404 research outputs found

    Study on Chiral Symmetry Breaking, Synthesis and Resolution Mechanisms of Co(III) Complexes

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    摘要在化学中分子的手性特征虽常见但却令人迷眩。许多复杂的生命现象可通过分子的手性识别去理解。由于手性在化学、生物化学、医药以及材料科学等领域发挥着越来越重要的作用,研究手性的起源、对称性破缺、传递与放大、手性分子间的相互识别作用以及手性化合物的制备方法等已引起科学家们极大关注。本文主要进行手性金属钴配合物的绝对不对称合成、手性拆分以及立体选择性合成Ni(II)和Co(III)的环己二胺配合物等方面的研究工作,探讨了绝对不对称合成以及相关的拆分和手性识别机理。主要研究结果如下:1.研究了手性cis-[CoBr(NH3)(en)2]Br2的绝对不对称合成及其外消旋体的改进拆分,并对反应产物进行了T...Abstract Chirality or handedness in chemistry is a common but fascinating attribute of a molecule. Many complex phenomena in life are easily understood through the recognition of molecular chirality. Studies on chirality such as chiral origin, chiral symmetry breaking, propagation and amplification of chirality, chiral discrimination among chiral molecules, preparation of chiral compounds, have...学位:理学硕士院系专业:化学化工学院化学系_无机化学学号:20032500

    甘孜地热发电热力计算及优化

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    A geothermal well in Ganzi was chosen for the study. To provide a reference for the design and construc?tion of a geothermal plant, power generation techniques were selected and the thermodynamic process was calculat?ed based on cold and heat source dat

    A study on the effects of aniline on marine algae

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    采用评价化学药品对藻类毒性的标准方法,对苯胺与海洋藻类的相互影响进行探讨。实验结果表明,苯胺对藻类有较大的致毒作用,水体中悬浮物的存在对苯胺有一定的消除作用.并从化学动力学角度讨论了藻类对苯胺的一级降解反应动力学速率常数。The toxicity effects of aniline on marine algae were studied by chemical toxicity. the results showed that aniline could inhibite the marine algae growth, but its toxicity was decreased when thebsuspended matter being. The first order degenerate kinetics constant also was discussed.福建省科学基金资助项目(B0310001

    Features of applying acupoints in clinic of Chengjiang School descendant CHEN Ying-long

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    澄江学派传人陈应龙先生是闽南近现代著名针灸医家,其在临床上注重穴位的选取与运用,强调经络是针灸的物质基础,而穴位是治疗疾病和保健的要枢。其临床取; 穴特色主要表现为:引经据典,精简取穴;注重经络,循经取穴;辨证施治,审因取穴;调理久病,轮流取穴。CHEN Ying-long, a descendant of the Chengjiang School, is a famous; modern acupuncture and moxibustion doctor in Minnan. He focuses on the; selection and application of acupuncture points, emphasizing the; meridian is the material basis of acupuncture, and believes that; acupuncture points is the pivot of disease treatment and health care.; The clinical characteristics of acupoints mainly include selecting the; acupoints according to classical literatures, selecting the acupoints; according to the channel, selecting the acupoints according to the; pathogenesis, and selecting acupoints according by turns

    浅议企业购并中的分期付款方式

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    企业购并中的分期付款方式是:首先估算出被购企业的总价值,在此基础上,考虑目标企业的风险,确定一初始支付额,余下部分按被购企业的未来业绩支付。这样,购买方企业的未来给付额以被购企业已经证实的业绩为依据,在很大程度上避免“给付过多”的风险;而被购企业的股东也可以有机会以实际业绩来证明公司的价值。分期付款方式虽有这样的优点,但也存在着实际经营业绩难以客观准确评价、不恰当的会计政策和短期行为的出现等缺陷。因此,购买方企业应尽可能以换股方式进行购并,严密界定经营业绩的计量标准

