gebhart/patrepeval huggingface dataset:
Novel multimodal high-speed structures using substrate integrated waveguides with shielding walls in thin film technology (2008)

The viability of multimode high-speed transmission structures in 3D silicon system-in-package modules is examined with full-wave simulations. Multimode transmission is achieved by integrating a stripline into a dielectric filled waveguide built over a silicon substrate shielded with walls instead of the via fence used in the traditional substrate integrated waveguide (SIW) structure. Isolation and transmission properties are evaluated using the full-wave solver Ansoft HFSS. The improvement of shielding walls eliminates potential bandgaps, offers a more predictable response, and reduces attenuation at high frequencies by 10% on the TEM mode.
Structure and properties of tempo-oxidized cotton fibers (2012)

In this paper, the influence of the catalytic oxidation using water soluble and stable nitroxyl radical 2,2?,6,6?-tetramethylpiperidine-1-oxyl (TEMPO) on structure and properties of cotton fibers was studied. In particular, the selective TEMPO-mediated oxidation has become very interesting way for introduction of functional groups into cellulose fibers with the aim to obtain oxycellulose fibers with specific properties. Unmodified and modified fibers were characterized in terms of weight loss values, introduced functional groups and crystallinity index. Also, oxidized fibers were characterized in terms of the sorption, morphological, and physico-mechanical properties. The TEMPO-oxidized cotton fibers show a minimum increase of fineness (from 1.32 to 1.28 dtex) and increase of crystallinity index (up to 91.9%), while the tensile strength of fibers decreases (up to 10.82 cN/tex). By the TEMPO-mediated oxidation of cotton fibers significant amount of carboxyl groups (up to 0.795 mmol/g cell) can be introduced into cellulose fibers. Introduced hydrophilic carboxyl groups increases the sorption properties of oxidized fibers, that can be used directly or for further chemical modification.
Down-modulation of epidermal growth factor receptor affinity in fibroblasts treated with interleukin 1 or tumor necrosis factor is associated with phosphorylation at a site other than threonine 654. (1990)

Interleukin 1 or tumor necrosis factor alpha can cause a transient down-modulation of epidermal growth factor (EGF) binding to quiescent fibroblast monolayers; the effect results from a reduction in EGF receptor (EGF-R) affinity and appears to be mediated by a protein kinase C (PKC)-independent mechanism. Here we show transient increases in EGF-R serine/threonine phosphorylation which are temporally coordinated with the effects on EGF binding; we also demonstrate that the cytokine-mediated phosphorylations, unlike those caused by PKC activators, have little discernible effect upon intrinsic EGF-R-associated tyrosine kinase activity. Cytokine-mediated EGF-R phosphorylation is resistant to staurosporine, an extremely potent inhibitor of PKC. Analysis of tryptic 32P-phosphopeptides reveals that Thr654, the unique site of PKC-mediated phosphorylation, is not phosphorylated in cytokine-treated cells, but a different, relatively acidic, peptide containing phosphoserine can be detected instead.
Photoelectrochemistry in particulate systems. 5. Visible light‐induced polymerization of 1‐vinylpyrene in semiconductor suspensions (1987)

Abstract Photoelectrochemical polymerization of 1‐vinylpyrene has been achieved in a semiconductor photocatalyst suspension under visible light irradiation (λ > 480 nm). Bandgap excitation of CdS, CdSe or Fe 2 O 3 led to the oxidation of 1‐vinylpyrene, which initiated the polymerization process. A 25–47% yield of poly(1‐vinylpyrene) could be obtained upon irradiation of these semiconductor photocatalyst suspensions with 1‐vinylpyrene in acetonitrile. Dependence of the polymer yield on various experimental conditions is described.
Design, Fabrication, And Testing Of A C-shape Actuator (2005)

