gebhart/patrepeval huggingface dataset:
Propagation and recording of converted shear waves in a simulated marine environment: Physical model study (1993)

PreviousNext No AccessSEG Technical Program Expanded Abstracts 1993Propagation and recording of converted shear waves in a simulated marine environment: Physical model studyAuthors: Radmilo GregovicJohn A. McDonaldRobert H. TathamRadmilo GregovicUniversity of Houston, John A. McDonaldUniversity of Houston, and Robert H. TathamTexaco, Inc.https://doi.org/10.1190/1.1822662 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Permalink: https://doi.org/10.1190/1.1822662FiguresReferencesRelatedDetails SEG Technical Program Expanded Abstracts 1993ISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 1993 Pages: 1396 publication data© 1993 Copyright © 1993 Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished: 10 Feb 2005 CITATION INFORMATION Radmilo Gregovic, John A. McDonald, and Robert H. Tatham, (1993), "Propagation and recording of converted shear waves in a simulated marine environment: Physical model study," SEG Technical Program Expanded Abstracts : 942-945. https://doi.org/10.1190/1.1822662 Plain-Language Summary PDF DownloadLoading ...
Synthesis and Electrochemical Properties of Novel Aromatic Poly(amine−amide)s with Anodically Highly Stable Yellow and Blue Electrochromic Behaviors (2008)

A new triphenylamine-containing aromatic diamine, 4,4′-bis[4-aminophenyl(4-methoxyphenyl)amino)]-4′′-methoxytriphenylamine (5), was successfully synthesized by the Ullmann reaction of 4,4′-dibromo-4′′-methoxytriphenylamine (2) with 4-methoxy-4′-nitrodiphenylamine (3), followed by palladium-catalyzed hydrazine reduction of the dinitro (4) intermediate. A series of novel polyamides having inherent viscosities of 0.22−0.64 dL/g were prepared via the direct phosphorylation polycondensation from the diamine and various dicarboxylic acids. All the polymers were amorphous with good solubility in many organic solvents, such as N-methyl-2-pyrrolidinone (NMP) and N,N-dimethylacetamide (DMAc), and could be solution-cast into polymer films. These aromatic polyamides had useful levels of thermal stability associated with their relatively high softening temperature (200−244 °C), 10% weight-loss temperatures in excess of 460 °C, and char yields at 800 °C in nitrogen higher than 55%. The hole-transporting and electrochromic properties are examined by electrochemical and spectroelectrochemical methods. Oxidation of compound 4 was proved by using an optically transparent thin-layer electrode (OTTLE) cell coupled with UV−vis/NIR spectroscopy. Reversibility of the first oxidation was up to 99%, second oxidation was 94%, and third oxidation was 80%. Polyamide Ic shows the reversibility of the first oxidation was up to 100%, second oxidation was 99%, and third oxidation was 75%. Cyclic voltammograms of the polyamide films cast onto an indium−tin oxide (ITO)-coated glass substrate exhibited three reversible oxidation redox couples (E1/2) at 0.39−0.47, 0.64−0.72, and 1.02−1.13 V vs Ag/AgCl in acetonitrile solution, and polyamide Ie showed additional fourth reversible oxidation redox couples at 1.07 V. The polyamide films revealed excellent reversible stability of anodic electrochromic characteristics with a color change from the colorless or pale yellowish neutral form to yellow and blue oxidized form at applied potentials ranging from 0.00 to 0.80 V. These electrochromic materials not only showed good coloration efficiency of yellow (CE = 203 cm2/C) and blue (CE = 194 cm2/C) but also exhibited high contrast of optical transmittance change (ΔT %) up to 59% at 443 nm for yellow and 79% at 1080 nm for blue. After over 500 cyclic switches, the polymer films still exhibited excellent stability of electrochromic characteristics.
A Digital Gigapixel Large-Format Tile-Scan Camera (2010)

