cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Static- and Stationary-complete Spacetimes: Algebraic and Causal Structures
Creators: name: Harris, Steven G.
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 53C50, 83C20

description: This is intended as an analysis of the global properties of static and stationary spacetimes with complete (timelike) Killing field, with particular attention to quotients by group actions. This is presented in terms of algebraic structures which are fairly simple for the static case and more involved for the stationary case; the most important tool, the fundamental cocycle, is a cohomological class for static spacetimes but of somewhat looser structure in the stationary case. In particular: (1) A new measurement, similar to the spacetime interval in Minkowski space, is devised for detecting whether two points are causally related in a stationary spacetime; this proves very useful for analysis. (2) All stationary spacetimes are categorized by how they behave with respect to the fundamental cocycle; this enables a complete characterization of global causality properties. (3) It is shown how these tools determine whether global hyperbolicity of a stationary spacetime is inherited by its quotients. (4) Examples are examined in detail, a large range including both ones of mathematical curiosity and ones of physical interest, such as cosmic strings in flat, accelerated, Schwarzschild, Kerr, and other backgrounds.
description: 48 pages; this is version 3, correcting the proof of Theorem 2.18 and making a number of largely cosmetic changes
title: The response of structures to acoustic excitation and the transmission of sound and vibration
Creators: name: J. Crocker, Malcolm
Publisher: name: University of Liverpool Repository
Year: 2023

description: A study of the expression for the response power spectral density of linear systems to random pressures shows that the response problem essentially reduces to evaluating the joint acceptance of the system with the pressure field. A novel method using a coordinate transformation is presented. This method enables one to determine very simply the joint acceptance of a beam that has arbitrary end constraints with a pressure field that has a spatial-pressure correlation function that is easily described mathematically. The joint acceptance of a simply supported beam with a reverberant acoustic field as a function of mode number and nondimensionalized frequency parameter (beam length/acoustic wavelength) has been computed for the first 16 modes. An engineering approximation for the joint acceptance of a simply supported flat plate with a reverberant acoustic field is obtained from the beam results. The method is also used to determine very simply beam and flat-plate joint acceptance with a turbulent-boundary-layer pressure field and with an acoustic plane wave.
Contemporaneous N2 Fixation and Oxygenic Photosynthesis in the Nonheterocystous Mat-Forming Cyanobacterium Lyngbya aestuarii
Creators: name: The University of North Carolina at Chapel Hill University Libraries
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1991

description: The nonheterocystous filamentous cyanobacterial genus Lyngbya is a widespread and frequently dominant component of marine microbial mats. It is suspected of contributing to relatively high rates of N(2) fixation associated with mats. The ability to contemporaneously conduct O(2)-sensitive N(2) fixation and oxygenic photosynthesis was investigated in Lyngbya aestuarii isolates from a North Carolina intertidal mat. Short-term (<4-h) additions of the photosystem II (O(2) evolution) inhibitor 3(3,4-dichlorophenyl)-1,1-dimethylurea stimulated light-mediated N(2) fixation (nitrogenase activity), indicating potential inhibition of N(2) fixation by O(2) production. However, some degree of light-mediated N(2) fixation in the absence of 3(3,4-dichlorophenyl)-1,1-dimethylurea was observed. Electron microscopic immunocytochemical localization of nitrogenase, coupled to microautoradiographic studies of CO(2) fixation and cellular deposition of the tetrazolium salt 2,4,5-triphenyltetrazolium chloride, revealed that (i) nitrogenase was widely distributed throughout individual filaments during illuminated and dark periods, (ii) CO(2) fixation was most active in intercalary regions, and (iii) daylight 2,4,5-triphenyltetrazolium chloride reduction (formazan deposition) was most intense in terminal regions. Results suggest lateral partitioning of photosynthesis and N(2) fixation during illumination, with N(2) fixation being confined to terminal regions. During darkness, a larger share of the filament appears capable of N(2) fixation.
SOUTHEAST ASIA AND LATIN AMERICA - A DECADE OF TRADE RELATIONS (2002-2012)
Creators: name: Jakarin Srimoon
Publisher: name: University of the Thai Chamber of Commerce
Year: 2014
Subjects: trade relations
inter-regional trade
free trade agreements
ASEAN
Southeast Asia
Latin America

description: UTCC International Journal of Business and Economics, 6, 1, 139-152
Ecophysiological and Trophic Implications of Light-Stimulated Amino Acid Utilization in Marine Picoplankton
Creators: name: The University of North Carolina at Chapel Hill University Libraries
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1991

