gebhart/patrepeval huggingface dataset:
Interactive Search by Direct Manipulation of Dissimilarity Space (2007)

In this paper, we argue to learn dissimilarity for interactive search in content based image retrieval. In literature, dissimilarity is often learned via the feature space by feature selection, feature weighting or by adjusting the parameters of a function of the features. Other than existing techniques, we use feedback to adjust the dissimilarity space independent of feature space. This has the great advantage that it manipulates dissimilarity directly. To create a dissimilarity space, we use the method proposed by Pekalska and Duin, selecting a set of images called prototypes and computing distances to those prototypes for all images in the collection. After the user gives feedback, we apply active learning with a one-class support vector machine to decide the movement of images such that relevant images stay close together while irrelevant ones are pushed away (the work of Guo ). The dissimilarity space is then adjusted accordingly. Results on a Corel dataset of 10000 images and a TrecVid collection of 43907 keyframes show that our proposed approach is not only intuitive, it also significantly improves the retrieval performance.
Laser Surface Smoothing of Nickel-based Superalloys (2013)

The effect of continuous wave (CW) Nd:YAG laser remelting on the surface topography of two different nickel based superalloys is studied in this work. A bidirectional strategy with small overlapping between adjacent tracks, together with powers around 150W and speeds over 4m/min is found to perform best. The most relevant 1D statistical parameters are obtained via contact profilometry and complemented by confocal microscopy measurements. The results show a notable improvement of about 80% on the Ra parameter, which is reduced from 4-5 μm to values around 1 μm. The potential of the technique is demonstrated on 3D parts.
Reduction of Dislocation Density in GaAs/Si by Strained-Layer Superlattice of In<sub>x</sub>Ga<sub>1-x</sub>As-GaAs<sub>y</sub>P<sub>1-y</sub> (1987)

Dislocation density in GaAs layers grown on Si substrates has been investigated by measuring in-depth profile of the etch pit density (EPD) using a molten KOH. Reduction of EPD into 10 7 cm -2 level for the layer of 2-3 µm thickness is attained by the post annealing at 900°C for 30 min. Further reduction of dislocation has been achieved using In x Ga 1- x As-GaAs y P 1- y strained-layer superlattices (SLS's); step-like reduction of the dislocation at the SLS's and its continuous decrease even passing through the SLS's have been observed.
Mechanism of action of SNF472, a novel calcification inhibitor to treat vascular calcification and calciphylaxis (2020)

These experiments show that SNF472 binds to HAP and inhibits further HAP crystallization. The EC<sub>50</sub> for chelation of free calcium is 50-fold greater than a maximally effective SNF472 dose, supporting the selectivity of SNF472 for HAP. These findings indicate that SNF472 may have a future role in the treatment of vascular calcification and calcific uraemic arteriolopathy in patients undergoing dialysis.
Bandpass pulse-width modulation (BP-PWM) (2005)

New transmitter architectures utilizing nonlinear power amplifiers when transmitting linearly modulated signals are studied. The emphasis is on bandpass pulse-width modulation (BP-PWM) for which both theory and implementation proposals are presented.
Meiosis: how could it work? (1996)

A physical connection between homologs is required for reductional segregation at the first division of meiosis. This connection is usually provided by one or a few well-spaced crossovers. A speculative overview of processes leading to formation of these crossovers is presented.
Miniaturized Quartz Waveguide Filter using Double-Folded Structure (2019)

A miniaturized 28 GHz quartz waveguide bandpass filter using a double-folded structure has been developed. The double-folded structure is used for a footprint reduction less than half of a current single-folded quartz waveguide filter. Some analyses using EM simulation were carried out for studying an electromagnetic coupling between the waveguide resonators. For the double-folded structure, an inductive coupling is appropriate for a main coupling in the vertical direction. The fabricated filter, an 8-pole Chebyshev BPF, has a size of 6.9 × 7.2 × 3.1 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> and measured insertion loss was very low such as 0.74 dB which is same as the current single-folded type. Besides, an 8-pole quasi-elliptic BPF was simulated and its attenuation performance was remarkably improved.
Synthesis of New Substituted Calix[4]Arenes and Their Complexes with Iron(III) (1991)

Abstract The synthesis of new substituted calix[4]arenes was investigated to increase their solubility in organic solvents. It was observed that these compounds cannot be prepared from phenols substituted with strong electron withdrawing substi-tuents (e.g., -CN, -NO2) and phenols which have a p-acidic group (e.g., -OH, -COOH), or a p-carboxylate group (e.g., -COONa). These compounds were treated with some transition metal salts (e.g., FeCl3.6H20, CuCl2.2H20, NiCl2.6H20 or CoCl2.6H20). But only Fe(III) gave complexes with the compounds and the complexes have a metal-ligand ratio of 1:1. Elemental analyses, 1H-NMR and IR data of the new compounds are given. It was concluded that these compounds can be used as organic precipitating reactive for iron(III).
Collaborative filtering over distributed environment (2005)

