Inference for the Extended Bifurcating Autoregressive Model for Cell Lineage Studies

Huggins & Basawa (1999) proposed several extensions of the bifurcating autoregressive model used to model cell lineage trees. These models overcame limitations in the original bifurcating autoregressive mode by allowing larger correlations between cousin cells and other cells in the same generation. Huggins & Basawa only considered maximum likelihood inference based on independent trees. This paper examines the asymptotic properties of maximum likelihood estimators based on a single large tree.     

麦冬块根、须根和水培诱导根细胞结构特性比较研究

采用组织切片技术,在显微镜下观察麦冬块根、须根和水培诱导根的形态和内部结构.研究麦冬块根、须根和水培诱导根的组织结构和细胞结构的差异.显微镜下的观察显示:在麦冬块根的皮层细胞中看到胶冻样特征性结构.麦冬须根的皮层薄壁组织之间排列着草酸钙针晶柱长链,须根的根尖区有密集的草酸钙针晶束结构;水培诱导根中没有发现草酸钙针晶束结构.水培诱导根的根毛与须根的根毛相比较,管腔内的无定型物质要比须根根毛少得多.研究结果表明:麦冬的块根从须根分化之后,在植物生理机理上与须根存在着差异性.正是这种机能差异,才形成了麦冬块根的药用有效成分的细胞生物学基础.草酸钙是由麦冬的须根根尖从土壤中吸收而来,或者是吸收了土壤中的钙离子,在根尖部位进行生化反应进行合成,再通过须根的皮层中央薄壁组织向上输送,途经块根有所残留.     

文化、心理与临床技术：灾后临床社会工作探索

临床社会工作是提供直接服务的专业方法,在5.12汶川大地震的灾后社区的社会重建中发挥了重要的作用.临床社会工作以促进与维持个人、家庭和团体的社会心理功能为目的,强调治疗、预防及"人在情境中"的概念,协助受灾的个人、家庭和团体,减轻其痛苦,改善其心理和社会功能.那么,从西方的社会文化价值理念和人文科学知识与技能发展而来的社会工作在中国社会运用时,中国传统文化及价值取向会对其有哪些积极影响,又会面临哪些困境呢?我们又将如何整合及发展本土化的临床社会工作实务技术呢?     

基于同质设备多台配置的独立生产单元构建决策

单元化生产作为一种较好实现生产柔性与生产效率融合的先进生产方式,在变种变量需求环境下它已被大量生产企业特别是装配式生产企业所采用。生产单元构建问题是单元化生产系统设计的关键问题和首要问题,也是单元化生产研究领域的一个热点。本文研究设备易复制情形下,通过配置多台同质设备来实现生产单元间无物料移动,并保证生产单元间工作量均衡的独立生产单元构建问题。本文在综合考虑换装时间、加工顺序、设备生产能力、产品需求量等多个实际生产要素的基础上,建立了以平均总流程时间和各生产单元总流程时间与平均总流程时间偏差最小为目标的数学模型,并开发了一个启发式算法来求解数学模型,最后通过数值算例验证了模型和算法的有效性。     

银行储户定期解存损失问题的研究

对于一个给定的定期存款,在其存期内的某一时刻,其价值是多少,若解存,其损失是多少?文章从资金增值的本源和资金的时间价值的角度出发,对上述问题进行了量化的研究.     

脑源性神经营养因于对体外培养的海马神经细胞的作用研究

采用新生小鼠海马神经细胞进行体外培养，观察了脑源性神经营养因子（BDNF）对海马神经细胞生长的影响．实验结果表明，BDNF实验组的海马神经细胞存活数、细胞突起数目、长度及胞体面积均明显高于对照组（P＜0．05）；BDNF这一作用的最佳浓度为100ng／ml．结果提示，BDNF对体外培养的新生小鼠海马神经细胞的生长有一定的促进作用．     

Effects of female body size and timing of nest foundation on the reproduction of the Japanese paper wasp,Polistes jadwigae Dalla Torre (Hymenoptera: Vespidae)

Summary Females in hibernation site (FH) were significantly larger than foundresses (FO), suggesting that larger FH were less successful in founding their nest. Body size of FO did not correlate with two nest characters, i.e., the number of cells at pupal stage (CP) and the timing of nest foundation (DP). However, CP negatively correlated with DP in 2 of 3 studied years, suggesting that foundress who founded her nest earlier than others tended to construct larger number of cells irrespective of her body size.     

Military procurement as rational myth: Notes on the social construction of weapons proliferation

This paper outlines four theoretical approaches to the sociology of weapons proliferation: strategic-functional theories, factional theories, geopolitical theories, and institutional theories. Although rarely formulated explicitly, the first three approaches are implicit in the existing literature on proliferation. All three see proliferation as the result of rational decision making, although they differ as to the locus of these decisions, with strategic-functional theories focusing on the nation-state, factional theories on subnational interests, and geopolitical theories on global superpowers. In contrast, the institutional approach disputes the rationality of procurement, arguing instead that weapons purchases are structured and driven by institutionalized normative structures that link advanced weaponry with modernization and sovereignty. The policy implications of this perspective are discussed, and parallels to recent developments in organizational theory are highlighted.     

金属晶体结构的体积解

本文根据晶体结构的周期性,求解出金属晶体结构的正格子原胞、倒格子原胞、维格纳—赛茨原胞和布里渊区以及金属晶体的两种典型晶格:体心立方晶格、面心立方晶格的体积,并探求出它们的几何关系。