包装用纸中镉、铬、铅、汞的测定

本文介绍并讨论了包装用纸中镉、铬、铅、汞含量的测定方法.文中介绍了检验任务的来源以及试验样品合格限的要求;陈述了检验方法的仪器、试剂及具体的实验步骤;用详尽的数据说明方法的检出限、回收率及室内精密度;分析了检验方法中多个影响因素,并列举了三种微波消解仪的消解条件;讨论了在消解方法上的其它尝试.全文以充分的实验数据证明了方法的彻实可行,能完全满足欧盟指令94/62/EC的检验要求.     

一些稿件“结果与讨论”部分存在问题分析

简要地介绍了科技论文“结果与讨论”部分的作用及其相互关系，对一些文稿中“结果与讨论”部分存在的七种主要问题进行了分析。这七种问题分别是：①给出实验数据不讨论；②实验数据粗糙，令人难以信服；③数据少难以说明问题；④无限定条件，缺乏逻辑性；⑤缺乏数据或参考文献，令人生疑；⑥超出实验范围，以偏概全；⑦无中生有，令人摸不是头脑。认为要写出高水平的科技论文，必须解决这些问题。     

微波消解技术在食品分析中的应用探索

文章简要介绍了微波消解技术的基本原理和特点,消解方法、测定条件的选择,其与常规电热板消化的比较,微波消解的优点等几个方面的讨论,用微波消解和湿法消解分别测定了5个国家标准参考物质的金属元素,并进行比较,探讨微波消解技术在食品分析中应用的可行性。     

基于动态RTK稳定性与可靠性的研究

本文主要的介绍了GPS、RTK技术的原理及其方法,以及影响RTK测量的诸多因素(GPS系统、数据链、RTK系统、环境、观测方案)并对RTK数据的稳定性和准确性以及其它特性作了具体的外业实验进行了检验。通过实验,得到了关于RTK技术测量的一些结论,并对结论进行了讨论,以及对于RTK的问题提出了一些解决方法。     

高效液相色谱测定乳及乳饮料中的苯甲酸、山梨酸、安塞蜜、糖精钠

本文描述了应用高效液相色谱对乳及乳饮料中苯甲酸、山梨酸、安塞蜜、糖精钠的含量进行检测。该方法简单、安全，检验结果准确可靠，检验数据重现性好。     

微波消解—原子荧光光谱法测定鲫鱼中的总汞

阐述了用微波消解—原子荧光光谱法测定鲫鱼肉中的总汞。优化了实验条件,得到的数据准确度和精密度好。本实验检测鲫鱼肉中总汞的含量测试结果0.024mg／kg,明显低于国家标准。     

绝缘层厚度与芯线直径测量偏离方法的比对和探讨

本文探讨了GB／T2951．1—1997中绝缘层厚度与芯线直径测量装置的选择问题。通过西藏出入境检验检疫局与珠海出入境检验检疫局进行比对实验，证明只要用满足标准规定精度的测量仪器去测量，就能达到要求，并不一定要用读数显微镜，标准中方法是可以偏离的。     

利用牛顿环检验光学元件表面质量实验论证

简单阐述牛顿环干涉原理及利用牛顿环检验光学元件表面质量的原理。选取一个透镜试样,对其表面质量进行检验,根据实验现象、实验数据总结检测结果,并进行必要的讨论且给出定性分析的结果。     

微波消解-ICP-AES同时测定车用汽油中铁、锰、铅、硅

采用硝酸作为消解剂对样品进行微波消解,利用ICP-AES同时测定车用汽油中的Fe、Mn、Pb和Si元素。通过加标回收实验与方法精密度计算,验证了该方法所得数据的可靠性,各元素测定结果的相对标准偏差在1.77%-4.69%（n=6）之间,加标回收率在91.1%-108.0%之间。结果显示,与常规单一检测法相比,该法高效简便、灵敏准确。     

铁和钢中有害元素锡和铋的检测方法研究

本文介绍了钢和生铁中元素的成品检验方法。利用双道原子荧光光度计的检测条件选择和优化,建立了锡、铋元素的成品检验方法,讨论了方法的准确度与精密度、酸度选择及干扰的消除等检测关键环节。检测结果满足对钢材中锡和铋元素含量控制的要求。     

Rodents,evolution, and prehistory

The rodents, especially voles, evolved very rapidly during the Quaternary era. Their remains, particularly the teeth, were fossilised by the thousand in prehistoric deposits. The sites can be dated from the degree of evolution attained by the teeth. Since rodents are closely adapted to their biotopes and live under well defined climatic conditions, they are extremely valuable for reconstructing the landscapes and climates of prehistory. In many cases, a single rodent tooth can be used to assess the age of a human skull or a prehistoric settlement, and throw light on the environment and climate of the time.     

DNA, Inference, and Information

This paper assesses Sarkar's ([2003]) deflationary account ofgenetic information. On Sarkar's account, genes carry informationabout proteins because protein synthesis exemplifies what Sarkarcalls a ‘formal information system’. Furthermore,genes are informationally privileged over non-genetic factorsof development because only genes enter into arbitrary relationsto their products (in virtue of the alleged arbitrariness ofthe genetic code). I argue that the deflationary theory doesnot capture four essential features of the ordinary conceptof genetic information: intentionality, exclusiveness, asymmetry,and causal relevance. It is therefore further removed from whatis customarily meant by genetic information than Sarkar admits.Moreover, I argue that it is questionable whether the accountsucceeds in demonstrating that information is theoreticallyuseful in molecular genetics.

1. Introduction
2. Sarkar's InformationSystem
3. The Pre-theoretic Features of Genetic Information

   3.1Intentionality

   3.2 Exclusiveness

   3.3 Asymmetry

   3.4 Causalrelevance

4. Theoretical Usefulness
5. Conclusion

     

Geeks, meta-Geeks, and gender trouble: activism, identity, and low-power FM radio

In this paper, I consider the activities of a group of individuals who tinker with and build radio hardware in an informal setting called 'Geek Group'. They conceive of Geek Group as a radical pedagogical activity, which constitutes an aspect of activism surrounding citizen access to low-power FM radio. They are also concerned with combating the gendered nature of hardware skills, yet in spite of their efforts men tend to have more skill and familiarity with radio hardware than women. Radio tinkering has a long history as a masculine undertaking and a site of masculine identity construction. I argue that this case represents an interplay between geek, activist, and gendered identities, all of which are salient for this group, but which do not occur together without some tension.