全文获取类型
收费全文 | 2822篇 |
免费 | 5篇 |
专业分类
化学工业 | 17篇 |
金属工艺 | 1篇 |
机械仪表 | 1篇 |
矿业工程 | 1篇 |
轻工业 | 5篇 |
无线电 | 7篇 |
一般工业技术 | 6篇 |
冶金工业 | 2787篇 |
原子能技术 | 2篇 |
出版年
2020年 | 4篇 |
2018年 | 1篇 |
2017年 | 2篇 |
2016年 | 1篇 |
2015年 | 1篇 |
2014年 | 1篇 |
2013年 | 6篇 |
2012年 | 1篇 |
2010年 | 2篇 |
2009年 | 3篇 |
2008年 | 2篇 |
2007年 | 1篇 |
2005年 | 1篇 |
2003年 | 3篇 |
2000年 | 3篇 |
1999年 | 84篇 |
1998年 | 913篇 |
1997年 | 489篇 |
1996年 | 333篇 |
1995年 | 183篇 |
1994年 | 139篇 |
1993年 | 148篇 |
1992年 | 17篇 |
1991年 | 43篇 |
1990年 | 32篇 |
1989年 | 33篇 |
1988年 | 33篇 |
1987年 | 44篇 |
1986年 | 36篇 |
1985年 | 20篇 |
1984年 | 1篇 |
1983年 | 3篇 |
1982年 | 10篇 |
1981年 | 16篇 |
1980年 | 20篇 |
1979年 | 1篇 |
1978年 | 2篇 |
1977年 | 56篇 |
1976年 | 133篇 |
1975年 | 5篇 |
1955年 | 1篇 |
排序方式: 共有2827条查询结果,搜索用时 15 毫秒
131.
Infants today lose maternal measles antibody sooner than in the past. This is related to demographic changes in maternal immunization. Data for rates of decay of maternal antibody and seroconversion after measles vaccination for infants born to naturally immune (Group 1) or vaccinated (Group 2) mothers have been used to evaluate two vaccination schedules: Regime 1, measles-mumps-rubella (MMR) at 1 year of age and Regime 2, monovalent measles at 6 months followed by MMR at 15 months of age. Regime 2 costs less because MMR can be administered at 15 months with the last pentavalent booster. Months of protection/1000 children aged 0-15 months (child-months of protection) were estimated for infant populations ranging from 0 to 100% Group 1 for Regimes 1 and 2. Regime 1 provides more child-months of protection only for 100% Group 1 populations. For the study population Regime 2 provided at least 17% more child-months of protection than Regime 1. Regime 2 provides increased medical and financial benefits in proportion to the number of Group 2 infants in the population and thus is ever more advantageous for today's increasingly vaccinated populations. 相似文献
132.
133.
PM Napoli 《The Journal of communication》1999,49(4):7-34
This article presents an examination of the diversity principle in communications policy. Given the Federal Communication Commission's recent emphasis on diversity as a policy objective, diversity assessments must return to the forefront of communications policy analysis. To provide an analytical framework for such research, the diversity principle is broken into three distinct components (source, content, and exposure diversity), and multiple subcomponents. In the spirit of the FCC's empirical commitment to the diversity principle, this analysis focuses on diversity as a measurable concept, with potentially interacting dimensions and numerous means of assessment. 相似文献
134.
The purpose of this study was to compare effects on rat bone and uterus of estrogen depletion and exposure to the coplanar PCB-congener 3,3',4,4',5-pentachlorobiphenyl (PCB #126) which exhibits anti-estrogenic properties. Half of the rats were ovariectomized (n = 20) and the other half were sham-operated. Ten of the ovariectomized rats and ten of the sham operated were exposed to PCB #126 (ip injections) for 3 months (total dose: 384 microgram/kg body wt). The remaining control rats were injected with corn oil (vehicle). The rats were killed and the tibiae and uteri were dissected. The left tibia was used for measurements of weight, length, and bone mineral density and the right for histomorphometrical analysis. The uteri were analyzed with respect to estrogen receptor content. PCB #126 exposure did not affect bone mineral density or trabecular bone volume of tibia in sham-operated rats. In ovariectomized rats PCB #126 exposure resulted in a decreased length and an increased bone mineral density of tibia. An obvious PCB #126 induced increase in osteoid surface was observed in sham-operated rats. The cortical thickness and the organic content of the tibia were also increased in these rats. In estrogen deprived tissue like the uteri of ovariectomized rats, PCB #126 showed weak estrogen agonistic activity. The observed effects of PCB #126 on bone and uterine tissues differed between ovariectomized and sham-operated rats. 相似文献
135.
A Grakoui DL Donermeyer O Kanagawa KM Murphy PM Allen 《Canadian Metallurgical Quarterly》1999,162(4):1923-1930
We examined the role of the peptide/MHC ligand in CD4+ T cell differentiation into Th1 or Th2 cells using a TCR alphabeta transgenic mouse specific for hemoglobin (Hb)(64-76)/I-Ek. We identified two altered peptide ligands of Hb(64-76) that retain strong agonist activity but, at a given dose, induce cytokine patterns distinct from the Hb(64-76) peptide. The ability of these peptides to produce distinct cytokine patterns at identical doses is not due to an intrinsic qualitative property. Each peptide can induce Th2 cytokines at low concentrations and Th1 cytokines at high concentrations and has a unique range of concentrations at which these distinct effects occur. The pattern of cytokines produced from limiting dilution of naive T cells demonstrated that the potential to develop an individual Th1 or Th2 cell is stochastic, independent of Ag dose. We propose that the basis for the observed effects on the Th1/Th2 balance shown by the altered peptide ligands and the amount of Ag dose involves the modification of soluble factors in bulk cultures that are the driving force that polarize the population to either a Th1 or Th2 phenotype. 相似文献
136.
137.
138.
PM Gardner JM Jentzen RA Komorowski JM Harb 《Canadian Metallurgical Quarterly》1997,111(12):1171-1173
Neurogenic tumours of the larynx are unusual, with approximately 115 cases reported in the literature to date. Most of these lesions are benign, solitary submucosal nodules which present with hoarseness and are amenable to surgical resection. We present a case of a large pedunculated schwannoma arising in the aryepiglottic fold associated with sudden asphyxial death in an otherwise healthy young female. 相似文献
139.
140.
Single strand conformation polymorphism (SSCP) analysis using ethidium bromide can be improved by adding formamide as the denaturant. This gives higher resolution than previous SSCP methods; it had 100% sensitivity in the discrimination of 14 PCR samples from two different genes, even for a long fragment close to the upper limit of 250 base pairs. This modified procedure is a rapid, simple, safe, and yet highly sensitive method for detecting structural differences in DNA fragments. 相似文献