter and gives rise to an intricate asymptotic structure with seven different spatial regions. This is in contrast with the three regions (mirror-buckled, ridge and undeformed) that are usually assumed and yields new insight into the large compressive hoop stress that ultimately causes the shell to buckle azimuthally.
description: 27 pages, 8 figures
Dynamical conductivity of disordered quantum chains
Creators: name: Takayoshi, Shintaro
name: Giamarchi, Thierry
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study the transport properties of a one dimensional quantum system with disorder. We numerically compute the frequency dependence of the conductivity of a fermionic chain with nearest neighbor interaction and a random chemical potential by using the Chebyshev matrix product state (CheMPS) method. As a benchmark, we investigate the noninteracting case first. Comparison with exact diagonalization and analytical solutions demonstrates that the results of CheMPS are reliable over a wide range of frequencies. We then calculate the dynamical conductivity spectra of the interacting system for various values of the interaction and disorder strengths. In the high frequency regime, the conductivity decays as a power law, with an interaction dependent exponent. This behavior is qualitatively consistent with the bosonized field theory predictions, although the numerical evaluation of the exponent shows deviations from the analytically expected values. We also compute the characteristic pinning frequency at which a peak in the conductivity appears. We confirm that it is directly related to the inverse of the localization length, even in the interacting case. We demonstrate that the localization length follows a power law of the disorder strength with an exponent dependent on the interaction, and find good quantitative agreement with the field theory predictions. In the low frequency regime, we find a behavior consistent with the one of the noninteracting system $ω^{2}(\lnω)^{2}$ independently of the interaction. We discuss the consequences of our finding for experiments in cold atomic gases.
description: 10 pages, 7 figures
Virtues of Proximity
Creators: name: Cuéllar, Gabriel
name: Mufreh, Athar
Publisher: name: FOOTPRINT
Year: 2022

description: Whereas real estate-driven development tends to invest in singular and concentrated sites, resident-led development thrives in scattered patterns. The properties of community land trusts (CLTs) — one of the foremost models of resident-led development whereby land is claimed and used by a community without landlords — are almost always dispersed in a context where every property line is a potential obstacle to development. What these populist landholdings lack in terms of economy of scale is compensated for by virtues of proximity. This article examines the historic phenomena of property scattering and spatial patterns of CLTs across the US, articulating the possibility of designing patterns of scattered landholdings that support the values of resident-led development.
description: FOOTPRINT, Vol. 15 No. 2 (2021): Issue # 29 | Autumn/ Winter 2021 |The Architecture of Populism: Media, Politics and Aesthetics
Call and Response
Creators: name: Honsa, Jesse Foster
Publisher: name: FOOTPRINT
Year: 2022

description: A "housing crisis" is often naively understood as a simple market imbalance between supply and demand, frequently occurring within cities in a capitalist mode of development. If that were the case, the solution would be to simply open the pipes and build more houses, a regulatory action delegated to technocrats. But as Reinhardt Koselleck reveals, crisis is a concept constructed by special interest groups with the aim of challenging absolute power, enlarging a sphere of popular criticism towards business-as-usual. This paper considers the operative nature of 'housing crisis' and related terms by investigating their use as a tool for urban reform in the 19th and 20th centuries in London. In newspaper articles, think tank publications and government reports, criticism often took on qualitative dimensions, leveraging change to housing practices. Crisis itself has had different meanings, from a moral apocalypse to a political risk to an historic opportunity. This is in contrast to how the term is used today, where it is no longer a climactic moment of decision and relief, but a perpetual and seemingly unsurmountable condition. While London's housing crisis is today universally accepted according to experts' statistics, it is rarely addressed on popular aesthetic grounds.
description: FOOTPRINT, Vol. 15 No. 2 (2021): Issue # 29 | Autumn/ Winter 2021 |The Architecture of Populism: Media, Politics and Aesthetics
Begriffene Welt und das (verborgene) Wissen um und über Räume
Creators: name: Leipold, Ralf
Publisher: name: Freie Universität Berlin
Year: 2015
Subjects: subject: Raum
subject: Wissen
subject: Sozialgeographie
subject: Erinnerung
subject: Bibliothek
subject: Heterotopie
subject: Space
subject: knowledge
subject: 900 Geschichte und Geografie::930 Geschichte des Altertums (bis ca. 499), Archäologie

