gebhart/patrepeval huggingface dataset:
Transient and steady-state electrical conductivity of paper impregnated with synthetic oil as insulation for extra-high-voltage direct-current oil-filled cables (1967)

It has been shown <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sup> that the distribution of the gradient in a dielectric under dc conditions generally depends on the rate of the voltage variation. This fact has already been studied in connection with a voltage polarity reversal <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1,2</sup> in extra-high-voltage dc power cables, but it can also be of importance to define a correct testing procedure for the same cables. Conversely, an analysis of the transient behavior of the dielectric may also be useful from a physical point of view, in order to get a deeper knowledge of the phenomena involved.
SIGNIFICADO ESTRATIGRÁFICO DOS MINERAIS PESADOS EM DEPÓSITOS CENOZOICOS DA PARTE EMERSA DA BACIA PARAÍBA, BRASIL. (2013)

Controversias na estratigrafia dos depositos expostos na Bacia Paraiba orientaram a realizacao de analises de minerais pesados e de morfologia de zircao e turmalina. A analise dos minerais pesados mostrou grande similaridade mineralogica entre as unidades aflorantes, com dominio de zircao, turmalina, cianita e rutilo. A analise multivariada mostrou uma grande dispersao dos dados e aponta para a impossibilidade de separar estes depositos atraves da mineralogia. A integracao dos dados mineralogicos e de datacoes de luminescencia de quartzo e de U-Th/He em goetita sugere a ocorrencia exclusiva de depositos siliciclasticos cenozoicos no Estado da Paraiba. A granulometria mostra relacao com a estratigrafia, ou seja, a maioria das amostras da Formacao Barreiras associa-se as amostras mais peliticas, enquanto que as amostras dos Depositos Pos-Barreiras relacionam-se com as amostras mais arenosas. Maior refinamento estratigrafico foi obtido atraves das analises morfologicas de zircao e de turmalina, as quais mostraram-se eficientes na diferenciacao das unidades sedimentares estudadas, com aumento das categorias arredondadas em direcao as unidades mais jovens. Alem disso, o aumento progressivo do ZTR na direcao das unidades mais jovens, aliada a constância dos valores do indice de proveniencia RZi sugerem que as principais fontes dos depositos cenozoicos da Bacia Paraiba foram rochas sedimentares preexistentes, e subordinadamente, rochas metamorficas da Zona Transversal da Provincia Borborema.
Equilibrium and kinetic constants for the thiol-disulfide interchange reaction between glutathione and dithiothreitol. (1992)

The equilibrium and rate constants for the reaction between oxidized and reduced glutathione and oxidized and reduced dithiothreitol have been determined at several pH values and temperatures. The measurements involve approach to equilibrium from both directions, quenching of the reaction by lowering the pH or by addition of methyl methanethiosulfonate, separation of reactants and products by reverse-phase HPLC, and determination of their concentrations. Analysis of reaction mixtures was carried out at various times to assure that equilibrium had been reached and to determine kinetic constants prior to the attainment of equilibrium.
Sexual differences in the metabolism of salicylates. (1975)

During 6 h the plasma level of salicylates was followed after oral administration of aspirin. The plasma levels of salicylic acid were significantly lower in bull than in heifer calves during the whole observation period. The toxicity of the drug was higher in female animals.
Levels of pyrimethamine in sera and cerebrospinal and ventricular fluids from infants treated for congenital toxoplasmosis. Toxoplasmosis Study Group (1992)

