cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Clustering versus Statistical Analysis for SCA: when Machine Learning is Better
Creators: name: Aftowicz, Marcin
name: Kabin, Ievgen
name: Dyka, Zoya
name: Langendoerfer, Peter
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences
subject: E.3; I.2
subject: 68M25

description: Evaluation of the resistance of implemented cryptographic algorithms against SCA attacks, as well as detecting of SCA leakage sources at an early stage of the design process, is important for an efficient re-design of the implementation. Thus, effective SCA methods that do not depend on the key processed in the cryptographic operations are beneficially and can be a part of the efficient design methodology for implementing cryptographic approaches. In this work we compare two different methods that are used to analyse power traces of elliptic curve point multiplications. The first method the comparison to the mean is a simple method based on statistical analysis. The second one is K-means - the mostly used unsupervised machine learning algorithm for data clustering. The results of our early work showed that the machine learning algorithm was not superior to the simple approach. In this work we concentrate on the comparison of the attack results using both analysis methods with the goal to understand their benefits and drawbacks. Our results show that the comparison to the mean works properly only if the scalar processed during the attacked kP execution is balanced, i.e. if the number of '1' in the scalar k is about as high as the number of '0'. In contrast to this, K-means is effective also if the scalar is highly unbalanced. It is still effective even if the scalar k contains only a very small number of '0' bits.
Amblyomma cajennense
Creators: name: Basu, A. K.
name: Basu, M.
name: Adesiyun, A. A.
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Ixodida
Ixodidae
Amblyomma
Amblyomma cajennense

description: Amblyomma cajennense
 Neumann (1899) is credited for the identification of A. cajennense from Trinidad. Nuttall et al. (1926) mentioned that A. cajennense, a common tick species in the West Indies and Central and South America, was often a troublesome pest at certain seasons of the year, when the larvae swarm in thousands in the grass and herbage and attack both man and domestic animals with avidity. Aitken et al. (1958) recorded ’The 1958 Cayenne tick outbreak’ at the Lagoon Doux Estate, south of Mayaro, where only the labourers showed serious effects of tick exposure, such as bout and skin irritations. These authors found A. cajennense on a variety of animals including man. Spraying dichlorodiphenyltrichloroethane (DDT), Gamma Benzene Hexachloride (GBH), chlordane and dieldrin helped to control the tick population. Smith (1973) found very large populations of A. cajennense ticks in infested areas with uncontrolled grass growth and suggested that a reduction in grass length and the removal of tree shade could help reduce the tick populations. He also studied the distribution of A. cajennense in Trinidad and Tobago; this tick was found only in Trinidad on the Cedros peninsula and on east coast at Mayaro. Smith (1974) recorded A. cajennense in ruminants, equines, dogs and man. The ecology and life cycle of this tick was also investigated by Dindial (1977) and Smith (1975), respectively. Dindial (1977) found that A. cajennense was present in the coastal regions of Manzanilla, Mayaro, Guayaguauare and the Cedros Peninsula area of Trinidad and was absent in Tobago. The presence of A. cajennense on cattle was also established by Clarkson (1969) and Rawlins (1977) in Trinidad. Lans (2002) reported a second outbreak of this tick from 1994 to 1996 in Cedros and Mayaro linked to the presence of free-ranging cattle on the coconut estates.
 Amblyomma cajennense is known to transmit Wad Medani in Jamaica and Rickettsia rickettsii (Rocky Mountain Spotted Fever) (Jongejan and Uilenberg 2004).
Distribution: ranges from southern USA to northern Argentina and Caribbean Islands (Cruz 2001; Voltzit 2007).
description: Published as part of Basu, A. K., Basu, M. & Adesiyun, A. A., 2012, A Review On Ticks (Acari: Ixodoidea: Ixodidae, Argasidae), Associated Pathogens And Diseases Of Trinidad And Tobago, pp. 39-50 in Acarologia 52 (1) on page 43, DOI: 10.1051/acarologia/20122034, http://zenodo.org/record/4667077
Mansueto et al_Supplemental File 1.doc
Creators: name: Mansueto, Pasquale
Publisher: name: figshare
Year: 2020
Subjects: subject: 110701 Allergy
subject: FOS: Clinical medicine
subject: 110307 Gastroenterology and Hepatology

description: Supplemental File 1 for American Journal of Physiology-Gastrointestinal and Liver Physiology submission
Estimating Economic Efficiency under Risk for Agricultural Cooperatives
Creators: name: Pokharel, Krishna P.
name: Featherstone, Allen M.
name: Archer, David W.
name: Pokharel, Krishna P.
name: Featherstone, Allen M.
name: Archer, David W.
Publisher: name: Unknown
Year: 2018
Subjects: subject: Agribusiness
subject: Agricultural Finance
subject: cost efficiency
subject: revenue efficiency
subject: downside risk

