cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Almost everywhere convergent sequences of weak$^*$-to-norm continuous operators
Creators: name: Rodríguez, José
Publisher: name: arXiv
Year: 2020
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 46B28, 46G10

description: Let $X$ and $Y$ be Banach spaces, and $T:X^*\to Y$ be an operator. We prove that if $X$ is Asplund and $Y$ has the approximation property, then for each Radon probability $μ$ on $(B_{X^*},w^*)$ there is a sequence of $w^*$-to-norm continuous operators $T_n:X^*\to Y$ such that $\|T_n(x^*)-T(x^*)\| \to 0$ for $μ$-a.e. $x^*\in B_{X^*}$; if $Y$ has the $λ$-bounded approximation property for some $λ\geq 1$, then the sequence can be chosen in such a way that $\|T_n\|\leq λ\|T\|$ for all $n\in \mathbb{N}$. The same conclusions hold if $X$ contains no subspace isomorphic to $\ell_1$, $Y$ has the approximation property (resp., $λ$-bounded approximation property) and $T$ has separable range. This extends to the non-separable setting a result by Mercourakis and Stamati.
Concentration of the trade and the small-scale fruit and vegetable producers – practices in Hungary and in the European Union
Creators: name: Kurti, Andrea
name: Kozak, Anita
name: Seres, Antal
name: Kurti, Andrea
name: Kozak, Anita
name: Seres, Antal
Publisher: name: Unknown
Year: 2010
Subjects: subject: International Relations/Trade
subject: Concentration
subject: food retail chains
subject: supply
subject: small-scale producers
subject: fruits and vegetables

description: This study examines the conflicts arising from the requirements of the food retail chains and their possible solutions, based on an analysis of the foreign and domestic trade literature and on a domestic assessment of 2008. Direct supplies from small-scale producers have future prospects only in the field of niche market products. Only production organisations integrating small-scale producers may be successful in the supply of large quantity products of homogeneous quality. In Hungary, similar organisations – principally POs – still do not have a role comparable to that they fulfil in more developed countries of the European Union in the field of the supplies to the food retail chains. For increasing supplies, the domestic small-scale producers should change their mentality, and increase their adaptability and marketing-oriented innovative skills. The state, on the other hand, should grant assistance in mitigating the lack of capital due to the small-scale production and support more efficiently the increasing role of the different producer organisations, especially of the POs.
Intra-industry trade of Hungarian agricultural products and the EU-accession
Creators: name: Jambor, Attila
name: Jambor, Attila
Publisher: name: Unknown
Year: 2010
Subjects: subject: International Relations/Trade
subject: EU-accession
subject: agriculture
subject: intra-industry trade

description: This paper analyses structural changes in Hungarian agricultural trade after EU accession, especially considering intra-industry trade. Results suggest that EU accession raised the intensity of trade contacts but had a negative impact on trade balance. After accession, national agricultural exports by countries and products has shown a high but decreasing level of concentration, while in the case of agricultural imports, concentration was increasingly high by country and constantly low by product. Agricultural trade between Hungary and EU-15 is basically inter-industrial in nature, though the role of intra-industry trade is increasing.
Statistical avalanche forecating using meteorological data from Bear Pass, British Columbia, Canada
Creators: name: Floyer, James Antony
Publisher: name: University of British Columbia
Year: 2009

