cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Heat Flow and Efficiency in a Microscopic Engine
Creators: name: Ai, Baoquan
name: Wang, Liqiu
name: Xie, Huizhang
name: Liu, Lianggang
Publisher: name: arXiv
Year: 2005
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: We study the energestics of a thermal motor driven by temperature differences, which consists of Brownian particles moving in a sawtooth potential with an external load where the viscous medium is alternately in contact with hot and cold heat reservoir. The motor can work as a heat engine or a refrigerator under different conditions. The heat flow via both potential and kinetic energy are considered. The former is reversible when the engine works quasistatically and the latter is always irreversible. The efficiency of the heat engine (Coefficient Of Performance (COP) of a refrigerator) can never approach Carnot efficiency (COP).
description: 16 pages, 14 figures
PAI-graphene: a new topological semimetallic two-dimensional carbon allotrope with highly tunable anisotropic Dirac cones
Creators: name: Chen, Xin
name: Bouhon, Adrien
name: Li, Linyang
name: Peeters, François M.
name: Sanyal, Biplab
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Using evolutionary algorithm for crystal structure prediction, we present a new stable two-dimensional (2D) carbon allotrope composed of polymerized as-indacenes (PAI) in a zigzag pattern, namely PAI-graphene whose energy is lower than most of the reported 2D allotropes of graphene. Crucially, the crystal structure realizes a nonsymmorphic layer group that enforces a nontrivial global topology of the band structure with two Dirac cones lying perfectly at the Fermi level. The absence of electron/hole pockets makes PAI-graphene a pristine crystalline topological semimetal having anisotropic Fermi velocities with a high value of $7.0 \times 10^{5}$ m/s. We show that while the semimetallic property of the allotrope is robust against the application of strain, the positions of the Dirac cone and the Fermi velocities can be modified significantly with strain. Moreover, by combining strain along both the x- and y-directions, two band inversions take place at $Γ$ leading to the annihilation of the Dirac nodes demonstrating the possibility of strain-controlled conversion of a topological semimetal into a semiconductor. Finally we formulate the bulk-boundary correspondence of the topological nodal phase in the form of a generalized Zak-phase argument finding a perfect agreement with the topological edge states computed for different edge-terminations.
Emerging Markets after Liberalization: Evidence from the Raw Milk Market in Rural Kenya
Creators: name: Kijima, Yoko
name: Yamano, Takashi
name: Baltenweck, Isabelle
name: Kijima, Yoko
name: Yamano, Takashi
name: Baltenweck, Isabelle
Publisher: name: Unknown
Year: 2006
Subjects: International Relations/Trade

description: This article examines how the raw milk marketing system in Kenya has evolved after the dairy sector liberalization in 1992 by using panel data of 874 rural households. From the 1998 to 2004, the proportion of rural households who sold milk increased from 37 to 51 percent. During the same period, the number of households who sold milk to traders tripled, while it has drastically declined for dairy cooperatives and a parastatal processing company. The price analysis indicates that the excess supply in localities does not affect the farm gate price received by milk producer in 1998, but not in 2004. This is because trading a perishable commodity, such as milk, over a long distance requires reliable market channels and it takes some time for such supporting market institutions to be established.
High-fidelity, low-latency polarization quantum state transmissions over a hollow-core conjoined-tube fibre at around 800 nm
Creators: name: Chen, Xin-Yu
name: Ding, Wei
name: Wang, Ying-Ying
name: Gao, Shou-Fei
name: Xu, Fei-Xiang
name: Xu, Hui-Chao
name: Hong, Yi-Feng
name: Sun, Yi-Zhi
name: Wang, Pu
name: Lu, Yan-Qing
name: Zhang, Lijian
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The performances of optical fibre-based quantum information systems are limited by the intrinsic properties of silica glass materials, e.g. high latency, Rayleigh-scattering loss wavelength scaling law, and cross-coupling induced modal impurity. Hollow-core optical fibre (HCF) promises to unify air-borne light propagation and non-line-of-sight transmission, thus holding great potentials for versatile photonics-based quantum infor-mation applications. The early version of HCF based on photonic-bandgap guidance has not proven itself as a reliable quantum channel because of the poor modal purity in both spatial and polarization domains, as well as significant difficulty in fabrication when the wavelength shifts to the visible region. In this work, based on the polarization degree of freedom, we first, to the best of our knowledge, demonstrate high-fidelity (~0.98) single-photon transmission and distribution of entangled photons over a conjoined-tube hollow-core fibre (CTF) by using commercial silicon single-photon avalanche photodiodes. Our CTF realized the combined merits of low loss, high spatial mode purity, low polarization degradation, and low chromatic dispersion. We also demonstrate single-photon low latency (~99.96% speed of light in vacuum) transmission, thus paving the way for extensive uses of HCF links in versatile polarization-based quantum information processing.
Impact of Creatine Monohydrate Supplementation on Maximum Strength in Bodybuilders, Weightlifters and Powerlifters
Creators: name: Gasmi, Amin
Publisher: name: figshare
Year: 2020
Subjects: subject: 111101 Clinical and Sports Nutrition
subject: FOS: Health sciences
subject: 111103 Nutritional Physiology
subject: 110602 Exercise Physiology
subject: 110604 Sports Medicine
subject: 110699 Human Movement and Sports Science not elsewhere classified

