gebhart/patrepeval huggingface dataset:
Reaction of trialkyl phosphites with organic trisulfides. Synthetic and mechanistic aspects (1979)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReaction of trialkyl phosphites with organic trisulfides. Synthetic and mechanistic aspectsDavid N. Harpp and Roger A. SmithCite this: J. Org. Chem. 1979, 44, 23, 4140–4144Publication Date (Print):November 1, 1979Publication History Published online1 May 2002Published inissue 1 November 1979https://pubs.acs.org/doi/10.1021/jo01337a026https://doi.org/10.1021/jo01337a026research-articleACS PublicationsRequest reuse permissionsArticle Views438Altmetric-Citations25LEARN 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
Effects of filter concatenation for directly modulated transmission lasers at 2.5 and 10 Gb/s (2002)

We report computer simulation results of the effects on optical signal quality of passage through a cascade of wavelength division multiplexing (WDM) filters-multiplexers and demultiplexers-for directly modulated lasers with different chirp characteristics. In particular, lasers with transient or adiabatic chirp characteristics at 2.5 Gb/s and 10 Gb/s are investigated, and we find clear differences between the laser types with respect to filter concatenation effects. Filters with an optical bandwidth suitable for a 200-GHz channel-spacing system are considered, and we evaluate the system behavior as a function of laser frequency offset for a fixed number of filters. The reference network architecture used for the simulations is an optically transparent metropolitan scale network in which the WDM signals may be demultiplexed and then multiplexed again at multiple optical network elements. The signal quality is evaluated in terms of a distortion-induced eye-closure penalty as well as the excess attenuation or loss suffered. We find that transient chirp-dominated lasers show a generally symmetric distortion penalty response to laser frequency offset, whereas the response for adiabatic chirp dominated lasers is highly asymmetric. Furthermore, the extinction ratio for the latter class of lasers can be improved, in some cases, by the appropriate offset between laser and filter center frequencies.
1.5 Gbit/s/channel operation of multiple-wavelengthvertical-cavityphotonic integrated emitter arrays for low-cost multimode WDMlocal-area networks (1998)

The authors demonstrate 1.5 Gbit/s/channel error-free (bit error rate < 10–13) on-chip operation of unpackaged multiple-wavelength photonic integrated emitter arrays for short-haul (≤ 300 m) multimode fibre wavelength-division multiplexing applications. The observed performance has been mainly limited by our simple coaxial probe and receiver bandwidth.
Masking of messenger RNA by Y-box proteins (1996)

The Y-box proteins are defined by their ability to bind to Y-box promoter elements and to help regulate transcription of a wide variety of genes. However, Y-box proteins are also identified as abundant proteins in the cytoplasm of germ cells, where they are found bound to stored mRNA molecules. Binding of Y-box proteins to mRNA sequences, both in vitro and in vivo, has been shown to effect their translational repression ("masking"). Here we discuss the ability of Y box proteins to recognize different nucleic acid structures and to become involved in regulation of both transcription and translation.
An 8&#x03A9; 2.5W 1%-THD 104dB(A)-dynamic-range Class-D audio amplifier with an ultra-low EMI system and current sensing for speaker protection (2012)

Class-D amplifiers for portable devices are typically specified for supply voltage range ideal for use with lithium batteries [1-4]. The high efficiency of Class-D amplifiers makes them ideal for operation from boosted supplies. Moreover, in order to provide a better user experience in all multi-media applications, the new smart-phones and tablets are demanding for output peak power of higher than 2W on 8Ω integrated speakers. In addition, new speakers can achieve better linearity and sensitivity leading to lower THD and noise specification for the amplifier.
Uranium Recovery from Wet Process Phosphoric Acid (1957)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUranium Recovery from Wet Process Phosphoric AcidBruce F. Greek, Otis W. Allen, and Donald E. TynanCite this: Ind. Eng. Chem. 1957, 49, 4, 628–638Publication Date (Print):April 1, 1957Publication History Published online1 May 2002Published inissue 1 April 1957https://pubs.acs.org/doi/10.1021/ie50568a020https://doi.org/10.1021/ie50568a020research-articleACS PublicationsRequest reuse permissionsArticle Views252Altmetric-Citations20LEARN 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
Analysis of Ferroresonance Modes in Power Transformers Using Preisach-Type Hysteretic Magnetizing Inductance (2007)