Pyrimethamine levels in sera, cerebrospinal fluid (CSF), and ventricular fluid were measured by using reversed-phase high-pressure liquid chromatography. The specimens were from 37 infants receiving pyrimethamine for treatment of suspect or proven congenital toxoplasmosis. Pyrimethamine half-life in serum was 64 +/- 12 h when determined by study of terminal-phase kinetics of samples obtained from nine babies. This half-life was significantly different (P = 0.008) from the pyrimethamine half-life (33 +/- 12 h) determined by terminal-phase kinetics for two babies of the same age taking phenobarbital. Serum pyrimethamine levels at various intervals after dosages of pyrimethamine were also lower for infants receiving phenobarbital. Levels measured in sera from babies taking the same dose of pyrimethamine throughout their first year of life did not appear to vary significantly over time or at different ages (P greater than 0.05). Mean +/- standard deviation serum levels 4 h after a pyrimethamine dose were 1.297 +/- 0.54 micrograms/ml for babies taking 1 mg of pyrimethamine per kg of body weight daily and 0.7 +/- 0.26 microgram/ml for babies taking 1 mg/kg each Monday, Wednesday, and Friday. Levels in CSF were approximately 10 to 25% of concomitant levels in serum. Serum folate levels for infants who took 0.64 to 1.7 mg leukovorin per kg ranged from 33 to 663 ng/ml. To determine whether the levels of pyrimethamine in serum and CSF of treated infants were in a range that affected the most virulent, rapidly replicating, and standard laboratory strain of Toxoplasma gondii, effects of various concentrations of pyrimethamine and sulfadiazine on replication of T. gondii in vitro were assessed. The levels of the antimicrobial agents effective in vitro were in the range of levels of pyrimethamine achieved in sera and CSF. Although folinic acid could inhibit the therapeutic effect of pyrimethamine and sulfadiazine in vitro, inhibition was noted only at levels (> or = 4,800 ng/ml) that were considerably higher than the folate levels found in the treated infants' sera.
New Chemical Insights Using Weakly Supported Voltammetry: The Reductive Cleavage of ArylBr Bonds is Reversible (2012)

Cyclic voltammetry carried out at a wide range of supporting electrolyte concentrations and compositions can elucidate additional kinetic and mechanistic details of the electrochemical reduction of aryl halides. The cleavage of the C-Br bond is reversible, driven by H abstraction and the second electron transfer. This is a new chemical insight, as the cleavage of such bonds has usually been regarded as irreversible.
Novel method of pre-determining induction machine parameters and energetic efficiency (2013)

The efficiency concept becomes present at all levels of electric motors design, manufacturing and repairing activity. New legislations including Energy Independence Security Act and similar will effectively impose a new design constraint: efficiency of induction machines (IM). Various motor management programs promoted by the utilities, new standards will also closely monitor efficiency of the repaired motors. Proposed method covers the need of a rapid and effective evaluation of energetic efficiencies of new (including preliminary designs or prototypes) and/or rewound IM. Based on the d-q orthogonal Park model, differential equations modeling IM parameters are written. An original mathematical approach is used to determine the existence domain of the machine parameters, with direct estimation of energy efficiency domain as a function of IM parameters. The work presented in this paper has been done without considering non-sinusoidal power supply conditions and magnetic saturation. These topics, in the context of efficiency estimation, will make the subject of future published research. Proposed algorithm (MEMPE) was validated during pre-design process of dedicated IM for special applications. It was also used to pre-determine the new values of parameters of the rewound IM. Practical implications of this work are described with all their benefits for customers, utility programs, IM designers and service centers implementing new methodology for efficient repairs/rewinds of IM. This paper is a step into laborious work in finding analytical expressions that would allow efficiency estimation by non intrusive site measurements, without any need of performing costly dynamometer tests.
Laboratory testing of West Valley reference 6 glass (1995)

A series of laboratory tests is being conducted to characterize the corrosion of West Valley reference 6 glass (WV6) and to provide parametric values for modeling its long-term durability. Models require measurement of the corrosion rate in the absence of corrosion products and in fluids that are {open_quotes}saturated{close_quotes} with corrosion products, and the identification of alteration phases. Corrosion rates in dilute and saturated conditions were measured using MCC-1 and PCT tests, respectively. Vapor hydration tests were performed to generate secondary phases. The PCT tests show the WV6 glass to be more durable than SRL EA, SRL 202, and HW-39-1 glasses. Vapor hydration tests show weeksite (a uranyl silicate), a potassium-bearing zeolite, analcime, potassium feldspar, a calcium silicate phase, and lithium phosphate to form as WV6 glass corrodes. Test results are presented and their relevance to long-term performance discussed.
Resolution of two apparent paradoxes concerning quantum oscillations in underdoped high-Tcsuperconductors (2009)