description: By using microautoradiography, light-stimulated utilization of dissolved amino acids for natural marine phytoplankton assemblages was demonstrated. The <2-mum-size (diameter) picoplankton, known to be a dominant fraction of marine primary production, revealed a widespread capability for this process. Autofluorescent (chlorophyll a-containing) picoplankton and some larger phytoplankton from diverse oceanic locations, as well as isolates of the representative cyanobacterial picoplankton Synechococcus spp. (WH7803, WH8101), showed light-stimulated incorporation of amino acids at trace concentrations. Dark-mediated amino acid utilization was dominated by nonfluorescent bacterial populations. Among autofluorescent picoplankton, light-stimulated exceeded dark-mediated amino acid incorporation by 5 to 75%; light-stimulated amino acid incorporation was only partially blocked by the photosystem II inhibitor 3(3,4-dichloro-phenyl)-1,1-dimethy-lurea (2 x 10 M), suggesting a photoheterotrophic incorporation mechanism. Parallel light versus dark incubations with glucose and mannitol indicated a lack of light-stimulated utilization of these nonnitrogenous compounds. Since marine primary production is frequently nitrogen limited, light-mediated auxotrophic utilization of amino acids and possibly other dissolved organic nitrogen (DON) constituents may represent exploitation of the relatively large DON pool in the face of dissolved inorganic nitrogen depletion. This process (i) increases the efficiency of DON retention at the base of oceanic food webs and (ii) may in part be responsible for relatively high rates of picoplankton production under conditions of chronic dissolved inorganic nitrogen limitation. Picoplanktonic recycling of organic matter via this process has important ramifications with respect to trophic transfer via the "microbial loop."
Optical spectra from molecules to crystals: Insight from many-body perturbation theory
Creators: name: Cocchi, Caterina
name: Draxl, Claudia
Publisher: name: arXiv
Year: 2015
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Time-dependent density-functional theory (TDDFT) often successfully reproduces excitation energies of finite systems, already in the adiabatic local-density approximation (ALDA). Here we show for prototypical molecular materials, i.e., oligothiophenes, that ALDA largely fails and explain why this is so. By comparing TDDFT with an in-depth analysis based on many-body perturbation theory, we demonstrate that correlation effects crucially impact energies and character of the optical excitations not only for molecules of increasing length and in crystalline environment, but even for isolated small molecules. We argue that only high-level methodologies, which explicitly include correlation effects, can reproduce optical spectra of molecular materials with equal accuracy from gas phase to crystal structures.
Low-data deep quantum chemical learning for accurate MP2 and coupled-cluster correlations
Creators: name: Ng, Wai-Pan
name: Liang, Qiujiang
name: Yang, Jun
Publisher: name: arXiv
Year: 2023
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: Accurate ab-initio prediction of electronic energies is very expensive for macromolecules by explicitly solving post-Hartree-Fock equations. We here exploit the physically justified local correlation feature in compact basis of small molecules, and construct an expressive low-data deep neural network (dNN) model to obtain machine-learned electron correlation energies on par with MP2 and CCSD levels of theory for more complex molecules and different datasets that are not represented in the training set. We show that our dNN-powered model is data efficient and makes highly transferable prediction across alkanes of various lengths, organic molecules with non-covalent and biomolecular interactions, as well as water clusters of different sizes and morphologies. In particular, by training 800 (H$_2$O)$_8$ clusters with the local correlation descriptors, accurate MP2/cc-pVTZ correlation energies up to (H$_2$O)$_{128}$ can be predicted with a small random error within chemical accuracy from exact values, while a majority of prediction deviations are attributed to an intrinsically systematic error. Our results reveal that an extremely compact local correlation feature set, which is poor for any direct post-Hartree-Fock calculations, has however a prominent advantage in reserving important electron correlation patterns for making accurate transferable predictions across distinct molecular compositions, bond types and geometries.
Multilaboratory evaluation of methods for detecting enteric viruses in soils.
Creators: name: The University of North Carolina at Chapel Hill University Libraries
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1991

description: Two candidate methods for the recovery and detection of viruses in soil were subjected to round robin comparative testing by members of the American Society for Testing and Materials D19:24:04:04 Subcommittee Task Group. Selection of the methods, designated "Berg" and "Goyal," was based on results of an initial screening which indicated that both met basic criteria considered essential by the task group. Both methods utilized beef extract solutions to achieve desorption and recovery of viruses from representative soils: a fine sand soil, an organic muck soil, a sandy loam soil, and a clay loam soil. One of the two methods, Goyal, also used a secondary concentration of resulting soil eluants via low-pH organic flocculation to achieve a smaller final assay volume. Evaluation of the two methods was simultaneously performed in replicate by nine different laboratories. Each of the produced samples was divided into portions, and these were respectively subjected to quantitative viral plaque assay by both the individual, termed independent, laboratory which had done the soil processing and a single common reference laboratory, using a single cell line and passage level. The Berg method seemed to produce slightly higher virus recovery values; however, the differences in virus assay titers for samples produced by the two methods were not statistically significant (P less than or equal to 0.05) for any one of the four soils. Despite this lack of a method effect, the
Antibubbles enable tunable payload release with low-intensity ultrasound
Creators: name: Moreno-Gomez, Nicolas
name: Athanassiadis, Athanasios G.
name: Poortinga, Albert T.
name: Fischer, Peer
Publisher: name: arXiv
Year: 2023
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: The benefits of ultrasound are its ease-of-use and its ability to precisely deliver energy in opaque and complex media. However, most materials responsive to ultrasound show a weak response, requiring the use of high powers, which are associated with undesirable streaming, cavitation, or temperature rise. These effects hinder response control and may even cause damage to the medium where the ultrasound is applied. Moreover, materials that are currently in use rely on all-or-nothing effects, limiting the ability to fine-tune the response of the material on the fly. For these reasons, there is a need for materials that can respond to low intensity ultrasound with programmable responses. Here it is demonstrated that antibubbles are a low-intensity-ultrasound-responsive material system that can controllably release a payload using acoustic pressures in the kPa range. Varying their size and composition tunes the release pressure, and the response can be switched between a single release and stepwise release across multiple ultrasound pulses. Observations using confocal and high-speed microscopy revealed different ways that can lead to release. These findings lay the groundwork to design antibubbles that controllably respond to low-intensity ultrasound, opening a wide range of applications ranging from ultrasound-responsive material systems to carriers for targeted delivery.
description: Main Text: 14 pages, 4 figures. Embedded SI: 4 pages, 5 figures
USING PROJECT MANAGEMENT OFFICE (PMO) TO IMPROVE PROJECT MANAGEMENT ABILITIES
Creators: name: Babaeianpour, Marzieh
Publisher: name: University of the Thai Chamber of Commerce
Year: 2014
Subjects: Project Management Office (PMO)
Value of Project Management
PMO Implementation
PMO Liabilities