The magnetic hysteresis phenomenon plays an important role in the ferroresonance behavior of a transformer. However, most existing transformer models for the analysis of the ferroresonance phenomenon either ignore the hysteresis effects or represent it based on the hysteresis major loop and scale it for lower current levels. Such a modeling approach does not reflect the actual physical behavior of the magnetic core with respect to the ferroresonance phenomenon. This paper, based on Preisach theory, introduces an accurate model of hysteretic inductor to represent a single-phase transformer for the investigation of the ferroresonance phenomenon. Based on the developed model, time-domain simulation studies show that even in the case of a single-phase transformer where no magnetic coupling exists between the three-phases, all known types of ferroresonance, including fundamental, sub-harmonic, quasi-periodic and chaotic modes, may occur. The effects of hysteresis and its initial conditions, grading capacitors and transformer winding capacitance on occurrence of ferroresonance and its change of mode are also discussed
Clinical Characteristics and Risk Factors for Mortality of COVID-19 Patients With Diabetes in Wuhan, China: A Two-Center, Retrospective Study (2020)

OBJECTIVE Diabetes is common in COVID-19 patients and associated with unfavorable outcomes. We aimed to describe the characteristics and outcomes and to analyze the risk factors for in-hospital mortality of COVID-19 patients with diabetes. RESEARCH DESIGN AND METHODS This two-center retrospective study was performed at two tertiary hospitals in Wuhan, China. Confirmed COVID-19 patients with diabetes (N = 153) who were discharged or died from 1 January 2020 to 8 March 2020 were identified. One sex- and age-matched COVID-19 patient without diabetes was randomly selected for each patient with diabetes. Demographic, clinical, and laboratory data were abstracted. Cox proportional hazards regression analyses were performed to identify the risk factors associated with the mortality in these patients. RESULTS Of 1,561 COVID-19 patients, 153 (9.8%) had diabetes, with a median age of 64.0 (interquartile range 56.0–72.0) years. A higher proportion of intensive care unit admission (17.6% vs. 7.8%, P = 0.01) and more fatal cases (20.3% vs. 10.5%, P = 0.017) were identified in COVID-19 patients with diabetes than in the matched patients. Multivariable Cox regression analyses of these 306 patients showed that hypertension (hazard ratio [HR] 2.50, 95% CI 1.30–4.78), cardiovascular disease (HR 2.24, 95% CI 1.19–4.23), and chronic pulmonary disease (HR 2.51, 95% CI 1.07–5.90) were independently associated with in-hospital death. Diabetes (HR 1.58, 95% CI 0.84–2.99) was not statistically significantly associated with in-hospital death after adjustment. Among patients with diabetes, nonsurvivors were older (76.0 vs. 63.0 years), most were male (71.0% vs. 29.0%), and they were more likely to have underlying hypertension (83.9% vs. 50.0%) and cardiovascular disease (45.2% vs. 14.8%) (all P values &lt;0.05). Age ≥70 years (HR 2.39, 95% CI 1.03–5.56) and hypertension (HR 3.10, 95% CI 1.14–8.44) were independent risk factors for in-hospital death of patients with diabetes. CONCLUSIONS COVID-19 patients with diabetes had worse outcomes compared with the sex- and age-matched patients without diabetes. Older age and comorbid hypertension independently contributed to in-hospital death of patients with diabetes.
Functionalization of single walled carbon nanotubes (2006)

Single walled carbon nanotubes (SWNTs) exhibit unique mechanical and physical properties and immediately after their discovery they were regarded as novel materials for future technologies. SWNTs are widely thought of as one of the basic building blocks to nanotechnology. However, they are very hard to disperse and dissolve in either water or organic solvent. The insolubility of nanotubes makes it very difficult to make composites of nanotubes with other materials. This limits nanotubes from the application for future technology. A feasible functionalization of nanotubes, i.e., the attachment of "chemical functional groups" provides a strategy for overcoming these barriers and has thus attracted synthetic chemists and materials scientists to contribute their efforts to making breakthrough. Functionalization can improve solubility and processibility, and will be able to link the unique properties of nanotubes to those of other types of materials. Through the chemical functional groups, nanotube may show improved solubility and compatibility with solvents, polymers, nanoparticles and other nanotubes. A functionalized SWNT may have mechanical or electrical properties that are different from those of the pristine SWNT, and thus may be used for fine-tuning the chemistry and physical properties of SWNTs. Fluorination of side walls of the SWNTs has been performed by using the technology developed for the fluorination of graphite, and then subsequent nucleophilic substitutions have been explored. It has been ascertained that in fluorination at the optimal temperature, C:F ratios of up to 2:1 can be achieved without disruption of the tubular structure. The fluorinated SWNTs proved to be much more soluble than pristine SWNTs in alcohols, N,N-dimethylformamide and some other selected organic solvents. This improved solubility and the high fluorine addition allow much more efficient solution-phase chemistry on the fluorinated SWNTs. The goals of this work were to examine novel type of reactions that one can do with fluorinated SWNTs and study the basic aspects of functionalization of SWNTs, i.e. the mechanism of functionalization, the structure of fluorinated SWNTs, and the distribution of functional groups in the functionalized SWNTs. In this thesis, an extensive NMR study of fluorinated SWNTs has been explored (Chapter 1) and this study gives us a deeper insight to the structure of fluorinated SWNTs and the mechanism of fluorination. A series of "hydroxyl nanotube" have been simply prepared by two types of one-step methods (Chapter 2). Amino-acid functionalized nanotubes with high water solubility and sensitive pH value dependence have been achieved, and the influence of different chain length of amino acid on the water solubility was detailed (Chapter 3). The nanotube-nanoparticle heterostructures have been prepared and used to investigate the distribution of functional groups along the axis of nanotubes (Chapter 4). Finally, a novel type of reaction, Diels-Alder cycloaddition to fluorinated nanotubes was successfully performed under a mild reaction conditions (Chapter 5).
The Autonomous City Explorer: Towards Semantic Navigation in Urban Environments (2008)

