gebhart/patrepeval huggingface dataset:
A novel fused metal anode solid electrolyte fuel cell for direct coal gasification: a steady-state model (1989)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA novel fused metal anode solid electrolyte fuel cell for direct coal gasification: a steady-state modelIoannis V. Yentekakis, Pablo G. Debenedetti, and Bruno CostaCite this: Ind. Eng. Chem. Res. 1989, 28, 9, 1414–1424Publication Date (Print):September 1, 1989Publication History Published online1 May 2002Published inissue 1 September 1989https://pubs.acs.org/doi/10.1021/ie00093a022https://doi.org/10.1021/ie00093a022research-articleACS PublicationsRequest reuse permissionsArticle Views189Altmetric-Citations24LEARN 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
Generating realistic <i>impressions</i> for file-system benchmarking (2009)

The performance of file systems and related software depends on characteristics of the underlying file-system image (i.e., file-system metadata and file contents). Unfortunately, rather than benchmarking with realistic file-system images, most system designers and evaluators rely on ad hoc assumptions and (often inaccurate) rules of thumb. Furthermore, the lack of standardization and reproducibility makes file-system benchmarking ineffective. To remedy these problems, we develop Impressions, a framework to generate statistically accurate file-system images with realistic metadata and content. Impressions is flexible, supporting user-specified constraints on various file-system parameters using a number of statistical techniques to generate consistent images. In this article, we present the design, implementation, and evaluation of Impressions and demonstrate its utility using desktop search as a case study. We believe Impressions will prove to be useful to system developers and users alike.
Probing the Binding Domain of the NK2 Receptor with Fluorescent Ligands: Evidence That Heptapeptide Agonists and Antagonists Bind Differently (1995)

We have investigated the interaction of fluorescent peptide ligands with the G protein-coupled receptor NK2 using novel spectrofluorometric approaches. Several heptapeptide antagonists of structure PhCO-Xaa-Ala-D-Trp-Phe-D-Pro-Pro-Nle-NH2 were labelled on position 1 (Xaa) with the environment-sensitive nitrobenzoxadiazole (NBD) probe, differing only in the length of the spacer between the NBD group and the peptide. Upon binding of the labelled antagonist to NK2 receptors stably expressed in Chinese hamster ovary (CHO) cells, an increase in NBD fluorescence was observed when the spacer length was less than 10 A. Collisional quenching experiments using iodide and Co2+ ions were performed to define the accessibility of the NBD group on bound ligands to the solvent. By comparing ligands with spacer arms of varying lengths, we found that the binding pocket is buried at a depth of 5-10 A. In contrast, N-terminally NBD-labelled agonists, decapeptide neurokinin A (NKA) or heptapeptide Nle10-NKA[4-10], bound to the NK2 receptor were accessible to the solvent. Binding of fluorescent ligands to the NK2 receptor was accompanied by an enhancement in the fluorescence anisotropy. The changes in fluorescence properties were used to determine the kinetic parameters of antagonist binding and dissociation. These results indicate that the binding site on the NK2 receptor for the amino-terminal end of the heptapeptide antagonists is buried in the hydrophobic pocket of the receptor protein and clearly distinct from the binding site for the amino-terminal end of agonists, which is accessible to the solvent.(ABSTRACT TRUNCATED AT 250 WORDS)
A Real-Time Attack Localization Algorithm for Large Power System Networks Using Graph-Theoretic Techniques (2015)

We develop a graph-theoretic algorithm for localizing the physical manifestation of attacks or disturbances in large power system networks using real-time synchrophasor measurements. We assume the attack enters through the electro-mechanical swing dynamics of the synchronous generators in the grid as an unknown additive disturbance. Considering the grid to be divided into coherent areas, we pose the problem as to localize which area the attack may have entered using relevant information extracted from the phasor measurement data. Our approach to solve this problem consists of three main steps. We first run a phasor-based model reduction algorithm by which a dynamic equivalent of the clustered network can be identified in real-time. Second, in parallel, we run a system identification in each area to identify a transfer matrix model for the full-order power system. Thereafter, we exploit the underlying graph-theoretic properties of the identified reduced-order topology, create a set of localization keys, and compare these keys with a selected set of transfer function residues. We validate our results using a detailed case study of the two-area Kundur model and the IEEE 39-bus power system.
Structural basis for substrate activation and regulation by cystathionine beta-synthase (CBS) domains in cystathionine β-synthase (2010)

