gebhart/patrepeval huggingface dataset:
Thiophene C−H Activation as a Chain-Transfer Mechanism in Ethylene Polymerization:  Catalytic Formation of Thienyl-Capped Polyethylene (1999)

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTThiophene C−H Activation as a Chain-Transfer Mechanism in Ethylene Polymerization: Catalytic Formation of Thienyl-Capped Polyethylene†Stéphanie N. Ringelberg, Auke Meetsma, Bart Hessen, and Jan H. TeubenView Author Information Center for Catalytic Olefin Polymerization University of Groningen, Department of Chemistry Nijenborgh 4, 9747 AG Groningen The Netherlands Cite this: J. Am. Chem. Soc. 1999, 121, 25, 6082–6083Publication Date (Web):June 9, 1999Publication History Received14 December 1998Published online9 June 1999Published inissue 1 June 1999https://pubs.acs.org/doi/10.1021/ja984288shttps://doi.org/10.1021/ja984288srapid-communicationACS PublicationsCopyright © 1999 American Chemical SocietyRequest reuse permissionsArticle Views1092Altmetric-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-AlertscloseSupporting Info (1)»Supporting Information Supporting Information SUBJECTS:Alkyls,Hydrocarbons,Metals,Polyethylene,Thiophenes Get e-Alerts
Health Care (1993)

Health Care Get access D. Taylor D. Taylor King's Fund Institute126 Albert Street, London NW1 Search for other works by this author on: Oxford Academic PubMed Google Scholar Rheumatology, Volume 32, Issue suppl_4, June 1993, Pages 5–9, https://doi.org/10.1093/rheumatology/32.suppl_4.5 Published: 17 June 1993
Use of World Wide Web and NCSA Mcsaic at Langley (1994)

A brief history of the use of the World Wide Web at Langley Research Center is presented along with architecture of the Langley Web. Benefits derived from the Web and some Langley projects that have employed the World Wide Web are discussed.
iPad 2 For Dummies (2011)

From the Author: Exciting Features of iOS 5 Send a text, picture, contact, or video to any iPad, iPhone, or iPod touch running iOS 5 using the new iMessage feature in the Messages app. Find iPad editions for magazines and newspapers you already subscribe to with the Newsstand app. Avoid interruptions and view all your alerts in one place whenever you want with Notification Center. Remove red eye, crop, rotate an image, or improve the lighting, contrast, and color balance of your favorite photos using iOS 5's built-in photo-editing tools. Organize your to-do list and send yourself alerts with the new Reminders app. Twitter is now integrated into iOS 5 and lets you tweet directly from Safari, Photos, Camera, YouTube, and more.
Single-crystal synthesis, structure refinement and electrical properties of Li<sub>0.5</sub>CoO<sub>2</sub> (2007)

Single crystals of Li0.5CoO2 were synthesized for the first time by means of a chemical lithium-ion deintercalation process using LiCoO2 single crystals as a parent compound. A single-crystal x-ray diffraction study revealed an ordered superstructure with monoclinic symmetry, that could be assigned to the space group P 2/m. The crystal structure, including anisotropic displacement parameters for each atom, was refined to the conventional values R 1 = 3.1%, wR 2 = 10.9%, and S = 1.16 using 2385 independent reflections in the range sinθ/λ<1.3 A−1. The lithium-ion and vacancy ordering structure in Li0.5CoO2 was clearly revealed in the electron density distribution analyzed by the maximum entropy method (MEM) using the single-crystal x-ray diffraction data. The in-plane electrical resistivity in Li0.5CoO2 measured using the single-crystal specimen was around 2 mΩ cm and approximately temperature independent, suggesting metallic conduction. These findings were very consistent with those obtained by the FLAPW calculations.
Modulation of Spectral Power and Functional Connectivity in Human Brain by Acupuncture Stimulation (2018)

Acupuncture, as an external stimulation, can produce clinical effects via the central nervous system. In order to investigate the modulatory efficacy of acupuncture on brain activity, multichannel EEG signals evoked by acupuncture at "Zusanli" acupoint were recorded from healthy humans in three states: pre-acupuncture, acupuncture, and post-acupuncture. Power spectral density is first used to analyze the EEG power change during acupuncture process. It is found that EEG power significantly increased in the delta and alpha bands under acupuncture and high power level remained in alpha band after acupuncture. Then, we calculated phase lag index to quantify the phase synchronization of pair-wise channels. In acupuncture state, delta and alpha bands exhibit significantly higher synchronization degree than pre-acupuncture state. Additionally, post-effect of acupuncture can be observed in alpha band as high synchronization degree remains in post-acupuncture state. Moreover, functional brain networks converted from synchronization matrix in each band are reconstructed. Acupuncture increases long-range connections between left and right hemispheres and changes the position of main nodes. Graph theory metrics are extracted to explore the change of functional connectivity in different states. The result shows the functional networks in delta and alpha bands are small world networks (SWN) and acupuncture improves the SWN efficiency of functional network.
Siglec-1 Is a Novel Dendritic Cell Receptor That Mediates HIV-1 Trans-Infection Through Recognition of Viral Membrane Gangliosides (2012)

