全文获取类型
收费全文 | 126篇 |
免费 | 0篇 |
国内免费 | 1篇 |
专业分类
化学 | 3篇 |
力学 | 2篇 |
数学 | 22篇 |
物理学 | 100篇 |
出版年
2022年 | 1篇 |
2021年 | 3篇 |
2020年 | 1篇 |
2019年 | 4篇 |
2018年 | 6篇 |
2017年 | 6篇 |
2016年 | 6篇 |
2014年 | 1篇 |
2013年 | 9篇 |
2012年 | 3篇 |
2010年 | 2篇 |
2009年 | 8篇 |
2008年 | 6篇 |
2007年 | 3篇 |
2006年 | 9篇 |
2005年 | 9篇 |
2004年 | 6篇 |
2003年 | 5篇 |
2001年 | 3篇 |
2000年 | 7篇 |
1999年 | 3篇 |
1998年 | 1篇 |
1997年 | 9篇 |
1996年 | 2篇 |
1995年 | 1篇 |
1994年 | 3篇 |
1993年 | 1篇 |
1992年 | 2篇 |
1991年 | 2篇 |
1990年 | 2篇 |
1986年 | 1篇 |
1982年 | 1篇 |
1981年 | 1篇 |
排序方式: 共有127条查询结果,搜索用时 15 毫秒
1.
A. L. Goldenberg V. N. Manuilov M. Yu. Glyavin 《Radiophysics and Quantum Electronics》2005,48(6):461-465
We describe a nonadiabatic electron gun operated in the mode of a currentconfined by spatial charge and intended for producing
helical electron beams for high-power gyroresonantdevices.Results of numerical simulation of electron trajectories and electron-beam
parameters arepresented. It is shown that for a high operating current, the pitch factor and the electronvelocity spread can
be significantly better than in the conventional adiabatic systems.
__________
Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 48,No. 6, pp. 517–522, June 2005 相似文献
2.
V. L. Bratman Yu. K. Kalynov V. N. Manuilov S. V. Samsonov 《Radiophysics and Quantum Electronics》2005,48(10-11):731-736
We develop a thermionic-emission electron-optical system forming a dense beam of electrons moving along helical trajectories round the axis of a gyrotron cavity. The maximum beam current is 4 A and the pitch-factor of electrons is 1.0 for a particle energy of 250 keV and a pulse duration of 10 µs. Using such a beam in a gyrotron operated at the third cyclotron harmonic, we obtain single-mode oscillation with a power of 10 µs in the TE3,8 and TE3,9 modes with frequencies 371 and 414 GHz, respectively. 相似文献
3.
V. A. Flyagin V. I. Khizhnyak V. N. Manuilov M. A. Moiseev A. B. Pavelyev V. E. Zapevalov N. A. Zavolsky 《International Journal of Infrared and Millimeter Waves》2003,24(1):1-17
Main results of experimental testing of the 140 GHz/1.5 MW coaxial gyrotron are summarized. High selective properties of the coaxial cavities and a possibility to increase considerably the efficiency of a coaxial gyrotron only by applying independently an appropriate voltage on its electrodes (without any design modification) have been confirmed. Successful uses of the two-potential connection scheme for the frequency step tuning and output power modulation in a coaxial gyrotron has been also demonstrated. 相似文献
4.
V. N. Manuilov T. Idehara M. Kamada T. Hayashi La Agusu T. Kanemaki K. Yatsui Wiehua Jiang 《International Journal of Infrared and Millimeter Waves》2006,27(9):1183-1193
High power Large Orbit Gyrotron (LOG) [1] is now under development at FIR FU. First version of this device was recently manufactured
and then assembled with power supply ETIGO-IV [2]. Results of preliminary tests of electron-optic system are presented. The
conditions when stableflat form of current pulse realized are discussed. Analytical estimations of cathode-anode distance
to achieve small influence of cathode plasma during high voltage (HV) pulse are performed.
Two new electron gun versions with decreased influence of the cathode plasma on its impedance and pulse form are suggested
and optimized. New optimal magnetic field distributions are found. First gun has quiasi-flat cathode configuration near the
anode diaphragm and provides operating current about 60 A. Second one uses blade cathode with operating current about 30 A.
Beam quality for both guns is suitable for LOG operation. 相似文献
5.
6.
7.
8.
La Agusu T. Idehara M. Kamada T. Hayashi V. N. Manuilov O. Dumbrajs K. Yatsui W. Jiang 《International Journal of Infrared and Millimeter Waves》2005,26(5):637-655
Designs of cavities for fundamental and high harmonic operation in Large Orbit Gyrotron (LOG) are discussed. The fundamental operation allows one to use beam currents in the range from 200 A to 300 A achieve output power of the order of 9–10 MW at frequency 143.6 GHz. Mode competition calculations show that stable oscillations in the TE1,4 mode using high beam currents are possible even with the pitch factor 1.3 which is significantly lower than the design value 1.55. For the second harmonic operation, the maximum current used for excitation of the TE2,4 mode is 60 A and the optimum magnetic field is 7.6 T. A cavity design for fourth harmonic operation using the TE4,4 mode is also presented. 相似文献
9.
10.
An equation for the envelope of an azimuthally symmetric relativistic electron beam with an arbitrary self-similar profile is derived. It includes the nonlaminarity of the beam and its scattering by the residual gas, as well as the presence of a longitudinal magnetic field and a focusing radial electric field produced by the ionic background. 相似文献