Central European Journal of Engineering最新文献_第6页

Investigation of heat transfer in a triple-glazing type window at greek climate conditions 希腊气候条件下三层玻璃窗传热研究

Central European Journal of Engineering Pub Date : 2013-12-11 DOI: 10.2478/s13531-013-0130-9

M. G. Vrachopoulos, M. Koukou, George Filos, C. Moraitis

引用次数: 2

Soret and dufour effects on MHD mixed convection heat and mass transfer in a micropolar fluid Soret和dufour效应对微极流体中MHD混合对流传热传质的影响

Central European Journal of Engineering Pub Date : 2013-12-01 DOI: 10.2478/s13531-013-0131-8

D. Srinivasacharya, M. Upendar

引用次数: 12

Chemical engineering with focus on environmental impact and energy resources 化学工程，关注环境影响和能源资源

Central European Journal of Engineering Pub Date : 2013-12-01 DOI: 10.2478/S13531-013-0134-5

A. Bahadori

{"title":"Chemical engineering with focus on environmental impact and energy resources","authors":"A. Bahadori","doi":"10.2478/S13531-013-0134-5","DOIUrl":"https://doi.org/10.2478/S13531-013-0134-5","url":null,"abstract":"This topical issue devoted to Chemical engineering with focus on environmental impact and energy resources. There is no non-renewable energy source, which would be a completely \"clean and green\" energy source. Unfortunately, while getting the energy, we usually impact our environment in some negative way. All energy sources affect the environment in different levels. Some nonrenewable energy sources, such as coal, have a greater impact than others. Fortunately, the energy industries have become gradually aware of the importance of environmental protection and are working to reduce its longterm negative effects. This special issue tends to report on critical issues of the environment, including remediation and treatment of solid or aqueous wastes, air pollution, sustainable energy, the investigation of trends in and solutions to resolving the issues of continuing increase in worldwide demand for energy, the diminishing accessibility of natural energy resources, and the growing impact of energy use on the environment. Several papers were received for this special issue and after rigorous peerreview process, three top papers were accepted for this issue. We believe that this collection of papers is a very good reflection of the standard and the variety of the research that is going on in the chemical engineering with focus on environmental impact and energy resources. We would like to thank all the authors for submitting their papers, and all the referees for their important contributions. We are grateful to Dr Anna Kowalska, the managing editor of CEJE, for her support in publishing this special issue.","PeriodicalId":407983,"journal":{"name":"Central European Journal of Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130695085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

ASIC and FPGA based DPWM architectures for single-phase and single-output DC-DC converter: a review 基于ASIC和FPGA的单相和单输出DC-DC转换器DPWM架构:综述

Central European Journal of Engineering Pub Date : 2013-09-11 DOI: 10.2478/s13531-013-0118-5

Subhash Chander, P. Agarwal, I. Gupta

引用次数: 13

Optimization of building blocks for multi-stage 17–44 dB 6.1–9.6 mW 90-nm K-band front-ends 多级17-44 dB 6.1-9.6 mW 90 nm k波段前端构建模块的优化

Central European Journal of Engineering Pub Date : 2013-09-04 DOI: 10.2478/s13531-013-0120-y