The catalytic potential for H(2)S biogenesis and homocysteine clearance converge at the active site of cystathionine β-synthase (CBS), a pyridoxal phosphate-dependent enzyme. CBS catalyzes β-replacement reactions of either serine or cysteine by homocysteine to give cystathionine and water or H(2)S, respectively. In this study, high-resolution structures of the full-length enzyme from Drosophila in which a carbanion (1.70 Å) and an aminoacrylate intermediate (1.55 Å) have been captured are reported. Electrostatic stabilization of the zwitterionic carbanion intermediate is afforded by the close positioning of an active site lysine residue that is initially used for Schiff base formation in the internal aldimine and later as a general base. Additional stabilizing interactions between active site residues and the catalytic intermediates are observed. Furthermore, the structure of the regulatory "energy-sensing" CBS domains, named after this protein, suggests a mechanism for allosteric activation by S-adenosylmethionine.
New Methods for Detection of Campylobacters in Stool Samples in Comparison to Culture (2011)

Campylobacter species, especially Campylobacter jejuni and Campylobacter coli, are a major cause of human bacterial enteritis. Current detection in stools is done essentially by culture on selective and nonselective media with filtration. These methods were compared to 2 molecular biology methods, an in-house real-time PCR and a multiplex PCR named Seeplex Diarrhea ACE Detection, and 3 immunoenzymatic methods, Premier Campy, RidaScreen Campylobacter, and ImmunoCard Stat!Campy. Out of 242 stool specimens tested, 23 (9.5%) fulfilled the positivity criteria, i.e., they were positive by one or both culture methods or, in case of a negative culture, by a positive molecular method and a positive immunoenzymatic method. The striking feature of this study is the low sensitivity of culture, in the range of 60%, in contrast to immunoenzymatic and molecular tests.
El director de arte en la configuración de los equipos creativos: proceso creativo y acceso a las agencias de publicidad (2017)

Diversos factores transforman la actividad publicitaria y provocan cambios estructurales en los departamentos de la agencia de publicidad. Este artículo analiza las percepciones de los profesionales publicitarios a cerca de la vigencia del director de arte en la configuración del equipo creativo y su papel en el proceso creativo, así como cuáles son los mecanismos de acceso a esta industria. Este estudio se ha llevado a cabo a partir de la encuesta ‘Formación en Dirección de Arte en España’ completada por 85 directores de arte y mediante la realización de 10 entrevistas en profundidad realizadas a profesionales de reconocido
Time Course of Cycloplegia Induced by a New Phenylephrine-Tropicamide Combination Drug (1990)

A motorized and computer-interfaced phoropter was used to track the development of cycloplegia and recovery of accommodation over a 60-min period, after the topical application of a phenylephrine 5%-tropicamide 0.8% drug combination (Phenyltrope). Phenyltrope was introduced into the Canadian market about 2 years ago (Compendium of Pharmaceuticals and Specialties, 1987), and advertised as a fast acting cycloplegic and mydriatic drug. Here we report the results of our investigation of the depth of action and the temporal aspects of cycloplegia for this drug combination as a function of iris color. We also compare the action spectrum of Phenyltrope to that of tropicamide 1% under similar test conditions. Our results indicate that the latency for cycloplegia was shorter for tropicamide, the maximum rate of accommodative loss similar for both drugs, and the resultant cycloplegia at 20 min deeper for Phenyltrope. Recovery from induced cycloplegia was greater for tropicamide 60 min after drug administration. For both Phenyltrope and tropicamide, no significant differences in any of the parameters investigated were observed as a function of iris color. We conclude that even though Phenyltrope induced a measurably deeper cycloplegia than did tropicamide, the amount of residual accommodation present at 20 min (about 38%) is insufficient for most refractive purposes.
The ALA glossary of library and information science (1983)

The ALA glossary of library and information science , The ALA glossary of library and information science , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی
Synthesizing object receiving motions of humanoid robots with human motion database (2013)

This paper presents a method for synthesizing motions of a humanoid robot that receives an object from a human, with focus on a natural object passing scenario where the human initiates the passing motion by moving an object towards the robot, which continuously adapts its motion to the observed human motion in real time. In this scenario, the robot not only has to recognize and adapt to the human action but also has to synthesize its motion quickly so that the human does not have to wait holding an object. We solve these issues by using a human motion database obtained from two persons performing the object passing task. The rationale behind this approach is that human performance of such a simple task is repeatable, and therefore the receiver (robot) motion can be synthesized by looking up the passer motion in a database. We demonstrate in simulation that the robot can start extending the arm at an appropriate timing and take hand configurations suitable for the object being passed. We also perform hardware experiments of object handing from a human to a robot.
An empirical study of the uptake of performance measurement by Internet retailers (2008)

