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Random circle and sphere aggregate models, convex polygon and convex polyhedral aggregate models are separately adopted in the paper to simulate the flexural fracture process of concrete specimens in view of meso-mechanics.

本文分别采用随机圆形骨料、球骨料与多边形、多面体骨料模型，通过对全级配大坝混凝土试件弯拉破坏过程的细观数值模拟，对比分析了不同骨料模型形态对计算结果的影响，探讨了用球形骨料或圆形骨料简化实际碎石骨料的有效性。

The main contents of the present paper include: 1、The mechanism of fouling accumulation and the effects of fouling and slagging on boiler performance are analyzed. The model of fouling increasing is developed on the basis of sediment rate and denudation rate. The fouling monitoring models for boiler furnace and convective sections based on heat balance, the ones for air heater based on converted pressure difference are given. The implement results show that these models can reveal the cleanliness of boiler heat transfer surface. 2、The disadvantages of the model for boiler furnace fouling and slagging monitoring based on heat balance are discussed, and the calculation of radiant heat flux is considered as the primary difficulty.

主要包括以下内容： 1、分析了锅炉受热面污染形成的机理，从灰污的沉积率和剥蚀率角度出发，推导了受热面灰污增长的基本模型，分析了灰污热阻随积灰时间和烟气流速变化的规律，并通过大量现场试验，得到了沉积常数与时间常数的取值范围； 2、针对炉膛、对流受热面和空气预热器等不同受热面的传热特性，分别建立了基于热平衡和折算压差的污染在线监测模型，经实践验证，其监测结果能够满足现场工程应用的精度要求； 3、分析了基于热平衡原理的辐射、半辐射污染监测模型的不足之处，指出了机理模型因对炉内辐射换热量计算不准确，导致对以辐射换热为主的炉膛和以半辐射半对流的屏式过热器监测效果不够理想。

It supports both threading models when clients may be using either single-threaded or free threading models.

它支持这两种模式，当客户通过单线程或Free线程模式访问时

The only models I can recall on the local market were small hand launch gliders and a few wire framed, silk covered rubber powered models.

我对於市售的飞机只有一个印象，那是一架小的手掷滑翔机，细细的龙骨结构包覆丝料，以橡皮筋为动力。

Other exterior enhancements include new Roof-Mounted Off-Road Lights built into the roof rack air dam as a standard feature for Off-Road models, along with new side-step and roof rail colors and a new 4x4 badge on Xterra 4-wheel drive models.

其他外观的改进包括新的车顶上安装的越野灯到车顶行李架，作为关闭的标准特征路模式，以及新的侧步和车顶的颜色和铁路新的4x4徽章上的Xterra 4轮驱动气坝建模型。

The whole stand model system was set up for Larch plantation, which was composed of 5 models mentioned as follow and models were compatible each other: 1 stand ultimate self-thinning line and definition of SDI; 1 prediction model for trend of stand density index; 3 predicting model of height-diameter curve; 4 stand basal area growth model; 5 Schumacher's stand yield model.

以落叶松人工林林分断面积生长模型为核心的全林分模型系统，由满足相容性原则的5个模型所组成：1林分最大密度线及SDI的定义；2林分密度动态预估模型；3树高曲线动态预估模型；4林分断面积生长模型；1Schumacher式林分收获模型。

The whole stand model system was set up for Larch plantation, which was composed of 5 models mentioned as follow and models were compatible each other: 1 stand ultimate self-thinning line and definition of SDI; 1 prediction model for trend of stand density index; 3 predicting model of height-diameter curve; 4 stand basal area growth model; 5 Schumachers stand yield model.

以落叶松人工林林分断面积生长模型为核心的全林分模型系统，由满足相容性原则的5个模型所组成：1林分最大密度线及SDI的定义；2林分密度动态预估模型；3树高曲线动态预估模型；4林分断面积生长模型；1Schumacher式林分收获模型。

Based on the research of the medical security systems in seventeen typical countries, this dissertation concludes that all systems are composed of the following five models, namely social medical aid, social medical insurance, national health services, market-oriented medical insurance and individual saving medical security. These five models could be further divided into three types, i. e. public benefit type (including social medical aid model and national health services model), insurance type (including social medical insurance model and market oriented medical insurance model) and self-security type (individual saving medical security).

在对17个案例国家和地区医疗保障制度体系分析研究的基础上，本文归纳出了构成各国医疗保障制度体系的最基本的制度单元——五种制度模式，即社会医疗救助制度模式、社会医疗保险制度模式、国家卫生服务保障制度模式、市场医疗保险制度模式、个人储蓄医疗保障制度模式，并将这五种制度模式进一步归并为福利型(社会医疗救助制度模式和国家卫生服务保障制度模式)、保险型(社会医疗保险制度模式和市场医疗保险制度模式)、自保型(个人储蓄医疗保障制度模式)三种体制类型。

The four models were analyzed and normalized. We studied the procedure and method of building forest fire model base. Model base was build by object-oriented method based on category of model. Forest fire spreading models algorithm were implemented. We designed model dictionary base, model file base, and model knowledge base. Model base administration and maintenance functions were developed and implemented model file management, parameter management and knowledge management. The problems of interface between of model base and database were solved by means of model data control files. Model base ensured the availability of supporting for forest fire model suitability selection technology and forest fire model self-adapting updating technology.(3) Based on BP artificial neural network, we designed a frame construction of forest fire model selection of suitability. Forest fire model selection knowledge was produced through BP artificial neural network.

2建立了林火模型库建设的林火蔓延模型评价标准，根据模型评价标准和试验区实际情况，在42个林火蔓延模型中选择了目前最具有影响力和最具有典型代表性的Rothermel模型、王正非模型、加拿大模型和澳大利亚模型进行了解析和归一化处理；对林火模型库的建库过程和方法进行了研究，在林火模型分类基础上，采用面向对象的模型库表示方法建立了林火模型库；实现了林火蔓延模型算法，设计了模型字典库、模型文件库和模型知识库；开发了模型库管理与维护功能，实现了模型的文件管理、参数管理和知识管理；通过模型数据管理文件解决了模型库与数据库之间接口问题；实现了林火模型库对林火模型适宜性选择和林火模型自适应修正技术的有效支持。

Three regional climate models (MM4,RegCM2 and P-σ incorporated coordinate model)have been used to simulate the regional climate over eastern China in July .It is found that these three models have different performances in simulating different climate elements such as 500 hPa geopotential high field ,temperature fields,sea level pressure and rainy belt location.The results are important for developing regional climate model system which is suitable for eastern China and improving the simulation and forecast results.

利用MM4中尺度数值模式、RegCM2模式和P-σ混合坐标五层区域气候模式，以GFDL多年平均的6月份气候场作初始场，对我国东部地区7月份的区域气候进行数值模拟，比较、检验了三个模式模拟中国东部区域气候的性能，发现对500 hPa高度场、温度场、海平面气压场、雨带位置等不同的模拟对象，三个模式各有优劣，其结果对于发展适合我国东部地区的区域气候模式系统、改进模拟和预测效果具有一定的参考意义。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。