高效可靠的边界层网格分块层进生成算法

为了提高复杂3D外形的边界层网格生成速度,提出一种基于离散中轴面的前沿分块层进算法.以闭合的边界三角形网格作为输入,在内部生成只含边界点的约束Delaunay三角化背景网格,聚集所有四面体的外心构成离散的中轴面.根据边界面片离中轴面的距离,将边界面片分为2类:快速推进的开阔区域面片和逐层推进的狭窄区域面片.在Intel Xeon X5650 CPU的单核上对NASA通用研究模型的边界层网格剖分结果表明,该算法的剖分效率是传统层进法或膨胀法的10倍以上,且完成106量级边界面片的分块只用了若干秒.

专业搜索引擎的实现与研究——中文分词算法

为实现专业信息查询的中文搜索引擎,首要的问题就是中文分词。本文首先介绍了分词用词典数据结构的组织以及使用二分查找的查询算法,然后提出了一种基于最短路径的改进分词算法。实验证明,利用该算法,可以消除大量歧义,取得较好的分词效果。

怎样使用语序、重复和语态进行强调

一个意思常可以有几种表达方式。如果某一种表达方式比其它表达方式能更加强调想要强调的内容,那么这种表达方式就是最好强调方法。当然英语中可用作强调的手段很多。本文主要介绍几种学生不太了解的强调方法。它们是: 一、强调性词序(Emphatic Word Order) 1.利用句首和句末的位置(The beginning and the end of a sentence) 英语句子的开头和结尾都是强调的位置。最重要的内容常放在这两个位置上。

强调在修辞手法中的运用

在英语修辞手法中有众多的表强调的修辞格,如:重复、夸张、曲言、对照、层进等,他们通过不同的表现形式,突出了作者和说话者所要强调的重点,从而进行了有效的交流.

层进式教学模式在体育教学内容改革中的探索研究——以青岛职业技术学院为例

2013年1月，青岛职业技术学院设立了独立建制的体育教学部，部门成立后设有专门的管理人员，明确教务处为体育课程教学管理机构。新回归的体育工作者们群策群力，创造性地提出了体育教学内容层进式教学模式，同时充分尊重个性存在，结合高职生所学专业特点，科学选择课程内容，开设了不同层次、多种类型、内容丰富的体育课程内容，逐步形成以理论与实践、康复与保健、课内与课外、兴趣与自主选择相结合的教学内容体系。

MARS:A General Multilayer Area Router

Based on a ripped-up and rerouted methodology,a multilayer area detailed router is presented by using simulated evolution technique.A modified maze algorithm is also performed for the single net.

浅谈英语修辞

英语修辞同汉语一样,也是运用各种手段对语言进行调整与修饰加工,以增强语言表达效果。英语常用的修辞手段如下: 一、明喻(Simile) 用另一种事物比方所要说明的事物,通常格式是A像B,使用as,like,as though一类的词。 例:The party is my mother. My heart is like a singing bird. Her face is as freSh as a rose.

谈谈提问

提问是启发式教学的重要手段之一。研究提问，能培养学生的主动性和独立思维的优秀品质。提问具有整体性、灵活性、普遍性；提问的过程是一种螺旋式的上升；提问要求有梯度、有适度；提问的方法，有归纳法、层进法、辨析法等。

Matter-elements model and application for prediction of ccoal and gas outburst

The theory and method of extenics were applied to establish classical field matterelements and segment field matter elements for coal and gas outburst.A matter-element model for prediction was established based on five matter-elements,which includedgas pressure,types of coal damage,coal rigidity,initial speed of methane diffusionand in-situ stress.Each index weight was given fairly and quickly through the improvedanalytic hierarchy process,which need not carry on consistency checks,so accuracy ofassessment can be improved.