description: Seit dem von geographischer Seite in den 1980er-Jahren angestoßenen spatial turn ist der Terminus ,Raum‘ nicht mehr von der Agenda der Sozial-, Kultur- und Geisteswissenschaften wegzudenken. Ein Beleg dafür sind die zahlreichen Begriffskoalitionen, die ,Raum‘ bis heute eingegangen ist. Raum-Wissen scheint hierbei ein zunehmend prominenteres Bündnis abzugeben. Dabei ist die theoretische Sättigung der gegenseitigen Verwiesenheit aufeinander noch weitestgehend unklar. Die Unklarheit berührt vor allem die Frage nach der angemessenen Integration von ,Raum‘ in die wissenschaftstheoretische Diskussion. Der folgende Beitrag versucht diese Problemlage zu thematisieren, indem eine sozialgeographische Forschungsperspektive eingenommen wird, die das Verhältnis von Raum und Wissen praxisorientiert wie kritisch-reflexiv betrachtet. Der Zweiseitigkeit des Raum-Wissen-Nexus folgend, wird zu zeigen sein, inwieweit sprachlich oder visuell geformtes Wissen über Räume einen analytischen Zugang zu (antiken) Weltsichten eröffnet. Zudem rücken mit anderer Schwerpunktsetzung auf Wissen um Räume bestimmte Orte der Aufbewahrung und Überlieferung von Wissen, wie Bibliotheken, in den Mittelpunkt der Betrachtung.
description: Since the advent of the spatial turn, initiated by geographers in the 1980s, the social and cultural sciences and the humanities cannot be conceived of without the term space. The numerous word-creations with space are just one example of this fact. ‘Space-knowledge’ seems to have increasing prominence in these alliances even though the theoretical foundations for the reciprocal reference are not yet completely evident. This lack of evidence poses the question of how to adequately integrate space into theoretical discussions. This paper endeavours to discuss this problem by following a social-geographic perspective which examines the relation between space and knowledge from a critical reflective as well as from a practice-oriented point of view. By following the two-sidedness of the nexus between space and knowledge, it will be shown to what extent orally or visually formed knowledge about space offers analytical access to (ancient) worldviews. Moreover, the focus on knowledge of space brings specific places of conservation and transmission of knowledge, such as libraries, into the centre of the examination.
Exploring the ferromagnetic behaviour of a repulsive Fermi gas via spin dynamics
Creators: name: Valtolina, G.
name: Scazza, F.
name: Amico, A.
name: Burchianti, A.
name: Recati, A.
name: Enss, T.
name: Inguscio, M.
name: Zaccanti, M.
name: Roati, G.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Ferromagnetism is a manifestation of strong repulsive interactions between itinerant fermions in condensed matter. Whether short-ranged repulsion alone is sufficient to stabilize ferromagnetic correlations in the absence of other effects, like peculiar band dispersions or orbital couplings, is however unclear. Here, we investigate ferromagnetism in the minimal framework of an ultracold Fermi gas with short-range repulsive interactions tuned via a Feshbach resonance. While fermion pairing characterises the ground state, our experiments provide signatures suggestive of a metastable Stoner-like ferromagnetic phase supported by strong repulsion in excited scattering states. We probe the collective spin response of a two-spin mixture engineered in a magnetic domain-wall-like configuration, and reveal a substantial increase of spin susceptibility while approaching a critical repulsion strength. Beyond this value, we observe the emergence of a time-window of domain immiscibility, indicating the metastability of the initial ferromagnetic state. Our findings establish an important connection between dynamical and equilibrium properties of strongly-correlated Fermi gases, pointing to the existence of a ferromagnetic instability.
description: 8 + 17 pages, 4 + 8 figures, 44 + 19 references
title: Changing Commerce and Merchant Power in the Indian Ocean
title: Impacts on Afro-Asian ‘Core’ and ‘Peripheral’ Polities, ca. 300 BCE to 1800 CE
titleType: Subtitle
Creators: name: Oka, Rahul
name: Kusimba, Chapurukha M.
name: Enverova, Deniz
name: Gogte, Viswas D.
name: Dandekar, Abhijit
Publisher: name: Freie Universität Berlin
Year: 2020
Subjects: subject: maritime trade
subject: commerce
subject: Indian Ocean
subject: closure
subject: brokerage
subject: Trader Alliance Networks (TAN)
subject: 900 Geschichte und Geografie::930 Geschichte des Altertums (bis ca. 499), Archäologie::930 Geschichte des Altertums bis ca. 499, Archäologie

