gebhart/patrepeval huggingface dataset:
Use of <i>m</i> -sequences for OFDM peak-to-averagepowerratio reduction (1997)

A block coding scheme has previously been proposed using maximal-length sequences to reduce the peak-to-average power ratio (PAP) for orthogonal frequency division multiplexing (OFDM). It has also been claimed that PAP can be limited to the range 0.08 – 0.6 dB for some m-sequences. These numbers are incorrect and m-sequences can only yield PAP values in the range 5 – 7 dB.
Effects of postconditioning with N,N,N'N'-tetrakis-[2-pyridylmethyl]-ethylenediamine in isolated rat hearts (2010)

Background: It was reported that N,N,N'N'-tetrakis-[2-pyridylmethyl]-ethylenediamine (TPEN), a transition metal chelator, confers cardioprotection against myocardial ischemic injury. In this study, we investigated the effect of TPEN targeting reperfusion period in isolated rat hearts.
Los horticultores de la Sabana Centro de Cundinamarca no tienen una organización moderna (2006)

¿Cómo hacer para que un grupo de cultivadores de hortalizas cambien de una estructura de subsistencia a organización. ¿En forma de conglomerado como una red de productores que garantice una oferta de calidad nacional e internacional? En este artículo se resume la metodología aplicada y los principales resultados obtenidos, gracias a la aplicación de herramientas de prospectiva, así como análisis de modelos de redes económicas, teorías de dinámica empresarial, estudio de variables de entorno nacional y de tendencias internacionales sobre los productos hortícolas y en una región seleccionada como fueron los municipios de la provincia de Sabana Centro en Cundinamarca.
Encoding the location of spectral coefficients using quadtrees in transform image compression (2003)

A transform image coding method is presented. A discrete cosine transform (DCT) is performed on blocks of 16*16 size. A threshold mask is applied by using a fixed threshold determined by the statistical properties of the DCT coefficients. Selected coefficients are coded with a Huffman code. Three methods for coding the threshold mask are compared. zigzag, orthogonal, and quadtree scan. Three Huffman code tables are presented for coding the runlengths of zeros. A high-quality decoded image is shown at 1 bit/pixel.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
Interaction modes between heavy metal ions and water-soluble polymers. 1. Spectroscopic and magnetic reexamination of the aqueous solutions of cupric ions and poly(vinyl alcohol) (1986)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInteraction modes between heavy metal ions and water-soluble polymers. 1. Spectroscopic and magnetic reexamination of the aqueous solutions of cupric ions and poly(vinyl alcohol)Hiroshi. Yokoi, Satoshi. Kawata, and Masamoto. IwaizumiCite this: J. Am. Chem. Soc. 1986, 108, 12, 3358–3361Publication Date (Print):June 1, 1986Publication History Published online1 May 2002Published inissue 1 June 1986https://pubs.acs.org/doi/10.1021/ja00272a033https://doi.org/10.1021/ja00272a033research-articleACS PublicationsRequest reuse permissionsArticle Views401Altmetric-Citations47LEARN 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
WCDMA receiver architecture with unique frequency plan (2002)

A WCDMA receiver architecture is presented that utilizes the subsampling concept to down-convert the IF signal to a lower IF before being digitized. The receiver does not need an anti-aliasing filter before the ADC, only uses a single path until the ADC and generates the I and Q paths in digital domain to avoid I-Q analog mismatches. This architecture utilizes a bandpass sigma-delta ADC with 55 dB dynamic range.
Technical and project highlights for the Defense Waste Processing Facility (1989)

The Savannah River Plant has been operating a nuclear fuel cycle since the early 1950's. Fuel and target elements are fabricated and irradiated to produce nuclear materials. After removal from the reactors, the fuel elements are processed to extract the products, and the waste is stored in under ground tanks. During approximately thirty-five plus years of operation, about 83 million gallons of high level radioactive waste have been generated. This waste has been reduced to about 33 million gallons by evaporation in the waste tank farms. The Defense Waste Processing Facility (DWPF), nearing completion at Savannah River, will process this waste into a borosilicate glass for long-term geologic disposal. The construction of the DWPF is about 90% complete; this paper will describe the status of the project, including the checkout and run-in of equipment prior to cold runs. 13 refs.
Towards automated network management (2007)

We analyze data from a Tier-1 ISP that reflect the dynamic operational tasks performed in the ISP network to build a holistic view of configuration management operations. We observe that in addition to commands that lead to persistent configuration changes, virtually all management tasks also involve status-checking commands that do not change the configuration, but allow the operator to verify some router specific state. Based on this observation we model configuration modifications using automatically generated deterministic finite automata (DFA), where a state represents the configured behavior of an interface and an edge indicates the operations performed on the interface either to fulfill a specific task or to check the status of the router. The DFA model captures common configuration tasks derived by our analysis and their ordering and dependency. We argue that composing DFAs is a (small) step towards enabling operators to reason about the operational state of the network, as well as enabling tools for automated network management.
A comparison of defect models for fault location with Iddq measurements (2002)