description: This study examined the impact of downside risk on cost efficiency (CE) and revenue efficiency (RE) for a sample of agricultural cooperatives. Downside risk is an appropriate measure of risk as it accounts for loss below the target return level regardless of individuals’ risk preference. The semi-variance of return on equity was used a measure of downside risk. CE and RE were estimated using data envelopment analysis (DEA) without adjusting for downside risk and then re-estimated adjusting for downside risk. The average CE and RE scores were higher with the inclusion of downside risk than the scores without downside risk. The DEA method without accounting for risk overestimates inefficiency and may misguide managers on adjustments needed to improve performance.
Monitoring of the Central Region of the Globular Cluster M15 = NGC 7078: New Variable Stars
Creators: name: Zheleznyak, Alexander P.
name: Kravtsov, Valery V.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We obtained a series of more than two hundred R-band CCD images for the crowded central (115"x77") region of the metal-poor globular cluster M15 with an angular resolution of 0.5"-0.9" in most images. Optimal image subtraction was used to identify variable stars. Brightness variations were found in 83 stars, 55 of which were identified with known cluster variables and the remaining 28 are candidates for new variables. Two of them are most likely SX Phe variables. The variability type of two more stars is incertain. The remaining stars were tentatively classified as RR Lyrae variables. A preliminary analysis of published data and our results shows that the characteristics of RR Lyrae variables in the densest part (r<35") of the cluster probably change. More specifically, the maximum of the period distribution of first- and second-overtone (RR1, RR2) pulsating stars shifts toward shorter periods; i.e., there is an increase in the fraction of stars pulsating with periods < 0.3d and a deficiency of stars with 0.35d-0.40d. The ratio of the number of these short-period RR Lyrae variables to the number of fundamental-tone (RR0) pulsating variables changes appreciably. We found and corrected the error of transforming the coordinates of variables V128-155 in M15 to the coordinate system used in the catalog of variable stars in globular clusters.
description: 29 pages, 6 figures, 2 tables
Designing a formal proposal for a LFS community kitchen
Creators: name: Tang, Wen Zhe (Wilson)
name: Wong, Cecilia
name: Mao, WeiWei
name: Yu, Ralph
name: Hsu, Yu-Chen (Jen)
Publisher: name: The University of British Columbia
Year: 2012

description: There has been an on-going need from groups within the Faculty of Land and Foods for a kitchen space. In our specific scenario, we have been able to create an efficient and attractive community kitchen layout to fit that need. In addition, we have developed a proper management scheme for the kitchen itself. We were also able to create a list of activities the kitchen design could support, along with the necessary equipment and appliances needed to run a successful kitchen. Included in our proposal is also a layout of the kitchen’s floor-plan and financial estimates (including potential project sponsorships). Over the course of our proposal development, we have received several recommendations from the stakeholders within this project. The main advice given to our team was to expand the Agora Café instead of creating a separate community kitchen. This idea will be further explained within the following proposal. Furthermore, our team has developed some recommendations of our own for future LFS students and teaching staff if they are to be involved in a similar scenario. Such recommendations include a more efficient management scheme (which, again, will be more detailed in the following proposal). 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.”
Economic Valuation for Groundwater resource in Southern Ogallala Aquifer
Creators: name: Sun, Lianqun
name: Williams, Ryan B.
name: Mitchell, Donna
name: Silva, Nirodha De
name: Sun, Lianqun
name: Williams, Ryan B.
name: Mitchell, Donna
name: Silva, Nirodha De
Publisher: name: Unknown
Year: 2018
Subjects: subject: Environmental Economics and Policy
subject: Ogallala Aquifer
subject: Option value
subject: Contingent Valuation

