gebhart/patrepeval huggingface dataset:
Projection, size factors, and reaction dynamics of colloidal redox catalysts mediating light induced hydrogen evolution from water (1979)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProjection, size factors, and reaction dynamics of colloidal redox catalysts mediating light induced hydrogen evolution from waterJ. Kiwi and M. GraetzelCite this: J. Am. Chem. Soc. 1979, 101, 24, 7214–7217Publication Date (Print):November 1, 1979Publication History Published online1 May 2002Published inissue 1 November 1979https://pubs.acs.org/doi/10.1021/ja00518a015https://doi.org/10.1021/ja00518a015research-articleACS PublicationsRequest reuse permissionsArticle Views1751Altmetric-Citations381LEARN 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
Optimization of the motion estimation for parallel embedded systems in the context of new video standards (2012)

The effciency of video compression methods mainly depends on the motion compensation stage, and the design of effcient motion estimation techniques is still an important issue. An highly accurate motion estimation can significantly reduce the bit-rate, but involves a high computational complexity. This is particularly true for new generations of video compression standards, MPEG AVC and HEVC, which involves techniques such as different reference frames, sub-pixel estimation, variable block sizes. In this context, the design of fast motion estimation solutions is necessary, and can concerned two linked aspects: a high quality algorithm and its effcient implementation. This paper summarizes our main contributions in this domain. In particular, we first present the HME (Hierarchical Motion Estimation) technique. It is based on a multi-level refinement process where the motion estimation vectors are first estimated on a sub-sampled image. The multi-levels decomposition provides robust predictions and is particularly suited for variable block sizes motion estimations. The HME method has been integrated in a AVC encoder, and we propose a parallel implementation of this technique, with the motion estimation at pixel level performed by a DSP processor, and the sub-pixel refinement realized in an FPGA. The second technique that we present is called HDS for Hierarchical Diamond Search. It combines the multi-level refinement of HME, with a fast search at pixel-accuracy inspired by the EPZS method. This paper also presents its parallel implementation onto a multi-DSP platform and the its use in the HEVC context.
Controllable spin-dependent transport in armchair graphene nanoribbon structures (2009)

Using the nonequilibrium Green’s functions formalism in a tight binding model, the spin-dependent transport in armchair graphene nanoribbons controlled by a ferromagnetic gate is investigated. Beyond the oscillatory behavior of conductance and spin polarization with respect to the barrier height, which can be tuned by the gate voltage, we especially analyze the effects of width-dependent band gap and of the nature of contacts. The oscillation of spin polarization in graphene nanoribbons with a large band gap is strong in comparison with that in infinite graphene sheets. Very high spin polarization (close to 100%) is observed in normal-conductor/graphene/normal-conductor junctions. Moreover, we find that the difference in electronic structure between normal conductor and graphene generates confined states which have a strong influence on the transport properties of the device. This study suggests that the device should be carefully designed to obtain a high controllability of spin-polarized current.
Synthesis and Structural Characterization of [Cu20Se4(μ3-SePh)12(PPh3)6] and [Ag(SePh)]∞ (2002)

