全文获取类型
收费全文 | 379篇 |
免费 | 8篇 |
专业分类
电工技术 | 14篇 |
化学工业 | 80篇 |
金属工艺 | 9篇 |
机械仪表 | 6篇 |
建筑科学 | 5篇 |
能源动力 | 8篇 |
轻工业 | 35篇 |
水利工程 | 2篇 |
无线电 | 39篇 |
一般工业技术 | 90篇 |
冶金工业 | 75篇 |
原子能技术 | 7篇 |
自动化技术 | 17篇 |
出版年
2022年 | 3篇 |
2021年 | 8篇 |
2020年 | 2篇 |
2019年 | 7篇 |
2018年 | 10篇 |
2017年 | 6篇 |
2016年 | 5篇 |
2015年 | 2篇 |
2014年 | 4篇 |
2013年 | 14篇 |
2012年 | 12篇 |
2011年 | 9篇 |
2010年 | 18篇 |
2009年 | 10篇 |
2008年 | 20篇 |
2007年 | 13篇 |
2006年 | 7篇 |
2005年 | 14篇 |
2004年 | 15篇 |
2003年 | 11篇 |
2002年 | 12篇 |
2001年 | 10篇 |
2000年 | 11篇 |
1999年 | 6篇 |
1998年 | 21篇 |
1997年 | 12篇 |
1996年 | 11篇 |
1995年 | 8篇 |
1994年 | 8篇 |
1993年 | 7篇 |
1992年 | 4篇 |
1991年 | 4篇 |
1990年 | 3篇 |
1989年 | 5篇 |
1988年 | 2篇 |
1987年 | 6篇 |
1986年 | 7篇 |
1984年 | 5篇 |
1983年 | 3篇 |
1982年 | 2篇 |
1981年 | 5篇 |
1980年 | 6篇 |
1979年 | 12篇 |
1978年 | 6篇 |
1977年 | 4篇 |
1976年 | 5篇 |
1975年 | 2篇 |
1974年 | 2篇 |
1973年 | 3篇 |
1971年 | 2篇 |
排序方式: 共有387条查询结果,搜索用时 437 毫秒
101.
Shimoyama N. Machida K. Takahashi J. Murase K. Minegishi K. Tsuchiya T. 《Electron Devices, IEEE Transactions on》1993,40(9):1682-1687
The authors point out that a TEOS/O3-oxide layer used as an interlevel dielectric enhances hot-carrier degradation of MOSFETs due to the water-related components (water and/or silanols) contained in the layer. This results mainly from enhanced hot-electron trapping in the gate oxide and also from interface-trap generation. By applying an ECR-SiO2 layer under the TEOS/O3-oxide layer, tolerance against hot-carrier damage is improved to the level of MOSFETs without the TEOS/O3 oxide. From ESR measurement results, it is found that the spin density of the ECR-SiO2 film under the TEOS/O3 oxide is two orders lower than that of the ECR-SiO 2 film only. It is suggested that the dangling bonds in the ECR-SiO2 film effectively trap water diffusing from the water-containing overlayer 相似文献
102.
K. Ogawa K. Joichi T. Kanemaru O. Sakurai A. Machida 《International journal of cosmetic science》2006,28(1):74-75
Young ladies in their 20s, as the representative age group, have a strong wish for a foundation that can provide a beautiful finish with natural skin-transparency and can allow the finish to last longer. In response to this wish, we have attempted to develop an ideal powder material that can yield the dual function described above. Based on the fundamental knowledge of the physiological and optical characteristics of human bare skin, we designed an optimal microstructure for powder with an ideal optical character. A hybrid powder, which is an interference-pearl type TiO2 /mica powder covered with a fiber-type ZnO by a morphologically controlled technology, was synthesized. The powder has a dual function. As a physico-chemical function, the powder can absorb and solidify sebum with its nano-scale fiber-type ZnO (diameter:approximately 50 nm) of which the microstructure is controlled at the crystalline level. As an optical character, the powder can reflect a diffuse interference red light wich is generated from the microstructure of the powder surface. A foundation containing the powder (8w/w%) can maintain the initial natural finishing with a beautiful transparency and give a dry-refreshing feeling for a significant period of time through its physico-chemical ability to absorb and solidify sebum on the skin. Since this new hybrid powder provides an optical character and a useful physico-chemical character, it has proven to be a valuable cosmetic ingredient of base-makeup products. 相似文献
103.
