gebhart/patrepeval huggingface dataset:
Towards the tomographic inversion of prismatic reflections (2001)

PreviousNext No AccessSEG Technical Program Expanded Abstracts 2001Towards the tomographic inversion of prismatic reflectionsAuthors: Karine BrotoPatrick LaillyKarine BrotoInstitut Français du Pétrole and Patrick LaillyInstitut Français du Pétrolehttps://doi.org/10.1190/1.1816733 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Permalink: https://doi.org/10.1190/1.1816733FiguresReferencesRelatedDetailsCited ByTopography-Dependent Q -Compensated Least-Squares Reverse Time Migration of Prismatic WavesIEEE Transactions on Geoscience and Remote Sensing, Vol. 60Depth seismic imaging using reflection and first arrival traveltime tomography: Application to a deep profile across the Northern Emirates Foothills14 September 2012Recursive imaging with multiply scattered waves using partial image regularization: A North Sea case studyAlison E. Malcolm, Maarten V. De Hoop, and Bjørn Ursin7 March 2011 | GEOPHYSICS, Vol. 76, No. 23. Principles of Migration Using Wavefield-continuation Methods21 March 2012Suppressing unwanted internal reflections in prestack reverse-time migrationRobin P. Fletcher, Paul J. Fowler, Phil Kitchenside, and Uwe Albertin18 October 2006 | GEOPHYSICS, Vol. 71, No. 64. Principles of Wavefield-continuation Migration21 March 2012Migration of duplex wavesNaum Marmalyevskyy, Yury Roganov, Zinovy Gornyak, Alex Kostyukevych, and Viktor Mershchiy7 December 2005Prismatic reflections for the delineation of salt bodiesMaud Cavalca and Patrick Lailly7 December 2005Prestack imaging of overturned reflections by reverse time migrationBiondo Biondi and Guojian Shan3 January 2005 SEG Technical Program Expanded Abstracts 2001ISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2001 Pages: 2135 publication data© 2001 Copyright © 2001 Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished: 03 Jan 2005 CITATION INFORMATION Karine Broto and Patrick Lailly, (2001), "Towards the tomographic inversion of prismatic reflections," SEG Technical Program Expanded Abstracts : 726-729. https://doi.org/10.1190/1.1816733 Plain-Language Summary PDF DownloadLoading ...
Wavelet-based video coding using adaptive overlapped block motion compensation (2003)

In this paper, we propose a video coding scheme that combines adaptive overlapped block motion compensation (AOBMC) with wavelet-based zerotree coding techniques. AOBMC combines two different motion models: conventional block motion compensation (CBMC) and OBMC. Each model has the respective superiority in some case of motion compensation. This adaptive block-wise motion compensation between both models is used to get a smooth motion field. Smoothness properties of the motion field are employed to reduce temporal redundancies in the image sequence, offering substantial improvements in wavelet-based video coding quality over a variety of bit rates. For exploiting the spatial redundancies in the wavelet subband structure, we introduce a novel technique of zerotree quantization coding based on the human vision system. Our simulation results show that the proposed hybrid wavelet motion compensation video coding scheme provides a performance gain of 0.8-1.2 dB PSNR when compares to the standard H.263 test model TMN-5.
Peripheral Refraction in Myopic Patients After Orthokeratology (2010)

CRT inverts the pattern of peripheral refraction in spherical equivalent refraction, creating a treatment area of myopic reduction within the central 25 degrees of visual field, and a myopic shift beyond the 25 degrees. In peripheral refraction for 30 degrees and 35 degrees, the amount of myopia induced in terms of spherical equivalent has an almost 1:1 relationship with the amount of baseline spherical equivalent refraction to be corrected.
Analytical Investigations of Bacterial Cellulose (2005)

