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Implementing method of optimum front-end conditioner based on Butterworth filter

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Nuclear Science and Techniques 2006年第4期17卷 232-236页

作者： ZHANG Ruan-Yu luo xiao-bing LI Tai-Hua Key Laboratory for Radiation Physics and Technology of Ministry of Education of China Physics Science and Technology College of Sichuan University Chengdu 610064 China

The front-end conditioner is an essential part of digital systems of nuclear spectrometer, which functions in two ways: (1) prevents saturation of the subsequent ADC; (2) limits the bandwidth of frequency to realize anti-aliasing. To realize the above-mentioned functions, an optimum front-end conditioner for a resistive feedback charge-sensitive preamplifier is designed. In the conditioner, the pole-zero compensation (P/Z compensation) tech- nique was used to effectively filter signals from the preamplifier. The Butterworth filter was improved after the pole-zero position was optimally set up to shape the wave of output, which tallied with the whole system. The front-end conditioner can resolve the aberration of waveform of nuclear signals in a regular Butterworth filter. Com- pared with the traditional triple-pole filtering circuitry, the circuitry of this conditioner is more compact and flexible. Moreover, its output waveform is more symmetrical and the signal-to-noise ratio (SNR) is higher. The improvement in the resolution of spectrometer is also significant.

关键词：数字式核子能谱仪极点-零点补偿巴特沃斯滤波器前端调节器

Analytic Study of a Bose-Einstein Condensate in Waveguide with an Obstacle Potential

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Communications in Theoretical Physics 2008年第7期50卷 89-94页

作者： SONG Jian-Wen HAI Wen-Hua ZHONG Hong-Hua luo xiao-bing Department of Physics Hunan Normal University Changsha 410081 China Institute of Physics the Chinese Academy of Sciences Beijing 100080 China

We investigate the exact solutions of one-dimensional (1D) time-independent Gross-Pitaevskii equation(GPE),which governs a Bose-Einstein condensate (BEC) in the magnetic waveguide with a square-Sech *** bound state and transmission state are found and the corresponding spatial configurations and transport propertiesof BEC are *** is shown that the well-known absolute transmission of the linear system can occur in theconsidered nonlinear system.

关键词： square-Sech potential exact solutions bound state transmission state absolute transmission

Enhancement of Localization in a Driven Four-Well System with Second-Order Coupling

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Chinese Physics Letters 2013年第11期30卷 29-32页

作者： LI Li-Ping luo xiao-bing HU Qiang-Lin YU xiao-Guang Information Engineer School Huanghe Science and Technology CollegeZhengzhou 450006 Department of Physics Jinggangshan UniversityJi'an 343009 Department of Physics Tsinghua UniversityBeijing 100084

We study theoretically the effect of second-order coupling(SOC)on the tunneling dynamics in a planar four-well system with only one well periodically *** find that SOC between next-nearest neighboring wells facilitates *** to SOC,the suppression of tunneling occurs over a finite range of parameters,in stark contrast to the normal coherent destruction of tunneling in the nearest-neighbor tight-binding *** counter-intuitive phenomenon of SOC-enhanced localization can be attributed to the existence of a localized Floquet state rather than the degeneracy of quasi-energy levels in such a system.

关键词： tunneling nearest attributed

Performance Study of Copper-Bearing High Strength Ship-Hull Steel

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Journal of Iron and Steel Research International 2011年第S1期18卷 422-426页

作者： luo xiao-bing,YANG Cai-fu,SU Hang,CHAI Feng (Central Iron and Steel Research Institute,Institute for Structural Materials,Beijing 100081,China) Cent Iron & Steel Res Inst Inst Struct Mat Beijing 100081 Peoples R China

The variation in microstructures and the mechanical properties of a Copper-bearing high strength ship-hull steel at different aging temperature was *** peak strength was obtained at the aging temperature of 450 ℃,which was attribute to the plentiful Cu precipitates and a bit of Nb(C,N).In the over-aged condition,both the partial recovery of matrix and the coarsening of Cu particles (10-60 nm) caused the loss of the yield strength (YS) and the improvement of *** increase of the ultimate tensile strength (UTS) at aging temperature above 660℃ due to the formation of alloy-rich island structure transformed from the austenite phase upon cooling,and complied with the mixture *** copper-bearing ship steel can exhibit an excellent combination of high strength and toughness while aging at 660 ℃ for 2 hours (UTS-818 MPa,YS-745 MPa,Akv-161 J at-40℃).

