cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Nonlinear Hall effect in two-dimensional class AI metals
Creators: name: Liao, Zi-Shan
name: Zhang, Hong-Hao
name: Yan, Zhongbo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In a time-reversal invariant system, while the anomalous Hall effect identically vanishes in the linear response regime due to the constraint of time-reversal symmetry on the distribution of Berry curvature, a nonlinear Hall effect can emerge in the second-order response regime if the inversion symmetry is broken to allow a nonzero Berry curvature dipole (BCD) on the Fermi surface. In this work, we study the nonlinear Hall effect of the BCD origin in two-dimensional doped insulators and semimetals belonging to the symmetry class AI which has spinless time-reversal symmetry. Despite that the class AI does not host any strong topological insulator phase in two dimensions, we find that they can still be classified as topologically obstructed insulators and trivial insulators if putting certain constraint on the Hamiltonians. When the insulator gets closer to the phase boundary of the two distinct phases, we find that the BCDs will become more prominent if the doping level is located near the band edge. Moreover, when the insulator undergoes a phase transition between the two distinct phases, we find that the BCDs will dramatically change their signs. For the semimetals without inversion symmetry, we find that the BCDs will sharply reverse their signs when the doping level crosses the Dirac points. With the shift of the locations of Dirac points in energy, the critical doping level at which the BCDs sharply reverse their signs will accordingly change. Our study reveals that class AI materials can also have interesting geometrical and topological properties, and remarkable nonlinear Hall effect can also appear in this class of materials even though the spin-orbit coupling is negligible. Our findings broaden the scope of materials to study the nonlinear Hall effect and provide new perspectives for the application of this effect.
description: 13 pages, 8 figures
MIMO-OFDM Optimal Decoding and Achievable Information Rates Under Imperfect Channel Estimation
Creators: name: Sadough, Sajad
name: Piantanida, Pablo
name: Duhamel, Pierre
Publisher: name: arXiv
Year: 2007
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: Optimal decoding of bit interleaved coded modulation (BICM) MIMO-OFDM where an imperfect channel estimate is available at the receiver is investigated. First, by using a Bayesian approach involving the channel a posteriori density, we derive a practical decoding metric for general memoryless channels that is robust to the presence of channel estimation errors. Then, we evaluate the outage rates achieved by a decoder that uses our proposed metric. The performance of the proposed decoder is compared to the classical mismatched decoder and a theoretical decoder defined as the best decoder in the presence of imperfect channel estimation. Numerical results over Rayleigh block fading MIMO-OFDM channels show that the proposed decoder outperforms mismatched decoding in terms of bit error rate and outage capacity without introducing any additional complexity.
MUSTAQIL TASVIRIY FAOLIYATNING MAZMUNI. MUSTAQIL TASVIRIY FAOLIYATGA RAHBARLIK
Creators: name: Raximova, To'xtajon
Publisher: name: Zenodo
Year: 2024

description: Bolalarning badiiy jihatdan tarbiya olishi faqatgina mashg'ulot jarayonida emas, balki kundalik hayotda yuzaga keladi. Bu o'rinda bolaning o'z faolligi jarayonida yuzaga keluvchi mustaqil tasviriy faoliyat muhim rol o'ynaydi. U bu jarayonda mashg'ulotlarda olgan badiiy tajribasidan foydalanadi.
Rheologische Eigenschaften flüssiger Rübensilagen
Creators: name: Türk, Meno
name: Hörnig, Günter
Publisher: name: LANDTECHNIK
Year: 1998

description: Beschrieben werden Untersuchungen zum Förder- und Lagerverhalten von trockensubstanzreichen frisch gemusten und silierten Rüben für die Rinderfütterung. Diese Dickstoffe sind im Grenzbereich der Fließfähigkeit einzuordnen und dementsprechend schwer zu kennzeichnen. Herkömmliche Viskosimeter sind nicht einsetzbar. Die Ergebnisse der Förderversuche sind Voraussetzung für die Rohrleitungsdimensionierung und Pumpenauslegung. Dazu kann das Rechenprogramm ROHRWIN genutzt werden.
description: LANDTECHNIK, Bd. 53 Nr. 2 (1998)
Effect of macromolecular crowding on the rate of diffusion-limited enzymatic reaction
Creators: name: Agrawal, Manish
name: Santra, S. B.
name: Anand, Rajat
name: Swaminathan, Rajaram
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Subcellular Processes (q-bio.SC)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: The cytoplasm of a living cell is crowded with several macromolecules of different shapes and sizes. Molecular diffusion in such a medium becomes anomalous due to the presence of macromolecules and diffusivity is expected to decrease with increase in macromolecular crowding. Moreover, many cellular processes are dependent on molecular diffusion in the cell cytosol. The enzymatic reaction rate has been shown to be affected by the presence of such macromolecules. A simple numerical model is proposed here based on percolation and diffusion in disordered systems to study the effect of macromolecular crowding on the enzymatic reaction rates. The model explains qualitatively some of the experimental observations.
description: 6 pages, 4 figures
Discovery of new therapeutic targets in Neuroblastoma by means of proteomic approach and functional studies
Creators: name: Cimmino, Flora
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2010