Reaction of lithium phenylselenothiolate, generated in situ from the reductive cleavage of PhSe-SiMe3 with alkyl lithium reagents and insertion of elemental sulfur, with triphenylphosphine solubilized CuCl affords the molecular cluster complex [Cu20Se4 (μ3-SePh)12(PPh3)6] (1). The analogous reaction with AgCl yields the extended structure [Ag(SePh)]∞ (2) in which an infinite layer of AgI atoms is capped on either side by μ4-SePh ligands. 1: space group P¯1, a = 17.9510(6), b = 18.1712(7), c = 31.4311(11) Å, a = 78.098(2), β = 82.905(2), γ = 70.012(2)°. 2: space group C2/c, a = 5.8762(6), b = 7.2989(7), c = 29.124(2) Å, β = 95.790(3)°. Synthese und strukturelle Charakterisierung von [Cu20Se4(μ3-SePh)12(PPh3)6] und [Ag(SePh)]∞ Die Reaktion von Lithiumphenylselenothiolat, in situ durch reduktive Spaltung von PhSe—SiMe3 mit Lithiumalkyl-Reagenzien und Insertion elementarem Schwefel gebildet, mit in Triphenylphosphan gelöstem CuCl ergibt den molekularen Clusterkomplex [Cu20Se4(μ3-SePh)12(PPh3)6] (1). Die analoge Reaktion mit AgCl ergibt [Ag(SePh)]∞ (2) mit einer unendlichen Schicht von AgI-Atomen, die an jeder Seite durch μ4-SePh-Liganden abgedeckt ist. Raumgruppe P1¯, a = 17, 9510(6), b = 18, 1712(7), c = 31, 4311(11) Å, a = 78, 098(2), β = 82, 905(2), γ = 70, 012(2)°. 2: Raumgruppe C2/c, a = 5, 8762(6), b = 7, 2989(7), c = 29, 124(2) Å, β = 95, 790(3)°.
A Compact I/Q Upconversion Chain for a 5G Wireless Transmitter in 65-nm CMOS Technology (2020)

A compact in-phase/quadrature (I/Q) upconversion chain with high linearity is presented for an integrated transceiver for 5G mobile communications. The upconverter includes 10-11.5-GHz upconversion chains, a quadrature signal generator (QSG) consisting of the two coupled current-mode logic latches, and inverting amplifiers to provide the rail-to-rail local oscillator (LO) swing with a 25% duty cycle for I/Q mixers which achieved 46.9 dB of image rejection ratio. A cross-coupled pair operating at weak inversion was used at the output of the upconverter and it improved the output of the third-order intercept point (OIP3) by 2.58 dB. The upconverter achieved a transmitter gain of 9.12 dB and an OIP3 of 14.45 dBm. The implemented I/Q upconverter with the QSG consumes 48.7 mW under a 1-V supply, and it occupies only 0.57 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> of chip area including pads.
Ion-graphy implanter with stencil mask (2002)

Recently, the demand for semiconductor devices has been greatest in the consumer market for such products as video games, cellular phones, and DVD players. In order to satisfy these demands, semiconductor manufacturers are now designing new production lines, such as mini fabs, to decrease the processing time for various types of semiconductor devices. Over the past few decades, the availability and throughput of ion implanters have improved dramatically. However, the implantation process itself has, except for a slight change, remained basically the same. A recent article (Ref. 1) describes the basic concept of an ion-implantation process that does not require use of a photoresist mask. This article reports the experimental data and the basic functions of a type of ion implanter currently being developed. This implanter implants ions in one chip at a time through a stencil mask without the use of a photoresist mask. This ion-implantation technology, called stencil mask ion implantation technology, and the ion implanter, called a stencil mask lithographic ion implanter, will be exceptionally suitable for future semiconductor manufacturing processes.
A comparison between single code and multiple code transmission schemes in a CDMA system (2002)

Two transmission schemes for the mobiles in a CDMA system are compared. In the first scheme which is used presently, referred to as the single code scheme, transmission is achieved by using a single spreading code. In the other, called the multi-code scheme, the bit stream to be transmitted is split into several parallel streams. Each stream is then spread by a code out of a set of orthogonal codes, and then transmitted in parallel. It is shown that despite the dynamic range requirements being quite different, the interference properties of these two schemes, which affect the bit error rate, are identical.
Rapid formation of inositol 1,3,4,5-tetrakisphosphate following muscarinic receptor stimulation of rat cerebral cortical slices (1985)

Carbachol stimulation of muscarinic receptors in rat cortical slices prelabelled with myo-[2-3H]inositol caused the rapid formation of a novel inositol polyphosphate. Evidence derived from its chromatographic behaviour, and from the structure of the products formed in partial dephosphorylation experiments, suggests that it is probably D-myo-inositol 1,3,4,5-tetrakisphosphate. An enzyme in human red cell membranes specifically removes the 5-phosphate from it to form inositol 1,3,4-trisphosphate. It is suggested that inositol 1,3,4,5-tetrakisphosphate is likely to be a second messenger, and that it is the precursor of inositol 1,3,4-trisphosphate and possibly of inositol 1,4,5-trisphosphate.
Multipath Assisted Positioning with Simultaneous Localization and Mapping (2016)

