gebhart/patrepeval huggingface dataset:
Spatio-temporal video search using the object based video representation (2002)

Object-based video representation provides great promises for new search and editing functionalities. Feature regions in video sequences are automatically segmented, tracked, and grouped to form the basis for content-based video search and higher levels of abstraction. We present a new system for video object segmentation and tracking using feature fusion and region grouping. We also present efficient techniques for spatio-temporal video query based on the automatically segmented video objects.
K-edge and mirror filtered X-ray grating interferometers (2012)

Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Dan Stutman, Michael Finkenthal; K-edge and mirror filtered X-ray grating interferometers. AIP Conference Proceedings 31 July 2012; 1466 (1): 229–236. https://doi.org/10.1063/1.4742297 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAIP Publishing PortfolioAIP Conference Proceedings Search Advanced Search |Citation Search
Improved Robust PCA using low-rank denoising with optimal singular value shrinkage (2014)

We study the robust PCA problem of reliably recovering a low-rank signal matrix from a signal-plus-noise-plus-outliers matrix. We analytically characterize the extent to which the singular vectors of the signal-plus-noise-plus-outliers matrix can be degraded by outliers and discuss why a recently proposed method for robust PCA that exploits outlier sparsity to improve low-rank estimation will produce suboptimal low-rank matrix estimates in the presence of noise. Next, we propose a new iterative algorithm for robust PCA that utilizes an optimal, data-driven low-rank matrix estimator (OptShrink). Finally, we show that the proposed approach yields superior background subtraction on a computer vision dataset.
A Process for Evaluating Exploration Prospects (1997)

In 1989, Chevron Overseas Petroleum, Inc., developed a process to allow management to compare a wide variety of global exploration opportunities on a uniform and consistent basis. Over the next five years, the process evolved into an effective method to plan exploration programs on a basis of value incorporating prospect ranking, budget allocation, and technology management. The final product is a continuous process and includes, within a single organizational unit, the integration of geologic risk assessment, probabilistic distribution of prospect hydrocarbon volumes, engineering development planning, and prospect economics. The process is based on the concepts of the play and hydrocarbon system. Other steps of the process (geologic risk assessment, volumetric estimation, engineering support, economic evaluation, and postdrill feedback) are considered extensions of fundamental knowledge and understanding of the underlying geological, engineering, and fiscal constraints imposed by these concepts. A foundation is set, describing the geologic framework and the prospect in terms of the play concept-source, reservoir, trap (including seal), and dynamics (timing/migration). The information and data from this description become the basis for subsquent steps in the process. Risk assessment assigns a probability of success to each of these four elements of the play concept, and multiplication of ©Copyright 1997. The American Association of Petroleum Geologists. All rights reserved.1Manuscript received February 16, 1996; revised manuscript received September 26, 1996; final acceptance February 4, 1997. 2Chevron Overseas Petroleum, Inc., P.O. Box 5046, San Ramon, California 94583-0946. We acknowledge the champion of this process, M. W. Boyce, without whose continuing, senior-management support this process would not have been possible. We acknowledge the pioneering efforts of C. L. Aguilera, G. A. Demaison, E. J. Durrer, F. R. Johnson, W. E. Perkins, J. L. Reich, and R. A. Seltzer, who established the framework for the process in its early stages. We also acknowledge the efforts to refine, document, and teach the process during the later stages by S. D. Adams, A. O. Akinpelu, G. A. Ankenbauer, G. L. Bliss, T. J. Humphrey, E. McLean, and D. B. Wallem. Finally, we acknowledge all the people who, over the past several decades, have championed such a process, but fell victim to deaf ears because of high oil prices or dumb luck. These people provided the well-founded basis for the theoretical and practical application of evaluation principles. We also wish to extend special thanks to Gerard Demaison and Erwin Durrer for their continuous support, guidance, and friendship.
Chemical approaches to synthetic polymer surface biofunctionalization for targeted cell adhesion using small binding motifs (2012)

