cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Microwave-driven ferromagnet--topological-insulator heterostructures: The prospect for giant spin battery effect and quantized charge pump devices
Creators: name: Mahfouzi, Farzad
name: Nikolic, Branislav K.
name: Chen, Son-Hsien
name: Chang, Ching-Ray
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study heterostructures where a two-dimensional topological insulator (TI) is attached to two normal metal (NM) electrodes while an island of a ferromagnetic insulator (FI) with precessing magnetization covers a portion of its lateral edges to induce time-dependent exchange field underneath via the magnetic proximity effect. When the FI island covers both lateral edges, such device pumps pure spin current in the absence of any bias voltage, thereby acting as an efficient spin battery with giant output current even at very small microwave power input driving the precession. When only one lateral edge is covered by the FI island, both charge and spin current are pumped into the NM electrodes. We delineate conditions for the corresponding conductances (current-to-microwave-frequency ratio) to be quantized in a wide interval of precession cone angles, which is robust with respect to weak disorder and can be further extended by changes in device geometry.
description: 7 pages, 7 color figures, PDFLaTeX
Nematic spin fluid in the tetragonal phase of BaFe2As2
Creators: name: Harriger, Leland W.
name: Luo, Huiqian
name: Liu, Mengshu
name: Perring, T. G.
name: Frost, C.
name: Hu, Jiangping
name: Norman, M. R.
name: Dai, Pengcheng
Publisher: name: arXiv
Year: 2010
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Magnetic interactions are generally believed to play a key role in mediating electron pairing for superconductivity in iron arsenides; yet their character is only partially understood. Experimentally, the antiferromagnetic (AF) transition is always preceded by or coincident with a tetragonal to orthorhombic structural distortion. Although it has been suggested that this lattice distortion is driven by an electronic nematic phase, where a spontaneously generated electronic liquid crystal state breaks the C4 rotational symmetry of the paramagnetic state, experimental evidence for electronic anisotropy has been either in the low-temperature orthorhombic phase or the tetragonal phase under uniaxial pressure that breaks this symmetry. Here we use inelastic neutron scattering to demonstrate the presence of a large in-plane spin anisotropy above TN in the unstressed tetragonal phase of BaFe2As2. In the low-temperature orthorhombic phase, we find highly anisotropic spin waves with a large damping along the AF a-axis direction. On warming the system to the paramagnetic tetragonal phase, the low-energy spin waves evolve into quasi-elastic excitations, while the anisotropic spin excitations near the zone boundary persist. These results strongly suggest that the spin nematicity we find in the tetragonal phase of BaFe2As2 is the source of the electronic and orbital anisotropy observed above TN by other probes, and has profound consequences for the physics of these materials.
description: paper 20 pages, 4 figures, and supplementary info 11 pages, 7 figures
The new global politics of responsible investment
Creators: name: Balasubramanian, Priyanjali
Publisher: name: University of British Columbia
Year: 2018

description: This dissertation offers new perspectives on long-standing debates about private actors in global politics. It does so via three journal-length papers on the role of institutional investors in advancing human rights compliance by multi-national firms. The thesis innovatively bridges international relations scholarship on private authority, human rights norms and transnational advocacy, with academic work on corporate governance, responsible investment and business ethics. These disparate academic themes are unified through an empirical focus on the institutions through which responsible investment activism occurs, and how these institutions respectively inform and challenge existing conceptions of shareholder power, as a form of transnational private authority. Using comparative analysis, the first paper examines how Dutch and Norwegian pension funds responded to allegations that a Chinese state-owned firm in their portfolios was complicit in human rights violations in Sudan and Burma. In this paper, I argue that state-based institutional checks on shareholder power can affect the tactical strategies employed within investor-led human rights advocacy, and in some cases, can limit the scope for ethical deliberation on these strategic choices. The second paper maps thirty-three investor-driven governance networks to show how their institutional design choices vary significantly in the degree to which they allow for meaningful engagement with civil society. This paper argues that although the mainstreaming of responsible investment has relied heavily on a narrative of values alignment with stakeholders, governance mechanisms to incorporate stakeholders within investor activism on sustainability issues remain rare. The third paper analyses 72 shareholder proposals on the topic of global human rights filed in Canada from 1982-2017. The analysis confirms that contrary to dominant viewpoints, shareholder power is not ethically neutral. Rather, its use reinforces particular social hierarchies that do not advance global human rights, despite the appearance of doing so. The dissertation’s key contribution highlights the need for institutional adaptations to enhance the democratic qualities of global investor activism in ways that move the global business and human rights agenda towards collective publics rather than individual and private solutions. This study represents the first systematic effort to theorize and empirically evaluate shareholder power in the context of global human rights.