Although the resolution of single-lens reflex (SLR) and medium-format digital cameras has increased in recent years, applications for cultural-heritage preservation and computational photography require even higher resolutions. Addressing this issue, a large-format cameras' large image planes can achieve very high resolution without compromising pixel size and thus can provide high-quality, high-resolution images.This digital large-format tile scan camera can acquire high-quality, high-resolution images of static scenes. It employs unique calibration techniques and a simple algorithm for focal-stack processing of very large images with significant magnification variations. The camera automatically collects overlapping focal stacks and processes them into a high-resolution, extended-depth-of-field image.
<i>In situ</i> real-time studies of nickel silicide phase formation (2001)

The formation of NiSi films on Si was studied using Rutherford backscattering spectrometry, atomic force microscopy, and ellipsometry. NiSi is an attractive candidate for use as a gate contact material due to its low metal-like resistivity and large processing window (350–750 °C). Three phases, Ni2Si, NiSi, and NiSi2, were identified in this temperature range, and their optical databases in the 2–4 eV photon range were established, and used to model real-time ellipsometry data. It is shown that real-time ellipsometry can be used to monitor and follow the formation of the various Ni–Si phases. We have also observed the onset of agglomeration of the silicide for longer time anneals at temperatures of 500–700 °C, which is much lower than 1000 °C where agglomeration has been reported to occur.
Optically Monitored Electrical Switching in VO<sub>2</sub> (2015)

We demonstrate a hybrid silicon–vanadium dioxide (Si-VO2) electro-optic modulator that enables direct probing of both the electrically triggered semiconductor-to-metal phase transition in VO2 and the reverse transition from metal to semiconductor. By using a two-terminal in-plane VO2 electrical switch atop a single-mode silicon waveguide, the phase change can be initiated electrically and probed optically, separating the excitation and measurement processes and simplifying the analysis of the metal-to-semiconductor dynamics. We demonstrate a record switch-on time for high-speed electrical semiconductor-to-metal transition, with switching times less than 2 ns, and quantify the slower inverse transition, which is dominated by thermal dissipation and relaxation of the metallic rutile lattice to the monoclinic semiconducting phase. By limiting the current through the VO2 to reduce Joule heating, we enable inverse relaxation times as fast as 3 ns.
On focus, distinctive competence, and cost containment. (1984)

Significant changes in diagnostic medical imaging technology and reimbursement over the past several years have forced hospital administrators to strengthen current efforts and advance into new directions of management. Radiology administrators do not stand alone in this regard, and are in an excellent position to introduce sound management techniques into operations which can benefit hospitals as a whole. This paper addresses several strategic planning and operations management concepts which can positively impact the roles and efforts of radiology administrators, as well as enable them to provide a more significant management support function within hospitals today and in the future.
Detailed OFDM modeling in network simulation of mobile ad hoc networks (2004)

In mobile ad hoc network (MANET) studies, it is imperative to use highly detailed device models as they provide high layer protocols with good prediction of underlying wireless communication performance. However, such studies often utilize abstract models for execution speed and simplicity. This paper first shows that physical layer variables including path loss, shadowing, multipath, Doppler have significant effects on the predicted overall networking performance. It then proposes an approach to simulate details of wireless propagation and radio characteristics in networking studies while still maintaining a reasonable simulation execution time. Through our runtime performance studies with detailed OFDM Simulink/MATLAB models and QualNet network simulator, it is shown that the proposed approach can improve the simulation runtime performance by three to four orders of magnitudes without compromising the fidelity of simulation results.
Organometallic materials in lithography: A review (1988)

Organosilicon polymers have found many uses in the electronics industry in the last 25 years due to their low-dielectric constant and water-repelling properties. These uses include insulators and encapsulating materials (RTV) for electronic parts. More recently, siloxanes have been incorporated into polyimides for the purpose of increasing the water resistance, improving mechanical properties, and preventing atomic oxygen attack of polyimides [R. H. Bott, J. D. Summers, C. A. Arnold, L. T. Taylor, T. C. Ward, and J. E. McGrath, J. Adhes. 23, 67 (1987)]. In only the last few years, some uses of organosilicon polymers in lithography have been reported. In this paper, a review of these uses will be presented and the requirements for organosilicon materials in lithographic applications will be outlined.
A5.1 - Intensity Determination of Cavitation at Rotating Pumps by Means of Integrated Miniaturised Pressure Transducers (2009)

