gebhart/patrepeval huggingface dataset:
Space vector PWM control of a split-phase induction machine using the vector classification technique (2002)

A new and effective space vector PWM control of six-phase voltage source inverters fed split-phase induction motors is presented in this paper. The proposed approach is based on three-phase space vector modulation (SVM) techniques, thereby, it inherently eliminates the 5th, 7th, 17th, 19th, ...harmonic currents without extensive computations. Furthermore, the paper utilizes a classification algorithm for the implementation of the SVM which improves the simplicity, accuracy, and the construction execution speed. A comparison is made between the results obtained from the proposed approach, and those from the conventional space vector modulation and the space vector modulation based on a vector decomposition technique. Both feedforward (V/f control), and feedback (vector control) schemes are addressed. Simulation results provided verify the validity of the proposed scheme.
Performance modeling of the IDES framework (1997)

The IDES project at Sandia National Laboratories is developing a large scale portable parallel simulator for use in stockpile stewardship. IDES will use the Breathing-Time-Buckets synchronization protocol; to support IDES development, this paper studies a performance model and describes performance experiments on expected work load and architectural parameters. A new parallel algorithm for terminating the window quickly is also described and analyzed.
Synthesis and Functionalization of <i>m</i><i>eso</i>-Aryl-Substituted Corroles (2000)

The Rothemund condensation reaction of pyrrole and aldehydes is an extensively used route to meso-tetraarylporphyrins, but simple modifications of the reaction conditions allow the formation of different macrocycles other than the expected porphyrin. In the presence of an excess of pyrrole, this modified Rothemund approach leads to the synthesis of meso-triary-substituted corroles. This methodology allows the preparation of a wide range of substituted corroles starting from commercially available products. Higher yields have been obtained in the case of benzaldehydes bearing electron-withdrawing substituents, while the reaction fails in the presence of 2,6-disubstituted benzaldehydes. Although if not isolated, some experimental evidences indicate that the linear 5,10,15-triphenylbilane 4 is the precursor of the final corrole ring. Reaction of 5,10,15-triphenylcorrole 2 with an excess of NBS leads to the complete bromination of the macrocycle. Spectroscopic characterization seems to indicate the formation of the porphodimethene-like structure 5, where the macrocyclic aromatic conjugation is interrupted at the 10 position. Metalation of this compound with cobalt acetate and PPh3 affords the corresponding complex. The X-ray crystal structure of triphenylphosphine [2,3,7,8,12,13,17,18-octabromo-5,10,15-tris(4-nitrophenyl)corrolato]- cobalt(III) 8 confirms the ability of corrole ring to retain an almost planar conformation when fully substituted at the peripheral position.
Ar/HMDSO/O<sub>2</sub> Fed Atmospheric Pressure DBDs: Thin Film Deposition and GC‐MS Investigation of By‐Products (2010)

Abstract The thin film deposition in DBDs fed with Ar/HMDSO/O 2 mixtures was studied by comparing the FT‐IR spectra of the deposits with the GC‐MS analyses of the exhaust gas. Under the experimental conditions investigated, oxygen addition does not enhance the activation of the monomer while it highly influences the chemical composition and structure of the deposited coating as well as the quali‐quantitative distribution of by‐products in the exhaust. Without oxygen addition a coating with high monomer structure retention is obtained and the exhaust contains several by‐products such as silanes, silanols, and linear and cyclic siloxanes. The dimethylsiloxane unit seems to be the most important building block of oligomers. Oxygen addition to the feed is responsible for an intense reduction of the organic character of the coating as well as for a steep decrease, below the quantification limit, of the concentration of all by‐products except silanols. Some evidences induce to claim that the silanol groups contained in the deposits are formed through heterogeneous (plasma‐surface) reactions. magnified image
Experimental study on noise characteristics of a gain-saturated fiber optical parametric amplifier (2002)

