cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
O3/O7 Orientifold Truncations and Very Special Quaternionic-Kaehler Geometry
Creators: name: Smet, Geert
name: Bergh, Joris Van den
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the orientifold truncation that arises when compactifying type II string theory on Calabi-Yau orientifolds with O3/O7-planes, in the context of supergravity. We look at the N=2 to N=1 reduction of the hypermultiplet sector of N=2 supergravity under the truncation, for the case of very special quaternionic-Kaehler target space geometry. We explicitly verify the Kaehler structure of the truncated spaces, and we study the truncated isometry algebra. For symmetric special quaternionic spaces, we give a complete overview of the spaces one finds after truncation. We also find new examples of dual Kaehler spaces, that give rise to flat potentials in N=1 supergravity.
description: 25 pages, LaTeX, v2:curvature tensor of the dual symmetric spaces calculated, section 7 expanded, references added, v3:few typos fixed, version to appear in Class.Quantum Gravity
Sustainability in the tourism sector: Assessing ecotourist’s willingness to pay for ecotourism offerings in Trinidad and Tobago
Creators: name: Joseph, Jeanelle
name: Singh-Knights, Doolarie
name: Smith, Dennis
name: Joseph, Jeanelle
name: Singh-Knights, Doolarie
name: Smith, Dennis
Publisher: name: Unknown
Year: 2010
Subjects: Environmental Economics and Policy
Production Economics

description: The tourism sector in the Caribbean has been a significant contributor towards the region‟s GDP, contributing 13.8% in 2005. Ecotourism has been identified as a low impact means to provide income generating opportunities that are complementary to nature conservation as well as the welfare of the local population. These goals are sometimes not met, however, and environmentally unfriendly or economically unsuccessful ecotourism tends to prevail in many developing countries, questioning the validity of its original concept. Therefore, careful assessment of cultural, environmental, and economic aspects is necessary when introducing ecotourism to a region. A discrete choice conjoint analysis of international and local tourist preferences for ecotourism is undertaken to analyze the decision to participate in ecotourism activities and to identify characteristics of the market segments that comprise the market for ecotourism offerings, the market attitudes towards ecotourism and the ecotourism products that could attract the market segments. Tests of market segmentation by nationality, age, and experience of traveller are conducted in a multinomial logit estimation procedure. The study also analyzes preferences of tourists to assess tourists‟ willingness to pay (WTP), and to assess the financial potential of ecotourism offerings. This study provides practical planning direction to all ecotourism stakeholders to increase tourism-generated income for rural communities, and thus contribute to the sustainable development of the region more generally.
The impact of the financialisation of policing in the United Kingdom
Creators: name: Hurley, Vincent
Publisher: name: Macquarie University
Year: 2024
Subjects: classificationCode: 399999
subject: Other education not elsewhere classified

description:   
This research project focuses on the impact of increased financialisation and austerity on police and policing in the UK. Specifically, it examines how UK police dealt with corporate hemorrhaging of 21,000 police and funding cuts of £2bn manifested through extensive and non-discriminatory divestment of resources and employees from 2010 to 2020. This resulted in an organisational trajectory where police employees felt under siege and objectified. The cascading effect was despair and loss. Inconsolability permeated the entire policing organisation to the point that police abdicated their policing responsibilities to their organisations and the community as they were consumed by melancholia. 
Following a decade of fiscal conservatism and increased administrative metrics imposed by successive UK governments, the police are a very much transformed entity. Drawing on both policy documents and  18 in-depth interviews, this research project charts the experiences, emotions and ontological challenges faced by individual police officers who, in their day-to-day role, struggle to overcome the limitations of the new policing landscape. Through the theoretical lens of Foucault and Freud, the research addresses key issues of mourning, loss and managing the increased demand of policing within a much reduced organisational structure. 
There were three key findings. First, police were forced to focus on how to manage and meet their predetermined fiscal and organisational targets over the goal of policing the community. It was the case of organisational policing first, community policing second. Second, police saw themselves as being increasingly irrelevant in their function to the point of feeling like they were a footnote in society. Third, the impact of years of government scrutiny and the relentlessness of being asked to be more effective and efficient wore the police down to the point where they felt they were participating in posthumous policing of society. In conclusion, this project presents a vision of police and policing existing in an inconsolable organisation.
Non-Common Band SAR Interferometry via Compressive Sensing
Creators: name: Yang, Huizhang
name: Chen, Chengzhi
name: Chen, Shengyao
name: Xi, Feng
name: Liu, Zhong
Publisher: name: arXiv
Year: 2020
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: To avoid decorrelation, conventional synthetic aperture radar interferometry (InSAR) requires that interferometric images should have a common spectral band and the same resolution after proper preprocessing. For a high-resolution (HR) image and a low-resolution (LR) one, the interferogram quality is limited by the LR one since the non-common band (NCB) between two images is usually discarded. In this article, we try to establish an InSAR method to improve interferogram quality by means of exploiting the NCB. To this end, we first define a new interferogram, which has the same resolution as the HR image. Then we formulate the interferometric relationship between the two images into a compressive sensing (CS) model, which contains the proposed HR interferogram. With the sparsity of interferogram in appropriate domains, we model the interferogram formation as a typical sparse recovery problem. Due to the speckle effect in coherent radar imaging, the sensing matrix of our CS model is inherently random. We theoretically prove that the sensing matrix satisfies restricted isometry property, and thus the interferogram recovery performance is guaranteed. Furthermore, we provide a fast interferogram formation algorithm by exploiting computationally efficient structures of the sensing matrix. Numerical experiments show that the proposed method provides better interferogram quality in the sense of reduced phase noise and obtain extrapolated interferogram spectra with respect to CB processing.
description: Accepted for publication IEEE Transactions on Geoscience and Remote Sensing
The potential economic impact of dwarfing tall golden apple (Spondias cytherea Sonn.) in Grenada
Creators: name: Andall, Reginald P.
name: Andall, Reginald P.
Publisher: name: Unknown
Year: 2010
Subjects: Political Economy
Production Economics