description: This research focuses on the southernmost portion of the Ogallala Aquifer, underlying the Texas High Plains and eastern New Mexico. Irrigated agriculture and industrial/municipal water demand are in competition for this essentially nonrenewable resource. The absence of a market mechanism has resulted in policy to restrict agricultural withdrawals in order to conserve water for future municipal needs. These policies are established in the absence of an estimated social value for the water resources. This paper investigates the possibility of the marketable option value for maintaining groundwater resources in the southern Ogallala Aquifer as compared to an estimated existence value. We utilize a referendum format contingent valuation (CV) survey of the western portion of Texas. Both the estimates of existence value and option value are reasonable, given current use values. Factors influencing both estimates include age, the existence of children, importance of the aquifer for household income, and pro-environmental attitudes. We conclude by comparing the two estimates. Given that property rights in Texas are governed by the rule of capture, we contend – contrary to arguments presented in Freeman (2003) – that option value is the appropriate social value measure.
Searching for Thermal Inversion Agents in the Transmission Spectrum of MASCARA-2b/KELT-20b: Detection of Neutral Iron and Ionised Calcium H$\&$K Lines
Creators: name: Nugroho, Stevanus K.
name: Gibson, Neale P.
name: de Mooij, Ernst J. W.
name: Watson, Chris A.
name: Kawahara, Hajime
name: Merritt, Stephanie
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We analyse the transmission spectra of KELT-20b/MASCARA-2b to search for possible thermal inversion agents. The data consist of three transits obtained using HARPSN and one using CARMENES. We removed stellar and telluric lines before cross-correlating the residuals with spectroscopic templates produced using a 1D plane-parallel model assuming an isothermal atmosphere and chemical equilibrium at solar metallicity. Using a likelihood-mapping method, we detect Fe\,{\sc i} at $>$ 13-$σ$, Ca\,{\sc ii} H$\&$K at $>$ 6-$σ$ and confirm the previous detections of Fe\,{\sc ii}, Ca\,{\sc ii} IRT and Na\,{\sc i} D. The detected signal of Fe\,{\sc i} is shifted by -3.4$\pm$0.4 km s$^{-1}$ from the planetary rest frame, which indicates a strong day-night wind. Our likelihood-mapping technique also reveals that the absorption features of the detected species extend to different altitudes in the planet's atmosphere. Assuming that the line lists are accurate, we do not detect other potential thermal inversion agents (NaH, MgH, AlO, SH, CaO, VO, FeH and TiO) suggesting that non-chemical equilibrium mechanisms (e.g. a cold-trap) might have removed Ti- and V-bearing species from the upper atmosphere. Our results, therefore, shows that KELT-20b/MASCARA-2b cannot possess an inversion layer caused by a TiO/VO-related mechanism. The presence of an inversion layer would therefore likely be caused by metal atoms such as Fe\,{\sc i} and Fe\,{\sc ii}. Finally, we report a double-peak structure in the Fe\,{\sc i} signal in all of our data-sets that could be a signature of atmospheric dynamics. However, further investigation is needed to robustly determine the origin of the signal.
description: 20 pages, 16 figures, 3 tables, Accepted for publication in MNRAS
One-dimensional moire charge density wave in the hidden order state of URu2Si2 induced by fracture
Creators: name: Herrera, Edwin
name: Barrena, Victor
name: Guillamon, Isabel
name: Galvis, Jose Augusto
name: Herrera, William J.
name: Castilla, Jose
name: Aoki, Dai
name: Flouquet, Jacques
name: Suderow, Hermann
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Moiré patterns can lead to fundamentally new electronic behavior when formed between two atomic lattices slightly shifted with respect to each other. A solid is however not just characterized by the atomic lattice, but also by charge or magnetic excitations that do not need to be commensurate to the lattice. This raises the question if one can obtain a moiré by combining periodic electronic modulations and the atomic lattice. Here we report on the discovery of a one-dimensional charge density wave (1D-CDW) which is a moiré pattern between the atomic lattice and a hot spot for electronic scattering in the bandstructure of the hidden order (HO) state of URu$_2$Si$_2$. The moiré is produced by fracturing the crystal at low temperatures. Our results suggest that charge interactions are among the most relevant features competing with HO in URu$_2$Si$_2$.
X-ray Processing of ChaMPlane Fields: Methods and Initial Results for Selected Anti-Galactic Center Fields
Creators: name: Hong, JaeSub
name: Berg, Maureen van den
name: Schlegel, Eric M.
name: Grindlay, Jonathan E.
name: Koenig, Xavier
name: Laycock, Silas
name: Zhao, Ping
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We describe the X-ray analysis procedure of the on-going Chandra Multiwavelength Plane (ChaMPlane) survey and report the initial results from the analysis of 15 selected anti-Galactic center observations (90 deg < l < 270 deg). We describe the X-ray analysis procedures for ChaMPlane using custom-developed analysis tools appropriate for Galactic sources but also of general use: optimum photometry in crowded fields using advanced techniques for overlapping sources, rigorous astrometry and 95% error circles for combining X-ray images or matching to optical/IR images, and application of quantile analysis for spectral analysis of faint sources. We apply these techniques to 15 anti-Galactic center observations (of 14 distinct fields) in which we have detected 921 X-ray point sources. We present logN-logS distributions and quantile analysis to show that in the hard band (2 - 8 keV) active galactic nuclei dominate the sources. Complete analysis of all ChaMPlane anti-Galactic center fields will be given in a subsequent paper, followed by papers on sources in the Galactic center and Bulge regions.
description: 13 pages, 5 figures, 8 tables, accepted in ApJ for publication
Optimal Control of Moving Sets
Creators: name: Bressan, Alberto
name: Chiri, Maria Teresa
name: Salehi, Najmeh
Publisher: name: arXiv
Year: 2022
Subjects: subject: Optimization and Control (math.OC)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 49J20, 49J15, 49K15, 49K20

description: Motivated by the control of invasive biological populations, we consider a class of optimization problems for moving sets $t\mapsto \Omega(t)\subset\mathbb{R}^2$. Given an initial set $\Omega_0$, the goal is to minimize the area of the contaminated set $\Omega(t)$ over time, plus a cost related to the control effort. Here the control function is the inward normal speed along the boundary $\partial \Omega(t)$. We prove the existence of optimal solutions, within a class of sets with finite perimeter. Necessary conditions for optimality are then derived, in the form of a Pontryagin maximum principle. Additional optimality conditions show that the sets $\Omega(t)$ cannot have certain types of outward or inward corners. Finally, some explicit solutions are presented.
description: 36 pages, 13 figures
Effectiveness of United States Corn Futures Contracts as Hedging Instruments for Mexican Corn Producers
Creators: name: Cuautle-Parra, David
name: Riley, John M.
name: Cuautle-Parra, David
name: Riley, John M.
Publisher: name: Unknown
Year: 2018
Subjects: subject: Risk and Uncertainty
subject: Hedge Ratio
subject: Risk Management
subject: Mexico