description: UTCC International Journal of Business and Economics, 6, 1, 153-166
Growth, Nitrogen Fixation, and Spectral Attenuation in Cultivated Trichodesmium Species
Creators: name: The University of North Carolina at Chapel Hill University Libraries
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1993

description: Physiological studies of Trichodesmium species have been hindered by difficulties in maintaining actively growing, nitrogen-fixing cultures. Previous cultivation successes have not been widely duplicated. We present here a simple modified seawater medium and handling techniques which have been used to maintain actively growing Trichodesmium thiebautii in laboratory culture for over 1 year. The cultured population, isolated from coastal Atlantic waters, has a growth rate of 0.23 division day and exhibits light-dependent nitrogen fixation during exponential growth. Various morphologies, including solitary trichomes, and aggregates (spherical puffs and fusiform tufts) are present during growth. Spectral and scalar irradiance were measured within naturally occurring (coastal Atlantic) aggregates with small (diameter, 50 to 70 mum) spherical fiber-optic sensors. In contrast to naturally occurring puffs, cultivated Trichodesmium aggregates exhibited spectral properties consistent with low-light adaptation. Cultivated puff-type aggregates were also examined by using oxygen microelectrodes. The simple medium and approach used for cultivation should be easily reproducible and amenable to further manipulations and modifications useful for physiological studies of Trichodesmium spp. in culture.
VAFB-1984-15: Memorandum RE: Proposed San Antonio Creek Flood Control Project, VAFB, Initial Notes on a Preliminary Archaeological Assessment
Creators: name: Lauter, Gloria
Year: 1984

description: This Memorandum is in reply to a request for a preliminary assessment of archaeological work which may be required for the proposed San Antonio Creek Flood Control Project at VAFB. The project area was as yet undetermined, so mapping and recommendations are aimed at identifying archaeological work that may be needed in the general area.

Given the working project boundaries, nine archaeological sites are situated within the project area and will require assessment and evaluation to determine necessary mitigation measures.
Here Comes the STRAIN: Analyzing Defensive Pass Rush in American Football with Player Tracking Data
Creators: name: Nguyen, Quang
name: Yurko, Ronald
name: Matthews, Gregory J.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: In American football, a pass rush is an attempt by the defensive team to disrupt the offense and prevent the quarterback (QB) from completing a pass. Existing metrics for assessing pass rush performance are either discrete-time quantities or based on subjective judgment. Using player tracking data, we propose STRAIN, a novel metric for evaluating pass rushers in the National Football League (NFL) at the continuous-time within-play level. Inspired by the concept of strain rate in materials science, STRAIN is a simple and interpretable means for measuring defensive pressure in football. It is a directly-observed statistic as a function of two features: the distance between the pass rusher and QB, and the rate at which this distance is being reduced. Our metric possesses great predictability of pressure and stability over time. We also fit a multilevel model for STRAIN to understand the defensive pressure contribution of every pass rusher at the play-level. We apply our approach to NFL data and present results for the first eight weeks of the 2021 regular season. In particular, we provide comparisons of STRAIN for different defensive positions and play outcomes, and rankings of the NFL's best pass rushers according to our metric.
description: 12 figures, 7 tables
Quantum homomorphic encryption for circuits of low $T$-gate complexity
Creators: name: Broadbent, Anne
name: Jeffery, Stacey
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Fully homomorphic encryption is an encryption method with the property that any computation on the plaintext can be performed by a party having access to the ciphertext only. Here, we formally define and give schemes for quantum homomorphic encryption, which is the encryption of quantum information such that quantum computations can be performed given the ciphertext only. Our schemes allows for arbitrary Clifford group gates, but become inefficient for circuits with large complexity, measured in terms of the non-Clifford portion of the circuit (we use the "$π/8$" non-Clifford group gate, which is also known as the $T$-gate). More specifically, two schemes are proposed: the first scheme has a decryption procedure whose complexity scales with the square of the number of $T$-gates (compared with a trivial scheme in which the complexity scales with the total number of gates); the second scheme uses a quantum evaluation key of length given by a polynomial of degree exponential in the circuit's $T$-gate depth, yielding a homomorphic scheme for quantum circuits with constant $T$-depth. Both schemes build on a classical fully homomorphic encryption scheme. A further contribution of ours is to formally define the security of encryption schemes for quantum messages: we define quantum indistinguishability under chosen plaintext attacks in both the public and private-key settings. In this context, we show the equivalence of several definitions. Our schemes are the first of their kind that are secure under modern cryptographic definitions, and can be seen as a quantum analogue of classical results establishing homomorphic encryption for circuits with a limited number of multiplication gates. Historically, such results appeared as precursors to the breakthrough result establishing classical fully homomorphic encryption.
Identification of the Sources of Energy for Nitrogen Fixation and Physiological Characterization of Nitrogen-Fixing Members of a Marine Microbial Mat Community
Creators: name: The University of North Carolina at Chapel Hill University Libraries
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1993

