Through rainfall simulating under laboratory , and making slice of sampling , the project researched in the soil crust development , and studied the dynamic rule of erosion factors which were raining and soil erosion factors during soil crust development . in the same time , the research was to find the critical condition of all factors in the process of soil crusting , and to filter the critical factor that could affect soil surface crust 本文采用人工模拟降雨方法，通过采样制作土壤切片，观察分析表土结皮在不同条件下发育的微形态特征，研究降雨、土壤等侵蚀产沙因子在表土结皮发育过程中的动态响应规律，界定表土结皮发育过程中各因子的临界条件，筛选有关土壤颗粒组成、结构特征等物理化学性质对表土结皮形成影响的关键因子。
This is the direct reason of bad reservoir property of sandstone , especially lower permeability . the influence and control factors of reservoirs include : deposition , diagenesis and tectogenesis . the deposition is the basic factor , it control the shape and distribution of sand body , and influence the type and the intensity of the diagenesis ; the diagenesis is the key factor , it control the process of pore evolvement , so the diagenesis control the sandstone ' s storage space and reservoir quality directly ; the fracture of the tectogenesis formation could improve the porosity and permeability of sandstone 其中沉积作用是基础，控制了储集砂体的形态特征和分布范围，同时由于不同沉积类型砂体在碎屑成分组成、泥质含量、颗粒粒度、砂体厚度、砂体内部的非均质性、孔隙介质的物理化学性质等方面不尽相同，从而也影响着砂岩所经历的成岩作用路径、类型和强度，因此沉积作用是控制储层发育的主导因素；成岩作用是关键，直接决定了砂岩的孔隙演化过程，从而决定了储层内部储集空间特征和储集性能；而构造作用形成的裂缝对改善砂岩的储渗性能具有一定作用。
The material with polymers property in the process of plastic injection show the totally differences in physical and chemical , rheological and thermal property , which bring forward some special requirement of plastic moulding technology , and then the special type of the plastic injection machine and the special machine are developed , the research object in the thesis is the plastic injection machine of thermohardening and the bmc bakelite moulding machine 高聚物特性的物料，在注塑过程表现出来的物理化学性质、流变性质、热性能有很大区别，对注塑成型工艺提出一些特殊要求，于是就有了一些特种注塑机和专用机的发展，本文的研究对象是热固性塑料注塑机及bmc电木成型机。
Cubic boron nitride ( cbn ) thin films have significant and potential technological application prospect in cutting tools , electronic and optical devices , etc . , because cbn possesses excellent physical and chemical properties , such as ultrahigh hardness only inferior to diamond , inertness against oxidation at high temperature , uneasy reaction with iron group metal , as well as the possibility of using as n - and p - type doped semiconductors 立方氮化硼( cbn )具有优异的物理化学性质,如仅次于金刚石的硬度、高温下强的抗氧化能力、不易与铁族金属反应、可n型掺杂也可p型掺杂成为半导体等,立方氮化硼( cbn )薄膜在切削刀具、电子和光学器件等方面有着潜在的重要应用前景。
Cubic boron nitride ( cbn ) is a synthesized wide - band - gap iii - v compound semiconductor and has lots of excellent physical and chemical properties . it has been attracted a nice bit of attention for years because of its application in mechanics , calorifics , optics and electronics 立方氮化硼( cbn )是一种人工合成的宽带隙-族化合物半导体材料，它有许多优异的物理化学性质，在力学、热学、光学、电子学等方面有着非常诱人的应用前景，多年来一直吸引着国内外众多研究者的兴趣。
The effects of the monolayer - formation conditions on the monolayer behavior , including the phase structure ( molecular packing ) , intermolecular interactions , stability , and so on , were discussed . based on the theory model we study low molecule weight surfactant ( behenic acid ) and phospholipid monolayer and the cyclic isotherms of their mono layers ; including the standard thermodynamic characteristics and aggregation of the cyclic isotherms 从力学性质着手，我们讨论了成膜条件对相态结构(分子排列) 、分子间作用力、稳定性等物理化学性质的影响；在此基础上，利用现有的理论模型讨论小分子化合物(二十二酸)及其磷脂分子压缩、扩张过程分子聚集、扩散机理及其热力学问题。
The second stage is stage of the matter transfers the activated matter , that is to say , minerals build up their surface area after passing though physical weathering , maifan stone form a lot of clay mineral , oxide , oxhydroxide and collide mineral after passing though chemical weathering . it makes nutrition elements transform from crystal state to adsorption state and it expands the activation of mineral , in the latter stage , it makes maifan stone have many special physicochemical adjusting character , for example , ph and foi bi - directional absorptive and ion exchange character , so these characters expand maifan stone ' s uses 第二阶段为物质转变的活性阶段，即通过物理风化增大表面积、通过化学风化形成大量粘土矿物、氧化物和氢氧化物及胶体矿物，使营养元素由结晶态转变为吸附态，从而大大增加了其活性。在后一过程中麦饭石还形成了许多特殊的物理化学性质，如ph值和f _ ( o2 )的双向调节性，吸附性和离子交换性等，从而扩大了其用途。
