C59N单分子整流器

通过将单个C59N分子置于双势垒隧道结中，从而利用单电子隧穿效应和C59N分子的特殊能级结构，我们成功地实现了一种新型的单分子整流器件．实验中这个整流器件的正向导通电压约为0．5-0．7V，反向击穿电压约为1．6—1．8V．理论分析表明，中性C59N分子的半占据费米能级以及在不同充电情况下费米能级的不对称移动是形成整流效应的主要原因．其构成原理也决定了该器件具有稳定、易重复的特点．     

Beta-delayed proton precursors with 59≦Z≦62

The new, beta-delayed proton emitters¹²⁸Pr(3.2 _?0.4 ^+0.5 s),¹³⁰Pm(2.2 _?0.4 ^+0.6 s), and¹³²Pm(5.0 _?0.6 ^+0.8 s) have been observed at the on-line isotope separator OASIS. Also studied were¹²⁹Nd and¹³³Sm. Our on-going study of the decay properties of very neutron-deficient lanthanides has led to detailed information about beta-delayed proton emitters with 59≤Z≤62. The isotopes were produced at the SuperHILAC's on-line isotope separator OASIS [1] in reactions of⁴⁰Ca projectiles on⁹²Mo and⁹⁶Ru targets enriched to >95%. Decay studies were carried out in a low background spectroscopy laboratory. The isotope of interest was passed through a slit in the focal plane of the mass separator, transported ionoptically to a fast cycling tape, and periodically positioned between a silicon charged particle telescope, a HPGe x-ray detector, and a GAMMA-X Ge detector. Decays involving beta-delayed gamma rays and protons along with any coincident positrons, x-rays and gamma rays were measured event-by-event and written to computer tape for subsequent replay and analysis.     

C59N和C19N晶体的合成

通过溶解C60的CCl4溶液在大气中的慢蒸发可以合成C59N和C19N晶体,这项实验结果为CnN(n≤59)晶体研究开辟了一种简单而有效的途径.     

Level densities for nuclei with 47 ≤ A ≤ 59

Nuclear level densities of ⁴⁷V, ⁴⁸V, ⁴⁹V, ⁵³Mn, ⁵⁴Mn, ⁵⁷Co, ⁵⁹Ni and their energy dependences are determined from measurements of the neutron evaporation spectra in the (p, n) reaction. Neutron spectra from the (p, n) reaction on nuclei of ⁴⁷Ti, ⁴⁸Ti, ⁴⁹Ti, ⁵³Cr, ⁵⁴Cr, ⁵⁷Fe, and ⁵⁹Co are measured at proton energies between 7 and 11 MeV. The data are analyzed in terms of statistical equilibrium and pre-equilibrium models of nuclear reactions.     

物理学报2010年第59卷物理学分类主题索引

<正>~~     

TI-59可编程序计算器在光学设计中的应用

本文就常见的设计方法,论述了微型可编程序计算器在光学系统设计中的应用,并结合具体公式对象差设计中的几个主要问题进行了运算。     

物理学报2010年第59卷作者拼音索引

<正>~~     

59Co(n,p)59Fe,59Co(n,α)56Mn,59Co(n,2n)58Co反应截面的测量

本实验用活化法测量了中子能量在12.8MeV到17.8MeV的⁵⁹Co(n,p)⁵⁹Fe,⁵⁹Co(n,α)⁵⁶Mn,⁵⁹Co(n,2n)⁵⁸Co三个反应道的反应截面值,实验的测量误差在3.3%—6.9%范围内.     

~(59)Co(n,p)~(59)Fe,~(59)Co(n,α)~(56)Mn,~(59)Co(n,2n)~(58)Co反应截面的测量

本实验用活化法测量了中子能量在12.8MeV到17.8MeV的~(59)Co(n,p)~(59)Fe,~(59)Co(n,α)~(56)Mn,~(59)Co(n,2n)~(58)Co三个反应道的反应截面值,实验的测量误差在3.3％—6.9％范围内. 本文还计算了反应截面测量误差的协方差矩阵,并将实验测量值与理论计算值进行了比较.另外,还对上述三个反应道的截面进行编评,给出了推荐的激发曲线.     

THE CROSS-SECTION MEASUREMENTS FOR 59Co(n,p)59Fe,59Co(n,α)56Mn AND 59Co(n,2n)58Co REACTIONS

The cross sections of ⁵⁹Co(n,p)⁵⁹Fe,⁵⁹Co(n,α)⁵⁶Mn AND ⁵⁹Co(n,2n)⁵⁸Co reactions have been measured at neutron energy region of 12.8MeV—17.8MeV by activation method.The coveriance matrix of measured errors was calculated,and the comparison between the values of measured and calculated using theory model was made.The evaluated excitation functions for the three reactions are given.     

未来全球分子光谱的市场规模将达59亿美元

正在未来几年,受多种因素影响,分子光谱的需求将会不断增加,如对药物和辅料更严格的质量要求,对食品安全的日益关注,以及分子光谱技术被广泛地用于药物研发和质量控制。然而,这些系统的高成本,以及需要熟练人员操作将是阻碍这一市场增长的主要因素。据报告显示,2013年全球分子光谱的市场规模为43亿美     

Number of 59·5 keV-photons per decay of241Am

Number of 59·5 keV-photons per decay of²⁴¹Am equal to 0·355±0·003 was determined from activity and gamma-emission rate measurements.     