A fiber optical parametric amplifier (OPA) has a unique saturation property such that, with increase in signal input, the signal output power increases, reaches a peak level, then decreases. Around the output peak condition, a negative feedback mechanism works to suppress intensity fluctuations in the signal output. This paper experimentally studies noise characteristics of such a gain-saturated fiber OPA. Two kinds of incident signals are injected into a fiber OPA. One is intentionally fluctuated light with large excess noise and the other is excess-noise-free (or shot-noise-limited) light. It is demonstrated that the noise suppression has an effect both on the excess noise and on beat noise due to amplified spontaneous emission generated inside the amplifier.
The ExsA Protein of <i>Bacillus cereus</i> Is Required for Assembly of Coat and Exosporium onto the Spore Surface (2005)

The outermost layer of spores of the Bacillus cereus family is a loose structure known as the exosporium. Spores of a library of Tn917-LTV1 transposon insertion mutants of B. cereus ATCC 10876 were partitioned into hexadecane; a less hydrophobic mutant that was isolated contained an insertion in the exsA promoter region. ExsA is the equivalent of SafA (YrbA) of Bacillus subtilis, which is also implicated in spore coat assembly; the gene organizations around both are identical, and both proteins contain a very conserved N-terminal cortex-binding domain of ca. 50 residues, although the rest of the sequence is much less conserved. In particular, unlike SafA, the ExsA protein contains multiple tandem oligopeptide repeats and is therefore likely to have an extended structure. The exsA gene is expressed in the mother cell during sporulation. Spores of an exsA mutant are extremely permeable to lysozyme and are blocked in late stages of germination, which require coat-associated functions. Two mutants expressing differently truncated versions of ExsA were constructed, and they showed the same gross defects in the attachment of exosporium and spore coat layers. The protein profile of the residual exosporium harvested from spores of the three mutants--two expressing truncated proteins and the mutant with the original transposon insertion in the promoter region--showed some differences from the wild type and from each other, but the major exosporium glycoproteins were retained. The exsA gene is extremely important for the normal assembly and anchoring of both the spore coat and exosporium layers in spores of B. cereus.
Evaluation of a tape-stripping technique for measuring dermal exposure to pyrene and benzo(a)pyrene (2011)

Epidemiological studies have shown an increased incidence of cancer among workers occupationally exposed to polycyclic aromatic hydrocarbons (PAHs). As the dermal route is considered important for exposure to PAHs in the workplace, the aim of this study was to develop and evaluate a tape-stripping technique for monitoring dermal exposure to pyrene and benzo(a)pyrene. The tape-stripping method was evaluated by applying different concentrations of pyrene and benzo(a)pyrene directly onto tape strips (spiked tapes), clean glass plates, and on the skin of five volunteers. The glass plates were stripped using a single strip of tape and the skin of the volunteers was stripped with five consecutive strips of tape after 0 and 30 minutes. The method was also tested on five chimney sweeps at three exposure sites. High-performance liquid chromatography with fluorescence detection was employed for the quantification of pyrene and benzo(a)pyrene. The mean recovery from the spiked tapes was 97% for pyrene and 93% for benzo(a)pyrene. The mean overall recovery from the glass plates was 88% and 76% for pyrene and 88 and 85% for benzo(a)pyrene. The recovery from human skin was 70% and 63% for pyrene and 60 and 54% for benzo(a)pyrene, after 0 and 30 minutes, respectively. A concentration gradient was clearly detected between the five consecutive strips. Detectable amounts of pyrene and benzo(a)pyrene were found on all chimney sweeps at all exposure sites. This method can thus be used to detect and quantify dermal exposure to pyrene and benzo(a)pyrene. The results also show that pyrene and benzo(a)pyrene may be taken up by the skin.
Quinoline, quinazoline, and acridone alkaloids (1994)

J. P. Michael, Nat. Prod. Rep., 1994, 11, 163 DOI: 10.1039/NP9941100163
Role of AKT1 in 17β-estradiol- and insulin-like growth factor I (IGF-I)-dependent proliferation and prevention of apoptosis in MCF-7 breast carcinoma cells (1999)

