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莫胜钧 《华南师范大学学报(自然科学版)》1986,(1):1
本文总结了人体及水中26种成分的测定方法,测定技术及实际应用.分析对象包括地表水、全血、血清、尿、胃液、人体组织等.测定成分包括Be、Cr(Ⅲ)、Cr(Ⅵ)、Co、Ni、Mo、V、Cd、Fe、Mn、Sr、Ba、K、Na、Ca、Mg、CuZn、As、Sb、Se、Sn、Bi、总汞、无机汞和有机汞等.采用的方法有直接火焰法.萃取火焰法、加热雾室火焰法、微量取样火焰法、石墨炉、钽舟、氢化法和冷原子吸收法等. 相似文献
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非洲的语言分布极不均衡。非洲各国在官方语言的选择上一般呈现三种类型:第一,正式认可殖民语言强势地位(通常形成单语制政体)的国家,例如佛得角、科特迪瓦、塞内加尔、马里、布基纳法索、贝宁、加蓬、几内亚、几内亚比绍、冈比亚、塞拉利昂、利比里亚、加纳、多哥、尼日尔、尼日利亚、南苏丹、莫桑比克、纳米比亚、安哥拉、赞比亚、马拉维、博茨瓦纳、圣多美和普林西比等。 相似文献
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《安徽理工大学学报(自然科学版)》2009,29(4)
《安徽理工大学学报》为安徽理工大学主办的综合性自然科学学术刊物,本刊为季刊,国内外公开发行,主要刊载地质工程、环境工程、测绘工程、采矿工程、安全工程、信息管理与信息系统、土木工程、建筑学、机械工程、测控技术与仪器、自动化、电子信息工程、计算机科学与技术、矿物加工工程、化学工程与工 相似文献
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《云南大学学报(自然科学版)》2008,30(3):260
近日,从云南省教育厅获悉,我校张克勤等21人经省专家组考核,达到云南省高等学校教学、科研带头人培养目标,被授予“云南省高等学校教学、科研带头人”称号,他们是:张克勤教授、董云川教授、李生森教授、甘淑教授、吕宛青教授、张力教授、戴本忠教授、李建平教授、杨临宏教授、牛晓帆教授、罗美娟教授、张学杰教授、谢崇伟教授、陈建华教授、李文均研究员、黄泽教授、曹秋娥教授、梁虹教授、李兵教授、郭建斌教授、许毅副教授. 相似文献
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《中南大学学报(自然科学版)》2012,43(2):789
《中南大学学报(自然科学版)》(ISSN 1672-7207,CN 43-1426/N)是教育部主管、中南大学主办,刊登矿物、冶金、化学、材料、机械、信息、地质、采矿、土木、能源、交通、 相似文献
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Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness. 相似文献
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Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women's language from these perspectives: pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women's language, more attention should be paid to language use in social context. What's more, the linguistic phenomena in a speaking community can be understood more thoroughly. 相似文献
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理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。 相似文献
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As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death. 相似文献
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Miao Maosheng 《华南师范大学学报(自然科学版)》2014,(6)
正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula- 相似文献
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Yang Weitao 《华南师范大学学报(自然科学版)》2014,46(6):137-138
We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re- 相似文献
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Bernard Kirtman 《华南师范大学学报(自然科学版)》2014,(6)
正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that 相似文献
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Michael Springborg 《华南师范大学学报(自然科学版)》2014,(6):136
For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the 相似文献
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《上海师范大学学报(自然科学版)》2014,(5):550
<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with 相似文献