gebhart/patrepeval huggingface dataset:
High dynamic range current-to-digital readout electronics for lab-on-chip applications (2011)

In this work, the design and study of a complete system for the readout of photocurrents in high dynamic range applications is presented. The system implements a novel readout circuit, with a high input dynamic range, based on the Fractional Packet Counting concept. The proposed current-to-digital conversion scheme works in two steps: first of all a switched integrator is used to obtain a coarse conversion of the input signal by counting the number of times it is reset during the signal integration period. This method estimates the number of “charge packets” read by the system. For added accuracy, a second step uses a conventional ADC to convert the last incomplete charge packet at the end of the constant signal integration time, providing a “fine” readout. The system includes: circuits for biasing the device under test; an integrated heater coupled with a set of temperature sensors for temperature control of the device under test; a LED with 5-bit intensity control for the operation of the devices under illumination; a microcontroller for autonomous operation. Preliminary measurements performed on the fabricated board confirmed the correctness of the working principle. In particular the measured dynamic range has been found to be larger than 150 dB with the input current range extending from 32fA up to 2μA.
Joint Spectrum and Power Allocation for Multi-Node Cooperative Wireless Systems (2015)

Energy efficiency is a growing concern for wireless networks, not only due to the emerging traffic demand from smart devices, but also because of the dependence on the traditional unsustainable energy and the overall environmental concerns. The urgent call for reducing power consumption while meeting system requirements has motivated increasing research efforts on green radio. In this paper, we investigate a new joint spectrum and power allocation scheme for a cooperative downlink multi-user system using the frequency division multiple access scheme, in which arbitrary M base stations (BSs) coordinately allocate their resources to each user equipment (UE). With the assumption that multi-BS UE (user being served by multi-BS) would require the same amount of spectrum from these BSs, we conclude that when the number of multi-BS UEs is limited by M-1, the resource allocation scheme can always guarantee the minimum overall transmit power consumption while meeting the throughput requirement of each UE and also each BS's power constraint. Then, to decide the clusters of multi-BS UEs and the clusters of individual-BS UEs (users being served by individual BSs), we propose a UE-BS association scheme and a complexity reduction scheme. Finally, a novel joint spectrum and power allocation algorithm is proposed to minimize the total power consumption. Simulation results are presented to verify the optimality of the derived schemes.
Impedance analyser module for EIT and spectroscopy using undersampling (2001)

In this paper we present the concept, the design and the test procedure for a DSP-based high-precision and high-performance wide-band (up to 10 MHz) bioimpedance analyser module for application in EIT or bioimpedance spectroscopy. The module implements a digital concept with appropriate signal conditioning hardware for voltage and current measurement, early signal digitization and subsequent digital signal processing in order to calculate the components of impedance (or admittance). At low frequencies, the module utilizes the conventional direct conversion method, whereas at high frequencies the undersampling technique is used. The advantages of the described system are the following: (a) the frequency range is extended to higher frequencies, (b) the number of data sampled per time interval is significantly reduced, and (c) the current consumption and the costs of the ADCs can be significantly reduced. The validation procedure is performed by comparing the measured and theoretical values of the magnitude and the phase of the impedance for a commonly used tissue model. The module offers an accuracy of better than 0.012% for the magnitude of impedance and better than 0.02 degrees for the phase.
An integrated TIN and Grid method for constructing multi‐resolution digital terrain models (2005)

Multi‐resolution terrain models are an efficient approach to improve the speed of three‐dimensional (3D) visualizations, especially for terrain visualization in Geographical Information Systems (GIS). As a further development to existing algorithms and models, a new model is proposed for the construction of multi‐resolution terrain models in a 3D GIS. The new model represents multi‐resolution terrains using two major methods for terrain representation: Triangulated Irregular Network (TIN) and regular grid (Grid). In this paper, first, the concepts and formal definitions of the new model are presented. Second, the methodology for constructing multi‐resolution terrain models based on the new model is proposed. Third, the error of multi‐resolution terrain models is analysed, and a set of rules is proposed to retain the important features (e.g. boundaries of man‐made objects) within the multi‐resolution terrain models. Finally, several experiments are undertaken to test the performance of the new model. The experimental results demonstrate that the new model can be applied to construct multi‐resolution terrain models with good performance in terms of time cost and maintenance of the important features. Furthermore, a comparison with previous algorithms/models shows that the speed of rendering for 3D walking/flying through has been greatly improved by applying the new model.
INDUCTION OF BONE MARROW COLONY-STIMULATING ACTIVITY BY A FILTERABLE AGENT IN LEUKEMIC AND NORMAL MOUSE SERUM (1968)

