cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Matchgates and classical simulation of quantum circuits
Creators: name: Jozsa, Richard
name: Miyake, Akimasa
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Let G(A,B) denote the 2-qubit gate which acts as the 1-qubit SU(2) gates A and B in the even and odd parity subspaces respectively, of two qubits. Using a Clifford algebra formalism we show that arbitrary uniform families of circuits of these gates, restricted to act only on nearest neighbour (n.n.) qubit lines, can be classically efficiently simulated. This reproduces a result originally proved by Valiant using his matchgate formalism, and subsequently related by others to free fermionic physics. We further show that if the n.n. condition is slightly relaxed, to allowing the same gates to act only on n.n. and next-n.n. qubit lines, then the resulting circuits can efficiently perform universal quantum computation. From this point of view, the gap between efficient classical and quantum computational power is bridged by a very modest use of a seemingly innocuous resource (qubit swapping). We also extend the simulation result above in various ways. In particular, by exploiting properties of Clifford operations in conjunction with the Jordan-Wigner representation of a Clifford algebra, we show how one may generalise the simulation result above to provide further classes of classically efficiently simulatable quantum circuits, which we call Gaussian quantum circuits.
description: 18 pages, 2 figures
Reducing FEC-Complexity in Cross-Layer Predictable Data Communication
Creators: name: Pereira, Pablo Gil
name: Herfet, Thorsten
Publisher: name: arXiv
Year: 2022
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: The PRRT protocol enables applications with strict performance requirements such as Cyber-Physical Systems, as it provides predictably low, end-to-end delay via cross-layer pacing and timely error correction via Hybrid ARQ (HARQ). However, the implemented HARQ uses computationally complex Maximum Distance Separable (MDS) codes to generate redundancy. In this paper we propose code partitioning for the complexity reduction of MDS codes, thereby enabling their deployment on constrained embedded devices.
Estimating IDF Curves Consistently over Durations with Spatial Covariates
Creators: name: Ulrich, Jana
name: Jurado, Oscar E.
name: Peter, Madlen
name: Scheibel, Marc
name: Rust, Henning W.
Publisher: name: Freie Universität Berlin
Year: 2020
Subjects: subject: extreme value statistics
subject: extreme precipitation
subject: subdaily precipitation extremes
subject: intensity-duration-frequency curve
subject: duration-dependent GEV
subject: vector generalized linear model
subject: spatial covariates
subject: 500 Naturwissenschaften und Mathematik::550 Geowissenschaften, Geologie::551 Geologie, Hydrologie, Meteorologie

description: Given that long time series for temporally highly resolved precipitation observations are rarely available, it is necessary to pool information to obtain reliable estimates of the distribution of extreme precipitation, especially for short durations. In this study, we use a duration-dependent generalized extreme value distribution (d-GEV) with orthogonal polynomials of longitude and latitude as spatial covariates, allowing us to pool information between durations and stations. We determine the polynomial orders with step-wise forward regression and cross-validated likelihood as a model selection criterion. The Wupper River catchment in the West of Germany serves as a case study area. It allows us to estimate return level maps for arbitrary durations, as well as intensity-duration-frequency curves at any location—also ungauged—in the research area. The main focus of the study is evaluating the model performance in detail using the Quantile Skill Index, a measure derived from the popular Quantile Skill Score. We find that the d-GEV with spatial covariates is an improvement for the modeling of rare events. However, the model shows limitations concerning the modeling of short durations d≤30min. For ungauged sites, the model performs on average as good as a generalized extreme value distribution with parameters estimated individually at the gauged stations with observation time series of 30–35 years available.
Dynamic noncommutative BTZ black holes
Creators: name: Ankur
name: Dey, Sanjib
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We have studied the charged BTZ black holes in noncommutative spaces arising from two independent approaches. First, by using the Seiberg-Witten map followed by a dynamic choice of gauge in the Chern-Simons gauge theory. Second, by inducing the fuzziness in the mass and charge by a Lorentzian distribution function with the width being the same as the minimal length of the associated noncommutativity. In the first approach, we have found the existence of non-static and non-stationary BTZ black holes in noncommutative spaces for the first time in the literature, while the second approach facilitates us to introduce a proper bound on the noncommutative parameter so that the corresponding black hole becomes stable and physical. We have used a contemporary tunneling formalism to study the thermodynamics of the black holes arising from both of the approaches and analyze their behavior within the context.
description: 16 pages, 5 figures
Determination of the Ovarian Stages in Wild Persian Sturgeon, Acipenser persicus
Creators: name: Mahboubeh HOSSENZADE, Mohammad Reza IMANPOOR
Publisher: name: Walailak University
Year: 2014
Subjects: Acipenser persicus, histological experiment, gonadosomatic index (GSI), maturity stages, Caspian Sea

