We have proved that the surface energy induced by the flexoelectric effect has the same form but inverse sign at the up or down substrate . the expressions of the threshold voltage and the saturated voltage which have correlation with e1 + e3 ( the flexoelectric coefficients ) 给出了阈值电压和饱和电压的表达式，它们都与e _ 1 + e _ 3 (挠曲电系数)有关，即挠曲电效应将导致阈值电压和饱和电压的变化。
The study indicates that there are some differences between the multilayered films and the uniform films in the dielectric constant - frequency relation and capacitance - voltage chara cteristics . the report also analyses the mechanism of dielectric enhancement of the multilayered thin films prepared by the sol - gel process 研究同时表明， batio _ 3 srtio _ 3多层膜与单层膜的介电频率色散程度、 c - v特性和介电系数与温度的关系均略有不同。
It is capable to lower the insertion loss by using high conductivity electrode material and increasing the electrode thickness and quality factor of bst capacitor . at the same time increasing the tunability of the dielectric constant and the length of the transmission line can increase the phase shift 通过使用高电导率的电极材料、增加电极的厚度、提高bst薄膜电容的q值可以实现器件插损的降低；增大薄膜的介电系数变化率和传输线长度可以增加移相度。
The chip of microbridge structure thermocouple type microwave power sensor is designed by using seeback domino offect of thermocouple . ta2n of relatively low resistor - temperature coefficient and si of relatively high thermoelectric power seebeck coefficient are used as thermocouple materials in the chip 微梁结构热偶微波功率传感器芯片就是利用热偶的塞贝克效应设计的，芯片选择具有低电阻温度系数的ta2n和具有高热电系数的半导体单晶si作为热偶材料。
The results are as follows : ( 1 ) bst thin film prepared by pulsed laser deposition is well crystallized . the average grain size is 100nm and the surface roughness is about 10nm . when the electric field intensity is 3v / , the tunability of the thin film is about 30 % and the loss tangent is about 20 % under room temperature 研究结果如下： （ 1 ）采用脉冲激光沉积法制备的bst薄膜结晶良好，晶粒尺寸在100左右；表面粗糙度约为10 ；室温下，当直流电场为3v /时介电系数变化率约为30 % ，介质损耗约为20 % 。
We also find that the strong long - range interaction , the large transverse field and weak interfacial coupling can lead to the disappearance of some of the peaks of the pyroelectric coefficient and susceptibility of the ferroelectric bilayer . we believe that it is the reason why these phenomena always take place in the experimental studies 我们还发现，较强的长程相互作用，较大的横场以及相对较弱的界面耦合作用将会导致铁电双层薄膜的热电系数和介电极化率的某些峰消失，这可以用来解释在实验中常常观测不到热释电系数和介电极化率的某些峰值的原因。
In 6 . 635 , topics covered include : special relativity , electrodynamics of moving media , waves in dispersive media , microstrip integrated circuits , quantum optics , remote sensing , radiative transfer theory , scattering by rough surfaces , effective permittivities , random media , green ' s functions for planarly layered media , integral equations in electromagnetics , method of moments , time domain method of moments , em waves in periodic structures : photonic crystals and negative refraction 本课程所覆盖的论题包括：狭义相对论、运动媒质的电动力学、色散媒质中的波、微带集成电路、量子光学、遥感、辐射传输理论、粗糙表面上的散射、有效介电系数、随机媒质、平面层状媒质的格林函数、电磁学中的积分方程、矩量法、时域矩量法、周期结构中的电磁波：光子晶体和负折射率。
This kind piezocomposite not only possesses properties of the piezoelectric ceramic and the polymer , but also overcomes the disadvantage of each single material . it contains many fine properties such as the high piezoelectricity , low brittleness , density and dielectric constant . and it also can be easy made into various shape products and thin slice 由于这种复合材料兼有组成复合材料各组分的性能，克服了陶瓷和聚合物两者的不足，具有强压电性、脆性低、密度和介电系数低、易制得大面积薄片以及复杂形状制品，制造工艺简单等优点。
Nanosized lead titanate ( pt ) and lead titanate doped with calcium and lanthanum ( pclt ) powder obtained by the sol - gel method was added into vinylidene fluoride - trifluoroemylene [ p ( vdf - trfe ) ] to form nanocomposite to be used as the sensing film of the pyroelectric detector . the experiment results show that after mixing in 0 . 16 volume fraction of pclt powder , the pyroelectric coefficient of pttp ( vdf - trfe ) composite film was about 37 % higher than that of the pure p ( vdf - trfe ) film prepared under the same condition , and the voltage figure - of - merit of pt / p ( vdf - trfe ) composite film was about 22 . 4 % higher 用溶胶-凝胶法制备了钛酸铅( pt )和掺钙钛酸镧铅( pclt )纳米粉粒，与聚偏氟乙烯-三氟乙烯( p ( vdf - trfe )均匀复合，由于16的掺钙钛酸镧铅纳米陶瓷粉粒的掺入，使得pclt / p ( vdf - trfe )复合膜的热释电系数值提高了约37 ，探测优值提高了约22 . 4 。
Diamond is a remarkable material due to its special crystal structure , which shows high hardness , low friction coefficient , high thermal conductivity , high optical transparency , low permittivity and high band gap etc . cvd diamond films are widely used in mechanical coating , heat sinks , optical window , semiconductor devices and other application fields because of its low price and high performance 金刚石的特殊晶体结构使其成为一种性能优异的功能材料，它具有高硬度、低摩擦系数、高热导率、高透光率、低介电系数和高禁带宽度等性质。化学气相沉积制备金刚石膜成本低、质量高，广泛应用于工具涂层、热沉、光学窗口、半导体器件等方面。