description: Neuroblatoma (NB) is an embryonal tumor of the sympathetic nervous system which arises from the neural crest cells. This disease rappresents the most common extracranial tumor in infants, accounting for 8% to 10% of all childhood cancer and for approximately 15% of cancer deaths in children.
NB is a heterogeneous tumor for which biology dictates clinical behaviour.
It comprises cases with divergent outcome ranging from spontaneous differentiation to metastatic forms with poor prognosis. The deep knowledge of NB biology is imperative toward the development of novel therapy.
The most favourable subset of  NB (stage 4S) can spontaneously differentiate in neurons or regress to a benign tumour phenotype. Retinoic Acid (RA) is a known neural differentiation-inducing agent actually used in NB therapy. In order to get new insights in the molecular mechanism driving neuronal differentiation in vitro, two-Dimensional Differential In-Gel Electrophoresis (2D-DIGE) analyse was performed on the cytosolic and nuclear protein expression patterns of NB cells following RA treatment. The combination of a proteomic approach and sub-cellular fractionation of the proteome provides the identification of 33 differentially expressed proteins during RA treatment in NB. The identified proteins have important roles in a variety of pathways which may have role on NB development and in NB RA-induced differentiation. The results also strength the use of proteomics to discover new putative protein targets in cancer.
Expression of Trk receptors is an important prognostic factor in NB. TrkB and its ligand BDNF (brain derived neurotrophin factor) are preferentially expressed in NB with poor prognosis, conferring invasive and metastatic potential to the tumor cells as well as enhancing therapy resistance. TrkA in contrast is high expressed in tumor with good outcome. Galectin-1 (Gal-1), a very promising cancer target, is involved in modulating cell proliferation, cell death and cell migration and was found to be up-regulated in patients with aggressive, relapsing NB. Gal-1 is a down-stream mediator of TrkB signalling, since its espression is increased in human SY5Y NB cells upon activation of ectopically expressed TrkB (SY5Y-TrkB), but not TrkA (SY5Y-TrkA). Functional studies here presented underlined the Gal-1 role to mediate invasion and migration in TrkB over-expressing NB cells, thus being activated by BDNF. This establishes Gal-1 as a potential therapeutic marker in high-risk TrkB-expressing NB.
The standard model on a domain-wall brane?
Creators: name: Davies, Rhys
name: George, Damien P.
name: Volkas, Raymond R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We propose a 4+1-dimensional action that is a candidate for realising a standard-model-like effective theory for fields dynamically localised to a domain-wall brane. Our construction is based in part on the conjecture that the Dvali-Shifman mechanism for dynamically localising gauge bosons works correctly in 4+1-d. Assuming this to be so, we require the gauge symmetry to be SU(5)in the bulk, spontaneously breaking to SU(3)xSU(2)xU(1) inside the domain wall, thus dynamically localising the standard model gauge bosons provided that the SU(5) theory in the bulk exhibits confinement. The wall is created jointly by a real singlet-Higgs field eta configured as a kink, and an SU(5) adjoint-Higgs field chi that takes nonzero values inside the wall. Chiral 3+1-dimensional quarks and leptons are confined and split along the bulk direction via their Yukawa couplings to eta and chi. The Higgs doublet and its colour triplet SU(5) partner are similarly localised and split. The splittings suppress coloured-Higgs-induced proton decay and, because of the different localisation profiles, the usual SU(5) mass relation m_e = m_d does not arise. Localised gravity is generated via the Randall-Sundrum alternative to compactification.
description: 7 pages, 2 figures. This version to appear in PRD. Significant added discussion on the Dvali-Shifman mechanism, mode-analyses and the effect of warped gravity. Added references
Lossy Quantum Defect Theory of Ultracold Molecular Collisions
Creators: name: Christianen, Arthur
name: Groenenboom, Gerrit C.
name: Karman, Tijs
Publisher: name: arXiv
Year: 2021
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We consider losses in collisions of ultracold molecules described by a simple statistical short-range model that explicitly accounts for the limited lifetime of classically chaotic collision complexes. This confirms that thermally sampling many isolated resonances leads to a loss cross section equal to the elastic cross section derived by Mayle et al. [Phys. Rev. A 85, 062712 (2012)], and this makes precise the conditions under which this is the case. Surprisingly, we find that the loss is nonuniversal. We also consider the case that loss broadens the short-range resonances to the point that they become overlapping. The overlapping resonances can be treated statistically even if the resonances are sparse compared to $k_BT$, which may be the case for many molecules. The overlap results in Ericson fluctuations which yield a nonuniversal short-range boundary condition that is independent of energy over a range much wider than is sampled thermally. Deviations of experimental loss rates from the present theory beyond statistical fluctuations and the dependence on a background phase shift are interpreted as non-chaotic dynamics of short-range collision complexes.
A Review of Modeling, Management, and Applications of Grid-Connected Li-ion Battery Storage Systems (Slides)
Creators: Caisheng Wang
Publisher: name: IEEE
Year: 2023

