SPECTRA

作品数：1136被引量：1441H指数：13
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Beam steering characteristics in high-power quantum-cascade lasers emitting at∼4.6µm被引量：1
《Chinese Physics B》2021年第3期96-99,共4页Yong-Qiang Sun Jin-Chuan Zhang Feng-Min Cheng Chao Ning Ning Zhuo Shen-Qiang Zhai Feng-Qi Liu Jun-Qi Liu Shu-Man Liu Zhan-Guo Wang 
Project supported by the National Basic Research Program of China(Grant Nos.2018YFA0209103 and 2018YFB2200504);the National Natural Science Foundation of China(Grant Nos.61991430,61774146,61790583,61674144,and 61774150);the Key Projects of the Chinese Academy of Sciences(Grant Nos.2018147,YJKYYQ20190002,QYZDJ-SSW-JSC027,and XDB43000000).
A beam steering effect of high-power quantum cascade(QC) lasers emitting at 4.6 μm was investigated. The continuous wave(CW) output power of an uncoated, 6-mm-long, 7.5-μm-wide buried-heterostructure QC laser at 25...
关键词：beam steering quantum cascade lasers fourier transform of the spectra 2D effective-index model 
Study of optical clocks based on ultracold ^171Yb atoms被引量：3
《Chinese Physics B》2020年第9期79-83,共5页Di Ai Hao Qiao Shuang Zhang Li-Meng Luo Chang-Yue Sun Sheng Zhang Cheng-Quan Peng Qi-Chao Qi Tao-Yun Jin Min Zhou Xin-Ye Xu 
Project supported by the National Key Basic Research and Development Program of China(Grant Nos.2016YFA0302103,2017YFF0212003,and 2016YFB0501601);the Municipal Science and Technology Major Project of Shanghai,China(Grant No.2019SHDZX01);the National Natural Science Foundation of China(Grant No.11134003);the Excellent Academic Leaders Program of Shanghai,China(Grant No.12XD1402400).
The optical atomic clocks have the potential to transform global timekeeping,relying on the state-of-the-art accuracy and stability,and greatly improve the measurement precision for a wide range of scientific and tech...
关键词：cold ytterbium atoms optical clocks ultra-stable clock lasers clock-transition spectra instability and uncertainty 
Combined approach for analysing evolutionary power spectra of a track-soil system under moving random loads被引量：3
《Acta Mechanica Sinica》2019年第3期674-690,共17页Y.Zhao L.T.Si H.Ouyang 
the National Basic Research Program of China (Grant 2014CB046803);the National Natural Science Foundation of China (Grant 11772084).
The pseudo-excitation method combined with the integral transform method (PEM-ITM) is presented to investigate the ground vibration of a coupled track-soil system induced by moving random loads. Commonly in the track ...
关键词：Track-soil system MOVING random loads EVOLUTIONARY POWER spectrum Pseudo-excitation METHOD Integral transform METHOD Vibration transmission 
The spanwise spectra in wall-bounded turbulence被引量：3
《Acta Mechanica Sinica》2018年第3期452-461,共10页Hong-Ping Wang Shi-Zhao Wang Guo-Wei He 
supported by the National Natural Science Foundation of China (Grants 11302238, 11232011, 11572331, and 11490551);the support from the Strategic Priority Research Program (Grant XDB22040104);the Key Research Program of Frontier Sciences of the Chinese Academy of Sciences (Grant QYZDJ-SSW-SYS002);the National Basic Research Program of China (973 Program 2013CB834100 : Nonlinear Science)
The pre-multiplied spanwise energy spectra of streamwise velocity fluctuations are investigated in this paper. Two distinct spectral peaks in the spanwise spectra are observed in low-Reynolds-number wall-bounded turbu...
关键词：Wall-bounded turbulence Streamwise/spanwise spectra Scale separation Inner/outer peak 
4.3 THz quantum-well photodetectors with high detection sensitivity被引量：2
《Chinese Physics B》2018年第3期201-204,共4页Zhenzhen Zhang Zhanglong FU Xuguang Guo Juncheng Cao 
Project supported by the National Key R&D Program of China(Grant No.2017YFF0106302);the National Basic Research Program of of China(Grant No.2014CB339803);the National Natural Science Foundation of China(Grant Nos.61404150,61405233,and 61604161);the Shanghai Municipal Commission of Science and Technology,China(Grant Nos.15JC1403800,17ZR1448300,and 17YF1429900)
We demonstrate a high performance GaAs/AlGaAs-based quantum-well photodetector(QWP)device with a peak response frequency of 4.3 THz.The negative differential resistance(NDR)phenomenon is found in the dark currentvolta...
