gebhart/patrepeval huggingface dataset:
High frequency ionospheric propagation phenomena. (1976)

PROJECT BRIGHAM was a Department of Defense data collection effort wherein 890 kHz wide samples of the HF spectrum were acquired using a 25 Hz sampling rate with 2.8 kHz resolution for a period of up to 2.4 minutes. The main thrust of this paper has been the visual examination of the data on a graphics display with the idea of identifying drastic and unexpected changes in either individual signals or the entire wavefront; those changes being due, at least in part, to signal transformation resulting from various ionospheric phenomena. In addition, an in-depth statistical study was conducted on several of the specific signals with the hope of aiding in the formulation of an algorithm to efficiently automate the receiving system's sensitivity settings. (Author)
Jujube post-harvest fruit quality and storagability in response to agro-chemicals preharvest application (2012)

The present study was conducted on Peyuan jujube cultivar (Ziziphus Mauritania Lamk) during the two successive seasons, 2010 and 2011 at Research and Agricultural Experimental Station, King Saud University, Saudi Arabia in order to investigate the effects of preharvest application of putrescine (Put), gibberellic acid (GA3), salicylic acid (SA), naphthalene acetic acid (NAA), cytofex (CPPU) and calcium chloride (CaCl2) on fruit yield, ripening date and quality at harvest and after cold storage at 5°C and 85 to 90% relative humidity (RH). Fruits were sprayed once three weeks before harvest (at the beginning of fruit color break) when they reached a diameter of 6 to 7 mm. Data showed that, the latest harvest was obtained with NAA followed by GA3 and CPPU treatments and then SA and CaCl2. The CaCl2 and NAA gave the shortest harvest spread (period). All agro-chemical substances gave the lowest yield percentage at the first harvest date, while at the second harvest date, GA3, putrescine (Put) and SA sprays resulted in the highest yield followed by CPPU and then NAA applications. At the third harvest date the NAA, GA3, Put and CPPU gave the highest yield percent followed by SA and then CaCl2. Fruit vitamin C, total soluble solids (TSS), acidity, firmness and quality grade increased significantly by all treatments as compared with the control either at harvest time or after cold storage. The percentage of fruit weight loss, commercially unacceptable peel as well as, fruit browning index tended to decrease with all sprayed substances.

	 

	Key words: Jujube, fruit quality, storagability, agro-chemicals, pre-harvest application.
Stress and Anxiety Measurement "In-the-Wild" Using Quality-aware Multi-scale HRV Features (2019)

Heart rate variability (HRV) has been studied in the context of human behavior analysis and many features have been extracted from the inter-beat interval (RR) time series and tested as correlates of constructs such as mental workload, stress and anxiety. Most studies, however, have been conducted in controlled laboratory environments with artificially-induced psychological responses. While this assures that high quality data are collected, the amount of data is limited and the transferability of the findings to more ecologically-appropriate settings (i.e., "in-the-wild") remains unknown. In this paper, we explore the use of motif-based multi-scale HRV features to predict anxiety and stress in-the-wild. To further improve their robustness to artifacts, we propose a quality-aware feature aggregation method. The new quality-aware features are tested on a dataset collected using a wearable biometric sensor from over 200 hospital workers (nurses and staff) during their work shifts. Results show improved stress/anxiety measurement over using conventional time- and frequency-domain HRV measures.
Redox status and protein binding of plasma aminothiols during the transient hyperhomocysteinemia that follows homocysteine administration (1993)

We administered reduced L-homocysteine perorally (67 mumol/kg of body wt) to 12 healthy subjects and injected the same dose into one person, and determined the kinetics of the alterations in reduced, oxidized, and protein-bound concentrations of homocysteine, cysteine, and cysteinylglycine. After oral intake, reduced homocysteine increased rapidly (tmax < or = 15 min), reaching concentrations [3.97 (SD 2.99) mumol/L] 20-fold above fasting values, and then declined towards the normal concentration within 2 h. There was a similar increase in reduced cysteine and a moderate increase in reduced cysteinylglycine. During this response, we observed a positive correlation between the reduced/total ratio for homocysteine and cysteine. When homocysteine was injected, the increase in reduced homocysteine preceded the increase in reduced cysteine by about 3 min. After oral loading, oxidized homocysteine showed a transient increase (tmax = 30 min) that lagged behind the increase of reduced homocysteine. Oxidized cysteine and cysteinylglycine were stable or decreased slightly. Protein-bound homocysteine increased the least rapidly after homocysteine administration (tmax = 1-2 h), and returned to normal values slowly. Changes in protein-bound homocysteine essentially mirrored a concurrent decrease in protein-bound cysteine, suggesting displacement of bound cysteine. These data show that plasma homocysteine has a pronounced, direct effect on the redox status and protein binding of other plasma thiol components. Such effects should be recognized when studying the mechanisms behind the atherogenic effect of increased plasma homocysteine.
Innovative Robust Modulation Classification Using Graph-Based Cyclic-Spectrum Analysis (2016)

