gebhart/patrepeval huggingface dataset:
An electrostatic audio generator (1935)

Design and operating features of a multi-harmonic electrostatic audio frequency generator are described in this paper. The harmonics are generated singly by the rotation of a shielded segmented disk adjacent to a stationary wave pattern plate; the resulting changes in capacitance between disk and plate produce a sinusoidal charging and discharging current through an input resistance of a vacuum tube amplifier. Each harmonic is controlled independently in amplitude and in phase, and provisions are made for combining any 2 or more harmonics to obtain complex wave forms. Although designed specifically for psychological tests, the device should prove useful in any work requiring a flexible audio frequency supply of small capacity.
Recurrent neural networks for object detection in video sequences (2017)

This thesis explores recurrent neural network based methods for object detection in video sequences. Several models for object recognition are compared by using the KITTI object tracking dataset containing photos taken in an urban traffic environment. Metrics such as robustness to noise and object velocity prediction error are used to analyze the results. Neural networks and their training methodology is described in depth and recent models from the literature are reviewed. \n\nSeveral novel convolutional neural network architectures are introduced for the problem. The VGG-19 deep neural network is enhanced with convolutive recurrent layers to make it suitable for video analysis. Additionally a temporal coherency loss term is introduced to guide the learning process. Velocity estimation has not been studied in the literature and the velocity estimation performance was compared against a baseline frame-by-frame object detector neural network.\n\nThe results from the experiments show that the recurrent architectures operating on video sequences consistently outperform an object detector that only perceives one frame of video at once. The recurrent models are more resilient to noise and produce more confident object detections as measured by the standard deviation of the predicted bounding boxes. The recurrent models are able to predict object velocity more accurately from video than the baseline frame-by-frame model.
Nanoparticle‐Decorated Nanocanals for Surface‐Enhanced Raman Scattering (2008)

Nanoparticle-decorated nanocanal arrays show significant enhancement of Raman scattering for a model explosive-related dinitrotoluene compound. The Raman scattering by gold nanoparticles distributed along nanocanals (see image) is efficiently combined with optical-wave guiding to allow significant surface-enhanced Raman scattering.
The Reactions of Cellulose with Amic Acids and Anhydride Ammonia (1975)

The reactivity of phthalamic add toward primary and secondary hydroxyl groups in ester formation was studied to provide insight into the mechanism of the same esterification involving cellulosic fabrics. The over-all stoichiometry of the amic acid, alcohol reaction and the effect of the dielectric constant of the reaction medium were also examined. Isomeric pairs of low molecular weight primary and secondary alcohols and also methanol were used as models for this study. Reactivity was characterized by determination of yields in the esterification reaction. Conclusions based on the reactions of the model compounds were tested using polymeric alcohols. The mechanistic implications of the results are discussed.
Seismic data modelling using parallel distributed M <scp>atlab</scp> (2009)

Numerical modelling of seismic wave propagation is central to seismic imaging and inversion. Modelling of 3D heterogeneous anisotropic media can, however, simultaneously be both costly and of low fidelity. To address some aspects of the fidelity / cost problem, we present our implementation of seismic modelling within the Rayleigh‐Sommerfeld algorithmic framework and implemented in a parallel computing environment. We demonstrate through example, that knowledge of relationships among hardware architecture, support software systems, and resource usage of our algorithm, is of crucial importance to the achievement of worthwhile performance using parallel computing. From an initial, simplistic expression of our parallel algorithm in the Matlab system, exhibiting ‘negative improvement’, we incrementally adapt the parallel control framework without losing the clarity or correctness of the original model expression, to bypass successive bottlenecks and achieve substantial performance gains
Maturation Analysis in Connective Tissue Proteins by [14C]Cyanide Incorporation (1974)