description: Mexico pledged 550 million pesos ($41 million USD) in 2012 to fund a price risk management program for agricultural producers (Stargardter, 2012). The program utilizes risk management tools based in the United States, primarily options on futures contracts. In some cases, the subsidy levels for option premiums were as high as 100%, but the program has scaled these back to an 85% subsidy or less. The purpose of this project is to determine the effectiveness of United States corn futures contracts as hedging instruments for Mexican corn producers. Local cash prices for multiple locations across Mexico are reported by La Secretaría de Agricultura, Ganadería, Desarrollo Rural, Pesca y Alimentación. These prices are available weekly from January 1998 to present. Futures prices for corn are from the CME Group. To determine the effectiveness of the CME Group corn futures contract as a price risk tool for Mexican corn producers linear regression models are estimated where the local cash price is the dependent variable and the futures price is the independent variable. The results of the model offer insight on the basis and optimal hedge ratio for Mexican producers, and we can comment that using futures contracts of yellow corn negotiated at the CME Group as a price risk management tool is effective if we consider white corn national data, since our regression model proves with a ninety five percent of confidence level that prices in Mexico are explain eighty three point five percent by prices at the CME group. However, basis given by the government appear to be insufficient according to our analysis.
downsi
Creators: name: Basu, A. K.
name: Basu, M.
name: Adesiyun, A. A.
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia

description: Ixodes downsi
 Kohls (1957) first recorded a new species of tick, I. downsi on bats (Anoura geoffroyi) in Aripo Cave, Trinidad. Gonzalez-Acuna et al. (2008) mentioned the presence of this tick in Trinidad and Tobago and stated that it is unclear whether the principal hosts are Chiroptera or Aves.
 Distribution: Venezuela (Gonzalez-Acuna et al. 2008).
description: Published as part of Basu, A. K., Basu, M. & Adesiyun, A. A., 2012, A Review On Ticks (Acari: Ixodoidea: Ixodidae, Argasidae), Associated Pathogens And Diseases Of Trinidad And Tobago, pp. 39-50 in Acarologia 52 (1) on page 45, DOI: 10.1051/acarologia/20122034, http://zenodo.org/record/4667077
Constraining the Nature of the Galactic Center X-ray Source Population
Creators: name: Laycock, S.
name: Grindlay, J.
name: Berg, M. van den
name: Zhao, P.
name: Hong, J.
name: Koenig, X.
name: Schlegel, E. M.
name: Persson, S. E.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We searched for infrared counterparts to the cluster of X-ray point sources discovered by Chandra in the Galactic Center Region (GCR). While the sources could be white dwarfs, neutron stars, or black holes accreting from stellar companions, their X-ray properties are consistent with magnetic Cataclysmic Variables, or High Mass X-ray Binaries (HMXB) at low accretion-rates. A direct way to decide between these possibilities and hence between alternative formation scenarios is to measure or constrain the luminosity distribution of the companions. Using infrared (J, H, K, Br-gamma) imaging, we searched for counterparts corresponding to typical HMXB secondaries: spectral type B0V with K<15 at the GCR. We found no significant excess of bright stars in Chandra error circles, indicating that HMXBs are not the dominant X-ray source population, and account for fewer than 10% of the hardest X-ray sources.
description: 4 pages, 3 figures, 1 table, accepted in ApJ Letters for publication
Rhipicephalus (Boophilus) microplus
Creators: name: Basu, A. K.
name: Basu, M.
name: Adesiyun, A. A.
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Ixodida
Ixodidae
Rhipicephalus
Rhipicephalus microplus

