cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Universality of energy conversion efficiency for optimal tight-coupling heat engines and refrigerators
Creators: name: Sheng, Shiqi
name: Tu, Z. C.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: A unified $χ$-criterion for heat devices (including heat engines and refrigerators) which is defined as the product of the energy conversion efficiency and the heat absorbed per unit time by the working substance [de Tomás \emph{et al} 2012 \textit{Phys. Rev. E} \textbf{85} 010104(R)] is optimized for tight-coupling heat engines and refrigerators operating between two heat baths at temperatures $T_c$ and $T_h(>T_c)$. By taking a new convention on the thermodynamic flux related to the heat transfer between two baths, we find that for a refrigerator tightly and symmetrically coupled with two heat baths, the coefficient of performance (i.e., the energy conversion efficiency of refrigerators) at maximum $χ$ asymptotically approaches to $\sqrt{\varepsilon_C}$ when the relative temperature difference between two heat baths $\varepsilon_C^{-1}\equiv (T_h-T_c)/T_c$ is sufficiently small. Correspondingly, the efficiency at maximum $χ$ (equivalent to maximum power) for a heat engine tightly and symmetrically coupled with two heat baths is proved to be $η_C/2+η_C^2/8$ up to the second order term of $η_C\equiv (T_h-T_c)/T_h$, which reverts to the universal efficiency at maximum power for tight-coupling heat engines operating between two heat baths at small temperature difference in the presence of left-right symmetry [Esposito \emph{et al} 2009 \textit{Phys. Rev. Lett.} \textbf{102} 130602].
description: substantial revision
title: ХVII международная научная конференция «Ономастика Поволжья»
Creators: name: Васильев, Валерий
name: Кодынева, Людмила
Publisher: name: Новгородский государственный университет имени Ярослава Мудрого (НовГУ)
Year: 2019

description: С 17 по 20 сентября 2019 года в Великом Новгороде на базе Гуманитарного института Новгородского государственного университета имени Ярослава Мудрого прошла XVII Международная научная конференция «Ономастика Поволжья». Успешное проведение конференции во многом стало возможным благодаря финансовой поддержке РФФИ, кроме того, финансовую помощь оказал Новгородский университет. Организации мероприятия в НовГУ помогал Волгоградский государственный социально-педагогический университет в лице д. филол. н. проф. В.И.Супруна. Великий Новгород не случайно принимал у себя столь престижный ономастический форум. В НовГУ проводятся многолетние серьёзные исследования по ономастике Русского Северо-Запада, возглавляемые проф. В.Л.Васильевым, а также по внутригородской ономастике Великого Новгорода (данное направление связано с именем проф. Т.В.Шмелёвой). В конференции участвовала большая группа новгородских филологов — преподавателей НовГУ: помимо Васильева и Шмелевой, участниками были А.В.Батулина, Н.Н.Вихрова, Г.Н.Гиржева, В.И.Заика, Т.И.Кошелева, Е.О.Орлова, к ним присоединился историк И.Ю.Анкудинов, научный сотрудник Государственного архива Новгородской области.
Recruiting and retaining service agencies and public health providers in longitudinal studies: Implications for community-engaged implementation research
Creators: name: Pinto, Rogério M.
name: Witte, Susan S.
name: Wall, Melanie M.
name: Filippone, Prema Lynn
Publisher: name: Columbia University
Year: 2019
Subjects: Public health
Community health services--Research
HIV (Viruses)

description: This article addresses a lack of attention in the implementation science literature regarding how to overcome recruitment and retention challenges in longitudinal studies involving large samples of service agencies and health service providers (“providers”). Herein, we provide a case-illustration of procedures that improved recruitment and retention in a longitudinal, mixed-method study—Project Interprofessional Collaboration Implementation—funded by the US National Institute of Mental Health. Project Interprofessional Collaboration Implementation included counselors, program workers, educators, and supervisors. We present a research-engagement model to overcome barriers that included developing a low-burden study, social gatherings to engage stakeholders, protocols to recruit agencies and providers, comprehensive record-keeping, research procedures as incentives to participation, a plan to retain hard-to-reach participants, and strategies for modifying incentives over time. Using our model, we retained 36 agencies over the life of the project. Between baseline (N = 379) and 12-month follow-up (N = 285), we retained 75% of the sample and between the 12- (N = 285) and 24-month follow-ups (N = 256), we retained 90%. For qualitative interviews (between baseline and 12-month follow-up and between 12- and 24-month follow-ups), we retained 100% of the sample (N = 20). We provide a summary of frequency of contacts required to initiate data collection and time required for data collection. The model responded to environmental changes in policy and priorities that would not have been achievable without the expertise of community partners. To recruit and retain large samples longitudinally, researchers must strategically engage community partners. The strategies imbedded in our model can be performed with moderate levels of effort and human resources. Creating opportunities for research partners to participate in all phases of the research cycle is recommended, which can help build research capacity for future research.
Publisher or Partnership? ]u[ Ubiquity + Stockholm University Press - presentation at the 3rd AEUP Conference "Publishing in Nervous Times"
Creators: name: Josserand, Marianne
name: Lenz, Christina
Publisher: name: Zenodo
Year: 2023
Subjects: university press
open access
academic publishing
scholarly communication

