gebhart/patrepeval huggingface dataset:
Functional models for space power electronic circuits (1995)

Presented here is a new approach to model power electronic components so that system level issues of large space power systems can be studied. To demonstrate this approach, the models for two major power electronic components in the space station power system are described. The new models are useful not only in system level studies but also in the design/analysis of particular components.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
Efficient transient analysis of nonlinear circuits using Volterra series and piecewise constant interpolation (2002)

An explicit and efficient transient analysis method for nonlinear circuits is presented. The method makes use of Volterra series representation of nonlinear systems and characterizes the behavior of nonlinear circuits in the time domain using a set of linear circuits called Volterra circuits. The input of the first-order Volterra circuit is the same as that of the nonlinear circuits, whereas that of higher-order Volterra circuits is obtained from the response of the lower-order Volterra circuits and piecewise constant interpolation. The response of the nonlinear circuits is computed at equally spaced instants of time. Numerical results on example circuits demonstrate that the accuracy of the method is comparable to that of predictor-corrector algorithms but with greatly improved computational efficiency.
Measuring the Term Structure of Interest Rates (1971)

Estimates a yield curve using a cubic spline approximation to the discount function, as described in McCulloch (1971), Measuring the Term Structure of Interest Rates, Journal of Business, vol 44, pp 19-31.(This abstract was borrowed from another version of this item.)
Analysis of Electro-Meachanical Actuator Systems in More Electric Aircraft Applications (2005)

Conventional hydraulic actuators in aircraft are demanding regarding maintenance which implies high operation costs. In recent years the focus therefore has been set on electro-hydrostatic and electro-mechanical actuators. The aim of this work is to analyze and evaluate the possibility of introducing electro-mechanical actuators (EMAs) in more electric aircraft applications. The major goal is to optimize the weight of such actuator systems including the electro-machine (electric motor) gear mechanism and power converter, without loss of reliability. Other optimisation criteria on such solutions are low losses and good thermal properties. A quasi-static model approach of EMAs is used here in order to decrease the simulation time. It is possible because the low (mechanical) and high (electrical) frequency components are separated in the model, see [1]. The inverters and converters are described as fictive DC-DC transformers with corresponding efficiencies, see [2]. By introducing an object oriented approach the model is flexible and re-usable and can be used as a framework in the future build-up of models of entire MEA aircrafts, see [3]. Power density, cost and weight of the actuator systems are some of the important key factors for comparing purpose and as a platform for the dimensioning of the aircraft. The next issue becomes the scalability of the model and the key factors, because of the diversity of the actuators used in different parts of the MEA aircraft. Therefore the ambition is set to build up a database of different scalable actuator solutions which among others returns these key factors as output.
Amperometric Detection of Carbohydrates by Capillary Electrophoresis with a Cuprous Oxide Modified Sol-Gel Carbon Composite Electrode (2000)

A new sensitive electrochemical detector has been developed for the amperometric detection in capillary electrophoresis (CE). Chemically modified sol-gel carbon composite electrodes (CCEs) containing cuprous oxide exhibit a sensitive electrocatalytic response for the oxidation of carbohydrates. The electrochemical pretreatment at +1.80 V (vs. SCE) for 60 s results in a marked enhancement of the current responses for all sugars examined, compared to the untreated electrode. A sample mixture containing 8 different sugars was separated within 30 min at an optimal constant potential of +0.65 V (vs. SCE). The stability of an electrochemically preanodized Cu2O-CCE was also investigated in CE experiments. The peak current reproducibility with this preanodized electrode over a period of 10 h was within 5 %. Calibration was linear over the concentration range from 2 to 400 µM with the limits of detection for the carbohydrates studied in the range of 0.75–1.3 µM.
Almost perfect autocorrelation sequences (1992)

Almost perfect autocorrelation sequences are defined as complex periodic sequences such that all the out-of-phase autocorrelation coefficients are zero except one. The study is restricted to (-1,+1)-sequences. In this case, such sequences exist only if the period n is a multiple of 4. After setting up theoretical results, several sequences are constructed for every period n multiple of 4 in the range 8<or=n<or=100 except for six special values.<<ETX>>
Isolation and characterization of Faecalibacterium prausnitzii extracellular vesicles (2017)

