gebhart/patrepeval huggingface dataset:
Cobalt carbonyl and phase transfer catalyzed carbonylation of thiiranes (1987)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCobalt carbonyl and phase transfer catalyzed carbonylation of thiiranesSerge. Calet, Howard. Alper, Jean Francois. Petrignani, and Henri. ArzoumanianCite this: Organometallics 1987, 6, 8, 1625–1628Publication Date (Print):August 1, 1987Publication History Published online1 May 2002Published inissue 1 August 1987https://pubs.acs.org/doi/10.1021/om00151a005https://doi.org/10.1021/om00151a005research-articleACS PublicationsRequest reuse permissionsArticle Views273Altmetric-Citations37LEARN 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-Alertsclose Get e-Alerts
Observation of Quantum Spin Hall States in InAs/GaSb Bilayers under Broken Time-reversal Symmetry (2013)

1.Observation of Quantum Spin Hall States in InAs/GaSb Bilayers under Broken Time-reversal Symmetry. Authors:Lingjie Du, Ivan Knez, Gerard Sullivan and Rui-Rui Du. arXiv:1306.1925 Recommended with a commentary by Patrick Lee, MIT |View Commentary| DOI: 10.36471/JCCM_August_2013_02 https://doi.org/10.36471/JCCM_August_2013_02
Within-pool prevalence limits for the identification of paratuberculosis infected herds using antibody detection in pooled milk samples (2017)

Identification of Mycobacterium avium subsp. paratuberculosis (MAP) infected herds is the first step in paratuberculosis control. Bulk milk or pooled milk sampling is a widely used, cost-effective approach for the surveillance of infectious diseases in dairy cattle. Due to insufficient data about the diagnostic performance, it has rarely been exploited for paratuberculosis. Using a logistic regression model, threshold levels of the apparent within-pool prevalence (WPPapp) were determined for the identification of paratuberculosis positive herds by antibody detection in pools of 50 individual milk samples, which is a usual pool size. A total of 73 milk pools were prepared, 50 from two MAP-positive and 23 from one MAP-non-suspect herds. Four different commercial ELISAs were used. WPPapp was estimated independently based on antibody positive individual milk or serum samples and on positive faecal culture. Antibody detection resulted in lower WPPapp estimates than faecal culture (FWPPapp) and tended to underestimate true prevalence. For pooled milk testing, cut-off values of the four ELISAs were revised to ensure 99% specificity and high sensitivity. For 50% probability of detection, FWPPapp thresholds of 8.9–16.3% were determined, increasing to 20.0–37.8% for 95% probability of detection. The results underline that antibody detection in pools of 50 individual milk samples or bulk tank milk from herds ≤ 50 cows allows only the identification of herds with a very high prevalence of MAP-shedders. In control programs this can be the first step to identify the most affected herds. However, it is ineffective for prevalence investigations, surveillance programs and certification.
Androgen levels of preeclamptic patients in the third trimester of pregnancy and six weeks after delivery (2001)

Background. The aim of this study was to measure the circulating levels of androgens in the third trimester of pregnancy and six weeks after delivery and to discuss androgen contribution in the pathogenesis of preeclampsia. Methods. Twenty-two preeclamptic and 20 normotensive women completed this prospective study. Blood samples were drawn in the third trimester (28–32 gestational weeks) and six weeks after delivery. Serum total testosterone (T), free testosterone (fT) dehydroepiandrosterone sulfate (DHEAS), androstenodione (A), sex hormone binding globulin (SHBG) and estradiol (E2) levels were measured. The statistical analyses of the data were performed by using Wilcoxon Rank test within the groups, Student unpaired t test and Chi-square test between the groups with the SPSS program. Results. T and fT levels were found to be significantly higher (p<0.05) in preeclamptic women in the third trimester compared to the values of normotensive controls. However, there were significant decreases (p<0.05) in T and fT levels six weeks after delivery, reaching values not significantly different from normotensive subjects (p>0.05). Futhermore, SHBG, DHEAS, A and E2 levels were not significantly different (p>0.05) between the groups in the third trimester or six weeks after delivery. Conclusion. We conclude that higher blood androgen levels measured in preeclamptic patients may be implicated in the pathogenesis of preeclampsia.
Perceptual photometric seamlessness in projection-based tiled displays (2005)