description: Experimental manipulations of a microbial mat community were performed to determine sources of energy and reductant used for nitrogen fixation and to physiologically characterize the responsible diazotrophs. The dominant photolithotrophic members of this community were nonheterocystous cyanobacteria, but other potential nitrogen-fixing microorganisms were also present. Pronounced diel variability in rates of acetylene reduction was observed, with nighttime rates a factor of three to four higher than daytime rates. Acetylene reduction measured at night was dependent upon the occurrence of oxygenic photosynthesis the preceding day; mats incubated in the dark during the daytime reduced acetylene at rates comparable to those of light-incubated mats but were not able to reduce acetylene at the normally high rates the following night. The addition of various exogenous carbon compounds to these dark-incubated mats did not elicit nighttime acetylene reduction. Nighttime acetylene reduction apparently proceeds under anoxic conditions in these mats; the highest rates of acetylene reduction occur late at night. Additions of 3-(3,4-dichlorophenyl)-1,1-dimethylurea (an inhibitor of oxygenic photosynthesis) to mats resulted in a pronounced stimulation of acetylene reduction during the day, but acetylene reduction the next night proceeded at greatly reduced rates (relative to untreated mats). This daytime stimulation, under the 3-(3,4-dichlorophenyl)-1,1-dimethylurea-induced anoxic conditions in the experimentally treated mats, was light dependent. These results suggest that nitrogen fixation in these mats may be attributed to the activities of nonheterocystous cyanobacteria utilizing storage products of oxygenic photosynthesis under anoxic conditions at night.
Electron Geometry
Creators: name: Whitefoot, Alan D.
Publisher: name: Zenodo
Year: 2023
Subjects: electron geometry
toroidal electron
electron radii
Compton wavelength
fine structure constant
CMB temperature
Planck constant
electron orbit
atomic orbit
Bohr radius
Classical radius
Compton radius
Boltzmann constant
Microwave Background

description: There are three radii associated with the electron: The Bohr radius, Compton radius and Classical radius. These radii have never been associated with any physical electron geometry. A possible toroidal geometry is presented here, with connections to the Boltzmann constant and the Cosmic Microwave Background temperature.
description: pdf export from a Maple document
Pulmonary clearance and inflammatory response in C3H/HeJ mice after intranasal exposure to Pseudomonas spp.
Creators: name: The University of North Carolina at Chapel Hill University Libraries
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1993

description: The environmental release of engineered microorganisms has caused health and environmental concerns. In this study, an animal model was used to examine health effects following pulmonary exposure to environmental and clinical isolates. In order to rule out the possibility that an adverse response was caused by endotoxin, 50% lethal doses (LD50) were determined, when possible, with endotoxin-sensitive (C3HeB/FeJ) and endotoxin-resistant (C3H/HeJ) mice by using both environmental isolates (Pseudomonas aeruginosa BC16, BC17, BC18, and AC869 and Pseudomonas maltophilia BC6) and clinical isolates (P. aeruginosa PAO1 and DG1). The LD50 of strains AC869, DG1, and PAO1 are 1.05 x 10(7), 6.56 x 10(6), and 1.02 x 10(7) CFU, respectively, in C3HeB/FeJ mice and 1.05 x 10(7), 1.00 x 10(7), and 2.75 x 10(6) CFU, respectively, in C3H/HeJ mice. Strains BC17 and BC18 were not lethal to the animals. On the basis of the LD50 data, an appropriate sublethal dose (approximately 10(6) CFU) was selected. Animals were challenged intranasally with microorganisms, and clearance from the lungs and nasal cavity was determined. Strains BC17, BC18, and AC869 were not detected in lungs or nasal washes 14 days following treatment. Strains BC6, BC16, and DG1 were recovered from the nasal cavities at the end of the experiment. Only strain PAO1 was detected in lungs and in nasal cavities 14 days after treatment. At selected intervals following treatment, the percentages of polymorphonuclear leukocytes and lymphocytes in bronchoalveolar lavage samples were determined. P. aeruginosa AC869, PAO1, and DG1 elicited a relatively strong inflammatory response which was indirectly related to lung clearance.( TRUNCATED AT 250 WORDS)
Nonparametric Bayesian inference for multidimensional compound Poisson processes
Creators: name: Gugushvili, Shota
name: van der Meulen, Frank
name: Spreij, Peter
Publisher: name: arXiv
Year: 2014
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics

