BIOLOGICAL EFFECT OF THE RABBIT LIVER IRRADIATED WITH FOCOUSED ULTRASOUND IN VIVO——HISTOCHEMICAL CHANGES

Rabbits'livers were irradiated by focused ultrasond with intensity of 30 W/cm~2,at the frequency of 1.06MHz,for 3 mins directly.The treated animals were sacrificed in 1 day,3 days,7 days,1 month and 2 monthsafer irradiation.Then the irradiated area of the liver was cut off and studied with routine histological H.E.method and some histochemical techniques,including the demonstration of adnosine triphospbatase(ATPase),thiamin pyrophosphatase(TPPase),nonspecific esterase(NSEase),succinate dehydrogenase(SDHase)and glycogen.The histological and histochemical changes in this experiment are as follows:(1)TheCavitational vesicles produced in the cytoplasm of light lesion hepatic cell squeeze the nucleus to the margin ofthe cell and extend the contour of hepatic cell to a ball-shape.All the ball-shape cells in the hepatic corddecrease their contact surface and are apt to be separated from one another.(2)The activities of ATPase,TTPase,NSEase and SDHase in the heavy lesion cells decrease vigorously,or even no acti     

LSB隐写术的密钥恢复方法

作为隐写术安全性分析的重要手段,隐写分析已成为信息隐藏领域的一个研究热点.而通过恢复隐写密钥来提取隐藏的消息是隐写分析的主要目的之一.为了研究如何搜索隐写密钥,首先在"已知载体"和"载体被重复使用"条件下,分析了恢复LSB隐写术密钥的计算复杂度.然后在"载体被重复使用"条件下,对图像空域LSB隐写术提出了一种新的密钥恢复算法.该算法借鉴了密码分析中的"分别征服攻击"思想,使计算复杂度由O(2 (2r))降至O(2 r).实验结果表明了该算法的有效性.     

m值逻辑函数的谱分解式及广义Bent函数的递归构造

本文用概率方法得到ｍ值逻辑函数Ｃｈｒｅｓｔｅｎｓｏｎ循环谱的分解式,据此考察了ｍ值广义Ｂｅｎｔ函数一些新的性质,给出了递归构造ｍ（ｍ≠２ｍｏｄ４）值广义Ｂｅｎｔ函数的一般方法．     

脉冲激光沉积镀膜实验虚拟仿真教学的设计与实践

薄膜制备是“实施好产业基础再造工程,打牢基础零部件”的重要基础工艺。但因薄膜制备技术存在的先进性和复杂性,给该技术的实验教学带来困扰。该文针对这一难题,采用虚拟仿真技术,创设教学情境、融入教学氛围、兼顾实验开放共享,结合“能实不虚、虚实结合、优化资源和规范流程”的原则,设计了脉冲激光沉积镀膜虚拟实验系统。该系统注重培养学生的自主学习能力,培养学生养成源头控制、过程管理和末端处理的工程实践能力。     

武警边防院校军事体能训练的现状与对策

通过对武警边防院校军事体能训练的现状进行深入分析,探究军事体能训练中存在的问题。针对边防院校军事体能训练的现实情况,笔者从完善体能课程设置,丰富教学手段,科学制定评价标准,建立协作机制等方面提出解决对策。     

Adaptive synchronization of chaos in permanent magnet synchronous motors based on passivity theory

An adaptive synchronization control method is proposed for chaotic permanent magnet synchronous motors based on the property of a passive system.We prove that the controller makes the synchronization error system between the driving and the response systems not only passive but also asymptotically stable.The simulation results show that the proposed method is effective and robust against uncertainties in the systemic parameters.     

广义部分Bent函数和广义Bent函数的关系

Bent函数是一类特殊的布尔函数,因其非线性性和稳定性在密码学和通信等领域有很重要的应用,但它们数量少,不平衡且无相关免疫性,为了弥补Bent函数的不足,Claud Carlet提出了部分Bent函数的概念,部分Bent函数是包含Bent函数的更大的函数类,后来,人们又将这两种函数概念先后都拓广到了环zm^n(m为正整数）上,分别被称为zm^n上的广义Bent函数和广义部分Bent函数,本文利用zp^n(p为素数）上广义部分Bent函数的Chrestenson循环谱特征讨论了zp^n上的广义部分Bent函数和广义Bent函数之间的关系,给出了这两种函数之间的函数关系式和谱值关系式。     

三维气固两相混合层湍流拟序结构的直接数值模拟

本文对三维气固两相混合层湍流拟序结构进行了直接数值模拟。气相流场应用拟谱方法对Ｎ－Ｓ方程组进行直接求解,通过模拟时间模式的混合层流动,分析流场失稳后涡的卷起、配对、合并及撕裂过程,研究三维混合层湍流拟序结构的演变特征;计算颗粒场时,采用Ｌａｇｒａｎｇｉａｎ方法,针对颗粒不同的Ｓｔｏｋｅｓ数,模拟了颗粒场的瞬态分布,并分析流场三维大涡结构对颗粒分布的影响。     

Adaptive synchronization of chaos in permanent magnet synchronous motors based on passivity theory

An adaptive synchronization control method is proposed for chaotic permanent magnet synchronous motors based on the property of a passive system. We prove that the controller makes the synchronization error system between the driving and the response systems not only passive but also asymptotically stable. The simulation results show that the proposed method is effective and robust against uncertainties in the systemic parameters.     

烧结机尾断面图象的特片提取

通过对带式烧结机烧结过程变化与机尾断面象之间关系的分析，撮了断面图象的一次特征，并确立了基于过程机理的一次特征提取方法，在此基础上又进行了二次特征提取，所提取的二次特征能够从４个方面对烧结过程进行定量描述。