Green Lab: Experimenting with Sustainable Plastic Production
Creators: name: Kolla, Sai Chandan
name: KKB TECH SOLUTIONS PVT LTD
Publisher: name: Zenodo
Year: 2023

description: In the quest for environmental sustainability, the plastics industry faces significant challenges, particularly in reducing its ecological footprint. This study, titled "Green Lab: Experimenting with Sustainable Plastic Production," introduces a series of simple yet effective experiments aimed at revolutionizing plastic production to be more eco-friendly. The core objective of this research is to develop sustainable plastic materials using easily accessible, biodegradable components. The experiments involve the synthesis of bioplastics from natural polymers like starch, gelatin, and glycerol, which are readily available and environmentally benign. The process is designed to be straightforward and replicable in a basic laboratory setting, ensuring accessibility for educational and small-scale industrial applications.
Our methodology involves varying the ratios of these natural polymers and testing their effects on the physical properties of the produced plastics, such as strength, flexibility, and degradation rate. The bioplastics' characteristics are then compared with those of conventional plastics. Additionally, the study incorporates an analysis of the environmental impact of the production process, including energy consumption and waste generation. The experimental approach is complemented by the use of gas chromatography-mass spectrometry (GC-MS) to analyze the chemical composition of the produced bioplastics, ensuring a thorough understanding of their molecular structure and environmental compatibility.
The "Green Lab" project presents an innovative approach to plastic production that aligns with the principles of green chemistry. By demonstrating that sustainable plastics can be produced through simple, cost-effective methods, this research contributes to the broader goal of reducing the environmental impact of plastics and promoting sustainability in material science. This study not only provides a blueprint for sustainable plastic production but also serves as an educational tool to inspire future innovations in the field.
‘cito': an R package for training neural networks using ‘torch'
Creators: name: Amesöder, Christian
name: Hartig, Florian
name: Pichler, Maximilian
Publisher: name: Universität Regensburg
Year: 2024
Subjects: subject: classification, machine learning, R language, regression, species distribution model, causal inference, predictive modelling, deep learning
subject: 500 Naturwissenschaften
subject: 570 Biowissenschaften, Biologie
subject: 580 Pflanzen (Botanik)

description: Deep neural networks (DNN) have become a central method in ecology. To build and train DNNs in deep learning (DL) applications, most users rely on one of the major deep learning frameworks, in particular PyTorch or TensorFlow. Using these frameworks, however, requires substantial experience and time. Here, we present ‘cito', a user-friendly R package for DL that allows specifying DNNs in the familiar formula syntax used by many R packages. To fit the models, ‘cito' takes advantage of the numerically optimized ‘torch' library, including the ability to switch between training models on the CPU or the graphics processing unit (GPU) which allows the efficient training of large DNNs. Moreover, ‘cito' includes many user-friendly functions for model plotting and analysis, including explainable AI (xAI) metrics for effect sizes and variable importance. All xAI metrics as well as predictions can optionally be bootstrapped to generate confidence intervals, including p-values. To showcase a typical analysis pipeline using ‘cito', with its built-in xAI features, we built a species distribution model of the African elephant. We hope that by providing a user-friendly R framework to specify, deploy and interpret DNNs, ‘cito' will make this interesting class of models more accessible to ecological data analysis. A stable version of ‘cito' can be installed from the comprehensive R archive network (CRAN).
Zeros of Hook Polynomials and Related Questions
Creators: name: Bridges, Walter
name: Craig, William
name: Folsom, Amanda
name: Rolen, Larry
Publisher: name: arXiv
Year: 2024
Subjects: subject: Combinatorics (math.CO)
subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: We study the zero set of polynomials built from partition statistics, complementing earlier work in this direction by Boyer, Goh, Parry, and others. In particular, addressing a question of Males with two of the authors, we prove asymptotics for the values of $t$-hook polynomials away from an annulus and isolated zeros of a theta function. We also discuss some open problems and present data on other polynomial families, including those associated to deformations of Rogers-Ramanujan functions.
Market Price of Risk and Random Field Driven Models of Term Structure: A Space-Time Change of Measure Look
Creators: name: Allouba, Hassan
name: Goodman, Victor
Publisher: name: arXiv
Year: 2010
Subjects: subject: Pricing of Securities (q-fin.PR)
subject: Probability (math.PR)
subject: FOS: Economics and business
subject: FOS: Mathematics
subject: 91B24, 60H15 (Primary), 60H10 (Secondary)

description: No-arbitrage models of term structure have the feature that the return on zero-coupon bonds is the sum of the short rate and the product of volatility and market price of risk. Well known models restrict the behavior of the market price of risk so that it is not dependent on the type of asset being modeled. We show that the models recently proposed by Goldstein and Santa-Clara and Sornette, among others, allow the market price of risk to depend on characteristics of each asset, and we quantify this dependence. A key tool in our analysis is a very general space-time change of measure theorem, proved by the first author in earlier work, and covers continuous orthogonal local martingale measures including space-time white noise.
