Analysis of Influencing Factors on NOx emission in Gas-Fired Heating and Hot Water Combi-Boilers Based on Orthogonal Method

In order to determine the sensitivity of influencing factors on NOx emission in gas-fired heating and hot water eombi-boilers,the orthogonal method was adopted ...     

Electrical and mechanical properties of novel polyaniline coated polycaprolactam fibers

Polycaprolactam (PA6) fibers were coated with polyaniline (PANI) by a novel dissolving-coating method. In the dissolving-coating method, dissolution of PA6 fiber surface is the necessary condition for imparting conductivity to PA6 fiber. But the dissolution of fiber surface would cause the structural integrity of PA6 fiber being destroyed. In this research, the effect of solvent concentration and roller speed on the mechanical and electrical properties of PANI-coated PA6 fiber were discussed. The results showed that the optimum condition for PANI-coated PA6 fiber is 75% formic acid aqueous solution and 100 rpm. The coating durability of PANI was tested by TG, FT-IR, water washing and heating to different temperatures. The experimental data indicate that PANI coating is difficult to peel off after the heating and washing treatment.     

PROFIBUS-DP智能从站研究

该文主要讨论了一种采用单片机与Siemens的从站协议芯片SPC3开发智能从站的方法。开发的从站性能可靠,成本低廉,具有一定经济价值。讨论了硬件配置以及软件体系结构。为了实现PROFIBUS站点间的完全通信保证系统的稳定可靠,采用PROFIBUS通信协议芯片SPC3实现DP从站设计。     

嵌入式Web Server及其在工控系统中的应用

针对传统Web技术路线方案用于构造工控系统Web Server存在的困难,提出应用嵌入式技术开发工控系统中嵌入式Web Server的基本思想.文章介绍了嵌入式Web Server的功能,给出了B/S结构的瘦Web Server体系结构,阐述了嵌入式Web Server实现的一些关键技术.工控系统基于嵌入式Web Server的远程控制方式将有效降低监控运行维护成本、提高监控运行维护效率,因而具有很大的应用前景和推广价值.     

Structural and optical properties of (Al,K)-co-doped ZnO thin films deposited by a sol–gel technique

Thin films of Al-doped ZnO (AZO) and (Al, K)-co-doped ZnO (AKZO) were synthesized by sol–gel spin coating and their structural and optical properties were investigated. All the films had a preferential orientation in which the c-axis was perpendicular to the substrate. The optical bandgap increased after Al doping, but decreased after K doping at a given Al doping concentration. UV emission and a broad visible emission band were observed in photoluminescence (PL) spectra. The intensity of both emission bands decreased after Al and K co-doping. PL excitation (PLE) spectra of the blue emission band indicate that the initial state is possibly the same for all the samples and a similar case occurs for the orange–red emission band. The green emission can be attributed to electronic transitions involving oxygen vacancies. A possible process for the orange–red emission of the thin films is radiative recombination of an electron trapped in a zinc interstitial defect with a hole deeply trapped in interstitial oxygen.     

Increase in thermoelectric power factor of carbon-nanotube films after addition of polystyrene

We report the enhancement of the thermoelectric power factors of single-walled carbon-nanotube (SWCNT) films caused by the addition of polystyrene to the films as a binder. The Seebeck coefficient of the SWCNT films was increased by addition of polystyrene. On the other hand, the electrical conductivity gradually decreased with increasing amount of polystyrene. The power factor was maximum for a polystyrene concentration of 20 wt%; it was approximately 1.7 times higher than that of a pure SWCNT film. These results indicate that polystyrene is a superior binder polymer for synthesizing CNT/polymer thermoelectric composites.     

Organic light-emitting diodes fabricated on recessed anodes for light extraction enhancement

Circular recesses have been fabricated on indium tin oxide (ITO) anodes to enhance light extraction of organic light-emitting diodes (OLEDs). The effects of recess depth and recess coverage ratio on the performance of a green OLED were systematically investigated. Results showed that the current efficiency could be enhanced from 40.7 cd/A of a planar device to 47.2 cd/A of the device with a recess depth of 100 nm and a recess coverage ratio of 14.1%. The enhanced light extraction by the recess wall effect was realized to be the major factor leading to the improved efficiency. The efficiency is however limited by the accompanying increase in electrical resistivity of the ITO films at deep recesses and high recess coverage ratios. Despite of the insignificant efficiency enhancement (up to 16%) in this study, this recessed ITO approach provides a simple architecture to enhance waveguide mode light extraction without adding an internal medium.     

Noisy speech emotion recognition using sample reconstruction and multiple-kernel learning

Speech emotion recognition (SER) in noisy environment is a vital issue in artificial intelligence (AI). In this paper, the reconstruction of speech samples removes the added noise. Acoustic features extracted from the reconstructed samples are selected to build an optimal feature subset with better emotional recognizability. A multiple-kernel (MK) support vector machine (SVM) classifier solved by semi-definite programming (SDP) is adopted in SER procedure. The proposed method in this paper is demonstrated on Berlin Database of Emotional Speech. Recognition accuracies of the original, noisy, and reconstructed samples classified by both single-kernel (SK) and MK classifiers are compared and analyzed. The experimental results show that the proposed method is effective and robust when noise exists.     

VCO电调特性的线性校正技术综述

VCO电调特性的线性校正技术是决定线性调频连续波雷达系统性能的关键技术之一。给出了VCO电调线性度的基本定义。VCO电调特性的线性校正技术主要包括电抗补偿线性校正、开环线性校正和闭环线性校正三种基本校正方案。详细分析了各种校正方案的基本原理,并对各种校正方案的优缺点进行了对比分析;同时,详细介绍了VCO线性校正技术的最新研究进展。     

利用“时码法”对小型数字录像带进行检验鉴定的流程和注意事项

本文主要阐述利用“时码法”对小型数字录像带的内容进行检验鉴定的适用范围,流程及所需设备,同时说明在检验过程中的注意事项