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He Enguang Gong Shuili Wu Bing Chen Li Science Technology on Power Beam Processes Laboratory AVIC Beijing Aeronautical Manufacturing Technology Research Institute Beijing China 《稀有金属材料与工程》2011,(Z4):130-133
The residual stress of T-joints for SUS304 stainless steel by YAG laser welding was measured by the method of hole-drilling,and the effects of heat treatment and hardness distribution of weld joints on the distribution of residual stress for T-joints were analyzed.The results showed that the maximum of longitudinal residual tensile stress for T-joints was about 140MPa.The maximum of residual stress was not more than 40MPa after heat treatment,the peak of residual stress reduced obviously.The gradient of residual stress distribution was also reduced significantly.Strain hardening phenomenon occurred for T-joints,and the hardness of weld and heat affected zone was both higher than the hardness of base metal,the peak of hardness occurred in the fusion line.The effect of strain hardening phenomenon of weld and heat affected zone on the residual stress distribution of T-joints for SUS304 stainless steel was obvious,which made longitudinal residual tensile stress become higher. 相似文献
3.
SATOH Takahiro 《核技术(英文版)》2011,(5):282-286
In this paper,we report a novel measurement system based on the development of Fudan Scanning Proton Microscopy(SPM) facility.By using Si-PIN diode(Hamamatsu S1223-01) detector,scanning transmission ion microscopy(STIM) measurement system has been set up.It can provide density and structural images with high probing efficiency and non-destruction by utilizing the energy loss of high energy(MeV) and focused ions penetrating through a thin sample.STIM measurement is able to map the density distribution of organic elements which mostly compose biology materials,such information can not be detected by using conventional Be-windowed Si(Li) X-ray detector in Particle Induced X-ray Emission(PIXE) technique.The spatial resolution capability of STIM is higher than PIXE technique at same accelerator status.As a result of STIM measurement,Paramecium attached on the top of Kapton tube was measured by STIM. 相似文献
4.
CHEN KeFan DENG JianHua ZHAO Fei CHENG GuoAn &ZHENG RuiTing Key Laboratory of Beam Technology Material Modification of Ministry of Education College of Nuclear Science Technology Beijing Normal University Beijing China 《中国科学:信息科学(英文版)》2010,(3)
The structures and field emission properties of multi-walled carbon nanotube arrays implanted with Zn+ by MEVVA ion implanter have been investigated.The results revealed that Zn+implantation induced structural damage and that the top of carbon nanotubes with multi-layered graphite structure were transformed into carbon nanowires with amorphous structure.Meanwhile,C:Zn solid solution was synthesized after Zn+ implantation.The turn-on field and threshold field were 0.80 and 1.31 V/μm,respectively for original... 相似文献
5.
根据490个构件的试验结果和有限元分析计算,证实深梁的工作性能与一般梁不同,正截面应变不符合平截面假定,且在斜裂缝出现后的受力模型为拉杆拱。深梁的破坏形态为弯曲,剪切或弯剪破坏,但局压或锚固破坏较一般梁严重。以试验数据为基础,分析了有关参数的作用,提出了正截面强度、斜截面强度和抗裂度的回归公式与设计式,截面限制条件以及弯剪界限配筋率计算公式。这些经验公式与试验结果符合良好,设计式简便可行。此外,还对局压计算、最小配筋率、锚固长度及构造要求提出了试验分析意见与建议。 相似文献
6.
Genetic Transformation of Watermelon with Pumpkin DNA by Low Energy Ion Beam-mediated Introduction 总被引:6,自引:0,他引:6
The No.601 watermelon (citrullus lanatus) seeds were treated with 25 keV N+ implantation at the dosage of 7.8*10 ions/cm2 . After treatment, watermelon seeds were incubated with 380 *g/*l pumpkin (Cucubita, maxima Duch) DNA solution at 35* for 5 hours. By two-generations of selection and resistance screening at seedling stage, one transformed material was selected out, whose rind color is similar to that of the donor pumpkin and whose size of seeds is between that of the donor and the receptor. Using AFLP (amplified fragment length polymorphism) technique, two polymorphic DNA fragments were amplified. This primarily testified that the donor DNA fragments/gene were introduced into the receptor cell and integrated into the genomic DNA of the receptor. 相似文献
7.
WANG Xi YANG Genqing LIU Xianghuai ZHENG Zhihong HUANG Wei ZHOU Zuyao ZOU Shichang Ion Beam Laboratory Shanghai Institute of Metallurgy Academia Sinica shanghai China 《金属学报(英文版)》1992,5(11):370-374
A new method for preparation of hard TiN films has been developed by using electronbeam evaporation-deposition of Ti and bombardment with 40 keV Xe~+ ion beam ina N_2 gas environment.The synthesized TiN films were superior to PVD and CVDones in respects of improved adhesion to substrate and low preparing temperature.Theyexhibited good wear resistance and high hardness up to 2200 kg/mm~2.Some industrialapplications have been reported. 相似文献
8.
0IntroductionCompared with conventional welding methods,laserwelding has many advantages,such as large penetrationratio,small HAZ,small welding deformation.Another ad-vantage of laser welding is easy to weld complicated com-ponents because laser can be transferred by mirrors andoptical fiber.The laser welding will find wide applicationswith the laser system developing.Induced-plasma,molten pool and keyhole are mainphenomena in study of laser welding process.The varietiesof them indicate the … 相似文献
9.
本文研究Zr薄膜在等离子体作用下的氢化特性,测试表明,与分子氢相比,氢等离子体作用下氢化速率明显增高,在室温和≈2Pa氢压的DC放电条件下,氧化10min样品的氢化浓度可达饱和值,即66.67(原子分数,%),远大于该压强下的气体氢化浓度,在非超清洁系统中,等离子体氢化在样品表面产生大量的氧污染和少量的碳污染,少量的表面氧化物并不阻碍等离子体氢化,但随着污染的增加,氢化浓度却大大减少,Ni对样品表面氢分子解离吸附和氢原子再结合逸出有着不同程度的催化作用,在低的放电压强和放电电流下,表面镀Ni使Zr的稳态氢化浓度减小,而在高压强、低电流下,表面镀Ni可增加Zr的氢化效率。 相似文献
10.