gebhart/patrepeval huggingface dataset:
A novel active snubber for high-power boost converters (1999)

A technique which improves the performance of the boost converter by reducing the reverse-recovery-related losses in the boost switch and rectifier with an active snubber that is implemented with a minimum number of components is presented. This minimum-component count snubber consists of a snubber inductor, an auxiliary switch, and a rectifier. The proposed technique reduces the reverse-recovery-related losses by controlling the turn-off di/dt rate of the rectifier current with the snubber inductor connected in series with the boost switch and rectifier. The voltage and current stresses of the components in the proposed active-snubber boost converter are similar to those in its conventional "hard-switched" counterpart.
Temperature compensated SAW with high quality factor (2017)

Mark Twain said “There is no such thing as a new idea. It is impossible. We simply take a lot of old ideas and put them into a sort of mental kaleidoscope. We give them a turn and they make new and curious combinations. We keep on turning and making new combinations indefinitely; but they are the same old pieces of colored glass that have been in use through all the ages.” This sentiment rings true for high quality factor temperature compensated SAW devices (TCSAW). The foundations for high Q TCSAW arrived nearly 30 yrs prior to their application in cellular handsets. Two dominant technical foundations are temperature compensation by an SiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> overcoat [1], and the suppression of transverse modes by construction of a acoustic waveguide for the so called “piston mode” [2]. [1] K. Yamanouchi, “SAW Properites of SiO2/128o Y-X LiNbO3 Structure Fabricated by Magnetron Sputtering Technique,” IEEE Trans. on Sonics and Ultrasonics, Vol. SU-31, No. 1, Jan 1984. [2] S. Wilkus, C. Hartmann, R. Kansy, “Transverse Mode Compensation of Surface Acoustic Wave Filters,” IEEE IUS 1985.
MoSi2-Base Structural Composite Passed Engine Test (1999)

The intermetallic compound molybdenum disilicide (MoSi2) is an attractive high-temperature structural material for advanced engine applications. It has excellent oxidation resistance, a high melting point, relatively low density, and high thermal conductivity; and it is easily machined. Past research at the NASA Lewis Research Center has resulted in the development of a hybrid composite consisting of a MoSi2 matrix reinforced with silicon nitride (Si3N4) particulate and silicon carbide (SiC) fibers. This composite has demonstrated attractive strength, toughness, thermal fatigue, and oxidation resistance, including resistance to pest oxidation. These properties attracted the interest of the Office of Naval Research and Pratt & Whitney, and a joint NASA/Navy/Pratt & Whitney effort was developed to continue to mature the MoSi2 composite technology. A turbine blade outer air seal, which was part of the Integrated High Performance Turbine Engine Technology (IHPTET) program, was chosen as a first component on which to focus.
Study and fabrication of bioinspired Octopus arm mockups tested on a multipurpose platform (2010)

This paper illustrates a robotic approach to the study of the Octopus vulgaris arm. On the base of the embodied intelligence theory, a study on the interaction among materials, mechanisms and actuation systems has been conducted. Starting from the observation of the performances of the octopus and drawing inspiration by its functional anatomy, several mock-ups, made by different materials and actuated by different cable arrangements have been tested. For this purpose a versatile platform has been designed and built, where the various solutions have been mounted and compared. The final aim of the work is to replicate the main complex movements of the octopus in a robotic platform. In particular the reaching movement, which best represents the stereotyped motion pattern of the octopus arm, has been reproduced.
Automatic system for diabetic retinopathy screening based on AM-FM, partial least squares, and support vector machines (2010)

Diabetic retinopathy (DR) is a disease that affects over 170 million people worldwide. In the United States, it is estimated that over 10 million diabetics do not receive the recommended annual eye examinations, significantly increasing their risk of vision loss. In this paper we present an automatic system to detect the presence of DR by analyzing a photograph of the central field of the retina. The system applies Amplitude Modulation-Frequency Modulation (AM-FM) for feature extraction, and partial least squares (PLS) and support vector machines (SVM) for classification. We tested the system on a total of 400 images, and obtained an area under the ROC curve (AUC) of 0.86, and corresponding sensitivity/specificity of 98%/68%. We also tested the accuracy of the system for patients needing immediate referral to a specialist, obtaining an AUC of 0.98.
Photoassisted Chemical Vapor Deposition for Packaging and Fabrication of Wide-Band Gap Semiconducting Devices (1997)