Arguably, the most vexing problem remaining for multi-projector displays is that of photometric (brightness) seamlessness within and across different projectors. Researchers have strived for <i>strict photometric uniformity</i> that achieves identical response at every pixel of the display. However, this goal typically results in displays with severely compressed dynamic range and poor image quality. In this article, we show that strict photometric uniformity is not a requirement for achieving photometric seamlessness. We introduce a general goal for photometric seamlessness by defining it as an optimization problem, balancing <i>perceptual uniformity</i> with <i>display quality</i>. Based on this goal, we present a new method to achieve <i>perceptually seamless high quality displays</i>. We first derive a model that describes the photometric response of projection-based displays. Then we estimate the model parameters and modify them using perception-driven criteria. Finally, we use the graphics hardware to reproject the image computed using the modified model parameters by manipulating only the projector inputs at interactive rates. Our method has been successfully demonstrated on three different practical display systems at Argonne National Laboratory, made of 2 × 2 array of four projectors, 2 × 3 array of six, projectors, and 3 × 5 array of fifteen projectors. Our approach is efficient, automatic and scalable---requiring only a digital camera and a photometer. To the best of our knowledge, this is the first approach and system that addresses the photometric variation problem from a perceptual stand point and generates truly seamless displays with high dynamic range.
Room-temperature magnetic gradiometry with fiber-coupled nitrogen-vacancy centers in diamond (2015)

Differential optical detection of a magnetic resonance induced in nitrogen-vacancy (NV) centers in diamond is shown to enable a high-spatial-resolution room-temperature magnetic-field gradiometry on a fiber platform. An ultracompact design of this fiber-based solid-state magnetic gradiometer is achieved by integrating an NV-diamond magnetic sensor with a two-fiber opto-microwave interface, which couples NV centers to microwave and optical fields, used to resonantly drive and interrogate the spin of NV centers.
Plasmonic nano-structures for optical data storage (2009)

We propose a method of optical data storage that exploits the small dimensions of metallic nano-particles and/or nano-structures to achieve high storage densities. The resonant behavior of these particles (both individually and in small clusters) in the presence of ultraviolet, visible, and near-infrared light may be used to retrieve pre-recorded information by far-field spectroscopic optical detection. In plasmonic data storage, a very short (approximately few femtoseconds) laser pulse is focused to a diffraction-limited spot over a small region of an optical disk containing metallic nano-structures. The digital data stored in each bit-cell, comprising multiple bits of information, modifies the spectrum of the incident light pulse. This spectrum is subsequently detected, upon reflection/transmission, with the aid of an optical spectrum analyzer. We present theoretical as well as preliminary experimental results that confirm the potential of plasmonic nano-structures for high-density optical data storage applications.
Versatile Gas/Particle Ion Chromatograph (2005)

A new, compact gas/particle ion chromatograph has been developed for measuring ionic constituents in PM2.5 (particulate matter of aerodynamic diameter < or = 2.5 microm) and water-soluble ionogenic gases. The instrument has separate sampling channels for gases and particles. In one, a membrane denuder collects soluble gases for preconcentration and analysis. In the other, a cyclone removes larger particles, a membrane denuder removes soluble gases, and a continuously wetted hydrophilic filter collects particles. A single, multiport, syringe pump handles liquid transport, and one conductivity detector measures anions and ammonium for both channels. Electrodialytically generated gradient hydroxide eluent permits 20 min chromatographic runs. Gas/particle samples are each collected for 40 min, butthe sampling intervals are staggered by 20 min. Liquid samples from the gas denuder and particle collector are aspirated and preconcentrated on sequential cation and anion concentrators and transferred respectively to an ammonia transfer device and an anion separation column. The flow configuration results in an ammonium peak before anion peaks in the chromatogram. The system measures ammonia, organic acids (such as acetic, formic, and oxalic acids), HCl, HONO, SO2, HNO3, and the corresponding ions in the aerosol phase. Low ng/m3 to sub-ng/m3 limits of detection (LODs) are attained for most common gases and particulate constituents, the LODs for gaseous SO2 to NH3 range, for example, from sub parts per trillion by volume (sub-pptv) to approximately 5 pptv.
From Petrochemical Polyurethanes to Biobased Polyhydroxyurethanes (2013)

