cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
fastai: A Layered API for Deep Learning
Creators: name: Howard, Jeremy
name: Gugger, Sylvain
Publisher: name: arXiv
Year: 2020
Subjects: subject: Machine Learning (cs.LG)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Neural and Evolutionary Computing (cs.NE)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: fastai is a deep learning library which provides practitioners with high-level components that can quickly and easily provide state-of-the-art results in standard deep learning domains, and provides researchers with low-level components that can be mixed and matched to build new approaches. It aims to do both things without substantial compromises in ease of use, flexibility, or performance. This is possible thanks to a carefully layered architecture, which expresses common underlying patterns of many deep learning and data processing techniques in terms of decoupled abstractions. These abstractions can be expressed concisely and clearly by leveraging the dynamism of the underlying Python language and the flexibility of the PyTorch library. fastai includes: a new type dispatch system for Python along with a semantic type hierarchy for tensors; a GPU-optimized computer vision library which can be extended in pure Python; an optimizer which refactors out the common functionality of modern optimizers into two basic pieces, allowing optimization algorithms to be implemented in 4-5 lines of code; a novel 2-way callback system that can access any part of the data, model, or optimizer and change it at any point during training; a new data block API; and much more. We have used this library to successfully create a complete deep learning course, which we were able to write more quickly than using previous approaches, and the code was more clear. The library is already in wide use in research, industry, and teaching. NB: This paper covers fastai v2, which is currently in pre-release at http://dev.fast.ai/
Causal properties of AdS-isometry groups I: Causal actions and limit sets
Creators: name: Barbot, Thierry
Publisher: name: arXiv
Year: 2005
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 53C50, 57M50, 57S30

description: We study the causality relation in the 3-dimensional anti-de Sitter space AdS and its conformal boundary Ein. To any closed achronal subset $Λ$ in ${Ein}\_2$ we associate the invisible domain $E(Λ)$ from $Λ$ in AdS. We show that if $Γ$ is a torsion-free discrete group of isometries of AdS preserving $Λ$ and is non-elementary (for example, not abelian) then the action of $Γ$ on $E(Λ)$ is free, properly discontinuous and strongly causal. If $Λ$ is a topological circle then the quotient space $M\_Λ(Γ) = Γ\backslash{E}(Λ)$ is a maximal globally hyperbolic AdS-spacetime admitting a Cauchy surface $S$ such that the induced metric on $S$ is complete. In a forthcoming paper we study the case where $Γ$ is elementary and use the results of the present paper to define a large family of AdS-spacetimes including all the previously known examples of BTZ multi-black holes.
DOES FEAR (VIX INDEX) INCITE VOLATILITY IN FOOD PRICES?
Creators: name: Çınar, Gökhan
name: Uzmay, Ayse
name: Çınar, Gökhan
name: Uzmay, Ayse
Publisher: name: Unknown
Year: 2017
Subjects: subject: Agricultural and Food Policy
subject: Agricultural Finance
subject: Crop Production/Industries
subject: Demand and Price Analysis
subject: Financial Economics
subject: food prices
subject: fear (VIX) index
subject: BEKK GARCH model

description: Globally, the volatility trend in food prices has continued to increase. Different data give the impression that this volatility may be caused by the international finance markets’ propagation effect. For this reason, the study focused on the VIX (fear) index that is used to measure the movement in Standard & Poor’s 500 index. The main objective of the study is to analyze the degree of volatility between the VIX index and the wheat market. The research is comprised of monthly data obtained from year 2000 to 2015. The study employs the BEKK GARCH method. The findings show that the variance shocks in the fear index damage food prices. The results may be useful to policy makers in researching the causes of changes in the prices of food commodity and taking necessary measures.
The Beaty Garden : changing our campus, one meal at a time : a proposal to UBC Food Services
Creators: name: Suen, Vienna
name: Wibisono, Ratna
name: Shing, Kit
name: Yiew, Lim
name: Tsao, Charlie
name: Qazi, Hera
name: Ye, Qing
Publisher: name: The University of British Columbia
Year: 2014

