cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Discrete Signal Processing on Meet/Join Lattices
Creators: name: Püschel, Markus
name: Seifert, Bastian
name: Wendler, Chris
Publisher: name: arXiv
Year: 2020
Subjects: subject: Information Theory (cs.IT)
subject: Social and Information Networks (cs.SI)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: A lattice is a partially ordered set supporting a meet (or join) operation that returns the largest lower bound (smallest upper bound) of two elements. Just like graphs, lattices are a fundamental structure that occurs across domains including social data analysis, natural language processing, computational chemistry and biology, and database theory. In this paper we introduce discrete-lattice signal processing (DLSP), an SP framework for data, or signals, indexed by such lattices. We use the meet (or join) to define a shift operation and derive associated notions of filtering, Fourier basis and transform, and frequency response. We show that the spectrum of a lattice signal inherits the lattice structure of the signal domain and derive a sampling theorem. Finally, we show two prototypical applications: spectral analysis of formal concept lattices in social science and sampling and Wiener filtering of multiset lattices in combinatorial auctions. Formal concept lattices are a compressed representation of relations between objects and attributes. Since relations are equivalent to bipartite graphs and hypergraphs, DLSP offers a form of Fourier analysis for these structures.
description: 13 pages
Mitigating Risks: Enhancing Occupational Health & Safety Through Quality Management
Creators: name: Harisan Ravindran
Publisher: name: Zenodo
Year: 2024

description: This paper explores the synergistic relationship between quality management and Occupational Health and Safety (OHS) in contemporary workplaces. Through an in-depth analysis, it elucidates the pervasive nature of workplace hazards, the ramifications of poor quality management on exacerbating these risks, and a structured framework for integrating effective quality practices into OHS. The study emphasizes proactive measures for risk mitigation, stakeholder roles in fostering a safety-oriented culture, and the imperative of continuous improvement and adaptation in the face of evolving standards. The paper concludes by envisioning a future propelled by innovation, collaboration, and unwavering commitment to employee well-being.
THE IMPACT OF IMPROVED MAIZE GERMPLASM ON POVERTY ALLEVIATION: THE CASE OF TUXPENO-DERIVED MATERIAL IN MEXICO
Creators: name: Bellon, Mauricio R.
name: Adato, Michelle
name: Becerril, Javier
name: Mindek, Dubravka
name: Bellon, Mauricio R.
name: Adato, Michelle
name: Becerril, Javier
name: Mindek, Dubravka
Publisher: name: Unknown
Year: 2003
Subjects: subject: Crop Production/Industries
subject: Food Security and Poverty
subject: Poverty
subject: Agricultural research
subject: Sustainable livelihoods
subject: Vulnerability
subject: Agricultural extension
subject: Maize germplasm
subject: Creolization
subject: Mexico

description: This study documents how poor small-scale farmers in lowland tropical Mexico use improved maize germplasm and how this contributes to their well-being. It does this by assessing both the direct adoption of improved varieties and examining the process of their “creolization.” By exposing improved varieties for replanting, and in some cases promoting their hybridization with landraces, either by design or by accident, farmers produce what they recognize as “creolized” varieties. Our key hypothesis is that poor farmers benefit from improved germplasm through creolization. Creolization provides farmers with new options, as they deliberately modify an improved technology generated by the formal research system to suit their own circumstances and needs. Different methodologies such as participatory methods, ethnography, household case studies, a household sample survey, and a collection and agronomic evaluation of maize samples were used. This study was carried out in two regions: the coast of Oaxaca and the Frailesca in the states of Oaxaxa and Chiapas, two of the poorest in Mexico. While one study area is subsistence-oriented and the other commercial, in both, extreme poverty is pervasive. Maize continues to play a key role in the livelihoods of the poor in both study areas. The results show that different types of maize germplasm are planted. Modern varieties, and particularly creolized varieties, are planted in both study areas. The impacts of the use of improved maize germplasm are defined and analyzed in terms of the extent to which they supply farmers with traits they consider important and the trade-offs they entail. The results support the hypothesis, and the implications of the findings are discussed.
Rauscher, Anton (Hrsg.), Entwicklungslinien des deutschen Katholizismus
Creators: name: Boeckler, Richard
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 22 Nr. 3 (1973): Ökumenische Rundschau, Band 22, Heft 3
Advanced One Year Diploma in Biotechnological Sciences HighSchool from 2024-2025 & Transfer Certificate Character Certificate & Migration Certificate Details Amit Biosciences and Bionanotechnology & Biogeosciences An Autonomous Non Profit Non Employed Non Government Non Sharing Research & Development Solely of Amit Rastogi
Creators: name: Amit Rastogi, Amit Rastogi
Publisher: name: Zenodo
Year: 2024