description: Between 300 BCE and 1800 CE, Indian Ocean commerce was managed by traders who bridged exchange networks across the edges and peripheries of empires and interaction spheres through trader alliance networks (TAN). Using Network Theory, we hypothesize that TAN were characterized by high Triadic Closure and relatively little political influence between 300 BCE–1400 CE, and shifted to Brokerage and high political influence after 1400 CE. These shifts and their impacts are tested through archaeological data from the Indian Ocean ports of Chaul, India, and Mtwapa, Kenya. These shifts enable understanding the emergence and impact of trader lobbies, pressure groups, and ‘Great Firms’ as global power brokers, and the rise of Predatory Commerce after 1600 CE that continues to this date.
Colored Solar Modules Using Integrated Pixelated Resonant Dielectric Nanoscatterer Arrays
Creators: name: Neder, V.
name: Luxembourg, S.L.
name: Polman, A.
Publisher: name: WIP
Year: 2017
Subjects: New Materials and Concepts for Photovoltaic Devices
Fundamental Studies

description: 33rd European Photovoltaic Solar Energy Conference and Exhibition; 34-37
description: Green colored photovoltaic modules based on silicon heterojunction solar cells integrated with periodic arrays of light scattering Si nanoscatterers were made. Here, we expand this concept to multiple colors and color combinations. We show that random arrays of silicon nanoarrays can be combined to pixels to create the desired color. By adjusting the coverage of pixels composed of different nanoparticle arrays different colors can be designed and the calculated chromaticity values can be obtained from the fabricated sample. The pixelated nanoscattering
concept was used to realize a solar mini-module with a scattering spectrum close to white. The calculated relative loss in short-circuit current is only 19%. The nanoparticle pixel arrays can be made using soft imprint lithography opening up an alternative route for designing low loss colored PV modules.
Effects of Sulfurization Time on MoS2 Absorber Layer for Thin Films Solar Cells Applications
Creators: name: Rashid, H.
name: Rahman, K.S.
name: Hossain, M.I.
name: Alharbi, F.H.
name: Tabet, N.
name: Islam, M.A.
name: Amin, N.
Publisher: name: WIP
Year: 2017
Subjects: New Materials and Concepts for Photovoltaic Devices
New Materials and Concepts for Cells and Modules

