gebhart/patrepeval huggingface dataset:
Stable operation of induction-type bearingless motors under loaded conditions (1997)

A control method, which realizes stable operation in induction-type bearingless motors under loaded conditions, is proposed. Without a proposed control method, both the amplitude and the direction of radial force vary in accordance with loads. These variations result in interferences of radial force commands in two perpendicular axes. The interferences become a serious problem as a load increases. A shaft finally touches down without proper compensation. It is found that a decoupling of the radial force commands can be realized with compensation of both amplitude and phase angle of four-pole motor current. A decoupling controller is proposed with the principle of a field-oriented controller of conventional induction motors. The results of experiments show the validity of compensations. It is shown that induction-type bearingless motors can be operated stably under loaded conditions, as well as transient conditions.
Überführung optisch aktiver α‐Aminocarbonsäuren in optisch aktive Amine mit gleichem Kohlenstoffskelett (1951)

Abstract D (+)‐Phenylalaninol und DL ‐Phenylalaninol wurden in die beiden N‐[p‐Toluolsulfonyl]‐phenylalaninol‐p‐toluolsulfonsäureester (I) übergeführt, diese durch LiAlH 4 zu den N‐Tosylphenyl‐β‐amino‐propanen (II) reduziert und hernach durch Einwirkung von Natrium und flüssigem Ammoniak zu den Phenyl‐β‐amino‐propanen (III) aufgespalten. Das rechtsdrehende Phenyl‐β‐amino‐propan (III) entspricht in seiner Konfiguration dem D ‐(+)Phenylalanin.
Dynamic bandwidth allocation for the HFC DOCSIS MAC protocol (2002)

DOCSIS (Data Over Cable Service Interface Specifications) is the new specification for data transmission over the HFC (hybrid fiber/coax) networks. In the DOCSIS media access control (MAC) layer, the headend or CMTS (cable modem termination system) controls transmissions in the upstream direction using a centralized reservation-based approach, and is also responsible for downstream transmissions. We explore mechanisms for delivering quality of service (QoS), in the upstream and downstream directions. We propose a CMTS architecture and study the performance of the bandwidth allocation mechanisms using a model which we implemented on the OPNET Common Simulation Framework provided by CableLabs.
Verschleißschutz und Korrosionsbeständigkeit von austenitischem Stahl durch Plasmadiffusions behandlung (2000)

S.253-258
A 140-kilodalton extracellular protein is essential for the accumulation of Staphylococcus epidermidis strains on surfaces (1997)

Two distinct pathogenic mechanisms, adhesion to polymer surfaces and subsequent accumulation of sessile bacterial cells, are considered important pathogenic steps in foreign body infections caused by Staphylococcus epidermidis. By using mitomycin mutagenesis, we have recently generated a mutant, strain M7, from S. epidermidis RP62A which is unaffected in adhesion but deficient in accumulation on glass or polystyrene surfaces and lacks a 115-kDa extracellular protein (designated the 140-kDa antigen; F. Schumacher-Perdreau, C. Heilmann, G. Peters, F. Götz, and G. Pulverer, FEMS Microbiol. Lett. 117:71-78, 1994). To evaluate the role of this protein in accumulation, we harvested extracellular proteins from S. epidermidis RP62A grown on dialysis membranes placed over chemically defined medium, purified the protein by using ion-exchange chromatography, determined its N-terminal amino acid sequence, and raised antiserum in rabbits. The antibody recognized only a single band in a Western immunoblot of the crude extracellular extract. With the microtiter biofilm test, antiserum at a dilution of < or =1:1,000 blocked accumulation of RP62A up to 98% whereas preimmune serum did not. The 140-kDa antigen was found only in extracellular products from bacteria grown under sessile conditions. Of 58 coagulase-negative clinical isolates, 32 strains were 140-kDa antigen positive and produced significantly larger amounts of biofilm than the 26 strains that were 140-kDa antigen negative. The 140-kDa protein appears to be biochemically and functionally unrelated to any previously described factors associated with biofilm formation. Thus, the 140-kDa antigen, referred to as accumulation-associated protein, may be a factor essential in S. epidermidis accumulation and, due to its immunogenicity, may allow the development of novel immunotherapeutic strategies for prevention of foreign body infection.
Bone Marrow Endosteal Mesenchymal Progenitors Depend on HIF Factors for Maintenance and Regulation of Hematopoiesis (2014)