A novel automatic modulation classification method based on the graph presentation of the cyclic spectrum is proposed. In our proposed scheme, the periodicity and the symmetry of the cyclic spectrum will be exploited to establish a concise feature representation of multiple graphs. The modulated signal is first transformed from the cycle-frequency domain into the graph domain. Consequently, the concise graph-presentation, namely, a set of weighted directed rings, will be formulated as the robust features of the original signal. Those features can be easily expressed by the corresponding adjacency matrices. It can be verified that the adjacency matrices are sparse and the non-zero entries therein can be registered as the efficient feature parameters. Through the Hamming distance measure to enumerate the difference between the feature parameters resulting from the training data and the test data, one can perform the modulation classification. Monte Carlo simulation results demonstrate that our proposed method can achieve much better classification accuracy than the existing technique when the cyclic spectrum is used.
Energy efficient near-threshold chip multi-processing (2007)

Subthreshold circuit design has become a popular approach for building energy efficient digital circuits. One drawback is performance degradation due to the exponentially reduced driving current. This had limited subthreshold circuits to relatively low performance applications such as sensor networks. To retain the excellent energy efficiency while reducing performance loss, we propose to apply subthreshold and near-threshold techniques to chip multi-processors. We show that an architecture where several slower cores are clustered together with a shared faster L1 cache is optimal for energy efficiency, because processor cores and memory operate best at different supply and threshold voltages. In particular, SPLASH2 benchmarks show about a 53% energy improvement over the traditional CMP approach (about 70% over a single core machine).
Estimation of round trip time in distributed real time system architectures (2013)

Real-time distributed systems often utilize centralized nodes to manage and coordinate the exchange of information; in particular, for users to are unable to communicate directly because of their location behind firewalls or proxy servers. Identifying these nodes is crucial for successful operation of the entire distributed system. The geo-locational placement of these relay node can be determined based on network properties such as Round Trip Time (RTT). In this paper a real-time e-learning system - Remote Access Laboratories (RAL) are discussed as an example of a distributed real-time system. RTT is an important factor directly impacting the Quality of Experience (QoE) of users. In a distributed RAL environment, there may be multiple users who can be both learners (service users) and providers in an activity. As such, the equipment and corresponding learning materials are not concentrated at one location, but spread over multiple nodes. A method to determine the suitable node or relay based on population distribution in a geographic region and projected RTT based on distance between them is proposed here. A mathematical model and simulation data are presented to support the effectiveness of the method. The results are compared with peer-to-peer network model, which is optimal, to establish the difference in performance.
Photoinitiators for Free Radical Polymerization Reactions (2010)

This chapter contains sections titled: Introduction Properties of a photoinitiating system Available photoinitiators: overview Reactivity of photoinitiators Applications of photoinitiators Conclusion References
Evidence for Allograft Rejection in an Islet Transplant Recipient and Effect on β-Cell Secretory Capacity (2007)

Because the AIR(pot), a measure of beta-cell secretory capacity, provides an estimate of functional beta-cell mass, this case documents that islet graft loss can coincide with donor human leukocyte antigen sensitization and that the effect on beta-cell mass may be best estimated from the AIR(arg) or AIR(pot).
Complexity of Consistent Query Answering in Databases under Cardinality-Based and Incremental Repair Semantics (2006)

