扩散先验分布下Bayes多总体分类判别方法的构造

本文研究了各总体服从多元正态分布 ,其未知参数的先验分布均为扩散先验分布时 ,如何利用待判样品的预报密度函数、构造后验概率比并据此对样品进行分类与判别 ;此方法并不需要假设各总体分布的协方差相同 ,而且在预试样本容量较小时仍然可行。     

基于标准差和平均差的权系数确定方法及其应用

本文以工业经济效益的综合评价为应用背景 ,提出了一种确定多指标决策权系数的新方法———标准差和平均差极大化方法。运用该方法进行多指标决策和评价 ,概念清楚、涵义明确 ,决策和评价结果准确、可信、不具有主观随意性     

硝基甲苯类炸药C-NO2键中点的静电势

利用HONDO程序包,采用从头计算法对硝基甲苯类炸药的分子结构及其C-NO2键中点的静电势进行了计算,讨论了硝基甲苯类炸药C-NO2键中点的静电势最大值Vmidmax与其实验撞击感度之间的关系.研究表明:对于硝基甲苯类炸药,可用其分子C-NO2键中点的静电势最大值Vmidmax来确定其撞击感度的变化趋势.以静电势为判据,讨论了硝基和甲基数目以及硝基和甲基的相对位置对这类炸药撞击感度的影响.     

ON THE DISTRIBUTION OF RANDOM LINES IN THE GENERAL CASE

$L$ is a line in a plane through the origin, with an angle $\[\alpha \]$ to the $x$-axis,$\[0 < \alpha < \pi \]$.$M$ is a point process on positive $x$-axis, Through the nth point of $M$ draw a line with a random angle $\[{\theta _n}\]$ to $x$-axis, $\[{\varphi ^ + }\]$ is the set of intersections of those lines with $\[{L^ + }\]$. Let $\[m = EM\]$. If, for every $\[c > 0\]$, then $\[{\varphi ^ + }\]$ is locally finite on $L$, and let $\[\tilde M\]$ be the point process constructed by $\[{\varphi ^ + }\]$ , then $\[E\tilde M\]$ exists. If, for all interval $\[L \subset {L^ + }\]$, $\[\int_0^\infty {r(I,x)M(dx)} = \infty \]$ then $\[{\varphi ^ + }\]$ is dense on $\[{L^ + }\]$. If $L$ is drawn parallel to $x$-axis,. the same results can be got，and this time $\[\tilde M\]$ is a cluster point process with cluster center $M$.     

基于小波变换的LMSV模型对人民币汇率波动的研究

将小波引入到LMSV模型波动长记忆性的估计与检验中,提出了基于小波变换的LMSV模型波动长记忆性的伪极大似然估计法和波动长记忆性的检验方法,并对各汇率波动序列长记忆效应的大小程度进行了验证．结果表明各汇率波动序列存在长记忆效应．人民币对美元的汇率波动序列受历史信息的影响程度最高．     

高温超导电缆直流测试电源平台的搭建

根据高温超导电缆测试用直流电源平台的要求,建立了硬件平台。该平台为模块化结构,具有输出精度高,便于扩展等特点;为方便操作,建立了基于LabVIEW的软件平台,对直流电源平台进行远程控制,并给出了远程控制的程序流程图,实现了电流的匀速上升和下降以及上升过程中的中断操作;利用该电源平台进行了超导电缆的临界电流测试实验,验证了直流电源平台符合高温超导电缆的测试要求。     

风险规避和最优套期保值比率

在一般的期望效用框架下,研究投资者的风险厌恶态度对于其套期保值策略的影响.首先,给出了投资者采用不同套期保值策略时,效用函数应该满足的条件;其次,讨论了期望效用框架下,Rubinstein整体风险厌恶度量与经典的Arrow Pratt局部风险厌恶度量和更强的Ross的风险度量之间的关系,提出了一组条件,使得在该组条件下,风险厌恶的人际间比较可以用Rubinstein整体风险厌恶度量来刻画;最后,在现货和期货服从正态分布的假设下,使用之前提出的条件,研究投资者风险厌恶程度对于其持有的最优套期保值比率的影响.     

ChemInform Abstract: Theoretical Study on the Assembly and Stabilization of a Magic Cluster Al4N‐

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.     

流体化学在对羟基苯乙酮合成中的应用

以苯酚为原料,采用流体化学技术,依次经醋酐酯化和酸催化Fries重排反应合成了对羟基苯乙酮,其结构经¹H NMR, ¹³C NMR和MS(ESI)确证。使用流体化学反应技术合成对羟基苯乙酮具有操作简便、反应选择性好和产品收率高等优点。     

Porous carbon nanospheres with moderately oriented domains for EDLC electrode

Porous carbon nanospheres with moderately oriented microcrystalline structures were prepared via a relatively simple synthetic route in this article. CTAB acted as a structure‐directing agent to induce small sulfonated pitch (SP) pieces to assemble orderly. By this means, the formation of carbon nanospheres was simultaneous with the moderate orientation of carbon microcrystalline without additional process. Owing to the moderately oriented microcrystalline structures, the resultant sample CNS3 possessed a high e‐conductivity of 62.5 S/m. When used as an electrode material for EDLCs, it showed excellent electrochemical properties even without any conductive agent. In an organic electrolyte, the resultant sample CNS3 possessed a high specific capacitance of 155 F/g at 20 A/g and outstanding cycle life with 94.2% capacity retention after 10,000 cycles. This work puts forward a novel design for carbon nanospheres with moderately oriented domains by a simple and energy‐efficient means.