共查询到20条相似文献，搜索用时 468 毫秒
1.
Abstract： An innovative occupant friendly retrofitting technique has been developed for reinforced concrete （RC） building structures with hollow brick infill wails used as partition walls which constitute the major portion of the existing building stock in Turkey. The idea is to convert the existing hollow brick infill wall into a load carrying system acting as a cast-in-place RC wall by reinforcing it with relatively thin concrete plates bonded to the mortar coated infill wall by use of tile adhesive and fixed by qb6 （6 mm diameter） bolts. Test parameters were the shape and thickness of the plates, presence of reinforcement in plates, number and arrangement of O6 bolts. It was observed that lateral strength, stiffness, energy dissipation capacity, and ductility of the strengthened infill walls were improved and behaviour was enhanced by the proposed technique. Plates with two different basic shapes were used to strengthen the test specimens. 相似文献
2.
WANG Cheng-gang MO Zhi-hong 《重庆大学学报(英文版)》2007,6(3):151-154
A GoBlast system was built to predict gene function by integrating Blast search and Gene Ontology (GO) annotations together. The operation system was based on Debian Linux 3.1, with Apache as the web server and Mysql database as the data storage system. FASTA files with GO annotations were taken as the sequence source for blast alignment, which were formatted by wu-formatdb program. The GoBlast system includes three Bioperl modules in Perl:a data input module, a data process module and a data output module. A GoBlast query starts with an amino acid or nucleotide sequence. It ends with an output in an html page, presenting high scoring gene products which are of a high homology to the queried sequence and listing associated GO terms beside respective gene poducts. A simple click on a GO term leads to the detailed explanation of the specific gene function. This avails gene function prediction by Blast. GoBlast can be a very useful tool for functional genome research and is available for free at http://bioq.org/goblast. 相似文献
3.
The increase of frame rate, though with the potential in a coded ultrasound system, is generally concomitant with the simultaneous transmission of a number of apertures, and in consequence leads to increased cross-talks between different apertures. In view of this, a new coding scheme using staggering repetition interval was proposed. The transmitting signals were constructed by repeating the two （or more） modulated codes using staggering repetition interval, and then allocated to and transmitted simultaneously among different apertures. The decoding process was based on the subsection-matched filter under the assistance of different matched filters for different apertures. At last the outputs of subsection-matched filtering were added together. Staggering changed the positions of cross-correlation （CC） peaks from coinciding, which resulted in an effective reduction of CC. Our theoretical analysis and simulations showed that, the coding scheme can be used to reduce cross-talk, and a good cross-talk reduction will be achieved if the staggering delay is kept in an appropriate range. 相似文献
4.
Counter beam lighting was introduced as well as transverse symmetrical lighting and longitudinal symmetrical lighting. Simulation experiments were carried out by using DIAlux lighting software for the above three lighting methods. The results show that counter beam lighting is more reasonable to be adopted in the tunnel entrance zone because its threshold increment of disability glare is greater. Counter beam lighting can improve the background luminance of the obstacles and lighting efficiency compared with transverse symmetrical lighting and longitudinal symmetrical lighting. Therefore, tunnel lighting energy-saving can be achieved by reducing the road luminance demands and luminaries power. Longitudinal symmetrical lighting is conducive to the large luminaries spacing in the tunnel internal zone; so power consumption can be reduced by decreasing the number of luminaries used. Tunnel walls are unsuitable to pave with smooth or bright material. Installation height of the luminaries has less effect on counter beam lighting. 相似文献
5.
A Method for Reducing Noise Radiated from Structures with Vibration Absorbers by Using an Accelerated Neural Network 总被引：2，自引：0，他引：2
A method for reducing noise radiated from structures by vibration absorbers is presented. Since usual design method for the absorbers is invalid for noise reduction, the peaks of noise power in the frequency domain as cost functions are applied. Hence, the equations for obtaining optimal parameters of the absorbers become nonlinear expressions. To have the parameters, an accelerated neural network procedure has been presented.Numerical calculations have been carried out for a plate-type cantilever beam with a large width, and experimental tests have been also performed for the same beam. It is clarified that the present method is valid for reducing noise radiated from structures. As for the usual design method for the absorbers, model analysis has been given, so the number of absorbers should be the same as that of the considered modes. While the nonlinear problem can be dealt with by the present method, there is no restriction on the number of absorbers or the model number. 相似文献
6.
