Application of ultrasound in preparing pathological sections to reduce processing time

It has been found experimentally that application of sub-mega and low megahertz ultrasound (US) of spatial and temporal averaged intensity I_sata up to 10 W/cm² during the process of preparing pathological sections of the mouse tissue has shortened the processing time from 12 h (without US) to less than half an hour (with US). The experiment has also showed that the processing time reached the shortest for ultrasound f = 200 kHz among the frequencies of 200 kHz, 400 kHz, 600 kHz, 800 kHz and 1 MHz used in this study. It has been proposed that ultrasound inducing non-inertial cavitation enhanced the permeability of cell membrane to liquid. Thus tissue fixation and dehydration were speeded up by application of US.     

快速制取人体组织病理切片的超声波法

本文介绍了用超声波方法快速制妈人体组织病理切片的基本原理，实验步骤和试验结果。结果表明，用超声波处理后快速制取的病理切片完全怀可常规石蜡切片相媲美，在临床外检快速病理诊断应用上，超声处理仪有可能取代价格昂贵的恒温式冷冻切片机。     

A novel and environment-friendly method for preparing dihydropyrano[2,3-c]pyrazoles in water under ultrasound irradiation

A green and convenient approach to the synthesis of dihydropyrano[2,3-c]pyrazoles via four-component reaction of aromatic aldehydes, hydrazine, ethyl acetoacetate and malononitrile in water under ultrasound irradiation is described. This method provides several advantages such as environmental friendliness, shorter reaction time, excellent yields, and simple workup procedure.     

一种新的激光光斑参数快速计算方法

提出了一种利用弦的特性快速提取激光光斑参数的二维Hough变换方法。基本步骤是在圆形光斑边缘图像上作两条交于边缘上一点且相互垂直并分别平行于坐标轴的弦,通过这两条弦与光斑圆心及半径的几何关系,求取光斑的中心坐标和半径。遍历所有边缘点,对参数空间二维中心坐标数组投票,最大值对应参数即为光斑中心坐标。分析一维归一化半径直方图,求得光斑半径。实验结果表明,与传统的Hough变换相比,该算法在运行时间和空间效率上都有很大提高,具有更强的实用意义及应用前景。     

Artificial ultrasound anisotropy of crystals in the range of X-ray frequencies

Phenomenon of artificial ultrasound anisotropy is revealed in crystals in the range of X-ray frequencies and an attempt is made to explain this effect theoretically for the case of the Bragg-Laue diffraction. It is established that an isotropic crystal becomes, under action of ultrasound, optically anisotropic like a uniaxial crystal with the optical axis along the direction of the external action; this axis is the symmetry axis and causes birefringence.     

一种快速的图像边缘精确提取算法

图像边缘检测是图像处理与分析中最基础的内容之一。现有的边缘检测算法存在检测精度低、抗噪性能差、处理速度慢等缺点。针对这些问题,提出了一种快速图像边缘检测算法。通过基于图像边缘信息的阈值分割,能快速地提取出图像的边缘轮廓,通过对其进行中心细化,可达到对物体边缘精确定位的目的。仿真实验证明,该算法在滤除图像噪声、保留细节边缘、细化边缘宽度和保持边缘连通性方面都获得了不错的效果,并且运算量小,既适用于对视频图像的实时处理,也适用于对图像中的隐蔽目标特征的提取和分析。     

One-step method for preparing the experimental pure state in nuclear magnetic resonance

Quantum computing is an emerging and promising research field in modern quantum physics and is committed to accelerating traditional calculation processes using the principle of quantum mechanics[1,2].Several computation models have been proposed,including the circuit model[3],topologic quantum computation[4],adiabatic quantum computing[5],and duality quantum computing[6-8].Universal quantum computation generally includes a system initialization,evolutionary control,and a final-state readout[9],where the preparation of the initial state is a key step in the entire process.     

Numerical method for external Bremsstrahlung cross sections in compounds

A numerical method is used to evaluate External Bremsstrahlung (EB) cross section in compounds such as NaI, SiLi, and GeLi first time using tabulated data given for elements. Modified atomic number defined for compound is used to evaluate cross section. This evaluated theoretical data may be useful for the analysis of experimental spectrum and yield of EB in thick target compounds.     

Group representations and the method of sections

The unitary representations of the Euclidean and Poincaré groups are analysed, using viewpoints suggested by the method of sections, as applied to the monopole problem, and by the method of induced representations.