竖向增强体复合地基检验方法的探讨

通过对复合地基设计原理的介绍,归纳总结了振冲碎石桩、水泥土搅拌桩、灰土挤密桩等竖向增强体检测方法,同时对竣工验收相关技术参数进行了说明,为今后进一步研究竖向增强体复合地基检验方法提供了参考。     

广西藤县钛白副产硫酸亚铁综合利用研究

遵循清洁生产和循环经济的理念,对藤县钛白副产硫酸亚铁的综合利用进行了研究,通过实验确定了用硫酸亚铁混凝沉淀处理松脂加工废水的最佳条件,并指出处理后松脂加工废水的CODCr和SS浓度分别降到了585 mg/L和87 mg/L,去除率分别为79.46%和70.51%,CODCr基本达到了排入城镇污水管网的要求,可以实现以废治废,能产生较好的经济效益和环境效益。     

谈港口外包工程的安全管理

针对港口外包工程安全管理上存在的安全管理程度低、作业人员安全理念与技能低、安全投入少等主要问题进行了分析,提出了加强港口外包工程安全管理的主要措施,以实现工程的安全生产。     

基于虚拟仪器技术的音频扫频信号测量仪

针对目前音频扫频信号的测量的局限性,利用NI公司的PXI-5124数据采集卡,在LabVIEW2012开发环境下,开发了基于虚拟仪器技术的音频扫频信号测量仪,实现了音频扫频信号的直接测量。介绍了开发过程,并给出了基本程序,通过系统测试证实该仪器功能正常,测量结果准确,为音频扫频信号发生器的计量校准提供了新思路。     

加拿大《改进的食品检验模式草案》之解读与分析

加拿大食品检验局（CFIA）拟建立一套适用于所有进口或国产食品的单一和一致的检验模式。本文详述了法规草案的要旨,深入地分析了内容,提出我国探讨和关注的问题以及应对建议。     

我国外来入侵种福寿螺分子生物学研究进展

福寿螺是一类恶性外来入侵生物,自20世纪80年代初引种并入侵我国以来,对我国农作物生产和水生生态系统造成了严重的危害.我国已报道的福寿螺入侵种类包括Pomacea canaliculata和P.insularum两种,这两种福寿螺也是东南亚、南亚和北美等多国的入侵种类.这两种福寿螺近年来在世界范围内得到了广泛的研究,现综述这两种福寿螺分子生物学的研究进展,包括种类的分子鉴定、分子系统学及蛋白基因的研究等,并对其分子生物学研究和应用进行了讨论和展望.     

Kinetic Migration of Chemical Elements from Ceramic Packaging into Simulated Foods and Mature Vinegar

This study developed a method for simultaneous determination of 19 chemical elements (Al, V, Cr, Mn, Co, Cu, Ga, As, Rb, Y, Zr, Cd, Te, Ce, Pr, Nd, Sm, Er and Pb) in simulated foods [4%, 6% and 8% (w/v) aqueous acetic acid] by microwave‐assisted digestion and inductively coupled plasma mass spectrometry. We examined the migration of these chemical elements from ceramic packaging into the simulated foods and into two types of mature vinegar. The simulated foods showed matrix effects, compared with stock solution solvents (5% ultra‐pure nitric acid). The migration of chemical elements from ceramic packaging into simulated foods was affected by migration time, temperature and acidity of the simulated food. The chemical elements showed different migration behaviours in black and white mature vinegar, and the amount of migration also varied depending on the inner surface of the ceramic packaging. Copyright © 2012 John Wiley & Sons, Ltd.     

Characterization of negative temperature coefficient of resistivity in (Sn1−x Ti x )0.95Sb0.05O2 (x ≤ 0.1) ceramics

Sb-doped SnO₂-based ceramics substituted by a trace of titanium, (Sn_1?x Ti _x )_0.95Sb_0.05O₂ (x ≤ 0.1), were prepared through a wet chemical process polymerized with polyvinyl alcohol. The phase component and related electrical properties of the ceramics were investigated. The results show that all the ceramics have the tetragonal rutile-type SnO₂ crystalline lattice and show typical effect of negative temperature coefficient (NTC) of resistivity. The room-temperature resistivities and NTC material constants can be adjusted widely by changing the Ti content in the ceramics. The investigations by analyzing the electrochemical impedance spectra at various temperatures show that both grain effect and grain-boundary effect contribute to the NTC feature of the ceramics. The conduction mechanisms combining the electron-hopping model and band conduction are proposed for the NTC effect in the ceramics.     

硝酸银电位滴定法测定外加剂中氯离子含量的不确定评定

依据JJF 1059-1999测量不确定度评定与表示,从试剂纯度、摩尔质量、电子天平称量、容量瓶、滴定管、移液管、酸度计、重复性测试等影响因素引入的不确定度分量,对以硝酸银溶液用电位滴定法测定外加剂中氯离子含量进行不确定度评估。分析了测定过程中不确定度来源,量化不确定度分量,求出了合成不确定度和扩展不确定度,给出了测定结果的表示式为(5.43±0.30)%,k=2。     

提高质检机构量值溯源管理质量的思考

通过对测量设备、标准物质量值溯源管理过程进行系统的梳理,抓住管理重点,对易发问题和难点问题进行分析,提出在管理过程中要动态地发现存在的共性的和个性化的问题,采取有效措施,针对原因持续地改进,从源头上有效消除质量偏离,使测量设备、标准物质能一直保持应有的技术性能和测量准确度,为质检机构高质量地完成检验任务提供基础性支持。