description: Here in The Research Review Paper Transfer Certificate Character Certificate & Migration Certificate Details is Provided. Also Advanced One Year Diploma in Biotechnological Sciences High School from 2024-2025 is Discussed in Research Review Paper. Also here Biogeosciences  Certify Amit Rastogi is 13 Years at 2024 by Amit Rastogi, Research Scientist cum Research Assistant Professor cum Senior Director Research cum Chief Operating Officer cum Director Executive cum Science Research Theory Explain Researcher cum Dame Research Assistant Professor cum Multidisclipinary Science Literature Survayed Senior Scientist Q.
From perfect to fractal transmission in spin chains
Creators: name: De Chiara, Gabriele
name: Rossini, Davide
name: Montangero, Simone
name: Fazio, Rosario
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Physics (quant-ph)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Perfect state transfer is possible in modulated spin chains, imperfections however are likely to corrupt the state transfer. We study the robustness of this quantum communication protocol in the presence of disorder both in the exchange couplings between the spins and in the local magnetic field. The degradation of the fidelity can be suitably expressed, as a function of the level of imperfection and the length of the chain, in a scaling form. In addition the time signal of fidelity becomes fractal. We further characterize the state transfer by analyzing the spectral properties of the Hamiltonian of the spin chain.
description: 8 pages, 10 figures, published version
On the Determination of the Rotational Oblateness of Achernar
Creators: name: Carciofi, A. C.
name: de Souza, A. Domiciano
name: Magalhaes, A. M.
name: Bjorkman, J. E.
name: Vakili, F.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The recent interferometric study of Achernar, leading to the conclusion that its geometrical oblateness cannot be explained in the Roche approximation, has stirred substantial interest in the community, in view of its potential impact in many fields of stellar astrophysics. It is the purpose of this paper to reinterpret the interferometric observations with a fast rotating, gravity darkened central star surrounded by a small equatorial disk, whose presence is consistent with contemporaneous spectroscopic data. We find that we can only fit the available data assuming a critically rotating central star. We identified two different disk models that simultaneously fit the spectroscopic, polarimetric, and interferometric observational constraints: a tenuous disk in hydrostatic equilibrium (i.e., with small scaleheight) and a smaller, scaleheight enhanced disk. We believe that these relatively small disks correspond to the transition region between the photosphere and the circumstellar environment, and that they are probably perturbed by some photospheric mechanism. The study of this interface between photosphere and circumstellar disk for near-critical rotators is crucial to our understanding of the Be phenomenon, and the mass and angular momentum loss of stars in general. This work shows that it is nowadays possible to directly study this transition region from simultaneous multi-technique observations.
description: 4 pages, 2 figures. Accepted to ApJ Letters
The impacts of forest harvest on the persistence and colonisation potential of pacific giant salamanders (dicamptodon tenebrosus) in British Columbia
Creators: name: Curtis, Janelle Marie
Publisher: name: University of British Columbia
Year: 2009

description: The Pacific Giant Salamander {Dicamptodon tenebrosus) is considered vulnerable to local extirpation from British Columbia by the Committee on the Status of Endangered Wildlife in Canada (COSEWIC) and is red-listed by the BC Ministry of the Environment, Lands and Parks. The impacts of forest practices potentially threaten the long-term persistence of Pacific Giant Salamanders in Canada. I used microsatellite and AFLP markers to indirectly assess the impacts of forest harvesting on the population structure and colonisation potential of Pacific Giant Salamanders. Levels of genetic variation and population differentiation were compared among eight sub-populations in three coastal forest types (old-growth, secondgrowth and clear-cut) in the Chilliwack River Valley, British Columbia, and other populations across D. tenebrosus' biogeographic range. Patterns of genetic variation and heterozygosity revealed that populations at the northern extent of D. tenebrosus' range have lower allelic richness and heterozygosity than more central and southern populations. Comparisons of genetic variation among forest types in BC revealed that recently clear-cut sites have less genetic variation than secondgrowth and old-growth sites, suggesting that clear-cutting may cause genetic bottlenecks. The level of genetic variation (allelic richness and percent polymorphic loci) and heterozygosity were significantly correlated with stand age. There was no relationship between geographic distance and genetic differentiation within the Chilliwack Valley. Analyses of molecular variance (AMOVA) and estimates of population structure Fst and Φst, confirmed that there was slight to moderate differentiation among sub-populations of D. tenebrosus in BC. The colonisation potential of Pacific Giant Salamanders appears to be sufficient to re-establish locally extirpated sub-populations or to recover lost genetic variation from surrounding streams, particularly among clustered streams within drainages. However, long-term studies are required to assess whether the recovery of sub-populations is occurring faster than they are being disturbed, and whether Pacific Giant Salamanders are numerically stable in BC, or whether they are in decline. [Scientific formulae used in this abstract could not be reproduced.]
Stripes, Antiferromagnetism, and the Pseudogap in the Doped Hubbard Model at Finite Temperature
Creators: name: Wietek, Alexander
name: He, Yuan-Yao
name: White, Steven R.
name: Georges, Antoine
name: Stoudenmire, E. Miles
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The interplay between thermal and quantum fluctuations controls the competition between phases of matter in strongly correlated electron systems. We study finite-temperature properties of the strongly coupled two-dimensional doped Hubbard model using the minimally-entangled typical thermal states (METTS) method on width $4$ cylinders. We discover that a phase characterized by commensurate short-range antiferromagnetic correlations and no charge ordering occurs at temperatures above the half-filled stripe phase extending to zero temperature. The transition from the antiferromagnetic phase to the stripe phase takes place at temperature $T/t \approx 0.05$ and is accompanied by a step-like feature of the specific heat. We find the single-particle gap to be smallest close to the nodal point at $\mathbf{k}=(π/2, π/2)$ and detect a maximum in the magnetic susceptibility. These features bear a strong resemblance to the pseudogap phase of high-temperature cuprate superconductors. The simulations are verified using a variety of different unbiased numerical methods in the three limiting cases of zero temperature, small lattice sizes, and half-filling. Moreover, we compare to and confirm previous determinantal quantum Monte Carlo results on incommensurate spin-density waves at finite doping and temperature.
description: 18 pages, 16 figures
On the Stability of Phantom K-essence Theories
Creators: name: Abramo, L. Raul
name: Pinto-Neto, Nelson
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We show that phantom dark energy, if it is described by a K-essence theory, has three fundamental problems: first, its hamiltonian is unbounded from below. Second, classical stability precludes the equation of state from crossing the ``Lambda-barrier'', $w_Λ=-1$. Finally, both the equation of state and the sound speed are unbounded -- the first, from below, the second, from above -- if the kinetic term is not bounded by dynamics.
description: Replaced with accepted version (minor changes, 1 reference added). Revtex4, 4 pages (double column), 1 figure
Unitary Cuntz semigroups of ideals and quotients
Creators: name: Cantier, Laurent
Publisher: name: arXiv
Year: 2020
Subjects: subject: Operator Algebras (math.OA)
subject: FOS: Mathematics

