ZG35CrMnSiRe热处理的试验研究

ZG35CrMnSiRe铸钢经不同的热处理,对其强度、硬度、塑性和冲击韧性等机械性能进行测定,实验结果表明其综合机械性能良好。     

用政治手段解决国际冲突的有益探索——以朝核问题六方会谈为例

中国在政治解决朝核问题的过程中扮演着作为第三方的大国斡旋者角色,从理论上讲,发挥这一角色作用有其特殊的涵义、困难性和复杂性,并因之要求中国的外交斡旋活动完成一定的调解任务。“六方会谈”是政治解决朝核问题的正确选择和有效途径,中国在促成六方会谈的成功举行并获得初步成果的过程中展示了高超的外交斡旋艺术,包括给予帮助的技术、支持冲突方互动的技术和操控技术,部分地完成了对于朝美之间冲突的调解任务。在中国积极和有效的外交斡旋努力下,朝核问题的解决沿正确的方向前行。     

全堆芯格林函数方法的格林函数库的建立

提出了利用微扰正向扩散计算方法的思想,建立了全堆芯格林函数方法（ＣＧＦＭ）中的格林函数库。利用格林函数库取消了内迭代,从而大大提高了中子扩散方程的求解速度。针对我国秦山核电厂的外－内和低泄漏两种布料方案进行了校核计算。结果表明,计算精度与格林函数节块方法（ＮＧＦＭ）相当,计算速度提高近９倍。     

Fuzzy Filter Design for Affine Systems with Sensor Faults: A Dynamic Event-Triggered Approach

This study addresses the issue of dynamic event-triggered-based filtering for fuzzy affine systems. To alleviate the utilization of constraint bandwidth resources and improve the efficiency of the signals exchange, a dynamic event-triggered protocol is forwarded to regulate the trigger instants with objective system states. Meanwhile, the nonhomogeneous Markov process is proposed to characterize the dynamic behaviors of sensor faults, where the time-varying transition probabilities belong to a c...     

Adaptive Asymptotic Tracking Control for Stochastic Nonlinear Systems with Unknown Backlash-Like Hysteresis

In this study, an adaptive asymptotic tracking control problem is considered for stochastic nonlinear systems with unknown backlash-like hysteresis. By utilizing backstepping technology and bound estimation approach, an adaptive asymptotic tracking control scheme is designed, where fuzzy systems are applied to approximate unknown function terms, the effect of hysteresis and stochastic disturbances is compensated appropriately. The proposed scheme ensures that the tracking error can asymptoticall...     

Parallel Optimization of the Crystal-KMC on Tianhe-2

The Kinetic Monte Carlo(KMC) is one of the commonly used methods for simulating radiation damage of materials. Our team develops a parallel KMC software named Crystal-KMC, which supports the Embedded Atom Method(EAM) potential energy and utilizes the Message Passing Interface(MPI) technology to simulate the vacancy transition of the Copper(Cu) element under neutron radiation. To make better use of the computing power of modern supercomputers, we develop the parallel efficiency optimization model for the Crystal-KMC on Tianhe-2, to achieve a larger simulation of the damage process of materials under irradiation environment. Firstly, we analyze the performance bottleneck of the Crystal-KMC software and use the MIC offload statement to implement the operation of key modules of the software on the MIC coprocessor. We use Open MP to develop parallel optimization for the Crystal-KMC, combined with existing MPI inter-process communication optimization, finally achieving hybrid parallel optimization. The experimental results show that in the single-node CPU and MIC collaborative parallel mode, the speedup of the calculation hotspot reaches 30.1, and the speedup of the overall software reaches 7.43.     

有交易成本的期权定价模拟组合证券法

完全市场条件下的欧式期权定价已有受欢迎的Ｂ－Ｓ定价公式,有交易成本的不完全市场期权定价还没有解决。本文用组合证券模拟期权收益构造定价基本方程式,设计循环计算程序计算期权价格,并提出它的Ｂ－Ｓ定价公式的修正形式。     

线性定常模糊随机系统的响应分析

证明了线性定常模糊随机系统的输出在均方意义下的收敛性,并给出了系统响应的模糊概率特征关系方程。     

SEA方法及其在C~3I系统效能分析中的应用(Ⅱ)——交战模型

本文采用ＳＥＡ方法建立了Ｃ３Ｉ系统在一种典型交战环境下的系统效能模型及其分析程序,举例说明了系统效能计算结果的战术涵义。由于Ｃ３Ｉ系统所处的交战环境是千变万化的,因此采用ＳＥＡ方法建立一般交战情形下通用的Ｃ３Ｉ系统效能模型仍是十分困难的工作。然而,本文的分析过程可起到一定的示范作用。     

风险、等效边际成本与投资规模

用金融期权的分析方法研究了非完全竞争市场条件下风险、企业的等效边际成本和投资规模之间的关系,并讨论了需求弹性和企业商品的市场占有率的影响．研究表明风险促使企业降低等效边际成本,导致边际成本随资本量递减企业增加投资,递增企业减少投资．需求弹性和企业商品的市场占有率对等效边际成本和投资规模也有明显的影响．