description: 33rd European Photovoltaic Solar Energy Conference and Exhibition; 137-140
description: Thin films of MoS2 were prepared on top of soda lime glass by using RF magnetron sputtering
technique and further sulfurized under different timing profiles with static gas pressure of Nitrogen in growth
chamber set at 370 torr at room temperature (RT). Four different time intervals i.e. 60 min, 90 min, 120 min and 150
min were considered at 597 °. The effects of this parameter change were studied on absorber layer properties for
photovoltaic solar cell applications. The structural, topographical and morphological properties as well as cross
sectional thickness of MoS2 layers were analysed. MoS2 films were grown at RT at 100W RF power by sputtering.
As-deposited films exhibited two XRD peaks corresponding to (100) HEX and (110) HEX planes at 2 = 33.4° and 59.5°
respectively, whereas post-deposition treatment (sulfurization) revealed four diffraction peaks corresponding to
(002)HEX, (100)HEX, (103)HEX and (110) HEX at 14.3°, 33.7°, 39.9° and 59.4° respectively. Thickness of sulfurized
films was measured within the range of 446.6 nm to 595.5 nm during FESEM while as-deposited film was measured
419.5 nm and surface was observed to be rough for films sulfurized for 60 min and 90 min. EDX results showed
S/Mo ratio as 3.01 for films sulfurized for 120 minutes whereas as-deposited film was with 2.44 ratio. Film
morphology was found to be very smooth with a low average surface roughness value of 0.98 nm for films sulfurized
for 150 min. Enriched ratio of S/Mo, XRD peaks validation and surface morphological results encouraged its
potential suitability for the use of MoS2 as absorber layer material for solar photovoltaic applications.
Robustness Assessment of Complex Networks using the Idle Network
Creators: name: Engsig, Marcus
name: Tejedor, Alejandro
name: Moreno, Yamir
Publisher: name: arXiv
Year: 2022
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: Network robustness is an essential system property to sustain functionality in the face of failures or targeted attacks. Currently, only the connectivity of the nodes unaffected by an attack is utilized to assess robustness. We propose to incorporate the properties of the emerging connectivity of the nodes affected by the attack (Idle Network), which is demonstrated to contain pertinent information about network robustness, improving its assessment accuracy. The Idle network information offers the potential to generalize models, enabling them to estimate robustness for unseen attacks.
Reflection and transmission of elastic waves at interfaces embedded in non-local band-gap metamaterials: a comprehensive study via the relaxed micromorphic model
Creators: name: Madeo, Angela
name: Neff, Patrizio
name: Ghiba, Ionel-Dumitrel
name: Rosi, Giuseppe
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: In this paper we derive, by means of a suitable least action principle, the duality jump conditions to be imposed at surfaces of discontinuity of the material properties in non-dissipative, linear-elastic, isotropic, Mindlin's and relaxed micromorphic media, respectively. The introduced theoretical framework allows the transparent set-up of different types of micro-macro connections which are intrinsically compatible with the governing bulk equations. To illustrate the interest of the many introduced jump conditions, we focus on the case of an interface between a classical Cauchy continuum on one side and a relaxed micromorphic one on the other side. As expected, we find a complete reflection in the frequency intervals for which band-gaps are known to occur in the relaxed micromorphic continuum and precise microstructure-related reflective patterns are identified. We repeat a similar study for analogous connections between a classical Cauchy continuum and a Mindlin's micromorphic one and we show that the reflective properties of the considered interfaces are drastically modified due to the fact that band-gaps are not allowed in standard Mindlin's micromorphic media. The present work opens the way towards the possibility of conceiving complex metastructures in which band-gap metamaterials and classical materials are coupled together to produce structures with completely new and unorthodox properties with respect to wave propagation, transmission and reflection. Last, but not least, indirect measurements of the material coefficients of the relaxed micromorphic model based upon real experiments of reflection and transmission in band-gap metamaterials are uncovered by the present work which makes them finally realizable in the short term.
3D Cylindrical Approach to Determine the Excess Minority Carriers’ Density of an n+/p Solar Cell under Constant Monochromatic Illumination
Creators: name: Diouf, A.
name: Leye, S.N.
name: Mbodji, S.
name: Diao, A.
name: Sissoko, G.
Publisher: name: WIP
Year: 2017
Subjects: New Materials and Concepts for Photovoltaic Devices
Fundamental Studies

description: 33rd European Photovoltaic Solar Energy Conference and Exhibition; 73-77
description: The columnar cylindrical model is used for the characterization of an N+/P polycrystalline silicon solar cell in steady state under monochromatic illumination. From this model and using both the Bessel functions and the dynamic junction recombination velocity, the continuity equation has been solved. A new expression of the excess minority carriers’ density in the base depending to the radius (r) and the depth (z) at a position of the grain is obtained. This mathematical modeling allowed us to study the effects of grain size (R) and grain boundaries recombination velocity (Sgb) on the behavior of excess minority carriers’ density in the base of the solar cell.
title: Archäologische Reviere
title: Individuelle Forschungsräume in der Ur- und Frühgeschichtlichen Archäologie
titleType: Subtitle
Creators: name: Grunwald, Susanne
Publisher: name: Freie Universität Berlin
Year: 2015
Subjects: subject: Wissenschaftsgeschichte
subject: individueller Wissensraum
subject: kollektiver Wissensraum
subject: Territorialität von Forschung
subject: History of Sciences
subject: individual knowledge space
subject: collective knowledge space
subject: territoriality of research
subject: 900 Geschichte und Geografie::930 Geschichte des Altertums (bis ca. 499), Archäologie

