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This work, concentrated on the asymmetric allylation of aldehydes controlled by different chiral auxiliaries prepared from rotational pure tartaric acid, can be divided into three parts.The first part aims to review the developments of chiral drugs and asymmetric synthesis, from which derived the present research topic backgrounds and works.Synthesis and applications of allylation from aldehydes are the second part of the thesis. By optimizing the reaction conditions, such as solvents, temperature, time and chiral auxiliaries like N,N\'-dibenzyl tartamide, N,N\'-p-dimethylphenyl tartamide, N,N\'-o-dimethylphenyl tartamide, N,N\'-o-dichlorophenyl tartamide, N,N\'-a-dinaphyl tartamide, N,N\'-dicyclohexyl tartamide and N,N\'-diphenyl tartamide, ideal experimenttal conditions are obtained according to HPLC monitoring, as well as the auxiliaries\' recoveries experiments. Starting from benzaldehyde and 3-bromopropaldehyde, N,N\'-dibenzyl tartamide is considered the best auxiliary in this reaction.
本文介绍了醛的不对称烯丙基化反应,以光学纯酒石酸为原料,研究了不同构型手性配体在醛的烯丙基化反应中的立体选择性,全文共分三部分十个章节:第一部分对当前手性药物和手性技术进行了概述,并由此展开了本文的研究背景和任务;第二部分为有机合成部分,对醛的不对称烯丙基化反应进行了深入探讨,以苯甲醛为原料对反应条件进行优化,在优化的反应条件下对制备的七种可回收手性酰胺配体(N-苄基酒石酸二酰胺、N-对甲苯基酒石酸二酰胺、N-邻甲苯基酒石酸二酰胺、N-邻氯苯基酒石酸二酰胺、N-a-萘基酒石酸二酰胺、N-环己基酒石酸二酰胺和N-苯基酒石酸二酰胺)进行筛选,优化配体回收实验条件,最终确定出N-苄基酒石酸二酰胺在苯甲醛的不对称烯丙基化反应中具有较大优越性,结晶回收的手性配体光学纯度保持不变。
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The aroma of the enzymic concentrate juice storage at 4℃ is the best among different treatment in 90 days, the second is the enzymic concentrate juice storage at 25℃.
不同处理的果汁经过90天的贮藏观察,酶解4℃贮藏的果汁风味最好,其次是加酶25℃贮藏的果汁。
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Heling Shanghai Trading Company was established in March 2006, with the best location and timing of it, mainly to the textile trade industries and brand-building operations, implementation of three lines parallel development of the business model: First, the building of professional Heling clothing brand, design, production and marketing of three processes to integrate operations, integration of services; Second, the clock with their own advantages and popularity, the brand dedicated to the implementation of agency services industry; Third, according to market demand for differentiated And the vast majority of businessmen brand positioning, to provide all kinds of textile materials, auxiliary materials and fabric.
上海何凌商贸有限公司成立于2006年3月,占尽天时地利与人和之便,主要致力于纺织贸易行业的品牌建设和经营,实行三条线路平行发展的经营模式:其一,建设专业的何凌服装品牌,对设计、生产和销售三个流程进行整合运作,实现一体化服务;其二,凭借自身地脉和人气优势,竭诚为各行业品牌实行代理服务;其三,根据市场差异化需求和广大商家的品牌定位,提供各种纺织面料,辅料和坯布。
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The effect of roasting temperature, roasting time and the reducer dosage on the leaching ratio has been studied. The best process condition is cinder/ lignite is 1/0.8, the roasting temperature is 800, the roasting time is 20min. The second is vitriol lixiviate.
本工艺分四个阶段进行:首先是硫铁矿烧渣的还原焙烧,探讨了焙烧温度、焙烧时间和还原剂用量对铁的还原浸出率的影响,得到的最佳工艺条件为烧渣:褐煤=1:0.8,焙烧温度800℃,焙烧时间20min。
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When Kevin Maney published his Media Shakeout which became the annual best seller in 1995, the announcement of an incoming media-integrated era based on internet technologies has been predicted. Ten years afterwards, when the internet came cross its second wave of investment, The Long Tail written by Chris Anderson became the theoretic basis of innovating business models developed on technologies of internet new media, and provided internet new media with solid basis for further applications.