Abstract : Major improvements have been made in the fabrication and in the performance characteristics of boron carbide-based, wide-band gap semiconductor devices. During this grant, working boron carbide transistors, tunnel junctions and homojunction diodes were fabricated. These transistors and diodes were the first carbide based devices of their type to be reported in either academic laboratories or in industry. Protocols for boron carbide substrate fabrication were optimized and the boron carbide thin films were deposited on a wide variety of substrates, including Si(111), aluminum, steel, gold, titanium and silver. PACVD (photoassisted chemical vapor deposition) methods using orthocarborane as a source molecule, were tailored to achieve band gaps of up to 4.0 eV with temperature stability to 250 C. The boron carbide material was successfully doped both n-type and p-type, and methods of tuning the band gap by inclusion of phosphorus-containg dimeric chloro-phospha-3-carborane allowed the band gap to be tuned reliably over the range of 0.7 to 2.4 eV by appropriate adjustment of feed gas. A novel class of CVD molecules, the metallocenes, were used for n-type doping. The sensitivity of these molecules to electron or photon beams have also allowed metal wires and other metal-metal containing features to be written with dimensions as small as 500 angstroms in resolution.
Production of Arachidonic and Eicosapentaenoic Acids in Plants Using Bryophyte Fatty Acid Δ6-Desaturase, Δ6-Elongase, and Δ5-Desaturase Genes (2008)

The liverwort Marchantia polymorpha L. synthesizes arachidonic (ARA) and eicosapentaenoic acids (EPA) from linoleic and alpha-linolenic acids respectively by a series of reactions catalyzed by Delta6-desaturase, Delta6-elongase, and Delta5-desaturase. Overexpression of the M. polymorpha genes encoding these enzymes in transgenic M. polymorpha plants resulted in 3- and 2-fold accumulation of ARA and EPA respectively, as compared to those in the wild type. When these three genes were introduced and co-expressed in tobacco plants, in which long-chain polyunsaturated fatty acids (LCPUFAs) are not native cellular components, ARA and EPA represented up to 15.5% and 4.9% respectively of the total fatty acid in the leaves. Similarly in soybean, C20-LCPUFAs represented up to 19.5% of the total fatty acids in the seeds. These results suggest that M. polymorpha can provide genes crucial to the production of C20-LCPUFAs in transgenic plants.
Novel Sulfonanilide Analogues Suppress Aromatase Expression and Activity in Breast Cancer Cells Independent of COX-2 Inhibition (2006)

Aromatase is a particularly attractive target in the treatment of estrogen receptor positive breast cancer. Aromatase levels in breast cancer cells are enhanced by prostaglandins and reduced by COX inhibitors. The synthesis and biological evaluation of a novel series of sulfonanilide analogues derived from the COX-2 selective inhibitor NS-398 are described. The compounds suppress aromatase enzyme activity in SK-BR-3 breast cancer cells in a dose- and time-dependent manner. The effect of these compounds on COX-2 inhibition is investigated in breast cancer cells as well. Structure-activity analysis does not find a correlation between aromatase suppression and COX-2 inhibition. Microsomal aromatase inhibition studies rule out the possibility of direct enzyme inhibition. Real-time PCR analysis demonstrates that the sulfonanilide analogues decrease aromatase gene transcription in SK-BR-3 cells. These studies suggest that the novel sulfonanilide compounds suppress aromatase activity and transcription in SK-BR-3 breast cancer cells independent of COX-2 inhibition.
Proximity‐Based Sortase‐Mediated Ligation (2017)

