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The dissertation mainly consists of two parts:1. The Reaction Chemistry of Alkynes under Palladium Catalysis Part 1 studies the reaction α,β-unsaturated carbonyl compounds with alkenylpalladium intermediate generated by nucleopalladation, and discovered 1 the Pd-catalyzed tandem addition reaction of halides, alkynes and α,β-unsaturated carbonyls,2 the four-component tandem addition reaction of halides, alkynes and α,β-unsaturated carbonyls, 3 the tandem intramolecular oxypalladation-conjugate additionreaction of alkynoic acids with α,β-enals. These new reactions provide notonly efficient highly stereoselective methods for the synthesis of γ,δ-unsaturated,polyunsaturated carbonyl compounds and γ-lactonic aldehydes, but also thebasic transformations for a number of C-C bond formation reactions which can be usedto design synthesis of many acyclic, cyclic or polycyclic compounds.
本论文的主要工作分为两个部分:一、钯催化下炔烃的反应化学在本小组前人工作的基础上,我们详细研究了炔烃亲核钯化产生的烯基钯中间体与α,β-不饱和羰基化合物的反应,发现两价钯催化下卤离子-炔烃-α,β-不饱和醛酮的串联加成反应、卤离子-炔烃-α,β-不饱和醛酮的西组分串联加成及炔酸分子内氧钯化-串联Michael型加成反应;由此发展了γ,δ-不饱和醛酮、多不饱和羰基化合物和带有醛酮基侧链的γ-丁内酯衍生物的高立体选择性合成方法,这一过量卤离子存在下的烯基钯对α,β-不饱和羰基化合物共轭加成反应的发现,为大量碳-碳键形成反应的实现提供了基础,使我们能够从这一基本反应出发,设计和开发多种分子内、分子间的碳碳成键反应,以好的立体、区域选择性组建开链、环状及多环类型的化合物。
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It's with sadness that I report to you that Lorimer Davidson, GEICO's former Chairman, died last November, a few days after his 97th birthday. For GEICO, Davy was a business giant who moved the company up to the big leagues. For me, he was a friend, teacher and hero. I have told you of his lifelong kindnesses to me in past reports. Clearly, my life would have developed far differently had he not been a part of it. Tony, Lou Simpson and I visited Davy in August and marveled at his mental alertness -- particularly in all matters regarding GEICO. He was the company's number one supporter right up to the end, and we will forever miss him. Aviation Services Our two aviation services companies -FlightSafety International and Executive Jet Aviation -- are both runaway leaders in their field.
在这里很遗憾地向各位报告, GEICO 前董事长-Lorimer Davidson,于去年十一月去世,享年 97 岁,对于 GEICO 来说,大卫是带领公司跃上台面的企业巨人,而对我个人来说,他是我的偶像,亦师亦友,在过去年度的报告中,我不只一次的提到他对我个人的关照,很显然的要是没有他,我个人的一生可能要完全改观,Tony,Lou Simpson 与我在去年八月还曾经去拜访他,对于他当时的记忆力还佩服不已,尤其是有关 GEICO 的点点滴滴,一直以来,他就是 GEICO 公司的头号支持者,我们将会永远地怀念他。
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Thereupon, by immense labour on his own part, while his soldiers reflected his energy, and both legates and prefects of the guard led the host, he conquered these exceedingly fierce peoples, accepted the surrender of the Marcomanni, and brought a great number of them to Italy.142
不过,通过他的不懈努力,藉着受到他鼓舞的军人,使节们以及军队的统帅们,他征服了所有这些强悍的民族,接受了马科曼尼人的投降,并将他们之中许多人带到了意大利(142)。
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The central part was composed of hypertrophic chondrocytes, for which the number increased with time. The cartilaginous tissue at the time of 2 weeks' cultivation appeared strongly positive staining of collagen type Ⅱ immunohistochemistry and safranine "O", as well as strongly metachromatic to toluidine blue.
其中心为肥大软骨细胞,且随培养时间的延长而增多。2周时,软骨组织甲苯胺蓝染色呈强的红色异染反应,Ⅱ型胶原免疫组织化学染色呈强阳性,番红&O&染色呈强阳性。
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Our results show that: the number of periodic orbits of a nonintegrable systemdecreases and the system becomes more chaotic as the perturbation on the integrable part is increased.