The intermittency of renewable energy sources makes the use of energy storage systems (ESSs) indispensable in modern power grids for supply-demand balancing and reliability enhancement. Battery ESSs (BESSs), Li-ion batteries in particular, possess attractive properties and are taking over other types of storage technologies as the electric vehicle (EV) market is booming and the shift to EVs is irreversible. Battery storage is a multidisciplinary area, which is of great interest to and is being studied by different communities. For electrical power professionals who are interested in this important topic but do not have sufficient background, it is not an easy and trivial task to go through the �literature jungle� without being overwhelmed or even lost. A working group has been formed on the Management of Distributed Battery Storage Systems by Energy Development and Power Generation (EDPG) Committee, Power and Energy Society, IEEE, to address this challenge. In this talk, as one of the outcomes of the working group�s efforts, the core background issues are reviewed as well as the indispensable literature surrounding the essential topics of material fundamentals, modeling, characterization, management, applications, and market participation of Li-ion batteries to lay out an overarching theme of the management of grid-connected battery systems.
The intermittency of renewable energy sources makes the use of energy storage systems (ESSs) indispensable in modern power grids for supply-demand balancing and reliability enhancement. Battery ESSs (BESSs), Li-ion batteries in particular, possess attractive properties and are taking over other types of storage technologies as the electric vehicle (EV) market is booming and the shift to EVs is irreversible. Battery storage is a multidisciplinary area, which is of great interest to and is being studied by different communities. For electrical power professionals who are interested in this important topic but do not have sufficient background, it is not an easy and trivial task to go through the "literature jungle" without being overwhelmed or even lost. A working group has been formed on the Management of Distributed Battery Storage Systems by Energy Development and Power Generation (EDPG) Committee, Power and Energy Society, IEEE, to address this challenge. In this talk, as one of the outcomes of the working group's efforts, the core background issues are reviewed as well as the indispensable literature surrounding the essential topics of material fundamentals, modeling, characterization, management, applications, and market participation of Li-ion batteries to lay out an overarching theme of the management of grid-connected battery systems.
Identification of genes that regulate bone marrow stromal cell differentiation by RNA interference
Creators: name: Cantilena, Bruno
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2010

description: Mesenchymal stem cells (MSCs) can be isolated from bone marrow and can differentiate in a variety of cell types, including osteoblasts, adipocytes, chondrocytes, myoblasts, hepatocytes, and neural cells. For this reason, MSCs are very promising for the development of cell-based therapy for degenerative diseases. Understanding the mechanisms behind MSC cell fate determination is not easy, since the molecular processes that drive differentiation are complex and poorly understood. Even though in the recent years many improvements have been done, many mechanism need to be elucidated. We planned to investigate on differentiation mechanisms of MSC and, in particular, we focused our activities towards osteoblast differentiation; at this aim, we have silenced specific mRNAs using a mouse shRNA library in a 96 well plate-based screening strategy. With this methodology we identified sevral genes that are possible candidates for a role in osteoblast differentiation.
Among the candidate genes, a consistent fraction was represented by genes whose function is still unknown: we focused our attention on a short number of these genes that we named ObI (Osteoblast inducer). In this thesis project we focused our experiments on a particular gene, that we named ObI-1.
We also considered genes identified during the screening with a known function but an unknown role during the osteogenic differentiation process. Among these genes we focused our attention on Angiotensin receptor 1 (AT1R), whose role in osteogenic differentiation had been previously suggested.
For both candidates that we analyzed for this project we confirmed the effects of silencing on osteogenic differentiation and we analyzed expression in tissues and in our cell culture system. Furthermore, we characterized function and mechanism of action in osteoblastogenesis for both genes.
Lagerung und Dosierung von Biofestbrennstoffen
Creators: name: Fürll, Christian
name: Schuricht, Thomas
Publisher: name: LANDTECHNIK
Year: 1998

