航空惯导系统核心器件寿命测定方法

本文采用一种新方法对航空惯导系统核心器件进行加速寿命试验,试验中采用的加速电流超过了一般加速寿命试验所选取的加速电流,通过对试验数据的分析讨论了该方法的可行性,在加速寿命试验中,对加速电流的上限进行了确定。     

三维点激光测头模型建立及仿真研究

在了解激光测头的工作原理的基础上,通过光散射原理建立了被测表面倾斜角与接收透镜接收光功率的关系来表示激光三角法测头的特性仿真模型。通过计算机对其进行模拟获得了信号输入分别与位移与表面倾角的关系。     

基于激光切割技术的科技馆文创产品开发实践研究——以“记里鼓车拼装玩具”为例

科技馆开发文创产品,能够更好地实现自身的社会功能,对于延伸科技馆科普教育功能、满足公众对科普事业的需求具有重要意义。激光切割技术,作为一种加工制作方法,为文创产品研发设计提供了技术支持。本文基于激光切割技术的文创产品（拼插玩具）的开发实践,阐述激光切割技术在文创产品开发中的应用、科普文创产品设计理念与开发策略、自研科普文创产品研发思路与开发流程等,以期对科技馆行业内的文创产品开发工作有所启示。     

Marketing strategy in emerging markets: a conceptual framework

Citing difference between emerging and developed markets, scholars highlight need for different approaches to marketing in emerging markets. In this paper, we argue that while there are some unique characteristics of emerging markets, all countries within emerging markets do not have similar levels of product penetration and consumption. As a result, it is wrong to assume that emerging markets are untapped and under-served across the product categories. To a list of characteristics identified as unique to emerging markets, we add large population as an important characteristic and discuss its strategic implications. We develop a conceptual framework that factors in combined effect of varying degrees of product penetration & consumption levels with large population of emerging market countries. The conceptual framework identifies four strategic alternatives for marketing in emerging markets. Instead of recommending any generic marketing strategy, we propose that marketers need to choose an appropriate mix of strategies aimed at primary and selective demand creation in emerging markets.     

Date of birth and selective schooling: Some lessons from the 1944 education reforms in England and Wales

We compare the probabilities of selective (grammar) school entry in England and Wales before and after the 1944 Education Act. The Act had direct and indirect influences on the costs of grammar education and on entry-exam coverage, design and marking methodology. Post-1944, grammar school entry among children born in the middle of the school year improved considerably. We argue that age-adjusted group standardized testing was an important contributory factor. The youngest pupils remained significantly disadvantaged. We produce evidence that this is consistent with the practice of streaming (tracking) junior school children at age 7 into classes delineated by average ability.     

减量增效技术的选择性采纳与集成推广策略

目的 基于农户“选择性采纳”特征开展减量增效技术的系统集成与打包推广,是降低推广成本、提高推广效率的重要途径。方法 文章运用2017—2018年浙江省638户稻农调研数据,基于列联分析、Order Probit与Multivariate Probit模型,从采纳强度和采纳结构两个方面,分析了农户化肥减量增效技术选择性采纳特征及其影响因素。结果 农户选择性采纳现象十分普遍,且技术属性与资源禀赋共同塑造了选择性采纳特征：（1）采纳强度较低,减肥技术平均采纳强度为1.74项。（2）虽然总体上农户更加偏好资金密集型技术,但采纳结构差异明显,多项减肥技术采纳决策中同时存在替代与互补关系。（3）禀赋约束是决定农户选择性采纳的重要因素,其中劳动力数量、家庭收入等经济禀赋决定了劳动力密集型与资本密集型技术的取舍进而影响了采纳强度与采纳结构,而参与技术培训、加入合作社等社会禀赋则有助于缓解经济禀赋约束。结论 减量增效技术的集成推广应基于农户资源禀赋异质性,制定更为灵活化、差异化的推广方案。     

Selective versus Random Moose Harvesting: Does it Pay to be a Prudent Predator?

Seeking to act as prudent predators in many biological systems, humans try to harvest in a sustainable manner. In Sweden, wildlife managers and moose hunters use information about the future contribution of individual moose to population growth (i.e., their reproductive value), in order to harvest low-and non-reproductive animals. This selective harvest strategy results in a significantly faster overall population growth rate. To investigate whether this selective harvest policy is economically beneficial, we calculated the present value of the selective moose hunting policy used in Sweden compared to the present value of a non-regulated (i.e. random) moose harvest. Present values of the moose hunting produced by the different hunting regimes were calculated for a period of ten years and at interest rates ranging between 1% and 10%. The difference in present value between the selective hunting policy and the average outcome of random harvesting was SEK 310 million ($ 36 million) and SEK 300 million ($ 34 million), or SEK 1 321 ($ 154) and SEK 1 279 ($ 149) for an average moose hunter, when using interest rates of 3% and 4%, respectively. To determine whether the current selective moose hunting policy is economically profitable or not, benefit estimates like these should be weighted against the costs of upholding the policy. Most of the costs probably lie in providing the hunters with information about the future harvesting prospects and reducing the risk of divergences from the policy. The welfare effects of a hunting policy will also be dependent on the individual hunter's preferences, for instance in terms of their attitudes towards risk. This revised version was published online in August 2006 with corrections to the Cover Date.     

门框上部内板工艺数模的建立和应用

本文介绍了门框上部内板工艺数模的建立过程,并叙述了工艺数模在用激光切割机,切割边工序中的应用和效果。     

连续氟化氢化学激光器TRIP技术混合机理分析

利用氟化氢作为化学激光器的激发气体是第一代化学激光器的基本原理,其应用的范围较广。文章利用试验和研究结论,分析了利用TRIP技术对混合气体进行干扰而提高增益的基本理论。     

“选择”教学体验“成功”——谈职校计算机学科教学中的成功教育

针对职校计算机学科教学中“失败成瘾”的现状，学校可努力实践“选择”教学，使学生体验到“成功”。这突出表现为师生选择教与学，教师选择适合职校学生个性特长和自身特点的教学内容、教学方法、教学情境、评价方式．学生选择自己喜欢的教师、适合自己个性特长的技能、学习方法、符合自身基础的自我成功期望等，从而师生双方均取得预期成功。