description: The aim of this research was to determine the effect of creatine monohydrate supplementation in athletes practicing weighttraining. Fifty-four (54) male high level athletes specialized in three weight sports were involved in our study : weightlifting, bodybuilding and powerlifting. Each of those sports included eighteen (18) athletes. Our sample was divided into three groups: a control group and two experimental groups of 18 athletes each. Each athlete performed three tests (a starting test in day1 and day2, a second test at the end of the supplementation period in day 50 and day 51 and a third test at the end of the experiment 28 days after the end of supplementation in day77 and day78) five exercises of maximum strength (1-RM) was tested in every test : the back squat, the bench press, the deadlift, the military press the horizontal row in addition to the snatch and the clean and jerk which concerned only weightlifters. Three trials of 1-RM for each exercise were performed by each athlete where the best trial results in each exercise were recorded. The control group ingested a placebo substance throughout the supplementation period. The second group was supplemented following a protocol of 10 g per day taken in twice for 7 days followed by a maintenance dose of 3 g for 41 days. The third group was supplemented following a protocol of 20g per day in four times taking 5g each for 7 days followed by 5g for 41 days. The results of this research have shown that creatine monohydrate interest in improving maximal strength among professional athletes of weighttraining is undeniable. The supplementation protocol followed by the third group seems to be the most effective dose in order to develop the maximum strength in the athletes of this kind of sport. There is also a satellite effect of a cure of creatine monohydrate supplementation of 48 days up to four weeks. There is no significant difference in the rate of improvement of the maximal strength between the different exercises and different weighttraining specialties explored in this study. However, this rate was less marked in the two competitive weightlifting exercises (snatch and clean and jerk).
[Letter from Kichisaburo Yendo]
Creators: name: Yendo, Kichisaburo
Publisher: name: Unknown
Year: 1902
Subjects: MacMillan, Conway

description: Has sent Professor Conway Mac Millan of the University of Minnesota the paper on the Corallinae of Canada, and has written to him to say that he can expect your paper on the Corallinae (verae) of Canada. The Corallinaceae of Canada would thus be more or less complete.
Highly Efficient Second Harmonic Generation of Thin Film Lithium Niobate Nanograting near Bound States in the Continuum
Creators: name: Huang, Zhijin
name: Wang, Mengjia
name: Li, Yang
name: Shang, Jumei
name: Li, Ke
name: Qiu, Wentao
name: Dong, Jiangli
name: Guan, Heyuan
name: Chen, Zhe
name: Lu, Huihui
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Bound states in the continuum (BICs), a concept from quantum mechanics, are ubiquitous physical phenomena where waves will be completely locked inside physical systems without energy leaky. Such a physical phenomenon in optics will provide a platform for optical mode confinement to strengthen local field enhancement in nonlinear optics. Here we utilize an optical system consisting of asymmetric nanogratings and waveguide of thin film lithium niobate (LiNbO3) material to enhance second harmonic response near BICs. By breaking the symmetry of grating periodicity, we realize strong local field confined inside waveguide up to 25 times normalized to incident field (with dissymmetric factor of 0.2), allowing strong light-matter interaction in nonlinear material. From the numerical simulation, we theoretically demonstrate that such an optical system can greatly enhance second harmonic intensity enhancement of about 104 compared with undersigned LiNbO3 film and conversion efficiency reaching 1.53e-5 for dissymmetric factor=0.2 under illumination of 1.33 GW/(suqare cm). Surprisingly, we can predict that a giant enhancement of second harmonic conversion efficiency will exceed 8.13e-5 for dissymmetric factor=0.1 when the optical system is extremely close to BICs. We believe that such an optical system to trap local field inside is also accessible to promote the application of thin film lithium niobate in the field of integrated nonlinear optics.
Propagators for Noncommutative Field Theories
Creators: name: Gurau, R.
name: Rivasseau, V.
name: Vignes-Tourneret, F.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: In this paper we provide exact expressions for propagators of noncommutative Bosonic or Fermionic field theories after adding terms of the Grosse-Wulkenhaar type in order to ensure Langmann-Szabo covariance. We emphasize the new Fermionic case and we give in particular all necessary bounds for the multiscale analysis and renormalization of the noncommutative Gross-Neveu model.
description: 26 pages. Same results but improved version accroding to referee's suggestions
Mutual Crop Insurance and Moral Hazard: The Case of Mexican Fondos
Creators: name: Breustedt, Gunnar
name: Larson, Donald F.
name: Breustedt, Gunnar
name: Larson, Donald F.
Publisher: name: Unknown
Year: 2006
Subjects: Risk and Uncertainty