description: 7 pages, 5/9 papers from my 2000-2006 collection (preprint version)
Customised broadband metamaterial absorbers for arbitrary polarisation
Creators: name: Wakatsuchi, Hiroki
name: Greedy, Stephen
name: Christopoulos, Christos
name: Paul, John
Publisher: name: arXiv
Year: 2010
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: This paper shows that customised broadband absorption of electromagnetic waves having arbitrary polarisation is possible by use of lossy cut-wire (CW) metamaterials. These useful features are confirmed by numerical simulations in which different lengths of CW pairs are combined as one periodic metamaterial unit and placed near to a perfect electric conductor (PEC). So far metamaterial absorbers have exhibited some interesting features, which are not available from conventional absorbers, e.g. straightforward adjustment of electromagnetic properties and size reduction. The paper shows how with proper design a broad range of absorber characteristics may be obtained.
description: 12 pages, 5 figures, submitted to Optics Express
Impact of sarcopenia and fat distribution on outcomes in penile cancer
Creators: name: Hartmann, Valerie
name: Engelmann, Simon Udo
name: Pickl, Christoph
name: Haas, Maximilian
name: Kälble, Sebastian
name: Goßler, Christopher
name: Eckl, Christoph
name: Hofmann, Aybike
name: Pichler, Renate
name: Burger, Maximilian
name: Mayr, Roman
Publisher: name: Universität Regensburg
Year: 2024
Subjects: subject: Squamous carcinoma, Body composition, Skeletal muscle index, Psoas muscle index, Visceral, obesity
subject: 610 Medizin

description: Sarcopenia, defined as age-associated loss of skeletal muscle function and muscle mass, is a negative prognostic marker for survival in several tumor entities. However, data evaluating the impact of sarcopenia and fat distribution on penile cancer are rarely described. We performed a retrospective study including 38 patients who were diagnosed with squamous cell carcinoma of the penis. By measuring skeletal muscle mass and fat distribution at axial abdominal computed tomography images at the third lumbar vertebra several body composition parameters including skeletal muscle index (SMI), psoas muscle index (PMI), visceral obesity and visceral-to-subcutaneous fat ratio were determined. Among 38 patients, 26% (n = 10) of the patients with penile cancer were identified as sarcopenic. SMI, age, lymph node metastases, distant metastases and penile cancer of the shaft were identified as significant risk factors for overall survival. PMI and distant metastases were significantly associated with cancer specific survival. None of the analysed adipose tissue parameters could be identified as risk factors for survival in this study. We showed that sarcopenia occurs in a relevant part of patients with penile cancer and is a significant risk factor for overall survival (p = 0.032) and cancer specific survival (p = 0.034) for patients with penile cancer. Regarding fat distribution further studies are needed to evaluate its impact on sarcopenia and survival.
Spectral functions of isolated Ce adatoms on paramagnetic surfaces
Creators: name: Gardonio, S.
name: Wehling, T. O.
name: Petaccia, L.
name: Lizzit, S.
name: Vilmercati, P.
name: Goldoni, A.
name: Karolak, M.
name: Lichtenstein, A. I.
name: Carbone, C.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We report photoemission experiments revealing the full valence electron spectral function of Ce adatoms on Ag(111), W(110) and Rh(111) surfaces. A transfer of Ce 4f spectral weight from the ionization peak towards the Fermi level is demonstrated upon changing the substrate from Ag(111) to Rh(111). In the intermediate case of Ce on W(110) the ionization peak is found to be split. This evolution of the spectra is explained by means of first-principles theory which clearly demonstrates that a reliable understanding of magnetic adatoms on metal surfaces requires simultaneous low and high energy spectroscopic information.
description: 4 pages, 3 figures
SPDEs law equivalence and the compact support property: applications to the Allen-Cahn SPDE
Creators: name: Allouba, Hassan
Publisher: name: arXiv
Year: 2010
Subjects: subject: Probability (math.PR)
subject: Mathematical Physics (math-ph)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 60H15, 35R60 (Primary), 35B99 (Secondary)

description: Using our uniqueness in law transfer result for SPDEs, described in a recent note, we prove the equivalence of laws of SPDEs differing by a drift, under vastly applicable conditions. This gives us the equivalence in the compact support property among a large class of SPDEs. As an important application, we prove the equivalence in law of the Allen-Cahn and the associated heat SPDEs; and we give a criterion for the compact support property to hold for the Allen-Cahn SPDE with diffusion function $a(t,x,u)=Cu^γ$, with $C\ne0$ and $ 1/2\leγ<1$.
description: 6 pages, 2/9 papers from my 2000-2006 collection (preprint version)
Quantum non-demolition measurement of microwave photons using engineered quadratic interactions
Creators: name: Deng, Chunqing
name: Gambetta, J. M.
name: Lupascu, A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a quantum electrical circuit with Josephson junctions formed of two anharmonic oscillators coupled with an interaction $gγ_{1}^{2}γ_{2}^{2}$ where $γ_{1}$ and $γ_{2}$ are position-like coordinates. This type of coupling allows the quantum non-demolition measurement of the energy of one oscillator by monitoring the frequency of the second oscillator. Despite the fundamental tradeoff between the coupling strength $g$ and maximum photon storage capacity of the oscillators, it is possible to achieve high fidelity detection of up to 10 photons over time scale of the order of microseconds. We discuss the possibility of observing quantum jumps in the number of photons and related applications.