SUMMARY This paper describes the design, fabrication, and testing of a microactuator, whose bimorph beams curl up to form a C-shape and reach hundreds of microns from the substrate. The multi-layer C-shape beams were designed by FEM nonlinear analysis and fabricated on a silicon wafer by surface micromachining involving polyimide and metal thin films. The large curvature (i.e., small radius of curvature) is achieved by utilizing the large residual stress difference between thin films. The device is normally curled up, and it opens up by either electrostatic or thermal actuation. The device was operated successfully in liquid as well as in air to their full range between complete curl up and flat positions, demonstrating tip displacements of over two hundred microns.
Ammonia Sensing Mechanism of Tungstated-Zirconia Thick Film Sensor (2007)

A sensor element of interdigital capacitor (IDC) electrodes covering with tungstated-zirconia thick film shows a good response and cross-sensitivity in gaseous ammonia sensing. The sensing mechanism of the tungstated-zirconia thick film has been investigated by means of in situ FT/IR and H/D isotope effect. In the absence of ammonia, the role of protonic conduction was clarified by the H/D isotope effect of water vapor on the conductivity. In the presence of gas phase ammonia, the conductivity of the tungstated-zirconia thick film significantly increased. The conductivity in the presence of ammonia showed unique temperature dependence, i.e., the conductivity at first increased with a decrease in temperature, showed the maximum at 633 K, and then decreased with further decrease in temperature. In situ FT/IR spectra revealed the presence of both ammonium ion adsorbed on Brønsted acid site and ammonia coordinated to Lewis acid site on the tungstated-zirconia surface. Temperature dependence and dynamic response of the conductivity were in good accordance with the surface concentration of ammonium ion adsorbed on Brønsted acid site. The contribution of ammonium ion to electric conductivity was indicated. The role of ammonium ion as a migrating species for ammonia sensing was verified from negligible H/D isotope effect of ammonia and mobility of ammonium ion.
Red selenium nanoparticles and gray selenium nanorods as antibacterial coatings for <scp>PEEK</scp> medical devices (2015)

Bacterial infections are commonly found on various poly(ether ether ketone) (PEEK) medical devices (such as orthopedic instruments, spinal fusion devices, and segments in dialysis equipment), and thus, there is a significant need for introducing antibacterial properties to such materials. The objective of this in vitro study was to introduce antibacterial properties to PEEK medical devices by coating them with nanosized selenium. In this study, red selenium (an elemental form of selenium) nanoparticles were coated on PEEK medical devices through a quick precipitation method. Furthermore, with heat treatment at 100°C for 6 days, red selenium nanoparticles were transferred into gray selenium nanorods on the PEEK surfaces. Bacteria test results showed that both red and gray selenium-coated PEEK medical devices significantly inhibited the growth of Pseudomonas aeruginosa compared with uncoated PEEK after either 1, 2, or 3 days. Red selenium nanoparticle-coated PEEK showed less bacteria growth on its surface than gray selenium nanorod-coated PEEK after 3 days. This study demonstrated that red, and to a lesser extent gray, nanosized selenium could be used as potential antibacterial coatings to prevent bacteria function on PEEK medical devices. © 2015 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 104B: 1352-1358, 2016.
Pre-equalization for MISO DS-UWB systems with pre-Rake combining (2009)

In this paper, we propose two novel pre-equalization schemes for multiple-input single-output (MISO) direct-sequence ultra-wideband (DS-UWB) systems with pre-Rake combining and symbol-by-symbol detection. The first scheme employs one pre-equalization filter (PEF) per transmit antenna, whereas in the second scheme, the simplified PEF (S-PEF) scheme, all transmit antennas share the same PEF. For both schemes the optimum finite impulse response (FIR) and infinite impulse response (IIR) PEFs are calculated based on the minimum mean squared error (MMSE) criterion. Our approach is sufficiently general to include also reduced-complexity versions of pre-Rake combining that employ a limited number of Rake fingers. We show that under certain conditions the S-PEF scheme achieves the same performance as the more complex PEF scheme. We also demonstrate that a single-input multiple-output (SIMO) DS-UWB system with post-Rake combining and MMSE post-equalization is the dual system to the considered MISO DS-UWB system with pre-Rake combining and MMSE pre-equalization. This uplink-downlink duality can be exploited for efficient calculation of the PEFs and for complexity reduction. Our simulation results show that the proposed PEF schemes achieve significant performance gains over pre-Rake combining without equalization, even if only short PEFs are employed.
Image acquisition technique for high dynamic range scenes using a multiband camera (2006)