Introduction: Extracellular vesicles (EVs) contain active biological compounds which play important roles in biological processes. The secretion of EVs is a common phenomenon which occurs in archaea, bacteria and mammalian cells. The secretion of bacterial EVs has been discovered in various species of both Gram-negative and Gram-positive bacteria. Faecalibacterium prausnitzii is one of the commensal bacteria in human intestinal tract which has potentially therapeutic effects by secretion of bioactive compounds. Within the last few years, many investigations have been performed with respect to extracting and obtaining EVs and as a result, there are many methods to isolate and characterize EVs. The aim of this study was to isolate EVs from F. prausnitzii strain A2-165 and to characterize their physico-chemical properties. Methods: EVs were isolated from F. prausnitzii strain A2-165 using ultracentrifugation and filtration. The EVs of bacterium were then characterized by Scanning Electron Microscopy, SDS-PAGE, Bradford assay, NanoDrop and Limulus Amebocyte Lysate (LAL) test. Results: The extracted EVs were confirmed with the shape of vesicles and the sizes ranging from ~ 30 to 250 nm. Total protein concentration of EVs were ~ 3 mg/ml from two methods; Bradford and NanoDrop, respectively. Protein profile pattern of F. prausnitzii-derived EVs ranged from 11 up to 245 kDa. Endotoxin measurement was 2.04 EU/ml. Conclusion: The results of the current study demonstrated that EVs purity and conformation were acceptable. However, further investigations are necessary to elucidate the safety, efficacy, practicality and mechanism of action of this bacterium EVs in clinical practices, especially as vaccine delivery vehicles in the field of vaccine research.
ChemInform Abstract: Highly Efficient Asymmetric Epoxidation of Alkenes with a D<sub>4</sub>‐Symmetric Chiral Dichlororuthenium(IV) Porphyrin Catalyst. (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.
Study on Methods of DNA Extraction from Thallus of Porphyra yezoensis (2007)

DNA from thallus of Porphyra yezoensis was extracted by method of LiCl,SDS,CTAB,High-salt Urea and Plant Genomic DNA Isolation Kit,and the effects of different extraction methods were compared and analyzed.At the same time, the effects of smudge cell methods and differrent sample sizes to extract the genomic DNA of Porphyra yezoensis were discussed.By evaluating purification of DNA, concentration of DNA,and DNA yield,the results indicated that the effect of SDS was better than other methods,and then was LiCl.When SDS was used,the smudge cell by skive with liquid nitrogen had the best effect among these methods.SDS to extract DNA was better than LiCl in small sample.
All-graphene-battery: bridging the gap between supercapacitors and lithium ion batteries (2014)

Herein, we propose an advanced energy-storage system: all-graphene-battery. It operates based on fast surface-reactions in both electrodes, thus delivering a remarkably high power density of 6,450 W kg(-1)(total electrode) while also retaining a high energy density of 225 Wh kg(-1)(total electrode), which is comparable to that of conventional lithium ion battery. The performance and operating mechanism of all-graphene-battery resemble those of both supercapacitors and batteries, thereby blurring the conventional distinction between supercapacitors and batteries. This work demonstrates that the energy storage system made with carbonaceous materials in both the anode and cathode are promising alternative energy-storage devices.
The Effect of Central Neural Adaptation by Neuromuscular Electrical Stimulation (2007)

The purpose of this study was to study for the change of neural adaptation by muscle contraction force when neuromuscular electrical stimulation(NMES) was applied. Sixteen subjects(8 male, 8 female) without neuromuscular disease volunteered to participate in the study. All subjects were divided into two subgroups: control(no electrical stimulation) group, NMES(50% maximal voluntary isometric contraction) group. NMES training program was performed in the calf muscle over three times a week for 12 weeks. Before and after experiment MVIC of ankle plantar flexor was measured by use of dynamometer. H-reflex and V-wave in tibial nerve were measured. The following results were obtained; MVIC and V/Mmax ratio were significantly increased in the electrical stimulation groups. However, H/Mmax ratio was not changed. It was closely relationship between MVIC and V/Mmax ratio. In this study, the effect of neural adaptation of central neural adaptation was found in this study. Accordingly, NMES means not only a change of muscle fiber and skeletal muscle volume but also a effect of neural adaptation of central neural drive. Also, it was found that there was closely relationship between MVIC and neural adaptation of central neural drive by NMES.
Indirect fertility analysis in painters exposed to ethylene glycol ethers: Sensitivity and specificity (1991)

Semen analysis has proven useful in the clinical diagnosis of infertility and is the most widely used method of monitoring the effects of occupational exposure on male fertility. Collection and analysis of semen samples in a field setting, however, require a highly motivated population and excellent technical resources, limiting the widespread application of the method. Techniques of monitoring male worker fertility using questionnaires to avoid some of the difficulties of semen analysis have been developed. These methods compare the rate of observed births for wives of workers with expected birth rates derived either from U.S. fertility tables or from unexposed workers. The present study compares the sensitivity of this questionnaire method with that of semen analysis in an evaluation of reproductive function in men exposed to ethylene glycol ethers. The reproductive function of 74 married painters exposed to ethylene glycol ethers was compared with that of 51 married controls employed at a shipyard. The groups differed in sperm count, but the questionnaire method showed no effect of exposure on fertility. This analysis suggests that the questionnaire assessment of fertility is less sensitive than semen analysis as a screening tool for male reproductive function.
Service Migration for Connected Autonomous Vehicles (2020)

