隐身目标雷达截面的缩比测量及反演计算

隐身雷达目标的电磁散射缩比测量是研究飞行器隐身、反隐身技术发展过程中不可缺少的组成部分。根据相似性原理，首先提出能与全尺寸原型目标具有相同散射特性的缩比测量应该具备的条件；然后提出当实际的缩比测量偏离这些条件时对雷达散射截面的影响。依照本文提供的原理和方法，可从不满足理想缩比条件的模型测量值推算原型的雷达散射截面。     

Pregnancy care and birth outcomes for women with moderate to super-extreme obesity

PurposeTo describe the health service utilisation and birth outcomes of pregnant women with moderate to super-extreme obesity.BackgroundMaternal obesity is increasingly recognised as a key risk factor for adverse outcomes for both women and their babies. Little is known about the service utilisation and perinatal outcomes of women with obesity beyond a body mass index of 40.MethodWomen with a self-reported pre-pregnancy BMI of 40 or more, who had received care and birthed a baby at the study site between 1 January 2009 and 31 December 2010. Clinical audit was used to identify the health service utilisation and birth outcomes of these women.Results153 women had a BMI of 40 or more. Women saw 6 different health professionals during pregnancy (1–16). Most of their visits were with a medical practitioner, often with limited experience, and almost all women only saw a midwife once at their booking visit (n = 150, 98.0%). While the majority of women experienced a normal pregnancy, free from any complications, almost half the women in this study experienced a caesarean section (n = 74, 48.4%).ConclusionClinical audit has been useful in providing additional information which suggests current maternity care provision is not meeting the needs of this group of women. The model of antenatal care provision may be a mediating factor in the birth outcomes experienced by obese women. The development of effective, targeted antenatal care, designed to meet the needs of these women is recommended.     

宁西铁路(南阳段)沿线产业发展环境条件分析

全面分析了宁西铁路路线 (南阳段 )产业发展环境的三大资源系统 ,建立评价指标体系 ,运用权值综合评判 ,揭示出南阳段沿线产业发展环境的优、劣势及地区差异。     

复杂交通网络中救援点与事故点间的路段重要性评价模型研究

对应急救援网络中的各相关路段的重要性进行快速准确地评价,对于应急交通计划、指挥与控制等交通服务具有十分重要的价值.本文针对目前该问题相关研究存在的一些缺陷,提出了新的算法思想,并设计了算法模型.首先,设计了复杂交通网络连通子图的矩阵算法,寻找多救援点和多事故点间的最大连通子路网;其次,根据该最大连通子路网构建GERT(Graph Evaluation and Review Technique)网络模型,针对该模型中人们对路段的选择概率设计了基于人们的理性和经验的概率选择模型,从而能够较好地反映人们的交通心理和行为(尤其是应急交通心理和交通行为);最后,定义了路网中路段重要性和重要度的概念,建立了基于最大连通子路网中去除某一定路段后的标准车辆通行时间差异的路段重要度评价模型.在此基础上,本文以某区域实际交通网络为例,对本模型及其算法进行了验证,效果良好.     

Conceptual and ethical problems underpinning calls to abandon vaginal breech birth

The view that vaginal breech birth is unjustifiable due to neonatal safety concerns has resulted in continued calls for breech pregnancies to be managed via a policy of planned caesarean birth. Vaginal breech birth has of course always occurred, but women with term breech pregnancies who seek to have a vaginal birth often face coercive pressures to have a caesarean birth instead. In this paper I argue that even if there is population level evidence that vaginal birth is relatively riskier for the breech presenting fetus, implementing a policy of planned caesarean birth would essentially be an unjustified attempt at forced medical intervention upon women. Advocates of a policy of planned caesarean birth often conflate the acceptability of allocating participants to a treatment group (policy) within the context of a randomized controlled trial with the justifiability of doing that as part of individual health care. Calls for obstetricians to “abandon vaginal breech birth” mistakenly position vaginal breech birth itself as a form of medical intervention that can simply be removed as an option for women by obstetricians. In reality, abandoning vaginal breech birth would entail abandoning women by denying them access to healthcare options that are otherwise available to any woman having a vaginal birth.     

黄金分割法在质量成本管理中的应用

黄金分割优选法是一种求最优化问题的方法。运用黄金分割法的基本原理,可确定质量成本管理中的符合性成本与故障成本的优化投入比例。这为企业选择最优的质量成本模型提供依据,以期以最小的成本获得最大的经济效益。     

0.618的文化内涵探讨

0.618神圣的黄金分割是世界上最美的数字,对0.618的研究可以追溯到古希腊时代。本文阐述了0.618黄金分割的内涵,并介绍了0.618黄金分割在我们生活中的几个应用,使人们对生活、大自然、社会又有了另一层的理解。     

隋唐大运河永济渠新乡段的历史变迁

大运河新乡段是申遗立即列入项目卫河(永济渠)主线的重要组成部分,是中国大运河形成时间较早、延续使用时间较长的河段之一,也是目前河南境内唯一一段可以看到的大运河河道。大运河新乡段历史悠久,始于隋永济渠,明以后改称卫河,历代均为华北平原上沟通南北的重要水道,承担着漕运、灌溉、行洪等功能,对新乡城市发展起到了重要作用。研究挖掘其深厚的历史及文化底蕴,对中国大运河申报世界文化遗产有重要的推进意义。     

A Longitudinal Study of Website Accessibility: Have Social Work Education Websites Become More Accessible?

This study (N = 45 schools) sought to determine the accessibility of baccalaureate social work program websites in 2003 and 2008 using Priority 1 checkpoints from the World Wide Web Consortium 1.0 guidelines. Paired t-test results indicate that the mean accessibility scores of five of the nine items (plus the website accessibility scale as a whole) was statistically higher after five years. However, 75.6% of programs still had one or more Priority 1 accessibility barriers in 2008 and thus did not meet the lowest W3C accessibility guidelines. This highlights the need for more education about barriers to accessibility and methods for making websites more accessible.     

《说文解字》“衣”部字笺证及文化抉微

《说文解字》是中国语言文字学的奠基之作,又是一部文化巨著。汉字是文化的载体。《说文解字》“衣”部字所承载的文化信息是极为丰富的,如祭祀大礼、丧葬礼仪、缝制修理、衣服材质、功用种类、纹饰色泽等。分类辨析,择要笺证,钩沉发隐,因声求义以探寻其文化意蕴。