description: 10, 11, Walailak Journal of Science and Technology
Experimental Validation of a Dynamic Equivalent Model for Microgrids
Creators: name: Conte, F.
name: D'Agostino, F.
name: Massucco, S.
name: Silvestro, F.
name: Bossi, C.
name: Cabiati, M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The goal of this paper is the experimental validation of a gray-box equivalent modeling approach applied to microgrids. The main objective of the equivalent modeling is to represent the dynamic response of a microgrid with a simplified model. The main contribution of this work is the experimental validation of a two-step process, composed by the definition of a nonlinear equivalent model with operational constraints, adapted to the microgrid environment, and the identification procedure used to define the model parameters. Once the parameters are identified, the simplified model is ready to reproduce the microgrid behavior to voltage and frequency variations, in terms of active and reactive power exchanges at the point of common coupling. To validate the proposed approach, a set of experimental tests have been carried out on a real LV microgrid considering different configurations, including both grid-connected and islanded operating conditions. Results show the effectiveness of the proposed technique and the applicability of the model to perform dynamic simulations.
description: To be published in IEEE Transactions on Industry Applications
Communication frequency response of high voltage power lines
Creators: name: Naredo V., José Luis A.
Publisher: name: University of British Columbia
Year: 2010

description: Several methods for calculating the electrical phase and modal parameters of overhead transmission lines are described in this thesis; then, a graphical method for evaluating communication frequency response of delta transmission lines -based on the guidelines given by W. H. Senn [12,13,14]- is developed. The graphical method, combined with the parameters calculation methods, obviates the need of large mainframe computers for the analysis of power line carrier (PLC) systems. A new technique for assessing coupling alternatives, based on Senn's method, is developed. The technique is applied to generate coupling recommendations; it is found that many of the current recommendations given elsewhere [21] are not reliable. Finally, future work to be done in this field is proposed.
Echo Phenomena in Large Systems of Coupled Oscillators
Creators: name: Ott, Edward
name: Platig, John H.
name: Antonsen, Thomas M.
name: Girvan, Michelle
Publisher: name: arXiv
Year: 2008
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: As exemplified by the Kuramoto model, large systems of coupled oscillators may undergo a transition to phase coherence with increasing coupling strength. It is shown that below the critical coupling strength for this transition such systems may be expected to exhibit `echo' phenomena: a stimulation by two successive pulses separated by a time interval tau leads to the spontaneous formation of response pulses at a time tau, 2 tau, 3 tau ..., after the second stimulus pulse. Analysis of this phenomenon, as well as illustrative numerical experiments, are presented. The theoretical significance and potential uses of echoes in such systems are discussed.
description: 23 pages, 7 figures
X-ray polarimetry of the Crab nebula with PolarLight: polarization recovery after the glitch and a secular position angle variation
Creators: name: Long, Xiangyun
name: Feng, Hua
name: Li, Hong
name: Zhu, Jiahuan
name: Wu, Qiong
name: Huang, Jiahui
name: Minuti, Massimo
name: Jiang, Weichun
name: Wang, Weihua
name: Xu, Renxin
name: Costa, Enrico
name: Yang, Dongxin
name: Citraro, Saverio
name: Nasimi, Hikmat
name: Yu, Jiandong
name: Jin, Ge
name: Zeng, Ming
name: An, Peng
name: Baldini, Luca
name: Bellazzini, Ronaldo
name: Brez, Alessandro
name: Latronico, Luca
name: Sgro, Carmelo
name: Spandre, Gloria
name: Pinchera, Michele
name: Muleri, Fabio
name: Soffitta, Paolo
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We report follow-up observations of the Crab nebula with the PolarLight X-ray polarimeter, which revealed a possible variation in polarization associated with a pulsar glitch in 2019. The new observations confirm that the polarization has recovered roughly 100 days after the glitch. With the new observations, we find that the polarization angle (PA) measured with PolarLight from the total nebular emission has a difference of 18.0 +- 4.6 (deg) from that measured 42 years ago with OSO-8, indicating a secular evolution of polarization with either the Crab nebula or pulsar. The long-term variation in PA could be a result of multiple glitches in the history, magnetic reconnection or movement of synchrotron emitting structures in the nebula, or secular evolution of the pulsar magnetic geometry.
description: ApJ Letters to appear
Nanotherapeutic Modulation of Human Neural Cells and Glioblastoma in Organoids and Monocultures
Creators: name: Zhang, Issan
name: Lépine, Paula
name: Han, Chanshuai
name: Lacalle-Aurioles, María
name: Chen, Carol X.-Q.
name: Haag, Rainer
name: Durcan, Thomas M.
name: Maysinger, Dusica
Publisher: name: Freie Universität Berlin
Year: 2020
Subjects: subject: cerebral organoids
subject: nanomedicines
subject: astrocytes
subject: microglia
subject: glioblastoma
subject: lipocalin-2
subject: inflammation
subject: 500 Naturwissenschaften und Mathematik::540 Chemie::540 Chemie und zugeordnete Wissenschaften
subject: 600 Technik, Medizin, angewandte Wissenschaften::610 Medizin und Gesundheit::616 Krankheiten