description: In diesem Beitrag wird der Begriff ‚Archäologisches Revier‘ als eine neue wissenschaftssoziologische Analysekategorie vorgestellt, mit der individuelle Wissensräume und die ‚Territorialität‘ von Forscher/innen erfasst und untersucht werden können. Bislang fehlen Termini und Kategorien, mit denen auch in historischer Perspektive die Wissensproduktion von Individuen in Hinblick auf ihre Raumbezüge beschrieben und gegenüber kollektiver, institutioneller Wissensverortung abgegrenzt werden können. Am Beispiel der Debatten um Wallanlagen in der Oberlausitz aus der Frühphase der Institutionalisierung der Ur und Frühgeschichtlichen Archäologie in der ersten Hälfte des 20. Jahrhunderts soll gezeigt werden, welche nachweisbaren Auswirkungen dieses mit dem Begriff Archäologisches Revier umschriebene Raumverhalten auf inhaltliche Auseinandersetzungen und auf die Arbeit von Archäologen und archäologischen Institutionen hat.
description: This paper introduces the term “Archäologisches Revier” as a new category to analyze aspects of the sociology of archaeological knowledge and science, especially individual knowledge spaces and the territoriality of scientists. The History of German Archaeology currently lacks terms and categories to analyze present works as well as past research regarding its territorial dimension and as opposed to collective, institutionalized knowledge spaces. Debates from the Oberlausitz Region at the very beginning of the institutionalization of Pre- and Early History as a scientific field will be used as examples for noticeable effects of territorial behavior on discussions and practice of archaeologists and archaeological institutions. To describe such territorial behavior and its effects, the term “Archäologisches Revier” is instrumental.
CrossCBR: Cross-view Contrastive Learning for Bundle Recommendation
Creators: name: Ma, Yunshan
name: He, Yingzhi
name: Zhang, An
name: Wang, Xiang
name: Chua, Tat-Seng
Publisher: name: arXiv
Year: 2022
Subjects: subject: Information Retrieval (cs.IR)
subject: FOS: Computer and information sciences

description: Bundle recommendation aims to recommend a bundle of related items to users, which can satisfy the users' various needs with one-stop convenience. Recent methods usually take advantage of both user-bundle and user-item interactions information to obtain informative representations for users and bundles, corresponding to bundle view and item view, respectively. However, they either use a unified view without differentiation or loosely combine the predictions of two separate views, while the crucial cooperative association between the two views' representations is overlooked. In this work, we propose to model the cooperative association between the two different views through cross-view contrastive learning. By encouraging the alignment of the two separately learned views, each view can distill complementary information from the other view, achieving mutual enhancement. Moreover, by enlarging the dispersion of different users/bundles, the self-discrimination of representations is enhanced. Extensive experiments on three public datasets demonstrate that our method outperforms SOTA baselines by a large margin. Meanwhile, our method requires minimal parameters of three set of embeddings (user, bundle, and item) and the computational costs are largely reduced due to more concise graph structure and graph learning module. In addition, various ablation and model studies demystify the working mechanism and justify our hypothesis. Codes and datasets are available at https://github.com/mysbupt/CrossCBR.
description: 9 pages, 5 figures, 5 tables; this the 3rd version that fixes a typo in table 1
Understanding the Light-Induced Degradation at Elevated Temperatures: Similarities between Multicrystalline and Floatzone p-Type Silicon
Creators: name: Niewelt, T.
name: Schindler, F.
name: Kwapil, W.
name: Eberle, R.
name: Schön, J.
name: Schubert, M.C.
Publisher: name: WIP
Year: 2017
Subjects: Silicon Photovoltaics
Feedstock, Crystallisation, Wafering, Defect Engineering

description: 33rd European Photovoltaic Solar Energy Conference and Exhibition; 218-225
description: This paper discusses degradation phenomena in crystalline silicon. We present new investigations of the
light- and elevated temperature induced degradation (LeTID) of multicrystalline silicon. The investigations provide
insights into the defect parameters as well as the diffusivity and solubility of impurity species contributing to the defect.
We discuss possible defect precursor species and can rule out several metallic impurities. We find that an involvement
of hydrogen in the defect could explain the characteristic observations for LeTID. Furthermore, we demonstrate
analogies to the light-induced degradation mechanisms at elevated temperatures observed in floatzone silicon, where
several experimental results also indicate an involvement of hydrogen in the defect. Based on the similarities between
multicrystalline and floatzone silicon we suggest that both degradation phenomena might be caused by the same or
similar defects. As we do not expect large concentrations of cobalt in floatzone silicon, we suggest that complexes of
intrinsic lattice defects and hydrogen might cause both degradation phenomena.
Classification of Multidimensional Darboux Transformations: First Order and Continued Type
Creators: name: Hobby, David
name: Shemyakova, Ekaterina
Publisher: name: arXiv
Year: 2016
Subjects: subject: Differential Geometry (math.DG)
subject: Mathematical Physics (math-ph)
subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 16S32, 37K35, 37K25

