The torsion model of soft tissue in virtual surgery

In order to solve the problem of real-time soft tissue torsion simulation in virtual surgeries,a torsion model based on coil spring is proposed to actualize real-time interactions and applications in virtual surgeries. The proposed model is composed of several connected coil springs in series. The sum of torsion deformation on every coil is equivalent to the soft tissue surface deformation. The calculation of the model is simple because the method for calculating the torsion deformation for each coil spring is the same. The virtual surgery simulation system is established on PHANTOM OMNI haptic device based on the Open GL 3 D graphic interface and VC + + software,and it is used to simulate the torsion deformation of virtual legs and arms. Experimental results show that the proposed model can effectively simulate the torsion deformation of soft tissue while being of real-time performance and simplicity,which can well meet requirements of virtual operation simulations.     

反计算机取证技术研究

分析了反计算机取证的基本概念和方法,比较了反计算机取证所采用的数据擦除、数据加密、数据隐藏、数据混淆和数据转换等主要技术,并提出了一种安全、高效的基于m序列的数据擦除方法.     

Fluorescence spectra and enzymatic property of hemoglobin as mimetic peroxidase

0　IntroductionHemoglobin(Hb)isthemajorhemeproteinofredbloodcells(RBCs)andisresponsibleforthetransportofoxygentothetissues.ThefunctionofHbdependsupontheabilityoffer rousironinthehemegrouptobindandreleaseoxygen .Despiteitsprincipalroleasanoxygen carrier,theHbmoleculepossessesdifferentenzymaticactivities[1 ] andamethodwasdevelopedforthedeterminationofHbbasedonitsenzymaticactivityfortheox idationofo phenylenediamine (OPDA)withH2 O2 asanoxi dant[2 ] .Hbasamimeticenzymeofperoxidase ,cancataly…     

论超穷过程论中的两个基本原理与HEGEL的消极无限批判

引言本文的著者之一在不久以前曾经发表了一篇概念分析性质的文章(载1956年东北人大自然科学学报第一期).在那篇文章中,著者揭示了一个新的理论,即所谓从超穷过程的构成观点来研究无穷集合的形成方式,进而从新考察了Cantor经典超穷数论中几个带有根本性质的问题,并从新叙述了若干极其基本重要的命题.所说到的新理论,我们称之为‘超穷过程论’.如所知,这个理论是以两个基     

Relationship between Low Temperature Toughness and Microstructure in Low Activation Fe-Cr-Mn (W,V) Steel for Fusion Reactors

Fe-Cr-Mn (W, V) austenite steel was researched in order to supply a theory base for the first wall materials of fusion reactors.Experiments included vacuum melting, forging, annealing, solution treatment, Charpy impact tests and microstructure observation. The results show that the imped value decreases with the test temperature decreasing. In this system, there is ductile/brittle transition. The mechanism of this decrease of the impact value is considered to be due to γ→ε transformation in sub-stable austenite steel and stopping overlapping sacking fault by grain boundaries in stable austenite steel.     

Reaction Sintering of Fe-Al Powder Mechanically Activated

The mixture of Fe and Al powder was mechanically activated and sintered to study a non-melting method of producing the intermetallics Fe₃Al. High-energy ball milling was used as an activation method, X-ray diffraction and SEM were chosen to analyze the materials variation before and after activation and sintering, and hot press of Fe-Al powder was inveshgated to compare mechanical activation with sintering. The results show that combining mechanical activation with reaction sintering can complete the transformation from pure Fe and Al powder to intermetallics. It is difficult to do the transformation by either mechanical activation or hot press.     

基于EEMD和SVM的冷轧机垂直振动相关故障的诊断

通过对冷板带轧机垂直振动过程的机理进行分析,结合轧机系统结构模型,建立含振动因素的冷轧机垂向系统动态轧制力模型.考虑复杂工况下,轧机在生产不同规格带钢时,由工艺参数波动等广义故障所致轧机垂直振动现象,基于工业现场数据进行数据驱动的故障诊断算法研究.采用集成经验模态分解算法对实测轧制力信号进行分解,选取有效的固有模态函数的能量作为特征向量,并将其输入到支持向量机分类器中,通过分类器对正常状态和故障状态进行区分,以实现轧机振动相关故障的准确诊断.     

数学哲学在数学教育中的应用

在历史上,数学哲学对数学教育很少有直接影响,而现在,数学哲学的研究,已被置身于数学与社会相互作用的广阔背景上,因而若再不重视和探求数学哲学在数学教育中的应用,则将得不到社会需求所提供的发展动力。另一方面,本世纪30年代以后,关于数学基础的探索和研究,也为数学哲学在数学教育中的应用创造了条件,本文从理论上探讨了数学哲学在数学教育中的应用的途径与方法。