The following results are achieved : ( 1 ) in accordance with the empirical electron theory of solids and molecules , considering the number of covalent bond pairs on the strongest bond in a segregation structure na , the elements for matrix - strengthening can be chosen . ( 2 ) on the basis of the available phase - equilibrium thermodynamics calculation of alloy system and phase diagrams , which have been worked out , the contents of alloy elements can be identified with reference to the types , quantity and phase - transformation of carbides . ( 3 ) both the values relating to toughness ( including bending strength , yield strength , impact value of unnotched samples ) and hardness of new dm9 die steel are higher than those of crl2mov die steel 结果得出： ( 1 )根据固体与分子经验电子理论，利用偏聚结构单元的最强共价键上的共用电子对数n _ a ，可以选择工模具钢基体相的强化元素； ( 2 )根据合金系相平衡热力学计算及已有的相图，可以碳化物类型、数量及其相变确定合金元素含量； ( 3 )新型dm9钢在强韧性(抗弯强度、屈服强度、无缺口冲击值)和硬度方面均高于cr12mov钢； ( 4 )以dm9钢与6crw2si 、 7cr2wmovsi ( dm7 ) 、 h13和cr12mov四种模具钢的实验比较，进一步验证了上述冷作模具钢合金设计方案是合适的。
And then , based on the features of reinforced concrete structures during construction , the features of construction resistance of the structural element are studied , and the probability model of the resistance is suggested . the factors which influence construction resistance of the structural element during construction are analyzed 此外,基于钢筋混凝土结构在施工期间的特点,研究了结构单元的抗力特性,并且提出了可能的抗力模式,同时分析了影响结构单元抗力的一些因素。
On the basis of the interrelated theories about the science of earth information , karst environment , as well as social and economic statistics , and with the support of the technology of remote sensing and geographical information system , the paper takes guizhou area as the example to make a analysis on the spatial patterns , the process and the evolution mechanism , and the driving factors of the rock desertification . meanwhile , to study of karst rock desertification , this paper makes a contrastive analysis of such special subjects as the ways of drawing information of rock desertification in the typical areas with plateau - gorge structure , the patterns and changes on the landscape ecology of rock desertification and the remote sensing monitoring on the ecological returns of controlling project 根据地球信息科学、喀斯特环境学、社会经济统计学等相关学科理论，在遥感和地理信息系统技术的支撑下，分析和探讨了贵州喀斯特石漠化的空间分布格局、发育演化机制和驱动因子，并进行了高原?峡谷二元地域结构单元中典型样区的石漠化信息提取方法、石漠化景观生态格局及其变化和治理工程的生态效益遥感监测等专题内容对比分析，多尺度地开展喀斯特石漠化问题的研究。
Then the structure unit of hexangular lattice is found according to the principle of invariable symmetry . renormalization transformation is processed when we regard the structure unit and the growth model as graphs before and after transformation respectively . after choosing the 11 thermodynamic function fugacity as parameter , we can write out the partition functions before and after transformation and the formula of renormalization transformation 然后根据对称性不变的原则，从整体晶格中选取结构单元，把结构单元和生长模型分别作为重整化变换前、后的图形来进行重整化变换，选取热力学函数易逸度为参量，写出了重整化变换前后的配分函数和重整化变换关系式，求出了这一变换的不动点。
Based on process plan reuse layering , unit - based similarity is applied to process plan design of structure unit , and the coding architecture of structure unit and grading matching strategy are presented . the modification algorithms for similar plan and method of process planning reasoning generating for new structure unit are provided 基于工艺可重用层次性思想，应用结构单元层次的相似性进行零件结构单元的工艺链设计，提出了结构单元编码规则以及进级匹配的搜索策略，对检索出的相似工艺修改和新结构单元工艺的生成给出了相应的算法。
