基于声表面波形状记忆合金微阀研究

研制了一种声表面波控制的形状记忆合金微阀。在128°YX-LiNbO3基片上光刻叉指换能器,其激发的声表面波加热压电基片上石蜡油,使弯曲的形状记忆合金线伸展,促使与其连接的聚二甲基硅氧烷微通道壁发生形变,截止微通道,实现微阀从开态向关态转变。撤除电信号,形状记忆合金线温度下降,恢复软性,在硬质塑料薄片的恢复力作用下,微阀重新由关态转为开态。以流体输运为实验对象进行微阀开关实验,结果表明,声表面波可有效控制形状记忆合金微阀的开关操作,在28.5dBm电信号功率作用下,微阀关闭时间为40.4s。     

A comprehensive review on poly(3-alkylthiophene)-based crystalline structures,protocols and electronic applications

Poly (3-alkylthiophenes) (P3ATs) particularly poly (3-hexylthiophene) (P3HT) have vigorous tendency to crystallize into the ordered morphologies, thereby reflect the efficient electrical and optical characteristics. Here, the remarkable crystalline structures of P3ATs comprising single crystals, nanofibers, nano/microwires, nanoribbons, micelles, nanowhiskers, thin films, spherulites, etc. are thoroughly reviewed. In each category, the principle aspects like preparation methodologies (e.g., self-seeding, shearing, electrospinning, self-organization, epitaxial solidification, etc.), micro/nanostructures, orientation and optical properties are meticulously brought into consideration. Applications of the ordered P3AT structures in solar cells, organic field-effect transistors, and sensors as well as the theoretical studies are also highlighted. Furthermore, the polymorphism, sol-gel, nanoparticles, liquid crystalline morphology, and two-dimensional sheets are reviewed.     

Two-dimensional-growth small molecular hole-transporting layer by ultrasonic spray coating for organic light-emitting devices

Two-dimensional-growth small molecular organic thin film with high quality is fabricated by ultrasonic spray coating technology (USC) from the toluene solution of 4,4′,4″-tris (carbazol-9-yl) triphenylamine (TCTA). In comparison to the vacuum thermal evaporation (VTE) TCTA film, the USC-TCTA film obtained from liquid-phase solution possesses more uniform surface topography. The differences between the USC-TCTA and the VTE-TCTA in optical property, electrical property and formation mechanism are also studied in detail. Besides, to evaluate the hole transport and electron blocking ability of USC-TCTA film, the organic light-emitting devices (OLEDs) employing USC-TCTA film as hole transport layer are fabricated successfully. Additionally, the green OLEDs based on USC-TCTA film perform as well as the ones with VTE-TCTA film in current density, luminance, efficiency and color stability, and show even better tolerance to high bias voltage.     

An Adaptive Time Delay Estimator Based on ETDE Algorithm with Noisy Measurements

We address the problem of adaptive time delay estimation with noisy measurements. We develop a computationally efficient adaptive time delay estimator based on Explicit time delay estimation (ETDE) algorithm, by applying the unbiased impulse response estimation ap-proach. In this algorithm, a weighted error function is de-rived, and the time delay is explicitly parameterized in the filter coefficients and iteratively updated directly by uti-lizing the modified error function. Simulations validate the performance of the proposed algorithm for colored input and low signal-to-noise ratio scenarios.     

Generalized OSTBC‐based subcarrier intensity‐modulated MIMO optical wireless communication system

In this paper, we analyze an optical wireless communication (OWC) system having a source and a destination node, equipped with multiple transmit and receive apertures, respectively. We utilize generalized orthogonal space‐time block codes (OSTBCs) of any arbitrary order and subcarrier intensity modulation scheme for data transmission over gamma–gamma (GG) fading optical links using M ‐ary phase‐shift keying (PSK) constellation. A symbol‐wise decoding is utilized, and the closed‐form expression of the approximate average symbol error rate (SER) of multi‐aperture‐based OWC system is obtained for the generalized OSTBC and an arbitrary M ‐PSK constellation. Using the derived SER expression, we analytically evaluate the diversity order and the coding gain of the OWC system with GG atmospheric turbulence. It has been shown by the numerical results that the maximum possible diversity is achieved by using the symbol‐wise maximum likelihood decoding in the destination. Copyright © 2016 John Wiley & Sons, Ltd.     

Analysis of the dynamical behavior for enzyme-catalyzed reactions with impulsive input

Previous work has concentrated on the nature and validity of this reactions. In the paper, the dynamical behavior of Michaelis–Menten type kinetics for enzyme-catalyzed biochemical reactions is studied. Under the practical background, we investigate the effects of impulsive substrate-input.      

一种土壤剖面CO2气体通量的测试方法

设计和研制了一套土壤剖面CO2气体通量原位测试的方法和装置,该方法和装置可用于土壤剖面不同深度（0～200 cm）土壤CO2气体通量的观测、不同深度土壤层CO2气体存储量的估测、土地利用/土地覆盖变化引起土壤CO2气体释放量变化的测算和估计,以及植被或地力恢复速率的评价等。     

Photoluminescence and Electroluminescence of Organic Light Emitting Diodes Based on Tris‐(8‐quinolinolato) Aluminum Nanoparticles

利用共沉淀方法制备出平均粒径为20nm的有机物8-羟基喹啉铝纳米粒子,8-羟基喹啉铝纳米粒子呈球形且粒度不随老化时间的增加而改变。本文研究了8-羟基喹啉铝纳米粒子的光致发光及基于8-羟基喹啉铝纳米粒子制作的电致发光器件的电致发光特性。8-羟基喹啉铝形成纳米粒子后,其光致发光及电致发光发射光谱的谱峰均出现蓝移。随着驱动电压的增加,器件中8-羟基喹啉铝纳米粒子的发射峰逐渐红移。在驱动电压为16伏时,8-羟基喹啉铝纳米粒子器件的最大亮度达600cd/m²,电流密度为150mA/cm^-2时,器件的发光效率为0.19cd/A。基于8-羟基喹啉铝纳米粒子器件的发射光谱证实了AlQ₃纳米粒子具有量子尺寸效应的存在,这为有机纳米电致发光器件的研究开辟了一条新的研究路线,同时也为那些传统的有机材料如有机分子晶体的基础研究探索出新的研究方向。     

On realistic terrains

We study worst-case complexities of visibility and distance structures on terrains under realistic assumptions on edge length ratios and the angles of the triangles, and a more general low-density assumption. We show that the visibility map of a point for a realistic terrain with n triangles has complexity . We also prove that the shortest path between two points p and q on a realistic terrain passes through triangles, and that the bisector of p and q has complexity . We use these results to show that the shortest path map for any point on a realistic terrain has complexity , and that the Voronoi diagram for any set of m points on a realistic terrain has complexity and . Our results immediately imply more efficient algorithms for computing the various structures on realistic terrains.     

DX-100中波发射机备份模拟输入电路板的调试与维护

一套调试完好的备份电路板对于迅速查找和处理发射机故障,确保台站安全播出具有非常重要的帮助作用.根据多年来维护DX-100中波发射机的实践经验,总结出DX-100中波发射机模拟输入电路板进行备份调试的方法和步骤,供各台技术维护人员参考.