In the present review the principal strategies to chemically modify the surface of synthetic polymeric materials with small molecules for targeted cell adhesion are collated and critically discussed. The focus is purposely oriented on the chemistry involved in these modifications and neither the physical characterizations nor the activity evaluations resulting from these modifications are addressed in depth, although most reviewed examples demonstrate cell adhesion. Particularly, the introduction of a chemical anchor onto the polymeric substrate, the spacing via a linker between the polymer surface and the cell-binding motif, as well as the linkage generated on this cell-binding motif are discussed. Particular cases where variable substrate geometries or spatial patterning are achieved are additionally highlighted.
The use of leak-off tests as means of predicting minimum <i>in-situ</i> stress (2002)

Leak-off tests (LOTs) or, preferably, extended leak-off tests (XLOTs), can be successfully used in minimum in-situ stress, S 3 , estimations. Selecting a point on the leak-off graph that represents the best proxy for S 3 can reduce inaccuracies in the use of LOTs as a means of determining S 3 . If the testing procedure is well conducted and recorded, picking the leak-off pressure (LOP) or instantaneous shut-in pressure (ISIP) gives equally valid estimates of S 3 . During testing, most of the pressure applied in the deduction of S 3 is exerted by the static mud column, particularly in overpressured settings where higher drilling mud weights are used. Since the mud column contributes such a large proportion of the applied pressure, estimating S 3 from tests conducted at greater depth means the observed small difference between LOP and ISIP has even less of an effect on the deduced S 3 value. The data used in this study show that LOP closely matches ISIP when considering multiple cycle XLOTs. It can therefore be inferred that the LOP is the fracture re-opening pressure and hence S h given that the assumptions made by the Kirsch equation for wellbore failure are upheld. This study also considers the implications for calculating the magnitude of S H .
Unidades morfopedológicas da microbacia do Ribeirão Ãgua da Cachoeira (Paraguaçu Paulista.SP) e sua relação com o grau e os tipos de erosão do solo / Soil landscapes and its relationships with soil erosion classes of "Ãgua da Cachoeira" watershed ........ (2001)

Objetivou-se mapear zonas homogeneas relacionadas as caracteristicas dos solos e relevo quanto aos processos erosivos na microbacia do Ribeirão Ãgua da Cachoeira, através da fotointerpretação e trabalhos de campo. .l..............
Cryogenic cathodoluminescence of plasma-deposited polycrystalline diamond coatings (1990)

The cathodoluminescence spectra of microwave plasma-deposited polycrystalline diamond films have been measured at liquid-nitrogen temperatures over the spectral region of 230–800 nm. The diamond coatings had been deposited under several different deposition temperatures and reactant compositions. Measurements on natural type-IIB diamond crystals were made for comparison. The intrinsic exciton emission bands which fall in the UV just below the band edge were observed, as well as several defect and impurity bands which extend throughout the visible part of the spectrum. SEM micrographs and Raman spectra were obtained for the same set of samples used for the cathodoluminescence measurements. It was found that the diamond-related cathodoluminescence features were most intense in samples whose Raman spectra exhibited the most intense cubic diamond line at 1332 cm−1 and the least intense graphitic band at about 1500 cm−1.
Slew-Rate Monitoring Circuit for On-Chip Process Variation Detection (2012)

The need for efficient and accurate detection schemes to assess the impact of process variations on the parametric yield of integrated circuits has increased in the nanometer design era. In this paper, the difference of rise and fall slew is presented as another process-variation metric along with the delay in determining the relative mismatch between the drive strengths of nMOS and pMOS devices. The importance of considering both of these metrics is illustrated, and a new slew-rate monitoring circuit is presented for measuring the difference of rise and fall slew of a signal on the critical path of a circuit. Sensitivity analysis with multiple pulses as input has also been investigated. Bias generator circuits that track nMOS and pMOS threshold voltages have been incorporated, which makes the design less susceptible to process variation. Design considerations, simulation results, and characteristics of the slew-rate monitor circuitry in a 65-nm IBM CMOS process are presented, and a sensitivity of 50 MHz/50 ps for single pulse input is achieved. The measurement sensitivity of a fabricated slew-rate monitor in a 65-nm IBM CMOS technology is 0.11 V/μs, with 1089 pF as the output load of the slew-rate monitor.
The National Optical Astronomy Observatories 1-5 Micron Imaging Camera: A New National Resource (1988)

