gebhart/patrepeval huggingface dataset:
Control of DFIG under Unsymmetrical Voltage Dip (2007)

Today, doubly fed induction generator (DFIG) gains the dominant market power in the wind energy industry. It provides the benefits of variable speed operation cost-effectively, and can control its active and reactive power independently. Crowbar protection is often adopted to protect the rotor side voltage source converter (VSC) from transient over current during grid voltage dip. But under unsymmetrical voltage dip, the severe problems are not the transient over current, but the electric torque pulsation and DC voltage ripple in the back to back VSCs. This paper develops dynamic models in Matlab/Simulink, investigates the behavior of DFIG during an unsymmetrical voltage dip, and proposes new controllers in separated positive and negative sequence. Methods to separate positive and negative sequence components in real time are also developed, and their responses to unsymmetrical voltage dip are compared. Simulation results prove that the separated positive and negative sequence controller limit the torque pulsation and DC voltage ripple effectively.
Microparasellidae (Isopoda, Asellota) from Bonaire (1977)

During a study still in progress on the fauna of phreatic waters of various West Indian islands, a number of isopods of the family Microparasellidae were obtained. Although material from some 20 Caribbean islands was examined, only the island of Bonaire yielded microparasellid isopods so far. These animals are described in the present paper. Up to now, the only other West Indian records for the family are those of COINEAU & BOTOSANEANU, 1973, from Cuba.\nThe methods employed are the same as in my previous study (STOCK, 1976a) on the Antillean Thermosbaenacea. All chlorinities have been determined with the aid of an E.E.L. electric chlorinimeter.
Velocity tapering in microwave amplifiers (1965)

The low-to-moderate RF conversion efficiencies characteristic of kinetic energy conversion devices may be enhanced by appropriately tapering the RF circuit phase velocity. The nonlinear interaction equations have been solved in closed form for an HKB (hard-kernel-bunch) model to obtain an optimum taper form. Several velocity taper forms have been investigated in experimental amplifiers and the power output, gain, efficiency, and phase shift characteristics of these amplifiers are discussed in detail. Conversion efficiencies up to 50 percent and near constant output power for a 20-dB variation in RF drive power have been realized in near optimally tapered circuit amplifiers. Further improvements realized include operation at a single voltage for maximum gain and power output and a nearly linear phase shift characteristic for a ±10 percent voltage modulation.
High Density Lipoprotein Prevents Oxidized Low Density Lipoprotein-induced Inhibition of Endothelial Nitric-oxide Synthase Localization and Activation in Caveolae (2000)

Oxidized LDL (oxLDL) depletes caveolae of cholesterol, resulting in the displacement of endothelial nitric-oxide synthase (eNOS) from caveolae and impaired eNOS activation. In the present study, we determined if the class B scavenger receptors, CD36 and SR-BI, are involved in regulating nitric-oxide synthase localization and function. We demonstrate that CD36 and SR-BI are expressed in endothelial cells, co-fractionate with caveolae, and co-immunoprecipitate with caveolin-1. Co-incubation of cells with 10 microgram/ml high density lipoprotein (HDL) prevented oxLDL-induced translocation of eNOS from caveolae and restored acetylcholine-induced nitric-oxide synthase stimulation. Acetylcholine caused eNOS activation in cells incubated with 10 microgram/ml oxLDL (10-15 thiobarbituric acid-reactive substances) and blocking antibodies to CD36, whereas cells treated with only oxLDL were unresponsive. Furthermore, CD36-blocking antibodies prevented oxLDL-induced redistribution of eNOS. SR-BI-blocking antibodies were used to demonstrate that the effects of HDL are mediate by SR-BI. HDL binding to SR-BI maintained the concentration of caveola-associated cholesterol by promoting the uptake of cholesterol esters, thereby preventing oxLDL-induced depletion of caveola cholesterol. We conclude that CD36 mediates the effects of oxLDL on caveola composition and eNOS activation. Furthermore, HDL prevents oxLDL from decreasing the capacity for eNOS activation by preserving the cholesterol concentration in caveolae and, thereby maintaining the subcellular location of eNOS.
Robert L. McWilliams (1955)