description: Inflammatory processes in the brain are orchestrated by microglia and astrocytes in response to activators such as pathogen-associated molecular patterns, danger-associated molecular patterns and some nanostructures. Microglia are the primary immune responders in the brain and initiate responses amplified by astrocytes through intercellular signaling. Intercellular communication between neural cells can be studied in cerebral organoids, co-cultures or in vivo. We used human cerebral organoids and glioblastoma co-cultures to study glia modulation by dendritic polyglycerol sulfate (dPGS). dPGS is an extensively studied nanostructure with inherent anti-inflammatory properties. Under inflammatory conditions, lipocalin-2 levels in astrocytes are markedly increased and indirectly enhanced by soluble factors released from hyperactive microglia. dPGS is an effective anti-inflammatory modulator of these markers. Our results show that dPGS can enter neural cells in cerebral organoids and glial cells in monocultures in a time-dependent manner. dPGS markedly reduces lipocalin-2 abundance in the neural cells. Glioblastoma tumoroids of astrocytic origin respond to activated microglia with enhanced invasiveness, whereas conditioned media from dPGS-treated microglia reduce tumoroid invasiveness. Considering that many nanostructures have only been tested in cancer cells and rodent models, experiments in human 3D cerebral organoids and co-cultures are complementary in vitro models to evaluate nanotherapeutics in the pre-clinical setting. Thoroughly characterized organoids and standardized procedures for their preparation are prerequisites to gain information of translational value in nanomedicine. This study provides data for a well-characterized dendrimer (dPGS) that modulates the activation state of human microglia implicated in brain tumor invasiveness.
Study on Physical Properties of Inx Se1-x Thin Films Synthesized by Vacuum Evaporation Method
Creators: name: Mahdi Hasan SUHAIL, Issam Mohammed IBRAHIM
Publisher: name: Walailak University
Year: 2014
Subjects: Indium Selenide, vacuum evaporation, annealing, energy gap, optical constants

description: 9, 11, Walailak Journal of Science and Technology
Entanglement of positive definite functions on compact groups
Creators: name: Korbicz, J. K.
name: Wehr, J.
name: Lewenstein, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We define and study entanglement of continuous positive definite functions on products of compact groups. We formulate and prove an infinite-dimensional analog of Horodecki Theorem, giving a necessary and sufficient criterion for separability of such functions. The resulting characterisation is given in terms of mappings of the space of continuous functions, preserving positive definiteness. The relation between the developed group-theoretical formalism and the conventional one, given in terms of density matrices, is established through the non-commutative Fourier analysis.
description: published version
Bactericidal Action of E. coli Mediated Nanoparticle Coated Medical Dressings
Creators: name: Akhilesh UPGADE, Prabhu NAGARAJAN
Publisher: name: Walailak University
Year: 2014
Subjects: Wound care management, silver nanoparticles, silver coated dressings, antibacterial activity

description: 9, 11, Walailak Journal of Science and Technology
title: Linked linear mixed models
title: a joint analysis of fixation locations and fixation durations in natural reading
titleType: Subtitle
Creators: name: Hohenstein, Sven
name: Matuschek, Hannes
name: Kliegl, Reinhold
Publisher: name: Universität Potsdam
Year: 2019

description: The complexity of eye-movement control during reading allows measurement of many dependent variables, the most prominent ones being fixation durations and their locations in words. In current practice, either variable may serve as dependent variable or covariate for the other in linear mixed models (LMMs) featuring also psycholinguistic covariates of word recognition and sentence comprehension. Rather than analyzing fixation location and duration with separate LMMs, we propose linking the two according to their sequential dependency. Specifically, we include predicted fixation location (estimated in the first LMM from psycholinguistic covariates) and its associated residual fixation location as covariates in the second, fixation-duration LMM. This linked LMM affords a distinction between direct and indirect effects (mediated through fixation location) of psycholinguistic covariates on fixation durations. Results confirm the robustness of distributed processing in the perceptual span. They also offer a resolution of the paradox of the inverted optimal viewing position (IOVP) effect (i.e., longer fixation durations in the center than at the beginning and end of words) although the opposite (i.e., an OVP effect) is predicted from default assumptions of psycholinguistic processing efficiency: The IOVP effect in fixation durations is due to the residual fixation-location covariate, presumably driven primarily by saccadic error, and the OVP effect (at least the left part of it) is uncovered with the predicted fixation-location covariate, capturing the indirect effects of psycholinguistic covariates. We expect that linked LMMs will be useful for the analysis of other dynamically related multiple outcomes, a conundrum of most psychonomic research.
description: Postprints der Universität Potsdam : Humanwissenschaftliche Reihe, 552
Relative field line helicity of a large eruptive solar active region
Creators: name: Moraitis, K.
name: Patsourakos, S.
name: Nindos, A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Context. Magnetic helicity is a physical quantity of great importance in the study of astrophysical and natural plasmas. Although a density for helicity cannot be defined, a good proxy for it is field line helicity. The appropriate quantity for use in solar conditions is relative field line helicity (RFLH). Aims. This work aims to study in detail the behaviour of RFLH, for the first time, in a solar active region (AR). Methods. The target active region is the large, eruptive AR 11158. In order to compute RFLH and all other quantities of interest we use a non-linear force-free reconstruction of the AR coronal magnetic field of excelent quality. Results. We find that the photospheric morphology of RFLH is quite different than that of the magnetic field or of the electrical current, and this is not sensitive to the chosen gauge in the computation of RFLH. The value of helicity experiences a large decrease, 25% of its pre-flare value, during an X-class flare of the AR, a change that is also depicted in the photospheric morphology of RFLH. Moreover, the area of this change coincides with the area that encompasses the flux rope, the magnetic structure that later erupted. Conclusions. The use of RFLH can provide important information about the value and location of the magnetic helicity expelled from the solar atmosphere during eruptive events.
description: accepted by Astronomy & Astrophysics
Revisiting Brucellosis in Small Ruminants of Western Border Areas in Pakistan
Creators: name: Jamil, Tariq
name: Kasi, Khushal Khan
name: Melzer, Falk
name: Saqib, Muhammad
name: Ullah, Qudrat
name: Khan, Muhammad Roidar
name: Dadar, Maryam
name: Tayyab, Muhammad Haleem
name: Schwarz, Stefan
name: Neubauer, Heinrich
Publisher: name: Freie Universität Berlin
Year: 2020
Subjects: subject: Brucellosis
subject: zoonosis
subject: Baluchistan
subject: KPK
subject: Pakistan
subject: 600 Technik, Medizin, angewandte Wissenschaften::610 Medizin und Gesundheit::616 Krankheiten
subject: 600 Technik, Medizin, angewandte Wissenschaften::630 Landwirtschaft::630 Landwirtschaft und verwandte Bereiche