description: Insuring against crop yield risk is an important task in rural microfinance because such an insurance may improve access to capital for smallholders by substituting for collaterals. However, agricultural crop yield risk is even hard to mitigate in developed countries due to problems of asymmetric information. In this paper we investigate theoretically and empirically whether special institutional rules in Mexican mutual crop insurance groups, called Fondos, can reduce problems of moral hazard. After presenting this case of a multiple peril crop insurance, we model a dynamic stochastic control problem extending it to a moral hazard game. We show from a theoretical point of view that institutions in the Fondos system have impact on the farmers' behaviour to avoid or reduce losses. Thus, if farmers can influence the level of losses or the loss probability technologically the institutions can be used to restrict the incentives for moral hazard. In the empirical analysis - by means of panel logistic random effects as well as fixed effects regressions - we show that a certain rule reduces the loss probability in a Fondo. Thus, we have empirically shown both that an institution of the Fondos can reduce moral hazard and that moral hazard exists in this insurance system of a multiple peril crop insurance as in common crop yield risk insurance schemes. From a political perspective, our analysis supports the view that this system of Mexican Fondos may serve as a blueprint for crop insurance schemes in developing countries.
[Letter from Anna Antoinette Weber van Bosse]
Creators: name: Weber Van Bosse, Anna Antoinette
Publisher: name: Unknown
Year: 1902
Subjects: Yendo, Kichisaburo
Lamouroux, Jean Vincent Félix

description: Can offer better photographs made in Amsterdam than those made for your own work and for the paper on the Maldives Lithothamnia. The formula for decalcification purposes is: 10% nitric acid 200 cm3, 90% alcohol 150 cm3, 0,5% chromic acid 150 cm3. She has received safely the box with containing slides of Heydrich’s specimens. Asks where the photograph of Lithothamnion moluccense were made for Foslie’s own work and for the paper on the Maldivie Lithothamnia.
[Letter from Emile Auguste Joseph De Wildeman]
Creators: name: De Wildeman, Emile Auguste Joseph
Publisher: name: Unknown
Year: 1902
Subjects: Hariot, Paul Auguste

description: Does not have any copies of the requested paper left. It was published in Bull. Acad. royale de Belgique 1900, no. 7, pp. 558-564. Hariot may have some copies left.
Agglomeration and Growth with and without Capital Mobility
Creators: name: Baldwin, Richard E.
name: Forslid, Rikard
name: Martin, Philippe
name: Ottaviano, Gianmarco I.P.
name: Robert-Nicoud, Frederic
name: Baldwin, Richard E.
name: Forslid, Rikard
name: Martin, Philippe
name: Ottaviano, Gianmarco I.P.
name: Robert-Nicoud, Frederic
Publisher: name: Unknown
Year: 2001
Subjects: International Development

description: This paper presents a simple framework in which the location and the growth rate of economic activities are endogenous and interact. We show that the nature of the equilibrium and of the relation between growth and location depends fundamentally on whether capital is assumed to be mobile (in which case we interpret it as physical capital) or immobile (human capital). In the first case, with constant returns to scale, growth and location are independent and no divergence or convergence process takes place. We show that newly created firms can relocate to the poor region, even though there is always a higher share of firms in the rich region, if the industry is competitive and if the return to capital is low. With immobile capital, a process of convergence between regions takes place when transaction costs on goods are sufficiently high but a process of "catastrophic" agglomeration occurs when these costs are sufficiently high and regional inequality is not affected between regions. With localized technological spillovers, higher spatial concentration of economic activities spurs growth, whether capital is mobile or not. This implies that lowering transaction costs on goods can spur growth but increase regional inequality. Lowering transaction costs on "trade in technologies" between regions may increase both regional equality and growth.
The Positioning of Greek Feta Cheese in a Local UK Market: A Major Marketing Strategy Problem
Creators: name: Krystallis, Athanasios
name: Papadopoulou, Victoria
name: Chryssochoidis, George M.
name: Krystallis, Athanasios
name: Papadopoulou, Victoria
name: Chryssochoidis, George M.
Publisher: name: Unknown
Year: 2004
Subjects: subject: Marketing
subject: FOS: Economics and business

description: The survey aims at analysing the current positioning of Greek feta cheese. A regional UK market is selected as a typical research location. Four components of feta cheese's marketing mix (country of origin, brand name, type of milk used and price) are included in a conjoint task of product evaluation. Based on the importance assigned to these attributes, the survey identifies a number of consumer segments, and defines those that have a possibility to constitute regular feta cheese buyers. Feta cheese is seen by consumers of the sample as expensive compared to its perceived quality. This perception is attributed to the modest image of the product, which does not motivate a purchasing behaviour typical for a specialty cheese. Findings indicate the pressing need to reposition the product in the UK market.
Short-term forecasting COVID-19 cumulative confirmed cases: Perspectives for Brazil
Creators: name: Ribeiro, Matheus Henrique Dal Molin
name: da Silva, Ramon Gomes
name: Mariani, Viviana Cocco
name: Coelho, Leandro dos Santos
Publisher: name: arXiv
Year: 2020
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: Machine Learning (cs.LG)
subject: FOS: Biological sciences
subject: FOS: Computer and information sciences