description: We define a notion of ideal for objects in the category of abstract unitary Cuntz semigroups introduced in [3] and termed Cu$^\sim$. We show that the set of ideals of a Cu$^\sim$-semigroup has a complete lattice structure. In fact, we prove that for any C$^*$-algebra of stable rank one $A$, the assignment $I\longmapsto$Cu$_1(I)$ defines a complete lattice isomorphism between the set of ideals of $A$ and the set of ideals of its unitary Cuntz semigroup Cu$_1(A)$. Further, we introduce a notion of quotients and exactness for the (non abelian) category Cu$^\sim$. We show that Cu$_1(A)/$Cu$_1(I)\simeq$ Cu$_1(A/I)$ for any ideal $I$ in $A$ and that the functor Cu$_1$ is exact. Finally, we link a Cu$^\sim$-semigroup with the Cu-semigroup of its positive elements and the abelian group of its maximal elements in a split-exact sequence. This result allows us to extract additional information that lies within the unitary Cuntz semigroup of a C$^*$-algebra of stable rank one.
description: 18 pages. To appear in M\"unster J. of Math. (In press)
Low temperature correlation functions in integrable models: Derivation of the large distance and time asymptotics from the form factor expansion
Creators: name: Altshuler, B. L.
name: Konik, R. M.
name: Tsvelik, A. M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We propose an approach to the problem of low but finite temperature dynamical correlation functions in integrable one-dimensional models with a spectral gap. The approach is based on the analysis of the leading singularities of the operator matrix elements and is not model specific. We discuss only models with well defined asymptotic states. For such models the long time, large distance asymptotics of the correlation functions fall into two universality classes. These classes differ primarily by whether the behavior of the two-particle S matrix at low momenta is diagonal or corresponds to pure reflection. We discuss similarities and differences between our results and results obtained by the semi-classical method suggested by Sachdev and Young, Phys. Rev. Lett. {\bf 78}, 2220 (1997).
description: 21 pages, 3 figures. The final version to appear in Nucl.Phys. B
CONDITIONAL CASH TRANSFERS AND THEIR IMPACT ON CHILD WORK AND SCHOOLING: EVIDENCE FROM THE PROGRESA PROGRAM IN MEXICO
Creators: name: Skoufias, Emmanuel
name: Parker, Susan W.
name: Skoufias, Emmanuel
name: Parker, Susan W.
Publisher: name: Unknown
Year: 2001
Subjects: Food Security and Poverty
Labor and Human Capital