关键词：terahertz quantum-well photodetector negative differential resistance detection sensitivity pho-tocurrent spectra 
Damage produced on GaN surface by highly charged Krq+irradiation
《Nuclear Science and Techniques》2017年第12期220-225,共6页Li-Qing Zhang Chong-Hong Zhang Chao-Liang Xu Heng-Qing Zhang Yi-Tao Yang Jin-Yu Li Hui-Ping Liu Zhao-Nan Ding Ting-Xing Yan 
supported by the National Natural Science Foundation of China(Nos.11675231,91426304 and 11105191);the National Magnetic Confinement Fusion Program(No.2011GB108003);the National Basic Research Program of China(No.2010CB832904)
Surface morphology, compositions, microstructure and optical properties of GaN film irradiated by highly charged Kr^(q+)(q = 23, 15, 11) in two geometries to a fluence of 1×10^(15)kr^(q+)/cm^2 were studied using AFM,...
关键词：GAN HIGHLY CHARGED KRYPTON ion AFM XPS UV–Vis transmittance SPECTRA PL Raman SPECTRA 
A Monte Carlo study of the spectra from inhomogeneous accretion flow
《Research in Astronomy and Astrophysics》2017年第8期101-108,共8页Xiao-Di Yu Ya-Ping Li Fu-Guo Xie Ren-Yi Mai 
supported by the National Natural Science Foundation of China under grants 11333004, 11133005, 11573051 and U1531130;the Fundamental Research Funds for the Central Universities under grant 20720150032;supported in part by the Youth Innovation Promotion Association of CAS (id. 2016243);the National Basic Research Program of China (973 Program, grant 2014CB845800);the Strategic Priority Research Program ‘The Emergence of Cosmological Structures’ of CAS (grant XDB09000000);the CAS/SAFEA International Partnership Program for Creative Research Teams;the Natural Science Foundation of Shanghai (grant 17ZR1435800);sponsored in part by Shanghai Sailing Program (No. 17YF1422600)
A model of an inhomogeneous accretion flow,in which cold clumps are surrounded by hot gas or corona,has been proposed to explain the spectral features of black hole X-ray binaries.In this work,we try to find possible ...
关键词：ACCRETION accretion disks—X-rays binaries—stars black holes 
A method of measuring the [α/Fe] ratios from the spectra of the LAMOST survey被引量：1
《Research in Astronomy and Astrophysics》2016年第7期83-96,共14页Ji Li Chen Han Mao-Sheng Xiang Jian-Rong Shi Jing-Kun Zhao Xiao-Wei Liu Hua-Wei Zhang Hai-Bo Yuan Xuan Ci Xiao-Feng Zhang Yue-Xiang Wang Yang Huang Yong Zhang Yong-Hui Hou Yue-Fei Wang Zi-Huang Cao 
supported by the National Key Basic Research Program of China(973Program,No.2014CB845700);the National Natural Science Foundation of China(Grant Nos.U1331120,U1431106,U1531118,U1531244 and 11473001);The Guo Shou Jing Telescope(the Large Sky Area MultiObject Fiber Spectroscopic Telescope,LAMOST)is aNational Major Scientific Project built by the Chinese Academy of Sciences;provided by the National Development and Reform Commission.LAMOST is operated and managed by National Astronomical Observatories,Chinese Academy of Sciences
The [α/Fe] ratios in stars are good tracers to probe the formation history of stellar populations and the chemical evolution of the Galaxy. The spectroscopic survey of LAMOST provides a good opportunity to determine ...
关键词：GALAXY evolution stars abundances stars fundamental parameters techniques spectroscopy surveys methods data analysis 
Simultaneous acquisition of multi-nuclei enhanced NMR/MRI by solution-state dynamic nuclear polarization被引量：2
《Science China Chemistry》2016年第7期830-835,共6页Yugui He Zhen Zhang Jiwen Feng Chongyang Huang Fang Chen Chaoyang Liu Maili Liu 
supported by the Chinese Academy of Sciences(ZDYZ2010-2);the Ministry of Science and Technology of China (2011YQ120035);the National Natural Science Foundation of China (11405264,11274347,21221064,11575287)
Dynamic nuclear polarization （DNP） has become a very important hyperpolarization method because it can dramatically increase the sensitivity of nuclear magnetic resonance （NMR） of various molecules. Liquid-state D...
关键词：dynamic nuclear polarization Overhauser effect simultaneous acquisition phosphorous and sodium ion DNP spectra phosphorous DNP image 
Effects of Precipitation on Sonic Anemometer Measurements of Turbulent Fluxes in the Atmospheric Surface Layer
《Journal of Ocean University of China》2016年第3期389-398,共10页ZHANG Rongwang HUANG Jian WANG Xin ZHANG Jun A. HUANG Fei 
supported by the National Key Basic Research Program of China (Grant Nos. 2014CB953903,2015CB953904);the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA 11010403);the CAS/SAFEA International Partnership Program for Creative Research Teams
Effects caused by precipitation on the measurements of three-dimensional sonic anemometer are analyzed based on a field observational experiment conducted in Maoming, Guangdong Province, China. Obvious fluctuations in...
关键词：PRECIPITATION sonic anemometer virtual temperature ta：rbulent flux SPECTRA 
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