oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 88 )

2018 ( 2968 )

2017 ( 3171 )

2016 ( 3360 )

Custom range...

Search Results: 1 - 10 of 137704 matches for " 周 丽 "
All listed articles are free for downloading (OA Articles)
Page 1 /137704
Display every page Item
高离化态Mn离子的Kα谱线性质的理论研究
Theoretical Research on Kα X-Rays of Highly Ionized Manganese Ion
 [PDF]

李会, 金国华,
Applied Physics (APP) , 2013, DOI: 10.12677/APP.2013.37026
Abstract:

基于相对论组态相互作用和多组态Dirac-Fock (MCDF)方法,我们系统地研究和讨论了Ka谱线类氦到类铍的跃迁能级,跃迁几率,吸收振子强度和线强度的性质。组态相互作用计算包括Breit相互作用,量子电动力学修正。我们的理论数据与可得到的实验数据(类氦和类锂)符合得很好,这些数据为等离子体锰离子的研究提供了有价值的信息。

By using relativistic configuration interaction (RCI) and multi-configuration Dirac-Fock (MCDF) method, we have calculated the transition energies, transition probabilities, absorption oscillator strengths and line strengths Kα X-ray from MnXVII through XXIV. Furthermore, configuration interaction includes Berit interaction and quantum elec- trodynamics (QED) corrections. Our calculated results are compared with the other available data on He-like and Li-like manganese and are in accord with them. The present wide range data are useful for studying manganese plasma.

 

督导教练式大学语文教学模式探索与实践
A Supervising Approach to College Chinese Teaching: Research and Practice
 [PDF]

金声,
Chinese Traditional Culture (CnC) , 2014, DOI: 10.12677/CnC.2014.23006
Abstract:
为解决大学语文课程课时少而学习内容多、侧重汉语能力培养的要求,我们经多年创造实践总结出了督导教练式教学法。本文从教学阶段设计安排、教学手段的运用和考试策略等方面具体阐述了操作方式和实践成功经验。
To meet the demand that emphasis should be laid on language competence in College Chinese teaching which has so much to cover in inadequate periods, we have designed a supervising ap-proach based on years of practice. This paper illustrates the experience of successful practice, through specific procedures in the arrangement of teaching levels, the application of teaching methods and testing strategies.

语用学视角下的《红楼梦》语言修辞
Language Rhetoric in A Dream of Red Mansions from the Perspective of Pragmatics
 [PDF]

冯文, 金声
Chinese Traditional Culture (CnC) , 2015, DOI: 10.12677/CnC.2015.34010
Abstract:
从语用学角度对集汉语表达之大成的巨著《红楼梦》进行分析欣赏,别有洞天。从“直接言语行为”和“间接言语行为”及其语境关系角度分析人物对话,可以进一步看出《红楼梦》人物语言的分寸感十分精当;从会话的“合作原则”之数量原则、质量原则、关系原则和方式原则来看,每一个人物言语都原于生活又高于生活,可谓一部活生生的言语交际教科书。
It’s a hidden but beautiful spot to analyze from a pragmatic perspective to “A Dream of Red Man-sions” which is a culmination of Chinese expressed masterpiece. From the “direct speech act” and “indirect speech acts” and its context relations perspective and dialogue can further be seen that a sense of proportion, the language of the characters in “Dream of Red Mansions” is rather precise and appropriate. From the “principles of cooperation”, we talk about the principle of quantity, principle of quality , principles of relation, principle of manner and find out that every character of the original words are in life and beyond life, which can be described as a living textbook of verbal communication.
Harary图H2m,n的基于距离的拓扑指数计算
Computation of Distance-Based Topological Indices for Harary Graph H2m,n
 [PDF]

, 高炜
Pure Mathematics (PM) , 2016, DOI: 10.12677/PM.2016.63022
Abstract:
化学图论其模型是用图结构来表示分子:原子用顶点来表示,原子之间的化学健用边来表示。本文利用图分析的方法计算Harary图H2m,n每对顶点的距离,并根据拓扑指数的定义给出维纳相关指数的表达式。
In the model of chemical graph theory, the molecular structure is represented as a graph: atoms represented by vertices and chemical bonds between atoms were expressed as edges. In this paper, we calculate the distance for each pair of vertex in Harary graph H2m,n by means of graph analysis, and then determine the expressions of Wiener related indices for Harary graph H2m,n according to the definition of topological indices.
审计基本假设探讨

财会月刊 , 2009,
Abstract: 本文根据审计基本假设是建立和研究审计理论的基石的原理,提出审计基本假设应包括不确定性、可验证性、可信性和独立性,并阐述了这四个假设所相应解决的为什么要进行审计、为什么能进行审计、审计结果为什么会被接受以及审计的根本特征和灵魂是什么四个问题。  【关键词】不确定性可验证性可信性独立性关于假设,亚里士多德曾说过:每一可论证的科学多半是从未经论证的公理开始的,否则论证就永无止境。从这一简短的论述中,我们能认识到假设存在的理由,即没有假设,我们将无法进行推理或思考。同样,审计作为一门社会科学,也离不开自己的一些特定的基本假设。目前,审计理论界对审计假设体系应包含哪些基本假设尚未达成共识。笔者认为,作为审计理论之基石的审计基本假设应能解决以下四个方面的问题:为什么要进行审计、为什么能进行审计、审计结果为什么会被接受以及审计的根本特征和灵魂是什么。故笔者以为,审计基本假设应包含以下四个要素:不确定性、可验证性、可信性以及独立性。
利用重组大肠杆菌发酵甘油合成L-丙氨酸

