查询词典 dielectric

The results indicate that high frequency dielectric relaxation of the ferroelectric ceramics is caused by piezoelectric resonance of domains.

实验研究表明，铁电陶瓷的高频介电弛豫主要是由材料内部的畴壁共振引起的。

ABSTRACT The diffused phase transition and frequency dispersion of Pb-based complex perovskite relaxor ferroelectrics of PZN, PMN etc. were studied by the measurements of spectum of dielectric permittivity with temperature at different frequencies as well as by the means of differential thermal analysis and ferroelectric hysteresis technique. It was found that there are various polarization relaxors which cause DPT characteristics.

本文利用介温谱的测量，差热分析和电滞回线对以PZN，PMN为代表的铅系复合钙钛矿型弛豫铁电体的相变弥散和频率色散性等弛豫特性进行了分析研究，对产生弛豫的根本原因提出了新的看法，认为这类材料的DPT特性并不是一种由成份及结构不均匀的统计分布所造成的&准&弛豫现象，而是由材料本身弛豫机制所致。

It is a kind of inside heating by means of dipole's changeable polarization and polarization of interface of the medium, which have the dielectric loss in microwave heating.

微波对物质的作用很复杂，作为加热能源，它是靠介质的偶极子转向极化和界面极化在微波场中的介电耗损而引起的体内加热。

The acceleration of chemical reaction with the radiation of microwave is caused by not only the dielectric heating,but also the athermal action.

微波加快化学反应速度除了微波对反应物的加热以外还有非致热的作用。

The initial saturation plays different role in drying process for different structure form of porous media under the conditions with and without dielectric core heating.

对于干燥不同形状的物料时，初始饱和度对有、无电介质核情况下所起的作用也均有不同。

Many studies in the past decade on organic synthesis by microwave irradiations showed that this was because of dielectric heating effects of microwaves, while some other studies suggested that non-the...

近年来在有机合成领域中，已有许多应用微波电介质加热效果的例子报道。

Additionally, morphological structure and properties of the TiO_2 prepared by using the conventional heating and microwave dielectric heating were also compared detailedly. Acetaldehyde was chosen as a model reactant to valuate the performance of the samples.

通过自行设计的微波-光催化反应器，在功率100~170 mW、频率36 GHz 的微波和紫外光同时存在下研究了TiO_2对乙醛的光催化氧化性能，并与单纯紫外光存在下的光催化过程进行了比较。

A homogeneous dielectric structures due to internal heating is different from the thermal deformation can not be freedom it will produce heat stress; a heated uniformly inhomogeneous media due to the different coefficient of thermal expansion will produce thermal stress; and thermal structure is more subject to external constraints is to generate thermal stress causes.

一个均匀介质结构由于内部受热不同，其热变形不能自由进行时，将会产生热应力；一个受热均匀的非均匀介质结构，由于热膨胀系数不同，也会产生热应力；而热结构受到外部约束更是产生热应力的原因。

So far, we human beings for the heating of the concept has long been restricted to convection, conduction, radiation three kinds of surface heating in it, in recent years the use of molecular friction between the object itself is heated and heat of the principle of the developed in the dielectric heating (including the high-frequency and microwave heating) has been widely used in industrial heating and drying purposes above, this heating method unlike the aforementioned three kinds of methods, the heat do not penetrate the surface, but will wear the electromagnetic energy directly to transparent objects into heat inside a method, also known as the fourth heating methods

到目前为止，我们人类对于加热之观念一直都被局限于&对流&、&传导&、&幅射&三种表面加热方法而已，近年来利用&被加热物体本身分子磨擦生热之原理&所发展出来之诱电加热被广泛应用于工业加热干燥用途上面，此种加热方法不像前述之三种方法，热量不需要穿透物体表面，而是将电磁波能量直接穿透物体内部转换成热量的一种方法，也被称为第四种加热方式

The following main results are obtained: The TiO_2 photocatalyst with small crystallite size, high surface area, narrow and uniform pore size distribution, and microporous frameworks could be prepared out by applying MW radiation in the preparation process. The microwave-induced fluorescence technique verified for the first time that microwave enhanced the formation rate of hydroxyl radical, leading to the increase in the photocatalytic efficiency. Compared with the conventional catalyst, TiO_2 prepared by MW dielectric heating owns a higher UV absorption ability, and its optical absorption edge and photovoltaic response are shifted toward the short wavelength region, resulting in increase of photooxidation efficiency. The photocatalytic conversion and the mineralization ratio of acetaldehyde are increased respectively by 30% and 40% over the TiO2 prepared by MW radiation when compared to the TiO2 prepared by the conventional heating. For the MW-assisted photocatalytic reaction over the MW-prepared TiO2, production of hydroxyl radicals is enhanced by 22.5%, and the photocatalytic conversion is accordingly increased by 20%. Similarlly, applying MW also increased the photocatalytic conversion and the mineralization ratio of acetaldehyde over TiO2/Al2O3 sample.

论文得到如下主要结果和结论：(1)微波介电加热TiO_2 溶胶可得到晶粒度小、光催化活性高、比表面积大和孔径分布窄而均一，且微孔发达的TiO_2光催化剂；在溶胶干燥处理过程中微波可使催化剂表面缺陷增加，进而导致光催化反应过程有更多的活性羟基自由基产生；(2)微波制备能显著增强TiO_2 样品的紫外光吸收率，并使其光吸收和光伏响应阈值发生蓝移，从而提高TiO_2的氧化还原能力；(3)与常规加热法所制TiO_2比较，微波法制备的TiO_2对乙醛的光催化降解转化率提高30%，CO_2生成率提高40%以上；(4)与未加微波辐射时相比，发现在光催化反应过程中施加微波，TiO_2 的羟基自由基生成速率提高了22.5%，相应CH_3CHO 光催化降解转化率提高了20%；对Al_2O_3/TiO_2催化剂，CH_3CHO 光催化降解转化率甚至提高了33%，同时CO_2 的生成率也都大幅度提高；(5)微波辐射可改变光催化降解乙醛的产物分布，推断施加微波时乙醛光催化降解按照羟基自由基引发的链式反应机理进行，微波&非热效应&起主要作用。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。