Abstract. Currently, implementations of the Collaborative Filtering (CF) algorithm are mostly centralized. Hence, information about the users, for example, product ratings, is concentrated in a single location. In this work we propose a novel approach to overcome the inherent limitations of CF (sparsity of data and cold start) by exploiting multiple distributed information repositories. These may belong to a single domain or to different domains. To facilitate our approach, we used LoudVoice, a multi-agent communication infrastructure that can connect similar information repositories into a single virtual structure called &amp;quot;implicit organization&amp;quot;. Repositories are partitioned between such organizations according to geographical or topical criteria. We employ CF to generate user-personalized recommendations over different data distribution policies. Experimental results demonstrate that topical distribution outperforms geographical distribution. We also show that in geographical distribution using filtering based on social characteristics of the users improves the quality of recommendations. 1
Methods and devices for measuring arterial compliance in humans (2002)

This review analyses methods and devices used worldwide to evaluate the arterial stiffness. Three main methodologies are based upon analysis of pulse transit time, of wave contour of the arterial pulse, and of direct measurement of arterial geometry and pressure, corresponding to regional, systemic and local determination of stiffness. They are used in clinical laboratory and/or in clinical departments. Particular attention is given to the reproducibility data in literature for each device. This article summarizes the discussion of the dedicated Task Force during the first Conference of Consensus on Arterial Stiffness held in June 2000 (Paris, France).
Highly enantioselective hydrosilylation of ketones with chiral and C2-symmetrical bis(oxazolinyl)pyridine-rhodium catalysts (1991)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHighly enantioselective hydrosilylation of ketones with chiral and C2-symmetrical bis(oxazolinyl)pyridine-rhodium catalystsHisao Nishiyama, Manabu Kondo, Takashi Nakamura, and Kenji ItohCite this: Organometallics 1991, 10, 2, 500–508Publication Date (Print):February 1, 1991Publication History Published online1 May 2002Published inissue 1 February 1991https://pubs.acs.org/doi/10.1021/om00048a029https://doi.org/10.1021/om00048a029research-articleACS PublicationsRequest reuse permissionsArticle Views3284Altmetric-Citations317LEARN 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-AlertscloseSupporting Info (1)»Supporting Information Supporting Information Get e-Alerts
Infrared Difference Spectra of the Intermediates L, M, N, and O of the Bacteriorhodopsin Photoreaction Obtained by Time-Resolved Attenuated Total Reflection Spectroscopy (1997)

Attenuated total reflection spectroscopy, where precise control of external parameters is feasible, was combined with the step-scan technique, which provides time-resolved Fourier transform-infrared spectra with microsecond time resolution. The advantages of this new approach were demonstrated by analyzing the photoreaction of the membrane protein bacteriorhodopsin (BR). By variation of temperature and pH clear-cut separation of the intermediate states L, M, N, and O, was achieved while previous infrared studies failed to separate the O intermediate in the wild-type. Therefore, we focused on a detailed description of the O−BR difference spectrum. It was proved that the major changes in secondary structure of BR are reversed in the N to O transition. Bands at 1432 and 1448 cm-1 were tentatively assigned to CH3 deformation vibrations of the retinal chromophore in the O state. At 1713 cm-1 the protonation of a carboxylic amino acid during the lifetime of O was observed. In addition to the wild-type data, the long-lived O intermediate of the E204Q and the E204T mutant have been investigated.
Identification of Vacancy-Impurity Complexes in Highly<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">n</mml:mi></mml:math>-Type Si (1999)

We show that the detailed atomic structure of vacancy-impurity complexes in Si can be experimentally determined by combining positron lifetime and electron momentum distribution measurements. The vacancies complexed with a single impurity, $V\ensuremath{-}\mathrm{P}$ and $V\ensuremath{-}\mathrm{As}$, are identified in electron irradiated Si. The formation of native vacancy defects is observed in highly As-doped Si at the doping level of ${10}^{20}{\mathrm{cm}}^{\ensuremath{-}3}$. The defects are identified as monovacancies surrounded by three As atoms. The formation of a $V\ensuremath{-}{\mathrm{As}}_{3}$ complex is consistent with the theoretical descriptions of As diffusion and electrical deactivation in highly As-doped Si.
Cyclotron Production of 68Ga using a natZn-based liquid target (2013)

