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Because of recent research in our laboratory on carbodiimide chemistry and isocyanate prepolymer synthesis, we have found a versatile facile approach of making macro-ring compounds.
由於本实验室近年来致力於碳二亚胺化学及合成异氰酸盐预聚物之研究,由延伸其领域而发现快速又简易的方法可制备反应型巨环状高分子中间体。
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The effect of zeolites ion-exchanged by transition metals on thermal catalytic cracking reaction is studied. The product distributions of the cracking reactions catalyzed by theβor ZSM-5 zeolites exchanged with transition metals are different from that catalyzed by corresponding Hzeolites, which means the mechanism of cracking reactions has varied. Group Ⅷ metals Fe, Co, Ni and Cu, Zn are shown to be of strong catalytic activity of oxidative dehydrogenation, while Ti and Cr are not of oxidative activity. Catalyzed by zeolites or catalyst containing Ag, conversion of thermal catalytic cracking reactions and the yield of ethylene increase while the yield of propylene does not decrease. Silver can not only promote the formation of carbonium ion, but also convert carbonium ion into free-radical via redox reaction. The weak adsorption of olefins on silver reduces the occurrence of hydrogen transfer and dehydrogenation. As a result, the yield of light olefins is favored by silver in the catalyst.
采用过渡金属交换的分子筛作为催化剂,进行催化热裂解制取乙烯的反应,研究发现,在β沸石分子筛和ZSM-5分子筛中引入过渡金属后,催化热裂解反应的产物分布与相应的氢型分子筛相比有了较大的变化,说明过渡金属的加入对于催化热裂解反应的机理具有影响,Ⅷ族金属如Fe、Co、Ni和第Ⅰ、Ⅱ副族Cu、Zn表现出较强的氧化脱氢活性,产物中氢气、焦炭的产率很高,Ti、Cr则未表现出氧化作用:分子筛及催化剂中引入银后,催化热裂解反应的转化率和乙烯的产率有了提高,丙烯产率没有很大的变化,说明银在催化热裂解反应中能够促进正碳离子的生成,又有可能通过氧化-还原作用部分改变反应机理,促进了自由基的生成,并且由于银对烯烃的吸附很弱,其氢转移反应和脱氢、加氢活性比较低,有利于烯烃产率的提高。
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The company identifies, evaluates and executes real estate transactions for CarVal Investors, a global investment company and other large institutional investors (such as Citigroup, Secured Capital Japan and DEGI) and provides asset management services to those investors.
凯龙的公司核心领导团队既具有在美国、西欧及日本市场的广泛国际投资知识和资金运作经验,又具有对中国地产知识的深刻了解。
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The results showed that the Shannon-weaver index of genetic diversity ranged from 1.3647 to 2.9964 and the Simpson index from 0.6111 to 0.9326, which indicated that the Cerasus has abundant genetic diversity.
同时在两大类内又将品种进行细分,第Ⅰ类分为3组,第Ⅱ类分为2组,其结果与地理分布有一定的相关性,能够反映樱桃的遗传特点及区域特性。
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Meanwhile, after the adjustment of the Japanese government's ODA to china in recent years , the changement of Sino Japan relationship and the running of relations between Japan and China fortunes have been analyzed short and sweet.
这次调整在很大程度上反映了日本在新世纪的战略调整及外交方向,随着日本ODA政策的调整,日本对华ODA的作用也发生了变化,成为一柄既促进两国交往与合作,又防范与限制中国发展的&双刃剑&。
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You talk of choiceless awareness, which again breeds another battle in me, for I am full of choice, decisions and opinions.
你还谈到毫无选择地觉察,这又滋生了我内心的另一种冲突,因为我的心中充满了选择、决断及观点。
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The biomarkers such as the n-Alkanes, the isoprenoids, the terpane, and cholestane were detected through GC-MS analysis. Based on the study of the biomarkers, the biological evolution during Permian and Triassic can be divided as three stages, namely, the mixing source stage of low biota such as thallose and advanced plant in late Permian (below bed 63), the stage of low biota such as thallose in the boundary transitional layer (bed 63-69) and the mixing source stage of advanced plant and low biota such as thallose in early Triassic (above bed 69). What's more, the second stage near the boundary transitional layer can be subdivided into 4 stages. The stages of biota evolution is close related with sedimentary environment changing and the boundary transitional layer.
利用GC—MS分析技术,在陆相地层中检测出正构烷烃、类异戊二烯烷烃、萜烷和甾烷类生物标志化合物并根据生物标志化合物和特征值研究,将二叠系—三叠系生物演化划分为三个大的阶段,即晚二叠世的菌藻类低等生物与高等植物混源阶段(63层以下),界线异常层的菌藻类低等生物阶段(63-69层)和早三叠世高等植物与菌藻类低等生物混源阶段(69层以上),界线附近异常层的第二阶段又进一步细分为4个次一级阶段,生物演化阶段与沉积环境变化及界线异常层具有非常密切关系。
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Field investigation and analyses of the grain size, geochemical, stable carbon isotope etc climate proxies all indicate that this region, in about 14000aBP, u nderwent the expansion of the swamp. Subsequently, the swamp, because of aridity , began to decrease in area, and even disappeared. This process was followed by an immediate flooding period. The region, after the Younger Dryas cooling event (108000~10200aBP), came into the warming period of the Holocene, and then clima te in the region fluctuated subsequently.
张强通过区域地貌调查及对南京浦镇林峰桥剖面沉积物进行粒度、地球化学和稳定碳同位素等环境替代指标的分析研究,结果表明:本区在14000aBP左右先后经历了沼泽扩张期,此后气候变干,沼泽开始退缩,直至消失,在经过了长时间的沉积间断后又经历一次洪水泛滥期。
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Herodium was a lavish residence that served as King Herod's summer palace, a sumptuous villa with opulent apartments furnished for the royal family and their guests. It boasted a Roman bath with hot and cold pools, surrounded by colonnaded gardens.
希律堡是希律王昂贵铺张的夏宫,在那奢华的别墅中,有许多预备给皇室及贵客的上等房间,其中又以位於柱廊环绕的庭园、冷热池兼具的罗马浴为最闻名。
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This thesis combined life science and biotechnology with management and economics, theories research with positive analysis, experience research, strategy design and implementary measures, academic result with industry practice which not only shows certain academic innovation,but also puts forward and establishes related categories, theories and models. It also put forward the countermeasures to promote the competitory power of Chinese bio-industry based on the substantial analysis of the development and the competitory power of bio-industry in the world and in China.
本论文将生命科学、生物技术与管理学、经济学交叉融合,理论研究与实证分析、经验研究、战略设计、实施措施相配合,学术成果与产业化实践相沟通,既体现了一定的学术创新度和超前性,又提出和创建了相关范畴、理论、模型,并进行了全球主要国家和中国的生物产业发展和竞争力实证分析,以此为基础,提出了提升中国生物产业竞争力的建设性战略及实施决策建议。
- 推荐网络例句
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This one mode pays close attention to network credence foundation of the businessman very much.
这一模式非常关注商人的网络信用基础。
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Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.
扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。
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There is no differences of cell proliferation vitality between labeled and unlabeled NSCs.
双标记神经干细胞的增殖、分化活力与未标记神经干细胞相比无改变。