description: 5 pages, 3 figures
Tunability of photogenerated charge carrier density on semiconductors by in-situ electrochemical treatments
Creators: name: Liu, Xu
Publisher: name: University of British Columbia
Year: 2018

description: With fossil fuels increasingly being exhausted and environment pollutions getting worse, it is necessary for our generation to look for sustainable, renewable and environmentally safe alternative energy sources. Solar energy is so far the most available resource, with around 120,000 TW of solar energy striking the surface of the earth. However, sunlight is just available in the daytime, can change within hours or seasons, and it is spread over low-density collection areas. An efficient way of energy storage is required for the utilization of solar energy. So far, one of the most practical ways to store a significant amount of energy is through a chemical energy carrier. Hydrogen fuel is one of the prime candidates as a future energy carrier which is environmentally friendly during its production, delivery, and consumption. Hydrogen production by photoelectrochemical water splitting using a semiconductor catalyst could be one of the most promising ways to harvest solar energy. In this thesis, an in-situ potentiodynamic approach (cyclic voltammetry) was used to modify the photoelectrocatalytic properties of nanostructured electrodes in different media. The effect of the morphology was studied by comparing TiO₂ nanotube and nanorod. Also, the influence of the modification on WO₃, ZnO materials was evaluated. The photogenerated charge carrier separation was studied by cyclic voltammetry (CV), linear sweep voltammetry (LSV), chronoamperometry (CA), and Mott-Schottky plots. The morphologies of the samples were tested by scanning electron microscope (SEM). X-ray diffraction (XRD) was used to analyze crystallinity. X-ray photoelectron spectroscopy (XPS) was used to characterize the surface chemical composition. The experimental data proved that electronic properties could be changed by the self-doping process, hence, improving the optical absorption properties and increase charge transfer rates. In this way, the photoelectrocatalytic activity of semiconductors was enhanced. The observed behaviors from electrochemical measurements suggested that morphology has a vital role in the capacitive properties. A semiconductor tailored via band structure modification indicates that the electrochemical treatment can be a systematic and straightforward technique for developing novel photoelectrocatalysts with enhanced performances under visible light.
Analysis of InAs Vertical and Lateral Band-to-Band Tunneling Transistors: Leveraging Vertical Tunneling for Improved Performance
Creators: name: Ganapathi, Kartik
name: Yoon, Youngki
name: Salahuddin, Sayeef
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Using self-consistent quantum transport simulation on realistic devices, we show that InAs band-to-band Tunneling Field Effect Transistors (TFET) with a heavily doped pocket in the gate-source overlap region can offer larger ON current and steeper subthreshold swing as compared to conventional tunneling transistors. This is due to an additional tunneling contribution to current stemming from band overlap along the body thickness. However, a critical thickness is necessary to obtain this advantage derived from 'vertical' tunneling. In addition, in ultra small InAs TFET devices, the subthreshold swing could be severely affected by direct source-to-drain tunneling through the body.
X-ray mass proxies from hydrodynamic simulations of galaxy clusters (paper I)
Creators: name: Fabjan, D.
name: Borgani, S.
name: Rasia, E.
name: Bonafede, A.
name: Dolag, K.
name: Murante, G.
name: Tornatore, L.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present a detailed study of scaling relations between total cluster mass and three mass proxies based on X-ray observables: temperature of the intra-cluster medium, gas mass and the product of the two, Y_X. Our analysis is based on two sets of high-resolution hydrodynamical simulations performed with the TreePM-SPH GADGET code. The first set includes about 140 clusters with masses above 5x10^13 M_sun/h (30 having mass above 10^15 M_sun/h), that have been simulated with (i) non-radiative physics and including (ii) cooling, star formation, chemical enrichment and the effect of supernova feedback triggering galactic ejecta. This large statistics is used to quantify the robustness of the scaling relations, to determine their redshift evolution and to calibrate their intrinsic scatter and its distribution. We use a smaller set of clusters including 18 halos with masses above 5x10^13 M_sun/h to test the robustness of mass proxies against changing the physical processes included in simulations (thermal conduction, artificial viscosity, cooling and star formation, galactic winds and AGN feedback). We find the M-Y_X scaling relation to be the least sensitive one to variations of the ICM physics, with its slope and redshift evolution close to the self-similar model predictions. The distribution of the scatter around the best-fitting relations is close to a log-normal one. M_gas has the smallest scatter in mass, with values of sigma_lnM = 0.04-0.06, depending on the physics included in the simulation, and with a mild dependence on redshift. The M-T relation is the one with the largest scatter, with sigma_lnM > 0.1 at z=0, increasing to > 0.15 at z=1. The intrinsic scatter in the M-Y_X relation is slightly larger than in the M-M_gas relation. These results confirm that both Y_X and M_gas mass proxies are well suited for cosmological applications of future large X-ray surveys. [abridged]