description: A presentation by Marianne Josserand and Christina Lenz about the partnership between ]u[ Ubiquity and Stockholm University Press presented at the 3rd AEUP Conference "Publishing in Nervous Times" on 16 May 2023 in Tallinn, Estonia.
A code arithmetic approach for quaternary code designs and its application to (1/64)th-fractions
Creators: name: Phoa, Frederick K. H.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics

description: The study of good nonregular fractional factorial designs has received significant attention over the last two decades. Recent research indicates that designs constructed from quaternary codes (QC) are very promising in this regard. The present paper aims at exploring the fundamental structure and developing a theory to characterize the wordlengths and aliasing indexes for a general $(1/4)^p$th-fraction QC design. Then the theory is applied to (1/64)th-fraction QC designs. Examples are given, indicating that there exist some QC designs that have better design properties, and are thus more cost-efficient, than the regular fractional factorial designs of the same size. In addition, a result about the periodic structure of (1/64)th-fraction QC designs regarding resolution is stated.
description: Published in at http://dx.doi.org/10.1214/12-AOS1069 the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Training in Evidence-Based Practices Increases Likelihood to Integrate Different HIV Prevention Services with Substance-Using Clients
Creators: name: Pinto, Rogério M.
name: Spector, Anya Y.
name: Witte, Susan S.
name: Filippone, Prema Lynn
name: Choi, C. Jean
name: Wall, Melanie M.
Publisher: name: Columbia University
Year: 2018
Subjects: Public health
HIV infections—Prevention

description: Providers of social and public health services (“providers”) often use HIV prevention strategies with substance-using clients to decrease HIV transmission and infection. This article examines factors that facilitate providers’ use of select HIV-prevention strategies. Sample comprises 379 providers from 36 agencies in New York City. Outcomes: sexual risk assessments; risk reduction counseling; condom demonstration; and referrals to HIV testing. Predictors: training; job satisfaction; staff collaboration. The authors used multilevel logistic regression and linear multilevel models. HIV prevention training was associated with increased performance of each outcome. The odds of conducting several outcomes were higher for providers trained in evidence-based interventions. Staff collaboration and job satisfaction were associated with provision of multiple outcomes. This study shows training and collaboration/satisfaction as significantly influencing providers to use prevention strategies. Providers ought to be trained in multiple modalities, and agencies ought to prioritize collaborative environments that promote job satisfaction.
Bioeconomic Perspectives to an Optimal Control Dengue Model
Creators: name: Rodrigues, Helena Sofia
name: Monteiro, M. Teresa T.
name: Torres, Delfim F. M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Optimization and Control (math.OC)
subject: Populations and Evolution (q-bio.PE)
subject: FOS: Mathematics
subject: FOS: Biological sciences
subject: 49M37, 92B05

description: A model with six mutually-exclusive compartments related to dengue is studied. Three vector control tools are considered: insecticides (larvicide and adulticide) and mechanical control. The basic reproduction number associated to the model is presented. The problem is studied using an optimal control approach. The human data is based on the dengue outbreak that occurred in Cape Verde. Control measures are simulated in different scenarios and their consequences analyzed.
description: This is a preprint of a paper whose final and definitive form will appear in International Journal of Computer Mathematics, DOI: 10.1080/00207160.2013.790536. Paper submitted 09-Aug-2012; revised 07-Jan-2013; accepted for publication 21-Mar-2013. arXiv admin note: substantial text overlap with arXiv:1207.1949
Interprofessional collaboration and on-the-job training improves access to HIV testing, HIV primary care and Pre-Exposure Prophylaxis (PrEP)
Creators: name: Pinto, Rogério M.
name: Witte, Susan S.
name: Filippone, Prema Lynn
name: Choi, C. Jean
name: Wall, Melanie
Publisher: name: Columbia University
Year: 2018
Subjects: Public health
HIV (Viruses)--Testing
Continuum of care

description: The HIV Continuum of Care is a global priority, yet vulnerable patients face access/retention challenges. Research is missing on the role social and public health service providers can play to help these patients. Using structural equation modeling, we examined the effects of interprofessional collaboration (IPC) and on-the-job training on the frequency of linkages to HIV testing, HIV primary care, and on Pre-Exposure Prophylaxis (PrEP) psychoeducation. Sample included 285 New York City providers of social and public health services – in 34 agencies. Forty- eight percent of providers had not offered PrEP psychoeducation and linked fewer than five patients to HIV testing and primary care per week. However, in multivariate analysis higher IPC was associated with more linkages and frequent psychoeducation. After adjusting for IPC, linkage training was associated with more frequent services. The influence of specific factors highlights areas for interventions and policies to improve access to the HIV Continuum of Care.
Spatial non-locality in confined quantum systems: a liaison with quantum correlations
Creators: name: Christov, Ivan P.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Using advanced stochastic methods (time-dependent quantum Monte Carlo, TDQMC) we explore the ground state of 1D and 2D artificial atoms with up to six bosons in harmonic trap where these interact by long-range and short-range Coulomb-like potentials (bosonic quantum dots). It is shown that the optimized value of the key variational parameter in TDQMC named nonlocal correlation length is close to the standard deviation of the Monte Carlo sample for one boson and it is slightly dependent on the range of the interaction potential. Also it is almost independent on the number of bosons for the 2D system thus confirming that the spatial quantum non-locality experienced by each particle is close to the spatial uncertainty exhibited by the rest of the particles. The intimate connection between spatial non-locality and quantum correlations is clearly evidenced.
Packet-Switched On-Chip FPGA Overlay Networks
Creators: name: Kapre, Nachiket Ganesh
Publisher: name: California Institute of Technology
Year: 2006
Subjects: virtual channels
cut-through
NoC
packet switched
packet switching
adaptive routing
network on chip
networks
fpga
BFT
Computer Science
butterfly fat tree
on-chip

