旋转推铅球教与学的要素

旋转推铅是推铅球的方法之一.要学会这种方法,在教与学的过程中必须掌握:扭转推球、控制转动惯量给人体平衡造成的干扰、射体重心向圆心移动、旋转与投掷之间的衔接等技术要素.     

一种改进的信息检索方法

在数据库系统的基础上，利用模糊数学的方法和工具对传统信息检索进行扩充，从而得到一种改进的信息检索方法。主要包括：提出解决问题的方法、选择实用性强的数据库系统、确定接近于自然语言的隶属函数、构造含模糊化的SQL命令并加以实现。     

Option pricing in the presence of natural boundaries and a quadratic diffusion term

This paper uses a probabilistic change-of-numeraire technique to compute closed-form prices of European options to exchange one asset against another when the relative price of the underlying assets follows a diffusion process with natural boundaries and a quadratic diffusion coefficient. The paper shows in particular how to interpret the option price formula in terms of exercise probabilities which are calculated under the martingale measures associated with two specific numeraire portfolios. An application to the pricing of bond options and certain interest rate derivatives illustrates the main results.     

农业科技演进中的“跨越”问题

实施农业科技“跨越”发展方略 ,尽快缩小与发达国家农业科技贡献率的差距 ,是提升我国农业和农村经济素质与效益的必由之路。“跨越”发展为赶超提供了机会与可能 ,只有具备了“跨越”产生的必要和充分条件时 ,这种机会与可能才会成为现实。我国已经具备这些条件 ,问题的关键是如何正确把握跨越式发展的战略思路及运行方案设计 ,以及如何进一步合理确定农业科技发展的优先领域和一步到位直接进入当代最先进农业技术行列的开发推广项目和范围。     

JDF中油墨预置信息的解析

随着印刷数字化技术的发展,印前生成的油墨预置信息常存储在JDF文件中,并随JDF文件在数字化上作流程中传递。为使不具有CIP4油墨信息接口的印刷机能够使用JDF文件中的油墨预置信息,本文研究了JDF文件中油墨预置信息的存放形式,给出了相应的JDF文件解析方法。结果表明,本文所设计的方法町以正确地解析出JDF文件中的油墨预置信息,也可以生成含有油墨预置信息的JDF文件。     

数字化分析技术在提高阀门检验质量中的应用

针对传统阀门质量检验统计分析以人工统计为主、耗时长、效率低、时效性差、结果不准确等问题,通过开发智能质量检验统计分析系统,自动采集压力试验数据,自动生成检验记录、检验报告以及各类报表,还可以根据制造厂商、阀门类型、缺陷种类等自动生成柱状图、饼状图等质量分析图表,降低了人工录入数据的差错率,检索统计准确迅速,提高了检验效率和检验质量,为产品质量管理提供了快捷、高效的决策数据。     

Barriers to the investment in the Concentrated Solar Power sector in Morocco: A foresight approach using the Cross Impact Analysis for a large number of events

The Scenario Analysis methods have often been used by policy makers as an instrument to manage uncertainty and to support the shaping of long-term economy policies. In this research, we apply Scenario Analysis in order to identify the barriers affecting the decision to invest in the Concentrated Solar Power (CSP) sector in Morocco. Our results aim at facilitating the process of defining different paths in strategic political and policy actions. Using data from a survey on a panel of experts, the Cross Impact Analysis (CIA) and the Cross Impact Matrix System (SMIC) techniques are applied. The advantage of these techniques is that they allow including in the analysis the interlinkages between the events that will define the future scenarios. However, their limitation is that the number of events analyzed cannot be too high since the information collected from the experts increases exponentially according to the number of events introduced. We thus expand our analysis with a new methodological approach, combining the use of prospective and statistics techniques. This approach allows addressing the mentioned limitation and applying these techniques, initially restricted to 6 events in its common application, to a large number of events. The results show that uncertainty and informality would be key factors in promoting the arrival of companies in this sector. Additionally, regarding companies that already have a presence in Morocco’s renewable energy sector, an increase in activity would be achieved through improvements in the easing of financial and legal barriers.     

赤水水库塑性混凝土心墙施工技术分析

文章结合塑性混凝土心墙在赤水水库除险加固工程的应用,分析塑性混凝土心墙的施工技术要点。     

对框架结构高层建筑梁柱节点的施工技术探讨

在高层建筑施工中,框架结构的节点是联系整个结构体系的枢纽,节点承受由梁端和柱端传递来的各种荷载的共同作用且受力复杂。因此,节点要求具有足够的强度,以保证整个结构体系的安全可靠。本文针对框架节点处理技术的基础理论及在施工中的应用问题进行探讨,并提出应注意的几个问题。以期通过本文的阐述对促进高层建筑施工质量,提高施工进度提供理论支持。     

CZ法单晶等径生长模糊控制系统设计

针对单晶等径生长过程中主要是对系统的温度和晶体测径环节的控制,介绍了一种基于模糊控制与PID算法的CZ法单晶等径生长控制系统。详细阐述系统的组成,重点介绍系统采用双闭环串级控制。最后通过仿真测试,结果表明,该系统具有对现场温度、单晶直径等参数的合理控制和调节功能,能够有效地改善系统控制性能。