description: 17 pages, 11 figures, 4 tables, to appear in MNRAS
Qaqet
Creators: name: Tabain, Marija
name: Hellwig, B
Publisher: name: La Trobe
Year: 2024
Subjects: classificationCode: 52
subject: Psychology
subject: FOS: Psychology
classificationCode: 47
subject: Language, communication and culture

description: Qaqet (Glottocode qaqe1238; ISO 639-3: byx) is a Papuan (i.e. non-Austronesian) Baining language that is spoken by an estimated 15,000 people in Papua New Guinea’s East New Britain Province. Figure 1 shows a map of where Qaqet and the four other known Baining languages (Mali, Kairak (also spelt Qairaq – see map), Simbali and Ura) are spoken (see Stebbins, Evans & Terrill 2017 for an overview of Baining; for phonological descriptions, see Stanton 2007 on Ura, and Stebbins 2011 on Mali). The wider affiliations of the Baining languages are unknown. They share typological features with other East Papuan languages (i.e. the non-Austronesian languages of Island Melanesia), but there is no historical-comparative evidence to establish genealogical relationships.1 In terms of phonology, there are no structures shared across all of East Papuan, but Baining languages have similarities to the East Papuan language Kuot spoken on neighbouring New Ireland (i.e. the intervocalic lenition of voiceless plosives; pitch movements at the right edge of intonation units).2 Furthermore, language contact is known to have taken place across the entire region, and Baining languages share typological features with Oceanic languages. This includes phonemic contrasts between voiceless and voiced plosives and between /r/ and /l/; as well as a number of morphosyntactic structures (e.g. a large inventory of definite and indefinite articles, AVO/SV constituent order, prepositions).
Characterizing quantumness via entanglement creation
Creators: name: Gharibian, Sevag
name: Piani, Marco
name: Adesso, Gerardo
name: Calsamiglia, John
name: Horodecki, Pawel
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In [M. Piani et al., arXiv:1103.4032 (2011)] an activation protocol was introduced which maps the general non-classical (multipartite) correlations between given systems into bipartite entanglement between the systems and local ancillae by means of a potentially highly entangling interaction. Here, we study how this activation protocol can be used to entangle the starting systems themselves via entanglement swapping through a measurement on the ancillae. Furthermore, we bound the relative entropy of quantumness (a naturally arising measure of non-classicality in the scheme of Piani et al. above) for a special class of separable states, the so-called classical-quantum states. In particular, we fully characterize the classical-quantum two-qubit states that are maximally non-classical.
description: 13 pages, 1 figure, submitted to special issue of IJQI
Universal Stochastic Equations of Monitored Quantum Dynamics
Creators: name: Xiao, Zhenyu
name: Ohtsuki, Tomi
name: Kawabata, Kohei
Publisher: name: arXiv
Year: 2024
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate the monitored quantum dynamics of Gaussian mixed states and derive the universal Fokker-Planck equations that govern the stochastic time evolution of entire density-matrix spectra, obtaining their exact solutions. From these equations, we reveal an even-odd effect in purification dynamics: whereas entropy exhibits exponential decay for an even number $N$ of complex fermions, algebraic decay with divergent purification time occurs for odd $N$ as a manifestation of dynamical criticality. Additionally, we identify the universal fluctuations of entropy in the chaotic regime, serving as a non-unitary counterpart of the universal conductance fluctuations in mesoscopic electronic transport phenomena. Furthermore, we elucidate and classify the universality classes of non-unitary quantum dynamics based on fundamental symmetry. We also validate the universality of these analytical results through extensive numerical simulations across different types of models.
Signatures of hidden order symmetry in torque oscillations, elastic constant anomalies and field induced moments in URu2Si2
Creators: name: Thalmeier, Peter
name: Takimoto, Tetsuya
Publisher: name: arXiv
Year: 2011
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We discuss the conclusions on the symmetry of hidden order (HO) in URu2Si2 that may be drawn from recent torque experiments in rotating magnetic field by Okazaki et al. [1]. They are very sensitive to changes in the magnetic susceptibility induced by HO. We show that the observed twofold angular torque oscillations give evidence that hidden order has degenerate E- type (yz,zx) symmetry where both components are realised. The oscillations have the wrong characteristics or are absent for the 1D nontrivial representations like quadrupolar B1 (x^2-y^2) and B2 (xy) type HO or hexadecapolar A2(xy(x^2-y^2)) type HO. Therefore they may be excluded as candidates for hidden order. We also predict the field-angular variation of possible field-induced Bragg peaks based on underlying E-type order parameter and discuss the expected elastic constant anomalies.
