一种基于最大熵的构件库动态存储方法

本文依照ALOAF构件库框架参考模型，首先给出构件库的形式化描述；然后，根据构件库框架的元模型以及相应的数据模型，确定构件在构件库中的存储方式；进而，提出了一种基于最大熵的构件库的动态存储方法，概括为分类、模糊聚类、划分和排序。此方法改变了传统构件库的静态组织形式．基于最大熵的构件块划分、基于贝叶斯方法的构件动态排列和淘汰机制使构件库的存储更加合理。     

Re-Entry trajectory tracking via an inverse dynamics method

Atmospheric Re-Entry guidance is divided as longitudinal and lateral. This paper proposes a longitudinal reference trajectory and control law using the inverse dynamics method with pseudospectral Legendre method. Application of this method into Re-Entry problem forces a power of calculation time-reduction due to unnecessary of integration or any iteration as well as sufficient accuracy convergence. The used guidance scheme is time-to-go.     

定位元件制造误差对定位精度影响的探讨

本文通过对零件安装实例的分析计算，得出定位零件制造误差对定位精度影响的诸因素。并就同一工序中夹具的使用情况进行讨论，认为当使用单套夹具时，定位元件误差是其制造允差范围内的一个定值；当使用多套夹具时，应考虑定位元件制造允差范围内两个极限状态对定位精度的影响。     

Electrochemical formation of Au2Na alloy and the characteristics of (Au2Na+Au) reference electrode in a LiF–NaF–KF eutectic melt

A cyclic voltammogram at a Au electrode in a LiF–NaF–KF eutectic melt at 773 K showed a cathodic peak at 0.45 V (vs. K⁺/K). XRD analysis of the electrode confirmed that the cathodic peak corresponded to the formation of Au₂Na alloy phase. The equilibrium potential of the reaction: 2Au+Na⁺+e⁻Au₂Na was determined to be 0.535 V at 773 K by open-circuit potentiometry at the Au–Na alloy electrode. The thermodynamic properties including the standard Gibbs free energy of formation were estimated for Au₂Na alloy at 773–860 K. The (Au₂Na+Au) electrode was proved to have excellent characteristics as a reference electrode in terms of reproducibility, stability and reversibility.     

The effect of demand response on electricity consumption under the existence of the reference price effect: Evidence from a dynamic pricing experiment in Japan

This paper investigates the effect of demand response on households’ electricity consumption under the existence of the reference price effect. The reference price effect is observed in peak and shoulder hours. Consistent with reference price theory predictions, our results show that the reduction of electricity consumption is greater in the case where the current price is higher than the previous price than in the case where the current price is lower than the previous price.     

结合丙烯腈标准物质不确定度的分析评定

以丁腈橡胶为结合丙烯腈含量标准物质定值样品,对结合丙烯腈含量测量不确定度的来源进行了分析和评定。结果表明,影响丁腈橡胶结合丙烯腈含量标准物质不确定度的因素主要有样品均匀性、样品稳定性和各实验室定值结果的重复性。经过评定,丁腈橡胶结合丙烯腈含量标准物质测定的不确定度为0.26%,标称值为29.1%±0.26%。     

Poultry marketing controls – Inter-laboratory validation of a method to detect previously frozen chicken breasts by determination of HADH activity

EU poultry marketing legislation requires that poultry be marketed either as fresh (chilled) poultry or as frozen (or quick-frozen) poultry. It is not permitted to market poultry which has been previously frozen as if it were fresh. A robust analytical method that is capable of distinguishing between fresh and previously frozen poultry is therefore required for the enforcement of the legislation. A method to detect whether poultry and other meats have been previously frozen was developed and validated by an earlier collaborative study in 1997. The method is based on measuring the HADH activity of intracellular juice pressed from the test samples. The ratio of the HADH activity of sub-samples tested before and after laboratory freezing is compared to a reference cut-off limit, to determine whether the sample has previously been frozen. In a subsequent study in 2010, improvements were made to the analytical procedure and a revised cut-off limit for chicken of 0.5 was determined. The aim of the current study was to validate the improved analytical procedure and the revised cut-off value for chicken via a collaborative trial with 12 European NRLs and 12 UK OCLs. Each laboratory was asked to analyse 24 chicken breast samples and to use the results to determine their thermal history (chilled or previously frozen) according to the SOP provided. All samples were supplied as chilled blind samples. The results of the study showed inter-laboratory variation between the results obtained for chilled and for previously frozen chicken breasts, however despite this, almost all of the samples were correctly identified and reported in terms of their thermal history. Although some reduction in the analytical variability of the method would be beneficial, the results confirmed the suitability of the method and the revised cut-off limit of 0.5 for the official control of marketing of chicken breasts within the EU.     

毫米波磁控管漏脉冲测试仪的研制

讨论了毫米波磁控管漏脉冲测试原理、实现及方法改进。根据毫米波磁控管的特点，采用了硬件计数和能量积分电路解决了窄脉冲高重复频率的磁控管漏脉冲测试。本文提出的用精密衰减器来校准检波器的非线性的方法，使仪器的测试精度大为提高，实践表明本仪器工作稳定，操作简便，符合用户要求。     

Volume rendering for vector fields

The visualisation of vector fields usually proceeds via geometric forms, such as arrows or streamlines. This paper describes an effective method for volume rendering vector fields in which vectors are assigned colour using a perceptually based colour map. The method is capable of displaying vector fields sampled at voxel rates in three dimensions. This is in contrast to geometric methods that require much lower sampling densities. The approach described automatically colour codes the local field attributes, such as critical points, and enables their emphasis via data windowing techniques. Case studies using gravitational fields and computational fluid dynamics demonstrate the method.