串行EEPROM在单片机系统中的应用

该文介绍了常用的24Cxx系列串行EEPROM在MCS-51单片机系统中的应用编程方法,包含了I2C总线基本概念、24Cxx系列串行EEPROM的操作方法,内容精练实用,作为职业院校单片机应用教学内容的补充,对于激发学生的学习兴趣、拓展思维、贴近市场需求具有一定的实用意义。     

An ultra-sensitive non-enzymatic hydrogen peroxide sensor based on SiO2-APTES supported Au nanoparticles modified glassy carbon electrode

A novel electrochemical sensor based on (3-aminopropyl)triethoxysilane (APTES) functionalized SiO₂ supported Au nanoparticles and Nafion (Nf) as the protective membrane was fabricated for the electrochemical determination of H₂O₂ in contact lens-cleaning solution. The modification steps of glassy carbon working electrode (GCE) were evaluated by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). The amperometric results showed that Nf/[email protected]₂-APTES/GCE sensor can be used to determine H₂O₂ in contact lens solutions with the linear ranges of 14–180 μM and 0.18–7.15 mM, excellent sensitivities of 2514.6 and 894.2 μA mM cm^?2, and a low limit of detection (LOD) of 4.25 μM depending upon signal-to-noise ratio of 3. Nf/[email protected]₂-APTES/GCE exhibited excellent repeatability with relative standard deviation (RDS) of 2.66% and acceptable reproducibility with RSD of 3.35%. The sensor displayed reasonable selectivity in the presence of uric acid, dopamine, ascorbic acid, glucose, mannose, glycine, fructose, histidine, and arginine with RSD less than 2.5%. The fabricated Nf/[email protected]₂-APTES/GCE sensor has been successfully applied to detect H₂O₂ in contact lens cleaning solutions.     

摩擦焊接碳钢（EN24）和镍基高温合金（IN718）的显微组织和力学性能

Continuous-drive rotary friction welding was performed to join cylindrical specimens of carbon steel (EN24) and nickel-based superalloy (IN718), and the microstructures of three distinct weld zones—the weld interface (WI)/thermo-mechanically affected zone (TMAZ), the heat-affected zone (HAZ), and the base metal—were examined. The joint was observed to be free of defects but featured uneven flash formation. Electron backscatter diffraction (EBSD) analysis showed substantial changes in high-angle grain boundaries, low-angle grain boundaries, and twin boundaries in the TMAZ and HAZ. Moreover, significant refinement in grain size (2–5 μm) was observed at the WI/TMAZ with reference to the base metal. The possible causes of these are discussed. The microhardness profile across the welded joint shows variation in hardness. The changes in hardness are ascribed to grain refinement, phase transformation, and the dissolution of strengthening precipitates. The tensile test results reveal that a joint efficiency of 100% can be achieved using this method.     

乌洛托品硝解制备黑索金过程中热安全的实验研究

利用绝热加速度量热仪的恒温老化模式对反应过程的硝解液进行热行为研究。通过恒温放置实验,发现分解过程主要是副产物分解,主产物RDX并未分解。当起始放置时间为22℃时,绝热温升(?Tad)为596.824℃; 25℃时,?Tad为566.213℃; 30℃时,?Tad为570.610℃。反应硝解液达到最大热分解速率用时24小时所对应的温度TD24=85.4℃。通过冷却失效情形法,可以确定其危险分级为4级危险情形。     

基于ARM的RFID公交自动报站系统研究

目前,城际交通的公交系统的报站都是基于人工操作,容易出现漏报、误报或者误操作的情况,给人们的出行造成诸多不便.文章采用NXP的LPCXpresso-CN硬件平台,利用点阵式LED显示方式,并且外扩一些外设扩充系统的复杂度.整个系统成本低、开发周期短、功耗低、方便安装、实时性好,能够给人们的交通出行带来方便.     

The features of microcontroller EM78P447 and technique of port connection with I2C series bus

By describing the technique of port connection and flow chart ofR/W operation between 24LC01, serial E²PROM, and EM78P447A, features of EM78P447 and its connection with I²C serial bus are introduced. In the end, the programe of writing operation is given. Foundations item: Research on Electromagnetic Scatter Character of very Complicate Object (69571021) Biography: Huang Ji-wu(1939-), male, Associate professor, research direction: control with microcomputer and intelligent system.     

小狼毒中的两个三萜化合物

报道从小狼毒植物根部分离出两个新三萜化合物，分别命名为Ｅｕｐｈｏｒｂｉｎ Ａ和ＥｕｐｈｏｒｂｉｎＢ，经’Ｈ ＮＭＲ，＾１３Ｃ ＮＭＲ，ＩＲ和ＭＳ光谱鉴定，它们的结构分别是２３－亚甲基－羊毛甾－５（６）－烯醇和２３－亚甲基－２４－去甲基－羊毛甾－８（８）－烯醇。     

智能便携心律失常监护仪的研制

本文介绍一种用ＭＣＳ—５１单片机控制的，可在人体运动时实时检测及能自动诊断心律失常的仪器。     

Makisterone A and 24-methylenecholesterol from the ovaries of the honey bee,Apis mellifera L

Summary Makisterone A, a 28-carbon ecdysteroid (molting hormone) has been isolated from the ovaries of queen bees. Analysis by reversed-phase and silica high performance liquid chromatography (HPLC) in conjunction with a radioimmune assay (RIA) revealed about 11 ng of makisterone A present per gram of ovaries on a fresh weight basis. No C₂₇ ecdysteroids were detected. The predominant neutral sterol present was 24-methylenecholesterol.     

白介素24融合蛋白的表达、纯化和促伤口愈合功能的鉴定

本研究通过优化小鼠白介素24(mIL-24)基因序列,构建以Fc-tag为标签的mIL-24-Fc融合蛋白.对CHO进行MTX分级加压筛选,获得了稳定、高表达mIL-24-Fc蛋白的阳性克隆,同时优化了CHO细胞无血清驯化与稳定表达蛋白体系.经protein A亲和层析纯化mIL-24-Fc蛋白并利用AP binding实验检测生物学活性后,小鼠皮内注射mIL-24-Fc蛋白和伤口愈合实验证明:注射mIL-24-Fc蛋白后,小鼠表皮产生2~3层细胞增生,伤口愈合速度加快.