Abstract The cultivation of the bacterium Acetobacter xylinus AX 5 was carried out in the common Hestrin‐Schramm medium containing D ‐glucose as C‐source and citric acid as buffer component. HPLC studies proved to be convenient methods to investigate the stability and interactions of these constituents in the starting culture liquid. Within the initial sterilization step and limited by the citric acid, up to 6% of the D ‐glucose was partially isomerized to D‐fructose and degraded to dark‐yellow products. In static culture, A. xylinus AX 5 produces cellulose extracellularly on the surface of this medium. Solid‐state NMR spectroscopy represents a suitable analytical method to characterize the supramolecular structure of the bacterial cellulose in never‐dried, air‐dried, and freeze‐dried states. It could be demonstrated that the drying process reduces the degree of crystallinity in the range of about 12% without changes in the Iα/β ratio of these cellulose modifications.
Study on the test method for a frequency converter with an embedded local oscillator in satellite (2015)

Beginning with the test demand of frequency converter with embedded local oscillator in satellite, this paper, combining the technical feature of multifunctional vector network analyzer, puts forward a precise test method, which is based on frequency tracking and vector mixer calibration technique regarding the test requirement of group delay and conversion loss of frequency converter with embedded local oscillator. Through the result, we can see that the test method is accurate, feasible and can provide effective technical measures for the performance testing and evaluation of the frequency converter with embedded local oscillator in satellite.
Resolution is influenced by the temporal processing of the human visual system (2005)

Introduction: Few studies have examined the possibility of a relationship between spatial processing and temporal processing. The current study addresses this issue by psychophysically measuring both resolution and flicker sensitivity in the same observers. Methods: Resolution acuity (RA) and critical flicker fusion threshold (CFFT) were measured in 18 individuals (mean age = 18.7 years, females = 12). CFFT was assessed using the method of limits by a 1-deg diameter green test field. RA thresholds were obtained by using the method of constant stimuli. Two black bars (1-min. wide) against a white background were adjusted such that a gap was just noticeably present. Results: RA was found to be significantly and positively correlated with CFFT (N = 18, y = 0.1253x + 19.116, r = 0.474, p = 0.047). Discussion: The results of this study might indicate that as temporal processing becomes finer, spatial processing becomes more difficult. Fine temporal processing might be positively related to adaptation or fatigue. Consequently, this may suggest that when observers are engaged in a rigorous psychophysical task that requires a high degree of scrutiny and precision, fine temporal processors could artificially demonstrate decreased sensitivity due to increased susceptibility to fatigue.
Architectural support for efficient multicasting in irregular networks (2001)

Parallel computing on networks of workstations is fast becoming a cost-effective high-performance computing alternative to MPPs. Such a computing environment typically consists of processing nodes interconnected through a switch-based irregular network. Many of the problems that were solved for regular networks have to be solved anew for these systems. One such problem is that of efficient multicast communication. In this paper, we propose two broad categories of schemes for efficient multicasting in such irregular networks: network interface-based (NI-based) and switch-based. The NI-based multicasting schemes use the network interface of intermediate destinations for absorbing and retransmitting messages to other destinations in the multicast tree. In contrast, the switch-based multicasting schemes use hardware support for packet replication at the switches of the network and a concept known as multidestination routing to convey a multicast message from one source to multiple destinations. We first present alternative schemes for efficient multipacket forwarding at the NI and derive an optimal k-binomial multicast tree for multipacket NI-based multicast. We then propose two switch-based multicasting schemes that differ in the power of the encoding scheme and the complexity of the decoding logic at the switches. These multicasting schemes use path-based multidestination worms that can cover all nodes connected to switches along a valid unicast path and tree-based multidestination worms that can cover entire destination sets in a single phase using one worm, respectively. For each scheme, we describe the associated header encoding and decoding operation, the method for deriving multidestination worms that cover arbitrary multicast destination sets, and the multicasting scheme using the derived multidestination worms.
JET experiments with 120 keV<sup>3</sup>He and<sup>4</sup>He neutral beam injection and neutron diagnostic applications (1992)