This paper describes an algorithm that exploits multipath propagation for position estimation of mobile receivers. We apply a novel algorithm based on recursive Bayesian filtering, named Channel-SLAM. This approach treats multipath components as signals emitted from virtual transmitters, which are time synchronized to the physical transmitter and static in their positions. Contrary to other approaches, Channel-SLAM considers also paths occurring due to multiple numbers of reflections or scattering as well as the combination. Hence, each received multipath component increases the number of transmitters resulting in a more accurate position estimate or enabling positioning when the number of physical transmitters is insufficient. Channel-SLAM estimates the receiver position and the positions of the virtual transmitters simultaneously; hence, the approach does not require any prior information, such as a room-layout or a database for fingerprinting. The only prior knowledge needed is the physical transmitter position as well as the initial receiver position and moving direction. Based on simulations, the position precision of Channel-SLAM is evaluated by a comparison to simplified algorithms and to the posterior Cramér-Rao lower bound. Furthermore, this paper shows the performance of Channel-SLAM based on measurements in an indoor scenario with only a single physical transmitter.
Security of SoC firmware load protocols (2014)

The security architecture of modern systems-on-a-chip (SoC) is complex and critical to be done right and quickly. SoC security architects feel an acute need for new tool-supported specification and validation technologies. Aiming to stimulate research into creation of these technologies, in this paper we provide some industrial insights and initial solutions. Focusing on a concrete non-trivial example of security sensitive firmware load protocols, we show how to: (1) concisely specify the communication between IP blocks; (2) model the adversary; (3) debug and verify the protocol.
Randomized clinical trial of three‐layer tubular bandaging system for venous leg ulcers (2012)

The safety and efficacy of three-layer (3L) tubular bandaging as a treatment for venous ulcer healing has not been evaluated despite its use in many clinical settings to treat people with venous leg ulcers. We evaluated the safety and efficacy of 3L tubular bandage compared with short-stretch compression bandage to heal venous ulcers in a multicenter, open-label, parallel-group, randomized controlled trial. We randomized 45 patients with venous leg ulcers of up to 20 cm(2) area and an ankle brachial pressure index of >0.8 from hospital outpatient wound clinics in Victoria and Queensland, Australia. We measured time to healing and percentage reduction of wound size from baseline to week 12. Secondary outcomes were proportion of ulcers healed, self-reported compliance of compression bandage, and health-related quality of life, costs, recurrence rates, and adverse events. A total of 27 ulcers healed, the proportion of healed ulcers was higher for the 3L group (17/23 [74%] vs. 10/22 [46%]) (p = 0.05). Reported bandage tolerance at all treatment visits was 21 (91%) in 3L group vs. 17 (73%) (p = 0.10). There was no difference between the groups in adverse events. Costs were substantially less in 3L group.
Reversible shear thickening at low shear rates of electrorheological fluids under electric fields (2011)

By shearing electrorheological (ER) fluids between two concentric cylinders, we show a reversible shear thickening of ER fluids above a low critical shear rate (<1 s(-1)) and a high critical electric field strength (>100 V/mm), which can be characterized by a critical apparent viscosity. Shear thickening and electrostatic particle interaction-induced interparticle friction forces are considered to play an important role in the origin of lateral shear resistance of ER fluids, while the applied electric field controls the extent of shear thickening. The electric-field-controlled reversible shear thickening has implications for high-performance electrorheological-magnetorheological fluid design, clutch fluids with high friction forces triggered by applying a local electric field, other field-responsive materials, and intelligent systems.
A Novel Preparation of Scalemic N-Methyl-.alpha.-Amino Acids (1995)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Novel Preparation of Scalemic N-Methyl-.alpha.-Amino AcidsR. L. Dorow and Diane E. GingrichCite this: J. Org. Chem. 1995, 60, 16, 4986–4987Publication Date (Print):August 1, 1995Publication History Published online1 May 2002Published inissue 1 August 1995https://pubs.acs.org/doi/10.1021/jo00121a014https://doi.org/10.1021/jo00121a014research-articleACS PublicationsRequest reuse permissionsArticle Views472Altmetric-Citations30LEARN 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 (2)»Supporting Information Supporting Information Get e-Alerts
EFFECT OF THERMAL PROCESSING ON STRUCTURE AND RHEOLOGICAL PROPERTIES OF CARRAGEENAN/CAROB GUM GELS (1980)