Maintenance and differentiation of hematopoietic stem cells (HSCs) is regulated through cell-autonomous and non-cell-autonomous mechanisms within specialized bone marrow microenvironments. Recent evidence demonstrates that signaling by HIF-1α contributes to cell-autonomous regulation of HSC maintenance. By investigating the role of HIF factors in bone marrow mesenchymal progenitors, we found that murine endosteal mesenchymal progenitors express high levels of HIF-1α and HIF-2α and proliferate preferentially in hypoxic conditions ex vivo. Inactivation of either HIF-1α or HIF-2α dramatically affects their phenotype, propagation, and differentiation. Also, downregulation of HIF factors provokes an increase in interferon-responsive genes and triggers expansion and differentiation of hematopoietic progenitors by a STAT1-mediated mechanism. Interestingly, in conditions of demand-driven hematopoiesis HIF factors are specifically downregulated in mesenchymal progenitors in vivo. In conclusion, our findings indicate that HIF factors also regulate hematopoiesis non-cell-autonomously by preventing activation of a latent program in mesenchymal progenitors that promotes hematopoiesis.
[Clinical aspects, pathophysiology, diagnosis and therapy of gastrointestinal manifestations of progressive systemic scleroderma]. (1996)

About 50% of patients with progressive systemic sclerosis develop significant clinical involvement of the alimentary tract. In decreasing order of frequency esophagus (75%), anorectum (50-70%), small bowel (50%), colon (40%) and stomach (40%) can exhibit characteristic morphological or functional features. Typical symptoms of reluxesophagitis and severe constipation are often reported. Beside this, diarrhea, steatorrhea and malnutrition are common complaints. Manometric and electrophysiological studies brought evidence of a neuropathy of the enteric nervous system in the early stages of the disease, resulting in disturbances of the digestive and interdigestive peristalsis and therefore e.g. leading to gastroparesis, bacterial overgrowth of the small intestine or constipation. In late PSS collagen deposition and atrophy of the smooth muscle layer of the bowel wall cause loss of function of sphincters as the lower esophageal sphincter or the anal sphincter and marked atony of parts of the intestine. The diagnostic procedures consist of esophageal manometry, 24-h pH-metry, esophageal and gastric radionuclide transit studies, H2-breath tests, barium enemas, anorectal manometry and endoscopy. Therapeutic options include H2-antagonists, proton-pump inhibitors, prokinetic drugs, octreotides and antibiotics. Nutritional supplementation and surgical interventions are often of limited therapeutic value. Finally in some cases long-term total parenteral nutrition is warranted.
04 - Apport de l'espace Teinte-Saturation-Luminance pour la segmentation spatiale et temporelle (2006)

In this article, we focus on the Hue Saturation Luminance colour space, known for its appropriate representation of the\nhuman vision, and we illustrate its interest in the segmentation of image data, both in the spatial and temporal\ndimensions. The HSL space, with its particular properties (one angular component, the hue, and two scalar components,\nthe saturation and the luminance), requires some original computation models. So our contribution is triple : first we will\ndeal with colour representation in the HSL space and with specific computation methods which have to be involved.\nThen we will show the relevance of this colour space for automatic segmentation of image data in the two domains\nwhich are space and time. Spatial segmentation is considered under the problem of background and foreground\nseparation for which we propose a multiresolution approach which requires a single image. Temporal segmentation\ncorresponds to shot change detection in an image sequence, and the method we are proposing is based on the use of context-independent distance measures. Common properties of our both methods (spatial and temporal segmentations)\nare efficiency (processing time compatible with video framerate) and robustness (in particular against illumination\nchanges). We illustrate these two approaches with results obtained in the domain of sport video sequences analysis and\nwe compare in this context the use of HSL and RGB colour spaces.
Thermal conductivity of binary, ternary, and quaternary III-V compounds (1988)