description: From the mid 1980‟s to 2004, golden apple (Spondias cytherea Sonn.) was one of the most important non-traditional fruit crops exported from Grenada. In 1995, some 617, 637 kg of the fruit was exported earning EC$1, 439,789.11. Golden apple accounted for 36% of all non-traditional fruit exports. Because the trees are very tall (up to 14 m), harvesting is difficult and, therefore, an estimated 30% of the fruits are damaged during the harvesting process. A methodology was, therefore, developed to get low growing trees which can be easily harvested from the ground level. If golden apple growers adopt this method one can expect an increase in the quantity of fruits exported and marketed locally. Farmers will have greater control over harvesting and marketing of their fruits allowing them to access more profitable marketing arrangements. On the other hand, praedial larceny of golden apple fruits may become a factor impacting farmers.
Coherent Baryogenesis and Nonthermal Leptogenesis: A comparison
Creators: name: Garbrecht, Bjorn
name: Prokopec, Tomislav
name: Schmidt, Michael G.
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present a new mechanism for baryogenesis: at preheating after inflation fermions acquire a varying mass by their coupling to a time dependent field. Their CP-violating mass matrix can generate a charge asymmetry to be transformed into a lepton asymmetry through decay into standard model particles and heavy Majorana neutrinos. In a concrete model of hybrid inflation we compare ``coherent baryogenesis'' with nonthermal leptogenesis by perturbative decay of the inflation condensates.
description: 6 pages, 2 figures, contribution to the Proceedings of Strong and Electroweak Matter 2004 (SEWM2004), Helsinki, Finland, June 16-19, 2004
Beneficial Properties of Pumpkin Seed Oil as an Antioxidant Nutraceutical
Creators: name: Bora, Nilutpal Sharma
Publisher: name: figshare
Year: 2020
Subjects: subject: 111599 Pharmacology and Pharmaceutical Sciences not elsewhere classified
subject: FOS: Clinical medicine
subject: 111504 Pharmaceutical Sciences

description: The seeds of pumpkin are highly popular as an edible delicacy in different countries of the world and possess a high antioxidant value along with anti-diabetic, anti-carcinogenic and anti-inflammatory properties. The oil from this seed is also documented to contain high phenolic content which translates to its high antioxidant capability. Pumpkin seed oil has been envisaged as a preservative and functional ingredient in many foods, cosmetics and nutraceutical.
Promoting food security through increased production and productivity of selected vegetables (under protected agriculture) and root crops
Creators: name: Wilson, M.
name: Wilson, M.
Publisher: name: Unknown
Year: 2010
Subjects: Agricultural and Food Policy
Food Consumption/Nutrition/Food Safety
Food Security and Poverty

description: Two issues form the basis of activities which characterize the CARDI initiatives within its work programme; the increasing urgency of regional food security and the emergence of issues within a background of limited resources and environmental change. In this context, increased production and productivity of vegetables under protected agriculture as well as root crops are the focus of two new projects being implemented by CARDI over the next three years. The projects are entitled as follows: • Increased Production of Root and Tuber Crops in the Caribbean through the Introduction and Dissemination of Improved Production Technologies • Increased Production of Vegetables and Herbs through the Use of Protected Agriculture in the Caribbean A holistic approach (within limitations) to the sustainable development of the industries is adopted. For this reason, the projects address key components which dictate the capacity of the region’s industries to be competitive and to efficiently service the demand for these items. These components, determined within a commodity chain mode, comprise the servicing of markets, the transfer of production technology through training, the organization of commodity based groups, and the supply of planting material. The proposed loci of operations include Haiti, Jamaica, Barbados, Trinidad & Tobago and strategically selected OECS countries, however, the entire region would be expected to benefit from the project’s expected output.
Ultraviolet Radiation Toxicity in High Altitude Areas
Creators: name: Bora, Nilutpal Sharma
Publisher: name: figshare
Year: 2020
Subjects: subject: 111599 Pharmacology and Pharmaceutical Sciences not elsewhere classified
subject: FOS: Clinical medicine
subject: 111504 Pharmaceutical Sciences

