cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
All-Electron Path Integral Monte Carlo Simulations of Warm Dense Matter: Application to Water and Carbon Plasmas
Creators: name: Driver, Kevin
name: Militzer, Burkhard
Publisher: name: arXiv
Year: 2012
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We develop an all-electron path integral Monte Carlo (PIMC) method with free-particle nodes for warm dense matter and apply it to water and carbon plasmas. We thereby extend PIMC studies beyond hydrogen and helium to elements with core electrons. PIMC pressures, internal energies, and pair-correlation functions compare well with density functional theory molecular dynamics (DFT-MD) at temperatures of (2.5-7.5)$\times10^5$ K and both methods together form a coherent equation of state (EOS) over a density-temperature range of 3--12 g/cm$^3$ and 10$^4$--10$^9$ K.
О целесообразности перевода синхронных генераторов в режим синхронных компенсаторов
Creators: name: Владимировна, Шевченко Валентина
name: Матвеенко Павел Иванович
Publisher: name: Zenodo
Year: 2013
Subjects: электрические машины
турбогенераторы
ТГ
синхронные компенсаторы
реактивная мощность
система возбуждения

description: На русском: [Шевченко В.В., Матвеенко П.И. О целесообразности перевода синхронных генераторов в режим синхронных компенсаторов // Тезисы докладов 21-й международной научно-практической конференции "Информационные технологии: наука, техника, технология, образование, здоровье" (MicroCAD-2013), 29-31 мая 2013 г. (ISSN 2222-2944), часть 2, секция 9 "Электромеханическое и электрическое преобразование энергии" / ред. Товажнянский Л.Л. - Украина, Харьков: НТУ "ХПИ", 2013. - С. 169. https://doi.org/10.5281/zenodo.2550823]

Перевод турбогенераторов, отработавших свой срок эксплуатации, в режим синхронных компенсаторов (для регулирования реактивной мощности электросетей), целесообразен экономически.

Ключевые слова: электрические машины, турбогенераторы, ТГ, синхронные компенсаторы, реактивная мощность, система возбуждения.

Репозиторий НТУ "ХПИ" - открыть pdf
Electronic structure of fluorides: general trends for ground and excited state properties
Creators: name: Cadelano, Emiliano
name: Cappellini, Giancarlo
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The electronic structure of fluorite crystals are studied by means of density functional theory within the local density approximation for the exchange correlation energy. The ground-state electronic properties, which have been calculated for the cubic structures $CaF_{2}$,$SrF_{2}$, $BaF_{2}$, $CdF_{2}$, $HgF_{2}$, $β$-$PbF_{2}$, using a plane waves expansion of the wave functions, show good comparison with existing experimental data and previous theoretical results. The electronic density of states at the gap region for all the compounds and their energy-band structure have been calculated and compared with the existing data in the literature. General trends for the ground-state parameters, the electronic energy-bands and transition energies for all the fluorides considered are given and discussed in details. Moreover, for the first time results for $HgF_{2}$ have been presented.
Biogeochemical Exchange of Carbon After Peatland Restoration: Carbon Dioxide Fluxes and Dissolved Organic Carbon Export and Chemistry
Creators: name: Zuback', Yoseph
Publisher: name: Graduate Studies
Year: 2013
Subjects: Biogeochemistry
Physical Geography

description: This study looks at an abandoned peatland ten years after a restoration which was undertaken to return the peatland to its natural ecological function of carbon storage. This thesis examines the export of organic carbon in water (dissolved organic carbon), its chemical properties, and carbon dioxide (CO2) flux in different vegetation communities and environmental conditions, ultimately seeking to understand how restoration has affected the carbon exchange in the restored peatland, vs. an abandoned peatland, and a nearby natural peatland. DOC export was higher at the abandoned site over the course of the year, DOC chemical properties suggested slowing decomposition at the restored site, and restoration has roughly halved atmospheric carbon export, now ten years after restoration.
КАТЕГОРИЯ ЗАЛОГА В СОВРЕМЕННОМ АНГЛИЙСКОМ ЯЗЫКЕ
Creators: name: Абдуллаева, Санобар
Publisher: name: Zenodo
Year: 2023

description: Данная статья посвящена исследованию категории залога в английском языке. В статье приведены гипотезы разных лингвистов о численности залога в английском языке. Автор рассматривает принципы классификации залога, обсуждает вопросы, связанные с анализируемой темой.
A solution for tensor reduction of one-loop N-point functions with N >= 6
Creators: name: Fleischer, J.
name: Riemann, T.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Collisions at the LHC produce many-particle final states, and for precise predictions the one-loop $N$-point corrections are needed. We study here the tensor reduction for Feynman integrals with $N \ge 6$. A general, recursive solution by Binoth et al. expresses $N$-point Feynman integrals of rank $R$ in terms of $(N-1)$-point Feynman integrals of rank $(R-1)$ (for $N\ge 6$). We show that the coefficients can be obtained analytically from suitable representations of the metric tensor. Contractions of the tensor integrals with external momenta can be efficiently expressed as well. We consider our approach particularly well suited for automatization.
description: 11 pages
Does exposure to fluoroquinolone antibiotics delay diagnosis of pulmonary tuberculosis?
Creators: name: Wang, Yi Qing
Publisher: name: University of British Columbia
Year: 2010

