gebhart/patrepeval huggingface dataset:
Pourquoi partager mes photos de vacances avec des inconnus ? (2009)

Résumé Cet article propose une analyse des usages du site de partage de photos Flickr conduite à partir d’une extraction de l’ensemble des comptes, réalisée en août 2006. Elle permet de montrer la diversité et l’hétérogénéité des usages de cette plateforme phare parmi les sites du web 2.0. L’une des originalités de Flickr est d’encourager les utilisateurs à développer des conversations avec les photos qu’ils rendent publiques sur le site. Cet usage ne constitue qu’une part des pratiques du site, à coté du stockage des photos ou d’un usage conversationnel sans photo. Les auteurs proposent enfin quelques pistes pour montrer comment les formes d’échanges photographiques développées sur Flickr participent aussi au principe d’une transformation des esthétiques amateurs.
Electronic Spectroscopy of CF3O in a Supersonic Jet: Symmetry and Rotational Structure of a Prototypical Perfluoroalkoxy Radical (1994)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic Spectroscopy of CF3O in a Supersonic Jet: Symmetry and Rotational Structure of a Prototypical Perfluoroalkoxy RadicalXue-Qing Tan, Min-Chieh Yang, Christopher C. Carter, James M. Williamson, Terry A. Miller, Todd E. Mlsna, J. D. O. Anderson, and Darryl D. DesmarteauCite this: J. Phys. Chem. 1994, 98, 11, 2732–2734Publication Date (Print):March 1, 1994Publication History Published online1 May 2002Published inissue 1 March 1994https://pubs.acs.org/doi/10.1021/j100062a005https://doi.org/10.1021/j100062a005research-articleACS PublicationsRequest reuse permissionsArticle Views77Altmetric-Citations14LEARN 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 options Get e-Alerts
Collective spin waves in Fe/Pd and Fe/W multilayers (1987)

In Fe/Pd and Fe/W multilayers the complete, theoretically predicted band of collective magnetostatic spin-wave excitations has been observed. Despite the large number of bilayers (49–90) discrete spin-wave modes have been found in the upper half of the band. For Fe/Pd multilayers the saturation magnetization shows a monotonic reduction of up to 30% with decreasing modulation wavelength (down to 33 Å), which is not found in the Fe/W multilayer.
Pharmacodynamics of tissue-type plasminogen activator characterized by computer-assisted simulation. (1986)

Prospective characterization of pharmacodynamics of tissue-type plasminogen activator (t-PA) is needed for diverse clinical applications. Accordingly, we used physiologically based, computer simulation of participating biochemical reactions in response to concentrations of circulating t-PA seen with infusions of 1 to 7 hr duration in 45 patients. Predicted values were compared with those from a "training set" obtained in six patients given t-PA for coronary thrombosis and six receiving therapy for peripheral arterial occlusion. Subsequently, results of simulation were compared prospectively with observations from a "test set" of 33 consecutive patients given low doses of t-PA for as long as 7 hr or higher doses for 1 to 2 hr and with data from 101 patients given t-PA in the European Cooperative Trial. Fits between observed and predicted values were close. Based on observations in the training set, the alpha 2-macroglobulin reaction with circulating plasmin and ongoing synthesis of plasminogen were incorporated in the simulations. Fibrinogenolysis in vitro was documented despite supplementation of samples with aprotinin, particularly when concentrations of t-PA were high. This phenomenon can lead to overestimation of fibrinogen depletion and was found to be obviated by the use of PPACK, a novel serine protease inhibitor. Results indicate that the simulation approach developed permits economic, prospective evaluation of regimens of t-PA suitable for diverse conditions and delineation of the impact of individual constituents and reactions on pharmacodynamics of t-PA and on the risk of induction of a systemic lytic state.
Mechanisms for Eicosanoid Precursor Uptake and Release by a Tissue Culture Cell Line (1985)

Mouse fibrosarcoma cells (HSDM1C1) that synthesize prostaglandin E2 (PGE2) in response to bradykinin and calcium ionophore A23187 were adapted to grow in lipid-free medium to produce arachidonate deficiency. Such cells produce PGE2 in response to agonists only after repletion with arachidonate. Repleted cells release arachidonate from phosphatidylinositol (80%) and phosphatidylcholine (20%). Release from A23187-treated cells is qualitatively different, indicating that alternative mechanisms are involved in activation of cells by this non-physiological agonist. A variant cell line deficient in arachidonoyl-CoA synthetase was isolated after mutagenesis and radiation suicide selection. This cell line is not only deficient in arachidonate uptake but also in release of arachidonate in response to agonists. These results indicate that arachidonoyl-CoA synthetase is required for eicosanoid homeostasis. This enzyme metabolizes only those fatty acids that are potential eicosanoid precursors and accounts for the rapid and high affinity uptake of these fatty acids into phosphatidylinositol and phosphatidylcholine. Fatty acids are most susceptible to release by agonists immediately after uptake into the cell. Subsequently, they redistribute into metabolically inert phospholipid pools.
Air-Injection, and Other, Combustion-Turbulence Generators for Extended Expansion-Stroke Spark-Ignition Engines (1996)

