The large deviation results for the nonlinear regression model with dependent errors

In this paper, we investigate the least squares (LS) estimator of the nonlinear regression model based on the extended negatively dependent errors which are widely dependent structures. Under the general conditions, we establish some large deviation results for the LS estimator of the nonlinear regression parameter, which can be applied to obtain a weak uniform consistency and a complete convergence rate for this estimator. In addition, some examples and simulations are presented for illustration.     

认知网络中的能量回收技术：性能分析及优化设计

通信网络中有限的能源和频带资源限制了网络容量的进一步提升.对能量回收技术在认知网络中的应用进行研究,量化评估用户可回收的能量以及可达吞吐率,并进行优化设计很有必要.在所分析的系统中,当授权用户进行通信时,非授权用户可回收无线信号中所带有的能量,并利用回收的能量进行频谱检测;当检测到授权用户空闲时,非授权用户将接入频谱,利用回收到的能量进行数据传输.采用马尔科夫链模型对通信场景进行描述分析,发现授权用户的活跃程度对非授权用户可回收的能量、获得的传输机会带来影响,进而决定了非授权用户的可达吞吐量.在此基础上,提出一种通过控制授权用户业务量,以最大化网络能量效用和频谱效用的优化方案,并通过仿真证实了理论分析的正确性.     

Integrated Evaluation of Water Quality and Quantity of the Yellow River

Abstract

This study presents an integrated water quantity and quality management method for the entire Yellow River system where the eco-environment has been deteriorating and water quantity is very scarce. The supply and demand of water resources has been investigated. The integration of the concepts of water resources functional capacity and water resources functional deficit have been put forward, and their characteristics have been analyzed. The results, based on 1997 to 1999 data, indicate that approximately 39 percent of the total river length was of excellent to good quality, 26 percent was moderate, and 35 percent was poor to very poor. The total natural runoffs of the river were 31.8, 43.9, and 43.4 billion m3, and about 94, 65, and 71 percent of them were withdrawn for agricultural, industrial, and domestic uses in 1997, 1998, and 1999, respectively. The total water resources availabilities were 21.1, 28.8, and 29.2 billion m3 occupying about 66, 66, and 67 percent of the total runoffs in 1997, 1998, and 1999, respectively. From 1997 to 1999, the river could provide only 53 percent (on average) of the total water resources demand for the uses and discharge to the Bohai Sea; about 57 percent of the water deficiency resulted from pollution and 43 percent from quantity deficit. For the main pollution parameter (COD _Mn ), the averages of water resources functional capacity and deficit were 29,571.54 and 199.70 kg, respectively; for NH ₄-N, the averages of water resources functional capacity and deficit were 3774.26 and 113.08 kg, respectively. These demonstrated that the influence of NH ₄-N on water resources availability was more than that of COD _Mn and that the functional capacity was much higher than functional deficit, suggesting that the actual water quality was mostly better than the required one for water supply functions.     

智能型低压电动机保护装置的研究与设计

针对低压电动机运行中出现的各种电气故障,结合电动机保护的现状,设计了一种智能型低压电动机保护装置。该装置以ARM处理器LM3S2B93为主控芯片,可以实时采集电动机的三相输入电压、电流信号,对电动机进行启动超时、堵转、电流不平衡和过热等保护。对装置的总体设计、部分硬件电路、主程序和典型应用进行了分析,并给出了装置的测试和检验结果。该装置具有结构简单、操作方便、可普及性高等特点,具有较高的应用价值。     

矿井通风风阻与风机工作效率研究

在测定系统阻力的基础上,根据矿井通风系统的实际情况,对矿井通风系统的稳定性进行了分析.以风机的转速、风机的风量、风机的效率三者为切入点,探究大气压力与风机的性能的相关性,提出了矿井通风阻力的实际分布规律,为矿井通风设计、通风系统改造、风压调节和矿井消防提供可靠的理论依据,提出了加强矿井通风系统优化工作,以及改善通风系统工况的相关建议.     

PCCP管道阴极保护试验研究

PCCP管钢筋腐蚀过程是电化学过程,阻止腐蚀过程最直接的方式就是阴极保护。同时阴极保护技术与涂层保护相结合使工程更加经济,采用阴极保护所带来的经济效益非常显著。本文针对大伙房水库输水工程(二期)PCCP管道,通过智能化监测系统连续的监测,综合多种因素实现了对混凝土中自然状态下的钢筋腐蚀状态进行评估。     

银系复合抗菌剂的制备及性能研究

通过向硅溶胶中加入Ag+或Ag+/Zn2+制备了复合银系抗菌剂,并对所得样品进行了XRD和抗菌性能分析,结果表明向体系中添加Zn2+后,抗菌剂的抗变色性能明显提高,同时保持了较理想的抗菌性能,经1000℃处理3h,仍保持对大肠杆菌和金黄色葡萄球菌具有100%的抗菌效果。     

退火对冶金法太阳能级多晶硅中缺陷影响的研究

研究了不同条件下退火对冶金法太阳能级多晶硅锭不同部位的位错、晶界及择优生长取向的影响。利用金相显微镜,电子背散射衍射和X射线衍射仪分别对退火前后多晶硅锭的位错、晶界和择优生长取向的变化规律进行表征,结果表明:退火前后多晶硅中的位错密度大小始终是中部<底部<顶部。1100℃下随着保温时间的延长,多晶硅中的位错密度逐渐减小,到5.0h后达到回复的极限程度;小角度晶界比例不断减小,直至消失;大角度晶界中R型晶界比例先增加后减小,CSL晶界比例缓慢增加,孪晶晶界Σ3比例呈稳定地增加,到退火5.0h后,其比例约占30%;主峰〈111〉织构峰强一直增加,〈311〉织构峰强则是逐渐减小至零,而〈511〉、〈531〉、〈620〉织构强度则是先减小、后增大、最后再减小,退火保温5.0h后择优生长取向达到高度一致。另外,还得到了不同温度下的极限回复程度。     

基于软总线多传感器组合导航试验平台研究

在分析软总线结构特点的基础上,针对多种传感器组合导航中各类传感器的特征和应用特点,提出基于软插件／软总线结构的多传感器组合导航试验平台的结构模型,构建传感器分类软插件模型,将软总线技术用于组合导航试验仿真环境中,为“软插件”集成提供一个一致的平台,通过统一的接口规范实现异构导航传感器插件的即插即用,讨论了基手软总线组合导航试验系统的构架和实现方法。．-