查询词典 natural selection

In this paper,detailed steps and key points in designning of light-gauge steel framing will be introduced, including column spacing selection of portal frame, structure system layout, selection of load value, material selection, design of portal frame structure and its members, and design of brace, column brace and purline .

结合多年设计经验，总结了轻型钢结构厂房的设计要点、思路和步骤，介绍了门式刚架柱网尺寸选择及结构体系布置、荷载取值、结构和构件设计、材质选择、柱间支撑、檩条、墙梁、拉条等设计要点，提出一些在设计中应注意的问题和建议，供同行参考

The construction of geochemical observatory has finished proof, well selection, site selection, term selection and settlement of instruments, and put into operation.

现腾冲火山地化综合观测站经科学论证、选井、选址、选项，已完成基建及仪器安装等建设，基本测项已投入正常观测。

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。

Using the method integrating geoscientific research with bit selection research, analysis is made on the stratigraphic-lithologic characteristics of all geological intervals in the area, the effect on bit selection and how to increase drilling speed is made clear. Based on the above, the conceptual profiled design for bit selection and drilling methods of all geological intervals is proposed on the basis of the stratigraphic-lithologic characteristics.

应用地学研究与钻头选型研究相结合的方法，对该地区各地质层段的地层产状与岩性特征进行了分析，获取了钻头选型对提高钻井速度影响的认知，提出了基于地层产状与岩性特征的各地质层段钻头选型及其钻井方式的轮廓化概念设计。

This project uses natural elements such as wood, bamboo, rock, and sand as the main materials for creation. Technical materials and concepts rich in natural qualities are also used. Artworks are exhibited in the natural environment and public space around the Aigrette Down. They engage in a simple but unique dialogue with the natural landscape and elements of public space.

本案将以自然界的木、竹、石、沙子等材料为主要创作材料，或富涵自然质感的科技材质，或观念上的介入等，以鹭鸶草原周边自然环境与公共空间做为展览空间，让作品与单纯却又具有特色的大自然地景及公共空间元素做对话。

Lycopene is a kind of natural anticancerogenics and antioxidant; carotenol is kind of natural colorant and antioxidant; carthamin yellow is a kind of soluble natural pigment; capsorubin and capsacin are natural pigments and food additives.

番茄红素是一种天然抗癌、抗氧化剂；叶黄素是一种天然着色、抗氧化剂；红花黄色素是一种水溶性天然色素；辣椒红素和辣味素是天然色素和食品添加剂。

Vulcanization thing in sulphur natural gas, take off to exclude, Make organic sulfur content and the vulcanization hydrogen of the natural gas of raw material accord with relevant technical index requirement , satisfy production needs,Today of the chemical swift development of natural gas the desulphurization method of natural gas also emerge endlessly , In traditional a ethanol amine the foundation of wet desulphurization and the dry law desulphurization of zinc oxide on, have arisen the desulphurization of normal temperature of ferric oxide, the dry law desulphurization of activated carbon and member sift desulphurization, DDS biochemical wet desulphurization wait for new technology .

硫的存在造成合成氨工艺中催化剂中毒，因此需将含硫天然气中的硫化氢、有机硫等硫化物脱除，使产品天然气的硫化氢和有机硫含量符合有关技术指标要求，满足生产需要。在天然气化工迅猛发展的今天，天然气脱硫方法也层出不穷。在传统一已醇胺湿法脱硫，氧化锌干法脱硫的基础上，出现了常温氧化铁脱硫，活性炭干法脱硫，分子筛脱硫，DDS生化湿法脱硫等新技术。

Natural yellow ocher mineral packs are natural mineral packs made of 12 types of natural ingredients,including natural yellow ocher and elvan stone,phlogopite,kaolin,jade,sericite,andgermanium,have added ingredients beneficial for skin todrastically increase the effects of the yellow ocher,do not contain any preservatives or chemical ingredients ,and are scent-free.

天然黄色黄浦矿产包是天然矿物包了12种天然成分，其中包括天然黄色黄浦和elvan石，云母，高岭石，玉，绢云母， andgermanium ，更增添成分有利于皮肤todrastically增加的影响，黄河黄浦，不含有任何防腐剂或化学成分，并有香味-免费的。

In the last chap-ter,the natural integral equation and natural boundary element method forharmonic problem on exterior elliptic domain are introduced.Then,based onthis,the natural boundary reduction method for a kind of exterior problem ofanisotropic constant coefficients elliptic equation is discussed, the natural inte-gral equation and its solving method on circular boundary and elliptic bound-ary are obtained.These results can be directly applied in coupled methodand DDM for exterior boundary value problem.

最后，讨论了椭圆外区域调和问题的自然积分算子即D-N算子及自然边界元方法，并基于此研究了一类各向异性常系数椭圆型方程外问题的自然边界归化方法，首次得到其在圆周边界及椭圆边界上的自然积分方程及其求解方法，并将这些结果直接应用于外边值问题的耦合算法。

As basic natural resources with mutual characteristics of natural resources and characteristics different from other natural resources,water resources have complex natural attributes and common social attributes,such as scarcity,integrity,regionality,sociality,fluidness,foundation,time limit and dualism.

自然资源是指在一定的时间、地点、技术和经济条件下，能够产生经济价值，以提高人类当前和未来福利的自然环境因素和条件，通常包括矿物资源、土地资源、水资源、气候资源与生物资源等 J。

After oxidation, pH value of the surface of carbon black has a specific relation with the volatile content.

氧化后炭黑表面的pH值与挥发分之间有一定的关系。

Knowing that such a person is warped and sinful; he is self-condemned.

因为知道这等人已经背道，犯了罪，自己明知不是，还是去做。