- , 2016, DOI: 10.13982/j.mfst.1673-9078.2016.6.026
Abstract: 本文探究以甘油为唯一碳源发酵合成L-丙氨酸的可行性。以删除了乙酸、甲酸、乙醇、琥珀酸、乳酸代谢产物合成途径的Escherichia coli B0016-050为出发菌株,用λ pL启动子及其调控下的嗜热脂肪芽孢杆菌(Geobacillus stearothermophilus)来源的丙氨酸脱氢酶基因(alaD)替换B0016-050菌株染色体上丙氨酸消旋酶基因(dadX),获得温度控制型L-丙氨酸合成菌株B0016-060BC。菌株B0016-060BC以甘油为唯一碳源进行两阶段发酵(包括菌体生长阶段和L-丙氨酸合成阶段),表明在菌体生长至对数后期起始L-丙氨酸合成或者提高L-丙氨酸发酵阶段的通气量可提高L-丙氨酸合成水平。进一步经5 L发酵罐发酵,可合成63.64 g/L L-丙氨酸,整个发酵阶段体积生产强度达到1.91 g/L h、转化率达到62.89 g/100 g甘油,仅合成少量的乙酸(1.73 g/L)等副产物。实现了以甘油为唯一碳源高效合成L-丙氨酸,为工业应用提供了重要参考。
The feasibility of L-alanine fermentation using glycerol as a sole carbon source was investigated. The recombinant strain Escherichia coli B0016-050 with deletions of acetate, formate, ethanol, succinate, and lactate synthesis routes served as the parent strain. The λ pL promoter and L-alanine dehydrogenase (derived from Geobacillus stearothermophilus) controlled by the λ pL promoter were used to replace the dadX gene (encoding L-alanine racemase) on the chromosome of strain B0016-050 to generate the thermoregulated L-alanine fermentation strain B0016-060BC. The fermentation by strain B0016-060BC was a two-phase process (consisting of a cell growth phase and an L-alanine synthesis phase) with glycerol as the sole carbon source, indicating that L-alanine production in strain B0016-060BC could be improved by initiating the production in the late exponential growth phase or by increasing air supplementation in the fermentation stage. Fermentation in a 5-L bioreactor yielded 63.64 g/L L-alanine, with overall productivity and yield of 1.91 g/L h and 62.89 g/100 g glycerol, respectively, and only a small amount of acetate (1.73 g/L) was produced as a byproduct. Therefore, the efficient production of L-alanine using glycerol as the sole carbon source is possible, providing an important reference for industrial applications.
利用重组大肠杆菌发酵甘油合成L-丙氨酸

- , 2015, DOI: 10.13982/j.mfst.1673-9078.2015.12.035
Abstract: 本文探究以甘油为唯一碳源发酵合成L-丙氨酸的可行性。以删除了乙酸、甲酸、乙醇、琥珀酸、乳酸代谢产物合成途径的Escherichia coli B0016-050为出发菌株,用λ pL启动子及其调控下的嗜热脂肪芽孢杆菌(Geobacillus stearothermophilus)来源的丙氨酸脱氢酶基因(alaD)替换B0016-050菌株染色体上丙氨酸消旋酶基因(dadX),获得温度控制型L-丙氨酸合成菌株B0016-060BC。菌株B0016-060BC以甘油为唯一碳源进行两阶段发酵(包括菌体生长阶段和L-丙氨酸合成阶段),表明在菌体生长至对数后期起始L-丙氨酸合成或者提高L-丙氨酸发酵阶段的通气量可提高L-丙氨酸合成水平。进一步经5 L发酵罐发酵,可合成63.64 g/L L-丙氨酸,整个发酵阶段体积生产强度达到1.91 g/(L?h)、转化率达到62.89 g/100 g甘油,仅合成少量的乙酸(1.73 g/L)等副产物。实现了以甘油为唯一碳源高效合成L-丙氨酸,为工业应用提供了重要参考。
The feasibility of producing L-alanine via fermentation, using glycerol as the sole carbon source was investigated. The recombinant strain Escherichia coli B0016-050 lacking routes to metabolites like acetate, formate, ethanol, succinate, and lactate within its metabolic network served as the starting strain. The gene encoding L-alanine dehydrogenase, alaD, from Geobacillus stearothermophilus, which was controlled by the left promoter from phage λ (λ pL promoter), was used to replace the alanine racemase-encoding dadX gene in the genome of strain B0016-050 to generate the thermoregulatory L-alanine-producing strain B0016-060BC. Strain B0016-060BC carried out a two-phase fermentation (including a cell growth phase and an L-alanine-producing phase) with glycerol as the sole carbon source, and the results indicate that L-alanine production by strain B0016-060BC can be improved by initiating L-alanine production at the late exponential growth phase or by increasing the aeration rate during fermentation. After fermentation in a 5-L bioreactor, 63.64 g/L L-alanine was produced with an overall productivity and conversion rate of 1.91 g/L h and 62.89 g/100 g glycerol, respectively. Only small amounts of acetate (1.73 g/L) and other byproducts were synthesized. Therefore, efficient L-alanine production using glycerol as the sole carbon source was realized, providing an important reference for industrial application.
UHPLC-DAD-ESI-MS/MS法分析紫山药块根和茎叶中酚类物质