Preliminary experiments were carried out in the Joint European Torus (JET) using 120 keV helium (He) neutral beam injection (NBI). Injected power levels up to 5 MW with 3He and 7 MW with 4He, lasting up to 3 s were reached. The 3 s helium NBI produced efficient ion heating and similar global and local energy confinements to those obtained with deuterium (D) NBI, in both limiter and X-point plasma geometries, in L-mode and H-mode plasma regimes. The elimination of beam-plasma and beam-beam fusion reactions by replacing D NBI with He NBI extended the range for measuring ion temperatures with the JET neutron profile monitor and neutron spectrometers.
Magnetic materials and structures for thin-film recording media (invited) (2000)

There have been three distinct stages in the development of magnetic materials and processes for thin-film media. The first era focused on designs for use with inductive heads. Vacuum sputter deposition techniques were developed to achieve high Hc, with high Ms materials epitaxially grown on Cr underlayers. The second phase of thin-film media development demanded media optimized for the use with MR heads. Noise reduction through the decoupling of grains by chemical segregation of Cr at the grain boundaries proved effective. The introduction of giant magnetoresistance heads required low noise and high Hc but added the necessity of the reduction in the average grain size and grain size distribution width. The next and perhaps final phase of thin-film media development will be focused on the minimization of the magnetization thermal decay by the use of materials and designs that produce high KuV/kBT ratios.
Self-sensing active magnetic levitation (1993)

A magnetic levitation method that combines all the known advantages of active magnetic bearings in a self-sensing configuration is presented. The method realizes stable and well-damped levitation without any sensor hardware at the rotor. This is achieved by using the coil voltage of the magnetic bearing as system input (voltage instead of current amplifiers) and the current as system output. The resulting system is observable and controllable in the sense of control theory, allowing a magnetic bearing to be stabilized with a simple linear controller using current measurements alone. Several self-sensing bearings have been constructed. Their performance is comparable to systems with sensors, but hardware requirements and costs are substantially reduced. Experimental results are included.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
Near‐Infrared Resonance Energy Transfer Glucose Biosensors in Hybrid Microcapsule Carriers (2008)

Fluorescence‐based sensing systems offer potential for noninvasive monitoring with implantable devices, but require carrier technologies that provide suitable immobilization, accessibility, and biocompatibility. Recent developments towards this goal include a competitive binding assay for glucose that has been encapsulated in semipermeable microcapsule carriers. This paper describes an extension of this work to increase the applicability to in vivo monitoring, wherein two significant developments are described: (1) a near‐infrared resonance energy transfer system for transducing glucose concentration, and (2) novel hybrid organic‐inorganic crosslinked microcapsules as carriers. The quenching‐based assay is a competitive binding (CB) system based on apo‐glucose oxidase (AG) as the receptor and dextran as the competitive ligand. The encapsulated quencher‐labeled dextran and near infrared donor‐labeled glucose receptor showed a stable and reversible response with tunable sensitivity of 1–5%/mM over the physiological range, making these transducers attractive for continuous monitoring for biomedical applications.
Prenylated Proteins: the Structure of the Isoprenoid Group (1990)

The mevalonate-derived portion of a prenylated protein from Chinese hamster ovary cells has been established as diterpenoid (C20). This group is linked to a carboxyl-terminal cysteine as a thioether. It was removed from the protein by hydrazinolysis followed by Raney nickel desulfurization, and the resulting hydrocarbon fraction was analyzed by gas chromatography-mass spectrometry.
A mechanistic investigation into the covalent chemical derivatisation of graphite and glassy carbon surfaces using aryldiazonium salts (2008)