description: Verbrennungsanlagen für Biofestbrennstoffe stehen in der Praxis unter einem starken Kostendruck. Lager und Dosierbehälter für Holzhackschnitzel können gegenüber der Praxis einfacher gestaltet werden, wenn die Dimensionierung auf der Grundlage der im Labor ermittelten Fließeigenschaften erfolgt. Bei pelletierten oder brikettierten Biofestbrennstoffen aus Stroh oder Holz darf ein zulässiger Abriebanteil nicht überschritten werden, wenn Auslaufstörungen in Behältern mit kostengünstigen Entnahmesystemen vermieden werden sollen.
description: LANDTECHNIK, Bd. 53 Nr. 2 (1998)
Signatures of Non-Gaussianity in the Curvaton Model
Creators: name: Enqvist, Kari
name: Takahashi, Tomo
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We discuss the signatures of non-Gaussianity in the curvaton model where the potential includes also a non-quadratic term. In such a case the non-linearity parameter f_NL can become very small, and we show that non-Gaussianity is then encoded in the non-reducible non-linearity parameter g_NL of the trispectrum, which can be very large. Thus the place to look for the non-Gaussianity in the curvaton model may be the trispectrum rather than the bispectrum. We also show that g_NL measures directly the deviation of the curvaton potential from the purely quadratic form. While g_NL depends on the strength of the non-quadratic terms relative to the quadratic one, we find that for reasonable cases roughly g_NL\sim O(-10^4)-O(-10^5), which are values that may well be accessible by future observations.
description: 10 pages, 4 figures
Study on the energy limits of kHz QPOs in Sco X-1 with $RXTE$ and $Insight$-HXMT observations
Creators: name: Jia, S. M.
name: Qu, J. L.
name: Lu, F. J.
name: Zhang, S. N.
name: Zhang, S.
name: Huang, Y.
name: Wang, D. H.
name: Zhou, D. K.
name: Xiao, G. C.
name: Bu, Q. C.
name: Chen, L.
name: Ma, X.
name: Song, L. M.
name: Tao, L.
name: Cao, X. L.
name: Chen, Y.
name: Liu, C. Z.
name: Xu, Y. P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present a detailed spectral-timing analysis of the Kilohertz quasi-periodic oscillations (kHz QPOs) in Sco X-1 using the data of Rossi X-ray Timing Explorer ($RXTE$) and the Hard X-ray Modulation Telescope ($Insight$-HXMT). The energy band with detectable kHz QPOs is studied for the first time: on the horizontal branch, it is $\sim$ 6.89--24.01 keV and $\sim$ 8.68--21.78 keV for the upper and lower kHz QPOs detected by $RXTE$, and $\sim$ 9--27.5 keV for the upper kHz QPOs by $Insight$-HXMT; on the lower normal branch, the energy band is narrower. The fractional root mean square (rms) of the kHz QPOs increases with energy at lower energy, reaches a plateau at about 16 keV and 20 keV for the lower and upper peaks, and then levels off though with a large uncertainty. The simulation of the deadtime effect of $RXTE$/PCA shows that the deadtime does not affect much the search of the kHz QPOs but makes the rms amplitude underestimated. No significant QPO is detected below $\sim$ 6 keV as shown by the $RXTE$ data, implying that the kHz QPOs do not originate from the black body emission of the accretion disk and neutron star surface. In addition, with the combined analysis of the energy spectra and the absolute rms spectra of kHz QPOs, we suggest that the kHz QPOs in Sco X-1 originate from the Comptonization of the inner part of the transition layer, where the rotation sets the frequency and the inward bulk motion makes the spectrum harder.
Squeezed-light enhancement and backaction evasion in a high sensitivity optically pumped magnetometer
Creators: name: Troullinou, C.
name: Jiménez-Martínez, R.
name: Kong, J.
name: Lucivero, V. G.
name: Mitchell, M. W.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Atomic Physics (physics.atom-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We study the effect of optical polarization squeezing on the performance of a sensitive, quantum-noise-limited optically pumped magnetometer. We use Bell-Bloom (BB) optical pumping to excite a $^{87}$Rb vapor containing $8.2 \cdot 10^{12} \mathrm{atoms/cm^3}$ and Faraday rotation to detect spin precession. The sub-$\mathrm{pT}/\sqrt{\mathrm{Hz}}$ sensitivity is limited by spin projection noise (photon shot noise) at low (high) frequencies. Probe polarization squeezing both improves high-frequency sensitivity and increases measurement bandwidth, with no loss of sensitivity at any frequency, a direct demonstration of the evasion of measurement backaction noise. We provide a model for the quantum noise dynamics of the BB magnetometer, including spin projection noise, probe polarization noise, and measurement backaction effects. The theory shows how polarization squeezing reduces optical noise, while measurement backaction due to the accompanying ellipticity anti-squeezing is shunted into the unmeasured spin component. The method is compatible with high-density and multi-pass techniques that reach extreme sensitivity.
description: 11 pages, 4 figures
Physikalische Stoffeigenschaften
Creators: name: Koch, Karsten
name: Damerow, Lutz
Publisher: name: LANDTECHNIK
Year: 1998

description: Optimierungsstrategien zur Verlustminimierung der Kartoffelqualität und -masse setzen die Kenntnis und die Messbarkeit von Qualitätsmerkmalen und -zuständen sowie deren zielorientierte Anwendung voraus. Es war daher das Ziel dieser Untersuchungen, mit unterschiedlichen Messverfahren physikalische Stoffeigenschaften zu bestimmen, deren Abhängigkeit von pflanzenbaulichen Maßnahmen des Organischen Landbaus zu prüfen sowie den Einfluss verschiedener Sorten festzustellen und Wechselwirkungen nachzuweisen.
description: LANDTECHNIK, Bd. 53 Nr. 2 (1998)
Energiebilanzen im Vergleich
Creators: name: Scholz, Volkhard
name: Hahn, Jürgen
Publisher: name: LANDTECHNIK
Year: 1998

description: Mit Aufwand und Ertrag an Energie können ein Produkt und sein Bereitstellungsverfahren hinsichtlich der Energieeffizienz und der ökologischen Wirkung charakterisiert werden. Das unterstreicht die grundsätzliche Bedeutung von Energiebilanzen. Wie Beispiele zeigen, kann der Energiebedarf zur Bereitstellung von Biotestbrennstoffen erheblich schwanken, was auf bilanzierungsmethodische Ursachen zurückzuführen ist. Eine Abstimmung mit dem Ziel normierter Bilanzierungsmethoden ist erforderlich.
description: LANDTECHNIK, Bd. 53 Nr. 2 (1998)
Countering Adaptive Network Covert Communication with Dynamic Wardens
Creators: name: Mazurczyk, Wojciech
name: Wendzel, Steffen
name: Chourib, Mehdi
name: Keller, Jörg
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cryptography and Security (cs.CR)
subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: Network covert channels are hidden communication channels in computer networks. They influence several factors of the cybersecurity economy. For instance, by improving the stealthiness of botnet communications, they aid and preserve the value of darknet botnet sales. Covert channels can also be used to secretly exfiltrate confidential data out of organizations, potentially resulting in loss of market/research advantage. Considering the above, efforts are needed to develop effective countermeasures against such threats. Thus in this paper, based on the introduced novel warden taxonomy, we present and evaluate a new concept of a dynamic warden. Its main novelty lies in the modification of the warden's behavior over time, making it difficult for the adaptive covert communication parties to infer its strategy and perform a successful hidden data exchange. Obtained experimental results indicate the effectiveness of the proposed approach.
Waschen von Wurzelgemüse und Kartoffeln
Creators: name: Geyer, Martin
name: Oberbarnscheidt, Bernd
Publisher: name: LANDTECHNIK
Year: 1998