The room-temperature thermal conductivity of III-V compounds is analyzed. The phenomenological approach of Abeles is applied to take into account disordered structure of ternary and quaternary alloys. The procedure is used for the In1−xGaxAsyP1−y quaternary alloy. The approximate analytical expression for this case is derived. A more exact method of the calculations is also proposed. It enables presenting the thermal conductivity and the thermal diffusivity for both the InP lattice-matched and GaAs lattice-matched In1−xGaxAsyP1−y alloys as a function of their composition.
A Secure Communication Protocol for Drones and Smart Objects (2015)

In many envisioned drone-based applications, drones will communicate with many different smart objects, such as sensors and embedded devices. Securing such communications requires an effective and efficient encryption key establishment protocol. However, the design of such a protocol must take into account constrained resources of smart objects and the mobility of drones. In this paper, a secure communication protocol between drones and smart objects is presented. To support the required security functions, such as authenticated key agreement, non-repudiation, and user revocation, we propose an efficient Certificateless Signcryption Tag Key Encapsulation Mechanism (eCLSC-TKEM). eCLSC-TKEM reduces the time required to establish a shared key between a drone and a smart object by minimizing the computational overhead at the smart object. Also, our protocol improves drone's efficiency by utilizing dual channels which allows many smart objects to concurrently execute eCLSC-TKEM. We evaluate our protocol on commercially available devices, namely AR.Drone2.0 and TelosB, by using a parking management testbed. Our experimental results show that our protocol is much more efficient than other protocols.
Structure and stability of concentrated boehmite sols (1978)

The viscoelastic properties of dispersions of microcrystalline boehmite (AlOOH) particles, covering a range of high concentrations (>10% w/w) and containing different electrolytes, have been measured under oscillatory shear with a Weissenberg rheogoniometer. Stable dispersions were highly elastic and often thixotropic—properties which are ascribed to short range (<10 nm) interparticle repulsion forces. When destabilised by addition of certain counterions (IO3–, BrO3–, F–, SO42–) this elasticity was lost and plastic properties developed. Interparticle repulsion is attributed to extensively solvated polynuclear aluminium cations, formed at the boehmite surface during acid peptisation, whose presence was consistent with quasielastic neutron scattering and other evidence.Light scattering measurements on dilute dispersions (<2% w/w) showed that the latter contain large and very open aggregates of primary sol particles–the number of primary particles per aggregate being dependent on the electrolyte concentration. In more concentrated dispersions (with volume fractions, φ > 0.1) a stable and coherent structure analogous to the individual aggregates is proposed.
Distribution of Novel and Well-Known Poly- and Perfluoroalkyl Substances (PFASs) in Human Serum, Plasma, and Whole Blood (2017)

Currently, there is limited knowledge on the distribution of poly- and perfluoroalkyl substances (PFASs) in different blood matrices, particularly for novel PFASs such as polyfluoroalkyl phosphate esters (PAPs) and perfluoroalkyl phosphonates (PFPAs). To explore this, serum, plasma, and whole blood from 61 adults in Oslo, Norway were collected. The largest number of PFASs were detected in whole blood. For PAPs and PFPAs, the highest frequencies of detection and concentrations were observed in plasma. PAPs contributed to 8% of total PFASs in plasma (median, 0.81 ng mL<sup>-1</sup>). Perfluorohexylphosphonate (PFHxPA) was the dominant PFPA, regardless of blood matrix. The relative composition profiles of PFASs in blood matrices differed. For some specific PFASs such as perfluorooctanesulfonamide (PFOSA) and perfluorohexanoate (PFHxA), the highest concentrations were observed in whole blood. The PFAS concentration ratios varied between blood matrices, depending on the compounds. However, similar ratios were observed for 6:2 polyfluoroalkyl phosphate diester (6:2diPAP) as well as well-known PFASs such as perfluorooctanesulfonate (PFOS) and perfluorooctanoate (PFOA). Besides the determination of 25 PFASs in human blood, this study also lead to better understanding of biomonitoring data from different blood matrices, which is key knowledge for performing both exposure assessments and epidemiological studies.
Pervasive computing: a paradigm for the 21st century (2003)