1. Leukemic Swiss mice of ICR/Ha strain which had been injected at birth with a lymphoid-leukemia-inducing virus preparation yielded sera which produced elevations of serum colony-stimulating activity within 16 hr and significant plasma-LDH-enzyme elevation at 4 days when injected intraperitoneally into normal ICR/Ha Swiss mice. Colony-stimulating activity was assayed in vitro by the stimulation of hemopoietic colony formation by DBA/1 bone marrow cells. 2. The inducing agent in leukemic serum was passageable, filterable, sedimentable, and heat-, ether-, and UV-labile. 3. A similar agent was recovered from normal Swiss serum after blind serial passages through normal mice. 4. LDH elevating virus induced a similar elevation of serum colony-stimulating activity when injected at high titers, and cross-resistance was demonstrated between LDH virus and the passaged leukemic serum agent.
Reshaping Light-Emitting Diodes To Increase External Efficiency (1995)

Light-emitting diodes (LEDs) reshaped, according to proposal, increasing amount of light emitted by decreasing fraction of light trapped via total internal reflection. Results in greater luminous output power for same electrical input power; greater external efficiency. Furthermore, light emitted by reshaped LEDs more nearly collimated (less diffuse). Concept potentially advantageous for conventional red-emitting LEDs. More advantageous for new blue LEDs, because luminous outputs and efficiencies of these devices very low. Another advantage, proposed conical shapes achieved relatively easily by chemical etching of semiconductor surfaces.
Electrophoretic Analysis of a Gastric Cancer-Associated Acid Proteinase Using a Highly Sensitive Detection System. (1994)

A highly sensitive detection system for acid proteinase separated on polyacrylamide gel was established. This system consisted of two-dimensional electrophoresis, combined with isoelectric focusing and polyacrylamide gel electrophoresis, and casein clotting (caseogram). Human urine, serum and gastric tissues obtained from normal individuals and gastric cancer patients were analyzed using this system. The previous electrophoretic method was not sufficiently sensitive to detected small amounts of pepsinogen (PG) C in normal urine. However, the new rapid and sensitive method clearly revealed its presence. In gastric tissue containing cancer cells, an additional proteinase, which was not present in normal tissue, was detected and named medium moving proteinase (MMP). MMP resembled PGs in alkaline stability rather than the non-PG proteinase, slow moving proteinase (SMP).
Interplay between Auger and Ionization Processes in Nanocrystal Quantum Dots (2005)

We study the interplay between Auger effects and ionization processes in the limit of strong electronic confinement in core/shell CdSe/ZnS semiconductor nanocrystal quantum dots. Spectrally resolved fluorescence decay measurements reveal a monotonic increase of the photoluminescence decay rate on excitation density. Our results suggest that Auger recombination accelerates ionization processes that lead to the occupation of dark, nonemissive nanocrystal states. A model is proposed in the quantized Auger regime describing these experimental observations and providing an estimate of the Auger assisted ionization rates.
Realtime depression estimation using mid-term audio features (2014)

This paper presents a method towards estimating a clinical depression-specific score, namely the Beck Depression Inventory (BDI) score, based on analysis of mid-term audio features. A combination of support vector machines and semi-supervised learning has been applied to map the mid-term features to the BDI score. The method has been evaluated on the AVEC 2013 depression dataset. The overall system has been implemented in Python achieving a 20xrealtime computational complexity on an average computer.
A deep learning MRI approach outperforms other biomarkers of prodromal Alzheimer’s disease (2022)

The advantages of using deep learning to extract biomarker information from conventional MRIs extend practically, potentially reducing patient burden, risk, and cost.
Data networks reliability (1988)

The research from 1984 to 1986 on Data Network Reliability had the objective of developing general principles governing the reliable and efficient control of data networks. The research was centered around three major areas: congestion control, multiaccess networks, and distributed asynchronous algorithms. The major topics within congestion control were the use of flow control algorithms. The major topics within congestion control were the use of flow control to reduce congestion and the use of routing to reduce congestion. The major topics within multiaccess networks were the communication properties of multiaccess channels, collision resolution, and packet radio networks. The major topics within asynchronous distributed algorithms were failure recovery, time vs. communication tradeoffs, and the general theory of distributed algorithms.
The influence of elastin degradation products, glucose and atorvastatin on metalloproteinase-1, -2, -9 and tissue inhibitor of metalloproteinases-1, -2, -3 expression in human retinal pigment epithelial cells. (2014)