... aims to create a robot capable of navigating unknown urban environments without the use of GPS data or prior map knowledge. The robot finds its way by interacting with pedestrians and building a topological representation of its surroundings. This paper outlines the necessary ingredients for successful low-level navigation on sidewalks, information retrieval from pedestrians as well as the construction of a semantic representation of an urban environment. A system architecture for outdoor localization, traversability assessment, path planning, behavior selection and topological abstraction in urban environments is presented. The efficiency of the proposed approach is verified by a number of outdoor experiments with the ACE robot.
Quantum High Secure Direct Communication with Authentication (2020)

A quantum high secure direct communication with authentication protocol is proposed by using single photons. The high security of the protocol is achieved on levels. The first level involves the verification of the quantum channel security by using fake photons. The authentication process is also ensured by the fake photons. The second level of security is given by the use of multiple polarization bases. The secret message is encoded in groups of photons; each single character of the message is associated with m (m≥7) photons. Thus, at least 2 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">7</sup> (128) characters will be encoded. In order to defeat the quantum teleportation attack, the string of bits associated to the secret message is encrypted with a secret string of bits by using XOR operator. Encryption of the sender's identity string and the receiver's identity string by the XOR operator with a random string of fake photons defends quantum man-in-the-middle attack efficiently. Quantum memory is required to implement our protocol. Storage of quantum information is a key element in quantum information processing and provides a more flexible, effective and efficient communication. Our protocol is feasible with current technologies.
Inhibition of Collagenolytic Activity and Metastasis of Tumor Cells by a Recombinant Human Tissue Inhibitor of Metalloproteinases (1990)

Metalloproteinases secreted by tumor cells play an important role in metastasis. In the present study, we determined whether an inhibitor of these proteinases could inhibit the ability of tumor cells to degrade collagen and to metastasize. Metalloproteinases with degradative activities for type I collagen, type IV collagen, gelatin, and casein were secreted by a highly metastatic rat embryo cell line (4R) transfected by c-Ha-ras1 (also known as HRAS1). These metalloproteinases were identified by sodium dodecyl sulfate substrate-polyacrylamide gel electrophoresis as 92-kilodalton and 68-kilodalton gelatinolytic enzymes and 48-kilodalton and 45-kilodalton caseinolytic proteinases. A recombinant human tissue inhibitor of metalloproteinases (rTIMP) completely inhibited the proteolytic activities of these enzymes and was also a potent inhibitor of the proteolytic degradation of collagen by intact c-Ha-ras1-transfected cells. The ability of these cells to colonize the lungs after intravenous injection into nude mice was inhibited by 83% when rTIMP was repeatedly injected intraperitoneally into the animals. These data demonstrate that rTIMP is a potent inhibitor of the metalloproteinase activities of these cells and can also inhibit their metastatic potential.
A model for the necking phenomenon in high-speed fiber spinning based on flow-induced crystallization (1998)

Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Jaydeep A. Kulkarni, Antony N. Beris; A model for the necking phenomenon in high-speed fiber spinning based on flow-induced crystallization. J. Rheol. 1 July 1998; 42 (4): 971–994. https://doi.org/10.1122/1.550913 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentThe Society of RheologyJournal of Rheology Search Advanced Search |Citation Search
Influence of Pendant Chiral C<sup>γ</sup>-(Alkylideneamino/Guanidino) Cationic Side-chains of PNA Backbone on Hybridization with Complementary DNA/RNA and Cell Permeability (2014)

