中国科学院机构知识库网格系统: 检索

浏览/检索结果: 共7条，第1-7条

帮助

条数/页：排序方式：
	Monte carlo simulation of biological shielding parameters in pgnaa 期刊论文 iSwitch采集 Micro & nano letters, 2018, 卷号: 13, 期号: 4, 页码: 457-460 作者: Yang, Jianbo; Peng, Kexin; Qiao, Yujie; Zhang, Can; Li, Rui 收藏 \| 浏览/下载：78/0 \| 提交时间：2019/04/23 Monte carlo methods Radiation protection Neutron activation analysis Spontaneous fission Lead Boron compounds Lithium compounds Neutron absorption Multilayers Composite material interfaces Biological effects of gamma-rays Monte carlo simulation Biological shielding parameters Pgnaa Prompt neutron activation analysis Cf-252 spontaneous fission neutron Optimised radiation protection design parameters Mcnp monte carlo code Lead shield thickness Sample chamber Neutron-absorbing materials Biological multilayer composite shield Thick pb innermost layer Moderation layer Thick paraffin Thick borax Pgnaa facility Size 2 mm to 25 cm Pb B4c B2o3 Lioh Lif
	Monte Carlo simulation of biological shielding parameters in PGNAA 期刊论文 OAI收割 MICRO & NANO LETTERS, 2018, 卷号: 13, 期号: 4, 页码: 457-460 作者: Li, R; Yang, JB; Peng, KX; Qiao, YJ; Zhang, C \| 收藏 \| 浏览/下载：67/0 \| 提交时间：2019/09/24 Monte Carlo methods radiation protection neutron activation analysis spontaneous fission lead boron compounds lithium compounds neutron absorption multilayers composite material interfaces biological effects of gamma-rays Monte Carlo simulation biological shielding parameters PGNAA prompt neutron activation analysis Cf-252 spontaneous fission neutron optimised radiation protection design parameters MCNP Monte Carlo code lead shield thickness sample chamber neutron-absorbing materials biological multilayer composite shield thick Pb innermost layer moderation layer thick paraffin thick borax PGNAA facility size 2 mm to 25 cm Pb B4C B2O3 LiOH LiF
	Comparison of artificial absorbing boundaries for acoustic wave equation modelling 期刊论文 OAI收割 EXPLORATION GEOPHYSICS, 2017, 卷号: 48, 期号: 1, 页码: 76-93 作者: Gao, Yingjie; Song, Hanjie; Zhang, Jinhai; Yao, Zhenxing \| 收藏 \| 浏览/下载：27/0 \| 提交时间：2017/11/17 Absorbing Boundary Condition Higdon Boundary Hybrid Abc Perfectly Matched Layer Sponge Boundary
	Extension of split perfectly matched absorbing layer for 2D wave propagation in porous transversely isotropic media 期刊论文 OAI收割 EXPLORATION GEOPHYSICS, 2013, 卷号: 44, 期号: 1, 页码: 25-30 作者: Qian, Jin; Wu, Shiguo; Cui, Ruofei 收藏 \| 浏览/下载：27/0 \| 提交时间：2014/07/17 modelling perfectly matched absorbing layer porous transversely isotropic media staggered-grid finite-difference
	The spectral feature analysis of semiconductor thin disk laser (EI CONFERENCE) 会议论文 OAI收割 Optoelectronic Materials and Devices II, November 2, 2007 - November 5, 2007, Wuhan, China 作者: Li J.; Wang L.-J.; Wang L.-J.; Ning Y.-Q.; Li J. 收藏 \| 浏览/下载：25/0 \| 提交时间：2013/03/25 The semiconductor thin disk laser is a new type of semiconductor laser. This work gives the basic operation function of semiconductor disk laser and analyses the heat effect by the experimentally measured photoluminescence spectrum of the laser chip at different pump power and different temperature. We can see that: with increasing pump power the thermal effects of the gain material becomes seriously and causes the saturation of carrier lifetime so the electron-hole pair created in the absorbtion layer have no enough time to rate to one of the wells and the non-radiative recombination happens in the barrier. When the thermal effects becomes stronger the chip will not lasing. This phenomenon is from the smaller energy offset between barrier and quantum well. We optimize the original structure design and experimental technology. A non-absorbing AlGaAs layer who is transparent to the pumping and laser wavelength is added to confine the carriers in the quantum wells. At the same time a DBR with double reflecting band is induced to improve the absorbing efficiency of the pumping light. The single QW is replaced by the three narrow QWs This three QWs structure can add the quantum state of QW increase the recombination probability of carriers in the QWs and reduce the heat effect. The chemical etch equipment is also improved to control the surface unevenness to be within 50 nm.
	An absorbing-layer method of 3-D seismic migration in an irregular acquisition geometry 期刊论文 OAI收割 CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION, 2002, 卷号: 45, 期号: 5, 页码: 700-706 作者: Wang, YX; Zhang, GQ; Zhou, RF \| 收藏 \| 浏览/下载：19/0 \| 提交时间：2018/07/30 irregular acquisition geometry migration absorbing layer seismic data
	Layer stripping method for potential inversion 期刊论文 OAI收割 JOURNAL OF COMPUTATIONAL MATHEMATICS, 1999, 卷号: 17, 期号: 1, 页码: 25-32 作者: Dou, XL; Zhang, GQ \| 收藏 \| 浏览/下载：14/0 \| 提交时间：2018/07/30 2-D potential inversion layer stripping method absorbing boundary condition