Measurements of the light output functions of plastic scintillator using 9Be(d,n)10B reaction neutron source

The light output functions for protons of ST-401 and BC-408 plastic scintillators were measured using white neutron source produced by the 9Be(d,n)10B reaction at the HI-13 Tandem Accelerator at China Institute of Atomic Energy(CIAE).The LOFs of plastic scintillators for protons in the energy range of 0.516.5 MeV were obtained by the time-of-flight(TOF)technique and an iterative procedure.Two parameters(kB and C)were deduced by fitting the experimental data.     

Tensor representation in teleportation and controlled teleportation

We propose the tensor representation of teleportation and controlled teleportation. By using this representation, it is easy to describe the process of teleporting an unknown N-qubit state via a genuine 2N-qubit channel, and to find the necessary and sufficient condition of realizing a successful teleportation (which is determined by the measurement matrix T^α and the quantum channel parameter matrix X). For controlled teleportation, if composing tensor representation with graph, one can easily design any kind of controlled teleportation. As examples, we give a scheme of symmetrically controlled teleportation of two-qubit states and a scheme of representative network controlled of three-qubit states. This method can also be generalized to the controlled teleportation of N-qubit states.     

声发射辅以模糊神经网络的质量检测

利用铸铁工件在加载与卸载时所产生的声发射信号作为神经网络模式识别的输入特征，并对网络输入量与输出量进行模糊化隶属度计算，用最陡下降的BP学习法对连接权重系数进行优化，成功地实现了对铸铁工件样本组的训练和分类。     

狭缝式高灵敏裂变中子探测系统

研制了狭缝-外延式高灵敏大面积PIN裂变中子探测系统. 其对14MeV，2.5MeV中子灵敏度可达10^-16C·cm²，比原有典型的脉冲裂变中子探测系统高4个量级. 采用外延式铅狭缝准直结构，研制灵敏区尺寸为60mm，厚度为200μm—300μm的大面积PIN半导体探测器、以Be膜为衬底，有效直径为60的²³⁵U裂变靶，解决了该探测器研制中的高灵敏度和n/γ分辨难题. 该系统已在实践中获得成功应用. 关键词： 裂变中子探测系统 大面积PIN探测器 大面积裂变靶 高灵敏探测系统     

Etching blazed grating into quartz substrate with selectivity 1:1 against photoresist by inductively coupled plasma technology

Inductively coupled plasma (ICP) etching technology is becoming widely used in the fabrication of micro-optical elements. Because of its advantages such as relatively high etching rate and anisotropic etching, ICP technology is receiving more attention. Selectivity 1:1 of the substrate against photoresist is very convenient, because we can easily get the same structures which were designed on the photoresist. Through extensive experiments we have achieved an optimized etching condition under which the transfer process generates fairly smooth etched structures with selectivity 1:1. The first order diffraction efficiency of the etched blazed gratings is 83.5% which is a little bit lower than the theoretical efficiency 88.9%. The diffraction of etched blazed gratings matches the theoretical results well.     

Evolutionary mechanism of safety performance for spur gear pair based on meshing safety domain

Nonlinear Dynamics - Micro-vibrations in satellites mainly originate from the control moment gyroscope because of its mass imbalance, which seriously affect the image accuracy of high-resolution...     

SrFeCo0.5O3.25+δ粉体的合成和透氧膜的制备及其性能研究

采用甘氨酸－硝酸盐法合成Ｓｒ－Ｃｏ－Ｆｅ复合氧化物超细粉体,用以制备组成为ＳｒＦｅＣｏ０．５Ｏ３。２５＋δ（ＳＦＣ）致密透氧陶瓷膜,结果表明粉体分散性和烧结性能好,残碳量可忽略,组成符合给定的化学计量比。对ＳｒＦｅＣ０．５Ｏ３．２５＋δ陶瓷膜材料进行了相结构、微结构、电导和氧渗透性能的研究,所获得的ＳＦＣ透氧膜材料有较高的氧渗透率,并与传统的固相反应法制得的样品进行了比较。