description: A framework is presented for a numerical prediction scheme with a prediction accuracy of greater than 70% at Bear Pass, British Columbia, Canada. One way analysis of variance and canonical discriminant analysis are used to identify the principal variables that allow discrimination between avalanche and non-avalanche time periods. The optimum variable set is then used in a Mahalanobis-metric nearest neighbours model to determine the observations in the historical database that most closely represent conditions of the forecast period. The information about these neighbours can be used by the forecaster to aid in making an avalanche forecast. In this study, a univariate analysis of the meteorological and snowpack data from The Pass is used to assess the contribution of each of the variables for use in avalanche prediction. Using these data, the snow-climate of the area is assessed and it is shown that Bear Pass may be classified as a maritime snow climate, although some elements of a transitional snow-climate are evident. A canonical discriminant analysis is performed for both a two-group discrimination into avalanche and non-avalanche periods and for a three-group discrimination into wet, dry and non-avalanche periods. For the three-group discrimination, a two-stage discrimination is preferred, involving first discriminating into wet-avalanche or dry-avalanche periods and then discriminating between wet or dry-avalanche and non-avalanche periods. The analysis is performed for all areas in a combined analysis and also for individual sub-areas defined within The Pass. Improvements on classification rates to three out of the four sub-areas are found compared to the analysis for the whole Pass. Various parameters that affect the nearest neighbour model performance are analyzed. The effect of group size distribution is assessed, as well as the number and threshold number of neighbours that form the basis for the forecast decision. The effect of dimensionality on the model is also analyzed. The Mahalanobis-metric nearest neighbours model is compared to Cornice, a nearest neighbours model developed for avalanche forecasting in Scotland. Classification rates for the two models are found to be very similar. Finally, preliminary findings from a new method using time patterns of predictor variables is presented. The method makes use of time series data from remote weather stations. Sections of the time series are similar to present conditions are identified through a deconvolution process. It is hoped that this method may offer improvements to the conventional nearest neighbours method by implicitly assuming that meteorological conditions are correlated in time.
Images in Christmas Balls
Creators: name: van Beveren, Eef
name: Kleefeld, Frieder
name: Rupp, George
Publisher: name: arXiv
Year: 2005
Subjects: subject: Physics Education (physics.ed-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We describe light-reflection properties of spherically curved mirrors, like balls in the Christmas tree. In particular, we study the position of the image which is formed somewhere beyond the surface of a spherical mirror, when an eye observes the image of a pointlike light source. The considered problem, originally posed by Abu Ali Hasan Ibn al-Haitham -- alias Alhazen -- more than a millennium ago, turned out to have the now well known analytic solution of a biquadratic equation, being still of great relevance, e.g. for the aberration-free construction of telescopes. We do not attempt to perform an exhaustive survey of the rich historical and engineering literature on the subject, but develop a simple pedagogical approach to the issue, which we believe to be of continuing interest in view of its maltreating in many high-school textbooks.
description: 13 pages, 7 figures plain LaTeX; Also see http://cft.fis.uc.pt/eef/mirrors.htm, revised version has simplified formulas, more transparent for a wider audience, one reference added
Scambi commerciali agricoli e accordi di partenariato tra Unione Europea e Africa
Creators: name: Bernini Carri, Carlo
name: Sassi, Maria
name: Bernini Carri, Carlo
name: Sassi, Maria
Publisher: name: Unknown
Year: 2008
Subjects: subject: Agricultural Trade
subject: Trade and Development
subject: Agricultural Competitiveness

description: The Cotonou Partnership Agreement, signed on 2000, marks the beginning of a new cooperation phase between ACP countries and the EU. The IV pillar of the Agreement, aimed at the creation of a free trade area, concerns the economic and trade cooperation and is targeted to make trade in line with the WTO rules and to allow the ACP countries a full participation to international trade understood as strategic condition for supporting growth and development. In this context, the trade relationships between the EU and Africa are of specific importance when referred to agricultural products. The liberalization process might have a significant impact for the EU as leading world exporter and importer of agricultural goods and the wider destination and origin market of the African food and agricultural products. On the African side, agricultural export are often the primary source of foreign exchange for food imports required for domestic food security. Furthermore, the new Partnership Agreement creates an additional market access only for the agricultural products that, however, might results strongly constrained by the limited supply potential and high EU SPS standards. Thus, the analysis of the costs and benefits connected to the liberalization process in both the EU and Africa is relevant for a better understanding of the forthcoming competitive scenario for the agricultural products. This is the topic of the paper that, with reference to the time period from 1995-2006, provides a preliminary analysis of the main features of the agricultural trade flows between the EU-25 and Africa; the competitive potential of the sector; the explanatory variables of the African export flows trends to the EU-25. Despite the EU is negotiating an Agreement with the African countries as a whole, the analysis also distinguishes among geographic areas in order to estimate the likely different impact of agricultural trade liberalization. To the same aim food and agricultural product are considered separately.
Work and Digital Technologies. A Proposal for Analysis
Creators: name: Gosetti, Giogio
Publisher: name: Italian Sociological Review
Year: 2024

description: This article aims to review the digitalization of work by adopting a multidimensional analytical perspective on the quality of working life that examines the different aspects of working conditions. It is divided into three sections: (1) contextualization of digitalization as part of certain changes already underway, (2) determination of the specific nature of digitalization, (3) presentation of the features of the analytical framework to study quality of working life and feasible ways to study the impact of digitalization. It is not within the scope of this paper to provide an overview of literature on the effects of digitalization. Instead, it offers a conceptual-methodological basis for the interpretation of digitalization, focusing on field analysis.
description: Italian Sociological Review, Vol. 14 No. 1 (2024)
Renormalization of the singular attractive $1/r^4$ potential
Creators: name: Alberg, Mary
name: Bawin, Michel
name: Brau, Fabian
Publisher: name: arXiv
Year: 2004
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: Atomic and Molecular Clusters (physics.atm-clus)
subject: FOS: Physical sciences

description: We study the radial Schrödinger equation for a particle of mass $m$ in the field of a singular attractive $g^2/{r^4}$ potential with particular emphasis on the bound states problem. Using the regularization method of Beane \textit{et al.}, we solve analytically the corresponding ``renormalization group flow" equation. We find in agreement with previous studies that its solution exhibits a limit cycle behavior and has infinitely many branches. We show that a continuous choice for the solution corresponds to a given fixed number of bound states and to low energy phase shifts that vary continuously with energy. We study in detail the connection between this regularization method and a conventional method modifying the short range part of the potential with an infinitely repulsive hard core. We show that both methods yield bound states results in close agreement even though the regularization method of Beane \textit{et al.} does not include explicitly any new scale in the problem. We further illustrate the use of the regularization method in the computation of electron bound states in the field of neutral polarizable molecules without dipole moment. We find the binding energy of s-wave polarization bound electrons in the field of C$_{60}$ molecules to be 17 meV for a scattering length corresponding to a hard core radius of the size of the molecule radius ($\sim 3.37$ Å). This result can be further compared with recent two-parameter fits using the Lennard-Jones potential yielding binding energies ranging from 3 to 25 meV.
description: 8 pages
title: 2013 Faculty Conference: student life update
Creators: name: Fox, Daniel
Publisher: name: Mountain Scholar
Year: 2007

