全文获取类型
收费全文 | 1190篇 |
免费 | 25篇 |
国内免费 | 7篇 |
专业分类
电工技术 | 69篇 |
综合类 | 6篇 |
化学工业 | 422篇 |
金属工艺 | 41篇 |
机械仪表 | 22篇 |
建筑科学 | 20篇 |
能源动力 | 50篇 |
轻工业 | 66篇 |
水利工程 | 2篇 |
石油天然气 | 4篇 |
无线电 | 65篇 |
一般工业技术 | 255篇 |
冶金工业 | 82篇 |
原子能技术 | 42篇 |
自动化技术 | 76篇 |
出版年
2023年 | 7篇 |
2022年 | 6篇 |
2021年 | 18篇 |
2020年 | 9篇 |
2019年 | 5篇 |
2018年 | 13篇 |
2017年 | 13篇 |
2016年 | 11篇 |
2015年 | 18篇 |
2014年 | 32篇 |
2013年 | 65篇 |
2012年 | 30篇 |
2011年 | 70篇 |
2010年 | 48篇 |
2009年 | 59篇 |
2008年 | 65篇 |
2007年 | 43篇 |
2006年 | 49篇 |
2005年 | 53篇 |
2004年 | 26篇 |
2003年 | 34篇 |
2002年 | 38篇 |
2001年 | 21篇 |
2000年 | 25篇 |
1999年 | 19篇 |
1998年 | 58篇 |
1997年 | 22篇 |
1996年 | 26篇 |
1995年 | 22篇 |
1994年 | 17篇 |
1993年 | 17篇 |
1992年 | 15篇 |
1991年 | 19篇 |
1990年 | 14篇 |
1989年 | 22篇 |
1988年 | 14篇 |
1987年 | 10篇 |
1986年 | 18篇 |
1985年 | 14篇 |
1984年 | 17篇 |
1983年 | 27篇 |
1982年 | 15篇 |
1981年 | 16篇 |
1980年 | 15篇 |
1979年 | 19篇 |
1978年 | 14篇 |
1977年 | 6篇 |
1974年 | 5篇 |
1972年 | 4篇 |
1969年 | 3篇 |
排序方式: 共有1222条查询结果,搜索用时 15 毫秒
31.
32.
Martensitic stabilization caused by deformation in a TiNi shape memory alloy was studied.Special attention was paid to the deformed microstructures to identify the cause of martensitic stabilization.Martensitic stabilization was demonstrated by differential scanning calorimetry for the tensioned TiNi shape memory alloy.Transmission electron microscopy revealed that antiphase boundaries were formed because of the fourfold dissociation of[110]B19'super lattice dislocations and were preserved after reverse transformation due to the lattice correspondence.Martensitic stabilization was attributed to dislocations induced by deformation,which reduced the ordering degree of the microstructure,spoiled the reverse path from martensite to parent phase compared with thermoelastic transformation,and imposed resistance on phase transformation through the stress field. 相似文献
33.
Mechanically Robust and Self‐Healable Superlattice Nanocomposites by Self‐Assembly of Single‐Component “Sticky” Polymer‐Grafted Nanoparticles 下载免费PDF全文
34.
Tetsuo Suga Yasuoa Murai Taizo Kobashi Kunika Ueno Minoru Shindo Katsunori Kanno 《Welding International》2016,30(3):166-174
In many industries, there are applications that require the joining of stainless steel and copper components; therefore, the welding of dissimilar stainless steel/copper joints is a common process. For this investigation, the optimal brazing conditions and suitable filler metals for laser brazing of stainless steel/copper lap joints were studied. Tensile shear force increases with increases in the laser spot diameter or in the laser irradiation angle, which is associated with increased bonding width; however, as bonding width approaches 2 mm, tensile shear force reaches a saturated value due to fracturing at the HAZ of the Cu base plate. In order to obtain joints with high tensile shear strength, laser brazing was optimized by using Cu–Si-based filler metal under the following conditions: laser power, 4 kW; spot diameter, 3 mm; laser irradiation angle, 80°; irradiation position shift, 0.6 mm; brazing speed, 0.30 m/min; and filler metal feed speed, 0.30 min. Concerning filler metals, it was found that the Ni–Cu type showed relatively large tensile shear force even at high welding speeds in comparison with those of the Cu–Si, Cu, Cu–Ni, Ni–Cu and Ni types, respectively. 相似文献
35.
Yuji Higaki Ryosuke Okazaki Tatsuya Ishikawa Moriya Kikuchi Noboru Ohta Atsushi Takahara 《Polymer》2014
The chain stiffness and local chain conformation of atactic poly(α-methylene-γ-butyrolactone) (PMBL), which is a side chain cyclic structural analog of poly(methyl methacrylate) (PMMA), with a weight-average molecular weight (Mw) ranging from 2.8 × 103 to 2.6 × 106 in N,N-dimethylformamide (DMF) and γ-butyrolactone (GBL) were characterized by size exclusion chromatography with a multi-angle light-scattering detector (SEC-MALS) and synchrotron radiation small-angle X-ray scattering (SAXS). Based on the Kratky-Porod worm-like chain model, the scattering functions and the Mw dependence of z-average root-mean-square radius of gyration <S2>z1/2 yielded the Kuhn segment lengths λ−1, the diameter of the PMBL chains d, and the excluded-volume strengths in DMF and GBL. The local conformation of atactic PMBL in DMF and GBL were slightly larger than those of atactic PMMA, due to the presence of the conformationally rigid lactone ring structure. 相似文献
36.
