信号灯光的颜色

本文考虑了适合作为信号灯光的各种可能的颜色，并进一步给定了信号灯光颜 色的色坐标的区间。此外，还叙述了信号灯光的检测方法。     

膜厚对FeCoAlON薄膜的静态与动态磁性的影响

采用射频磁控溅射法在Si(100)基片上沉积了不同氮分压和不同厚度的(Fe70.6Co29.4)88.2Al11.8-ON薄膜,研究了膜厚对5%氮分压沉积的薄膜静态与动态磁性的影响。当FeCoAlON薄膜的厚度较小时,薄膜表现出面内单轴磁各向异性,当薄膜厚度增加到210 nm时,薄膜出现了条形畴。动态磁性研究显示,对于面内单轴磁各向异性以及条形畴结构的FeCoAlON薄膜,都表现出优异的高频响应。特别地,对于具有条形畴结构的FeCoAlON薄膜,其磁谱曲线表现为多峰共振的特点。     

浸渍纸与薄膜介质的介电常数与介质损耗角正切的计算

本文讨论了以往在浸渍纸及浸渍薄膜介质ε,tgδ计算中存在的问题,并提出了改进意见。还特别讨论了薄膜粗化以及油膜相互作用对ε、tgδ计算公式产生的影响。该文给出的推荐公式可供电容器设计时参考。     

薄膜锂电池的研究进展

适应微系统的需要发展起来的薄膜锂电池,具有很高的比容量和很长的循环寿命,是真正的全固态电池.集成到微电子线路板上,使其应用非常广泛.概述了薄膜锂电池的基本制备工艺、应用领域和薄膜锂电池的研究及产业化的状况.     

高频低介电半脂环聚酰亚胺薄膜的制备与性能

针对高频通讯领域对聚酰亚胺(PI)薄膜材料的应用需求,以半脂环二胺5(6)-氨基-1-(4-氨基苯基)-1,3,3-三甲基茚满(DAPI)与不同的芳香二酐反应,合成了含半脂环结构的PI并制备了对应薄膜,探究了其结构与性能的相关性。结果表明：含半脂环结构的PI具有良好的可溶解加工性,能溶于NMP、DMF、CHC13等常规有机溶剂。制备的薄膜具有良好的力学性能和耐热性,拉伸强度为64.8～82.6 MPa,玻璃化转变温度最高可超过487℃。薄膜的介电常数(D_k)为2.63～4.62(1 kHz～1 MHz)、2.46～2.75(10 GHz),介质损耗因数(D_f)为0.003 1～0.020 5(1 kHz～1 MHz)、0.006 6～0.017 4(10 GHz)。其中,薄膜B-PI(BPADA-DAPI)在10 GHz下的介电常数为2.75,介质损耗因数为0.006 6,表明在PI分子主链上同时引入半脂环和双酚A结构能制备兼具高频低介电常数、低介质损耗的PI薄膜。     

金属化薄膜电容器损耗角正切的测量与评价

电容器的损耗是由介质损耗和金属损耗二部分组成,损耗角正切(tanδ)是金属化薄膜电容器重要技术参数,如果通过测试能找出引起损耗超标的原因,将有利于产品质量的持续改进提高。通过简化电容器的等效电路和采用不同频率的测量分析,可定性判定损耗角正切超标的原因,同时指出测量金属化薄膜电容器损耗角正切(tanδ)应着重于产品的一致性和试验后增量,对于追求"越小越好"的观点需要改变。     

三基色白光LED光源颜色稳定性的研究

在介绍LED光谱特性及色品坐标的基础上,针对三基色白光LED光色不稳定问题,分析了温度对不同材料、不同颜色组成白光的三基色LED光谱特性及色度坐标的影响。利用混色方程,验证了通过对三基色组成LED光通量比例的控制可以使三基色白光的颜色满足约束条件,达到颜色稳定的目的。     

聚酰亚胺薄膜的介电性能调控研究进展

聚酰亚胺作为一种特种工程塑料,因其优异的介电性能、力学性能及耐热稳定性而广泛应用在电工绝缘、电子等领域.通过分子结构设计和优选单体,可以调控聚酰亚胺的分子链结构,从而获得具有优异热稳定性和介电性能的聚酰亚胺薄膜.本文综述了调控聚酰亚胺介电性能的分子结构设计策略及聚酰亚胺结构对其介电性能的影响机制,并对介电性能调控的研究方向进行了展望.     

Undergraduate Thick Film Hybrid Circuit Layout Design and Fabrication

This paper describes that portion of an undergraduate laboratory course in which the layout of an active, thick film hybrid circuit is designed and the circuit is fabricated. Design and fabrication procedures are presented together with suggestions for alternative means of accomplishing the same or similar tasks. It is shown that only a modest amount of specialized equipment is required.     