Abstract Multiband cameras have been studied and developed for accurate color reproduction. On the other hand, high dynamic range image acquisition is also strongly desired in many applications. Multiband cameras can potentially meet both needs if their sensitivities are properly controlled. In this article, a method for expansion of the dynamic range that uses a six‐band camera consisting of three high‐sensitivity bands and three low‐sensitivity bands is introduced. Experimental results demonstrating the effectiveness of the method are also shown. © 2006 Wiley Periodicals, Inc. Col Res Appl, 31, 294–302, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/col.20231
Knowledge-aided signal processing: a new paradigm for radar and other advanced sensors (2006)

Recently, significant progress has been made in the development of physics-based, knowledge-aided (KA) signal processing strategies supported by improvements in real-time embedded computing architectures. These developments provide designers of advanced sensor systems an unprecedented degree of flexibility when implementing next generation adaptive sensor systems. In the case of radar, this has been manifested in the first ever, real-time, KA space-time adaptive processing (KA-STAP) system for advanced clutter/interference suppression. This paper provides exemplars of real-world effects giving rise to the need for "intelligent" adaptation schemes and overviews the KA approach to sensor signal processing in some detail. Moreover, we survey a collection of papers describing recent KA sensor research that follow in this issue
Coagulative and fibrinolytic properties of ascitic fluid associated with ovarian tumors (1975)

Ascitic fluid samples from 19 patients with ovarian carcinoma, 3 with a benign ovarian tumor, and 5 with cirrhosis of the liver were examined for their content of coagulation factors and components of the fibrinolytic system. The concentration of trypsin inhibitors in the ascitic fluid was significantly higher in the presence of carcinoma. Large amounts of FDP were found in the ascitic fluid in all patients with malignant tumors, but not in the other two groups. Determination of FDP may therefore make it possible to differentiate between malignant and nonmalignant ascitic fluid.
Inactivation of the human P2Y12 receptor by thiol reagents requires interaction with both extracellular cysteine residues, Cys17 and Cys270 (2003)

Human platelets express 2 G protein-coupled nucleotide receptors: the platelet adenosine diphosphate (ADP) receptor coupled to stimulation of phospholipase C (P2Y(1)) via heterotrimeric guanosine 5-triphosphate (GTP)-binding protein G(q), and the platelet ADP receptor coupled to inhibition of adenylyl cyclase (P2Y(12)) via heterotrimeric GTP-binding protein G(i). Although these 2 receptors are encoded on the same chromosome and have similar pharmacologic profiles, they have different reactivities toward thiol reagents. The thiol agent p-chloromercuribenzene sulfonic acid (pCMBS) and the active metabolites from antiplatelet drugs, clopidogrel and CS-747, inactivate the P2Y(12) receptor and are predicted to interact with the extracellular cysteine residues on the P2Y(12) receptor. In this study we identified the reactive cysteine residues on the human P2Y(12) receptor by site-directed mutagenesis using pCMBS as the thiol reagent. Cys97Ser and Cys175Ser mutants of the P2Y(12) receptor did not express when transfected into Chinese hamster ovary (CHO-K1) cells, indicating the essential nature of a disulfide bridge between these residues. The Cys17Ser, Cys270Ser, and Cys17Ser/Cys270Ser double mutants had similar median effective concentration (EC(50)) values for ADP and 2-methylthio-ADP (2-MeSADP) when compared with the wild-type P2Y(12). Similarly, the median inhibitory concentration (IC(50)) values for BzATP (2',3'-O-(4- benzoylbenzoyl) adenosine 5'-triphosphate), an antagonist of the P2Y(12) receptor, also did not differ dramatically among these mutants and the wild-type P2Y(12) receptor. pCMBS inactivated the wild-type P2Y(12) receptor in a concentration-dependent manner, whereas it had no effect on the P2Y(1) receptor. Finally, pCMBS partially affected the G(i) coupling of Cys17Ser or Cys270Ser receptor mutants, but had no effect on Cys17Ser/Cys270Ser P2Y(12) receptor-mediated inhibition of adenylyl cyclase. These results indicate that, unlike the P2Y(1) receptor, which has 2 essential disulfide bridges linking its extracellular domains, the P2Y(12) receptor has 2 free cysteines in its extracellular domains (Cys17 and Cys270), both of which are targets of thiol reagents. We speculate that the active metabolites of clopidogrel and CS-747 form disulfide bridges with both Cys17 and Cys270 in the P2Y(12) receptor, and thereby inactivate the receptor.
A Retrospective of Platform Development in Cook Inlet, Alaska (1989)

