ICP-AES测定铜冶炼烟灰中铂和钯的含量

针对铜冶炼烟灰中铂和钯含量的检测对于回收烟灰中的贵重金属具有关键作用。当前在实际操作过程中多采用电感耦合等离子体发射光谱法,这种方法具有多种优点,准确度高、精密度高、检出限低,测定速度较快,线性范围较宽,而且还可以同时检测多种元素。文章采用电感耦合等离子体发射光谱法测定铜冶炼烟灰中的铂和钯的含量,铂的相对标准偏差为3.26%～3.79%,钯的相对标准偏差为1.86%～2.19%。检测结果显示,铂和钯加标回收率达到96%～102%。     

采用电感耦合等离子体发射光谱法分析空气和废气的探讨

本文通过检验电感耦合等离子体发射光谱测定空气和废气中砷、铍、镉、铬、锰、镍、铅的准确度、精密度以及检出限,以确认《空气和废气颗粒物中金属元素的测定电感耦合等离子体发射光谱法》(HJ 777-2015)用于实际分析的可行性。     

电感耦合等离子体发射光谱的新进展分析

电感耦合等离子体发射光谱法( ICP- AES)被广泛使其广泛应用于地质矿产分析测试中,是目前稀土元素( REES)的主要分析测试手段,ICP- AES具有动态线性范围宽、多元素同时测定等优点,同时具有优越的分析特性。我国以电感耦合等离子体发射光谱法为主体建立了一些标准的数据分析方法,如GB/T 17417.1-17417.2-2010等。本文从测定稀土在矿石中不同赋存形态的角度出发,对我国电感耦合等离子体发射光谱法进行了新进展分析。     

采用ICP-OES测区域地球化学样品中的铜铅锌钴镍

文章介绍了采用盐酸-硝酸-氢氟酸-高氯酸的四酸体系对区域地球化学样品进行样品前处理,用盐酸复溶提取,制成10%的盐酸介质溶液,经电感耦合等离子体发射光谱法测定样品中铜铅锌钴镍的方法。方法的最低检出限、精密度、准确度均能满足DZ/T 0011—2015 《区域地球化学普查规范(1:50000)》中对地球化学普查样品元素分析的要求。同时也是对国产电感耦合等离子体发射光谱仪检测能力的验证。     

ICP-AES法测定铝锰铁合金中杂质元素

采用电感耦合等离子体原子发射光谱法(ICP-AES)测定了铝锰铁中杂质元素。采用酸溶解试样,溶解后,用ICP-AES测定磷等元素,铝锰铁中磷检出限为0.02μg/mL,采用基体匹配与背景扣除法消除基体对待测元素的光谱干扰,确定了最佳实验条件。方法已成功地应用于铝锰铁中杂质元素的测定,试验证明,本方法简便、快速、准确,分析结果满意     

食品中铜含量测定方法的研究进展

铜元素在食品中广泛存在,是人体不可或缺的微量元素,如果缺乏铜会对人体造成很大的危害,导致神经系统失调,大脑功能发生障碍。本文综述了分光光度法、原子吸收光谱法、电感耦合等离子体发射光谱法等测定铜含量的方法。     

电感耦合等离子体光谱法测定镍基合金中的硅、锰、铬、铁、钼、铌

通过对各分析元素分析谱线的选择和仪器测量条件的确定,建立了电感耦合等离子体光谱法测定镍基合金中硅、锰、铬、铁、钼、铌合金元素的方法。结果表明,各元素线性相关系数均>0.995,相对标准偏差均<1.0%之间(n=10),各元素加标回收率在97.45%～102.68%。该方法具有良好的精密度和准确度,线性关系良好,能够满足日常分析中对镍基合金中硅、锰、铬、铁、钼、铌元素含量测定的需要。     

电感耦合等离子体原子发射光谱法测定铸铁、生铁中的硅

建立了电感耦合等离子体法测定铸铁、生铁等中硅的方法.样品经王水溶解后,用电感耦合等离子体质谱仪测定其中的硅含量.该法检出限为0.0255 μg/mL,测量范围为0.0055％-3.708.     

ICP-OES在火试金重量法分析铜精矿中金、银的研究和应用

建立了火试金法富集-电感耦合等离子体发射光谱法测定铜精矿金银合粒中的杂质元素的分析方法。通过试验测试得知所有金银合粒中均含有少量的铅、铋、钙,少数样品中含有少量的铂、钯,在选定仪器最佳状态的条件下,其相对标准偏差(n=8)铅、铋、钙、铂、钯为3.58%、2.69%、5.25%、4.78%、4.16%,加标回收率均在95～105%,能满足分析方法测定要求。     

ICP-MS同时测定生活饮用水地表水源地水质15种金属项目

采用电感耦合等离子体质谱仪(ICP-MS)同时测定生活饮用水地表水源地水质铜、锌、镉、铅、铁、锰、钼、钴、铍、锑、镍、钡、钒、钛、铊15种金属元素的含量。充分预热仪器后,用质谱调谐液调整仪器指标使其达到良好测定状态,选取Li6、Sc、Ge、Rh、In、Bi作为内标。各测定元素相关系数均在0.999以上,检出限在0.01～0.73μg/L之间,样品全程序空白和实验室空白均低于检出限,有证标准物质测定结果均在标准要求的范围内,实际样品加标回收率72.0%～118%,平行样品相对偏差<20%。结果表明,该方法简便、快速、适用于饮用水源地水质多种重金属元素同时测定。     