description: The worsening degradation of natural resources urgently requires the adoption of more sustainable management practices. This need has led to growing interest and investment in monitoring systems for tracking the condition of natural resources. Although grounded in concepts of sustainability, the application of monitoring systems has progressed little beyond the identification and measurement of large numbers of potentially interesting indicators. Most monitoring activities are also passive and do not lead to the changes needed to rectify the problems they identify. Too often monitoring becomes an end in itself and an expensive claim on public funds. This study is concerned with the design of monitoring systems that have direct relevance for the management of natural resources. We call these Policy Relevant Monitoring Systems (PRMS). Such systems have several key characteristics. They provide: a) a decision framework for selecting resource problems to monitor that offer potentially large social payoffs relative to the costs of monitoring, b) timely, including early warning information on emerging problems, c) a means of identifying the causes of an emerging problem, d) an analytical framework for identifying options for corrective action, e) an institutional framework for achieving ownership among key stakeholders (the resource users and those affected by the resource use) and agreement about emerging problems, the corrective actions to take, and effective implementation, and f) a built-in mechanism for learning from past experience to improve the performance of the monitoring system over time. The design and implementation of a PRMS is complicated in reality by the presence of multiple resource users with often conflicting interests, and by the presence of environmental externalities. The approach is developed and illustrated through detailed examination of the Arenal-Tempisque watershed in Costa Rica. This watershed exhibits classic multiple user and externality problems: deforestation by dairy and cattle farmers in the upper watershed leads to soil erosion and siltation of the various reservoirs that feed an important hydro-electric power generation system, and agro-chemical use by irrigated farmers has adverse impacts on a highly valued wetlands park and on wildlife and fishing in the lower reaches of the watershed.
Disease extinction in the presence of non-Gaussian noise
Creators: name: Dykman, Mark
name: Schwartz, Ira B.
name: Landsman, Alexandra S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Populations and Evolution (q-bio.PE)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: We investigate stochastic extinction in an epidemic model and the impact of random vaccinations in large populations. We show that, in the absence of vaccinations, the effective entropic barrier for extinction displays scaling with the distance to the bifurcation point, with an unusual critical exponent. Even a comparatively weak Poisson-distributed vaccination leads to an exponential increase in the extinction rate, with the exponent that strongly depends on the vaccination parameters.
description: Accepted for publication to PRL
Charge gaps and quasiparticle bands of the ionic Hubbard model
Creators: name: Jabben, Torben
name: Grewe, Norbert
name: Anders, Frithjof
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The ionic Hubbard model on a cubic lattice is investigated using analytical approximations and Wilson's renormalization group for the charge excitation spectrum. Near the Mott insulating regime, where the Hubbard repulsion starts to dominate all energies, the formation of correlated bands is described. The corresponding partial spectral weights and local densities of states show characteristic features, which compare well with a hybridized-band picture appropriate for the regime at small $U$, which at half-filling is known as a band insulator. In particular, a narrow charge gap is obtained at half-filling, and the distribution of spectral quasi-particle weight reflects the fundamental hybridization mechanism of the model.
Metal-insulator transition in transition metal dichalcogenide heterobilayer moiré superlattices
Creators: name: Morales-Durán, Nicolás
name: Potasz, Pawel
name: MacDonald, Allan H.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Moiré superlattices formed in two-dimensional semiconductor heterobilayers provide a new realization of Hubbard model physics in which the number of electrons per effective atom can be tuned at will. We report on an exact diagonalization study of the electronic properties of half-filled narrow moiré bands in which correlation strengths are varied by changing twist angles or interaction strengths. We construct a phase diagram for the bilayer, identifying where the metal-insulator phase transition occurs, estimating the sizes of the charge gaps in the insulating phase, and commenting on the nature of the transition and the importance of sub-dominant interaction parameters.
description: 7 pages, 6 figures
XALQARO TASHISHNING MUHIM TURI HISOBLANGAN AVTOMOBILLARDA YUK TASHISH TURLARI VA SHARTLARI
Creators: name: Bahodirova, Sitora
Publisher: name: Zenodo
Year: 2024

description: Yuklarni avtomobilda tashish yuk tashish bilan bog‘liq bo‘lgan yuk bilan va yuksiz yuk tashish vositalarini o‘z ichiga oladi. Xalqaro ko‘lamda  avtomobilda yuk tashish – yuklarni kamida bitta davlat chegarasidan o‘tuvchi avtomobil qatnovi bo‘lib, bunda ikki tomonlama transport, tranzit va uchinchi davlatlar o‘rtasidagi tashishlar farqlanadi.
Kiaeroceras undefined-D
Creators: name: Kröger, Björn
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Cephalopoda
Cyrtogomphoceratidae
Kiaeroceras
Kiaeroceras undefined-D