description: Rhipicephalus (Boophilus) microplus
 Aitken et al. (1958) recorded a few specimens of the southern cattle tick R. (B.) microplus from cattle and sheep in Trinidad. Williams and Gonzalez (1968) observed that Holstein heifers imported into Trinidad from Canada with the intent to develop a dairy industry were exposed to tick-infested pastures and that these exotic cattle suffered from a febrile disease associated with marked anaemia, occasional haemoglobinuria and sometimes death within two to six weeks after importation and introduction to tick-infested pastures. They also confirmed the detection of Babesia spp. and Anaplasma marginale from the blood of the infected cattle. This established the presence of R. (B.) microplus ticks in Trinidad, as these ticks are vectors of both the pathogens. The presence of R. (B.) microplus on cattle in Trinidad was confirmed by Aitken et al. (1969), Clarkson (1969) and Rawlins (1977). Smith (1973) studied the distribution of R. (B.) microplus in Trinidad and Tobago. Rhipicephalus (B.) microplus was found throughout both islands, except on land newly cleared from forest. Furthermore, Smith (1974) recorded this tick exploiting ruminants and equines. The prevalence and biology of R. (B.) microplus was investigated by Dindial (1977) and he also found the presence of R. (B.) microplus ticks all over the country. Spraying dichlorodiphenyltrichloroethane (DDT), Gamma Benzene Hexachloride (GBH), chlordane and dieldrin was reported to have helped to control this tick population in Trinidad. Polar and co-investigators (2005) reported the use of entomopathogenic fungi Metarhizium anisopliae to control R. (B.) microplus at Aripo livestock station in Trinidad. Polar (2007) found that Metarhizium anisopliae was effective against all development stages of R. (B.) microplus and Rhipicephalus sanguineus, except larvae of the latter.
 R. (B.) microplus is known to transmit numerous parasites: Babesia bovis and B. bigemina (Bovine babesiosis), Anaplasma marginale (bovine anaplasmosis) and Theileria equi (equine piroplasmosis) (Jongejan and Uilenberg 2004). A virus, Wad Medani has also been reported to be transmitted by R. (B.) microplus in Singapore and Malayasia (Labuda and Nuttall 2004).
Distribution: Cosmopolitan
description: Published as part of Basu, A. K., Basu, M. & Adesiyun, A. A., 2012, A Review On Ticks (Acari: Ixodoidea: Ixodidae, Argasidae), Associated Pathogens And Diseases Of Trinidad And Tobago, pp. 39-50 in Acarologia 52 (1) on pages 45-46, DOI: 10.1051/acarologia/20122034, http://zenodo.org/record/4667077
Approaching itinerant magnetic quantum criticality through a Hund's coupling induced electronic crossover in the YFe$_2$Ge$_2$ superconductor
Creators: name: Zhao, D.
name: Wo, H. L.
name: Li, J.
name: Song, D. W.
name: Zheng, L. X.
name: Li, S. J.
name: Nie, L. P.
name: Luo, X. G.
name: Zhao, J.
name: Wu, T.
name: Chen, X. H.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Here, by conducting a systematic $^{89}$Y NMR study, we explore the nature of the magnetic ground state in a newly discovered iron-based superconductor YFe$_2$Ge$_2$. An incoherent-to-coherent crossover due to the Hund's coupling induced electronic correlation is revealed below the crossover temperature $T^*\sim 75\pm15\,\mathrm{K}$. During the electronic crossover, both the Knight shift ($K$) and the bulk magnetic susceptibility ($χ$) exhibit a similar nonmonotonic temperature dependence, and a so-called Knight shift anomaly is also revealed by a careful $K$-$χ$ analysis. Such an electronic crossover has been also observed in heavily hole-doped pnictide superconductors \emph{A}Fe$_2$As$_2$ (\emph{A} = K, Rb, and Cs), which is ascribed to the Hund's coupling induced electronic correlation. Below $T^*$, the spin-lattice relaxation rate divided by temperature $(1/T_1T)$ shows a similar suppression as the Knight shift, suggesting the absence of critical spin fluctuations. This seems to be in conflict with a predicted magnetic quantum critical point (QCP) near this system. However, considering a $\mathbf{q}$-dependent "filter" effect on the transferred hyperfine field, a predominant spin fluctuation with A-type correlation would be perfectly filtered out at $^{89}$Y sites, which is consistent with the recent inelastic neutron scattering results. Therefore, our results confirm that, through a Hund's coupling induced electronic crossover, the magnetic ground state of YFe$_2$Ge$_2$ becomes close to an itinerant magnetic QCP with A-type spin fluctuations. In addition, the possible superconducting pairing due to spin fluctuations is also discussed.
description: 6 pages, 4 figures, supplementary information available upon request
Matrix Completion with Hierarchical Graph Side Information
Creators: name: Elmahdy, Adel
name: Ahn, Junhyung
name: Suh, Changho
name: Mohajer, Soheil
Publisher: name: arXiv
Year: 2022
Subjects: subject: Machine Learning (stat.ML)
subject: Information Theory (cs.IT)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: We consider a matrix completion problem that exploits social or item similarity graphs as side information. We develop a universal, parameter-free, and computationally efficient algorithm that starts with hierarchical graph clustering and then iteratively refines estimates both on graph clustering and matrix ratings. Under a hierarchical stochastic block model that well respects practically-relevant social graphs and a low-rank rating matrix model (to be detailed), we demonstrate that our algorithm achieves the information-theoretic limit on the number of observed matrix entries (i.e., optimal sample complexity) that is derived by maximum likelihood estimation together with a lower-bound impossibility result. One consequence of this result is that exploiting the hierarchical structure of social graphs yields a substantial gain in sample complexity relative to the one that simply identifies different groups without resorting to the relational structure across them. We conduct extensive experiments both on synthetic and real-world datasets to corroborate our theoretical results as well as to demonstrate significant performance improvements over other matrix completion algorithms that leverage graph side information.
description: 53 pages, 3 figures, 1 table. Published in NeurIPS 2020. The first two authors contributed equally to this work. In this revision, achievability proof technique is updated and typos are corrected. arXiv admin note: substantial text overlap with arXiv:2109.05408
Inverse magnetic catalysis -- how much do we know about?
Creators: name: Bandyopadhyay, Aritra
name: Farias, Ricardo L S
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Lattice (hep-lat)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Some of the advances made in the literature to understand the phase transitions of quark matter in the presence of strong magnetic field and finite temperature (zero quark chemical potential) are reviewed. We start by discussing the physics behind the Magnetic catalysis (MC) at zero/finite temperature and then focus on the lattice predictions for inverse magnetic catalysis (IMC) at high temperature and strong magnetic fields. Possible explanations for the IMC are covered as well. Finally, we discuss recent efforts to modify QCD (quantum chromodynamics) effective models in order to reproduce the IMC observed on the lattice simulations. We emphasize the fact that applying thermo-magnetic effects on the coupling constant of the NJL model significantly improve the effectiveness of the NJL model to obtain a reasonable physical description of hot and magnetized quark matter being in agreement with lattice results.
description: Invited mini-review submitted to EPJST. v2 improved few sentences throughout the paper, added references
A Spatial Econometric Analysis of Cotton Yield Response to Nitrogen
Creators: name: Li, Xiaofei
name: Varco, Jac
name: Fox, Amelia
name: Li, Xiaofei
name: Varco, Jac
name: Fox, Amelia
Publisher: name: Unknown
Year: 2018
Subjects: subject: Public Economics
subject: Cotton nitrogen response
subject: spatial econometric model
subject: OLS
subject: field experimental data