description: 11 pages, 1 figure ; to appear in Phys. Rev. B
SYSTEM FOR READING AND ANALYZING SIGNALS OF THE HUMAN BRAIN
Creators: name: Kartolapov, Dmytro
name: Novikov, Oleksandr
Publisher: name: figshare
Year: 2022
Subjects: subject: 90302 Biomechanical Engineering
subject: FOS: Medical engineering

description: The given work is devoted to the methods for analysis of signals of the encephalograph by neural networks. A system for analysis of read brain signals using a handheld computer Raspberry Pi 3b+ is proposed. On the basis of this system it is proposed to create a neural network which will analyze the received signals. Analytical review of a device for reading and analysis of human brain signals using an encephalograph was performed. The parameters of the components were calculated and described the necessary components. The existing methods of receiving signals of the human brain are analyzed. Methods of analysis for additional algorithms of machine analysis are looked at. The basis of Neurocomputer Interface is the recognition of patterns of brain biopotentials. If the subject can change the nature of his biopotentials, for example, by performing certain mental tasks, the NCI system could translate these changes into control codes, such as by moving the mouse cursor on a computer screen or the hand of a robot manipulator. You can also use these codes to select letters on a "virtual keyboard" or to control a wheelchair. The most of current Neurocomputer Interfaces are preprogrammed. Firstly, that means that it is not consider brain characteristics of each user. This causes difference in work for each person so it may be very easy for one user and really hard for other. Secondly, a device can do built in tasks only. It can be really hard and even impossible to add new functionality to device. These restrictions can be removed by a device that can collect signals of human brain, label them and create the model that represents their connections and then use this model to recognize current state of human brain. This problem can be solved by connecting neurointerface to the pocket PC Raspberry pi 3b+ because it is compact enough and already have all needed data interfaces on RPi bus. Although, it can use python programming language that allows us to use tensorflow package that have already have a lot of functionality in using of neural networks.
Brownian-Time Processes: The PDE Connection and the Half-Derivative Generator
Creators: name: Allouba, Hassan
name: Zheng, Weian
Publisher: name: arXiv
Year: 2010
Subjects: subject: Probability (math.PR)
subject: Mathematical Physics (math-ph)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 60H30, 60J45, 60J35, 60J65 (Primary), 60J60 (Secondary)

description: We introduce a class of interesting stochastic processes based on Brownian-time processes. These are obtained by taking Markov processes and replacing the time parameter with the modulus of Brownian motion. They generalize the iterated Brownian motion (IBM) of Burdzy and the Markov snake of Le Gall, and they introduce new interesting examples. After defining Brownian-time processes, we relate them to fourth order parabolic PDEs. We then study their exit problem as they exit nice domains in $\Rd$, and connect it to elliptic PDEs. We show that these processes have the peculiar property that they solve fourth order parabolic PDEs, but their exit distribution - at least in the standard Brownian-time process case - solves the usual second order Dirichlet problem. We recover fourth order PDEs in the elliptic setting by encoding the iterative nature of the Brownian-time process, through its exit time, in a standard Brownian motion. We also show that it is possible to assign a formal generator to these non-Markovian processes by giving such a generator in the half-derivative sense.
description: 15 pages, 3/9 papers from my 2000-2006 collection (preprint version)
การพัฒนารูปแบบการจัดการเรียนรู้สำหรับโรงเรียนมัธยมศึกษาในภูมิภาคตะวันออกโดยใช้การวิจัยเชิงปฏิบัติการแบบมีส่วนร่วม
Creators: name: สุชาดา สวัสดี, ธนวิน ทองแพง, พงศ์เทพ จิระโร
Publisher: name: สำนักวิทยบริการ มหาวิทยาลัยสงขลานครินทร์ วิทยาเขตปัตตานี
Year: 2019
Subjects: การวิจัยเชิงปฏิบัติการแบบมีส่วนร่วม, รูปแบบการจัดการเรียนรู้, โรงเรียนมัธยมศึกษาในภูมิภาคตะวันออก, Participatory Action Research, instruction management model, secondary schools in the East

description: วารสารวิทยบริการ มหาวิทยาลัยสงขลานครินทร์, 30, 1, 11-21
Excitation of acoustic waves by vortices in the quiet Sun
Creators: name: Kitiashvili, I. N.
name: Kosovichev, A. G.
name: Mansour, N. N.
name: Wray, A. A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Computational Physics (physics.comp-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Five-minutes oscillations is one of the basic properties of solar convection. Observations show mixture of a large number of acoustic wave fronts propagating from their sources. We investigate the process of acoustic waves excitation from the point of view of individual events, by using realistic 3D radiative hydrodynamic simulation of the quiet Sun. The results show that the excitation events are related to dynamics vortex tubes (or swirls) in the intergranular lanes. These whirlpool-like flows are characterized by very strong horizontal velocities (7 - 11 km/s) and downflows (~ 7 km/s), and are accompanied by strong decreases of the temperature, density and pressure at the surface and in a ~ 0.5-1 Mm deep layer below the surface. High-speed whirlpool flows can attract and capture other vortices. According to our simulation results, the processes of the vortex interaction, such as vortex annihilation, can cause the excitation of acoustic waves.
description: 10 pages, 5 figure, submitted to ApJL
Response of Granulation to Small Scale Bright Features in the Quiet Sun
Creators: name: Andic, Aleksandra
name: Chae, J.
name: Ahn, K.
name: Goode, P. R.