description: Brucellosis, globally known bacterial zoonosis, is endemic to Pakistan. B. abortus in bovines, B. melitensis in small ruminants and B. canis in dogs mainly cause this disease. A total of 1821 sera (1196 from sheep and 625 from goats) from animal herds near the Pakistan–Afghanistan border were collected. In parallel testing of sera for anti-Brucella antibodies (B. abortus and B. melitensis) was carried out by RBPT and indirect ELISA. The presence of Brucella DNA in sera was tested by real-time PCR. The overall percentage of seropositive samples was 0.99 (18/1821) by both tests. All positive samples originated from Baluchistan territory which translated into 1.76% (18/1021). None of the positive sera had signals for Brucella DNA and none of sera from goats carried detectable antibodies. Both tests showed an almost perfect agreement with Kappa statistics. The flock size was found to be associated with the presence of anti-Brucella antibodies. The samples of Khyber Pakhtunkhwa (KPK) tested negative in both serological tests and hence were not processed for real-time PCR. The present study shows the presence of anti-Brucella antibodies in sheep in the Baluchistan region of Pakistan. Diagnostic services need to be improved and test and slaughter policies might be implemented for eradication of Brucella infection in these areas. Awareness about the infection is needed at the farmer’s level. Isolation and molecular biology of the isolates could help with understanding the prevailing etiology in a better way.
Non-universal scalar masses: a signal-based analysis for the Large Hadron Collider
Creators: name: Bhattacharya, Subhaditya
name: Datta, AseshKrishna
name: Mukhopadhyaya, Biswarup
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the possible signatures of non-universal scalar masses in supersymmetry at the Large Hadron Collider (LHC). This is done, following our recent study on gaugino non-universality, via a multichannel analysis, based largely on the ratios of event rates for different final states, aimed at minimizing irregularity in the pattern due to extraneous effects and errors. We have studied (a) squark-slepton non-universality, (b) non-universality in sfermion masses of the third family, (c) the effects of $SO(10) D$-terms in supersymmetric Grand Unified Theories. After presenting an elaborate numerical analysis of like- and opposite-sign dileptons, inclusive and hadronically quiet trileptons as well as inclusive jet final states, we point out specific features of the spectrum in each case, which can be differentiated in the above channels from the spectrum for a minimal supergravity scenario with a universal scalar mass at high scale. The event selection criteria, and the situations where the signals are sizable enough for a comparatve study, are also delineated. It is found that, with some exceptions, the trilepton channels are likely to be especially useful for this purpose.
description: 30 pages, 8 figures
Dynamical transition, hydrophobic interface, and the temperature dependence of electrostatic fluctuations in proteins
Creators: name: LeBard, David N.
name: Matyushov, Dmitry V.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Molecular dynamics simulations have revealed a dramatic increase, with increasing temperature, of the amplitude of electrostatic fluctuations caused by water at the active site of metalloprotein plastocyanin. The increased breadth of electrostatic fluctuations, expressed in terms of the reorganization energy of changing the redox state of the protein, is related to the formation of the hydrophobic protein/water interface allowing large-amplitude collective fluctuations of the water density in the protein's first solvation shell. On the top of the monotonic increase of the reorganization energy with increasing temperature, we have observed a spike at 220 K also accompanied by a significant slowing of the exponential collective Stokes shift dynamics. In contrast to the local density fluctuations of the hydration-shell waters, these spikes might be related to the global property of the water solvent crossing the Widom line.
description: 9 pages, 8 figures
title: Ocular drift along the mental number line
Creators: name: Myachykov, Andriy
name: Ellis, Rob
name: Cangelosi, Angelo
name: Fischer, Martin H.
Publisher: name: Universität Potsdam
Year: 2019

