酚磺乙胺对酶法测定肌酐结果的影响

采用加入硅硼玻璃相的溶胶-凝胶(Sol-Gol)技术,以无机物为原料,在低温下成功制备了Pt/Ti/SiO2/Si衬底上Bi3.15La0.75Ti3O12(BLT)铁电薄膜.XRD、AFM分析及电学性能的测i式结果表明,600～650℃退火处理的加入硅硼玻璃相BLT铁电薄膜具有单一的层状钙钛矿结构;薄膜表面平整无裂纹、致密,薄膜为多晶生长;其剩余极化强度(2Pr)为27.09 μC/cm2,矫顽场E约为53.1 kV/cm;室温下,在测试频率为1 MHz,经1.0×1011极化反转后,剩余极化值下降约10%,具有良好的抗疲劳特性;薄膜的漏电流密度低于9×10-10 A/cm2.玻璃相提高了薄膜的致密度和抗疲劳特性,降低了薄膜的漏电流密度,对剩余极化强度影响有限.     

BiFeO_3/Bi_4Ti_3O_(12)多层铁电薄膜的性能研究

采用sol-gel法在FTO/玻璃底电极上制备了BiFeO3/Bi4Ti3O12多层薄膜。研究了室温下薄膜的结构,铁电和漏电流性质。结果表明,相对于纯的BiFeO3薄膜,BiFeO3/Bi4Ti3O12多层薄膜具有更低的漏电流,表现出较强的铁电性,在4.40×105V/cm的测试电场强度下,剩余极化强度为3.7×10–5C/cm2。在2.00×105V/cm的测试电场强度下,BiFeO3和BiFeO3/Bi4Ti3O12薄膜的漏电流密度分别为10–5和10–7A/cm2。     

直接感光法制备锆钛酸铅镧薄膜图形及其性能

采用化学修饰溶胶凝胶工艺,以PVP为薄膜开裂抑制剂,以苯酰丙酮为化学修饰剂,利用其与金属盐形成的配位螫合物结构,合成了具有紫外光感应特性的锆钛酸铅镧(Pb0.91La0.09(Zr0.65Ti0.35)O3,PLZT)前驱溶胶;对单次提拉得到的凝胶薄膜进行直接感光法图形制备;通过后续热处理,在Pt/TiO2/SiO2/Si衬底上得到了具有钙钛矿结构的PLZT薄膜图形,其最终热处理后的膜厚约为260nm,剩余极化强度约为6.7μC/cm2,矫顽场强约为77kV/cm,相对介电常数约为356,介电损耗约为0.02,漏电流密度小于10-2μA/cm2,极化疲劳特性可达107以上.     

直接感光法制备锆钛酸铅镧薄膜图形及其性能

采用化学修饰溶胶凝胶工艺,以PVP为薄膜开裂抑制剂,以苯酰丙酮为化学修饰剂,利用其与金属盐形成的配位螫合物结构,合成了具有紫外光感应特性的锆钛酸铅镧(Pb0.91La0.09(Zr0.65Ti0.35)O3,PLZT)前驱溶胶;对单次提拉得到的凝胶薄膜进行直接感光法图形制备;通过后续热处理,在Pt/TiO2/SiO2/Si衬底上得到了具有钙钛矿结构的PLZT薄膜图形,其最终热处理后的膜厚约为260nm,剩余极化强度约为6.7μC/cm2,矫顽场强约为77kV/cm,相对介电常数约为356,介电损耗约为0.02,漏电流密度小于10-2μA/cm2,极化疲劳特性可达107以上.     

Au/PLT/Pt铁电薄膜电容的电学性能

用 Sol- Gel方法研制了 PL T[(Pb0 .83 L a0 .17) Ti O3 ]铁电薄膜 ,结合非挥发性铁电存储器对铁电电容的要求 ,研究了 Au/ PL T/ Pt铁电电容和漏电流、剩余极化、疲劳、开关特性和揭电常数等性能。对厚度为 0 .4 μm的薄膜 ,5 V时的剩余极化强度 Pr=2 2 μC/ cm2 ,矫顽场强度 Ec=6 0k V/ cm,相对介电常数约 130 0 ,漏电流 Id=3.2× 10 -8A/ mm2 ,开关特性优良。疲劳测试表明 ,对Vpp=10 V的锯齿信号 ,经 4 .5× 10 11周期后 ,剩余极化强度衰减 2 0 %。上述性能表明 ,该 PL T膜能用于非挥发性铁电存储器的试制     

ITO玻璃衬底上PLZT铁电薄膜的制备与电性能

用sol-gel法在掺Sn的In2O3导电透明膜(ITO)衬底上,制备了La掺杂的PbZr0.5Ti0.5O3(PLZT)铁电薄膜。研究了La掺杂量对薄膜的铁电、介电和漏电性质的影响。结果表明,x(La)为5%的PLZT薄膜经650℃退火,有优良的铁电特性,外加15V电压下,剩余极化强度为35.4×10–6C/cm2,矫顽场强为111×103V/cm。100kHz时的εr和tgδ分别为984和0.13。在外加电场小于9V时,薄膜的漏电流密度不超过10–8A/cm2。     

La掺杂对BLT薄膜微观结构与性能的影响

采用sol-gel工艺低温制备了Si基Bi4–xLaxTi3O12(BLT)铁电薄膜。研究了La掺杂量对薄膜微观结构、介电和铁电性能的影响。结果表明,600～650℃退火处理的BLT薄膜表面平整无裂纹,晶粒均匀,无焦绿石相或其它杂相,薄膜为多晶生长;La掺杂量x在0.5～0.85的BLT薄膜介电与铁电性能优良,其εr和tanδ分别介于284～289和(1.57～1.63)×10–2,4V偏压下薄膜的漏电流密度低于10–8A/cm2,Pr可达(13.0～17.5)×10–6C/cm2,Ec低至(102.5～127.8)×103V/cm。     

