面向对象技术与CAD/CAM系统设计

面向对象的编程技术与传统的编程方法完全不同 ,它把现实世界的问题抽象为“类”的概念 ,而解决问题的过程就是完成对类所生成对象的一系列操作。比起传统方法 ,面向对象编程使得用计算机系统解决问题更趋于自然化 ,因为实际应用中的概念直接以“类”的形式存在于计算机中 ,这样易于被理解     

振冲置换法处理衡运大厦液化地基

结合工程实例,按照《建筑抗震设计规范》(GB50011—2001),较为详细地分析了饱和地基在地震时产生液化的原因、地基土地震液化的判别、液化指数的计算、液化等级的划分、地基液化的处理方法和振冲置换法的设计。用载荷试验方法对单桩允许承载力进行了检测和沉降观测,采用静力触探和标准贯入对碎石桩处理液化土层的效果进行了检验。结果表明,采用振冲置换处理饱和地基,改善原地基土的力学性质,液化地基处理效果良好,提高了地基土的整体承载力,减少了沉降量。     

我国新农村建设类型划分与模式研究

新农村建设是我国经济发展到一定阶段的必然过程,我国已进入工业化中期阶段,一定程度上具备了新农村建设的经济基础。由于我国经济发展的区域差异显著,处于不同发展水平的地区,其新农村建设内容、重点、模式和方式上都应不同。基于此,本文从城乡统筹的角度,以省为单位分别设立了评价我国城市和农村发展水平的两套指标体系,将我国的城市与农村发展水平分别划分为强、中、弱三个级别,并对各省评价结果进行了叠加。按照经济发展水平相对一致的原则,将叠加的结果归并为五个类型,分别是发达类型、相对发达类型、发展中类型、相对落后类型、落后类型;最后针对各类型的经济发展水平不同,初步探讨了个类型的新农村建设模式,提出了各类型新农村建设的重点。     

Ausbau des Stichkanals nach Salzgitter von SKS‐km 3,550 bis 14,918

Expansion of the branch channel to Salzgitter from SKS‐km 3,550 to 14,918 The branch channel to Salzgitter will be extended to the waterway category Vb in the next years. This will enable inland waterway vessels with a width of 11,45 m and a loaded draft of 2,80 m to run it without limitations. The reaches Wedtlenstedt and Üfingen will be extended in most areas to a trapezoidal cross section with a width at water level of 36,90 m and a water depth of 4,00 m. The exit basins of the locks will be extended on one side. Overall about 1 000 000 m² of soil will be moved. About 300 000 m² of clay sealing and 460 000 m² of rip‐rap will be installed. Three culverts have to be replaced by new constructions to adapt to the new cross section of the channel. In addition two bridges will be modified to allow for a clearance of 5,25 m. At present the plan approval procedure is carried out. It is expected to achieve the plan approval order in 2017. The construction is planned to start in 2018. Completion is scheduled for 2024.     

ISO/IEC、美日中氢能技术标准化体系比较与建议

技术标准在技术进步、国际贸易中具有重要作用。全景式梳理、比较氢能技术标准化体系发展与现状,对于促进技术进步、规范国际贸易至关重要。本文综述了ISO/IEC、美国、日本和中国等5个主体氢能技术标准化体系：介绍了上述5个主体的氢能标准化机构,详细梳理了ISO/IEC氢能国际标准与美日中氢能国家标准/行业标准的层级结构比例,并按标准具体内容将其归类到8个技术类别中,分析了各主体在8个技术类别中的分布与特征。文中指出相比于美国和日本,中国氢能技术标准化体系存在行业标准数量较少、氢能产业联盟在行业标准制定中主导性弱和部分技术类别覆盖度低的不足。针对上述不足,文章对中国氢能技术标准体系提出两条发展建议：增加行业标准数量,以发挥其对标准体系补充、完善的作用,为此需赋予中国氢能产业联盟制定行业标准的权限;优化中国氢能技术标准分布,提高氢储运与加注以及氢能应用等技术类别的覆盖度,保障氢能产业从定点示范运营到城市群大规模推广的顺利升级。     

Influence of Methanol on Prion Reduction during High Temperature and High Pressure Oleochemical Processes

Prion‐reduction in standard biodiesel processes is caused by acidic and alkaline conditions. In the alternative RepCat biodiesel process, efficient prion‐reduction can be achieved by high‐temperature/pressure. However, a possible increase in thermostability of prions in the presence of methanol during these conditions has not previously been investigated, and is verified in this work. Samples are spiked with prions, treated with methanol, and incubated at 220 °C at 80 bar for 30 min. No traces of protease‐resistant prion protein (as proxy for prions) are detected in tallow or glycerine (as the final by‐product) after treatment. Serial dilutions of spiked prions show at least 6 log₁₀ prion reduction. More importantly, similar effects are detected using milder conditions of 200 °C at 70 bar for 15 min, representing the worst‐case conditions of the process. In conclusion, this study shows that methanol does not increase the thermostability of prions and the RepCat process can efficiently eliminate prions and is therefore safe for the usage of category 1 tallow. Practical Applications: The study further supports the applicability of RepCat process in reducing prion‐contamination in the presence of methanol. Furthermore, the conditions leads to a considerable reduction of prions in glycerine obtained as by‐product.     

Dynamic model of online information quality perceptions and impacts: a literature review

This paper reviews the literature related to the concept of information quality (IQ) in the context of the online environment to understand how it has been conceptualised in the Information Systems (IS) literature, to identify gaps in the literature, and to make recommendations for future research. This study also extends the Information Processing Model (IPM) and proposes a novel dynamic model of online IQ perceptions and impacts. To understand the online IQ construct, an in-depth review of the literature is conducted. Overall, we reviewed 508 journal articles published between 1995 and 2016. This study found that there is a substantial gap in the IS literature in regards to a full understanding of the online IQ construct and its relation with the IPM. More research is needed to understand the way individuals process and respond to online information. Further, although the importance of context in theory development has been emphasised in the literature, very few empirical articles have explored the impact of contextual factors on the IPM as well as perceived online IQ. The findings provide online vendors with important guidelines that should be considered to motivate individuals to acquire more information from their websites that could lead to more satisfied and loyal users.     

基于原型范畴理论的大学英语词汇教学研究

范畴化是一种抽象的认知活动,是概念和语义形成的出发点。它基于身体体验,随着认识的发展和特殊的需要不断形成新范畴,扩展老范畴。因此,对于范畴的界定应该是动态的。在英语词汇学习中,可以通过形成词汇链、建立多义词语义网络和积累下义层次词这些静态手段,培养学生的范畴化能力。学生还可以根据自己的学习任务,通过各种手段自主地进行范畴化,使符合任务要求的词汇进入到一个临时建构的范畴中。通过词汇的范畴化和重新范畴化过程,充分发挥学生的能动性,提高学生的学习效率和英语综合能力。     

直读光谱仪在能力验证中的应用

低合金钢中五大元素的测定是实验室的常规检测项目,通常采用经典的化学分析方法,本文通过对直读光谱仪参加实验室低合金钢中常规检测项目的测试能力验证,结果令人满意。     

ATSE核心参数选择几点思考

提出电气设计中选择ATSE时,应按正常使用时的负荷情况考虑使用类别;根据负荷特性和ATSE在整个供配电系统中的位置选择转换类型及转换时间;在短路时按照PC、CC、CB级分别考虑其短路特性.