Naziha Ahmad Azli Mohd Shahizan Othman 《美中教育评论》2008,5(3):16-23
The Faculty of Electrical Engineering, University Technology Malaysia is currently moving towards a Problem-Based Laboratory implementation rather than the conventional instructional-based laboratory for final year students. The laboratory has commenced session with about 500 students＇ registration in the 2007/08/1. The Problem-Based Laboratory requires each group of four or five students to solve three given problems in three different laboratories per semester. Each problem has to be solved by conducting the related experiment within four weeks. As they are various evaluation criteria that need to be considered, a web-based evaluation system is proposed in determining the final grade of the students. The evaluation system allows the laboratory coordinators to log in as administrators in order to monitor the evaluation process, which involves both the laboratory technicians and students. The developed web-based evaluation system has proven its capability in working interactively with the users. From the uploading of student＇s information, group division, marks insertion and total marks calculation for the final grade. It is anticipated that the web-based evaluation system can ensure reliability and security in determining a student＇s grade in a Problem-Based Laboratory in a shorter time especially when dealing with a large number of students. 相似文献
7.
We used computational fluid dynamics （CFD） and mode superposition method instead of the energy balance method to compute transmission line aeolian vibrations induced by the Karman vortex. Firstly, we obtained the wind power inputs using CFD theory. The result is effective for aeolian vibration analyses compared with the power which were measured in wind tunnel tests. Then a new aeolian excitation was derived using the wind power equivalent principle, and the aeolian vibration distribution along transmission lines and the wind power input obtained by CFD can be account. Secondly, we formulated the motion equation of a conductor-damper system and derived a semi-analytial solution using the mode superposition method. The Stockbridge-type dampers attached were simplified to the forces transmitted by the clamps. Finally, the semi-analytical solution can be solved by iterative methods. Taking a 1 000 kV Ultra High Voltage transmission line as an example, we analyzed the line with and without dampers by the semi-analytical solution. Compared with the results which were computed by the energy balance method, the semi-analytical solution is precise enogh for aeolian vibration analyses. Besides, we also analyzed the influence of damper position and quantity. 相似文献
8.
A power system with proton exchange membrane fuel cells (PEMFC) was designed for thermal underwater glider.Heat generated by PEMFC is used as the propulsion power of the glider,and the electricity is used in the control and sensor system.An electric energy storage system (ESS) is required which possesses high power density with good cycle life.Ultracapacitors which exhibit high power density and cycle life are considered as energy storage devices.Simulations based on a specific voyage condition indicate that ESS with ultracapacitors has positive effects on reducing the output power demand of PEMFC and lightening the power system.Experimental results show that the state of charge (SOC) is related to the capacitance and resistance in ultracapacitor ESS. 相似文献
9.
A method is proposed to monitor and control Hopf bifurcations in multi-machine power systems using the information from wide area measurement systems （WAMSs）. The power method （PM） is adopted to compute the pair of conjugate eigenvalues with the algebraically largest real part and the corresponding eigenvectors of the Jacobian matrix of a power system. The distance between the current equilibrium point and the Hopf bifurcation set can be monitored dynamically by computing the pair of conjugate eigenvalues. When the current equilibrium point is close to the Hopf bifurcation set, the approximate normal vector to the Hopf bifurcation set is computed and used as a direction to regulate control parameters to avoid a Hopf bifurcation in the power system described by differential algebraic equations （DAEs）. The validity of the proposed method is demonstrated by regulating the reactive power loads in a 14-bus power system. 相似文献
10.
A practical method for computing the one-way rectangular orthotropicplate(isotropic plate as a special case)is suggested in this paper.The supported condi-tions in two opposite edges may be simply supported,continuous or supportednonsymmetrically and the other two opposite edges are slide-supported or free.A series ofsimplified formulas are given for calculating the bending moments along the cross section(loaded section),in which the acting point of the concentrated load or the center of a rec-tangular uniform load is located.The valid range and accuracy of these formulas were stud-ied and the approximate results were examined and compared extensively with those by thetriangular series solution or finite element method. 相似文献
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令γ（G）表示一个图G的控制数,G×H表示图G和图H的笛卡尔乘积．现已有很多控制数的研究文章,参考已有控制数知识及笛卡尔乘积图Cm×Cn,Pm×Pn的控制数的相关结论,利用γ（Cm×Cn）≤γ（Pm×Cn）≤γ（Pm×Pn）这一不等式给出路与圈的笛卡尔乘积图Cm×Pn（m=2,3,4）,Pm×Cn（m=2,3,4）的控制数． 相似文献
13.