News| December 01 1955 Robert L. McWilliams Louis E. Goodman Louis E. Goodman Search for other works by this author on: This Site PubMed Google Scholar California Historical Society Quarterly (1955) 34 (4): 378. https://doi.org/10.2307/25155022 Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Cite Icon Cite Search Site Citation Louis E. Goodman; Robert L. McWilliams. California Historical Society Quarterly 1 December 1955; 34 (4): 378. doi: https://doi.org/10.2307/25155022 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentCalifornia History Search This content is only available via PDF. Copyright 1955 The California Historical Society Article PDF first page preview Close Modal You do not currently have access to this content.
Les conventions régionales sur la conservation de la nature et des ressources naturelles en Afrique et leur mise en œuvre (1991)

L'indifference des Etats africains aux problemes d'environnement est une idee fausse, car l'Afrique a tres tot mis l'accent sur la protection de la nature et des ressources naturelles : Rappel, analyse et problemes souleves par les conventions nationales ou entre Etats
South African Hepatitis C Management Guidelines 2010 : guidelines (2010)

The hepatitis C virus (HCV) is a global public health problem and a leading cause of chronic liver disease and the past decade has seen several significant advances in the management of persons infected with the virus.
The prevalence of HCV infection in South Africa is not known but has been estimated to be between 0.1 and 1.7 %.
Phylogenetic analysis of the HCV has revealed 6 main genotypes and most published data relate to genotypes 1, 2 and 3. Genotypes 4, 5 and 6 however represent > 20 % of HCV infections worldwide. Genotype 5 is found predominantly in South Africa where it represents up to 40 % of all HCV genotypes.
Chronic hepatitis C is an important cause of end stage liver disease and individuals with HCV-related cirrhosis have a 30 % risk of developing hepatic decompensation in 10 years and a 1 - 3 % per annum risk of developing hepatocellular carcinoma (HCC).
Male gender, infection at an advanced age, obesity, consumption of > 50 g alcohol per day and co-infection with the human immunodeficiency virus (HIV) are predictive of more rapid progression to fibrosis.
This document is based largely on the American Association for the Study of Liver Diseases (AASLD) 2009 Practice Guidelines and aims to provide clinicians with evidence based approaches to the management of HCV infection. It is recognized that reasonable physicians may deviate from the strategy and remain within acceptable standards of treatment.
Increasing concentration of inhaled saline with or without amiloride: Effect on mucociliary clearance in normal subjects (2020)

Mucociliary clearance is determined by ciliary activity and rheology of airway surface liquid. To test the hypothesis that mucociliary clearance would increase after inhalation of an osmotically active agent that would increase the volume of airway surface liquid, we measured mucociliary clearance in 16 normal subjects after inhalation of varying tonicities of saline alone, and after pretreatment with a Na+ channel blocker (amiloride). Subjects inhaled vehicle (0.12% saline) or amiloride, followed by inhalation of 0.12, 0.9, or 7% saline. Subsequently, mucociliary clearance rates were measured by γ scintigraphy of inhaled 99mTc Fe2O3. Mucociliary clearance of whole and peripheral lung was increased (approximately two-fold) after inhalation of increasing concentrations of saline (p < 0.04). Pretreatment with amiloride increased mucociliary clearance rates (approximately twofold) after inhalation of 0.12 and 0.9% saline (p < 0.05), but not 7% saline. The rates of mucociliary clearance by pretreatment with amiloride and 7% saline alone (approximately 1.4% per minute) approached the rapid mucocillary clearance rates (approximately 2.0% per minute) reported in systemic pseudohypoaldosteronism, which has loss-of-function mutations of the epithelial Na+ channel and an increased volume of airway surface liquid. We conclude that maneuvers that increase the volume of airway surface liquid are associated with increased rates of mucociliary clearance in normal subjects.
Asymmetric Total Synthesis of (−)-Quinocarcin (2008)