description: Wurzelgemüse und Kartoffeln werden überwiegend in Trommelwaschmaschinen gewaschen. Dabei sollen Reinigungsgut und Verunreinigung mithilfe der Reinigungslösung möglichst schonend getrennt werden. Häufiges Problem ist das Auftreten mechanischer Belastungen, da diese zu Qualitätseinbußen am gewaschenen Produkt führen. Durch den Einbau eines Bremssegels konnten sowohl die Anzahl der mechanischen Belastungen als auch die maximalen Kräfte deutlich verringert werden.
description: LANDTECHNIK, Bd. 53 Nr. 2 (1998)
The Japanese hasso Nirvana tradition of paintings : an iconological study
Creators: name: Hunter, Harriet Jean
Publisher: name: University of British Columbia
Year: 2010

description: The purposes of this thesis are to draw attention to and document the radical change that occurred in the Japanese iconographic representation of the Buddha's Parinirvana during the first half of the 13th century; and to relate this iconographic shift to parallel changes in the iconologic accounts of the Nara sects. Specifically. I will assign responsibility for certain of these changes to the early Kamakura monk My6e Shonin (1173-1232). Japanese art historians (Nakano, 1978; Yanagisawa, 1979) have speculated about similar lines of influence. To date, however, a clearly substantiated argument linking the writings of Myoe Shonin to the iconographic changes which emerged in the same historic context has not been made. The research problem is to attempt to establish such linkages by drawing parallels between Myde's revival of the Shaka cult and the associated changes in the subsequent Nirvana painting tradition. Three iconographically distinct images of the Buddha's Nirvana scene will be examined. First, an older iconographic type, exemplified by the painting in the ECong6bu-ji collection (referred to as Type I), will be discussed in order to set the historical context of interpretation. Second, attention will be drawn to the dramatic changes away from this earlier Type I tradition and focused upon a qualitatively different iconographic style present in the icons in the Ryugan-ji and Manju-ji temple collections (referred to as Type II images). Efforts will be made to establish that these changes reflect the writings, teachings, and practices of Myoe Shonin.
Some Enigmatic Aspects of the Early Universe
Creators: name: Sivaram, C
name: Arun, Kenath
name: A, Venkata Manohara Reddy
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Matter collapsing to a singularity in a gravitational field is still an intriguing question. Similar situation arises when discussing the very early universe or a universe recollapsing to a singularity. It is suggested that inclusion of mutual gravitational interactions among the collapsing particles can avert a singularity and give finite value for various physical quantities like entropy, density, etc.
description: 8 pages, 15 equations
Self-resonant Dark Matter
Creators: name: Kim, Seong-Sik
name: Lee, Hyun Min
name: Zhu, Bin
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present a novel mechanism for Sommerfeld enhancement for dark matter interactions without the need for light mediators. Considering a model for two-component dark matter with a triple coupling, we find that one of dark matter particles leads to an $u$-channel resonance in dark matter elastic scattering. From the sum of the $u$-channel ladder diagrams, we obtain a Bethe-Salpeter equation with a delay term and identify the Sommerfeld factor from the elastic scattering of two dark matter components for the first time. We discuss the implications of our results for enhancing dark matter self-scattering and annihilation.
description: 13 pages, 3 figures, Published version in JHEP
Wirkung von Biofiltern
Creators: name: Hartung, Eberhard
name: Martinec, Milos
name: Jungbluth, Thomas
Publisher: name: LANDTECHNIK
Year: 1998

description: Um den Einfluss des Filtermaterialalters sowie unterschiedlicher Betriebsweisen und technischer Ausstattungen auf die Abscheidegrade an Ammoniak und Geruch zu untersuchen, wurden Versuche an zwei Biofiltern durchgeführt. Im Vergleich zur ersten Messperiode mit einem 6,5 Jahre alten Filtermaterial zeigten sich nach einjähriger Nutzung des neuen Filtermaterials bei diesem keine deutlich höheren Abscheideleistungen mehr. Eine Erhöhung der Filtermaterialfeuchte hatte erst bei stark ansteigenden Filterbelastungen einen positiven Einfluss auf den Abscheidegrad an Ammoniak. Der Einsatz einer zusätzlichen Vorkonditionierung der Rohluft mithilfe von Sprühwäschern zeigte keinen positiven Effekt auf die Abscheideleistungen an Ammoniak und Geruch. Durch den Aufbau und Betrieb der untersuchten Biofilteranlage entstanden Gesamtkosten in einem Bereich von 12 bis 15 DM pro Mastschwein.
description: LANDTECHNIK, Bd. 53 Nr. 2 (1998)
Lärmprobleme in der Landwirtschaft
Creators: name: Mantel, Juval
Publisher: name: LANDTECHNIK
Year: 1998