Annealing and Microstructural Characterization of Tin-Oxide Based Thick Film Resistors

The sheet resistance of tin oxide based thick-film resistors exhibits two regions of temperature-dependence, described by hopping (23°C–200°C) and diffusion mechanisms (200°C–350°C), respectively. Annealing these samples causes the sheet resistance to increase in both regions. In the post-annealed samples, the hopping conduction range is extended by 50°C (23°C–250°C) while the hopping parameter, T ₀, is decreased by more than 50%. The activation energy of diffusion (0.60 eV) is the same for both pre- and post annealed samples, but the magnitude of resistance in the diffusion controlled region is increased significantly as a result of annealing. These changes are explained in terms of a net decrease in the concentration of tin ions in the glass matrix. From a careful microstructural study it was found that a conduction path composed of tin-oxide grains or their clusters in contact with each other does not exist in the present system. HREM micrographs showed the presence of nanocrystalline tin-oxide particles in the glass phase separating the tin-oxide grain clusters. Estimated average separation between the nanocrystals in 4 nm, consistent with a variable-range hopping conduction via the dissolved tin ions in the glass matrix.     

Screen Printed PZT Thick Films Using Composite Film Technology

A spin coating composite sol gel technique for producing lead zirconate titanate (PZT) thick films has been modified for use with screen printing techniques. The resulting screen printing technique can be used to produce 10 μm thick films in a single print. The resultant films are porous but the density can be increased through the use of repeated sol infiltration/pyrolysis treatments to yield a high density film. When fired at 710°C the composite screen printed films have dielectric and piezoelectric properties comparable to, or exceeding, those of films produced using a ‘conventional’ powder/glass frit/oil ink and fired at 890°C.     

高压ZnO厚膜压敏电阻的制备及导电机理分析

通过高能球磨、丝网印刷和低温烧结制备出高压ZnO厚膜压敏电阻,并对厚膜试样进行了电学性能、物相成分和微观形貌的表征。结果表明:厚膜试样电位梯度达到3 159.4 V/mm,漏电流为36.4μA,非线性系数为13.1,平均晶粒尺寸为1.29μm。高能球磨和低温烧结使厚膜试样的晶粒尺寸大大减小,有效提高了电位梯度值。分析了厚膜压敏电阻单晶界体系的导电机理,发现预击穿区势垒宽度的增加和单晶界电压的提高对其非线性性能以及压敏电压的提升影响明显,决定了压敏电阻的电学特性。     

Development of Resistive Oxygen Sensors Based on Cerium Oxide Thick Film

It is important to shorten the response time of resistive oxygen sensor in order to reduce harmful emission of automobiles. The diffusion and surface reaction theory tells us that reducing particle size leads to shortening the response time. The fine ceria powder was prepared a by new precipitation method and the oxygen sensors having ceria thick film with the particle size of 120 nm were fabricated using fine ceria (cerium oxide) powder. The thick film exhibited good adhesion to alumina substrate. The value of n in R P(O₂)^1/n at 1073 and 1173 K were 6.2 and 6.4 in the oxygen partial pressures range from 10^{– 13} to 10⁵ Pa, respectively. The response time for the sensor was 22 and 12 ms at 1073 and 1173 K, respectively. The sensor fabricated in this study showed fast response.     

Microstructural Control of BaTiO3 Thick Film Fabricated by Utilizing Slide-Off Transfer Printing

Effects of fabrication conditions on the microstructure of thick BaTiO₃ films have been investigated by employing slide-off transfer printing technique. Formation of dense films with good adhesive properties was difficult when screen-printing was employed in preparing the slide-off transfer sheets (BaTiO₃ green films), irrespective of the kind of solvents used for the slurries. On the other hand, relatively dense films could be fabricated from the slide-off transfer sheet prepared by spin-coating of the slurries consisting of fine BaTiO₃ powder (particle size: ca. 0.1 m), printing oil, and 2-propanol, though cracks formed obviously. Co-addition of large BaTiO₃ particles (particle size: ca. 0.5 m) was very effective for reducing the formation of cracks, and homogenous and dense films could be fabricated by controlling the additive amount of the large particles.     

Current-Voltage (I-V) Characteristics of Poly(vinylidene fluoride)/Potassium Nitrate Composite Thick Film

This article describes the experimental results of the polyvinylidene fluoride (PVDF)/Potassium nitrate (KNO₃), composite films. To explain the nature of ferroelectric phase (phase III) of potassium nitrate (KNO₃), we have prepared the composite films of poly (vinylidene fluoride)/potassium nitrate in the relative amount of 50–50 wt.% by using simple melt pressing. The results of the temperature dependence of the capacitance and conductance of the composite films have been carried out. The current vs. voltage (I-V) characteristics exhibit the polarization current, which is the nature of ferroelectricity in the composite films. Capacitance vs. voltage (C-V) measurements have been performed to identify the ferroelectric properties of the composite films.     

彩色复制中的色域映射

由于各种颜色设备能表现的颜色范围，即色域各不相同，用一个设备复制另一个设备的颜色时，可能无法原样再现。为了尽可能减少这种颜色失真，在复制前需进行设备间的色域映射操作，本文举例介绍了当前颜色复制系统中的色域映射技术和算，分析比较了各种方法及色域映射中的相关问题。     

UNIDRIVER驱动器在厚板厂的应用

鞍钢厚板厂热处理区域有4组控制钢板冷却辊道(以下称控冷辊道),分别由4台交流电动机拖动.利用英国CT公司生产的UNIDRIVE变频器,实现辊道的高速送钢和辊道低速摆动控制冷却钢板功能.