中国科学院机构知识库网格系统: 检索

Azimuthal transverse single-spin asymmetries of inclusive jets and charged pions within jets from polarized-proton collisions at root s=500 GeV 期刊论文 OAI收割
PHYSICAL REVIEW D, 2018, 卷号: 97, 期号: 3, 页码: -
作者: Adamczyk, L; Adams, JR; Adkins, JK; Agakishiev, G; Aggarwal, MM

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收藏 | 浏览/下载：62/0 | 提交时间：2018/09/06

Deep-inelastic Scattering High Chi-f Sivers Asymmetries Analyzing-power Electromagnetic Calorimeter Quantum Chromodynamics Pi-0 Production Drell-yan Star Collins

Initial Research of np Scattering with Polarized Deuterium Target at ANKE/COSY 会议论文 OAI收割
作者: ANKE Collaboration; Gao, H; Gou, B.; Ma, BQ

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收藏 | 浏览/下载：15/0 | 提交时间：2018/08/20

Quasi-free charge-exchange proton-neutron scattering polarized deuterium target analyzing power

Initial Research of np Scattering with Polarized Deuterium Target at ANKE/COSY 会议论文 OAI收割
作者: Gou, B.; ANKE Collaboration; Gao, H; Ma, BQ

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收藏 | 浏览/下载：23/0 | 提交时间：2018/08/20

Quasi-free charge-exchange proton-neutron scattering polarized deuterium target analyzing power

High power diode laser with beam coupling (EI CONFERENCE) 会议论文 OAI收割
Optoelectronic Materials and Devices III, October 27, 2008 - October 30, 2008, Hangzhou, China
作者: Wang L.; Liu Y.; Wang L.; Liu Y.; Liu Y.

收藏 | 浏览/下载：59/0 | 提交时间：2013/03/25

As the increasing applications of the semiconductor lasers in the laser processing the single 2-D stack optic-power density has not satisfied the actual requirements. It demands to couple several diode laser stack beams to one to improve the brightness and it becomes the central issue to adopt the appropriate beam coupling technology which would offer high quality and high efficiency. In this paper it mainly introduces the beam shaping and the technology of spatial coupling polarization coupling and wavelength coupling. The coupling key elements are presented and indicated. Finally the development of the diode laser on beam coupling in our country fell behind through analyzing the statement of the world. Our lab is studying on polarization coupling and wavelength coupling. We gain some results by phase which the polarization coupling efficiency can achieve 90% for two LD stacks with seven bars whose luminous wavelength is 975nm and980nm.By two 808nm diode laser coupling the efficiency of 60% can be achieved after focusing to the beam size of 22mm2. 2008 SPIE.

Proton elastic scattering from Be-14 and halo effects 期刊论文 OAI收割
COMMUNICATIONS IN THEORETICAL PHYSICS, 2006, 卷号: 46, 页码: 711-716
作者: Gu Bai-Ping; Ren Zhong-Zhou

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收藏 | 浏览/下载：12/0 | 提交时间：2018/05/31

halo nuclei proton elastic scattering RIA differential cross section analyzing power spin rotation function

CR image filter methods research based on wavelet-domain hidden markov models (EI CONFERENCE) 会议论文 OAI收割
ICO20: Optical Information Processing, August 21, 2005 - August 26, 2005, Changchun, China
作者: Wang J.-L.; Wang J.-L.; Li D.-Y.; Wang Y.-P.

收藏 | 浏览/下载：18/0 | 提交时间：2013/03/25

In the procedure of computed radiography imaging we should firstly get across the characters of kinds of noises and the relationship between the image signals and noises. Based on the specialties of computed radiography (CR) images and medical image processing we have study the filtering methods for computed radiography images noises. On the base of analyzing computed radiography imaging system in detail the author think that the major two noises are Gaussian white noise and Poisson noise. Then the different relationship of between two kinds of noises and signal were studied completely. By considering both the characteristics of computed radiography images and the statistical features of wavelet transformed images a multiscale image filtering algorithm which based on two-state hidden markov model (HMM) and mixture Gaussian statistical model has been used to decrease the Gaussian white noise in computed images. By using EM (Expectation Maximization) algorithm to estimate noise coefficients in each scale and obtain power spectrum matrix then this carried through the syncretized two Filter that are IIR(infinite impulse response) Wiener Filter and HMM according to scale size and achieve the experiments as well as the comparison with other denoising methods were presented at last.