description: High altitude areas are geographically defined as those which are situated at an elevation of 8000 feet or above from sea level. With increase in elevation, it is observed that a series of adverse effects on the human body occurs. Rise in blood pressure, breathlessness and muscle fatigue are among these effects. It is also observed that the intensity of ultra violet (UV) radiation also increases and along with it increases the risks of the skin and eyes getting exposed to the radiation. The National Oceanic and Atmospheric Administration (NOAA) has mentioned that with every 1000 feet increase in altitude, the intensity of UV radiation increases by 4 - 5%. With the presence of snow, this effect increases to more than 100% as the UV radiation gets reflected by the layer of snow.
Improving local food supply chains for the tourism sector in the U.S. Virgin Islands
Creators: name: Wailes, E.
name: Crossman, S.
name: Robles, C.
name: Peterson, Louis
name: Mwaijande, F.
name: Wailes, E.
name: Crossman, S.
name: Robles, C.
name: Peterson, Louis
name: Mwaijande, F.
Publisher: name: Unknown
Year: 2010
Subjects: subject: Food Consumption/Nutrition/Food Safety
subject: Food Security and Poverty
subject: International Relations/Trade
subject: Marketing
subject: FOS: Economics and business
subject: Sustainable
subject: local
subject: food
subject: chains
subject: tourism
subject: Caribbean

description: This study identified key production, marketing and policy constraints and barriers for local food supply chains to enhance agricultural market development for agritourism in the U.S. Virgin Islands. Focus groups and questionnaires were administered to policy decision-makers, farmers, and the hospitality sector to obtain information about these barriers and constraints and to identify appropriate policy responses to improve local food supply for the tourism economy. This information was evaluated using both qualitative and quantitative research methods to determine the relative importance of the constraints and agreement among stakeholders. Key constraints included inadequate production resources (land, irrigation, and credit) and lack of quantity, quality and information of local foods to meet the demand by the tourism sector. Findings were presented and discussed at stakeholder meetings. A pilot project to integrate producers and island restaurants and resorts (Farmer-Chef Connection) was proposed and is being implemented. Legislative proposals to address production and marketing resource constraints are also being developed. Emphasis on active participation of stakeholders and the development of a policy network is viewed as critical to developing sustainable food tourism supply chain linkages.
Multifractality of correlated two-particle bound states in quasiperiodic chains
Creators: name: Thongjaomayum, Diana
name: Flach, Sergej
name: Andreanov, Alexei
Publisher: name: arXiv
Year: 2020
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We consider the quasiperiodic Aubry-André chain in the insulating regime with localised single-particle states. Adding local interaction leads to the emergence of extended correlated two-particle bound states. We analyse the nature of these states including their multifractality properties. We use a projected Green function method to compute numerically participation numbers of eigenstates and analyse their dependence on the energy and the system size. We then perform a scaling analysis. We observe multifractality of correlated extended two-particle bound states, which we confirm independently through exact diagonalisation.
description: 7 pages, 8 figures
Group 4 complexes of an arene-bridged diamidophosphine ligand for nitrogen activation
Creators: name: Maclachlan, Erin Alisa
Publisher: name: University of British Columbia
Year: 2011