Intrinsically cationic and chiral C(γ)-substituted peptide nucleic acid (PNA) analogues have been synthesized in the form of γ(S)-ethyleneamino (eam)- and γ(S)-ethyleneguanidino (egd)-PNA with two carbon spacers from the backbone. The relative stabilization (ΔTm) of duplexes from modified cationic PNAs as compared to 2-aminoethylglycyl (aeg)-PNA is better with complementary DNA (PNA:DNA) than with complementary RNA (PNA:RNA). Inherently, PNA:RNA duplexes have higher stability than PNA:DNA duplexes, and the guanidino PNAs are superior to amino PNAs. The cationic PNAs were found to be specific toward their complementary DNA target as seen from their significantly lower binding with DNA having single base mismatch. The differential binding avidity of cationic PNAs was assessed by the displacement of DNA duplex intercalated ethidium bromide and gel electrophoresis. The live cell imaging of amino/guanidino PNAs demonstrated their ability to penetrate the cell membrane in 3T3 and MCF-7 cells, and cationic PNAs were found to be accumulated in the vicinity of the nuclear membrane in the cytoplasm. Fluorescence-activated cell sorter (FACS) analysis of cell permeability showed the efficiency to be dependent upon the nature of cationic functional group, with guanidino PNAs being better than the amino PNAs in both cell lines. The results are useful to design new biofunctional cationic PNA analogues that not only bind RNA better but also show improved cell permeability.
Optical waveguiding in (In, Ga)(As, P) inverted rib waveguide lasers at 1.3 µm wavelength (1983)

A theory is presented for waveguiding in inverted rib waveguide (IRW) lasers. For the first time, theory has been compared with experiment for these structures in (In, Ga)(As, P). Consideration is given to dielectric constant models in the quaternary system. After including the large negative effect of carriers on the dielectric constant, the modified single effective oscillator model is found to be suitable. By applying the dielectric constant values so obtained to the waveguide theory, IRW design curves are produced. Measurements of lateral far-field widths and spectral separations of zero and first order modes are used to test the validity of the predictions. The agreement is very good. The guide strengths are in the range <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">\Delta \epsilon_{G} = 3-11 \times 10^{-2} (\Deltan_{G} = 5-17 \times 10^{-3})</tex> .
Preliminaries to Speech Analysis: The Distinctive Features and Their Correlates (1953)

This report proposes some questions to be discussed by specialists working on various aspects of speech communication.These questions concern the ultimate discrete components of language, their specific structure, their inven- tory in the languages of the world, their identification on the acoustical and perceptual levels and their articulatory prerequisites.We regard the present list of distinctive features, and particularly their defi- nitions on different levels, as a provisional sketch which is open to discussion and which requires experimental verification and further elaboration.The nature of these problems calls for coordinated research by linguists, psycho- logists, experts in the physiology of speech and hearing, physicists, communications and electronics engineers, mathematicians, students in symbolic logic and semiotics, and neurologists dealing with language disturbances, as well as the investigators of the poetic use of speech sounds.I
Ultrafast Switching Dynamics of Mach-Zehnder (2001)

We present results of cross-gain and cross-phase modulation experiments on InGaAsP-based semiconductor optical amplifiers and Mach-Zehnder interferometer (MZI) switches. For 150-fs input pulses, we observe strong spectral and pulse shape distortions of the signal pulse, especially in the pulse overlap regime. These pulse deteriorations are induced by subpicosecond gain and refractive index nonlinearities. In consequence, the ON-OFF ratio of the MZI switch is drastically reduced for subpi- cosecond switching windows. In the copropagation arrangement, the switching window with maximum transmission is shown to be limited to about 1.5 ps.
Innovation at work: Individual, group, organizational, and socio-historical perspectives (1996)

(1996). Innovation at work: Individual, group, organizational, and socio-historical perspectives. European Journal of Work and Organizational Psychology: Vol. 5, No. 1, pp. 3-11.
Introduction: Freedom of Speech and Employment (2002)

That freedom of speech is a fundamental human right is well established. The right to free speech or freedom of expression is protected in virtually all international and domestic human rights documents. Yet the scope of the right, and the circumstances in which it can be exercised, have yet to be fully determined. This book aims to examine the scope of the right to freedom of speech in the specific context of the workplace. The view taken throughout this book is that the right to free speech should be given greater protection in the workplace than has traditionally been the case. It holds that employees should not have work based penalties imposed upon them for exercising their right to free speech in an appropriate manner and at an appropriate time.