全文获取类型
收费全文 | 79篇 |
免费 | 5篇 |
国内免费 | 1篇 |
专业分类
化学 | 60篇 |
力学 | 5篇 |
数学 | 14篇 |
物理学 | 6篇 |
出版年
2021年 | 2篇 |
2018年 | 1篇 |
2017年 | 1篇 |
2016年 | 1篇 |
2015年 | 2篇 |
2014年 | 6篇 |
2013年 | 1篇 |
2012年 | 7篇 |
2011年 | 10篇 |
2010年 | 3篇 |
2009年 | 6篇 |
2008年 | 7篇 |
2007年 | 4篇 |
2006年 | 10篇 |
2005年 | 5篇 |
2004年 | 3篇 |
2003年 | 2篇 |
2002年 | 2篇 |
2000年 | 3篇 |
1998年 | 1篇 |
1996年 | 1篇 |
1995年 | 2篇 |
1985年 | 2篇 |
1974年 | 1篇 |
1972年 | 1篇 |
1970年 | 1篇 |
排序方式: 共有85条查询结果,搜索用时 15 毫秒
81.
This study describes a semi-analytic solution of planar radiative shock waves with a grey nonequilibrium diffusion radiation
model. The solution may be used to verify radiation-hydrodynamics codes. Comparisons are made with the equilibrium diffusion
solutions of Lowrie and Rauenzahn (Shock Waves 16(6):445–453, 2007). The solution also gives additional insight into the structure
of radiative shocks. Previous work has assumed that the material temperature reaches its maximum at the post-shock state of
the embedded hydrodynamic shock (Zel’dovich spike). We show that in many cases, the temperature may continue to increase after
the hydrodynamic shock and reaches its maximum at the isothermal sonic point. Also, a temperature spike may exist even in
the absence of an embedded hydrodynamic shock. We also derive an improved estimate for the maximum temperature.
相似文献
82.
Steinbacher JL Moy RW Price KE Cummings MA Roychowdhury C Buffy JJ Olbricht WL Haaf M McQuade DT 《Journal of the American Chemical Society》2006,128(29):9442-9447
The preparation of hierarchically structured organosilicon microcapsules from commercially available starting materials is described. Using a microfluidic device, an emulsion of dichlorodiphenylsilane is formed in a continuous phase of aqueous glycerol. The silane droplets undergo hydrolysis, condensation, and crystallization within minutes to form self-assembled, core-shell microcapsules. The microparticles have been characterized with light and electron microscopy, nuclear magnetic resonance spectroscopy (NMR), diffusion-ordered NMR spectroscopy (DOSY), Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), and powder X-ray diffraction (XRD). The characterization data show that the microcapsule walls consist of amorphous, oligomeric poly(diphenylsiloxane) surrounded by a spiny layer of crystalline diphenylsilanediol. Glycerol is occluded within the wall material but is not covalently bound to the silicon components. Glycerol is a crucial element for producing low-dispersity microcapsules with well-ordered surface spines, as the use of methyl cellulose as viscomodifier yields amorphous surfaces. 相似文献
83.
84.
T. Nguyen-Ba H. Yagoub H. Hao R. Vaillancourt 《Applied mathematics and computation》2011,217(21):8403-8418
The ODE solver HBT(12)5 of order 12 (T. Nguyen-Ba, H. Hao, H. Yagoub, R. Vaillancourt, One-step 5-stage Hermite-Birkho-Taylor ODE solver of order 12, Appl. Math. Comput. 211 (2009) 313-328. doi:10.1016/j.amc.2009.01.043), which combines a Taylor series method of order 9 with a Runge-Kutta method of order 4, is expanded into the DAE solver HBT(12)5DAE of order 12. Dormand-Prince’s DP(8, 7)13M is also expanded into the DAE solver DP(8, 7)DAE. Pryce structural pre-analysis, extended ODEs and ODE first-order forms are adapted to these DAE solvers with a stepsize control based on local error estimators and a modified Pryce algorithm to advance integration. HBT(12)5DAE uses only the first nine derivatives of the unknown variables as opposed to the first 12 derivatives used by the Taylor series method T12DAE of order 12. Numerical results show the advantage of HBT(12)5DAE over T12DAE, DP(8, 7)DAE and other known DAE solvers. 相似文献
85.
Ion trajectories in an electrostatic ion guide for external ion source fourier transform ion cyclotron resonance mass spectrometry 总被引:1,自引:0,他引:1
Jarrod A. Marto Alan G. Marshall Michael A. May Patrick A. Limbach 《Journal of the American Society for Mass Spectrometry》1995,6(10):936-946
An electrostatic ion guide (EIG) that consists of concentric cylinder and central wire electrodes can transport ions efficiently from an external ion source to an ion cyclotron resonance (ICR) ion trap for mass analysis, with several advantages over current injection methods. Because the electrostatic force of the EIG captures ions in a stable orbit about the wire electrode, ions with initially divergent trajectories may be redirected toward the ICR ion trap for improved ion transmission efficiency. SIMION trajectory calculations (ion kinetic energy, 1–200 eV; elevation angle, 0.30 °; azimuthal angle, 0.360°) predict that ions of m/z 1000 may be transmitted through a strong (0.01 → 3.0-T) magnetic field gradient. Judicious choice of ion source position and EIG potential minimizes the spread in ion axial kinetic energy at the ICR ion trap. Advantages of the EIG include large acceptance angle, even for ions that have large initial kinetic energy and large radial displacement with respect to the central z-axis, low ion extraction voltage (5–20 V), and efficient trapping because ions need not be accelerated to high velocity to pass through the magnetic field gradient. 相似文献