Iddq testing, where quiescent current is measured for a variety of states in static CMOS circuits, has emerged as a useful fault detection technique. In this paper it is shown that Iddq tests may be used for precise diagnosis of defects, using both inter and intra-gate shorts as fault models. The effects of these models are compared, using chips from a standard cell ASIC run. Of the 151 parts in the sample, diagnoses have been obtained from 135 of them. In many of these cases, the predicted defects are confined to a single standard cell.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
Predicted curvatures and stresses in a fiber-optic interconnect subjected to bending (1996)

Simple formulas are obtained for the evaluation of the curvatures and stresses in a fiber-optic interconnect subjected to mechanical bending due to linear and angular misalignments of its end cross-sections. In addition, it is shown how to consider the compression caused by the thermal contraction mismatch of the glass material with the material of the enclosure. The obtained formulas can be helpful when predicting the added transmission losses and the maximum stress in optical interconnects experiencing bending. Particularly, they enable one to establish the allowable misalignments in, and/or the minimum allowable length of, the interconnect, which are permissible from the standpoint of its optical performance and mechanical reliability.
Amniotic fluid index measurement with the four-quadrant technique during pregnancy. (1990)

Eleven hundred thirty-four pregnant women with reliable dates underwent ultrasound evaluation for amniotic fluid index (AFI) measurement with the modified four-quadrant technique. We found that from 13 weeks' gestation the AFI rose progressively until 26 weeks. From then to 38 weeks the AFI measurements demonstrated little variation. After 38 weeks the AFI appeared to decline gradually. In the third trimester the mean AFI was 16.0 +/- 4.8 cm; 5% of cases had an AFI less than or equal to 8 cm, and 5% had an AFI greater than or equal to 24 cm. These results confirm the reproducibility of the semiquantitative technique and suggest that in estimating amniotic fluid volume, AFI measurement may be a more appropriate means than measurement of the single largest pocket or subjective assessment. Serial AFI measurement would be an effective way of assessing fetal status throughout pregnancy.
PROGRESS OF RESEARCH AND DEVELOPMENT ON HIGH-LEVEL RADIOACTIVE WASTE GEOLOGIC DISPOSAL IN JAPAN (2004)

原子力発電に伴って発生する高レベル放射性廃棄物は, 地下深部の岩盤中に埋設処分 (地層処分) される. わが国では, 1999年に核燃料サイクル開発機構が行った研究開発の「第2次取りまとめ」によって地層処分の技術的信頼性が示され, 2000年以降, 法令の整備, 実施主体の設立, 安全規制の枠組み作りが進むなど, わが国の地層処分計画は事業段階に踏み出した. 事業に先行して, 信頼性のさらなる向上を目指した研究開発が着実に進展している.
Low-complexity multi-mode VXC using multi-stage optimization and mode selection (speech coding) (1991)

The authors propose an algorithm in which multi-mode coding is a transparent adaptation of multi-stage VXC (vector excitation coding) requiring almost zero additional computation. In the process, it is shown how the cost of the jointly optimized multi-stage VXC can be minimized using a backward-transform implementation of the perceptually orthogonal VXC (POVXC) algorithm previously proposed by the authors. It is shown that the performance of such a coder, while not as good as that of a normal multi-mode coder, is noticeably better than that of a normal POVXC.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
A call-to-service design for mobile robots using Zigbee sensor networks (2011)

This paper presents a call-to-service design for a walking assistive robot such that it can come and provide assistance to an elderly or handicapped people in an indoor environment. The proposed design integrates a location-aware system and an autonomous navigation system of the mobile robot. A Zigbee-based location-aware system is responsible for estimating the position of user, who calls the robot for service. The autonomous navigation system takes the location information as input and moves towards the user upon calling. Three navigation behaviors are designed by using fuzzy logic approach. The outputs of these behaviors are fused to determine the motion of the robot using a neural network. The call-to-service system has been implemented on a walking helper robot (Walbot) to enhance its capability of human-robot interaction. Experimental results show that, with a location estimation error of 0.41m, the developed system demonstrates satisfactory call-to-service performance.
Level-set segmentation of brain tumors in magnetic resonance images (2008)

Master's
Receptor-mediated activation of a Cl(-) current by LPA and S1P in cultured corneal keratocytes. (2002)