description: As we scale to larger chip capacities, it becomes possible to map large, concurrent applications to programmable fabrics. These applications often have irregular and dynamic communication requirements. Packet-switched networks provide efficient implementations for such applications on these fabrics. In this research, we show how to engineer high-performance packet-switched on-chip networks and provide quantitative comparisons between different kinds of these networks. We analyse different network topologies and justify selection of topologies based on experimental results. We investigate packet-switched and time-multiplexed styles of routing and provide guidance on which style is appropriate for which application.
Effective Hamiltonian for the hybrid double quantum dot qubit
Creators: name: Ferraro, E.
name: De Michielis, M.
name: Mazzeo, G.
name: Fanciulli, M.
name: Prati, E.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Quantum dot hybrid qubits formed from three electrons in double quantum dots represent a promising compromise between high speed and simple fabrication for solid state implementations of single qubit and two qubits quantum logic ports. We derive the Schrieffer-Wolff effective Hamiltonian that describes in a simple and intuitive way the qubit by combining a Hubbard-like model with a projector operator method. As a result, the Hubbard-like Hamiltonian is transformed in an equivalent expression in terms of the exchange coupling interactions between pairs of electrons. The effective Hamiltonian is exploited to derive the dynamical behaviour of the system and its eigenstates on the Bloch sphere to generate qubits operation for quantum logic ports. A realistic implementation in silicon and the coupling of the qubit with a detector are discussed.
description: 9 pages, 4 figures
Design of a granular pressure cell to be used in soils
Creators: name: Meuris, Jean Maurice
Publisher: name: California Institute of Technology
Year: 1961
Subjects: subject: Civil Engineering
subject: FOS: Civil engineering

description: In preliminary experimentation, a granular pressure cell was built and tested. From the results obtained, an improved method for the production of granular pressure cells was developed and a second pressure cell was built in order to determine the behavior of granular pressure cells, as designed, under variable external temperature conditions.

A third pressure cell was built for laboratory testing. A calibration curve was established and the pressure cell was used satisfactorily in simple laboratory testing.

Attempts were made to improve the constitution of granular pressure cells as used in the aforementioned tests. These attempts lead to suggestions intended to help in eventual further improvement of the granular pressure cells built and described in the following pages.
Time to update those abstract guidelines - presentation at the 3rd AEUP Conference "Publishing in Nervous Times"
Creators: name: Ekanger, Aysa
Publisher: name: Zenodo
Year: 2023
Subjects: academic publishing
scholarly communication
abstracts
Web accessibility

description: A presentation by Aysa Ekanger about abstract guidelines presented at the 3rd AEUP Conference "Publishing in Nervous Times" on 16 May 2023 in Tallinn, Estonia.
Heterogeneous nickel isotopic compositions in the terrestrial mantle – Part 1: Ultramafic lithologies
Creators: name: Saunders, Naomi J.
name: Barling, Jane
name: Harvey, Jason
name: Fitton, J. Godfrey
name: Halliday, Alexander N.
Publisher: name: Columbia University
Year: 2020
Subjects: subject: Nickel
subject: Pyroxenite
subject: Peridotite
subject: Geochemistry
subject: FOS: Earth and related environmental sciences

