gebhart/patrepeval huggingface dataset:
SSIM-inspired two-pass rate control for High Efficiency Video Coding (2015)

We propose a perceptual two-pass rate control scheme for High Efficiency Video Coding (HEVC). The target bits are optimally allocated by hierarchically constructing a perceptual uniform space derived based on an SSIM-inspired divisive normalization mechanism for each group of pictures (GoP), each frame, and each coding unit (CU). The Lagrange multiplier λ, which controls the trade-off between perceptual distortion and bit rate, is adopted as the GoP level complexity measure. After the first pass compression, Laplacian based rate and perceptual distortion models are established to adaptively derive λ, and the target bits are dynamically allocated by maintaining an uniform Lagrange multiplier level through λ equalization. Within each GoP, rate control is further performed at frame and CU levels in the perceptually uniform space. Extensive simulations verify that, the proposed scheme can achieve high accuracy rate control and superior rate-SSIM performance.
Protein amyloids develop an intrinsic fluorescence signature during aggregation (2013)

We report observations of an intrinsic fluorescence in the visible range, which develops during the aggregation of a range of polypeptides, including the disease-related human peptides amyloid-β(1-40) and (1-42), lysozyme and tau. Characteristic fluorescence properties such as the emission lifetime and spectra were determined experimentally. This intrinsic fluorescence is independent of the presence of aromatic side-chain residues within the polypeptide structure. Rather, it appears to result from electronic levels that become available when the polypeptide chain folds into a cross-β sheet scaffold similar to what has been reported to take place in crystals. We use these findings to quantify protein aggregation in vitro by fluorescence imaging in a label-free manner.
Reaction of Hydrogen Peroxide with Ferrylhemoglobin:  Superoxide Production and Heme Degradation (2000)

The reaction of Fe(II) hemoglobin (Hb) but not Fe(III) hemoglobin (metHb) with hydrogen peroxide results in degradation of the heme moiety. The observation that heme degradation was inhibited by compounds, which react with ferrylHb such as sodium sulfide, and peroxidase substrates (ABTS and o-dianisidine), demonstrates that ferrylHb formation is required for heme degradation. A reaction involving hydrogen peroxide and ferrylHb was demonstrated by the finding that heme degradation was inihibited by the addition of catalase which removed hydrogen peroxide even after the maximal level of ferrylHb was reached. The reaction of hydrogen peroxide with ferrylHb to produce heme degradation products was shown by electron paramagnetic resonance to involve the one-electron oxidation of hydrogen peroxide to the oxygen free radical, superoxide. The inhibition by sodium sulfide of both superoxide production and the formation of fluorescent heme degradation products links superoxide production with heme degradation. The inability to produce heme degradation products by the reaction of metHb with hydrogen peroxide was explained by the fact that hydrogen peroxide reacting with oxoferrylHb undergoes a two-electron oxidation, producing oxygen instead of superoxide. This reaction does not produce heme degradation, but is responsible for the catalytic removal of hydrogen peroxide. The rapid consumption of hydrogen peroxide as a result of the metHb formed as an intermediate during the reaction of reduced hemoglobin with hydrogen peroxide was shown to limit the extent of heme degradation.
Identification of Fructooligosaccharides in Different Banana Cultivars (2008)

Banana has been currently indicated as a good source of fructooligosaccharides (FOS), which are considered to be functional components of foods. However, significant differences in their amounts in bananas have been observed in the literature. This work aims to identify and quantify FOS during ripening in different banana cultivars belonging to the most common genomic groups cultivated in Brazil. Considering that these differences can be due to cultivar, stage of ripening, and the methodologies used for FOS analyses, sugar contents were analyzed by high performance anion exchange chromatography-pulsed amperometric detection (HPAEC-PAD) and gas chromatography-mass spectrometry (GC-MS). An initial screening of eight cultivars (Ouro, Nanicão, Prata, Maçã, Mysore, Pacovan, Terra, and Figo) in a full-ripe stage showed that 1-kestose, the first member of the FOS series (amounts between 297 and 1600 microg/g of DM), was accumulated in all of them. Nystose, the second member, was detected only in Prata cultivar. Five of the cultivars were analyzed during ripening, and a strong correlation could be established with a specific sucrose level ( approximately 200 mg/g of DM), which seems to trigger the synthesis of 1-kestose (the low amounts of FOS, below the functional recommended dose, indicates that banana cannot be considered a good source of FOS).
The Anodic Polishing of Electroplated Nickel (1940)

Dull nickel deposits may be given a brilliant finish by a brief anodic treatment in a sulphuric acid solution; polishing action is obtained over a wide range of conditions. The method has possibilities as an alternative to bright nickel plating and the process has been investigated from this point of view. Under suitable conditions, the process does not adversely affect the protective properties of the deposit and the quality of the finish is at least as good as that obtained by bright nickel plating. The method also enables designs to be formed on nickel surfaces by localising the area polished, and attractive finishes may be produced in this way.
Efficiency of various photonic bandgap (PBG) structures (2003)