<div class="htmlview paragraph">A new form of variable geometry, extended expansion, four-stroke internal combustion engine is described that is unable to employ squish over the full operating range. Accordingly a prediction was made of the influence of squish on the production of kinetic energy available for turbulence generation in a representative spark-ignition engine. It was found that the contribution of kinetic energy useable during the combustion process was commonly in the region of about 6% of that due to induction. It was, therefore, deduced that for typical spark-ignition engines the major benefit derived from the provision of squish surfaces is the resultant compactness of the combustion zone. Several techniques to counter the penalty resulting from the elimination of squish were reviewed. It was found that the most promising device was a turbulator incorporating low-pressure, compressed air, injection into the cylinder at the end of induction.</div> <div class="htmlview paragraph"><b>MOST MODERN SPARK-IGNITION ENGINES</b> employ squish, a feature of combustion-zone geometry often assumed to contribute, significantly, to turbulence occurring during the combustion process. The notion that squish is an important contributor to combustion turbulence arose many years ago with the introduction of a side-valve engine configuration featuring a compact combustion chamber located, in the cylinder head, over the valves and extending over only a portion of the cylinder bore instead of encompassing the whole cylinder-bore area as was customary with earlier engines. The compact combustion system was labelled a “turbulent head” to distinguish it from the earlier form implying, also, an increase in combustion-zone turbulence (<span class="xref">1</span>)<span class="xref">*</span>.</div> <div class="htmlview paragraph">Since a recently proposed form of Otto-Atkinson type, extended expansion, engine cannot employ squish under all operating conditions it is particularly important to investigate, in detail, the importance of squish both from the viewpoint of the contributions of squish to combustion-zone turbulence and to combustion-zone compactness. The configurations of greatest interest for such a study are not, of course, side-valve engines but rather overhead-valve units with, and without the provision of squish. Firstly the variable geometry extended expansion, Otto-Atkinson engine concept will be introduced briefly since it is this concept which has lead to a focus on the importance or otherwise of squish and the possibility of the need for alternative systems to compensate for the absence of squish in the proposed form of Otto-Atkinson engine.</div>
The sites of synthesis of the principal thylakoid membrane polypeptides in Chlamydomonas reinhardtii. (1977)

The sites of synthesis of the major thylakoid membrane polypeptides have been studied in the green alga Chlamydomonas reinhardtii by pulse labeling of cells with [14C]acetate in the presence of inhibitors specific for chloroplast and cytoplasmic protein synthesis. The labeled membrane polypeptides were separated by an improved method of sodium dodecyl sulfate (SDS) gradient gel electrophoresis, and autoradiographs were made of the dried gels. The results demonstrate that of the 33 polypeptides resolved in the gels, at least nine are made on chloroplast ribosomes. Two of these (polypeptides 2 and 6) are associated with the reaction centers of photosystems I and II. Another polypeptide (polypeptide 5) appears from genetic data to be coded by chloroplast DNA. Experiments with a mutant whose chloroplast ribosomes are resistant to spectinomycyn (spr-u-1-6-2) show that polypeptides whose synthesis takes place on chloroplast ribosomes are made in the presence of spectinomycin in the mutant although their synthesis is blocked by this antibiotic in wild type cells.
Influence de l'estimation du canal sur les performances d'un egaliseur dans le cadre des radiocommunications avec les mobiles (1992)

Cette these traite de l'influence de l'estimation de la reponse impulsionnelle du canal sur les performances d'un egaliseur. Le travail se situe dans le cadre des futurs systemes de radiocommunications numeriques cellulaires a acces multiple a repartition dans le temps (amrt); il caracterise l'interaction entre le canal, le systeme et le recepteur. Les differentes parties d'un recepteur sont analysees en detail separement. Pour ameliorer les performances des egaliseurs a dispositif de reaction, nous avons teste l'efficacite d'un prefiltre correcteur de phase et developpe une nouvelle technique d'adaptation de ce filtre a partir de l'estimation du canal. Une determination explicite de la longueur optimale de la sequence d'apprentissage est deduite de l'evaluation d'un estimateur de canal operant sur des sequences cazac. Une methode analytique pour estimer les performances d'un egaliseur en fonction de la qualite de l'estimation de la reponse impulsionnelle du canal est developpee pour des modulations de phase a deux et quatre etats. Les resultats obtenus dans le cas d'une egalisation sans poursuite sont compares a des resultats de simulation, montrant une bonne adequation des resultats. Cette etude quantifie l'effet conjoint des differents parametres d'un systeme amrt et des caracteristiques du canal sur le taux d'erreur en sortie de l'egaliseur. Une structure optimale des blocs de donnees peut etre determinee explicitement en fonction des contraintes et des specifications du systeme a l'aide de la methode proposee
A Small-Angle Neutron Scattering Study of Cholic Acid-Based Organogel Systems (2004)