The NOAO infrared camera was designed for use with the Santa Barbara Research Center (SBRC) 58x62 indium antimonide photovoltaic hybrid array, a device which is sensitive over the spectral range 1-5 microns. There are two versions of the camera design, one of which uses either reflective or transmissive optics, the other only transmissive optics. Both cameras utilize a LN2 radiation shield and cool the detector to the mid 30K region with LHe. The electronics consist of a preamplifier inside the dewar, signal processing electronics, clock drivers, and a digital control unit which generates timing pulses and controls the link to the host computer. These cameras were developed by NOAO in Tucson and are now available for general visitor use at the Kitt Peak National Observatory in Tucson and the Cerro Tololo Inter-American Observatory in Chile.
Research on autonomous high-precision time synchronization method of UAVs based on side-tone signal (2017)

Based on the existing communication links between UAVs, a short wave side tone ranging signal for UAV platform is constructed, based on the phase characteristic of side tone signal and the principle of bidirectional time comparison, this paper proposed a high-precision time synchronization method which can achieve the high-precision time synchronization for formation UAVs independently without GNSS navigation system and ground control station. The simulation results show that the synchronization accuracy can reach μs level for formation UAVs in the autonomous mode.
Fluid Dynamics of Radial-Flow Ion Exchange in Partially Filled Columns (2000)

An experimental and numerical study demonstrated that completely filling the resin bed is essential if a radial-flow ion-exchange column is to work properly. The first phase of the study developed and verified a finite-element model of both an infinitely long column and finite-height column that was completely filled with resin. The porosity and tortuosity of the support columns of the ion-exchange column were calculated using a least-squares analysis of experimental pressure drop versus flow rate data in an empty column in conjunction with a theoretical analysis based on a layered-cylinder model. Numerical analysis of a partially filled column (i.e., one in which the top 2% of the resin bed was empty headspace) demonstrated that approximately 9% of the fluid would flow through the headspace. This fluid would never come in contact with the ion-exchange resin and would thus leave the column untreated. Modifying the column so that the top 10% of the support membranes was impermeable changed the flow lines such that the headspace was filled with a stagnant fluid and that, after this space was filled, all subsequent fluid entering the column flowed through the ion-exchange bed. This provides a method in which one could ensure that all the fluid would flow through the ion-exchange resin and be treated even if the column could not be or was not completely filled.
Antimicrobial/Antimold Polymer-Grafted Starches for Recycled Cellulose Fibers (2010)

In this work, an antimicrobial guanidine polymer (PHGH) was grafted onto starch as a carrier to form branched or grafted chains along the starch backbone. This grafting improved the antimicrobial properties and the adsorption of the starch on recycled cellulose fibers. Similar work was also conducted on bleached sulfite fibers for comparison. The results showed that the starch, grafted with 12 wt% PHGH, adsorbed more on recycled fibers than on sulfite fibers. By applying the antimicrobial-modified starch to recycled or sulfite pulps up to 20 mg/g, both antimicrobial and antimold performances of the papers were improved substantially. Additionally, the PHGH-modified starch increased the tensile index of papers, but decreased the tear index slightly. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) were employed to investigate the morphologic changes of Escherichia coli bacteria and Chaetomium globosum fungi upon exposure to the PHGH-modified starch, thus demonstrating that the antimicrobial mechanism is based on the damage of bacterial membrane.
Direct optical processing of M-ary code-shift keyed OCDMA using integrated passive optical phase decoders (2006)

Optical signal processing using composite spectral-phase masks permits direct detection of each bit of an M-ary codeword. The demonstrated M-ary receiver requires only log <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> (M) rather than M parallel stages and eliminates the usual electronic post-processing.
[Difficulties and errors in diagnosis and treatment of closed trauma to the abdominal organs]. (1993)

