ICP-MS准确测定岩石样品中的40余种微量元素分析

以ICP-MS的分析方法去测定岩石样品中的微量元素,以HF+HNO3进行样品密封溶解。应用此方法进行岩石样本元素分析的话不但非常简单,并且还能够非常准确的去测定微量元素。对AGSO和USGS样品岩石中的40余种微量元素进行测量,研究结果表明,除了个别的微量元素在最后的结果中和推荐值偏差在10%左右以外,其他微量元素最后的测定值都在5%左右。     

爱护婴幼儿 精选配方乳粉

婴幼儿配方乳粉是根据不同时期婴幼儿生长发育所需营养特点设计的产品。产品中强化了婴幼儿生长发育必需的维生素和微量元素,调整了脂肪、蛋白质、碳水化合物的比例,是一种营养物质最全、最利于婴幼儿消化吸收的食品。婴幼儿配方乳粉选购常识看包装上的标签标识是否齐全。按国家标准规定,在外包装上必须标明厂名、厂址、生产日期、保质期、执行标准、商标、净含量、配料表、营养成分表及食用方法等项目。营养成分表中标明的营养成分是否齐全,含量是否合理。营养成分表中一般要标明热量,蛋白质、脂肪、碳水化合物等基本营养成分,维生素类如维…     

果汁饮料中营养成分和有害物质的测定

采用5种仪器分别对市场上具有代表性的4种果汁饮料中营养成分和有害物质进行检验,实验结果表明,该方法可以准确测定饮料中的营养成分和有害物质,且果汁饮料总体质量良好。     

如何使用气象色谱法测量水中的硒含量

硒是维持动物生命必不可少的一种微量元素，气象色谱法测定硒含量，简单易行，准确度高，可用于测定各种水样，文章介绍了气象色谱法测定硒含量的基本步骤，分析了产生对测量与数据产生影响的主要原因。     

多元素微肥可执行性计划

目前我国的多数耕地主要施用一两种大量元素肥料，微量元素肥料长期得不到补充。土壤营养成分极端不平衡。其结果由于营养元素之间的拮抗作用，不但导致植物体内微量元素缺乏，大量元素的功效也不能得到充分发挥。全国土壤普查数据资料说明我国农田“缺素”情况相当普遍。同一块地里缺乏好几种微量营养元素，目前已成为制约农作物持续优质高产的主要障碍。     

多元素微肥可执行性计划

目前我国的多数耕地主要施用一两种大量元素肥料,微量元素肥料长期得不到补充,土壤营养成分极端不平衡.其结果由于营养元素之间的拮抗作用,不但导致植物体内微量元素缺北乏,大量元素的功效也不能得到充分发挥.全国土壤普查数据资料说明我国农田"缺素"情况相当普遍,同一块地里缺乏好几种微量营养元素,目前已成为制约农作物持续优质高产的主要障碍.     

火焰原子吸收光谱法测定尿中的钾钠

对24小时尿中微量元素钾、钠、火焰原子吸收法的测定进行了研究,并确立了测定钾和钠的优化条件。加入氯化铯可消除电离干扰,加入镧盐可消除基体干扰,当稀释比例达到1:1000时,可以消除尿基质的干扰。回收率分别为98.7%～105.2%、99.4%～103.4%,精密度为0.64%～0.87%、0.43%～0.81%。结果表明,方法简单准确。     

盛暑之下茶飘香

茶叶富含茶多酚、咖啡碱、氨基酸、维生素以及多种微量元素,具有营养和保健作用.目前,我国茶园种植面积居世界首位,全国茶叶年总产量约70万吨,其中绿茶约占54%,花茶约占20%,红茶约占6%,乌龙茶约占10%,其他茶叶约占10%.     