In this paper we present a method of cavitation detection with miniaturised pressure transducers in rotodynamic pumps. The process is part of a sensor system for pumps and make it possible to detect the operational mode. Cavitation generates surges which are directed by the fluid to the ambiend pipes and casings and hit them. The vibrations at the surface can be measured by accelerators. Thus, the existence of cavitatation is detectable. The idea is now, to detect the cavitation directly by a pressure transducer and use it like a hydrophon. The difference is that pressure transducers already integrated in the pump for pressure measurement, a hydrophon would be an additional element in the system which probably would only be used for this new system functionallity.
P17.51 * FUNCTIONAL PREDICTION OF MITOCHONDRIAL DNA MUTATIONS IN GLIOBLASTOMA MULTIFORME (2014)

Gliobastoma multiforme (GBM) is the most common adult primary brain tumour. It is highly malignant with fewer than half of patients surviving for over one year following diagnosis. One reason for this is its highly heterogeneous nature, which renders the current standard-of-care treatment of surgical resection, radiotherapy, and temozolomide (TMZ) chemotherapy inadequate. Altered metabolism is a hallmark of cancer compared to non-cancer cells and central to this are mitochondria, which contain their own multi-copy circular DNA (mtDNA). At the heart of every mitochondrion is a collection of five large protein machines known as the respiratory chain (RC). The RC consists of approximately 70 subunits. MtDNA-encodes thirteen of the core catalytic subunits that form the RC. Variations in mtDNA can therefore directly affect metabolism and contribute to the pathology of numerous human diseases, including cancer. The acquisition of TMZ-resistance and decreased overall survival in GBM patients has been linked to altered RC activity but the contribution of mtDNA variations to this remains unexplored. To address this we have employed a novel dual approach for (1) discovering and (2) predicting the function of mtDNA variations in GBM patients using a combination of long PCR and next generation sequencing and 3D structural analysis, respectively. We have generated a set of 10 high quality mtDNAs each from GBM-biopsy derived cells with a mean depth of coverage per nucleotide of over 22,000. This enabled a total of 193 mtDNA variations to be detected, including those present at less than 1% heteroplasmy. Twenty five of these variations caused non-synonymous amino acid substitutions (AAS) in mtDNA-encoded Complex III and IV proteins. Using 3D structural analysis, we predict that 8 of these are highly likely to be functional, occurring in RC active sites, substrate/drug binding pockets and protein-protein interaction regions. The latter class will affect the assembly and stability of the RC complexes. All functional candidates were absent from the non-neoplastic astrocytic control, and mining the human mtDNA database revealed the majority never, or very rarely, occur in healthy subjects. Long PCR and next generation sequencing provides a high throughput, cost effective and sensitive method for detecting mtDNA variations in GBM. While 3D structural analysis reveals considerable insight into the functional role of mtDNA variations, including how they could affect metabolism and contribute to the differential survival and chemosensitivity of individual patients. This study forms an important first step towards determining the functional and clinical significance of mtDNA variations in GBM. The next step will be to validate the functional and clinical significance of the candidate variations so that better predictors of outcomes and more personalised therapies can be developed for patients in the future.
Antibodies against Native and Oxidized Cardiolipin and Phosphatidylserine and Phosphorylcholine in Atherosclerosis Development (2014)

High levels of IgM anti-OxPS and anti-OxCL, but not traditional anti-phospholipid antibodies (anti-PS and anti-CL), are associated with protection against atherosclerosis development. In addition, low IgM anti-PC was a risk marker but high a protection marker.
Relation between encoder and syndrome former variables and symbol reliability estimation using a syndrome trellis (2003)

We derive a linear correspondence between the variables of an encoder and those of a corresponding syndrome former. Using the derived correspondence, we show that the log-likelihood ratio of an information bit conditioned on a received sequence can be equally calculated using the syndrome trellis. It is shown that the proposed method also applies to recursive systematic convolutional codes which are typical constituent codes for turbo codes. Moreover, we show that soft-in syndrome decoding considering a priori probabilities of information bits is possible in the same way as for Viterbi decoding based on the code trellis. Hence, the proposed method can be applied to iterative decoding such as turbo decoding. We also show that the proposed method is effective for high-rate codes by making use of trellis modification.
A novel encryption method (2016)