description: Kiaeroceras sp. D
Fig. 40B, E
Material examined
ESTONIA • 1 spec.; Kärdla quarry; Kõrgessaare Formation, Vormsi Regional Stage; TUG 1745-201.
Description
The specimen is a fragment of a very slightly endogastrically curved mature body chamber with conch height, and width at its base of 61 mm and 49 mm, respectively (CHI = 1.44). The preserved part of the body chamber is 65 mm long and tubular in lateral view. The conch cross section is oval with a narrower prosiphuncular side. The siphuncle is close to the conch margin and ca 7 mm wide (RSH = 0.11).
Remarks
In its dimensions, this specimen is most similar to the Norwegian species of Kiaeroceras but differs in having a more compressed conch (K. frognoyense has a CHI of 1.15, and K. heroyense a CHI of 1.25).
description: Published as part of Kröger, Björn, 2025, The Lyckholm acme of cephalopods - Review of the late Katian (Vormsi-Pirgu regional stages) Ordovician cephalopods of Estonia, pp. 1-169 in European Journal of Taxonomy 978 on page 112, DOI: 10.5852/ejt.2025.978.2801, http://zenodo.org/record/14988376
A MULTIPLE-METHOD APPROACH TO STUDYING CHILDCARE IN AN URBAN ENVIRONMENT: THE CASE OF ACCRA, GHANA
Creators: name: Ruel, Marie T.
name: Armar-Klemesu, Margaret
name: Arimond, Mary
name: Ruel, Marie T.
name: Armar-Klemesu, Margaret
name: Arimond, Mary
Publisher: name: Unknown
Year: 2001
Subjects: Labor and Human Capital

description: This document summarizes findings from the Accra Urban Food and Nutrition Study (AUFNS) about the importance of care as an input to child nutrition and the relative contribution of various maternal and household resources to the provision of care. Findings from the quantitative survey (n = 556) and the in-depth observational study (n = 22) are reviewed and complemented with insights from the participatory rapid appraisals (PRAs) carried out at the onset of the study. Results of each phase of the research have been reported separately; this report aims to integrate findings from all three components. The key findings related to the five main questions addressed by this study are summarized as follows. ! Is care an important input into child nutrition in Accra? The Accra study provides unequivocal evidence of the critical role of childcare practices as a key input into children’s nutritional status. ! Which care practices seem to be most crucial for child nutrition? Findings from the observational study confirmed the suggestion from the quantitative survey that optimal feeding practices during the first 6 months of life contribute to the prevention of growth failure among young infants in Accra and that the benefits may linger beyond the first year of life. ! Which maternal and household resources contribute the most to enhancing care in Accra? Maternal education was the characteristic most strongly associated with good childcare practices. For the majority of women, employment did not seem to be a severe constraint for childcare and nutrition in this context. However, maternal early return to work after delivery—usually a response to economic constraints—may entail risks for children. ! What are the program and policy responses to promote optimal childcare practices in this urban context? Our findings support the universal consensus on the importance of investing in girls’ education. In the short term, effective nutrition education and behavior change strategies can simulate some of the benefits of formal education. Support for workingwomen in the form of low-cost, community-based childcare facilities should also be given priority, as well as policies to address poverty alleviation, income generation, hygiene and sanitation, and quality control of street food sales. ! How do the three research approaches used for the measurement of childcare complement each other? Each method provided unique information and also enriched and informed interpretation of other study components. The “triangulation” of findings also helped generate additional hypotheses that could be tested using an iterative process of analysis. This allowed for obtaining a richer and more complete picture of the role of care as an input into child nutrition in Accra.
The meaning of group delay in barrier tunneling: A re-examination of superluminal group velocities
Creators: name: Winful, Herbert G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We show that the group delay in tunneling is not a traversal time but a lifetime of stored energy or stored probability escaping through both ends of the barrier. Because it is a lifetime associated with both forward (transmitted) and backward (reflected) fluxes, it cannot be used to define a group velocity for forward transit in cases where a wavepacket is mostly reflected. For photonic tunneling barriers the group delay is identical to the dwell time which is also a property of an entire wave function with reflected and transmitted components. Theoretical predictions and experimental reports of superluminal group velocities in barrier tunneling are re-interpreted.
description: 33 pages, 4 figures
A unitary Cuntz semigroup for C*-algebras of stable rank one
Creators: name: Cantier, Laurent
Publisher: name: arXiv
Year: 2020
Subjects: subject: Operator Algebras (math.OA)
subject: FOS: Mathematics

description: We introduce a new invariant for C*-algebras of stable rank one that merges the Cuntz semigroup information together with the K$_1$-group information. This semigroup, termed the Cu$_1$-semigroup, is constructed as equivalence classes of pairs consisting of a positive element in the stabilization of the given C*-algebra together with a unitary element of the unitization of the hereditary subalgebra generated by the given positive element. We show that the Cu$_1$-semigroup is a well-defined continuous functor from the category of C*-algebras of stable rank one to a suitable codomain category that we write Cu$^\sim$. Furthermore, we compute the Cu$_1$-semigroup of some specific classes of C*-algebras. Finally, in the course of our investigation, we show that we can recover functorially Cu, K$_1$ and K$_*:=$K$_0$$\oplus$ K$_1$ from Cu$_1$.
description: 30 pages. To appear in J. Funct. Anal. (In press)
DIETARY DIVERSITY AS A FOOD SECURITY INDICATOR
Creators: name: Hoddinott, John
name: Yohannes, Yisehac
name: Hoddinott, John
name: Yohannes, Yisehac
Publisher: name: Unknown
Year: 2002
Subjects: Food Security and Poverty