description: This presentation gives a summary of student information. The follwowing topics are included: 1) a 5-year summary of the number of incoming and transfer students and SAT/ACT scores, 2) 2013 demographics, 3) 3-year undergraduate enrollment numbers, 4) advanced placement credit distribution and 5) highlights from CASA and faculty.
HYPERTENSION AND CARDIOVASCULAR DISEASE
Creators: name: Norboyeva, Sevara
Publisher: name: Zenodo
Year: 2024

description: The fragmented nature of previous research has obscured a comprehensive understanding of the causes of cardiovascular disease (CVD). Among the risk factors, high blood pressure (BP) has the strongest evidence for causality and a high prevalence. Normal biological levels of BP are significantly lower than what has traditionally been considered normal in both research and clinical practice. We propose that CVD is largely driven by a rightward shift in the population distribution of BP. Our view, which positions BP as the primary risk factor for CVD, is supported by conceptual frameworks tested in observational studies and clinical trials. Large cohort studies have identified high BP as a major risk factor for heart failure, atrial fibrillation, chronic kidney disease, heart valve disorders, aortic syndromes, and dementia, in addition to coronary heart disease and stroke. Multivariate modeling has shown that the attributable risk of high BP for stroke and coronary heart disease has increased as definitions of normal BP have shifted to lower values. Meta-analyses of BP-lowering randomized controlled trials have shown benefits closely matching predictions based on BP risk relationships in cohort studies. Preventing age-related increases in BP, along with intensive treatment of established hypertension, could significantly reduce the vascular outcomes typically associated with aging and alleviate much of the population's burden of BP-related CVD.
Shattered matchings in intersecting hypergraphs
Creators: name: Frankl, Peter
name: Pach, Janos
Publisher: name: arXiv
Year: 2020
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: Primary: 05D05, 05C65, 05D40

description: Let $X$ be an $n$-element set, where $n$ is even. We refute a conjecture of J. Gordon and Y. Teplitskaya, according to which, for every maximal intersecting family $\mathcal{F}$ of $\frac{n}2$-element subsets of $X$, one can partition $X$ into $\frac{n}2$ disjoint pairs in such a way that no matter how we pick one element from each of the first $\frac{n}2 - 1$ pairs, the set formed by them can always be completed to a member of $\mathcal{F}$ by adding an element of the last pair. The above problem is related to classical questions in extremal set theory. For any $t\ge 2$, we call a family of sets $\mathcal{F}\subset 2^X$ {\em $t$-separable} if for any ordered pair of elements $(x,y)$ of $X$, there exists $F\in\mathcal{F}$ such that $F\cap\{x,y\}=\{x\}$. For a fixed $t, 2\le t\le 5$ and $n\rightarrow\infty$, we establish asymptotically tight estimates for the smallest integer $s=s(n,t)$ such that every family $\mathcal{F}$ with $|\mathcal{F}|\ge s$ is $t$-separable.
description: 12 pages
Self-Perception of Young University Students About Their Leisure Time Before, During and After COVID-19. An Approach to the Spanish Context
Creators: name: López-Noguero, Fernando
name: Sevillano-Monje, Verónica
name: Gallardo-López, José Alberto
name: García-Lázaro, Irene
Publisher: name: Italian Sociological Review
Year: 2024

description: The aim of this research is to explore and analyse the self-perception of a group of young Spanish university students in relation to their leisure activities, in a temporal space defined in three moments: before the COVID-19 pandemic, during the confinement and after the confinement (return to normality). Information was collected with a self-administered questionnaire to 54 young Spaniards. The results show that before the pandemic, leisure was in person with activities shared with friends. During confinement, leisure was non-face-to-face, significantly increasing family and individual activities. After the confinement, the time that young people spent with their family was reduced, and the time with friends in person and outdoors with “post-COVID” concerns increased. It is concluded that young people have changed their guidelines, activities and with whom they spend their leisure time in comparison to their experience before and during confinement. The return to normality has also changed how young people spend their leisure time, and with whom, by adopting preventive behaviors.
description: Italian Sociological Review, Vol. 14 No. 1 (2024)
Nuove dinamiche nel commercio dei prodotti agroalimentari: resistenze all’adozione dell’e-commerce nelle relazioni business-to-business
Creators: name: Pignatti, Erika
name: Spadoni, Roberta
name: Canavari, Maurizio
name: Pignatti, Erika
name: Spadoni, Roberta
name: Canavari, Maurizio
Publisher: name: Unknown
Year: 2008
Subjects: subject: E-commerce
subject: B2B Transactions
subject: Agrifood Products
subject: Standardization
subject: Quality Requirement