description: We examined the spontaneous association between numbers and space by documenting attention deployment and the time course of associated spatial-numerical mapping with and without overt oculomotor responses. In Experiment 1, participants maintained central fixation while listening to number names. In Experiment 2, they made horizontal target-direct saccades following auditory number presentation. In both experiments, we continuously measured spontaneous ocular drift in horizontal space during and after number presentation. Experiment 2 also measured visual-probe-directed saccades following number presentation. Reliable ocular drift congruent with a horizontal mental number line emerged during and after number presentation in both experiments. Our results provide new evidence for the implicit and automatic nature of the oculomotor resonance effect associated with the horizontal spatial-numerical mapping mechanism.
description: Postprints der Universität Potsdam : Humanwissenschaftliche Reihe, 553
Optical, luminescence, and scintillation properties of advanced ZnWO$_4$ crystal scintillators
Creators: name: Belli, P.
name: Bernabei, R.
name: Borovlev, Yu. A.
name: Cappella, F.
name: Caracciolo, V.
name: Cerulli, R.
name: Danevich, F. A.
name: Degoda, V. Ya.
name: Incicchitti, A.
name: Kasperovych, D. V.
name: Kogut, Ya. P.
name: Leoncini, A.
name: Podust, G. P.
name: Postupaeva, A. G.
name: Shlegel, V. N.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Zinc tungstate (ZnWO$_4$) crystal scintillators are promising detection material for the experiments searching for double beta decay, dark matter, and investigating rare alpha decays. An extended R&D was performed to develop advanced quality ZnWO$_4$ crystal scintillators. The R&D programme included the selection of the initial materials, the variation of the compound stoichiometry, the application of single and double crystallization, and the annealing of the crystal boules. The optical transmittance of the produced boules was measured, and the luminescence under X-ray excitation in the temperature region from 85 K to room temperature was studied (thermally stimulated luminescence was measured till 350 K). The energy resolution and the relative scintillation pulse amplitude were measured with gamma-sources demonstrating high scintillation properties of the samples produced by single crystallization from deeply purified zinc and tungsten oxides, with stoichiometric composition, annealed in air atmosphere.
description: 14 pages; 10 figures
The Lorentz Integral Transform (LIT) method and its applications to perturbation induced reactions
Creators: name: Efros, V. D.
name: Leidemann, W.
name: Orlandini, G.
name: Barnea, N.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The LIT method has allowed ab initio calculations of electroweak cross sections in light nuclear systems. This review presents a description of the method from both a general and a more technical point of view, as well as a summary of the results obtained by its application. The remarkable features of the LIT approach, which make it particularly efficient in dealing with a general reaction involving continuum states, are underlined. Emphasis is given on the results obtained for electroweak cross sections of few--nucleon systems. Their implications for the present understanding of microscopic nuclear dynamics are discussed.
description: 83 pages, 31 figures. Topical review. Corrected typos
Regge conformal blocks from the Rindler-AdS black hole and the pole-skipping phenomena
Creators: name: Kim, Keun-Young
name: Lee, Kyung-Sun
name: Nishida, Mitsuhiro
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study a holographic construction of conformal blocks in the Regge limit of four-point scalar correlation functions by using coordinates of the two-sided Rindler-AdS black hole. As a generalization of geodesic Witten diagrams, we construct diagrams with four external scalar fields in the Rindler-AdS black hole by integrating over two half-geodesics between the centers of Penrose diagrams and points at the AdS boundary. We demonstrate that late-time behaviors of the diagrams coincide with the Regge behaviors of conformal blocks. We also point out their relevance with the pole-skipping phenomena by showing that the near-horizon analysis of symmetric traceless fields with any integer spin in the Rindler-AdS black hole can capture the Regge behaviors of conformal blocks.
description: 32 pages, 4 figures. v2: minor corrections, references added
De Jure Determinants of New Firm Formation: How the Pillars of Constitutions Influence Entrepreneurship
Creators: name: Carbonara, Emanuela
name: Santarelli, Enrico
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2015
Subjects: SECS-P/02 Politica economica

description: This paper provides empirical evidence supporting the view that constitutions may influence the organization of economic activities. Dealing with the issue of the institutional determinants of entrepreneurship, it shows that some of the provisions contained in national constitutions are positively and significantly associated to a standard measure of entrepreneurial dynamics, namely the rate of new business density. Using a novel dataset containing the characteristics of the constitutions enacted in the world and a sample of 115 countries, the paper finds that provisions about the right to conduct/establish a business, the right to strike, consumer protection, protection of trademarks, and education promote higher rates of new firm formation.
Evaluating the Histologic Grade of Digital Squamous Cell Carcinomas in Dogs with Dark and Light Haircoat - A Comparative Study of the Invasive Front and Tumor Cell Budding Systems
Creators: name: Cerezo-Echevarria, Argiñe
name: Grassinger, Julia M.
name: Beitzinger, Christoph
name: Klopfleisch, Robert
name: Aupperle-Lellbach, Heike
Publisher: name: Freie Universität Berlin
Year: 2020
Subjects: subject: digital squamous cell carcinoma
subject: canine
subject: cancer
subject: tumor budding
subject: digital
subject: toe
subject: squamous cell carcinoma
subject: grading
subject: 600 Technik, Medizin, angewandte Wissenschaften::630 Landwirtschaft::630 Landwirtschaft und verwandte Bereiche
subject: 600 Technik, Medizin, angewandte Wissenschaften::610 Medizin und Gesundheit::616 Krankheiten

