石墨炉原子吸收光谱法测定滑石中酸溶痕量铅镉

研究了石墨炉原子吸收光谱法测定滑石中酸溶痕量铅镉的方法。采用硝酸(φ=5%)加热溶解滑石,既表征自然环境中滑石所能溶出的全部铅、镉,又避免了对石墨管的腐蚀,得到平稳且较高的吸光度。利用试样中溶出基体镁与硝酸形成的硝酸镁作为基体改进剂,使铅、镉的灰化温度分别提高到900℃和500℃,消除了基体干扰,溶出滑石中的其他元素均不影响铅、镉的测定。该方法测定铅、镉量的线性范围分别为0~100μg/mL,0~10μg/mL;检出限分别为1.95μg/L,0.54μg/L。用于滑石中酸溶铅、镉的测定,相对标准偏差分别为     

电感耦合等离子体原子发射光谱法测定Sn-Ag-Cu系焊锡中铅和镉

样品用盐酸、过氧化氢溶解,在少量硫酸存在下,以盐酸和氢溴酸挥锡,电感耦合等离子体原子发射光谱法测定铅和镉的含量。优化了仪器的工作参数,对溶样酸和锡基体等影响因素进行了试验。本法测铅和镉的线性范围分别为0.50～5.00 μg/mL和0.050～0.50 μg/mL ,检出限分别为13.2 μg/L和0.9 μg/L,样品测定结果的相对标准偏差(n=6)均小于4 %,用标准加入法测得回收率分别为97 %～108 %和90 %～96 %。     

原子吸收光谱法测定镝铁合金中Ca、Mg、Ni、Cr、Mn、Cu的含量

研究了原子吸收光谱法测定镝铁合金中 Ca、Mg、Ni、Cr、Mn、Cu的新方法,研究了酸介质、样品基体、共存元素的干扰,确定了实验的最佳测定条件.在优化的实验条件下,测得方法的回收率在98%～115%之间、RSD<5%,方法检出限分别为钙≤0.03μg/mL;镁≤0.005μg/mL;镍≤0.02μg/mL;铬≤0.02μg/mL;锰≤0.02μg/mL;铜≤0.02μg/mL.     

电感耦合等离子体原子发射光谱法测定精制铝箔中铅镉砷

试样用硝酸、盐酸溶解,用电感耦合等离子体原子发射光谱(ICP-AES)法测定铅、镉;用盐酸、硝酸、硫酸溶解,在盐酸介质中以四氯化碳萃取去除铝,然后用ICP-AES法测定砷。测定时选择283.306 nm,226.502 nm,197.262 nm分别作为铅、镉、砷的分析线,基体铝对铅、镉测定的影响采用基体匹配方法克服。对于5μg/mL的As,Pb,Cd,20倍量的Zn,Si,Mn,V,Ti,Mg无干扰。铅、砷的检出限均为0.01μg/mL,镉的检出限为0.001μg/mL。用本法测定铝箔样品中铅、镉、砷,     

粗金粉中金和银的联合测定

运用传统的火试金法处理粗金粉样品,建立了重量法测定粗金粉中金量、火焰原子吸收光谱法测定银量的新方法。采用留铅灰吹的方法使样品中的金银富集在1~2 g的铅合粒中,用HNO₃溶解铅合粒,然后采用重量法测定金量,火焰原子吸收光谱法于波长328.1 nm测定银量。本方法有效地解决了粗金粉中金银不能联合测定的难题,银的方法检出限为0.003 1 μg/mL。将该法用于实际样品分析,测定结果与国标法测定结果一致,金的相对标准偏差≤0.07 %,银的相对标准偏差≤1.2 %,且金和银的银回收率分别为100 %和98 %~101 %之间。     

硫脲介质-火焰原子吸收光谱法连续测定多金属矿石中的银镉

传统火焰原子吸收光谱法测定Ag、Cd,样品需单独处理,耗时且成本高。建立了火焰原子吸收光谱法连续测定多金属矿石中银、镉的方法,样品经盐酸、硝酸(氟化氢铵)分解,盐酸提取可溶性盐,在硫脲介质中火焰原子吸收光谱仪连续测定Ag、Cd。方法检出限分别为Ag 0.005 4μg/m L、Cd 0.003 2μg/m L,Ag、Cd测定结果的相对标准偏差分别为0.7%~2.8%、0.4%~2.4%,加入标准物质回收率分别为97.5%~103.6%、96.4%~104.0%。该方法酸的用量少,环境污染程度低,准确度和精密度良好。     