Dissertação de Mestrado Integrado em Engenharia Biomédica apresentada à Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Blockchain in Education (2017)

This report introduces the fundamental principles of the Blockchain focusing on its potential for the education sector. It explains how this technology may both disrupt institutional norms and empower learners. It proposes eight scenarios for the application of the Blockchain in an education context, based on the current state of technology development and deployment.
Use of power factor and specific point energy as design parameters in laser powder-bed-fusion (L-PBF) of AlSi10Mg alloy (2019)

The densification mechanism in L-PBF of AlSi10Mg alloy with varying process parameters has been investigated. The suitability of using volumetric [Jmm−3], areal [Jmm−2] and linear [Jmm−1] energy density as design parameters is discussed. To compare process conditions between continuous and pulsed laser systems, the jump speed vj of a pulsed L-PBF system is calculated by means of an experimentally validated FE thermal model previously developed at TWI. The importance of using vj in scan speed calculations is demonstrated. This allowed calculation of accurate energy levels comparable to optimal conditions reported in literature. The power factor (PF) model and the specific point energy (ESP), used to describe and replicate the laser welding process in different laser systems, have been adapted to describe the L-PBF process. ESP - PF curve is introduced, showing optimal processing windows applicable to different L-PBF systems with powers ranging from 175 to 967 W and laser focus diameter from 75 to 300 μm. Quantitative indicators for hatch spacing and layer thickness optimisation are presented for processing AlSi10Mg alloy: 1) melt-width overlapping coefficient ≥ 30%, 2) width-to-depth ratio ≥ 0.8 (using the measured half width) and 3) melt-depth limit <410 μm.
Organizational cynicism and employee turnover intention: Evidence from banking sector in Pakistan (2014)

The idea of the research study is to examine the effect of organizational cynicism (OC) on employee turnover intention (TI). The literature on organizational cynicism and turnover intention demonstrates that cynicism has profound effects on turnover intention. Further the influence of job satisfaction (JS) and intrinsic motivation (IM) as mediating variables were also investigated. The data was gathered through self-administered questionnaire from 250 employees functioning on various positions in domestic private sector banks from two cities of Pakistan (Rawalpindi/Islamabad). The findings of survey concluded that Job satisfaction and intrinsic motivation partially mediates the relationship between organizational cynicism and turnover intention. The main limitation of the study is the sample used, that is from the banking segment and from twin cities (Rawalpindi/Islamabad). Self-reported questionnaire data is use as the medium of measurement in the present study. To cope with the challenge management must create an atmosphere within the banks to improve employees' intrinsic motivation to reduce turnover intention. This study may contribute to the knowledge available on cynicism an area that is almost under-research in Pakistan.
On buffer sizing for voice in 802.11 WLANs (2006)

The use of 802.11 to transport delay sensitive traffic is becoming increasingly common. This raises the question of the tradeoff between buffering delay and loss in 802.11 networks. We find that there exists a sharp transition from the low-loss, low-delay regime to high-loss, high-delay operation. Given modest buffering at the access point, this transition determines the voice capacity of a WLAN and its location is largely insensitive to the buffer size used.
Starch‐derived glycol and glycerol glucosides prepared by reactive extrusion processing (1991)

Abstract Previously, starch‐derived glycol and glycerol glucosides were prepared by batch‐reaction processes and had excellent potential as chemical intermediates for a wide range of products. However, more efficient processes for preparation of these derivatives are needed. In this present work, a modern corotating, intermeshing, twin‐screw extruder with a barrel length/screw diameter (L/D) ratio of 43: 1 was used to study the reaction of starch with ethylene glycol and glycerol in the presence of sulfuric acid catalyst at elevated temperatures. A fully continuous process was used. Variables that were investigated included temperature (140–180°C), glycol or glycerol/starch AGU mol ratio (1.5–4.0), starch feed rate (5–30 lb/h), screw speed (100–475 rpm), residence time, specific energy, and several types of commercial cornstarch and corn flour products. Rates and extents of reaction that occurred in the barrel were determined by analyzing samples that were quenched just prior to extrusion. The major glucosides were quentitated by high‐performance liquid chromatography. Results of this study show that starch can be continuously, rapidly, and efficiently converted to glucosides in 90% yield at high production rates. Such processing is expected to be technically feasible for the reaction of a wide range of polyhydroxy alcohols with various starch substrates.
Nucleic Acid Analysis (1999)