(-)-Quinocarcin (1) has been synthesized in a longest linear sequence of 22 steps from 3-hydroxybenzaldehyde in 16% overall yield. The Pictet-Spengler reaction of L-tert-butyl-2-bromo-5-hydroxy phenylalanate (17), synthesized according to Corey-Lygo's enantioselective alkylation process, with benzoxyacetaldehyde (12) under mild acidic conditions afforded 1,3-cis tetrahydroisoquinoline 20 as an only isolable stereomer in 91% yield. The diazabicycle[3,2,1]-octane ring system of 28 was constructed by a silver tetrafluoroborate-promoted intramolecular Mannich reaction using amino thioether as a latent N-acyliminium species and tethered silyl enol ether as a nucleophile. Using amino thioether instead of aminal as a precursor of N-acyliminium was of high importance to the success of this otherwise disfavored 5-endo-Trig cyclization. A Hf(OTf)4-catalyzed (0.1 equiv) transformation of aminal to amino thioether was uncovered in the course of this study, allowing the conversion of tricyclic aminal 24 to amino thioether 25 to be realized in high yield. From the bridged tetracyclic compound 28, a sequence of oxidation of aldehyde to acid, global deprotection under hydrogenolysis conditions, and one-pot partial reduction of lactam to aminal/oxazolidine formation completed the total synthesis of the pentacyclic (-)-quinocarcine.
Pyroelectric Energy Harvesting: With Thermodynamic-Based Cycles (2012)

This work deals with energy harvesting from temperature variations using ferroelectric materials as a microgenerator. The previous researches show that direct pyroelectric energy harvesting is not effective, whereas thermodynamic-based cycles give higher energy. Also, at different temperatures some thermodynamic cycles exhibit different behaviours. In this paper pyroelectric energy harvesting using Lenoir and Ericsson thermodynamic cycles has been studied numerically and the two cycles were compared with each other. The material used is the PMN-25 PT single crystal that is a very interesting material in the framework of energy harvesting and sensor applications.
Effect of microstructural features on media noise in longitudinal recording media (1993)

High-resolution transmission-electron microscopy (HRTEM) has been used to analyze CoCrTa, CoCrPt, and CoNiCrPt alloy thin films deposited under similar conditions onto NiP plated Al substrates with a Cr underlayer. Apparent ∼50 nm Co alloy grains observed by bright field TEM are found to be clusters of smaller 10–20 nm grains with a common growth orientation. Subtle differences have also been observed in the stacking fault density, Co alloy fcc phase concentration, lattice mismatch, and grain separation in the films. In particular, HRTEM shows that the CoCrTa film has clear physical separation between the 10 and 20 nm grains, which is not observed in the other media. Despite similar hysteresis loop properties, the signal-to-noise ratio of CoCrTa is 2.3 dB higher than CoCrPt and 4.6 dB higher than CoNiCrPt. Small isolated grains have been shown to improve media noise, as is observed in CoCrTa media.
Identification of Golli and myelin basic proteins in human brain during early development (2002)

The myelin basic protein gene (Mbp) encodes for the major myelin structural proteins and it is included in the Golli-Mbp gene complex. Previously, we observed MBP-like proteins in the human central nervous system (CNS) at developmental stages preceding myelination. In an effort to distinguish between Golli (HOG5 and HOG7) and MBP mRNAs and to determine their spatiotemporal distribution, we performed in situ hybridization using two human Golli specific probes: one corresponding to exon 5a absent from all MBP transcripts, and the other corresponding to exon 5c specific for HOG5. HOG7 transcript was observed first, in 5 gestational week-old embryos, whereas both Golli transcripts were detected at 6-7 weeks gestation in the proliferative zones of the entire CNS. Golli proteins immunoreactivity was observed in microglia and early neurons of the developing telencephalon. During midgestation (17-22 weeks gestation), at the onset of myelination, MBP and Golli mRNAs were observed in the telencephalic subventricular zone and occasionally in the future cerebral cortex. Developmental expression of the human Golli-Mbp indicates that the two Golli proteins have different onset of expression, distribution and possibly function. These results support the hypothesis that at least one of them, HOG7, may be involved in the regulation of early neurogenesis, while both may have additional, still undefined function at the onset of myelination.
E-Commerce Item Recommendation Based on Field-aware Factorization Machine (2015)