description: Landwirtschaftliche und Wohnbereiche rücken aneinander heran. Die sich dadurch ergebenden Lärmprobleme für die Nachbarn von landwirtschaftlichen Anwesen rühren von der Tierhaltung, festen Anlagen und beweglichen landwirtschaftlichen Maschinen her. Auch die saisonalen Probleme sind für die Landwirtschaft charakteristisch, sodass eine strenge Handhabung nach den Gesichtspunkten des gewerblichen Lärms modifiziert werden muss.
description: LANDTECHNIK, Bd. 53 Nr. 2 (1998)
Rechenmodell für die NH3-Emission aus Festmist
Creators: name: Krötz, Wieland
name: Englert, Gerhard
Publisher: name: LANDTECHNIK
Year: 1998

description: Ausgangspunkte für verfahrenstechnische Maßnahmen zur Verringerung der NH3-Emission aus Festmist sind die für die Emission maßgebenden Einflussgrößen. Um diese ermitteln zu können, wurde als Forschungsansatz die Bildung eines System Rechenmodells gewählt. Der vorliegende Beitrag stellt die Konzeption dieses Rechenmodells und erste Ergebnisse bei der Ermittlung von Stoffkennwerten des Festmistes vor.
description: LANDTECHNIK, Bd. 53 Nr. 2 (1998)
Die Weihenstephaner Trennhacke
Creators: name: Meyer, Joachim
name: Weber, Hansjörg
Publisher: name: LANDTECHNIK
Year: 1998

description: Das neuartige Gerätekonzept zur Unkrautregulierung kombiniert gezogene und angetriebene Werkzeuge. Breite Gänsefußschare unterschneiden die Unkrautpflanzen und werfen die Erde auf rotierende Federzinken, greifen in den aufgeworfenen Erdstrom ein, trennen die Erde von den Wurzeln und legen die Unkräuter auf der Erdoberfläche mulchartig ab. Das Gerät arbeitet weitgehend unabhängig von Bodenart und Bodenfeuchte, ist bei hohen Arbeitsgeschwindigkeiten einsetzbar und kann auch große Unkräuter abtöten. Es wurde unterunterschiedlichste Bedingungen hinsichtlich Regulierungserfolg, Flächenleistung, Einsatzgrenzen und Bodenschonung untersucht.
description: LANDTECHNIK, Bd. 53 Nr. 2 (1998)
Inplace knowledge distillation with teacher assistant for improved training of flexible deep neural networks
Creators: name: Ozerov, Alexey
name: Duong, Ngoc
Publisher: name: arXiv
Year: 2021
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Deep neural networks (DNNs) have achieved great success in various machine learning tasks. However, most existing powerful DNN models are computationally expensive and memory demanding, hindering their deployment in devices with low memory and computational resources or in applications with strict latency requirements. Thus, several resource-adaptable or flexible approaches were recently proposed that train at the same time a big model and several resource-specific sub-models. Inplace knowledge distillation (IPKD) became a popular method to train those models and consists in distilling the knowledge from a larger model (teacher) to all other sub-models (students). In this work a novel generic training method called IPKD with teacher assistant (IPKD-TA) is introduced, where sub-models themselves become teacher assistants teaching smaller sub-models. We evaluated the proposed IPKD-TA training method using two state-of-the-art flexible models (MSDNet and Slimmable MobileNet-V1) with two popular image classification benchmarks (CIFAR-10 and CIFAR-100). Our results demonstrate that the IPKD-TA is on par with the existing state of the art while improving it in most cases.
Dynamical generalization of a solvable family of two-electron model atoms with general interparticle repulsion
Creators: name: Niehaus, T. A.
name: Suhai, S.
name: March, N. H.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Holas, Howard and March [Phys. Lett. A {\bf 310}, 451 (2003)] have obtained analytic solutions for ground-state properties of a whole family of two-electron spin-compensated harmonically confined model atoms whose different members are characterized by a specific interparticle potential energy u($r_{12}$). Here, we make a start on the dynamic generalization of the harmonic external potential, the motivation being the serious criticism levelled recently against the foundations of time-dependent density-functional theory (e.g. [J. Schirmer and A. Dreuw, Phys. Rev. A {\bf 75}, 022513 (2007)]). In this context, we derive a simplified expression for the time-dependent electron density for arbitrary interparticle interaction, which is fully determined by an one-dimensional non-interacting Hamiltonian. Moreover, a closed solution for the momentum space density in the Moshinsky model is obtained.
description: 5 pages, submitted to J. Phys. A
Solving smooth min-min and min-max problems by mixed oracle algorithms
Creators: name: Gladin, Egor
name: Sadiev, Abdurakhmon
name: Gasnikov, Alexander
name: Dvurechensky, Pavel
name: Beznosikov, Aleksandr
name: Alkousa, Mohammad
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: In this paper, we consider two types of problems that have some similarity in their structure, namely, min-min problems and min-max saddle-point problems. Our approach is based on considering the outer minimization problem as a minimization problem with inexact oracle. This inexact oracle is calculated via inexact solution of the inner problem, which is either minimization or a maximization problem. Our main assumptions are that the problem is smooth and the available oracle is mixed: it is only possible to evaluate the gradient w.r.t. the outer block of variables which corresponds to the outer minimization problem, whereas for the inner problem only zeroth-order oracle is available. To solve the inner problem we use accelerated gradient-free method with zeroth-order oracle. To solve the outer problem we use either inexact variant of Vaydya's cutting-plane method or a variant of accelerated gradient method. As a result, we propose a framework that leads to non-asymptotic complexity bounds for both min-min and min-max problems. Moreover, we estimate separately the number of first- and zeroth-order oracle calls which are sufficient to reach any desired accuracy.
Structure and Magnetism of HoBaCo2O5+delta Layered Cobaltites with 0.02
Creators: name: Malavasi, Lorenzo
name: Diaz-Fernandez, Yuri
name: Mozzati, M. Cristina
name: Ritter, Clemens
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In this paper we have studied, by means of high-resolution neutron powder diffraction and magnetic susceptibility, the structural and magnetic features of selected samples of the HoBaCo2O5+delta layered cobaltite in the low oxygen content range (0.02
description: 16 pages, 4 figures, submitted to Solid State Comm
Bewässerungssteuerung
Creators: name: Sourell, Heinz
name: Schmitz, Martin
Publisher: name: LANDTECHNIK
Year: 1998

