检索结果-南通市图书馆

numerical forecasting surge in a piping of compressor shops of gas pipeline network

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied physics & engineering) 2007年第11期8卷 1775-1788页

作者： SeLeZneV V. e. pRYALOV S. n. physical & Technical Center Joint Stock Company Sarov 607180 Russia

This paper presents a method of forecasting stable operation of gas compressor unit (GCU) centrifugal supercharger (CFS) installed on a piping of compressor shops servicing gas pipelines. The stability of superchargers operation is assessed in relation to the phenomenon of surge. Solution of this problem amounts to the development and numerical analysis of a set of ordinary differential equations. The set describes transmission of gas through a compressor shop as a fluid dynamics model with lumped parameters. The proposed method is oriented to wide application by specialists working in the gas industry. The practical application of this method can use all-purpose programming and mathematical software available to specialists of gas companies.

关键词： Gas pipelines Compressor station Centrifugal supercharger (CFS) Surge numerical simulation

new evidence for enhanced cosmogenic isotope production rate in the atmosphere ≈37 kaBp from the Guliya ice core

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1999年第17期44卷 1616-1620页

作者： L.G.Thompson e.Mosley-Thompson J.Cole-Dai M.e.Davis p.-n.Lin Hyrd polar Research Center Ohio State University OH 45701 USAHyrd Polar Research Center Ohio State University OH 45701 USAHyrd Polar Research Center Ohio State University OH 45701 USAHyrd Polar Research Center Ohio State University OH 45701 USAHyrd Polar Research Center Ohio State University OH 45701 USA

A 36CI peak was found in the predicted section of Guliya ice core, from the Qinghai-Tibetan plateau, at about 37 kaBp. This cannot be interpreted by means of changes in the accumulation rate, but by the enhanced cosmogenic isotope production rate in the atmosphere. Compared with the records of 10Be and 36CI in the other regions, the peaks of the cosmogenic isotopes are global and can be considered as time marks. An intriguing fact is that the peaks coincided with cold periods.

关键词： Guliya ice core cosmogenic isotope 36Cl global event climatic change.

A HYBRID AppROACH FOR MInIMIZInG MAKeSpAn In peRMUTATIOn FLOWSHOp SCHeDULInG

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science and Systems engineering 2017年第1期26卷 50-76页

作者： Kannan Govindan R'Balasundaram n.Baskar e.Asokan Center for Sustainable engineering Operations Management Department of Technology and Innovation University of Southern Denmark Odense M Denmark-5230 Department of Mechanical engineering K.Ramakrishnan College of Engineering Tiruchirappalli Tamilnadu India Pin-621112 Department of Mechanical engineering Saranathan College of Engineering Tiruchirappalli Tamilnadu India Pin 620012 Department of production engineering National Institute of Technology Tiruchirappalli Tamilnadu India Pin-620015

This work proposes a hybrid approach for solving traditional flowshop scheduling problems to reduce the makespan （total completion time）. To solve scheduling problems, a combination of Decision Tree （DT） and Scatter Search （SS） algorithms are used. Initially, the DT is used to generate a seed solution which is then given input to the SS to obtain optimal / near optimal solutions of makespan. The DT used the entropy function to convert the given problem into a tree structured format / set of rules. The SS provides an extensive investigation of the search space through diversification. The advantages of both DT and SS are used to form a hybrid approach. The proposed algorithm is tested with various benchmark datasets available for flowshop scheduling. The statistical results prove that the proposed method is competent and efficient for solving flowshop problems.

关键词： Flowshop scheduling makespan decision tree algorithm scatter search algorithm hybrid algorithm

Intensification of power Quality Using pMSG and Cascaded Multi Cell Trans-Z-Source Inverter

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Circuits and Systems 2016年第11期7卷 3778-3793页

作者： e. Rajendran dr. C. Kumar dr. p. Suresh Anna University Chennai India Department of eee SKP Engineering College Tiruvannamalai India Sri Ranga poopathi College of engineering Alampoondi India national College of engineering Tirunelveli India

This script depicts the power quality intensification of Wind energy Transfer System (WeTS) using permanent Magnet Synchronous Generator (pMSG) and Cascaded Multi Cell Trans-Z-Source Inverter (CMCTZSI). The pMSG knocks the induction generator and earlier generators, because of their stimulating performances without taking the frame power. The Trans-Z-Source Inverter with one transformer and one capacitor is connected newly. To increase the boosting ratio gratuity a cascaded impression is proposed with adopting multi-winding transformer which provides an option for this manuscript to use coupled inductor as an alternative of multi-winding transformer and remains the matching voltage gain as cascaded multi cell trans-Z- source inverter. Accordingly the parallel capacitances are also balancing the voltage gain. The parallel correlation of the method is essentially to trim down the voltage stresses and to improve the input current gain of the inverter. By using MALAB Simulation, harmonics can be reduced up to 1.32% and also DC side can be boosted up our required level 200 - 1000 V achievable. The new hardware setup results demonstrate to facilitate the multi cell Trans Z-source inverter. This can be generated high-voltage gain [50 V - 1000 V] and also be credible. Moreover, the level of currents, voltages and Harmonics on the machinery is low.