Study of removing striping noise in CCD image (EI CONFERENCE) 会议论文 OAI收割
ICO20: Optical Information Processing, August 21, 2005 - August 26, 2005, Changchun, China
作者: Liu H.; Liu H.; Liu H.

收藏 | 浏览/下载：16/0 | 提交时间：2013/03/25

Striping noise is the common system noise during formation of image using linear array CCD and has the character of periodicity directivity and banding distributing. It can be caused by errors in internal calibration devices or by slight gain/offset differences among the elements that conform the array of detectors. Striping noise covers up useful information in CCD image and brings adverse effect to image interpretation. On the basis of analyzing wavelet decomposed coefficient the regularities of distribution about striping noise in wavelet coefficient is found thereby the method of wavelet threshold selection which is suitable to striping noise distribution is put forward. According to Donoho's method about denoising using wavelet the image including striping noise is processed. Comparing the power spectrum of processed image with the one of original image polluted by striping noise in frequency field we find pulse brought by striping noise is removed and the goal which reserves image details and reduces stripes is achieved.

LD-Pumped all-solid-stated green laser with high polarization rate and high conversion efficiency (EI CONFERENCE) 会议论文 OAI收割
Optoelectronic Materials and Devices for Optical Communications, November 7, 2005 - November 10, 2005, Shanghai, China
Hao E.-J.; Tan H.-M.; Yan C.-L.; Qian L.-S.

收藏 | 浏览/下载：23/0 | 提交时间：2013/03/25

A high-power-output and high polarization rate Nd:YVO4/ KTP green laser has been presented. By analyzing the factors which affect the conversion efficiency and polarization rate we used a short folded-cavity resonator the maximum output power of 320 mW is obtained at 532 nm with the LD pumping power of 1 W the optical-to-optical conversion efficiency is 32% and the polarization rate is 550:1.

Theoretical analysis of 980nm high power Vertical External-cavity Surface-emitting Semiconductor Laser (VECSEL) (EI CONFERENCE) 会议论文 OAI收割
ICO20: Lasers and Laser Technologies, August 21, 2005 - August 26, 2005, Changchun, China
作者: Wang L.-J.; Wang L.-J.; Ning Y.-Q.; Qin L.

收藏 | 浏览/下载：22/0 | 提交时间：2013/03/25

By using bottom-emitting structure we will develop laser diode (LD) pumped 980 nm VECSEL with active region of InGaAs/GaAsP/AlGaAs system. Because the thickness of barrier layer and absorption layer exceed that of quantum well single well approximation model (KP method) can be used to calculate the band structure of VECSEL. The Schrodinger equation of finite deep potential well can be adopted to calculate the energy level structures of electron heavy and light holes. According to the transition selection rule we theoretically obtained the emitting wavelength of VECSEL and calculated quasi-Femi energy of valence band and conduction band based on the analysis of energy level structure of electron and holes. By analyzing the gain of strained quantum wells we calculated the gain of VECSEL using transition matrix elements of electron heavy and light holes. We give out the threshold gain output power and other characteristic parameters. We will study the configuration of VECSEL and pumping scheme. We designed external cavity mirror active region and bottom-emitting structure. A LD-pumped vertical external cavity surface-emitting laser whose output power is greater than 1.0 W can be predicted.

QCD INTERACTION IN PION-DEUTERON ELASTIC-SCATTERING 期刊论文 OAI收割
COMMUNICATIONS IN THEORETICAL PHYSICS, 1994, 卷号: 22, 期号: 4, 页码: 443-448
作者: LU, XF; LU, XF , SICHUAN UNIV,DEPT PHYS,CHENGDU 610064,PEOPLES R CHINA.; ZHAO, EG; LIU, YX

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收藏 | 浏览/下载：25/0 | 提交时间：2012/08/29

Differential Cross-sections Analyzing Power It11 Charge Symmetry Asymmetries Resonance