description: Tuberculosis (TB) remains a major public health concern, and a delay in its diagnosis leads to continued disease transmission, and at the population level, may result in ineffective TB control programs. This delay may be associated with the inappropriate use of antibiotics, particularly the respiratory fluoroquinolones (FQ). In our study we determined whether the use of fluoroquinolones and other antibiotics results in a delay in the diagnosis of TB. We used population-based data from the British Columbia Linked Health Databases (BCLHD), which collects longitudinal health care information. Residents who had active pulmonary TB from January 1, 1997 to December 31, 2006 as identified through the provincial TB control database were included and linked with data in BCLHD. Negative binomial regression was used to calculate the relative risk (RR) of health care delay (the time between first patient contact with the health care system for a respiratory condition and the initiation of anti-TB medication) and antibiotic delay (the time between first patient prescription fill for antibiotics and initiation of anti-TB medication) compared to controls, adjusting for potential confounders. A total of 2232 patients had active TB diagnosed in BC between 1997 and 2006. Of these, 1544 participants were included in the study with health care contact six months prior to the date of diagnosis. After adjusting for gender, age, foreign-born status, socioeconomic status, prior chest radiograph and physician specialist visit, the health care delay for patients exposed to antibiotics was found to be significant at RR 2.10 (95% CI 1.80-2.44). Gender, age, foreign-born status and socioeconomic status were not found to be significant factors. When categorizing this delay by antibiotic type, all antibiotic categories were at a significantly increased risk for delay. In addition, this delay increased as the antibiotics prescribed also increased for the patient. Delay related to antibiotic exposure was found to be significant for the combination of FQ and non-FQ antibiotics at RR 1.35 (95% CI 1.08-1.70), but not for the FQ or non-FQ only categories. Our results indicate a delay in TB diagnosis due to previous exposure to any antibiotic and not just fluoroquinolones.
La subversión de los papeles genéricos en Los cálices vacíos de Delmira Agustini
Creators: name: Jaco, Rebeca
Publisher: name: Graduate Studies
Year: 2016
Subjects: subject: Education--Language and Literature
subject: Literature--Latin American
subject: Gender Studies
subject: WomenÕs Studies
subject: Psychology--Social
subject: Agustini
subject: Gender
subject: Erotic
subject: Modernismo
subject: Feminism

description: The purpose of this study is to investigate and showcase the various ways in which Delmira Agustini’s Los cálices vacíos (1913) subverts the sexual gender roles. Agustini was a poet who was breaking literary barriers imposed by the modernist movement that preceded her. Eroticism in literature had been reserved for the male author to write about, while woman was subject to the ideas and objectifying images found in those phalocentric texts. The idea in general of a woman having erotic desires was already taboo, and for a female author to write about was unheard of. Agustini broke in her generation the sexually submissive woman stereotype in her poems and established an active feminine pursuit to satisfy female erotic desires. Apart from showing how Agustini’s poetry subverts the gendered sexual roles, I hope to demonstrate how she was a pioneer poet who disregarded the limitations that were deeply embedded in 20th century Latin American literature as to expressing feminine desires.
A unifying switching regime regression framework with applications in health economics
Creators: name: Marra, Giampiero
name: Radice, Rosalba
name: Zimmer, David
Publisher: name: Taylor & Francis
Year: 2023
Subjects: Medicine
Biotechnology
Biological Sciences not elsewhere classified
Information Systems not elsewhere classified
Mathematical Sciences not elsewhere classified
Cancer
Science Policy
Computational Biology

description: Motivated by three health economics-related case studies, we propose a unifying and flexible regression modeling framework that involves regime switching. The proposal can handle the peculiar distributional shapes of the considered outcomes via a vast range of marginal distributions, allows for a wide variety of copula dependence structures and permits to specify all model parameters (including the dependence parameters) as flexible functions of covariate effects. The algorithm is based on a computationally efficient and stable penalized maximum likelihood estimation approach. The proposed modeling framework is employed in three applications in health economics, that use data from the Medical Expenditure Panel Survey, where novel patterns are uncovered. The framework has been incorporated in the R package GJRM, hence allowing users to fit the desired model(s) and produce easy-to-interpret numerical and visual summaries.
THE ROLE OF FERGANA VALLEY WOMEN IN THE DEVELOPMENT OF UZBEKISTAN
Creators: name: Juraeva, Istora
Publisher: name: Zenodo
Year: 2023

