复亚半正定矩阵

给出了复亚半正定矩阵的概念，研究了它的基本性质及行列式理论，将Hermite阵的Schur定理，华罗庚定理，Minkowski不等式，凸性不等式，Ostrowski-Taussky不等式推广到了较广泛的复矩阵类，扩大了Minkowski不等式的指数范围，削弱了华罗庚不等式的条件。     

对车险改革后保险营销的浅析

在车辆保险条款费率改革之后的车险市场上,现实状况却与预计效果相差甚远。其主要原因是,对保险营销战略的忽视,没有以相应的保险营销战略为指导,使得营销战术在操作过程中显得盲目而跟从。针对以上问题,我们首先要做的是树立正确的保险营销观念,即重新审视营销战略在车辆保险中的作用,并在此基础上建立广义的产品观念;同时注重服务在车险营销中的作用;有效地进行市场细分和市场选择;最后对车险营销战略的具体实施即营销战术提出建议。     

模糊集的无穷扩展原理

从普通集族{Xt}t?T（T为无限集）的直积Ⅱt?TXt出发，给出模糊集族At?F(Xt)(t?T)的直积概念；将通常的映射?：Ⅱt?TXt→Y扩展为模糊集族的直积Ⅱt?TF(Xt)到Y上的模糊集F(Y)的映射。     

Statistical Distributions of Daily Breathing Rates for Narrow Age Groups of Infants and Children

Children may be more susceptible to toxicity from some environmental chemicals than adults. This susceptibility may occur during narrow age periods (windows), which can last from days to years depending on the toxicant. Breathing rates specific to narrow age periods are useful to assess inhalation dose during suspected windows of susceptibility. Because existing breathing rates used in risk assessment are typically for broad age ranges or are based on data not representative of the population, we derived daily breathing rates for narrow age ranges of children designed to be more representative of the current U.S. children's population. These rates were derived using the metabolic conversion method of Layton (1993) and energy intake data adjusted to represent the U.S. population from a relatively recent dietary survey (CSFII 1994–1996, 1998). We calculated conversion factors more specific to children than those previously used. Both nonnormalized (L/day) and normalized (L/kg-day) breathing rates were derived and found comparable to rates derived using energy estimates that are accurate for the individuals sampled but not representative of the population. Estimates of breathing rate variability within a population can be used with stochastic techniques to characterize the range of risk in the population from inhalation exposures. For each age and age-gender group, we present the mean, standard error of the mean, percentiles (50th, 90th, and 95th), geometric mean, standard deviation, 95th percentile, and best-fit parametric models of the breathing rate distributions. The standard errors characterize uncertainty in the parameter estimate, while the percentiles describe the combined interindividual and intra-individual variability of the sampled population. These breathing rates can be used for risk assessment of subchronic and chronic inhalation exposures of narrow age groups of children.     

试论饭店体验服务产品及其开发

随着体验经济时代的到来,饭店体验服务产品应运而生,给饭店业带来了新的商机,着重论述饭店体验服务产品的产生背景,产品的种类、特性及其开发策略。     

宋明理学与中华民族精神

宋明理学是中国古代社会后期别具特色和风格的哲学思维形态。它被统治阶级奉为官方哲学,长达六七百年之久,支配着我国经济、政治以及文化思想的发展。由于它构建了一套严谨的极具思辨性的理论体系,把先前儒家所提出的伦理纲常上升到宇宙本体论的高度,从而强化了爱国主义,反映了时代的共同价值取向,提升了中华民族对于崇高精神境界的追求,正是这些承担并体现了形成与发展中的中华民族精神,是锤炼和塑造当代中华民族精神的文化土壤。     

对第二语言习得中“年龄小优势论”的辩证分析

多数人认为:在第二语言习得过程中,年龄小的人比年龄大的人学得好;儿童比成年人学得好。通过对大量的有关年龄因素如何影响"第二语言习得"(SLA)的资料的辩证分析,肯定了在自然条件下,就语音和语法方面而言,年龄越小,学得越好,但年龄大的人在读写方面的优势以及成年人比儿童能够更快地习得第二语言语法的事实证明了:在"第二语言习得"中,年龄小的人并非总是比年龄大的人学得好,从而论证了"年龄小优势论"具有一定的片面性。     

袁宏道文学思想再认识

明中叶以后 ,以公安三袁为主力的公安派高举“性灵”大旗 ,开创了与“复古”论调大相径庭的一代风气 ,影响甚大。而公安三袁中尤以袁宏道为重 ,袁宏道的文学思想表现在三个方面 :一、识时通变的文学发展观 ;二、“独抒性灵”的创作主张 ;三、“本色轻淡”的艺术趣味。     

煤炭资源产权、产品市场协调机制与供应安全

明确了研究煤炭资源产权、产品市场协调与供应安全的背景和意义,辨识了煤炭资源供应安全的概念、内涵及表现形式。提出了实现煤炭资源供应安全的途径,即完善煤炭资源产权和产品市场之间的协调。然后,从加强煤炭资源产品市场建设、推进煤炭资源产权市场建设、建立国家煤炭资源战略储备机制,以及引导和控制煤炭进出口、实施"走出去"战略等方面,对保障煤炭资源供应安全的措施进行了讨论。