Dendritic cells (DCs) are essential antigen-presenting cells for the induction of immunity against pathogens. However, HIV-1 spread is strongly enhanced in clusters of DCs and CD4(+) T cells. Uninfected DCs capture HIV-1 and mediate viral transfer to bystander CD4(+) T cells through a process termed trans-infection. Initial studies identified the C-type lectin DC-SIGN as the HIV-1 binding factor on DCs, which interacts with the viral envelope glycoproteins. Upon DC maturation, however, DC-SIGN is down-regulated, while HIV-1 capture and trans-infection is strongly enhanced via a glycoprotein-independent capture pathway that recognizes sialyllactose-containing membrane gangliosides. Here we show that the sialic acid-binding Ig-like lectin 1 (Siglec-1, CD169), which is highly expressed on mature DCs, specifically binds HIV-1 and vesicles carrying sialyllactose. Furthermore, Siglec-1 is essential for trans-infection by mature DCs. These findings identify Siglec-1 as a key factor for HIV-1 spread via infectious DC/T-cell synapses, highlighting a novel mechanism that mediates HIV-1 dissemination in activated tissues.
Truncated power control in code-division multiple-access communications (2000)

We analyze the performance of truncated power control in a code-division multiple-access (CDMA) communication system. This power control scheme compensates for propagation gain above a certain cutoff fade depth: below the cutoff level, data transmission is suspended. We assume a channel with fast Rayleigh fading and slow lognormal shadowing plus path loss, where truncated power control is applied to the shadowing plus path loss and a RAKE receiver combines the Rayleigh fading multipath components separated by more than a chip time. We find that truncated power control exhibits both a power and capacity gain. These performance improvements result from the fact that with truncated power control, less power is wasted compensating for deep fading, and mobiles on the cell boundaries cause less interference to adjacent cells. We find that truncated power control is most effective for channels with large power fluctuations or with large background noise.
Optimized and iterative Wiener filter for image restoration (2009)

Two new techniques were suggested in this research. The first one is for optimizing image restoration with Wiener filter by suggesting an efficient method for estimating an optimum value for the signal to noise ratio parameter used in Wiener filter restoration formula. The estimated value is different for each segment in frequency domain. Estimation depends on the degraded image only, without any prior knowledge about noise level in the degraded image. The second technique uses the above optimized Wiener filter iteratively to reduce the artifacts that normally appears in the restored image. Restoration using these techniques shows very good results for different degraded images.
Depth analysis of metal coatings by glow discharge spectrometry with an argon—helium gas mixture (1989)

Abstract Depth profiles of Cu/Ni, Zn/Fe and Ni/Fe metal coatings obtained with a Grimm glow discharge lamp using an argon—helium gas mixture and pure argon gas were compared. Copper and zinc showed a large increase in intensity for the argon‐helium gas mixture, but Ni showed a small decrease. The sputter time for all three coating metals almost doubled, indicating a smaller sputtering rate for the argon—helium gas mixture. A broadened interface due to the different manner in which the surface was eroded was also observed for the argon—helium sputtered profiles. Intensity enhancement in Cu and Zn was explained by the higher excitation and ionization potential of helium and the simple energy levels (simple spectra) of these elements. On the other hand, the dense energy levels of the Ni atom (complex spectra) does not lead to intensity enhancement.
A membrane protein from human erythrocytes involved in anion exchange (1975)

Phosphate transport across the membrane of human erythrocytes, at pH 6.42, is a saturable process with an external Km of 80 mM and a Vmax of 2.8 mmol per liter of red cells per min. Transport is inhibited in a reversible manner by the sulfanilate anion and in an irreversible manner by the isothiocyanate derivative of the sulfanilate anion. This reagent reacts with only one membrane protein. When 300,000 molecules of reagent per cell are covalently attached to protein, transport is completely inhibited. This transport protein is a glycoprotein, it belongs to the general class designated as component a by Bretscher, and it therefore spans the bilayer. Transport does not involve movement of the protein around an axis parallel to the plane of the membrane.
<title>Selection devices for field-sequential stereoscopic displays: a brief history</title> (1991)

The historical development of shutters employed in selection devices used for field-sequential electro-stereoscopic displays is traced. The discussion encompasses mechanical shuttering systems used for motion pictures and vector computer graphics displays, and early electro- optical shuttering systems using PLZT ceramic material. The art of electro-stereoscopy was advanced with the introduction of the surface mode liquid crystal device, which is ten times faster than the prior and more commonly employed twisted nematic device. The types of surface mode devices are described, including those mounted in front of display screens used in conjunction with passive glasses, and the achromatic shutter used in the latest wireless active shuttering eyewear.
Whirl Dynamics of a Rotor Partially Filled With Liquid (1968)