Comparing FTTH access networks based on P2P and PMP fibre topologies

There is an ongoing discussion in the market which Next Generation Access (NGA) architecture best suits future needs and which investment and cost differences exist. The discussion can be subsumed as P2P vs. GPON, which is somewhat misleading as this article reveals. The discussion is driven by the fact that the high capital cost and the long asset life time of fibre mean that the technology choices made today will dominate the opportunities for telecommunication business of all market players, incumbents, competitors, content providers and business and residential users for many years in the future.The paper analyzes the cost and other differences between Fibre-to-the-Home (FTTH) access network architectures and their related different wholesale approaches by using the well-known and understood steady state approach applied in other NGA analyses in the past. In addition to the steady state analysis a dynamic cost evaluation is included taking into account the different investment behaviour of the FTTH architectures over time. The results describe investment and cost differences between architectures, incumbents and wholesale based competitive operators. The analysis has been performed for different geotypes (clusters) of decreasing population density in a representative European settlement structure.     

Indigenous peoples’ nutrition transition in a right to food perspective

In indigenous communities the nutrition transition characterized by a rapid westernization of diet and lifestyle is associated with rising prevalence of chronic disease. Field work and literature reviews from two different policy environments, Argentina (Jujuy) and Canada (Nunavut), identified factors that add to indigenous peoples’ disease risk. The analytical framework was the emerging human right to adequate food approach to policies and programmes. Indigenous peoples’ chronic disease risk tends to increase as a result of government policies that infringe on indigenous peoples’ livelihoods and territories, undermining their economic system, values and solidarity networks. Policies intended to increase food security, including food aid, may also fuel the nutrition transition. There is a need to explore further the connection between well-intended policies towards indigenous peoples and the development of chronic diseases, and to broaden the understanding of the role that different forms of discrimination play in the westernization of their lifestyles, values and food habits. Food policies that take due account of indigenous peoples’ human rights, including their right to enjoy their culture, may counteract the growth of chronic disease in these communities.     

A strategic skill based model of supplier integration and its effect on supply management performance

Supplier integration is a tool to help organizations gain competitive advantage. Strategic supply management skills and the supply management function's perceived status are hypothesized as antecedents to supplier integration leading to supply management performance. The sample for this study includes 152 executive level supply management professionals. The empirical results suggest that strategic skills and perceived status are essential antecedents to supplier integration and subsequent performance. Further, the relationship between strategic skills and performance is mediated by supplier integration. Results of a dominance analysis also suggest which strategic skills are most likely to explain status integration, and performance. These findings have significant implications for supply management theory and practice.     

面向对象的程序设计

用Ｃ＋ ＋ 语言阐述面向对象程序设计中封装和继承的概念以及在实际中怎样运用这些概念提高程序设计水平。     

Cost allocation of WCDMA and wholesale pricing for mVoIP and data services

This study estimates cost-based prices for wholesale voice and data services provided to 3G (WCDMA) MVNOs according to their distinct types. For estimation, 3G MVNOs are classified into different types, and the overall cost of WCDMA facilities are separated into voice and data components based on their subscriber rates, actual traffic rates, as well as efficiency consideration of traffic rates. The study then calculates cost-based wholesale prices of voice and data services for each of the 3G MVNO types. The result of this study shows that a cost-plus pricing scheme can help achieve the policy goals of the regulator, namely, lowering telecommunications tariffs and facilitating the introduction of new convergent-type services, far more effectively than the current retail-minus pricing scheme. The findings of this study may assist firms in developing business models based on 3G networks and telecom regulators in designing policies related to interconnection, mVoIP, prepaid calls, wholesale services, and network neutrality.     

Collectivism,individualism, and outgroup cooperation in a segmented China

A consistent theme in cross-cultural management research is that collectivists are more cooperative than individualists. We use Hofstede's measure for individualism–collectivism and combine it with an experimental measure of cooperation to test this relationship in China. In contrast to the established paradigm, we find that groups with higher individualistic scores are more cooperative than those groups with higher collectivistic scores. We attribute these results to groups being composed of outgroup members. In addition, we find that subjects from the more developed coastal area are more individualistic and cooperative than are subjects from inland China.

应用CGI技术创建CAI网页计数器

:CGI( Common Gateway Interface)是应用程序与 Web服务器交互的一个标准接口 ,利用该技术可以实现 HTML不具备的交互式主页功能。本文将通过“教育窗”主页的访问 (点击 )计算器的开发应用实例 ,提出了两种使用 CGI技术实现点击计数的方案     

钻井现场H2S气体的探测及防护

在钻井生产过程中，实施HSE管理体系，预防和控制H2S，保护每一位员工不受H2S气体危害，是钻井生产过程中HSE工作的重要一环。阐述了有害气体H2S的物理特性、毒性标准，介绍了几种常用的H2S气体探测器，以及具体操作方法。     

电子产品的电磁兼容性设计

首先介绍电磁兼容性的基本概念与研究领域,然后重点阐述电子产品的电磁兼容性设计与测量。     

SPYRO在烯烃原料生产方案测算中的应用

文章对SPYRO裂解模拟软件在石化企业烯烃生产原料优化方案测算中的应用进行了比较深度的概括分析.结合该软件在上海石化的实际应用,认为在劣质化原油加工份额不断增加的趋势下,SPYRO裂解模拟软件有助于石化企业在烯烃生产原料优化选择、生产计划合理安排、原油加工生产效益比较等方面为企业相关决策者提供有效地帮助.