基于杂交模型及逻辑分解算法的JSSP研究

作业车间调度,是指为具体的任务(工序)安排生产资源(机器)并确定合理的加工顺序,是一个典型的NP-Hard问题,有着广泛的研究.首先介绍混合整数规划MIP和约束编程CP的互补优势.然后建立JobShop调度问题的MIP/CP杂交模型,并针对杂交模型的特点提出一种基于逻辑的分解算法.最后用几个实例证明了该模型及算法的求解速度.     

ModBus通信协议在舞台吊杆控制系统的应用

本文通过对ModBus协议的格式和使用要求以及西门子PLC-S7-300相关模块CP341的研究,从而实现了在舞台控制系统中通过ModBus协议通讯方式来对变频器进行控制的目的,给出了设计原理以及相关程序.由于ModBus的标准协议开放简单高效,通俗易懂,使得本系统设计更为便捷,达到了预期控制的效果.     

Abrupt climate change and collapse of ancient civilizations at 2200BC-2000BC

Plentiful evidence of historical, archaeological and palaeoclimatic studies proved that an abrupt change from wetter to drier climate occurred over the Nile Valley, the Mesopotamia, the Indus Valley and Huanghe River Valley at 2200BC-2000BC. The abrupt change was developed based on the general lowering of temperature in the middle latitudes, and was a strong cold event since the beginning of the Megathermal (8.5-3.0 kaBP). Collapse of Nile civilization appeared at the First Intermediate Period (2181BC-2040BC). Civilization of Mesopotamia began collapse following the disintegration of Akkadian Empire. This process lasted to the foundation of Babylon Kingdom from 2200BC to 1900BC. Indus civilization abruptly fell off at 1800BC. A widespread alternation of archaeological cultures happened in China at ca. 2000BC except only in its central part. Longsheng culture was replaced by the Erlitou culture, which is now acknowledged in China as Xia Culture. Foundation of Xia Dynasty at 2070BC opened a new chapter in the development of Chinese civilization. Studies indicated that abrupt climate change may be caused by the weakening of the Thermohaline Circulation (THC).     

OFDM系统中非充分循环前缀时预编码器的设计

提出了一种在正交频分复用(orthogonal frequency division multiplexing,OFDM)系统中,当信道最大时延大于循环嵌缀(cyclic prefix,CP)长度时的预编码器的设计方法。该方法利用信道信息设计预编码器,并考虑到信道变化对预编码器性能的影响。仿真结果表明该预编码器能有效消除载波间干扰(intercarrier interfer-ence,ICI)和符号间干扰(intersymbol interference,ISI),提高了系统的性能。     

B介子系统CP破坏研究

本文对B介子系统进行了全面系统的研究,计算了Bd与Bs到各种可能双重子未态衰变过程中的cp破坏效应。我们的结论是:Bs系统中存在大的混合效应,但cp破坏的不对称号参数较小,实验上难以探测到。Bd系统中,B_d~o(■_d~o)→P过程是观测cp破坏的最有希望的反应道,观察到cp破坏需b对数甘为10~8。     

双口圆极化微带天线的CAD设计

介绍了应用Serenade和Ensemble软件进行微波电路计算机辅助设计的方法 ,并以双口圆极化微带天线为例 ,讨论了电路的设计过程和设计结果     

基于DELPHI的定量注射器检定装置

目前国内还没有专业的定量注射器检定装置,基本都依靠国外进口来实现,但进口设备相当昂贵,大大增加了检定成本。针对这种情况,本文基于DELPHI语言,利用赛多利斯高精度电子天平CP225D,并通过串行通信的方式,开发研制了一种集设置、采集、导出于一体的定量注射器检定装置。系统测试结果表明,本装置操作简便,性能稳定,数据可靠,符合检定要求。     

一类正线性映射的可分解性

定义线性映射Ф=φ1φ2:M2(C)M2(C)→M2(C)M2(C)为Ф(AB)=φ1(A)φ2(B),A,B∈M2(C),其中φi(i=1,2)为M2(C)到M2(C)上的线性映射.证明了正线性映射Ф=φ1φ2是可分解的,并给出了co-全正映射的一个充分必要条件.     

Multi-polarization reconstruction from compact polarimetry based on modified four-component scattering decomposition

An improved algorithm for multi-polarization reconstruction from compact polarimetry （CP） is proposed. According to two fundamental assumptions in compact polarimetric reconstruction, two improvements are proposed. Firstly, the four-component model-based decomposition algorithm is modified with a new volume scattering model. The decomposed helix scattering component is then used to deal with the non-reflection symmetry condition in compact polarimetric measurements. Using the decomposed power and considering the scattering mechanism of each component, an average relationship between copolarized and crosspolarized channels is developed over the original polarization state extrapolation model. E-SAR polarimetric data acquired over the Oberpfaffenhofen area and JPL/AIRSAR polarimetric data acquired over San Francisco are used for verification, and good reconstruction results are obtained, demonstrating the effectiveness of the proposed algorithm.