description: Since some decades, agrifood products exchanges can be carried on using Information and Communication Technology (ICT) tools. Anyway, their adoption in the agrifood sector appears to be hindered, both because of consolidated dynamics in developing B2B transactions, and of the peculiarities of the agrifood products themselves. The lack of direct relationships between partners heighten problems connected with food safety assessments, and with the definition of standardized production practices able to match business partners’ needs. Standardization is the key point in the relationship between e-commerce and agrifood sector. As for some products it is possible to define standardized requirements, it is hard to find a collocation for the wide range of agrifood differentiated and quality products in e-commerce B2B relationships. Moreover, existing e-marketplaces are not always able to convey properly the degree of differentiation and the peculiarities of agrifood products. The study aims at analyzing the barriers connected with the adoption of e-commerce in B2B relationships in agrifood sector, defining the factors which affect the interaction between the two areas. The attitude towards e-commerce showed by potential ICT tools users, chosen between Italian agrifood operators, has been analyzed; moreover, an overview on the evolution of agrifood e-marketplaces in the last 5 years has been carried on. The results describe the main problems concerning the adoption of e-commerce in agrifood sector, deeply connected with the agrifood products specifics. In spite of positive outcomes about efficiency and transactions for standardized products, the interaction between ICT tools and agrifood sector’s needs becomes problematic in case of high quality levels and differentiation, which can’t be properly conveyed by e-marketplaces. Results also highlight the role of trust and reputation in e-environments.
Study of thermal behavior for composite material consisted from unsaturated polyester resin reinforced by palms and glass fibers
Creators: name: Kahtan K.Al-Khazraji
name: I.Al-Mosawi, Ali
Publisher: name: figshare
Year: 2020
Subjects: subject: 91202 Composite and Hybrid Materials
subject: FOS: Materials engineering

description: In this work , thermal behavior for composite material consisted from unsaturated polyester resin reinforced by palms fibers is studied and compared it with another material reinforced by glass fibers and then these two types of fibers combined together to make a hybrid composite material and also calculated the range of it's thermal conductivity .Fourier equation used to calculate the thermal conductivity coefficient to obtained composite material and as illustrated in diagrams which represent the relation between thermal conductivity coefficient with temperature.
Caratteristiche e mutamenti del commercio agro-alimentare: un confronto fra Italia ed India
Creators: name: Privitera, Donatella
name: Rognetta, Bernardo
name: Privitera, Donatella
name: Rognetta, Bernardo
Publisher: name: Unknown
Year: 2008
Subjects: subject: Emerging Countries
subject: Trade Indicators
subject: Competitive Pressures

description: This paper examines the product specialisation of Italian trade over the period 2000-2006 to identify the roots of Italy’s sluggish trade performance with respect to India. In particular, the analysis focuses on the role of product specialisation in relation to world trade growth and competition from emerging countries. We used trade indicators to describe and asses the state of trade flows and trade patterns of a particular country like India and also to monitor these flows over time and across countries. Till the early 1990s, India was a closed economy: average tariffs exceeded 200 percent, quantitative restrictions on imports were extensive, and there were stringent restrictions on foreign investment. The country began to cautiously reform in the 1990s, liberalizing only under conditions of extreme necessity. Since that time, trade reforms have produced remarkable results. The economy is now among the fastest growing in the world. This leads some to see India as a ‘rapid globalizer’ while others still see it as a ‘highly protectionist’ economy. India however retains its right to protect when need arises. Agricultural tariffs average between 30-40 percent, anti-dumping measures have been liberally used to protect trade. India is now aggressively pushing for a more liberal global trade regime, especially in services.
They Ain’t Making Any More of It: Agricultural Land Use, Conservation, Conflicts, Development and Energy (PowerPoint)
Creators: name: Richardson, Jesse J.
name: Richardson, Jesse J.
Publisher: name: Unknown
Year: 2009
Subjects: subject: Environmental Economics and Policy
subject: Land Economics/Use
subject: Agriculture
subject: land use
subject: smart growth

description: Discusses land use conflicts between agriculture, conservation, development and energy.
description: Presented to USDA Economists Group, Washington, DC, March 11, 2009
Testing Different Types of Benefit Transfer in Valuation of Ecosystem Services: New Zealand Winegrowing Case Studies
Creators: name: Baskaran, Ramesh
name: Cullen, Ross
name: Colombo, Sergio
name: Baskaran, Ramesh
name: Cullen, Ross
name: Colombo, Sergio
Publisher: name: Unknown
Year: 2009
Subjects: subject: Benefit transfer
subject: choice modeling
subject: New Zealand winegrowing
subject: ecosystem services