description: We analyze Darboux transformations in very general settings for multidimensional linear partial differential operators. We consider all known types of Darboux transformations, and present a new type. We obtain a full classification of all operators that admit Wronskian type Darboux transformations of first order and a complete description of all possible first-order Darboux transformations. We introduce a large class of invertible Darboux transformations of higher order, which we call Darboux transformations of continued Type I. This generalizes the class of Darboux transformations of Type I, which was previously introduced. There is also a modification of this type of Darboux transformations, continued Wronskian type, which generalize Wronskian type Darboux transformations.
title: Der Aspekt der Hinsicht
title: Überlegungen zum Verhältnis von Raum und Wissen im platonischen Bildbegriff
titleType: Subtitle
Creators: name: Poetsch, Christoph
Publisher: name: Freie Universität Berlin
Year: 2015
Subjects: subject: Platon
subject: Raum
subject: Wissen
subject: chôra
subject: eikôn
subject: phantasma
subject: skiagraphia
subject: Bild
subject: 900 Geschichte und Geografie::930 Geschichte des Altertums (bis ca. 499), Archäologie

description: Platon gilt gemeinhin nicht als Freund von Bild und Kunst, insofern diese einer wahren Erkenntnis diametral entgegenstehen. Anhand der Trias von Raum, Wissen und Bild wird aufgezeigt, dass Platon das Verhältnis von Bild und Wissen in mehreren Hinsichten in dezidiert räumlichen Kategorien erörtert, womit sich seine Bildkritik auf den Bereich der skiagraphia einschränken lässt. In einem zweiten Schritt werden Raum und Wissen vor dem Hintergrund von Platons Prinzipienlehre aufeinander bezogen, wobei der strukturellen Parallele von Bild und chôra eine entscheidende Rolle zukommt. Hierdurch ergibt sich, dass – expliziert an Platons Höhlengleichnis – dem Bild eine entscheidende Rolle im Aufstieg zur Erkenntnis zukommen kann. Weiterhin wird im Anschluss an den platonischen Ansatz ein Raumbegriff skizziert, der den Raum über die Kategorie des Sinns zu begreifen sucht.
description: Plato is not said to be a friend of images and fine art. According to him, they are both opposed to true knowledge. Based on the triad of space, knowledge and image this essay demonstrates, that Plato discusses the relation between image and knowledge in several decidedly spatial aspects. This leads to a limitation of Plato‘s critique of the images to skiagraphia. In a second step, this essay relates the concepts of space and knowledge to each other against the background of Plato’s Theory of the Principles, thereby emphasizing the structural parallels within the concepts of chôra and image. These two steps demonstrate – as illustrated in Plato’s Allegory of the Cave –, how the image can play an important role in the ascension towards true knowledge. Based on this hypothesis, this essay will furthermore sketch a concept of space which allows one to grasp the notion of space through the category of sense.
title: Vergangenheit als Wissensraum
title: Zur Konstruktion von Wissensräumen am Beispiel des altägyptischen Hauses H72 von Elephantine
titleType: Subtitle
Creators: name: Korhonen, Arvi
Publisher: name: Freie Universität Berlin
Year: 2015
Subjects: subject: Archäologisches Wissen
subject: Wissensraum
subject: Vergangenheit
subject: Radikaler Konstruktivismus
subject: Wissenskonstruktion
subject: Interpretation
subject: Ägyptologie
subject: Archäologie
subject: 900 Geschichte und Geografie::930 Geschichte des Altertums (bis ca. 499), Archäologie

description: Im vorliegenden Beitrag wird die Konstruktion von Wissensräumen untersucht. Dazu wird der Frage nachgegangen, ob Vergangenheit per se als ein Wissensraum begriffen werden kann. Über die auf die Vergangenheit bezogene Entstehung archäologischen Wissens wird anhand der Radikalkonstruktivistischen Theorie des Wissens reflektiert und darauf stützend eine Definition von Wissensraum erarbeitet. Darauf aufbauend wird die Konstruktion von Wissensräumen anhand eines archäologischen Beispiels, des altägyptischen Hauses H72 von Elephantine, dargestellt und diskutiert. Mithilfe dieser Ausführungen möchte ich die Frage, ob Vergangenheit als ein Wissensraum verstanden werden kann, mehrdimensional beantworten. Anschließend werden die Konsequenzen der dargebotenen Antwort diskutiert.
description: The article focusses on the construction of “spaces of knowledge” (Wissensräume). The following question is at the center of discussion: Can the past per se be understood as a separate and detached space of knowledge? As theoretical framework I use radical constructivist theory – theory of knowledge. The paper discusses the perception of knowledge and consequences of the offered definition for archaeological knowledge about the past. Illustrated by an archaeological example I will demonstrate how spaces of knowledge are being constructed. On the basis of these reflections I will give an answer to my research question. However, the answer will not be yes or no but will combine the two to give a more adequate picture of a complex phenomenon. In the last section I will reflect on the consequences for archaeology as such.
Divide and Congruence II: From Decomposition of Modal Formulas to Preservation of Delay and Weak Bisimilarity
Creators: name: Fokkink, Wan
name: van Glabbeek, Rob
Publisher: name: arXiv
Year: 2016
Subjects: subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences
subject: F.3.2; D.3.1; F.4.1

