实现混沌同步的非线性变量反馈控制方法

应用非线性变量反馈控制法，通过李雅普诺夫函数方法和尝试法，分别构造了一些非线性反馈函数，并用以实现了对Ｒｏｓｓｌｅｒ系统和改进的Ｌｏｒｅｎｚ系统混沌同步，２种方法起着相互补充的作用。     

实现混沌同步的非线性变量反馈控制法

应用非线性变量反馈控制法，通过李雅普诺夫函数方法和尝试法，分别构造了一些非线性反馈函数，并用以实现了对Ｒｏｓｓｌｅｒ系统和改进的Ｌｏｒｅｎｚ系统的混沌同步。２种方法起着相互补充的作用。     

超混沌系统的控制

将反馈精确线性化的方法用于超混沌用于超混沌系统的控制。并针对超混沌Ｒｏｓｓｌｅｒ设计了控制器,使该系统实现了全局稳定（稳化）,同时还能实现对原系统的任意不稳定平衡点和周期信号的稳态跟踪。仿真结果证实了此方法的有效性,并且数值分析了闭环系统的鲁棒性。     

用非线性反馈函数法研究蔡电子线路的混沌同步

应用非线性控制的基本思想及李雅普诺夫函数方法，将解析与数值法相结合对著名的蔡电子线路，找到了一些非线性反馈函数并实现了混沌同步。该方法具有同步时间短、适应性较广，对某些非线性系统较为简便、有效等优点。     

应用数学与计算机技术：混沌密码编码研究

本工作以国内外在混沌序列密码和单向Hash函数及分组密码方面的一些研究进展，包括基于一维无限折叠映射的前馈型序列密码、基于m序列扰动的混沌序列密码、基于数字滤波器结构的混沌序列密码、基于混沌序列驱动的序列密码以及单向Hash算法的研究等为据，进行混沌密码编码研究。     

大豆Bragg超结瘤突变系辐射敏感性的改变

１０．７５ＧｙＸ射线照射后，大豆Ｂｒａｇｇ超结瘤突变系ｎｔｓ３８２和ｎｔｓ２４６第一对真叶绿素含量较Ｂｒａｇｇ显著下降。随后发育出的叶片出现畸形改变，并呈现叶绿素缺失的斑块。１０．７５Ｇｙ的照射显著抑制三者的生长，其中对ｎｔｓ３８２和ｎｔｓ２４６的抑制程度显著高于Ｂｒａｇｇ。     

用FIR滤波器—PPSV实现混沌和超混沌控制

利用数字ＦＩＲ滤波器和正比于系统变量的脉冲反馈法的级联控制非线性连续系统中的混沌和超混沌。以实数Ｌｏｒｅｎｚ系统和复数洛仑兹－哈肯系统为例进行了数值研究。结果表明：ＦＲＩ－ＰＰＳＶ级联控制法比仅用ＦＩＲ滤波法或ＰＰＳＶ法更能有效地控制非线性连续系统中的混沌和超混沌,且抗噪性能ＰＰＳＶ法有显著提高。     

模型试验研究SPECT滤波函数的最佳选择

目的：为了寻找临床应用中ＳＰＥＣＴ滤波函数的最佳选择，方法，我们用Ｊａｓｃｚａｋ模型进行了模拟试验，模拟的主要参数为信息量和空间分辨，信息量用高计数和低计数模拟，空间分辨改变滤波器函数种类和滤波参数模拟，共模拟８种条件，结果：８种条件中，低计数以Ｂｕｔｔｅｒｗｏｒｔｈ０．５截止频率为最佳，高计数时以Ｂｕｔｔｅｒｗｏｒｔｈ０．７截止频率为最佳，结论：临床ＳＰＥＣＴ滤波不能单用Ｒａｍｐ滤波函数Ｂｕｔｔ     