衬底对钛酸铋铁电薄膜生长及性能的影响

采用溶胶–凝胶工艺在Si和Pt/Ti/SiO2/Si两种衬底上制备了Bi4Ti3O12铁电薄膜,研究了衬底对Bi4Ti3O12铁电薄膜生长及性能的影响。研究表明:Pt/Ti/SiO2/Si基Bi4Ti3O12薄膜的剩余极化较高但易出现焦绿石相,而Si基Bi4Ti3O12薄膜易于沿c轴取向生长,有利于改善铁电薄膜与硅衬底之间的界面特性,但8mC/cm2的剩余极化却比前者有所降低。     

TiO_2过渡层对Bi_(3.54)Nd_(0.46)Ti_3O_(12)薄膜微观结构及电性能的影响

选取厚度为5、10和20nm的TiO2薄膜为过渡层,采用sol-gel法在Pt/Ti/SiO2/Si衬底上制备了Bi3.54Nd0.46Ti3O12(BNT)铁电薄膜,研究了过渡层厚度对铁电薄膜微观结构及电学性质的影响。结果表明,加入TiO2过渡层后,BNT薄膜微观结构得到改善,εr及2Pr值大幅提高,介电损耗及漏电流密度都有降低。过渡层厚度为20nm时,BNT薄膜的εr、tanδ及2Pr值分别为325、0.025(测试频率为10kHz)和36.1×10–6C/cm2,漏电流密度为8.45×10–7A/cm2(外加电场为100×103V/cm)。     

Nb和Co掺杂对PZT铁电薄膜电性能的影响

用sol-gel法在ITO玻璃衬底上制备了不同比例Nb和Co掺杂的PZT铁电薄膜,薄膜呈以(101)为首要方向的多晶结构。结果表明,Co掺杂的PZT薄膜的剩余极化强度、矫顽场强、相对介电常数和漏电流密度均大于PZT薄膜的相应值,但在掺杂x(Nb)为1%~10%内漏电流密度随着Nb掺杂比例的增加而减小,薄膜的剩余极化强度和相对介电常数也有所减小。     

Definition of function of squares amount of angular part of film element

By means of exact conformal mapping method we have defined character of dependence of squares amounts of angular part of film element on angled part dimension. We propose relations, approximating obtained dependence. Calculation results and experimental researches of large-scale models are represented.     

Temperature dependence of index of refraction of polymericwaveguides

The temperature dependence of refractive index of polymer films was determined for a number of slab waveguides by a grating coupling method. This dependence was examined as a function of parameters such as molecular weight and glass transition temperature of the polymer. Temperature-induced changes in N_TE-N_TM , N being the effective index, were studied systematically for different slab waveguide compositions. It is shown that with proper device design and choice of polymeric materials, thermal effects can be reduced     

Terminology of carcinogenesis in light of the current concepts of the mechanisms of action of chemical carcinogens

The approaches to prepare a uniform and unified scientific terminology of chemical carcinogenesis are presented. The main definitions proposed (carcinogen, initiation, promotion, mutagen, multistage carcinogenesis, anti-carcinogen, cocarcinogen, carcinogenic risk, etc.) are based on the current state of comprehending mechanisms of the action of chemical carcinogens.     

Application of model of mixture of probabilistic distributions for definition of the signals of radiophysical probing

The article describes a model representation of radar probing data in form of a mixture of background and target samples, which is the sum of two random variables with very different parameters. For model development we research the behavior of the central moments of the distribution mix without assuming the distribution law form. An example it is described the detection of the signal at the output of compression system of chirp ionosonde.     

部分偏振光的表示方法

随着光纤通信和光纤传感的快速发展,人们时光的偏振态提出了越来越高的要求.光是一种横波,其偏振态大致分为:完全偏振光、部分偏振光和自然光.文中介绍了完全偏振光的几种表示方法,给出了几种部分偏振光的描述方法.并阐述了它们之间的差异与联系.     

浅析IP网服务质量(QoS)

解决IP网QoS问题是目前通信领域的研究热点之一.虽然研究已经取得了一定的进展,但人们对于IP 网QoS本身的含义及相关的问题还有着不同的理解.本文将从IP网QoS的定义入手讨论相关的一些问题以及解决IP网QoS问题所做的各种努力.     

Interpretation of responses of visual cells of limulus

Assuming that visual responses are due to the action of particles on the membrane of the visual cells, the stochastic variability of the response should be a function of the number of particles producing it. Quantitative predictions can be made with the aid of a model proposed in previous articles. It is found that responses produced in visual cells of Limulus by absorption of a single photon have the stochastic properties which would be expected if the response to one photon were brought about by 25 particles. It is concluded from this that the processes leading to visual responses produce multiplication of particles. The effects of temperature and of metabolic poisons suggest that these processes are of chemical nature.     

NTRUsign式计算量分析

介绍了NTRUsign签名算法的密钥生成过程,其在实现的过程中需要进行上百位的大数运算问题,这些数字远远超出了普通电脑存贮范围。而要进行大数运算,就得用数组存贮,进行模拟运算,这就大大增加了运算量。文中分析了这个算法实现过程中的运算量,分析结果说明NTRUsign的运算量过大,以致实际并非一个实用算法。     

胸腹水快速电镜样品制备技术的探讨

随着病理电镜诊断工作的不断深入和发展，各类标本的快速制样工作成为首位重要的工作，我们在胸腹水电镜样品制备工作中，采用快速制样技术，改进工作流程，特介绍如下。