[[2n, n]] ADDITIVE QUANTUM ERROR CORRECTING CODES

The self-orthogonal condition is analyzed with respect to symplectic inner product for the binary code that generated by [B1 I B2 B3], where B, are the binary n x n matrices, I is an identity matrix. By the use of the binary codes that generated by [B1 I B2 B2 BT1], asymptotic good [[2n, n]] additive quantum codes are obtained.     

基于主成分分析法土地储备风险的定量评估

针对土地储备方案的风险评估,使用Excel对所给土地储备方案的相关数据筛选和处理,其次采取主成分分析、模糊C均值聚类分析和正态性检验等方法,建立了土地储备方案风险等相关的评价模型。运用Matlab编程,得到了主要通过建立风险评价指标来衡量土地储备方案的总风险,并确立相应的风险评价标准,得到了对土地储备风险进行有效评估的方法。     

统一混沌系统的输出反馈控制器设计

利用输出反馈研究了一类统一混沌系统平衡点渐进稳定问题.基于李亚普诺夫稳定理论,线性矩阵不等式方法及不等式技巧,分别用两输入单输出和单输入单输出反馈设计控制器,解决了状态不可测情况下统一混沌系统的控制问题.即使得混沌系统的状态渐进趋于给定的任一平衡点.与现有文献结果相比,所设计的控制器,反馈增益小,结构简单,保守性小.最后以Lorenz系统为例作了仿真,仿真结果表明了该控制器的有效性.     

非瑞利杂波中广义符号检测器的渐近性能

利用韦伯分布和对数正态分布两种非瑞利杂波模型,推导广义符号(GS)检测器相对于最佳线性参量检测器的渐近相对效率(ARE)计算公式.采用Monte Carlo法仿真广义符号(GS)检测器在非瑞利分布杂波背景下相对于最优线性检测器的渐近相对效率.雷达目标信号假定为非起伏,杂波的幅度包络满足韦伯分布和对数正态分布.渐进相对效率(asymptoticrelative efficiency,ARE)的仿真结果表明了广义符号检测器的有效性随着杂波分布偏离瑞利分布程度、采样参考单元的增加而增加.     

删失数据下一类回归模型的参数估计

考虑一类回归模型,在右删失数据下构造了参数的最小二乘估计和加权最小二乘估计,证明了估计量具有渐近正态性。模拟结果表明加权最小二乘估计比最小二乘估计有优良的性质。     

Multiscale modelling of the thermoelastic properties of alumina-zirconia ceramics for 3D printing

Additive manufacturing appears to facilitate the accurate manufacturing of alumina-zirconia technical ceramics. Nevertheless, the fine tuning of the manufacturing of these components by 3D printing requires an analysis of the parameters that influence their final thermoelastic properties. In this context, this work presents the application of (finite element-based) numerical procedures that aim at the prediction of the effective thermoelastic properties of 3D-printed alumina-zirconia ceramics. The numerical modelling considers three different scales: micro-, meso- and macroscale. The microscale corresponds to the microstructural level of, sintered at 1500 °$\mathrm{C}$, slip-casted samples with different compositions of alumina-zirconia. On the other hand, the macroscale corresponds to the macrostructural level of porous lattice of 3D-printed ceramics, being defined at the mesoscale level by a periodic unit cell. Thus, an initial microstructural analysis (at microscale level) provides the influence of the alumina/zirconia ratio on the (macroscopically homogeneous and isotropic) material thermoelastic properties, which together with the definition of the geometry of a periodic unit cell (at mesoscale level), provides, by a second analysis (at both the meso- and macroscale levels), the coupled influence of material and geometry of the macrostructural lattice on the structural (macroscopically heterogeneous and anisotropic) thermoelastic properties. Moreover, experimental thermoelastic properties of the sintered slip-casted specimens were obtained for several alumina/zirconia ratios and analysed together with microstructure patterns. Prediction of the microstructural effective thermoelastic properties was also made using micromechanics and composite theory (analytical) models. All the numerical, experimental and analytical results for the microstructural level are presented and compared. Numerical results for the meso- and macrostructural levels are also presented.     

Compaction and relaxation characteristics of single compacts produced from distiller’s spent grain

Compaction and relaxation characteristics of densified distiller’s spent grain compacts produced at different levels of compressive pressure (60.3–135.7 MPa), initial moisture content (15%, 20% and 25% wb) and soluble content (15% and 30%) were analyzed during the study. The compaction levels used in this study caused up to a 4% wb reduction in the moisture of compacts in comparison to their initial moisture. The density of compacts was analyzed to determine the compaction characteristics of distiller’s spent grain using Jones model. Analysis of the Jones model showed that there was a significant (P = 0.004) decrease in compressibility with an increase in soluble content from 0% to 30%. The distiller’s spent grain compacts were subjected to relaxation tests and the relaxation data obtained were normalized and analyzed to determine the asymptotic modulus (E_A) of the compacts. The asymptotic modulus was used as a measure of rigidity of the compacts. Distiller’s spent grain compact produced with a compressive force of 135.7 MPa and initial moisture of 25% wb possessed the highest E_A value.     

新常态下我国粮食质量安全问题研究

结合当前我国进入经济新常态的发展阶段,深入分析了粮食质量安全工作所面临的复杂的国际和国内形势及新要求,客观判断了我国粮食质量安全形势和潜在的风险和隐患。坚持问题导向,科学运用辩证思维、创新思维、战略思维和底线思维,研究解决粮食质量安全问题,从全面的、发展的、全局的视角出发,提出了具有可操作性的思路建议,以期我国粮食质量安全工作能够在提高监管能力上挖掘新潜力,在优化监管模式上开辟新途径,在促进农民增收上获得新成效,在保障粮食质量安全上迈上新台阶,为实现农业现代化、全面建设小康社会提供有力支撑。     

Valuing of timer path-dependent options

Timer options are financial instruments, first proposed by Société Générale Corporate and Investment Banking in 2007, which allow investors to exercise the options randomly under the level of volatility, unlike a vanilla style option exercised at a fixed maturity date. In this article, we study the problem of valuing the timer path-dependent options where the volatility is governed by a fast-mean reverting process. Specifically, extending and developing the study by Saunders (2010), we derive analytical formulas for path-dependent timer options by using the method of images as shown in Buchen (2001) and the technique of asymptotic expansions as described in Fouque et al. (2011). Moreover, we verify the pricing accuracy of the analytic formulas of path-dependent options by comparing our solutions with the ones from the Monte Carlo simulations. Finally, we experiment with the numerical studies on the timer-path dependent options to demonstrate the pricing sensitivities with respect to the model parameters.