description: The University of British Columbia Food System Project (UBCFSP) is an ongoing, community-based action research (CBAR) project involving multiple partners and collaborators. The overall objective of the project is to assess and improve the sustainability of the UBC Food System. The main focus of Scenario six was the development of a business proposal for a sustainable food outlet set to open in the new Beaty Biodiversity Centre for the UBC Food Services (UBCFS). The new food outlet was given the name “The Beaty Garden” with the slogan, “We know our food”. For the menu plan, we raised the possibility of “Zero Mile Mondays” featuring fresh produce from the UBC Farm. And, as part of our promotional campaign, we have made a poster called the “8 Reasons to eat local”. As well, we have developed a stamp-card scheme where each stamp translates to a 25 cent saving for each meal and a collection of 10 stamps translate to a free bake good. As part of the waste management initiative, we recommended the extension of the green discount for those who bring their own containers. However, further assessments may be necessary on the waste management program on campus. For serving wares, we recommended the usage of biodegradable materials made from potato, corn and sugar cane waste. To address interior design, we suggested the usage of bi-ceramic metal halide lamp. From our focus groups, the participants were attracted to the appeal of a sustainable food outlet but were less willing to pay for higher priced lunch meals. Finally, we recommended to the teaching team that this scenario be narrowed down in scope to stimulate specialization of specific tasks. Disclaimer: “UBC SEEDS provides students with the opportunity to share the findings of their studies, as well as their opinions, conclusions and recommendations with the UBC community. The reader should bear in mind that this is a student project/report and is not an official document of UBC. Furthermore readers should bear in mind that these reports may not reflect the current status of activities at UBC. We urge you to contact the research persons mentioned in a report or the SEEDS Coordinator about the current status of the subject matter of a project/report.”
Stable chaos and delayed onset of statisticality in unimolecular dissociation reactions
Creators: name: Karmakar, Sourav
name: Yadav, Pankaj Kumar
name: Keshavamurthy, Srihari
Publisher: name: arXiv
Year: 2020
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: Statistical models provide a powerful and useful class of approximations for calculating reaction rates by bypassing the need for detailed, and often difficult, dynamical considerations. Such approaches invariably invoke specific assumptions about the extent of intramolecular vibrational energy flow in the system. However, the nature of the transition to the statistical regime as a function of the molecular parameters is far from being completely understood. Here, we use tools from nonlinear dynamics to study the transition to statisticality in a model unimolecular reaction by explicitly visulaizing the high dimensional classical phase space. We identify generic features in the phase space involving the intersection of two or more independent anharmonic resonances and show that the presence of correlated, but chaotic, intramolecular dynamics near such junctions leads to nonstatisticality. Interestingly, akin to the stability of asteroids in the Solar System, molecules can stay protected from dissociation at the junctions for several picoseconds due to the phenomenon of stable chaos.
description: 12 pages, 6 figures (reduced size); Supplementary material can be accessed from the Journal site
PHARMACOGNOSTIC ANALYSIS OF CONVOLVOLUS ARVENSIS LINN AND ITS EVALUATION OF VARIOUS SOLVENT EXTRACTS FOR ANTIFUNGAL AND ANTIDIABETIC ACTIVITY
Creators: name: MUHAMMAD ASIF SHAHZAD
name: HAROON KHAN
name: ESHWA DAR
name: MUHAMMAD AZAM TAHIR
name: RASHID KHAN
name: SYED WAQAS ALI SHAH
name: ABDUL RAHID SHAIKH
name: ROMILA AFZAL
Publisher: name: Zenodo
Year: 2024

description: Abstract

The traditional plants found throughout the world contain many medicinally important constituents but these need to be investigated for their phytochemistry, biological and pharmacological activities. In Pakistan many plants are found which are believed to be medicinally important. In the current study, Convolvolus arvensis Linn whole plant was investigated for their pharmacognostic analysis and biological activities. Quantitative pharmacognostic analysis showed that the extract contains total ash value of 10.4% and moisture content 1.04%. Organoleptic characteristics, macroscopic and anatomical studies were performed. The antifungal activity was evaluated employing five fungal pores and the result revealed that this plant has strongest antifungal activity against Candida albicans and lowest against Aspergillus fumigatus. The highest percentage inhibition of α-amylase for Convolvulus arvensis Linn was shown by the ethanolic extract i.e. 35.43% which shows that the plant is antidiabetic. The current study suggests that the plant has different phytochemical and biological activities but selection of solvent system is the key to explore comprehensive biological actions of plants and isolation of commercially potential compounds.
HOUSEHOLDS DEMAND FOR STAPLE CEREAL COMMODITIES AND ANALYSIS OF THE EVOLUTION OF STAPLE CEREALS' PRICES IN BURKINA FASO
Creators: name: Traore, Togo M.
name: Fields III, Deacue
name: Traore, Togo M.
name: Fields III, Deacue
Publisher: name: Unknown
Year: 2017
Subjects: subject: Agricultural and Food Policy
subject: Community/Rural/Urban Development
subject: Crop Production/Industries
subject: Demand and Price Analysis
subject: Food Consumption/Nutrition/Food Safety
subject: Food Security and Poverty
subject: food consumption patterns
subject: AIDS model
subject: staple cereals
subject: Burkina Faso

description: With a population increasing rapidly and agricultural yields almost stagnant over the years, access to food is a major challenge in Burkina Faso. This study investigates households demand for staple cereal commodities in Burkina Faso, using data from the 2009-2010 Integrated Household Living Condition Survey. A complete almost ideal demand system (AIDS) model is estimated taking into account demographics and zero consumption. Results show that maize, millet and sorghum are necessities while rice is considered a superior cereal commodity. Demand for maize, millet and sorghum are less price elastic than rice and these results are consistent for most households except for wealthy, educated households living in urban areas where rice becomes a necessity. The analysis of the evolution of cereal prices shows an overall increase leaving many people in food insecurity and the country in political instability. Therefore, the country must adopt agricultural reforms to boost production and productivity by exploiting unfarmed land, building more storage facilities, roads and rural infrastructure, using improved seeds and more fertilizer, and installing irrigation systems.
Discovery of a retrogradely rotating neutron star in the X-ray pulsar GX 301$-$2
Creators: name: Mönkkönen, Juhani
name: Doroshenko, Victor
name: Tsygankov, Sergey S.
name: Nabizadeh, Armin
name: Abolmasov, Pavel
name: Poutanen, Juri
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We report on the analysis of the spin evolution of a slow X-ray pulsar GX 301$-$2 along the orbit using long-term monitoring by Fermi/GBM. Based on the observationally confirmed accretion scenario and an analytical model for the accretion of angular momentum we demonstrate that in this system, the neutron star spins retrogradely, that is, in a direction opposite to the orbital motion. This first-of-a-kind discovery of such a system proves the principal possibility of retrograde rotation in accreting systems with suitable accretion torque, and might have profound consequences for our understanding of the spin evolution of X-ray pulsars, estimates of their initial spin periods, and the ultimate result of their evolution.
description: 5 pages, 2 figures, accepted by MNRAS
PRODUCTION CONTRACT PERFORMANCE IN TOMATO PROCESSING INDUSTRY: ANALYSIS OF ALGERIAN CASE
Creators: name: Benmehaia, Amine Mohamed
name: Brabez, Fatima
name: Benharrath, Oualid
name: Benmehaia, Amine Mohamed
name: Brabez, Fatima
name: Benharrath, Oualid
Publisher: name: Unknown
Year: 2017
Subjects: subject: Agribusiness
subject: Agricultural and Food Policy
subject: Industrial Organization
subject: Production Economics
subject: vertical contract
subject: performance
subject: coordination
subject: tomato sector
subject: Algeria