description: Molecular nitrogen comprises about 80% of the earth’s atmosphere, but is only used as a starling material in one industri2l reaction: NH₃ synthesis from N₂ and H₂ by the Haber Bosch process. Dinitrogen is generally unreactive, however, N₂ complexes of most transition metals and lanthanides are known, and the challenge remains to discover metal dinitrogen complexes that can functionalize N₂. This thesis describes a new ligand, [NPN]*, its coordination to Zr and Hf, and the use of [NPN]*Zr complexes to transform N₂. Arene-bridged diamidophosphine ligand [NPN]*Li₂ ([NPN]* = [{N-(2,4,6- Me₃C₆H₂)(2-N-5-Me-C₆H₃)}₂PPh]²) is synthesized from simple organic compounds and PhPCl₂ in high yield. Zr and Hf complexes, [NPN]*MCl₂ (M = Zr, Hf), are prepared via protonolysis from [NPN]*H₂, M(NMe₂)₄, and Me₃SiCl. Organometallic [NPN]*MR₂ (R = Me, CH₂Ph, CH₂SiMe₃) are prepared from [NPN]*MC₂ and Grignard or organolithium reagents. [NPN]*ZrR₂ (R = CH₂Ph, CH₂SiMe₃) are light- and heat-sensitive, and decompose to cyclometalated [NPNC] *ZrR ([NPNC] * = [(2-MesN-5-MeC₆H₃)P(Ph)(2-(NC₆H₂-2,4- CH₃-6-CH₂)-5-MeC₆H₃)]³⁻) and RH via an intramolecular σ-bond metathesis mechanism. A Zr-N 2 complex, {[NPN]*Zr(THF)}₂(μ-η²:η²-N₂), is synthesized in high yield from [NPN]*ZrCl₂ and 2.2 equiv. of KC₈ in THF under 4 atm of N₂. By single crystal X-ray analysis, N₂ has been reduced to N₂⁴⁻ and is side-on bound to two Zr atoms. Excess Py and PMe₂R (R = Me, Ph) reacts with the Zr-N₂ complex to furnish {[NpN]*Zr(Py)}₂(μ-η²:η²- N₂), and {[NPN]*Zr(PMe₂R) } (μ-η²:η²-N₂) {Zr[NPN] * }, respectively. The PMe₂R adducts react with H₂ to provide {[NPN]*Zr(PMe₂R)} (μ-η²:η²-NNH) {Zr[NPN]*} with a new N-H bond. A new N-Si bond forms upon addition of PhSiH₃ to the Py adduct to give {[NPN]*Zr(Py)} (μ-H)(μ-η¹:η²-NNSiH₂Ph)] {Zr[NPN]}* in high yield. The reaction of 4,4’- dimethylbenzophenone with the THF adduct provides NN=C(4-MeC₆H₄)₂) with a new N=C bond, and benzophenone imine reacts with the Py adduct to generate {[NPN]*Zr(N=CPh₂)}₂(μ-η²:η²-N₂H₂) with two new N-H bonds. The dilithium complex of Ph,AR[NPN]’ (Ar=4-PrC₆H₄) is prepared in two steps from commercially available reagents. Ph,Ar[NPN’Li₂(S) (S = THF, dioxane) is similar to [NPN]*Li₂(S) in solution and in the solid state, and is converted to Ph,Ar[NPN]’ZR(NMe₂)₂ via protonolysis. Future directions for research are also suggested.
INVESTIGATION OF IN-VITRO ANTHELMINTIC ACTIVITY OF GARCINIA LANCEIFOLIA BARK IN PHERETIMA POSTHUMA (INDIAN ADULT EARTHWORM)
Creators: name: Bora, Nilutpal Sharma
name: Bibhuti Bhusan Kakoti
name: Gogoi, Barnali
Publisher: name: figshare
Year: 2020
Subjects: subject: 111599 Pharmacology and Pharmaceutical Sciences not elsewhere classified
subject: FOS: Clinical medicine
subject: 111504 Pharmaceutical Sciences

description: Garcinia lanceifolia, a lesser known species of Garcinia, is an important and endemic plant of Assam which is used by many communities of Northeast India to treat various disorders. Till date no scientific study has been carried out on this plant to establish its anthelmintic potential. Hence, an elaborate study was carried out on the anthelmintic potential of Ethyl acetate, Methanolic and Aqueous fractions of the bark of Garcinia lanceifolia Roxb. against Pheretima posthuma using Albendazole as a reference standard. Forty eight Indian Adult Earthworms were collected, divided into twelve groups containing four worms in each group. Three concentrations 25mg/mL, 50mg/mL, 100mg/mL each of standard drug Albendazole and all the three extracts were considered for this essay. This involved the recording of the time of paralysis and death of the worms. Results showed a dose dependent increase in the anthelmintic activity. Methanolic extract of Garcinia lanceifolia showed the highest activity at the dose of 100mg/mL.
Phytochemistry and Pharmacology of Phlogacanthus Thyrsiflorus Nees: A Review
Creators: name: Bora, Nilutpal Sharma
name: Gogoi, Barnali
name: Bibhuti Bhusan Kakoti
name: Ashis Kumar Goswami
Publisher: name: figshare
Year: 2020
Subjects: subject: 111599 Pharmacology and Pharmaceutical Sciences not elsewhere classified
subject: FOS: Clinical medicine
subject: 111504 Pharmaceutical Sciences

description: Phlogacanthus thyrsiflorus is a gregarious evergreen shrub which is used in several traditional medicines to cure various diseases. This plant has been known to possess antibacterial, antifungal, anti diabetic, anti-inflammatory, anti cancerous, hypolipidaemic and hepatoprotective activity. It has been also reported that different parts of the plant is use as anti-septic, insecticide and as an antiallergic. A wide range of chemical compounds including diterpene glucoside, phloganthoside, has been isolated from Phlogacanthus thyrsiflorus. Phytochemical constituents isolated from the plant are flavonoids, tannins, phytosterols, phenol, glycosides, fatty acids, galacto-glycero lipid and volatile oil etc. The presented review summarizes the information concerning the botany, ethno pharmacology query, phytochemistry, pharmacological activities of the plant.
Toxicity of Environmental UV Radiation: The Malicious Fraction of Terrestrial Solar Spectrum
Creators: name: Bora, Nilutpal Sharma
Publisher: name: figshare
Year: 2020
Subjects: subject: 111599 Pharmacology and Pharmaceutical Sciences not elsewhere classified
subject: FOS: Clinical medicine
subject: 111504 Pharmaceutical Sciences