description: In this article, the activities of women in the socio-economic and cultural spheres of Uzbekistan during the years of independence are highlighted on the example of the Fergana Valley (Andijan, Namangan, Fergana regions). The work of women who are mature specialists in their profession, dedicated to their work and received recognition is revealed.
Roman2023 abstract catalog
Creators: name: Petric, Andreea
name: Beaton, Rachael
name: Hoffmann, Samantha
name: Mutchler, Max
Publisher: name: Zenodo
Year: 2023
Subjects: Conference program

description: Abstracts for all presentations at the Roman2023 conference 20-23 June 2023: invited talks, contributed talks, and e-posters.
Statistical Analysis of Internal Corrosion of Sour Gas Pipelines
Creators: name: Deng, Qiang (Charles)
Publisher: name: Graduate Studies
Year: 2015
Subjects: subject: Engineering--Mechanical
subject: Corrosion
subject: sour
subject: pipelines

description: Gas gathering pipelines have played and will continue to play a critical role in safe, reliable transportation of sour gas. Highly corrosive gases and unstable operating conditions in gathering pipelines often contributes and results in serious internal corrosion. This study focuses on statistical analysis of the in-line inspection (ILI) data on sour gas gathering pipelines to understand the parametric effects on internal corrosion of the pipeline. The ILI data showed that the bottom of the pipeline does not experience appreciable corrosion. The serious corrosion was observed to always occur at the interface between gas and liquid phases. Studies also showed that internal corrosion defects were more likely to occur on the uphill segment of pipeline than the downhill segment. Simulations of the flow patterns in the pipelines confirm that the uphill segment has the slug flow pattern which is likely a key factor in causing internal corrosion.
Congruent numbers and elliptic curves
Creators: name: Johnstone, Jennifer Ann
Publisher: name: University of British Columbia
Year: 2010

description: Throughout this thesis we will be primarily concerned with the area of a rational right angle triangle, also known as a congruent number. The purpose of this thesis is to present a family of congruent number elliptic curves with rank at least three, as well as provide some insight into the distribution of congruent numbers. We provide an in depth background on congruent numbers and elliptic curves, as well as an overview of one of the key methods that will be used in determining the rank of an elliptic curve.
America’s Alleged Intelligence Failure in the Prelude to Operation Iraqi Freedom: A Study of Analytic Factors
Creators: name: Cake, Timothy
Publisher: name: Graduate Studies
Year: 2017
Subjects: subject: Military Studies
subject: Central Intelligence Agency
subject: State Department Bureau of Intelligence and Research
subject: Intelligence Theory and Praxis
subject: Intelligence Failure Theory
subject: Operation Iraqi Freedom
subject: 9/11 Attacks
subject: Leader Member Exchange Theory
subject: Bureaucratic Politics
subject: Careerism
subject: Workplace bullying

