Kinetic analysis of TG data XXXVI: Influence of procedural variables upon the apparent kinetic parameters of the thermal deamination

A number of 7 complexes of the [Co(DH)₂(amine)₂)]I type (DH₂ stands for dimethyloxime) have been studied by means of thermogravimetry and differential scanning calorimetry in nitrogen atmosphere, by using heating rates of 2.5, 5 and 10 K min^–1. In all cases an endothermal deamination reaction occurs leading to the relatively stable [Co(DH)₂I(amine)] intermediate. For this reaction apparent kinetic parameters have been derived. The influence of heating rate is discussed. The validity of a linear and a non-linear kinetic compensation law was verified.This revised version was published online in November 2005 with corrections to the Cover Date.     

Time-critical interactive dynamic influence diagram

Multiagent time-critical dynamic decision making is a challenging task in many real-world applications where a trade-off between solution quality and computational tractability is required. In this paper, we present a formal representation for modelling time-critical multiagent dynamic decision problems based on interactive dynamic influence diagrams (I-DIDs). The new representation called time-critical I-DIDs (TC-IDIDs) represents space-temporal abstraction by providing time-index to nodes and the model is defined in terms of the condensed and deployed forms. The condensed form is a static model of TC-IDIDs and can be expanded into its dynamic version. To facilitate the conversion between the two forms, we exploit the notion of object-orientation design to develop flexible and reusable TC-IDIDs. The difficulty on expanding TC-IDIDs is to select a proper time sequence to index nodes in the condensed form so that the expanded TC-IDIDs can be solved efficiently without compromising the quality of the policy. For this purpose, we propose two methods to build the condensed form of TC-IDIDs. We evaluate the solution quality and time complexity in three well-studied problems and provide results in support.     

基于统计变点检测的国际天然铀价格影响因素分析

铀资源是军民两用的重要战略资源,有必要研究其价格变化为政府决策提供依据.采用基于Schwarz信息准则的统计变点检测方法,识别出1990-2013年国际天然铀价格的多个均值-方差变点,据此将国际天然铀价格的变化分为稳中下降期、大幅上扬期、震荡回归期和持续下降期四个阶段.研究结果表明,核事故、二次铀源、核电政策是影响国际天然铀价格的重要因素,同时天然铀逐渐显示出其商品的属性,其价格受供需关系的影响明显.     

右随机截断下混合分布系数的非参数推断

对于混合分布模型$H=\lambda F+(1-\lambda)G$, 构造了在右随机截断下混合分布系数$\lambda$的估计量$\wh{\lambda}$, 并证明了$\wh{\lambda}$的渐进正态性.     

APPROXIMATION PROPERTIES OF LAGRANGE INTERPOLATION POLYNOMIAL BASED ON THE ZEROS OF （1- x^2）cosnarccosx

We study some approximation properties of Lagrange interpolation polynomial based on the zeros of （1-x^2）cosnarccosx. By using a decomposition for f（x） ∈ C^τC^τ＋1 we obtain an estimate of ‖f（x） -Ln＋2（f, x）‖ which reflects the influence of the position of the x＇s and ω（f^（r＋1）,δ）j,j = 0, 1,... , s,on the error of approximation.     

How does the pH influences the Ru-NO coordination compounds?

The pH influence has important role in the bioavailability of coordination compounds. fac-[Ru(NO)Cl₂(κ³N⁴,N⁸,N¹¹[1-carboxypropyl]cyclam)]⁺, 1 , and the species found at different pHs, 2 - 4 , were investigated. One series of computational methodologies has been used to investigate these compounds. One special highlight is to interacting quantum atoms method, where the total interaction energy, , between two atoms has been used as base to estimate the chemical bonds strength. The deprotonation of -CO₂H, 1 ➔ 2 (pK_a = 3.3), creates a hydrogen bond in the complex 2 , N( 3 )-H⋯ ·OCO⁻, with a more favorable than the presents in 1 , N( 3 )-H⋯ ·OCOH. There are no changes in in Ru-NO bond. The second deprotonation occurs in the N(2) atom of the cyclam group, 2 ➔ 3 (pK_a = 8.0). It promotes an increase in the covalent character of Ru-N( 2 ). In contrast, there is no changes in Ru-N( 5 )O bond. For higher pHs, there is a 3 ➔ 4 equilibrium (pK_a = 11.5) and the conversion of Ru-N( 5 )O for Ru-N( 5 )O₂. The Ru-N( 5 ) of 4 shows a larger ionic character than 3 . Thus, Ru-NO in 1 - 4 has worthy stability about a large pH range, showing potential application as NO scavengers.     