In Connected Autonomous Vehicles scenarios or CAV, ubiquitous connectivity will play a significant role in the safety of the vehicles and passengers. The extensive amount of sensors in each car will generate vast amounts of data that cannot be processed promptly by onboard units. Edge and fog computing are emerging solutions for remote data processing for autonomous vehicles, offering higher computing power, as well as the low latency required by autonomous driving. However, due to the highly distributed nature of fog and edge computing servers, CAV mobility may pose a challenge to keep services close to end-users and maintaining QoS. In this paper, we propose MOSAIC, service migration, and resource management algorithm for intra-tier and inter-tier communication in edge and fog computing. The proposed solution performs proactive migration of services based on mobility information, server resources, QoS, and network conditions. Simulation results show the efficiency of the proposed algorithm in terms of latency, migration failures, and network throughput.
Design of a wireless physiological parameter measurement and monitoring system (2007)

In this paper we present the design of a wireless, low-cost system that can be used to monitor physiological parameters, such as temperature, flex angle, pulse rate and oxygen saturation in the blood, of a human subject. The system consists of an electronic device which is worn as a hand glove, by an elderly or at-risk person. Using several sensors to measure different vital signs, the person is wirelessly monitored within his own home. The device also sends an alarm or SMS to a receiver unit that is connected to a computer. This sets off an alarm, allowing help to be provided to the patient. A prototype of the device has been fabricated and extensively tested with good results.
HogWild++: A New Mechanism for Decentralized Asynchronous Stochastic Gradient Descent (2016)

Stochastic Gradient Descent (SGD) is a popular technique for solving large-scale machine learning problems. In order to parallelize SGD on multi-core machines, asynchronous SGD (Hogwild!) has been proposed, where each core updates a global model vector stored in a shared memory simultaneously, without using explicit locks. We show that the scalability of Hogwild! on modern multi-socket CPUs is severely limited, especially on NUMA (Non-Uniform Memory Access) system, due to the excessive cache invalidation requests and false sharing. In this paper we propose a novel decentralized asynchronous SGD algorithm called HogWild++ that overcomes these drawbacks and shows almost linear speedup on multi-socket NUMA systems. The main idea in HogWild++ is to replace the global model vector with a set of local model vectors that are shared by a cluster (a set of cores), keep them synchronized through a decentralized token-based protocol that minimizes remote memory access conflicts and ensures convergence. We present the design and experimental evaluation of HogWild++ on a variety of datasets and show that it outperforms state-of-the-art parallel SGD implementations in terms of efficiency and scalability.
Quality metrics influence on iris recognition systems performance (2011)

When working with biometrics, regardless of the modality, it is essential to consider data quality, as it can limit the accuracy of recognition systems. In this context, the assessment of biometric samples quality by defining quality metrics can be used to enhance the performance and functionality of a biometric system. In this work, the influence of ISO/IEC 29794-6 quality metrics on iris recognition systems performance has been analysed. To carry out the analysis, the corresponding metrics have been calculated according to the computational method detailed in the standard and a quality score has been obtained. Then, in order to determine the metrics influence, an open source iris recognition system as well as one publicly available dataset, have been used. Results show to what extent an iris recognition system can be affected by input images quality, and also the most influential quality metrics on recognition accuracy.
High Temperature Infrared Cells for Studies of Solid High Polymer Reactions (1961)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh Temperature Infrared Cells for Studies of Solid High Polymer ReactionsW. A. BishopCite this: Anal. Chem. 1961, 33, 3, 456–459Publication Date (Print):March 1, 1961Publication History Published online1 May 2002Published inissue 1 March 1961https://pubs.acs.org/doi/10.1021/ac60171a046https://doi.org/10.1021/ac60171a046research-articleACS PublicationsRequest reuse permissionsArticle Views18Altmetric-Citations2LEARN 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
The development of plastics (1994)

Victorian plastics - foundations of an industry, C. Williamson parkesine and celluloid, S. Mossman Britain and the bakelite revolution, P. Reboul materia nova - plastics and design in the USA, 1925-1935, J. Meikle synthetic rubber - autarky and war, P. Morris polythene - the early years, G. Wilson plastics and prosperity, 1945-1970, M. Thatcher versatility of acrylics, J. Tilley fibre reinforced composites, B. Parkyn.
The Productivity Costs of Inefficient Hiring Practices: Evidence From Late Teacher Hiring (2016)

