排序方式: 共有34条查询结果,搜索用时 15 毫秒
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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. 相似文献
2.
余瑞元 《北京大学学报(自然科学版)》1998,34(6):759-764
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 相似文献
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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。 相似文献
4.
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. 相似文献
5.
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. 相似文献
6.
防空C3I多传感器数据融合仿真系统设计 总被引:13,自引:0,他引:13
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。 相似文献
7.
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. 相似文献
8.
陈瑞袁 《福建师范大学学报(自然科学版)》1995,11(3):21-26
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。 相似文献
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根据新结构经济学原理,资源禀赋的内生力和创新是促使产业转型升级的重要动力.在纵观2016年—2020年长江中游鄂东城市GDP及其相关指标、横观鄂东城市要素禀赋结构之后分析认为,鄂东城市要想在长江大保护战略中实现高质量发展,必须坚持绿色创新驱动发展优先,以有效市场促进鄂东城市群产业融合发展,以有为政府引导鄂东城市群的经济一体化发展. 相似文献
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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。 相似文献