当Kevin Maney在1995年出版著作《Media Shakeout》成为当年《商业周刊》年度畅销书之一时,就预示了基于互联网技术的媒体融合时代即将来临;十年之后,在互联网迎来第二波投资热潮之际,Chris Anderson著作的《The Long Tail》成为建构与互联网新媒体技术之上创新商务模式的理论基础,让互联网新媒体具备了技术及应用的构架。
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The results show that the best second extraction condition for naringenin was as follows: 7:3 for concentration ratio of methanol and ethanol, 50 for temperature, 5 h for time, and 1:45 for stuff and liquor ratio.
通过实验确定了柚皮素的最佳二次提取条件为乙醇甲醇浓度比7:3、温度为50℃、时间为5h、料液比为1:45,采用分光光度法测得柚皮素平均得率为5.25%。
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The Lynn White debate, which begun when White called for a rethinking of Christianity or its replacement by a nonWestern religion, has proved an obstacle to dealing with the environmental crisis The defense of Christianity that followed inhibited Asian and comparative environmental ethics in the West and did not produce environmentally useful results Whenever the relationship of religion and the environment was raised, the discussion quickly shifted to the issue of Christian responsibility for the environmental crisis The problem with the debate is that in many important ways, the White thesis is correct: Christianity is indeed responsible to a significant degree in that Christianity desacralized nature and it supported policies politically in the Middle Ages that encouraged now harmful human population growth and promoted science and technology, much of which has proved to be environmentally problematic There was nevertheless a second tradition of which Saint Francis of Assisi was a part that was environmentally friendly and that could be useful in rethinking Christianity environmentally It is however unlikely that Christianity will prove useful in the development of an environmental ethic in nonWestern countries or that nonWestern religions will succeed in producing an environmental ethic in the West It is therefore important that religious scholars move beyond assigning blame for the environmental crisis and find ways for the major world religions to help develop environmental ethics as best they can within their own cultural spheres
林恩怀特争论始于怀特关于对基督教进行重新思考或者由非西方宗教取而代之的呼吁。林恩怀特争论已经被证明成为处理环境危机的一个障碍。由此而起的对基督教的辩护制约了亚洲和其他比较环境伦理学在西方的发展,没有产生对环境有益的结果。无论何时,当人们谈及宗教和环境的关系的时候,讨论都会迅速转向有关基督教对环境危机责任的讨论。这一争论的关键在于,怀特的论文在很多方面是对的:基督教的确在相当大的程度上造成了自然的世俗化,并且在中世纪,基督教在政治上对现在看来有害的人口增长的政策提供了支持,促进了科学和技术的发展,很多诸如此类的政策已经被证明对环境是有害的。但是,基督教还存在另一种对环境友好的传统,Assisi城的&圣芳济&运动就是其中一例,这种传统也许对于从环境角度重新认识基督教是有益的。但是,对于非西方国家环境伦理的发展,基督教将很难能够有所作为,非西方宗教也不大可能成功地在西方产生出某种环境伦理。因此,对于研究宗教的学者们而言,重要的是要走出谁应该为环境危机受到指责的争论,找到世界各主要宗教如何在其各自的文化范围内对发展环境伦理提供最佳帮助的方法。
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Design the structure of high performance Low-E film including its material and thickness of every layer according to basic optical theory. Carry out an innovative work to calculate its optical performance by characteristic matrices and optical admittance. Compare the results with those we get by traditional measurement.3. Prepare Low-E films with RF magnetron controlled reactive sputtering. The result shows that in the visible region (380nm-780nm), the highest transmittance is 82.4% while the average value is 75%. In the NIR region (780nm-2500nm), the average transmittance is 16.2%. These characters can fit the demand of the glass used in architecture and cars, and also in other applications.4. We novelly use the material Titanium as protective layer to solve the problem that Ag layer would disappear when depositing the second TiO_2 layer. As the protective layer, Ti does not increase the number of targets so as to lower the costs. The thickness of the protective layer Titanium is adjusted by controlling of sputtering time. Results shows the Low-E films get the best optical character when the sputtering time of Titanium is 20 seconds5. We novelly proposed a new transmittance quality factor Q=_·(?_-__ to evaluate the performances of Low-E films, which makes it easier to judge the qualities of Low-E film.6. The photocatalysis of Titanium dioxides is researched and introduced into Low-E films. Sb-doped TiO_2 thin films are prepared. Its photocatalysis and hydrophilicity are measured.