几乎正则图的全符号控制 总被引：1，自引：2，他引：1
1IntroductionFor notation and graph theory terminology we ingeneral follow[1].LetG=(V,E)be a graph with thevertex setVand the edge setE,andletvbe a vertexinV.The open neighborhood ofvisN(v)={u∈V|uv∈E}and the closed neighborhood ofvisN[v]={v}∪N(v).The d… 相似文献
14.
在n阶轮图Wn=O1+Cn的轮圈Cn上每相邻两点之间都加入一个顶点所构成的图称为齿轮图,记为n.给出了齿轮图n的点色数、边色数和全色数,研究了齿轮图n当参数r,s,t满足一定件时的[r,s,t]-色数. 相似文献
15.
主要考虑简单图,其特征值定义为它的邻接矩阵的特征值.在所有给定阶数且支配数为2的连通图中,完全刻画了最小特征值达到极小的图. 相似文献
16.
张东翰 《商洛师范专科学校学报》2009,(6):12-14
图的染色是图论的主要内容之一,它在通讯线路的设计,算法设计与分析以及理论计算机等方面有广泛的应用。如何确定一种图染色法的色数大小,是图染色研究的主要问题。概率方法是一种研究图染色的新方法,它主要用来估计图染色法的色数的上界。利用概率方法研究了图的邻点强可区别的全染色,得到了图的邻点强可区别的全染色的一个上界。 相似文献
17.
若图G的顶点可以用一个关于不同整数的标号函数f给出,使得对于G的任意两个不同的顶点u 和v,uv 是G 的边当且仅当f(u) + f(v) =f(w),w为G 的某个顶点,则图G称为整和图(integral sum graph).现给出完全三部图K1,1,r r≥3的(整)和数、完全三部图K1,r,r r≥2(整)和数的一个上下界,并证明了扇图 Fn 及任意个扇图在中心处相交构成的图是整和图,同时得到荷兰风车Dn 也是整和图. 相似文献
18.
合理有效地管理实验设备有利于提高设备的利用率,现将时间图查询用于实验设备的管理,可以丰富查询的语义,提高设备的查询效率。将设备的使用情况抽象成一个大的时间图,将用户的查询请求转换为一个查询图,利用图匹配技术查询出相关的结果。为实现查询图的匹配,提出了3种相关算法:朴素匹配算法(NM)、基于BFS的点匹配算法(BVM)和拓扑剪枝匹配算法(TPM)。在TPM算法中设计了2种索引:TV-索引和TE-索引,分别用于快速定位节点和边上的关系,并从结构和语义两个角度对匹配过程进行了剪枝。最后,设计了对比实验,通过实验验证了3种算法的性能。 相似文献
19.
设G=(V,E)是一个非空图,一个函数f:E→{-1,1},如果满足∑e’∈N[e]f(e’)≥1对于每一条边e∈E(G)均成立,则称f为图G的一个符号边控制函数。图G的符号边控制数记为r’s(G),定义为r’s(G)=min{∑e∈E(G)f(e)︱f}为G的一个符号边控制函数。全文对图的符号边控制函数进行了研究,得到了图的符号边控制数的若干新的下界。 相似文献
20.
图G的一个k全染色是用k种颜色对图G的顶点集和边集进行染色使得相邻接的或相关联的元素染不同的颜色,图G的全色数χ＂（G）为图G的k-全染色中的最小k值.Behzad和Vizing猜想任意简单图G的全色数都不超过Δ（G）＋2,已经证明了此猜想对最大度不是6的平面图成立,而且最大度不小于9的平面图G的全色数为Δ（G）＋1.本文利用差值转移方法研究了最大度小于9的一些情况,证明了最大度为4,5,6,7,8的平面图G,如果其围长不小于8,则其全色数也为Δ（G）＋1. 相似文献