description: Zeitpunkt und Höhe der Bewässerungsgabe spielen eine entscheidende Rolle für die Ertragsstabilität und -qualität, aber auch für die mögliche Wassereinsparung. Es werden verschiedene Bodenfeuchtemessverfahren diskutiert, mit denen eine Bewässerungssteuerung möglich wäre. Die Ergebnisse zeigen die Spannweite verschiedener Sensoren. ln einem Bewertungsrahmen werden die verschiedenen Sensoren mit ihren Kenndaten gegenübergestellt.
description: LANDTECHNIK, Bd. 53 Nr. 2 (1998)
Assesing the mediating effect of Self Control on the relationship betweeen Perceived Ease of Use of E-money on Consumptive Behavior and Internet Gaming Disorder of generation Z (Empirical Evidences from Indonesia)
Creators: name: firmialy, sita
Publisher: name: figshare
Year: 2021
Subjects: Economics

description: Assesing the mediating effect of Self Control on the relationship betweeen Perceived Ease of Use of E-money on Consumptive Behavior and Internet Gaming Disorder of generation Z (Empirical Evidences from Indonesia)
Normal state of highly polarized Fermi gases: Full many-body treatment
Creators: name: Combescot, R.
name: Giraud, S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We consider a single \down atom within a Fermi sea of \up atoms. We elucidate by a full many-body analysis the quite mysterious agreement between Monte-Carlo results and approximate calculations taking only into account single particle-hole excitations. It results from a nearly perfect destructive interference of the contributions of states with more than one particle-hole pair. This is linked to the remarkable efficiency of the expansion in powers of hole wavevectors, the lowest order leading to perfect interference. Going up to two particle-hole pairs gives an essentially perfect agreement with known exact results. Hence our treatment amounts to an exact solution of this problem.
description: 5 pages, 1 figure
Rübenernte
Creators: name: Wilde, Thomas
Publisher: name: LANDTECHNIK
Year: 1998

description: Ungünstige Witterungsverhältnisse und steigende Fahrzeugmassen in der Rübenernte werden hinsichtlich der Auswirkung auf den Boden kritisch diskutiert. Dargestellt werden Messungen zu sechsreihigen Rübenrodern und zu Transportfahrzeugen während der Rübenernte. Die Wirkung des Fahrens in der selben Spur sowie das spurversetzte Befahren der Fläche werden untersucht.
description: LANDTECHNIK, Bd. 53 Nr. 2 (1998)
Automated Creative Optimization for E-Commerce Advertising
Creators: name: Chen, Jin
name: Xu, Ju
name: Jiang, Gangwei
name: Ge, Tiezheng
name: Zhang, Zhiqiang
name: Lian, Defu
name: Zheng, Kai
Publisher: name: arXiv
Year: 2021
Subjects: subject: Information Retrieval (cs.IR)
subject: FOS: Computer and information sciences

description: Advertising creatives are ubiquitous in E-commerce advertisements and aesthetic creatives may improve the click-through rate (CTR) of the products. Nowadays smart advertisement platforms provide the function of compositing creatives based on source materials provided by advertisers. Since a great number of creatives can be generated, it is difficult to accurately predict their CTR given a limited amount of feedback. Factorization machine (FM), which models inner product interaction between features, can be applied for the CTR prediction of creatives. However, interactions between creative elements may be more complex than the inner product, and the FM-estimated CTR may be of high variance due to limited feedback. To address these two issues, we propose an Automated Creative Optimization (AutoCO) framework to model complex interaction between creative elements and to balance between exploration and exploitation. Specifically, motivated by AutoML, we propose one-shot search algorithms for searching effective interaction functions between elements. We then develop stochastic variational inference to estimate the posterior distribution of parameters based on the reparameterization trick, and apply Thompson Sampling for efficiently exploring potentially better creatives. We evaluate the proposed method with both a synthetic dataset and two public datasets. The experimental results show our method can outperform competing baselines with respect to cumulative regret. The online A/B test shows our method leads to a 7 increase in CTR compared to the baseline.
description: 10 pages, 5 figures, the Web Conference 2021
Il contratto gratuito atipico e prassi negoziale
Creators: name: Arlotta, Antonio
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2006