Protein bioconjugation has been a crucial tool for studying biological processes and developing therapeutics. Sortase A (SrtA), a bacterial transpeptidase, has become widely used for its ability to site-specifically label proteins with diverse functional moieties, but a significant limitation is its poor reaction kinetics. In this work, we address this by developing proximity-based sortase-mediated ligation (PBSL), which improves the ligation efficiency to over 95 % by linking the target protein to SrtA using the SpyTag-SpyCatcher peptide-protein pair. By expressing the target protein with SpyTag C-terminal to the SrtA recognition motif, it can be covalently captured by an immobilized SpyCatcher-SrtA fusion protein during purification. Following the ligation reaction, SpyTag is cleaved off, rendering PBSL traceless, and only the labeled protein is released, simplifying target protein purification and labeling to a single step.
Mersacidin, a new antibiotic from Bacillus Fermentation, isolation, purification and chemical characterization. (1992)

Mersacidin (1) is a new peptide antibiotic containing beta-methyllanthionine. It is classified as a member of the proposed lantibiotic group of antibiotics, and is produced by a species of Bacillus. Mersacidin has a molecular weight of 1,824 (C80H120N20O21S4). The antibiotic is active against Gram-positive organisms including methicillin-resistant Staphylococcus aureus, but has no activity against Gram-negative bacteria or fungi.
New modulation-based watermarking technique for video (2006)

Successful watermarking algorithms have already been developed for various applications ranging from meta-data tagging to forensic tracking. Nevertheless, it is commendable to develop alternative watermarking techniques that provide a broader basis for meeting emerging services, usage models and security threats. To this end, we propose a new multiplicative watermarking technique for video, which is based on the principles of our successful MASK audio watermark. <i>Audio</i>-MASK has embedded the watermark by modulating the short-time envelope of the audio signal and performed detection using a simple envelope detector followed by a SPOMF (symmetrical phase-only matched filter). <i>Video</i>-MASK takes a similar approach and modulates the image luminance envelope. In addition, it incorporates a simple model to account for the luminance sensitivity of the HVS (human visual system). Preliminary tests show algorithms transparency and robustness to lossy compression.
Mechanism of rhodium-promoted triphenylphosphine reactions in hydroformylation processes (1984)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of rhodium-promoted triphenylphosphine reactions in hydroformylation processesA. G. Abatjoglou, E. Billig, and D. R. BryantCite this: Organometallics 1984, 3, 6, 923–926Publication Date (Print):June 1, 1984Publication History Published online1 May 2002Published inissue 1 June 1984https://pubs.acs.org/doi/10.1021/om00084a017https://doi.org/10.1021/om00084a017research-articleACS PublicationsRequest reuse permissionsArticle Views1244Altmetric-Citations66LEARN 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
Modulating Electron Transfer Dynamics at Dye–Semiconductor Interfaces via Self-Assembled Bilayers (2015)

Forward and back electron transfer at dye–semiconductor interfaces are pivotal events in dye-sensitized solar cells and dye-sensitized photoelectrosynthesis cells. Here we introduce self-assembled bilayers as a strategy for manipulating electron transfer dynamics at these interfaces. The bilayer films are achieved by stepwise layering of bridging molecules, linking ions, and dye molecules on the metal oxide surface. The formation of the proposed architecture is supported by ATR-IR and UV–vis spectroscopy. By using time-resolved emission and transient absorption, we establish that the films exhibit an exponential decrease in electron transfer rate with increasing bridge length. The findings indicate that self-assembled bilayers offer a simple, straightforward, and modular method for manipulating electron transfer dynamics at dye–semiconductor interfaces.
Spin Torque–Generated Magnetic Droplet Solitons (2013)

Dissipative solitons have been reported in a wide range of nonlinear systems, but the observation of their magnetic analog has been experimentally challenging. Using spin transfer torque underneath a nanocontact on a magnetic thin film with perpendicular magnetic anisotropy (PMA), we have observed the generation of dissipative magnetic droplet solitons and report on their rich dynamical properties. Micromagnetic simulations identify a wide range of automodulation frequencies, including droplet oscillatory motion, droplet "spinning," and droplet "breather" states. The droplet can be controlled by using both current and magnetic fields and is expected to have applications in spintronics, magnonics, and PMA-based domain-wall devices.
Alternating Stereospecific Copolymerization of Ethylene and Propylene with Metallocene Catalysts (2001)