description: In the prelude to Operation Iraqi Freedom (OIF), notables in the G. W. Bush administration declared Iraq to be an existential threat as it had weapons of mass destruction (WMD) and connections to transnational terrorist groups. After the 2003 invasion of that state, coalition forces engaged in a search effort that found no significant evidence of WMD. Investigatory committees subsequently judged Iraq had no WMD or terrorist group connections. This situation is broadly regarded as a failure by America’s intelligence community (IC). The initial hypotheses driving the research for this dissertation focused on four sets of factors: (1) a lack of fresh and accurate data; (2) a series of analytical and intellectual pathologies in the intelligence analysis process; (3) a dependence on scientistic, technology-driven methods of data collection and analysis; and (4) a serendipitous denial and deception (D & D) campaign mounted by Iraq’s government. However, the research undertaken did not support this initial line of argument. Instead, it suggested that the working-level members of the IC in the broad sense, correctly analyzed the Iraqi situation. The intelligence failure thus arose from other factors. These initial results pointed to factors in organizational and bureaucratic politics especially at the upper levels of the IC, in its relationship to senior levels of the G. W. Bush administration, and to channels for the assessment and movement of information that bypassed the established intelligence apparatus. Drawing on a detailed examination of the analyses and handling of claims regarding Iraqi WMD and its connections with terrorist groups, combined with considerations drawn from organizational and bureaucratic theories, the dissertation concludes (a) that there was no intelligence failure at the non-executive levels of the IC, but (b) there were distortions or suppressions of situationally-correct intelligence analytic products at the executive levels of the IC to support the policy preferences of certain G. W. Bush administration elites. In contrast to this, the Bureau of Intelligence and Research (INR) of the State Department not only was outstandingly accurate in its assessments of the Iraqi situation but also, bolstered by its executive team, was able to resist downward-facing pressures to generate policy-palatable analytic products.
Dynamical System Analysis of Cosmologies with Running Cosmological Constant from Quantum Einstein Gravity
Creators: name: Bonanno, Alfio
name: Carloni, Sante
Publisher: name: arXiv
Year: 2011
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We discuss a mechanism that induces a time-dependent vacuum energy on cosmological scales. It is based on the instability induced renormalization triggered by the low energy quantum fluctuations in a Universe with a positive cosmological constant. We employ the dynamical systems approach to study the qualitative behavior of Friedmann-Robertson-Walker cosmologies where the cosmological constant is dynamically evolving according with this nonperturbative scaling at low energies. It will be shown that it is possible to realize a "two regimes" dark energy phases, where an unstable early phase of power-law evolution of the scale factor is followed by an accelerated expansion era at late times.
description: 26 pages, 4 figures. To appear in New Journal of Physics
A phase diagram for a topological Kondo insulating system
Creators: name: Tran, Minh-Tien
name: Takimoto, Tetsuya
name: Kim, Ki-Seok
Publisher: name: arXiv
Year: 2011
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The discovery of topological insulators in non-interacting electron systems has motivated the community to search such topological states of matter in correlated electrons both theoretically and experimentally. In this paper we investigate a phase diagram for a topological Kondo insulating system, where an emergent "spin"-dependent Kondo effect gives rise to an inversion for heavy-fermion bands, responsible for a topological Kondo insulator. Resorting to the U(1) slave-boson mean-field analysis, we uncover an additional phase transition inside the Kondo insulating state in two dimensions, which results from the appearance of the topological Kondo insulator. On the other hand, we observe that the Kondo insulating state is distinguished into three insulating phases in three dimensions, identified with the weak topological Kondo insulator, the strong topological Kondo insulator, and the normal Kondo insulator, respectively, and classified by Z$_{2}$ topological indices. We discuss the possibility of novel quantum criticality between the fractionalized Fermi liquid and the topological Kondo insulator, where the band inversion occurs with the formation of the heavy-fermion band at the same time.
Vision Based Navigation (VBN) of Unmanned Aerial Vehicles (UAV)
Creators: name: Sheta, Bassem
Publisher: name: Graduate Studies
Year: 2012
Subjects: subject: Engineering--Electronics and Electrical
subject: VBN
subject: UAV
subject: Image Matching

description: Autonomous navigation systems used in Unmanned Aerial Vehicle (UAV) are mostly dependent on Global Positioning System (GPS) as a primary means of aiding Inertial Navigation Systems (INS) for accurate and reliable navigation. GPS, however, has limitations in terms of indoor availability and expected signal interference in the GPS-denied environments. The motivation of this thesis is to address the development of a low cost navigation system used onboard UAVs while maintaining accurate navigation. Motivated by the new advances in visual sensor solutions in combination with traditional navigation sensors, the proposed system is based on fusing visual measurements with INS measurements to achieve comprehensive, fast, real-time, and low cost Vision Based Navigation (VBN) system for the UAV. VBN is based on localizing set of features (with known coordinates) on the ground and finding their matches in the image taken by an imaging sensor on the UAV using a scale and rotation invariant image matching algorithm. Through Collinearity equations, object space transformation parameters are then estimated such that these matches are transformed into position information. Detailed system design and performance analysis are presented where scenarios include high dynamics of the UAV and different GPS outage are introduced. To insure fast and robust image matching algorithm, modified Speeded Up Robust Features (SURF) is introduced. The proposed algorithm is implemented on General Purpose (GP) Graphics Processing Unit (GPU) using Compute Unified Device Architecture (CUDA). Moreover, the developed algorithm is compared against the traditional least square approach, with nonlinear least squares approaches for solving the collinearity equations where large tilted aerial platform is expected, to overcome the expected non-linearity of the mathematical model of Collinearity equations. The navigation solution is then achieved by fusing the vision measurements to the Extended Kalman Filter (EKF) as Coordinate UPdaTe (CUPT) update for the INS measurements. Performance assessments results demonstrate the enhanced performance of the proposed system against stand-alone INS solutions during a GPS signal outage.
On Free Pseudo-Product Fundamental Graded Lie Algebras
Creators: name: Yatsui, Tomoaki
Publisher: name: arXiv
Year: 2012
Subjects: subject: Differential Geometry (math.DG)
subject: Complex Variables (math.CV)
subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics

description: In this paper we first state the classification of the prolongations of complex free fundamental graded Lie algebras. Next we introduce the notion of free pseudo-product fundamental graded Lie algebras and study the prolongations of complex free pseudo-product fundamental graded Lie algebras. Furthermore we investigate the automorphism group of the prolongation of complex free pseudo-product fundamental graded Lie algebras.
Thermal modeling validation techniques for thermoset polymer matrix composites
Creators: name: Slesinger, Nathan Avery
Publisher: name: University of British Columbia
Year: 2010