These results demonstrate that activation of ICl(LPA) by LPA in cultured corneal keratocytes is receptor mediated and that ICl(LPA) can also be activated by S1P. From a functional standpoint, this work confirms that the current, which is typically thought of as purely volume-activated, can be activated through a receptor. In addition, activation of ICl(LPA) results in depolarization of the keratocyte. Finally, this work demonstrates that cultured corneal keratocytes can act as a model for the study of ion channel function in keratocytes during corneal wound healing.
A computational model for tympanometry (1996)

A computational model for tympanometry was developed by describing the ear canal with the impedance theory of a tube and by representing the middle ear with the Zwislocki electroacoustic analog. Changes in ear-canal length and acoustic properties of the middle ear with ear-canal pressures during a tympanometric procedure were mimicked by manipulating relevant model parameters. Tympanograms of different patterns of the normal ear and the ear with a disarticulation of the ossicular chain were reproduced with the model and were in agreement with experimental observations reported by other investigators. The model demonstrated the relationship between various patterns of admittance tympanograms and middle ear impedance predicted by the Vanhuyse theory. The effects of the ear canal on the estimates of middle ear admittance using compensation procedures for ear-canal volume were also predicted with the model. The model can provide a better understanding of the mechanism of tympanometry and a framework for further modeling study.
51.1-Tbit/s MCF Transmission over 2,520 km Using Cladding Pumped 7-core EDFAs (2015)

We demonstrate 51.1-Tb/s multi-core fiber transmission using cladding pumped 7-core EDFAs and confirmed a reachable distance of 2,520 km with 73 × 100-Gbit/s Nyquist-pulse-shaped DP-QPSK signals per core.
A Multiobjective Evolutionary Algorithm Based on Decision Variable Analyses for Multiobjective Optimization Problems With Large-Scale Variables (2015)

State-of-the-art multiobjective evolutionary algorithms (MOEAs) treat all the decision variables as a whole to optimize performance. Inspired by the cooperative coevolution and linkage learning methods in the field of single objective optimization, it is interesting to decompose a difficult high-dimensional problem into a set of simpler and low-dimensional subproblems that are easier to solve. However, with no prior knowledge about the objective function, it is not clear how to decompose the objective function. Moreover, it is difficult to use such a decomposition method to solve multiobjective optimization problems (MOPs) because their objective functions are commonly conflicting with one another. That is to say, changing decision variables will generate incomparable solutions. This paper introduces interdependence variable analysis and control variable analysis to deal with the above two difficulties. Thereby, an MOEA based on decision variable analyses (DVAs) is proposed in this paper. Control variable analysis is used to recognize the conflicts among objective functions. More specifically, which variables affect the diversity of generated solutions and which variables play an important role in the convergence of population. Based on learned variable linkages, interdependence variable analysis decomposes decision variables into a set of low-dimensional subcomponents. The empirical studies show that DVA can improve the solution quality on most difficult MOPs. The code and supplementary material of the proposed algorithm are available at <uri xlink:type="simple" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">http://web.xidian.edu.cn/fliu/paper.html</uri> .
NbF<sub>5</sub>: A Novel α‐Phase Stabilizer for FA‐Based Perovskite Solar Cells with High Efficiency (2019)

Abstract The HC(NH 2 ) 2 + (FA + ) is a well‐known substitute to CH 3 NH 3 + (MA + ) for its capability to extend light utilization for improved power conversion efficiency for perovskite solar cells; unfortunately, the dark cubic phase (α‐phase) can easily transition to the yellow orthorhombic phase (δ‐phase) at room temperature, an issue that prevents its commercial application. In this report, an inorganic material (NbF 5 ) is developed to stabilize the desired α‐phase perovskite material by incorporating NbF 5 additive into the perovskite films. It is found that the NbF 5 additive effectively suppresses the formation of the yellow δ‐phase in the perovskite synthesis and aging process, thus enhancing the humidity and light‐soaking stability of the perovskite film. As a result, the perovskite solar cells with the NbF 5 additive exhibit improved air stability by tenfold, retaining nearly 80% of their initial efficiency after aging in air for 50 d. In addition, under full‐sun AM 1.5 G illumination of a xenon lamp without any UV‐reduction, the perovskite solar cells with the NbF 5 additive also show fivefold improved illumination stability than the control devices without NbF 5 .
Un monocromador de fotones para la radiación de ”Bremsstrahlung” del Betatron (2009)