description: This paper analyses empirically the processing tomato market and contracting practice in Algeria. We use extensive data on production outcomes for processing tomato growers (including 3758 coordinated grower-processor contracts) to examine the performance of grower-processor contracts. The aim of this study is to characterize the empirical relevance and regularities in tomato processor-grower provision contract. Results indicate that technology differences and regional specificity affect significantly the contract performance (fulfillment) of tomato processor-grower contract. Some policy implications are derived from this study in order to highlight the main considerations to be taken into account by the involved regulatory office.
LONG RUN DETERMINANTS OF CEREAL PRODUCTION IN ETHIOPIA: DOES CO2 EMISSION MATTER?
Creators: name: Wassie, Solomon Bizuayehu
name: Wassie, Solomon Bizuayehu
Publisher: name: Unknown
Year: 2017
Subjects: subject: Community/Rural/Urban Development
subject: Crop Production/Industries
subject: Environmental Economics and Policy
subject: Production Economics
subject: cereal crops
subject: CO2 emission
subject: climate change
subject: Ethiopia
subject: vector error correction model

description: The study employed vector error correction model to examine the long run relationship between climate change and cereal production using time series data (1962-2014) in Ethiopia. The cointegrating equation shows that the parameters included in the model are jointly significant at 1% significant level. The study revealed that a 10% percent increase in CO2 emission would have 2.75 % cereal production loss in the country. However, land and fertilizer were found to have positive and significant long-term impact on cereal production in the country. The forecasted cereal production - using contingent equation – shows that cereal production is expected to grow annually by 2.8%, on average, for the next 10 years. As a concluding remark, efforts towards reducing CO2 should be strengthened to further enhance the cereal production growth in the country. Moreover, providing fertilizer for the farmers with a reasonable price on due time is decisive to benefit from intensive agriculture.
Parasoldanellonyx baicalensis Sokolov 1952
Creators: name: Chatterjee, Tapas
name: Durucan, Furkan
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Trombidiformes
Halacaridae
Parasoldanellonyx
Parasoldanellonyx baicalensis

description: Parasoldanellonyx baicalensis Sokolov, 1952
  Record from more than 900 m a.s.l. altitudes: Mongolia —  Lake Khubsugul, about 1645* m a.s.l. in sandy bottom at 10 to 133 m depth (Jankovskaya 1973, 1976).
 Remarks: This species was recorded from fresh water lake in Lake Baikal, Russia and Lake Khubsugul (Mongolia).
description: Published as part of Chatterjee, Tapas & Durucan, Furkan, 2021, A checklist of halacarid mites (Acari, Halacaridae) found from more than 900 m a. s. l. altitudes, pp. 29-40 in Persian Journal of Acarology 10 (1) on page 32, DOI: 10.22073/pja.v10i1.63954, http://zenodo.org/record/4644616
Additional file 1 of Does winter cold really limit the dengue vector Aedes aegypti in Europe?
Creators: name: Kramer, Isabelle M.
name: Kreß, Aljoscha
name: Klingelhöfer, Doris
name: Scherer, Christian
name: Parbati Phuyal
name: Kuch, Ulrich
name: Ahrens, Bodo
name: Groneberg, David A.
name: Meghnath Dhimal
name: Müller, Ruth
Publisher: name: figshare
Year: 2020
Subjects: subject: Medicine
subject: Cell Biology
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Ecology
subject: FOS: Biological sciences
subject: 69999 Biological Sciences not elsewhere classified

description: Additional file 1. PRISMA checklist.
On the nature of long-range contributions to pair interactions between charged colloids in two dimensions
Creators: name: Lobaskin, Vladimir
name: Brunner, Matthias
name: Bechinger, Clemens
name: von Gruenberg, Hans Hennig
Publisher: name: arXiv
Year: 2003
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We perform a detailed analysis of solutions of the inverse problem applied to experimentally measured two-dimensional radial distribution functions for highly charged latex dispersions. The experiments are carried out at high colloidal densities and under low-salt conditions. At the highest studied densities, the extracted effective pair potentials contain long-range attractive part. At the same time, we find that for the best distribution functions available the range of stability of the solutions is limited by the nearest neighbour distance between the colloidal particles. Moreover, the measured pair distribution functions can be explained by purely repulsive pair potentials contained in the stable part of the solution.
description: 6 pages, 5 figures
FACTORS AFFECTING RISK MANAGEMENT STRATEGIES TO CLIMATE CHANGE EFFECTS IN GHANA
Creators: name: Ellis, Emmanuella
name: Ellis, Emmanuella
Publisher: name: Unknown
Year: 2017
Subjects: subject: Agribusiness
subject: Community/Rural/Urban Development
subject: Consumer/Household Economics
subject: Farm Management
subject: Production Economics
subject: coping strategy
subject: determinants
subject: multinomial logit
subject: risks
subject: smallholder farmers

