全文获取类型
收费全文 | 41篇 |
免费 | 0篇 |
专业分类
电工技术 | 2篇 |
化学工业 | 7篇 |
金属工艺 | 1篇 |
能源动力 | 2篇 |
无线电 | 11篇 |
一般工业技术 | 9篇 |
冶金工业 | 7篇 |
原子能技术 | 1篇 |
自动化技术 | 1篇 |
出版年
2018年 | 1篇 |
2016年 | 1篇 |
2015年 | 1篇 |
2014年 | 1篇 |
2013年 | 1篇 |
2012年 | 1篇 |
2011年 | 3篇 |
2010年 | 1篇 |
2009年 | 2篇 |
2007年 | 1篇 |
2006年 | 1篇 |
2005年 | 2篇 |
2004年 | 1篇 |
2003年 | 1篇 |
2000年 | 1篇 |
1998年 | 3篇 |
1997年 | 3篇 |
1996年 | 1篇 |
1995年 | 1篇 |
1993年 | 3篇 |
1992年 | 4篇 |
1991年 | 3篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1983年 | 1篇 |
排序方式: 共有41条查询结果,搜索用时 15 毫秒
1.
Extensive creep cavitation in Ti, Nb and Cu containing precipitation hardened austenitic steels was found to limit the usefulness of deformation resistance to increase long-term creep rupture strength. The steels were microalloyed with boron and cerium that resulted in increase in creep rupture strength and ductility of the steels significantly. Grain boundary sliding and creep cavity nucleation and growth in the steels were suppressed greatly on microalloying. Auger spectroscopic analysis revealed the segregation of boron instead of sulfur on cavity surface and the absence of sulfur contamination of grain boundary upon the microalloying. Suppression of creep cavitation through the control of trace elements segregation along with the precipitation hardening increased the creep rupture strength of austenitic stainless steels. 相似文献
2.
Monotonic and cyclic loading tests on strain rate changes are conducted on
— 1Mo steel at 600°C. The examination of the tensile stress-strain response suggests that the viscosity function which characterizes the rate-dependency in the viscosity theory used previously at room temperature should not only depend on the overstress but also on the strain. A new extended viscosity control function is introduced to represent such strain dependency.The material constants of this modified viscoplasticity model are determined at temperatures of 25°C to 600°C and the model is applied to deformation tests on
— 1Mo steel carried out under time-varying temperature conditions and other conditions.The extended viscoplasticity theory is shown to reproduce such various experimentally observed stress-strain behavior at elevated temperatures. 相似文献
3.
Effects of filtration through activated carbons on peroxide,thiobarbituric acid and carbonyl values of autoxidized soybean oil 总被引:1,自引:0,他引:1
Keito Boki Tetsuyuki Wada Shinsaku Ohno 《Journal of the American Oil Chemists' Society》1991,68(8):561-565
Effects of filtration bleaching on peroxide value (PV), thiobarbituric acid value (TAV) and carbonyl value (CV) of autoxidized
soybean oil were investigated by using twenty-three kinds of activated carbon in order to improve oil quality. From the decreases
in PV, TAV and CV and from the physical and chemical properties of activated carbons, it was suggested that hydroperoxides,
aldehydes and ketones were adsorbed on the acid sites distributed over the surface or within the pores of the activated carbons
while the autoxidized soybean oil flowed through the packed column. The residual tocopherols in autoxidized soybean oil and
treated soybean oil were determined during storage. The decrease in oxidative stability of treated soybean oil seemed to be
caused by elimination ofα-,β-andγ-tocopherols.δ-Tocopherol was chemically more stable thanα-,β- andγ-tocopherols in autoxidized soybean oil. 相似文献
4.
5.
A. Giordana O. J. Glembocki E. R. Glaser D. K. Gaskill C. S. Kyono M. E. Twigg M. Fatemi B. Tadayon S. Tadayon 《Journal of Electronic Materials》1993,22(12):1391-1393
The results from an in-depth characterization of as-grown and annealed low-temperature GaAs layers deposited at less than
260°C are presented. The layers, amorphous as grown, became crystalline after annealing. The crystallization was documented
by several characterization techniques including photoreflectance, Raman spectroscopy, photoluminescence, transmission electron
microscopy, and double-crystal x-ray diffraction. The n-type conductivity of the annealed films was exploited for the construction
of a diode structure. 相似文献
6.