description: Process modeling is becoming a widely-accepted tool to reduce the time, cost, and risk in producing increasingly large and complicated composite structures. Process modeling reduces the need for physical parts, as it is not practical or economical to design and fabricate large composite structures using a trial-and-error approach. The foundation of the composite manufacturing process, and thus of process models, is the thermal history of the composite part during cure. Improperly curing the composite part will compromise its mechanical properties. Consequently, proper validation of the thermal model input parameters is critical, since the simulation output depends on the accuracy of the input. However, there are no standard methods to validate thermal process model input parameters. In this work, repeatable and robust methods were developed to isolate and validate the conductive heat transfer, thermochemical, and convective heat transfer sub-models. By validating the sub-models, the uncertainty of the complete thermal simulation was significantly reduced. Conductive and thermochemical material models were validated by comparing the thermal response of a material surrounded by rubber bricks to a 1-D simulation of the same materials. Four composite prepreg systems and their respective material models were tested, with agreement ranging from excellent (errors less than 1.0 °C) to poor (errors greater than 5.0 °C). Calorimetery, visual monitoring, and CFD were used to characterize the convective heat transfer environment inside the UBC autoclave. The validation methods were also used to better understand the capabilities and limitations of the autoclave. Local variations in airflow patterns and heat transfer coefficients showed that heat transfer can be highly variable in an individual piece of equipment. Simple procedures for characterization of an autoclave or oven were demonstrated. The developed methods can be used individually, or in combination, to validate thermal models and reduce uncertainties associated with the cure of composites. With further refinement, the demonstrated methods can be developed into validation standards for thermal modeling of composite materials.
Marriage or a Multiplicity of Meanings? The Dextrarum Iunctio on Roman and Early Christian Funerary Monuments
Creators: name: Baillargeon, Danielle
Publisher: name: Graduate Studies
Year: 2013
Subjects: subject: Art History
subject: Ancient
subject: Roman Art
subject: Early Christian Art
subject: Roman marriage

description: The intent of this study is to assess the validity of the monolithic association between the dextrarum iunctio motif and marriage. Drawing together a catalog of visual, textual and epigraphic evidence, this study will investigate the potential polysemous nature of the motif by utilizing a hybrid methodological framework that incorporates stylistic and compositional analysis with epigraphic evidence. This discussion will be informed by Place Studies, which focuses on the physical context of the motif and the monument. I suggest that the change in the type and the physical location of the monument provided the impetus for changes in the function of the dextrarum iunctio, making it an inherently multivalent motif. The dextrarum iunctio transformed from a motif that served a pragmatic function on Roman funerary reliefs, providing a means to depict relationships and integration into identity groups, to an allegorical motif that is combined with other ornamentation and complementary images on funerary altars and sarcophagi.
Multi-component parametric inversion of galaxy kinematics and stellar populations using full spectral fitting
Creators: name: Katkov, Ivan Yu.
name: Chilingarian, Igor V.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The stellar line-of-sight velocity distribution (LOSVD) can be strongly asymmetric in regions where the light contributions of both disc and bulge in spiral and lenticular galaxies are comparable. Existing techniques for the stellar kinematics analysis do not take into account the difference of disc and bulge stellar populations. Here we present a novel approach to the analysis of stellar kinematics and stellar populations. We use a two-component model of spectra where different stellar population components are convolved with pure Gaussian LOSVDs. For this model we present Monte-Carlo simulations demonstrating degeneracies between the parameters.
description: 3 pages, 2 figures; to appear in the proceedings of "The Spectral Energy Distribution of Galaxies", Preston, UK, 5-9 September 2011
IRRIGATION INSTRUMENT MODERNIZATION REFORM IN UZBEKISTAN
Creators: name: Shomurotov Sharofiddin Shukurjon ogli Teacher of Kokand State Pedagogical Institute
Publisher: name: Zenodo
Year: 2023

