检索结果-南通市图书馆

Effect of Varieties on Tea Pigment and chromatic aberration of Black Tea Infusion

在线全文

学校读者我要写书评

暂无评论

Agricultural Science & Technology 2014年第10期15卷 1654-1659页

作者：刘千录江用文江和源张建勇滑金杰徐斌薛金金中国农业科学院茶叶研究所农业部茶树生物学与资源利用重点实验室浙江省茶叶加工程实验室浙江杭州310008 中国农业科学院研究生院北京100081

Effects of varieties on the content of tea pigment, L＊, a＊ and b＊ value of chromatic aberration of black tea infusion was studied. The correlation relationship between content of TF, TR, TB and L＊, a＊, b＊ value was extremely significant at P＆lt;0.05. Fresh tea leaves with plucking standard of 1 bud and 2 leaves could man-ufacture black tea with higher content of tea pigment, higher a＊ and b＊ value but lower L＊ value, than those of plucking standard of 1 bud and 3 leaves. But the discrepancy of certain parameter of the two plucking standards changed with vari-eties. Varieties’ quality potential could be concealed by improper plucking standards. Six varieties were divided into four groups on the basis of gross tea polyphenols in fresh tea leaves （GTP）, consumption of tea polyphenols to gross tea polyphenols ratio （CTP/GTP） and gross tea pigment to consumption of tea polyphenols ratio （GP/CTP）. Hybrid performed the very suitability of black tea manufacturing. To en-sure high quality of made black tea, suitable variety should be chosen and reason-able plucking standard also should be taken into consideration.

关键词： Varieties Plucking Standard Tea Pigment chromatic aberration Correlation Analysis ANOVA Analysis

Simultaneous quantification of longitudinal and transverse ocular chromatic aberrations with Hartmann-Shack wavefront sensor

在线全文

学校读者我要写书评

暂无评论

Journal of Innovative Optical Health Sciences 2018年第4期11卷 81-91页

作者： Yangchun Deng Junlei Zhao Yun Dai Yudong Zhang The Key Laboratory on Adaptive Optics Chinese Academy of Sciences Chengdu 610209 P.R.China The Laboratory on Adaptive Optics Institute of Optics and Electronics Chinese Academy of Sciences Chengdu 610209 P.R.China University of Chinese Academy of Sciences Beijing 100049 P.R.China

A simple method to objectively and simultaneously measure eye's longitudinal and transverse chromatic aberrations was proposed.A dual-wavelength wavefront measurement system using two Hartmann-Shack wavefront sensors was *** wavefronts of the red(639.1 nm)and near-infrared(786.0 nm)lights were measured simultaneously for different positions in the model *** chromatic wavefronts were converted into Zernike *** Zernike tilt cofficient(irst term)was used to calculate the transverse chromatic aberration along the ax-direction,while the Zernike defocus coefficient(fourth term)was used to calculate the longi-tudinal chromatic *** measurement and simulation data were consistent.

关键词： chromatic aberration Hartmann-Shack wavefront sensor simultaneity Zernike coefficient

Three-dimensional hexapole focusing of pulsed molecular beam for state selection

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2017年第8期26卷 175-180页

作者：柯毅邓小兵胡忠坤 Key Laboratory of Fundamental Physical Quantities Measurements Ministry of EducationSchool of PhysicsHuazhong University of Science and TechnologyWuhan 430074China

We theoretically investigate three-dimensional （3D） focusing of pulsed molecular beam using a series of hexapoles with different orientations. Transversely oriented hexapoles provide both the transverse and longitudinal focusing force and a longitudinally oriented one provides only the transverse force. The hexapole focusing position are designed to realize the simultaneous focusing in three directions. The additional longitudinal focusing compared with the conventional hexapole can suppress the effect of chromatic aberration induced by the molecular longitudinal velocity spread, thus improving the state-selection purity as well as the beam density. Performance comparison of state selection between this 3D focusing hexapole and a conventional one is made using numerical trajectory simulations, choosing CHF3 molecules as a tester. It is confirmed that our proposal can improve the state-selection purity from 68.2% to 96.1% and the beam density by a factor of 2.3.

关键词： hexapole focusing state selection chromatic aberration

Image blur in high energy proton radiography

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2013年第6期37卷 100-105页

作者：魏涛杨国君龙继东石金水 Institute of Fluid Physics China Academy of Engineering Physics

Proton radiography has provided a potential development direction for advanced hydrotesting, and its image blur is a crucial point that needs to be deeply studied. In this article, numerical simulation by using the Monte Carlo code Geant4 has been implemented to investigate the entire physics mechanism of high energy proton beam travelling through the object and beamline and arriving at the image plane. This article will mainly discuss the various factors which cause the image blur, including the chromatic aberration of the imaging beamline, the insumcient modulation of an incident particle＇s transverse displacement and angle deviation, the longitudinal length of an object, the influence of containment vessel and otherwise.