Abstract The use of a reaction involving [14C]cyanide and ammonia to stabilize and identify aldehydic cross-links in elastin and collagen is described. The products resulting from acid hydrolysis are in the form of 14C-labeled amino acids. The reaction was first studied with periodate-treated collagens, used as a model of collagen with aldehyde side chains. In these collagens the α-aminoglutaryl γ-semialdehyde residues react with [14C]cyanide and ammonia almost quantitatively and the expected product, after acid hydrolysis, is predominantly [14C]α, δ-diaminoadipic acid. This product indeed was isolated and identified. In elastin three amino acids derived from cross-links were isolated and their structures established. They are α,e-diaminopimelic acid, 1,9-diamino-1,9-dicarboxy-4-glycino-non-4-ene (carboxy amino aldol), and 2-amino-6-lysinopimelic acid (carboxylysinonorleucine). These compounds arise, respectively, from modification of residues of α-amino adipic acid δ-semialdehyde,aldol condensate of α-aminoadlpic acid δ-semialdehyde, and dehydrolysinonorleucine, and are in full agreement with structures of such compounds previously deduced using established sodium borohydride reduction procedures. Aldimines are modified with cyanide directly, not requiring the presence of ammonia. Cross-links already in the reduced form in the native protein, and the pyridinium forms of the desmosines do not incorporate the label and can be directly observed and quantitated by established procedures. The contents of modified cross-links can be estimated when the specific activity of Na14CN is known.
Deep convolutional neural network-based feature extraction for steganalysis of content-adaptive JPEG steganography (2019)

Deep learning-based steganalysis techniques have significantly progressed in recent years. Compared with typical steganalysis methods using rich model features and classifiers, deep learning-based steganalysis methods usually train a deep convolutional neural network (CNN) as the steganography detector. One advantage of a deep CNN is the strong capability for discriminative feature learning. The input feature map of the fully connected layer is the steganalysis feature learned using the deep CNN. We can, therefore, extract the steganalysis feature based on the trained deep CNN. Compared with steganalysis features constructed by hand, the extraction of steganalysis features using a deep CNN can take advantage of the strong feature-learning capability of such a network. Therefore, two types of typical steganalysis frameworks are first compared. Then, a deep CNN for steganalysis feature learning is constructed, and the setting of the image preprocessing layer is discussed. Next, the detection performances of the different learned steganalysis features are compared. Finally, the detailed extraction process of the proposed learned steganalysis feature is described. The experiment results show that the proposed steganalysis method, combining learned and handcrafted steganalysis features, can significantly improve the detection performance for content-adaptive JPEG steganography.
Rod function evaluation by the use of synchronous detector techniques for electroretinographic analysis. (1971)

The synchronous detector technique is described for recording electroretinograms (ERG) with particular reference to separation of rod and cone function. Thus rod function is emphasized by using blue stimuli at rates of 5 to 17 cycles per second, with a darkened background. The basic principles of signal detection are the same as have been described for measurement of cone function, when white -flash stimuli are used at frequencies of 17 to 60 cycles per second, with normal background illumination. The results are of markedly different character, however, with an average rod delay time which is longer (average 61 msec.) than the average cone delay time (24 msec). The results are compared with the conventional averaged waveform ERG presentation in normal subjects and in subjects icith achromatopsia and retinitis pigmentosa.
Policy-Driven System Configuration for Dependability (2008)

When managing a complex information system for critical activities, reaching an high level of dependability is a key requirement. A central challenge is identifying a set of alternative system configurations to be enforced when particular system situations take place. In large systems, this task requires automation as the administrator can hardly cope with the complexity of all components and their interactions. We propose an innovative approach, based on model transformation, to perform automatic generation of alternative configurations taking into account dependability constraints.
Generation of Einstein-Podolsky-Rosen Pairs of Atoms (1997)

Pairs of atoms have been prepared in an entangled state of the Einstein-Podolsky-Rosen (EPR) type. They were produced by the exchange of a single photon between the atoms in a high $Q$ cavity. The atoms, entangled in a superposition involving two different circular Rydberg states, were separated by a distance of the order of 1 cm. At variance with most previous EPR experiments, this one involves massive particles. It can be generalized to three or more atoms and opens the way to new tests of nonlocality in mesoscopic quantum systems.
Technological issues of high-pressure grinding rolls operation in ore comminution processes (2011)

