全文获取类型
收费全文 | 1155篇 |
免费 | 29篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 4篇 |
综合类 | 2篇 |
化学工业 | 99篇 |
金属工艺 | 16篇 |
机械仪表 | 35篇 |
建筑科学 | 4篇 |
矿业工程 | 2篇 |
能源动力 | 13篇 |
轻工业 | 25篇 |
水利工程 | 1篇 |
石油天然气 | 1篇 |
无线电 | 107篇 |
一般工业技术 | 82篇 |
冶金工业 | 740篇 |
原子能技术 | 7篇 |
自动化技术 | 47篇 |
出版年
2023年 | 6篇 |
2022年 | 5篇 |
2021年 | 8篇 |
2020年 | 9篇 |
2019年 | 10篇 |
2018年 | 17篇 |
2017年 | 6篇 |
2016年 | 23篇 |
2015年 | 14篇 |
2014年 | 17篇 |
2013年 | 20篇 |
2012年 | 27篇 |
2011年 | 39篇 |
2010年 | 19篇 |
2009年 | 28篇 |
2008年 | 24篇 |
2007年 | 23篇 |
2006年 | 20篇 |
2005年 | 14篇 |
2004年 | 15篇 |
2003年 | 16篇 |
2002年 | 13篇 |
2001年 | 14篇 |
2000年 | 10篇 |
1999年 | 36篇 |
1998年 | 223篇 |
1997年 | 125篇 |
1996年 | 75篇 |
1995年 | 37篇 |
1994年 | 49篇 |
1993年 | 35篇 |
1992年 | 9篇 |
1991年 | 11篇 |
1990年 | 8篇 |
1989年 | 14篇 |
1988年 | 15篇 |
1987年 | 6篇 |
1986年 | 4篇 |
1985年 | 3篇 |
1983年 | 6篇 |
1982年 | 2篇 |
1981年 | 6篇 |
1980年 | 16篇 |
1979年 | 2篇 |
1978年 | 5篇 |
1977年 | 29篇 |
1976年 | 67篇 |
1975年 | 2篇 |
1966年 | 1篇 |
1955年 | 1篇 |
排序方式: 共有1185条查询结果,搜索用时 31 毫秒
71.
I Schrijver-Wieling GH van Rens D Wittebol-Post JA Smeitink JP de Jager HB de Klerk GH van Lith 《Canadian Metallurgical Quarterly》1997,81(4):291-294
We report a case of Bellini duct carcinoma of the left kidney with invasive growth pattern. A 39-year-old man was admitted to our hospital with the chief complaint of gross hematuria. Ultrasonography showed left renal swelling but normal reniform configuration of the kidney was maintained. Computed tomography demonstrated a low density tumor infiltrating into the renal cortex and with tumor extension into the renal vein. Renal angiography revealed a hypovascular tumor. We suspected a left renal cell carcinoma with tumor extension into the left renal vein, and performed radical nephrectomy. Macroscopically, the resected kidney had a normal outer contour. The tumor with infiltrative growth pattern existed in renal medulla. Histopathologic examination revealed a papillary adenocarcinoma originated in Bellini duct (pT3bN2M0). The patient underwent systemic chemotherapy (M-VAC). This case showed invasive growth pattern, which were different from the usual renal cell carcinoma and Bellini duct carcinoma. 相似文献
72.
73.
Jun-Hyuk Yim Youn Geun Jung Jong Sung Lim 《Korean Journal of Chemical Engineering》2010,27(1):284-288
High-pressure vapor-liquid equilibrium data were measured for the binary mixtures of CO2+n-propanol at various isotherms (313.15–343.15 K). The vapor and liquid compositions and pressures were measured in a circulation-type
apparatus. To facilitate easy equilibration, both vapor and liquid phases were circulated separately in the experimental apparatus
and the equilibrium composition was analyzed by an on-line gas chromatograph. The experimental data were compared with literature
results and correlated with the Peng-Robinson (PR) equations of state using the Wong-Sandler mixing rules. Calculated results
with PR EOS showed good agreement with our experimental data. 相似文献
74.
Monodisperse FePt nanoparticles with size of 4.5 and 6.0 nm were prepared by simultaneous reduction of platinum acetylacetonate
and thermal decomposition of iron pentacarbonyl in benzylether. The crystallography structure, size, and composition of the
FePt nanoparticles were examined by X-ray diffraction and transmission electron microscopy. Energy dispersive X-ray spectrometry
measurements of individual particles indicate a broad compositional distribution in both the 4.5 and 6 nm FePt nanoparticles.
The effects of compositional distribution on the phase-transition and magnetic properties of the FePt nanoparticles were investigated. 相似文献
75.
Hong Jae Yim Jae Hong Kim Sun-Jong Park Hyo-Gyoung Kwak 《Cement and Concrete Research》2012,42(11):1438-1446
Thermal damage in concrete usually induces contact-type defects, which result in degradation of the concrete's performance. This paper attempts to visualize the thermal damage in a multiscale, and characterizes the thermally damaged concrete using a nonlinear ultrasonic method. An impact-modulation method is used to obtain nonlinearity parameters, as a quantitative measure of contact-type defects, and shows better sensitivity than phase velocity variation as a linear ultrasonic method for thermally damaged concrete. The measured nonlinearity parameter is compared with the permeable pores, which reflect the occurrence of opening and pores in thermally damaged concrete. Degradation of concrete strength due to thermal damage is also assessed via the measurement. 相似文献
76.
77.
Materials issues in nuclear-waste management 总被引:1,自引:0,他引:1
Man-Sung Yim K. Linga Murty 《JOM Journal of the Minerals, Metals and Materials Society》2000,52(9):26-29
In this article, materials issues in the management of nuclear waste, including its generation, processing, storage, transport,
and disposal, are examined for low-level and high-level waste, with an emphasis on the aspects of their immobilization and
long-term isolation. Selecting materials for low-level and high-level waste form and containers is reviewed, and the long-term
performance issues with these materials as barriers to nuclide migration or release are discussed.
Editor’s Note: A hypertext-enhanced version of this article is available on the web at www.tms.org/pubs/journals/JOM/0009/Yim-0009.html.
For more information, contact M.-S. Yim, North Carolina State University, Department of Nuclear Engineering, Raleigh, North
Carolina 27695-7909; (919) 515-1466; fax (919) 515-5115; e-mail yim@ncsu.edu. 相似文献
78.
79.
80.
HB Huang YQ Song M Hsei R Zahorchak J Chiu C Teuscher EJ Smith 《Canadian Metallurgical Quarterly》1999,90(1):240-242
The development and partial characterization of turkey genomic libraries enriched for TG, GAT, and CCT simple sequence repeats (SSR) are described. The primary library, established using conventional methods, was enriched for each of the three SSR by single-primer polymerase chain reaction (PCR). The three enriched libraries were screened by standard hybridization and washing protocols under moderate to high stringency conditions. The utility of a fraction of the markers was evaluated based on the polymorphism of PCR-amplified products in a backcross reference DNA panel. The panel consisted of genomic DNA samples from three backcrossed families developed from a cross of a wild male turkey to three inbred Orlopp line C females. A total of 181 sequences from positive clones have been characterized and deposited in GenBank. About 60% of the 60 primer pairs designed from SSR-containing sequences detected polymorphism in the reference DNA panel. The turkey genomic DNA reference panel, the enriched libraries, and the markers described here provide an opportunity to begin to characterize the turkey genome and to develop a useful public genetic map for this economically important species. 相似文献