布尔函数相关免疫性的研究

在研究布尔函数主要性质的基础上,本文利用频谱理论中的Walsh循环谱,证明了布尔函数相关免疫性与其它性质之间存在一定的关系,并且进一步得出了在满足一定的频谱等式的前提下,布尔函数可以同时满足平衡性和相关免疫性、满足相关免疫性和一定的扩散准则以及满足相关免疫性和一定的非线性度。     

Test on Seismic Behaviors of Reinforced Concrete Beams Composite Rehabilitation with Bonded Carbon Fiber Reinforced Polymer and Steel Plate

Neither the Carbon Fiber Reinforced Plastic nor the steel plate strengthening concrete components shows sufficiency in improving the structures' seismic behaviors independently, while they complement each other by the way of composite strengthening. Six reinforced concrete beams, five of which are strengthened, were comparatively and experimentally tested under low frequency cyclic load to investigate their mechanical performances such as characteristic of resilience, hysteretic curve, seismic behaviors, skeleton curve, degeneration of rigidity and loading capacity. It is indicated that the way of composite strengthening can boost the beams′ ultimate bearing capacity, ductility and deformability capacity effectively, and it can delay rigidity degeneration and improve the seismic behaviors of the beams. Also, the CFRP and steel plate can work together very well.     

A spread spectrum steganalysis algorithm based on discontinuity detection

A novel audio steganalysis method is proposed.. the audio signal is denoised with wavelet transform. Then, a part of noise signal with different length is intercepted circularly and is used to calculate the cross correlation sequence with the rest of the noise signal. With the wavelet discontinuity detection technique, the feature is extracted from the cross correlation sequence for steganalysis and find out the steg audio. The detection rate is determined by the embedding strength of the secret message other than the embedding capacity. Experimental results show that the more embedding intensity of PN sequence is, the higher the detection rate will be. The detection rate of the algorithm is above 80% when the strength of the PN sequence is about 0.002, which demonstrates that the proposed algorithm has good detection performance.     

Cellular automata spatial temporal data model and forecasting approach

The standard cellular automata(CA) model is expanded to meet requests of space time dynamic simulation and forecast under the platform of geographic information system(GIS). Taking power load forecasting of the electric power industry as the specific application, the relations between dynamic model of the land use and power load space are established. The data and attribute data interactive discrete in spatial temporal data management have been solved. The CA theory is practically used to simulate the process of urban land use dynamic development, to forecast future land use types of each small area, to establish spatial load forecasting model. It breaks through the localization of all kinds of forecasting methods of traditional space time separation power prediction. The effectiveness of the prediction method is verified by example.     

On-demand routing algorithm based on load balancing and mobility prediction in wireless mobile Ad hoc network

The traditional routing protocol for wireless mobile ad hoc networks is unable to achieve balanced energy consumption and could not adapt to the dynamic topology changes well.A novel on-demand rooting algorithm is proposed based on load balancing and mobility prediction.The proposed rooting algorithm excludes the unstable links in routing discovery,and allows the node with more energy forward the routing request packet preferentially.In addition,it adopts the active local routing recovery strategy by predicting the link connection time,and finishes the repair work before the link being actually failure.The simulation experiments demonstrate that,comparing with the traditional AODV protocol,with slight increase of the rooting control overhead,the proposed algorithm increases the average packet delivery ratio,decreases the average end-to-end delay of the data packets,and achieves load balancing in the network and prolong the life-span of the network,which shows the proposed algorithm is highly practical.     

产汽冷凝器换热管泄漏原因分析

对开裂换热管进行了腐蚀坑电镜形貌和能谱分析,结合换热管裂纹形态及腐蚀机理分析结果 ,得出了换热器泄漏是由缝隙腐蚀引起的应力腐蚀开裂的结论 .     

放线菌G30菌株发酵液抗菌谱及稳定性的研究

研究土壤放线菌G30次生代谢产物的抗菌谱及其发酵液的稳定性,采用抑制菌丝生长速率法、管碟法测定发酵液的生物活性,在不同条件下测定发酵液的稳定性。结果表明:在对12种供试病原真菌的抑制效果中,6种菌丝生长的抑制率达到80%以上;在连续传代10代过程中,4℃及常温保存条件下,G30菌株的培养特征和抑菌活性基本没有变化;发酵液在60~100℃的温度梯度下没有丧失活性,在强酸(pH值2)、强碱(pH值12)条件下也都比较稳定。G30菌株的代谢产物具有广谱抗菌活性和强稳定性,具有一定的开发价值。     

施用蛋鸡粪的龙眼园土壤质量现状评价

本文调查了蛋鸡养殖场粪便产生量及处理利用现状等基本资料,选点采集养殖场配套龙眼园的土壤样品,通过分析测定有机质、全氮、全磷、铜、锌等指标,探讨了施用蛋鸡粪对龙眼园土壤质量的影响,并对龙眼园土壤环境现状进行评价.结果表明,该养殖场龙眼园土壤粪便当量负荷为19.14 t·hm-2,未超过以氮计的土壤粪便当量负荷警戒值.四个...     

基于Etabs的RC框架结构Pushover方法原理及应用

静力弹塑性分析方法(Static Elastic-plastic Analysis Procedure)是一种简单有效评价结构抗震性能的工具,其中能力谱法被广泛应用。介绍了能力谱法的原理及其应用情况,并给出实例。     

彩色小麦色素的光谱及抗氧化特性

国内外对彩色小麦色素作了一定的开发研究,但彩色小麦清除二苯基-2-苦肼基自由基的研究还很少。本文研究彩色籽粒色素的光谱及抗氧化特性,通过以普通小麦（中国春）和抗坏血酸为对照,用DPPH法测定黑粒小麦,蓝粒小麦,紫粒小麦,红粒小麦,白粒小麦色素的抗氧化、清除自由基的能力,其随着各种小麦色素浓度的提高,其抗氧化、清除自由基的能力也相应地提高。各种彩色小麦色素粗提物具有量效关系的抗氧化活性,其清除自由基能力大于普通小麦,但小于抗坏血酸,其中黑粒小麦色素清除自由基的能力最强。普通小麦、黑粒小麦、蓝粒小麦、紫粒小麦、红粒小麦、白粒小麦和Vc清除50% DPPH自由基的有效浓度（EC50）分别为188.27、54.26、76.22、94.05、126.24、110.04、0.139,其自由基清除能力AE分别为0.53×10-2、1.84×10-2、1.31×10-2、1.06×10-2、0.79×10-2、0.91×10-2、719×10-2。结果表明随着小麦种皮颜色的加深其色素粗提物清除自由基的能力就越强,这都为进一步研究、开发和利用彩色小麦的色素奠定理论基础。