全文获取类型
收费全文 | 1430篇 |
免费 | 145篇 |
国内免费 | 47篇 |
专业分类
电工技术 | 65篇 |
综合类 | 74篇 |
化学工业 | 265篇 |
金属工艺 | 48篇 |
机械仪表 | 86篇 |
建筑科学 | 57篇 |
矿业工程 | 35篇 |
能源动力 | 33篇 |
轻工业 | 142篇 |
水利工程 | 23篇 |
石油天然气 | 62篇 |
武器工业 | 4篇 |
无线电 | 204篇 |
一般工业技术 | 181篇 |
冶金工业 | 175篇 |
自动化技术 | 168篇 |
出版年
2024年 | 11篇 |
2023年 | 26篇 |
2022年 | 37篇 |
2021年 | 51篇 |
2020年 | 34篇 |
2019年 | 38篇 |
2018年 | 51篇 |
2017年 | 52篇 |
2016年 | 51篇 |
2015年 | 43篇 |
2014年 | 62篇 |
2013年 | 88篇 |
2012年 | 72篇 |
2011年 | 104篇 |
2010年 | 70篇 |
2009年 | 67篇 |
2008年 | 85篇 |
2007年 | 70篇 |
2006年 | 58篇 |
2005年 | 66篇 |
2004年 | 28篇 |
2003年 | 44篇 |
2002年 | 47篇 |
2001年 | 32篇 |
2000年 | 28篇 |
1999年 | 35篇 |
1998年 | 75篇 |
1997年 | 47篇 |
1996年 | 31篇 |
1995年 | 18篇 |
1994年 | 24篇 |
1993年 | 16篇 |
1992年 | 11篇 |
1991年 | 1篇 |
1990年 | 11篇 |
1989年 | 6篇 |
1988年 | 3篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1985年 | 4篇 |
1984年 | 2篇 |
1982年 | 2篇 |
1981年 | 3篇 |
1980年 | 2篇 |
1979年 | 1篇 |
1978年 | 2篇 |
1977年 | 4篇 |
1976年 | 3篇 |
1975年 | 2篇 |
1970年 | 1篇 |
排序方式: 共有1622条查询结果,搜索用时 15 毫秒
11.
S Lehéricy M Vidailhet D Dormont L Piérot J Chiras P Mazetti C Marsault Y Agid 《Canadian Metallurgical Quarterly》1996,53(3):241-250
The effects of manual and a new mechanical chest compression device (Heartsaver 2000) during prolonged CPR with respect to haemodynamics and outcome were tested in a prospective, randomized, controlled experimental trial during ventricular fibrillation in 12 dogs of 9-13 kg body weight after 1 min of cardiac arrest. During the first 10 min of CPR the dogs were resuscitated according to the Basic Life Support (BLS) algorithm, followed by 20 min of Advanced Life Support (ALS) algorithm. After 30 min of CPR both manual and mechanical CPR groups were resuscitated following a standardized ALS protocol. During CPR, coronary perfusion pressure and end tidal CO2 were greater with mechanical CPR. All animals were successfully resuscitated and neurological deficit scores were not different. The CPR trauma score was less in the mechanical group. Mechanical external chest compression provided better haemodynamics than the manual technique, though outcome did not differ. Both optimally performed manual and mechanical techniques produce flow sufficient to maintain organ viability for 30 min of CPR after a 1 min arrest interval. 相似文献
12.
AF Nikkels S Debrus C Sadzot-Delvaux J Piette B Rentier GE Piérard 《Canadian Metallurgical Quarterly》1995,47(4):342-347
Early and specific recognition of varicella zoster virus (VZV) infection is of vital concern in immunocompromised patients. The aim of this study was to compare the diagnostic accuracy of histochemical and immunohistochemical identification of the VZV ORF63 encoded protein (IE63) and of the VZV late protein gE on smears and formalin-fixed paraffin-embedded skin sections taken from lesions clinically diagnosed as varicella (n = 15) and herpes zoster (n = 51). Microscopic examinations of Tzanck smears and skin sections yielded a diagnostic accuracy of Herpesviridae infections in 66.7% (10/15) and 92.3% (12/13) of varicella, and 74.4% (29/39) and 87.8% (43/49) of herpes zoster, respectively. Immunohistochemistry applied to varicella provided a type-specific virus diagnostic accuracy of 86.7% (13/15; IE63) and 100% (15/15; gE) on smears, and of 92.3% for both VZV proteins on skin sections. In herpes zoster, the diagnostic accuracy of immunohistochemistry reached 92.3% (36/39; IE63) and 94.9% (37/39; gE) on smears, and 91.7% (44/48; IE63) and 91.8% (45/49; gE) on skin sections. These findings indicate that the immunohistochemical detection of IE63 and gE on both smears and skin sections yields a higher specificity and sensitivity than standard microscopic assessments. 相似文献
13.
本文对Lurgi低压法甲醇工艺中压力的参变效应进行了探讨.通过计算机模拟,给出了合成压力变化的效应情况.计算结果表明煤头小型低压法甲醇装置的合成压力应高于大型装置的合成压力,其值在7.3~8.0MPa之间可取得最佳的节能降耗效果. 相似文献
14.