description: The terrestrial spectrum of solar radiation consists of 1-5% of UVB (280-320nm) and 95–99% of UVA (320-400nm) radiation.Both types of UV radiation have been classified as complete carcinogen because of its ability to promote and progress tumours. It is also the most common cause for skin cancer and other skin disorders cause due to environmental factors.
Garcinia lanceifolia Roxb; An Endemic Medicinal Plant of Assam Relieves Pain and Delays Nociceptive Response: An Assay for Its Analgesic and Anti-inflammatory Activity
Creators: name: Bora, Nilutpal Sharma
name: Bibhuti Bhusan Kakoti
name: Partha Sarathi Bairy
name: Gogoi, Barnali
Publisher: name: figshare
Year: 2020
Subjects: subject: 111599 Pharmacology and Pharmaceutical Sciences not elsewhere classified
subject: FOS: Clinical medicine
subject: 111504 Pharmaceutical Sciences

description: The stem bark of Garcinia lanceifolia, a lesser known species of the genus Garcinia, was extracted with methanol after pretreatment with petroleum ether. The resultant extract was evaluated for its analgesic and anti-inflammatory potential using various models. The assays were carried out on adult male Wistar Albino rats. The analgesic activity was assayed by hot plate method and tail flick assay using Morphine sulphate as standard drug at a dose of 5 mg/kg body weight and the results were expressed as mean increase in latency after drug administration ± SEM. The anti-inflammatory activity was evaluated by Carrageenan-induced rat paw oedema model using Diclofenac sodium as standard drug at a dose of 100 mg/kg body weight. The results were expressed in terms of mean increase in paw volume ± SEM. The extract of the stem bark was given in doses of 250 mg/kg and 500 mg/kg body weight. All the doses were administered per orally. Results reveal that Garcinia lanceifolia Roxb. posseses remarkable analgesic and anti-inflammatory activities.
Retail margins, price transmission and price asymmetry in selected agricultural commodities in Trinidad and Tobago: Investigating the causes of presentation: Increasing food prices
Creators: name: Patterson, A.
name: Singh-Knights, D.
name: Knights, Marlon
name: Patterson, A.
name: Singh-Knights, D.
name: Knights, Marlon
Publisher: name: Unknown
Year: 2010
Subjects: subject: Marketing
subject: FOS: Economics and business
subject: Production Economics
subject: Productivity Analysis
subject: Food prices
subject: food security
subject: price lags
subject: price margins
subject: price transmission
subject: hedonic price analysis.

