查询词典 porous

The amplitude of the surface velocity of the panel and the acoustic pressure on the porous surface are reduced largely in the vicinity of structural resonances due to the additional radiation damping and visco-thermal absorption phenomenon in the porous layer.

请注意振膜表面速度分布的两种极端情况。一种极端情况产生在作活塞运动的刚性表面中，此时整个表面的振幅和相位是处处相等的。

The total strain of a porous medium is an algebraic sum of primarystrains and structural strains.Primary strain is caused by the deformation insideparticles of porous media,while structural strain by the relative displacementsbetween particles.

本体应变是由构成多孔介质的骨架颗粒单元体本身的变形所导致的介质应变量，而结构应变则是由颗粒之间的相对位移所导致的介质应变量。

Early cylinders were completely filled with a porous filler material consisting of diatomaceous earth (a porous calcium material formed from the accumulation of small organisms on ocean and lake beds millions of years ago), charcoal, asbestos, and cement.

每个钢瓶都彻底填满了由硅藻土（一种几百万年前小生物在海底和湖床堆积而成的多孔渗水含钙材料）、木炭、石棉和水泥组成的多孔渗水材料。

A new view about the porous growth is put forward, which indicates the evolution of oxygen in barrier layer results in the original porous embryo.

提出了在阻挡层的生长过程中，氧气的析出是造成多孔产生的新观点，并从不同电解液角度进行了论证。

The finite element method is applied to analyze the attenuation performance, which is basing on that porous clapboard, porous pipes and absorbent are accurately modeled and the influence of temperature, velocity and tail reflection is taken into account.

采用有限元方法，在对穿孔隔板、穿孔管和吸声材料进行精确建模，并考虑温度、流速和尾管反射对消声的影响的基础上，对消声特性进行分析。

The lauan wood is used as a template to prepare Al/C and Al/ composites. Porous carbon is first pyrolyzed from the wood template. The final composites having wood structure are obtained by injecting aluminum alloy and silicone resin into the porous carbon. The microstructures, thermal expansions, and thermal conductivity of these products are analyzed by the scanning microscope, dilatometer, and conductometer. The model of thermal conduction is established.

该文以柳桉木材为模板，先将其转变为多孔碳，再通过铝合金和硅树脂的浸渍，制备了具有木材结构的Al/C、Al/两种铝基复合材料，并通过扫扫电镜、热膨胀仪和导热仅对复合材料的微观结构、热膨胀性能及导热性能进行了研究，建立了导热模型。

SEM micrographs showed that the PS colloidal crystal template spheres (diameters 275±10 nm) arrayed into hexagonally close-packed layers. The synthesized 3DOM SnO2 microparticles were circularly or hexagonally porous and the thin porous walls were formed by nanocrystals of SnO2. The macroporous diameters of the 3DOM SnO2 were between (215±10) nm and the thicknesses of the porous walls was between 20～30 nm.

SEM图表明PS胶晶模板微球排列规整，大小均匀(直径275±10 nm)，形成多层六方紧密堆积排列；煅烧除去模板后的3DOM SnO2呈三维多孔网络结构，具有圆型和六边形的孔隙形貌，其孔径大小为(215±10) nm；孔壁由SnO2纳米晶粒组成，壁厚为20～30 nm。

In chapter 2, we focus on derivation of the tortuosity models for flow of Newtonian incompressible fluid in two- and three-dimensional porous media with spherical, cubic and plate-like particles by applying the geometrical method. We first present the ideal geometrical models of porous media to show the ideal and representative streamlines based on the assumption that some particles in porous media are unrestrictedly overlapped and hence of different configurations, then the average tortuosity is derived by geometrically and weightedly averaging these representative flow paths.

第二部分采用几何分析法研究了二维和三维情况下的球形颗粒、立方体颗粒和板状颗粒多孔介质中流体流线的迂曲度，首先给出多孔介质的理想几何模型，通过分别考虑固体颗粒重叠时、不重叠时以及粒子的不同排列等情形时的流体流线，然后对这些理想代表性流线的迂曲度取几何平均和加权平均，最后推导出流体流过多孔介质的迂曲度解析表达式。

Porous asphalt concrete is composed of asphalt mastic, coarse aggregate, thin aggregate, stuff and admixture. Such a combination is expected to fully integrate these materials. In this way, the function of interlocking among particles can be performed, a firm net of porous asphalt framework formed and the ability to resist rut and wear developed. The different mixture results in different effects; the quality is so complicated that the factors that cause damage are multiple. Therefore, it is bothersome to choose one material that can be adjusted to various conditions everywhere, such as the traffic volume, load and the weather. The current study mainly investigates and analyzes the main factor that caused flaws after the roads paved with porous asphalt concrete have been open. The analysis aims to search for the best solutions, promote the quality, prolong its availability and finally reach the purpose of complete use.

多孔隙沥青混凝土依其组成材料由沥青胶泥、粗粒料、细粒料、填充料、添加物等组成，目的是希望藉由以上材料的组合能充分接触，发挥颗粒间互锁作用，形成牢固的连锁网的沥青混凝土架构，发挥粒料本身良好的抗车辙及抗磨损之能力，因添加物的不同所发挥出的效果亦不同，其性质甚为复杂，造成损坏之因素亦属多重性，要择其适用於各地迥异之各种条件，如交通量、荷载及气候环境等因子，极为繁琐，本研究主要探讨及分析已铺筑之多孔隙沥青混凝土铺面，经通车后产生之缺失主要因素，以寻求其最佳解决方案，提升品质与延长使用寿命，进而达到全面使用。

Porous alumina templates with different apertures were fabricated by changing the oxidation voltage in two-step anodic oxidation, and then Cu nanowires were synthesized in porous alumina by the alternating current electrochemical deposition method. The Cu/PAA was analyzed by SEM and XRD, the results have shown that Cu nanowires were indeed synthesized in porous alumina which had the same diameter and good structure of wire grating.

通过改变二次氧化过程中的氧化电压，制备了不同孔径的多孔Al模板；采用交流电沉积的方法，制备了含Cu阳极PAA膜。X射线衍射分析表明，阳极PAA膜上确有Cu生成；扫描电镜显示，Cu纳米线粗细均匀，具有很好的线栅结构。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。