J Caballero Güeto R Arana G Calle FJ Caballero Güeto E García del Río M Sancho C Pi?ero 《Canadian Metallurgical Quarterly》1997,50(12):906-908
Propionibacterium acnes is often considered to be a contaminant but it has also been found to be the principal pathogen in serious infections. P. acnes is a rare cause of infective endocarditis. It has been suggested that aortic root abscesses are caused by bacteria that are particularly virulent. The strongest risk factor for serious infections by this bacteria is the presence of foreign bodies. A case is presented in which endocarditis of a native aortic valve caused by P. acnes was associated with an aortic root abscess. Transesophageal echocardiography is particularly helpful in the diagnosis of this severe complication of infective endocarditis. The literature for P. acnes endocarditis is reviewed. 相似文献
15.
Wei Fen Zhang Xi Guang Chen Pi Wu Li Cheng Sheng Liu Qiang Zhi He 《Drying Technology》2008,26(1):108-115
Three kinds of carboxymethyl chitosan/β-cyclodextrin microspheres loaded with theophylline were prepared by spray drying intended for pulmonary delivery. Mucociliotoxicity, permeation rate, and drug release characteristics of the product were investigated. The microspheres obtained by spray drying were found to be spherical with smooth or wrinkled surfaces. The mean particle size was between 3.39 and 6.06 µm. The microspheres demonstrated high product yield (43.7-50.2%), high drug loading (13.7-38.1%), and high encapsulation efficiency (86.9-92.8%). FT-IR indicated that there were interactions of theophylline with carboxymethyl chitosan matrix. Further studies on mucociliotoxicity and permeation confirmed that microspheres had better adaptability and high permeation rate. In vitro drug release from the microspheres was not related to the drug/polymer ratios. 相似文献
16.
BACKGROUND: The matrix metalloproteinases (MMPs) MMP2 and MMP9 play a significant role in epidermal detachment, inflammation and re-epithelialization. We have evaluated their activity in toxic epidermal necrolysis (TEN). DESIGN: The level and pattern of activity of MMP2 and MMP9 were investigated by measuring the degradation of 3H-labelled gelatin and by zymography in blister fluid from six TEN patients and compared the results with three other blistering conditions: bullous pemphigoid (n = 6), second-degree burn (n = 13) or suction blister (n = 3). RESULTS: A higher amount of MMP2 was found in TEN blister fluid with the constant presence of a significantly larger proportion of the activated forms of MMP2, a particular feature of TEN, than the other blistering diseases studied. CONCLUSION: This study emphasizes the potential role of MMP2 in the specific inflammatory reaction and reparation process in TEN skin. 相似文献
17.
M Guilleumas M Barranco DM Jezek RJ Lombard M Pi 《Canadian Metallurgical Quarterly》1996,54(22):16135-16138
18.
JC López Pacios L Parra Muntaner MC Pi?eiro Fernández SC Gómez Cisneros E Sánchez Sánchez JA Rivas Escudero FJ Madrid García J García Alonso 《Canadian Metallurgical Quarterly》1998,51(4):331-333
The occurrence of secondary hypogonadism is a common finding in males who seek help with erectile dysfunction, although the relationship to diminished testosterone is unclear. Two possibilities exist regarding both the genesis and maintenance of the hypogonadotropic hypogonadal state. First, a defect in hypothalamic function, resulting in downregulation as well as in alterations of anterior pituitary function; second, estradiol inhibition of gonadotropin release, both of which result in decreased testosterone production. As testosterone levels decrease and estradiol levels increase, the ratio of free testosterone to estradiol reaches a critical point and the estrogenic gonadotropin suppressive effects predominate. This ratio may signal the biological point of no return and could become one of the criteria for defining the separation of the transitional hypogonadal state from the final 'end stage' hypogonadotropic hypogonadal state. As the aging process continues, there is a relative accumulation of fatty tissue, and aromatization accelerates the conversion of testosterone to estradiol. This additional secondary estradiol inhibition results in the maintenance of the testosterone deficient state, and the aging process continues uncontested. 相似文献
19.
针对基于PC机和专用运动控制卡的传统数控系统的不足,提出了ARM微处理器(S3C2440)和数字信号处理芯片DSP(TMSC6713)双CPU主从式结构硬件平台,嵌入式Linux操作系统软件平台构建嵌入式运动控制器的方法;分别介绍了此嵌入式运动控制器主从控制板的硬件结构设计;软件方面,在Linux2.6内核环境下设计了FPGA的驱动程序,并给出了基于MiniGUI的人机界面设计以及DSP软件实现的程序结构框架;测试结果表明,该运动控制器工作可靠、运算能力强、结构灵活,精度达到1μm,在实践中有一定的借鉴意义。 相似文献
20.
通过对Goertzel算法的优化和运用查表法处理来加快其运算速度。在硬件电路的基础上,用C语言完成了实际应用的算法程序。采用Atmel公司51系列外接晶振时钟频率可高达24MHz的单片机AT89C2051-24SU,运算后输出了一定频率的正弦基波及其多次谐波组成的波形。 相似文献