gebhart/patrepeval huggingface dataset:
Inter-Frame Differences and Convolution Neural Network based Abnormal Crowd Event Recognition (2018)

Surveillance video based abnormal crowd event recognition has important practical significance in public safety management. Traditional methods usually based on modeling and analysis of certain feature modes, and the performances are quite sensitive to the features adopted. However, there are many kinds of event to be recognized and many features can be used, how to find the most effective features to distinguish a certain kind of event is quite a difficult problem to solve. Convolutional Neural Network has the characteristics of simple structure, less training parameters and strong adaptability. It can learn effective features and then establish corresponding models automatically from a large number of training data. In this paper, a crowd event recognition algorithm was proposed based on inter-frame differences and convolutional neural network. Where the inter-frame difference is used to extract the most original motion characteristics of the crowd video, then to be selected by a LeNet-5 based network to get the most effective ones. Where the LeNet-5 model was improved redesigned for crowd video analysis and events recognition. The performance of the proposed algorithm was evaluated by dataset PETS 2009 The results show that the recognition accuracy of the proposed algorithm reaches over 96%, which is much higher than the traditional feature model based methods, as well as better robustness in different views.
Practical implementation of a highly sensitive receiver using an erbium-doped fiber preamplifier (1991)

A practical erbium-doped fiber preamplified direct detection receiver is demonstrated with which receiver input sensitivities of -46.5 dBm at 622 Mb/s and -40.7 dBm at 2.3 Gb/s have been achieved. There is no penalty from the transmission fiber Rayleigh backscattering. The bit error ratio measurements with 2/sup 23/-1 NRZ PRBS (pseudorandom bit sequence) show highly stable characteristics with no apparent error floor, owing to the polarization insensitivity of the preamplifier and to an active locking of the receiver optical filter. The tradeoff between preamplifier and avalanche gain is shown, and the influence of optical filter bandwidth and decision threshold setting is measured.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
A Probe for Measuring Temperature in Radio-Frequency-Heated Material (Short Papers) (1976)

Measuring temperature in material being heated by radio-frequency (RF) fields is difficult because of field perturbations and direct heating caused by any conventional leads connected to the temperature sensor. A temperature probe consisting simply of a thermistor and plastic high-resistance leads appears to practically eliminate these problems. The design goals are described, and the performance of an initial test model of this type of probe is discussed.
Synthesis and Properties of Diamino-Substituted Dipyrido [3,2-<i>a</i>: 2′,3′-<i>c</i>]phenazine (1992)

Abstract A heteroaromatic compound 3,6-diaminodipyrido[3,2-a: 2′,3′-c]phenazine was synthesized with an improved method to convert 1,10-phenanthroline derivatives to the corresponding 5,6-diones. It was shown that the electron-donating effects of amino substituents were extended not only to pyridine rings but also to the phenazine ring.
Effect of compressive straining on corrosion resistance of a shape memory(Ni-Ti alloy in ringer's solution (1996)

The effect of various degrees of deformation was investigated at specific locations in the stress-strain curve under compression on the corrosion resistance of a wrought Ni-Ti alloy with a martensite to austenite transformation peak of 110 degrees C. Two metallurgical conditions were evaluated: 30% cold drawn and annealed at 900 degrees C for 1 h. The cold drawn material was tested for corrosion resistance after 5.8, 7.4, 12.2, and 24.5% applied strain. Similarly, the corrosion resistance of the annealed material condition was examined after deformation in compression to 11.9, 22.3, and 24.4% strain. Tafel extrapolation and cyclic polarization tests were used for corrosion characterization of each alloy condition. It was found that the corrosion current density undergoes a significant reduction while the breakdown potential improves at increasing strains. In particular, the alloy in the annealed condition exhibited breakdown potentials above 1000 mV with current densities lower than 10 microA cm-2 when it was strained to 24.4%.
50 W thin-disk laser with variable pulse duration (2011)

The laser system is based on an Yb:YAG thin-disk regenerative amplifier, which is operated in different operation modes
in order to address broad spectrum of pulse durations. It is especially interesting for application development tasks, when
different pulse durations can be tested to find the application optimum. For sub-picosecond pulse duration the dispersion
of the regenerative amplifier output is compensated with a pair of diffraction gratings. Pulses with a full width at half
maximum of 334 fs at an output power level of 30 W can be produced using a nonlinear spectrum broadening during
amplification. Tuning of the distance between gratings or abandoning of the compressor allows for output pulse
durations of several picoseconds with an output power of 60 W. A second seed source allows for pulse durations up to
several nanoseconds. Further, the amplifier was operated in cavity-dumped or in Q-switched mode just by changing of
the electrical control of the Pockels cell in the amplifier. The pulse durations range is extended, correspondingly, to 100
ns and even to microseconds.
MASSIVE PIPELINE TO CARRY BOLIVIAN GAS INTO BRAZIL (1997)

