全文获取类型
收费全文 | 3491篇 |
免费 | 357篇 |
国内免费 | 159篇 |
专业分类
化学 | 942篇 |
晶体学 | 21篇 |
力学 | 268篇 |
综合类 | 79篇 |
数学 | 332篇 |
物理学 | 2365篇 |
出版年
2024年 | 6篇 |
2023年 | 22篇 |
2022年 | 57篇 |
2021年 | 90篇 |
2020年 | 99篇 |
2019年 | 67篇 |
2018年 | 53篇 |
2017年 | 123篇 |
2016年 | 151篇 |
2015年 | 137篇 |
2014年 | 207篇 |
2013年 | 257篇 |
2012年 | 149篇 |
2011年 | 165篇 |
2010年 | 160篇 |
2009年 | 199篇 |
2008年 | 204篇 |
2007年 | 215篇 |
2006年 | 167篇 |
2005年 | 160篇 |
2004年 | 140篇 |
2003年 | 164篇 |
2002年 | 131篇 |
2001年 | 88篇 |
2000年 | 113篇 |
1999年 | 88篇 |
1998年 | 90篇 |
1997年 | 77篇 |
1996年 | 59篇 |
1995年 | 73篇 |
1994年 | 55篇 |
1993年 | 50篇 |
1992年 | 38篇 |
1991年 | 17篇 |
1990年 | 26篇 |
1989年 | 17篇 |
1988年 | 24篇 |
1987年 | 16篇 |
1986年 | 14篇 |
1985年 | 10篇 |
1984年 | 9篇 |
1983年 | 2篇 |
1982年 | 5篇 |
1980年 | 4篇 |
1979年 | 2篇 |
1976年 | 2篇 |
1975年 | 1篇 |
1970年 | 1篇 |
1969年 | 1篇 |
1966年 | 1篇 |
排序方式: 共有4007条查询结果,搜索用时 15 毫秒
71.
Masahiro Toyoda Yukio Hamaji Kunisaburo Tomono 《Journal of Sol-Gel Science and Technology》1997,9(1):71-84
The sol-gel processing was applied to the fabrication of PbTiO3 fibers. Pb(CH3COO)2·3H2O and Ti(OC3H
7
i
)4 were refluxed with stirring in 2-methoxyethanol to form Pb-methoxyethoxide and Ti-methoxyethoxide, respectively, followed
by mixing with stirring in 2-methoxyethanol to form Pb−Ti double alkoxide. The hydrolysis and polycondensation reaction of
this double alkoxide gave polymerized products, and as a result the viscosity of the solution increased, suggesting that linear
polymers were produced through the hydrolysis and polycondensation reaction. Homogeneous PbTiO3 gel fibers were drawn from the spinnable viscous solutions, which were wellcrystallized into perovskite type PbTiO3 at 650°C. The heat-treated fibers were a few centimeters long and from 10 to 100 μm in diameter. The fiber was made up of
extremely uniform grains. Electron diffraction revealed a preferred growth of (101) planes along the fiber axis, which might
be due to the linear molecular characteristics of the alkoxide. 相似文献
72.
73.
提出了一种铁矿粉热加工生产工艺中亚铁含量测定的新方法。在氮气保护下,用盐酸溶出样中的亚铁,在硫磷混酸介质中以重铬酸钾标准溶液滴定,并对溶样条件进行了研究。该方法简单、快速、准确,已成功地应用于氧化催化法生产氧化铁中亚铁的控制分析和成品鉴定。 相似文献
74.
Tsutomu Takeichi Nobuyuki Takahashi Rikio Yokota 《Journal of polymer science. Part A, Polymer chemistry》1994,32(1):167-174
Polyimide/polyimide molecular composite (MC) films comprised of a rigid polyimide derived from biphenyltetracarboxylic dianhydride (BPDA) and p-phenylenediamine (PDA) and a flexible polyimide derived from BPDA and bis (3,3'-diaminodiphenyl) acetylene (intA) and/or oxydianiline (ODA) were prepared by blending the polyamic acid solutions in 7 : 3 weight ratio, and then imidizing the blend films. Acetylene content in the flexible polyimide backbone was controlled by the ratio of intA and ODA. Cold-drawing of the blend polyamic acid films, followed by imidization, gives high modulus polyimide/polyimide MC films. The modulus of the MC films increased almost linearly with the draw ratio, reaching 25.5 GPa for the 40% drawn film. Acetylene groups in the flexible polyimide can be thermally cured to crosslink. The onset of exotherm appeared at 340°C on DSC, reaching maximum at 398°C. After the thermal crosslinking, the MC films maintained the high modulus, though elongation became small. Taking advantage of the crosslinkable acetylene units, two MC films were laminated and processed at 400°C for 20 min under 100 kg/cm2 to give a good-quality laminate film. The interface of the two films was strongly bonded through the crosslinking of acetylene groups. Laminate films maintained the high modulus afforded by the cold-drawing. © 1994 John Wiley & Sons, Inc. 相似文献
75.