Consistent Query Answering (CQA) is the problem of computing from a database the answers to a query that are consistent with respect to certain integrity constraints that the database, as a whole, may fail to satisfy. Consistent answers have been characterized as those that are invariant under certain minimal forms of restoration of the database consistency. We investigate algorithmic and complexity theoretic issues of CQA under database repairs that minimally depart -wrt the cardinality of the symmetric difference- from the original database. We obtain first tight complexity bounds. We also address the problem of incremental complexity of CQA, that naturally occurs when an originally consistent database becomes inconsistent after the execution of a sequence of update operations. Tight bounds on incremental complexity are provided for various semantics under denial constraints. Fixed parameter tractability is also investigated in this dynamic context, where the size of the update sequence becomes the relevant parameter.
Carbon-13 NMR of the amorphous polymer of lysine-formaldehyde-urea (1979)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbon-13 NMR of the amorphous polymer of lysine-formaldehyde-ureaFranklin E. Barton II, David S. Himmelsbach, and Henry E. AmosCite this: J. Agric. Food Chem. 1979, 27, 1, 140–145Publication Date (Print):January 1, 1979Publication History Published online1 May 2002Published inissue 1 January 1979https://pubs.acs.org/doi/10.1021/jf60221a054https://doi.org/10.1021/jf60221a054research-articleACS PublicationsRequest reuse permissionsArticle Views54Altmetric-Citations1LEARN 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
Customer perceptions of the attractiveness of shopping centres in Pretoria : research article (2004)

The primary objective of this study was to investigate the perceptions of patrons regarding the attractiveness of shopping centres in Pretoria. The study was executed in two phases. The aim of phase one was to explore this field of study in the local context, while phase two endeavoured to measure respondents' perceptions with regard to certain attributes of one of the largest shopping centres in Africa. The measuring instrument used in the study was based on scales used in studies abroad and adapted for local use. The study found that male and female customers do not differ significantly with respect to their perceptions of certain shopping centre attributes, while differences do exist between the perceptions of black and white respondents regarding some of the attributes used to measure the attractiveness of the centre.
Image contrast in polarization microscopy of magneto-optical disk data-storage media through birefringent plastic substrates (1997)

Using polarized-light microscopy, we have investigated the magnetic domains of perpendicularly magnetized media under several different conditions, including direct observation of the thin-film magnetic layer and observations through the glass or plastic substrates on which the magnetic film was deposited. The results show that the image contrast is reduced with an increasing numerical aperture of the objective lens. They also indicate that the polarization rotation caused by differences between the reflectivity-transmissivity of the p and s components of polarization deteriorate the magnetic image contrast. Furthermore, by comparing the image quality using the same objective lens on samples having different substrates, we found that the images obtained through plastic substrates are worse than those obtained through glass substrates. Birefringence of the plastic substrate is shown to be responsible for the additional degradation of the image contrast.
High-performance GaAs heterojunction bipolar transistor logarithmic IF amplifier (2003)

A GaAs/AlGaAs heterojunction bipolar transistor (HBT) was used to synthesize a high-performance true logarithmic intermediate-frequency (IF) amplifier based on a silicon bipolar transistor dual-gain log-stage design. The HBT log IF amplifier monolithically integrates four log stages to achieve a piecewise-linear approximated log function for compression of wide-dynamic-range signals. A fabrication process based on metal-organic chemical vapor deposition (MOCVD) epitaxy and a 3- mu m emitter self-aligned base ohmic transistor was used. The true log IF amplifier's performance includes a DC-3-GHz IF/video bandwidth, 400-ps rise time, and les than +or-1-dB log error over about a 40-dB dynamic range at 3 GHz.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
ATOMIC IODINE USER UTILIZED HIGH-PRESSURE PULSED SINGLET OXYGEN GENERATOR (1991)

A pulsed iodine laser driven by a chemical oxygen generator was developed. The energy deposition on I(2P3/2) was made by a high pressure pulsed [MATH] generator. Although this scheme is same as the conventional Chemically pumped Oxygen-Iodine Lasers (COIL), it is unique in that the pulsed laser was extracted by the high-energy density pulsed pumping scheme. The pulse energy obtained was 2.46J, the maximum peak power obtained was 900W. Pulse width was ranging from 2ms to 5ms. The specific energy was estimated to be 7.7J/l.
Redundancy of the Lempel-Ziv incremental parsing rule (1997)

The Lempel-Ziv codes are universal variable-to-fixed length codes that have become virtually standard in practical lossless data compression. For any given source output string from a Markov or unifilar source, we upper-bound the difference between the number of binary digits needed to encode the string and the self-information of the string. We use this result to demonstrate that for unifilar or Markov sources, the redundancy of encoding the first n letters of the source output with the Lempel-Ziv incremental parsing rule (LZ'78), the Welch modification (LZW), or a new variant is O((ln n)/sup -1/), and we upper-bound the exact form of convergence. We conclude by considering the relationship between the code length and the empirical entropy associated with a string.
Novel Vertical Split Ring Resonator Fabricated in LTCC (2007)