Peter Weidler, president of Transredes S.A. discusses the pending construction of the $2 billion, 3,000 kilometers (1,875 miles) Bolivia to Brazil natural gas project.
Analysis of pulse thermography using similarities between wave and diffusion propagation (2017)

Pulse thermography or thermal wave imaging are commonly used as nondestructive evaluation (NDE) method. While the technical aspect has evolve with time, theoretical interpretation is lagging. Interpretation is still using curved fitting on a log log scale. A new approach based directly on the governing differential equation is introduced. By using relationships between wave propagation and the diffusive propagation of thermal excitation, it is shown that one can transform from solutions in one type of propagation to the other. The method is based on the similarities between the Laplace transforms of the diffusion equation and the wave equation. For diffusive propagation we have the Laplace variable <i>s</i> to the first power, while for the wave propagation similar equations occur with s<sup>2</sup>. For discrete time the transformation between the domains is performed by multiplying the temperature data vector by a matrix. The transform is local. The performance of the techniques is tested on synthetic data. The application of common back projection techniques used in the processing of wave data is also demonstrated. The combined use of the transform and back projection makes it possible to improve both depth and lateral resolution of transient thermography.
The birefringence problem in optical disk substrates: A modeling approach (1989)

Abstract An analytical model has been constructed to predict the birefringence level in an injuection‐molded disk with direct application to optical disk substrates. The model incorporates simplified analyses for the flow in a center‐gated cavity during the filling stage, the heat transfer during the cooling stage, and the stress relaxation following the cessation of flow at the end of the filling stage of the injection‐molding cycle. The stress relaxation process is analyzed with the integral constitutive equation of Wagner and the residual stresses are converted to retardation via the stress‐optical law. Predictions of normal retardation profiles are in line with experimental data and the general effects of melt temperature, mold temperature, and injection speed are closely captured by the model. By contrast, the observed transverse retardation is not in accord with the predicted response. This discrepancy is attributed to the fact that the transverse retardation is induced by cooling stresses and thus cannot be explained in terms of a flow stress mechanism employed in the present analysis.
Security Enhancing of Authentication Protocol for Hash Based RFID Tag (2010)

본 논문에서는 해쉬 기반 RFID 태그를 위한 보안성이 향상된 인증 프로토콜을 제안하고, 제안한 인증 프로토콜 기반으로 한 RFID 태그의 디지털 코덱을 설계한다. 제안한 프로토콜은 태그와 back-end 서버 사이에서 3-way 질의 응답 인증 프로토콜을 기본으로 하고 있으며, 안전한 인증 메커니즘을 구현하기 위해, ISO/IEC 18000-3 표준에서 규정된 3가지 타입의 프로토콜 패킷을 개선된 형태로 수정한다. 제안한 방법은 Man-in-the-middle과 Replay attacks과 같은 능동 공격의 방어에 특히 유효하다. 제안된 프로토콜의 효과를 검증하기 위하여 RFID 태그에서의 디지털 코덱은 Verilog HDL을 사용하여 설계하였고 Hynix 0.25 ㎛ standard-cell library을 갖춘 Synopsys Design Compiler을 이용하여 합성하였다. 보안 분석 및 실험결과를 통해, 본 논문에서 제안된 방법이 사용자의 데이터 보안, 태그 익명성, Man-in-the-middle attack 예방, replay attack, 위조방지 및 위치 추적 등에서 성능이 개선됨을 보였다.
A strong local consistency for constraint satisfaction (2003)

Filtering techniques are essential for efficient solution searching in a constraint network (CN). However, for a long time, it has been considered that to efficiently reduce the search space, the best choice is the limited local consistency achieved by forward checking. However, more recently, it has been shown that maintaining arc consistency (which is a more pruningful local consistency) during searching outperforms forward checking on hard and large constraint networks. In this paper, we show that maintaining a local consistency which is stronger than arc consistency during searching can be advantageous. According to a comparison of local consistencies that are more pruningful than the arc consistency which can be used on large CNs, max-restricted path consistency (Max-RPC) is one of the most promising local consistencies. We propose a new local consistency, called Max-RPCEn (Max-RPC Enhanced), that is stronger than Max-RPC and that has almost the same CPU time requirements.
Catalysis by molybdenum complexes. The reaction of diazenes and acetylenes with thiophenol (1976)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalysis by molybdenum complexes. The reaction of diazenes and acetylenes with thiophenolJ. W. McDonald, J. L. Corbin, and W. E. NewtonCite this: Inorg. Chem. 1976, 15, 9, 2056–2061Publication Date (Print):September 1, 1976Publication History Published online1 May 2002Published inissue 1 September 1976https://pubs.acs.org/doi/10.1021/ic50163a009https://doi.org/10.1021/ic50163a009research-articleACS PublicationsRequest reuse permissionsArticle Views319Altmetric-Citations38LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts
Role of a Heterotrimeric G Protein in Regulation of Arabidopsis Seed Germination (2002)