description: High precision nickel stable isotopic compositions (δ⁶⁰/⁵⁸Ni) are reported for 22 peridotite xenoliths from the USA (Kilbourne Hole, New Mexico), Tanzania, and Cameroon. For a subset of these, δ⁶⁰/⁵⁸Ni is also reported for their constituent mineral separates (olivine, orthopyroxene, clinopyroxene, and spinel). Bulk peridotites show significant heterogeneity in Ni isotopic composition, ranging from +0.02‰ to +0.26‰. Unmetasomatised fertile peridotites from three localities, define an average δ⁶⁰/⁵⁸Ni of +0.19±0.09‰ (n = 18). This value is comparable to previous estimates for the δ⁶⁰/⁵⁸Ni of the bulk silicate earth (BSE), but is unlikely to be representative, given observed heterogeneity, presented here and elsewhere. Samples with reaction rims and interstitial glass (interpreted as petrographic indications of minor metasomatism) were excluded from this average; their Ni isotopic compositions extend to lighter values, spanning nearly the entire range observed in peridotite worldwide. Dunites (n = 2) are lighter in δ⁶⁰/⁵⁸Ni than lherzolites and harzburgites from the same location, and pyroxenites (n = 5) range from +0.16‰ to as light as −0.38‰. The δ⁶⁰/⁵⁸Ni in the Kilbourne Hole xenoliths correlate negatively with bulk-rock Fe concentration and positively with ¹⁴³Nd/¹⁴⁴Nd, providing evidence that light δ⁶⁰/⁵⁸Ni is associated with mantle fertility and enrichment. The trend between δ⁶⁰/⁵⁸Ni and Fe concentration in bulk rocks appears to be global, replicated across the peridotites in this work from other localities, and in literature data. The inter-mineral fractionations are small; the maximum difference between heaviest and lightest phase is 0.12‰. This provides evidence that bulk rock δ⁶⁰/⁵⁸Nii variation does not result from differences in modal mineralogy, fractional crystallization or degrees of partial melting. The δ⁶⁰/⁵⁸Ni fractionation appears to be an equilibrium effect and usually is in the decreasing order spinel > olivine = orthopyroxene > clinopyroxene. However, the fractionation between clinopyroxene and orthopyroxene varies in magnitude and sign, and is correlated with pyroxene Si/Fe positively, and Fe/Mg negatively. The magnitude of inter-pyroxene fractionation also correlates with other pyroxene compositional ratios (e.g. La/Sm_clinopyroxene); as well as bulk rock δ⁶⁰/⁵⁸Ni, and [U]. These data provide evidence that Ni isotopes fractionate at the bulk rock and mineral scale in response to mantle enrichment processes, possibly related to recycling of isotopically light subducted components.
Spatially resolved H_2 emission from a very low-mass star
Creators: name: Lopez, R. Garcia
name: Garatti, A. Caratti o
name: Weigelt, G.
name: Nisini, B.
name: Antoniucci, S.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Molecular outflows from very low-mass stars (VLMSs) and brown dwarfs have been studied very little. So far, only a few CO outflows have been observed, allowing us to map the immediate circumstellar environment. We present the first spatially resolved H2 emission around IRS54 (YLW52), a ~0.1-0.2 Msun Class I source. By means of VLT SINFONI K-band observations, we probed the H2 emission down to the first ~50 AU from the source. The molecular emission shows a complex structure delineating a large outflow cavity and an asymmetric molecular jet. Thanks to the detection of several H2 transitions, we are able to estimate average values along the jet-like structure (from source position to knot D) of Av~28 mag, T~2000-3000 K, and H2 column density N(H2)~1.7x10^17 cm^-2. This allows us to estimate a mass loss rate of ~2x10^-10 Msun/yr for the warm H2 component . In addition, from the total flux of the Br Gamma line, we infer an accretion luminosity and mass accretion rate of 0.64 Lsun and ~3x10^-7 Msun/yr, respectively. The outflow structure is similar to those found in low-mass Class I and CTTS. However, the Lacc/Lbol ratio is very high (~80%), and the mass accretion rate is about one order of magnitude higher when compared to objects of roughly the same mass, pointing to the young nature of the investigated source.
description: accepted as a Letter in A&A
title: We Travel Together: Examining the Drivers and Functions of Animal Movement in Biotic Seed Dispersal
Creators: name: Borah, Binod
Publisher: name: Utah State University
Year: 2023

description: Plants and frugivorous animals exist in mutually beneficial relations, as these animals feed on fruits, ingest the seeds, and carry them away from the parent trees. Such dispersion of seeds over space helps them colonize new habitats, escape high mortality rates near their parent trees, and avoid competition with conspecifics. Therefore, seed dispersing animal movement can be critical for the persistence of plant populations. Yet what drives such seed disperser movement is often less understood and how it affects seed dispersal is little explored. In my dissertation, I investigate multiple drivers of seed disperser movement, link movement to potential seed dispersal patterns, and how such movement and thus seed dispersal can be impacted by anthropogenic impacts. In chapter 1, I develop a framework that can allow us to couple seed disperser movement with the seed dispersal patterns, by using information from different movement drivers and characterizing movement into different activity modes. In chapter 2, I show that the external environment can be an important driver of a tropical seed dispersers' movement and impact how far seeds are carried from their parent trees and the conditions they experience at their deposition sites. In chapter 3, I show that certain seed dispersers can account for multiple resource attributes while foraging, which in turn can affect their movement and hence seed dispersal patterns. Thus, seed dispersers' navigational capabilities can play important roles in their seed dispersal services. In chapter 4, using computer simulations, I showed that habitat loss can have stronger impacts on seed dispersal patterns such as long seed dispersal distances than habitat fragmentation, yet fragmentation impacts become more significant when habitat amount fell below a threshold. Finally, in chapter 5, I showed that the loss of large dispersers and therefore their movement from tropical ecosystems strongly reduced the long-dispersal seed dispersal of large-fruited plants. In summary, through my dissertation I showed that seed disperser movement is a critical component of plant seed dispersal.
Lateral stability of thin tapered struts
Creators: name: Durup, Paul Christian
name: Weisenberg, Joseph Oscar
Publisher: name: California Institute of Technology
Year: 1947
Subjects: Aeronautics
Aeronautical Engineering

description: From the experimental investigation detailed herein it has been determined, at least for two types of struts, that there is a very close correlation between (1) the experimentally determined buckling load which a given strut will sustain and (2) the critical load determined by the use of Southwell’s method, which does not entail loading the strut to its critical load. By using an initial eccentricity and loads considerably less than the original, the critical load may be derived from the results of three or four simple test readings, not requiring an elaborate or refined setup.