description: Cotton lint yield response to nitrogen levels has been studied extensively based on randomized complete block design experiments. In order to estimate the response curve, the most widely used statistical model is the ordinary least squares (OLS) regression model. Yield errors at specific plots conditioning on nitrogen treatments are canceled out by the model. However, statistically OLS estimates are the most efficient only when the yield errors are completely random. In the experiment practice, the yields errors are often spatially correlated across plots, mainly driven by the unobserved (and uncontrolled) soil characteristics in the field. In the presence of spatially non-random errors, spatial econometric models provide more accurate estimates than OLS. This study applies the Spatial Error model to the estimation of cotton yield response to nitrogen. Our data are from field experiments conducted during three crop years from 2012 through 2014 in three separate locations in Mississippi. Results show that the response coefficients estimated by Spatial Error model are significantly different from those of OLS model. Statistical theory and numerical simulation both prove the spatial model outperforms OLS. This study suggests spatial econometric model is more desirable in analyzing cotton field experiment data compared to OLS.
Influence of the projectile geometry on the momentum transfer from a kinetic impactor and implications for the DART mission
Creators: name: Raducan, S. D.
name: Jutzi, M.
name: Davison, T. M.
name: DeCoster, M. E.
name: Graninger, D. M.
name: Owen, J. M.
name: Stickle, A. M.
name: Collins, G. S.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The DART spacecraft will impact Didymos's secondary, Dimorphos, at the end of 2022 and cause a change in the orbital period of the secondary. For simplicity, most previous numerical simulations of the impact used a spherical projectile geometry to model the DART spacecraft. To investigate the effects of alternative, simple projectile geometries on the DART impact outcome we used the iSALE shock physics code in two and thee-dimensions to model vertical impacts of projectiles with a mass and speed equivalent to the nominal DART impact, into porous basalt targets. We found that the simple projectile geometries investigated here have minimal effects on the crater morphology and momentum enhancement. Projectile geometries modelled in two-dimensions that have similar surface areas at the point of impact, affect the crater radius and the crater volume by less than 5%. In the case of a more extreme projectile geometry (i.e., a rod, modelled in three-dimensions), the crater was elliptical and 50% shallower compared to the crater produced by a spherical projectile of the same momentum. The momentum enhancement factor in these test cases, commonly referred to as beta, was within 7% for the 2D simulations and within 10% for the 3D simulations, of the value obtained for a uniform spherical projectile. The most prominent effects of projectile geometry are seen in the ejection velocity as a function of launch position and ejection angle of the fast ejecta that resides in the so-called `coupling zone'. These results will inform the LICIACube ejecta cone analysis.
Spin Frustration in an Exactly Solvable Ising-Heisenberg Diamond Chain
Creators: name: Jascur, Michal
name: Strecka, Jozef
Publisher: name: arXiv
Year: 2003
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: Exact results of a mixed spin-1/2 and spin-1 Ising-Heisenberg diamond chain are obtained applying a generalized decoration-iteration transformation. Depending on the values of external field, exchange parameters and anisotropy, there exist six different phases in the ground state of the system. The magnetic order of these phases is briefly described in this work.
description: 3 pages, 2 figures, to be presented at conference ICM 2003
Feasibility of Using Cover Crops to Enhance Soil Organic Matter and Crop Yield in New Mexico
Creators: name: C., Apar G.
name: Ghimire, Rajan
name: Blayney, Don
name: Acharya, Ram N.
name: C., Apar G.
name: Ghimire, Rajan
name: Blayney, Don
name: Acharya, Ram N.
Publisher: name: Unknown
Year: 2018
Subjects: subject: Crop Production/Industries
subject: wheat-fallow system, cover crops, business risk and benefit, stochastic dominance

description: This study evaluates the potential of using cover crop to enhance yield and farm profitability using experimental data from Clovis Agricultural Research Center, New Mexico. The analysis includes seven different combinations of cover crops and one fallow treatment as a control. The Monte Carlo simulations results show that a cover crop treatment that includes a mixture of six crops (6XM) yields highest net return, while the treatment that uses only canola provides a least risky option.
Parafermionic theory with the symmetry Z_N, for N even
Creators: name: Dotsenko, Vladimir S
name: Jacobsen, Jesper Lykke
name: Santachiara, Raoul
Publisher: name: arXiv
Year: 2003
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Condensed Matter (cond-mat)
subject: FOS: Physical sciences