The RecSys 2015 contest [1] seeks the best solution to a top-N e-commerce item recommendation problem. This paper describes the team Random Walker's approach to this challenge, which won the 3rd place in the contest. Our solution consists of the following components. Firstly, we cast the top-N recommendation task into a binary classification problem and extract original features from the raw data. Secondly, we learn derived features using field-aware factorization machines (FFM) and gradient boosting decision tree (GBDT). Lastly, we train 2 FFM models with different feature sets and combine them by a non-linear weighted blending. This solution is the result of numerous tests and the scheme turns out to be effective. Our final solution achieved a score of 61075.2, ranking in the third place on the public leaderboard.
Rapid responses of soil microorganisms improve plant fitness in novel environments (2012)

Global change is challenging plant and animal populations with novel environmental conditions, including increased atmospheric CO(2) concentrations, warmer temperatures, and altered precipitation regimes. In some cases, contemporary or "rapid" evolution can ameliorate the effects of global change. However, the direction and magnitude of evolutionary responses may be contingent upon interactions with other community members that also are experiencing novel environmental conditions. Here, we examine plant adaptation to drought stress in a multigeneration experiment that manipulated aboveground-belowground feedbacks between plants and soil microbial communities. Although drought stress reduced plant growth and accelerated plant phenologies, surprisingly, plant evolutionary responses to drought were relatively weak. In contrast, plant fitness in both drought and nondrought environments was linked strongly to the rapid responses of soil microbial community structure to moisture manipulations. Specifically, plants were most fit when their contemporary environmental conditions (wet vs. dry soil) matched the historical environmental conditions (wet vs. dry soil) of their associated microbial community. Together, our findings suggest that, when faced with environmental change, plants may not be limited to "adapt or migrate" strategies; instead, they also may benefit from association with interacting species, especially diverse soil microbial communities, that respond rapidly to environmental change.
An introduction to IC testing (1971)

IC testing has evolved from the patterns established some years ago in the production of semiconductors. Since manual testing cannot meet the complex needs indigenous to IC manufacture, highly sophisticated instruments and test systems have developed that are automatically programmed by computer, tape, or printed-circuit card. This article focuses on many of the problems encountered and techniques employed, and also the requirements imposed on automatic IC testing systems.
Mosaic image generation on a flattened Gaussian sphere (2002)

Mosaicing of images is the task of fusing a collection of images with smaller fields of view to obtain an image with a larger field of view. In order to accomplish this task, images should be geometrically and radiometrically corrected. We propose a new approach for perspective correction, useful when smaller images are gathered by rotating a camera with a fixed position. These images are projected onto a Gaussian sphere centered at the focal point of the camera which is later flattened on a plane tangent to the sphere. Using this procedure a field of view of up to 360/spl deg/ can be obtained on a mosaic image. We illustrate the geometric correction capability of our procedure (including more traditional gray level modification and seam elimination techniques) on outdoor scene images that partly overlap with each other.
Characterization of a variable bit-rate receiver for applications in WDM/WDMA systems (2005)

A receiver optimized for a range of bit rates is desirable for full protocol transparent operations in WDM and WDMA systems. In order for a receiver to be optimally configured for a range of bit rates, the transimpedance of the preamplifier needs to be tunable. Here, we report the characteristics of a receiver whose performance can be optimized for bit rates ranging from 300 to 1,500 Mbps. The receiver is part of an eight-channel receiver array. The other seven receivers use passive feedback resistors in the transimpedance amplifiers.
Installation of Maureen Gravity Platform Over a Template (1985)