description: The continued dependence on rain fed production by farmers increases their vulnerability to risk. In view of this, the study assessed the major risk faced by farmers, the main coping strategies adopted and the determinants of the strategies employed by farmers. Cross sectional data was obtained from 208 farmers randomly selected from the Eastern region of Ghana using a structured questionnaire in the year 2014. The Multinomial Logit regression model was employed to examine the factors influencing the coping strategies adopted by farmers. To cope with risks, farmers mainly preferred to practice crop diversification, borrow money or use up their savings. Results showed that the choice of coping strategies used by the respondents were influenced by their individual and farm characteristics, and the available institutions and capital resources. The study recommends the formulation of policies aimed at increasing farm and off farm income, and promote savings to strengthen farmers’ capacity to cope with risks.
DIE HAALBAARHEID VAN RISIKO KWANTIFISERING IN BELEIDSONTWIKKELING EN -TOEPASSING
Creators: name: Blignaut, C. S.
name: Blignaut, C. S.
Publisher: name: Unknown
Year: 1991
Subjects: Agricultural and Food Policy
Risk and Uncertainty

description: Policy development and implementation is a dynamic process. Via generic administrative functions and according to specific normative processes it must ascertain that the policy, which must include the policy goals, is acceptable and manageable. Identifiable but not easily quantifiable risks emerge from these concepts, norms and administrative functions. A dominant risk factor is the capabilities of senior civil servants responsible for policy advise to the minister and policy implementation. It is suggested that the analytical hierarchy process can be used to quantify risks in large systems.
EXCHANGE RATE DEPRECIATION AND COSTS OF AGRICULTURAL INPUTS IN SOUTH AFRICA
Wisselkoersdepresiasie en koste van landbou-insette in Suid-Afrika
Creators: name: Liebenberg, G. F.
name: Vivier, F. L.
name: Groenewald, J. A.
name: Liebenberg, G. F.
name: Vivier, F. L.
name: Groenewald, J. A.
Publisher: name: Unknown
Year: 1991
Subjects: Agricultural and Food Policy
International Relations/Trade

description: Exchange rate depreciation was isolated from other economic influences to measure its impact on retail prices of groups of agricultural inputs in South Africa. The period selected was one of generally declining exchange rate of the Rand. Serial correlation problems were overcome by a combination of the Hildreth-Lu procedure and weighted first differences. Tractor prices reacted within the same quarter, as well as the following two quarters. Prices of other input groups reacted between the first and third quarter following depreciation, with elasticities varying between -0,090 and -0,698. Some effects were of an indirect nature. Statutory administrated prices do not seem to react differently to exchange rate depreciation than prices formed by pure business decisions.
Additional file 5 of Variation in base composition underlies functional and evolutionary divergence in non-LTR retrotransposons
Creators: name: Ruggiero, Robert P.
name: Boissinot, Stéphane
Publisher: name: figshare
Year: 2020
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Additional file 5. Number of each amino acid in L1 and L2 ORF2 in lizard, frog and fish.
Non-Abelian generalization of Born-Infeld theory inspired by non-commutative geometry
Creators: name: Serie, Emmanuel
name: Masson, Thierry
name: Kerner, Richard
Publisher: name: arXiv
Year: 2003
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present a new non-abelian generalization of the Born-Infeld Lagrangian. It is based on the observation that the basic quantity defining it is the generalized volume element, computed as the determinant of a linear combination of metric and Maxwell tensors. We propose to extend the notion of determinant to the tensor product of space-time and a matrix representation of the gauge group. We compute such a Lagrangian explicitly in the case of the SU(2) gauge group and then explore the properties of static, spherically symmetric solutions in this model. We have found a one-parameter family of finite energy solutions. In the last section, the main properties of these solutions are displayed and discussed.
description: 16 pages, 7 figures, latex; Formula (12) has been corrected. This version is the final version sent to Phys.Rev.D
Ropohalacarus pallidus Bartsch 2013
Creators: name: Chatterjee, Tapas
name: Durucan, Furkan
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Trombidiformes
Halacaridae
Ropohalacarus
Ropohalacarus pallidus

