全文获取类型
收费全文 | 116篇 |
免费 | 2篇 |
国内免费 | 1篇 |
专业分类
化学 | 63篇 |
晶体学 | 5篇 |
力学 | 5篇 |
数学 | 16篇 |
物理学 | 30篇 |
出版年
2021年 | 2篇 |
2020年 | 1篇 |
2019年 | 1篇 |
2016年 | 1篇 |
2015年 | 3篇 |
2014年 | 6篇 |
2013年 | 7篇 |
2012年 | 7篇 |
2011年 | 13篇 |
2010年 | 5篇 |
2009年 | 3篇 |
2008年 | 10篇 |
2007年 | 6篇 |
2006年 | 4篇 |
2005年 | 7篇 |
2004年 | 8篇 |
2003年 | 2篇 |
2002年 | 3篇 |
2001年 | 2篇 |
2000年 | 3篇 |
1999年 | 2篇 |
1996年 | 2篇 |
1995年 | 2篇 |
1993年 | 3篇 |
1992年 | 1篇 |
1990年 | 3篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 3篇 |
1982年 | 1篇 |
1980年 | 1篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1973年 | 1篇 |
排序方式: 共有119条查询结果,搜索用时 15 毫秒
101.
Jian-Shian Lin Ming-Hua Chung Chen-Ming Chen Fuh-Shyang Juang Mark O. Liu 《Journal of Non》2009,355(43-44):2143-2147
Ultraviolet (UV) curable organic/inorganic hybrid nanocomposites with excellent gas barrier effect, good adhesion strength, high refractive indices, moderate hardness, and fast curing speed have been successfully quickly synthesized by UV irradiation and utilized for the encapsulation of light emitting diodes (LEDs). In addition, the experimental results reveal that lab-made nanocomposites effectively resist the penetration of oxygen and moisture in the air into the LEDs and thus enhance their lifetimes to achieve 18,300 h while those without encapsulation are only 2400 h. 相似文献
102.
103.
Based on the concept of matrix measures, we study global stability of synchronization in networks. Our results apply to quite general connectivity topology. In addition, a rigorous lower bound on the coupling strength for global synchronization of all oscillators is also obtained. Moreover, by merely checking the structure of the vector field of the single oscillator, we shall be able to determine if the system is globally synchronized. 相似文献
104.
Jian‐Shian Lin Ming‐Hua Chung Chen‐Ming Chen Fuh‐Shyang Juang Lung‐Chang Liu 《Journal of Physical Organic Chemistry》2011,24(3):193-202
UV curable organic/inorganic hybrid nanocomposites with high refractive indices, moderate hardness, good adhesive strength, and excellent gas blocking performances have been successfully rapidly synthesized by in situ microwave‐assisted heating process. We find that the chemical structures of polymer matrices influence the physical properties and addition of silicone and polyurethane (PU) into the acrylics backbone can further reduce the gas permeation and increase the adhesive strength as well as refractive indices. Moreover, lab‐made Silicone/PU/Acrylics I nanocomposites have also been utilized for the encapsulation of organic solar cells, LEDs, OLEDs, and flexible OLEDs. The experimental results demonstrate that they can effectively hinder the penetration of oxygen as well as moisture in the atmosphere into the photoelectric devices, consequently prolonging their lifetimes. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
105.
Ching Hsuan Lin Chen Ming Li Chin Kuang Hsu Hou Chien Chang Tzong Yuan Juang 《Journal of polymer science. Part A, Polymer chemistry》2013,51(12):2709-2715
High‐performance and flexible poly(pyrrolone imide)s (PPyIs) were firstly prepared by the reaction of dianhydrides with an unsymmetric phosphinated triamine, 1‐(3,4‐diaminophenyl)‐1‐(4‐aminophenyl)‐1‐(6‐oxido‐6H ‐dibenz <c,e> <1,2> oxaphosphorin‐6‐yl)ethane (1), which was prepared by a facile, one‐pot procedure from the reaction DOPO, 4‐aminoacetophenone in excess o‐phenylenediamine in the presence of p‐toluenesulfonic acid. Thermal properties of the resulting PPyIs were evaluated and compared with those of phosphinated polyimides with a similar structure. All of the prepared PPyIs films are tough and creasable. They display higher Tg (374–412 °C), lower coefficient of thermal expansion (34–46 ppm/°C), and better thermal stability (Td 5 wt %: 456–477 °C, 800 °C char yield: 59–63%) than analogous phosphinated polyimides. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013, 51, 2709–2715 相似文献
106.
We report an intuitive approach to simulating the performance of the phosphor-based light emitting diode (LED) by using the
two-light-sources model for an optimized LED lens. The optimized secondary lens shape is achieved by approaching a uniform
energy distribution on the detecting plane. Both the spectrum and spatial apodization of the LED structure are discussed,
and the results indicate that the two-light-sources model can solve the misleading design on the phosphor-based LED due to
imperfect color mixing of light source, that one can satisfy the highly uniformity requirement for specific applications,
such as display backlight or optogenetic. 相似文献
107.
Shiu-Jen Liu Shih-Hao SuHau-Wei Fang Jang-Hsing HsiehJenh-Yih Juang 《Applied Surface Science》2011,257(23):10018-10021
Amorphous thin films of InGaZnO4 (a-IGZO) doped with Cr have been fabricated by using pulsed-laser deposition (PLD). The electrical, optical and magnetic properties of Cr-doped a-IGZO films grown at 25 °C and 150 °C were investigated. The conductivity, optical transmission and band gap of films are remarkably enhanced by increasing the growth temperature. Conductivity, carrier concentration and mobility decrease with increasing the Cr content. However, the optical transmission and band gap are not significantly affected by Cr doping. Moreover, all Cr-doped films exhibit room-temperature ferromagnetism. 相似文献
108.
109.
110.
J. N. Juang J. D. Turner H. M. Chun 《Journal of Optimization Theory and Applications》1986,51(2):307-320
Feedback control laws are derived for a class of optimal finite time tracking problems with terminal constraints. Analytical solutions are obtained for the feedback gain and the closed-loop response trajectory. Such formulations are expressed in recursive forms so that a real-time computer implementation becomes feasible. An example involving the feedback slewing of a flexible spacecraft is given to illustrate the validity and usefulness of the formulations. 相似文献