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浏览/检索结果: 共14条，第1-10条 帮助

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GEANT4 simulations of the neutron beam characteristics for Be-9/Li-7 targets bombarded by the low energy protons 期刊论文  OAI收割
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, 2021, 卷号: 506
作者:  Lu, Yu;  Xu, Zhao;  Zhang, Lianxin;  Wang, Zibang;  Li, Taosheng
  |  收藏  |  浏览/下载：44/0  |  提交时间：2021/11/29
Magnetostratigraphy and Authigenic Be-10/Be-9 Dating of Plio-Pleistocene Abyssal Surficial Sediments on the Southern Slope of Mariana Trench and Sedimentary Processes During the Mid-Pleistocene Transition 期刊论文  OAI收割
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, 2020, 卷号: 125, 期号: 8, 页码: 13
作者:  Yi, Liang;  Xu, Dong;  Jiang, Xingyu;  Ma, Xiaolin;  Ge, Qian
  |  收藏  |  浏览/下载：31/0  |  提交时间：2020/12/07
Magnetostratigraphy and Authigenic Be-10/Be-9 Dating of Plio-Pleistocene Abyssal Surficial Sediments on the Southern Slope of Mariana Trench and Sedimentary Processes During the Mid-Pleistocene Transition 期刊论文  OAI收割
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, 2020, 卷号: 125, 期号: 8, 页码: 13
作者:  Yi, Liang;  Xu, Dong;  Jiang, Xingyu;  Ma, Xiaolin;  Ge, Qian
  |  收藏  |  浏览/下载：32/0  |  提交时间：2020/12/29
The Potential of Marine Ferromanganese Nodules From Eastern Pacific as Recorders of Earth's Magnetic Field Changes During the Past 4.7 Myr: A Geochronological Study by Magnetic Scanning and Authigenic Be-10/Be-9 Dating 期刊论文  OAI收割
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, 2020, 卷号: 125, 期号: 7, 页码: 15
作者:  Yi, L.;  Medina-Elizalde, M.;  Kletetschka, G.;  Yao, H.;  Simon, Q.
  |  收藏  |  浏览/下载：21/0  |  提交时间：2021/01/04
The Potential of Marine Ferromanganese Nodules From Eastern Pacific as Recorders of Earth's Magnetic Field Changes During the Past 4.7 Myr: A Geochronological Study by Magnetic Scanning and Authigenic Be-10/Be-9 Dating 期刊论文  OAI收割
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, 2020, 卷号: 125, 期号: 7, 页码: 15
作者:  Yi, L.;  Medina-Elizalde, M.;  Kletetschka, G.;  Yao, H.;  Simon, Q.
  |  收藏  |  浏览/下载：46/0  |  提交时间：2021/01/08
Calculation of the wide-angle neutron spectra from the Be-9(d, xn) reaction in a thick beryllium target 期刊论文  OAI收割
CHINESE PHYSICS C, 2019, 卷号: 43, 期号: 5, 页码: 6
作者:  Ding, Yan-Yan;  Ma, Zhan-Wen;  Huang, Zhi-Wu;  Zhang, Ya-Ling;  Wang, Jun-Run
  |  收藏  |  浏览/下载：84/0  |  提交时间：2019/11/10
Direct measurement of astrophysical factor S(E) and screening potential for Be-9(p, alpha)Li-6 reaction at low energy 期刊论文  OAI收割
PHYSICS LETTERS B, 2018, 卷号: 785, 页码: 262-267
作者:  Fang Kaihong;  Zhang Qian;  Chen Bingjun;  Zhang Zhengwei;  Wang Qiang
  |  收藏  |  浏览/下载：35/0  |  提交时间：2019/03/27
Modified EPAX2 parameterization for estimating the fragment cross sections at intermediate energies 期刊论文  OAI收割
NUCLEAR PHYSICS A, 2013, 卷号: 915, 页码: 59-69
作者:  Zhang, X. H.
  |  收藏  |  浏览/下载：34/0  |  提交时间：2018/07/05
Fabrication of high-efficiency ultraviolet blazed gratings by use of direct Ar2-CHF3 ion-beam etching through a rectangular photoresist mask (EI CONFERENCE) 会议论文  OAI收割
International Symposium on Photoelectronic Detection and Imaging 2011: Sensor and Micromachined Optical Device Technologies, May 24, 2011 - May 26, 2011, Beijing, China
Tan X.
收藏  |  浏览/下载：25/0  |  提交时间：2013/03/25
In ultraviolet spectroscopy  groove irregularity and surface roughness of nanometer magnitude can cause a significant loss of diffraction efficiency. Therefore  there is a constant need to improve the diffraction efficiency. A blazed grating can concentrate most of the light intensity into a desired diffraction order  it is important to control the groove shape precisely  so it is the optimum choice among gratings of different kinds of profile. As the operating wavelength of most UV spectral applications is less than 200 nm  especially the blaze angle and the apical angle. We have presented a direct shaping method to fabricate EUV blazed gratings by using an ion-beam mixture of Ar+ and CHF2 +to etch K9 glass with a rectangular photoresist mask. With this method  the required blaze angle is small  we have succeeded in fabricating well-shaped UV blazed gratings with a 1200 line/mm groove density and 8.54 blaze angles and 1200 line/mm groove density and 11.68 blaze angles  and the metrical efficiency is about 81% and 78%. The good performance of the gratings was verified by diffraction efficiency measurements. When one uses the etching model  the conditions on the ion-beam grazing incident angle and the CHF3partial pressure should be noted. Besides  since the etched groove shape depends on the aspect ratio of the photoresist mask ridge  if we wish to fabricate larger gratings with this method  we must improve the uniformity of the photoresist mask before ion-beam etching. 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).  
Evaluation of the operating range for ground-based infrared imaging tracking system (EI CONFERENCE) 会议论文  OAI收割
International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Infrared Imaging and Applications, May 24, 2011 - May 24, 2011, Beijing, China
作者:  Zhang Z.-D.
收藏  |  浏览/下载：50/0  |  提交时间：2013/03/25
Ground-based infrared imaging tracking system (GIITS) is of great importance for aerial target warning and guard. The operating range is one of the key performance specifications  on the other  which should be calculated  calculate the radiation power received on the detector in order to analysis whether the output signal meets the detection requirements or not  analyzed and studied during the whole GIITS design process. The operating range is mostly influenced by a few factors  without considering the effect of the background radiation. By improving of the traditional method  including atmospheric attenuation  a new operating range calculation model of the GIITS was established based on two requirements. One is that the image size of observed target should meet the requirement of the processor signal extraction. The number of the pixel occupied by target image should be more than 9. The other is that the signal noise ratio (SNR) of the GIITS should not be less than 5 to meet the requirements of the target detection probability and spatial frequency. The SNR calculation equation in form of energy is deduced and the radiation characteristic of the observed target and background are analyzed. When evaluate the operating range of the GIITS using the new method  the performance of GIITS and feature of target and background. This paper firstly makes analysis and summarization on the definite localizations of the traditional operating range equation of the GIITS. The localizations are mainly in two aspects. On one hand  we should successively calculate two operating range values according to two requirements mentioned above and choose the minimum value as the analytic result. In the end  the dispersion of the image and the effect of image dispersion are not considered in the traditional method  an evaluation of operating range for fighter aircraft is accomplished as an example. The influence factors in every aspect on operating range were explored by the calculated result. The new operating range calculation model provides the theoretical basis for the design and applications as well as the comprehensive evaluation of a GIITS. 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).