试论汉语新词新语的规范化

新词新语的规范化应随社会的发展而有所不同。在一个日趋活跃的社会里,应该摒弃匡谬正俗式的规范观,而代之以动态的规范观,也即考察新词语在交际过程中的使用情况,在新词新语的动态的交际中,对其进行描写与解释。新词新语的规范的程度只是对新词新语使用情况的总结和鉴定,而不是人们使用的标准。     

电力系统可靠性经济边际分析

对广东电网500kV西江变电站内的2台主变压器的可靠性进行了边际分析．并用C＋＋Builder进行模拟仿真,结果证明了它的有效性。     

基于前后向扩散的图像去噪方法的研究

文章介绍了各向异性前向扩散、后向扩散以及前后向扩散的基本原理,针对前后向扩散中的恒定参数使图像细节模糊的缺点,对前后向扩散中的系数自适应改变的前后向扩散算法,并通过实验证明了自适应前后向扩散在消去噪声的同时更好地保留图像的细节信息,且具有更高的信噪比。     

一类半线性第三类椭圆边值问题非负解的存在性与唯一性

人口扩散模型在社会、经济等多方面有着广泛的应用,对其进行深入的研究有着一定的理论和实际意义.对一类人口扩散方程在其稳定状态下解的性态进行了讨论,其模型在稳定状态是一类半线性椭圆微分方程;对半线性椭圆微分方程的第三边值问题解的存在性和唯一性进行了研究.采用了上、下解方法,构造边值问题的上下解,证明了其非负解的存在性;并就...     

自然对流下废料熔化行为和碳扩散的模拟

A 3D model applying temperature- and carbon concentration- dependent material properties was developed to describe the scrap melting behavior and carbon diffusion under natural convection. Simulated results agreed reasonably well with experimental ones. Scrap melting was subdivided into four stages: formation of a solidified layer, rapid melting of the solidified layer, carburization, and carburization + normal melting. The carburization stage could not be ignored at low temperature because the carburization time for the sample investigated was 214 s at 1573 K compared to 12 s at 1723 K. The thickness of the boundary layer with significant concentration difference at 1573 K increased from 130 μm at 5 s to 140 μm at 60 s. The maximum velocity caused by natural convection decreased from 0.029 m·s?1 at 5 s to 0.009 m·s?1 at 634 s because the differences in temperature and density between the molten metal and scrap decreased with time.     

基于气体扩散模型的页岩气体散失规律研究

针对不同页岩损失气量计算方法计算结果差异大的问题,分析了传统单孔扩散模型的特点及不足,建立了耦合更贴近实际的时变气体扩散系数和时变岩芯边界气体浓度的修正单孔扩散模型。研究表明,原始气体浓度、气体扩散系数、岩芯边界气体浓度和岩芯尺寸是影响页岩气体散失的关键参数。当气体扩散系数较大或损失时间过长时,USBM直线法对页岩损失气量的计算不够准确。与分段线性递减相比,岩芯边界气体浓度指数递减模式可能更贴近实际情况。岩芯边界气体浓度递减速率主要控制岩芯内气体扩散完成的总时长,而气体扩散系数变化速率主要影响气体扩散前期的特征。建立的修正单孔扩散模型可较好地从气体扩散角度揭示页岩的气体散失特征,但该模型仍需耦合气体在压差下的流动过程并基于实测数据优化其关键参数,进而提高页岩损失气量的计算精度。     

求解对流扩散方程的4阶紧致差分格式

该文提出了在周期和Dirichlet边界条件下的1维对流扩散方程的紧致差分格式.在这2种边界条件下对空间变量使用4阶紧致差分格式,对时间变量利用3次Hermite插值公式构造空间和时间同时具有4阶精度的数值格式,并证明了格式的绝对稳定性,最后通过对2种边界条件下的算例进行数值实验和比较,验证了格式的精确性和可靠性.     

三维水污染模型的稳态解

水污染问题是当今人类社会的重大问题,在水流湍急的情况下,不考虑纵向扩散影响下建立了三维的反应扩散方程组,并讨论了其稳态解,这对水污染问题的长时间的动力行为有着重要的意义.     

免费商品对独立产品扩散的影响分析

以低值易耗品为研究对象, 基于传统的Bass扩散模型, 在价格营销策略下建立了多时期免费商品赠送水平的优化模型群, 将重复购买、批量购买等众多因素引入模型中, 应用灵敏度分析探讨了参数变化时最优解的稳定性, 结果表明: 免费商品的赠送会加快独立产品的扩散过程; 在价格策略选择时, 采用渗透策略的结果最好; 免费商品在首期赠送的效果要优于其他时期赠送, 形成了"首期赠样效应"; 当消费者需要批量购买时, 就需要更多的免费商品的赠送使得消费者对本商品的了解程度增加, 但在批量购买较高时赠送水平会维持在一个稳定水平下. 在此基础之上, 为企业的实际应用给出了基本操作步骤.     

Big Data: Unleashing information

At present,it is projected that about 4 zettabytes(or 10**21 bytes)of digital data are being generated per year by everything from underground physics experiments to retail transactions to security cameras to global positioning systems.In the U.S.,major research programs are being funded to deal with big data in all five sectors(i.e.,services,manufacturing,construction,agriculture and mining)of the economy.Big Data is a term applied to data sets whose size is beyond the ability of available tools to undertake their acquisition,access,analytics and/or application in a reasonable amount of time.Whereas Tien(2003)forewarned about the data rich,information poor(DRIP)problems that have been pervasive since the advent of large-scale data collections or warehouses,the DRIP conundrum has been somewhat mitigated by the Big Data approach which has unleashed information in a manner that can support informed-yet,not necessarily defensible or valid-decisions or choices.Thus,by somewhat overcoming data quality issues with data quantity,data access restrictions with on-demand cloud computing,causative analysis with correlative data analytics,and model-driven with evidence-driven applications,appropriate actions can be undertaken with the obtained information.New acquisition,access,analytics and application technologies are being developed to further Big Data as it is being employed to help resolve the 14 grand challenges(identified by the National Academy of Engineering in 2008),underpin the 10 breakthrough technologies(compiled by the Massachusetts Institute of Technology in 2013)and support the Third Industrial Revolution of mass customization.