Small-angle neutron scattering measurements were performed on some cholic acid-based gel systems in order to gain detailed information about the network structure. The presence of thin fibers with a radius of about 10-20 A was found for various gelators. Two types of interaction between different sorts of fibers were demonstrated, depending on the molecular structure of the gelator. The first type involves the presence of microcrystalline knots with a dimension of about 100-200 A between the fibers. Upon heating, this network gradually disintegrates. The second type involves loose entanglements between flattened fibers. The occurrence of these types of interaction is related to the length of the alkyl tail attached to cholic acid.
Halving imaging time of whole brain diffusion spectrum imaging and diffusion tractography using simultaneous image refocusing in EPI (2009)

The net reduction to nearly half the number of diffusion encoding gradient pulses in SIR-EPI significantly reduces acquisition times of DSI and DTI.
The Acidities of Weak Acids in Dimethyl Sulfoxide. II. The Hammett Acidity Function (1965)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Acidities of Weak Acids in Dimethyl Sulfoxide. II. The Hammett Acidity FunctionEdwin C. Steiner and Joanne M. GilbertCite this: J. Am. Chem. Soc. 1965, 87, 2, 382–384Publication Date (Print):January 1, 1965Publication History Published online1 May 2002Published inissue 1 January 1965https://pubs.acs.org/doi/10.1021/ja01080a044https://doi.org/10.1021/ja01080a044research-articleACS PublicationsRequest reuse permissionsArticle Views388Altmetric-Citations71LEARN 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
ChemInform Abstract: Chemistry of the Coumalic Acid Derivatives. Part 2. The Influence of Aniline pK<sub>a</sub>* Values on the Formation and Reactivity of Substituted Butadienes from Methyl Coumalate. (1985)

Abstract Das Produkt der (Eintopf‐)Reaktion zwischen 2 Äquiv Cumalinsäureester (II) und verschiedenen Anilinen (I) hängt von deren jeweiligem pK a *‐Wert ab: Aromatische Amine (Ia), (Ib) mit pK a ‐Werten von 1.05 ‐ 2.8 liefern bicyclische Lactone (V) [die Verbindungen (Vb) können auch in 2stufiger Reaktion gewonnen werden (47 ‐ 52%)], während solche mit hohem pK a ‐Wert (Ic), (Id) auch Azabicyclononadiencarbonsäuren wie (VII) geben.
Quasi-phase-matched generation of tunable blue light in a quasi-periodic structure (2004)

We present what is to our knowledge a new approach to generating tunable blue light by cascaded nonlinear frequency conversion in a single LiTaO3 crystal. Simultaneous quasi-phase matching of an optical parametric generation process and a sum-frequency mixing process is achieved by means of structuring the crystal with a quasi-periodic optical superlattice. The spectral (wavelength tuning and bandwidth) and power characteristics of the blue-light generation are studied with a fixed-wavelength 532-nm picosecond laser and a wavelength-tunable nanosecond optical parametric oscillator (OPO) as the pump sources. By tuning the OPO wavelength, we could tune the blue output over approximately 20 nm. Temperature tuning of the blue output at a fixed pump wavelength of 532 nm was limited to approximately 1.5 nm. A maximum blue power of 15 microW was generated at a pump power of 0.5 mW, corresponding to an efficiency of 3%.
Insights into the Mode of Action of Benzyl Isothiocyanate on Campylobacter jejuni (2013)

Campylobacter jejuni is a widespread pathogen responsible for most of the food-borne gastrointestinal diseases in Europe. The use of natural antimicrobial molecules is a promising alternative to antibiotic treatments for pathogen control in the food industry. Isothiocyanates are natural antimicrobial compounds, which also display anticancer activity. Several studies described the chemoprotective effect of isothiocyanates on eukaryotic cells, but the antimicrobial mechanism is still poorly understood. We investigated the early cellular response of C. jejuni to benzyl isothiocyanate by both transcriptomic and physiological approaches. The transcriptomic response of C. jejuni to benzyl isothiocyanate showed upregulation of heat shock response genes and an impact on energy metabolism. Oxygen consumption was progressively impaired by benzyl isothiocyanate treatment, as revealed by high-resolution respirometry, while the ATP content increased soon after benzyl isothiocyanate exposition, which suggests a shift in the energy metabolism balance. Finally, benzyl isothiocyanate induced intracellular protein aggregation. These results indicate that benzyl isothiocyanate affects C. jejuni by targeting proteins, resulting in the disruption of major metabolic processes and eventually leading to cell death.
Integrated secure wireless system for smart home monitoring and control (2009)