name: Cao, W.
name: Yurchyshyn, V.
name: Abramenko, V.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We detected 2.8 bright points (BPs) per Mm$^2$ in the Quiet Sun (QS) with the New Solar Telescope (NST) at Big Bear Solar Observatory; using the TiO 705.68 nm spectral line, at an angular resolution ~ 0.1'' to obtain 30 min data sequence. Some BPs formed knots that were stable in time and influenced the properties of the granulation pattern around them. The observed granulation pattern within ~ 3'' of knots presents smaller granules than those observed in a normal granulation pattern; i.e., around the knots a suppressed convection is detected. Observed BPs covered ~ 5% of the solar surface and were not homogeneously distributed. BPs had an average size of 0.22'', they were detectable for 4.28 min in average, and had an averaged contrast of 0.1% in the deep red TiO spectral line.
description: 18 pages 8 figures. The version here has slightly different position and size of figures than the original article accepted in ApJ
Imaging the black hole shadow and extended jet of M87
Creators: name: Kim, Jong-Seo
name: Mueller, Hendrik
name: Nikonov, Aleksei S.
name: Lu, Ru-Sen
name: Knollmueller, Jakob
name: Ensslin, Torsten A.
name: Wielgus, Maciek
name: Lobanov, Andrei P.
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The galaxy M87 is one of the prime targets for high resolution radio imaging pursuing the ringlike shadow of its supermassive black hole, the innermost regions of accretion flow, and the formation of the relativistic jet. However, it remains challenging to observe both jointly. Only recently, global mm-VLBI array (GMVA)+ALMA observations at 86 GHz in 2018 were able to reconstruct the M87 black hole shadow and the extended jet emission simultaneously. In order to analyze the ring and jet of M87, conventional CLEAN algorithms were mainly employed alongside the RML method SMILI in the previous work. To test the robustness of the reconstructed structures of M87 GMVA+ALMA observations at 86GHz, we estimate the ring diameter, width, and the extended jet emission with the possible central spine by two different novel imaging algorithms: resolve and DoG-HiT. Overall reconstructions are consistent with the results reported in the previous paper. The ring structure of the M87 is resolved at higher resolution and the posterior distribution of M87 ring features is explored. The resolve images show that the ring diameter is 60.9 +- 2.2 muas and width is 16.0 +- 0.9 muas. The ring diameter is 61.0 muas and width is 20.6 muas by DoG-HiT. The ring diameter is therefore in agreement with the estimation (64+4-8 muas) by SMILI and the geometrical modeling. Two bright spots in the ring are reconstructed by four independent imaging methods, the substructure in the ring is therefore most likely originated from the data. A consistent limb-brightened jet structure is reconstructed by resolve and DoG-HiT, albeit with a less pronounced central spine. Modern data-driven imaging methods confirm the ring and jet structure in M87, complementing traditional VLBI methods with novel perspectives on the significance of recovered features. They confirm the result of the previous report.
description: submitted to A&A
Anisotropic Extinction Distortion of the Galaxy Correlation Function
Creators: name: Fang, Wenjuan
name: Hui, Lam
name: Menard, Brice
name: May, Morgan
name: Scranton, Ryan
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Similar to the magnification of the galaxies' fluxes by gravitational lensing, the extinction of the fluxes by comic dust, whose existence is recently detected by Menard et al (2009), also modify the distribution of a flux-selected galaxy sample. We study the anisotropic distortion by dust extinction to the 3D galaxy correlation function, including magnification bias and redshift distortion at the same time. We find the extinction distortion is most significant along the line of sight and at large separations, similar to that by magnification bias. The correction from dust extinction is negative except at sufficiently large transverse separations, which is almost always opposite to that from magnification bias (we consider a number count slope s > 0.4). Hence, the distortions from these two effects tend to reduce each other. At low z (~<1), the distortion by extinction is stronger than that by magnification bias, but at high z, the reverse holds. We also study how dust extinction affects probes in real space of the baryon acoustic oscillations (BAO) and the linear redshift distortion parameter beta. We find its effect on BAO is negligible. However, it introduces a positive scale-dependent correction to beta that can be as large as a few percent. At the same time, we also find a negative scale-dependent correction from magnification bias, which is up to percent level at low z, but to ~40% at high z. These corrections are non-negligible for precision cosmology, and should be considered when testing General Relativity through the scale-dependence of beta.