Risk assessments of debris flow based on improved analytic hierarchy process and efficacy coefficient method

In order to evaluate the danger of debris flow properly, eight factors were selected as the risk assess- ment indexes of the debris flow, namely the vertical slope, valley relative difference, hillside slope, area of ba- sin, loose solid material reserves, the path length of sediment supply probability, silting and scouring derrieking and vegetation coverage. The improved Analytic Hierarchy Process （ AHP ） method was used to obtain the weights of the factors; and the efficacy coefficient method was adopted to evaluate the risks of six typical debris flow gullies. According to the research, the improved AHP method not only avoids the subjectivity in the indi- vidual factor valuation by comparing two factors of each layer, but also makes the subsequent consistency check unnecessary.

Measuring potential food productivity for different areas in Songnen Plain based on analytic hierarchy process

The improved analytic hierachy process method was utilized in this paper,and a variety of factors influencing the food production were classified into several interrelated orderly objectives layers;based on the works above,this paper made an scientific assessment on the influencing factors of food production and production potential of the various regions in the Songnen Plain.The weights and composite indices were calculated with the method of solving weight by AHP's accumulation factor sequence evaluating data,and were processed by single-level sorting and general sorting.The result showed that,the region of Changchun had the biggest potential for improving food production,but smallest for Heihe region.The key reason for the food production discrepancy of a variety of regions in Songnen Plain is the differences in scale of production and climatic conditions,the weight coefficients of which are 0.3654 and 0.2742;however,the weight coefficients of agricultural science and technology investment is very low just 0.1703,which should be increasted in the future.

Technological optimization of fully mechanized caving mining face with large mining heights

Fully mechanized cave mining with large mining height is a new mining method, due to its large mining thickness and lower roadway excavation, the technology has been widely used in China＇s thick seam mining. In order to improve the top-coal recovery ratio of fully mechanized cave mining with large mining height, a study was conducted on optimizing the caving process, based on the mechanized caving face 1302N in Longgu Coal Mine. This was achieved by improving the PFC numerical calculation methods, and establishing a more accurate model system. On this basis, the recovery ratio of the top coal in different drawing intervals and technologies was investigated in order to achieve a reasonable caving process. The top-coal tracking system was used for practical surveying of the recovery ratio of top coal.

Aquifer parameter identification by the best chromosome clone plus younger generation chromosome prepotency genetic algorithm

This paper developed an improved combinatorial method called the best chromosome clone plus younger generation chromosome prepotency genetic algorithm （BCC-YGCP-GA） to evaluate aquifer parameters. This method is based on a decimal simple genetic algorithm （SGA）. A synthetic example for unsteady-state flow in a two-dimensional, inhomogeneous, confined aquifer containing three hydraulically distinct zones, is used to develop data to test the model. The simulation utilizes SGA and BCC-YGCP-GA coupled to the finite element method to identify the mean zonal hydraulic conductivities, and storage coefficients of the three-compartment model. For this geometrically simple model, used as a prototype of more complex systems, the SGA does not reach convergence within 100 generations. Conversely, the convergence rate of the BCC-YGCD-GA model is very fast. The objective function value calculated by BCC-YGCD-GA is reduced to 1/1 O00th of the starting value within 100 generations, and the hydraulic conductivity and storage of three zones are within a few percent of the “true” values of the ideal model, highlighting the power of the method for aquifer parameterization.

An approach to quality assessment for web service selection based on the analytic hierarchy process for cases of incomplete information

Since web services intended for the same application environment tend to be functionally homogeneous, researchers have turned to their non-functional aspects in order to constructively compare web services and choose an appropriate one. In general, quality of service is very important to users. Many schemes that consider quality assessment have been proposed for web service selection. With the increasing number of qualityrelated attributes, an effective quality assessment method needs satisfactory scalability. Schemes based on the analytic hierarchy process(AHP) meet this requirement. However, prevalent methods in this vein overlook the fact that the traditional AHP needs a complete judgment matrix. In practice, all the information needed to construct a judgment matrix is often unavailable for a variety of reasons, due to which certain judgments cannot be made. In this paper, for an incomplete judgment matrix, we propose an improved AHP approach to consistency verification and the subsequent ordering. Our method can deal with situations where information is insufficient,and inherits all the merits of the traditional AHP approach. A case study establishes the effectiveness of our proposed method.