From a green and sustainable chemistry standpoint, the current challenge in the polyurethane’s industry is to switch from petrobased polyurethanes (PUs) to biobased polyhydroxyurethanes (PHUs). This review describes the main alternative strategies being developed with a focus on PHUs from vegetable oils and derivatives. The substitution of petrobased polyols by natural oil based polyols was the first route to biobased PUs to be developed. The second strategy involves synthesis without the need of harmful isocyanate by the nucleophilic polyaddition of polyamines to polycyclic carbonates. The technological barrier to the synthesis of biobased cyclic carbonates could be overcome by the chemical transformation of epoxidized vegetable oils or by the use of glycerine carbonate-based intermediates. New families of biobased PHUs with a lower environmental footprint could be generated.
Integrated shim layer (2002)

The integrated shim layer hides the implementation details of optical transport systems. It performs framing, setting up and tearing down lightpaths, performance monitoring, and localized protection switching. It resides in the optical layer as the driver module.
New Strategies in Learning Real Time Heuristic Search (1997)

In contrast to o#-line search algorithms suchasA # and IDA # , in real-time heuristic searchwehave to commit amove within a limited search horizon or time. One well known algorithm in this class is RTA # . An algorithm is said to learn if it improves its performance over successive problem trials. In RTA # the heuristic estimation is in general not admissible. Thus RTA # has to be modi#ed to a variant LRTA # that is capable of learning. The aim of the strategies proposed in this paper is to improve the estimations found in LRTA # . First, we examine two new schemas forward updating and backward updating for LRTA # . Then we propose CRTA # whichworks similar to RTA # but terminates with admissible heuristic values. It is shown that the strategy used in CRTA # can be made e#ciently. Combined with lazy evaluation updating CRTA # leads to an improved real time learning algorithm called SLRTA # . Experimentally we show that CRTA # expands signi#cantly less nodes than LRTA # and thus converges faster to the optimal values.
Physical Properties of Polyurethanes Produced from Polyols from Seed Oils: II. Foams (2006)

Abstract Rigid polyurethane (PU) foams were prepared using three North American seed oil starting materials. Polyol with terminal primary hydroxyl groups synthesized from canola oil by ozonolysis and hydrogenation based technology, commercially available soybean based polyol and crude castor oil were reacted with aromatic diphenylmethane diisocyanate to prepare the foams. Their physical and thermal properties were studied and compared using dynamic mechanical analysis and thermogravimetric analysis techniques, and their cellular structures were investigated by scanning electron microscope. The chemical diversity of the starting materials allowed the evaluation of the effect of dangling chain on the properties of the foams. The reactivity of soybean oil‐derived polyols and of unrefined crude castor oil were found to be lower than that of the canola based polyol as shown by their processing parameters (cream, rising and gel times) and FTIR. Canola‐PU foam demonstrated better compressive properties than Soybean‐PU foam but less than Castor‐PU foam. The differences in performance were found to be related to the differences in the number and position of OH‐groups and dangling chains in the starting materials, and to the differences in cellular structure.
ORGANIZAÇÃO DO TRABALHO E MEDIAÇÃO DO SOFRIMENTO DE PILOTOS METROVIÁRIOS (2013)

Este estudo objetivou verificar quais estrategias pilotos metroviarios do Distrito Federal lancam mao para mediar o sofrimento no trabalho, utilizando como aporte teorico a psicodinâmica do trabalho. Os resultados encontrados apontam rigidez na organizacao do trabalho prescrito, dificuldade na gestao e relacoes de poder; sentimento de indignidade, inutilidade, desqualificacao e indignacao. Exige-se, assim, que os trabalhadores se utilizem da construcao de um coletivo de regras e estrategias defensivas individuais como formas de lidar com as dificuldades descritas.
Investigation of single sideband optical frequency comb generations using a dual-electrode Mach-Zehnder modulator in a fiber recirculating loop (2003)