A spinning rotor, mounted on an elastic shaft and containing a symmetrically located cylindrical chamber partially filled with liquid, is assumed to undergo a small whirling motion. In the analysis, rotor unbalance, gravity, and gyroscopic terms are considered negligible, and the liquid motion is taken as being axially uniform. The added liquid produces a lowering of the usual synchronous critical speed. In addition, waves in the liquid layer couple with rotor whirl motion to produce a range of self-excited asynchronous whirl speeds above the critical, similar to those observed for nonsymmetrical solid rotors. Experiments completely corroborate the analytical results.
Shock Loading on a Wing Type Structure (1993)

Finite Element Methods provide a cost effect means to study the dynamic behaviour of complex structures from various forms of loading, especially for scenarios where it may be impractical to carry out experimental tests. This paper will investigate the dynamic structural response on a wing type structure when subjected to a shock loading in the form of an enforced motion versus time function. The complex structure consists of three types of materials, a basic metallic frame, a foam core and an outer glass reinforced plastic skin. The shock loading is applied in the plane of the structure and is of a few milliseconds duration. Firstly, the dynamic behaviour resulting from the shock loading on the system will be examined and then compared with what would happen to the systems structural response if the stiffness of the foam were reduced. The DYNA3D explicit, non linear finite element code, a product from the Lawrence Livermore National Laboratory was used to analysis the structural response.
Real-Time Quantitative Analysis of Combustion-Generated Polycyclic Aromatic Hydrocarbons by Resonance-Enhanced Multiphoton Ionization Time-of-Flight Mass Spectrometry (1997)

We have combined resonance-enhanced multiphoton ionization (REMPI) time-of-flight mass spectrometry with on-line flame sampling to determine the centerline concentrations of naphthalene, fluorene, and anthracene in a pure methane + oxygen/argon (1:5) diffusion flame. Naphthalene concentrations between 100 parts per billion by volume (ppbV) and 6 parts per million by volume (ppmV) and fluorene concentrations below 50 ppbV are determined using one-color REMPI on jet-cooled samples extracted from the flame; anthracene concentrations in the 5-40 ppbV range are determined using two-color REMPI. The REMPI ion signals are converted to absolute concentrations in real time by performing gas-phase standard additions to the flame sample. Isomer-selective detection of larger polycyclic aromatic hydrocarbons, such as perylene and benzo[a]pyrene, is possible using the two-color REMPI approach.
Improved Understanding of Acid Wormholing in Carbonate Reservoirs Through Laboratory Experiments and Field Measurements (2018)

Abstract A comprehensive study on wormholing has been conducted to improve the understanding of matrix acidizing in carbonate reservoirs. This work is a continuation of previous work (Furui et al. 2012a, 2012b). An analysis of additional experimental results as well as field measurements is provided to reinforce and extend the wormhole penetration model and productivity benefits provided by Furui et al. (2012b). A series of small block tests and one large block test under geomechanical stresses has been conducted to characterize wormholing in outcrop chalk samples. In addition, field data including acid pumping data as well as post-stimulation pressure falloff data has been collected and analyzed to evaluate stimulation effectiveness. Pressure buildup data from stimulated wells has also been analyzed to evaluate the sustainability of the acid induced skin benefits. Production logging data has been used to investigate whether created wormhole networks have remained stable or have collapsed under production stresses. To statistically analyze the data more comprehensively, the new data was also compared to the data from other field data available in the literature. The following conclusions are drawn from an analysis of the laboratory data and field data: 1) a skin value of −4 is achievable in carbonate reservoirs by matrix acidizing, 2) the negative acid skin is relatively stable under production stresses, 3) the wormhole penetration model is proven to successfully simulate matrix acidizing processes in both laboratory scale and field scale work, 4) the small and large block laboratory tests re-confirmed wormholing efficiency which was discussed as a scale effect in previous studies, 5) an understanding of the possible range of wormhole penetration has allowed us to improve field acid treatments and reduce the risk of connecting to water. This comprehensive study includes acid linear core flooding tests, small block tests, large block tests and field measurements to thoroughly analyze acid wormholing in carbonate rock. The database can be very useful information for understanding, benchmarking and optimizing future completion/stimulation design.
ConXsense - Context Sensing for Adaptive Usable Access Control (2013)

