Spartan6芯片μC/OS-Ⅱ的可抢占式嵌套中断控制方法

介绍了Spartan6芯片搭载MicroBlaze软核的硬件平台,以及集成了μC/OS-Ⅱ操作系统的软件平台;给出了在此软硬件平台上的可抢占、可嵌套的中断机制的实现方法;灵活地运用面向底层硬件代码与操作系统代码之间的参数传递,协调了中断处理与任务调度之间的关系。阐述了方案的原理,给出了程序流程图;通过试验,验证了可抢占、可嵌套的中断机制的正确性与可行性。     

Characterization of pedicel,paper, and larval silk from nest ofPolistes annularis (L.)

The pedicel, nest paper, and larval silk ofPolistes annularis nests were analyzed by high-resolution solid-state [¹³C]NMR. The pedicel was found to have a high nitrogen content (11%), and the NMR spectra indicated that it is a mixture of carbohydrate and protein. The pedicel protein has an amino acid composition that is very rich in glycine, alanine, serine, and proline (67% of identified residues), similar to that of some insect silks. Solid-state [¹³C]NMR indicated that the nest paper is composed predominantly of cellulose. Silk, spun by matureP. annularis larvae, was shown by [¹³C] NMR and amino acid analysis to be a protein very high in serine and alanine (53%), but the amino acid composition is distinct from that of the pedicel protein.     

基于NIOSⅡ的数字电子钟设计与实现

以NioslCycloneEPIC20F400C7开发板为硬件平台,利用OuartusⅡ、SOPCBuilder和NiosⅡIDE软件设计来实现一个基于SOPC的多功能数字电子钟,该电子钟系统由FPGA部分（包括Nios11CPU核、内部定时器、Avalon总线等）、存储器部分（包括SRAM、FLASH）和外围元件部分（按键、LCD显示器）三大部分构成,经过C语言编程使该电子钟具有能够在液晶屏上显示帮助信息,具有时问、日期、状态提示的功能,并可利用4个按键对时间（小时和分钟）、日期（年月日）进行设置（包括退出设置）。经测试该电子钟具有较好的时间精度。     

Preparation of highly crystalline nanofibers on Fe and Fe-Ni catalysts with a variety of graphene plane alignments

The present study confirmed that highly crystalline nanofibers with controlled structure may be prepared over Fe and Fe-Ni alloy catalysts. The degree of graphitization of various carbon nanofibers (CNFs) was analyzed by using C(0 0 2) peaks from the XRD profiles. The C(0 0 2) peaks of CNFs over Fe catalyst shifted to higher angle and became narrower as the preparation temperature increased from 560 to 620 °C. Tubular CNFs prepared at temperature higher than 630 °C showed lower 2θ angles compared to those of platelet fibers. CNFs prepared over Fe-Ni catalysts tended to resemble those prepared over Fe catalysts. The degree of graphitization of platelet CNFs resembled natural graphite, while d_0 0 2 of the tubular CNFs showed values below the 3.39 Å reported as a theoretical minimum for a cylindrical alignment. Lc_0 0 2 of platelet and tubular CNFs increased by heat treatment at 2000 and 2800 °C though d_0 0 2 changed little. A transverse section of platelet and tubular CNFs had a hexagonal shape, not a round shape. The hexagonal column allows AB stacking of hexagonal planes that can give perfect hexagonal alignment.     

一种户外多功能定位与测量装置的设计实现

本设计是针对在户外登山、旅行、勘测过程中常常既需要定位系统,又需要温度、高度、气压、湿度等参数测量系统的情况下,设计的一种多功能便携式测量工具。本系统采用STM32作为控制器,移植了μC/OS实时操作系统,驱动GPS模块和各种传感器模块,实现了数据的实时采集显示。本系统采用了0.96’OLED作为显示单元,STM32引入了低功耗模式,锂电池供电,提升了系统的便携性和低功耗。     

C语言编译密码方案的应用

随着计算机技术飞速发展,编程技术取得巨大进步,各种各样的程序为我们学习工作生活提供了很大方便,编程工具和语言类型也空前丰富。其中,C语言由于实现速度快,逻辑性强,在编程技术中占有重要地位,成为研究开发的重要工具,很多环境下非常便捷。本文从研究角度出发,以总结的方式,介绍在采用C语言编译密码方案并进行分析的过程,在应用中不断学习。     

基于AOP技术的通用线程监控平台GTMP*

提出并实现了基于AOP技术的通用线程监控平台。借助AOP的需求空间分离实现技术,使用该平台的原系统不必事先具有监控能力,该平台可以在不手动改变系统源代码的情况下通过工具自动植入系统内部,为系统注入监控功能,实现对运行线程信息的监视和对指定线程运行速度的变换,实现对整个系统运行行为的控制。     

The influence of sulphate-reducing bacteria biofilm on the corrosion of stainless steel AISI 316

This work investigates microbially-influenced corrosion (MIC) of stainless steel AISI 316 by two sulphate-reducing bacteria, Desulfovibrio desulfuricans and a local marine isolate. The biofilm and pit morphology that developed with time were analyzed using atomic force microscopy (AFM). Electrochemical impedance spectroscopy (EIS) results were interpreted with an equivalent circuit to model the physicoelectric characteristics of the electrode/biofilm/solution interface. D. desulfuricans formed one biofilm layer on the metal surface, while the marine isolate formed two layers: a biofilm layer and a ferrous sulfide deposit layer. AFM images corroborated results from the EIS modeling which showed biofilm attachment and subsequent detachment over time.     

Effects of coating thickness and residual stresses on the bond strength of ASTM C633-79 thermal spray coating test specimens

Wire-arc-sprayed nickel-aluminum is widely used in the aircraft industry for dimensional restoration of worn parts and as a bond coat for thermal barrier coatings and other top coats. Some repair applications require thick coatings, which often result in lower bond strength. A mechanism being investigated to ex-plain this decrease in bond strength is the free edge effect, which includes both coating residual stresses and coating thickness. The layer-removal method was used to determine experimentally the residual stresses in wire-arc-sprayed nickel-aluminum coatings of different thicknesses. Bond strength evalu-ations were performed using an improved ASTM C 633-79 test specimen. Finite-element analysis and fracture mechanics were used to investigate the effects of coating thickness and residual stress state on coating bond strength.