早期护理干预在新生儿黄疸治疗效果的影响

目的探讨早期护理干预对新生儿黄疸治疗效果的影响。方法对照组患儿采取常规护理,实验组患儿采取早期护理干预。观察患儿胎便初排时间和胎便转黄时间;观察患儿干预前后血清胆红素、体质量变化情况。结果实验组患儿胎便初排时间和胎便转黄时间均低于对照组,差异有统计学意义(P0.05),实验组患儿干预后血清胆红素、体质量均优于干预前和对照组,差异有统计学意义(P0.05),对照组患儿干预后血清胆红素优于干预前,差异有统计学意义(P0.05)。结论早期护理干预对新生儿黄疸治疗效果有积极的影响,能够缩短患儿胎便初排时间和胎便转黄时间,改善患儿血清胆红素、体质量水平。     

适应于纵数据的随机效应模型中参数的局部影响诊断

本根据纵数据既包含个体又包含个体不同状态的特点，针对适应于纵数据的随机效应模型提出两种便于合理分析数据的扰动方案，并给出扰动对参数估计局部影响的各种计算公式和寻找影响点的方法。通过对Ｃａｍｂｒｉｄｇｅ过滤嘴中提取尼古丁含量的实验室间数据进行分析表明我们的分析结果不但包含了以前许多学用不同的方法对这组数据所进行的所有有关影响点方面的分析结果，而且还获得了一些新的结果。     

Developing a unified FVE‐ALE approach to solve unsteady fluid flow with moving boundaries

In this study, an arbitrary Lagrangian–Eulerian (ALE) approach is incorporated with a mixed finite‐volume–element (FVE) method to establish a novel moving boundary method for simulating unsteady incompressible flow on non‐stationary meshes. The method collects the advantages of both finite‐volume and finite‐element (FE) methods as well as the ALE approach in a unified algorithm. In this regard, the convection terms are treated at the cell faces using a physical‐influence upwinding scheme, while the diffusion terms are treated using bilinear FE shape functions. On the other hand, the performance of ALE approach is improved by using the Laplace method to improve the hybrid grids, involving triangular and quadrilateral elements, either partially or entirely. The use of hybrid FE grids facilitates this achievement. To show the robustness of the unified algorithm, we examine both the first‐ and the second‐order temporal stencils. The accuracy and performance of the extended method are evaluated via simulating the unsteady flow fields around a fixed cylinder, a transversely oscillating cylinder, and in a channel with an indented wall. The numerical results presented demonstrate significant accuracy benefits for the new hybrid method on coarse meshes and where large time steps are taken. Of importance, the current method yields the second‐order temporal accuracy when the second‐order stencil is used to discretize the unsteady terms. Copyright © 2009 John Wiley & Sons, Ltd.     

非线性过程控制系统传感器故障检测新方法

针对电厂热力系统故障检测和定位准确性低的问题,提出了基于鲁棒输入训练网络(Robust Input-training Network, RITN)的传感器故障检测模型。采用带参数限制项的目标函数对网络进行训练,并在测试目标函数中引入影响因子,增加了模型训练精度,抑制了网络计算过程故障数据对正常值的影响,减小了残差污染,提高了模型准确性。以某300MW电厂热力系统20组测点为对象进行算例分析,通过反复的实验,结果表明,该模型能够更加准确的对非线性系统故障点进行检测和分离,并更加精确重构各变量真实值,验证了该模型用于非线性过程传感器故障检测的有效性和可靠性。