description: The new Coronavirus (COVID-19) is an emerging disease responsible for infecting millions of people since the first notification until nowadays. Developing efficient short-term forecasting models allow knowing the number of future cases. In this context, it is possible to develop strategic planning in the public health system to avoid deaths. In this paper, autoregressive integrated moving average (ARIMA), cubist (CUBIST), random forest (RF), ridge regression (RIDGE), support vector regression (SVR), and stacking-ensemble learning are evaluated in the task of time series forecasting with one, three, and six-days ahead the COVID-19 cumulative confirmed cases in ten Brazilian states with a high daily incidence. In the stacking learning approach, the cubist, RF, RIDGE, and SVR models are adopted as base-learners and Gaussian process (GP) as meta-learner. The models' effectiveness is evaluated based on the improvement index, mean absolute error, and symmetric mean absolute percentage error criteria. In most of the cases, the SVR and stacking ensemble learning reach a better performance regarding adopted criteria than compared models. In general, the developed models can generate accurate forecasting, achieving errors in a range of 0.87% - 3.51%, 1.02% - 5.63%, and 0.95% - 6.90% in one, three, and six-days-ahead, respectively. The ranking of models in all scenarios is SVR, stacking ensemble learning, ARIMA, CUBIST, RIDGE, and RF models. The use of evaluated models is recommended to forecasting and monitor the ongoing growth of COVID-19 cases, once these models can assist the managers in the decision-making support systems.
description: 17 pages, 5 figures. Published paper. arXiv admin note: substantial text overlap with arXiv:2007.10981
How Economic Factors Influence the Nutrient Content of Diets: an Application of Animal Products Demand System in Tunisia
Creators: name: Dhehibi, Boubaker
name: Laajimi, Abderraouf
name: Dhehibi, Boubaker
name: Laajimi, Abderraouf
Publisher: name: Unknown
Year: 2004
Subjects: Food Consumption/Nutrition/Food Safety

description: Most of the literature on Tunisian food demand measures the influence of traditional variables such as income and prices, or some socio-demographic variables. However, nowadays other important factors determine the consumer's final choice, among which are: the nutritious quality, the nutrient content of food and the increasing concern about health. The objective of this paper is twofold. On one hand, the paper aims to analyse the effect of previous factors on meat consumer behaviour. On the other hand, to the author's knowledge, this may well be one of the first studies that use data to answer the previous questions in the case of Tunisia. The nutritious quality of meat is measured by an index that relates nutrient content of each product with the standards suggested by the National Academy of Science. To cope with the second objective a demand system has been specified and estimated and nutrient elasticities have been obtained. Results are different from traditional studies in the sense that higher prices do not indicate lower consumption but a higher quality demand.
An energy landscape approach to locomotor transitions in complex 3D terrain
Creators: name: Othayoth, Ratan
name: Thoms, George
name: Li, Chen
Publisher: name: arXiv
Year: 2020
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Systems and Control (eess.SY)
subject: Quantitative Methods (q-bio.QM)
subject: FOS: Physical sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Biological sciences

description: Effective locomotion in nature happens by transitioning across multiple modes (e.g., walk, run, climb). Despite this, far more mechanistic understanding of terrestrial locomotion has been on how to generate and stabilize around near-steady-state movement in a single mode. We still know little about how locomotor transitions emerge from physical interaction with complex terrain. Consequently, robots largely rely on geometric maps to avoid obstacles, not traverse them. Recent studies revealed that locomotor transitions in complex 3-D terrain occur probabilistically via multiple pathways. Here, we show that an energy landscape approach elucidates the underlying physical principles. We discovered that locomotor transitions of animals and robots self-propelled through complex 3-D terrain correspond to barrier-crossing transitions on a potential energy landscape. Locomotor modes are attracted to landscape basins separated by potential energy barriers. Kinetic energy fluctuation from oscillatory self-propulsion helps the system stochastically escape from one basin and reach another to make transitions. Escape is more likely towards lower barrier direction. These principles are surprisingly similar to those of near-equilibrium, microscopic systems. Analogous to free energy landscapes for multi-pathway protein folding transitions, our energy landscape approach from first principles is the beginning of a statistical physics theory of multi-pathway locomotor transitions in complex terrain. This will not only help understand how the organization of animal behavior emerges from multi-scale interactions between their neural and mechanical systems and the physical environment, but also guide robot design, control, and planning over the large, intractable locomotor-terrain parameter space to generate robust locomotor transitions through the real world.
Filament depolymerization by motor molecules
Creators: name: Klein, Gernot A.
name: Kruse, Karsten
name: Cuniberti, Gianaurelio
name: Juelicher, Frank
Publisher: name: arXiv
Year: 2005
Subjects: subject: Subcellular Processes (q-bio.SC)
subject: FOS: Biological sciences

description: Motor proteins that specifically interact with the ends of cytoskeletal filaments can induce filament depolymerization. A phenomenological description of this process is presented. We show that under certain conditions motors dynamically accumulate at the filament ends. We compare simulations of two microscopic models to the phenomenological description. The depolymerization rate can exhibit maxima and dynamic instabilities as a function of the bulk motor density for processive depolymerization. We discuss our results in relation to experimental studies of Kin-13 family motor proteins.
EControl: Fast Distributed Optimization with Compression and Error Control.
Creators: name: Gao, Yuan
name: Islamov, Rustem
name: Stich, Sebastian
Publisher: name: CISPA
Year: 2024