description: Given a sample from a discretely observed multidimensional compound Poisson process, we study the problem of nonparametric estimation of its jump size density $r_0$ and intensity $λ_0$. We take a nonparametric Bayesian approach to the problem and determine posterior contraction rates in this context, which, under some assumptions, we argue to be optimal posterior contraction rates. In particular, our results imply the existence of Bayesian point estimates that converge to the true parameter pair $(r_0,λ_0)$ at these rates. To the best of our knowledge, construction of nonparametric density estimators for inference in the class of discretely observed multidimensional Lévy processes, and the study of their rates of convergence is a new contribution to the literature.
description: Published at http://dx.doi.org/10.15559/15-VMSTA20 in the Modern Stochastics: Theory and Applications (https://www.i-journals.org/vtxpp/VMSTA) by VTeX (http://www.vtex.lt/)
Effective Electromagnetic Wave Properties of Disordered Stealthy Hyperuniform Layered Media Beyond the Quasistatic Regime
Creators: name: Kim, Jaeuk
name: Torquato, Salvatore
Publisher: name: arXiv
Year: 2023
Subjects: subject: Optics (physics.optics)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Disordered stealthy hyperuniform dielectric composites exhibit novel electromagnetic wave transport properties in two and three dimensions. Here, we carry out the first study of the electromagnetic properties of one-dimensional (1D) disordered stealthy hyperuniform layered media. From an exact nonlocal theory, we derive an approximation formula for the effective dynamic dielectric constant tensor ${\boldsymbol \varepsilon}_e({\bf k}_q,ω)$ of general 1D media that is valid well beyond the quasistatic regime and apply it to 1D stealthy hyperuniform systems. We consider incident waves of transverse polarization, frequency $ω$, and wavenumber $k_q$. Our formula for ${\boldsymbol \varepsilon}_e({k}_q,ω)$, which is given in terms of the spectral density, leads to a closed-form relation for the transmittance $T$. Our theoretical predictions are in excellent agreement with finite-difference time-domain (FDTD) simulations. Stealthy hyperuniform layered media have perfect transparency intervals up to a finite wavenumber, implying no Anderson localization, but non-stealthy hyperuniform media are not perfectly transparent. Our predictive theory provides a new path for the inverse design of the wave characteristics of disordered layered media, which are readily fabricated, by engineering their spectral densities.
description: 8 pages, 6 figures
MPEC 2023-U118 : 2023 UA2
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2023
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2023 UA2

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Simple method of concentrating enteroviruses and hepatitis A virus from sewage and ocean water for rapid detection by reverse transcriptase-polymerase chain reaction.
Creators: name: The University of North Carolina at Chapel Hill University Libraries
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1993

description: A rapid and simple method was developed to detect enteroviruses and hepatitis A virus (HAV) in sewage and ocean water. Sewage samples were concentrated by Centriprep-100 and Centricon-100 at 1,000 x g. Samples collected from estuary and near-shore surf zone ocean water in Southern California were concentrated by vortex flow filtration and microconcentration. Reverse transcriptase-polymerase chain reaction (RT-PCR), with enterovirus primers or HAV capsid-specific primers, was used to detect enteroviruses or HAV in all concentrated samples. A nonradioactive internal probe was used to confirm the amplified products. Results of seeding experiments indicated that at 4 degrees C, HAV was more persistent than poliovirus in seawater and both HAV and poliovirus persisted longer at 4 degrees C than at 25 degrees C. RT-PCR was at least 500-fold more sensitive than cell culture. Results were obtained within 5 h by RT-PCR, in contrast with the 5 days to 3 weeks required for cell culture.
VAFB-1985-07: Results of Archaeological Testing at SBa-212 and SBa-1145, Vandenberg Air Force Base, CA.
Creators: name: Gibson, Robert O.
Year: 1985
Subjects: subject: Santa Barbara (County)
valueUri: https://core.tdar.org/browse/geographic-keyword/3486/santa-barbara-county
subject: 06083 (Fips Code)
valueUri: https://core.tdar.org/browse/geographic-keyword/3487/06083-fips-code
subject: United States of America (Country)
valueUri: https://core.tdar.org/browse/geographic-keyword/384/united-states-of-america-country
subject: USGS QUAD Point Arguello 7.5'
valueUri: https://core.tdar.org/browse/geographic-keyword/16256/usgs-quad-point-arguello-75
subject: North America (Continent)
valueUri: https://core.tdar.org/browse/geographic-keyword/2890/north-america-continent
subject: California (State / Territory)
valueUri: https://core.tdar.org/browse/geographic-keyword/1484/california-state-territory
subject: CA-SBA-1145
valueUri: https://core.tdar.org/browse/site-name/119121/ca-sba-1145
subject: CA-SBA-212
valueUri: https://core.tdar.org/browse/site-name/93013/ca-sba-212
subject: Prehistory
valueUri: https://core.tdar.org/browse/other-keyword/511/prehistory
subject: Archeological Testing
valueUri: https://core.tdar.org/browse/other-keyword/1105/archeological-testing
subject: E-993
valueUri: https://core.tdar.org/browse/other-keyword/28660/e-993
subject: Archaeological Testing
valueUri: https://core.tdar.org/browse/other-keyword/1109/archaeological-testing
subject: 52 Pages
valueUri: https://core.tdar.org/browse/other-keyword/28661/52-pages
subject: SBA-212
valueUri: https://core.tdar.org/browse/other-keyword/28662/sba-212
subject: No Area Provided
valueUri: https://core.tdar.org/browse/other-keyword/10423/no-area-provided
subject: SBA-1145
valueUri: https://core.tdar.org/browse/other-keyword/28492/sba-1145
subject: Site Evaluation / Testing
valueUri: https://core.tdar.org/browse/investigation-type/10/site-evaluation-testing