According to the principle of digital chaos encryption technology we design chaotic encryption algorithm based on the random variation of parameters. By using sequence quantized value chaos iteration is controlled, parameters in the process of chaotic mapping iteration are randomly changed, and the random switching of multi-chaotic systems is realized, finally achieve the purpose of disturbing chaos orbits and resisting chaos degradation; By using the one-dimensional piecewise linear chaotic mapping (Pwlcm) as a pseudo-random sequence generator, we design a sequence encryption algorithm of bi-chaotic system; Through nonlinear operations to the 0-1 sequence of double chaotic systems, the nonlinear combination of the system has been realized. It is proved to have good cryptographic properties and good encryption results by the image encryption test.
Design of differential Near-Infrared Spectroscopy based Brain Machine Interface (2009)

Near-infrared spectroscopy (NIRS) is a non-invasive technology for measuring brain activity. Recently, the number of research papers on brain machine interface (BMI) based on NIRS technology is increasing. NIRS is a safe and convenient technique but its measurement results are unstable. To improve reliability of NIRS-based BMI, methods to extract stable data from NIRS signals are necessary. This paper describes a reliable NIRS-based BMI system we have developed. The feasibility of the method was demonstrated through generating motion of a humanoid robot.
Synchronization for passive optical networks (1995)

There is widespread interest in the passive optical network as a solution for a future fiber in the loop network. This paper addresses the problem of synchronization at the line termination of a passive optical network that uses high-speed time division multiple access. Synchronization is a critical function since each asynchronous transfer mode (ATM) cell arrives with unknown phase. An ASIC has been developed to perform this function at 622 Mb/s and is outlined here.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
Assessment of causes of irreversible fouling in powdered activated carbon/ultrafiltration membrane (PAC/UF) systems (2011)

Powdered Activated Carbon (PAC) has been successfully used in conjunction with membrane ultrafiltration (UF) to reduce taste, odour, colour and other concerns caused by organic material present in raw drinking water sources. PAC addition also typically significantly reduces the extent of fouling in hybrid PAC/UF systems. However, in some cases, PAC addition can have a significant negative effect by increasing irreversible membrane fouling. The present study was developed to assess the cause of irreversible fouling in a system for which PAC addition had a negative effect. The first part of the study evaluated if irreversible fouling could potentially be due to the breakdown of PAC particles in a PAC/UF membrane system. Particle size analysis of the virgin PAC suggested that pore plugging was unlikely because the PAC was too large. However, when exposed to relatively high shear conditions typical of UF systems, the size of the PAC was observed to decrease to a range comparable to that of the size of the pores in the UF membranes used. However results from the analysis of a bench scale PAC/UF system suggested that irreversible fouling was not solely due to the direct plugging of membrane. The decrease in the permeability for the irreversibly fouled system with PAC was observed to be linear over time, suggesting that irreversible fouling was possible due to the formation of a cake layer by PAC. This was confirmed with FESEM imaging. The second part of the study aimed to characterize the foulants in the cake layer on PAC/UF hollow fibres. FESEM and SEM-EDX were performed to obtain insight on the characteristics of the membrane surface of the hollow fibres. Sonication and a novel solubilisation technique were used to analyze the foulants in/on the membrane surface of the hollow fibres. Organic and inorganic material extracted from the fouled membrane suggested that these have great influence on the PAC cake layer formation on membrane fibres. The results from the study indicate that PAC does not cause irreversible membrane fouling in PAC/UF systems by itself, but it may facilitate the absorption of organic and inorganic material causing irreversible fouling.
The improved lytic function and <i>in vivo</i> efficacy of monovalent monoclonal CD3 antibodies (1989)

