Crystallization and conductivity mechanism of ITO films on different substrates deposited with different substrate temperatures

ITO thin films were grown on PC(polycarbonate), PMMA(polymethyl methacrylate) and glass substrates by r.f. magnetron sputtering. The electrical, structural and chemical characteristics of ITO films were analyzed by the Hall Technique, X-ray diffraction, and X-ray photoelectron spectroscopy. XPS studies suggest that all the ITO films consist of crystalline and amorphous phases. The degree of crystallinity increases from less than 45% to more than 90% when the substrate temperature increases from 80 to 300 ℃. The In and Sn exist in the chemical state of In3+ and Sn4+, respectively, independent of substrate type and temperature. The enrichment of Sn on surface and In in body of ITO films are also revealed. And, the oxygen deficient regions exist both in surface layer and film body. For ITO films deposited under 180 ℃ , the carrier concentration are mainly provided by oxygen vacancies, and the dominant electron carrier scattering mechanism is grain boundary scattering between the crystal and the amorphous grain. For ITO films deposited over 180 ℃, the carrier concentration are provided by tin doping, and the dominant scattering mechanism transforms from grain boundary scattering between the crystal grains to ionized impurity scattering with increasing deposition temperature.     

日盲区紫外光非视线传输模型

为建立一个更接近实际情况的紫外光非视线传输模型,用来处理复杂的大气条件和边界条件,建立了基于Monte Carlo方法的紫外光非视线传输快速算法模型。分析了发射功率为1 W的单色紫外光信号在不同环境条件下的脉冲响应函数和边界条件对信号强度空间分布的影响,以及系统发射仰角和接收仰角与探测信号强度的关系。与单次散射模型比较,该模型具有更高的精度和边界处理能力。对合理涉及通信系统、提高通信质量都有很大提高。     

InSAR中DORIS基线估计方法的改进

雷达干涉测量中基线估计精度直接影响到合成孔径雷达干涉测量(InSAR)的精度.针对DORIS(the delft object-oriented radar interferometric software)软件采用的基线估计方法,在考虑地球参考椭球半径在不同纬度地区的差异时,分析了基线估计方法的差异,提出相应的改进方法,对干涉影像不同扫描行的基线进行了多参数-多项式拟合,最后使用德国波恩地区的数据进行验证.结果表明:当考虑参考椭球半径在不同纬度差异时,能够显著提高基线估计的精度;而对基线的拟合则可以提高基线估计的速度.     

南天山与西昆仑帕米尔冲断带的空间对接关系研究

利用人工和天然地震剖面解释,地面地质资料分析,研究了位于塔里木盆地西北缘的南天山与西昆仑帕米尔冲断带的空间对接关系.结果表明:在浅层阿图什与克拉托—明尧乐背斜带之间是来自于南天山与西昆仑帕米尔冲断带的构造结合带,南天山冲断带可分为浅层叠瓦式冲断系统和深层的隐伏双重冲断系统,西昆仑帕米尔冲断带以乌泊尔基底断裂为界分成北部的克拉托—明尧乐背斜带和南侧的乌泊尔背驮盆地;在深层塔里木地块受到新生代以来印度板块与欧亚板块的碰撞和乌泊尔右行走滑断裂的控制作用,产生南北两侧的双向大陆深俯冲作用,致使南天山与西昆仑仰冲于塔里木地块而抬升,形成南北两大新生代复活造山带.     

大规模浒苔无害化处置过程中次生污染控制对策

青岛近海2008年爆发大规模浒苔,对社会、经济的发展均产生了较大影响.在紧急情况下,浒苔采取临时堆存和填埋的处置方式,实践证明是可行的选择.针对浒苔处置过程中的次生污染,提出了污染控制对策.首先从堆存和处置场选址角度考虑渗滤液和恶臭气体的环境影响,其次渗滤液可采用合并处理和稀释后农用的方式实现无害化处理,恶臭气体污染问题应考虑进行覆盖和生物除臭方式消除影响.已经堆存和填埋浒苔可考虑采用开挖后堆肥和沼气池利用的方式实现无害化综合利用.     

轮胎压力智能检测与预警系统的设计

在充分考虑降低轮胎压力检测系统的功耗,减小轮胎压力检测系统的质量和体积的基础上,应用传感器技术、微电子技术、嵌入式技术和射频通信技术等设计了一种新型的轮胎压力智能检测与预警系统;在系统设计上采用模块化思想,主要包括了信号采集、基站与端机的设计、射频通信模块的设计、显示和键盘模块的设计和数据处理等;轮胎压力智能检测和预警系统可以明显的提高汽车行驶的平缓性、安全性和舒适性,具有非常广泛的应用前景.     

Adsorption breakthrough of benzene in the fixed bed of modified activated carbon under different humidity conditions

The breakthrough curves of benzene and water on modified activated carbons (ACs) were investigated. Temperature-programmed desorption (TPD) experiments were conducted to measure the TPD curves of benzene and water on modified and unmodified ACs and to estimate the activation energy for the desorption of benzene on the modified ACs. Starting with unmodified ACs, two modified ACs were prepared by using two different types of silane, designated by KH560 and 1706. The results showed that the activation energy for the desorption of benzene on KH560/AC and 1706/AC was higher than that on unmodified AC. In addition, the activation energy for the desorption of water on KH560/AC and 1706/AC was lower than that on unmodified AC. The breakthrough curves of benzene obtained from the experimental observations under different humidity conditions were compared with the results of the TPD experiments. The results show that the modified ACs are less affected by water, whereas the unmodified ACs are more affected by water, indicating that surface modification by organosilane compounds can improve the adsorption of benzene on the activated carbo, which weakens the adsorption of water.     

DS-CDMA水声通信多用户检测空时自适应均衡算法

在具有扩展多径与快速时变特性的水声信道环境中,文章对采用直接序列码分多址的多用户网络水声通信进行研究。提出了2种自适应均衡算法:串行干扰抵消符号判决反馈空时二维均衡(SIC-ST-SDFE)算法与串行干扰抵消码片假设反馈空时二维均衡(SIC-ST-CHFE)算法。两算法分别基于符号速率与码片速率更新均衡器系数,同时通过交叉反馈滤波器实现SIC多用户检测。仿真与湖上实验结果显示,DS-CDMA系统采用上述算法,具有较传统非中心化空时均衡算法更强的MAI抑制能力,其中SIC-ST-CHFE以增加计算复杂度为代价,可获得更强的信道时变跟踪能力。提出的算法在5 km浅水信道、两用户配置且接收信噪比分别为0 dB与7 dB的实验条件下实现了信息的可靠接收检测。     

一种组态式产品设计方法

为了实现产品的快速定制和设计知识的重用,以进一步提高设计效率,促进产品配置的智能化,在模块化的基础上,文章提出了一种组态式的产品设计方法。对组件、组态概念进行了界定;对组件化方法、组态过程进行了阐述;并给出了组态系统的方程。最后,以某工装夹具的组件化和组态过程为例,详细说明了组态设计的基本原理和方法。     

双热中子束流治疗孔道低浓化BNCT堆初步设计

以我国已经建成的高浓铀为燃料的BNCT堆为研究对象,将其堆芯低浓化并且添加水平热中子双束流治疗孔道,开展双热中子束流BNCT堆堆芯低浓化初步设计,计算分析该BNCT堆的keff、控制棒价值、顶铍效率、堆芯能谱、堆芯径向通量、轴向通量、辐照管通量等参数,得到双热中子束流治疗孔道低浓化BNCT堆初步设计方案.