We use matched employee-employer records from the teacher labor market to explore the effects of late teacher hiring on student achievement. Hiring teachers after the school year starts reduces student achievement by 0.042SD in mathematics and 0.026SD in reading. This reflects, in part, a temporary disruption effect in the first year. In mathematics, but not in reading, late-hired teachers remain persistently less effective, evidence of negative selection in the teacher labor market. Late hiring concentrates in schools that disproportionately serve disadvantaged student populations, contributing to challenges in ensuring an equitable distribution of educational resources across students.
Large space erectable structures. (1969)

Large space erectable structures rigidity, stiffness, thermal stability, structural efficiency and integrity
Adaptive Rendezvous for Heterogeneous Channel Environments in Cognitive Radio Networks (2016)

Rendezvous is the fundamental challenge in cognitive radio networks to find each other on a specific channel and establish a communication link. The primary focus of this paper is to design an algorithm for blind rendezvous, i.e., a rendezvous without a coordinator or common control channel. Channels to jump are assumed to be homogeneous in prior work; however, in the real world, channels exhibit different conditions. Therefore, we propose an adaptive jumping pattern such that a superior channel is considered more frequently based on its noise level and users have a greater possibility to rendezvous on such a channel. Furthermore, in this paper, we investigate the rendezvous problem with multiple radio interfaces. When multiple radio interfaces are available for users, the possibility of rendezvous increases; however, the number of channels to jump for each interface may not be the same as other users' interfaces. We propose an adaptive rendezvous algorithm that can function for multiple interfaces and different sizes of channel lists and an adaptive jumping pattern for different channel conditions. We prove that the proposed algorithm provides guaranteed rendezvous and derive the maximum time-to-rendezvous (TTR), which is also verified via simulation results. Further, our algorithm outperforms jump-and-stay in terms of TTR while enabling users to rendezvous on a better channel.
A Novel Compact Forward-Wave Directional Coupler Design Using Periodical Patterned Ground Structure (2011)

A novel forward-wave directional coupler with periodical patterned ground structures is proposed. The input impedance of the even and odd mode of the proposed coupler can be matched, and the phase difference between the even and odd mode is also strongly enhanced. The equivalent models are constructed to predict the propagation properties based on the Bloch-Floquet theorem. A completed design procedure is also proposed based on the equivalent models. This two-layer structure is fabricated on Duroid substrate. 0.5-dB coupling level can be measured at 1.5 GHz, and the coupler length is 0.5 λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">g</sub> . Compared to previous studies, the proposed coupler can be designed at a lower frequency range with a smaller size.
Local Privacy, Data Processing Inequalities, and Statistical Minimax Rates (2013)

Working under a model of privacy in which data remains private even from the statistician, we study the tradeoff between privacy guarantees and the utility of the resulting statistical estimators. We prove bounds on information-theoretic quantities, including mutual information and Kullback-Leibler divergence, that depend on the privacy guarantees. When combined with standard minimax techniques, including the Le Cam, Fano, and Assouad methods, these inequalities allow for a precise characterization of statistical rates under local privacy constraints. We provide a treatment of several canonical families of problems: mean estimation, parameter estimation in fixed-design regression, multinomial probability estimation, and nonparametric density estimation. For all of these families, we provide lower and upper bounds that match up to constant factors, and exhibit new (optimal) privacy-preserving mechanisms and computationally efficient estimators that achieve the bounds.
Further studies on the development of a live attenuated vaccine against turkey rhinotracheitis (1991)

Turkey rhinotracheitis (TRT) virus attenuated by passaging in Vero cells was tested at two different passage levels (15 or 25 passages) and two dose levels [10(3) or 10(4) TCID50 (50% tissue culture infectious doses) per bird] to determine the efficacy in protecting turkey poults against experimental challenge with virulent TRT virus. Following administration by the eyedrop route at 10 days of age, all four preparations proved successful in providing protection against clinical disease and establishment of challenge virus in the trachea when challenged with virulent virus 3 weeks later. Twelve-day-old poults given the 25th Vero passage TRT virus at a dose of 10(3.5) TCID50 per bird were protected against experimental challenge with virulent virus for at least 22 weeks post-primary inoculation. The 25th passage virus was tested for safety by administering ten times the dose (10(4.5) TCID50 per bird) used in the previous trial to a group of 10-day-old turkey poults. None of the birds showed any clinical signs during 21 days post-inoculation. Attempts to back-passage the virus from bird to bird were unsuccessful.