The copolymerization of ethylene and propylene with bridged metallocenes Me(2)E(3-RCp)(Flu)X(2)/MAO (E = C, X = Me; E = Si, X = Cl; R = H or alkyl) was investigated. Ethylene/propylene copolymerization with metallocenes having heterotopic active sites (R =Me, i-Pr) yield alternating, isotactic ethylene/propylene copolymers with percentages of alternating EPE+PEP triads in the range of 61-76% at 50% ethylene incorporation. Both the nature of the substituent R and the bridge E influence the copolymerization behavior including the copolymerization activity, copolymer sequence distribution, molecular weight, and stereochemistry. Silicon-bridged metallocenes produce copolymers with higher activity and molecular weight but lower propylene incorporation at similar feeds than the carbon-bridged analogues. Isotactic PEPEP sequences were observed for all metallocenes, while the tacticities of the EPPE sequences varied with the bridge and the substituent on the metallocene ligand. Isotactic PEPEP sequences and atactic EPPE sequence errors in the alternating copolymers are consistent with a mechanism where the comonomers are enchained alternately at the heterotopic coordination sites of the metallocenes. Isotactic EPPE sequences are indicative of occasional multiple insertions at the stereospecific site, caused by an isomerization of the chain prior to monomer insertion (backskip).
What makes an Image Iconic? A Fine-Grained Case Study (2014)

A natural approach to teaching a visual concept, e.g. a bird species, is to show relevant images. However, not all relevant images represent a concept equally well. In other words, they are not necessarily iconic. This observation raises three questions. Is iconicity a subjective property? If not, can we predict iconicity? And what exactly makes an image iconic? We provide answers to these questions through an extensive experimental study on a challenging fine-grained dataset of birds. We first show that iconicity ratings are consistent across individuals, even when they are not domain experts, thus demonstrating that iconicity is not purely subjective. We then consider an exhaustive list of properties that are intuitively related to iconicity and measure their correlation with these iconicity ratings. We combine them to predict iconicity of new unseen images. We also propose a direct iconicity predictor that is discriminatively trained with iconicity ratings. By combining both systems, we get an iconicity prediction that approaches human performance.
Use of Modified Nanoparticles in Oil and Gas Reservoir Management (2012)

Abstract We describe a water dispersed nano sensor cocktail based on InP/ZnS quantum dots (QDs) and atomic silver clusters with a bright and visible luminescence combined with optimized sensor functionalities for the water flooding process. The QDs and Ag nano sensors were tested in simulated reservoir conditions (high salinity, Ca2+, pH, high temperature, oil and solids). The nano sensors showed enhanced sensor functionalities towards pH, temperature, sub-terrain chemistry and reservoir solids like clay or calcium carbonate.
Identification of Membrane Anchorage Domains of the HIV-1 gp160 Envelope Glycoprotein Precursor (1991)

The gp41 transmembrane protein of human immunodeficiency virus type 1 (HIV-1) contains a hydrophobic membrane-spanning domain that serves to anchor the gp120-gp41 complex on the surface of infected cells and virions. To study the requirements for membrane anchorage, conservative amino acid substitutions in three residues at a time were made within this hydrophobic gp41 region. The complete gp160 precursor as well as the gp120 exterior envelope glycoprotein were exported into the supernatant of expressing cells for two mutants with amino acid substitutions in residues 687-689 and 697-699. The soluble gp160 molecules exhibited a binding ability for CD4 on the surface of SupT1 cells that was 33-36% that of the soluble gp120 glycoproteins. These results implicate residues 687-689 and 697-699 as important components of the stop-transfer signal that anchors the gp160 envelope glycoprotein precursor in the membrane. The data also suggest that characteristics in addition to hydrophobicity are required for stop-transfer signals.
<i>e</i> −-beam deposition of ZrO2-Sc2O3 films (1990)