-A novel half-wavelength resonator with small size and high Q is proposed for the first time in the world. Two folded quarter-wavelength resonators are vertically stacked owing to the multilayer nature of LTCC (low temperature co-fired ceramic). Each electrode part is connected with via holes. It is named as "VSRR" (Vertical Split Ring Resonator). The super miniature size with high Q is obtained by this structure. The resonance frequency is easily calculated by circuit model and 3D EM simulation as well. The performance of experimental resonators shows good agreement with theory.
Statistics of cell adhesion under hydrodynamic flow: simulation and experiment. (1993)

Adhesion under hydrodynamic flow is a step in many complicated physiological processes such as the neutrophil-mediated inflammatory response and cancer cell metastasis. We use a combination of computer simulation and experiment to explore how a population of cells interacts with a ligand-coated substrate under shear flow. To simulate the binding of a single cell to a surface, we use a microvilli-hard sphere model in which receptor-ligand bonds are treated as springs, and the net motion of the cell is determined from a force balance involving hydrodynamic, bonding, and colloidal forces. We show that the adhesive phenotype of a cell depends strongly on the fractional spring slippage of receptor-ligand bonds, which relates the extension of a bond to its rate of breakage; a lower spring slippage indicates bonds can withstand a great deal of extension without a significant increase in the breakage rate, and hence leads to more strongly adherent cells. We construct the behavior of a population of cells by simulating many cells using this algorithm. We show that a homogeneous population of cells with identical numbers of receptors, modeled with parameters suitable to recreate neutrophil rolling, will display a distribution of translational velocities. In addition, we calculate the average velocity for a heterogeneous population of cells which has a Gaussian distribution in receptor number. As the standard deviation of this distribution increases, the average observed velocity for the population increases. Although the homogeneous and heterogeneous populations have the same average number of receptors (10(5)) per cell, there is a significant difference in their average velocity when the standard deviation of receptor number in the heterogeneous population is as little as 25% of the average receptor number. We also present experimental evidence that not all cells exhibit the slow rolling characteristic of neutrophil-endothelial interaction, but rather appear to exist in a "binary" state in which cells are either adherent or noninteracting. We have developed an experimental model system for studying adhesion under hydrodynamic flow, using the rat basophilic leukemia (RBL) derivatized polyacrylamide gels in a flow chamber. Cells are injected into a portion of the flow chamber in which the substrate is not coated with antigen, and allowed to flow over the antigen-coated portion of the gel. We have measured the spatial distribution of cell binding for a population of cells at different flow rates, and have shown that cell binding decreases as shear rate increases.(ABSTRACT TRUNCATED AT 400 WORDS)
Design Strategies for High Power vs. High Energy Lithium Ion Cells (2019)

Commercial lithium ion cells are now optimised for either high energy density or high power density. There is a trade off in cell design between the power and energy requirements. A tear down protocol has been developed, to investigate the internal components and cell engineering of nine cylindrical cells, with different power–energy ratios. The cells designed for high power applications used smaller particles of the active material in both the anodes and the cathodes. The cathodes for high power cells had higher porosities, but a similar trend was not observed for the anodes. In terms of cell design, the coat weights and areal capacities were lower for high power cells. The tag arrangements were the same in eight out of nine cells, with tags at each end of the anode, and one tag on the cathode. The thicknesses of the current collectors and separators were based on the best (thinnest) materials available when the cells were designed, rather than materials optimised for power or energy. To obtain high power, the resistance of each component is reduced as low as possible, and the lithium ion diffusion path lengths are minimised. This information illustrates the significant evolution of materials and components in lithium ion cells in recent years, and gives insight into designing higher power cells in the future.
Vertical nanowire transistors with low leakage current (2004)

A vertical field-effect transistor based on semiconductor nanowires is reported. The fabrication of the device uses a self-supporting flexible nanostructured polymer foil as a template and an electrochemical growth technique for the preparation of the semiconductor. The fabrication process is substantially simpler, and the mechanical robustness is strongly increased as compared to the original device. The channel region of the transistor has a diameter of ∼100nm and a length of ∼50nm. Operation in the hole depletion mode allows a change of the transfer conductance by ∼50% when the gate voltages is changed in the range ∓1V. The gate leakage current is ∼600fA per transistor. The overall layout is suitable for optical pixel control on large-area flexible substrates.