全文获取类型
收费全文 | 103篇 |
免费 | 7篇 |
国内免费 | 24篇 |
专业分类
电工技术 | 9篇 |
综合类 | 4篇 |
化学工业 | 12篇 |
金属工艺 | 18篇 |
机械仪表 | 3篇 |
建筑科学 | 6篇 |
轻工业 | 29篇 |
水利工程 | 1篇 |
石油天然气 | 3篇 |
一般工业技术 | 28篇 |
冶金工业 | 2篇 |
原子能技术 | 10篇 |
自动化技术 | 9篇 |
出版年
2019年 | 1篇 |
2018年 | 6篇 |
2017年 | 2篇 |
2016年 | 2篇 |
2015年 | 1篇 |
2013年 | 13篇 |
2012年 | 3篇 |
2011年 | 7篇 |
2010年 | 3篇 |
2009年 | 2篇 |
2008年 | 8篇 |
2007年 | 3篇 |
2006年 | 6篇 |
2005年 | 4篇 |
2004年 | 5篇 |
2003年 | 10篇 |
2002年 | 3篇 |
2001年 | 4篇 |
2000年 | 2篇 |
1999年 | 1篇 |
1998年 | 2篇 |
1997年 | 11篇 |
1996年 | 2篇 |
1995年 | 3篇 |
1994年 | 3篇 |
1993年 | 4篇 |
1992年 | 3篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1988年 | 4篇 |
1987年 | 3篇 |
1986年 | 1篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1979年 | 1篇 |
1973年 | 1篇 |
1970年 | 1篇 |
1969年 | 1篇 |
1967年 | 1篇 |
排序方式: 共有134条查询结果,搜索用时 15 毫秒
1.
Y. MURAKAMI K. TAKAHASHI R. KUSUMOTO 《Fatigue & Fracture of Engineering Materials & Structures》2003,26(6):523-531
ABSTRACT The fatigue crack growth behaviour of 0.47% carbon steel was studied under mode II and III loadings. Mode II fatigue crack growth tests were carried out using specially designed double cantilever (DC) type specimens in order to measure the mode II threshold stress intensity factor range, ΔKIIth. The relationship ΔKIIth > ΔKIth caused crack branching from mode II to I after a crack reached the mode II threshold. Torsion fatigue tests on circumferentially cracked specimens were carried out to study the mechanisms of both mode III crack growth and of the formation of the factory‐roof crack surface morphology. A change in microstructure occurred at a crack tip during crack growth in both mode II and mode III shear cracks. It is presumed that the crack growth mechanisms in mode II and in mode III are essentially the same. Detailed fractographic investigation showed that factory‐roofs were formed by crack branching into mode I. Crack branching started from small semi‐elliptical cracks nucleated by shear at the tip of the original circumferential crack. 相似文献
2.
EFFECTS OF VISCOSITY OF LIQUID FOODS ON PALATAL PRESSURE 总被引:1,自引:0,他引:1
The deglutition of non-Newtonian liquids introduced into the mouth was studied dynamically by measuring palatal pressure (P) with pressure transducers set at three locations on the palate. The value of P and the swallowing pressure (S) changed only from 100 to 200 g/cm2 over the viscosity range 10−2 to 101 Pa.s. The retaining time (T) and work (W), required for swallowing after the liquid entered the mouth, remained almost constant up to a critical value of 1.0 Pa.s. above which both T and W increased markedly. When the viscosity was low, all of the liquid was swallowed in one deglutition, up to 15 mL volume. Therefore, T was almost constant but S increased with the volume. When the viscosity was high, the liquid was swallowed in several smaller portions. When the volume was high, T increased and S was either constant or it decreased. 相似文献
3.
展望21世纪新技术革命中的传感器 总被引:5,自引:2,他引:3
在回顾了以往产业革命中传感器的作用 ,比较工程传感器与人的感官的异同点之后 ,阐述了预计将于 2 1世纪爆发的新产业革命中传感器的使命及发展趋势 相似文献
4.
5.