The designed photonic bandgap (PBG) structure is essentially periodic perforations on the ground plane to provide effective and flexible control of electromagnetic waves along specific directions. This is achieved by controlling the hole's structure and the distance between the periodic holes on the ground plane. The designed PBG structures exhibit stop-band characteristics, and the optimal position of the 50 /spl Omega/ microstrip line and the correct control of the hole's structure on the ground plane, which bring about the perturbation electromagnetic waves, are determined. In this paper, we compare the performance of the PBG structures with different hole cells on the ground plane. The simulated results, with full wave electromagnetic analysis, are in good agreement with those experimental data.
.beta.-Adrenergic blocking agents of the chromone and xanthone groups. II. Propanolol type derivatives (1972)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT.beta.-Adrenergic blocking agents of the chromone and xanthone groups. II. Propanolol type derivativesP. Da Re, G. P. Primofiore, and A. BertelliCite this: J. Med. Chem. 1972, 15, 8, 868–869Publication Date (Print):August 1, 1972Publication History Published online1 May 2002Published inissue 1 August 1972https://pubs.acs.org/doi/10.1021/jm00278a029https://doi.org/10.1021/jm00278a029research-articleACS PublicationsRequest reuse permissionsArticle Views107Altmetric-Citations15LEARN 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
New PWM Technique Using a Triangular Carrier Wave of Saturable Amplitude (1984)

A new technique for a PWM inverter is described. By using a triangular wave of saturable amplitude, adjustment of the amplitude of the multiple reference waves can be avoided. Two typical circuits for inducing saturable triangular waves are illustrated, and a new strategy is proposed which uses the line-to-line voltages of a three-phase ac source as reference wave instead of the usual phase voltages. Two approaches which improve the performance of the PWM inverter and largely simplify the control circuit are developed. One depresses the occurrence of subharmonics without making use of the usual synchronization of the carrier wave with the reference waves; the other is a method for reducing the switchings of the power devices. A simple purely digital control circuit with improved performance has been constructed according to the new technique, and model PWM patterns for constant V/F control as well as their harmonic content are given.
Direct NMR Evidence for Ethanol Binding to the Lipid-Water Interface of Phospholipid Bilayers (1994)

The mechanisms behind the membrane-mediated effects of ethanol were examined via the interaction of ethanol with phospholipid bilayers at hydration levels of 10-12 water molecules per lipid. 2H and 31P nuclear magnetic resonance (NMR) spectroscopy was used to monitor deuterated water and ethanol and the headgroups and acyl chains of neutral phospholipids. Ethanol was found to interact strongly with both phosphatidylcholine (PC) and phosphatidylethanolamine (PE) bilayers, giving 2H NMR quadrupolar splittings for CH3CD2OH between 6.3 and 9.4 kHz. The quadrupolar splittings for ethanol in gel-phase lipids remained well resolved and were not significantly larger than those in the L alpha phase, suggesting that little or no ethanol was bound in the hydrocarbon interior of the bilayer. Ethanol binding significantly altered the orientation of the lipid headgroups, as shown with headgroup-deuterated PC bilayers. The entire lengths of the acyl chains were significantly disordered by the ethanol interaction, evidenced by significant reductions in the 2H NMR order parameters of the chains. The disordering corresponds to an increase in the area per lipid by an estimated 6% with one ethanol molecule per lipid, and a total of 18% with a second ethanol per lipid. This pronounced area increase is presumably caused by the disruption of lipid packing in the rigid region of the glycerol backbone rather than in the acyl chains, since the order of hydrocarbon chains is not affected to a significant degree by incorporation of alkanes and long-chain alcohols into the hydrocarbon interior.(ABSTRACT TRUNCATED AT 250 WORDS)
Power amplifier linearization by modified baseband signal injection (2015)

This paper presents the linearization technique for RF power amplifiers that uses the modified baseband signals. The signal for linearization is formed in baseband, digitally processed by adjusting the amplitude and polarity and injected at the input and output of the amplifier transistor across the DC bias circuits. The modified baseband signal is one of the products of the second order nonlinearity of a nonlinear system fed by the useful baseband signal. The effects of the proposed linearization method are considered on a single stage power amplifier for quadrature amplitude modulated signals characterized with different bandwidth up to 200 MHz, as well as for WCDMA digitally modulated signal.
Avant-Garde Choreography (1961)