description: The article analyzes the implementation of reforms in the water management system in Uzbekistan during the years of independence, special attention is paid to the rational and economical use of water resources in the irrigation system of the republic, and the modernization processes in the field are gradually improving from year to year with the help of sources. . In this regard, in order to develop the system and guarantee it legally, a number of decisions and laws were developed and the issues of their implementation were revealed.
Key words: water management, water resources, reclamation and irrigation, irrigation technologies, reservoir, canal and collectors, reform.
PT-symmetrically deformed shock waves
Creators: name: Cavaglia, Andrea
name: Fring, Andreas
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate for a large class of nonlinear wave equations, which allow for shock wave formations, how these solutions behave when they are PT-symmetrically deformed. For real solutions we find that they are transformed into peaked solutions with a discontinuity in the first derivative instead. The systems we investigate include the PT-symmetrically deformed inviscid Burgers equation recently studied by Bender and Feinberg, for which we show that it does not develop any shocks, but peaks instead. In this case we exploit the rare fact that the PT-deformation can be provided by an explicit map found by Curtright and Fairlie together with the property that the undeformed equation can be solved by the method of characteristics. We generalise the map and observe this type of behaviour for all integer values of the deformation parameter epsilon. The peaks are formed as a result of mapping the multi-valued self-avoiding shock profile to a multi-valued self-crossing function by means of the PT-deformation. For some deformation parameters we also investigate the deformation of complex solutions and demonstrate that in this case the deformation mechanism leads to discontinuties.
description: 17 pages, 10 figures
Extracellular electrical signals in a neuron-surface junction: model of heterogeneous membrane conductivity
Creators: name: Bulai, Pavel M.
name: Molchanov, Pavel G.
name: Denisov, Andrey A.
name: Pitlik, Taras N.
name: Cherenkevich, Sergey N.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: Signals recorded from neurons with extracellular planar sensors have a wide range of waveforms and amplitudes. This variety is a result of different physical conditions affecting the ion currents through a cellular membrane. The transmembrane currents are often considered by macroscopic membrane models as essentially a homogeneous process. However, this assumption is doubtful, since ions move through ion channels, which are scattered within the membrane. Accounting for this fact, the present work proposes a theoretical model of heterogeneous membrane conductivity. The model is based on the hypothesis that both potential and charge are distributed inhomogeneously on the membrane surface, concentrated near channel pores, as the direct consequence of the inhomogeneous transmembrane current. A system of continuity equations having non-stationary and quasi-stationary forms expresses this fact mathematically. The present work performs mathematical analysis of the proposed equations, following by the synthesis of the equivalent electric element of a heterogeneous membrane current. This element is further used to construct a model of the cell-surface electric junction in a form of the equivalent electrical circuit. After that a study of how the heterogeneous membrane conductivity affects parameters of the extracellular electrical signal is performed. As the result it was found that variation of the passive characteristics of the cell-surface junction, conductivity of the cleft and the cleft height, could lead to different shapes of the extracellular signals.
SPECTATOR VIOLENCE IN MOROCCAN FOOTBALL STADIUM: PREVALENCE AND REASONS
Creators: name: Abdelkarim Elkhatir
name: Miloud Chakit
name: Ahmed O. T. Ahami
name: Jamila Riyahi
Publisher: name: Zenodo
Year: 2024
Subjects: Violent Behaviour, Football Stadium, Prevalence, Morocco

description: Abstract

In last decades, Violence in stadium become a complex phenomenon that requires an urgent intervention. The objective of current study was to determine the prevalence and critical factors responsible for violent behavior in Moroccan Football stadiums. Semi-structured interviews were conducted with 144 spectators by the end of Boutoula meetings. The interview including questions about sociodemographic characteristics of participants and violent behaviors by determining the type of violence; physical, verbal, symbolic and cyber violence. Results show that different forms of violence are shown and greatly vary depending on the sociodemographic characteristics. A relationship between age and socio-economic level and soccer stadium violence. A significant difference in the prevalence of violence (p <0.5%) between drug users and non-users was observed.  According to these results, it seems necessary to adopt new strategies like mobilization of all sports and youth organizations in different districts of the city to raise young people's awareness of the phenomena of violence and hooliganism in stadiums, also the dissemination of sports culture through the media.
Tracing Nitrogen in the Pedosphere and Hydrosphere of Agricultural Plots near Lethbridge, Alberta using Isotopic Techniques
Creators: name: Lam, Carmen
Publisher: name: Graduate Studies
Year: 2013
Subjects: subject: Geochemistry
subject: FOS: Earth and related environmental sciences
subject: Agriculture
subject: stable isotopes
subject: Groundwater nitrate
subject: Nitrification
subject: Denitrification

description: The source(s) and fate of nitrogen in soils and in shallow groundwater beneath agricultural plots with different fertilizer amendments were determined using isotopic techniques for an experimental field located near Lethbridge, Alberta. Isotopic compositions of nitrogen and of oxygen were determined for soil total nitrogen, soil nitrate, and groundwater nitrate. Treatment differences and temporal trends in groundwater nitrate concentrations indicated that synthetic fertilizer and fixed nitrogen had an impact on groundwater nitrate. Isotopic analyses identified mineralization of soil organic matter as the main source of soil and groundwater nitrogen, whereas fertilizer, fixed nitrogen, and manure did not appear to have had a large direct contribution. This may have been due to alteration of the original isotopic source signals of fertilizer, fixed nitrogen, and manure by nitrogen transformation processes (nitrification and denitrification) during nitrogen cycling in the soil and groundwater. Denitrification occurred in the groundwater within the three-year study period.
Weak solutions for a bioconvection model related to Bacillus subtilis
Creators: name: Vorotnikov, Dmitry
Publisher: name: arXiv
Year: 2012
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35Q35, 35B41, 35Q92, 76Z99, 92C17

