全文获取类型
收费全文 | 43篇 |
免费 | 12篇 |
国内免费 | 11篇 |
专业分类
化学 | 29篇 |
晶体学 | 1篇 |
数学 | 3篇 |
物理学 | 33篇 |
出版年
2022年 | 1篇 |
2021年 | 1篇 |
2018年 | 2篇 |
2017年 | 3篇 |
2016年 | 1篇 |
2015年 | 4篇 |
2014年 | 6篇 |
2013年 | 7篇 |
2012年 | 1篇 |
2011年 | 6篇 |
2010年 | 3篇 |
2009年 | 5篇 |
2008年 | 7篇 |
2007年 | 2篇 |
2005年 | 1篇 |
2004年 | 2篇 |
2003年 | 2篇 |
2002年 | 1篇 |
2000年 | 2篇 |
1999年 | 1篇 |
1996年 | 1篇 |
1995年 | 1篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1986年 | 2篇 |
1978年 | 1篇 |
1976年 | 1篇 |
排序方式: 共有66条查询结果,搜索用时 15 毫秒
11.
金的化学状态对Au/CoCeOx催化剂CO氧化性能的影响 总被引:1,自引:1,他引:0
以CoCeOx复合氧化物为载体,采用沉积沉淀法制备了负载型的金催化剂,并通过不同温度的预处理控制Au的化学状态. 使用粉末X射线衍射、高分辨透射电子显微镜、程序升温还原和X射线光电子能谱对催化剂进行了表征,考察了在室温条件下该系列催化剂的一氧化碳氧化性能. 结果表明, Au/CoCeOx催化剂的CO氧化性能与催化剂表面Au 的含量成正比, Au 可能是反应的主要活性物种. 添加水汽对反应有一定的促进作用,但由于Au 不能稳定存在,特别是当催化剂表面Au 的含量过高时,在水汽的作用下Au 迅速发生歧化反应,使得催化剂的性能下降. 相似文献
12.
Alex S. Ionkin William J. Marshall Douglas J. Adelman Barbara Bobik Fones Brian M. Fish Matthew F. Schiffhauer Paul D. Soper Robert L. Waterland Rupert E. Spence Tuyu Xie 《Journal of polymer science. Part A, Polymer chemistry》2008,46(2):585-611
Series of Fe(II) and Fe(III) tridentate bis(imino)pyridine complexes without nitrilo groups 2–6 and with nitrilo groups 7–13 were synthesized. According to X‐ray analysis, the introduction of nitrilo groups in para‐ and ortho‐positions tends to result in shorter axial Fe? N bonds. Both types of complexes, 2–6 and 9–13 , afforded very productive catalysts for the production of α‐olefins with higher K values and better linearity of Schultz–Flory distribution α‐olefins than the parent methyl substituted Fe(II) complex 1 . Noticeably, the complexes functionalized with a para‐nitrilo group 9–13 tend to make α‐olefins with higher K values of the Schultz–Flory distribution, more ideal distributions, and less of the heavier insoluble fractions of α‐olefins than corresponding nonsymmetrically substituted complexes without para‐nitrilo groups 2–6 . Statistically significant correlations were obtained between % solids of total α‐olefins and the blocked solid angle fraction in the +z hemisphere ( = 51.3%, p = 0.012) and between catalyst productivity and total blocked solid angle fraction ( = 43.5%, p = 0.023). The modest values of show that, while steric effects are significant, they are not the sole factor determining catalyst performance. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 585–611, 2008 相似文献
13.
给出了示波器观测铁磁材料物质磁滞回线的基本原理,针对实验中常见的错误,介绍了如何选取合理的数据并快速描绘磁滞回线的技巧。 相似文献
14.
In this study, ultrasonic backscattering signals in cancellous bones were obtained by finite difference time domain (FDTD) simulations, and the effect of trabecular material properties on these signals was analyzed. The backscatter coefficient (BSC) and integrated backscatter coefficient (IBC) were numerically investigated for varying trabecular bone material properties, including density, Lame coefficients, viscosities, and resistance coefficients. The results show that the BSC is a complex function of trabecular bone density, and the IBC increases as density increases. The BSC and IBC increase with the first and second Lame coefficients. While not very sensitive to the second viscosity of the trabeculae, the BSC and IBC decrease as the first viscosity and resistance coefficients increase. The results demonstrate that, in addition to bone mineral density (BMD) and microarchitecture, trabecular material properties significantly influence ultrasonic backseattering signals in cancellous bones. This research furthers the understanding of ultrasonic backscattering in cancellous bones and the characterization of cancellous bone status. 相似文献
15.
In this study, a coupled-channel (CC) analysis of the elastic and the inelastic scattering of 20.4 MeV polarized protons from
a 64Zn target leading to the deformed 2 + , 3 −, 22+2_2^+ states was performed. The CC potential parameters and the deformation parameters of the excited states corresponding to the
best fit to the experimental differential cross-sections and the analysing powers data were determined. For 22+2_2^+ excited state, a mixed type was used and a good fit to the data was provided. The CC calculation results were compared to
the pure distorted wave Born approximation (DWBA) calculation results which were calculated using the new parameters. All
calculations were conducted using the computer code ECIS06. 相似文献
16.
Substitution of protons on external acid sites of the bifunctional catalyst PdHZSM-5 by tetrabutylammonium cations is accompanied by a substantial increase in n-hexane hydroconversion at T = 498 to 548 K. Based on analysis of the distribution of the catalytic reaction products, we suggest an explanation for this effect. 相似文献
17.
18.
Recently, the notion of an S-metric space is defined and extensively studied as a generalization of a metric space. In this paper, we define the notion of the S∞-space and prove its completeness. We obtain a new generalization of the classical "Picard Theorem". 相似文献
19.
20.
时频方法分析长骨中的超声导波及皮质骨厚度 总被引:4,自引:0,他引:4
超声导波在长骨中传播时,接收信号中含有相互叠加的多个导波模式。本文提出将希尔伯特-黄变换(HHT)用于分析叠加的多模式导波信号,将其分解成许多单个独立的模式,然后对分解出的模式求得其对应频率下的群速度,并与短时傅里叶变换所得的结果进行比较。通过与理论计算结果比较,可得到长骨皮质骨的厚度。研究结果表明,实验得到的厚度与实际厚度一致。说明通过测量导波模式的速度可以评价皮质骨的厚度,也说明HHT方法是一种识别叠加多模式导波信号的有效方法。 相似文献