ABSTRACT From the start, Phillips Petroleum Company United Kingdom Ltd. and its partners adopted an innovative approach to develop the marginal Maureen field in a water depth of 97 metres in the North Sea. The project set a number of new offshore records including:The first winter tow of a large gravity platform.The use of large quantities of heavy solid ballast for the first time.The first mating of a fully commissioned deck in U.K. waters.The first installation of a gravity structure over a predrilled template. The successful installation in June 1983 was the culmination of a challenging series of novel marine operations which has demonstrated that a gravity platform can be accurately positioned over a subsea template in the open sea. The methods discussed can be considered for other applications to reduce the amount of offshore hook-up work and to achieve early production from predrilled wells. The paper describes the marine operations and equipment that was used to position and install the platform over the template with a precision of 2 inches. INTRODUCTION By North Sea standards, the relatively small amount of recoverable reserves makes Maureen a marginal field. This was the reason behind the innovative approach that Phillips Petroleum U.K. Ltd. adopted for the development of the Maureen project. Shuttle tankers are used to transport the oil ashore because the field's marginal oil reserves did not justify the expense of a dedicated pipeline. The tankers are loaded from a concrete articulated column connected to the drilling and production platform by a short Pipeline. The main platform has a storage capacity for 650,000 barrels of oil, equivalent to about 9 days production. The development programme pursued several objectives simultaneously to accelerate the work towards early production. While the wells were being drilled through a template offshore, the gravity base structure was being fabricated in a graving dock at the same time as the platform deck and topsides were being built. The gravity based platform, with its large storage tanks, allowed a fully commissioned deck to be transported by the structure and installed over the predrilled template in one operation. In the North Sea it normally takes from 12 to 36 months to drill the development wells and bring a field into full production after the platform has been installed and commissioned. By predrilling the wells through a subsea template using a semi-submersible drilling rig this time has been substantially reduced. This innovative approach meant that only several weeks after installing the platform the field could be brought into full production, and this with only a minimum amount of offshore hook-up and commissioning.
Krisesentre i Norge og covid-19 (2021)

I denne artikkelen diskuterer vi, med utgangspunkt i en studie om krisesentre, hvordan covid-19-pandemien har påvirket sentrenes virksomhet og deres arbeid med å hjelpe personer som er utsatt for vold i nære relasjoner. Studien ble gjennomført i to omganger i det første halvåret av pandemien – i perioden med strenge smitteverntiltak (april 2020) og i perioden etter oppmykningen av tiltakene (juli 2020). Resultatene peker på at pandemien ikke har ført til en krise for krisesentrene. Disse har tilrettelagt sin virksomhet godt for å håndtere smitteverntiltak og andre konsekvenser av pandemien. Flertallet oppgir at de har kunnet hjelpe voldsutsatte, og at samarbeidet med andre deler av tjenesteapparatet har fungert stort sett som før pandemien. Likevel har endringer og begrensninger i andre hjelpetilbud og i samfunnet for øvrig hatt konsekvenser for både brukere og ansatte ved krisesentrene. Sentrene er særlig bekymret for barn, brukere med etnisk minoritetsbakgrunn og voldsutsatte som er i spesielt sårbare situasjoner, eller som har tilleggsutfordringer. I tillegg synliggjør koronakrisen underliggende problemer, som ressursmangler og utilstrekkelige rammebetingelser for en del av krisesentrene.
Utility of 2-Aminothiophene-3-carboxamide in the Synthesis of Biologically Active, Fused Heterocyclic Derivatives (2005)

2-Amino-4,5,6,7-tetrahydrobenzo[b]thiophene-3-carboxamide (1) reacted with 3-iminobutyronitrile (2) to give the imino product 3. The latter product was used in synthesis of a series of annulated products which have pharmaceutical interest. The in vitro antimicrobial activity of some newly synthesized compounds against bacteria was studied.