Experimental verification of existing theory of lateral buckling is noted for the case of struts tapered to a point at the application of the loading.

The possibility of determining the eccentricity of a given loading by plots of β/p vs. β is pointed out and the type of curve to be expected as noted. However due to lack of refinement of the experimental setup, no definite conclusions are presented.

The theoretical portion of this thesis offers the derivation of a formula for the lateral buckling of a thin linearly tapered strut of constant thickness. Due to the complexity of the problem certain simplifications were made to facilitate this derivation.

Comparison of the values determined by use of this formula with the values experimentally determined for four struts shows a fairly close correlation.

It is suggested that in some future work a more thorough investigation be made of the relation between the eccentricity of the loading and the load which a strut will carry, using a given deflection as a parameter.
Flash Survey Global Climate Strike September 24, 2021
Creators: name: Pizmony-Levy, Oren
name: Kessler, Erika Lyn
Publisher: name: Columbia University
Year: 2021
Subjects: Students--Political activity
Political participation
Youth
Climatic changes

description: More than 2,000 students and climate activists participated in the Global Climate Strike on September 24, 2021, which was organized by the New York City chapter of Fridays For Future, a youth-led climate-advocacy group, during NYC Climate Week 2021. This PowerPoint summarizes results from a flash survey of young participants at the event (n=203). Participants were mostly young high school and college women (70%) who are on average 16 years old. About half (49%) of the sample is people of color. Over half (54%) participated in school climate strikes before the event, yet 3 out of 4 did not identify any organization contacted them to participate in the strike. Those who were contacted by organizations named Fridays for Future NYC, Sunrise and Our Climate as organizations they were affiliated with; these organizations are also the primary organizers of the strike, most central being Fridays for Future. Overall, we find that participants report learning about climate change and activism in their classrooms and feel supported in participating in climate action. We heard from participants that they are largely anxious, frustrated, fearful, and sad. We do find that their range of anxieties and frustration are also linked to feelings of hopefulness and determination.
Ignoring Turkey is not an option
Creators: name: Cooley, Alexander A.
name: Mangiriadis, Apostolos
Publisher: name: Columbia University
Year: 2021
Subjects: International relations

description: Interview of Professor Cooley conducted by Apostolos Mangiriadis for Kathimerini, Greek newspaper (English edition), on the state of US foreign policy, the degradation of liberal values around the world and the rising “authoritarian tide” cuts across a number of societies in the West. November 11, 2021
On sign changes of q-exponents of generalized modular functions
Creators: name: Kumar, Narasimha
Publisher: name: arXiv
Year: 2012
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11F03, 11F11 (Primary), 11F30 (Secondary)

description: Let f be a generalized modular function of weight 0 of level N such that its q-exponents c(n)(n>0) are all real, and div(f) is zero. In this note, we show the equidistribution of signs for c(p)(p prime) by using equidistribution theorems for normalized cuspidal eigenforms of integral weight.
description: to appear in the Journal of Number Theory
Análisis de la imagen urbana de la Calle Real Xalteva en la Ciudad de Granada (Protocolo para proyecto de investigación)
Creators: name: Meléndez, Franck
Publisher: name: figshare
Year: 2021
Subjects: subject: 120102 Architectural Heritage and Conservation
subject: FOS: Civil engineering

description: Protocolo para proyecto investigativo referente a la tipificación de características formales del patrimonio construido en la Ciudad de Granada con especial énfasis en el espacio urbano como común denominador de los objetos arquitectónicos aislados.
An experimental investigation of the general instability of ring-stiffened, unpressurized, thin-walled cylinders under axial compression
Creators: name: McCoy, John C.
Publisher: name: California Institute of Technology
Year: 1958
Subjects: Aeronautics

description: Eight different series of thin-walled Mylar cylinders were tested experimentally to investigate the general instability of ring-stiffened, unpressurized, thin-walled cylinders under axial compressive loading. The primary objectives for these tests were:  to determine whether the bending or the torsional stiffness of the rings was the most effective stiffening parameter; to determine the relative effectiveness of ring-stiffeners around the inside and the outside of the cylinders; and to investigate the mechanism of buckling of unpressurized cylinders under axial compression.