Nagasako-Akazome Y Kanda T Ohtake Y Shimasaki H Kobayashi T 《Journal of oleo science》2007,56(8):417-428
We performed a randomized double-blind, placebo-controlled study on moderately obese male and female subjects (71 subjects) with a body mass index ranging from 23 to 30 to evaluate the efficacy of 12-week intake of polyphenols extracted from apples and hop bract (600 mg/day). We confirmed that 12-week ingestion of polyphenol-containing capsules significantly decreased total cholesterol and LDL-cholesterol levels. The effects of the apple polyphenol-containing capsules were more marked than those of the hop bract polyphenol-containing capsules. The visceral fat area and the level of adiponectin in the group administered apple polyphenols improved in comparison with the control group. Blood and physical examinations revealed on clinical problems, and no adverse reactions were observed during the ingestion period. These results demonstrate that apple polyphenols regulate fat metabolism in healthy subjects with relatively high body mass index. 相似文献
7.
To improve diagnostic sensitivity for detecting low-level asbestos exposure (AEx) in patients, a new method was developed using an analytical transmission electron microscope (ATEM) for specimens of transbronchial lung biopsy (TBLB). The TBLB specimens from 28 patients were examined and the results were: 1) In cases with long-term AEx, the present method detected a large amount of asbestos fibers (AF) as well as asbestos bodies (AB) showing a good agreement with the results of light microscope (LM) which detected definite amounts of ferruginous bodies (FB). 2) In cases with short-term or suspected AEx, the LM failed to detect FB in some cases, but an appreciable amount of AF was detected using the present method, and AEx was disclosed through a second close interview. 3) Neither AB nor AF were detected in most of the cases without any dust exposure. Although small amounts of chrysotile fibers were observed in some cases, this might simply reflect the exposure level of urban dwellers. These results show that the ATEM applied to the TBLB specimens promises to confirm low-level AEx in such small specimens even if the patients were unaware of their past AEx. 相似文献
8.
Kyono C.S. Binari S.C. Kruppa W. Ikossi-Anastasiou K. Hier H.S. 《Electronics letters》1992,28(15):1388-1390
A seven monolayer AlAs layer was used as an etch stop at the emitter-base heterojunction of an Npn In/sub 0.52/Al/sub 0.48/As/In/sub 0.53/Ga/sub 0.47/As HBT. The etch-stop HBTs displayed higher DC gain and similar microwave performance when compared to devices without the AlAs layer.<> 相似文献
9.
We show how non-reciprocity and topology are used to construct an optical one-way waveguide in the Voigt geometry. First, we present a traditional approach of the one-way waveguide of light using surface polaritons under a static magnetic field. Second, we explain a recent discovery of a topological approach using photonic crystals with the magneto-optical coupling. Third, we present a combination of the two approaches, toward a broadband one-way waveguide in the microwave range. 相似文献
10.
Kiyokawa Tetsuyuki; Williams Diane P.; Snider Catherine E.; Strom Terry B.; Murphy John R. 《Protein engineering, design & selection : PEDS》1991,4(4):463-468
We have used site-directed insertion and point mutagenesis inan attempt to increase the cytotoxic potency and receptor-bindingaffinity of the diphtheria-toxin-related interleukin-2 (IL-2)fusion toxins. Previous studies have demonstrated that boththe DAB486-IL-Z and DAB389-IL-2 forms of the fusion toxin consistof three functional domains: the N-tenninal fragment-A-assodatedADP-ribosyltransferase, the hydrophobk-membrane-associatingdomains, and the C-terminal receptor-binding domain of humanIL-2. By insertion mutagenesis we have increased the apparentflexibility of the polypeptide chain between the membraneassociatingdomains and the receptor-binding domain of this fusion toxin.In comparison to DAB486-IL-2, the cytotoxic potency of the insertionmutants was increased by 17-fold for high-affinity IL-2-receptor-bearingcell lines in vitro. Moreover, competitive displacement experimentsusing [125I]rIL-2 demonstrate that the increase in cytotoxicpotency correlates with an increase in receptor-binding affinityfor both the high and intermediate forms of the IL-2 receptor. 相似文献