ADVERTISEMENT RETURN TO ISSUEReviewNEXTNucleic Acid AnalysisTheodore K. ChristopoulosView Author Information Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario N9B 3P4, Canada Cite this: Anal. Chem. 1999, 71, 18, 425–438Publication Date (Web):September 15, 1999Publication History Published online15 September 1999Published inissue 1 September 1999https://pubs.acs.org/doi/10.1021/a19900161https://doi.org/10.1021/a19900161review-articleACS PublicationsCopyright © 1999 American Chemical SocietyRequest reuse permissionsArticle Views1120Altmetric-Citations66LEARN 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 SUBJECTS:Fluorescence,Genetics,Hybridization,Nucleic acids,Probes Get e-Alerts
Water-Filling Capacity of Wide Band 60GHz Channels with Antenna Directionality (2007)

The 60GHz band is the most attractive candidate for the next generation of very high rate short range communication links. Directional antennas will be used in these systems to compensate for the high path loss at these high frequencies. Antenna directionality heavily affects the observed multipath and consequently the achievable capacity. Many applications that will use these systems only require point-to-point links. Hence, it will be feasible to use channel state information at the transmitter to improve the performance or the data rate. In this paper, we look at the effects of the directional antennas on the water-filling capacity of the wide band 60GHz channels.
Assessment of RF heating by MR-based measurements and models (2016)

RF transmit signals are an inherent part of MRI that is crucial for spin excitation. Current developments in MRI are moving towards higher magnetic field strengths and more transmit coils leading to more inhomogeneous RF distributions. This increases the possibility of SAR hotspots, creating higher risks of local heating. In order to cope with these developments and still perform reliable safety assessments the MRI safety community is discussing to revise the guidelines on RF induced tissue heating. Instead of restricting the scanners on a derived measure, i.e. SAR, the scanners should be limited by the guidelines that are direct measures for tissue damage such as absolute temperature. In this debate the translation from SAR to temperature estimations is crucial. In order to make this translation thermal modeling is required.\nIn this thesis MR-based methods were developed in order to measure the influence of RF exposure in human subjects, both in temperature and perfusion. Those results could subsequently be used to test whether current thermal modeling was able to predict those effects for a given subject. In vivo temperature measurements in the calf resulted in precise representations of the heating that could be used as a reliable gold standard. Furthermore, perfusion increases over the complete leg due to this local temperature\nincrease could be observed. Although the simulations matched with the experiments in the EM regime, the accuracy of the estimated temperature distributions was not sufficient for a safety assessment. This showed that more work on thermal modeling is required before MRI scanners can be restricted on measures based on temperature. Therefore it would be unwise to immediately discard all SAR related restrictions. Local SAR still proved to be a very useful restrictive measure since it can be quickly determined by simulations and can more easily be verified. Correct thermal modeling proved to rely on inputs that are not easily measured such as subject specific thermoregulation. Although the first steps in this direction were made in this thesis, obtaining a proper estimate of thermal behavior over the whole human body is a highly challenging pursuit.
Optimum Steady-State Position and Velocity Estimation Using Noisy Sampled Position Data (1973)

The Kalman filtering technique is used to obtain analytical expressions for the optimum position and velocity accuracy that can be achieved in a navigation system that measures position at uniform sampling intervals of T seconds through random noise with an rms value of σx. A one-dimensional dynamic model, with piecewise-constant acceleration assumed, is used in the analysis, in which analytic expressions for position and velocity accuracy (mean square), before and after observations, are obtained. The errors are maximum immediately before position measurements are made. The maximum position error, however, can be bounded by the inherent sensor error by use of a sufficiently high sampling rate, which depends on the sensor accuracy and acceleration level. The steady-state Kalman filter for realizing the optimum estimates consists of a double integrator, the initial conditions of which are reset at each observation.
An ear-lead ECG based smart sensor system with voice biofeedback for daily activity monitoring (2008)

The computer-based portable devices lead our societies to the world of u-healthcare, so that people may monitor their heart rate outside hospitals. The paper proposes an ultra-wearable smart sensor system combines electrocardiogram (ear-lead ECG), tri-axial accelerometer, and GPS sensors to measure normal or elderly person’s daily activities. The ear-lead makes possible to measure ECG signals without any chest belt or sticky tape. It measures the ECG signals from an ear to an arm. According to our research, the ear-lead is linear combination with regular ECG lead I and III. For most of people, especially, the ear-lead is highly correlated with lead-I ECG. Lead I can be used to detect some life-threatening ECG signals with critical heart rate or morphology changes such as ventricular tachycardia (VT), ventricular flutter (VFL), or ventricular fibrillation (VFib). The hardware of smart sensor integrates a TI MSP430 microprocessor, Bluetooth wireless transmission to PC client software, micro SD card storage, and LCD display. The embedded algorithm combines two sensors for noise reduction and utilizes voice biofeedback for exercise overload warning.