Seed germination is regulated by many signals. We investigated the possible involvement of a heterotrimeric G protein complex in this signal regulation. Seeds that carry a protein null mutation in the gene encoding the alpha subunit of the G protein in Arabidopsis (GPA1) are 100-fold less responsive to gibberellic acid (GA), have increased sensitivity to high levels of Glc, and have a near-wild-type germination response to abscisic acid and ethylene, indicating that GPA1 does not directly couple these signals in germination control. Seeds ectopically expressing GPA1 are at least a million-fold more responsive to GA, yet still require GA for germination. We conclude that the GPA1 indirectly operates on the GA pathway to control germination by potentiation. We propose that this potentiation is directly mediated by brassinosteroids (BR) because the BR response and synthesis mutants, bri1-5 and det2-1, respectively, share the same GA sensitivity as gpa1 seeds. Furthermore, gpa1 seeds are completely insensitive to brassinolide rescue of germination when the level of GA in seeds is reduced. A lack of BR responsiveness is also apparent in gpa1 roots and hypocotyls suggesting that BR signal transduction is likely coupled by a heterotrimeric G protein at various points in plant development.
Prevention of air emboli in hip surgery (1982)

A study is described in which clinically detectable air emboli which occurred during total hip replacement were eliminated by flushing the femoral shaft cavity with carbon dioxide. Transient falls in blood pressure were still observed immediately after insertion of bone cement, and alternative mechanisms are discussed.
MQTT-ST: a Spanning Tree Protocol for Distributed MQTT Brokers (2020)

MQTT, one of the most popular protocols for the IoT, works according to a publish/subscribe pattern in which multiple clients connect to a single broker, generally hosted in the cloud. However, such a centralised approach does not scale well considering the massive numbers of IoT devices forecasted in the next future, thus calling for distributed solutions in which multiple brokers cooperate together. Indeed, distributed brokers can be moved from traditional cloud-based infrastructure to the edge of the network (as it is envisioned by the upcoming MEC technology of 5G cellular networks), with clear improvements in terms of latency, for example. This paper proposes MQTT-ST, a protocol able to create such a distributed architecture of brokers, organised through a spanning tree. The protocol uses in-band signalling (i.e., reuses MQTT primitives for the control messages) and allows for full message replication among brokers, as well as robustness against failures. We tested MQTT-ST in different experimental scenarios and we released it as open-source project to allow for reproducible research.
A transconductor-based field-programmable analog array (2002)

Field-programmable gate arrays for prototyping digital circuits are a widely endorsed approach for reducing time-to-market. Offering similar advantages, a field-programmable analog array (FPAA) for prototyping continuous-time analog circuits is reported here. Conceptually, a FPAA consists of configurable analog blocks (CABs) and interconnects. The function of each CAB and the connections among CABs are determined by the contents of an on-chip shift register. Different circuits can be instantiated using a FPAA by loading in different configuration bits. This IC strategy offers simplified analog circuit design with the advantages of instant prototyping, programmable topology, programmable parameters, CAD compatibility, and testability.
ChemInform Abstract: Biomimetic Synthesis of Monoterpenoid Indole Alkaloids from Aglucones of Secologanin Derivatives: pH‐Controlled Product Selectivity. (2002)

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Intravenous Injection of Coronavirus Disease 2019 (COVID-19) mRNA Vaccine Can Induce Acute Myopericarditis in Mouse Model (2021)

This study provided in vivo evidence that inadvertent intravenous injection of COVID-19 mRNA vaccines may induce myopericarditis. Brief withdrawal of syringe plunger to exclude blood aspiration may be one possible way to reduce such risk.
Performance investigation of organic photovoltaic layers on architectural membrane (2014)