A. Roy, A. B. M. Harun Rashid

{"title":"Optimization of building blocks for multi-stage 17–44 dB 6.1–9.6 mW 90-nm K-band front-ends","authors":"A. Roy, A. B. M. Harun Rashid","doi":"10.2478/s13531-013-0120-y","DOIUrl":"https://doi.org/10.2478/s13531-013-0120-y","url":null,"abstract":"In this article, five two-stage ∼6-mW and four three-stage ∼9-mW matched amplifier architectures are proposed to establish optimization procedure and quantify relative merits of cascode (CC), common-gate (CG), and commonsource (CS) building blocks for low-voltage low-power multi-stage front-ends. The circuits are simulated with a 90-nm CMOS technology including modeling of layout parasites. Integrated bias trees and passive port matching networks are incorporated in the K-band designs. In the face of process mismatch, variability in noise and gain figures remains <0.39 dB and <7.1 dB from the design values. The five combinations of building blocks in twostage low-power (6.1–6.6 mW) amplifiers achieve linearity (IIP3) in the range of −5.2∼–13.5 dBm, good reverse isolation (better than −26 dB), 2.89–3.82 dB noise penalties, and 17.2–25.5 dB peak forward gain. In case of threestage front-ends built with CS, CC, and CG blocks (power rating 9.2–9.6 mW), forward gain and optimized noise figures are found as >33 dB and <3.26 dB, respectively. They achieve −2.5∼18.3 dBm IIP3, <−39 dB reverse isolation, and <−17 dB minimum IRL. The results are compared with reported simulated findings on CMOS multistage amplifiers to highlight their relative advantages in terms of power requirement and decibel(gain)-per-watt.","PeriodicalId":407983,"journal":{"name":"Central European Journal of Engineering","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129025278","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Integration of thermophysiological body model in CFD 热生理体模型在CFD中的集成

Central European Journal of Engineering Pub Date : 2013-09-01 DOI: 10.2478/s13531-012-0071-8

G. Pichurov, P. Stankov

引用次数: 5

Analytical engineering models of high speed normal impact by hard projectiles on metal shields 硬弹丸高速法向撞击金属护罩的分析工程模型

Central European Journal of Engineering Pub Date : 2013-09-01 DOI: 10.2478/s13531-013-0108-7

G. Ben-Dor, A. Dubinsky, T. Elperin

引用次数: 9

Flow structure and cooling behavior of air impingement on a target plate 空气撞击靶板的流动结构与冷却行为

Central European Journal of Engineering Pub Date : 2013-09-01 DOI: 10.2478/s13531-013-0103-z

Adnan A. Abdul Rasool, F. Hamad

{"title":"Flow structure and cooling behavior of air impingement on a target plate","authors":"Adnan A. Abdul Rasool, F. Hamad","doi":"10.2478/s13531-013-0103-z","DOIUrl":"https://doi.org/10.2478/s13531-013-0103-z","url":null,"abstract":"An experimental data of flow field, pressure coefficient and heat transfer of a jet impinging normally on a flat target plate are presented. The measurements of temperatures and static pressures were carried out for flow from three orifices of 5, 10 and 20 mm diameter for orifice-to-target plate distances of 5, 10, 25, 50, 70, 100 and 120 mm from the orifice exit. The axial development of flow structure of the jet from the orifice was investigated by measuring the radial jet velocity distributions at the same axial distances used to measure heat transfer and static pressure. The results show that pressure coefficients distributions on the target plate are similar to the velocity distributions in the impinging jet which indicates the strong relationship between the two parameters. The pressure coefficients from large orifice diameter are higher than the values from the small orifice diameter for same orifice-to-target plate distance. The results also show a nonlinear increase of heat transfer rate with orifice size and the ratio of axial distance to orifice diameter (X/d). The nonlinear behaviour may be attributed to the complex nature of flow structure at the stagnation region. The high velocity gradients at the stagnation zone leads to higher turbulence and comparatively higher values of heat transfer rates for large orifice diameter.","PeriodicalId":407983,"journal":{"name":"Central European Journal of Engineering","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130233486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Correlation between permanent deformation-related performance parameters of asphalt concrete mixes and binders 沥青混凝土混合料与粘结剂永久变形相关性能参数的相关性研究

Central European Journal of Engineering Pub Date : 2013-09-01 DOI: 10.2478/s13531-012-0073-6

K. Adorjányi, P. Füleki

引用次数: 8

Functional variable method to study nonlinear evolution equations 用泛函变量法研究非线性演化方程

Central European Journal of Engineering Pub Date : 2013-09-01 DOI: 10.2478/s13531-013-0104-y

M. Eslami, M. Mirzazadeh

引用次数: 20