The precise measurement of difference frequencies between two lasers in a terahertz (THz) region is a basic technique for optical frequency standards and for many other applications, such as dense WDM communication systems. Frequency difference measurements based on the beat signal between two lasers become quite difficult when the frequency difference exceeds the detector bandwidth. An optical frequency comb (OFC) generator with an electro-optic (EO) phase modulator inside a Fabry-Perot cavity can overcome this problem. The OFC generator creates a large number of sidebands, which can be applied for frequency markers. In conventional OFC generation, modulation sidebands appears on both sides of the carrier, which is a disadvantage for the efficient use of frequency bandwidth. The limit of the frequency difference measurement with this scheme depends on the power degradation in the sidebands. We propose an alternative technique for generating OFC which employs a dual-electrode Mach-Zehnder Modulator (D-MZM) inside a fiber recirculating loop to generate optical single sideband (SSB). This enables the efficient use of the frequency bandwidth. An optical amplifier is used in the loop to compensate for the losses.
Intramuscular lipid metabolism, insulin action, and obesity (2008)

With the increasing prevalence of obesity, research has focused on the molecular mechanism(s) linking obesity and skeletal muscle insulin resistance. Metabolic alterations within muscle, such as changes in the cellular location of fatty acid transporter proteins, decreased mitochondrial enzyme activity, and defects in mitochondrial morphology, likely contribute to obesity and insulin resistance. These defects are thought to play a role in the reduced skeletal muscle fatty acid oxidation and increased intramuscular lipid (IMCL) accumulation that is apparent with obesity and other insulin-resistant states such as type 2 diabetes. Intramuscular triacylglycerol does not appear to be a ubiquitous marker of insulin resistance, although specific IMCL intermediates such as long-chain fatty acyl-CoAs, ceramide, and diacylglycerol may inhibit insulin signal transduction. In this review, we will briefly summarize the defects in skeletal muscle lipid metabolism associated with obesity, and discuss the proposed mechanisms by which these defects may contribute to insulin resistance.
Reversible Binding of Dioxygen by a Copper(I) Complex with Tris(2-dimethylaminoethyl)amine (Me6tren) as a Ligand (1999)

A reversible reaction with dioxygen is observed for the copper(I) complex [Cu(Me6tren)]+ (Me6tren=tris(2-dimethylaminoethyl)amine) at low temperatures. This complex displays an interesting crystal structure (depicted) and the interaction with dioxygen in solution was investigated by low-temperature UV/Vis spectroscopic methods.
Modification of epoxy resin with reactive end-capped carboxylic imide oligomer for manufacture of glass-fiber reinforced composite (2017)

The present work aims at preparing glass-fiber reinforced epoxy resin composite modified with reactive end-capped carboxylic imide oligomer. The carboxylic imide 2,2-bis[4-(4-aminophenoxy)phenyl propane (CIBAPP) oligomer was synthesized via two-step polycondensation of 2,2-bis[4-(4-aminophenoxy)phenyl propane (BAPP) diamine and trimellitic anhydride (TMA), then the oligomer was characterized by FTIR spectrum and solubility test. The oligomer was used as a blending component for the modification of the epoxy resin system for fabricating glass-fiber reinforced laminate. The resultant composite had good properties such as the dielectric strength of 197kV/cm, volume resistance of 2.1×1015Ω•cm, longitudinal and transverse stress of 686MPa and 631MPa, respectively, water absorption rate of 0.18% and surface energy of 43.6mJ/m2.
Utility of Fast Mycobacterial Interspersed Repetitive Unit--Variable Number Tandem Repeat Genotyping in Clinical Mycobacteriological Analysis (2004)

These examples illustrate the utility of this genotyping technique for quick and accurate resolution of problems commonly encountered in clinical mycobacteriology.
[Disorders of sleep structure and autonomic regulation in sleep of patients with stroke]. (1998)

