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Central European Journal of Engineering最新文献

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Comparing between G′/G expansion method and tanh-method G′/G展开法与tanh法的比较
Central European Journal of Engineering Pub Date : 2014-07-02 DOI: 10.2478/s13531-013-0171-0
Z. Ayati
{"title":"Comparing between G′/G expansion method and tanh-method","authors":"Z. Ayati","doi":"10.2478/s13531-013-0171-0","DOIUrl":"https://doi.org/10.2478/s13531-013-0171-0","url":null,"abstract":"In this paper, G′/G-expansion and tanh-methods, as two well known methods, for solving partial differential equations are compared. It has been shown that these two methods are the same, for solving partial Differential equation in special conditions. For illustration and more explanation of the idea, two examples are provided.","PeriodicalId":407983,"journal":{"name":"Central European Journal of Engineering","volume":"71 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120982428","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: 3
Research of some operating parameters and the emissions level variation in a spark ignited engine through on-board investigation methods in different loading conditions 采用车载调查方法，研究了火花点火发动机在不同载荷条件下的一些工作参数和排放水平变化
Central European Journal of Engineering Pub Date : 2014-06-27 DOI: 10.2478/s13531-013-0167-9
F. Iosif, D. Băldean
{"title":"Research of some operating parameters and the emissions level variation in a spark ignited engine through on-board investigation methods in different loading conditions","authors":"F. Iosif, D. Băldean","doi":"10.2478/s13531-013-0167-9","DOIUrl":"https://doi.org/10.2478/s13531-013-0167-9","url":null,"abstract":"The present paper shows research made on a spark ignited engine with port fuel injection in different operation conditions in order to improve the comprehension about the cold start sequence, acceleration when changing the gear ratios, quality of combustion process and also any measures to be taken for pollutant reduction in such cases. The engineering endeavor encompasses the pollutants investigation during the operation time of gasoline supplied engine with four inline cylinders in different conditions. The temperature and any other parameters were measured with specific sensors installed on the engine or in the exhaust pipes. All the data collected has been evaluated using electronic investigation systems and highly developed equipment. In this manner it has enabled the outline of the idea of how pollutants of engine vary in different operating conditions. Air quality in the everyday environment is very important for the human health, and thus the ambient air quality has a well-known importance in the European pollution standards and legislation. The high level of attention directed to the pollution problem in the European lifestyle is a driving force for all kinds of studies in the field of the reduction of engine emission.","PeriodicalId":407983,"journal":{"name":"Central European Journal of Engineering","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126102427","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: 7
Biodiesel production and Environmental CO2 cleanup using Oleaginous Microorganisms from Al-Hassa area in Saudi Arabia 利用沙特阿拉伯Al-Hassa地区产油微生物生产生物柴油和环境二氧化碳净化
Central European Journal of Engineering Pub Date : 2014-06-14 DOI: 10.2478/s13531-013-0169-7
A. El-Sinawi, M. Shathele
{"title":"Biodiesel production and Environmental CO2 cleanup using Oleaginous Microorganisms from Al-Hassa area in Saudi Arabia","authors":"A. El-Sinawi, M. Shathele","doi":"10.2478/s13531-013-0169-7","DOIUrl":"https://doi.org/10.2478/s13531-013-0169-7","url":null,"abstract":"Biodiesel production is rapidly moving towards the mainstream as an alternative source of energy. Algae oil is one of the viable feed stocks among others to produce Biodiesel. However the difficulties in efficient biodiesel production from algae lie not in the extraction of the oil, but in finding an algal strain with a high lipid content and fast growth rate. This paper presents an experimental work performed to study the production of biodiesel from local algae strains in Al-Hassa territory of the eastern province in Saudi Arabia which was found to contain high lipid contents and show rapid growth. The collected results predict that those types of desert algae are promising and are considered to be a potential feedstock for biofuels.","PeriodicalId":407983,"journal":{"name":"Central European Journal of Engineering","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130874581","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
