全文获取类型
收费全文 | 533篇 |
免费 | 11篇 |
国内免费 | 2篇 |
专业分类
化学 | 299篇 |
晶体学 | 30篇 |
力学 | 22篇 |
数学 | 60篇 |
物理学 | 135篇 |
出版年
2023年 | 6篇 |
2022年 | 11篇 |
2021年 | 14篇 |
2020年 | 7篇 |
2019年 | 9篇 |
2018年 | 19篇 |
2017年 | 12篇 |
2016年 | 19篇 |
2015年 | 5篇 |
2014年 | 16篇 |
2013年 | 33篇 |
2012年 | 34篇 |
2011年 | 29篇 |
2010年 | 18篇 |
2009年 | 21篇 |
2008年 | 19篇 |
2007年 | 26篇 |
2006年 | 21篇 |
2005年 | 21篇 |
2004年 | 20篇 |
2003年 | 12篇 |
2002年 | 5篇 |
2001年 | 10篇 |
2000年 | 8篇 |
1999年 | 4篇 |
1997年 | 4篇 |
1996年 | 3篇 |
1995年 | 5篇 |
1994年 | 4篇 |
1993年 | 10篇 |
1992年 | 10篇 |
1991年 | 5篇 |
1990年 | 5篇 |
1989年 | 8篇 |
1988年 | 3篇 |
1987年 | 3篇 |
1986年 | 8篇 |
1985年 | 9篇 |
1984年 | 7篇 |
1982年 | 6篇 |
1981年 | 4篇 |
1979年 | 4篇 |
1978年 | 8篇 |
1976年 | 7篇 |
1975年 | 5篇 |
1974年 | 4篇 |
1973年 | 3篇 |
1970年 | 3篇 |
1969年 | 7篇 |
1968年 | 3篇 |
排序方式: 共有546条查询结果,搜索用时 15 毫秒
31.
V.A. Kheraj C.J. Panchal P.K. Patel B.M. Arora T.K. Sharma 《Optics & Laser Technology》2007,39(7):1395-1399
The optical output power of a laser diode can be enhanced by anti-reflection (AR) and high-reflection (HR) facet coatings, respectively, at the front and back facet. AR and HR coatings also serve the purpose of protection and passivation of laser diode facets. In this work, we have designed and optimized a single layer λ/4 thick Al2O3 film for the AR coating and a stack of λ/4 thick Al2O3/λ/4 thick Si bi-layers for the HR coating for highly strained InGaAs quantum-well edge emitting broad area (BA) laser diodes. Effect of the front and back facet reflectivities on output power of the laser diodes has been studied. The light output versus injected current (L–I characteristics) measurements were carried out on selected devices before and after the facet coatings. We have also carried out the numerical simulation and analysis of L–I characteristics for this particular diode structure. The experimental results have been compared and verified with the numerical simulation. 相似文献
32.
Dibromoacetyl benzene derivatives on condensation with thiourea give 2-amino-4-arylthiazoles instead of the expected 2-amino-4-aryl-5-bromothiazoles. Attempts have been made to find the reaction pathway. 相似文献
33.
34.
35.
The rate constants of O2(1Δg) with aliphatic alcohols, terpenes, unsaturated hydrocarbons, chlorinated hydrocarbons, oxygen, and diamines have been studied in thepresence of NO2. The rate constants for oxygen, 1,2-ethane diamine, and 1,2-propane diamine are (9.9 ± 0.4) × 102, (8.7 ± 0.7) × 104, and (1.4 ± 0.3) × 104 1/mol/s, respectively. The rate constants for all other compounds are less than the oxygen rate constant. 相似文献
36.