description: Most ecosystem services (ES) are neither priced nor marketed. Resource managers may fail to take into account degradation of unpriced services in their resource management decisions. Being able to estimate values for ES is fundamental to designing policies to induce resource users to provide (or improve) ES at levels that are acceptable to society. Conducting ecosystem valuation via non-market methods is costly and time consuming. Benefit Transfer (BT) using choice modeling (CM) is a potentially cost-effective method for valuing ES by transferring information from existing valuation studies (and study sites) to a target area of interest (policy sites). The prime objective of this paper is to examine the validity of BT and hence whether it is feasible to conduct the transfer process and assist policy making. The paper focuses on the environmental impact of winegrowing practices in two New Zealand winegrowing regions. The two sites, Hawke’s Bay and Marlborough, have similar environmental issues and attributes but are geographically separated. The study estimates WTP and Compensating Surplus (CS) for ES applying CM and, subsequently, given the preferences of respondents across sites and populations, tests the transferability of unadjusted value transfer (WTP) and benefits function (CS) assessing four different types of BT.
Stochastic Volterra convolution with Lévy process
Creators: name: Karczewska, Anna
Publisher: name: arXiv
Year: 2004
Subjects: subject: Probability (math.PR)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 60H20

description: In the paper we study stochastic convolution appearing in Volterra equation driven by so called Lévy process. By Lévy process we mean a process with homogeneous independent increments, continuous in probability and cadlag.
description: 11 pages, submitted to Int. J. of Pure and Appl. Math. Some misprints corrected
Effect of hydrostatic pressure on the ambient pressure superconductor CePt_3Si
Creators: name: Nicklas, M.
name: Sparn, G.
name: Lackner, R.
name: Bauer, E.
name: Steglich, F.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We studied the evolution of superconductivity (sc) and antiferromagnetism (afm) in the heavy fermion compound CePt_3Si with hydrostatic pressure. We present a pressure-temperature phase diagram established by electrical transport measurements. Pressure shifts the superconducting transition temperature, T_c, to lower temperatures. Antiferromagnetism is suppressed at a critical pressure P_c=0.5 GPa.
description: 2 pages, 2 figures, proceedings SCES'04
Evaluating alternatives for mitigating Cryptosporidium risk and generating environmental service benefits in water supply catchments
Creators: name: Kandulu, John
name: Bryan, Brett
name: Kandulu, John
name: Bryan, Brett
Publisher: name: Unknown
Year: 2009
Subjects: subject: Cryptosporidium
subject: Catchment management
subject: benefit cost
subject: cost effectiveness

description: Evaluations of pathogen management options have focussed on assessing relative removal effectiveness as a basis for prioritising alternative management investment decisions. Using a case study of the Myponga catchment, South Australia, this paper presents results of a cost-effectiveness risk analysis of 13 catchment- and treatment-based water quality management alternatives for mitigating Cryptosporidium risk. A range of costs and benefits including set-up and operating costs, farm business costs and benefits, and environmental service benefits are considered in comparing the net cost associated with each management alternative. Considering the broader range of costs and benefits changes the relative cost-effectiveness of water quality management alternatives significantly. Combinations of catchment- and treatment-based management alternatives proved to be relatively more cost-effective at mitigating Cryptosporidium risk. Specifically, the combination of spatially targeted water course management upstream of the catchment with reservoir treatment by ultra-violet radiation provides a cost-effective Cryptosporidium risk mitigation strategy especially when the adoption of dung beetles and treatment by enhanced coagulation are included as complementary low cost alternatives. Considering the broader range of costs and benefits enhances the potential to increase the cost-effectiveness of investment in Cryptosporidium risk mitigation as well as produce a range of significant secondary benefits for water quality, biodiversity, and carbon sequestration.
Pseudoscalar Photon Mixing In A Magnetized Medium
Creators: name: Ganguly, Avijit K.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Astrophysics (astro-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Axions are pseudo-scalar particles, those arise because of breaking of Peccei Queen (PQ) symmetry. Axions have a tree level coupling to two photons. As a consequence there exists a tree level coupling of axion to photon in a magnetic field. However, in an external magnetic field, there exists a new loop induced, axion photon vertex, that gives rise to axion photon coupling. The strength of the tree level axion photon coupling in magnetic field is known to be model dependent. However in a magnetic field, the new loop induced coupling has some interesting features. This note discusses the new axion photon vertex in a magnetized medium and the corrections arising from there. The magnitude of the correction to axion photon coupling, because of magnetized vacuum and matter is estimated in this note. While making this estimate we note that the form of the axion photon vertex is related to the axial polarization tensor. This vertex is shown to satisfy the Ward identity. The coupling is shown to have a momentum dependent piece in it. Astrophysical importance of this extra modification is also pointed out.
description: Uses Axodraw.sty
Effect study of magnesium oxide on thermal conductivity of unsaturated polyester resin
Creators: name: Kahtan K.Al-Khazraji
name: I.Al-Mosawi, Ali
Publisher: name: figshare
Year: 2020
Subjects: subject: 91202 Composite and Hybrid Materials
subject: FOS: Materials engineering