The issues concerning operating parameters of HPGR were presented in the article. The High-Pressure Grinding Rolls technology is currently the most efficient method of crushing in hard ore industry, but the issue still needs extensive investigations in order to increase the performance efficiency. In the first section the basic issues of HPGR technology were described, focusing on various technological operating parameters of the device. The key relationships were also initially determined. In the next sections the analysis of the impact of parameters on the comminution results and interactions among parameters were investigated. The functional regressive relationships for the press throughput, gap and energy consumption were determined considering the operating pressure and speed as independent variables. The best model was obtained for the specific energy consumption index, but two remaining models also show high level of accuracy. It appears that parameters related to the energy consumption of the device and the operating pressure are these of the major importance from the technological point of view.
High-Throughput Screening of Lead-Free Perovskite-like Materials for Optoelectronic Applications (2017)

We use high-throughput density functional theory calculations to screen lead-free perovskite-like materials with compositions A2BB′X6, ABX4, and A3B2X9 for optoelectronic performance. We screen monovalent A and B′ cations from Na, K, Rb, Cs Cu, and Ag, trivalent B cations from Ga, In, and Sb, and monovalent anions from Cl, Br, and I. Our screening procedure is based on formation energy and hybrid HSE06 functional predicted bandgaps. We screened more than 480 compounds and found 10 compounds that have bandgaps in the 1.5–2.5 eV range. Of these 10 compounds, seven are new, not having been reported before. We further characterize effective masses, density of states, and absorption coefficients of these selected compounds for their suitability in optoelectronic applications. All 10 of these selected compounds are lead-free and are solution processable. These compounds pave a path forward for lead-free photovoltaics and light emission devices.
EventRadar: A Real-Time Local Event Detection Scheme Using Twitter Stream (2012)

Twitter has become popular among researchers as a means to detect various kinds of events. Several attempts were made to detect trends, real world events, news, earthquakes and others with satisfying results. However they do not perform well on finding local events such as release parties, musicians in a park, or art exhibitions. Many of the local events that were found by algorithms of existing work were not related to an event but to locations, global events, or just common words. In this paper, we introduce Event Radar, a novel local event detection method to improve the precision by analyzing seven day historic Tweet data. We estimate the average Tweet frequency of keywords per day in and around a potential event area and use these estimations to classify whether the keywords are related to a local event. The proposed scheme achieves a precision rate of 68% which is a significant improvement compared to related work that states a precision rate of 25.5%.
Biological Properties of 16α-Hydroxyestrone: Implications in Estrogen Physiology and Pathophysiology* (1980)

Metabolism of estradiol in men with cirrhosis and subjects with systemic lupus erythematosus results in an excessive formation of 16 alpha-hydroxyestrone. Examination of the biological activity of this metabolite showed that it is a potent uterotropic agent and that it exhibits minimal affinity for the human sex hormone-binding globulin. These biological characteristics are consistent with a hyperestrongenic response to the substance, which may be reflected in the pathology and etiology of these diseases.
A note on the racemization of serine (1951)

Research Article| February 01 1951 A note on the racemization of serine J. C. Crawhall; J. C. Crawhall 1National Institute for Medical Research, Mill Hill, London, N.W. 7 Search for other works by this author on: This Site PubMed Google Scholar D. F. Elliott D. F. Elliott 1National Institute for Medical Research, Mill Hill, London, N.W. 7 Search for other works by this author on: This Site PubMed Google Scholar Biochem J (1951) 48 (2): 237–238. https://doi.org/10.1042/bj0480237 Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Facebook Twitter LinkedIn MailTo Cite Icon Cite Get Permissions Citation J. C. Crawhall, D. F. Elliott; A note on the racemization of serine. Biochem J 1 February 1951; 48 (2): 237–238. doi: https://doi.org/10.1042/bj0480237 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 ContentAll JournalsBiochemical Journal Search Advanced Search This content is only available as a PDF. © 1951 CAMBRIDGE UNIVERSITY PRESS1951 Article PDF first page preview Close Modal You do not currently have access to this content.
Agents of alienation (1995)

