Mersenne数的最大素因数

设p是素数.Mp=2p-1是Mersenne数.证明了:当p≥11时,必有P(Mp)>(πp/logp)2或者Q(Mp)>8p2,其中P(Mp)和Q(Mp)分别是Mp的最大素因数和无平方因子部分.     

Multiobjective routing in multiservice MPLS networks with traffic splitting — A network flow approach

A multiobjective routing model for Multiprotocol Label Switching networks with multiple service types and traffic splitting is presented in this paper.The routing problem is formulated as a multiobjective mixed-integer program,where the considered objectives are the minimization of the bandwidth routing cost and the minimization of the load cost in the network links with a constraint on the maximal splitting of traffic trunks.Two different exact methods are developed for solving the formulated problem,one based on the classical constraint method and another based on a modified constraint method.Avery extensive experimental study,with results on network performance measures in various reference test networks and in randomly generated networks,is also presented and its results are discussed.     

Laccases of prokaryotic origin: enzymes at the interface of protein science and protein technology

The ubiquitous members of the multicopper oxidase family of enzymes oxidize a range of aromatic substrates such as polyphenols, methoxy-substituted phenols, amines and inorganic compounds, concomitantly with the reduction of molecular dioxygen to water. This family of enzymes can be broadly divided into two functional classes: metalloxidases and laccases. Several prokaryotic metalloxidases have been described in the last decade showing a robust activity towards metals, such as Cu(I), Fe(II) or Mn(II) and have been implicated in the metal metabolism of the corresponding microorganisms. Many laccases, with a superior efficiency for oxidation of organic compounds when compared with metals, have also been identified and characterized from prokaryotes, playing roles that more closely conform to those of intermediary metabolism. This review aims to present an update of current knowledge on prokaryotic multicopper oxidases, with a special emphasis on laccases, anticipating their enormous potential for industrial and environmental applications.     

Comparison of breeding biology aspects of Fluvicola nengeta (Aves: Tyrannidae) between two nesting sites

Fluvicola nengeta is an insectivorous bird that belongs to the Tyrannidae family, which lives close to bodies of water and can occur in urban areas as well. It makes use of natural and man-made substrates to build its nests. This study aims at describing the reproductive biology of F. nengeta by comparing nests built on vegetation and man-made structures as to their shapes, nest dimensions, building materials, distance from bodies of water and reproductive success. Forty-four nests were found, where 30 were located in vegetation and 14 on man-made structures. Nests did not exhibit any single pattern and were divided into three distinct shapes: closed/globular/base; closed/ovoid/base (45.5%; n = 5 for both) and low cup/base (9%; n = 1). Nests built on man-made structures exhibited a larger amount of anthropic material, such as plastic and paper, instead of plant-derived materials. Nests on man-made structures were found to be higher up from the ground (459.8 ± 46.9 m) and farther from water (232.9 ± 54.8 m) in comparison to those on vegetation (92.2 ± 28.6 m and 7.3 ± 4.7 m, respectively), aside from exhibiting a higher Mayfield reproductive success (37%) when compared to nests built on vegetation (34%). The estimated values of the daily survival rate (DSR) for vegetation nests were 0.997 for the incubation period and 0.928 for the nestling period. In man-made structure nests, DSRs were 0.968 and 0.964, respectively, during the incubation and nestling periods. The period survival rate (PSR) of nests in vegetation was significantly higher than the PSRs of nests in man-made structures during the incubation period. DSRs did not differ between incubation and nestling periods for either nesting sites.     

电动汽车整车控制器BootLoader功能开发

传统的电动汽车整车控制器开发中,对程序的烧写是通过BDM调试接口实现的,该方法不仅在控制器应用程序开发阶段会影响开发效率,而且会给后期整车控制器升级维护造成极大的不便.通过嵌入式系统引导加载程序(即BootLoader)对解决上述问题具有较强的实际意义.本文提出了整车控制器开发中BootLoader功能实现的整套设计与解决方案,并将该方案应用到实车运行中.最后,通过实际应用的测试与分析,结果表明该功能具有极高的可行性与有效性.     

项目经理冲突管理模式对下属离职倾向的作用

以394名工程项目成员问卷调查为基础,从冲突管理第三方角度出发,探讨项目经理管理下属间冲突的决断、审慎和回避三种模式分别对冲突当事人离职倾向产生何种影响.模型以领导成员交换品质(LMX)为中介变量,是否有共事经历和项目团队类型作为调节变量.研究结果表明采取决断和审慎的冲突管理模式会显著加强LMX的品质,而回避模式则会带来LMX的低质化从而推升员工离职倾向.LMX在冲突模式和离职倾向间起部分中介作用,共事经历会强化冲突管理模式对LMX的影响.     

Ljunggren 定理的一个应用

运用Ljunggren定理解决了一个有关Smarandache平方余函数的Diophantine方程问题.     

关于Diophantine方程x3+1=Dyn

设D是不能被形如6k+1的素数整除的正整数,文章证明了:方程X3+1=Dyn仅当D=20时 有正整数解(x,y,n)=(19,7,3)适合x>1以及n>2。     

X光图像增强处理的研究

X线图像有很宽的动态范围,而人眼不能分辨这样微小灰度的差别。为了提高组织结构细节的显示,文中提出了一种自适应的直方图均衡算法,实验证明,该算法能够有效的提高图像的对比度,同时抑制噪声的放大。