饱水石灰岩骨架和流体弹性参数的估算

本文利用Niu等提出的基于临界孔隙度模型的组分弹性参数数值计算方法,把测试岩石样品的孔隙度、整体密度、纵波速度和横波速度作为数值计算的输入数据,运用双线性数值计算方法反演求出临界点、流体和骨架的12个弹性参数。具体做法是:基于临界孔隙度模型,给出三组线性关系,即密度—孔隙度,整体剪切模量—孔隙度,整体纵波模量—孔隙度,上述每组线性关系分别以孔隙度作为自变量和因变量得到两个线性方程,再把两个方程计算的结果进行加权平均得到相关的弹性参数估算值,并结合饱水石灰岩样品数据实现了弹性参数估算。数值计算结果表明,由数值计算得到的弹性参数与测试弹性参数的均值和方差相差甚微,特别是密度数据的偏差均值更小,说明文中的数值计算结果是可靠的。     

MEUF去除废水中重金属和有机物及其浓缩液的处理

胶团强化超滤(MEUF)是一种表面活性剂和超滤相结合的处理含重金属或有机污染物废水的新技术。详细介绍了MEUF技术的原理、表面活性剂的选择、影响处理效果的主要因素,同时针对MEUF技术目前存在的浓缩液处理和表面活性剂回收的问题作了详细的阐述,综述了近年来MEUF技术应用的最新研究成果,并就此技术存在的问题和发展前景作了相关分析,实践表明该技术具有很好的应用前景。     

High-power Mode Converter of Overmoded Bent Circular Waveguide

Based on the mode coupling theory, a TE₀₁—TM₁₁ mode converter was designed and optimal results were obtained. In this paper, bandwidth of mode converter with axis exponential structure is the largest, and mode converter with axis sinusoidal structure is the most compact in the case of the center frequency is 28GHz and the waveguide radius is 16mm. If the bending angle between input port and output port of mode converter was demanded for 90°, mode converter with axis parabola structure had the characteristics of compact structure, higher mode purity and larger relative bandwidth. Meanwhile, we found that the converter could be also used as TE₁₁ mode transition with transmission efficiency above 99%. But due to bending angle of this structure was restricted, its center frequency and waveguide radius had the obvious corresponding relation.     

AND:Rubrene发光层的有机电致白光器件

利用9,10-bis(2-naphthyl) anthracene(AND)掺杂rubrene作为器件单一发光层,研制成功单层白光器件。器件在电流密度为140mA/cm2时,电流效率达到5.93cd/A;当电压为21V时,该器件达到最高亮度9300cd/m2。器件发光色坐标为(0.32,0.40),且随着电压的变化发光色度始终处于白光区。这种器件的白色发射是来源于AND(蓝色发射)和rubrene(橙色发散)的混合发射。与此同时,AND和rubrene二者之间会发生Frster能量传递。     

EV-DO信道估计选径策略探讨

EV-DO是高通公司在cdma2000基础上提出的基于提高分组数据性能的系统标准。文章从数据业务和传统的语音业务的比较说起,介绍了EV-DO系统中区别于cdma2000的技术特征(包括自适应编码、快速自动重复请求机制(ARQ)、速率控制、时隙导频工作方式等),并以此平台为例阐述了信道估计中的选径意义和策略,最后简单分析不同选径策略的性能,其中选径策略的讨论是基于带导频信道的无线系统平台而提出的,具有一定的普遍性。     

太赫兹量子级联激光器有源区有限元模拟

采用有限元分析法解决了太赫兹量子级联激光器(THz QCL)有源区模拟问题。由于InP基差频THz QCL有源区为千层纳米结构,无法拆分实验探索,因此模拟分析显得尤为必要。首先列出有源区量子结构的薛定谔方程,而后采用Galerkin有限元法改写薛定谔方程,再根据连续性和边界条件,得到本征值矩阵方程,最后采用Matlab写出运算程序求解本征值矩阵方程,求出波函数。针对不同有源区量子结构,设定材料、组分、厚度和周期数及外加偏压等参数,即可得到波函数模方、能级、频率和波长等模拟结果。选取InP基差频THz QCL结构进行验证,结果表明此模型切实可行,其拓展应用也可以解决GaAs THz QCL模拟问题。     

The Impact of Cooperative Nodes on the Performance of Vehicular Delay-Tolerant Networks

Vehicular communications refer to a wide range of networks proposed for environments characterized by sparse connectivity, frequent network partitioning, intermittent connectivity, long propagation delays, asymmetric data rates, and high error rates. These environments may also be characterized by a potential non-available end-to-end path. To overcome these issues and improve the overall network performance, cooperation between network nodes must be severely considered. Nodes may cooperate by sharing their storage capacity, bandwidth, or even energy resources. However, nodes may be unwilling to cooperate due to a selfish behavior or to an intent to protect the integrity of their own resources. This selfish behavior significantly affects the functionality and performance of the network. This paper overviews the most recent advances related with cooperation on vehicular networks. It also studies the impact of different cooperation levels in the performance of Vehicular Delay-Tolerant Networks (VDTNs). It was shown that scenarios with a higher number of cooperative nodes present the best results in terms of bundle delivery delay.     

Scalable 3D Self-Assembly of MXene Films for Flexible Sandwich and Microsized Supercapacitors

The self-assembly of large-area MXene films is the main step to realize their applications in various energy storage devices. However, the scalable self-assembly of flexible thin MXene films with high conductivity as well as excellent mechanical and electrochemical properties is still a challenge. Herein, a synchronous reduction and self-assembly strategy to fabricate flexible MXene films is developed, where MXene films are synchronously reduced and self-assembled on the Zn foil surface. Furthermore, the self-assembly of MXene films can be scaled up by controlling the area of Zn substrates. By adjusting the patterns of Zn substrates, the interdigital MXene patterns can also be obtained via a selectively reducing/assembling process. The resultant MXene films demonstrate high electrical conductivity, large specific surface area, and excellent mechanical properties. Thus they can serve as the electrodes of flexible supercapacitor devices directly. As a proof of concept, flexible sandwich and microsized supercapacitors are designed based on the above MXene film electrodes. Both sandwich and microsized supercapacitors display stable electrochemical performance under various bending states. This study provides a route to achieve large-area MXene-based films or microsized structures for applications in the field of energy storage.     

Android手机虚拟机平台虚拟管道的研究与设计

论述了Android手机虚拟机平台上双操作系统之间通过虚拟管道(Vpipe)实现通信的过程。为了满足用户对高性能移动终端的需求,提出了一种可靠性强、效率高的虚拟管道以实现移动终端上双操作系统通信功能的技术方案。该方案的难点在于NV数据的存储、管道的设计以及采用多通道的方式,保证操作系统之间数据的正确交互。     

综合孔径辐射计可见度函数预处理算法及时域仿真研究

该文研究了干涉式综合孔径辐射计可见度函数的预处理算法,包括A/D偏置校正、三阶数字相关系数到模拟相关系数的校正、IQ非正交校正以及空间去相关的误差校正等等。由于这是首次将三阶量化数字相关的定标方法应用于对地观测领域,对其进行了详细的分析。该文利用蒙特卡洛方法对可见度函数的预处理算法进行了时域仿真的研究。并通过地球同步轨道毫米波大气温度探测仪地面样机系统对算法进行了验证,证明了该算法的正确性。经过可见度预处理算法校正得到的结果的绝对误差小于真值的0.1%。证明该算法可以应用于地球同步轨道毫米波大气温度探测仪星载系统定标中,经过校正得到的相关结果可以直接用于亮温图像的反演。