Effect of mixed solvents on PCDTBT:PC70BM based solar cells

We investigated the effect of solvents on the morphology, charge transport and device performance of poly[N-9″-hepta-decanyl-2,7-carbazole-alt-5,5-(4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiazole)] (PCDTBT) and [6,6]-phenyl C71-butyric acid methyl ester (PC₇₀BM) based solar cells. To carry out this investigation, chloroform and 1,2-dichlorobenzene were chosen as good solvents of the two compounds. Films prepared with chloroform exhibit larger domains than those prepared with 1,2-dichlorobenzene and their size increases with the amount of PC₇₀BM. Fine tuning of the domain size was realized by using a solvent of mixed chloroform and 1,2-dichlorobenzene. At a mixing ratio of 50%:50%, a power conversion efficiency of 6.1% was achieved on PCDTBT:PC₇₀BM (1:3) devices with an active area of 1 cm², under air mass 1.5 global (AM 1.5 G) irradiation at 100 mW/cm².     

A hierarchical Path Computation Element (PCE)-based k-random-paths routing algorithm in multi-domain WDM networks

We propose an inter-domain routing algorithm for multi-domain wavelength-division multiplexing (WDM) mesh networks. On the basis of the hierarchical Path Computation Element (PCE) architecture, the proposed algorithm introduces a k random path strategy in the parent PCE to adjust the algorithm optimization level. Simulation results indicate that the proposed algorithm outperforms previous schemes in terms of blocking probability and resource utilization, while preventing the increase in PCEP signaling overhead.     

On the Cutoff Wavelength of Rectangular-Shaped Microshield Line by Edge Element Method

In this paper, the cutoff characteristic of rectangular-shaped microshield transmission line has been analysed by edge element method. Dependence of cutoff wavelengths on the thickness of metallic signal strip, dielectric constant of dielectric substrate and the width of the rectangular-shaped ground conductor are presented in tabular form. Numerical results in this paper have important values in design of rectangular-shaped microshield lines in microwave and millimeter wave integrated circuits.     

西门子SINAMICS S120传动系统在轧机EGC中的应用

本文主要介绍了西门子SINAMICS S120传动系统在济钢4300m新厚板轧机电动压下控制系统中的应用。     

An energy detection receiver for non-coherent IR-UWB

A non-coherent receiver for impulse radio ultra-wide band(IR-UWB)is presented.The proposed receiver front-end consists of a high gain LNA,a high frequency detector and an intermediate frequency(IF)amplifier to amplify the recovered signal and drive an external test instrument.To meet the requirements of high gain and a low noise figure(NF)under moderate power consumption for the LNA,capacitor cross coupled(CCC)and current reuse techniques were adopted.The detector consists of a squarer and an integrator.The overall circuit consumes 41.2mA current with a supply voltage of 1.8 V at a 400 MHz pulse rate.The resulting energy efficiency is 0.19 nJ/pulse.A chip prototype is implemented in 0.18-μm CMOS.The die area is 2.1×1.4 mm~2 and the active area is 1.7×0.98 mm~2.     

Highly Intensified Surface Enhanced Raman Scattering by Using Monolayer Graphene as the Nanospacer of Metal Film–Metal Nanoparticle Coupling System

It is widely accepted that surface enhanced Raman scattering (SERS) enhancement results from a combination of electromagnetic mechanisms (EM) and chemical mechanisms (CM). Recently, the nanoparticle‐film gap (NFG) system was studied due to its strong local enhancement field. However, there are still some technical limitations in establishing effective and simple ways for reliable and precise control of sub‐nanospacer. In addition, works on designing the nanospacer in NFG system for efficient interaction with target molecules for further improving SERS signals are rather limited. Here, a novel NFG system is proposed by introducing ultrathin monolayer graphene as well‐defined sub‐nanospacer between Ag NPs and Ag film (named G(graphene)‐NFG system). The new G–NFG system offers tremendous near‐field enhancement with one of the highest enhancement ratio of 1700 reported to date. These results show that the single‐layer graphene as a sub‐nanospacer renders the proposed G–NFG system with particularly strong EM enhancement (due to multiple couplings including the NP–NP couplings and NP‐film couplings) and additional CM enhancement in detecting some π‐conjugated molecules to function as a powerful tool in analytical science and the related fields.     

基于MOPSO-NSGA2算法的测试优化选择方法

测试优化选择是测试性设计至关重要的一个步骤,主要针对测试不可靠条件下的测试优化选择问题进行了研究.首先将该问题还原为多目标问题来分析,在此基础上以测试数量、测试成本、虚警率为目标,故障检测率、隔离率为约束条件建立了问题的数学模型;然后以贝叶斯网络测试性模型为基础,利用提出的MOPSO-NSGA2算法求解该问题;最后利用所提算法对某导弹机载无线电高度表开展测试优化选择设计,并与MOPSO算法、NSGA-2算法进行对比,验证了方法的有效性与实用性.     

高可靠性P-LDMOS研究

分析了沟道高电场分布产生原因及各个参数对高电场的影响,提出了两条沟道设计的原则——拉长沟道同时降低沟道浓度.模拟结果显示,两条原则能够有效地降低沟道两端的两个峰值电场,从而缓解沟道热载流子效应,提高P-LDMOS的可靠性.     

无线光通信中RCPT/ARQ自适应 差错控制机制的研究

为了克服无线光通信中的光强闪烁、大气衰减等信道干扰,本文结合无线光信道下Turbo码迭代译码算法,分析了RCPT码的穿孔图案特性,在此基础上完整给出了无线光通信系统RCPT/ARQ自适应差错控制方案,仿真表明RCPT/ARQ自适应差错控制方案显著提高了链路的吞吐量和稳定性.同时结合无线光信道的特性,提出了RCPT/ARQ机制下的排序重发策略,进一步优化系统在恶劣信道条件下的链路吞吐量.     

CORBA技术在系统集成中的应用

随着网络技术和电子技术的发展，分布式计算和系统集成成为焦点。本文阐述了CORBA技术的特点及优势，并通过一个例子简单阐述了CORBA技术在系统集成中的应用。