膳食纤维的应用及检测方法探讨

膳食纤维曾被认为是对人体不起营养作用的一种非营养成分，称为粗纤维。营养学家曾经认为粗纤维吃多了会影响人体对营养素，尤其是微量元素的吸收。然而现代医学和营养学近年来的研究发现，这种“非营养素”与人体健康密切相关。现在，膳食纤维以它独特的生理功能和保健作用与蛋白质、脂肪、碳水化合物、维生素、矿物质、水，并列被称为“第七营养素”。     

产品质量国家监督抽查结果葡萄酒还存在哪些质量问题

葡萄酒是由葡萄汁(浆)经发酵酿制而成的饮料酒，含有对人体有益的多种无机和有机营养成分．如有机酸、氨基酸、维生素、多酚和矿质元索(包括微量元素)等，具有一定的保健作用。     

Measuring the Incidence of Over- and Undereducation

We deploy the unique opportunity of a dataset of Flemish school leavers to measure the incidence of over- and undereducation on the basis of the six applied measures in the literature. The incidence of overeducation in the first job after leaving school ranges from only 8% to 51%, undereducation ranges from 3% to 21%. While 66% is overeducated on the basis of at least one measure, only 3% is overeducated on the basis of every measure. Mismatch correlations range from 5% to 82%. Also the categories in terms of gender, educational level and region of residence with the highest likelihood of being overeducated depend on the measure. These findings clearly underline the weakness of the literature on this subject. However, measuring overeducation in different ways enables to derive some alternative concepts. Genuine overeducation amounts to about 20%. The incidence of over- and undereducation is both attributed to qualification inflation and deflation, and a credential gap. Finally, about 80% of the incidence of overeducation is classified as being structural.     

中国贸易依存度的实证分析

经济全球化的大背景下，特别是中国加入WTO后，中国经济融入世界经济的步伐加快，传统贸易依存度从1978年的9.8%，80年代中期的23%提高到1999年的36.4%，2000年进一步提高到43.9%，其中出口依存度达到23.1%。2003年达到60.4%，出口依存度提高到31.1%。随之而来，部分学者高呼：贸易依存度过高，中国经济安全日益受到危胁，应该降低贸易依存度，本文以分析传统贸易依存度的概念为出发点，结合经济学原理，从一国对国际贸易的依赖程度和对一国的经济贡献角度提出贸易依存度新的度量方法，得出中国外贸依存度是相当低的。     

Global Impacts of the Automotive Supply Chain Disruption Following the Japanese Earthquake of 2011

This paper provides an input–output method to estimate worldwide economic impacts generated by supply chain disruptions. The method is used to analyse global economic effects due to the disruptions in the automotive industry that followed the Japanese earthquake and the consequent tsunami and nuclear crisis of March 2011. By combining a mixed multi-regional input–output model, the World Input–Output Database and data at the factory level, the study quantifies the economic impacts of the disruptions broken down by country and industry. The results show that the global economic effect (in terms of value added) of this disruption amounted to US$139 billion. The most affected (groups of) countries were Japan (39%), the USA (25%), China (8%) and the European Union (7%). The most strongly affected industries were transport equipment (37%), other business activities (10%), basic and fabricated metals (8%), wholesale trade (7%) and financial intermediation (4%).     

成核剂对高流动无规聚丙烯注塑专用料性能的影响

通过成核剂改性高流动无规聚丙烯注塑专用料性能的研究发现:加入成核剂均有不同程度改善PPR的力学性能,NX8000改性PPR的弯曲模量、弯曲强度、冲击强度、洛氏硬度分别提高了8.0%、13.4%、3.0%、8.1%;雾度降低了82.7%、结晶度增加了3℃,成型加工温度降低了40℃。     

Spatially Optimal Allocation of Investments: An Application of the Dynamic Multiregional Social Accounting Matrix

This paper analyzes the effect of regional income disparity on the allocation of investments using a dynamic multiregional Social Accounting Matrix (SAM) model. The optimal shares of total investments required to achieve the most balanced regional growth under the constraint of a 5% fixed annual economic growth rate were 37.74% for the Capital region, 18.83% for the Southeast region, 15.92% for the Central region, 13.90% for the East region and 13.61% for the West region. This policy requires an additional investment of 1.37% of the GDP, bringing about a 52.2% reduction in regional income disparity in terms of the Atkinson index. This implies that the decentralization of investment expenditures to less developed regions would lead to a substantial gain in regional income equity, on the one hand, and to the loss of cost effectiveness in investments, on the other.     