description: In The Present Study, The effect of addition of magnesium oxide on thermal conductivity of unsaturated polyester resin is studied. Fourier equation used to calculate the thermal conductivity coefficient before and after addition of magnesium oxide and as illustrated in diagrams which represent the relation between thermal conductivity coefficient with temperature.
Straggler-aware Distributed Learning: Communication Computation Latency Trade-off
Creators: name: Ozfatura, Emre
name: Ulukus, Sennur
name: Gunduz, Deniz
Publisher: name: arXiv
Year: 2020
Subjects: subject: Information Theory (cs.IT)
subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Machine Learning (cs.LG)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: When gradient descent (GD) is scaled to many parallel workers for large scale machine learning problems, its per-iteration computation time is limited by the straggling workers. Straggling workers can be tolerated by assigning redundant computations and coding across data and computations, but in most existing schemes, each non-straggling worker transmits one message per iteration to the parameter server (PS) after completing all its computations. Imposing such a limitation results in two main drawbacks; over-computation due to inaccurate prediction of the straggling behaviour, and under-utilization due to treating workers as straggler/non-straggler and discarding partial computations carried out by stragglers. In this paper, to overcome these drawbacks, we consider multi-message communication (MMC) by allowing multiple computations to be conveyed from each worker per iteration, and design straggler avoidance techniques accordingly. Then, we analyze how the proposed designs can be employed efficiently to seek a balance between the computation and communication latency to minimize the overall latency. Furthermore, through extensive simulations, both model-based and real implementation on Amazon EC2 servers, we identify the advantages and disadvantages of these designs in different settings, and demonstrate that MMC can help improve upon existing straggler avoidance schemes.
description: This paper was presented in part at the 2019 IEEE International Symposium on Information Theory (ISIT) in Paris, France, and at the 2019 IEEE Data Science Workshop in Minneapolis, USA
Transformative dynamics of corruptive systems
Creators: name: Rufino, Annamaria
Publisher: name: Italian Sociological Review
Year: 2024

description: The impact of the global communication system significantly affects the dissemination of corruptive practices, helping to mix truth and falsehood, and confusing the objective interpretation of the dynamics. Corruptive traps get confused with the perception of the emergency. The difficulty of regulatory systems in preventing and correcting the corruption phenomenon contributes to spreading its traps in the social system.
description: Italian Sociological Review, Vol. 14 No. 1 (2024)
GM technology and the Australian canola
Creators: name: Taing, William
name: Ahmadi-Esfahani, Fredoun Z.
name: Taing, William
name: Ahmadi-Esfahani, Fredoun Z.
Publisher: name: Unknown
Year: 2009
Subjects: subject: canola market
subject: genetically modified crops
subject: segregation
subject: welfare.

description: In this paper, we use a simulation model to measure the potential market and welfare effects of recently introduced genetically modified (GM) canola in Australia. The short-run results indicate that non-GM canola may emerge as a niche product commanding a premium. In the long run, GM technology appears to enhance aggregate welfare. However, when production cost savings are trivial and consumers become highly concerned about GM food products, aggregate welfare may decline. The policy implications of the analysis are explored.
A model for the nonlinear dynamics of turbulent shear flows
Creators: name: Garaud, Pascale
name: Ogilvie, Gordon I.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We investigate the nonlinear dynamics of turbulent shear flows, with and without rotation, in the context of a simple but physically motivated closure of the equation governing the evolution of the Reynolds stress tensor. We show that the model naturally accounts for some familiar phenomena in parallel shear flows, such as the subcritical transition to turbulence at a finite Reynolds number and the occurrence of a universal velocity profile close to a wall at large Reynolds number. For rotating shear flows we find that, depending on the Rayleigh discriminant of the system, the model predicts either linear instability or nonlinear instability or complete stability as the Reynolds number is increased to large values. We investigate the properties of Couette-Taylor flows for varying inner and outer cylinder rotation rates and identify the region of linear instability (similar to Taylor's), as well as regions of finite-amplitude instability qualitatively compatible with recent experiments. We also discuss quantitative predictions of the model in comparison with a range of experimental torque measurements. Finally, we consider the relevance of this work to the question of the hydrodynamic stability of astrophysical accretion discs.
description: 32 pages, 15 figures, to be published in J. Fluid Mech
General Axisymmetric Solutions and Self-Tuning in 6D Chiral Gauged Supergravity
Creators: name: Burgess, C. P.
name: Quevedo, F.
name: Tasinato, G.
name: Zavala, I.
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We re-examine the properties of the axially-symmetric solutions to chiral gauged 6D supergravity, recently found in refs. hep-th/0307238 and hep-th/0308064. Ref. hep-th/0307238 finds the most general solutions having two singularities which are maximally-symmetric in the large 4 dimensions and which are axially-symmetric in the internal dimensions. We show that not all of these solutions have purely conical singularities at the brane positions, and that not all singularities can be interpreted as being the bulk geometry sourced by neutral 3-branes. The subset of solutions for which the metric singularities are conical precisely agree with the solutions of ref. hep-th/0308064. Establishing this connection between the solutions of these two references resolves a minor conflict concerning whether or not the tensions of the resulting branes must be negative. The tensions can be both negative and positive depending on the choice of parameters. We discuss the physical interpretation of the non-conical solutions, including their significance for the proposal for using 6-dimensional self-tuning to understand the small size of the observed vacuum energy. In passing we briefly comment on a recent paper by Garriga and Porrati which criticizes the realization of self-tuning in 6D supergravity.
description: 27 pages, 1 figure; JHEP3 style; Some references added, and discussion of tension constraints and unwarped solutions made more explicit
Generation of Magnetic Field in the Pre-recombination Era
Creators: name: Gopal, Rajesh
name: Sethi, Shiv
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We study the possibility of generating magnetic fields during the evolution of electron, proton, and photon plasma in the pre-recombination era. We show that a small magnetic field can be generated in the second order of perturbation theory for scalar modes with adiabatic initial conditions. The amplitude of the field is $\la 10^{-30} \rm G$ at the present epoch for scales from sub-kpc to $\ga 100 \rm Mpc$.
description: 8 pages
The circles-in-the-sky signature for three spherical universes
Creators: name: Aurich, R.
name: Lustig, S.
name: Steiner, F.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The mysteriously low CMB power on the largest scales might point to a Universe which consists of a multi-connected space. In addition to a suppression of large-scale power, a multi-connected space can be revealed by its circles-in-the-sky signature. In this paper, a detailed search for this signature is carried out for those three homogeneous multi-connected spherical space forms that lead to the smallest large-scale power. A simultaneous search for all occurring paired circles is made using filtered CMB sky maps which enhance the ordinary Sachs-Wolfe contribution. A marginal hint is found for the right-handed Poincare dodecahedron at Omega_tot = 1.015 and for the right-handed binary tetrahedral space at Omega_tot = 1.068. However, due to the complicated noise and foreground structure of the available microwave sky maps, we cannot draw firm conclusions from our findings.
Recent Advances in Network-based Methods for Disease Gene Prediction
Creators: name: Ata, Sezin Kircali
name: Wu, Min
name: Fang, Yuan
name: Ou-Yang, Le
name: Kwoh, Chee Keong
name: Li, Xiao-Li
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantitative Methods (q-bio.QM)
subject: Machine Learning (cs.LG)
subject: Molecular Networks (q-bio.MN)
subject: FOS: Biological sciences
subject: FOS: Computer and information sciences