description: Modern distributed training relies heavily on communication compression to reduce the communication overhead. In this work, we study algorithms employing a popular class of contractive compressors in order to reduce communication overhead. However, the naive implementation often leads to unstable convergence or even exponential divergence due to the compression bias. Error Compensation (EC) is an extremely popular mechanism to mitigate the aforementioned issues during the training of models enhanced by contractive compression operators. Compared to the effectiveness of EC in the data homogeneous regime, the understanding of the practicality and theoretical foundations of EC in the data heterogeneous regime is limited. Existing convergence analyses typically rely on strong assumptions such as bounded gradients, bounded data heterogeneity, or large batch accesses, which are often infeasible in modern machine learning applications. We resolve the majority of current issues by proposing EControl, a novel mechanism that can regulate error compensation by controlling the strength of the feedback signal. We prove fast convergence for EControl in standard strongly convex, general convex, and nonconvex settings without any additional assumptions on the problem or data heterogeneity. We conduct extensive numerical evaluations to illustrate the efficacy of our method and support our theoretical findings
Flavour-changing neutral current processes beyond the Standard Model
Creators: name: Kachanovich, Aliaksei
Publisher: name: Karlsruher Institut für Technologie (KIT)
Year: 2021
Subjects: Higgs
Higgs portal
FCNC
Standard Model

description: In dieser Arbeit untersuche ich, im Rahmen von Lösungen des Dunkle-Materie-Problems, seltene Zerfälle in der Higgs- und $B$-Physik. Ich werde alle Aspekte und Techniken diskutieren, die zur Durchführung der Rechnungen benötigt werden. In dieser Arbeit hebe ich Mechanismen zur Unterdrückung von flavour-ändernden neutralen Strömen, wie beispielsweise $b \to s(d) X$, hervor. Ich werde ebenso die Rolle eines fundamentalen Skalars im Standardmodell aufzeigen.
London Transport posters: from publicity materials to museum exhibits
Creators: name: Amornchat Sermcheep
Publisher: name: University of Leicester
Year: 2021
Subjects: Uncategorized

description: This PhD thesis traces the museum’s repurposing of publicity posters into museum exhibits from a material cultural perspective. Its aim is to understand how the values and meanings of advertising materials transform as their functions and purposes are altered. In so doing, this thesis employs object itineraries as the theoretical framework, using the London Transport Museum’s collection as a case study.This thesis argues that the values and meanings of London Transport posters change but each point in the transformation is integrally connected to one another. Through the examination of the purposes and narratives of poster exhibitions and the curating process, the change and connection in values and meanings are manifested at both the visual and material levels, such as within a poster design as well as across different material forms.By examining the criteria for selecting London Transport posters for display and their materialities, this thesis also reveals the diversity of the material forms bearing a single poster design and provides insight into the impact of object materialities, especially their multiplicity, on both collection management and exhibition making.Further, this thesis engages the primary data with debates about the notions of object originality and authenticity. It argues that museums interact with original objects in certain ways in order to maintain, manifest and highlight the authenticity of these objects. This is mainly to serve the museum’s knowledge shaping purpose. Despite that, this thesis concludes that museums should not consider themselves superior to material objects. Instead, the thesis proposes a view of museums as space for human-thing interactions.Overall, while focussing on advertising materials, the research provides new insight into the nature of museum objects more generally as well as humans’ interactions with them. This thesis therefore contributes to various material culture-related academic domains including critical museum studies, anthropology and archaeology.
Griechische Philosophie in den "Kommentaren" des Joane Petrizi zur "Elementatio Theologica" des Proklos
Creators: name: Alexidse, Lela
Publisher: name: Oriens christianus : Hefte für die Kunde des christlichen Orients
Year: 2024

description: Oriens christianus : Hefte für die Kunde des christlichen Orients, Bd. 81 (1997): Oriens christianus, Band 81
Transient flow and transport in unsaturated heterogeneous media : field experiments in mine waste rock
Creators: name: Nichol, Craig Ferguson
Publisher: name: University of British Columbia
Year: 2009