Pervasive computing promises to make life simpler via digital environments that sense, adapt, and respond to human needs. Yet we still view computers as machines that run programs in a virtual environment. Pervasive computing presumes a different vision. A device can be a portal into an application-data space, not just a repository of custom software a user must manage. An application is a means by which a user performs a task, not software written to exploit a device's capabilities. And a computing environment is an information-enhanced physical space, not a virtual environment that exists to store and run software. Pervasive computing is close to technical and economic viability.
Studies of RF shimming techniques with minimization of RF power deposition and their associated temperature changes (2011)

In ultrahigh field (UHF), human magnetic resonance imaging (MRI) concerns related to the homogeneity of the B1+ field [the radiofrequency (RF) magnetic field component responsible for the excitation of the spins] and the local/average specific absorption rate (SAR) are highly evident. In this work, through RF shimming techniques, a full-wave electromagnetic model that treats a coupled-RF coil and the load (an 18-tissue anatomically detailed human head model) as a single system is utilized to simultaneously (1) improve the homogeneity of B1+ field in various regions of interest across the volume of the human head and (2) minimize the total RF power deposition at 7 and 9.4 T. The numerical results illustrate that the B1+ field homogeneity (evaluated by the coefficient of variance) can be greatly improved in 3D slabs that vary in orientations and sizes, in the brain, and in the entire head volume without increasing the total RF power deposition in the head to exceed that obtained with quadrature excitation. The RF shimming simulation results are experimentally validated (by performing RF shimming without experimental B(1) measurements) on a head-sized phantom using a 7-T human MRI scanner equipped with a transmit array excitation system. The SAR and associated temperature changes under quadrature and RF shimming excitation conditions are calculated and compared.
Rapid growth of evanescent wave by a silver superlens (2003)

Recent theoretical work suggested the possibility of constructing a super-resolution diffraction-free lens by using a negative refractive index medium (NRIM). The key proposition is that evanescent waves can be greatly enhanced by increasing the thickness of the NRIM. We report here experimental evidence that confirms that the transmission of evanescent waves rapidly grows with the film thickness up to about 50 nm, after which it decays as loss becomes significant. These findings represent the first step toward the understanding and realization of a diffraction-free lens.
New Group IV Metallocene Systems Active in the Copolymerization of <i>α</i>‐Olefins and Conjugated Dienes (2006)

Abstract Summary: Rac ‐[CH 2 (2,4‐di‐ tert ‐butyl‐cyclopentadienyl) 2 ]ZrCl 2 ( 1 ), rac ‐[CH 2 (3‐ tert ‐butyl‐4,5,6,7‐tetrahydroindenyl) 2 ]ZrCl 2 ( 2 ), rac ‐[CH 2 (3‐isopropyl‐4,5,6,7‐tetrahydroindenyl) 2 ]ZrCl 2 ( 3 ), and rac ‐[CH 2 (3‐methyl‐4,5,6,7‐tetrahydroindenyl) 2 ]ZrCl 2 ( 4 ) were synthesized and characterized by 1 H NMR analysis. These C 2 symmetric ansa ‐zirconocenes, activated with methylaluminoxane (MAO), were able to promote copolymerization of ethene and 1,3‐butadiene. The structures of the copolymers are strongly influenced by zirconocene utilized as catalytic precursor. Depending on the reaction conditions polyethenes containing cyclopropane and cyclopentane rings, or 1,1‐ 1,3‐butadiene inserted constitutional units, were obtained. Structures of the synthesized catalytic precursors. magnified image Structures of the synthesized catalytic precursors.
NEWSCRIPTS (1996)