Stability of the equilibrium positions of an engine with nonlinear quadratic springs 非线性二次弹簧发动机平衡位置的稳定性
Central European Journal of Engineering Pub Date : 2014-06-01 DOI: 10.2478/s13531-013-0138-1
N. Stanescu, D. Popa
{"title":"Stability of the equilibrium positions of an engine with nonlinear quadratic springs","authors":"N. Stanescu, D. Popa","doi":"10.2478/s13531-013-0138-1","DOIUrl":"https://doi.org/10.2478/s13531-013-0138-1","url":null,"abstract":"Our paper realizes a study of the equilibrium positions for an engine supported by four identical nonlinear springs of quadratic characteristic. The systems with quadratic characteristic are generally avoided because they lead to mathematical complications. Our goal is to realize such a study for an engine supported on quadratic springs. For the model purposed, we established the equations of motion and we discussed the possibilities for the equilibrium positions. Because of the quadratic characteristic of the springs and of the approximations made for the small rotations, the equations obtained for the equilibrium lead us to a paradox, which consists in the existence of an open neighborhood in which there exists an infinity of positions of indifferent equilibrium, or a curve where the equilibrium positions are situated. Moreover, the study of the stability shows that the stability is assured for the position at which the springs are not compressed. Finally, a numerical example is presented and completely solved.","PeriodicalId":407983,"journal":{"name":"Central European Journal of Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128601796","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: 3
Internal combustion engine supercharging: turbocharger vs. pressure wave compressor. Performance comparison 内燃机增压:涡轮增压器与压力波压气机。性能比较
Central European Journal of Engineering Pub Date : 2014-06-01 DOI: 10.2478/s13531-013-0133-6
Atanasiu Catalin George, A. Chiru
{"title":"Internal combustion engine supercharging: turbocharger vs. pressure wave compressor. Performance comparison","authors":"Atanasiu Catalin George, A. Chiru","doi":"10.2478/s13531-013-0133-6","DOIUrl":"https://doi.org/10.2478/s13531-013-0133-6","url":null,"abstract":"This paper aims on comparison between a turbocharged engine and a pressure wave charged engine. The comparison was accomplished using the engine simulation software AVL Boost, version 2010. The grahps were extracted using AVL Impress, version 2010. The performance increase is limited by the mechanical side of the simulated engine.","PeriodicalId":407983,"journal":{"name":"Central European Journal of Engineering","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125332081","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: 6
AMMA 2013 — 3rd International congress automotive, motor, mobility, ambient AMMA 2013 -第三届国际会议汽车，电机，移动，环境
Central European Journal of Engineering Pub Date : 2014-06-01 DOI: 10.2478/S13531-013-0166-X
B. Varga
{"title":"AMMA 2013 — 3rd International congress automotive, motor, mobility, ambient","authors":"B. Varga","doi":"10.2478/S13531-013-0166-X","DOIUrl":"https://doi.org/10.2478/S13531-013-0166-X","url":null,"abstract":"","PeriodicalId":407983,"journal":{"name":"Central European Journal of Engineering","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116953059","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
Corrosion and wear study of Ni-P-PTFE-Al2O3 coating: the effect of heat treatment Ni-P-PTFE-Al2O3涂层的腐蚀磨损研究:热处理的影响
Central European Journal of Engineering Pub Date : 2014-05-29 DOI: 10.2478/s13531-013-0137-2
Ankita Sharma, A. Singh
{"title":"Corrosion and wear study of Ni-P-PTFE-Al2O3 coating: the effect of heat treatment","authors":"Ankita Sharma, A. Singh","doi":"10.2478/s13531-013-0137-2","DOIUrl":"https://doi.org/10.2478/s13531-013-0137-2","url":null,"abstract":"In the present work, Ni-P-PTFE-Al2O3 nanodispersion coatings were developed on mild steel. These coatings were heat treated and were exposed to 3.5% NaCl solution. Thus obtained as plated, heat treated and exposed coatings were investigated for their corrosion and wear behavior together with other tribological properties. SEM/EDAX and X-ray diffractometry were used to analyze composition and structural changes of the coatings. Corrosion parameters of the coated samples were obtained from electrochemical polarization and immersion tests. Microhardness, wear resistance and friction coefficient of the coatings were also measured. The results showed that heat treatment at 200°C has little effect on the coating