公路改建工程路基拓宽处理方法的探讨

通过对公路拓宽后新旧路基结合部位出现不均匀沉陷以及由此而导致的路面纵向裂缝病害等原因的分析,提出比较合理的路基拓宽处理方法,为其他旧路拓宽工程提供借鉴.     

板料冲压成形工艺参数的计算机优化

利用ＣＡＥ技术分析了桑塔纳轿车油底壳成形过程，并对其成形工艺参数进行优化．提出了合理的毛坯的形状和尺寸、定位位置、压边力大小、拉深筋的设置等，以此说明ＣＡＥ技术在板料成形工艺设计中的应用．     

区域水资源利用与开发潜力研究——以陕西关中灌区为例

随着人口增长和人类对水土资源的加速开发利用，自然界的水文循环和水土平衡不断受到破坏，给水分的供需和土地利用及生态环境增添了新的压力，同时也严重影响区域社会经济的持续发展，对陕西关中灌区水土资源的开发进行科学的评估研究，提出进一步开发水土资源潜力的设想，以促使在区域水土资源开发利用中，按照水资源和土地资源系统之间的结构和功能，因地制宜，进行合理匹配与组合，协调水资源与环境之间的关系，提高水土资源利用     

中国的软磁铁氧体产业

在过去的20多年里,软磁铁氧体的产量在中国以近乎平均每5年翻一番的速度增长.2007年中国软磁铁氧体的产量已经突破25万吨,占全球总产量的50%以上.中国已经毫无争议地成为全球软磁铁氧体最大生产国.由于市场的推动,中国软磁铁氧体的产量在可预见的将来仍然会保持较快的速度增长.与此同时,中国软磁铁氧体生产技术的持续进步,使中国在不远的将来也最具潜力成为全球软磁铁氧体材料及器件的研发中心.     

Co-substituted ATS-type molecular sieves and films for cyclohexane oxidation

Pure CoAPO-36 crystal grains were synthesized by hydrothermal reaction. Porous α-Al₂O₃, stainless steel and K₂Ti₆O₁₃ supported CoAPO-36 films were fabricated using in situ crystallization for the first time. SEM images and XRD measurements demonstrate that a continuous CoAPO-36 film was obtained on the K₂Ti₆O₁₃ substrate. Diffuse reflectance UV-Vis spectra indicate that Co²⁺ has been incorporated into the ATS framework. Both CoAPO-36 crystal grains and the K₂Ti₆O₁₃ supported CoAPO-36 film exhibit satisfactory catalytic activities for the oxidation of cyclohexane.     

BotGuard: Lightweight real-time botnet detection in software defined networks

The distributed detection of botnets may induce heavy computation and communication costs to network devices. Each device in related scheme only has a regional view of Internet, so it is hard to detect botnet comprehensively. In this paper, we propose a lightweight real-time botnet detection framework called Bot-Guard, which uses the global landscape and flexible configurability of software defined network (SDN) to identify botnets promptly. SDN, as a new network framework, can make centralized control in botnet detection, but there are still some challenges in such detections. We give a convex lens imaging graph (CLI-graph) to depict the topology characteristics of botnet, which allows SDN controller to locate attacks separately and mitigate the burden of network devices. The theoretical and experimental results prove that our scheme is capable of timely botnet detecting in SDNs with the accuracy higher than 90% and the delay less than 56 ms.     

Superconvergence of mixed covolume method on quadrilateral grids for elliptic problems

This paper considers the mixed covolume method for the second-order elliptic equations over quadrilaterals.Superconvergence results are established in this paper on quadrilateral grids satisfying the h~2-parallelogram condition when the lowest-order Raviart-Thomas space is employed in the mixed covolume method.The authors prove O(h~2) accuracy between the approximate velocity or pressure and a suitable projection of the real velocity or pressure in the L~2 norm.Numerical experiments illustrating the theoretical results are provided.     

Maximum likelihood estimator of the parameter for a continuous one-parameter exponential family under the optimal ranked set sampling

This paper studies a maximum likelihood estimator (MLE) of the parameter for a continuous one-parameter exponential family under ranked set sampling (RSS). The authors first find the optimal RSS according to the character of the family, viz, arrange the RSS based on quasi complete and sufficient statistic of independent and identically distributed (iid) samples. Then under this RSS, some sufficient conditions for the existence and uniqueness of the MLE, which are easily used in practice, are obtained. Using these conditions, the existence and uniqueness of the MLEs of the parameters for some usual distributions in this family are proved. Numerical simulations for these distributions fully support the result from the above two step optimizations of the sampling and the estimation method.     

萃取法分离异戊二烯工艺分析

介绍了萃取法从碳五馏份中分离异戊二烯的工艺过程,分析了生产中的技术难点,最后对国内异戊二烯萃取分离技术的开发提出建议。     

Identification of AtSM34, a novel tonoplast intrinsic protein-interacting polypeptide expressed in response to osmotic stress in germinating seedlings

Aquaporins are implicated in a wide variety of plant physiological processes, although the mechanisms involved in their regulation are not fully understood. To gain further insight into the regulatory factors involved in this process, we used a yeast two-hybrid system to screen for potential binding partners to the Arabidopsis tonoplast intrinsic protein (TIP) AtTIP1;1. This was the first protein identified to be associated with high water permeability in vacuolar membranes from Arabidopsis thaliana. Using ...