description: We consider the initial-boundary value problem for the coupled Navier-Stokes-Keller-Segel-Fisher-Kolmogorov-Petrovskii-Piskunov system in two- and three-dimensional domains. The problem describes oxytaxis and growth of Bacillus subtilis in moving water. We prove existence of global weak solutions to the problem. We distinguish between two cases determined by the cell diffusion term and the space dimension, which are referred as the supercritical and subcritical ones. At the first case, the choice of the growth function enjoys wide range of possibilities: in particular, it can be zero. Our results are new even at the absence of the growth term. At the second case, the restrictions on the growth function are less relaxed: for instance, it cannot be zero but can be Fisher-like. In the case of linear cell diffusion, the solution is regular and unique provided the domain is the whole plane. In addition, we study the long-time behaviour of the problem, find dissipative estimates, and construct attractors.
description: 16 pages
Moving from two- to multi-way interactions among binary risk factors on the additive scale
Creators: name: Katsoulis, Michail
name: Gomes, Manuel
name: Bamia, Christina
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Medicine
subject: Biotechnology
subject: Sociology
subject: FOS: Sociology
subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics
subject: Cancer

description: Many studies have focused on investigating deviations from additive interaction of two dichotomous risk factors on a binary outcome. There is, however, a gap in the literature with respect to interactions on the additive scale of >2 risk factors. In this paper, we present an approach for examining deviations from additive interaction among three or more binary exposures. The relative excess risk due to interaction (RERI) is used as measure of additive interaction. First, we concentrate on three risk factors – we propose to decompose the total RERI to: the RERI owned to the joint presence of all three risk factors and the RERI of any two risk factors, given that the third is absent. We then extend this approach, to >3 binary risk factors. For illustration, we use a sample from data from the Greek EPIC cohort and we investigate the association with overall mortality of Mediterranean diet, body mass index , and smoking. Our formulae enable better interpretability of any evidence for deviations from additivity owned to more than two risk factors and provide simple ways of communicating such results from a public health perspective by attributing any excess relative risk to specific combinations of these factors. Abbreviations: BMI: Body Mass Index; ERR: excess relative risk; EPIC: European Prospective Investigation into Cancer and nutrition; MD: Mediterranean diet; RERI: relative excess risk due to interaction; RR: relative risk; TotRERI: total relative excess risk due to interaction
Nuclear energy density functional from chiral two- and three-nucleon interactions
Creators: name: Holt, J. W.
name: Kaiser, N.
name: Weise, W.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: An improved density-matrix expansion is used to calculate the nuclear energy density functional from chiral two- and three-nucleon interactions. The two-body interaction comprises long-range one- and two-pion exchange contributions and a set of contact terms contributing up to fourth power in momenta. In addition we employ the leading order chiral three-nucleon interaction with its parameters $c_E, c_D$ and $c_{1,3,4}$ fixed in calculations of nuclear few-body systems. With this input the nuclear energy density functional is derived to first order in the two- and three-nucleon interaction. We find that the strength functions $F_\nabla(ρ)$ and $F_{so}(ρ)$ of the surface and spin-orbit terms compare in the relevant density range reasonably with results of phenomenological Skyrme forces. However, an improved description requires (at least) the treatment of the two-body interaction to second order. This observation is in line with the deficiencies in the nuclear matter equation of state $\bar E(ρ)$ that remain in the Hartree-Fock approximation with low-momentum two- and three-nucleon interactions.
description: 16 pages, 12 figures, submitted to Eur. Phys. J. A
On The Shear Strength Of Partially Grouted Concrete Masonry
Creators: name: Hamedzadeh, Amirhossein
Publisher: name: Graduate Studies
Year: 2013
Subjects: subject: Sciences
subject: shear wall
subject: Masonry
subject: partially grouted

description: Masonry shear walls are one of the most common structural elements in buildings. The in-plane shear capacity of load-bearing walls is of great importance in the seismic design of structures. This study focuses on the shear behaviour of wide-spaced reinforced partially grouted (WRPG) concrete masonry walls. Twenty one shear walls were constructed with reduced-scale concrete masonry units. The experimental program consisted of eight groups of tests, with two or three identical specimens in each group. The specimens were subjected to monotonic lateral load, under near pure-shear boundary conditions. The parameters of the study include methods of load application, boundary conditions, aspect ratio, initial axial stress and specimen size. The shear capacities of the walls were compared against the predicted shear from four empirical equations. The sensitivity of the initial stiffness and different methods for calculation of ductility are discussed in detail. Lastly, the idea of strut-and-tie modeling was investigated for WRPG walls.
Cultural and Parental Influences on the Career Development of Second-Generation Chinese Canadians
Creators: name: Lei, Danni
Publisher: name: Graduate Studies
Year: 2016
Subjects: subject: Educational Psychology
subject: Education--Vocational
subject: career development
subject: Chinese Canadians
subject: family influence
subject: parental influence