It was found that the torsional stiffness of the ring-stiffeners was the most important parameter for stiffening the thin-walled Mylar cylinders under axial loading. Ring-stiffeners with a low torsional stiffness did not stiffen the cylinder effectively until the rings were closely spaced. Ring-stiffeners on the inside of the cylinders did not affect the maximum buckling load when they were not bonded to the cylinder walls. Ring-stiffeners on the outside of the cylinders provided effective stiffening whether they were bonded to the cylinder walls or not.

The experimental results of thin-walled cylinders under axial compression indicated that the cylinder walls expand laterally to some critical amount, at which time they become unstable and suddenly collapse into buckling. The ring-stiffeners increase the critical compressive load with their effective torsional stiffness by resisting the annular collapse of the cylinder walls into diamond shaped buckles. At an L/R ring spacing ratio of 1.0 or less, the walls tended to buckle across the ring-stiffeners.
Studies in enzyme crystallography
Creators: name: Brueckner, David Armstrong
Publisher: name: California Institute of Technology
Year: 1966
Subjects: Chemistry

description: This thesis presents X-ray crystallographic research on chymotrypsin and lysozyme. Seven crystal types of chymotrypsin were identified -- five for the first time. The seven crystal types appear to be different packings of two conformations of the same molecule.

One crystal type of lysozyme was studied. From Patterson projections of crystals diffused with PtI_6^= ions, the x, y, and z coordinates for these ions were determined. After one least squares refinement of these coordinates, the agreement factor between calculated and observed contributions of the PtI_6^= ions was 0.34 for 108 hkO and hOl reflections. Using these coordinates, an hkO and an hOl Fourier projection were prepared.

X and y coordinates for the heavy atoms in lysozyme crystals diffused with UO_2^(++) ions, WO_4^= ions, HgI_4^= ions, HgCl_2, ThCl_4, and p-ClHgфSO_3H were determined from Patterson and Fourier projections.
To Re-Establish U.S. Influence, Biden Should Play Rope-a-Dope, Not Compete Globally
Creators: name: Cooley, Alexander A.
name: Nexon, Daniel
Publisher: name: Columbia University
Year: 2021
Subjects: subject: Great powers
subject: Political science
subject: FOS: Political science
subject: International relations

description: Rather than reclaim global dominance by outspending and overpowering new contenders, U.S. planners should instead simply not contest many of Beijing’s and Moscow’s costly efforts to expand their networks of clients.
An investigation of the mechanism of heat transfer near the critical state of a fluid
Creators: name: Griffith, Jerry D.
Publisher: name: California Institute of Technology
Year: 1960
Subjects: subject: Mechanical Engineering
subject: FOS: Mechanical engineering

description: Very large heat transfer coefficients have been observed in the one phase region near the critical point of some fluids. There has been some conjecture that the increase in these coefficients might be due to the agitation caused by bubble-like aggregates of low density fluid. It was believed that these bubble-like formations might grow and collapse in much the same way as actual bubbles in nucleate boiling. The purpose of these experiments was to see if the suggested mechanism of heat transfer could be observed and if it could be related to a significant increase in the heat transfer rate. Freon 114A was chosen as the test fluid because of its relatively low critical temperature and pressure. With this fluid and with the range of variables tested, bubble-like formations were observed under some conditions. However, no definite correlation to an increase in the heat transfer rate was noted. This fact should not exclude the possibility that bubble-like activity might result in a sharp increase in heat transfer rates in other fluids or even under different operating conditions with the fluid in question.
title: The Latin American and Indigenous Peoples of the Americas funnel
title: El embudo de Latino América y de los Pueblos Indígenas de las Américas
titleType: AlternativeTitle
Creators: name: Levinson, Sara
Publisher: name: IUPUI University Library
Year: 2023
Subjects: SACO funnels
Indigenous peoples
Library of Congress subject headings
Library of Congress classification

description: This is an introduction to the LAIPA (Latin American and Indigenous Peoples of the America) SACO funnel. It gives a brief overview of how and why it was formed and some of the work that the group has undertaken. It also some of the projects they are working on at the current time and hopes for the future.
How can the world hold Belarus accountable?
Creators: name: Cooley, Alexander A.
Publisher: name: Columbia University
Year: 2021
Subjects: subject: Political persecution
subject: Political science
subject: FOS: Political science
subject: International relations