A new method is presented of depositing zirconia-scandia films following evaporation of the oxide powders using an electron beam. The relative amount of Sc was increased in steps from 0 to 8 at. %. In the ‘‘as-deposited’’ state, all films were amorphous, but crystallized following post-deposition heat treatments. As the atomic percent of Sc was increased, the tetragonal phase of zirconia was stabilized. It appeared as a single phase for compositions with more than 5 at. % Sc.
Practical identification with encrypted biometric data using oblivious RAM (2013)

Bringer et al. introduced a new primitive that enables identification over encrypted biometric data stored on a remote database and that preserves the privacy of the database users toward the database holder. The tools used in their scheme however rely on heavy cryptographic protocols that prevent it from being used in practice for large databases. We modify their technique using Oblivious RAM and prove its usability by an implementation adapted to iris recognition. For a database of 250,000 IrisCodes, only 3.6 MB of data need to be locally stored and an identification request using our new protocol requires less than 350 ms of computation time.
Statistical Detection of Atypical Aircraft Flights (2006)

A computational method and software to implement the method have been developed to sift through vast quantities of digital flight data to alert human analysts to aircraft flights that are statistically atypical in ways that signify that safety may be adversely affected. On a typical day, there are tens of thousands of flights in the United States and several times that number throughout the world. Depending on the specific aircraft design, the volume of data collected by sensors and flight recorders can range from a few dozen to several thousand parameters per second during a flight. Whereas these data have long been utilized in investigating crashes, the present method is oriented toward helping to prevent crashes by enabling routine monitoring of flight operations to identify portions of flights that may be of interest with respect to safety issues.
Design study of an infrared panoramic optical system (1996)

A design study was undertaken on an infrared, 3-5-μm, panoramic optical system for a particular monitoring application. The different types of systems investigated covered the conventional fish-eye lens system, a panoramic block arrangement, and a new type of configuration based on a panoramic shell. Examples of these systems are included, and their advantages and disadvantages are discussed.
Prolactin localization, binding, and effects on peroxidase release in rat exorbital lacrimal gland. (1992)

Prolactin immunoreactivity has been detected in human tears and in lacrimal glands, and it has been suggested that this hormone might be a modulator of lacrimal secretion as well as a component of lacrimal gland fluid. The present study was designed to confirm the immunocytochemical localization of prolactin in the rat lacrimal gland, to determine the source of the prolactin, and to evaluate the acute effects of prolactin on lacrimal secretory function. We have confirmed that prolactin-like immunoreactivity is present in secretory vesicles of acinar cells of male and female Sprague-Dawley rats. Prolactin message was present at detectable levels in RNA extracts of lacrimal glands from males, indicating that at least a component of the prolactin-like immunoreactivity was the product of synthesis within the lacrimal glands. Crude membrane fractions from acini isolated from males bound 43.1 +/- 3.2 femtomoles prolactin/mg protein (mean +/- standard error of the mean; n = 6), which was significantly (P less than 0.01) more than comparable fractions from females (15.4 +/- 2.4 fmoles/mg protein, n = 6). Preincubating membranes at 65 degrees for 20 min to release endogenous ligands increased prolactin binding to 84.8 +/- 20.8 fmoles/mg protein for males and 63.8 +/- 17.4 fmoles/mg protein for females (P greater than 0.1), suggesting that, on average, similar numbers of receptors are expressed in acinar cells of male and female rats but a larger fraction of the receptors is occupied by endogenous prolactin-like peptides in females. Because prolactin binding triggers prolactin receptor internalization in various cell types, we propose that the prolactin-like immunoreactivity in lacrimal acinar cells of females has been accumulated from the circulation, while the immunoreactivity seen in males results, at least in part, from de novo synthesis. Ovine prolactin at concentrations of 10-20 ng/ml inhibited carbachol-induced peroxidase release by 19.6% +/- 6.9% (n = 8, P less than 0.02) but failed to alter peroxidase release in the absence of carbachol. These observations suggest that prolactin might function as an endocrine, paracrine, or autocrine modulator in the lacrimal gland.