description: Earlier we presented a method to decompose modal formulas for processes with the internal action $τ$, and congruence formats for branching and $η$-bisimilarity were derived on the basis of this decomposition method. The idea is that a congruence format for a semantics must ensure that the formulas in the modal characterisation of this semantics are always decomposed into formulas that are again in this modal characterisation. In this follow-up paper the decomposition method is enhanced to deal with modal characterisations that contain a modality $\langleε\rangle\langle a\rangleϕ$, to derive congruence formats for delay and weak bisimilarity.
description: An extended abstract of this paper appeared in Proc. LICS'16. With Definition 20.4b(i) as formulated originally [v1], Proposition 5 does not hold. A corrected Definition 20.4b appears in this revision [v2]
Early Visual Cultures and Panofsky’s Perspektive als ‘symbolische Form’
Creators: name: Bawden, Tina
name: Bonatz, Dominik
name: Dietrich, Nikolaus
name: Fabricius, Johanna
name: Gludovatz, Karin
name: Muth, Susanne
name: Poiss, Thomas
name: Werning, Daniel A.
Publisher: name: Freie Universität Berlin
Year: 2016
Subjects: subject: Perspective
subject: Erwin Panofsky
subject: pictorial space
subject: spatial perception
subject: cultural skill
subject: visualiza- tion
subject: diagram
subject: 900 Geschichte und Geografie::930 Geschichte des Altertums (bis ca. 499), Archäologie

description: This paper investigates the historical dimension of perspectival representations. It aims to provide a heterogeneous though comparative picture of culturally unrelated visual con- ceptualizations of pictorial spaces, written with a view toward explaining how the multiple modes of perspective were introduced in antiquity. Point of departure for this critical approach is Erwin Panofsky’s essay Die Perspektive als ‘symbolische Form’ , published in 1927. His essay analyses the pictorial visualization of space and spatiality in different historical contexts, examining their cultural codification in terms of the heuristic category of ‘sym- bolic form’. However, ‘perspective’, which is commonly understood as synonymous with ‘linear perspective’, deserves a new discussion in the context of diverse visual cultures: A ‘naturalisation’ of the gaze as it is suggested by pictorial spaces which function mimetically is primarily associated with the early modern period in Western art. Instead of merely re- reading Panofsky’s canonical text, this paper presents an interdisciplinary re-viewing of a selection of the pictorial examples chosen by Panofsky, commenting upon their perspec- tive(s) from different vantage points.
The Laguerre finite difference one-way equation solver
Creators: name: Terekhov, Andrew V.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: This paper presents a new finite difference algorithm for solving the 2D one-way wave equation with a preliminary approximation of a pseudo-differential operator by a system of partial differential equations. As opposed to the existing approaches, the integral Laguerre transform instead of Fourier transform is used. After carrying out the approximation of spatial variables it is possible to obtain systems of linear algebraic equations with better computing properties and to reduce computer costs for their solution. High accuracy of calculations is attained at the expense of employing finite difference approximations of higher accuracy order that are based on the dispersion-relationship-preserving method and the Richardson extrapolation in the downward continuation direction. The numerical experiments have verified that as compared to the spectral difference method based on Fourier transform, the new algorithm allows one to calculate wave fields with a higher degree of accuracy and a lower level of numerical noise and artifacts including those for non-smooth velocity models. In the context of solving the geophysical problem the post-stack migration for velocity models of the types Syncline and Sigsbee2A has been carried out. It is shown that the images obtained contain lesser noise and are considerably better focused as compared to those obtained by the known Fourier Finite Difference and Phase-Shift Plus Interpolation methods. There is an opinion that purely finite difference approaches do not allow carrying out the seismic migration procedure with sufficient accuracy, however the results obtained disprove this statement. For the supercomputer implementation it is proposed to use the parallel dichotomy algorithm when solving systems of linear algebraic equations with block-tridiagonal matrices.
The Grace Machine: Of Turns, Wheels and Limbs
Creators: name: Spuybroek, Lars
Publisher: name: FOOTPRINT
Year: 2018