description: Household food security is an important measure of well-being. Although it may not encapsulate all dimensions of poverty, the inability of households to obtain access to enough food for an active, healthy life is surely an important component of their poverty. Accordingly, devising an appropriate measure of food security outcomes is useful in order to identify the food insecure, assess the severity of their food shortfall, characterize the nature of their insecurity (for example, seasonal versus chronic), predict who is most at risk of future hunger, monitor changes in circumstances, and assess the impact of interventions. However, obtaining detailed data on food security status—such as 24-hour recall data on caloric intakes—can be time consuming and expensive and require a high level of technical skill both in data collection and analysis. This paper examines whether an alternative indicator, dietary diversity, defined as the number of unique foods consumed over a given period of time, provides information on household food security. It draws on data from 10 countries (India, the Philippines, Mozambique, Mexico, Bangladesh, Egypt, Mali, Malawi, Ghana, and Kenya) that encompass both poor and middle-income countries, rural and urban sectors, data collected in different seasons, and data on calories acquisition obtained using two different methods. The paper uses linear regression techniques to investigate the magnitude of the association between dietary diversity and food security. An appendix compiles the results of using methods such as correlation coefficients, contingency tables, and receiver operator curves. We find that a 1 percent increase in dietary diversity is associated with a 1 percent increase in per capita consumption, a 0.7 percent increase in total per capita caloric availability, a 0.5 percent increase in household per capita daily caloric availability from staples, and a 1.4 percent increase in household per capita daily caloric availability from nonstaples. These associations, which are found in both rural and urban areas and across seasons, do not depend on the method used to assess these associations, nor when using the number of unique food groups consumed is the measure of dietary diversity. There is an association between dietary diversity and food access at the individual level, although the magnitude of this association is considerably weaker than that between dietary diversity and food access. Looking across all samples, the magnitude of the association between dietary diversity and caloric availability at the household level increases with the mean level of caloric availability. Accordingly, dietary diversity would appear to show promise as a means of measuring food security and monitoring changes and impact, particularly when resources available for such measurement are scarce.
The Dirac equation in Taub-NUT space
Creators: name: Comtet, A.
name: Horvathy, P. A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Using chiral supersymmetry, we show that the massless Dirac equation in the Taub-NUT gravitational instanton field is exactly soluble and explain the arisal and the use of the dynamical (super) symmetry.
description: An importatn misprint in a reference is corrected. Plain Tex. 8 pages
Parity and time-reversal elucidate both decision-making in empirical models and attractor scaling in critical Boolean networks
Creators: name: Rozum, Jordan C.
name: Zañudo, Jorge Gómez Tejeda
name: Gan, Xiao
name: Deritei, Dávid
name: Albert, Réka
Publisher: name: arXiv
Year: 2020
Subjects: subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Physical sciences

description: We present new applications of parity inversion and time-reversal to the emergence of complex behavior from simple dynamical rules in stochastic discrete models. Our parity-based encoding of causal relationships and time-reversal construction efficiently reveal discrete analogs of stable and unstable manifolds. We demonstrate their predictive power by studying decision-making in systems biology and statistical physics models. These applications underpin a novel attractor identification algorithm implemented for Boolean networks under stochastic dynamics. Its speed enables resolving a longstanding open question of how attractor count in critical random Boolean networks scales with network size, and whether the scaling matches biological observations. Via 80-fold improvement in probed network size ($N=16,384$), we find the surprisingly low scaling exponent of $0.12\pm 0.05$ -- approximately one tenth the analytical upper bound. We demonstrate a general principle: a system's relationship to its time-reversal and state-space inversion constrains its repertoire of emergent behaviors.
description: The IPython Notebook referenced in supplemental information, along with other reproduction materials, is available at https://github.com/jcrozum/StableMotifs/tree/master/Random%20Boolean%20Network%20Application
IS CSR JUST A MATTER OF RESOURCES?
Creators: name: Battistini, Claudio
name: Gazzola, Patrizia
Publisher: name: Economia Aziendale Online
Year: 2015
Subjects: Corporate Social Responsibility, Globalization, Communication, Strategy, SME