description: Large structural shifts in the global economy are causing a dramatic rise in the price of food. Since 1994, food prices in Trinidad and Tobago have risen above 350%, faster than the price of other items. From March 2006 to 2007, the food component of the retail price index increased by 19% whilst the overall price index increased by 8%. Sizable and fluctuating price differences have been recorded between wholesale and retail prices. This paper looks at the development of retail food prices, its causes, the potential impact in terms of food security and possible policy recommendations. Through time series analysis, price margins and time lags are examined to determine the nature and lag of the response in municipal and retail price changes to wholesale prices. Non-linear hedonic models are estimated using auction price and quality data for specific commodities and markets to examine whether buyers have systematic preferences for specific attributes (weight, market class, sales lot size, market location and timing of sale) and whether they pay significantly different prices for these attributes consistent with their preferences. The results show that the price transmission between wholesale and retail happens in the same week and that price asymmetry, i.e., the different transmission of price increases compared with price decreases, is present for most products. Products characterized by relatively more standardization and homogeneity are shown to have lower retail margins and to behave symmetrically. The results also indicate that buyers have systematic preferences for specific product attributes and that these preferences are implicitly reflected in prices offered in traditional auction markets. The results underscore the need for increased producer supply response to capitalize on the opportunity offered by higher commodity prices by targeting specific attributes and by better timing production and marketing undertakings.
Astrocomp: a web service for the use of high performance computers in Astrophysics
Creators: name: Becciani, U.
name: Dolcetta, R. Capuzzo
name: Costa, A.
name: Di Matteo, P.
name: Miocchi, P.
name: Rosato, V.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Astrocomp is a joint project, developed by the INAF-Astrophysical Observatory of Catania, University of Roma La Sapienza and Enea. The project has the goal of providing the scientific community of a web-based user-friendly interface which allows running parallel codes on a set of high-performance computing (HPC) resources, without any need for specific knowledge about parallel programming and Operating Systems commands. Astrocomp provides, also, computing time on a set of parallel computing systems, available to the authorized user. At present, the portal makes a few codes available, among which: FLY, a cosmological code for studying three-dimensional collisionless self-gravitating systems with periodic boundary conditions; ATD, a parallel tree-code for the simulation of the dynamics of boundary-free collisional and collisionless self-gravitating systems and MARA, a code for stellar light curves analysis. Other codes are going to be added to the portal.
description: LaTeX with elsart.cls and harvard.sty (included). 7 pages. To be submitted to a specific journal
Einstein static universe as a brane in extra dimensions
Creators: name: Gruppuso, A.
name: Roessl, E.
name: Shaposhnikov, M.
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present a brane-world scenario in which two regions of $AdS_5$ space-time are glued together along a 3-brane with constant positive curvature such that {\em all} spatial dimensions form a compact manifold of topology $S^4$. It turns out that the induced geometry on the brane is given by Einstein's static universe. It is possible to achieve an anisotropy of the manifold which allows for a huge hierarchy between the size of the extra dimension $R$ and the size of the observable universe $R_U$ at present. This anisotropy is also at the origin of a very peculiar property of our model: the physical distance between {\em any two points} on the brane is of the order of the size of the extra dimension $R$ regardless of their distance measured with the use of the induced metric on the brane. In an intermediate distance regime $R \ll r \ll R_U$ gravity on the brane is shown to be effectively 4-dimensional, with corresponding large distance corrections, in complete analogy with the Randall-Sundrum II model. For very large distances $r \sim R_U$ we recover gravity in Einstein's static universe. However, in contrast to the Randall-Sundrum II model the difference in topology has the advantage of giving rise to a geodesically complete space.
description: 45 pages, 3 figures
Reaction Rates Uncertainties and the Production of F19 in AGB Stars
Creators: name: Lugaro, Maria
name: Ugalde, Claudio
name: Karakas, Amanda I.
name: Gorres, Joachim
name: Wiescher, Michael
name: Lattanzio, John C.
name: Cannon, Robert C.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present nucleosynthesis calculations and the resulting 19F stellar yields for a large set of models with different masses and metallicity. We find that the production of fluorine depends on the temperature of the convective pulses, the amount of primary 12C mixed into the envelope by third dredge up and the extent of the partial mixing zone. Then we perform a detailed analysis of the reaction rates involved in the production of 19F and the effects of their uncertainties. We find that the major uncertainties are associated with the 14C(alpha,gamma)18O and the 19F(alpha,p)22Ne reaction rates. For these two reactions we present new estimates of the rates and their uncertainties. The importance of the partial mixing zone is reduced when using our estimate for the 14C(alpha,gamma)18O rate. Taking into account both the uncertainties related to the partial mixing zone and those related to nuclear reactions, the highest values of 19F enhancements observed in AGB stars are not matched by the models. This is a problem that will have to be revised by providing a better understanding of the formation and nucleosynthesis in the partial mixing zone, also in relation to reducing the uncertainties of the 14C(alpha,gamma)18O reaction rate. At the same time the possible effect of Cool Bottom Processing at the base of the convective envelope should be included in the computation of AGB nucleosynthesis. This process could in principle help matching the highest 19F abundances observed by decreasing the C/O ratio at the surface of the star, while leaving the 19F abundance unchanged.
description: 40 pages, 8 figures, accepted for publication on the Astrophysical Journal
Supercomputer simulations of transmon quantum computers
Creators: name: Willsch, Dennis
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We develop a simulator for quantum computers composed of superconducting transmon qubits. The simulation model supports an arbitrary number of transmons and resonators. Quantum gates are implemented by time-dependent pulses. Nontrivial effects such as crosstalk, leakage to non-computational states, entanglement between transmons and resonators, and control errors due to the pulses are inherently included. The time evolution of the quantum computer is obtained by solving the time-dependent Schrödinger equation. The simulation algorithm shows excellent scalability on high-performance supercomputers. We present results for the simulation of up to 16 transmons and resonators. Additionally, the model can be used to simulate environments, and we demonstrate the transition from an isolated system to an open quantum system governed by a Lindblad master equation. We also describe a procedure to extract model parameters from electromagnetic simulations or experiments. We compare simulation results to experiments on several NISQ processors of the IBM Q Experience. We find nearly perfect agreement between simulation and experiment for quantum circuits designed to probe crosstalk in transmon systems. By studying common gate metrics such as the fidelity or the diamond distance, we find that they cannot reliably predict the performance of repeated gate applications or practical quantum algorithms. As an alternative, we find that the results from two-transmon gate set tomography have an exceptional predictive power. Finally, we test a protocol from the theory of quantum error correction and fault tolerance. We find that the protocol systematically improves the performance of transmon quantum computers in the presence of characteristic control and measurement errors.
description: PhD thesis, 247 pages, RWTH Aachen University, 2020. This dissertation includes and extends the results of arXiv:1709.06600 and arXiv:1805.05227
A scoping review protocol investigating the impact of heat stress upon health workforces and the mitigation strategies they employ to address heat stress and mitigation strategies
Creators: name: Elyce Green
name: Castelletto, Kathryn
name: Schubert, Julie
name: Kernaghan, Latitia
name: Freire, Katharine
Publisher: name: OSF Registries
Year: 2024
Subjects: subject: Medicine and Health Sciences
subject: health professional
subject: heat stress
subject: mitigation strategy

description: scoping review of heat stress upon health professionals and currently used mitigation strategies
The Nevis Model
Creators: name: Evelyn, E.
name: Evelyn, E.
Publisher: name: Unknown
Year: 2010
Subjects: Production Economics
Productivity Analysis