S. L. Arora P. Palffy-Muhoray R. A. Vora D. J. David A. M. Dasgupta 《Liquid crystals》1989,5(1):133-140
A number of 4'-substituted phenyl 4-(4'-cyano-4-oxybiphenyl)butanoates have been synthesized to study the effects of the -O-(CH2)3COO- inter-ring linkage on mesomorphic behaviour. Transition temperatures have been determined and are compared with those of the phenyl cyanobiphenylmethanoate analogues. In general, the butanoates exhibit lower melting points but in all cases, a lower nematic-isotropic transition is observed. An interesting feature of some members of the butanoate series is the presence of several reentrant mesophases. A unique phenomenon observed while studying the behaviour of one of the butanoates was the appearance of smectic filaments from the isotropic liquid on cooling. These filaments, through an unusual process, eventually form the typical smectic A texture. Formation of an SA phase from the isotropic liquid or the nematic phase in this fashion has not been reported previously. 相似文献
37.
Sanjiv Arora Rajeev Bagoria Mahender Kumar 《Journal of Thermal Analysis and Calorimetry》2010,102(1):375-381
Alpha-tocopherol (vitamin E) is the most widely used antioxidant for edible oils. The present investigation presents its effect
on the thermal degradation behavior of edible oils (sunflower, soybean, and their blend) through the use of dynamic thermogravimetry.
The study is based on the comparison of activation energies of decomposition process which were subsequently calculated using
preferred and reliable multiple-heating rate methods viz. Kissinger, Friedman, Ozawa–Flynn–Wall, and Coats–Redfern (modified).
It is concluded that the role of alpha-tocopherol as antioxidant at higher temperature is nearly accomplished. 相似文献
38.
An experimental investigation is made to study the flow characteristics of slot jet impingement on a cylinder. The velocity profiles and pressure distribution around the cylinder are reported for various parameters namely, the flow rate, width of the nozzle, distance of the cylinder from the jet exit and eccentricity of the cylinder to the jet axis.
Nomenclature B breadth of the nozzle at the exit - D diameter of the cylinder - C p pressure coefficient - g acceleration due to gravity - L distance of the cylinder from jet exit - P a atmospheric pressure - P c static pressure along the jet center-line - P 0 stagnation pressure - P W wall static pressure - Re D Reynolds numberu j D/ a - Re W Reynolds numberu j W/ a - r distance measured from cylinder surface in radial direction - r m position of maximum velocity from cylinder surface - r 0.5 half width of the jet - u mean velocity - u j mean velocity at the jet exit - u m maximum velocity - W width of the nozzle - a density of air - m density of mercury - w density of water - absolute viscosity - kinematic viscosity 相似文献
Experimentelle Untersuchung über die Strömungseigenschaften eines Düsenstrahls, der auf einen Zylinder aufprallt
Zusammenfassung Es wurde eine experimentelle Untersuchung gemacht, um die Strömungseigenschaften eines Düsenstrahls zu unterschen, der auf einen Zylinder prallt. Die Geschwindigkeitsprofile und die Druckverteilungen an dem Zylinder wurden für unterschiedliche Parameter dokumentiert. Die Parameter sind die Strömungsgeschwindigkeit, Düsengröße, Abstand zwischen Zylinder und Strahlaustritt und die Exzentrizität von Zylinder und Strahlachse.
Nomenclature B breadth of the nozzle at the exit - D diameter of the cylinder - C p pressure coefficient - g acceleration due to gravity - L distance of the cylinder from jet exit - P a atmospheric pressure - P c static pressure along the jet center-line - P 0 stagnation pressure - P W wall static pressure - Re D Reynolds numberu j D/ a - Re W Reynolds numberu j W/ a - r distance measured from cylinder surface in radial direction - r m position of maximum velocity from cylinder surface - r 0.5 half width of the jet - u mean velocity - u j mean velocity at the jet exit - u m maximum velocity - W width of the nozzle - a density of air - m density of mercury - w density of water - absolute viscosity - kinematic viscosity 相似文献
39.
Multifunctionalized tetrahydropyrimidines derivatives have been synthesized from Biginelli 3,4-dihydropyrimidin-2-(1H)-thiones (DHPMs) efficiently. The transformation includes desulfurization of DHPMs with Raney-Ni and subsequent regioselective C-2 functionalization using a variety of C-nucleophiles with simultaneous activation with ethyl chloroformate. Functionalized pyrimidine derivatives containing bulky substituents at C-2 of the pyrimidine ring are cytostatic. 相似文献
40.