description: Canine digital squamous cell carcinomas (CDSCC) are particularly aggressive when compared to their occurrence in other locations. Although these neoplasms are more frequently seen in dark-haired dogs, such as Giant Schnauzers, there are no data checking whether these tumors are histologically different between breeds. We histologically evaluated DSCC from 94 dogs. These were divided into two groups, namely, (1) dark-haired (N = 76) and (2) light-haired breeds (N = 18), further subdividing Group 1 into three subgroups, (1a) black breeds (n = 11), (1b) Schnauzers (n = 34) and (1c) black & tan breeds (n = 31). Adaptations from two different squamous cell carcinomas grading schemes from human and veterinary literature were used. Both systems showed significant differences when compared to Groups 1 and 2 in terms of final grade, invasive front keratinization, degree of invasion, nuclear pleomorphism, tumor cell budding, smallest tumor nest size and amount of tumor stroma. Group 2 was consistently better differentiated CDSCC than Group 1. However, there were no significant differences among the dark-haired breeds in any of the features evaluated. This study represents the first attempt to grade CDSCC while taking into account both phenotypical and presumptive genotypical haircoat color. In conclusion, CDSCC are not only more common in dark-haired dogs, they are also histologically more aggressive.
The OTELO survey: Faint end of the luminosity function of [OII] emitters at = 1.43
Creators: name: Cedrés, Bernabé
name: Bongiovanni, Ángel
name: Cerviño, Miguel
name: Nadolny, Jakub
name: Cepa, Jordi
name: de Diego, José A.
name: García, Ana María Pérez
name: Gallego, Jesús
name: Lara-López, Maritza A.
name: Sánchez-Portal, Miguel
name: González-Serrano, J. Ignacio
name: Alfaro, Emilio J.
name: Martínez, Rocío Navarro
name: Martínez, Ricardo Pérez
name: González, J. Jesús
name: Torres, Carmen P. Padilla
name: Castañeda, Héctor O.
name: González, Mauro
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: In this paper, we aim to study the main properties and luminosity function (LF) of the [OII] emitters detected in the OTELO survey in order to characterise the star formation processes in low-mass galaxies at $z\sim1.43$ and to constrain the faint-end of the LF. Here, we describe the selection method and analysis of the emitters obtained from narrow-band scanning techniques. In addition, we present several relevant properties of the emitters and discuss the selection biases and uncertainties in the determination of the LF and the star formation rate density (SFRD). We confirmed a total of 60 sources from a preliminary list of 332 candidates as [OII] emitters. Approximately 93% of the emitters have masses in the range of $10^{8}
description: 19 pages, 14 figures. Accepted in A&A
Identification of a blaVIM-1-Carrying IncA/C2 Multiresistance Plasmid in an Escherichia coli Isolate Recovered from the German Food Chain
Creators: name: Pauly, Natalie
name: Hammerl, Jens Andre
name: Grobbel, Mirjam
name: Käsbohrer, Annemarie
name: Tenhagen, Bernd-Alois
name: Malorny, Burkhard
name: Schwarz, Stefan
name: Meemken, Diana
name: Irrgang, Alexandra
Publisher: name: Freie Universität Berlin
Year: 2020
Subjects: subject: carbapenem
subject: metallo-beta-lactamase
subject: IncA/C2
subject: WGS
subject: blaVIM-1
subject: 600 Technik, Medizin, angewandte Wissenschaften::630 Landwirtschaft::636 Viehwirtschaft

