一类非线性Schrdinger方程整体解

研究了一类非线性Schr(?)dinger方程初边值问题解的整体存在唯一性及渐近性.     

24通道光路模型

本文提出的24通道光路模型使 OTLIEB 模型得到了改善.由于本模型具有通道阻塞自锁功能,因而完全排除了课表编排过程中一切可能出现的冲突.     

一致区域的定义及单叶性准则

O.Martio, J.Sarvas及F. W . Gehring, B. G.Osgood分别给出了一致区域的定义。本文给出了一致区域的一个形式上非常简单的新定义,并且证明了它与上面两个定义的等价性。在这个定义的基础上,我们得出了一个函数的单叶性定理。最后,对穿孔圆盘的单叶性内径给出了一个估计。     

从供需平衡思考城乡统筹——以江都市为例

结合江都市城市总体规划实践,从保持要素和资源流动的供需平衡这一基本"常识"出发,以有效推进"城镇化"为落脚点,建构以农村发展为需求方、以工业化进程为供给方的供需模型,提出了优化江都市城镇化进程的规划应对策略和政策建议.     

几种大豆对大庆石化污水污染的抗性比较

本文通过4种大豆在大庆石化污水浸种发芽以及初期灌溉的条件下,体内抗污生化指标过氧化物酶同工酶含量和酶谱变化的测试,来确定其对石化污水抗污能力的强弱.结果表明:合丰25号抗性最强,369号和黑河5号居中,9丰1号最弱.     

甲壳素磷酸酯钾的合成及其生物活性研究

用甲壳素合成1#～7#甲壳素磷酸酯及甲壳素磷酸酯钾，分别测定了1#～7#甲壳素磷酸酯的取代度，将甲壳素磷酸酯钾配成0．5mg／L，2mg／L，5mg／L，10mg／L，20mg／L溶液，以蒸馏水为对照，进行台湾四九甜菜心、水稻种子的浸种发芽实验，浸种23～48．5h；培养温度29.5℃；每只培养皿50粒，每种浓度重复3次．结果表明：1#～5#、7#甲壳素磷酸酯钾对水稻种子均不具有促进作用；1#、2#、5#、7#对菜心种子均不具有促进作用，而6#甲壳素磷酸酯钾对水稻种子的发芽有明显的促进作用，3#、4#、6#甲壳素磷酸酯钾对菜心种子有明显的促进作用，其质量浓度以0．5～20mg／L为最佳，其中6#甲壳素磷酸酯钾对水稻种子的发芽率分别对照组增长8．0％；3#、4#、6#甲壳素磷酸酯钾对菜心种子的发芽率分别对照组增长10．0％、9．3％、14．0％。     

Predictive control for mechanical system with backlash based on hybrid model

The mechanical system with backlash is distinguished between a “backlash mode” and a “contact mode”. The inherent switching between the two operating modes makes the system a prime example of hybrid system. For eliminating the bad effect of backlash, a piecewise affine (PWA) model of the mechanical servo system with backlash is built. The optimal control of constrained PWA system is obtained by taking advantage of model predictive control (MPC) method, and the explicit solution of MPC in a look-up table form is figured out by combining the dynamic programming and multi-parametric quadratic programming, thereby establishing an explicit hybrid model predictive controller. Furthermore, a piecewise quadratic (PWQ) function for guaranteeing the stability of closed-loop control is found by formulating the search of PWQ function as a semi-definite programming problem. In the tracking experiments, it is demonstrated that the explicit hybrid model predictive controller has a good traction control effect on the mechanical system with backlash. The error meets the demands of real system. Further, compared to the direct on-line computation, the computation burden is reduced by the explicit solution, thereby being suitable for real-time control of system with short sampling time.     

Melanoma genome sequencing reveals frequent PREX2 mutations

Melanoma is notable for its metastatic propensity, lethality in the advanced setting and association with ultraviolet exposure early in life. To obtain a comprehensive genomic view of melanoma in humans, we sequenced the genomes of 25 metastatic melanomas and matched germline DNA. A wide range of point mutation rates was observed: lowest in melanomas whose primaries arose on non-ultraviolet-exposed hairless skin of the extremities (3 and 14 per megabase (Mb) of genome), intermediate in those originating from hair-bearing skin of the trunk (5-55 per Mb), and highest in a patient with a documented history of chronic sun exposure (111 per Mb). Analysis of whole-genome sequence data identified PREX2 (phosphatidylinositol-3,4,5-trisphosphate-dependent Rac exchange factor 2)--a PTEN-interacting protein and negative regulator of PTEN in breast cancer--as a significantly mutated gene with a mutation frequency of approximately 14% in an independent extension cohort of 107 human melanomas. PREX2 mutations are biologically relevant, as ectopic expression of mutant PREX2 accelerated tumour formation of immortalized human melanocytes in vivo. Thus, whole-genome sequencing of human melanoma tumours revealed genomic evidence of ultraviolet pathogenesis and discovered a new recurrently mutated gene in melanoma.     

雅可比矩阵在机器人运动中的应用

利用雅可比矩阵的性质研究机器人的逆运动问题,特别地讨论了带冗余度和矩阵奇异的情形.首先给出逆运动的求解方法,然后给出它的应用,用梯度下降法给出关节角的迭代公式,最后给出模拟仿真结果.仿真结果表明该方法准确高效,为机器人的运动规划和控制的实现奠定基础.      

热连轧机AGC系统的动态仿真

参照某热轧厂实际情况建立了热连轧AGC系统的动态模型,通过该模型进行动态仿真,研究了各种参数变化对于轧件出口厚度的影响.结果表明,该模型繁简适度,有利于对多种因素进行分析.