Hiroyuki Mizuta Kiichi Oda Yasuo Shibasaki Masaki Maeda Michihide Machida Kazuyuki Ohshima 《Journal of the American Ceramic Society》1992,75(2):469-473
A vacuum-pressure slip-casting technique and hot isostatic pressing (HIPing) were used to prepare high-strength and translucent alumina ceramics. A low-viscosity and high-solids-content slurry (46 vol% solids) was prepared, and a dense green compact was formed. The samples were sintered and subjected to capsule-free HIPing. Extremely high-density (99.9%) and fine-grained (0.7 to 15 μm in diameter) alumina ceramics were obtained. The HIPed samples showed high bend strength and translucency with in-line transmittance of 30% to 46% (1 mm thick). 相似文献
104.
A Kashimada K Machida N Honda T Mamiya T Takahashi T Kamano M Muramatsu Y Inoue 《Canadian Metallurgical Quarterly》1992,29(9):1127-1131
99mTc-ECD SPECT and 99mTc-HMPAO SPECT with or without Matas test were performed in a 62-year-old woman with meningioma in the left anterior cranial fossa. After injection of 740 MBq 99mTc-ECD or HMPAO, 64 projection images were collected with a rotating Gamma camera. Matas test was carried out by compressing the left common carotid artery for about one minute immediately after RI injection. Although 99mTc-ECD SPECT showed non-accumulation in the tumor, 99mTc-HMPAO SPECT demonstrated increased accumulation in it. This area of increased accumulation disappeared on 99mTc-HMPAO SPECT with Matas test which causes decrease in blood flow of the tumor. These findings suggest 99mTc-ECD and 99mTc-HMPAO have a different mechanisms of accumulation in the meningioma. 相似文献
105.
Yoshida S Taguchi S Tanaka Y Hori S 《Shokuhin eiseigaku zasshi. Journal of the Food Hygienic Society of Japan》2003,44(3):175-179
S-421 is a synergist for pyrethroid and organophosphorus pesticides, and is widely used in termiticides or commercial household insecticides. S-421 is mutagenic, stable and ubiquitous in the environment, and has been detected in household dust, surface water, sediments and rain-water. Here we describe the concentration of S-421 residues in domestic and imported fish collected in Osaka. S-421 was extracted with acetone/hexane, purified through silica gel 40 and quantified by ECD-GC. S-421 was detected in 36 out of 44 samples of domestic fish and shellfish analyzed, at a level of < 0.2 to 2.3 ng/g (mean: 0.6 ng/g), and in 27 out of 43 imported samples at a level of < 0.2 to 1.0 ng/g (mean: 0.2 ng/g). The levels of S-421 detected in fish were lower than those of DDTs and almost the same as those of HCHs. More attention should be paid to the behavior in the environment of S-421, as well as other persistent organochlorine pollutants, such as HCHs, DDTs and chlordane. 相似文献
106.