研究了高效液相色谱-火焰原子吸收光谱联用系统分析信号处理方法,比较了各种处理方法的优缺点,用积分与适应平滑法综合处理色谱峰分析信号,不仅能有效地消除噪声,而且能使分析信号得到加强,以测定镍为例,经积分与适应平滑法综合处理后,检出限改善了2.7倍。 相似文献
76.
Sandip?HalderEmail author Theodor?Schneller Rainer?Waser 《Journal of Sol-Gel Science and Technology》2005,33(3):299-306
A new chemical solution deposition (CSD) route for the fabrication of Ba0.7Sr0.3TiO3 (BST) thin films has been developed which completely prevents the formation of an intermediate oxo-carbonate phase. The latter has been reported previously by several authors to be responsible for increased crystallization temperatures. Barium and strontium diaminoethoxides were synthesized starting from pure barium and strontium metal and aminoethanol. These alkoxides were found to be readily soluble in a wide range of solvents and thus were excellent candidates for the CSD process. To prepare a stable precursor solution the aminoalkoxides were dissolved in 2-butoxyethanol and then used for the deposition of BST thin films. We conclude that the minimum crystallization temperature of 600C to be independent of the formation of the oxo-carbonate phase. DTA-TGA were performed on the precursors and their solutions to study their decomposition behaviour. All films annealed at different temperatures were physically characterized by XRD, IR, and SEM. The films prepared by this route at 650C were found to have high dielectric constant and the leakage currents were comparable to BST films prepared by normal carboxylate based routes at 750C. 相似文献
77.
As a consequence
of their excellent barrier properties vinyl chloride/vinylidene chloride copolymers
have long been prominent in the flexible packaging market. While these polymers
possess a number of superior characteristics, they tend to undergo thermally-
induced degradative dehydrochlorination at process temperatures. This degradation
must be controlled to permit processing of the polymers. Three series of N-substituted
maleimides (N-alkyl-, N-aralkyl, and N-aryl) have been synthesized, characterized
spectroscopically, and evaluated as potential stabilizers for a standard vinyl
chloride/vinylidene chloride (85 mass%) copolymer. As surface blends with
the polymer, these compounds are ineffective as stabilizers. However, significant
stabilization may be achieved by pretreatment of the polymer with N-substituted
maleimides. The most effective stabilization of the polymer is afforded by
N-aralkyl- or N-arylmaleimides, most notably, N-benzylmaleimide and N-p-methoxyphenylmaleimide. 相似文献
78.
Kenneth W. Mihavics Aris M. Ouksel 《Computational & Mathematical Organization Theory》1996,1(2):143-155
The relationship between organizational learning and organizational design is explored. In particular, we examine the information processing aspects of organizational learning as they apply to a two-valued decision making task and the relation of such aspects to organizational structure. Our primary contribution is to extend Carley's (1992) model of this process. The original model assumes that all data input into the decision making processes are of equal importance or weight in determining the correct overall organizational decision. The extension described here allows for the more natural situation of non-uniform weights of evidence. Further extensions to the model are also discussed. Such organizational learning performance measures provide an interesting framework for analyzing the recent trend towards flatter organizational structures. This research suggests that flatter structures are not always better, but rather that data environment, ultimate performance goals, and relative need for speed in learning can be used to form a contingency model for choosing organizational structure. 相似文献
79.
The preparation of pure Y3Al5O12 (YAG) and 50 vol% Al2O3–YAG
composite powders by a wet chemical route is presented. The role of the synthesis
temperature during reverse-strike precipitation has been investigated, showing
its relevant effect on the purity and homogeneity of YAG powder.
The
composite material was prepared by comparing two different synthesis routes.
A composite powder was synthesized via reverse-strike temperature-controlled
co-precipitation. In the latter case, a pure-alumina precursor was firstly
reverse-strike precipitated and then doped with an yttrium salt solution.
For both syntheses, the role of thermal and mechanical pre-treatments on the
phase development was demonstrated. 相似文献
80.
H. Kienitz 《Angewandte Chemie (International ed. in English)》1969,8(10):733-750
The important advances being made in modern analytical methods are indicative of the fundamental changes that are occuring in the theory and practice of “analytical chemistry”. “Information optimization” demands a new approach in teaching and research, and calls for the intergration of chemistry with other scientific and technical disciplines. 相似文献