Abstract Modification of carbon materials such as graphite and glassy carbon in bulk quantities using diazonium salts is developed. We used both 4‐nitrobenzenediazonium tetrafluoroborate and 1‐antharaquinonediazonium chloride to modify graphite and glassy carbon surfaces. Experiments were carried out in the presence and absence of hypophosphorous acid and the mechanism involved in both cases were studied using cyclic voltammetry. The observed peak potentials for both the 4‐nitrophenyl and 1‐anthraquinonyl modified materials were found to differ depending on whether or not the hypophosphorous acid reducing agent was used. In the absence of hypophosphorous acid the derivatisation reaction was inferred to go through a cationic intermediate, whilst in the presence of the hypophosphorous acid the mechanism likely involves either a purely radical intermediate or a mixture of radical and cationic species. Derivatisation experiments from 5 to 70°C allowed us to determine the optimum derivatisation temperature for both cases, in the presence and absence of hypophosphorous acid. Optimum temperature was 20°C for the former and 35°C for the later. Copyright © 2008 John Wiley & Sons, Ltd.
High-speed silicon electro-optical modulator that can be operated in carrier depletion or carrier injection mode (2008)

A high-speed silicon optical modulator has been demonstrated which can operate either in forward bias using carrier injection, or in reverse bias using carrier depletion. In forward bias, the device requires less than 10 mW of drive power, but has a low bandwidth of 100 MHz. In reverse bias, the device has a nearly flat response to 18 GHz, but requires 700 mW for large modulation depths.
Inhibition of the Expression of Mitogen-activated Protein Phosphatase-1 Potentiates Apoptosis Induced by Tumor Necrosis Factor-α in Rat Mesangial Cells (1998)

Previously we showed that rat mesangial cells are normally resistant to tumor necrosis factor-alpha (TNF-alpha)-induced apoptosis. They are made susceptible to the apoptotic effect of TNF-alpha when pretreated with actinomycin D, cycloheximide or vanadate. A sustained c-Jun N-terminal protein kinase (JNK) activation was closely correlated with the initiation of apoptosis under these conditions. We proposed that a TNF-alpha-inducible phosphatase was responsible for preventing a sustained activation of JNK and consequent apoptosis in these cells (Guo, Y.-L., Baysal, K., Kang, B. , Yang, L.-J., and Williamson, J. R. (1998) J. Biol. Chem. 273, 4027-4034). In the present study we provide further evidence to support this hypothesis. Ro318220, although originally identified as a specific inhibitor of protein kinase C, was subsequently found to be a strong inhibitor of MKP-1 expression. In rat mesangial cells, pretreatment of the cells with Ro318220 blocked expression of MKP-1 induced by TNF-alpha. This treatment also prolonged JNK activation and caused apoptosis. Taken together, our results support the currently controversial hypothesis that the JNK pathway is involved in TNF-alpha-induced apoptosis. In addition, we provide a mechanistic explanation for how mesangial cells in primary culture achieve resistance to TNF-alpha cytotoxicity. Specifically, induction of MKP-1 by TNF-alpha appears to be responsible for protection of the cells from apoptosis by preventing a prolonged activation of JNK.
A TCP-Driven MAC Resource Allocation Scheme in a WiMAX Network (2009)

The paradigm of a traditional wired network protocol stack is a hierarchy of services provided by each individual layer, but the ability of such paradigm to handle an error-prone physical medium is severely compromised in wireless networks. Several approaches, including cross-layer techniques, have been developed to address this problem. While much cross-layer research endeavour focused on interactions of the lower layers, in this paper, we present a cross-layer technique that involves the transport and MAC layers. In particular, our approach allows the MAC layer of a WiMAX network to be made aware of the network congestion condition perceived by TCP at the transport layer. This cross-layer technique allows the scarce radio resource to be distributed in a more intelligent fashion among the stations in the network. More specifically, our resource allocation scheme at the MAC layer adapts to the congestion window sizes passed down from TCP. We have developed analytical and simulation models to understand the dynamics of the proposed technique and quantify the resulting performance gains. Our results show that our proposed algorithm delivers a better performance in average end-to-end delay, file download time, and throughput when the traffic intensity of the network is moderate to high.
Two-step backup mechanism for real-time main memory database recovery (2002)