Recent quantum-oscillation experiments in underdoped high-temperature superconductors seem to imply two paradoxes. The first paradox concerns the apparent nonexistence of the signature of the electron pockets in angle-resolved photoemission spectroscopy (ARPES). The second paradox is a clear signature of a small electron pocket in quantum-oscillation experiments, but no evidence as yet of the corresponding hole pockets of approximately double the frequency of the electron pocket. This hole pockets should be present if the Fermi-surface reconstruction is due to a commensurate density wave, assuming that Luttinger sum rule relating the area of the pockets and the total number of charge carriers holds. Here we provide possible resolutions of these apparent paradoxes from the commensurate $d$-density wave theory. To address the first paradox we have computed the ARPES spectral function subject to correlated disorder, natural to a class of experiments relevant to the materials studied in quantum oscillations. The intensity of the spectral function is significantly reduced for the electron pockets for an intermediate range of disorder correlation length, and typically less than half the hole pocket is visible, mimicking Fermi arcs. Next we show from an exact transfer-matrix calculation of the Shubnikov-de Haas oscillation that the usual disorder affects the electron pocket more significantly than the hole pocket. However, when, in addition, the scattering from vortices in the mixed state is included, it wipes out the frequency corresponding to the hole pocket. Thus, if we are correct, it will be necessary to do measurements at higher magnetic fields and even higher-quality samples to recover the hole-pocket frequency.
ChemInform Abstract: Use of the Me3Sn Function as a Readily Removable ′Anchoring′ Group in the Synthesis of Enantiomerically Pure Bicyclic Alcohols and Ketones. (1992)

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Field determination of vertical permeability to air in the unsaturated zone (1978)

The vertical permeability to air of layered materials in the unsaturated zone may be determined from air pressure data obtained at depth during a period when air pressure is changing at land surface. Such data may be obtained by monitoring barometric pressure with a microbarograph or surveying altimeter and simultaneously measuring down-hole pneumatic head differences in specially constructed piezometers. These data, coupled with air-filled porosity data from other sources, may be compared with the results of electric-analog or numerical solution of the one-dimensional diffusion equation to make a trial-and-error determination of the air permeability for each layer. The permeabilities to air may in turn be converted to equivalent hydraulic conductivity values if the materials are well drained, are permeable enough that the Klinkenberg effect is small, and are structurally unaffected by wetting.
Recent progress in enantiomer separation by capillary electrochromatography (2000)

Enantiomer separation by electrochromatography (CEC) can be performed in three modes: (i) open-tubular capillary electrochromatography (o-CEC), in which the chiral selector is physically adsorbed coated, and thermally immobilized or covalently attached to the internal capillary wall; (ii) packed capillary electrochromatography (p-CEC), in which the capillary is either filled with chiral modified silica particles or with an achiral packing material, and a chiral selector is added to the mobile phase; and (iii) monolithic (rod)-capillary electrochromatography (rod-CEC) in which the chiral stationary phase (CSP) consists of a single piece of porous solid. We present an overview on methods and new trends in the field of electrochromatographic enantiomer separation such as CEC with either nonaqueous mobile phases or stationary phases with incorporated permanent charges, or with packing beds consisting of nonporous silica particles or particles with very small internal diameters.
A Design Space for Context-Sensitive User Interfaces. (2005)