ABSTRACT Some twenty years ago a number of unique offshore platforms were installed in Cook Inlet, Alaska. These structures are, to date, still the only oil and gas platforms operating in an ice environment. Although originally designed for a field life of twenty years, higher oil prices, and also the discovery of field extensions, now make it likely that several of these platforms will remain in place for as long as fifty years. The paper provides a retrospective of the design and installation methods that were developed for these platforms and describes the inspection procedures and corrosion preventive measures that have been taken to prolong the life of these structures. INTRODUCTION During the early 1960's four oil fields and one gas field were developed in Cook Inlet, Alaska. These fields, see Figures 1 and 2, were placed on production with fourteen self contained drilling and production platforms, see Table 1, which were installed in a four year period from 1964 to 1968. A fifteenth platform was added in 1986. The rapid development of these five fields was an extraordinary accomplishment because environmental conditions in Cook Inlet make this area one of the more difficult offshore areas to operate in. The combination of ice, tides, current, bitter cold and earthquakes made the design, fabrication and installation of these platforms a formidable technical challenge. One reason why this development was able to proceed as rapidly as it did was that twenty years ago there still existed an aura of cooperation between the oil industry, the responsible governmental agencies, and the public. It is questionable whether the same type of development could be accomplished today in two or three times the length of time, if at all. The discovery of the immense Prudhoe Bay field on the North Slope of Alaska shortly after the initiation of production from Cook Inlet has tended to overshadow these accomplishments and has made this area, in a remote corner of the world to begin with, a bit of a forgotten offshore area. Yet, even today, some 20 years later, these Cook Inlet platforms are still the only fixed offshore drilling and production platforms anywhere in the world that operate in an ice environment. The initial development plans for the Cook Inlet fields anticipated an economical field life of about 20 years and the platform designs were based on this assumption. These twenty years, however, have now passed and, because of new field extensions and secondary recovery projects, it now appears that several of the fields have a further remaining economic life of 25 years or more. This implies that the platform structures will also need to remain in place for this period of time because replacement, at least with current oil prices, would not be economical. That this platform life extension is possible is attributable to, amongst others, the conservative design criteria assumptions that were used, and also to an early recognition that special measures were needed to arrest a high rate of corrosion of the underwater portions of the platform structures.
Scaffold-Based Delivery of Autologous Mesenchymal Stem Cells for Mandibular Distraction Osteogenesis: Preliminary Studies in a Porcine Model (2013)

It is technically feasible and biologically sound to deliver autologous BM-MSCs to the distraction site immediately after osteotomy using a Gelfoam scaffold to enhance mandibular DO.
NEW TECHNIQUES FOR INCREASING ANTENNA BANDWIDTH WITH IMPEDANCE LOADING (2011)

New methods are presented for increasing the bandwidth of wire antennas using impedance loading. This paper extends the seminal Wu-King theory of the internal impedance proflle that produces travelling-wave only current modes on a center-fed dipole antenna. It also presents a numerical optimization methodology based on Central Force Optimization, a new deterministic multidimensional search and optimization metaheuristic useful for problems in applied electromagnetics. A CFO-optimized loaded monopole antenna is described in detail and compared to the same structure loaded with a fractional Wu-King proflle. The CFO monopole generally performs better than other designs using either the full or fractional Wu-King proflles or the extended Wu-King proflles. The methods described in this paper should be useful in any wire antenna design that utilizes impedance loading to increase bandwidth.
Histone H1 Suppresses Tumor Growth of Leukemia Cells In Vitro, Ex Vivo and in an Animal Model Suggesting Extracellular Functions of Histones (1996)