Tsuyoshi Kiyotsukuri Nobuhisa Takemoto Naoto Tsutsumi Wataru Sakai Minoru Nagata 《Polymer International》1996,40(1):17-23
Network copolyesters were prepared from trimesic (Y), pyromellitic (X) or mellitic (YH) acids and 1,6-hexanediol (6G). Prepolymers prepared by meltpolycondensation were cast from dimethylformamide solution and postpolymerized at 260°C for 6h to form a network. The resultant films were transparent, flexible and insoluble in any organic solvents. Degree of reaction estimated from the infrared absorbance of ester and methylene groups was almost the same for all films, 94–96%. X-ray diffraction intensity curves and densities showed that the ordering of networks was decreased by the copolymerization, which was remarkable for 6G–X/YH copolymer films and was consistent with the higher decreases of heat-distortion temperature for these copolymer films. The copolymerization also caused decrease of thermal stability, tensile properties and alkali resistance and increase of dye absorption. 相似文献
37.
Kadota M Imanaka M Hino S Nanba J Take S Nakazawa H 《Shokuhin eiseigaku zasshi. Journal of the Food Hygienic Society of Japan》2003,44(1):69-72
An analytical method was developed for determination of residual avoparcin in chicken muscle by measuring alpha- and beta-avoparcin, major components of the pharmaceutical preparation avoparcin, using HPLC with UV and amperometric detectors. The analytical HPLC was run on a Cosmosil 5C18-AR column (4.6 mm x 25 cm) with a gradient formed from A: 2.5% acetic acid, 0.01 mol/L sodium heptane sulfonic acid-acetonitrile (88.5:11.5) (pH 4.0) and B: 2.5% acetic acid-acetonitrile (10:90), using UV and amperometric detection (AMD) with glassy-carbon electrode (+900 mV). Avoparcin was extracted from chicken muscle by homogenization with methanol-0.2 mol/L sulfuric acid (6:4) followed by centrifugation after pH adjustment to 4 with 1 mol/L sodium hydroxide. The supernatant was evaporated to dryness, and the residue was dissolved in water. The aqueous layer was adjusted to pH 4 by adding 1 mol/L sodium hydroxide. Then it was purified on a Sep-Pak tC18 plus ENV cartridge. The cartridge was washed with water, and retained substances were eluted with 50% methanol. The eluate was evaporated to dryness under reduced pressure. The residue was dissolved in water and determined by HPLC. Recoveries of avoparcin spiked in chicken muscle were 73.1-88.1% at levels of 2-10 micrograms/g. The detection limits were 0.5 microgram/g (UV) and 0.2 microgram/g (AMD). 相似文献
38.
A series of novel hexene‐1–propylene random copolymers with isotactic sequence of propylene was synthesized with a MgCl2‐supported Cr(acac)3 catalyst. The molecular weight distribution of copolymers and homopolymers was considerably narrower than that of typical polyolefins produced by heterogeneous Ziegler–Natta catalysts. The crystallizability of the copolymers having a propylene‐unit content of more than 50 mol % drastically decreased with decreasing propylene‐unit content, and the copolymers with a propylene content of less than 50 mol % were completely amorphous. In the present novel type of random copolymers with crystallizable and noncrystallizable units, a single glass transition was observed between pure polypropylene and polyhexene‐1, and a major component was found to govern the final morphology and the mechanical characteristics. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 2949–2954, 2004 相似文献
39.
Minoru Goto 《International Journal of Mechanics and Materials in Design》2018,14(3):313-327
This work reports the characteristics and tribological properties of both Ag/DLC nanocomposite coatings (RF-Ag-DLC) and Cu/DLC nanocomposite coatings (RF-Cu-DLC) with hydrogen-free DLC matrix deposited by RF magnetron sputtering using a concentric composite target (CCT). The CCT consisted of a C base target and metal tablet, and the tablet was located on the center of the base target concentrically where the etching rate by Ar ions is extremely low. By changing the diameter of Ag or Cu tablets in CCT, RF-Ag-DLC with an Ag concentration ranging from 6 to 65 at.% and RF-Cu-DLC with Cu concentration ranging from 7 to 75 at.% can be prepared. These coatings show a granular structure having Ag or Cu nano-crystals with a diameter ranging from 5 to 10 nm dispersed homogeneously in the hydrogen-free DLC matrix. The friction coefficient of DLC varied depending on the species and content of metal. The transition of the friction coefficient became stable when metal-rich tribofilms formed on the counterfaces. 相似文献
40.
Minoru Takahashi Shoji Uchida Yumi Yamada Kazuya Koyama 《Progress in Nuclear Energy》2008,50(2-6):269-275
In Pb–Bi-cooled direct contact boiling water small fast reactor (PBWFR), steam is generated by direct contact of feedwater with primary Pb–Bi coolant above the core, and Pb–Bi coolant is circulated by steam lift pump in chimneys. Safety design has been developed to show safety features of PBWFR. Negative void reactivity is inserted even if whole of the core and upper plenum are voided hypothetically by steam intrusion from above. The control rod ejection due to coolant pressure is prevented using in-vessel type control rod driving mechanism. At coolant leak from reactor vessel and feedwater pipes, Pb–Bi coolant level in the reactor vessel required for decay heat removal is kept using closed guard vessel. Dual pipes for feedwater are employed to avoid leak of water. Although there is no concern of loss of flow accident due to primary pump trip, feedwater pump trip initiates loss of coolant flow (LOF). Injection of high pressure water slows down the flow coast down of feedwater at the LOF event. The unprotected loss of flow and heat sink (ATWS) has been evaluated, which shows that the fuel temperatures are kept lower than the safety limits. 相似文献