AKT1 (c-AKT, PKBalpha) is the cellular homolog of the protein-serine/threonine kinase oncogene, v-akt. AKT1 is activated through the insulin and platelet-derived growth factor signaling pathways in transfected fibroblasts, but little is known about the regulation of endogenous AKT1 in tumor cells. AKT1 levels were higher in a panel of human breast carcinoma cell lines than in breast epithelial cells, particularly those with higher HER2 expression. AKT1 activity was increased by either estradiol or IGF-I in estrogen-dependent MCF-7 cells, and both factors acted synergistically to increase AKT1 activity and promote cell proliferation. Stimulation of AKT1 activity by estradiol and IGF-I was blocked by the antiestrogen ICI 182780 and by the phosphatidylinositol-3-kinase inhibitor wortmannin. MCF-7 cells transfected with AKT1 exhibited partial estrogen- and IGF-I-independent growth and were more responsive to the combination of IGF-I and estradiol. AKT1-overexpressing MCF-7 cells were less sensitive to apoptosis induced by wortmannin. These findings suggest that AKT1 is a downstream effector of estrogen- and IGF-I-dependent proliferation and survival in hormone-responsive MCF-7 breast carcinoma cells.
Identification and Functional Characterization of a Novel Mitochondrial Carrier for Citrate and Oxoglutarate in Saccharomyces cerevisiae (2010)

Mitochondrial carriers are a family of transport proteins that shuttle metabolites, nucleotides, and coenzymes across the mitochondrial membrane. The function of only a few of the 35 Saccharomyces cerevisiae mitochondrial carriers still remains to be uncovered. In this study, we have functionally defined and characterized the S. cerevisiae mitochondrial carrier Yhm2p. The YHM2 gene was overexpressed in S. cerevisiae, and its product was purified and reconstituted into liposomes. Its transport properties, kinetic parameters, and targeting to mitochondria show that Yhm2p is a mitochondrial transporter for citrate and oxoglutarate. Reconstituted Yhm2p also transported oxaloacetate, succinate, and fumarate to a lesser extent, but virtually not malate and isocitrate. Yhm2p catalyzed only a counter-exchange transport that was saturable and inhibited by sulfhydryl-blocking reagents but not by 1,2,3-benzenetricarboxylate (a powerful inhibitor of the citrate/malate carrier). The physiological role of Yhm2p is to increase the NADPH reducing power in the cytosol (required for biosynthetic and antioxidant reactions) and probably to act as a key component of the citrate-oxoglutarate NADPH redox shuttle between mitochondria and cytosol. This protein function is based on observations documenting a decrease in the NADPH/NADP(+) and GSH/GSSG ratios in the cytosol of DeltaYHM2 cells as well as an increase in the NADPH/NADP(+) ratio in their mitochondria compared with wild-type cells. Our proposal is also supported by the growth defect displayed by the DeltaYHM2 strain and more so by the DeltaYHM2DeltaZWF1 strain upon H(2)O(2) exposure, implying that Yhm2p has an antioxidant function.
Grafting of poly (methyl acrylate) onto sulfite pulp fibers and its effect on water absorbance (2007)

Abstract To prepare super water absorbent hydrogels of wood cellulose fibers, poly (methyl acrylate) (PMA) was copolymerized onto softwood sulfite pulp fibers using free radical initiator followed by alkaline hydrolysis. Ceric ammonium nitrate (CAN) was used as the free radical initiator. Effects of various parameters such as fiber concentration, monomer/pulp (M/pulp) ratio, CAN concentration, and reaction time on the grafting yield and on other grafting parameters were investigated. The graft conversion was the same from low to medium fiber concentration. The amount of initiator required was found to be independent of fiber concentration to achieve maximum grafting yield. Different fiber fractions (classified based on their length) have no effect on the grafting yield. The evidence of graft copolymerization was determined by using ATR‐IR spectroscopy. The X‐ray diffraction (XRD) analysis shows that grafting takes place both in amorphous and crystalline regions of cellulose fibers and the decrease in crystallinity of the grafted fibers with an increase in grafting yield was confirmed. The surface morphology of the PMA‐g‐cellulose was characterized by scanning electron microscopy (SEM). The water retention value of the hydrolyzed grafted pulp was determined based on a centrifugation technique. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007
Photon-counting spectral computed tomography using silicon strip detectors: a feasibility study (2010)