    Analyses on nitration in bottom water in marine-cage-cultured area

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    根据1998年4月至1999年2月对厦门西海域网箱养殖区底层海水中NH3 N、NO2-的含量变化规律的分析,结合环境因子水温(t)、DO、pH、COD等对发生在养殖底层海水中的氮的硝化作用进行了分析。结果表明,网箱养殖区底层水N的正常代谢偶联,是养殖水体保持稳定的重要条件。Based on monitoring data from Aug.1998~Feb.1999 in marine cultured cage from western Xiamen sea,the variation of NH3N,NO2-, relationships among NH3N,NO2- and enviornmental key parameters (t,DO,pH) were disscussed .Nitration also was analysed. The result shown that metabolism coupling of nitrogen is the basis of selfpurification ability in the bottomwater and to keep it stable in marinecagecultured.福建省专项基金(K81119

    Relation between dissolved oxygen and environmental factors in different farming waters

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    根据2003年7月到2004年6月间对厦门铁道公司东山牙鲆工厂化养殖车间和同安湾网箱养殖区养殖水体水环境监测的资料分析整理而得。研究结果表明:东山牙鲆养殖车间的DO、NH4-N、NO2-N均达到了二类渔业水质标准,但COD偏高,超出四类渔业水质标准。在工厂化养殖中,由于受人为的影响,DO与其他环境因子不存在线性关系。而在同安湾,NH4-N、NO2-N、DO和COD均达到了二类渔业水质标准,同时DO与COD,DO与NH4-N之间都存在较好线性关系。The chemical characteristics in different farming waters were determined from Jul.2003 to Jun.2004.The contents of DO,NH4-N and NO2-N are coincided with the second class fishery water quality standard in Dongshan Paralichthys olivaceus farming workshop,but COD is beyond the fourth class fishery water quality standard.Owing to the anthropic factor in the Industrial P.olivaceus Farming,DO isn't linear with other environmental factors.The contents of DO,COD,NH4-N and NO2-N are coincided with the second class fishery water quality standard in Tong'an Bay,and DO is linear with other environmental factors well.福建省自然科学基金资助项目(FD2003301

    Seasonal variation and assessment of water quality in Meizhou Bay

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    根据2005年1月~2005年11月间4个航次的调查资料,阐述了湄洲湾海域营养盐的变化特征,并对NH4-N、NO3-N、NO2-N、PO4-P、pH、盐度、DO、COD和叶绿素等进行了分析,对海域进行了富营养化评价及有机污染评价。结果表明:该海域N、P营养盐随月份呈现不同的变化规律。不同季节的N/P值变化较大。根据有机污染评价,湄洲湾海域属于水质较好类型;富营养化评价的结果显示,湄洲湾海域秋季和冬季处于富营养化状态。On basis of in-situ detecting data during 4 cruises from January to November in 2005,variation features of inorganic nitrogen and phosphate in Meizhou Bay were analyzed,so were the parameters such as pH,salinity,DO,COD and chlorophyll a.Combined with the economy developing status of Meizhou Bay,the main parameters of water quality,the status of nourishment and organic pollution were assessed.The results indicate that,the value of N/P varies with seasons,and the water quality is comparatively fine based on the organic pollution estimation,when in autumn and winter,Meizhou Bay is rich in nutrients,which in based on the estimation of nourishment.Suggestions were also made on the basis of the results of water investigation of Meizhou Bay.福建省重大前期专项(2005HZ1014);; 福建省自然科学基金(D0610020

    Assessment on present status and quality of sediment in Xiamen shore bay

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    以福建省污染基线调查中沉积物的部分要素测定结果为依据 ,较系统地描述了厦门港湾沉积物中污染物的分布特征 ,并对其污染状况及环境质量进行了分析和评价。为厦门沿岸沉积物污染的防护和控制提供科学依据The status and quality in sediment in Xiamen shore bay are discussed according to date from the baseline study of ocean contamination in Xiamen. The systematical report on the sedimentary characteristics, distribution features and environmental factors was made. The results will provide the scientific basis for both prevention and controlling of sedimentary pollution in Xiamen Province
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