description: Within the German national monitoring of zoonotic agents, antimicrobial resistance determination also targets carbapenemase-producing (CP) Escherichia coli by selective isolation from food and livestock. In this monitoring in 2019, the CP E. coli 19-AB01133 was recovered from pork shoulder. The isolate was assigned to the phylogenetic group B1 and exhibited the multi-locus sequence-type ST5869. Molecular investigations, including whole genome sequencing, of 19-AB01133 revealed that the isolate carried the resistance genes blaVIM-1, blaSHV-5 and blaCMY-13 on a self-transmissible IncA/C2 plasmid. The plasmid was closely related to the previously described VIM-1-encoding plasmid S15FP06257_p from E. coli of pork origin in Belgium. Our results indicate an occasional spread of the blaVIM-1 gene in Enterobacteriaceae of the European pig population. Moreover, the blaVIM-1 located on an IncA/C2 plasmid supports the presumption of a new, probably human source of carbapenemase-producing Enterobacteriaceae (CPE) entering the livestock and food chain sector.
Luttinger Liquid in the Core of Screw Dislocation in Helium-4
Creators: name: Boninsegni, M.
name: Kuklov, A. B.
name: Pollet, L.
name: Prokof'ev, N. V.
name: Svistunov, B. V.
name: Troyer, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: On the basis of first-principle Monte Carlo simulations we find that the screw dislocation along the hexagonal axis of an hcp He4 crystal features a superfluid core. This is the first example of a regular quasi-one-dimensional supersolid, and one of the cleanest cases of a regular Luttinger-liquid system. In contrast, the same type of screw dislocation in solid Hydrogen is insulating.
description: replaced with revised version
Unparticles in diphoton production to NLO in QCD at the LHC
Creators: name: Kumar, M. C.
name: Mathews, Prakash
name: Ravindran, V.
name: Tripathi, Anurag
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We compute to next-to-leading order in QCD the tensor unparticle contribution to the diphoton production at the LHC, wherein the unparticle sector is a consequence of (a) scale invariance but not full conformal invariance and (b) conformal invariance. We use the semi-analytical two cutoff phase space slicing method to handle the ${\cal O}(α_s)$ corrections to the $p p \to γγX$ and show that our results are insensitive to the soft and collinear cutoffs. In order to avoid the contribution of the photons due to fragmentation, we employ the smooth cone isolation criterion. Significance of the QCD corrections to the diphoton events including unparticles is highlighted.
description: 15 pages, 5 figures; replaced with version accepted for publication in PRD
Thermal fluctuations in moderately damped Josephson junctions: Multiple escape and retrapping, switching- and return-current distributions and hysteresis
Creators: name: Fenton, J. C.
name: Warburton, P. A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: A crossover at a temperature T* in the temperature dependence of the width s of the distribution of switching currents of moderately damped Josephson junctions has been reported in a number of recent publications, with positive ds/dT and IV characteristics associated with underdamped behaviour for lower temperatures TT*. We have investigated in detail the behaviour of Josephson junctions around the temperature T* by using Monte Carlo simulations including retrapping from the running state into the supercurrent state as given by the model of Ben-Jacob et al. We develop discussion of the important role of multiple escape and retrapping events in the moderate-damping regime, in particular considering the behaviour in the region close to T*. We show that the behaviour is more fully understood by considering two crossover temperatures, and that the shape of the distribution and s(T) around T*, as well as at lower T
description: Accepted for publication in PRB
The large amplitude solution of the Boltzmann equation with soft potential
Creators: name: Ko, Gyounghun
name: Lee, Donghyun
name: Park, Kwanghyuk
Publisher: name: arXiv
Year: 2021
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35Q20, 76P05

description: In this paper, we deal with (angular cut-off) Boltzmann equation with soft potential ($-3
description: 34 pages
Optimisation tools to assist efficient and sustainable tall building design
Creators: name: Bellamy, Laura
Publisher: name: Imperial College London
Year: 2019

description: Sustainability is an increasingly important factor in global decision-making, and provision of infrastructure is responsible for a substantial volume of global greenhouse gas emissions. Whilst efforts are ongoing to reduce operational carbon in the construction industry, work is still necessary to lower embodied carbon. Currently, the optimisation and design process of structures is largely based on engineers’ experience. Whilst this experience is extremely valuable and will often reach good results, making use of computational technologies that are now available could achieve improved results whilst also saving time in the design process. This could lead to more efficient designs and savings on material quantities, lowering the embodied carbon of structures. This thesis aims to develop optimisation tools for tall buildings, which are an increasingly common structural form constructed, to assist their efficient and sustainable design. The PhD project has been conducted in collaboration with industry to ensure its applicability to projects encountered in structural consultancy offices, with relevant outputs. A qualitative study has been conducted to assess the current and future place of computational engineering in the construction industry. The computational tools developed include concrete core, slab and column optimisation including sizing of core and columns, and grid layout and bracing arrangement optimisation for steel buildings including sizing optimisation. They aim to be versatile, robust and user-friendly, having been developed in an accessible, widely used software environment. They have been tested on theoretical and retrospective case studies and are now accessible to practising engineers. The engineering research presented is intended to be used in various design stages with a focus on early design stages, an area where valuable benefits both on environmental sustainability and design process efficiency can be reached. It enables engineers, in conjunction with their technical experience, to search the design space available more efficiently, to conduct analysis and optimisation and to make informed decisions earlier in the design process than would be possible with standard design methods.
Southeast Asian labyrinth : restrictive foreign investment regulatory policies of Malaysia, Thailand and Singapore from 1970 to 1980
Creators: name: Yee, Ernest
Publisher: name: University of British Columbia
Year: 2010