description: Prior to 1990, there was a production-led approach to crop production in Nevis. Farmers harvested their crops hoping to get them sold and not producing them for a specific market. This approach to production changed in 1990 when the completion of the Four Seasons Resort (FSR), a 5 star hotel, provided an opportunity to revise the Marketing Approach in Nevis. This revision eventually led to a multi- faceted marketing strategy for agricultural products. The Four Seasons Resort which offers 400 beds and employed in 1990 about 575 persons, created a large single market for agricultural produce. The multi-faceted approach involved joint activities of producers, research and extension in a closely monitored production and marketing system which developed into the „Nevis Model‟. This model encourages producers to become more oriented towards commercializing agriculture. In 1990, the Department of Agriculture along with Allied Agencies discussed with the management of the Four Seasons Resort about supplying local produce to the hotel. The hotel management agreed to become involved in an organized marketing programme and provided information pertaining to vegetable requirements, quantities needed and the price they were prepared to pay for each product. They welcomed the opportunity to do business with the farmers as a single entity. Following the initial discussions between research, extension and the producers, the Nevis Growers Association (NGA) was formed with 12 members. For the producers, this was an opportunity to focus on supplying produce for a specific market in a Market-Led system and to establish an Agro-Tourism Linkage. To facilitate the marketing of agricultural products, a Marketing Division was established within the Department of Agriculture. This Division coordinates the marketing of produce of all farmers and also function as a clearing-house for the NGA. Over the years, the Nevis Model has evolved and a much wider range of produce is now being provided. In addition, a number of animal products are also being provided.
Resolved Molecular Gas in a Quasar Host Galaxy at Redshift z=6.42
Creators: name: Walter, F.
name: Carilli, C.
name: Bertoldi, F.
name: Menten, K.
name: Cox, P.
name: Lo, K. Y.
name: Fan, X.
name: Strauss, M.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present high-resolution VLA observations of the molecular gas in the host galaxy of the highest redshift quasar currently known, SDSS J1148+5251 (z=6.42). Our VLA data of the CO(3-2) emission have a maximum resolution of 0.17'' x 0.13'' (~1 kpc), and enable us to resolve the molecular gas emission both spatially and in velocity. The molecular gas in J1148+5251 is extended to a radius of 2.5 kpc, and the central region shows 2 peaks, separated by 0.3'' (1.7 kpc). These peaks account for about half of the total emission, while the remainder is more extended. Each of these unresolved peaks contains a molecular gas mass of ~5 x 10^9 M_sun (similar to the total mass found in nearby ULIRGS) and has an intrinsic brightness temperature of ~35 K (averaged over the 1 kpc-sized beam), comparable to what is found in nearby starburst centers. Assuming that the molecular gas is gravitationally bound, we estimate a dynamical mass of ~4.5 x 10^10 M_sun within a radius of 2.5 kpc (~5.5 x 10^10 M_sun if corrected for a derived inclination of i~65 deg.). This dynamical mass estimate leaves little room for matter other than the detected molecular gas, and in particular the data are inconsistent with a ~10^12 M_sun stellar bulge which would be predicted based on the M_BH-sigma_bulge relation. This finding may indicate that black holes form prior to the assembly of the stellar bulges and that the dark matter halos are less massive than predicted based on the black hole/bulge mass relationship.
description: ApJ letters, Nov 2004, accepted
Teleparallel gravity as a gauge theory: coupling to matter with Cartan connection
Creators: name: Huguet, E.
name: Delliou, M. Le
name: Fontanini, M.
name: Lin, Z. -C.
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We present a consistent and complete description of the coupling to matter in the Teleparallel Equivalent to General Relativity (TEGR) theory built from a Cartan connection, as we proposed in previous works. A first theorem allows us to obtain parallel transport from the Cartan connection into a proper Ehresmann connection, while a second ensures to link the TEGR-Cartan connection to the Ehresmann one-form that contains the Levi-Civita connection. This yields a coupling to matter in agreement with observations and the Equivalence Principle. As the fundamental fields proceed from the Cartan connection, if one insists on interpreting TEGR as a gauge theory of translations, such translation gauge field can be extracted from the consistent theory presented. However, this would entail a fundamental change in the structures known for gauge theory and a split between gauge field and connection is imperative. The willingness to take such a step is left to the reader.
description: 9pp no Figs
On the Stacking Charge Order in NaV2O5
Creators: name: Chitov, G. Y.
name: Gros, C.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We propose a mechanism for the observed stacking charge order in the quarter-filled ladder compound NaV2O5. Via a standard mapping of the charge degrees of freedom onto Ising spins we explain the stacking order as a result of competition between couplings of the nearest and next-nearest planes with the 4-fold degenerate super-antiferroelectric in-plane order.
description: 4 pages, 5 figures
Using Source Code Density to Improve the Accuracy of Automatic Commit Classification into Maintenance Activities
Creators: name: Hönel, Sebastian
name: Ericsson, Morgan
name: Löwe, Welf
name: Wingkvist, Anna
Publisher: name: arXiv
Year: 2020
Subjects: subject: Software Engineering (cs.SE)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences
subject: D.2