Peculiarities of both the structure of night sleep and autonomic regulation in the sleep were studied in 30 patients with ischemic stroke of different location. Clinical, polysomnographic (including autonomic indices) and psychologic methods were used. Considerable alterations in the structure of night sleep were observed, namely: lengthening of the period of falling asleep, increase of the time of awakening inside the sleep, impossibility to support necessary duration of both stages and phases of sleep. The indices of cardiovascular system's activity such as heart rate (HR) and arterial pressure (AP) were altered most of all. The most dramatic disorders of both the structure of sleep and autonomic regulation in the sleep were found in right hemispheric and medial location of ischemic stroke. High values of HR and AP in the sleep (especially in phase of the fast sleep), high HR and AP variability as well as the decrease of these indices from the first cycle of the sleep to the third one were prognostically unfavourable factors.
System of digital tomosynthesis for nondestructive testing (1988)

The article describes a computerized system of tomographic reconstruction of a three-dimensional object from its two-dimensional projections on the basis of the methods of tomosynthesis. It deals with modified algorithms, the structure of program provisions and instrumental realization of the system. Variants of tomographic reconstruction with filtering are suggested. The results of an experiment with tomographic reconstruction of a test object are presented.
Vitreoretinal surgery assisted by the 193-nm excimer laser. (1997)

The technology is applicable to a variety of intraocular vitreoretinal surgical procedures.
<i>In-situ</i> and <i>ex-situ</i> characterization of TiO2 and Au nanoparticle incorporated TiO2 thin films for optical gas sensing at extreme temperatures (2012)

Sensor technologies that can operate under extreme conditions including high temperatures, high pressures, highly reducing and oxidizing environments, and corrosive gases are needed for process monitoring and control in advanced fossil energy applications. Sensor technologies based on optical waveguide-based techniques are highly attractive for passive, embedded, and remote sensing. A critical enabling technology for optical waveguide sensors is the development of advanced optical thin film coatings which have a desired set of optical properties that change in a rapid, selective, and sensitive manner to a particular quantity of interest. TiO2 and Au nanoparticle incorporated TiO2 nanocomposite thin films were prepared through sol-gel deposition techniques and their respective optical responses to a 4% H2/N2 mixture were investigated in the visible / near-IR range of 400–1000 nm. A tendency for Au nanoparticles to occupy special sites on the TiO2 microstructure, such as grain boundaries, twin boundaries, and triple points is rationalized in terms of basic surface energy arguments. The Au / TiO2 nanocomposite films showed a useful optical response due to a reversible, rapid, and repeatable shift in the localized surface plasma resonance peak of Au nanoparticles at a temperature of 650 °C and 850 °C. In contrast, high temperature exposure of TiO2 films to reducing gases at 850 °C resulted in the growth of abnormally large grains or “hillocks” that protruded from the sample surface and resulted in light scattering and an irreversible decrease in transmission at short wavelengths. The origin of the observed optical response of Au / TiO2 nanocomposite films is discussed in the context of work by prior investigators in the Au / yttria-stabilized Zirconia (YSZ) system and needs for future research in this area is highlighted.
Efficacy of Escitalopram for Hot Flashes in Healthy Menopausal Women (2011)

clinicaltrials.gov Identifier: NCT00894543.
Lithium treatment of bipolar affective disorders under naturalistic followup conditions. (1996)

A naturalistic followup was conducted on 41 bipolarmanic inpatients who sought ongoing treatment after hospital discharge. Standardized interviews were conducted 2 and 4.5 years after hospitalization to assess medication use, outcome, and relapse. At followup, 41 percent of the bipolar patients taking lithium had poor outcome. Nearly half met criteria for relapse and had been rehospitalized. Patients on lithium had the same work and overall functioning as those who were not taking it. Patients on lithium alone, however, had significantly better adjustment and fewer relapses compared with those taking lithium plus neuroleptics. A subgroup of good-prognosis bipolar patients may respond to lithium monotherapy under typical clinical conditions, however, those requiring adjunctive maintenance neuroleptics may be at higher risk for poor outcome. Lithium prophyliaxis may be less effective in routine clinical practice than in specialized treatment centers, possibly due to less rigorous treatment monitoring, medication noncompliance, complex affective symptoms, and poorer surveillance to defect recurrent prodromal illness.