description: Con il presente lavoro si è cercato di chiarire la nozione giuridica di "gratuità", diversificandola tanto dall'onerosità, quanto dalla liberalità. Una volta chiarito il fondamento causale degli atti gratuiti (categoria che ricomprende i soli atti  che, malgrado privi di corrispettivo, siano giustificati causalmente dal perseguimento di interessi economici) si è cercato di dare cittadinanza giuridica ai negozi gratuiti atipici ad effetto reale.
Si è ritenuto opportuno soffermare l’attenzione sulla delicata questione relativa alla tradizionale propensione giurisprudenziale a negare che spostamenti giuridico-patrimoniali non possano trovare fondamento in fattispecie esulanti dall'alternativa contratto di scambio-negozio donativo e, per conseguenza, ad escludere o ridimensionare in modo drastico la possibile sfera di operatività di fattispecie gratuite non codificate. Infatti, pur essendo oramai pacifica la possibilità di concludere contratti atipici ad effetti reali, la giurisprudenza tende a negare che atti ad effetti reali possano trovare fondamento in fattispecie esulanti dall’alternativa contratto di scambio-negozio donativo e, per conseguenza, ad escludere o a comprimere fortemente l’area di operatività di fattispecie gratuite non codificate.
Attraverso l'analisi di alcune diffuse prassi negoziali, del resto, si è rilevato la presenza di svariate ipotesi di spostamenti patrimoniali non onerosi ma non caratterizzati dallo spirito di liberalità ma da interessi economici. Si possono ricordare gli omaggi-premio, la diffusione gratuita di giornali o di campioni di prodotti, il trasferimento gratuito di calciatori.
Minori perplessità hanno suscitato le stipulazioni gratuite afferenti ad obblighi di facere: tra queste si sono analizzate le lettere di patronage, il contratto di sponsorizzazione ed alcune offerte promozionali.
Per quanto riguarda il contratto di sponsorizzazione, si è avuto modo di affrontare la natura della c.d. "sponsorizzazione interna", che obbliga lo sponsorizzato ad un pati: tale ipotesi pare non potersi qualificare gratuita, in quanto un simile obbligo non può non colorare la causa negoziale, tanto ciò vero che il suo inadempimento comporta la risoluzione del contratto e l'eventuale obbligo di risarcire i danni provocati allo sponsor.
Spacetime Emergence in the Robertson-Walker Universe from a Matrix model
Creators: name: Erdmenger, Johanna
name: Meyer, Rene
name: Park, Jeong-Hyuck
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Using a novel, string theory-inspired formalism based on a Hamiltonian constraint, we obtain a conformal mechanical system for the spatially flat four-dimensional Robertson-Walker Universe. Depending on parameter choices, this system describes either a relativistic particle in the Robertson-Walker background, or metric fluctuations of the Robertson-Walker geometry. Moreover we derive a tree-level M-theory matrix model in this time-dependent background. Imposing the Hamiltonian constraint forces the spacetime geometry to be fuzzy near the big bang, while the classical Robertson-Walker geometry emerges as the Universe expands. From our approach we also derive the temperature of the Universe interpolating between the radiation and matter dominated eras.
description: 4 pages - accepted for publication in Physical Review Letters
A model study on superfluidity of a unitary Fermi gas of atoms interacting with a finite-ranged potential
Creators: name: Mal, Subhanka
name: Deb, Bimalendu
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We calculate Bardeen-Cooper-Schrieffer (BCS) state of a unitary Fermi gas of atoms interacting with the finite-ranged Jost-Kohn potential which has been recently shown to account for the resonant interactions [2019 {\rm J. Phys. B: At. Mol. Opt. Phys.} {\bf 52}, 165004]. Using exact scattering solution of the potential, we derive two-body ${\mathbf T}$-matrix element which is employed to construct the BCS Hamiltonian in momentum space. We present results on the energy- and range-dependence of the pairing gap and superfluid density and the range-dependence of the chemical potential for a wide variation of the scattering length including the unitary regime. In the zero range limit our calculated gap at the Fermi energy is found to be nearly equal to that calculated in mean-field theory with contact potential. The mean gap averaged over the full width at half maximum of the gap function in the zero range and unitary limits is found to be $0.42 E_F$ which is quite close to the recent result of the quantum Monte Carlo simulation [2018 {\rm Phys. Rev.A} {\bf 97}, 013601]. The chemical potential in the zero range limit also agrees well with that for the contact potential.
description: 9 pages, 5 figures
Gravitational waves and dragging effects
Creators: name: Bicak, Jiri
name: Katz, Joseph
name: Lynden-Bell, Donald
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Linear and rotational dragging effects of gravitational waves on local inertial frames are studied in purely vacuum spacetimes. First the linear dragging caused by a simple cylindrical pulse is investigated. Surprisingly strong transversal effects of the pulse are exhibited. The angular momentum in cylindrically symmetric spacetimes is then defined and confronted with some results in literature. In the main part, the general procedure is developed for studying weak gravitational waves with translational but not axial symmetry which can carry angular momentum. After a suitable averaging the rotation of local inertial frames due to such rotating waves can be calculated explicitly and illustrated graphically. This is done in detail in the accompanying paper. Finally, the rotational dragging is given for strong cylindrical waves interacting with a rotating cosmic string with a small angular momentum.
description: Scheduled to appear in Class. Quantum Grav. July 2008