Our results confirm the importance of MMPs and TIMPs in retinal vascular biology. Atorvastatin-induced MMPs gene expression can deeply affect extracellular matrix turnover, which may play an important role in the progression of ocular diseases.
Front Cover Advanced Materials 1–2/2012 (2012)

The cover illustrates a new synthetic strategy to prepare biobased engineering elastomer (BEE), which might be a substitute for some traditional synthetic rubber, from renewable biomass feedstock, and a reduced cost approach to fabricate the BEE nanocomposites as well as some final products made from BEE. Further details can be found in the article by P. Coates et. al. on page 112.
Electrochemistry of Hypochlorite at Silicon in Alkaline Etchantsm: Applications in Device Fabrication (2001)

Electrochemical reduction of hypochlorite at silicon in alkaline solution occurs via a two-step mechanism. The first step involving a conduction band electron gives an intermediate which subsequently injects a hole into the valence band. As a result, photocurrent doubling is observed with the p-type semiconductor. reacts chemically with silicon at a rate which is constant for potentials more negative than the open-circuit value. It is shown that can be used to control the surface morphology of silicon during chemical etching in alkaline solution. In addition, is a suitable oxidizing agent for achieving a galvanic etch stop in beam and membrane fabrication. © 2001 The Electrochemical Society. All rights reserved.
The gem-Dimethyl Effect in Thiacyclodecanes (1962)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe gem-Dimethyl Effect in ThiacyclodecanesPaul Friedman and Paul Allen Jr.Cite this: J. Org. Chem. 1962, 27, 3, 1095–1096Publication Date (Print):March 1, 1962Publication History Published online1 May 2002Published inissue 1 March 1962https://pubs.acs.org/doi/10.1021/jo01050a546https://doi.org/10.1021/jo01050a546research-articleACS PublicationsRequest reuse permissionsArticle Views54Altmetric-Citations7LEARN 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
ChemInform Abstract: Discovery of an Imidazopyridine‐Containing 1,4‐Benzodiazepine Nonpeptide Vitronectin Receptor (αvβ3) Antagonist with Efficacy in a Restenosis Model. (1999)

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.
Detection of oncogene mutation from neoplastic colonic cells exfoliated in feces (1996)

These preliminary findings show a high rate of accuracy in the investigation of K-ras alterations in the colorectal cells shed into the feces, suggesting that such an approach could be used to study other gene alterations and, prospectively, to identify early colorectal cancers.
Pamidronate Attenuates Oxidative Stress and Energetic Metabolism Changes but Worsens Functional Outcomes in Acute Doxorubicin-Induced Cardiotoxicity in Rats (2016)

Despite its ability to reduce oxidative stress and improve energy metabolism in the heart, pamidronate worsened systolic function in rats treated with doxorubicin, and therefore we cannot recommend its use in conjunction with anthracycline chemotherapy.
Observation of the phase formation in Fe–N films deposited by reactive pulsed laser deposition (2003)

Fe–N films have been grown on SiO2/Si(100) substrates by reactive pulsed laser deposition (PLD). A series of films was deposited at 20 °C and at 250 °C, with a wide range of nitrogen pressures. Both nitrogen pressure and deposition temperature were found to affect the film average compositions, structures, phase percentages, and magnetic properties of the films. The saturation magnetization of the films is shown to depend not only on their average nitrogen content but also on the phases and their relative amounts that make up the films. In particular, the iron nitrides γ′-Fe4N, and ε-Fe3N (which has a wide range of composition) play a major role in determining the magnetization. Results can be understood in terms of the relative contributions of the deposition rate and atomic surface diffusion in producing thin-film structure. To date, no giant moments larger than Ms of pure Fe have been observed in this investigation.
Specifications for germanium radiation detectors used for gamma-ray assay in safeguards applications (1978)

Nondestructive assay by gamma-ray spectroscopy is one of the preferred methods of nuclear material inventory. Germanium diodes are currently some of the most useful detectors available to carry out this work. This usefulness is due to the high resolution and relative efficiency of the devices. We investigated the current state of affairs of both high-purity and lithium-drifted germanium diode technology. In this report, we discuss the physics and engineering of detector fabrication and operation and the basic principles of assay by gamma-ray spectroscopy. Finally, we discuss the trade-offs for detectors used in several general assay categories, and we examine the electronics and systems used to process the detector outputs. Since we found no ideal system for all situations, we have listed the various specifications parameters, explained their meanings, and discussed their relevant trade-offs.
Analysis of camshaft control in unconventional combustion engine (2018)