description: This document is a Section 106 report for archaeological testing performed on the site CA-SBA-212 located on Vandenberg Air Force Base. The testing was performed in support of the proposed installation of a communication line between an area near Point Pedernales to an existing line west of Coast Road. The purpose of the testing was to assess the National Register eligibility of CA-SBA-212. The report details the excavation of the site and presents the results. Although the document focuses on CA-SBA-212, it also addresses the nearby site, CA-SBA-1145, that is also impacted by the project. The latter resource was previously determined eligible for the National Register. The report makes recommendations for the treatment of both resources.
Orbifold points on Prym-Teichmüller curves in genus three
Creators: name: Torres-Teigell, David
name: Zachhuber, Jonathan
Publisher: name: arXiv
Year: 2015
Subjects: subject: Algebraic Geometry (math.AG)
subject: Geometric Topology (math.GT)
subject: FOS: Mathematics

description: Prym-Teichmüller curves $W_D(4)$ constitute the main examples of known primitive Teichmüller curves in the moduli space $\mathcal{M}_3$. We determine, for each non-square discriminant $D>1$, the number and type of orbifold points in $W_D(4)$. These results, together with the formulas of Lanneau-Nguyen and Möller for the number of cusps and the Euler characteristic, complete the topological characterisation of Prym-Teichmüller curves in genus 3. Crucial for the determination of the orbifold points is the analysis of families of genus 3 cyclic covers of degree $4$ and $6$, branched over four points of $\mathbb{P}^1$. As a side product of our study, we provide an explicit description of the Jacobians and the Prym-Torelli images of these two families, together with a description of the corresponding flat surfaces.
description: 41 pages, 16 figures; for PARI files, see http://www.uni-frankfurt.de/50278800/Zachhuber. Rewrote introduction, updated references, fixed typos, improved exposition and added a section on flat geometry
VAFB-1985-15: Results of Archaeological Monitoring and Limited Subsurface Testing for the V-23 Space Shuttle Launch Site Patrol Roads C and D, Vandenberg Air Force Base, CA
Creators: name: Harmsworth Associates
name: Gibson, Robert O.
Year: 1985

description: This document is a Section 106 inventory report discusses the results of monitoring and testing for construction activities associated with the V-23 Patrol Roads C and D. A total of 39 stone artifacts were recovered from Road C and 1 stone artifact was recovered from Road D during construction monitoring. A total of 10 shovel test units were excavated in the vicinity of where archaeological materials were unearthed and two new archaeological sites were identified. The two sites probably represent Early Period (3000 to 70000 BP) camp sites and probably still contain important information about land use settlement patterns during the Early Period in the Chumash cultural sequence.
Polarization response of spin-lasers under amplitude modulation
Creators: name: Xu, Gaofeng
name: Patel, Krish
name: Zutic, Igor
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Lasers with injected spin-polarized carriers show an outstanding performance in both static and dynamic operation. In addition to the intensity response of conventional lasers, without spin-polarized carriers, both intensity and polarization of light can be exploited for optical communication in spin-lasers. However, the polarization dynamics of spin-lasers under amplitude modulation has been largely overlooked. Here we reveal, analytically and numerically, a nontrivial polarization response that accompanies the well-known intensity dynamics of a spin-laser under amplitude modulation. We evaluate the polarization and intensity response under the same amplitude modulation, and further assess the capability of such a polarization response in digital data transfer with eye diagram simulations. Our results provide a more complete understanding of the modulation response in spin-lasers and open up unexplored opportunities in optical communication and spintronics.
description: 7 pages, 4 figures, Applied Physics Letters in press
Das Volk Gottes braucht "Christen-Mut"
Creators: name: Bommer, Josef
name: Mette, Norbert
name: Klein, Ingrid
name: Niewiadomski, Josef
Publisher: name: Diakonia
Year: 1970