description: It is essential to understand how water is transported and stored in mine waste rock to predict the rates and quantities of mineral weathering products released to the environment. The lack of understanding of flow mechanisms is the largest of the difficulties facing efforts to predict waste rock leaching. A large scale (8m x 8m x 5m high) constructed waste rock pile experiment (CPE) has been built upon a contiguous grid of 16 drainage lysimeters to better characterize the flow of water in unsaturated waste rock. The measurement of water flow parameters in a waste rock experiment required the development and testing of new instrument methods to determine water content, using time domain reflectrometry (TDR), and matric suction, using thermal conductivity sensors. The use of a resistive coating on the TDR probe conductors is found to be a successful strategy for obtaining measurable TDR signals and hence water contents. The thermal conductivity sensors are successful in certain soil conditions, but not those present in the CPE. Water flow data from the first two and a half years of the experiment are examined. Average net infiltration to an uncovered waste rock pile is 55% of precipitation. Large rainfall events have net infiltration of 55% to 85%. Water flow is spatially heterogeneous at scales less than 2m. In-situ instrumentation is found to be a poor (non-conservative) predictor of water flow. Data are analysed from the first year of a tracer test carried out under transient infiltration. Physical mechanisms of water flow are identified including noncapillary flow, flow in macropores, and water flow in the granular matrix. Water chemistry is different between different pore sizes, and between spatially distinct areas of the pile. The residence time distribution has an estimated mean of 3.0 to 3.9 years under average infiltration conditions.
A taxonomy survey of decision support systems in agriculture
Creators: name: Manos, Basil D.
name: Ciani, Adriano
name: Bournaris, Thomas
name: Vassiliadou, I.
name: Papathanasiou, J.
name: Manos, Basil D.
name: Ciani, Adriano
name: Bournaris, Thomas
name: Vassiliadou, I.
name: Papathanasiou, J.
Publisher: name: Unknown
Year: 2004
Subjects: Risk and Uncertainty

description: This paper presents the results of a research concerning the type, category and fields of applications of Decision Support Systems (DSS) and their contribution to decision-making in agriculture, mainly in the fields of planning and management of farms, farm regions and agricultural resources. More specifically, the paper includes a taxonomy survey that has been based on an analysis of all published works on applications of DSS from 1987 to 2001, as well as a categorized presentation of these applications. The relevant classification of DSS is made by treating subject (theoretical DSS or applicative), the source of publication (proceedings, scientific journal or dissertation), the type of DSS (Decision Support System, Expert System or Knowledge Based DSS), the operational research model that each one DSS uses, the operational field (Diagnostic Forecasting, Advisory, Control, Educational Informational, Operational), the category of decisions (Strategic or Tactic planning decision) and the year of application. The basic concepts and characteristics of DSSs along with the important role that they play in the decision-making process in agriculture, are also described at the beginning of this paper.
Anisotropic dual-continuum representations for multiscale poroelastic materials: Development and numerical modelling
Creators: name: Ashworth, Mark
name: Doster, Florian
Publisher: name: arXiv
Year: 2020
Subjects: subject: Geophysics (physics.geo-ph)
subject: Computational Engineering, Finance, and Science (cs.CE)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Dual-continuum (DC) models can be tractable alternatives to explicit approaches for the numerical modelling of multiscale materials with multiphysics behaviours. This work concerns the conceptual and numerical modelling of poroelastically coupled dual-scale materials such as naturally fractured rock. Apart from a few exceptions, previous poroelastic DC models have assumed isotropy of the constituents and the dual-material. Additionally, it is common to assume that only one continuum has intrinsic stiffness properties. Finally, little has been done into validating whether the DC paradigm can capture the global poroelastic behaviours of explicit numerical representations at the DC modelling scale. We address the aforementioned knowledge gaps in two steps. First, we utilise a homogenisation approach based on Levin's theorem to develop a previously derived anisotropic poroelastic constitutive model. Our development incorporates anisotropic intrinsic stiffness properties of both continua. This addition is in analogy to anisotropic fractured rock masses with stiff fractures. Second, we perform numerical modelling to test the dual-continuum model against fine-scale explicit equivalents. In doing, we present our hybrid numerical framework, as well as the conditions required for interpretation of the numerical results. The tests themselves progress from materials with isotropic to anisotropic mechanical and flow properties. The fine-scale simulations show anisotropy can have noticeable effects on deformation and flow behaviour. However, our numerical experiments show the DC approach can capture the global poroelastic behaviours of both isotropic and anisotropic fine-scale representations.
Study of breath-by-breath ventilatory variability in obstructive pulmonary disease patients
Creators: name: Gasmi, Amin
name: Hautier, Christophe A.
Publisher: name: figshare
Year: 2020
Subjects: subject: 110203 Respiratory Diseases
subject: FOS: Clinical medicine
subject: 110699 Human Movement and Sports Science not elsewhere classified
subject: FOS: Health sciences
subject: 111603 Systems Physiology
subject: FOS: Basic medicine
subject: 110602 Exercise Physiology
subject: 111699 Medical Physiology not elsewhere classified