description: This study explored cultural and parental influences on the career development of second-generation Chinese Canadians. A Systems Theory Framework of career development was used to frame the study. Using a qualitative approach, 10 participants with postsecondary education were individually interviewed. Thematic analysis revealed the pervasiveness of explicit conversations and implicit messages from parents throughout the lifetime, beginning in childhood. Cultural values and beliefs around work and career were often transmitted through the family, with participants compromising between family pressures and personal goals. It was difficult to separate parental values from personal values, with parental pressure shifting with time and context. In addition, the unique influences of sibling and peers were revealed. Participants expressed desire for more parental support and encouragement as well as other specific areas of support. Study limitations and implications for career counselling and educational institution settings are discussed, as well as future research directions.
MPEC 2023-X53 : 2023 XR
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2023
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2023 XR

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Determinants of Synaptic Integration in Cerebellar Neurons
Creators: name: Engbers, Jordan David Thomas
Publisher: name: Graduate Studies
Year: 2013
Subjects: subject: Neuroscience
subject: Physiology
subject: FOS: Biological sciences
subject: Cerebellum
subject: Purkinje
subject: Deep Cerebellar Nuclei
subject: Cav3 channel
subject: T-type
subject: KCa3.1
subject: Parallel Fibre
subject: HCN
subject: rebound burst
subject: synaptic processing

description: The integration of synaptic inputs by neurons relies on protein channels that conduct specific ions. Cav3 calcium (Ca2+) channels can amplify excitatory postsynaptic potentials (EPSPs) while Ca2+-activated potassium (KCa) channels decrease EPSP amplitude. By comparison, inhibitory postsynaptic potentials (IPSPs) can activate hyperpolarization-activated (HCN) channels that generate a rebound excitatory current at the end of an inhibitory stimulus. This thesis examines how Cav3, KCa, and HCN channels control synaptic integration in cerebellar Purkinje cells and deep cerebellar nuclei (DCN) neurons. These two populations of neurons are central to cerebellar function and represent a dichotomy of synaptic processing, as Purkinje cells receive primarily excitatory inputs, while DCN neurons receive mainly inhibitory inputs. I tested the hypothesis that Cav3-mediated Ca2+ current activates KCa channels to control the summation of parallel fibre EPSPs in Purkinje cells. Patch clamp recordings from in vitro slices of rat cerebellum showed that Cav3 current activates intermediate conductance KCa (KCa3.1) channels, which have previously never been found in central neurons. KCa3.1 channels are activated at hyperpolarized membrane voltages, due to an extended Cav3 channel window current, and suppress summation of low-frequency EPSPs. Dynamic clamp experiments and computer simulations revealed that the Cav3-KCa3.1 complex increases the signal-to-noise ratio for sensory-like parallel fibre inputs undergoing short-term facilitation by selectively suppressing background inputs. In DCN neurons, I tested the hypothesis that Cav3 and HCN channels control the frequency and timing of rebound bursts following inhibition by IPSPs. The results demonstrate that Cav3 and HCN currents are activated during physiological levels of hyperpolarization and modulate rebound bursts. A novel model of a DCN neuron showed that Cav3 current is solely responsible for generation of the rebound burst, while HCN channels increase burst frequency and temporal precision. Together, this research demonstrates how a novel Cav3-KCa3.1 channel complex participates in the processing of excitatory inputs, and identifies a new synergistic interaction between ion channels that enables processing of inhibitory inputs. These findings illustrate the importance of ion channel interactions for signal processing in the cerebellum, with far reaching implications for neural circuits throughout the brain.
Operator and commutator moduli of continuity for normal operators
Creators: name: Aleksandrov, Aleksei
name: Peller, Vladimir
Publisher: name: arXiv
Year: 2011
Subjects: subject: Functional Analysis (math.FA)
subject: Classical Analysis and ODEs (math.CA)
subject: Complex Variables (math.CV)
subject: Spectral Theory (math.SP)
subject: FOS: Mathematics

description: We study in this paper properties of functions of perturbed normal operators and develop earlier results obtained in \cite{APPS2}. We study operator Lipschitz and commutator Lipschitz functions on closed subsets of the plane. For such functions we introduce the notions of the operator modulus of continuity and of various commutator moduli of continuity. Our estimates lead to estimates of the norms of quasicommutators $f(N_1)R-Rf(N_2)$ in terms of $\|N_1R- RN_2\|$, where $N_1$ and $N_2$ are normal operator and $R$ is a bounded linear operator. In particular, we show that if $0
description: 33 pages