In this paper, we present the design and imple- mentation of ConXsense, a framework utilizing context sensing for easy-to-use and adaptive context-aware access control for mobile devices. Previous work often require either users to laboriously specify detailed policies or they rely on pre-specified, non-personalized and error-prone policies for generic context classes. Recent approaches attempt to address these deficiencies by learning from context data. Our approach improves on this by using context data to automatically estimate the sensitivity and safety of the user's context and using the estimates for dynami- cally enforcing access control rules in a highly personalized, non- intrusive and usable manner. Our initial implementation of the framework addresses two smartphone-related problem scenarios for context-aware access control: 1) how to prevent unauthorized apps (like sensory malware) from gathering information about the context of a mobile device (contextual privacy) and 2) how to protect the data and applications on the device from physical threats in the context (like thieves or device misuse by others). We start with a sociological user study, and use its results to inform the design and implementation of ConXsense. We carry out a data collection and analysis study based on which we evaluate the effectiveness and accuracy of ConXsense. Moreover, we integrate ConXsense with a fine-grained access control architecture and show how it can effectively protect against sensory malware as well as device theft and misuse.
Total Synthesis of Microsclerodermin E. (2004)

Abstract For Abstract see ChemInform Abstract in Full Text.
A 1Mb CMOS EPROM with a 13.5 µm<sup>2</sup>cell (1987)

A 64K×16b EPROM with an access time of 159ns will be reported. Buried diffusion reduces the number of array contacts to one every 16b. The circuit includes eight test features and requires a program time of 65ns for the complete array.
Characterization of Laser-Induced Acoustic Desorption Coupled with a Fourier Transform Ion Cyclotron Resonance Mass Spectrometer (2006)

Several experimental factors have been investigated that influence the efficiency of desorption and subsequent chemical ionization of nonvolatile, thermally labile molecules during laser-induced acoustic desorption/Fourier transform ion cyclotron resonance mass spectrometry (LIAD/FT-ICR) experiments. The experiments were performed by using two specially designed LIAD probes of different outer diameters (1/2 and 7/8 in.) and designs. Several improvements to the design of the "first generation" (1/2 in.) LIAD probe are presented. The larger diameter (7/8 in.) probe provides a larger surface area for desorption than the smaller diameter probe. Further, it was designed to desorb molecules on-axis with the magnetic field of the instrument. This is in contrast to the smaller probe for which desorption occurs 1.3 mm off-axis. This improved alignment, which provides better overlap between the desorbed molecules and trapped reagent ions, results in a substantial increase in the sensitivity of LIAD analyses. The thickness of the sample layer deposited on the irradiated metal foil and the number of laser shots fired on the backside of the foil were found to have a significant effect on the overall signal and the relative abundances of the ions formed in the experiment. Evaporation of a tetrapeptide, Val-Ala-Ala-Phe (VAAF), from Ag, Al, Au, Cu, Fe, and Ti foils, followed by protonation by protonated pyridine, revealed that the titanium foil provides the greatest signal. The importance of the laser power density was examined by desorbing a low MW polymer, polyisobutenyl succinic anhydride, at power densities ranging from 5.40 x 10(8) to 9.00 x 10(8) W/cm(2) at the backside of the foil. Higher laser power densities resulted in greater signals and an improved distribution for the higher molecular weight oligomers.
Synthesis of Precursors for Medium‐Ring Aromatic Lactones. (2005)

Abstract For Abstract see ChemInform Abstract in Full Text.
ANTIBODIES TO HERPESVIRUS HOMINIS TYPES 1 AND 2 IN HUMANS1 (1970)

Journal Article ANTIBODIES TO HERPESVIRUS HOMINIS TYPES 1 AND 2 IN HUMANS: I. PATIENTS WITH GENITAL HEHPETIC INFECTIONS Get access ANDRE J. NAHMIAS, ANDRE J. NAHMIAS Search for other works by this author on: Oxford Academic PubMed Google Scholar WILLIAM E. JOSEY, WILLIAM E. JOSEY Search for other works by this author on: Oxford Academic PubMed Google Scholar ZUHER M. NAIB, ZUHER M. NAIB Search for other works by this author on: Oxford Academic PubMed Google Scholar CAROLYN F. LUCE, CAROLYN F. LUCE Search for other works by this author on: Oxford Academic PubMed Google Scholar ANTOINETTE DUFFEY ANTOINETTE DUFFEY Search for other works by this author on: Oxford Academic PubMed Google Scholar American Journal of Epidemiology, Volume 91, Issue 6, June 1970, Pages 539–546, https://doi.org/10.1093/oxfordjournals.aje.a121165 Published: 01 June 1970 Article history Received: 04 January 1970 Published: 01 June 1970
LPG Storage at Mont Belvieu, Texas: A Case History (1993)

Summary The Barbers Hill salt dome contains 124 solution-mined, liquified-petroleum-gas (LPG) storage wells with a capacity of 200 × 106 bbl. A geomechanics evaluation of the facility is described that includes mechanical testing of salt and caprock core, structural evaluation of the storage and brine disposal wells, and development of a subsidence evaluation network.