description: The aim of this study was to explore the dynamic of ventilatory tidal volume variability (VVVt) during exercise and to study the relationship between this variability and maximal oxygen uptake (VO2max) in patients with chronic obstructive pulmonary disease (COPD) at different stages of severity. Thirty nine (39) patients (age = 54.74 years ± 12.90, weight = 14.30 kg ± 71.00, VO2max = 26.05 ml / kg / min ± 6.35) with COPD have agreed to participate to this study and were divided into three groups, each one corresponding to a stage of severity (stage I, II, III). Patients performed a respiratory functional exploration test during exercise over which we have collected data of instantaneous tidal volume for each patient both at rest and exercise. The VVVt was estimated by calculating the coefficient of variation of the tidal volume (CVVt) breath by breath within each power level. The results of this research show significant intragroup differences at both the Friedman (P <0.001) and the Wilcoxon (P<0,003) tests between the CVVt and relative power. There was also significant intergroup differences in the Kruskal-Wallis test (P <0.01) and in the Mann & Whitney test (P <0.05) between the CVVt of each relative power level. The correlations calculated via Pearson coefficient showed no significance between CVVt and VO2max in the three groups. Actually, this study shows a proportionally inverse relationship between the VVVt and exercise power whatever the severity stage is. This latter is also an inhibiting factor of the VVVt.
Distributed quantum computation via optical fibres
Creators: name: Serafini, Alessio
name: Mancini, Stefano
name: Bose, Sougato
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate the possibility of realising effective quantum gates between two atoms in distant cavities coupled by an optical fibre. We show that highly reliable swap and entangling gates are achievable. We exactly study the stability of these gates in presence of imperfections in coupling strengths and interaction times and prove them to be robust. Moreover, we analyse the effect of spontaneous emission and losses and show that such gates are very promising in view of the high level of coherent control currently achievable in optical cavities.
description: 4 pages, 4 figures; substantial revision, references added; accepted for publication
Exports of Greek Fresh Produce to UK: An Analysis of the Barriers to and the Conditions for Successful Export Performance
Creators: name: Vlachos, Ilias P.
name: Patsis, P.G.
name: Vlachos, Ilias P.
name: Patsis, P.G.
Publisher: name: Unknown
Year: 2004
Subjects: International Relations/Trade

description: Greek fresh produce face increasing competition in European markets which pose a threat to successful export performance. UK market is characterised by intense competition, stringent quality standards, and value for money. In this market, two products of great importance to Greek economy, namely oranges and grapes, have shown diametric performance. Using case research, this study identified and assessed the barriers to and the conditions for successful export performance in UK market for Greek fresh produce. Five UK importing organisations and Seven Greek exporting organisations of fresh produce participated in the study. Findings are discussed under five major categories: the geographical distance; infrastructure; farming practices; exporter's strategies, and competitive advantage. Results indicate that successful performance requires the formulation of strong alliances among exporters to pursue export marketing management, seek support from the Greek government, foster long-term relationships with foreign trading partners, and establish recognisable Greek brand names as a means to costumer loyalty.
Die äthiopischen Handschriften des Völkerkundemuseums der Universität Zürich (zweiter Teil)
Creators: name: Six, Veronika
Publisher: name: Oriens christianus : Hefte für die Kunde des christlichen Orients
Year: 2024

description: Oriens christianus : Hefte für die Kunde des christlichen Orients, Bd. 81 (1997): Oriens christianus, Band 81
Interest of lumbar traction in the treatment of lumbosciatica with herniated disc
Creators: name: Gasmi, Amin
name: Gasmi, Halima
Publisher: name: figshare
Year: 2020
Subjects: subject: 110322 Rheumatology and Arthritis
subject: FOS: Clinical medicine
subject: 110321 Rehabilitation and Therapy (excl. Physiotherapy)
subject: 110317 Physiotherapy

description: Quatre vingt seize patients sédentaires dont 46 de sexe masculin (âge : 42,5 ± 5,6ans ; poids : 76,1 ± 7,9kg) et 50 de sexe féminin (âge : 46,2 ± 4,7ans ; poids : 88,4 ± 8,7kg) atteints de lombosciatalgie d’origine discale ont participé volontairement à cette étude. L’échantillon a été divisé en deux groupes. Chacun des deux groupes comprenait 48 patients dont 23 de sexe masculin et 25 de sexe féminin. Durant la phase aigüe de la maladie les deux groupes recevaient le même traitement par anti-inlammatoires non stéroïdiens par voie intramusculaire (Diclofenac 75mg/j) durant les six premiers jours, pendant cette période les patients observaient un repos strict au lit. Après la phase aigue et à partir du septième jour le traitement par voie intramusculaire est remplacé par un traitement oral par Célebrex (Célécoxib) d’une dose quotidienne de 200mg pendant 10 jours. Durant cette période les patients des deux groupes se sont livrés progressivement à leurs activités quotidiennes. Après les dix-septjours de traitement médicamenteux les patients du groupe 2 ont suivi une mécanothérapie par traction lombaire à partir du dix huitième jour de l’expérimentation pendant 5 séances quotidiennes de 15 minutes chacune tandis que les patients du groupe 1 n’avait reçu aucun traitement de mécanothérapie durant cette période. Les résultats de cette expérience ont montré une nette centralisation de la douleur et une diminution significative de son intensité chez les patients du groupe expérimental. La centralisation du nucléus polpisus a été décelée à l’examen IRM effectué avant et après l’expérience chez 25 patients du groupe expérimental, alors que le groupe témoin n’a présenté aucune centralisation significative du nucléus polpisus. Il est évident que la traction lombaire est une thérapie de choix dans le traitement des patients atteints de lombosciatalgie par hernie discale chez les deux sexes car elle permet de réduire l’intensité de la douleur et de la centraliser au niveau lombaire dans plus de 25% des cas. Elle permet aussi de recentraliser le nucléus polpisus de façon significative et dans plus de 50% des cas.
Divergent Perturbation Series
Creators: name: Suslov, I. M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Other Condensed Matter (cond-mat.other)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Various perturbation series are factorially divergent. The behavior of their high-order terms can be found by Lipatov's method, according to which they are determined by the saddle-point configurations (instantons) of appropriate functional integrals. When the Lipatov asymptotics is known and several lowest order terms of the perturbation series are found by direct calculation of diagrams, one can gain insight into the behavior of the remaining terms of the series. Summing it, one can solve (in a certain approximation) various strong-coupling problems. This approach is demonstrated by determining the Gell-Mann - Low functions in ϕ^4 theory, QED, and QCD for arbitrary coupling constants. An overview of the mathematical theory of divergent series is presented, and interpretation of perturbation series is discussed. Explicit derivations of the Lipatov asymptotic forms are presented for some basic problems in theoretical physics. A solution is proposed to the problem of renormalon contributions, which hampered progress in this field in the late 1970s. Practical schemes for summation of perturbation series are described for a coupling constant of order unity and in the strong-coupling limit. An interpretation of the Borel integral is given for 'non-Borel-summable' series. High-order corrections to the Lipatov asymptotics are discussed.
description: Review article, 45 pages, PDF
Vestibular rehabilitation in patients with Benign Paroxysmal Positional Vertigo (BPPV)
Creators: name: Gasmi, Amin
name: Nassima Bouguerra
Publisher: name: figshare
Year: 2020
Subjects: subject: 110321 Rehabilitation and Therapy (excl. Physiotherapy)
subject: FOS: Clinical medicine
subject: 110317 Physiotherapy
subject: 110315 Otorhinolaryngology