Purpose The purpose of this paper is twofold: to identify levels of uptake of performance measurement by small and medium‐sized retail companies selling goods online, and to determine key factors, which could explain any variation in use of performance indicators. The study is designed to explore these issues by this type of retailer as currently understanding is fairly limited. Design/methodology/approach A quantitative mail questionnaire was used to survey UK retailers selling goods online. The questionnaire examined the uptake of performance measurement in conjunction with the business profile of each of the 252 responding companies. Findings The results show great variation in levels and extent of uptake of performance measurement by online retailers in the UK. Company profile variables: size and operating format help to account for the variation in the number of indicators measured. Research limitations/implications The sample frame has some limitations insofar as the study only focused on small and medium‐sized retailers in the UK selling tangible goods. Future research could be extended to include larger and pan‐European retailers selling both tangible and intangible goods. Furthermore, the data collection was cross‐sectional and, whilst this approach was important at this stage in order to provide a picture of how performance measurement is being applied at a given point in time, a longitudinal study would enable greater analysis of strategic impact of performance measurement. Practical implications Currently, retailers' performance measurement activities mainly focus on gathering data using financial and Website functionality indicators. From a strategic planning perspective, this could suggest that retailers are adopting a short‐term pragmatic approach towards retailing online. The implications are that performance measurement is being used as a means to ensure that Internet retailing is not having a detrimental effect on business performance rather than driving longer‐term strategy development. Originality/value The principal contributions of this paper are that it has provided insight into the current status of performance measurement amongst UK Internet retailers and has identified a useful checklist of performance indicators which retailers can apply to gain a comprehensive view of business performance online.
The Combined Use of Known Antiviral Reverse Transcriptase Inhibitors AZT and DDI Induce Anticancer Effects at Low Concentrations (2012)

A hallmark of tumor cell survival is the maintenance of elongated telomeres. It is known that antiviral reverse transcriptase inhibitors (RTIs) such as azidothymidine (AZT) and didanosine (ddI) lead to telomere shortening at high, potentially toxic concentrations. We hypothesized that those drugs might have synergistic effects enabling successful therapy with low, nontoxic concentrations. Biologic effects of AZT and ddI were analyzed at concentrations that correspond to minimal plasma levels achieved during human immunodeficiency virus therapy. Long-term coapplication of low-dose AZT and ddI induced a significant shortening of telomeres in the tumor cell lines HCT-116, SkMel-28, MelJuso, and Jurkat. Treatment of cells with both RTI, but not with single RTI, led to a significant accumulation of γH2AX, to p53 phosphorylation, and to cell apoptosis in all cell lines. Oral low-dose dual RTI application but not low-dose single RTI application was associated with a significantly reduced tumor growth of HCT-116 cells in mice. This antiproliferative activity of the combined use of AZT and ddI at low, clinically applicable concentrations warrants clinical testing in human solid cancer.
Experimental Investigation of Optical Breakdown Thresholds in Ocular Media under Single Pulse Irradiation with Different Pulse Durations (1986)

Curves of probability of occurrence of optical breakdown have been plotted in respect to measurements carried out in liquids used as models for ocular media. These studies also included exposures in calf vitreous.\nThe Nd:YAG lasers used were able to deliver single pulses at the fundamental wavelength with three different\npulse durations, i.e., 7 ns.220 and 30 ps respectively, in three different focusing conditions. The results show\nthat breakdown threshold intensities increase substantially with decreasing the pulse duration, an observation\nsimilar to that found in solids. In addition, breakdown curves obtained with picosecond pulses are steeper\nthan those obtained with nanosecond pulses, thus showing that with shorter pulses the process of onset of\nbreakdown is more deterministic. Impurities are shown to play a decreasing role in the initiation of the process of optical breakdown as the pulse duration is decreased.\nFinally it has been found that, with tight focusing, the breakdown threshold intensity increases much more\nwith picosecond pulses than with nanosecond pulses.\nThe importance of these observations both for the characterization of different laser disruptors and for\nthe clinical use of the Nd:YAG laser in ophthalmic microsurgery will be discussed.
Efficient algorithms for folding and comparing nucleic acid sequences (1982)

Fast algorithms for analysing sequence data are presented. An algorithm for strict homologies finds all common subsequences of length greater than or equal to 6 in two given sequences. With it, nucleic acid pieces five thousand nucleotides long can be compared in five seconds on CDC 6600. Secondary structure algorithms generate the N most stable secondary structures of an RNA molecule, taking into account all loop contributions, and the formation of all possible base-pairs in stems, including odd pairs (G.G., C.U., etc.). They allow a typical 100-nucleotide sequence to be analysed in 10 seconds. The homology and secondary structure programs are respectively illustrated with a comparison of two phage genomes, and a discussion of Drosophila melanogaster 55 RNA folding.
Poor maternal care and high maternal body mass index in pregnancy as a risk factor for schizophrenia in offspring (2004)

