Improved Minimum Detectable Velocity in Bistatic Space-Based Radar

Single orbit bistatic space-based radar （SBR） is composed of two radars in the same orbit. The characteristics of the clutter Doppler-angle spectrum of a single orbit bistatic SBR show that the slope of the mainbeam clutter spectrum is highly sensitive to the cone angles. Therefore, the minimum detectable velocity of the bistatic system is dependent on the cone angle. Then a new combined working mode of singleorbit bistatic SBR system was developed in which one radar will act as the transmitter and another as the receiver to improve detection performance for all angles. Simulation results by space-time adaptive processing verify the improved detection performance. The new design also reduces the average power of each radar system and the size and weight of the on-board solar array-battery system.     

德、日、台民事诉讼程序转换制度之比较与借鉴

在以简化诉讼程序为主流的背景下,简易程序成为各国普遍关注的焦点的同时,简易程序与普通程序的相互转换问题也日益凸显,我国也不例外。鉴于我国目前的立法和实践在程序转换问题上还存在许多不足,笔者通过考察其他国家（主要是大陆法系国家）的相关规定,观察我国的司法实践,对我国程序转换中几个重要问题的构建或完善提出初步设想。     

Effects of fish protein hydrolysate on growth performance and humoral immune response in large yellow croaker (Pseudosciaena crocea R.)

We investigated the effects of fish protein hydrolysate (FPH) on growth performance and humoral immune response of the large yellow croaker (Pseudosciaena crocea R.). One thousand and two hundred large yellow croakers [initial average weight: (162.75±23.85) g] were divided into four groups and reared in floating sea cages (3 m×3 m×3 m). The animals were fed with 4 diets: basal diet only (control) or diets supplemented with 5%, 10% and 15% (w/w) FPH. The results show that dietary FPH levels significantly influenced the growth and immunity of the large yellow croaker. Compared with the control group, total weight gain (TWG) in all treatment groups, relative weight gain (RWG) and specific growth rate (SGR) in fish fed with diets supplemented with 10% and 15% FPH were significantly increased (P<0.05). Similar results were observed in immune parameters [lysozyme activity, serum complements, immunoglobulin M (IgM)]. Lysozyme activity, complement C4 and IgM were also significantly increased (P<0.05) in fish fed with diets supplemented with 10% and 15% FPH, while complement C3 level was significantly increased (P<0.05) in all treatment groups. In general, with the supplementation of FPH, particularly at dose of 10%, the growth performance and immunity of the large yellow croaker can be improved effectively.     

论《集结号》对当代中国电影的意义

《集结号》的成功上演,对处于困境之中的当代中国电影具有重要的意义,其中的人文关怀与人道主义．对战争状态下人性的思考,对入的生命价值的尊重,在电影主流文化价值与国家意识形态、大众文化与精英文化之间形成良性互动,以及国际电影主流文化价值与民族本土文化价值的契合,使冯小刚的电影展现了一个全新视景,也是冯小刚对中国电影国际化进程的一次成功探索与尝试,预示了中国电影新的文化诉求,给处于困境中的中国电影的突围之路提供了新的可能性。     

面向移动目标的WSN单个检测模式覆盖问题

基于能量暴露模型,分析了环境噪声、传感器和被测移动目标物理参数节点检测半径的影响,提出了一种大规模无线传感器网络(WSN)在二维平面上节点归一化密度的三角形分析模型(TAM).以检测概率为覆盖性能评价指标,采用归一化分析方法,用TAM分析了归一化路径长度小于1时归一化密度与单个检测模式的检测概率关系,得到了最坏情况下节点归一化临界密度上限.仿真实验结果表明归一化临界密度可较为准确地由检测概率和归一化路径长度确定,可为大规模无线传感器网络的传感器参数选择和部署提供参考.     

关于拉格朗日中值定理的证明

拉格朗日中值定理是微分学中一个应用广泛的重要定理,针对罗尔定理证明拉格朗日中值定理的问题,从几何意义及坐标系转换等方面分析了构造辅助函数的思路及方法。拓宽了中值定理证明的思路。     

圆分布双跳无线传感器网络配置及拓扑发现修复算法与仿真

指出了无线传感器网络在从战场到环境监测的许多领域都表现得越来越重要,给出了一类圆分布双跳无线传感器网络,并提出其安全性要求和模型．对于其面临的威胁,在权衡网络资源局限性的基础上,提出了相应解决方案,包括拓扑发现算法、网络配置协议和网络修复算法（TDNSR）。仿真结果表明：和SPIN算法相比,TDNSR能迅速实现网络拓扑发现和配置并修复,能有效减少资源开销。     

特定竞赛图中的最长圈问题

若有向图T满足条件:uv(≠)A(T)使得dT (u) dr-(v)≥k,则称图T满足O(k)条件.讨论了有向图及特殊有向图的最长圈,并且给出了某些特殊竞赛图的Hamilton圈的存在条件.     

Visualizing transient events in amino-terminal autoprocessing of HIV-1 protease

HIV-1 protease processes the Gag and Gag-Pol polyproteins into mature structural and functional proteins, including itself, and is therefore indispensable for viral maturation. The mature protease is active only as a dimer with each subunit contributing catalytic residues. The full-length transframe region protease precursor appears to be monomeric yet undergoes maturation via intramolecular cleavage of a putative precursor dimer, concomitant with the appearance of mature-like catalytic activity. How such intramolecular cleavage can occur when the amino and carboxy termini of the mature protease are part of an intersubunit beta-sheet located distal from the active site is unclear. Here we visualize the early events in N-terminal autoprocessing using an inactive mini-precursor with a four-residue N-terminal extension that mimics the transframe region protease precursor. Using paramagnetic relaxation enhancement, a technique that is exquisitely sensitive to the presence of minor species, we show that the mini-precursor forms highly transient, lowly populated (3-5%) dimeric encounter complexes that involve the mature dimer interface but occupy a wide range of subunit orientations relative to the mature dimer. Furthermore, the occupancy of the mature dimer configuration constitutes a very small fraction of the self-associated species (accounting for the very low enzymatic activity of the protease precursor), and the N-terminal extension makes transient intra- and intersubunit contacts with the substrate binding site and is therefore available for autocleavage when the correct dimer orientation is sampled within the encounter complex ensemble.     

电大开放教育教师角色转换引导和激励探析

电大的性质和任务不同于传统的高等学校,其教学管理呈现出与传统高校不一样的特征。基于这种特征的认识,电大教师应定位于激发学生创造力的角色、授人与渔的角色、技能导师的角色等。而营造良好师生关系、调整评价和激励机制等则可引导和激励教师顺利实现这种角色定位。