description: Ropohalacarus pallidus Bartsch, 2013
 Record from more than  900 m a.s.l. altitudes: Madagaskar —  Central Madagascar, Antananarivo, Anjazorobe, River Ranonisoanavola (larger stream east from main mountain chain), 1200 m a.s.l. (Bartsch 2018); South-eastern Madagascar, Fianarantsoa, Andrambovato, stream 3 km east from the village, upstream from the cascade, 900 m a.s.l. (Bartsch 2018).
 Remarks: This species reported from Madagaskar in 200 m to 1200 m a.s.l. regions (Bartsch 2013, 2018).
description: Published as part of Chatterjee, Tapas & Durucan, Furkan, 2021, A checklist of halacarid mites (Acari, Halacaridae) found from more than 900 m a. s. l. altitudes, pp. 29-40 in Persian Journal of Acarology 10 (1) on page 34, DOI: 10.22073/pja.v10i1.63954, http://zenodo.org/record/4644616
Multi-stage evolution of heavy quarks in the quark-gluon plasma
Creators: name: Vujanovic, G.
name: Angerami, A.
name: Bass, S. A.
name: Cao, S.
name: Chen, Y.
name: Coleman, J.
name: Cunqueiro, L.
name: Dai, T.
name: Du, L.
name: Ehlers, R.
name: Elfner, H.
name: Everett, D.
name: Fan, W.
name: Fries, R.
name: Gale, C.
name: He, Y.
name: Heffernan, M.
name: Heinz, U.
name: Jacak, B. V.
name: Jacobs, P. M.
name: Jeon, S.
name: Kauder, K.
name: Ke, W.
name: Khalaj, E.
name: Kordell, M.
name: Kumar, A.
name: Luo, T.
name: Luzum, M.
name: Majumder, A.
name: McNelis, M.
name: Mulligan, J.
name: Nattrass, C.
name: Oliinychenko, D.
name: Pablos, D.
name: Pang, L. G.
name: Park, C.
name: Paquet, J. -F.
name: Putschke, J. H.
name: Roland, G.
name: Schenke, B.
name: Schwiebert, L.
name: Shen, C.
name: Silva, A.
name: Sirimanna, C.
name: Soltz, R. A.
name: Tachibana, Y.
name: Wang, X. -N.
name: Wolpert, R. L.
name: Xu, Y.
name: Yang, Z.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The interaction of heavy flavor with the quark-gluon plasma (QGP) in relativistic heavy-ion collisions is studied using JETSCAPE, a publicly available software package containing a framework for Monte Carlo event generators. Multi-stage (and multi-model) evolution of heavy quarks within JETSCAPE provides a cohesive description of heavy flavor quenching inside the QGP. As the parton shower develops, a model becomes active as soon as its kinematic region of validity is reached. Two combinations of heavy-flavor energy-loss models are explored within a realistic QGP medium, using parameters which were tuned to describe {\it light-flavor} partonic energy-loss.
description: 4 pages, 2 figures, contribution to the Quark Matter 2019 proceedings
Supersymmetry approach to nuclear-spin-polarization-induced quantum dot structure calculations
Creators: name: Samsonov, B. F.
name: Pershin, Yu. V.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In nuclear-spin-polarization-induced quantum dots the electrons are confined through local nuclear spin polarization. The model electron confinement potential is time-dependent due to the nuclear spin diffusion and relaxation processes. It can be well-approximated by a Gaussian curve which is not an exactly solvable potential. We demonstrate that it can also be approximated by multisoliton potentials for the zero value of the angular momentum and by their singular analogues for other values of momentum without any loss of calculational accuracy. We obtain these potentials by supersymmetric (or equivalently Darboux) transformations from the zero potential. The main advantage of such potentials is that they are exactly solvable. Time-dependence of the nuclear-spin-polarization-induced quantum dot energy levels is found.
description: Physica E (in press) (2005)
Developing a sustainable food outlet for UBC Food Services in the new Beaty Biodiversity Centre
Creators: name: Leung, Angela
name: Molavi, Anna
name: Fairey, Elise
name: Kong, Gary
name: Cheng, Jian Hui
name: Ho, Matthew
Publisher: name: The University of British Columbia
Year: 2014

description: The Beaty Biodiversity Centre, currently under construction on UBC's Main Mall, will be the future site of both the Biodiversity Centre and the Beaty Biodiversity Museum. A new sustainable UBC Food Service outlet is also slated for development within the museum. Expected to be the first of its kind as well as a possible model for other food outlets on the UBC campus, we were tasked with the opportunity to propose 'green' options for the outlet in terms of interior design, energy usage, waste management and menu options, amongst other things. We also showcase the future food outlet's role in the broader scope of the national and global food system. Extensive primary and secondary researched methods were employed, including literature reviews, personal communications with various stakeholders and review of other sustainable food outlets, in order for us to reach our conclusions. Recommendations to the various stakeholders and future AGSC 450 classes were also given. Disclaimer: “UBC SEEDS provides students with the opportunity to share the findings of their studies, as well as their opinions, conclusions and recommendations with the UBC community. The reader should bear in mind that this is a student project/report and is not an official document of UBC. Furthermore readers should bear in mind that these reports may not reflect the current status of activities at UBC. We urge you to contact the research persons mentioned in a report or the SEEDS Coordinator about the current status of the subject matter of a project/report.”
DIE METING VAN PERSONEELBESTUUR IN 'N BOERDERY-ONDERNEMING
Measurement of staff management in a farm firm
Creators: name: Oosthuizen, L. K.
name: Radley, A. J.
name: Oosthuizen, L. K.
name: Radley, A. J.
Publisher: name: Unknown
Year: 1991
Subjects: Farm Management
Production Economics

