基于蚁群优化的命名数据网络QoS路由研究

针对命名数据网络(NDN)具有多样的路由转发策略,但都未能实现NDN的服务质量(QoS)保障能力,利用蚁群优化算法(ACO)设计相应的QoS路由机制(ACO_QoS)能够保障NDN的服务质量.实验结果表明:ACO_QoS能够在满足QoS的前提下找到一条花费最小的路由.     

鲁西隆起区奥陶系碳酸盐岩成岩环境演化

根据野外剖面观察和室内薄片鉴定,鲁西隆起区岩石类型主要为碳酸盐岩,包括白云岩、石灰岩及其过渡类型,其次为蒸发岩和膏溶角砾岩。研究区经历了多期次、多类型的成岩作用。储层储集空间主要包括晶间孔、粒间和粒内溶孔、残余粒内孔和粒间孔、铸模孔、溶洞和裂缝。结合研究区地质背景、岩石学特征和成岩作用分析,将该区成岩环境划分为海水成岩环境、表生成岩环境和埋藏成岩环境。其中:表生成岩环境中发育的溶蚀作用是优质储层形成的关键;海水成岩环境和中埋藏成岩环境中发育的白云石化作用对储层也起到了积极作用;而埋藏成岩环境中发育的胶结作用是造成储层物性变差的主要原因。     

单圈图的k-距离匹配控制数

单圈图是边数等于顶点数的连通图.令G=(V,E)是无孤立顶点的图,若集合DV(G)是G的一个k-距离控制集且导出子图〈D〉有完美匹配,则称D是G的一个k-距离匹配控制集.k-距离匹配控制数γkp(G)是G的最小k-距离匹配控制集的势.主要证明了单圈图k-距离匹配控制数的一个重要引理,由此找到了单圈图k-距离匹配控制数的上界,并构造了极图.     

一种最大化样本可分性半监督Boosting算法

针对数据实际分布与假设不匹配时半监督学习算法难以改善分类器性能的问题,该文提出一种最大化样本可分性半监督Boosting算法,通过引入"高密度区域局部散度最小、样本空间全局散度最大"准则来学习未标注的样本。该准则使用两种半监督假设(聚类假设和流形假设),减少了因半监督假设与数据不匹配造成的准确率下降问题。实验结果表明,该文算法有效提高了Boosting算法在符合聚类假设数据集和符合流形假设数据集上的准确性,提高了分类器噪声数据的稳定性。     

In vitro and in vivo studies on biodegradable magnesium alloy

The microstructure, mechanical property, electrochemical behavior and biocompatibility of magnesium alloy(Bio De MSM^TM) were studied in the present work. The experimental results demonstrated that grain refining induced by extrusion improves the alloy strength significantly from162 MPa for the as-cast alloy to 241 MPa for the as-extruded one. The anticorrosion properties of the as-extruded alloy also increased.Furthermore, the hemolysis ratio was decreased from 4.7% for the as-cast alloy to 2.9% for the as-extruded one, both below 5%. Bio De MSM^TMalloy shows good biocompatibility after being implanted into the dorsal muscle and the femoral shaft of the New Zealand rabbit, respectively, and there are no abnormalities after short-term implantation. In vivo observation indicated that the corrosion rate of this alloy varies with different implantation positions, with higher degradation rate in the femur than in the muscle.     

A Rhodamine-Based Sensor-for Chromogenic Detection of Cu^2＋ and Fluorescent Detection of Fe^3＋

A rhodamine-benzimidazole conjugate(RB) as a probe was investigated.UV-Vis analysis showed that a strong absorption band at 552 nm was formed with the addition of Cu~(2+),while other transition metal ions induced a little more absorption.The absorption value of RB solution at 552 nm has a linear correlation with Cu~(2+) concentration between 35-70 μmol/L;the detection limit reached 6.82×10~(-2) μmol/L,which is lower than the settled limitation for copper in the drinking water(~30 μmol/L) standardized by World Health Organization(WHO).Moreover,FL analysis showed that only Fe~(3+) could induce large fluorescence intensity enhancement at 582 nm;other common metal ions including Cu~(2+) cannot induce the enhancement.There was a good linear correlation between relative fluorescence intensity and Fe~(3+) concentration ranging from 2 μmol/L to 20 μmol/L,and the detection limit reached1.70×10~(-2) μmol/L.The results showed that RB could detect Cu~(2+)and Fe~(3+) simultaneously,with the UV-Vis and fluorescence spectroscopy,respectively.     

绿木霉ZY-01中纤维素酶EGⅣ基因的克隆及其在E.coli中的原核表达

以前期筛选到的纤维素酶高产菌株绿木霉T.viride ZY-01的总RNA为模板,利用RT-PCR技术克隆出内切葡聚糖酶EGⅣ基因,连接至pET-28a构建出重组质粒,并转化至E.coli BL21(DE3)中表达。该EGⅣ基因约有1089bp,在启动子T7lac的控制和IPTG的诱导下,目的基因成功地在原核细胞中表达。通过SDSPAGE检测得出目标蛋白分子量为39kDa,重组酶的比酶活为1.05U/mg,该酶最适pH值为6、最适反应温度为50℃。     

Research on droplet formation and dripping behavior during the electroslag remelting process

A better understanding of droplet formation and dripping behavior would be useful in the efficient removal of impurity elements and nonmetallic inclusions from liquid metals. In the present work, we developed a transparent experimental apparatus to study the mechanisms of droplet formation and the effects of filling ratio on droplet behavior during the electroslag remelting (ESR) process. A high-speed camera was used to clearly observe, at small time scales, the droplet formation and dripping phenomenon at the slag/metal interface during a stable ESR process. The results illustrate that a two-stage process for droplet formation and dripping occurs during the ESR process and that the droplet diameter exhibits a parabolic distribution with increasing filling ratio because of the different shape and thermal state of the electrode tip. This work also confirms that a relatively large filling ratio reduces electricity consumption and improves ingot quality.     

论冀中地区O、C—P凝析气藏的形成条件

据凝析油轻烃组成、甲烷及其同系物碳同位素组成、天然气与源岩吸附气指纹时比、双环倍半萜组合特征及地质结构的综合分析,查明O、C—P大多数提析气藏的油气主要来源于石炭—二叠系煤系腐植型有机质,混入了部分下第三系的油气。对石炭—二叠系成烃特点的分析表明,R。=0.6%～1.3%,以成气为主,生油为辅,原始油气比一般大于1OOCm3/t。成熟期的石炭—二叠系有机质的成烃特点和具备油气富集的良好地质条件是O、C—P凝析气藏形成的基本条件。     

苹果机《友好》汉化dBASEⅡ的设计和实现要点

本系统的目的在于为广大非计算机专为人员的用户提供一个性能价格比高、亲善性好的汉化大众化数据库管理工具.在实现上技巧地应用128k 卡,可将 Apple Ⅱ plus 机的内存“虚拟”地扩展到192k 以上,实现了 CP/M 的造字功能.