关键词： copper-bearing aging HSLA ship-hull steel

Study of nuclear reaction method for the determination of protein content in wheat seeds

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Nuclear Science and Techniques 2005年第6期16卷 338-340页

作者： luo xiao-bing ZHANG Ruan-Yu CHEN Shi-Guo LI Tai-Hua AN Zhu CAO Yang-Shu Key Laboratory for Radiation Physics and Technology of Education Ministry Institute of Nuclear Science and Technology Sichuan University Chengdu 610064

A 13.4 MeV deuteron beam from the 1.2 meter cyclotron of Sichuan University was used to determine theprotein content in wheat seeds on the basis of (d,p) reactions. The influence of the variation of the water content ... 详细信息

关键词：核反应小麦种子放射化学分子谷蛋白

Activation Cross Section Measurement for the ^(165)Ho(n,γ)^(166)Ho^(m) Reaction

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Chinese journal of nuclear physics 1995年第1期17卷 43-44页

作者： Xia Yi-jun Long Xian-guan luo xiao-bing Yang Zhi-hua Liu Man-tian Wang Chun-hao Yang Jing-fu He Fu-qing Peng Xiu-feng Lu Han-lin Institute of Nuclear Science and Technology Sichuan UniversityChengdu 610064 China INstitute of Atomic Energy.P.O.Box 275(3).Beijing 102413

The cross sections for the 165Ho（n.γ）166Ho? reaction have been measured rel-ative to the 197Au（n.γ）198Au reaction at neutron energies of 203,676 and 974 keV usingthe activation technique in combination With high... 详细信息

关键词： Activation technique ^(165)Ho(n,γ)^(166)Ho^(m) Activation cross section

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用溶剂萃取法从紫金山铜矿硐坑水中回收铜

湿法冶金 2012年第6期31卷 366-368页

作者：罗小兵福建省上杭紫金山金铜矿铜矿湿法厂福建上杭364200

研究了用溶剂萃取法从紫金山铜矿含铜硐坑水中回收铜。所收阴极铜纯度为99.99%,萃余液铜质量浓度低于50mg/L,铜回收率达94%。同时采用絮凝法加快中和渣浆沉降速度,上清液达到国家矿山Ⅰ类水外排标准。该法有利于降低废水治理成本、减小... 详细信息

研究了用溶剂萃取法从紫金山铜矿含铜硐坑水中回收铜。所收阴极铜纯度为99.99%,萃余液铜质量浓度低于50mg/L,铜回收率达94%。同时采用絮凝法加快中和渣浆沉降速度,上清液达到国家矿山Ⅰ类水外排标准。该法有利于降低废水治理成本、减小中和渣量,有较好的经济效益和社会效益。

关键词：矿山废水铜溶剂萃取回收

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深紫外LED封装技术现状与展望

发光学报 2021年第4期42卷 542-559页

作者：彭洋陈明祥罗小兵华中科技大学航空航天学院湖北武汉430074 华中科技大学机械科学与工程学院湖北武汉430074 华中科技大学能源与动力工程学院湖北武汉430074

深紫外发光二极管(Deep-ultraviolet light-emitting diode,DUV-LED)具有环保无汞、寿命长、功耗低、响应快、结构轻巧等诸多优势,在杀菌消毒、生化检测、医疗健康、隐秘通讯等领域具有重要应用价值。近年来,深紫外LED技术取得了快速发... 详细信息

深紫外发光二极管(Deep-ultraviolet light-emitting diode,DUV-LED)具有环保无汞、寿命长、功耗低、响应快、结构轻巧等诸多优势,在杀菌消毒、生化检测、医疗健康、隐秘通讯等领域具有重要应用价值。近年来,深紫外LED技术取得了快速发展,主要体现在光效和可靠性的不断提高,这一方面得益于芯片制造过程中氮化物材料外延和掺杂技术的进步,另一方面归功于深紫外LED封装技术的发展。但是,与波长较长的近紫外和蓝光LED相比,深紫外LED的光效和可靠性仍有很大提升空间。本综述重点对深紫外LED封装关键技术进行了系统分析,包括封装材料选择、封装结构设计、封装工艺优化、反射光损耗机制以及结温和热管理等,同时从提高光效与器件可靠性角度阐述了深紫外LED封装的最新研究进展,并对后续技术发展进行了展望。

关键词：深紫外LED 封装技术光效可靠性

周期驱动的二能级系统中的准宇称-时间对称动力学

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物理学报 2022年第7期71卷 175-186页

作者：胡洲曾招云唐佳罗小兵浙江理工大学物理系杭州310018 井冈山大学数理学院吉安343009

本文研究了一个周期驱动的非宇称-时间对称二能级量子系统的非厄米动力学.通过经典相空间分析方法,解出了该非厄米系统的Floquet态和准能谱,并解析构造了由该非厄米哈密顿量支配下的量子态的非幺正时间演化算符,给出了不同参数区域的量... 详细信息

本文研究了一个周期驱动的非宇称-时间对称二能级量子系统的非厄米动力学.通过经典相空间分析方法,解出了该非厄米系统的Floquet态和准能谱,并解析构造了由该非厄米哈密顿量支配下的量子态的非幺正时间演化算符,给出了不同参数区域的量子态演化.本文数值和分析证明,该非宇称-时间对称二能级Floquet系统,类似于宇称-时间对称系统,存在一个准能谱从实数谱到复数谱的相变.本文还揭示了在量子态的动态演化中存在一种准宇称-时间对称动力学,即,该系统的粒子布居概率演化完全满足时间空间对称(宇称-时间对称),但是由于相位演化违反了宇称-时间对称性的要求,因此包含相位信息的量子态演化不满足时间空间对称(宇称-时间对称).这些结果加深了对非厄米物理的理解,拓展和推广了传统的宇称-时间对称概念.

关键词：宇称-时间对称周期驱动二能级系统非厄米物理动力学演化

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