description: The purpose of the article is firstly to evaluate the feasibility and applicability of a Likert type staff management audit technique in a farm firm; secondly to measure the farm workers' perceptions of staff management, and thirdly to compare the worker's perceptions with the manager's predictions thereof. The case study method was used to collect the data from 33 workers and the manager by means of the staff management audit technique. With the guidance of an instructor, the workers used a block and peg apparatus to register their perceptions in respect of 37 staff management factors. The staff management audit technique is a practical and reliable instrument for registering unskilled workers' perceptions of staff management. • The workers generally experience a benevolent authoritative staff management system. A situational management approach should be applied to change the job attitudes of the workers effectively as their perceptions of the eight basic staff management characteristics differ to a reasonable extent. The staff management system can be improved by correcting the identified counter-productive forces. The application of the staff management audit in this particular way, where the workers as well as the manager are audited, gives reliable and meaningful results.
Additional file 4 of Variation in base composition underlies functional and evolutionary divergence in non-LTR retrotransposons
Creators: name: Ruggiero, Robert P.
name: Boissinot, Stéphane
Publisher: name: figshare
Year: 2020
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Additional file 4. Relationship between base composition at the 3rd position of codon and codon usage statistics.
Modular Parametrizations of Neumann-Setzer Elliptic Curves
Creators: name: Stein, William
name: Watkins, Mark
Publisher: name: arXiv
Year: 2004
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: Suppose $p$ is a prime of the form $u^2+64$ for some integer $u$, which we take to be 3 mod 4. Then there are two Neumann--Setzer elliptic curves $E_0$ and $E_1$ of prime conductor $p$, and both have Mordell--Weil group $\Z/2\Z$. There is a surjective map $X_0(p)\xrightarrowπ E_0$ that does not factor through any other elliptic curve (i.e., $π$ is optimal), where $X_0(p)$ is the modular curve of level $p$. Our main result is that the degree of $π$ is odd if and only if $u \con 3\pmod{8}$. We also prove the prime-conductor case of a conjecture of Glenn Stevens, namely that that if $E$ is an elliptic curve of prime conductor $p$ then the optimal quotient of $X_1(p)$ in the isogeny class of $E$ is the curve with minimal Faltings height. Finally we discuss some conjectures and data about modular degrees and orders of Shafarevich--Tate groups of Neumann--Setzer curves.
Towards Detection of Subjective Bias using Contextualized Word Embeddings
Creators: name: Dadu, Tanvi
name: Pant, Kartikey
name: Mamidi, Radhika
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: Subjective bias detection is critical for applications like propaganda detection, content recommendation, sentiment analysis, and bias neutralization. This bias is introduced in natural language via inflammatory words and phrases, casting doubt over facts, and presupposing the truth. In this work, we perform comprehensive experiments for detecting subjective bias using BERT-based models on the Wiki Neutrality Corpus(WNC). The dataset consists of $360k$ labeled instances, from Wikipedia edits that remove various instances of the bias. We further propose BERT-based ensembles that outperform state-of-the-art methods like $BERT_{large}$ by a margin of $5.6$ F1 score.
description: To appear in Companion Proceedings of the Web Conference 2020 (WWW '20 Companion)
A gauge invariant dressed holon and spinon description of the normal-state of underdoped cuprates
Creators: name: Feng, Shiping
name: Qin, Jihong
name: Ma, Tianxing
Publisher: name: arXiv
Year: 2003
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: A partial charge-spin separation fermion-spin theory is developed to study the normal-state properties of the underdoped cuprates. In this approach, the physical electron is decoupled as a gauge invariant dressed holon and spinon, with the dressed holon behaving like a spinful fermion, and represents the charge degree of freedom together with the phase part of the spin degree of freedom, while the dressed spinon is a hard-core boson, and representing the amplitude part of the spin degree of freedom. The electron local constraint for single occupancy is satisfied. Within this approach, the charge and spin dynamics of the underdoped cuprates are studied based on the t-t'-J model. It is shown that the charge dynamics is mainly governed by the scattering from the dressed holons due to the dressed spinon fluctuation, while the scattering from the dressed spinons due to the dressed holon fluctuation dominates the spin dynamics.
description: 10 pages, 7 figures, corrected typos
Light-Regulation of Tryptophan Synthase by Combining Protein Design and Enzymology
Creators: name: Kneuttinger, Andrea C.
name: Zwisele, Stefanie
name: Straub, Kristina
name: Bruckmann, Astrid
name: Busch, Florian
name: Kinateder, Thomas
name: Gaim, Barbara
name: Wysocki, Vicki H.
name: Merkl, Rainer
name: Sterner, Reinhard
Publisher: name: Universität Regensburg
Year: 2019
Subjects: subject: allostery; biocatalysis; enzymology; photo-control; protein design; unnatural amino acids
subject: 570 Biowissenschaften, Biologie

description: The spatiotemporal control of enzymes by light is of growing importance for industrial biocatalysis. Within this context, the photo-control of allosteric interactions in enzyme complexes, common to practically all metabolic pathways, is particularly relevant. A prominent example of a metabolic complex with a high application potential is tryptophan synthase from Salmonella typhimurium (TS), in which the constituting TrpA and TrpB subunits mutually stimulate each other via a sophisticated allosteric network. To control TS allostery with light, we incorporated the unnatural amino acid o-nitrobenzyl-O-tyrosine (ONBY) at seven strategic positions of TrpA and TrpB. Initial screening experiments showed that ONBY in position 58 of TrpA (aL58ONBY) inhibits TS activity most effectively. Upon UV irradiation, ONBY decages to tyrosine, largely restoring the capacity of TS. Biochemical characterization, extensive steady-state enzyme kinetics, and titration studies uncovered the impact of aL58ONBY on the activities of TrpA and TrpB and identified reaction conditions under which the influence of ONBY decaging on allostery reaches its full potential. By applying those optimal conditions, we succeeded to directly light-activate TS(aL58ONBY) by a factor of ~100. Our findings show that rational protein design with a photo-sensitive unnatural amino acid combined with extensive enzymology is a powerful tool to fine-tune allosteric light-activation of a central metabolic enzyme complex.
Soldanellonyx visurgis Viets 1959
Creators: name: Chatterjee, Tapas
name: Durucan, Furkan
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Trombidiformes
Halacaridae
Soldanellonyx
Soldanellonyx visurgis