We show how the spectral imaging framework should be modified to account for a high fraction of Compton interactions in low Z detector materials such as silicon. Using this framework, where deposited energies differ from actual photon energies, we compare the performance of a silicon strip detector, including the influence of scatter inside the detector and charge sharing but disregarding signal pileup, with an ideal energy integrating detector. We show that although the detection efficiency for silicon rapidly drops for the acceleration voltages encountered in clinical computed tomography practice, silicon detectors could perform on a par with ideal energy integrating detectors for routine imaging tasks. The use of spectrally sensitive detectors opens up the possibility for decomposition techniques such as k-edge imaging, and we show that the proposed modification of the spectral imaging framework is beneficial for such imaging tasks.
Calcium regulation in tissue-cultured human and bovine lens epithelial cells. (1993)

Lens cytoplasmic calcium is controlled by calcium adenosine triphosphatases at the plasma and endoplasmic reticulum membranes. The former is inhibited by W7 and insensitive to thapsigargin whereas the latter is inhibited by thapsigargin, but insensitive to W7. The lens endoplasmic reticulum store is also controlled by an inositol (1,4,5) trisphosphate calcium-release mechanism. Na+/Ca2+ exchange plays a relatively minor role in calcium regulation, at least at resting calcium levels.
Weak scattering in random media, with applications to remote probing (1969)

A simple phase-screen technique has been used to derive statistical characterizations of the perturbations imposed upon a wave (plane, spherical, or beamed) propagating through a random medium. The method is essentially physical rather than mathematical; its application is limited only by the weak-scattering approximation, a limitation which is important only for long optical or acoustical paths. No other wavelength restriction is imposed. Situations treated include arbitrary path geometries, finite transmitting and receiving apertures, anisotropic or lossy media, and polarization effects. Results include, in addition to the usual statistical quantities, time-lagged functions, mixed functions involving phase and amplitude fluctuations, angle-of-arrival covariances, frequency covariance, and other higher order quantities.
Development of a Parametric Form Generation Procedure for Customer-Oriented Product Design (2013)

Currently, the involvement of consumer requirements in the early stage of product development has become an important issue in product design. The designer needs to correctly and immediately do customer requirement analysis and make decisions in the process of design alternative recommendation. However, the designer is usually difficult to grasp customer requirements. Fortunately, the enforcement of computer software and upgraded efficacy of computer hardware allow an embodiment representation of design alternatives to link customers with designers. Therefore, the objective of this research is to develop a parametric product design system that can provide designers with an interactive interface to consider customer requirements in the early stage of product development. The design of ear phones is used as a case to explore the applicability of the parametric product design system. The function of parametric design in the CATIA software is also used to help construct design appearance for the generated ear phones.
1,25-Dihydroxyvitamin D3 as a natural regulator of human immune functions. (1996)

1,25-dihydroxyvitamin D3 (1,25-D3) modulates lymphocyte and macrophage functions in vitro. These effects are exerted through production of 1,25-D3 by antigen-presenting monocytes/macrophages (MO) and binding to vitamin D receptors expressed in MO and in activated, but not in resting T-lymphocytes. 1,25-D3 inhibits production of MO-derived cytokines such as interleukin-1 alpha, interleukin-6, and tumor necrosis factor alpha at the post-transcriptional level, most likely by reducing the half-life of specific mRNAs. The proliferation of T-cells and their release of cytokines such as IL-2 and interferon gamma are also suppressed by 1,25-D3, partly as a result of the reduced production of T-cell-activating cytokines (interleukin-1 alpha, tumor necrosis factor alpha), but also because of a direct effect on the T-cells. Although 1,25-D3 has no apparent effect on B-lymphocytes, the T-cell suppression indirectly inhibits antibody production by B-cells. The CD45R0+ subset of T-helper cells is relatively more sensitive than the CD45RA+ subset to the inhibitory effects of 1,25-D3. The CD45R0+ subset plays a key role in immune activation and in the pathogenesis of many autoimmune disease. 1,25-D3 acts as an important local regulator of T-cell functions and thus modulates several immunological effector functions. The actions of 1,25-D3 are distinct from those of commonly used immunosuppressants, and vitamin D3 analogs are therefore potentially useful as alternatives to conventional immunosuppressive therapies.
Multifunctional flexible PVDF-TrFE/BaTiO<inf>3</inf> based tactile sensor for touch and temperature monitoring (2017)