ABSTRACT Optical rotatory dispersion and rheological studies have been used to investigate changes in carrageenan and carob gels on thermal processing. A synergistic effect was observed on the gel strength of both unprocessed and heat processed carrageenan carob gels when compared to gels without carob, although a lower gel strength was measured after processing. The reduction in strength of gels on heat processing appears to be due mainly to the depolymerisation of the network chains while the crosslinks of the gel are largely unaffected.
Photocatalytic decomposition of perfluorooctanoic acid in pure water and sewage water by nanostructured gallium oxide (2013)

Due to its global occurrence and environmental persistence, perfluorooctanoic acid (PFOA) has attracted worldwide concerns including its decomposition method. The nanostructured β-Ga2O3 with a novel sheaf-like structure was synthesized via a PVA-assisted hydrothermal method and subsequent heat treatment. The sheaf-like Ga2O3 was self-assembled from nanoplates, possessing a high value of specific surface area (36.1 m2/g) and a large number of nanopores (2–4 nm and 8 nm). Sheaf-like Ga2O3 exhibited a remarkable photocatalytic activity for PFOA decomposition in pure water under 254 nm UV irradiation with the rate constant of 4.85 h−1, which was 16 and 44 times higher than that of commercial Ga2O3 and P25 respectively. This can be attributed to the close bonding between PFOA and Ga2O3, and nanoporous structure of sheaf-like Ga2O3. In addition, in combination of 185 nm vacuum UV irradiation, the sheaf-like Ga2O3 showed high efficiency to remove trace PFOA in the secondary effluent of sewage, in which the decomposition of targeted trace pollutants such as PFOA is generally inhibited by coexisting high-level natural organic matters and bicarbonate.
High-speed and high spectral efficiency coherent optical OFDM (2008)

We show 107 Gb/s CO-OFDM transmission over 1000-km SSMF fiber without optical-dispersion compensation and without Raman amplification. Orthogonal-band-multiplexed-OFDM is proposed to achieve high-speed and high spectral efficiency transmission without requiring extremely high DAC/ADC sampling rate.
The Pathology of Urethral Stricture (1976)

In this 3-part study the distribution of the post-gonococcal stricture has been related to the disposition of mucous glands in paraurethral glands by mapping the distribution of these glands in the human male urethra. Experimental study in the rat has indicated the role of extravasation of urine in the pathogenesis of urethral stricture. Lastly, the ultrastructure of urethral stricture tissue has revealed features that suggest why some strictures are fibrous and others resilient.
Open Source Multi-Head 3D Printer for Polymer-Metal Composite Component Manufacturing (2017)

As low-cost desktop 3D printing is now dominated by free and open source self-replicating rapid prototype (RepRap) derivatives, there is an intense interest in extending the scope of potential applications to manufacturing. This study describes a manufacturing technology that enables a constrained set of polymer-metal composite components. This paper provides (1) free and open source hardware and (2) software for printing systems that achieves metal wire embedment into a polymer matrix 3D-printed part via a novel weaving and wrapping method using (3) OpenSCAD and parametric coding for customized g-code commands. Composite parts are evaluated from the technical viability of manufacturing and quality. The results show that utilizing a multi-polymer head system for multi-component manufacturing reduces manufacturing time and reduces the embodied energy of manufacturing. Finally, it is concluded that an open source software and hardware tool chain can provide low-cost industrial manufacturing of complex metal-polymer composite-based products.
Bone Morphogenetic Protein Receptor Type II Is a Receptor for Growth Differentiation Factor-91 (2002)

