QNX消息传递及其在线程间通信的应用

本文介绍了QNX嵌入式实时多任务操作系统的消息传递和微内核体系结构的特点．创建线程的方法，消息传递的基本原理．以及阻塞式消息传递在线程间通信的实现方法．并给出了实例代码。     

QNX环境下多线程编程

介绍了QNX实时操作系统和多线程编程技术，包括线程间同步的方法、多线程程序的分析步骤、线程基本程序结构以及实用编译方法。     

Influence of hydrogen content on the behavior of grain reflnement in hypereutectic aluminum-silicon alloy

Dissolved hydrogen is harmful to mechanical properties of refined hypereutectic aluminum-silicon alloys. In the present work, by using a stepped-form mold and the hydrogen-detecting instrument HYSCANⅡ, the relationship between the initial hydrogen content in the melt and the refinement effect on the casting of hypereutectic aluminum-silicon alloy was investigated. The experimental results show that the cooling rate, the hydrogen content and the grain refinement effect are three interactive factors. When the hydrogen content is above 0.20 mL/100 g and the cooling rate is lower than that in 50 mm-thick step, hydrogen dissolved in the alloy melt influences the grain refinement effect. With increasing the cooling rate, the critical hydrogen content increases too. It is expected that much hydrogen in the melt make the net interfacial energy larger than or equal to zero, resulting in the shielding of the particles A1P during solidification and that the critical gas content is closely related to the critical     

集装箱吊具有阻尼AMD防摇装置的试验研究

为了检验集装箱吊具有阻尼AM D防摇装置的控制效果,设计了一套基于主动质量阻尼（AM D）控制原理的电子主动防摇试验装置。进行了AM D防摇控制理论分析,应用M atlab/S im u link软件建模仿真,并做了相应的防摇模拟试验。对比理论仿真和试验数据给出了阻尼对试验装置防摇效果的影响。     

基于ICC标准的彩色扫描仪色彩检测及标定

对彩色扫描仪的 ICC Profile文件结构进行了详细的分析 ,给出了建立扫描仪 ICC Profile文件的矩阵模型和查表模型 ,提出了使用 IT8.7/ 2色靶、最小二乘回归法和多项式的方法求解模型中的系数的方法。最后给出了实验结果 ,表明建立的ICC Profile文件能够满足实际的需要     

绿色科技在国内公共建筑中的应用

通过研究国内当前基于绿色视角的建筑设计实践，分析绿色建设的策略，从不同角度的案例来总结绿色建筑设计思想与策略，解析国内绿色建筑的建设方向与趋势，进一步深化对绿色建筑的认识。     

Simultaneous degradation of RhB and reduction of Cr(VI) by MIL-53(Fe)/Polyaniline (PANI) with the mediation of organic acid

MIL-53(Fe)/polyaniline (PANI) composite was prepared by in situ depositing PANI on the surface of MIL-53(Fe) and their catalytic performances on the simultaneous removal of RhB and Cr(VI) were investigated. The elimination efficiency of both RhB and Cr(VI) reached more than 98% under pH=2 where hydrochloric acid and citric acid were used to adjust the pH. The results indicated that MIL-53(Fe)/PANI revealed an obvious pH response to the degradation of RhB, while citric acid promoted the Cr(VI) photoreduction. UV-Vis spectra, EIS, and photocurrent response experiments showed that MIL-53(Fe)/PANI had a better light response and carrier migration ability than MIL-53(Fe). The transient absorption spectra also exhibited that the lifetimes of photo-generated carriers were prolonged after the conductive polymer deposition on the MIL-53(Fe) surface. Scavenger experiments demonstrated that the main active species were ·O₂^- and OH. Combined with activity evaluation results, and the possible photocatalytic mechanism of MIL-53(Fe)/PANI on RhB oxidation and Cr(VI) reduction was proposed. The addition of conductive polymer can effectively improve the light response of the catalyst under acidic conditions, and meanwhile citric acid also provided a new mediation for the synergistic degradation of multiple pollutants. Good activity and stability of the catalysts made the scale-up purification of acid water feasible under UV-Vis light.     

FTIR analysis of UV aging on bitumen and its fractions

The ultraviolet (UV) aging of bitumen involves a series of complex chemical reactions due to its complicated chemistry and structure. To conduct the UV aging on simplified components of bitumen is very helpful to reveal the UV aging mechanism accurately. In this study, two bitumens were separated into four generic fractions (saturates, aromatics, resins and asphaltenes) respectively by solubility procedures and chromatographic techniques. Both bitumens and their fractions were processed to form a thin film and then aged under UV irradiation for a certain time. The Fourier transform infrared spectra of bitumens and their fractions before and after the UV aging were recorded and quantitatively analyzed based on four structural indexes to evaluate the effect of UV aging on chemical evolution of bitumens and fractions. The results show that the bitumens and their generic fractions all suffer from reactions of oxidation and aromatization during the UV aging. The single fraction separated from the bitumen suffers from more severe oxidation and is more vulnerable to the UV aging than the bitumen itself. Among the four generic fractions, saturates are the most unstable components to be oxidized by the UV aging.