This paper presents an enhanced piezoelectricity based sensor for touch and temperature sensing. The sensor is realized over flexible polyimide film, making it suitable for application like e-skin. The sensing material is composed of Polyvinylidene Fluoride-Trifluoroethylene (PVDF-TrFE) and Barium Titanate (BaTiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> ) nanoparticles. While, the piezoelectric polymer PVDF-TrFE ensures the flexibility of sensor, BaTiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> imparts high sensitivity to touch and temperature. The sensor is tested over temperature range which is common in daily life and the sensitivity to touch is characterized by tapping mode using fixed load. The results confirms the advantage of using poly-ceramic composite over piezoelectric polymer.
An artificial intelligence system for power system contingency screening (1988)

The power system security assessment problem is considered. The objective is to investigate the extent to which a computer program with knowledge and inference capabilities can assist a human operator in this task. A rule-based system for screening the consequences of single outages was developed which can be extended to deal with multiple outages. The rules are independent of the size of the power system and derive partly from human operator expertise and partly from simulation models. Results show that such systems can be very effective in focusing attention on a much-reduced number of the more critical contingencies. The expert system was demonstrated using a power system model of moderate size (25 buses, 35 lines). This approach is cost effective and can be applied to online operation.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
Polypropylene-graft-Polycaprolactone: Synthesis and Applications in Polymer Blends (1994)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolypropylene-graft-Polycaprolactone: Synthesis and Applications in Polymer BlendsT. C. Chung and D. RhubrightCite this: Macromolecules 1994, 27, 6, 1313–1319Publication Date (Print):March 1, 1994Publication History Published online1 May 2002Published inissue 1 March 1994https://pubs.acs.org/doi/10.1021/ma00084a005https://doi.org/10.1021/ma00084a005research-articleACS PublicationsRequest reuse permissionsArticle Views1028Altmetric-Citations74LEARN 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
Aerodynamics for Naval Aviators (1965)

This series of textbooks and supplements for pilots, student pilots, aviation instructors, and aviation specialists provides information on every topic needed to qualify for and excel in the field of aviation. Most FAA Knowledge Exams' questions are taken directly from the information presented in these texts. This textbook presents the elements of applied aerodynamics and aeronautical engineering that directly relate to the flight training and general flight operations of naval aviators.
Highly Selective Oligosaccharide Sensing by a Curdlan−Polythiophene Hybrid (2010)

An in situ hybrid complex of Curdlan with water-soluble polythiophene functioned as a highly sensitive and selective saccharide chemosensor in aqueous media, enabling us to discriminate tetrasaccharide acarbose at 1 μM from 24 mono-, di-, tri-, tetra-, and pentasaccharides.
Nanometer-Sized Phase-Change Recording Using a Scanning Near-Field Optical Microscope with a Laser Diode (1996)

We present for the first time a nanometer-sized phase-change recording using a scanning near-field optical microscope (PC-SNOM recording). The recording experiments were performed with a SNOM using a 785-nm-wavelength semiconductor laser diode, shear force detection for gap control and reflected light detection for observing the domains (reading). The recording media of ZnS·SiO 2 (20 nm)/GeSbTe(30 nm)/ZnS·SiO 2 (150 nm)/polycarbonate substrate were used. The writings were done at laser powers of 8.4–7.3 mW in the probe for pulse widths of 5 or 0.5 ms. As a result, we obtained a minimum recorded domain size of 60 nm in diameter. This size shows a potential to achieve an ultrahigh density PC-SNOM recording with about 170 Gb/in 2 . A possibility of achieving high speed readout for the future data storage is also discussed.