In this work, the two-dimensional self-assembly and co-assembly behaviors of two tetracarboxylic acid derivatives (H<sub>4</sub>BDETP and H<sub>4</sub>BTB) were investigated by scanning tunneling microscopy (STM). H<sub>4</sub>BDETP molecules self-assembled into linear nanostructures, and H<sub>4</sub>BTB molecules formed lamellar and tetragonal nanostructures. The formation of a H<sub>4</sub>BDETP/H<sub>4</sub>BTB co-assembly nanostructure was closely related to the deposition sequence of H<sub>4</sub>BDETP and H<sub>4</sub>BTB on highly oriented pyrolytic graphite (HOPG). The introduction of H<sub>4</sub>BTB into the self-assembly system of H<sub>4</sub>BDETP resulted in the emergence of the H<sub>4</sub>BDETP/H<sub>4</sub>BTB nanostructure, while the addition of H<sub>4</sub>BDETP had no effect on the self-assembly system of H<sub>4</sub>BTB and a H<sub>4</sub>BDETP/H<sub>4</sub>BTB co-assembly nanostructure was not obtained.
Purification of P-TEFb, a Transcription Factor Required for the Transition into Productive Elongation (1995)

Production of full-length runoff transcripts in vitro and functional mRNA in vivo is sensitive to the drug 5,6-dichloro-1-beta-D-ribofuranosylbenzimidazole (DRB). We previously proposed the existence of an activity, P-TEF (positive transcription elongation factor) that functions in a DRB-sensitive manner to allow RNA polymerase II elongation complexes to efficiently synthesize long transcripts (Marshall, N. F. and Price, D. H. (1992) Mol. Cell. Biol. 12, 2078-2090). We have fractionated nuclear extracts of Drosophila melanogaster Kc cells and identified three activities, P-TEFa, factor 2, and P-TEFb, that are directly involved in reconstructing DRB-sensitive transcription. P-TEFb is essential for the production of DRB-sensitive long transcripts in vitro, while P-TEFa and factor 2 are stimulatory. P-TEFb activity is associated with a protein comprising two polypeptide subunits with apparent molecular masses of 124 and 43 kDa. Using a P-TEFb-dependent transcription system, we show that P-TEFb acts after initiation and is the limiting factor in the production of long run-off transcripts.
Interfacial Self-assembly of Sugar-based Amphiphiles: Solid- and Liquid-core Capsules (2009)

Sugar-swollen reverse micelles and alternating polymer vesicles were prepared to examine interfacial self-assembly of both small and macromolecular sugar-based amphiphiles. Anhydrous, glassy sugar-sucrose laurate mixtures spontaneously dissolve in hydrocarbon oil at moderate temperatures and form sugar-swollen reverse micelles. The size of the micelles and the microemulsion viscosity depend on the mass ratio of sugar to surfactant. As sugar loading increases, the micelles increase in size and bulk viscosity decreases. Formation of sugar-oil complex fluids is related to the dynamics of the sugar in the supercooled liquid state, investigated by modulated differential scanning calorimetry. Alternating polymers of N-n-alkylmaleimides and vinyl gluconamide spontaneously form ultra small (10 to 20 nm) and medium (50 to 300 nm) sized vesicles when dissolved in water at room temperature. These materials have molecular weights approximately one hundred times higher than alternating oligomers of alkylmaleate and vinyl ether monomers, and demonstrate conclusively that alternating copolymers can form vesicles. The size and shape of the vesicles are characterized thoroughly by cryogenictransmission electron microscopy (cryo-TEM), dynamic light scattering (DLS), and small angle neutron scattering (SANS). The copolymer vesicles exhibit alkyl chain length dependent release characteristics and bilayer thickness (1.7, 2.0, and 2.6 nm for alkyl chains of 10, 12, and 14 carbons, respectively). These nonionic alternating polymers contain no evident acidic or basic groups yet exhibit pH reversible self-assembly. The polymers form vesicles spontaneously in
SEISMIC RETROFITTING OF SULTAN MURAT MOSQUE’ CLOCK TOWER IN SKOPJE USING INNOVATIVE MATERIALS (2023)