膝关节退行性病变的物理治疗观察

目的:探讨治疗膝关节退行性病的办法,主要是通过物理治疗或者理疗来缓解痛疼控制病情的发。方法:自我手法按摩患处关节15min,扶床蹲下起立及跑车运动各15min后,用超短波治疗,微温量20min,每日1次,10次为1疗程。结果:痊愈3例(33.3%);显效3例(33.3%);好转2例(22.2%);无效1例(11.11%)。总有效率为88.89%。结论:科学的物理治疗对轻、中度患者效果还是比较明显的。     

中国医疗卫生事业效益分析之系列研究——1990～2009年中国卫生事业效益分析

1990-2009年中国卫生事业发展迅速,卫生人员年均增长1.26%,高中级卫生技术人数年均增长4.1%,床位数年均增长2.19%,卫生总费用年均增长17.95%,诊疗人次年均增长1.7%,医师人均年业务收入年均增长15.89%,平均住院日年缩短0.28日,病床使用率提高4个百分点。但整体卫生事业分布、配置、发展不均衡,资源集中在医院,应加大对卫生院、门诊部、社区服务中心、村卫生室等机构的投入力度。     

The economic cost of coronavirus lockdowns

• ▪ Widespread lockdowns and social distancing in economies affected by the coronavirus outbreak are set to cause a massive negative short-term impact on consumer spending and GDP.
• ▪ A large chunk of consumer spending is discretionary and so is very sensitive to being postponed or lost completely due to quarantines and social distancing.
• ▪ The early evidence from China supports the idea that up-front effects will be large, with retail sales down 20% y/y in January–February and industrial output over 13% lower, thanks to widespread factory closures.
• ▪ We estimate that a three-week lockdown affecting 50%–90% of a population would cut consumption in the three–month period featuring such a lockdown by 5%–8%, a six-week lockdown by 9%–16%, and a 12-week lockdown would slash it by 18%–32%.
• ▪ Full-year effects depend on how quickly postponed consumption revives as outbreaks come under control. But even quick recoveries imply big full-year losses: An initial 18% slump in consumption would still imply a full-year loss of 9%, even if spending recovered to pre-pandemic levels in four quarters. If recovery took eight quarters, the full-year loss would be an enormous 14%.

     

某高职院校教学督导工作现状调查分析

目的:了解当前教学督导工作存在的问题,并提出改进策略,进一步完善学校教学督导工作。方法:采用问卷调查、个别访谈、集体座谈等方法,调查本校教师、教学管理人员共163人。结果:35.6%的被调查者对教学督导概念理解正确,71.6%的被调查者认为教学督导十分必要,88%的被调查者认为目前督导评价标准比较合理,97.6%的被调查者对反馈方式满意,87%的被调查者认为督导组评价客观。结论:深入宣传教学督导作用、切实加强督导队伍的建设、进一步规范教学督导内容、完善教学质量监控与评价体系才能有效提高高职院校教学督导工作。     

医院管办分离及其效益分析——以上海市公共卫生临床中心为例

目的:研究公卫中心管办分离前后效益对比。方法:收集2004-2010年连续7年数据报表,以比率分析法和环比法进行数据分析。结果:投入产出均呈上升状态。病床使用率、总支出、医疗支出、固定资产、在职职工人数和卫技人员年均增长率分别为14.45%、100.09%、25.21%、82.69%、5.05%和6.93%。门急诊人数、出院人次、病床周转率、在职职工人均年业务收入、在职职工人均年诊疗人次数和医师人均每日担负诊疗人次年均增长率分别为25.55%、18.55%、29.25%、12.26%、18.19%和19.21%。平均住院日、收支结余率和总资产周转率年均负增长,分别为11.2%、3.23%和5.91%。结论:进一步理顺"管办分离"治理结构,合理投入资产,降低医院管理成本,提高运营资产效率。