For the simulation there was created model of Szymkowiak’s engine and it’s version with modified swing arm, in Autodesk Inventor. Dynamic simulation of piston movement has been made for both engines with selected compression ratios. Results of piston movement has been used to create simulation of combustion process in AVL Fire. Simulation for both engines has been made for the same boundary conditions.
Reversing the Enantioselectivity of a Peptidic Catalyst by Changing the Solvent (2011)

The enantioselectivity of the peptidic catalyst H-Pro-Pro-Asp-NH(CH2)11CH3 is reversed in different solvents. One enantiomer forms preferentially in pure DMSO or MeOH, whereas the other is preferentially formed in mixtures of water with DMSO or MeOH.
Calculation of the negative refractive index of a LHM slab by the free-space mapping of the laterally shifted refracted beam (2006)

In this paper, we present a novel method to calculate the effective negative refractive index of a left-handed material (LHM)—a composite of split-ring resonators (SRRs) and thin wire structures. A LHM slab was first fabricated and then the measured transmission and reflection results were used to determine the LHM passband. To obtain the effective negative-refractive index, a microwave beam was obliquely launched to illuminate the slab for which a 2D spatial-field profile of the refracted beam outside the slab was obtained by scanning the lateral shifting of the field with respect to normal for a band of frequencies. A lateral shift of the refracted beam towards the same side of the incident beam for the LHM passband confirmed negative refraction in the LHM slab and the refractive index calculated for that frequency region was conclusively negative according to Snell's law. The presented method provides an alternate and efficient way to measure the effective refractive index of a LHM. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 593–596, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21417
Selection of Critical Load Cases using an Artificial Neural Network Approach for Reserve Factor Estimation (2015)

During aircraft preliminary design the selection of load conditions can affect the results of the structural sizing and therefore affect the component weights. After the computation of ground, maneuver and gust cases based on a 1-dimensional condensed aircraft model the most critical load conditions are selected using external load distribution. These external loads are computed at discrete load monitoring stations thanks to the response of the aircraft model. The external loads are then distributed to the loadable grids of a global finite element model for stress analysis, structural sizing and weight estimation. In order to reduce the amount of load cases for analysis the most relevant load cases are selected based on external load criteria. The choice of these criteria is then essential for the design of a safe structure. The present study proposes a selection of load conditions which is based on reserve factor values which are available at the sizing process. The iterative sizing process includes an update of the structural properties for the strength analysis during each loop. In the scope of this study one set of structural parameters together with existing reserve factor values are taken from one sizing loop. Thus the strength analysis is replaced by a surrogate model which is constructed using an artificial neural networks approach. The construction and accuracy of the surrogate model is discussed and a comparison of both load case selection approaches is performed. The study is performed for the wing covers of a backward swept metallic wing. The results show that a further reduction of the selected load cases by SMT values is possible when taking the reserve factor values into account. The constructed surrogate model is a first step for future surrogate based optimization by which the sizing and weight estimation of the wing covers can be performed with cheap function evaluations.
Activation effect of alkoxysilanes as external donors in magnesium chloride-supported Ziegler-Natta catalysts (1992)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTActivation effect of alkoxysilanes as external donors in magnesium chloride-supported Ziegler-Natta catalystsMaria Carmela Sacchi, Fabrizio Forlini, Incoronata Tritto, Raniero Mendichi, Giulio Zannoni, and Luciano NoristiCite this: Macromolecules 1992, 25, 22, 5914–5918Publication Date (Print):October 1, 1992Publication History Published online1 May 2002Published inissue 1 October 1992https://doi.org/10.1021/ma00048a009RIGHTS & PERMISSIONSArticle Views536Altmetric-Citations74LEARN 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 InReddit PDF (627 KB) Get e-Alerts Get e-Alerts
Evolution of grain size distribution during deformation of superplastic materials (1997)

Grain size distribution and its evolution during superplastic deformation has been studied for two materials- ultrahigh carbon steel, which has a two phase microstructure, and a copper alloy, which has a quasi-single phase microstructure. For both materials the distribution of initial grain size is very accurately represented by a lognormal throughout the deformation history. The evolution of the parameters characterizing the log normal distribution have also been studied and found to vary in a systematic manner results. Results can be used to specify the grain size distribution as a function of strain during superplastic deformation and thus should prove useful for computational studies in which grain size distribution is evaluated.