研究表明:当体系所受的扰动增加时,体系的混沌程度就会不断增加,周期轨迹的数目也越来越少。
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First, from the point of view of production and management, the importance for developing TTU is pointed out.the status in quo of technology,The direction of progress,The demand of practical and fundamentality in Distribution Automation are analyzed for Transformer Terminal Unit. The function of equipment and technical specification which meet demand of practical duty are indicated; Second, the scheme of synchronous sampling,quasi-synchronous sampling,non-integer cycle sampling,nonsynchronous sampling and algorithm are analyzed in detail. Then,the scheme of nonsynchronous sampling and multi-chunnel is ascertained. Moreover, the method of disposal sampling data for increasing precision which calculate the number of sampling per cycle dramatic by searching zero is introduced. The technique for analyzing data,stating data,storage data for Electrical Power Quality and control scheme for compensation capacitor are explained also. Finally, The scheme and structure of hardware,key circuitry using 80C196 singlechip,the scheme and ideology of software and flow chart of part software is introduced simply.
文中首先从电力生产、管理角度出发,指出了研制配变监测终端的重要意义,分析了配变监测终端的技术现状、发展趋势、现场需求以及在配网自动化中的基础地位,提出了满足实际运行要求的装置功能、技术要求;然后对目前常用的同步采样、准同步采样、非整周期采样、非同步采样的方案和算法进行了详细的分析、比较、筛选,确定了非同步采样和顺序采样的方案,并提出了一种寻找过零点从而动态计算每周采样点数的提高精度的采样数据处理方法,文中对装置中电能质量分析、统计、存储的方法以及补偿电容器的控制方案和投切原则也做了重点说明;最后,对应用80C196单片机系统研制的装置的硬件方案、结构以及关键电路和软件设计思路、方案、部分主要软件模块的流程图做了介绍。
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The number of adults, nymphae and eggs of E. vitis is the most on the upper part of tea trees and the less on the lower. In Tieguanyin and Fuding White Tea, the distribution of eggs of E. vitis is both above the third leaf position.
在铁观音和福鼎大白茶茶树上,假眼小绿叶蝉卵的分布均以3叶位以上为主,其中铁观音乌龙茶树上主要分布在2叶位和3叶位,分别占32.07%和27.01%,而在福鼎大白茶上主要分布在2叶位和1叶位,分别占35.42%和28.81%。
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A process for preparing clean gasoline features that under existance of epoxidizing catalyst and alkoxylating catalyst, the olefine in gasoline and the oxygen and alcohol take part in epoxidizing and alkoxylating reactions to generate diolmonoether or dioldiether compounds which has higher octane number, so being excellent gasoline component.
本发明公开了一种清洁汽油的生产方法,在一个具有环氧化的催化剂以及同时具有烷氧化催化组分或者催化剂的存在下,汽油中的烯烃与氧、醇、发生环氧化、烷氧基化反应而生成二醇单醚或二醇双醚类化合物,这类化合物具有较高的辛烷值,是优良的汽油组分。
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I also redesigned a part of the makework daemon, now before it is started it does a precheck over a large interval trying to predict the number of work to be done in a small interval for a workunit.
我也重新设计了工作包生成器的一个部分,现在它在开始工作之前会预先检查一个大的区间,尝试预测一个工作包的小区间的工作量。
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Linked the various factories in Shandong is stronger, the market price is easy to unity, and another part of the factory prices changed little, with preganglionic equivalent low-end offer is 1650-1680 yuan, 1650 yuan less quotes, 1680 quotes for The number of one-third of the following manufacturers.
山东各厂家的连动性较强,市场价格很容易统一,另有一部分厂家出厂价格变化不大,与节前相当,低端报价是1650-1680元,1650元的报价较少,1680元报价的厂家数量在三分之一以下。
- 推荐网络例句
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Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".
歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车,和一双合并为一移交&整个lotta爱&。
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This is Kate, and that's Erin.
这是凯特,那个是爱朗。
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Articulate the aims, objectives and key aspects of a strategic business plan.
明确的宗旨,目标和重点战略业务计划。