YUKIHIKO TAKAHASHI 《哈尔滨工业大学学报(英文版)》2011,18(2):61-66
Effects of nutrients released from sediments on eutrophication in lakes and reservoirs were not well known in China. In the test, the release conditions of nitrogen and phosphorus from the sediments were observed by batch experiment. The test results revealed that the content released is correlated to the initial content of organic matter in sediments. In the Gengjing area, when the water quality of waterway, grit chamber and reservoir were compared, the water quality of the waterway was the highest, and lowered in the order of the grit chamber and the reservoir. The grit chamber could get not only fine sand removal but also the organic substance, nitrogen, phosphorus and phytoplankton, therefore it is important to operate and maintain the grit chamber to preserve the water quality of the reservoir. Due to little organic substance in sediments, ammonium nitrogen and phosphorus weren’t released during the incubation. But from the absorptiometric turbidity unit (ATU) test results, although the release of ammonium concentration was very low, ammonium oxidizing and nitrite oxidizing bacteria existed in sediments. 相似文献
6.
针对日本国鬼怒河流域小流量河流,通过对河床上附着生物膜的组成、底栖生物、细菌活性分析和AGP试验,研究了污水厂二级处理排放水对小流量河流生态的影响.研究表明,当污水厂二级处理排放水占河流流量比例较大时(研究河流所占比例为35%),同样会引发河流富营养化和影响河流水体的生态.因此,从保护水环境及其生态考虑,有必要对污水进行深度处理. 相似文献
7.
8.
M. ONO W. NAKAO K. TAKAHASHI M. NAKATANI K. ANDO 《Fatigue & Fracture of Engineering Materials & Structures》2007,30(7):599-607
Structural ceramics are brittle and sensitive to flaws. As a result, the structural integrity of a ceramic component may be seriously affected by inherent flaws. Self-crack-healing is an excellent answer to this problem. At the moment, however, there is no technique to heal embedded flaws. Therefore, a technique to guarantee the reliability of ceramic components is demanded, and thus a technique using crack healing followed by proof test was developed by K. Ando et al. to accomplish this. With this technique, testing the mechanical behaviour of the crack-healed zone is very important for ensuring the structural integrity of a ceramic component. In this study, first Al2O3/SiC composite with an excellent crack-healing ability was sintered. Second, a crack was introduced on the sample (3 mm × 4 mm × 36 mm), which reduced the bending strength by about 80%, and subsequently the crack was healed. Third, a proof test was carried out on the crack-healed sample. Last, using the crack-healed and proof-tested sample, a fracture test was carried out up to 1373 K. The measured minimum fracture stress (σFmin) was compared with the theoretical minimum strength (σG) from room temperature (R.T.) to 1373 K. It was concluded that σG showed good agreement with σFmin up to 1373 K and that the crack healing followed by proof test was an excellent technique to increase the survival probability by administering a proof test and to guarantee the reliability of Al2O3/SiC composite. 相似文献
9.
利用氢离子(H+)束和电子(e-)束双束(H+/e-)同时辐照用化学浸润法制备的新型12Cr-ODS铁素体钢,研究其辐照损伤效应及组织变化。实验结果表明:由于氧化物的钉扎,基体内保持低密度位错网络;辐照初期随辐照剂量的增加,缺陷团在位错线上及其周围形成,尺寸增加,密度不断增大,并形成间隙型位错环;不同温度下辐照均产生小尺寸高密度的空洞,随辐照剂量的增大,空洞长大速度降低,空洞密度缓慢减小;不同温度下,辐照剂量达15dpa时,空洞肿胀均小于0.15%。对辐照产生的点缺陷与氢相互作用进行理论分析,12Cr-ODS铁素体钢在623~823K经双束辐照后,表现出良好的抗辐照损伤性。 相似文献
10.
采用超高压电镜与离子加速器相连结的复合辐照装置,研究了注He对低活性Fe-Cr-Mn(W,V)合金辐照产生的点缺陷及二次缺陷行为的影响.实验结果表明:辐照初期形成的点缺陷与He相互作用,进而影响二次缺陷(位错、位错环和空洞)的形成;He明显促进位错密度增大和空洞核心形成,并导致空洞肿胀增加.对辐照产生的点缺陷与He相互作用的机理进行了理论分析。 相似文献