description: Opinion post for the Washington Post's Monkey Cage blog on the state-sponsored hijacking of a Ryanair flight to Belarus and detention of an exiled journalist passenger as the latest example of the growing challenge of confronting Transnational Repression. May 25, 2021
Towards equation of state of dark energy from quasar monitoring: Reverberation strategy
Creators: name: Czerny, B.
name: Hryniewicz, K.
name: Maity, I.
name: Schwarzenberg-Czerny, A.
name: Zycki, P. T.
name: Bilicki, M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: High redshift quasars can be used to deduce the distribution of dark energy in the Universe, as a complementary tool to SN Ia. The method is based on determination of the size of the Broad Line Region from the emission line delay, determination of the absolute monochromatic luminosity either from the observed statistical relation or from a model of the formation of the Broad Line Region, and determination of the observed monochromatic flux from photometry. This allows to obtain the luminosity distance to a quasar independently from its redshift. The accuracy of the measurements is however, a key issue. We model the expected accuracy of the measurements by creating artificial quasar monochromatic lightcurves and responses from the Broad Line Region under various assumptions about the variability of a quasar, Broad Line Region extension, distribution of the measurements in time, accuracy of the measurements and the intrinsic line variability. We show that the five year monitoring based on Mg II line should give the accuracy of 0.06 - 0.32 magnitude in the distance modulus which allows to put interesting constraints on the cosmological models. Monitoring of higher redshift quasars based on CIV lines is problematic due to much higher level of the intrinsic variability of CIV in comparison with Mg II.
description: accepted to Astronomy & Astrophysics
title: Cross-Boundary Stewardship in Protected Area Centered Ecosystems: Perceptions of Success and Characteristics of Cooperative Engagement
Creators: name: Tarver, Ryan D.
Publisher: name: Utah State University
Year: 2023

description: The legal boundaries of protected areas, such as national parks are established and enforced by humans. Therefore, jurisdictional boundaries are ultimately have human meaning but not necessarily ecological relevance as natural phenomena such as watersheds and wildlife habitat often extend beyond a jurisdictional boundary. When considering the extent of natural system, we find that protected areas only make up part of a given ecosystem. The result is a large expanse of lands that fall under a various ownership types that include both publicly and privately designated tracts of land. This presents a management challenge when attempting to manage at the landscape-scale. Therefore, this research aims to explore cooperation among, and between the various actors living and working within a protected area-centered ecosystem (PACE). Through interviews with public land management officials, we found that successful cooperation is comprised of two overarching components: (1) Process (the ways in which success is achieved) and; (2) Outcome (measures, or evidence of successful cooperation). Additionally, a survey conducted among private landowners provided findings that suggest cooperation is correlated to shared objectives and shared beliefs about the need for cross-boundary management activities. Finally, this research suggests that the majority of private landowners are willing to work with public agencies and organizations and the importance of peer-to-peer communication in fostering cooperative engagement at the public-private interface.
Supplemental tables for "Risk of Parkinson's disease in celiac disease: A Swedish population-based study"
Creators: name: Kang, Xiaoying
name: Ploner, Alexander
name: Roelstraete, Bjorn
name: Ludvigsson, Jonas F.
name: Wirdefeldt, Karin
Publisher: name: Zenodo
Year: 2023
Subjects: Celiac disease
Parkinson's disease
Cohort study

description: This file contains two tables listing the codes used to ascertain key variables analyzed in the article entitled "Risk of Parkinson’s disease in celiac disease: A Swedish population-based study".
The International Dimensions of the New Transnational Repression
Creators: name: Cooley, Alexander A.
Publisher: name: Columbia University
Year: 2019
Subjects: subject: Political persecution
subject: Authoritarianism
subject: Exiles
subject: Political science
subject: FOS: Political science

description: Congressional Testimony: Written Testimony before the Commission on Security and Cooperation in Europe “Tools of Transnational Repression” September 12, 2019.
Proposed imaging of the ultrafast electronic motion in samples using x-ray phase-contrast
Creators: name: Dixit, Gopal
name: Slowik, Jan Malte
name: Santra, Robin
Publisher: name: arXiv
Year: 2013
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Atomic and Molecular Clusters (physics.atm-clus)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Tracing the motion of electrons has enormous relevance to understanding ubiquitous phenomena in ultrafast science, such as the dynamical evolution of the electron density during complex chemical and biological processes. Scattering of ultrashort x-ray pulses from an electronic wavepacket would appear to be the most obvious approach to image the electronic motion in real-time and real-space with the notion that such scattering patterns, in the far-field regime, encode the instantaneous electron density of the wavepacket. However, recent results by Dixit {\em et al.} [Proc. Natl. Acad. Sci. U.S.A., {\bf 109}, 11636 (2012)] have put this notion into question and shown that the scattering in the far-field regime probes spatio-temporal density-density correlations. Here, we propose a possible way to image the instantaneous electron density of the wavepacket via ultrafast x-ray {\em phase contrast imaging}. Moreover, we show that inelastic scattering processes, which plague ultrafast scattering in the far-field regime, do not contribute in ultrafast x-ray phase contrast imaging as a consequence of an interference effect. We illustrate our general findings by means of a wavepacket that lies in the time and energy range of the dynamics of valence electrons in complex molecular and biological systems. This present work offers a potential to image not only instantaneous snapshots of non-stationary electron dynamics, but also the Laplacian of these snapshots which provide information about the complex bonding and topology of the charge distributions in the systems.
description: 12 pages, 2 figures, article accepted in Physical Review Letters (2013)
Von Neumann entropy and majorization
Creators: name: Li, Yuan
name: Busch, Paul
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We consider the properties of the Shannon entropy for two probability distributions which stand in the relationship of majorization. Then we give a generalization of a theorem due to Uhlmann, extending it to infinite dimensional Hilbert spaces. Finally we show that for any quantum channel $Φ$, one has $S(Φ(ρ))=S(ρ)$ for all quantum states $ρ$ if and only if there exists an isometric operator $V$ such that $Φ(ρ)=VρV^*$.
description: Version 2 contains some corrections and linguistic improvements
Paying for a World Class Affiliation: Reputation Laundering in the University Sector of Open Societies
Creators: name: Cooley, Alexander A.
name: Prelec, Tena
name: Heathershaw, John
name: Mayne, Tom
Publisher: name: Columbia University
Year: 2021
Subjects: subject: Political corruption
subject: Reputation
subject: Education, Higher
subject: Political science
subject: FOS: Political science