A critical analysis of the difficulties and errors in the diagnosis and treatment of closed injuries to the abdominal organs during a period of 30 years is given. In the first period (1960-72) diagnostic laparotomy was applied widely in all questionable cases, which in 32 out of 252 (12.7%) patients failed to reveal injuries to the viscera, but aggravated the general condition and promoted a fatal outcome in some patients. Because of diagnostic doubts, 38 (15%) patients were kept under observation at the clinic for 6 to 48 hours; in 29 of them the operation was delayed, nine patients did not undergo surgery and injury to the abdominal organs was recognized only on postmortem examination. Total mortality was 32.1% (17.5% in isolated injury and 62.9% in concomitant injuries). During the second period (1973-89) 349 patients with similar injuries were under observation. With the wide use of laparocentesis and, less frequently, laparoscopy in diagnostic difficulties, the number of explorative laparotomies reduced to 2.8%, the time for establishing the diagnosis was shortened to 30-60 minutes, an authentic diagnosis was made in 96% of patients, and mortality decreased by 9% due to timely operation (it was 8.5% in isolated and 44.8% in concomitant injuries). The author points out that the results of laparocentesis and laparoscopy may be pseudonegative in some cases, which may lead to serious diagnostic and tactical errors. Similar errors were made in 30 (5%) patients during the operation itself because the main rules of examination of the abdominal cavity were not observed.
Two-qubit gate based on a multiterminal double-barrier Josephson junction (2006)

A multiterminal double-barrier SISIS junction (S and I denote a superconductor and an insulating barrier, respectively) is suggested as a two-qubit gate with tunable intrinsic coupling. Two quantum wells are formed in the vicinities of the left and right SIS subjunctions. This gives two individual qubits, which are intrinsically coupled via the middle S layer due to phase coherence. The interqubit coupling $J$ is tuned by two bias supercurrents ${I}_{1}$ and ${I}_{2}$ across each of the SIS subjunctions independently. Additional coupling is accomplished by transport supercurrents ${I}_{l}^{\mathrm{tr}}$ along adjacent S layers. Using a microscopic model we compute major qubit characteristics and study sources of the intrinsic decoherence. We compute the entanglement of the two-qubit states, leakage and fidelity characteristics versus $J$, and discuss the readout process.
Multiband Carrierless Amplitude Phase Modulation for High Capacity Optical Data Links (2013)

Short range optical data links are experiencing bandwidth limitations making it very challenging to cope with the growing data transmission capacity demands. Parallel optics appears as a valid short-term solution. It is, however, not a viable solution in the long-term because of its complex optical packaging. Therefore, increasing effort is now put into the possibility of exploiting higher order modulation formats with increased spectral efficiency and reduced optical transceiver complexity. As these type of links are based on intensity modulation and direct detection, modulation formats relying on optical coherent detection can not be straight forwardly employed. As an alternative and more viable solution, this paper proposes the use of carrierless amplitude phase (CAP) in a novel multiband approach (MultiCAP) that achieves record spectral efficiency, increases tolerance towards dispersion and bandwidth limitations, and reduces the complexity of the transceiver. We report on numerical simulations and experimental demonstrations with capacity beyond 100 Gb/s transmission using a single externally modulated laser. In addition, an extensive comparison with conventional CAP is also provided. The reported experiment uses MultiCAP to achieve 102.4 Gb/s transmission, corresponding to a data payload of 95.2 Gb/s error free transmission by using a 7% forward error correction code. The signal is successfully recovered after 15 km of standard single mode fiber in a system limited by a 3 dB bandwidth of 14 GHz.
Improved HomePlug AV channel estimation exploiting sounding procedure (2009)

In this paper we investigate channel estimation in the context of the OFDM-based HomePlug AV system using the OPERA power-line channel models. In particular, the proposed channel estimation exploits the sounding procedure available in HomePlug AV, by averaging the estimates of the channel collected during several received frames. To allow the channel estimation to properly work also in the case of a non ideal frame synchronization, a method to estimate the frame synchronization offset between successive frames is presented. Numerical results, in terms of BER versus signal-to-noise ratio, show that the performance of the proposed channel estimation almost overlaps the performance achieved with perfect channel knowledge.
Thermocompression Bondability of Bare Copper Leads (1978)