β衰变核素活度绝对测定准确度的改善：I.最可几活度的确定

应用费米理论计算了７０余种核素的β谱形、效率关系，研究了某些核素在低能区的归一化效率函数。通过估算归一化效率函数，指导实验测定最佳多项式拟合方幂和γ窗位置、确定最可几活度，并用于效率示踪技术。给出了＾１３４Ｃｓ、＾１７７Ｌｕ、＾１４７Ｎｄ、＾１２４Ｓｂ和＾６３Ｎｉ的计算和测定结果。     

油气工业中放射性废物的处理和处置

油气的开采会产生大量的放射性废物,对放射性废物的处理与处置事关公众和环境的辐射安全问题。本文从油气工业放射性废物的源项和存在形式等特征出发,对放射性废物的临时贮存、污染设备的去污及放射性废物的处理、处置过程中涉及的技术方法和相关管理要求进行了介绍,为实践中选择合理可行的处理、处置方案以及建立油气工业放射性废物监管体系提供借鉴和参考。     

Dynamic analysis and evolution of mixed materials bombarded with multiple ions beams

Materials modification and response to the impact of energetic particles is an important ongoing research area in several applications. This includes both experimental and theoretical work. We updated and improved our models for the simulation of Ion Transport in Materials and Compounds (ITMC-DYN), part of HEIGHTS package, to now include dynamic changing of materials composition as result of multiple ion beams bombardment and target atoms mixing, segregation, and diffusion. Implemented models consider detail processes of simultaneous and multiple ions penetration and mixing, scattering, reflection, physical and chemical sputtering of composite material atoms, dynamic surface evolution/modification, thermal diffusion, and surface segregation and recombination of species in multicomponent alloys. For benchmarking of the models we compared our simulations results with several recent experimental data for nanoapplications and for the developments of future fusion energy systems. Simulation of tungsten surface evolution and modification under the impact of hydrogen ions with carbon impurities demonstrated good agreement with recent experiments. Details of surface erosion and conditions for blisters formation as a function of fluence and material temperature were also analyzed and explained.     

Safety functions and component classification for the HTR-10

In the design and construction of the HTR-10, the standards and criteria of design and manufacture for structures, systems and components must be defined. This paper refers to the relative nuclear safety codes to formulate the principles of safety classification and the relative requirements of design and manufacture, according to the safety philosophy and feature of the HTR-10, and the requirements for safety functions of structures, systems and components. We can find practical use and application meaning of this work in the design and manufacture of the HTR-10. It will be used to ensure the safety and reliability of the HTR-10.     

Developments and needs in nuclear analysis of fusion technology

Nuclear analyses provide essential input to the conceptual design, optimisation, engineering and safety case of fusion technology in current experiments, ITER, next-step devices and power plant studies. Calculations are intricate and computer-intensive, typically requiring detailed geometry models, sophisticated acceleration algorithms, high-performance parallel computations, and coupling of large and complex transport and activation codes and databases. This paper reports progress on some key areas in the development of tools and methods to meet the specific needs of fusion nuclear analyses. In particular, advances in the production and modernisation of reference models, in the preparation and quality assurance of acceleration algorithms and coupling schemes, and in the evaluation and adaptation of alternative transport codes are presented. Emphasis is given to ITER-relevant activities, which are the main driver of advances in the field. Discussion is made of the importance of efforts in these and other areas, considering some of the more pressing needs and requirements. In some cases, they call for a more efficient and coordinated use of the scarce resources available.     

湖南省2016年度临床核医学和放射治疗频度调查与分析

为了了解湖南省临床核医学和放射治疗的基本现状与其相应的频度水平,采用普查与抽样调查相结合的形式,对湖南地区所有开展临床核医学和放射治疗的医疗机构进行基本情况调查,对抽样医院进行分性别、年龄段及诊疗类型的频次调查。结果表明,湖南省临床核医学诊断与治疗年频率分别为1.37和0.139人次/千人口,放射治疗年频率为0.412人次/千人口。与1998年进行的全省医疗照射频度调查进行对比,湖南省临床核医学和放射治疗的频度水平有大幅度的增长,并且随着社会经济的发展必将继续增加。做好患者与工作人员的放射防护,做好诊断和治疗过程中的质量控制是需重点关注的问题。     

Radiation survey of radioactive objects at the Kirovo-Chepetsk chemical combine

The methods and means for performing a radiation survey of objects and grounds of the Kirovo-Chepetsk Chemical Combine are presented. Results of a survey of rooms in the combine and measurements of soil contamination levels on the grounds and of the specific activity of samples of radioactive wastes in temporary repositories and slag dumps are presented. The surveys make it possible to develop a concept and a project for rehabilitating these objects and grounds and to choose a technology for handling radioactive wastes during liquidation or preservation of repositories.     

