全文获取类型
收费全文 | 380篇 |
免费 | 13篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 8篇 |
综合类 | 1篇 |
化学工业 | 108篇 |
金属工艺 | 22篇 |
机械仪表 | 15篇 |
建筑科学 | 11篇 |
能源动力 | 8篇 |
轻工业 | 25篇 |
水利工程 | 1篇 |
石油天然气 | 1篇 |
无线电 | 29篇 |
一般工业技术 | 74篇 |
冶金工业 | 69篇 |
原子能技术 | 6篇 |
自动化技术 | 16篇 |
出版年
2023年 | 4篇 |
2022年 | 6篇 |
2021年 | 10篇 |
2020年 | 7篇 |
2019年 | 2篇 |
2018年 | 7篇 |
2017年 | 4篇 |
2016年 | 3篇 |
2015年 | 8篇 |
2014年 | 14篇 |
2013年 | 18篇 |
2012年 | 18篇 |
2011年 | 30篇 |
2010年 | 14篇 |
2009年 | 27篇 |
2008年 | 19篇 |
2007年 | 18篇 |
2006年 | 14篇 |
2005年 | 12篇 |
2004年 | 15篇 |
2003年 | 10篇 |
2002年 | 10篇 |
2001年 | 8篇 |
2000年 | 5篇 |
1999年 | 7篇 |
1998年 | 29篇 |
1997年 | 9篇 |
1996年 | 15篇 |
1995年 | 13篇 |
1994年 | 7篇 |
1993年 | 6篇 |
1991年 | 3篇 |
1990年 | 4篇 |
1989年 | 1篇 |
1988年 | 2篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1983年 | 2篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1980年 | 3篇 |
1976年 | 1篇 |
1971年 | 1篇 |
1961年 | 1篇 |
1960年 | 1篇 |
排序方式: 共有394条查询结果,搜索用时 12 毫秒
101.
Identification of small-molecule ligands for a protein of interest can facilitate the analysis of the protein's functions in biological systems. Small-molecule microarrays have allowed for rapid detection of such ligand-protein interactions in a high-throughput manner, although a label on a protein is needed to observe these interactions. By combining SPR imaging technology with our recently developed photo-cross-linked small-molecule array platform, we developed a novel platform that allows in situ observation of interactions between photo-cross-linked small molecules on gold surfaces and nonlabeled proteins in solution. Interactions of estrogenic and androgenic substances with estrogen receptor alpha were observed using this platform. 相似文献
102.
103.
In the search for new fluorescent materials among lanthanoid-activated Ca2 SnO4 compounds, a parallel solution-based synthesis approach was applied and a new blue-emission Ca2 SnO4 :Ce phosphor was discovered; its emission intensity reaches 80% of the intensity of one of the best commercial Y3 Al5 O12 :Ce3+ phosphors. Among 14 lanthanoid-activated materials, three categories could be distinguished with respect to the effect of the dopant ion on the excitation and emission properties of the phosphor. In addition, potential phosphors in the A–Sn–O (A=Mg, Ca, Sr, and Ba) systems were investigated and Ca2 SnO4 was found to be the most suitable host compound for the lanthanoid-activated phosphors. 相似文献
104.
Analysis of molecular dynamics of colloidal particles in transported dilute samples by self-mixing laser Doppler velocimetry 总被引:1,自引:0,他引:1
Colloidal particles in a liquid medium are transported with constant velocity, and dynamic light scattering experiments are performed on the samples by self-mixing laser Doppler velocimetry. The power spectrum of the modulated wave induced by the motion of the colloidal particles cannot be described by the well-known formula for flowing Brownian motion systems, i.e., a combination of Doppler shift, diffusion, and translation. Rather, the power spectrum was found to be described by the q-Gaussian distribution function. The molecular mechanism resulting in this anomalous line shape of the power spectrum is attributed to the anomalous molecular dynamics of colloidal particles in transported dilute samples, which satisfy a nonlinear Langevin equation. 相似文献
105.
106.