Poor maternal care during pregnancy and comparatively high maternal BMI especially at early pregnancy may cause a predisposition to schizophrenia in the offspring.
The use of carbon aerogel electrodes for environmental cleanup (1996)

An electrochemical cell with a stack of carbon aerogel electrodes has been used to remove a variety of contaminants from aqueous waste streams and natural waters. In the case of non-reducible and non-oxidizable salt solutions, the cell is operated in a capacitive mode. Electrolytic or electrophoretic deposition is used for the removal of heavy metals. The removal of NaNO{sub 3} from water with subsequent concentration is an example of capacitive operation. Electrodialysis with bipolar membra Na{sup +}s can be used to separate neutral salt solutions into their acid and base components so that recycle is possible, thereby lowering risk to the environment. Carbon aerogel electrodes can be used to remove NaNO{sub 3} from the effluent, concentrating it for recycle to the electrodialysis cell. Solutions are passed through a stack of carbon aerogel electrodes, each having a very high specific surface area (400 to 1100 m{sup 2} g{sup -1}) and very low electrical resistivity (less than 40 m{Omega}-cm). After polarization, Ne cations and NO{sub 3}-anions are removed from the electrolyte by the imposed electric field and held in electric double layers formed at the surfaces of electrodes. Two streams are produced, pure water and NaNO{sub 3} concentrate. This process is alsomore » capable of removing other impurities such as dissolved heavy metals and suspended colloids. In these cases, contaminants are removed by electrodeposition and electrophoresis, respectively. The carbon aerogel cell has been used for the separation of copper, zinc, cadmium, and lead from 0.1 M KNO{sub 3} solutions, as well as for the separation of cobalt, chromium, manganese, lead, and uranium from sea water. Treatability tests on ground water at LLNL have shown that chromium contamination can be reduced from 32 to 2 ppb, well below the acceptable level of 11 ppb.« less
Call Setup Delay Analysis of H.323 and SIP (2011)

IP Telephony is a technology which uses internet and signalling protocols like H.323 and SIP to setup and transfer voice signals from one destination to another. These protocols use various encoding schemes to transmit voice signals over the digital technology. The success of IP Telephony is the cost and time effectiveness; hence we studied on the call setup delay of these two signaling protocols H.323 and SIP. H.323 uses TCP and SIP uses UDP as transport protocols to set up a call. They have different scopes that distinguish them. The signalling protocols H.323 and SIP call setup delays are observed and studied successfully between the traditional telephones and IP telephones. The call setup delay for H.323 is analysed experimentally in the Cisco environment by establishing calls at various loads such as null load, medium load and heavy load. Due to practical difficulties the SIP call setup delay is studied only literally. The parameters that we considered for our experiments are the average call setup delay, bandwidth and different traffic loads. Finally, the results of both H.323 and SIP are compared with each other to find out the best signalling protocol. The comparison is done according to the call setup delay and other factors like complexity, compatibility, reliability and bandwidth utilization.
Analysis of system overhead on parallel computers (2005)

Ever-increasing demand for computing capability is driving the construction of ever-larger computer clusters, typically comprising commodity compute nodes, ranging in size up to thousands of processors, with each node hosting an instance of the operating system (OS). Recent studies [E. Hendriks (2002), F. Petrini et al. (2003)] have shown that even minimal intrusion by the OS on user applications, e.g. a slowdown of user processes of less than 1.0% on each OS instance, can result in a dramatic performance degradation - 50% or more - when the user applications are executed on thousands of processors. The contribution of this paper is the explication and demonstration by way of a case study, of a methodology for analyzing and evaluating the impact of the system (all software and hardware other than user applications) activity on application performance. Our methodology has three major components: 1) a set of simple benchmarks to quickly measure and identify the impact of intrusive system events; 2) a kernel-level profiling tool Oprofile to characterize all relevant events and their sources; and, 3) a kernel module that provides timing information for in-depth modeling of the frequency and duration of each relevant event and determines which sources have the greatest impact on performance (and are therefore the most important to eliminate). The paper provides a collection of experimental results conducted on a state-of-the-art dual AMD Opteron cluster running GNU/Linux 2.6.5. While our work has been performed on this specific OS, we argue that our contribution readily generalizes to other open source and commercial operating systems.