- , 2016, DOI: 10.13982/j.mfst.1673-9078.2016.11.046
Abstract: 本文采用微波辅助法,以80%甲醇作为溶剂提取经冻干后紫山药块根和地上茎叶中的多酚类物质,提取物经超高效液相色谱分离、电喷雾串联三重四级杆质谱正和负离子方式检测分析。根据液相保留时间、紫外吸收、相对分子质量和二级碎片离子等信息,结果表明,紫山药块根和茎叶中酚类物质主要为酚酸、花色苷及黄酮类化合物。分析得到的29种酚类化合物中,5-O-咖啡酰奎宁酸、阿魏酰奎宁酸(tR:12.289)、迷迭香酸、芦丁和槲皮素为块根和茎叶共有组分,块根中另含有芥子酸、芥子酸葡萄糖苷、丁香酸衍生物、香豆酸衍生物、阿魏酸衍生物、芥子酸二葡萄糖苷和花色苷等11种酚类物质。茎叶中除5种共有组分,还含有咖啡酸、咖啡酰奎宁酸甲酯、咖啡酰莽草酸、对香豆酰奎宁酸、香豆酰奎宁酸甲酯、山奈酚-3-O-芦丁糖苷与迷迭香酸甲酯等13种酚类化合物。
Total polyphenols were obtained from the freeze-dried root and leaf of Dioscorea alata by microwave-assisted extraction using 80% methanol as the extraction solvent. The extract was analyzed by ultra-high-performance liquid chromatography with diode array detector coupled with electrospray ionization-tandem mass spectrometry (UHPLC-DAD-ESI-MS/MS) in the positive/negative ion mode. Based on the retention time, ultraviolet absorption, relative molecular weight, and MS2 fragmentation pattern in LC-MS chromatography, the main phenols in the root and leaf of Dioscorea alata were phenolic acids, anthocyanins, and flavonoids. Twenty-nine phenolic compounds were identified in the purple yam, and 5-O-caffeoylquinic acid, feruloylquinic acid (tR: 12.289), rosmarinic acid, rutin, and quercetin were the common components in both root and leaf. Eleven further phenolic compounds were identified from the root of purple yam, including sinapic acid, sinapic acid-glucosides, syringic acid derivatives, coumaric acid derivatives, ferulic acid derivatives, sinapic acid-diglucoside, and anthocyanins. Furthermore,13 phenolic compounds were found in the leaf of purple yam, including caffeic acid, caffeoylquinic acid methyl ester, caffeoyl shikimic acid, p-coumaroylquinic acid, coumaroylquinic acid methyl ester, kaempferol -3-O-rutinoside, and rosmarinic acid methyl ester.
《沁园春·雪》朗读试析


- , 2015,
Abstract: 感情是诗词的生命.诗词借助感情去感染人,给人以美感.诗词宜于朗读.人们在朗读中进一步欣赏诗词,体味诗词.朗读诗词需要理解诗词的内容,把握住诗词所表达的感情,并借助声调的高低,停顿的长短,速度的快慢,吐音的轻重将其内容和感情表达出来.
改革现行会计信息生产模式的理论探析

财会月刊 , 2006,
Abstract: 当前,由上市公司生产会计信息,然后由会计师事务所检验会计信息,最后由信息使用者消费会计信息,这种会计信息生产模式不利于社会资源的有效配置,同时又是造成会计信息失真的主要原因。在新的经济条件下,会计信息生产社会化应运而生,本文将经济学中的市场失灵和管制理论运用到上市公司现行会计信息生产模式改革的探讨中,指出会计信息生产社会化是当前会计理论与实践的必然选择。  【关键词】会计信息生产模式社会化市场失灵管制会计信息是一种极其复杂而又非常有用的商品,它不仅影响到投资者个人的决策,还影响到资本市场和经理人市场等的运作,从而影响到经济体制的建立及正常运行。然而,目前世界各国虚假的会计信息充斥着经济信息市场,以至于社会各界对会计信息真实性的疑惑越来越重,其根本原因在于人们对会计信息市场普遍存在的失灵问题和管制的局限性认识不足,进而导致会计信息生产在源头上,即生产模式上存在误区。因此,只有改革现行会计信息生产模式,实现会计信息生产社会化才是解决问题的根本途径。  理论之一:市场失灵  经济学研究表明,当竞争性市场运作的条件不能达成时,市场便会出现不同程度的失灵。会计信息市场失灵的原因主要有以下四个方面:
Page 1 /137704
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.