description: Soldanellonyx visurgis Viets, 1959
 Record from more than  900 m a.s.l. altitudes: Vietnam —  Ha Giang, Quan Ba, Tam Son, Grotta passante, 980 m a.s.l. (Bartsch 2014).
 Remarks: This species is an inhabitant of subterranean water, living amongst sand in caves, wells, banks and hyporheic zones of rivers, also few rare records are from surface substrata (Bartsch 2014).
description: Published as part of Chatterjee, Tapas & Durucan, Furkan, 2021, A checklist of halacarid mites (Acari, Halacaridae) found from more than 900 m a. s. l. altitudes, pp. 29-40 in Persian Journal of Acarology 10 (1) on page 35, DOI: 10.22073/pja.v10i1.63954, http://zenodo.org/record/4644616
title: Analysing Resilience: Disaster Response and Recovery in the Solomon Islands
Creators: name: Hagen, Kimberley
Publisher: name: The Open University
Year: 2015

description: In April 2007 an earthquake with a magnitude of 8.1 occurred in the Solomon Islands. Within minutes tsunami waves hit several islands, causing death and destruction. This thesis examines how four ethnically diverse communities on Ghizo Island responded to and recovered from these disastrous events. Referred to as processes of disaster management, response and recovery are analysed with the aim of providing insight into community resilience to the 2007 disasters and into changes in the communities' indicators of disaster resilience in the aftermath of the events. By doing so, this thesis addresses the following research question: 'In the aftermath of the 2007 Solomon Islands earthquake and tsunamis, how have disaster management processes informed community resilience?' This thesis makes three main claims. First, when looking at the reaction and coping mechanisms of the affected communities, the Melanesian inhabitants of Ghizo were more resilient than the Gilbertese communities who migrated to the Solomon Islands in the mid-20th century. The relative strength of the diversity of their culturally-embedded livelihood activities played a prominent role in this. Second, it shows that although humanitarian aid should be largely concerned with a timely and efficient delivery of emergency items, the local context should play a prominent role in the design and execution of aid interventions aimed at recovery. Failing to do so may negatively impact affected communities' socio-cultural long-term recovery. This introduces the third claim: affected communities' indicators of resilience change in a post-disaster setting. Actively initiated changes in cultural practices with the aim of increasing resilience are part of this, as well as the long-term decline in intra-community cohesion related to conflict over aid. This thesis demonstrates how research in the aftermath of disasters can provide valuable information on resilience and cultural change, related to both the physical event and subsequent aid interventions.
FAKTORE WAT DIE VERGOEDING VAN PLAASBESTUURDERS BEINVLOED
Factors that influence the remuneration of farm managers
Creators: name: Laubscher, J.
name: Kassier, W. E.
name: Conradie, W. J.
name: Laubscher, J.
name: Kassier, W. E.
name: Conradie, W. J.
Publisher: name: Unknown
Year: 1991
Subjects: Farm Management
Production Economics

description: The yearly remuneration of farm managers is a factor of mainly experience of occupation and responsibility, as measured by the value of the assets a manager has to deal with in his managerial task. No direct relationship exists be post-matric education and remuneration. However, post-matric education seems to be good future investment due to the finding that positions with the greater responsibility are filled significantly by more managers in possession of a matric qualification.
Additional file 3 of Variation in base composition underlies functional and evolutionary divergence in non-LTR retrotransposons
Creators: name: Ruggiero, Robert P.
name: Boissinot, Stéphane
Publisher: name: figshare
Year: 2020
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Additional file 3. Codon usage in ORF2 for four amino acids in fish and lizard L1 and L2.
RESEARCH NOTE: DEMAND ANALYSIS OF EGGS IN SOUTH AFRICA
Vraaganalise van eiers in Suid-Afrika
Creators: name: Cleasby, R. C. G.
name: Ortmann, G. F.
name: Cleasby, R. C. G.
name: Ortmann, G. F.
Publisher: name: Unknown
Year: 1991
Subjects: Demand and Price Analysis
Livestock Production/Industries

description: This research note summarizes empirical estimates of price and income elasticities of demand for eggs in South Africa. Multicollinearity and autocorrelation posed problems for the analysis. The price elasticity for eggs was estimated as -0,55 and the income elasticity as 0,41.
Barbutia Oudemans. This 1927
Creators: name: Mohammad-Doustaresharaf, Mojtaba
name: Bagheri, Mohammad
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Trombidiformes
Barbutiidae
Barbutia