A NEW INSTRUMENT WAS DEVELOPED IN ORDER TO SORT OUT MONOCHROMATIC X RAYS OF HIGH ENERGY FROM THE CONTINUOUS BREMSSTRABLUNG SPECTRUM OF A 22 MeV BETATRON; THE RESOLUTION OF THE INSTRUMENT WAS OF THE ORDER OF 2%. MEASUREMENTS WERE MADE OF TOTAL ELECTRONIC ABSORPTION COEFFICIENT IN CARBON IN THE ENERGY INTERVAL 14.5 - 16.5 MeV; A GOOD AGREEMENT WITH THEORY WAS OBTAINED.
Intraoperative ultrasonographic evaluation of the ascending aorta in 100 consecutive patients undergoing cardiac surgery. (1991)

Dislodgement of atheromatous plaque from the ascending aorta following manipulation is one of the principal causes of stroke following cardiac surgery. To define clinical correlates that predict the presence of severe atherosclerosis, we performed ultrasonographic evaluation of the ascending aorta at the time of cardiac surgery in 100 consecutive patients. The ascending aorta was divided into three equal segments for analysis, and the severity of atherosclerosis was determined as mild when intimal thickening (less than 3 mm) was localized to one segment, moderate when intimal thickening (greater than 3 mm) was present in one or two segments, and severe when intimal thickening (greater than 3 mm) was present throughout the entire circumference in all three segments. Thirty-eight percent of the studies were normal, mild atherosclerosis was present in 33%, moderate atherosclerosis in 19%, and severe atherosclerosis in 10% of the patients. Palpation of the ascending aorta to detect atherosclerosis significantly underestimated the presence (p less than 0.001) and severity (p less than 0.001) of atherosclerosis when compared with ultrasonography. Age, carotid artery disease, diabetes, gender, smoking, and hypertension were evaluated for their ability to discriminate between normal and severely atherosclerotic aortas. Stepwise logistic regression analysis showed age (p less than 0.02) and diabetes (p less than 0.04) to be significant independent predictors of the presence of severe atherosclerosis in the ascending aorta. Based on the ultrasonographic findings, the operative procedure was altered to reduce the risk of embolization in 17% of the patients. We conclude that high-resolution images of the ascending aorta for identification of atherosclerosis can be obtained by ultrasonography.(ABSTRACT TRUNCATED AT 250 WORDS)
Drugs in autoimmune diseases. (1990)

Autoimmune diseases arise when autoimmunity or the loss of self tolerance results in tissue damages. Many mechanisms have been proposed for the origin of autoimmunity, including immunologic, viral, hormonal and genetic factors. All known parts of the immunological network are involved in causing immunopathologic symptoms. Therefore, more or less specific immunosuppressants are widely used in the treatment of autoimmune disorders which range from organ-specific, i.e. Hashimoto's thyroiditis, to non-organ-specific or systemic diseases, i.e. systemic lupus erythematosus. Unspecifically acting cytostatics do not only suppress autoimmune reactions but also create severe side-effects due to the impairment of immune responses against foreign antigens, leading, for example, to an increased risk of infections. Moreover, the genotoxic activity of cytostatics might induce malignancies. Corticosteroids are clinically well known and very active agents for the management of acute symptoms but different side-effects limit their use in the treatment of chronic diseases. Cyclosporin A has been an important step forward to a more specific prevention of organ transplant rejections and to the therapy of some autoimmune disorders. Modern approaches to immunosuppression include monoclonal antibodies directed against a variety of different determinants on immunocompetent cells. Ciamexone and Leflunomide which are in early clinical and preclinical development, respectively, might be interesting new drugs. Future immunopharmacologic drug research and development should lead to more specific, low molecular weight, orally active and chemically defined immunosuppressive compounds with good tolerability under long-term treatment of autoimmune diseases.
An energy-efficient virtual memory system with flash memory as the secondary storage (2006)

The traditional virtual memory system is designed for decades assuming a magnetic disk as the secondary storage. Recently, flash memory becomes a popular storage alternative for many portable devices with the continuing improvements on its capacity, reliability and much lower power consumption than mechanical hard drives. The NAND flash memory is organized with blocks, and each block contains a set of pages. The characteristics of flash memory are quite different from a magnetic disk. Therefore, in this paper, we revisit virtual memory system design considering limitations imposed by flash memory. In particular, we study the effects of the subpaging technique and storage cache management. In the traditional virtual memory system, a full page is written back to the secondary storage on a page fault. We found that this could result in unnecessary writes thereby wasting energy. The subpaging technique that partitions a page into subunits, and only dirty subpages are written to flash memory is beneficial to the energy efficiency. For the storage cache management, unlike traditional disk cache management, care needs to be taken to guarantee that the flash pages of a main memory page are replaced from the cache in sequence. Experimental results show that the average energy reduction of combined subpaging and caching techniques is 35.6%.