The structure of the Clock Tower in Skopje is massive, constructed of stone masonry with a height of about 29 meters and brick masonry in the upper octagonal part. It was damaged during the Skopje Earthquake in 1963. A rehabilitation of the structure was carried out in 1964, but without a seismic strengthening. Recently, field investigations were carried out and a three-dimensional analysis of the structure in its actual state for gravitational and seismic forces was performed. It has been concluded that it is necessary to perform protective interventions to ensure longer-term protection, stability and further existence in the form of repair of existing structural damage, structural consolidation, repair of damaged timber elements and strengthening. To improve the behaviour and resistance to dynamic impacts, a technical solution for consolidation and retrofitting has been proposed. The basic concept consists of existing structural damage rehabilitation, structural consolidation with systemic injection, rehabilitation of load-bearing wooden beams and braces and strengthening the whole structure. Due to the specificity of the structure of the Clock Tower in terms of its shape, used material, structural system and the type of structural elements, as well as its importance as a cultural and historical heritage, which requires respect of certain conservation principles and rules, the options for rehabilitation and strengthening are strictly limited. It excludes inserting new structural elements that would provide sufficient ductility during maximum expected earthquakes. The rehabilitation and strengthening were carried out with innovative composite materials that were experimentally verified, but never applied before. The analysis results show that the retrofitted structure can withstand the maximum expected seismic loads according to the actual technical regulations.
A Study on MIMO Interference Canceller for Reverse-Link in HAPS Multi-Gateways (2020)

HAPS (High Altitude Platform Station), which is a stratosphere platform around 20Km altitude, cellular communication service makes it possible to directly communicate among ordinary land cellular phones. HAPS is also a promising system for service area expansions as well as reliable communication methods at various natural disasters. HAPS communication system is composed of service links which provide communications between HAPS and land cellular phones and a feeder link which establishes a communication between HAPS and a base station (Gateway). The authors proposed a "Multi-Gateway System" that performs spatial multiplexing at the same frequency for effectively use the frequency of the feeder link. It was shown that the communication quality can be greatly improved by applying interference canceller technology to the forward link from Multi-Gateway to HAPS. We have to improve the quality of communication by reducing the interference at Reverse-Link as same as Forward-Link in order to apply M-GS. In this paper, we propose a new transmission interference canceller technology for the reverse link from HAPS to multi-GW, and clarify the improvement effect of communication quality.
Growth Characteristics of Alkhumra Hemorrhagic Fever Virus in Mammalian Cell Lines (2016)

The growth curve studies showed that AHFV can propagate in the four types of cell lines to variable titers. LLC-MK2 cells are superior to MDCK, Vero, and HEP-2 for propagation of AHFV.
Neurostimulation System Used for Deep Brain Stimulation (DBS) (2004)

The use of magnetic resonance imaging (MRI) in patients with neurostimulation systems used for deep brain stimulation requires the utmost care, and no individual should undergo an MR examination in the absence of empirical evidence that the procedure can be performed safely. The risks of performing MRI in patients with neurostimulators include those associated with heating, magnetic field interactions, induced currents, and the functional disruption of these devices. The exact safety recommendations for the particular neurostimulation system with regard to the pulse generator, leads, electrodes, operational conditions for the device, the positioning of these components, and the MR system conditions must be carefully followed for MRI. As highlighted by 2 recent accidents, the failure to strictly follow safety recommendations (eg, use a 1.5-T MR system with a send/receive head radiofrequency coil only; limit the specific absorption rate to 0.4 W/kg; etc.) may result in serious, temporary, or permanent injury to the patient including the possibility of transient dystonia, paralysis, coma, or even death.
Lewis acid induced ene cyclization of .omega.-olefinic trifluoromethyl ketones: access to bicyclic compounds bearing a trifluoromethyl group (1991)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLewis acid induced ene cyclization of .omega.-olefinic trifluoromethyl ketones: access to bicyclic compounds bearing a trifluoromethyl groupAhmed Abouabdellah, Jean Pierre Begue, Daniele Bonnet-Delpon, and Thierry LequeuxCite this: J. Org. Chem. 1991, 56, 20, 5800–5808Publication Date (Print):September 1, 1991Publication History Published online1 May 2002Published inissue 1 September 1991https://pubs.acs.org/doi/10.1021/jo00020a021https://doi.org/10.1021/jo00020a021research-articleACS PublicationsRequest reuse permissionsArticle Views284Altmetric-Citations23LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-AlertscloseSupporting Info (1)»Supporting Information Supporting Information Get e-Alerts