description: Genus Barbutia Oudemans, 1927
 Type species: Stigmaeus (Macrostigmaeus) anguineus Berlese, 1910: 208.
description: Published as part of Mohammad-Doustaresharaf, Mojtaba & Bagheri, Mohammad, 2021, Description of Barbutia arasbaraniensis sp. nov. (Acari: Trombidiformes: Barbutiidae) based on the deutonymph and male specimens from Iran, pp. 9-17 in Persian Journal of Acarology 10 (1) on page 10, DOI: 10.22073/pja.v10i1.64012, http://zenodo.org/record/4644638
Relationships between Photospheric Vertical Electric Currents and Hard X-Ray Sources in Solar Flares: Statistical Study
Creators: name: Zimovets, I. V.
name: Sharykin, I. N.
name: Gan, W. Q.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: There are still debates whether particle acceleration in solar flares may occur due to interruption of electric currents flowing along magnetic loops. To contribute to this problem, we performed the first statistical study of relationships between flare hard X-ray (HXR; $50-100$ keV) sources observed by the \textit{Ramaty High-Energy Solar Spectroscopic Imager} (RHESSI) and photospheric vertical electric currents (PVECs, $j_{r}$) calculated using vector magnetograms obtained with the Helioseismic and Magnetic Imager (HMI) on-board the \textit{Solar Dynamics Observatory} (SDO). A sample of 48 flares, from C3.0 to X3.1 class, observed in central part of the solar disk by both instruments in 2010--2015 was analyzed. We found that $\approx 70$\% of all HXR sources overlapped with islands or ribbons of enhanced ($\left| j_{r} \right| \gtrsim 10^{4}$ statampere~cm$^{-2}$) PVECs. However, less than $\approx 40$\% of the HXR sources overlapped with PVEC maxima, with an accuracy of $\pm 3^{\prime\prime}$. More than in half of the flares there were HXR sources outside regions of enhanced PVECs. We found no correlation between intensity of the HXR sources and PVEC density or total PVEC under them. No systematic dissipation of PVECs under the HXR sources was found during the flares. Collectively, the results do not support the current-interruption flare models. However, the results indicate the importance of the presence of longitudinal currents in flare regions. Understanding of their specific role in the processes of energy release, plasma heating, and acceleration of particles requires further investigation.
description: 56 pages, 21 figures, accepted in ApJ
RESEARCH NOTE: AN ANALYSIS OF THE SUPPLY OF MAIZE IN SOUTH AFRICA
'n Ontleding van die aanbod van mielies in Suid-Afrika
Creators: name: Van Zyl, Johan
name: Van Zyl, Johan
Publisher: name: Unknown
Year: 1991
Subjects: Crop Production/Industries
Food Consumption/Nutrition/Food Safety

description: Regression analysis was used to determine the supply of maize in the major production areas of South Africa. The results show that prices of maize and its production substitutes do not play a major role in determining the annual area under maize. Other factors thus play an important role in the determination of crop varieties, what and how much to plant. These analyses largely confirm the results obtained by other researchers.
Additional file 2 of Variation in base composition underlies functional and evolutionary divergence in non-LTR retrotransposons
Creators: name: Ruggiero, Robert P.
name: Boissinot, Stéphane
Publisher: name: figshare
Year: 2020
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Additional file 2. Phylogenetic relationships among Rex1 elements based on the entire ORF2.
Parametric Lyapunov exponents
Creators: name: De Thélin, Henry
name: Gauthier, Thomas
name: Vigny, Gabriel
Publisher: name: arXiv
Year: 2020
Subjects: subject: Dynamical Systems (math.DS)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 28D20, 37F45, 37F10

description: In an algebraic family of rational maps of $\mathbb{P}^1$, we show that, for almost every parameter for the trace of the bifurcation current of a marked critical value, the critical value is Collet-Eckmann. This extends previous results of Graczyk and Świcatek in the unicritical family, using Makarov theorem. Our methods are based instead on ideas of laminar currents theory.
Controlling Rayleigh-Bénard convection via Reinforcement Learning
Creators: name: Beintema, Gerben
name: Corbetta, Alessandro
name: Biferale, Luca
name: Toschi, Federico
Publisher: name: arXiv
Year: 2020
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Machine Learning (cs.LG)
subject: Systems and Control (eess.SY)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Thermal convection is ubiquitous in nature as well as in many industrial applications. The identification of effective control strategies to, e.g., suppress or enhance the convective heat exchange under fixed external thermal gradients is an outstanding fundamental and technological issue. In this work, we explore a novel approach, based on a state-of-the-art Reinforcement Learning (RL) algorithm, which is capable of significantly reducing the heat transport in a two-dimensional Rayleigh-Bénard system by applying small temperature fluctuations to the lower boundary of the system. By using numerical simulations, we show that our RL-based control is able to stabilize the conductive regime and bring the onset of convection up to a Rayleigh number $Ra_c \approx 3 \cdot 10^4$, whereas in the uncontrolled case it holds $Ra_{c}=1708$. Additionally, for $Ra > 3 \cdot 10^4$, our approach outperforms other state-of-the-art control algorithms reducing the heat flux by a factor of about $2.5$. In the last part of the manuscript, we address theoretical limits connected to controlling an unstable and chaotic dynamics as the one considered here. We show that controllability is hindered by observability and/or capabilities of actuating actions, which can be quantified in terms of characteristic time delays. When these delays become comparable with the Lyapunov time of the system, control becomes impossible.
description: 24 pages, 10 figures