Growth differentiation factor-9 (GDF-9) is a glycoprotein secreted by the oocyte that is capable of stimulating granulosa cell proliferation and inhibiting differentiation. GDF-9 is a member of the transforming growth factor beta superfamily of ligands known to signal through type I and II serine/threonine kinase receptors. In the sequenced human genome, seven type I and six type II receptors have been identified. Based on phylogenetic and sequence analyses, we predicted that GDF-9 likely interacts with known type I and type II receptors. We obtained soluble chimeric proteins with the ectodomains of candidate receptors fused to the Fc portion of immunoglobin and tested their ability to act as functional antagonists. Addition of bone morphogenetic protein receptor type II (BMPRII) ectodomain was most effective in blocking GDF-9 stimulation of granulosa cell proliferation and GDF-9 suppression of FSH-stimulated progesterone production. In addition, the ectodomains of bone morphogenetic protein receptor type IA, bone morphogenetic protein receptor type IB, and activin receptor type IIA were partially effective in blocking GDF-9 action. Furthermore, the BMPRII ectodomain directly interacted with GDF-9 in a coprecipitation study demonstrating the role of the BMPRII ectodomain as a binding protein for GDF-9. To demonstrate the role of BMPRII in GDF-9 signaling in follicular cells, the expression of this protein was blocked in cultured granulosa cells using specific BMPRII antisense oligomers. Inhibition of BMPRII biosynthesis completely prevented the GDF-9 induction of granulosa cell thymidine incorporation. GDF-9 expression is essential for early follicle development, and the presence of the type II and type I receptors in the neonatal rat ovary was verified by reverse transcription polymerase chain reaction. These results demonstrate the important role of BMPRII in mediating GDF-9 action in granulosa cells from small antral follicles and indicate that the effects of GDF-9 might be transduced by binding to BMPRII and one or more type I receptors.
Idiotypic network: possible explanation of seronegativity in a patient with rheumatoid arthritis. (1984)

In order to explain long term seronegativity in certain patients with rheumatoid arthritis (RA), we looked for the presence of anti-idiotypic antibodies against rheumatoid factors (RFs). From a patient's serum with classical but seronegative RA, we isolated a low quantity of the IgG fraction which partially recognized polyclonal RF idiotypes. The purified Fab'2 anti-idiotypic antibodies were able to inhibit up to 48% of in vitro RF production by pokeweed mitogen stimulated lymphocytes from a patient's peripheral blood with seropositive RA. The two main conclusions of this study are: (1) this single patient with seronegative RA has serum antibodies directed against RF idiotypes and (2) these anti-idiotypic antibodies could be implicated in the generation of seronegativity.
The lung is a host defense niche for immediate neutrophil-mediated vascular protection (2017)

Bloodstream infection is a hallmark of sepsis, a medically emergent condition requiring rapid treatment. However, upregulation of host defense proteins through toll-like receptors and NFκB requires hours after endotoxin detection. Using confocal pulmonary intravital microscopy, we identified that the lung provides a TLR4-Myd88-and abl tyrosine kinase-dependent niche for immediate CD11b-dependent neutrophil responses to endotoxin and Gram-negative bloodstream pathogens. In an <i>in vivo</i> model of bacteremia, neutrophils crawled to and rapidly phagocytosed <i>Escherichia coli</i> sequestered to the lung endothelium. Therefore, the lung capillaries provide a vascular defensive niche whereby endothelium and neutrophils cooperate for immediate detection and capture of disseminating pathogens.
New High-Intensity Source of Polarization-Entangled Photon Pairs (1995)

We report on a high-intensity source of polarization-entangled photon pairs with high momentum definition. Type-II noncollinear phase matching in parametric down conversion produces true entanglement: No part of the wave function must be discarded, in contrast to previous schemes. With two-photon fringe visibilities in excess of 97%, we demonstrated a violation of Bell's inequality by over 100 standard deviations in less than 5 min. The new source allowed ready preparation of all four of the EPR-Bell states.