全文获取类型
收费全文 | 318篇 |
免费 | 27篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 6篇 |
综合类 | 3篇 |
化学工业 | 84篇 |
金属工艺 | 3篇 |
机械仪表 | 20篇 |
建筑科学 | 7篇 |
能源动力 | 12篇 |
轻工业 | 61篇 |
水利工程 | 2篇 |
石油天然气 | 3篇 |
无线电 | 43篇 |
一般工业技术 | 57篇 |
冶金工业 | 14篇 |
自动化技术 | 31篇 |
出版年
2024年 | 1篇 |
2023年 | 3篇 |
2022年 | 14篇 |
2021年 | 19篇 |
2020年 | 14篇 |
2019年 | 13篇 |
2018年 | 22篇 |
2017年 | 11篇 |
2016年 | 21篇 |
2015年 | 9篇 |
2014年 | 10篇 |
2013年 | 36篇 |
2012年 | 14篇 |
2011年 | 22篇 |
2010年 | 14篇 |
2009年 | 13篇 |
2008年 | 14篇 |
2007年 | 13篇 |
2006年 | 14篇 |
2005年 | 8篇 |
2004年 | 6篇 |
2003年 | 6篇 |
2002年 | 3篇 |
2001年 | 2篇 |
2000年 | 7篇 |
1999年 | 3篇 |
1998年 | 2篇 |
1997年 | 4篇 |
1996年 | 5篇 |
1995年 | 1篇 |
1994年 | 4篇 |
1993年 | 1篇 |
1992年 | 3篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 3篇 |
1978年 | 1篇 |
1975年 | 1篇 |
1971年 | 1篇 |
排序方式: 共有346条查询结果,搜索用时 0 毫秒
101.
Ahmed Mokhtar 《Canadian Metallurgical Quarterly》2006,12(2):100-105
Fundamental architectural decisions such as a building’s form and orientation greatly influence the energy performance of a building. As these decisions are taken very early in the design process, it is important for the designer to consider such performance when comparing design alternatives. Unfortunately, this is rarely done by architects. The reason can be easily tracked to the way most architects learn about energy. Simple charts and some rules of thumb are preferred over complex calculations used by engineers and energy specialists. This paper presents an experiment conducted by the writer to tackle this problem. The writer used a purpose-made software program that is developed to help architecture students learn the impact of the conceptual design decisions on the expected energy performance of a building represented in the solar intensity on the building surfaces. The paper describes the capabilities and the structure of the software program as well as the context and the results of the experiment. 相似文献
102.
Zhaowei Zhang Chun Tian M.R. Mokhtar P. Petropoulos D.J. Richardson M. Ibsen 《Photonics Technology Letters, IEEE》2006,18(11):1216-1218
We demonstrate the capacity for fast dynamic reconfiguration of optical code-division multiple access (OCDMA) phase en/decoders based on fiber Bragg gratings and a thermal phase-tuning technique. The tuning time between two different phase codes is measured to be less than 2 s. An OCDMA system using tunable-phase decoders is compared with a system using fixed-phase decoders and, although the system using fixed-phase decoders exhibits a shorter output autocorrelation pulsewidth and lower sidelobes, the system using tunable-phase decoders has advantages of flexibility and a more relaxed requirement on the input pulsewidth. 相似文献
103.
Retracted: Hydrogen production using catalytic and noncatalytic supercritical water gasification of bagasse
下载免费PDF全文
![点击此处可从《国际能源研究杂志》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Mohammad Barati Mokhtar Babatabar Ahmad Tavasoli Ajay K. Dalai Umashankar Das 《国际能源研究杂志》2014,38(10):1366-1366
The above article, published online on 10 May 2014 in Wiley Online Library ( wileyonlinelibrary.com ), has been retracted by agreement between the authors, the journal Editor in Chief, Ibrahim Dincer, and John Wiley & Sons, Ltd. The retraction has been agreed due to overlap between this article and the following article published in Fuel Processing Technology; ‘Hydrogen production via supercritical water gasification of bagasse using unpromoted and zinc promoted Ru/γ‐Al2O3 nanocatalysts’ by Mokhtar Babatabar, Ahmad Tavasoli, Ajay K. Dalai, Umashanker Das. Volume 123, 2014, pages 140–148. 相似文献
104.
105.
Graphene Aerogels: Joule Heating Characteristics of Emulsion‐Templated Graphene Aerogels (Adv. Funct. Mater. 1/2015)
下载免费PDF全文
![点击此处可从《Advanced functional materials》网站下载免费的PDF全文](/ch/ext_images/free.gif)
106.
Morteza Esmaeili Mokhtar Salahian Mohammad-Hesam Tadayon 《AEUE-International Journal of Electronics and Communications》2011,65(12):1069-1072
Construction of q-ary quasi-cyclic low-density parity-check (QC-LDPC) codes based on two-dimensional multiplicative arrays over Zq−1, q = 2m, is studied. In particular, two-dimensional arrays formed by the set of quadratic-residue numbers modulo prime numbers less than q are considered. 相似文献
107.
Belkadi Abdelmoumene Meliani Meriem Fethia Kebir-Medjhouda Zohra Aouali Mokhtar Adel Abdelkrim Soumia Djelad Amal Bengueddach Abdelkader Sassi Mohamed 《SILICON》2023,15(4):1793-1806
Silicon - Herein, a pure and well crystallized Na-magadiite was synthesized by hydrothermal method. It was then used as a host matrix to prepare hybrid materials by intercalation of zwitterionic... 相似文献
108.