description: This thesis examines the levels of restrictive foreign investment regulatory policies of Malaysia, Thailand and Singapore from 1970 to 1980. The study seeks to explain why their policies varied. It presents a descriptive comparison of each country's policies restricting foreign investment. This discussion deals with general quantitative limits on foreign ownership, restrictions on certain economic sectors, restrictions on the operations of foreign-owned corporations, and the use of government-owned corporations as instruments of control over foreign investment. Based on the comparison, the study concludes that Malaysia placed greater restrictions on foreign investment than Thailand or Singapore. It is argued that differences in the domestic political and economic settings of Malaysia, Thailand and Singapore explain Malaysia's greater restrictiveness. The thesis examines each state's past experience with a colonial power, economic strategies of the political elites, domestic political pressures, and the presence of ethnic minorities. It also looks at such contributing factors as the size of the natural resource sector, the prevalence of industries with old technology, and the level of foreign ownership of industry in each country. This thesis concludes that Malaysia placed more restrictions than Thailand or Singapore because it had a very different domestic setting: an economically-dominant ethnic minority, domestic pressure for restrictions, and a nationalistic and interventionist economic strategy. Taken together, these differences explain Malaysia's greater restrictions on foreign investment. Of the explanatory variables, ethnic factors are the most important.
Spatial separation of small and large grains in the transitional disk around the young star IRS 48
Creators: name: Geers, V. C.
name: Pontoppidan, K. M.
name: van Dishoeck, E. F.
name: Dullemond, C. P.
name: Augereau, J. -C.
name: Merín, B.
name: Oliveira, I.
name: Pel, J. W.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present spatially resolved mid-infrared images of the disk surrounding the young star IRS 48 in the Ophiuchus cloud complex. The disk exhibits a ring-like structure at 18.7 micron, and is dominated by very strong emission from polycyclic aromatic hydrocarbons at shorter wavelengths. This allows a detailed study of the relative distributions of small and large dust grains. Images of IRS 48 in 5 mid-infrared bands from 8.6 to 18.7 micron as well as a low resolution N-band spectrum are obtained with VLT-VISIR. Optical spectroscopy is used to determine the spectral type of the central star and to measure the strength of the Halpha line. The 18.7 micron ring peaks at a diameter of 110 AU, with a gap of ~ 60 AU. The shape of the ring is consistent with an inclination of i = 48 +- 8 degrees. In contrast, the 7.5-13 micron PAH emission bands are centered on the source and appear to fill the gap within the ring. The measured PAH line strengths are 10-100x stronger than those typically measured for young M0 stars and can only be explained with a high PAH abundance and/or strong excess optical/UV emission. The morphology of the images, combined with the absence of a silicate emission feature, imply that the inner disk has been cleared of micron-sized dust but with a significant population of PAHs remaining. We argue that the gap can be due to grain growth and settling or to clearing by an unseen planetary or low-mass companion. IRS 48 may represent a short-lived transitional phase from a classical to a weak-line T Tauri star.
description: 4 pages, 4 figures, to be published in A&A
Stochastic Volt/VAr control of power distribution systems
Creators: name: Ul Nazir, Firdous
Publisher: name: Imperial College London
Year: 2019

description: The increasing stochasticity in the distribution networks is rendering the traditional volt/VAr control (VVC) techniques more and more ineffective because of their basic premise that the nodal net power injections are constant throughout the optimization horizon. This results in voltage magnitude excursions outside the prescribed limits when the uncertain nodal injections exhibit an appreciable variance. This thesis acknowledges the random nature of these nodal injections, load and DG outputs, and seeks to achieve VVC solutions which are feasible for most of the scenarios in real time. Thus, two novel VVC routines are proposed viz a centralized algorithm based on chance constrained programming and a distributed algorithm based on stochastic programming. The centralized chance constrained VVC problem is solved through the scenario-based approach which requires to collect large number of scenarios, making the problem computationally intractable, from the probability spaces of the random variables and ensure that the basic constraints of the original problem are satisfied for all of these scenarios. Therefore, an algorithm is proposed which only considers very small, but properly chosen, subset of the original scenarios for optimization, and at the same time guarantees that the basic constraints for every scenario are satisfied in the original scenario set. The distributed stochastic VVC problem is solved by the alternating direction method of multipliers. This method allows the problem to be solved in a decentralized fashion by dividing the whole network into various zones and equipping each zone with a local controller. A proper coordination of the local controllers ensures the final solutions are globally optimal. The developed algorithms are tested on the 95-bus UKGDS, IEEE 123-bus system and a 190- bus system. The results show the superior performance of these methods by highly reducing the voltage violations as compared to the traditional deterministic VVC routines.
Tri-bimaximal Mixing from Cascades
Creators: name: Haba, Naoyuki
name: Takahashi, Ryo
name: Tanimoto, Morimitsu
name: Yoshioka, Koichi
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study fermion mass matrices of the cascade form which are compatible with the tri-bimaximal lepton mixing and generation mass hierarchy. The flat-cascade lepton matrices imply a parameter-independent relation among the mixing angles and mass eigenvalues. The relation has several indications that the atmospheric neutrino mixing angle is close to maximal and the other two angles have a correlation independently of neutrino mass eigenvalues. We also discuss phenomenological aspects of the cascade matrices; flavor-violating rare decays of charged leptons, thermal leptogenesis, and leptonic CP violation. Possible dynamical origins of the cascades are illustrated based on flavor symmetry and in higher-dimensional theory.
description: 26 pages