description: The entire process of Globalization is more and more considered as an opportunity for corporations to growth and exploit resources, knowledge and new markets worldwide. However managers and corporations are often under pressures from institutions and public opinion due to their irresponsible behavior, especially in less developed countries, which many authors described as “a global race to the bottom”, referring to the inability of creating long term entrepreneurial projects and sustainable development a global level preferring short term orientation and profit maximization. But, what are the reasons of such awareness beyond enterprises’ activity? Why is it important to understand their behavior in less developed countries as a key aspect for achieving a sustainable developed model? Are only the multinational corporations, able to dedicate resources and investments to CSR activities, responsible of such sustainable development model creation? This paper present a literature review about the relation of globalization and corporate social responsibility, trying to achieve conclusions in the field of a) the relations among firms’ dimensions and resources available to be dedicated to CSR activities and b) correlation among firms’ dimensions and the steady of evolution of CSR activity performed. We will therefore present an integration of two important model recognized in the international literature to show the steps in the CSR activities that lead firms to structures themselves and create a constant dialogue with stakeholders.
description: Economia Aziendale Online, Vol 6, No 2 (2015): Issue 2/2015
A universal description for the freezeout parameters in heavy-ion collisions
Creators: name: Tawfik, A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: It is shown that the freezeout parameters estimated in the heavy-ion collisions all are well described by a constant value of the entropy density $s$ divided by $T^3$. The value of $s/T^3$ has been taken from the lattice QCD simulations at zero baryo-chemical potential $μ_B$ and assumed to remain constant for finite $μ_B$. This implies that the hadronic matter in rest frame of produced system can be determined by constant degrees of freedom. Furthermore, this condition has been used to predict the freezeout parameters at low temperatures.
description: 7 pages, 2 eps figures, submitted to Nucl. Phys. A
Analysis of Cryptocurrency Transactions from a Network Perspective: An Overview
Creators: name: Wu, Jiajing
name: Liu, Jieli
name: Zhao, Yijing
name: Zheng, Zibin
Publisher: name: arXiv
Year: 2020
Subjects: subject: Social and Information Networks (cs.SI)
subject: FOS: Computer and information sciences

description: As one of the most important and famous applications of blockchain technology, cryptocurrency has attracted extensive attention recently. Empowered by blockchain technology, all the transaction records of cryptocurrencies are irreversible and recorded in the blocks. These transaction records containing rich information and complete traces of financial activities are publicly accessible, thus providing researchers with unprecedented opportunities for data mining and knowledge discovery in this area. Networks are a general language for describing interacting systems in the real world, and a considerable part of existing work on cryptocurrency transactions is studied from a network perspective. This survey aims to analyze and summarize the existing literature on analyzing and understanding cryptocurrency transactions from a network perspective. Aiming to provide a systematic guideline for researchers and engineers, we present the background information of cryptocurrency transaction network analysis and review existing research in terms of three aspects, i.e., network modeling, network profiling, and network-based detection. For each aspect, we introduce the research issues, summarize the methods, and discuss the results and findings given in the literature. Furthermore, we present the main challenges and several future directions in this area.
La qualità della remuneration disclosure nelle imprese quotate italiane
Creators: name: Leopizzi, Rossella
name: Dammacco, Giuseppe
Publisher: name: ----
Year: 2015
Subjects: remuneration disclosure, qualità informativa, relazione remunerazione, compensi amministratori

description: Il presente studio analizza la qualità dell’informativa presente nel documento “Relazione sulla remunerazione” delle imprese quotate presso Borsa Italiana nel segmento STAR . L'obiettivo del presente lavoro è sviluppato su tre livelli di analisi: valutare la qualità della disclosure della Relazione sulla remunerazione per gli anni  2011(first adoption) e 2012; valutare il grado di coerenza tra quanto dichiarato nel 2011 in termini di politica remunerativa prospettica (per il 2012) e quanto rendicontato nel 2012; verificare se e quali elementi di corporate governance sono in grado di influenzare la qualità della remuneration disclosure . In merito al primo obiettivo, i risultati evidenziano un livello complessivo medio di compliance che si attesta intorno al 60% dato di per sé  non soddisfacente se si considera che il campione di riferimento è costituito da imprese impegnate a rispettare standard elevati di qualità e trasparenza. I risultati relativi alla coerenza tra politica remunerativa dichiarata e sistema di remunerazione introdotto dalle imprese evidenziano, altresì, risultati non confortanti (più del 70% delle aziende del campione mostra un livello di incoerenza parziale). I risultati riconducibili al terzo obiettivo della ricerca  indicano una correlazione tra il numero di donne nei cda e la frequenza del numero di riunioni dei cda e la  disclosure quality.