description: Executive Summary Modern kleptocracy thrives on the ability of kleptocrats and their associates to use their ill-gotten gains in open settings. This often takes the form of investing in high-end real estate or other luxury goods, which serves to both obscure the corrupt origin of the money and to protect it for future use. But there is also a subtler dynamic at play. The use of kleptocratic-linked funding or other forms of engagement in open societies to blur the illicit nature and source of the donation serves to laun- der kleptocrats’ reputations, as well as their cash. This careful cultivation of positive publicity and influence empowers autocrats and their cronies. It also entrenches kleptocrats—and the regimes with which they are associated—in positions of power. Universities and think tanks in open settings are prime targets for reputation laun- dering. The rapid internationalization of the higher education sector, as well as the swelling demand worldwide for Western education makes academic institutions particularly vulnerable to this form of transnational kleptocratic activity. Indeed, over recent years, there has been a major surge of foreign funding to U.S. and U.K. universities. The composition of fundraising has also changed. Major gifts comprise a growing share of donations, and a relatively small number of wealthy individuals contribute nearly 80 percent of gift-giving to universities. These challenges also affect other open countries where foreign gifts traditionally have not been a major source of funding but are now actively being offered and sought. Countries like the Czech Republic and Germany have witnessed high-profile scandals involving funding from PRC-connected sources, both in exerting influence through opaque payments to faculty or through the application of Chinese law to donor agreements with the university. Such examples highlight the transnational nature of this challenge. Key mechanisms by which individuals can launder their reputations in the higher education sector include: • Endowing university programs and institutes as private citizens to garner legal standing and support in their country of operation, or to influence the academic remit of certain institutions; • Serving as guest speakers or lecturers at high-profile events, thereby having a platform from which they can garner positive publicity and present themselves as influential philanthropists and leaders; • Gaining preferential admission to academic institutions for themselves, their family, and associates, conferring prestige to the donor and creating new networks for overseas employment, association, and residence.
Open-hearted change management: New visions for successfully introduced institutional publishing at Karlsruhe Institute of Technology (KIT) - presentation at the 3rd AEUP Conference "Publishing in Nervous Times"
Creators: name: Tobias, Regine
Publisher: name: Zenodo
Year: 2023
Subjects: institutional publishing
academic publishing
open access
scholarly communication
change management

description: A presentation by Regine Tobias about New visions for successfully introduced institutional publishing at Karlsruhe Institute of Technology presented at the 3rd AEUP Conference "Publishing in Nervous Times" on 16 May 2023 in Tallinn, Estonia.
Securing the neighborhood: China’s evolving security footprint in Central Asia
Creators: name: Cooley, Alexander A.
Publisher: name: Columbia University
Year: 2020
Subjects: subject: Private security companies
subject: Electronic surveillance
subject: Military bases
subject: Political science
subject: FOS: Political science

description: This article published for the TRENDS website expires China's increasing security ties and footprint in Central Asia since the announcement of its signature Belt & Road initiative in 2013. The article identifies Chinese security priorities– including securing BRI investments and stabilizing Xinjiang–focuses on China's adoption of surveillance technologies, the growth of Chinese private security companies, and the establishment of Chinese security facilities and joint border posts in Tajikistan.
Graph Representation Learning in Biomedicine
Creators: name: Li, Michelle M.
name: Huang, Kexin
name: Zitnik, Marinka
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Social and Information Networks (cs.SI)
subject: Biomolecules (q-bio.BM)
subject: Genomics (q-bio.GN)
subject: Molecular Networks (q-bio.MN)
subject: FOS: Computer and information sciences
subject: FOS: Biological sciences

description: Biomedical networks (or graphs) are universal descriptors for systems of interacting elements, from molecular interactions and disease co-morbidity to healthcare systems and scientific knowledge. Advances in artificial intelligence, specifically deep learning, have enabled us to model, analyze, and learn with such networked data. In this review, we put forward an observation that long-standing principles of systems biology and medicine -- while often unspoken in machine learning research -- provide the conceptual grounding for representation learning on graphs, explain its current successes and limitations, and even inform future advancements. We synthesize a spectrum of algorithmic approaches that, at their core, leverage graph topology to embed networks into compact vector spaces. We also capture the breadth of ways in which representation learning has dramatically improved the state-of-the-art in biomedical machine learning. Exemplary domains covered include identifying variants underlying complex traits, disentangling behaviors of single cells and their effects on health, assisting in diagnosis and treatment of patients, and developing safe and effective medicines.