Prediction of simultaneous adsorption of Cu(II) and Pb(II) onto activated carbon by conventional Langmuir type equations 总被引:1,自引:0,他引:1
Removal of Cu(II) and Pb(II) by adsorption onto activated carbon was examined in single- and binary-component aqueous solutions representative of contaminated solutions containing heavy metals. Reversibility of adsorption of the heavy metals on the activated carbon was evaluated by desorption experiments. The number of the maximum adsorption sites and adsorption equilibrium constants of Cu(II) and Pb(II) were estimated by the results of single-component systems assuming the Langmuir adsorption model. The adsorption sites per gram of activated carbon resulted in similar values for Cu(II) and Pb(II) from the isotherms. The adsorption constant for Pb(II) was nearly 1.8 times greater than that of Cu(II). Rate constants of adsorption and desorption were also estimated from the kinetic analysis. Using the single set of common parameters obtained from the single-component systems, the experimental results for a binary-component system were quantitatively predicted. Competitive adsorption of Cu(II) and Pb(II) on the same adsorption sites was confirmed by both experimental and predicted results of adsorption in the binary mixture. 相似文献
107.
In an earlier paper a theory of superconductivity in ternary rare-earth compounds which examined the effects of elastic scattering of conduction electrons by localized 4f electrons was presented. In this paper the theory is extended by treating both elastic and inelastic scattering. Expressions for the phase diagram and the upper critical field are derived and compared with expressions from other theories.This work was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Materials Sciences Division. 相似文献
108.
This study examines the role of 1) personal job-related needs and 2) certain organizational characteristics in affecting overall job satisfaction for a sample of 259 laboratory professionals, primarily medical technologists. Specific individual needs and specific organizational characteristics were found to be related to three measures of overall job satisfaction. Additional comparisons were made for administrators versus non-administrators and for differences associated with different sized organizations. Implications for the managers of medical technologists and other laboratory professionals are discussed. 相似文献
109.
Okuyama M Kobayashi N Takeda W Anjo T Matsuki Y Goto J Kambegawa A Hori S 《Analytical chemistry》2004,76(7):1948-1956
To develop an enzyme-linked immunosorbent assay (ELISA) for monitoring the toxicity due to polychlorinated dibenzo-p-dioxins and dibenzofurans contaminated in human breast milk, we have generated novel monoclonal antibodies using some haptenic derivatives linked to bovine serum albumin via the C-1 or C-2 position on the dioxin skeleton. BALB/c or A/J mice were repeatedly immunized with the immunogen, and spleen cells were fused with P3/NS1/1-Ag4-1 myeloma cells. After five fusion experiments, a hybridoma clone was established that secretes an antibody D9-36 group specifically recognizing the major toxic congeners, 2,3,7,8-tetrachlorodibenzo-p-dioxin (2,3,7,8-TCDD), 1,2,3,7,8-pentachlorodibenzo-p-dioxin, and 2,3,4,7,8-pentachlorodibenzofran. An ELISA is developed on the basis of the competitive and labeled-antigen format. The toxic congeners extracted from butter or milk specimens by a novel extraction cartridge and a peroxidase-labeled dioxin analogue were sequentially reacted with a fixed amount of D9-36 in the presence of Triton X-100. The bound fraction was captured on a microtiter plate, immobilizing a second antibody, and the enzyme activity was colorimetrically determined. This ELISA afforded a practical sensitivity (measurable range, 1-100 pg/assay; detection limit, 1.0 pg/assay as 2,3,7,8-TCDD equivalent). The assay values for milk and butter samples were in reasonable accordance with the sum of the toxicity-equivalent quantity of each congener, which had been determined by a high-resolution gas chromatography/high-resolution mass spectrometry method. 相似文献
110.
The purpose of the present study was to examine the relevancy of the high throughput solubility assay and permeability assay to the biopharmaceutics classification system (BCS). Solubility and permeability were measured by high throughput solubility assay (HTSA) and parallel artificial membrane permeation assay (PAMPA), respectively. High throughput solubility assay was performed using simulated gastric fluid (SGF, pH 1.2) and simulated intestinal fluid without bile acid (SIF, pH 6.8). We categorize 18 drugs based on the BCS using HTSA and PAMPA. Fourteen out of 18 drugs were correctly classified (78% success rate). The result of the present study showed that HTSA could predict BCS class with a high success rate, and PAMPA could also be useful to predict the permeation of drugs. 相似文献