Organic Photovoltaic (OPV) is a promising alternative to established crystalline silicon technologies due\nto its expected easy fabrication and low capital cost investments. Current OPV are typically manufactured\nby depositing active materials on plastic substrates like Polyethylene terephthalate (PET) or Polyethylene\nnaphthalate (PEN). In spite of the low cost and easy availability of these materials, their inferior performance\nwhen compared with architectural membrane materials like Ethylene tetrafluoroethylene (ETFE) and\nPolytetrafluoroethylene (PTFE) limits their future application in contemporary architectural context.\nMoreover, different layers of the organic Photovoltaic composite will exhibit distinct responses upon\nexternal loads due to their various material properties. Therefore it is important to find out the weakness, its\nfailure mechanism and how this will influence the OPV???s performance out from the different printed OPV\nlayers.\nThis research investigated both the electrical and mechanical properties of Ag based electrodes and\ncharge carrier transporting layer printed on architectural membrane materials, by employing the uniaxial\ntest methodology coupled with electrical characterization. The results report the performance differences\nof the tested layers as printed on either PET or ETFE. The property features revealed by this survey also\nprovide valuable knowledge for future realization of mechanically robust printed OPV in large scale on\narchitectural membranes.
Expansion of Thiele’s Acid Chemistry in Pursuit of a Suite of Conformationally Constrained Scaffolds (2015)

The Diels-Alder dimer of cyclopentadiene carboxylate, Thiele's acid has conformational properties that make it attractive as a molecular scaffold for applications in supramolecular and biological chemistry. However, a lack of known reaction methodology for derivatives of Thiele's acid (or the corresponding esters) has hampered its utilization in these fields. We describe an improved preparation of Thiele's esters and survey the chemistry of these versatile intermediates. As part of this effort, we also describe the synthesis of a suite of Thiele's acid (or ester) analogues spanning a broad range of cleft angles.
Antioxidant Capacity and in Vitro Inhibition of Adipogenesis and Inflammation by Phenolic Extracts of Vaccinium floribundum and Aristotelia chilensis (2010)

Interest in berries from South America has increased due to their potential health benefits. The objective of this study was to characterize the anthocyanins and proanthocyanidins of Vaccinium floribundum and Aristotelia chilensis , total phenolics, and antioxidant capacity and to evaluate, in vitro, the ability of their phenolic extracts to reduce adipogenesis and lipid accumulation in 3T3-L1 adipocytes. The anti-inflammatory property of these extracts on RAW 264.7 macrophages was also investigated. Antioxidant capacity, measured as oxygen radical scavenging capacity and expressed as Trolox equivalents, was higher in the berries of A. chilensis. Phenolic extracts inhibited lipid accumulation by 4.0-10.8% when adipocytes were treated at maturity and by 5.9-37.9% when treated throughout differentiation. Furthermore, a proanthocyanidin-enriched fraction from V. floribundum significantly increased Pref-1 expression in preadipocytes. Phenolic extracts decreased the production of nitric oxide (3.7-25.5%) and prostaglandin E2 (9.1-89.1%) and the expression of inducible nitric oxide synthase (9.8-61.8%) and cycloxygenase-2 (16.6-62.0%) in lipopolysaccharide-stimulated RAW 264.7 macrophages. V. floribundum and A. chilensis phytochemicals limit adipogenesis and inflammatory pathways in vitro, warranting further in vivo studies.
Effects of Relaxation On Anxiety in Children (1985)

Although research shows that relaxation has the potential to reduce stress and anxiety in adults, there is little evidence to support this effect in children. This study examined the effects of relaxation on anxiety in 46 second-grade children in two classrooms. A nonequivalent control group design was strengthened by providing relaxation treatment to the control group after the second measure of anxiety. A third measure of anxiety was then given to both classes. The children were not significantly different with respect to sex, age, and initial anxiety. Although the main hypothesis was not supported (at p less than .05), a reduction in anxiety resulted for both classes after they completed the program. Subgroup analyses showed a significant treatment effect with the group receiving relaxation exhibiting less anxiety than the control group. This finding indicates that relaxation may be learned by children and may be beneficial in coping with stress.
Probing of Carrier Recombination in n- and p-Type 6H-SiC Using Ultrafast Supercontinuum Pulses (2015)

Excess carrier dynamics in 6H-SiC substrates with n - and p -type moderate doping were detected using femtosecond pump-probe measurements with supercontinuum probing. Band-to-band recombination and carrier trapping were determined as the main recombination processes in both materials. Spectral fingerprints corresponding to each of these recombination components were obtained using the global and target analysis. It was shown that, in spite of background doping, the band-to-band recombination in 6H-SiC is dominated by the excess electron absorption component and the carrier trapping is dominated by the excess hole absorption.