全文获取类型
收费全文 | 59篇 |
免费 | 1篇 |
专业分类
化学 | 13篇 |
力学 | 6篇 |
数学 | 2篇 |
物理学 | 39篇 |
出版年
2016年 | 1篇 |
2014年 | 1篇 |
2013年 | 2篇 |
2012年 | 1篇 |
2011年 | 3篇 |
2010年 | 1篇 |
2009年 | 1篇 |
2008年 | 1篇 |
2007年 | 1篇 |
2006年 | 1篇 |
2005年 | 2篇 |
2004年 | 2篇 |
2003年 | 1篇 |
2002年 | 1篇 |
2001年 | 1篇 |
2000年 | 2篇 |
1999年 | 3篇 |
1998年 | 1篇 |
1996年 | 1篇 |
1995年 | 3篇 |
1994年 | 7篇 |
1993年 | 1篇 |
1992年 | 6篇 |
1991年 | 3篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1980年 | 2篇 |
1973年 | 2篇 |
1968年 | 1篇 |
1967年 | 1篇 |
1966年 | 1篇 |
排序方式: 共有60条查询结果,搜索用时 15 毫秒
41.
Bellotti R Cafagna F Circella M De Cataldo G De Marzo CN Giglietto N Spinelli P Golden RL Stephens SA Stochaj SJ Webber WR De Pascale MP Morselli A Picozza P Ormes JF Streitmatter RE Massimo Brancaccio F Papini P Piccardi P Spillantini P Basini G Bongiorno F Ricci M Brunetti MT Codino A Grimani C Menichelli M Salvatori I 《Physical review D: Particles and fields》1996,53(1):35-43
42.
43.
44.
Experimental investigation of ram accelerator propulsion modes 总被引:1,自引:0,他引:1
Experimental investigations on the propulsive modes of the ram accelerator are reviewed in this paper. The ram accelerator is a ramjet-in-tube projectile accelerator whose principle of operation is similar to that of a supersonic air-breathing ramjet. The projectile resembles the centerbody of a ramjet and travels through a stationary tube filled with a premixed gaseous fuel and oxidizer mixture. The combustion process travels with the projectile, generating a pressure distribution which produces forward thrust on the projectile. Several modes of ram accelerator operation are possible which are distinguished by their operating velocity range and the manner in which the combustion process is initiated and stabilized. Propulsive cycles utilizing subsonic, thermally choked combustion theoretically allow projectiles to be accelerated to the Chapman-Jouguet(C-J) detonation speed of a gaseous propellant mixture. In the superdetonative velocity range, the projectile is accelerated while always traveling faster than the C-J speed, and in the transdetonative regime (85–115 % of C-J speed) the projectile makes a smooth transition from a subdetonative to a superdetonative propulsive mode. This paper examines operation in these three regimes of flow using methane and ethylene based propellant mixtures in a 16 m long, 38 mm bore ram accelerator using 45–90 g projectiles at velocities up to 2500 m/s.This article was processed using Springer-Verlag TEX Shock Waves macro package 1990. 相似文献
45.
The excitation of low frequency modes of oscillations in a magnetized bi-ion or dusty plasma with parametric pumping of the
magnetic field is analysed. The equation of motion governing the perturbed plasma is derived and parametrically excited transverse
modes propagating along the magnetic field are found. With multiple ion species or charged dust present, a number of different
circularly polarized modes can be excited. The stability of these modes is investigated as a function of the plasma parameters.
The modulational instabilities of large amplitude normal modes, modified by the extra ion species or dust and propagating
along the magnetic field, are also investigated
Article presented at the International Conference on the Frontiers of Plasma Physics and Technology, 9–14 December 2002, Bangalore,
India. 相似文献
46.
47.
48.
49.
Stephen J. Hannon Nitya G. Kundu Robert P. Hertzberg Ram S. Bhatt Charles Heidelberger 《Tetrahedron letters》1980,21(12):1105-1108
1,3-Di-N-substituted uracil and its derivatives have been reduced with lithium-tri--butyl borohydride to the corresponding 5,6-dihydro compounds in excellent yields. Alkylation of 5-position of uracil is also very conveniently accomplished. 相似文献
50.