description: Following our previous papers (hep-th/0212158 and hep-th/0303126) we complete the construction of the parafermionic theory with the symmetry Z_N based on the second solution of Fateev-Zamolodchikov for the corresponding parafermionic chiral algebra. In the present paper we construct the Z_N parafermionic theory for N even. Primary operators are classified according to their transformation properties under the dihedral group (Z_N x Z_2, where Z_2 stands for the Z_N charge conjugation), as two singlets, doublet 1,2,...,N/2-1, and a disorder operator. In an assumed Coulomb gas scenario, the corresponding vertex operators are accommodated by the Kac table based on the weight lattice of the Lie algebra D_{N/2}. The unitary theories are representations of the coset SO_n(N) x SO_2(N) / SO_{n+2}(N), with n=1,2,.... We suggest that physically they realise the series of multicritical points in statistical systems having a Z_N symmetry.
title: In Vivo Study of Nuclear-Localized Protein-Protein Interactions in Plant Cells
Creators: name: Formiggini, Fabio
Publisher: name: The Open University
Year: 2003

description: Recent results suggest that key events controlling light regulated gene expression in plants are import of the phytochrome photoreceptors into the nucleus followed by their binding to transcription factors such as PIF3. Coupled with this, the degradation of positively acting intermediates such as the transcription factor HY5 by COPl and the C0P9 signalosome appears to be an important process whereby photomorphogenesis is repressed in darkness. Genetic analyses in Arabidopsis and tomato have revealed that the nuelear protein DETl also plays a key role in the repression of photomorphogenesis. However, up until now the mechanisms underlying its function have remained obscure.
 In this thesis through a series of in vitro experiments, persuasive evidence is provided that DETl binds to non-acetylated amino-terminal tails of the core histone H2B in the context of the nucleosome. Furthermore, FRET imaging with GFP variants has been used to prove this interaction within the nucleus of living plant cells. DETl is therefore a novel chromatin interacting protein which binds to nucleosomes via interaction with unmodified H2B tails. Given the dramatic photomorphogenic phenotypes of detl mutants, this result infers that chromatin remodelling plays a heretofore unsuspected role in regulating gene expression during photomorphogenesis.
 An important part of this thesis was devoted to the establishment of a reliable FRET-based wide-field microscopy system for the detection of the interactions between GFP- (Green Fluorescent Protein) tagged proteins in living cells. Limits of some of the available techniques are shown together with many data proving that the established system is indeed able to reliably detect protein-protein interactions.
 Moreover, given the emerging importance of ehromatin remodelling in plants, the FRET-based microscopy system has been used with a histone-based eonstruet in an attempt to reveal chromatin dynamics in living cells. Data are presented about changes of chromatin structures, as detected by FRET measurements, occurring during the cell cycle of living BY-2 cells.
KWALITEIT VAN OORDEEL EN DIE VERWAGTINGS VAN LANDBOU- ONDERNEIVIERS BY BESLUITNEMING
Quality of judgement and the expectations of agricultural entrepreneurs in decision making
Creators: name: Lombard, J. P.
name: Kassier, W. E.
name: Lombard, J. P.
name: Kassier, W. E.
Publisher: name: Unknown
Year: 1993
Subjects: Farm Management
Risk and Uncertainty

description: One of the criteria in evaluating a successful entrepreneur could be the extent to which anticipated expectations actually realises in performance. The expectations of decision makers are, apart from experience and knowledge, influenced by the quality of judgement. The perceptions of agricultural entrepreneurs on the various sources of uncertainty were investigated in the Wiens and Swartland (Southern and Western Cape). The expectations on product prices and yields of this sample of decision makers were observed and compared on two occasions. The heuristic of availability could be responsible for the relatively narrow probability distributions for the price of wheat, while some respondents showed bias in the form of conservatism.
ENTREPRENEURSHIP: THE MISSING LINK TO SUCCESSFUL COOPERATIVISM?
Creators: name: Kirsten, Marie
name: Kirsten, Marie
Publisher: name: Unknown
Year: 1993
Subjects: Agricultural and Food Policy
Institutional and Behavioral Economics

