霍尔元件线度对磁场测量影响的研究

在原有霍尔效应原理的基础上,利用微积分的基本方法和相关的物理知识推导非均匀磁场中利用霍尔效应测量磁场的理论公式,并结合该公式理论解释实验中对于霍尔元件线度的要求,以及说明非均匀磁场的测量对霍尔元件线度的要求,从而说明实验中经常遇到的一类问题——平均值问题。     

太阳能驱动全天候监控系统的实验设计

研发了一套太阳能全天候监控系统设计性实验。该实验通过对太阳能电池板基本物理性能的测定,了解其工作原理,然后选择合适的控制器件与负载,设计电路,最后形成一套由太阳能电池板提供能量,实现全天候监控的应用系统。该实验不仅能够作为设计性实验用于大学物理实验,而且可以应用于许多工程领域。     

High pressure X-ray diffraction study of CaMnO3 perovskite

Using a diamond anvil cell device and synchrotron radiation,the in-situ high-pressure structure of CaMnO3 has been investigated.In the pressure up to 36.5 GPa,no pressure-induced phase transition is observed.The pressure dependence on the lattice parameters of CaMnO3 is reported,and the relationship of the axial compression coefficients is βa >βc > βb.The isothermal bulk modulus K298=224(25)GPa is also obtained by fitting the pressure-volume data using the Murnaghan equation of state.     

内函数逼近定理及上溢原理的推广及应用

在κ-饱和的非标准模型中,首先推广了内函数逼近定理,并用这一推广定理证明了著名的A sco li定理;其次将上(下)溢原理推广到一般的定向集上,并证明了拓扑空间中单子的一些性质,给出了无穷小延伸定理的一个简单证明.     

基于Kullback信息融合方法的串联系统可靠性评估

讨论了串联系统在具有多源验前信息的情形下的可靠性评估问题,运用K u llback信息作为分布之间距离的度量,在K u llback信息的融合准则下对多个先验分布进行融合.并以融合后的先验分布作为系统的最终验前分布,对串联系统的可靠性指标进行Bayes估计.最后进行的计算机随机模拟结果表明,文中所提出的方法合理且便于应用.     

新型含苯并磷杂环戊二烯结构荧光分子的合成及性能

以三苯胺、咔唑为电子给体, 苯并磷杂环戊二烯氧化物为电子受体, 设计合成了一类新颖的D-A-D 型荧光分子, 其结构经¹H NMR, ¹³C NMR, ³¹P NMR, IR和MS确认。通过紫外可见吸收光谱和荧光光谱系统研究了不同给体和受体单元对荧光分子的紫外吸收、液体荧光、固体荧光、溶致变色及聚集诱导发光等光物理性能的影响。结果表明：合成的三种分子具有良好的液体和固体荧光性能;化合物TBN-EPIO具有显著的溶致变色效应, 在四氢呋喃-水二元溶剂体系中, 具有聚集诱导发光(AIE)效应。此外, 利用密度泛函理论计算了分子的几何构型及前线分子轨道电子云。      

从(-)-莽草酸出发合成(3R,5R)-3,4,5-三苯甲酰氧基环己酮

报道了一种合成手性中间体(3R,5R)-3,4,5-三羟基环己酮的新方法。首次以(-)-莽草酸为起始原料,经苯甲酰化、双键氢化、选择性还原甲酯、羟基碘代、碘代烃消除、双键双羟化、片哪醇断裂等步骤,以44.9%的总收率合成了(3R,5R)-3,4,5-三苯甲酰氧基环己酮,所有化合物的结构经¹H NMR、 ¹³C NMR、 IR及MS等确证。      

An Efficient Scheme for Multiparty Multi-particle State Sharing

We present an efficient scheme for sharing an arbitrary m-qubit state with n agents. In our scheme, the sender Alice first shares m Bell states with the agent Bob, who is designated to recover the original m-qubit state. Furthermore, Alice introduces n- 1 auxiliary particles in the initial state ｜0）, applies Hadamard （H） gate and Controlled-Not （CNOT） gate operations on the particles, which make them entangled with one of m particle pairs in Bell states, and then sends them to the controllers （i.e., other n - 1 agents）, where each controller only holds one particle in hand. After Alice performing m Bell-basis measurements and each controller a single-particle measurement, the recover Bob can obtain the original unknown quantum state by applying the corresponding local unitary operations on his particles. Its intrinsic efficiency for qubits approaches 100%, and the total efficiency really approaches the maximal value.     

Primary result of ^236U measurement with accelerator mass spectrometry at CIAE

The rare isotope ^236U has a half-life of 2.342（3）×107 years, and is produced principally by thermal neutron capture on ^235U. The isotopic atom ratio of ^236U/^238U depends on the integral thermal neutron flux received by the material of interest. ^236U is potentially useful as a ＂fingerprint＂ for indicating the presence of neutron-irradiated uranium usually originating from nuclear activity. By extracting negative molecular ion UO^- from the uranium oxide target, simulating the ^236U^16O^- beam transport with ^238U^16O^- and ^208Pb2^16O^- pilot molecular ion beam, transporting the ^236U-containing ion beam with a high resolution injection magnet analyzer and electrostatic analyzer system, and finally identifying and detecting ^236U with a time-of-flight detector （TOF）, a method for AMS （Accelerator Mass Spectrometry） measurement of ^236U was established on the HI-13 Accelerator AMS system at China Institute of Atomic Energy.     

Primary result of ~(236)U measurement with accelerator mass spectrometry at CIAE

The rare isotope 236U has a half-life of 2.342(3)×107 years,and is produced principally by thermal neutron capture on 235U.The isotopic atom ratio of 236U/238U depends on the integral thermal neutron flux received by the material of interest.236U is potentially useful as a fingerprint for indicating the presence of neutron-irradiated uranium usually originating from nuclear activity.By extracting negative molecular ion UO- from the uranium oxide target,simulating the 236U16O- beam transport with 238U16O- an...