The past fifteen years have witnessed the emergence of a new group of choreographers, who share the conviction that the proper subject of dance is dancing. They reject the idea that a story, or even content in the traditional sense, is necessary to a dance work. Instead, they assert the independence of dance as pure movement, refusing to make it a handmaiden of drama or music or spectacle. To do so, they have stripped their productions of many of the elements generally associated with this theatrical form. The consequences are an austerity, sparseness and concentration such as the art has not known heretofore. The new works have evoked a good deal of controversy, with reactions ranging from wild enthusiasm to indifference—accom panied by the shrugging comment that it can't last —to violent opposition, stirred by the fear that the new choreographers will turn the dancer of the future into a mere robot.
Statin Therapy (2007)

3-Hydroxy-3-methylglutaryl coenzyme A reductase inhibitors, also known as statins, are the cornerstones of treatment of hyperlipidemia. They are widely used drugs that have well-documented, advantageous effects on cholesterol and atherosclerosis. The pleiotropic activities of statins can lead to newer applications. This review describes some of the available evidence supporting the use of statins for the treatment of acute coronary syndrome, as adjuncts to percutaneous coronary intervention, and for the prevention of sepsis. It also briefly discusses the rationale behind the potential development of statin-eluting stents.
Canopy reflectance, photosynthesis and transpiration (1985)

Abstract A two-stream approximation model of radiative transfer is used to calculate values of hemispheric canopy reflectance in the visible and near-infrared wavelength intervals. Simple leaf models of photosynthesis and stomatal resistance are integrated over leaf orientation and canopy depth to obtain estimates of canopy photosynthesis and bulk stomatal or canopy resistance. The ratio of near-infrared and visible reflectances is predicted to be a near linear indicator of minimum canopy resistance and photosynthetic capacity but a poor predictor of leaf area index or biomass.
Polysaccharide production in <i>Pseudomonas cepacia</i> (1994)

The effects of glucose, osmolarity, temperature and mode of growth on exopolysaccharide production in Pseudomonas cepacia was studied in batch culture using a chemically defined growth medium. Polymer production was maximal under conditions of a 2% (w/v) glucose supplement, 0.4 M NaCl and an incubation temperature of 35 degrees C. In addition, polysaccharide composition and molecular weight varied with mode of growth. On agar culture there was a decrease in pyruvate and rhamnose content yet an increase in the amount of acetate compared to the polymer isolated from broth culture equivalents. The clinical implications of these results are discussed in relation to the potential pathogenicity of P. cepacia in cystic fibrosis patients.
Low-Temperature Growth of Graphene by Chemical Vapor Deposition Using Solid and Liquid Carbon Sources (2011)

Graphene has attracted a lot of research interest owing to its exotic properties and a wide spectrum of potential applications. Chemical vapor deposition (CVD) from gaseous hydrocarbon sources has shown great promises for large-scale graphene growth. However, high growth temperature, typically 1000 °C, is required for such growth. Here we demonstrate a revised CVD route to grow graphene on Cu foils at low temperature, adopting solid and liquid hydrocarbon feedstocks. For solid PMMA and polystyrene precursors, centimeter-scale monolayer graphene films are synthesized at a growth temperature down to 400 °C. When benzene is used as the hydrocarbon source, monolayer graphene flakes with excellent quality are achieved at a growth temperature as low as 300 °C. The successful low-temperature growth can be qualitatively understood from the first principles calculations. Our work might pave a way to an undemanding route for economical and convenient graphene growth.
Multiple LSP routing network security for MPLS networking (2003)

In this paper, network security algorithms and control protocol enhancements for multiple label switched path (LSP) routing in multiprotocol label switching (MPLS) networks are investigated. Most of the former research on multiple-path routing has been focused on using multiple paths as a topology to improve the throughput and the robustness of data transportation over packet switching networks. The developed topology absorbs these benefits and extends the features to provide enhanced wide area network (WAN) security. The proposed multipath technology uses the MPLS networking topology to provide enhanced levels of protection against path information sniffing and deciphering.
A comparison of multi-layer neural networks and optimized nearest neighbor classifiers for handwritten digit recognition (2002)

The basic nearest neighbor classifier (NNC) is often inefficient for classification in terms of memory space and computing time if all training samples are used as prototypes. These problems can be solved by reducing the number of prototypes using clustering algorithms and optimizing the prototypes using a special neural network model. The author compares the performance of the multi-layer neural network and an optimized nearest neighbor classifier (ONNC). It is shown that an ONNC can have the same recognition performance and the same memory requirement as but need less training and classification time than an equivalent neural network.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
Projet GABIE : Guidage Actif Basé sur l'Imagerie Echographique (2005)

