浅谈公路建设工程造价管理与有效控制

工程造价在工程建设中占有越来越重要的地位,加强造价控制管理时于公路建设领域的相关意义十分重大,作为一名公路工程造价人员,有责任确保公路建设预定的"质量、投资、进度"目标的顺利实现.文章主要从公路工程造价的编制出发,分析当前公路工程造价编制中易出现偏差的原因作了简单分析,并提出相应的建议与对策.     

An approach for user’s trajectory prediction based on the trajectory cluster

The existing user’s trajectory prediction methods considered little about the interrelation among users and would fail if the user historical trajectory data were lack. This paper presents a user’s trajectory prediction model and corresponding algorithms by the historical trajectories of users based on the trajectory cluster. The experimental results on MDC dataset show that the proposed method has great improvement in efficiency, accuracy, and scalability comparing with the traditional methods, and it also be applied to the situation where user’s historical trajectory data are lacked.     

抗大鼠肝脏脂酶抗血清的制备及应用

按照ＲＨＬｃＤＮＡ核苷酸序列所预示肽链的氨基酸序列，化学合成了与肽链Ｎ端、Ｃｕｍｄｊｔ ｋ ｕｋ ｓｈ ｃｆ ｙｉｄ ｒ ３ｗｈ ｅｅｄｙ     

Context-aware recommendation in mobile environments: An approach based on interest resonance

The recommendation system can efficiently solve the information overload in mobile Internet. Thus, how to effectively utilize context information to improve the accuracy of recommendation becomes the research focus in the field. This article puts forward a novel approach to realize the context-aware recommendation in mobile environments. It first gets users’ interest resonance with a hash-based interest resonance mining algorithm. Then, it calculates the association degree between the user and the item and then predicts the user’s rating on the item. Finally, it comprehensively figures out the recommending index. Moreover, this article also designs a personal recommendation model for the users and provides relevant decision-making coefficients. Experiments have demonstrated that our approach is superior to the traditional ones (RMP, RSTE, MD and BBBs) in both performance and efficiency.     

大鼠脑损伤后海马GAP-43 mRNA水平的变化

以DIG（Digoxigenin）标记的GAP-43 cDNA片段为探针,使用原位杂交方法,检测了大鼠皮层硬性脑挫伤后GAP-43 mRNA水平的变化。结果表明：海马CA3、CA1和DG区的GAP-43 mRNA水平在损伤后48h明显升高,其中CA3区变化最甚,而且伤侧比对侧显著。1周和2周后表达仍维持较高水平,但不如48h的高,这显示表达的峰值在1周之内。上述结果为研究脑损伤后生理及机能代偿的修复机制提供了有意义的信息。     

防空C3I多传感器数据融合仿真系统设计

根据防空武器系统数据融合的特点，构造数据融合仿真系统研究平台，进行仿真系统软硬件设计，并在仿真平台基础上，提出了数据融合评估的数学模型，给出了评价准则，从而赋予数据融合仿真系统研究平台以灵魂。     

地域通信网的性能分析

研究了在有限的数据用户的情况下，地域通信网的性能。采用有限信源排队模型及蒙特卡洛仿真相结合的方法分析了地域网的阻塞概率，并据此给出了网络吞吐量及延时性能的解析表达式，最后分析比较了不同用户规模，不同拓扑结构及链路容量对网络性能的影响。     

Evaluation of the occurrence possibility of SNP in <Emphasis Type="Italic">Brassica napus</Emphasis> with sliding window features by using RBF networks

We extract some physical and chemical features re-lated to the occurrence of single nucleotide polymorphism (SNP) from three groups of sliding windows around SNP site,and then make the predictions about accuracy by using radial basis function (RBF) networks. The result of the forward sliding windows sug-gests that the accuracies and Matthews correlation coefficient (MCC values) ascend with the increasing of length of sliding windows. The accuracies range from 73.27 % to 80.69 %,and MCC values range from 0.465 to 0.614. The backward sliding windows and the sliding windows with fixed length three are de-signed to find the crucial sites related to SNP. The results imply that the occurrence possibility of SNP relies heavily on the above physical and chemical features of sites which are at a distance around 20 bases from the SNP site. Compared with the support vector machine (SVM),our RBF network approach has achieved more satisfactory results.     

关于Faudree定理的一个注记

假定Ｇ是顶点数的ｎ的２－连通图，Ｇ中顶点数为４且包含爪Ｋ１．３的子图称为爪型子图。本文证明了对Ｇ的任一爪型图Ｆ，任何ｕ，ｖ属于Ｖ（Ｆ），由距离ｄ（ｕ，ｖ）＝２＝│Ｎ（ｕ）ＵＮ（ｖ）│≥２ｎ－１／３，则Ｇ是哈密顿图。     

基于自组装二氧化钛空穴阻挡层的高效钙钛矿太阳能电池

器件兼容功能层的自组装工艺是一种简单、可行和节能的策略。在介孔钙钛矿太阳能电池(perovskite solar cells, PSCs)中,致密的TiO₂膜起到空穴阻挡层的作用,而介孔的TiO₂膜起到电子传输层的作用。然而,这两层通常都要通过高温退火法获得。在此,我们通过室温自组装工艺沉积了致密的TiO₂薄膜,以作为PSCs有效的空穴阻挡层。通过沉积时间控制致密TiO₂薄膜的厚度。优化致密TiO₂薄膜的厚度(80 nm),有无空穴传输层的介孔PSCs的能量转化效率分别为17.95%和10.66%。值得注意的是,基于自组装TiO₂的全低温PSCs显示出16.41%的能量转化效率。