中国钢材市场分析及2010年预测

通过对中国钢铁工业钢材生产、进出口贸易及消费现状进行深入分析,根据中国宏观经济发展走势、相关产业政策,及其对下游主要用钢行业的影响,分析预测了2010年中国钢材市场总体发展前景.     

Bayesian Inference in Cointegrated I (2) Systems: A Generalization of the Triangular Model

This paper generalizes the cointegrating model of Phillips (1991) to allow for I (0), I (1) and I (2) processes. The model has a simple form that permits a wider range of I (2) processes than are usually considered, including a more flexible form of polynomial cointegration. Further, the specification relaxes restrictions identified by Phillips (1991) on the I (1) and I (2) cointegrating vectors and restrictions on how the stochastic trends enter the system. To date there has been little work on Bayesian I (2) analysis and so this paper attempts to address this gap in the literature. A method of Bayesian inference in potentially I (2) processes is presented with application to Australian money demand using a Jeffreys prior and a shrinkage prior.     

硫化银与氰化钠反应研究

应用热力学原理和偶合反应的观点对硫化银溶于氰化钠的条件进行了讨论.     

CaTiO_3中Co~(2+)离子各向异性g因子的理论研究

利用基于离子簇模型的正交对称中3d7离子g因子微扰公式,计算了CaTiO3中Co2+的各向异性g因子gx、gy和gz,与此相关的晶场参量由杂质局部结构和重叠模型得到。研究发现,由于杂质Co2+与母体Ti4+存在电荷和离子半径的差异,将引起两个方向的键长发生5.6%的相对改变,从而导致明显的正交畸变。由此得到的g因子理论值与实验较为符合。     

Ca~(2 )和CaM在被子植物双受精中的作用

:本文从 Ca2 和 Ca M在花粉萌发、花粉管生长、生殖核分裂、助细胞退化及胚胎发育中的作用等几方面进行了综述     

WPKI在移动电子商务安全中的应用

PKI技术是各种安全解决方案的基础.WPKI是应用到无线网络中的PKI技术.WPKI必须对有线网络中的PKI进行优化和裁剪,才能适应无线网络的特点.本文简要介绍了PKI的技术背景和无线网络的特点,讨论了WPKI的关键技术,探讨了几种WPKI在移动电子商务安全中的应用模型.包括基于WAP的应用模型、基于STK的短消息应用模型和J2ME应用模型.     

二语写作认知心理策略研究

有关二语写作策略的研究始于上世纪80年代,但大多涉及跨语言性普遍策略,而缺少对外语写作者特别是中国学生的研究。考察不同二语水平的三组学生使用写作策略的情况发现,认知和元认知策略的使用构成了学生写作过程中的主要活动;英语水平越高,高频率使用的写作策略的数量就越少;在多数写作策略的使用上,组与组之间存在或递增、或递减、或先升后降、或先降后升的趋势。上述现象与研究性质、编码系统、母语思维、二语水平和写作教学现状等因素有关,这说明二语写作是个极其复杂的认知心理过程,写作策略的使用情况意味着写作过程的流畅与否,一定程度上预示着写作者是否已经跨过二语水平的门槛。     

Diabetes, aging and physical activity

Diabetes mellitus (DM) is a metabolic disease affecting the regulation of insulin and glucose causing a disruption in the normal control of counterregulatory hormones and macronutrients, resulting in blood glucose accumulation. Metabolic deregulation leads to the production of noxious substances that have a particular propensity for damaging vascular and nervous structures. Physiological changes observed with aging are correlated with a concomitant increase in DM and its associated complications. Long-term complications, including peripheral and central neuropathies, micro- and macrovascular damage, retinopathy, and nephropathy are the major causes of mortality in diabetics [cardiovascular disease (CVD) being the primary complication causing death in this population]. All-cause mortality is three to four times greater in the DM population; hence, management of DM is of timely importance, particularly with a projected prevalence increase of 134% within the next 25 years among individuals over the age of 65 years. Exercise modalities, including endurance and resistance training, were employed to improve glycemic/metabolic control and to ameliorate the progression of DM-related complications. Several risk factors, including glucose levels, blood pressure, lipid/cholesterol profile, and BMI, are reportedly improved with these modes of exercise. However, not all studies demonstrate an improvement in risk factors, but consistently note improvement in complications and a reduction of DM incidence. There is convincing evidence that exercise, with or without specific improvements to traditional DM-related risk factors, is an effective therapy for the management of DM.The Canadian Centre for Activity and Aging is affiliated with St. Joseph217;s Health Care and The University of Western Ontario, London, Ontario, Canada.