The aim of this paper is to assess the disclosure quality in the document called "The Remuneration Report" covering the years 2011 and 2012 for companies listed on the STAR segment of the Italian Stock Exchange. This aim has been developed on three levels: assessing the disclosure quality in the remuneration report in 2011 (which is first application) and in 2012; assessing the consistency between what is declared in 2011 about the remuneration policy for 2012 and what has been really done in 2012; establishing whether and which elements of governance are able to influence the quality of disclosure on remuneration system. About the first point, the results show an overall average level of compliance that is around 60% and, therefore, not exciting, especially considering the sample (companies engaged to respect high standards of quality and transparency). Also the results about the consistency of the remuneration policy with respect to the compensation paid is not satisfactory (more than 70% of the sample companies show partial inconsistency). In relation to the third point, the results show the importance of the number of women in the board and the number of meetings of the board, as determinants of disclosure quality.
description: ----, Vol 6, No 2 (2015): Issue 2/2015
On the Formation of Gas Giant Planets on Wide Orbits
Creators: name: Boss, Alan P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: A new suite of three dimensional radiative, gravitational hydrodynamical models is used to show that gas giant planets are unlikely to form by the disk instability mechanism at distances of ~100 AU to ~200 AU from young stars. A similar result seems to hold for the core accretion mechanism. These results appear to be consistent with the paucity of detections of gas giant planets on wide orbits by infrared imaging surveys, and also imply that if the object orbiting GQ Lupus is a gas giant planet, it most likely did not form at a separation of ~100 AU. Instead, a wide planet around GQ Lup must have undergone a close encounter with a third body that tossed the planet outward to its present distance from its protostar. If it exists, the third body may be detectable by NASA's Space Interferometry Mission.
description: 13 pages, 4 figures. in press, ApJ Letters
An interdisciplinary assessment of tropical small scale fisheries using multivariate statistics
Creators: name: Preikshot, David Ben
Publisher: name: University of British Columbia
Year: 2009

description: Interdisciplinary fisheries information pertaining to sustainability were analysed with the multivariate techniques of multidimensional scaling and cluster analysis to determine how information from outside biology might help augment biological fisheries analyses or warn when more in depth biological assessments might be needed for a fishery. Tropical small-scale fisheries were used as a test model for collecting this data set as a high percentage are subject to overfishing. Defining the nature and causes of overfishing in these fisheries may help in the development of appropriate solutions to maintaining sustainability of associated fisheries, ecosystems, and communities of fishers using these resources. Measuring the sustainability of tropical small-scale fisheries was examined from the perspective of'Malthusian overfishing', that is, overfishing due to populations increasing at a rate beyond the capacity of the resource base to supply. The mechanism of Malthusian overfishing contains three processes; increased populations, increased competition, and increased use of destructive gears. In order to identify fisheries subject to Malthusian overfishing, 54 tropical small scale fisheries were described using sustainability attributes from four fisheries disciplines; biology, economics, sociology, and technology. While information from economics seemed to be disjointed from the biological indicators of sustainability, the sociological and technological results proved complementary to those from biology. The reasons for these different congruencies are discussed. The implication of this work is that non biological information may be helpful to amplify biological warnings of overfishing as well as identify fisheries in need of greater scrutiny.
Strong Anisotropic MHD Turbulence with Cross Helicity
Creators: name: Chandran, Benjamin D. G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: This paper proposes a new phenomenology for strong incompressible MHD turbulence with nonzero cross helicity. This phenomenology is then developed into a quantitative Fokker-Planck model that describes the time evolution of the anisotropic power spectra of the fluctuations propagating parallel and anti-parallel to the background magnetic field. It is found that in steady state the power spectra of the magnetic field and total energy are steeper than a Kolmogorov spectrum and become increasingly steep as C/E increases, where C is the cross helicity and E is the fluctuation energy. Increasing C with fixed E increases the time required for energy to cascade to smaller scales, reduces the cascade power, and increases the anisotropy of the small-scale fluctuations. The implications of these results for the solar wind and solar corona are discussed in some detail.
description: 30 pages, 5 figures, accepted for publication in ApJ
La diffusione e l’utilizzo delle misure di performance dei servizi di assistenza primaria nel S.S.N.
Creators: name: Cifalino', Antonella
name: Vendramini, Emanuele
Publisher: name: ----
Year: 2015
Subjects: performance measurement, performance management, aziende sanitarie, assistenza primaria

description: Il presente lavoro muove dadue ordini di considerazioni. Da un lato, la letteratura evidenzia la rilevanzadei sistemi di performance measuremente management non solo in generale, maanche in sanità e nel settore pubblico. Dall’altro lato, a fronte dellacentralità assunta dall’assistenza primaria, solo pochi studi hanno sinoraanalizzato i sistemi di misurazione delle performance in questa particolaretipologia di servizi. Lo studio intende contribuire a questo gap attraverso unasurvey che ha indagato, in primo luogo, la diffusione delle misure di performancedell’assistenza primaria e, in secondo luogo, gli scopi e le modalità con cuiesse sono utilizzate all’interno delle aziende sanitarie locali del nostroPaese. In estrema sintesi, i risultati evidenziano che, a fronte di una buonadiffusione delle diverse tipologie di misure di performance, economico-finanziaree non, una significativa quota di aziende non le utilizza in maniera frequenteper i diversi scopi e con le varie modalità in cui può ragionevolmente tradursiil loro impiego.
description: ----, Vol 6, No 2 (2015): Issue 2/2015