Dr. Yushi Futamura Dr. Makoto Kawatani Dr. Makoto Muroi Harumi Aono Dr. Toshihiko Nogawa Prof. Dr. Hiroyuki Osada 《Chembiochem : a European journal of chemical biology》2013,14(18):2456-2463
In the course of screening our microbial metabolite fraction library, we identified a novel pyrrolizidinone compound, pyrrolizilactone. In this study, we report the identification and characterization of a molecular target for pyrrolizilactone by using two phenotypic profiling systems. Cell morphology‐based profiling analysis using an imaging cytometer (MorphoBase) classified pyrrolizilactone as a proteasome inhibitor. Consistently, proteome‐based profiling analysis using 2D difference gel electrophoresis (DIGE; ChemProteoBase) also demonstrated that pyrrolizilactone is associated with proteasome inhibition. On the basis of these predictions, we determined that pyrrolizilactone is a novel type of proteasome inhibitor inhibiting the trypsin‐like activity of the proteasome. 相似文献
107.
K Tamama T Kanda M Osada R Nagai T Suzuki I Kobayashi 《Canadian Metallurgical Quarterly》1998,29(3-4):231-236
Cardiomegaly is one of the commonest findings encountered in daily clinical practice, and its differential diagnosis is a common clinical problem. There are many electrocardiological (ECG) criteria known for left ventricular hypertrophy (LVH), but its limitations have also been suggested. We evaluated 102 patients fulfilling the ECG criteria of precordial and limb lead for LVH with echocardiographic findings as a gold standard. Among these 102 patients, the echocardiogram revealed 38 subjects with LVH, 26 subjects with left ventricular dilatation (LVD), 7 subjects with both findings, and 31 subjects with neither findings. Precordial criteria such as SV1+RV5 or RV6 > 30 mm, SV1 or SV2+RV5 > 35 mm, R+S > 40 mm, SV1 or SV2+RV5 or RV6 > 35 mm, SV2+RV4 or RV5 > 35 mm, high in sensitivity and low in specificity for LVD and LVH, are appropriate for screening LVD and LVH. Cornell limb lead criterion, SV3+RaVL > 28 mm (male), SV3+RaVL > 20 mm (female), high in sensitivity and specificity only for LVH, is the best elecrocardiographic criterion to evaluate LVH. Precordial and limb lead criteria such as R> 13 mm, RaVL > 12 mm, RaVF > 20 mm, onset of intrinsicoid deflection in V5 or V6> 0.05 sec, left axis deviation -30 degrees to -90 degrees, low in sensitivity, and high in specificity, are useful to rule out LVH and/or LVD. Our findings suggest LVD and LVH can be evaluated by ECG, but similar sensitivity and specificity for both LVH and LVD makes separation of LVH from LVD unattainable. 相似文献
108.
109.
Orientation of crystallites in (Bi,La) 4 Ti 3 O 12 (BLT) thin films were successfully controlled by adding such silicates and germanates as Bi 2 SiO 5 , ZrSiO 4 and La 2 GeO 5 . The ferroelectric films were formed by spin-coating mixed sol-gel solutions of BLT and silicate or germanate on a Pt/Ti/SiO 2 /Si structure. It was found from XRD analysis that the preferred orientation of crystallites in the BLT films was changed by the additives. That is, the orientation of crystallites in a Bi 2 SiO 5 -added BLT film was random, while it was almost perfectly c-axis-oriented in La 2 GeO 5 -added BLT and it was strongly (117)-oriented when ZrSiO 4 was added to BLT. It was also found that the remnant polarization and coercive field changed reflecting these different orientations. 相似文献
110.
Finite element analysis of fracture statistics of ceramics: Effects of grain size and pore size distributions 下载免费PDF全文
Shingo Ozaki Yuya Aoki Toshio Osada Kyohei Takeo Wataru Nakao 《Journal of the American Ceramic Society》2018,101(7):3191-3204
A novel numerical simulation method based on finite element analysis (FEA), which can evaluate the fracture probability caused by the characteristics of flaw distribution, is considered an effective tool to facilitate and increase the use of ceramics in components and members. In this study, we propose an FEA methodology to predict the scatter of ceramic strength. Specifically, the data on the microstructure distribution (i.e., relative density, size and aspect ratio of pore, and grain size) are taken as the input values and reflected onto the parameters of a continuum damage model via a fracture mechanical model based on the circumferential circular crack emanating from an oval spherical pore. In addition, we numerically create a Weibull distribution based on multiple FEA results of a three‐point bending test. Its validity is confirmed by a quantitative comparison with the actual test results. The results suggest that the proposed FEA methodology can be applied to the analysis of the fracture probability of ceramics. 相似文献