Proposes a recovery mechanism for real-time main-memory database systems (RT-MMDBSs) which aims at reducing the system recovery time, as well as ensuring a fast response time and predictability. Conventional main-memory database (MMDB) recovery schemes usually use logging with checkpointing, which involves many disk I/Os during transaction processing. Consequently, it not only ensures the predictability of the response time, but also fast recovery, because undo/redo logs should be analyzed and applied after failure. Our recovery mechanism replaces logging and checkpointing activities with a single backup activity, which results in eliminating the need for log writing. Furthermore, it performs transaction processing and backup processing in separate areas, as a result minimizing their interference with each other. We use part of the main memory as a shadow memory area and the stable memory as a backup buffer. In our scheme, a two-step page-based backup is made: the first backup step is done from the shadow memory to the backup buffer, and the second step is performed from the backup buffer to a backup disk. We briefly show the worst-case performance analysis of our mechanism.
A 820GHz SiGe chipset for terahertz active imaging applications (2011)

In this paper, recent advances in SiGe HBT device technology are used to demonstrate a 820GHz TX/RX chipset for active terahertz imaging applications.
Dynamic Interactions in Physically Realistic Collaborative Virtual Environments (2005)

This work describes our efforts in creating a general object interaction framework for dynamic collaborative virtual environments. Furthermore, we increase the realism of the interactive world by using a rigid body simulator to calculate all actor and object movements. The main idea behind our interactive platform is to construct a virtual world using only objects that contain their own interaction information. As a result, the object interactions are application independent and only a single scheme is required to handle all interactions in the virtual world. In order to have more dynamic interactions, we also created a new and efficient way for human users to dynamically interact within virtual worlds through their avatar. In particular, we show how inverse kinematics can be used to increase the interaction possibilities and realism in collaborative virtual environments. This results in a higher feeling of presence for connected users and allows for easy, on-the-fly creation of new interactions. For the distribution of both the interactive objects and the dynamic avatar interactions, we keep the network load as low as possible. To demonstrate the effectiveness of our techniques, we incorporate them into an existing CVE framework.
PO: an object model to express parallelism (1988)

The object paradigm has many pleasant properties such as uniformity, factorization and dynamicity. As opposed to the actor paradigm The need to extend the semantics of objects to accommodate parallelism In particular, investigation of the assumptions that connect objects with parallelism is fruitful. Two different solutions may lead to parallelism: i) objects are mostly passive and processes "execute through" them; ii) parallelism is closely tied to the concept of object.
Compact low-voltage PTAT-current source and bandgap-reference circuits (1998)

A compact PTAT current source is described that can operate on supply voltages down to 1.3V does not need a compensation capacitor and achieves good supply rejection. The PTAT circuit is used to implement several band-gap-reference circuits. In addition, bandgap circuits based on conventional PTAT sources are designed as a reference. The circuits have been implemented in a 1-µm BiCMOS process.
Scanning the issue (1983)

Provides an overview of the technical articles and features presented in this issue.
Anoctamin 6 is an essential component of the outwardly rectifying chloride channel (2011)

Outwardly rectifying chloride channels (ORCC, ICOR) of intermediate single-channel conductance of around 50 pS, are ubiquitously expressed, but have remained a mystery since their description more than 25 y ago. These channels have been shown to be activated on membrane excision and depolarization of the membrane voltage and by cAMP in the presence of the cystic fibrosis transmembrane conductance regulator. We show that anoctamin 6 (Ano6), a member of the recently identified family of putative Cl(-) channels, is the crucial component of ORCC single-channel and whole-cell currents in airway epithelial cells and Jurkat T lymphocytes. Cystic fibrosis transmembrane conductance regulator augmented ORCC produced by Ano6 in A549 airway epithelial cells. Ano6 is activated during membrane depolarization or apoptosis of Jurkat T lymphocytes and epithelial cells, and is inhibited by 5-nitro-2-(3-phenylpropylamino) benzoic acid, 4,4'-diisothio-cyanostilbene-2,2'-disulfonic acid, or AO1. Ano6 belongs to the basic equipment of any cell type, including colonic surface epithelial cells. It forms the essential component of ORCC and seems to have a role for cell shrinkage and programmed cell death.