Compatibility of fuel-element cladding materials with gallium-containing uranium and uranium–plutonium oxide fuel

Powders of uranium oxide powder and mixed fuel containing 5 and 20 mass % plutonium and 0.4 and 5 mass % gallium were prepared by coprecipitation from nitrate solutions. Pelleted samples for testing were made by cold pressing and sintering. The compatibility of uranium oxide fuel and mixed uranium–plutonium fuel, containing 0.4 and 5 mass % gallium, with the zirconium alloy E-110 at 400 and 500°C and ChS-68 corrosion-resistant steel at 650 and 750°C over periods of 1000, 2000, and 3000 h was investigated. Metallographic and x-ray spectral microprobe analyses of diffusion samples established that there was no interaction and penetration of gallium into the zirconium alloy and steel. In addition, the diffusion coefficient of metallic gallium in zirconium alloy and the distribution of the elements on interaction of gallium with ChS-68 steel were evaluated.     

Hastelloy C-276/316L脉冲激光异质焊接微观组织研究

为评价激光焊接AP1000部件工艺的可靠性,探究Hastelloy C-276与316L异质焊接焊缝的元素偏析及组织结构,利用Nd:YAG脉冲激光进行焊接,借助光学显微镜和电子探针X射线微区分析仪等分析测试仪器,对焊缝显微组织、元素成分及金相形貌进行分析。结果表明：焊缝组织晶粒细化,焊缝中部以细小等轴晶为主、边缘以柱状晶为主,且焊接接头两侧热影响区极窄;依据元素宏观分布,焊缝可分为3个区域,焊缝两侧元素成分急剧变化,中部均匀;元素存在微观偏析,晶界处Mo元素富集。焊缝组织以γ奥氏体为主,并未发现明显δ铁素体生成。     

Crack growth and fracture behaviour of pipes with circumferential defects under internal pressure and superimposed alternating bending load

Pipes made of 20 MnMoNi 5 5 steel and an MnMoNiV special melt, with an external diameter of 800 mm, wall thickness of 47 mm and length of up to 5500 mm, were provided with circumferential defects of defined length and depth. The pipes were loaded by internal pressure and a superimposed alternating bending moment. During the tests, deformation and crack growth were determined in the wall thickness and circumferential direction, and these were compared with calculated values. Pipes with an outer diameter of 226 mm and a wall thickness of 20 mm were used to investigate the leak-before-break behaviour in the dynamic sphere. These pipes also were made of 20 MnMoNi 5 5 steel and an MnMoNiV special melt, and were loaded with internal pressure and an alternating bending moment. The excitation took place at the resonance frequency of the pipes. The pipes also contained circumferential defects of defined length and depth.     

芥兰豆冷食菜辐照杀菌的研究

本文研究了芥兰豆冷食菜和李斯特菌(Listeria innocua L83)经~(60)Coγ射线辐照后的杀菌效应,以及辐照对感官品质的影响。研究结果表明,接种于芥兰豆中的李斯特菌辐照杀菌的D10值为0.264kGy,1.2kGy辐照处理李斯特菌的杀菌率达99.996%;2.0kGy以下的辐照剂量处理能使冷食菜中的微生物降低2–3数量级,杀菌率达98%以上,降低接种于冷食菜中的李斯特菌6个数量级以上,并对感官品质没有明显的影响。辐照能有效地提高芥兰豆冷食菜的卫生安全,芥兰豆冷食菜辐照杀菌具有一定的实际应用意义。