流动单元划分方法的讨论与研究

针对流动单元划分方法不断发展过程中流动层带指标法和孔喉半径r35法可能存在的弊端，通过深入研究这两种方法所表达的内在含义，发现它们都是从岩石微观孔隙结构出发，以孔喉的大小对流动单元进行分类和评价，是同一物理性质的不同表达形式。同时，由于它们只反映了储层的一个物理因素，势必导致用这两种方法划分流动单元具有局限性。从流动单元的概念出发，提出只有从连续（通）性、相似性和独立性三个方面对流动单元进行划分和评价，才能准确有效地对储层进行评价。     

Comments on estimators based on error in the predicted distribution function

In estimation of percentiles in the exponential distribution, the distribution function evaluated at the estimated percentile is often evaluated for purposes of warranty considerations. Optimal estimators are discussed and compared on their error in the predicted distribution function. Inconsistency is shown to exist between measures of closeness and measures of risk in the predicted distribution function. An optimal estimator based on absolute loss in the predicted distribution function is obtained and shown to be superior in measures of closeness to the optimal estimator, which minimizes squared error loss in the predicted distribution function.     

Constructing an alternative family unit: families living with HIV/AIDS redefine African traditional parenting patterns

This article is based on a study, conducted at Inanda, of caregivers who mainly take care of children that are infected and/or affected by HIV/AIDS. ¹ 1. The discussion of this article emanates from a three‐year‐long study that focused on the after‐effects of HIV/AIDS. Six participants from 15 in‐depth interviews are used for the focus of the article. Based on recurring similar characteristics, the other nine participants were excluded. All the participants of the study were Zulu speakers, one of the main languages of the country. I use fictitious names to conceal their identities. It explores the reality and experiences of the family members. The focus of the article is based on data analysed following interviews with the caregivers. Family parenting experience portrays HIV/AIDS caregiving as an intense, emotional and powerful experience, filled with pride and hope as well as exclusion. Findings of the study reflect a change in the definition and practice of parenting. Another finding is that HIV/AIDS is forcing a redefinition of the concept and practice of parenting beyond the traditional boundaries of age, sex and gender. One of the main findings of the study was that the respondents' parenting practices and coping strategies are largely influenced by a strong commitment to the wellbeing of the children. The study found that, in relation to some community members, the respondents have a different parenting style. Their commitment depicts their self‐sacrifice, an indication of some continuity in what is expected of African parenting practice. The thesis of this article is that the HIV/AIDS context is principally responsible for a shift in the understanding of the concept and practice of parenting within an African context.     

Estimation of Nonparametric Conditional Moment Models With Possibly Nonsmooth Generalized Residuals

This paper studies nonparametric estimation of conditional moment restrictions in which the generalized residual functions can be nonsmooth in the unknown functions of endogenous variables. This is a nonparametric nonlinear instrumental variables (IV) problem. We propose a class of penalized sieve minimum distance (PSMD) estimators, which are minimizers of a penalized empirical minimum distance criterion over a collection of sieve spaces that are dense in the infinite‐dimensional function parameter space. Some of the PSMD procedures use slowly growing finite‐dimensional sieves with flexible penalties or without any penalty; others use large dimensional sieves with lower semicompact and/or convex penalties. We establish their consistency and the convergence rates in Banach space norms (such as a sup‐norm or a root mean squared norm), allowing for possibly noncompact infinite‐dimensional parameter spaces. For both mildly and severely ill‐posed nonlinear inverse problems, our convergence rates in Hilbert space norms (such as a root mean squared norm) achieve the known minimax optimal rate for the nonparametric mean IV regression. We illustrate the theory with a nonparametric additive quantile IV regression. We present a simulation study and an empirical application of estimating nonparametric quantile IV Engel curves.     

试论语文教育的传承与借鉴

正确处理传承与借鉴的关系,是我国语文教育在长期实践中遇到的一个重要问题,直接影响到语文教育的改革与发展。语文教育不仅需要传承,而且需要借鉴。要在传承中借鉴,在传承的基础上借鉴。借鉴的目的在改造自己,借鉴的手段是借镜精华,借鉴的方法是比照实际,借鉴的前提是立足传承,借鉴的效果要达到改造创新。语文教育既要积极借鉴,又要审慎借鉴。第一,明确民族母语教育的特殊性。第二,守护语文教育改革的本土性。第三,坚持语文教育借鉴的审慎性,思想上要明确理念,内容上要细加鉴选,推行上要稳健扎实,结果上要卓有成效。     

实数连续性的八个等价命题

叙述常见的八种形式的连续性定理,并给予环状证明,从而说明这八个定理是彼此等价。     

对角型蜕化椭圆组解的处处Hlder连续性

在G考虑一类对角型蜕化椭圆组，它的最高项系数矩阵的特征值正比例于未知解的模的正幂次。证明在和一致椭圆组同样的小性条件下方程组的有界连续解在G内的Holder连续性。     

2n阶J-自伴向量微分算子的预解算子及其谱

采用分析的方法,给出2n阶J-对称向量微分算式所生成的J-自伴向量微分算子在正则情形时的预解算子,得到其预解算子是积分算子及预解算子的核(Green函数)的一些基本性质;然后,从预解算子的全连续性证得:在正则情形下,其谱是离散的.     

利用Riemann函数构造的两种反例

利用Riemann函数构造的两种新函数,反驳了有关函数连续、可导的两个错误命题。     

中国文化延续中的地理环境保护机制

中国是世界四大文明古国之一,也是世界文化发展史上唯一未因外族入侵而导致文化发展中断的国家,中国文化的延续性除了中国文化自身的内聚力外,根本因素在于中国文化所诞生的地理环境的保护机制:条件优越的农耕世界为中国文化发展的连续性提供了物质基础;辽阔的文化地域,使得中国文化有足以回旋的余地和应付环境变迁的能力;地理环境的偏远、封闭免除了中国文化遭受其他文明的冲击,保证了文化发展的连续性。