description: Diakonia, Bd. 23 Nr. 5 (1992): Diakonia, Band 23, Heft 5
PHIRI - WP6 - Use Case D Common Data Model
Creators: name: Rodriguez-Blazquez, Carmen
name: Tolonen, Hanna
Publisher: name: Zenodo
Year: 2021
Subjects: mental health
health care utilization
covid-19

description: Technical notes and documentation on the common data model of PHIRI Use Case D (WP6) measuring changes in mental health and health care utilization by mental health patients as an indirect effect of the COVID-19 pandemic The ZIP file includes: - A spreadsheet in EXCEL format with the data model specification for the use case - An HTML document with a description of Use Case A including the metadata of the data model - A JSON file in schema.org format including the metadata on the data model in a machine-readable format - A CSV file with a synthetic data set produced following the specifications of the use case data model for testing purposes
MPEC 2023-U119 : 2023 UB2
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2023
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2023 UB2

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Optimization's Neglected Normative Commitments
Creators: name: Laufer, Benjamin
name: Gilbert, Thomas Krendl
name: Nissenbaum, Helen
Publisher: name: arXiv
Year: 2023
Subjects: subject: Artificial Intelligence (cs.AI)
subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences

description: Optimization is offered as an objective approach to resolving complex, real-world decisions involving uncertainty and conflicting interests. It drives business strategies as well as public policies and, increasingly, lies at the heart of sophisticated machine learning systems. A paradigm used to approach potentially high-stakes decisions, optimization relies on abstracting the real world to a set of decision(s), objective(s) and constraint(s). Drawing from the modeling process and a range of actual cases, this paper describes the normative choices and assumptions that are necessarily part of using optimization. It then identifies six emergent problems that may be neglected: 1) Misspecified values can yield optimizations that omit certain imperatives altogether or incorporate them incorrectly as a constraint or as part of the objective, 2) Problematic decision boundaries can lead to faulty modularity assumptions and feedback loops, 3) Failing to account for multiple agents' divergent goals and decisions can lead to policies that serve only certain narrow interests, 4) Mislabeling and mismeasurement can introduce bias and imprecision, 5) Faulty use of relaxation and approximation methods, unaccompanied by formal characterizations and guarantees, can severely impede applicability, and 6) Treating optimization as a justification for action, without specifying the necessary contextual information, can lead to ethically dubious or faulty decisions. Suggestions are given to further understand and curb the harms that can arise when optimization is used wrongfully.
description: 14 pages, 1 figure, presentation at FAccT23
Competitive metabolism of naphthalene, methylnaphthalenes, and fluorene by phenanthrene-degrading pseudomonads.
Creators: name: The University of North Carolina at Chapel Hill University Libraries
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1995

description: Polynuclear aromatic hydrocarbons (PAHs) typically exist as complex mixtures in contaminated soils, yet little is known about the biodegradation of PAHs in mixtures. We have isolated two physiologically diverse bacteria, Pseudomonas stutzeri P-16 and P. saccharophila P-15, from a creosote-contaminated soil by enrichment on phenanthrene as the sole carbon source and studied their ability to metabolize several other two- and three-ring PAHs. Naphthalene, 1-methylnaphthalene, and 2-methylnaphthalene served as growth substrates for both organisms, while fluorene was only cometabolized. We also studied the effects of these compounds on initial rates of phenanthrene uptake in binary mixtures. Lineweaver-Burk analysis of kinetic measurements was used to demonstrate competitive inhibition of phenanthrene uptake by all four compounds, suggesting that multiple PAHs are being transformed by a common enzyme pathway in whole cells. Estimates of the inhibition coefficient, Ki, are reported for each compound. The occurrence of competitive metabolic processes in physiologically diverse organisms suggests that competitive metabolism may be a common phenomenon among PAH-degrading organisms.
title: Quelle réforme pour le revenu de solidarité active et la Prime pour l'emploi ? (Débats du LIEPP, n°1)
Creators: name: Duvoux, Nicolas
name: Palier, Bruno
name: Gomel, Bernard
name: Dominique, Méda
name: Wasmer, Etienne
name: Allegre, Guillaume
Publisher: name: Sciences Po - LIEPP
Year: 2014
Subjects: subject: FOS: Social sciences
valueUri: http://www.oecd.org/science/inno/38235147.pdf