description: Disease-gene association through Genome-wide association study (GWAS) is an arduous task for researchers. Investigating single nucleotide polymorphisms (SNPs) that correlate with specific diseases needs statistical analysis of associations. Considering the huge number of possible mutations, in addition to its high cost, another important drawback of GWAS analysis is the large number of false-positives. Thus, researchers search for more evidence to cross-check their results through different sources. To provide the researchers with alternative low-cost disease-gene association evidence, computational approaches come into play. Since molecular networks are able to capture complex interplay among molecules in diseases, they become one of the most extensively used data for disease-gene association prediction. In this survey, we aim to provide a comprehensive and an up-to-date review of network-based methods for disease gene prediction. We also conduct an empirical analysis on 14 state-of-the-art methods. To summarize, we first elucidate the task definition for disease gene prediction. Secondly, we categorize existing network-based efforts into network diffusion methods, traditional machine learning methods with handcrafted graph features and graph representation learning methods. Thirdly, an empirical analysis is conducted to evaluate the performance of the selected methods across seven diseases. We also provide distinguishing findings about the discussed methods based on our empirical analysis. Finally, we highlight potential research directions for future studies on disease gene prediction.
description: Published in Briefings in Bioinformatics, 05 December 2020
Chinas langer Marsch zur Umweltrevolution: Umweltprobleme und Umweltpolitik der Chinesischen Volksrepublik
Creators: name: Bohnet, Michael
name: Bohnet, Michael
Publisher: name: Unknown
Year: 2008
Subjects: Environmental Economics and Policy
International Relations/Trade