Smart homes are ones that have an intelligent environment that enables dynamic configuration of its devices as well as interaction with its occupants, be it while they are inside the home or remotely while outside. This paper outlines the major technologies that support the realisation of smart homes. It describes the complete architecture and design of a prototype smart home system that integrates a variety of wireless information and communication technologies with a variety of sensors and appliances. The prototype system enables an authorised user to monitor and control home devices equipped with a smart interface structure using a mobile phone. The system is embedded with authentication and verification mechanisms that provide secure end-to-end processing. The system is scalable through a flexible architecture that easily expands the portfolio of devices to be monitored and controlled.
Greenhouse Partner Robot System (2010)

The mechanization and automation of agriculture have progressed for streamlining and saving labor of agricultural work. However there are many technical problems for automation of agriculture, because judgments based on human experiences and delicate works are sometimes required. So we propose Greenhouse Partner Robot System which is agricultural support system in greenhouse by cooperation between humans and robots. In this paper, we focused on two works, harvesting and pest control, which the introduction of simple robotics technology will be able to streamline and save labor of considerably. The system consists of Greenhouse Partner Robots and a supervisor. Greenhouse Partner Robot is a four-wheel cart which runs autonomously on a guidance line in greenhouse and has joystick based power assist function, and consists of a mobile base, a joystick, an assist bar, a sensor for tracking a guidance line and RFID tag reader. In the system, a supervisor controls Greenhouse Partner Robots without interference and Greenhouse Partner Robots operate in accordance with supervisor's commands. The experimental results using two Greenhouse Partner Robots illustrated the validity of the proposed control methods and system.
Analysis of Ultra-Pure Gases by Ion Mobility Spectrometry (1995)

Work has continued with the evaluation of the Ion Mobility Spectrometer (IMS) for the analysis of gases having low parts-per-billion (10(exp -9)) water concentration. A modified PCP, inc. MMS-160 Mobility Mass Spectrometer System was used for the analysis of ultra-pure argon and nitrogen. The MMS-160 system permits the mass-identification of unique reactant and product ions observed in the reduced-water host gases. When the water is removed to low ppb levels, higher energy reactant ions are observed. In nitrogen, distinct odd- and even-numbered nitrogen cluster ion mobility peaks are observed, as well as adduct ion peaks from the trace contaminants in the gas. Argon also produces a cluster ion mobility peak and adduct ion peaks from trace components in the gas. Levels of contaminants in these ultra-pure gases can be determined from the ion mobility spectra. A calibrated source was used to provide variable known quantities of water to the pure gas supply of the IMS.
Facile Regio‐ and Diastereoselective Syntheses of Hydroxylated 2‐Aminocyclohexanecarboxylic Acids. (2005)

Abstract For Abstract see ChemInform Abstract in Full Text.
Small-scale explosive welding of aluminum (1972)

Welding technique uses very small quantities of explosive ribbon to accomplish small-scale lap-welding of aluminum plates. Technique can perform small controlled welding with no length limitations and requires minimal protective shielding.
FACTORS AFFECTING THE RESTORATION OF REGENERATIVE CAPACITY IN THE EXTREMITIES OF AXOLOTLS (LARVAL SALAMANDERS), WHICH HAD BEEN SUPPRESSED BY X-RAY IRRADIATION (1963)

A total of 160 axolotls were given an x-ray dose of 8000 r to both hind extremities. Amputation of the legs was carried out 2.5, 3, and 6 months after the irradiation, and preparations containing RNA, DNA, or protein were injected into the right hind extremity or into the muscles of the back. The controls were not treated after amputation. Regeneration of the extremity took place in 13% of the cases with amputation 3 months after the irradiation, and in 23.3% of the cases with amputation 6 months after the irradiation. However, with repeated amputation, regeneration took place in 53 to 77% of the cases 6 months after the irradiation. Thus, the factor of shock was more important than the factor of time in restoring regenerative capacity. Commercial RNA and DNA were ineffective. High-molecularweight RNA prepared in the laboratory, and protein preparations were effective in restoring regenerative capacity of the extremities, but the RNA lost its activity on storage for a month and a half. Salamanders given a whole- body, x-ray dose of 1000 r and treated with RNA showed a 37% increase in life span as compared to the controls which were not treated with RNA. (TTT)