关键词： neuro Fuzzy System (nFS) permanent Magnet Synchronous Generator (pMSG) Cascaded Multi Cell Trans-Z-Source Inverter (CMCTZSI) Wind energy Transfer System (WeTS)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

言语链

言语链

effect of weak measurement on quantum correlations

作者： p.B.·邓斯(p.B. Denes) e.n.·平森(e.n. pinson)

来源：南通市图书馆图书评论

学校读者我要写书评

暂无评论

Chinese physics B 2020年第11期29卷 174-181页

作者： L Jebli M Amzioug S e ennadifi n Habiballah M nassik epTHe Department of PhysicsFaculty of SciencesIbn Zohr UniversityAgadirMorocco Faculty of Applied Sciences Ibn Zohr UniversityAit-MelloulMorocco Abdus Salam International Center for Theoretical physics Strada Costiera11 I-34151TriesteItaly LHep-MS Department of PhysicsFaculty of Science Mohammed V UniversityRabatMorocco Department of physics Ecole Normale Sup´eieure(ENS)Mohammed V UniversityRabatMorocco

We investigate the local quantum uncertainty(LQU)in weak *** expression of weak LQU is explicitly ***,we consider some cases of three special X states,Werner state,circulant two-qubit states,and Heisenberg model via L... 详细信息

关键词： local quantum uncertainty weak measurement weak local quantum uncertainty

Direct Measurements of the electron energy Flux versus electron Temperature Gradient in Tokamak Discharges

在线全文

学校读者我要写书评

暂无评论

plasma Science and Technology 2004年第1期6卷 2130-2134页

作者： K.W.Gentle M.e.Austin p.e.phillips Fusion Research Center University of Texas USAFusion Research Center University of Texas USAFusion Research Center University of Texas USA

electron thermal transport is one of the most complex processes in fusionplasmas. It is generally described by a simple thermal diffusivity in transport analyses ofdischarges, but there is evidence of critical gradient effects with moderate stiffness. By analyzingperiodic perturbations to an equilibrium, one canmeasure the variations in electron energy flux andelectron temperature gradient over the perturbation cycle, obtaining the flux as a function ofgradient over the range of parameters generated by the perturbation. Although time-dependenttransport analysis is very sensitive to noise in the input data, averaging over many cycles of aperiodic perturbation can provide data of sufficient quality. The analyses presented here are basedon the eCe temperature data with high spatial and temporal resolution and full profile coverage onDIII-D for sawteeth and modulated eCH heating.

关键词： tokamak discharges electron energy flux electron temperature gradient direct measurements

Manipulation of space charge in silicon by intentional thermal donor activation

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2006年第A2期16卷 236-239页

作者： e. TUOVInen J. HARKOnen p. LUUKKA e. TUOMInen Helsinki Institute of physics University of Helsinki Finland 00014

A quantitative study about the thermal activation of thermal donors (TD) in high resistivity magnetic Czochralski (MCz) silicon was carried out. The samples are p+/p/n+ diodes (active area 0.25 cmp>2p>, thickness 300 μm) made of MCz p-type Si wafers with the resistivity of about 2 kΩ·cm. The concentration of interstitial oxygen (Oi) in this material was measured by the Fourier transformation infrared (FTIR) spectroscopy method and it is 4.9 × 10p>17p> cmp>-3p>. The TD activation was performed through an isochronal thermal treatment at 430°C up to a total time of 120 min. The space charge density after each annealing step was extracted from capacitance-voltage (CV) measurements. The TD generation can be utilized in processing of silicon detectors (pixel, strip and drift detectors) that are used e.g. in space applications, high-energy physics experiments, and several visual imaging applications. If the starting material is boron-doped p-type high-resistivity Cz-Si, the TD generation process can be utilized in order to produce p+/n-/n+ detectors. The last thermal process step, i.e. the sintering of aluminum, is intentionally carried out at the temperature where TD's are created. Due to the generated donors, the p-type bulk will eventually be compensated to n-type bulk. Moreover, the full depletion voltage of detectors (Vfd) could be tailored between a wide range from 30 V up to almost 1000 V by changing heat treatment duration at 400-450°C from 20 to 120 min.

关键词：热供体硅半导体粒子探测器电子活性缺陷空间电荷

Leishmaniasis in the Argentine Republic: Temporal and geographical distribution from 2013 to 2017

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian pacific Journal of Tropical Medicine 2019年第7期12卷 300-305页

作者： GermanóMaría J Salomón María C neira Gisela Lozano esteban Mackern-Oberti Juan p Cargnelutti Diego e Consejo nacional de Investigaciones Científicas y Técnicas Centro Científico y Tecnológico de MendozaInstituto de Medicina y Biología Experimental de CuyoMendozaArgentina Universidad nacional de Cuyo Facultad de Ciencias Médicasárea de ParasitologíaMendozaArgentina Universidad Juan Agustín Maza Facultad de Ciencias Veterinarias y AmbientalesCentro de Investigación en Parasitología RegionalMendozaArgentina Universidad nacional de Cuyo Facultad de Ciencias MédicasInstituto de FisiologíaMendozaArgentina

Objective: To assess the temporal and geographical distribution of confirmed cases of cutaneous, mucocutaneous and visceral leishmaniasis in the Argentine Republic from 2013 to 2017. Methods: A retrospective study was carried out using data collected from the Integrated Surveillance Bulletin database of the national System of Health Surveillance. Confirmed cases of cutaneous, mucocutaneous and visceral leishmaniasis up to the 52 nd epidemiological week of each year was included. Results: In the 5 years period, 1 295 confirmed leishmaniasis cases were reported in the Argentine Republic. One thousand twenty-eight(1 028) cases corresponded to cutaneous leishmaniasis(87.10%), being the most common type of leishmaniasis. Mucocutaneous leishmaniasis was in the second place in the country with 115 cases reported, mostly in the northwest and northeast regions. A total of 52 individuals with visceral leishmaniasis were identified and Misiones province was the most affected. Conclusions: It is important to analyze the temporal and geographical distribution of leishmaniasis in order to provide an adequate management and surveillance.

关键词： Leishmaniasis epidemiology Argentine Republic Temporal distribution Geographical distribution