Purified histone H1 exerts growth inhibition of leukemia cells independent of lineage, stage, and maturation. At 200 micrograms/ml, H1 proved cytotoxic in 19 of 21 of the tested leukemia-derived cell lines and for 11 of 16 of the fresh tumor samples from leukemia patients. In all cases, normal peripheral blood mononuclear cells and bone marrow cells remained unaffected. Multicellular spheroids from the Burkitt's lymphoma cell line IM-9 were growth arrested at 500 micrograms H1/ml. The clonogenic growth of the Burkitt's lymphoma cell line Daudi was arrested at 160 micrograms H1/ml. Synthetic H1-peptides as well as peptides and proteins with biochemical properties similar to H1 had no inhibitory growth effect at equimolar concentrations. Furthermore, 250 micrograms H1 injected into a Burkitt's lymphoma (Daudi), xenotransplanted into nude mice, arrested tumor growth. As shown by electron microscopy and flow cytometry, incubation of leukemia cells with H1 resulted in severe plasma membrane damage and ultimately cytolysis. This report characterizes a 33-kd protein that binds H1 and is responsible for the cell death via destruction of the cell membrane integrity. New extranuclear functions of histones are presented.
A New Approach to Proactive Recovery (2005)

Recent papers propose asynchronous protocols that can tolerate any number of faults over the lifetime of the system, provided that at most f nodes become faulty during a given window of time. This is achieved through the so-called proactive recovery, which consists of periodically rejuvenating the system. Proactive recovery in asynchronous systems, though a major breakthrough, has some limitations which we identified in a recent work. In fact, proactive recovery protocols typically require stronger environment assumptions (e.g., synchrony, security) than the rest of the system. In this paper, we take this in consideration and propose a new approach to proactive recovery that is based on an architecturally hybrid distributed system model. In this context, we present a secure real-time distributed component — the Proactive Recovery Wormhole (PRW) — that aims to execute, in a more dependable and effective way, proactive recovery protocols. We also briefly show how PRW can be used in practice to enhance the dependability of an existent proactive recovery based system.
K-band combined GaAs monolithic Doherty power amplifier (2018)

This paper presents the design, simulations, and measurements of a 35 dBm K-band Doherty power amplifier, fabricated on 0.15μm GaAs monolithic technology of Qorvo. The power amplifier is based on combining on-chip two Doherty modules with a matching power combiner. To demonstrate the power scaling and gain a better insight into the design, the single Doherty module has been fabricated and characterized as well. The Doherty output matching is designed for maximizing the bandwidth and minimizing the components count, with the output capacitance of the active devices determining the impedance inverter impedance. The combined Doherty shows an output power of 35 dBm at 24 GHz, that is almost exactly 3 dB larger than the single Doherty module power module, and with a 6 dB OBO efficiency of 27%, and a gain of 11.5dB. It compares well with the state of the art, representing the highest power GaAs Doherty at similar frequencies.
Experimental Study on Combustion and Pollutant Control of Biobriquette (2000)

To control pollutant emissions from the combustion of both domestic stoves and small-capacity industrial boilers, an artificial solid fuel called biobriquette has been developed. It is manufactured from a mixture of coal, biomass (sawdust), and desulfurizer under a high compression pressure. In this study, the combustion experiments were performed to elucidate the ignition and combustion characteristics of biobriquette. Comparisons were made between coal briquettes and biobriquettes for their combustion efficiencies and pollutant emissions in existing domestic stoves. Byproduct in the gas welding industry was used as a new desulfurizer in the biobriquette, and its desulfurization characteristics were studied. The experimental result shows that the biobriquette has a lower ignition temperature and a higher combustion efficiency than the coal briquette. The new desulfurizer was found to be more effective in desulfurization than the other two desulfurizers, limestone and scallop shell. It is also found that the biobriquette combustion in domestic stoves gives lower CO2 emission than the normal coal briquette. The developed biobriquette provides a simple, economical, and efficient way for coal utilization and pollutant control in some developing countries.