article Free Access Share on Agents of alienation Author: Jaron Lanier View Profile Authors Info & Claims InteractionsVolume 2Issue 3July 1995 pp 66–72https://doi.org/10.1145/208666.208684Published:01 July 1995Publication History 20citation942DownloadsMetricsTotal Citations20Total Downloads942Last 12 Months66Last 6 weeks8 Get Citation AlertsNew Citation Alert added!This alert has been successfully added and will be sent to:You will be notified whenever a record that you have chosen has been cited.To manage your alert preferences, click on the button below.Manage my AlertsNew Citation Alert!Please log in to your account Save to BinderSave to BinderCreate a New BinderNameCancelCreateExport CitationPublisher SiteeReaderPDF
Transplantation of mesenchymal stem cells in a canine disc degeneration model (2008)

Transplantation of mesenchymal stem cells (MSCs) is effective in decelerating disc degeneration in small animals; much remains unknown about this new therapy in larger animals or humans. Fas-ligand (FasL), which is only found in tissues with isolated immune privilege, is expressed in IVDs, particularly in the nucleus pulposus (NP). Maintaining the FasL level is important for IVD function. This study evaluated whether MSC transplantation has an effect on the suppression of disc degeneration and preservation of immune privilege in a canine model of disc degeneration. Mature beagles were separated into a normal control group (NC), a MSC group, and the disc degeneration (nucleotomy-only) group. In the MSC group, 4 weeks after nucleotomy, MSCs were transplanted into the degeneration-induced discs. The animals were followed for 12 weeks after the initial operation. Subsequently, radiological, histological, biochemical, immunohistochemical, and RT-PCR analyses were performed. MSC transplantation effectively led to the regeneration of degenerated discs. FACS and RT-PCR analyses of MSCs before transplantation demonstrated that the MSCs expressed FasL at the genetic level, not at the protein level. GFP-positive MSCs detected in the NP region 8 weeks after transplantation expressed FasL protein. The results of this study suggest that MSC transplantation may contribute to the maintenance of IVD immune privilege by the differentiation of transplanted MSCs into cells expressing FasL.
Power devices for grid connections (2012)

Power electronic interfaces are vital to advanced, smarter, distributed grids and micro-grids and the capabilities and limitations of power devices are integral to this. This paper discusses existing and emerging applications of grid connected electronic interfaces that are enabled by Power Semiconductor Devices. The application focus will be on: (1) inverters, which are a key element of modern distributed and renewable energy systems; (2) solid-state transformers which hold great promise to reduce size and weight, while enhancing performance, compared to existing Grid transformers; (3) MV static transfer switches, which facilitate redundant power at the medium voltage level. Capabilities and tradeoffs between Power circuit topologies, available devices, and circuit techniques are presented. Existing and projected market opportunities are also presented, and motivation for future device development is outlined. Emerging transformative research using wide band gap devices in silicon-dominated power device applications, along with hybrid power switch configurations, will also be highlighted. The compelling requirement of advanced grids for both fast fault current limiting, fast voltage control, and possibly increased overload capability to enable the much heralded advances, are also shown to be completely dependent on devices, along with their cost effective application.
Oxygen free radical damage in the cornea after excimer laser therapy (1997)

The presence of lipid peroxidation in the superficial corneal stroma in excimer laser treated corneas was demonstrated. This lipid peroxidation could be from oxygen free radicals generated by the infiltrating polymorphonuclear cells at the site of tissue damage.
Numerical simulation of VAWT stochastic aerodynamic loads produced by atmospheric turbauence: VAWT-SAL code (1991)