description: Alors qu’il est depuis longtemps question de réformer les aides à l’emploi destinées aux salariés les moins bien rémunérés, la difficulté récemment rencontrée par le gouvernement pour baisser les cotisations sociales salariées sur les bas salaires (mesure censurée par le Conseil constitutionnel) a relancé le débat sur les réformes des dispositifs existants pour les plus bas revenus : la Prime pour l’emploi et le revenu de solidarité active. Dans le cadre des réflexions du LIEPP sur l’évaluation de l’usage de la fiscalité à des fins de politiques sociales, nous publions ci-après trois textes définissant trois orientations possibles pour les réformes du RSA et de la PPE. Ces textes sont issus d’une journée d’études organisée le 29 janvier 2014, intitulée « Le contribuable et l’assisté. Le débat RSA/PPE entre principes et paramètres ». Ils s’intéressent aux enjeux de l'utilisation de la fiscalité dans le soutien à l'activité des travailleurs modestes mais aussi aux profondes limites du système actuel. La France a, depuis 2000, développé un impôt négatif, d’abord sous la forme de la prime pour l’emploi (PPE) puis comme un élément du Revenu de Solidarité active. Il s’agit ici bien d’une dépense fiscale à visée de politique d'emploi et de politique sociale. Plusieurs éléments invitent en effet à interroger la cohérence et l'efficacité des choix retenus : les caractéristiques propres du RSA ainsi que le non-recours massif à sa composante activité, ont conduit à une réflexion sur la question. De son côté, la PPE, dont le barème a été gelé, pose un problème de répartition. Distribuée largement, elle souffre de « saupoudrage » et d'une faible réactivité. Prenant acte de ces faiblesses structurelles croisées des deux dispositifs destinés à soutenir les travailleurs modestes, le rapport remis par le député Christophe Sirugue au Premier Ministre à l'été 2013 a proposé une « prime d'activité » fusionnant la PPE et le RSA activité.Alors que la réduction des cotisations sociales salariées pour les salaires entre 1 et 1,3 SMIC a été privilégiée pour « rendre le travail payant » ou du moins plus attractif, en bas de l’échelle des salaires, une décision du Conseil Constitutionnel du 06/08/2014 , rejetant une telle baisse au motif d’une méconnaissance du principe d’égalité devant la loi a remis la question de la fusion RSA / PPE à l’ordre du jour ? Comment répondre de la manière la plus efficace à un défi créé par la faiblesse des salaires d’un côté, l’incohérence et les échecs des politiques publiques de l’autre ?
VAFB-1984-08: Data Recovery Plan, SBa-1060, Peacekeeper Program, Roads and Utilities, Phase I, Vandenberg AFB, California
Creators: name: US Air Force, AFRCE-BMS
Year: 1984

description: This document is a data recovery plan for CA-SBA-1060 that was affected by the Peacekeeper Rail Garrison Program. The program was to construct and operate Peacekeeper Missile Program test facilities includes Roads and Utilities components. Phase 1 involves four elements: 1) the modification of 12 overhead utilities along El Rancho road, 2) upgrading of the El Rancho Road - Umbra Road intersection, 3) construction of an at-grade crossing of the Southern Pacific Railroad by El Rancho Road, and 4) temporary by-pass of an existing box culvert at the El Rancho Road-Point Sal Road intersection. Three of the overhead utility modifications are planned within or adjacent to an archaeological site (Sba-1060) that has been determined to be eligible for listing on the NRHP.

Monitoring scheduled in conjunction with construction is not adequate to mitigate adverse impacts to this resource. Construction in this area will involve intense, localized ground disturbance, precluding avoidance and requiring data recovery as part of mitigation. This document provides the framework and procedures within which mitigative archaeological data recovery will be accomplished. 

The data recovery plan has been developed so as to accommodate the widest possible range of construction scenarios. Consequently, discussions of recovery, analysis, and reporting measures are kept at a relatively general level; however, detail is provided where little possibility of later contradictory action exists.
Nonnegative Morse polynomial functions and polynomial optimization
Creators: name: Lê, Công-Trình
Publisher: name: arXiv
Year: 2014
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 11E25, 13J30, 14H99, 14P05, 14P10, 90C22

description: In this paper we study the representation of Morse polynomial functions which are nonnegative on a compact basic closed semi-algebraic set in $\mathbb R^n$, and having only finitely many zeros in this set. Following C. Bivià-Ausina, we introduce two classes of non-degenerate polynomials for which the algebraic sets defined by them are compact. As a consequence, we study the representation of nonnegative Morse polynomials on these kinds of non-degenerate algebraic sets. Moreover, we apply these results to study the polynomial optimization problem for Morse polynomial functions.
description: Title changed, one reference added and one reference deleted. To appear in Positivity. Dedicated to Professor H\`{a} Huy Vui on the occasion of his 65th birthday. in Positivity (2016)
Mixture Proportion Estimation Beyond Irreducibility
Creators: name: Zhu, Yilun
name: Fjeldsted, Aaron
name: Holland, Darren
name: Landon, George
name: Lintereur, Azaree
name: Scott, Clayton
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (stat.ML)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: The task of mixture proportion estimation (MPE) is to estimate the weight of a component distribution in a mixture, given observations from both the component and mixture. Previous work on MPE adopts the irreducibility assumption, which ensures identifiablity of the mixture proportion. In this paper, we propose a more general sufficient condition that accommodates several settings of interest where irreducibility does not hold. We further present a resampling-based meta-algorithm that takes any existing MPE algorithm designed to work under irreducibility and adapts it to work under our more general condition. Our approach empirically exhibits improved estimation performance relative to baseline methods and to a recently proposed regrouping-based algorithm.