description: The aim of this work was to identify the methods, technics and methodologies used in the physical treatment of the Benign Paroxysmal Positional Vertigo (BPPV). This work is presented as an initiation to the practical principles of vestibular rehabilitation with an application of these methods to patients suffering from vertigo.
Teleseismic investigation of the upper mantle beneath the Archean Slave craton, NW Canada, and of the Moho beneath Canadian broad-band stations
Creators: name: Bank, Carl-Georg
Publisher: name: University of British Columbia
Year: 2009

description: In this thesis I apply various algorithmic techniques to teleseismic data with a twofold objective: to investigate upper mantle structure beneath the Archean Slave craton to gain an understanding of early craton formation and kimberlite genesis, and to characterize elastic properties, including anisotropy, at Moho levels beneath Canadian seismic stations. The Archean Slave craton is the site of the oldest known rocks on Earth and of numerous diamondiferous kimberlites. The Yellowknife seismic array and 13 temporary stations recorded teleseisms between November 1996 and May 1998. P-wave travel-time tomography reveals the oldest part of the craton, the Central Slave Basement Complex, to be underlain by the fastest seismic velocities. Receiver function analysis requires only the Moho as a major 5-wave velocity discontinuity and points to a fairly constant crustal thickness throughout the craton. SKS splitting analysis shows little variation in results across the array, supporting present-day plate motion as the primary cause for mantle fabric beneath the area. Furthermore, the Mackenzie plume seems to not have had any seismologically detectable effect on the Slave lithosphere. I speculate on a genetic link between a low seismic velocity anomaly at depth with the overlying Lac de Gras kimberlite field. To characterize elastic properties at Moho levels beneath Canadian broadband stations I use the Moho P-to-5 converted phase in the P-coda, and linearized scattering theory combined with singular value decomposition. I first identify those parameter combinations to which idealized teleseismic data sets are most sensitive. Five independent parameter combinations are potentially resolvable, one of which is sensitive to isotropy whereas the remainder quantify different harmonic orders (19 and 29) of back-azimuthal response. I then use these parameter combinations to compare Moho anisotropy at 25 sites. The isotropic component dominates at all stations and corresponds to shear velocity contrasts across the Moho ranging between 10 and 35 percent. Perturbations to anisotropic material property parameters are more modest, generally between 3 and 7 percent when consistent between SV and SH responses, and in many cases suggest an anisotropic lower crust. Inconsistent responses may manifest contamination by lateral heterogeneity, upper crustal reverberations, or pervasive crustal anisotropy leading to shear-wave splitting.
The influence of management accounting use on farm inefficiency
Creators: name: Puig-Junoy, Jaume
name: Argiles, Josep M.
name: Puig-Junoy, Jaume
name: Argiles, Josep M.
Publisher: name: Unknown
Year: 2004
Subjects: Farm Management

description: This paper aims to estimate a translog stochastic frontier production function with panel data of 147 mixed Catalan farms in a five-year period. The mean output efficiency in the period analysed was estimated to be 62.3%. We added management variables to the traditional factors explaining farm efficiency, and found that fully integrated management based on reliable accounting information and comprising planning and control phases reveals to be a significant factor positively affecting farm efficiency. Farm efficiency levels were also found to be positively influenced by farm size, while rented and irrigated area influence negatively farm efficiency levels.