RETURN TO ISSUEPREVNewsNEXTNEWSCRIPTSMysterious device turns out to be vortex tubeK. M. REESECite this: Chem. Eng. News 1996, 74, 14, 56Publication Date (Print):April 1, 1996Publication History Published online12 November 2010Published inissue 1 April 1996https://pubs.acs.org/doi/10.1021/cen-v074n014.p056https://doi.org/10.1021/cen-v074n014.p056newsACS PublicationsCopyright © 1996 American Chemical SocietyArticle Views7Altmetric-Citations-LEARN 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 SUBJECTS:Thermodynamics Get e-Alerts
Structure–activity relationships of benzimidazole derivatives as antiparasitic agents: Dual activity-difference (DAD) maps (2010)

Parasitic infections still remain a major health threat in developing countries. Herein we report a systematic characterization of the structure–activity relationships (SAR) of a comprehensive set of benzimidazole derivatives tested against Trichomonas vaginalis and Giardia intestinalis. The analysis was based on pairwise comparisons of the activity similarity and molecular similarity using different molecular representations. Overall, results encourage simultaneous lead optimization efforts for benzimidazole derivatives active against both protozoan. In order to explore the activity profile of the benzimidazoles against the two parasites, we developed the dual activity-difference (DAD) map. DAD map is a complementary approach to systematically characterize the SAR of compound data sets.
Visual Arrestin Binding to Rhodopsin (1995)

Arrestin plays a critical role in quenching phototransduction via its ability to specifically interact with the phosphorylated light-activated form of the visual receptor rhodopsin. In an effort to identify the residues involved in interaction with the phosphorylated C terminus of rhodopsin, we introduced point mutations into a basic region in visual arrestin previously implicated in phosphorylation-recognition (residues 163-189). A total of nine point mutations were made, each substituting a neutral hydrophilic residue for a positively charged Lys, Arg, or His. The functional consequences of these mutations were then analyzed by comparing the binding of full-length and truncated wild-type and mutant arrestin to various functional forms of rhodopsin. These studies demonstrate that Arg-171, Arg-175, and Lys-176 in bovine arrestin play a primary role in phosphate interaction, while Lys-166 and Lys-167 likely play a minor role in phosphate binding. In contrast, Lys-163 and His-179 appear to play a regulatory role, while Arg-182 and Arg-189 are not directly involved in arrestin binding to rhodopsin. Arg-175 also appears to function as a phosphorylation-sensitive trigger since charge neutralization by mutagenesis enables arrestin-R175N to bind to light-activated rhodopsin as well as wild-type arrestin binds to phosphorylated light-activated rhodopsin. The implications of these findings for the sequential multisite binding of arrestin to rhodopsin are discussed.
Peroxiredoxin distribution in the mouse brain with emphasis on neuronal populations affected in neurodegenerative disorders (2011)

Redox changes are observed in neurodegenerative diseases, ranging from increased levels of reactive oxygen/nitrogen species and disturbance of antioxidant systems, to nitro-oxidative damage. By reducing hydrogen peroxide, peroxynitrite, and organic hydroperoxides, peroxiredoxins (Prdxs) represent a major potential protective barrier against nitro-oxidative insults in the brain. While recent works have investigated the putative role of Prdxs in neurodegenerative disorders, less is known about their expression in the healthy brain. Here we used immunohistochemistry to map basal expression of Prdxs throughout C57BL/6 mouse brain. We first confirmed the neuronal localization of Prdx2-5 and the glial expression of Prdx1, Prdx4, and Prdx6. Then we performed an in-depth analysis of neuronal Prdx distribution in the brain. Our results show that Prdx2-5 are widely detected in the different neuronal populations, and especially well expressed in the olfactory bulb, in the cerebral cortex, in pons nuclei, in the red nucleus, in all cranial nerve nuclei, in the cerebellum, and in motor neurons of the spinal cord. In contrast, Prdx expression is very low in the dopaminergic neurons of substantia nigra pars compacta and in the CA1/2 pyramidal cells of hippocampus. This low basal expression may contribute to the vulnerability of these neurons to nitro-oxidative attacks occurring in Parkinson's disease and Alzheimer's disease. In addition, we found that Prdx expression levels are unevenly distributed among neurons of a determined region and that distinct regional patterns of expression are observed between isoforms, reinforcing the hypothesis of the nonredundant function of Prdxs.