description: 13 pages, 4 figures, submitted to PRD
От библейского претекста к современному нарративу: интертекстуальность и символика в романе Инго Шульце «Адам и Эвелин»
Creators: name: Шевченко, Екатерина
Publisher: name: ООО Цифра
Year: 2025
Subjects: intertextuality
biblical motifs
Ingo Schulze
‘Adam and Evelyn’
agionym
precedent names
интертекстуальность
библейские мотивы
Инго Шульце
«Адам и Эвелин»
агионим
прецедентные имена

description: Russian Linguistic Bulletin, Выпуск 4 (64) 2025
Requirements for BIM-based building design coordination processes
Creators: name: Mehrbod, Sarmad
Publisher: name: University of British Columbia
Year: 2018

description: Building design coordination is a critical and challenging task to ensure that the design meets the functional, aesthetic, and economic requirements of project stakeholders. The cost of design coordination can be significant, with some estimating as high as two percent of the total cost on projects. It is therefore imperative that coordination issues get resolved as efficiently as possible, particularly given that thousands of conflicts may be identified during design coordination. Even with implementation of Building Information Modelling (BIM) project participants still face significant challenges that disrupt and hinder the coordination process. I have identified three critical issues that impact the successful implementation of BIM in design coordination processes: (1) the extent of BIM-based design coordination processes and protocols implemented, (2) the efficiency and ease in which practitioners interact with state of the art of BIM tools, and (3) the effectiveness in which design coordination issues are captured, represented and documented. Very little research has specifically looked at the BIM-based building design coordination with such focus. This dissertation investigates BIM-based building design coordination through the lens of two state of the art public sector projects. The research involved embedded case study analyses and a mixed-method contextualist research approach that included iterative grounded theory and co-production of knowledge. The investigation of BIM-based design coordination resulted in the formalization of design coordination processes, identification of bottlenecks faced by practitioners, and development of design considerations for BIM tools. The exploration of design coordination meetings resulted in taxonomy of interactions with design artifacts, outlining the relationships between goals, artifacts, interactions and transitions. The research on design coordination issue representation resulted in a classification taxonomy that explicitly represents process-based, model-based, and physical design issues. This research has many practical implications to the construction industry, as well as the BIM software development community. The research enables practitioners and researchers to better understand the challenges of BIM-based design coordination processes, helps the software development community to design state of the art BIM tools to better support practitioner interactions and navigations with BIM, and better manage and represent design coordination issues encountered throughout the coordination process.
Brownian-Time Processes: The PDE Connection II and the Corresponding Feynman-Kac Formula
Creators: name: Allouba, Hassan
Publisher: name: arXiv
Year: 2010
Subjects: subject: Probability (math.PR)
subject: Mathematical Physics (math-ph)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 60H30, 60J45, 60J35 (Primary), 60J60, 60J65 (Secondary)

description: We delve deeper into our study of the connection of Brownian-time processes (BTPs) to fourth order parabolic PDEs, which we introduced in a recent joint article with W. Zheng. Probabilistically, BTPs and their cousins BTPs with excursions form a unifying class of interesting stochastic processes that includes the celebrated IBM of Burdzy and other new intriguing processes, and is also connected to the Markov snake of Le Gall. BTPs also offer a new connection of probability to PDEs that is fundamentally different from the Markovian one. They solve fourth order PDEs in which the initial function plays an important role in the PDE itself, not only as initial data. We connect two such types of interesting and new PDEs to BTPs. The first is obtained by running the BTP and then integrating along its path, and the second type of PDEs is related to what we call the Feynman-Kac formula for BTPs. A special case of the second type is a step towards a probabilistic solution to linearized Cahn-Hilliard and Kuramoto-Sivashinsky type PDEs, which we tackle in an upcoming paper.
description: 11 pages, 4/9 papers from my 2000-2006 collection (preprint version)
AGN have Underweight Black Holes and Reach Eddington
Creators: name: King, A. R.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Eddington outflows probably regulate the growth of supermassive black holes (SMBH) in AGN. I show that effect of the Rayleigh--Taylor instability on these outflows means that SMBH masses are likely to be a factor of a few below the $M - σ$ relation in AGN. This agrees with the suggestion by Batcheldor (2010) that the $M - σ$ relation defines an upper limit to the black hole mass. I further argue that observed AGN black holes must spend much of their lives accreting at the Eddington rate. This is already suggested by the low observed AGN fraction amongst all galaxies despite the need to grow to the masses required by the Soltan relation, and is reinforced by the suggested low SMBH masses. Most importantly, this is the simplest explanation of the recent discovery by Tombesi et al (2010a, b) of the widespread incidence of massive ultrafast X--ray outflows in a large sample of AGN.
description: MNRAS, in press
Hybrid squeezing of solitonic resonant radiation in photonic crystal fibers
Creators: name: Tran, Truong X.
name: Cassemiro, Katiuscia N.
name: Soeller, Christoph
name: Blow, Keith J.
name: Biancalana, Fabio
Publisher: name: arXiv
Year: 2011
Subjects: subject: Optics (physics.optics)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We report on the existence of a novel kind of squeezing in photonic crystal fibers which is conceptually intermediate between the four-wave mixing induced squeezing, in which all the participant waves are monochromatic waves, and the self-phase modulation induced squeezing for a single pulse in a coherent state. This hybrid squeezing occurs when an arbitrary short soliton emits quasi-monochromatic resonant radiation near a zero group velocity dispersion point of the fiber. Photons around the resonant frequency become strongly correlated due to the presence of the classical soliton, and a reduction of the quantum noise below the shot noise level is predicted.
description: 5 pages, 2 figures