National audience
Studies in the Chemistry of Natural Products: Rearrangement Reactions of Diterpenoid and Norditerpenoid Alkaloids (1992)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies in the Chemistry of Natural Products: Rearrangement Reactions of Diterpenoid and Norditerpenoid AlkaloidsS. William PelletierCite this: J. Nat. Prod. 1992, 55, 1, 1–24Publication Date (Print):January 1, 1992Publication History Published online1 July 2004Published inissue 1 January 1992https://pubs.acs.org/doi/10.1021/np50079a001https://doi.org/10.1021/np50079a001research-articleACS PublicationsRequest reuse permissionsArticle Views270Altmetric-Citations10LEARN 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
Sensitive Gas Chromatography-Mass Spectrometry Method for Simultaneous Measurement of MDEA, MDMA, and Metabolites HMA, MDA, and HMMA in Human Urine (2006)

This gas chromatography-mass spectrometry assay provides adequate sensitivity and performance characteristics for the simultaneous quantification of MDEA, MDMA, and its metabolites HMMA, MDA, and HMA in human urine. The method meets and exceeds the requirements of the proposed Substance Abuse and Mental Health Services Administration's guidelines for federal workplace drug testing of MDEA and MDMA in urine.
Adhesive Bonding of Various Materials to Hard Tooth Tissues. XIV. Enamel Mordant Selection Assisted by ESCA (XPS) (1978)

Surface analysis by XPS (X-ray photoelection spectroscopy), also called ESCA (electron spectroscopy for chemical analysis), indicates that only certain cations are appreciably sorbed by enamel from an acid etching solution containing phosphoric acid and equimolar concentrations of candidate mordant salts.
Conflict resolution in fuzzy forward chaining production systems (1988)

Forward-chaining productions have been used to implement some of the most significant expert systems. However, most forward chaining production languages make no provision for dealing with lexical imprecision. This paper briefly presents a language which supports fuzzy matching between condition patterns and facts in working memory. Then discussion is focussed on what part should be played in conflict resolution by the relative truth-values of fuzzily matched production instantiations.
Preparation and Characterization of Me<sub>2</sub>O<sub>3</sub>−CeO<sub>2</sub> (Me = B, Al, Ga, In) Mixed-Oxide Catalysts (2007)

The present work is focused on the synthesis and characterization of ceria-based mixed oxides. Ceria was combined with the other oxides from group III, with the intention of improving the catalytic properties of thus obtained materials. (B2O3, Al2O3, Ga2O3, In2O3)−CeO2 mixed oxides with a wide range of Me2O3 contents have been prepared by a coprecipitation route. The obtained solid materials have been characterized in terms of their structural, textural, and surface properties, including the acid−base and red−ox features, by a variety of techniques (BET, XRD, Raman, SEM, TG, TPR-TPO). The acid−base properties were estimated by the adsorption of probe molecules (NH3 and SO2), investigated by the use of two techniques: microcalorimetry and XPS. The obtained materials exhibited satisfactory homogeneity; the highest surface areas were achieved for Al2O3−CeO2 mixed oxides. Only the fluorite structure of CeO2 was observed by XRD for all prepared mixed oxides, along with the presence of oxygen vacancies, which has been proven by Raman spectroscopy. Red−ox properties were investigated for In2O3−CeO2 samples. The degree of reduction decreased with In2O3 loading. Besides, the reduction−oxidation cycle, performed up to 830 °C, changed the morphology and structure of the samples irreversibly, leading to crystallization of In2O3. Among all investigated materials, only boria created significant acidity, whereas the basicity has been found to be dependent on the nature and amount of group III metal.
Structural Investigations of Prehydrolyzed Precursors Used in the Sol‐Gel Processing of Lead Titanate (1990)

A variety of titanate gels were prepared from lead acetate and titanium isopropoxide in methoxyethanol. In the present study, 1 H and 13 C Fourier transform‐nuclear magnetic resonance and mass spectroscopic techniques were used to identify the structure of the lead and titanium precursors formed from lead acetate and titanium isopropoxide, respectively, when refluxed in methoxyethanol. The lead and titanium precursors were determined to be Pb(OOCCH 3 ) (OC 2 H 4 OCH 3 ). x H 2 O, where x < 0.5, and Ti 2 (OC 2 H 4 OCH 3 ) 8 , respectively. Similar spectroscopic procedures were applied to identify the lead titanium complex formed from the reaction between lead and titanium precursors.
Learning tax regulations through rules-based chatbots using decision trees: a case study at the time of COVID-19 (2020)

Chatbots have represented a revolution in how companies relate internally to their collaborators and externally to their customers. The impact they have had is directly related to saving time in business processes, an improvement in experience, and economic savings for those who implement them. At the educational level, various experiences of virtual assistants have been appreciated with promising results about how the tools are exploited against the learning results of the students. This paper presents the experience carried out by accounting students to teach rules related to tax control processes through the use of a rules-based chatbot that uses decision trees. The study focused on remote learning for COVID-19 reasons. The results of this experience are promising in this area, due to the complexity of the content and the little innovation in existing teaching subjects in the area. In general, the students presented an improvement in learning compared to other remote learning techniques.