论文的工作主要有:1、总结了低辐射薄膜的制备方法,性能,以及国内外最新研究进展和应用,并对两种类型的低辐射薄膜进行了比较。2、从光学基本理论开始,设计了离线低辐射薄膜的结构,包括每一层的材料和厚度,并创新性的用特性矩阵和光学导纳理论计算了该离线膜的光学性能,利用软件对其进行了仿真,与实际制备的薄膜所测量的性能相比较。3、完成在实验室仪器上制备低辐射薄膜,掌握其工艺条件,解决了超薄金属膜的制备问题,所制备的低辐射薄膜在可见光区(380hm-780hm)最高可达82.4%,平均透射率为75%;在近红外区(780nm-2500nm)的平均透射率为16.2%,其性能达到建筑物幕墙玻璃,汽车前挡玻璃等应用标准,并为进一步的大规模生产打下基础。4、针对中间银层在镀上层膜时易被氧化这一工艺难题,本研究创新性的提出用Ti膜作为保护膜,没有增加新的靶材,提高了生产效率,并节约了生产成本。
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Results indicate that the best time to add FBS is in the fourth day, but in the second day, the development of parthenogenetic embryos is blocked.
结果表明,添加FBS的时间以4d开始效果较好,在胚胎发育的0d、2d开始添加不利于孤雌胚胎的发育。
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Personally,i believe i am just the person who can best fill this position.to begin with,my major , my degree exactly meet the basic requirements of the advertised position.second,i have 6 years of experience rotating in surgical departments.as having pererrorerrorerrorformed 2000 or so procedures,i am able to deal with most basic clinical problems in most surgical departments,and i am good at all kinds of basic surgical skills and procedures,including tracheotomy,endotracheal intubation,thyrocricocentesis,central vein catheterization,external lateral ventricular drainage,closed drainage of thoracic cavity,peritoneocentesis,suprapubis vesicopun c ture,gastrointestinal decompression,urethral catheterization,cranial traction,bone marrow pun c ture,plaster immobilization, routine fracture fixation and traction, phlebotomy , excellent debridement and suturing, and so on.conclusively,i am competent in most basic surgical work and good at organising residents on first aid work.
我自信我正是贵公司所需要的雇员。首先,我的学历,学位和工作经验正符合贵公司在网站中告知的该职位的应聘条件。其次,我有 6 年的外科各科室轮转的工作经历。毕业至今我已经参与完成大小手术 2000 台次,鉴于此,我能处理各外科科室的基本临床问题,熟练进行外科各科室的基本临床操作和手术,比如气管切开术,气管内插管术,环甲膜穿刺术,中心静脉置管术,侧脑室外引流术,胸腔闭式引流术,腹腔穿刺术,胃肠减压术,耻骨上膀胱穿刺术,导尿术,颅骨牵引术,骨髓穿刺术,各种骨折固定和牵引术,静脉切开术,娴熟的清创缝合术等。总的说来,我能胜任外科各科室临床常规工作并组织住院医师进行急救工作。
- 相关中文对照歌词
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- 推荐网络例句
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On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.
另一方面,更重要的是由于城市住房是一种异质性产品。
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Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.
气候直方图是将所收集的降水量测定值,分为几个相等的区间作为横轴,并将各区间内所测定值依所出现的次数累积而成的面积,用柱子排起来的图形,也叫做柱状图。
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You rap, you know we are not so good at rapping, huh?
你唱吧,你也知道我们并不那么擅长说唱,对吧?