whereas treatment at 400°C results in enhanced crystallinity due to formation of intermetallics phases and possibly aluminum phosphide. Beyond this temperature at 600°C coarsening of the grains occurs which reduces the number of hardening sites. These structural changes result in the observance of highest hardness and lowest wear rate in case of coatings treated at 400°C. Corrosion resistance of the coated samples was observed to decrease with the heat treatment presumably due to the various physical and structural changes of the coating components. Similar changes were observed on their exposure to the corrosive media.","PeriodicalId":407983,"journal":{"name":"Central European Journal of Engineering","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129365883","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: 6
Decentralized control synthesis for bilinear systems using orthogonal functions 利用正交函数的双线性系统分散控制综合
Central European Journal of Engineering Pub Date : 2014-05-29 DOI: 10.2478/s13531-013-0146-1
M. S. Attia, Badii Ayadi, N. Braiek
{"title":"Decentralized control synthesis for bilinear systems using orthogonal functions","authors":"M. S. Attia, Badii Ayadi, N. Braiek","doi":"10.2478/s13531-013-0146-1","DOIUrl":"https://doi.org/10.2478/s13531-013-0146-1","url":null,"abstract":"In this paper, we propose the development of a new technique of decentralized control for bilinear systems, through using orthogonal functions. The use of this tool allows the conversion of differential state equations to a set of algebraic ones by projecting the system input and output variables into orthogonal functions basis and then using the operational properties of these orthogonal functions. The optimum decentralized control parameters for the interconnected bilinear system can then be determined through comparison of the response behaviour with the chosen reference model.","PeriodicalId":407983,"journal":{"name":"Central European Journal of Engineering","volume":"11 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120899052","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: 6
Dosimetry in the human head for two types of mobile phone antennas at GSM frequencies GSM频率下两种移动电话天线的人体头部剂量测定
Central European Journal of Engineering Pub Date : 2014-05-29 DOI: 10.2478/s13531-013-0140-7
R. Karli, H. Ammor, J. Terhzaz
{"title":"Dosimetry in the human head for two types of mobile phone antennas at GSM frequencies","authors":"R. Karli, H. Ammor, J. Terhzaz","doi":"10.2478/s13531-013-0140-7","DOIUrl":"https://doi.org/10.2478/s13531-013-0140-7","url":null,"abstract":"In this paper, a comparative study of dipole and patch antennas commonly used in portable telephones is investigated. The two models antennas are considered working at 900, 1800 and 2450 MHz bands. Thus, we have included different distances between the mobile phone and the human head model. This study shows the effects of electromagnetic waves on the human head model. The objective is to evaluate the SAR in simulation anatomic based model of the human head for different antenna-head distances and in many frequencies. All numerical simulations results are performed using Ansoft HFSS software.","PeriodicalId":407983,"journal":{"name":"Central European Journal of Engineering","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125957839","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: 4
Engineering models of high speed penetration into geological shields 高速侵彻地质盾构的工程模型
Central European Journal of Engineering Pub Date : 2014-05-29 DOI: 10.2478/s13531-013-0135-4
G. Ben-Dor, A. Dubinsky, T. Elperin
{"title":"Engineering models of high speed penetration into geological shields","authors":"G. Ben-Dor, A. Dubinsky, T. Elperin","doi":"10.2478/s13531-013-0135-4","DOIUrl":"https://doi.org/10.2478/s13531-013-0135-4","url":null,"abstract":"The survey is dedicated to approximate empirical and analytical models which were suggested for describing high-speed penetration into geological shields. This review differs from the previously published reviews on this topic in the following respects: (i) includes a large number of models; (ii) describes models suggested during recent years; (iii) much attention is given to models which have been originally published in Russian and are not well known in the West. References list includes 81 items.","PeriodicalId":407983,"journal":{"name":"Central European Journal of Engineering","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115091231","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: 23
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