Blade fatigue life is an important element in determining the economic viability of the Vertical-Axis Wind Turbine (VAWT). A principal source of blade fatigue is thought to be the stochastic (i.e., random) aerodynamic loads created by atmospheric turbulence. This report describes the theoretical background of the VAWT Stochastic Aerodynamic Loads (VAWT-SAL) computer code, whose purpose is to numerically simulate these random loads, given the rotor geometry, operating conditions, and assumed turbulence properties. A Double-Multiple-Stream Tube (DMST) analysis is employed to model the rotor's aerodynamic response. The analysis includes the effects of Reynolds number variations, different airfoil sections and chord lengths along the blade span, and an empirical model for dynamic stall effects. The mean ambient wind is assumed to have a shear profile which is described by either a power law or a logarithmic variation with height above ground. Superimposed on this is a full 3-D field of turbulence: i.e., in addition to random fluctuations in time, the turbulence is allowed to vary randomly in planes perpendicular to the mean wind. The influence of flow retardation on the convection of turbulence through the turbine is also modeled. Calculations are presented for the VAWT 34-m Test Bed currently in operation at Bushland, Texas. Predicted time histories of the loads, as well as their Fourier spectra, are presented and discussed. Particular emphasis is placed on the differences between so-called steady-state'' (mean wind only) predictions, and those produced with turbulence present. Somewhat surprisingly, turbulence is found to be capable of either increasing or decreasing the average output power, depending on the turbine's tip-speed ratio. A heuristic explanation for such behavior is postulated, and a simple formula is derived for predicting the magnitude of this effect without the need for a full stochastic simulation. 41 refs., 32 figs., 1 tab.
Error concealment for video transmission with dual multiscale markov random field modeling (2003)

A novel error concealment algorithm based on a stochastic modeling approach is proposed as a post-processing tool at the decoder side for recovering the lost information incurred during the transmission of encoded digital video bitstreams. In our proposed scheme, both the spatial and the temporal contextual features in video signals are separately modeled using the multiscale Markov random field (MMRF). The lost information is then estimated using maximum a posteriori (MAP) probabilistic approach based on the spatial and temporal MMRF models; hence, a unified MMRF-MAP framework. To preserve the high frequency information (in particular, the edges) of the damaged video frames through iterative optimization, a new adaptive potential function is also introduced in this paper. Comparing to the existing MRF-based schemes and other traditional concealment algorithms, the proposed dual MMRF (DMMRF) modeling method offers significant improvement on both objective peak signal-to-noise ratio (PSNR) measurement and subjective visual quality of restored video sequence.
Ischemia-reperfusion of human skeletal muscle during aortoiliac surgery: effects of acetylcarnitine. (1994)

Our previous study on human skeletal muscle undergoing ischemia and reperfusion has revealed that granulocytes, which infiltrate the muscle tissue in large numbers, play an important role in mediating fibre injuries by producing superoxide anion (O2-) which is responsible for membrane lipid peroxidation. In the current study, five patients undergoing aortic reconstructive surgery were given acetyl-carnitine (2 mg/kg i.v. plus 1 mg/kg/min for 30 min) prior to the induction of ischemia. Muscle biopsies and blood samples were examined: a) after anaesthesia; b) at the end of ischemia; and c) 30 min after reperfusion, with the aim of elucidating whether acetylcarnitine could prevent the infiltration and/or the activation of granulocytes and eventually skeletal muscle injuries. During ischemia and reperfusion complement activation recruited numerous granulocytes into the muscle tissue, but, contrary to the untreated samples, the ability for O2(-)-generation of these cells remained at low levels and was comparable to that of ischemia even when molecular O2 was reintroduced to the tissue. Accordingly, the morphological changes of the postischemic muscle fibers were substantially reduced when compared to the untreated samples; in fact, the mitochondrial swelling was only moderate and the intramitochondrial dense bodies were small and scarce. The current findings support a positive role of acetyl-carnitine in ameliorating the ischemia-reperfusion (I-R)-induced damage of human skeletal muscle.