基于模糊层次分析法的计算机网络安全评价

根据计算机网络的特点及网络安全涉及的因素,建立计算机网络安全评价的层次结构模型,运用基于三角模糊数的模糊层次分析法实现对网络安全的综合量化评价。实例的计算结果表明模糊层次分析法适用于定性判断的量化综合,它为计算机网络安全评价提供了一种探索性方法。     

Feature detection of triangular meshes based on tensor voting theory

This paper presents n-dimensional feature recognition of triangular meshes that can handle both geometric properties and additional attributes such as color information of a physical object. Our method is based on a tensor voting technique for classifying features and integrates a clustering and region growing methodology for segmenting a mesh into sub-patches. We classify a feature into a corner, a sharp edge and a face. Then, finally we detect features via region merging and cleaning processes. Our feature detection shows good performance with efficiency for various dimensional models.     

Ternary butterfly subdivision

This paper presents an interpolating ternary butterfly subdivision scheme for triangular meshes based on a 1–9 splitting operator. The regular rules are derived from a C² interpolating subdivision curve, and the irregular rules are established through the Fourier analysis of the regular case. By analyzing the eigenstructures and characteristic maps, we show that the subdivision surfaces generated by this scheme is C¹ continuous up to valence 100. In addition, the curvature of regular region is bounded. Finally we demonstrate the visual quality of our subdivision scheme with several examples.     

Incompressible Navier–Stokes solutions by a triangular spectral/p element projection method

The application of the fractional step projection method recently proposed by Guermond and Quartapelle to the numerical approximation of unsteady Navier–Stokes solutions by means of a spectral/p element method is considered. In particular we illustrate the second-order pressure correction technique and evaluate its accuracy properties in some test cases. Stability with respect to the compatibility condition between the approximation spaces for velocity and pressure is also addressed. The high (spectral) accuracy in space and the second-order accuracy in time are verified by two simple test cases with analytical solution. A more interesting problem is solved showing the ability of the method to produce very accurate results also for problems in complex geometries.     

夏热冬冷地区混凝土保温砌块建筑研究与应用

对夏热冬冷地区混凝土复合保温砌块用于屋面和外围护墙中的保温隔热效果进行了分析,结果表明该复合保温砌块围护结构各项热工性能指标均符合地方节能标准,能有效提高室内舒适度,节能效果显著.     

Synthesis of CdS nanoplates by PAA-assisted hydrothermal approach

Triangular and hexagonal CdS nanoplates, with average size about 100 nm and average thickness range from 10 to 30 nm, have been synthesized in the presence of poly (acrylic acid) (PAA) assisted hydrothermal process at 180 °C. The structural characteristics, morphology, and optical properties of the as-prepared CdS products were investigated. UV–vis spectroscopy measurement reveals that the products show a strong quantum size effect. Based on the experiment results, the possible formation mechanism of CdS nanoplates has been proposed.     

“重生意识”与中国传统建筑文化

中华民族因特殊的地理环境和长期历史积淀,形成了以“重生意识”为主体的民族性格特征,这种独特的民族性格对中国传统建筑的形成与发展产生了深刻的影响。文章通过对国家、风水、城市和院落的空间模式特性的探讨,指出其共同的特性—围合,并将不同层面上的空间模式纳入一个统一的框架,总结出“重生意识”下中国传统建筑空间图式—多重围合。同时,将物质建设活动延伸到社会文化层面,试图找出中国传统建筑空间模式与民族性格的内在关联。     

建筑室内环境的数值模拟研究

采用华北地区采暖期间典型计算日内的逐时气温,将计算范围扩至建筑墙体外表面,所建的物理模型和各种材料的物理性质都与实际相符。通过数值计算方法,将建筑围护结构表面换热过程视为一个动态系统,大大提高了精度,为建筑热工分析和采暖负荷计算提供了可行和准确的计算方法。     

QBZ18系列矿用隔爆兼本安型真空电磁起动器

针对起动器产品存在的问题，对原BQD系列起动器产品进行了升级改造，采用快开门结构、真空电器、数字式电机综合保护等技术改造措施后，新系列起动器产品工作电压为1140V，亦可用于660V及380V供电系统，具有更加全面的保护功能；主电路的负载能力和控制电路的准确性、可靠性均有很大提高。进一步满足了煤矿井下控制和监控的需要，同时也解决了起动器规格不全引起的使用不合理问题。     

A Type of Triangular Ball Surface and its Properties

1IntroductionIntheCONSURFsystemll--3]developedbyA.A.Ball,thebasisfunctionsforcubicpolynomialsweredefinedbyandhencecubicBallcurveswithcontrolpointsPi(i=0,1,2,3)canberepresentedasp(u)=Z?=.B!(u)Pi,0Su51.TwotypesofhigherdegreegeneralizedBallbasisfunctionsandcorrespondingcurveshavebeenderivedbyWangl4]andSaidls]independently.InWang'spaper,generalizedBailbasisfunctionsofarbitrarydegreeweredefinedasfollows'.ifnisanevennumber.ifnisanoddnumberwherew~2u(1--u),05u51.Aparametriccurveofdegreentcall…