关键词： proton radiography image blur chromatic aberration scattering containment vessel

Multi-layer magnetic recording driven by a tunable laser

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2020年第10期18卷 63-68页

作者： Xiaoqiang Zhang Guanghao Rui Yong Xu Fan Zhang Yinchang Du Mingtao Lian Xiaoyang Lin Anting Wang Hai Ming Weisheng Zhao Hefei Innovation Research Institute School of MicroelectronicsBeihang UniversityHefei 230013China Fert Beijing Institute BDBCBeihang UniversityBeijing 100191China Advanced Photonics Center Southeast UniversityNanjing 210096China Department of Optics and Optical Engineering University of Science and Technology of ChinaHefei 230026China

All-optical magnetization switching with features of low-power consumption and high writing speed is a promising road map to satisfy the demand for volume data storage. To promote denser and faster magnetic recording technologies, herein, all-optical helicity-dependent switching(AO-HDS) in multi-layer magnetic recording is proposed based on the chromatic aberration of an optical lens(Thorlabs’ s N-BK7 plano-convex uncoated lens).The power of the incident beams and the thickness of the multi-layer magnetic recording film are designed carefully. Besides, the uniformity of this multi-layer magnetic recording is optimized. At last, a prototype system of information multiplexing based on this multi-layer magnetic recording technology is constructed as well. Flexible and controllable magnetization reversals in different layers are also demonstrated by tuning the wavelength and helicity of working beams. We believe that such a prototype system can pave the way for increasing the storage density in an effective and low-cost mode.

关键词： all-optical magnetization switching multi-level magnetic recording focal shift chromatic aberration

Systematic study of spatiotemporal influences on temporal contrast in the focal region in large-aperture broadband ultrashort petawatt lasers

在线全文

学校读者我要写书评

暂无评论

High Power Laser Science and Engineering 2018年第1期6卷 44-50页

作者： Ping Zhu Xinglong Xie Jun Kang Qingwei Yang Haidong Zhu Ailin Guo Meizhi Sun Qi Gao Ziruo Cui Xiao Liang Shunhua Yang Dongjun Zhang Jianqiang Zhu Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences

Temporal contrast is one of the crucial physical determinants which guarantee the successful performance of laser–matter interaction experiments. We generally reviewed the influences on the temporal contrast in three categories of noises based on the requirement by the physical mechanisms. The spatiotemporal influences on temporal contrast at the focal region of the chromatic aberration and propagation time difference introduced by large-aperture broadband spatial filters, which were spatiotemporally coupled with compression and focusing, were calculated and discussed with a practical case in SG-Ⅱ5 PW ultrashort petawatt laser. The system-wide spatiotemporal coupling existing in large-aperture broadband ultrashort petawatt lasers was proved to be one of the possible causes of temporal contrast degradation in the focal region.

关键词： chromatic aberration spatiotemporal coupling temporal contrast ultrashort petawatt lasers

Analysis of the aberration in Directly-writing Atom Lithography

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Lasers 2000年第1期9卷 76-79页

作者： LI Chuanwen CAI Weiquan WANG Yuzhu (Laboratory for Quantum Optics, Shanghai Institute of Optics and Fine Mechanics, The Chinese Academy of Sciences, Shanghai 201800, China) 中科院上海光学精密机械所量子光学开放实验室上海

1　Ｉｎｔｒｏｄｕｃｔｉｏｎ　　ＳｉｎｃｅＧ．Ｔｉｍｐ＇ｓｇｒｏｕｐｏｂｓｅｒｖｅｄｌｉｇｈｔｄｉｆｆｒａｃｔｉｏｎｆｒｏｍｃｈａｎｎｅｌｉｚｅｄａｔｏｍｓｉｎ1992［1］，ｌｉｔｈｏｇｒａｐｈｙｗｉｔｈＮａ，Ｃｒ，ａｎ... 详细信息

1　Ｉｎｔｒｏｄｕｃｔｉｏｎ　　ＳｉｎｃｅＧ．Ｔｉｍｐ＇ｓｇｒｏｕｐｏｂｓｅｒｖｅｄｌｉｇｈｔｄｉｆｆｒａｃｔｉｏｎｆｒｏｍｃｈａｎｎｅｌｉｚｅｄａｔｏｍｓｉｎ1992［1］，ｌｉｔｈｏｇｒａｐｈｙｗｉｔｈＮａ，Ｃｒ，ａｎｄＡｌａｔｏｍｉｃｂｅａｍｈａｓｂ...

关键词： atom lithography spherical aberration chromatic aberration