火焰原子吸收光谱法测定汽油中铁镍铜

用碘-二甲苯溶液对汽油进行氧化处理,硝酸(1+9)萃取,以原子吸收光谱法测定汽油中铁、镍、铜。铁、镍、铜的测定波长分别为248.3nm,232.0nm,324.8nm;检出限分别为0.0005μg/mL,0.0004μg/mL,0.0001μg/mL;工作曲线的线性范围为0.002～40.00μg/mL,0.001～50.00μg/mL,0.001～6.00μg/mL。对氧化剂、萃取剂的浓度及用量进行了试验,选择了最佳萃取时间。汽油中对被测元素有干扰的元素均在允许量范围内。方法用于汽油样品的分析,铁、镍、     

火焰原子吸收光谱法测定电铅中镉量

采用硫酸铅分离主体后于5％硝酸介质中用原子吸收光谱法测定,线性范围0-1．0μg/mL,应用于电铅中微量镉的测定,获得满意结果。     

阻抑过氧化氢氧化偶氮胂I褪色动力学光度法测定痕量铅和镉

基于氨水溶液介质中,痕量镉和铅对过氧化氢氧化偶氮胂I褪色有阻抑作用,建立动力学光度法同时测定痕量铅和镉的新方法.方法测定铅、镉的线性范围分别为0.005～0.50μg/mL和0.002～0.80μg/mL.大多数共存离子不干扰测定,Mg2 ,Ca2 ,Zn2 ,Sn2 等离子的干扰可通过双硫腙萃取-反萃取的方法消除.方法用于实际样品中铅、镉同时测定,标准加入回收率分别为98%～101%,96%～97%;相对标准偏差各小于3.0%,2.6%.     

火焰原子吸收光谱法测定高纯铅中痕量钙、镁和钠

研究了电解法除去大量基体铅后,采用火焰原子吸收光谱法测定高纯铅中痕量钙、镁和钠。对电解酸度,电解时间及铂电极的清洗进行探究,结果表明,选用HNO3(1+3)作为溶解电解样品的介质且电解时间为3 h,铅残余量最小;与盐酸清洗铂电极相比,采用20 g/L抗坏血酸-乙酸(φ=4%)混合溶液清洗铂电极可减小铂电极的损耗。铅中其他共存元素不干扰钙、镁、钠的测定,方法检出限分别为0.061μg/mL,0.006 6μg/mL,0.011μg/mL。对铅样中Ca,Mg,Na的测定,相对标准偏差为14%~19%,加标回收     

深云立交桥梁检测及加固改造

根据深云立交桥梁的检测结果，对该桥目前的整体状况、工作状态，及其使用情况做出综合评价，对桥的病害原因进行了分析，并提出合理的加固方案。     

材料科学技术转型发展与钢铁创新基础设施的建设

摘要：在第4次工业革命浪潮的推动下,钢铁科学与技术正在经历数字化、智能化转型。钢铁行业全流程各工序均为“黑箱”,为多场、多相、多变的巨系统,具有复杂相关关系和遗传效应等。这些不确定性带来了巨大的挑战。挑战和机遇并存。这些不确定性提供了智能化和数字化技术的应用场景资源;钢铁行业极为丰富的大数据提供了挖掘其中蕴含客观规律的数据资源;现代的数据科学、智能技术为解决不确定性问题提供了强大的手段。以数据为中心,以工业互联网为载体,以实验工具、数字数据、计算工具为支撑,建设钢铁企业材料创新基础设施,将可以大幅度提高研发效率,降低研发成本,有力地支撑钢铁材料科学与技术的转型发展。实验工具平台除了传统的实验室仪器装备和中试装备之外,实际生产线被作为主要的实验工具。这些实验工具提供丰富、精准、写实的历史数据和现实生产数据,特别是生产线装备提供实际生产大数据,蕴含着生产过程中的全部规律,是极宝贵的数据资源。利用机器学习、深度学习等现代数据挖掘技术为计算工具,对这些数据资源进行处理、分析、计算,将数据转换为高保真度模型,可以得到具有“原位分析能力”的数字孪生。在工业互联网的总体架构下,以数字孪生为核心,组成信息物理系统,构建起基于数据自动流动的状态感知、实时分析、科学决策、精准执行的闭环赋能体系,解决生产制造、应用服务过程中的复杂性和不确定性问题,提高资源配置效率,实现资源优化,对材料行业转型发展提供关键技术支撑。虚实映射、实时交互、精准控制的信息物理系统与材料创新基础设施合二为一,以材料创新基础设施为基盘,形成具有“原位分析能力”的数字孪生,建设钢铁生产全流程、一体化的信息物理系统,必将推进钢铁行业智能制造蓬勃开展和数字化、智能化转型。     

Praise and Blame and Robinson.