description: The following essay revolves around the notion of the figure and its relationship with grace. The figure, both object and event, is posited as what emerges in what is called ‘the gap between habit and inhabitation’. The essay is structured in three parts that each contribute to the argument that habit and inhabitation are part of the ancient structure of grace, which extends to many domains such as religion, economy and art, but above all to technology. The first part establishes the concept of grace within gift exchange where the aesthetics of gracefulness is not defined by gesture or action, but by the combination of a cyclical rhythm and the verticality of stance. The second part restructures the cycle as one of habit, linking our relationship with technology to gift exchange, while developing the central argument of grace as a machine. The final and third part expands the role of play and mimesis in the functioning of the grace machine while defining the gap between habit and inhabitation as a double gap, consisting of a temporal axis that leads from habit to the figure of grace, which again is suspended between object and field on the spatial axis.
description: FOOTPRINT, Issue # 22 | Spring / Summer 2018 | Exploring Architectural Form: A Configurative Triad
Performance Characterization of Crystalline Silicon Solar Cells Based on Combination of Plasmonics Silver Nanoparticles and Luminescent Downshifting Eu-Doped Phosphor-Particles
Creators: name: You, B.-J.
name: Ho, W.-J.
name: Feng, S.-K.
name: Lin, Z.-X.
name: Liu, J.-J.
Publisher: name: WIP
Year: 2017
Subjects: New Materials and Concepts for Photovoltaic Devices
New Materials and Concepts for Cells and Modules

description: 33rd European Photovoltaic Solar Energy Conference and Exhibition; 133-136
description: The photovoltaic-performance characterizations of crystalline silicon (C-Si) solar cells based on the combination of plasmonics scattering of silver nanoparticles (Ag NPs) and luminescent downshifting (LDS) of Eu-doped phosphor-particles are experimentally demonstrated in this work. The surface morphologies and plasmonics scattering of Ag NPs of various dimensions are characterized by the measurements of scanning electron microscopy (SEM), optical reflectance and absorbance, and external quantum efficiency (EQE). Furthermore, the LDS characteristics of Eu-doped phosphor-particles silicate layer coated by spin-on film technique over the surface of Ag NPs are revealed on the spectrum of optical reflectance and EQE. The photovoltaic-performance improvements of the C-Si solar cells with the combination of plasmonics scattering and LDS are confirmed by photovoltaic current-voltage (I-V) measurement under one sun AM
1.5G illumination. In this study, the efficiency enhancement of 21.95% for the cell with a antireflective coating (ARC) of
SiO2, 23.62% for the cell with Ag NPs embedded in a pure SiO2 ARC, and 26.49% for the cell with Ag NPs embedded in
a Eu-doped phosphor-SiO2 ARC were obtained, respectively, compared to the reference bare solar cells.
Transversing Formalisms
Creators: name: Kousoulas, Stavros
name: Mejía Hernández, Jorge
Publisher: name: FOOTPRINT
Year: 2018

description: In the editorial introduction of this issue of Footprint, the question of architectural form is approached from a population of minor perspectives. Inspired by Bateson’s metalogues, the authors wish to bring forward multiple questions on architectural form instead of a single generalizing one: from ‘what is form’ to ‘how, when, where and why is form’. In this respect, they examine the ways for a possible reconciliation between the genetic and the generic, between the discursive outlines of various formalisms, opting for an approach that is both syncretic and transversal. Committed to architectural form, they conclude by claiming that it stands for much more than simply a concept. Form, in its ambiguity and heterogeneity, stands for a shared problem, one that brings together disciplines, schools of thought and variant methodological practices, turning therefore the discursive constraints of the past in productive chances for the future.
description: FOOTPRINT, Issue # 22 | Spring / Summer 2018 | Exploring Architectural Form: A Configurative Triad