Statistical properties of excited nuclei in the mass range 47 ? A ? 59

Level densities and their energy dependences for nuclei in the mass range of 47 ?? A ?? 59 were determined from the results obtained by measuring neutron-evaporation spectra in respective (p, n) reactions. The spectra of neutrons originating from the (p, n) reactions on ⁴⁷Ti, ⁴⁸Ti, ⁴⁹Ti, ⁵³Cr, ⁵⁴Cr, ⁵⁷Fe, and ⁵⁹Co nuclei were measured in the proton-energy range of 7?C11 MeV. These measurements were performed with the aid of a fast-neutron spectrometer by the time-of-flight method over the base of the EGP-15 pulsed tandem accelerator installed at the Institute for Physics and Power Engineering (Obninsk, Russia). A high resolution of the spectrometer and its stability in the time of flight made it possible to identify reliably discrete low-lying levels along with the continuum part of neutron spectra. Our measured data were analyzed within the statistical equilibrium and preequilibrium models of nuclear reactions. The respective calculations were performed with the aid of the Hauser-Feshbach formalismof statistical theory supplemented with the generalized model of a superfluid nucleus, the back-shifted Fermi gas model, and the Gilbert-Cameron composite formula for nuclear level densities. Nuclear level densities for ⁴⁷V, ⁴⁸V, ⁴⁹V, ⁵³Mn, ⁵⁴Mn, ⁵⁷Co, and ⁵⁹Ni and their energy dependences were determined. The results are discussed and compared with available experimental data and with recommendations of model-based systematics.     

C59N和C19N晶体的合成

通过溶解C₆₀的CCl₄溶液在大气中的慢蒸发可以合成C₅₉N和C₁₉N晶体,这项实验结果为C_nN（n≤59）晶体研究开辟了一种简单而有效的途径. 关键词： 富勒烯晶体 飞行时间质谱 透射电子显微镜 X射线光电子能谱     

Homogenitätsuntersuchungen an neutronenaktivierten Eisen-Mangan-Mischoxiden durch Messung der γ-Strahlung des 59Fe

In neutronenaktivierten Eisen-Mangan-Mischoxiden, deren Komponenten in Mengen gleicher Gröβenordnung vorlagen, wurde von einer statistisch ausreichenden Probenzahl die γ-Strahlung des ⁵⁹Fe gemessen. Zur Beurteilung der Homogenität warden die Standardabweichungen der Meβreihen mit der des Meβverfahrens verglichen und die Zahl der Meβwerte, die auβerhalb des Streu-bereichs des Meβverfahrens lagen, bestimunt. Es konnte gezeigt werden, daβ Messungen dieser Art zur Homogenitätsprüfung gut geeignet sind.     

用于TI-59型计算器上的光学透镜初级象差系数的计算程序

便携式可编程序函数型TI-59型计算器是美国德克萨斯州仪器公司七十年代后期的TI系列产品。它的最大随机存储器容量为960个程序步或者为100个数据存储单元和160个程序步,并且可以按照使用者的需要自由地划分程序区和数据区,有175种科学、工程、统计计算的计算功能,可以调用计算器内装的25个通用程序中的任何几个作为自己编制程序中的子程序。编制好的程序可转录到磁     

钴超分子络合物中的氢键相互作用—59Co核磁共振研究及分子模拟

钴超分子络合物[12]aneN₄[Co(CN)₆], [18]aneN₆[Co(CN)_6^], [24] aneN₈[Co(CN)₆], [16] aneN₄[Co(CN)₆], [24] aneN₆[Co(CN)₆]以及[32] aneN₈[Co(CN)₆]中, 氢键相互作用的程度与它们在水溶液中的构象密切相关, 从而引起⁵⁹Co的化学位移向高场移动, 并且其四极矩耦合作用也随构象发生了变化. 实验证明, 络合物中的氢键越强, 化学位移越向高场移动, 四极矩耦合作用也越大. 另一方面, 尺寸大的超分子具有较长的分子转动相关时间,也导致⁵⁹Co具有较短的纵向弛豫时间. 简而言之,⁵⁹Co核磁共振不仅在小分子甚至在超分子络合物中都可以用作理想的探针研究分子的次层或弱相互作用.     

在椭偏测厚中用TI——59计算器直接计算薄膜厚度

当前一些非常薄的膜层被广泛地应用于各技术领域中。因此,精确地测量薄膜厚度是一种重要的物理测量技术。其中,椭圆偏振法这种测量方法,是通过光波反射时偏振状态变化进行的;它能测很薄的膜厚(可达20A以下),测量精度很高(理论上误差可小于±10A),在各种已有的测膜厚方法中,它是能测膜厚最薄和测量精度最高的一种。但由于长期存在着数学处理上的困难与局限性,只有依靠电子计算机的发展和应用才使椭圆偏振法获得了生命力。     

油滴实验的数据处理TI—59型计算器在近代物理实验中的应用

可编程序计算器的外形虽然仍与一般函数型计算器相类似,却能解算很多过去只有体积庞大的电子计算机才能解算的问题,与电子计算机相比,它有价格便宜、容易掌握、携带和使用方便等优点,它的功能完全可以满足实验物理工作者的需要。让物理系学生通过实验学会使用这类计算器,不仅能提高他们的实验效益,还可以学到不少有关计算机方面的知识。