description: Source code is changed for a reason, e.g., to adapt, correct, or adapt it. This reason can provide valuable insight into the development process but is rarely explicitly documented when the change is committed to a source code repository. Automatic commit classification uses features extracted from commits to estimate this reason. We introduce source code density, a measure of the net size of a commit, and show how it improves the accuracy of automatic commit classification compared to previous size-based classifications. We also investigate how preceding generations of commits affect the class of a commit, and whether taking the code density of previous commits into account can improve the accuracy further. We achieve up to 89% accuracy and a Kappa of 0.82 for the cross-project commit classification where the model is trained on one project and applied to other projects. Models trained on single projects yield accuracies of up to 93% with a Kappa approaching 0.90. The accuracy of the automatic commit classification has a direct impact on software (process) quality analyses that exploit the classification, so our improvements to the accuracy will also improve the confidence in such analyses.
description: 23 pages, to be published in The Journal of Systems and Software
The National Agricultural Market Information System of Trinidad and Tobago (NAMIS), as a stimulus for development of regional agri-food production
Creators: name: Ragbir, Prakash
name: Ali, Avenish
name: Johnson, Elbert
name: Ragbir, Prakash
name: Ali, Avenish
name: Johnson, Elbert
Publisher: name: Unknown
Year: 2010
Subjects: International Relations/Trade
Production Economics
Productivity Analysis
Teaching/Communication/Extension/Profession

description: Availability and accessibility of appropriate information has been identified as one of the major constraints to the advancement of the agricultural sector both locally and regionally. To address this problem, in January 2007, NAMDEVCO launched its National Agricultural Market Information System (NAMIS). This system is currently being used as a tool that provides timely and accurate information to stakeholders in the Agri-food sector thus enabling them to make informed management decisions. The collection methodology employed allows for the collection of wholesale and retail prices and volume information for fresh produce, sea-food, and processed products in over 80 different collection areas throughout Trinidad and Tobago. To date, NAMIS has proven to be a valuable asset to the agricultural sector by effecting a reduction the price spreads between wholesale and retail, leveling the playing field between buyers and sellers and by identifying areas of opportunity. By May 2009, over 1 million hits have been recorded to the website; an average of 3,000 per month. The Buyers and Sellers Forum have so far accounted for sale of approximately 1.53 million kg of fresh produce among 173 registered users in Trinidad and Tobago; an average of 40,000kg per month. The system has the potential of becoming the model for market information and intelligence, as well as other forms of advanced markets and trading systems such as e-commerce and commodity exchanges.
B and B_S decay constants from moments of Finite Energy Sum Rules in QCD
Creators: name: Bodi-Esteban, F.
name: Bordes, J.
name: Penarrocha, J.
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We use an appropriate combination of moments of finite energy sum rules in QCD in order to compute the B_q-meson decays constants f_B and f_{B_s}.We perform the calculation using a two-loop computation of the imaginary part of the pseudoscalar two point function in terms of the running bottom quark mass. The results are stable with the so called QCD duality threshold and they are in agreement with the estimates obtained from Borel transform QCD sum rules and lattice computations.
description: 11 pages, 2 figures
A study of the role of cortisol in the osmoregulatory behavior of a teleost, Mugil cephalus
Creators: name: Jackson, Peter Richard, 1948-
Publisher: name: The University of Texas at Austin
Year: 1973
Subjects: subject: Striped mullet
subject: Mugil cephalus
subject: Hydrocortisone effects
subject: Cortisol effects
subject: Metyrapone effects
subject: Sodium
subject: Potassium
subject: Calcium
subject: Hormone effects
subject: Striped mullet--Effect of drugs on
subject: Osmoregulation
subject: Adrenocortical hormones
subject: Hydrocortisone

description: The effects of injections of metyrapone, an inhibitor of corticosteroid synthesis, cortisol and a combination of these treatments were studied to determine the effects of corticosteroids on the plasma sodium, potassium and calcium levels in marine and fresh water mullet, Mugil cephalus. The metyrapone effects could not be interpreted in terms of the physiology of the teleost interrenal gland and were probably due to the narcotic-like side effects of the drug. Cortisol was found to enhance the osmoregulatory mechanisms necessary for the survival of the fish in sea and fresh water. Plasma sodium, potassium and calcium levels were significantly lowered in sea water mullet after cortisol injections, indicating that this hormone is effective in enhancing the normal elimination of excess ions in this medium. Fresh water mullet were able to accumulate significantly higher levels of sodium, potassium and calcium after being injected with cortisol, indicating that the hormone enhances their ability to osmoregulate in a hypotonic environment. A gas chromatographic analysis of cortisol extracted from the plasma of mullet kept in sea and fresh water for 24 hours indicated that fresh water fish had about twice the circulating levels of this hormone. It was concluded that the corticosteroids are necessary for the maintenance of ions in sea and fresh water mullet and that the fish require more of these hormones to survive in fresh water