description: Community based co-operatives do not have a good record. The fact that so many co-operatives fail, constitutes a real danger that the co-operative model could fall into such disrepute that it will become widely rejected. Consequently a potentially valuable mechanism for economic development and reconstruction will be lost. One of the reasons for cooperative failure stems from the past perception of co-operatives as anti-capitalist forms of association. Co-operatives were a way of releasing the poor from the yoke of oppression and giving them access to power and employment. This "socialist" view of co-operatives excluded the one important ingredient of a successful business venture: entrepreneurship. The paper investigates the "co-operative entrepreneurship" dilemma, and indicates that entrepreneurship and co-operativism are reconcilable concepts. The circumstances for a successful entrepreneur: co-operative relationship are discussed, and other critical factors associated with success in community based co-operatives are discussed.
The Structure of Molten FLiNaK
Creators: name: Frandsen, Benjamin A.
name: Nickerson, Stella D.
name: Clark, Austin D.
name: Solano, Andrew
name: Baral, Raju
name: Williams, Johnny
name: Neuefeind, Jörg
name: Memmott, Matthew
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The structure of the molten salt (LiF)$_{0.465}$(NaF)$_{0.115}$(KF)$_{0.42}$ (FLiNaK), a potential coolant for molten salt nuclear reactors, has been studied by ab initio molecular dynamics simulations and neutron total scattering experiments. We find that the salt retains well-defined short-range structural correlations out to approximately 9 Angstroms at typical reactor operating temperatures. The experimentally determined pair distribution function can be described with quantitative accuracy by the molecular dynamics simulations. These results indicate that the essential ionic interactions are properly captured by the simulations, providing a launching point for future studies of FLiNaK and other molten salts for nuclear reactor applications.
MULTI-KRITERIA BESLUITONDERSTEUNINGSMODELLE: 'N HULPMIDDEL VIR STRATEGIESE BEPLANNING DEUR ENTREPRENEURS IN 'N VERANDERENDE LANDBOU-OMGEWING
Creators: name: Coetzee, K.
name: Heckroodt, J.
name: Janse Van Rensburg, J. J.
name: Viljoen, M. F.
name: Coetzee, K.
name: Heckroodt, J.
name: Janse Van Rensburg, J. J.
name: Viljoen, M. F.
Publisher: name: Unknown
Year: 1993
Subjects: Agricultural and Food Policy
Farm Management

description: The usefulness of a planning technique depends to a large extent on it's ability to take account of the multiple aims of the farmer and his family. Although linear programming (LP) is a very usefull planning technique its ability to account for multiple aims is fairly limited. This paper compares the result obtained from LP with that from goal and multiple objective programming for a case study in the Petrusburg magisterial district.
Al Qaeda and the Islamic State's break : strategic strife or lackluster leadership?
Creators: name: Bacon, Tricia
name: Arsenault, Elizabeth Grimm
Publisher: name: American University
Year: 2023

description: Employing counterfactuals to assess individual and systemic explanations for the split between Al Qaeda and the Islamic State of Iraq and al-Sham (ISIS), this article concludes that individual leaders factor greatly into terrorist alliance outcomes. Osama bin Laden was instrumental in keeping Al Qaeda and ISIS allied as he prioritized unity and handled internal disputes more deftly than his successor, Dr. Ayman al-Zawahiri. Although a troubled alliance, strategic differences between Al Qaeda and ISIS were not sufficient to cause the split. Rather, the capabilities of Al Qaeda's leader determined the group's ability to prevent alliance ruptures.
Quivers with relations arising from clusters (A_n case)
Creators: name: Caldero, Philippe
name: Chapoton, Frederic
name: Schiffler, Ralf
Publisher: name: arXiv
Year: 2004
Subjects: subject: Representation Theory (math.RT)
subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 16G20, 16G70, 05E15, 20F55

description: Cluster algebras were introduced by S. Fomin and A. Zelevinsky in connection with dual canonical bases. Let U be a cluster algebra of type A_n. We associate to each cluster C of U an abelian category Cat_C such that the indecomposable objects of Cat_C are in natural correspondence with the cluster variables of U which are not in C. We give an algebraic realization and a geometric realization of Cat_C. Then, we generalize the ``denominator Theorem'' of Fomin and Zelevinsky to any cluster.
description: 18 pages, 6 figures
Haemaphysalis juxtakochi
Creators: name: Basu, A. K.
name: Basu, M.
name: Adesiyun, A. A.
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Ixodida
Ixodidae
Haemaphysalis
Haemaphysalis juxtakochi

description: Haemaphysalis juxtakochi
 Kohls (1960) first recorded the identity of H. juxtakochi, collected by T.H.G. Aitken on 24 June 1954 from Cumaca, Trinidad. This tick parasitizes deer (Mazama rufa) and paca (Coelogenys paca). Keirans (1982) also recorded this tick from Caparo, Trinidad.
 Distribution: ranges from USA to northern Argentina (Guglielmone et al. 2003)
description: Published as part of Basu, A. K., Basu, M. & Adesiyun, A. A., 2012, A Review On Ticks (Acari: Ixodoidea: Ixodidae, Argasidae), Associated Pathogens And Diseases Of Trinidad And Tobago, pp. 39-50 in Acarologia 52 (1) on page 45, DOI: 10.1051/acarologia/20122034, http://zenodo.org/record/4667077
ENTREPRENEURSHIP AND THE BOTTOM LINE: HOW MUCH OF AGRICULTURE'S PROFITS IS DUE TO CHANGES IN PRICE, HOW MUCH TO PRODUCTIVITY?
Creators: name: Van Zyl, J.
name: Van Schalkwyk, H. D.
name: Thirtle, C.
name: Van Zyl, J.
name: Van Schalkwyk, H. D.
name: Thirtle, C.
Publisher: name: Unknown
Year: 1993
Subjects: Agricultural and Food Policy
Demand and Price Analysis

description: Conventional financial analysis shows that profit comes from the difference between revenues and costs. A sector can generate profit growth through productivity growth or price over-recovery, or both. The course that is taken, however, has important implications for its longer-term competitive positioning. The South African agricultural sector showed a steady decline in its performance since 1973. The decline is attributed to the cost-price squeeze; increases in productivity did not compensate for decreases in price recovery. The decline reached its lowest in 1983 when the growth in productivity overtook the negative effect of the terms of trade.