Mahmoud Mokhtar Ibrahim Salma A. H. Tawfique Mahmoud M. Mahdy 《Drug development and industrial pharmacy》2014,40(6):765-773
In this study, unilamellar liposomal vesicles of diltiazem HCl (DH) were prepared using either reversed phase evaporation (REV) or proliposome methods. Soya phosphatidylcholine (SPC) was used for preparing the liposomes, and the vesicles were rigidified using cholesterol (Chol) or cetyl alcohol (CA) in different molarities. The major differences in both the entrapment efficiency percent (EE%) and drug release were evaluated as a function of the method of preparation, Chol or CA contents, and charging lipids. Moreover, the morphology of the vesicles was confirmed by transmission electron microscopy. The effects of Chol or CA incorporation into the liposomes were discussed based on thermal analysis. The in vivo evaluation of liposomal DH was assessed using intra-ocular pressure (IOP), reducing effects in rabbit eyes. Liposomes prepared via REV exhibited higher EE% and lower release rates when compared with those prepared from proliposomes. The incorporation of either Chol or CA in the liposomes enhanced the EE% and decreased the release rates; however, Chol yielded higher results than CA. In addition, both dicetyl phosphate (DCP; negative charge inducer) and stearyl amine (SA, positive charge inducer) decreased the EE% and increased the DH release rate. The in vivo antiglaucoma effects of the liposomes were calculated according to the area above the IOP/Time curve, the maximum response and the time for the maximum response and were compared with effects of the DH solution. The results were in the following order: DH solution?相似文献
109.
Thermodynamic Analysis and Comparison of Performances of Air Standard Atkinson,Otto, and Diesel Cycles with Heat Transfer Considerations
下载免费PDF全文
![点击此处可从《亚洲传热研究》网站下载免费的PDF全文](/ch/ext_images/free.gif)
This paper focuses on the overall performances of Otto, Atkinson, and Diesel air standard cycles. This study compares performance of these cycles with regard to parameters such as variable specific heat ratio, heat transfer loss, frictional loss, and internal irreversibility based on finite‐time thermodynamics. The relationship between thermal efficiency and compression ratio, and between power output and compression ratio of these cycles are obtained by numerical examples. In this study, it is assumed that during the combustion process, the heat transfer occurs only through the cylinder wall. The heat transfer is affected by the average temperature of both the cylinder wall and the working fluid. The results show that for each cycle, with the increase of the compression ratio in the specific mean piston speed, power output and thermal efficiency first increase and after reaching their maximum value, start to decrease. The results also indicate that maximum power output and maximum thermal efficiency of an Atkinson cycle could be higher than the values of these parameters in Diesel cycle and Otto cycle in the same operating conditions. The maximum power output and the maximum thermal efficiency of the Otto cycle have the lowest value among studied cycles. By increasing the mean piston speed, power output and thermal efficiency of Atkinson, Diesel, and Otto cycles start to decrease. The results of this study provide guidance for the performance analysis and show the improvement areas of practical Otto, Atkinson, and Diesel engines. 相似文献
110.
AN Malaviya R Marouf K Al-Jarallah A Al-Awadi K Al-Saied S Al-Gaurer A Khamis I Al-Salem R Raghupathy M Al-Mazidi F Serebour I Umamaheswaran M Mourou M Mokhtar M Qurtom A Raoof Al-Shayeb T Tarasevicius MA Hussain 《Canadian Metallurgical Quarterly》1996,35(11):1132-1136
The objective was to study antiphospholipid antibody syndrome (APS or Hughes syndrome) in two major teaching hospitals in Kuwait. patients with suspected Hughes syndrome were investigated with tests for anticardiolipin antibodies (aCL) and lupus anticoagulants (LAC) over 1 yr. Diagnosis was considered confirmed if significant levels of either or both antibodies with no obvious cause (primary), or with systemic lupus erythematosus (SLE) or SLE-like illness (including SLE serology) (secondary) were present. Twelve (37.5%; seven females, 58%) primary and 20 (62.5%; 18 females, 90%) secondary Hughes syndrome patients were seen during this period. patients were Kuwaiti, Middle-Eastern and North-African Arabs (29). Filipinos (2) and White (1). None were from the Indian subcontinent. The main presentation was thrombosis in 75% (arterial in 25% and venous in 50%), and recurrent abortions in 50% of married women. Haematological and dermatological manifestations were limited entirely to the secondary variety, seen in 25% and 19%, respectively. Clinical manifestations were severe, leading to death in one, intensive-care management in 31% and with partial or complete warfarin resistance or brittleness in 25%. Neurological/eye and cardiac manifestations were not seen, as these patients may be attending separate speciality hospitals for these diseases in Kuwait. The approximate prevalence of this syndrome was 2.66/1000 admissions in medical wards. Projected to the total referral areas of the two hospitals, an approximate figure of 52 patients/million population/year was obtained. Hughes syndrome was a common problem among Arabs, Filipinos and possibly Whites in Kuwait. Its manifestations were severe, often requiring intensive-care management, and in one case it was fatal. Patients from the Indian subcontinent were conspicuous by their absence, despite the fact that they were well represented in all other rheumatic disease groups. Ethnic and/or geographical factors could be important in this syndrome. To the best of our knowledge, this is the first report of Hughes syndrome from the Middle East. 相似文献