A series of hybrid-hybridomas were derived by the cell fusion of a CD3 antibody-secreting hybridoma with other Ig-producing cell lines. The Ig molecules secreted by these hybrid-hybridomas were fractionated by ion-exchange chromatography, and fractions containing monovalent CD3 antibodies were tested for complement-mediated lysis of T cells. Two monovalent CD3 antibodies with mixed heavy chain isotypes were very poor in lysis but, in contrast, a monovalent antibody possessing two identical rat gamma 2b heavy chains but two non-identical light chains was found to be more lytic with human complement than the parental bivalent CD3 antibody. The difference in lysis was not readily explicable in terms of a difference in complement activation at the level of C1q binding or cell-associated C3. A highly purified batch of this lytic monovalent CD3 antibody was prepared in a form suitable for in vivo therapy. In a preliminary clinical study in one patient with a T lymphoma in leukemic phase this monovalent CD3 antibody was found to be very effective in depleting CD3+ tumor cells in the peripheral blood and bone marrow. The cells in the peripheral blood were completely cleared and there was no evidence for antigenic modulation. In addition the antibody was able to reverse cell-mediated kidney rejection in three kidney graft patients. These results suggest that monovalent antibody may be effective in vivo as well as in vitro and that a fuller clinical evaluation is justified.
Reversible Gelation in Semidilute Aqueous Solutions of Associative Polymers:  A Small-Angle Neutron Scattering Study (1999)

Thermally reversible gelation in 1% aqueous solutions of poly(ethylene oxide)-b-poly(propylene oxide)-b-poly(ethylene oxide)-g-poly(sodium acrylate) has been observed. The transition that occurs as the temperature is increased through the gelation threshold (Tgel) is clearly observable by rheological and small-angle neutron scattering (SANS) measurements. SANS measurements suggest that within the hydrogel there exists an unusually uniform matrix of scattering centers, attributed to close packing of micelle-like aggregates surrounded by highly hydrated poly(sodium acrylate) and unassociated ethylene oxide/propylene oxide copolymer. The physical cross-linking caused by these scattering centers induces gelation. Direct model fits to the SANS data suggest that the scattering centers are similar in structure, but somewhat smaller than micelles of the poly(ethylene oxide)-b-poly(propylene oxide)-b-poly(ethylene oxide) component, with a dehydrated poly(propylene oxide) core of radius 30 Å surrounded by a hydrated PEO corona of outer radius 60 Å.
Association of cytochrome b5 with 16-androstene steroid synthesis in the testis and accumulation in the fat of male pigs. (1999)

The 16-androstene steroids, one of the principal causes of boar taint, are synthesized in the testis by the andien-beta synthase enzyme system. This system has been shown in vitro to involve both cytochrome P450c17 and cytochrome b5. The objective of this work was to investigate the relationship between the levels of cytochrome b5 in the testis, in vitro steroidogenesis, and the accumulation of 16-androstene steroids in the fat of pubertal boars. We found that the in vitro rate of 16-androstene steroidogenesis in testis microsomes was correlated with 16-androstene steroid concentrations in fat (r = .66, P < .01). Western blots were used to determine the amounts of cytochrome b5 and cytochrome P450c17 protein in testis, and two immunoreactive cytochrome b5 proteins of approximately 12 and 16 kDa were found. Levels of cytochrome P450c17 or the high molecular weight cytochrome b5 in testis were not significantly correlated to levels of 16-androstene steroids in fat. However, levels of total cytochrome b5 immunoreactive protein and levels of the low molecular weight immunoreactive cytochrome b5 were correlated to fat 16-androstene steroid concentrations (r = .59, P < .001; r = .72, P = .0001, respectively). Levels of the low molecular weight immunoreactive cytochrome b5 were also correlated to 16-androstene steroid synthesis rates in vitro (r = .62, P < .05). These results indicate that increased levels of a low molecular weight immunoreactive cytochrome b5 protein, and not of cytochrome P450c17, are related to increased testicular 16-androstene steroid production and accumulation in fat. These results support the hypothesis that selection for reduced levels of this low molecular weight immunoreactive cytochrome b5 protein in the testis may result in decreased levels of 16-androstene steroids in fat and reduced boar taint in uncastrated male pigs.