description: Ein rasantes und rücksichtsloses Wirtschaftswachstum bedroht in China die Lebensgrundlagen von mehr als einer Milliarde Menschen. Umweltschutz ist so zu einer wichtigen Aufgabe geworden, der sich die Regierung nicht länger entziehen kann. Oft sind ihre Vorschriften gegen die Interessen in den Provinzen nur schwer durchzusetzen. Trotz solcher Widerstände besteht aber Hoffnung, dass die ökologische Modernisierung des Landes gelingt. Der Autor zeigt in diesem Diskussionspapier, dass es in China trotz verheerender Umweltbilanz sehr wohl Ansätze zu Verbesserung der Umweltpolitik gibt. China beginnt einen „Pfad der grünen Reformen“ anzustreben. Es zeichnen sich tektonische Verschiebungen ab, die sich durch Chinas neue Umweltpolitik ergeben. China hat wichtige umweltpolitische Reformschritte eingeleitet, z.B. erste schritte in Richtung einer ressourcenschonenden Preispolitik in Angriff genommen und Öko-Kompensations-Instrumente eingeführt, ferner sind Umweltinstitutionen im Aufwind, es entstehen Umwelt-NROs und China kooperiert im Umweltbereich intensiv mit dem Ausland, z.B. mit Deutschland . Die ökologische Modernisierung hat- weitgehend unbeachtet von der Weltöffentlichkeit- begonnen, so entstehen ökologische Modellstädte, die Kreislaufwirtschaft schreitet voran, regenerative Energien werden gefördert, ein nationales Klimaschutzprogramm wurde verabschiedet, die Umweltindustrie wird ausgebaut, die Naturreservate wurden verdreifacht und China setzt das größte Wiederaufforstungsprogramm der Welt um. China könnte zu einem Labor für nachhaltige ressourcensparende und umweltschonende Lösungsansätze werden.
description: Environmental politics, China
Comment on "Large Difference in the Elastic Properties of fcc and hcp Hard-Sphere Crystals"
Creators: name: Sushko, Nazar
name: van der Schoot, Paul
Publisher: name: arXiv
Year: 2004
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: As is well known, hard-sphere crystals of the fcc and hcp type differ very little in their thermodynamic properties. Nonetheless, recent computer simulations by Pronk and Frenkel indicate that the elastic response to mechanical deformation of the two types of crystal should be quite different. By invoking a geometrical argument put forward by R. Martin some time ago, we suggest that this is largely due to the different symmetries of the fcc and hcp crystal structures. Indeed, we find that elastic constants obtained by means of computer simulations for the fcc hard-sphere crystal can be mapped onto the equivalent ones of the hcp crystal to very high accuracy. The same procedure applied to density functional theoretical predictions for the elastic properties of the fcc hard-sphere crystal also produces remarkably accurate predictions for those of the hcp hard-sphere crystal.
description: 7 pages, 5 figures
Mechanisms of Notch4-induced inhibition of endothelial sprouting
Creators: name: Mackenzie, Farrell Ian
Publisher: name: University of British Columbia
Year: 2009

description: Notch proteins comprise a family of transmembrane receptors. Ligand activation of Notch releases an intracellular region of the receptor that translocates to the nucleus and regulates transcription through interaction with the DNA-binding protein CBF1. CBF1- independent Notch signalling has also been described. Previously, the human Notch4 intracellular region (N4IC) was shown to inhibit endothelial sprouting in vitro and angiogenesis in vivo. The objective of this study was to determine the N4IC domains required for inhibition of endothelial sprouting and to resolve whether this inhibition involves CBFl-dependent signalling. N4IC contains a RAM domain and six ankyrin repeats for protein binding and a Cterminal region (CT) that has poorly defined function. The necessity of each domain for Notch4 activity in endothelial cells was analysed using human dermal microvascular endothelial cells (HMEC-1) expressing N4IC or N4IC deletion constructs. As shown by immunofluorescent staining, mutants lacking the RAM domain had reduced nuclear localisation. Nuclear targeting was restored by fusion of a viral nuclear localisation signal. The angiogenic effect of the N4IC mutants was quantitated using an in vitro endothelial sprouting assay. Deletion of the ankyrin domain, but not the RAM or CT, abrogated the inhibition of FGF-2- and VEGF-induced sprouting, while the ankyrin repeats alone partially blocked sprouting. N4IC decreased VEGF Receptor 2 (VEGFR2) mRNA expression but did not alter FGF Receptor 1 (FGFR1) levels. Conversely, constructs lacking the RAM or CT increased VEGFR2 mRNA compared to controls. Therefore, Notch4 appears to block endothelial sprouting through mechanisms other than mere downregulation of VEGFR2 and FGFR1. The ankyrin repeats, but not the RAM or CT, were also required for upregulation of CBFl-dependent gene expression as shown by luciferase reporter assays and RT-PCR for endogenous CBF1 targets. The ankyrin domain alone was sufficient to upregulate some, but not all, CBFl-dependent genes. Fusion of CBF1 to a viral transactivation domain created a construct that induced expression of target genes independently of N4IC. This constitutively-active CBF1 significantly inhibited HMEC-1 sprouting, but not as strongly as N4IC. Therefore, the inhibition of endothelial sprouting by N4IC requires the ankyrin repeats and appears to involve CBFl-dependent and -independent signalling.
Modified spin-wave theory of nuclear magnetic relaxation in one-dimensional quantum ferrimagnets: Three-magnon versus Raman processes
Creators: name: Yamamoto, Shoji
name: Hori, Hiromitsu
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Nuclear spin-lattice relaxation in one-dimensional Heisenberg ferrimagnets is studied by means of a modified spin-wave theory. Calculating beyond the first-order mechanism, where a nuclear spin directly interacts with spin waves through the hyperfine coupling, we demonstrate that the exchange-scattering-enhanced three-magnon nuclear relaxation may generally predominate over the Raman one with increasing temperature and decreasing field. Recent proton spin-lattice relaxation-time (T_1_) measurements on the ferrimagnetic chain compound NiCu(C_7_H_6_N_2_O_6_)(H_2_O)_3_2H_2_O suggest that the major contribution to 1/T_1_ be made by the three-magnon scattering.
description: 8 pages, 5 figures