Thermocompression bondability of bare (unplated) Cu leads to TiPdAu ~ms on alumina substrates was investigated. This is an extension of earlier work to reduce the Au-plating thickness on Cu leads. Initial bondability, prebond shelf life, and long-term reliability were evaluated. The results follow. 1) Initial bondability is satisfactory provided suitable bond deformation is used. 2) Prebond shelf life is described by t(SL) = 7.5 X 10'-10 exp (0.80 + 0.2 eV/kT) where t(SL) is the time in hours to unacceptable bondability. The mechanism causing loss of bondability is surface oxidation of the Cu leads. A prebond shelf life (without recleaning) of about two years is indicated for storage at room temperature. 3) Long-term reliability is described by t(LT) = 9.7 x 10-'10 exp (1.0 0.2 eV/kT) where t(LT) is the time in hours to unacceptable bond strengths. The mechanism causing loss of bond strength with time is believed to be interdiffusion of the Cu lead with the Au metallization. A lifetime of greater than 40 years at 50°C is predicted. Comparisons between the present findings for hare Cu leads and those previously obtained using Au-plated Cu leads are presented. They indicate that the bare Cu leads have less processing and safety margin. But for many applications, bare Cu leads should be acceptable.
Agent Base Network Traffic Monitoring (2013)

Raspberry Pi the credit-card-sized single board computer device which adopts a high performance embedded microprocessor and an embedded real-time Linux operating system, which hangs the characteristics of miniaturization, digitalization and network together well. It has virtues of low cost, small volume and flexible networking, etc, because of embedded technology adoption. Network administrators need to see whatâs going on with their network. They need to know what the traffic on their network is comprised of, who's using the bandwidth, and how their infrastructure is handling the load. Fortunately, Linux runs a wide variety of free, open source network monitoring and traffic analysis applications that can give net administrator this type of insight. So this paper focuses on how to deploy network monitoring tool within this device which monitors the network traffic within LAN using the tool ntop. Ntop is a simple, free, portable traffic measurement and monitoring tool, which supports various management activities, including network optimization and to plan, and detection of network security violations.
Interrelations among Early Vigor, Flowering Time, Physiological Maturity, and Grain Yield in Tropical Maize (<i>Zea mays</i> L.) under Multiple Abiotic Stresses (2016)

We studied the interrelation among time to anthesis, physiological maturity, and grain yield in tropical maize ( Zea mays L.) facing terminal drought and nitrogen deficiency. Sixty‐one hybrids were grown under optimum, nitrogen‐deficient (LN), and drought‐stressed (DS) conditions. Grain yield was negatively correlated with time to anthesis under DS ( r = −0.4*) and positively correlated with the grain‐filling period (optimum: r = 0.54**; LN: r = 0.61***; DS: r = 0.69***) across treatments. These results suggest that coselecting for grain yield, early anthesis, and a long grain‐filling period within a maturity group could help increase grain yield. A second experiment involving eight hybrids contrasting for grain yield and time to anthesis was conducted under similar stresses to identify secondary traits associated with grain yield and time to physiological maturity: early vigor (measured as normalized differential vegetation index) correlated with grain yield under optimum ( r = 0.77*) and LN conditions ( r = 0.72*). Time to physiological maturity was associated with senescence across treatments (optimum: r = −0.97***; LN: r = −0.82*; DS: r = −0.81*), making senescence suitable to approximate physiological maturity. Repeatability for secondary traits ( r 2 = 0.79 on average) was higher than for grain yield ( r 2 = 0.68) across treatments. In light of the association of these traits with grain yield and their high repeatability, grain yield could be increased within a maturity group by simultaneously selecting for high normalized differential vegetation index during vegetative growth and early anthesis and low senescence during grain filling, in addition to grain yield.