Daniel Robinson suggests that much of the civil and criminal law "serves as the institutionalized form of praise and blame". Indeed it does. Pulling at this thread of Robinson's tapestry leads the reader straightaway to a host of truths about how law and morality not only intersect, but work together in harmony. "[L]aw", Robinson says, is a "vivid expression of deeper and impenetrably complex moral theories". This essay explores several of these harmonies, but focuses on two. One is that political society must be seen as the cooperation of free persons according to law, which persons hold common moral understandings. The second has to do with retribution as the moral justifying aim of punishing criminals. The author goes beyond Robinson's limited praise of retribution, and shows that some central features of our practice of punishment are understandable only within the retributive framework. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

《儿子与情人》的语码转换与男女二元对立

劳伦斯小说《儿子与情人》一个鲜明的语言特色就是标准英语和当地方言频繁的语码转换。莫瑞尔用方言来对抗妻子,而妻子坚持用标准英语,偶尔也用方言来讽刺、挖苦丈夫。语码转换反映了劳伦斯男女二元对立的哲学思想。     

Voices of fear and anxiety and sadness and depression: The effects of speech rate and loudness on fear and anxiety and sadness and depression.

Two studies investigated the role of expressive vocal behavior (specifically, speech rate and loudness) in fear and anxiety and in sadness and depression. In the 1st study, participants spoke about personally experienced fear and anxiety-arousing and neutral events using 3 different voice styles: fast and loud, normal, and slow and soft. In the 2nd study, participants spoke about personally experienced sad or depressing and neutral events using the same 3 voice styles. In both studies, the participants' highest levels of subjective affective and cardiovascular (CV) arousal occurred when they spoke about the emotional events in a mood-congruent voice style: fast and loud in the case of fear and anxiety, and slow and soft in the case of sadness or depression. Mood-incongruent voice styles canceled the heightened levels of CV arousal normally associated with these negative emotions. The voice-style manipulation had no significant effect on the participants' levels of CV arousal during the neutral discussions. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Status and solidarity in social comparison: Agentic and communal values and vertical and horizontal directions.

Social comparison involves positioning the self relative to others on a vertical or status dimension (ranging from upward to downward comparisons) and a horizontal or solidarity dimension (ranging from contrastive to connective comparisons). Across 3 studies in which 389 undergraduates recorded everyday social comparisons (n = 4,417), downward and connective comparisons were rated as more helpful and mood enhancing than upward and contrastive comparisons. The effects of horizontal comparisons were greater for people for whom solidarity was an important value; however, the effects of vertical comparisons were not greater for people who valued status. The roles of the comparison target, topic, and situation were also explored; for example, noticing undesirable features of the target enhanced status but undermined solidarity. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Aging and negative affect: The rise and fall and rise of anxiety and depression symptoms.

The relationship between aging and negative affect is dynamic and complex. Although prior studies have often cited lower prevalence rates of anxiety and mood disorders among older individuals, these studies may miss the dynamic relationship between symptoms and aging. To evaluate a nonlinear model of the relationship between aging and negative affect, the author examined measures of neuroticism, anxiety, and depression symptoms in a cross-sectional, community sample (N = 335), ages 18 to 93. Results indicated a curvilinear relationship, with mean symptom levels increasing during early adulthood (until the mid-30s) and then showing a small decline until older adulthood (the mid-70s), when symptoms again increase with age. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

钢铁产品交易与展示平台的设计与应用

为解决单个企业的信息化投资风险、从整体上降低企业信息化投入,针对大邱庄钢铁产业的类型特点,设计了一种新型信息化公共服务平台。详细阐述了钢铁产品展示及交易平台的建设内容及系统开发技术。该平台集产品展示、信息查询、用户管理功能于一体,实现了全自动、全智能的在线管理和维护,适用于中小型企业。该平台的应用最大化地发挥了大邱庄的产业优势,对大邱庄工业园区的宣传和市场开拓起到了一定的作用。