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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 components were calculated with normalization method and compared with the references. Result: 68 compounds have been identified; comparing with the water decoction, the amount of fatty acids was decreased while the amount of terpenes was increased; at the mean while, carene and pinene which were abundant in single herb were not detected.
结果:从YL2000醇提制剂中初步分离鉴定了68个成分;同水煎剂相比,醇提制剂提高了挥发油的得率,去除了大量脂肪酸类成分,但保留了水煎剂中的88%的萜类成分,并将其含量提高了约6倍;同单味药材相比,醇提制剂和水煎剂均富集了萜类成分而大大降低了蒎烯和蒈烯类成分的含量。
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The paper obtains some conclusions after many theories analysis and empirical tests: Firstly, Volume-price relativity is extensive: total volume or it's change, disassembled volume promoting price movement or it's change all has plus relativity to equilibria price. Secondly, there is unilateralisms Granger casuality in bullmarket, while there is bidirectional Granger casuality in bearmarket. There is not nonlinear Granger casuality in both markets. Third, Behavior finance has remarkable effects after contrasting to different investment conditions. Moreover, causality research by moving tendency can reflect the stable relation while usual causality research can't do. Fourth, it can be ture forecasing key period of tendency reversion by building volume-price elasticity coefficient containing composite information of volume-price and analysis methods of moving tendency.
本文大量的理论分析和实证研究得到以下结果:第一,量价之间的相关性具有广泛性,总成交量及变化、分解的促进股价变化的成交量及变化都与均衡价格收益有正相关关系;第二,在牛市中,收益和成交量之间存在单向的Granger因果关系,而在熊市中,收益和成交量之间存在双向的Granger因果关系,不论熊市和牛市,上证和深证量价间均没有非线性因果关系;第三,不同市场环境的比较中还发现行为金融在股市中的作用明显,通过比较发现依据运行趋势的因果关系分析能反映量价间的稳定关系,而常规因果分析方法却反映不出来;第四,通过建立包含量价信息的量价弹性系数指标和依据运行趋势的关键区域研究法,可以实现对趋势转变关键区域的预测。
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While the control group had a horizontal curve which had micro changes. To compared with control group, the serum hepcidin contents had a tendency like a cavate parabola which had the lowest on 8th、9th、10th day, the same to the hepatic hepcidin gene expression changes. While control group had the same changes of gene expression .
血清铁调素ELISA检测含量趋势与对照组比较,呈现凹陷的抛物线变化,低值出现在第8、9、10天,整体变化趋势与肝脏基因水平相符合;对照组变化亦与肝脏hepcidin基因水平相符合。
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The cases in control group were given 0.3g aspirin for chawing, 5000u low molecular weight haperins were injected abdominally once for 12 hours total for 10 days one course. in the morning they took 0.1g aspirin and 75mg clopidogrel bisulfate, in the mean while, simvastatin betaloc, captopril and nitrogly cerin were used. while the cases in treatment group were pumped intravenous of 0.4ug/kg.min hydrochloride tirofiban sodium at the first 30 minutes, then as 01ug/kg.min for 24 hours on the basis treatment of the control group.
对照组以阿司匹林0.3 嚼碎顿服,低分子肝素5000u,腹壁皮下注射12h1次,共10d,阿司匹林0.1晨服,波立维75mg晨服,及应用辛伐他汀、倍他乐克、卡托普利、硝酸甘油等治疗;治疗组在此基础上应用盐酸替罗非班氯化钠注射液,前30min以0.4ug/kg/min负荷输入,后以0.1ug/kg/min静脉泵输入维持24h;观察两组疗效。
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Results As compared to DM control group, levels of GSP, myocardial enzymes and myocardial Ang Ⅱ were much lower in APS group, while levels of insulin, C-peptide and plasma Ang Ⅱ were the same. Levels of expression of collagen Ⅰ and the ratio of collagen Ⅰ/collagen Ⅲ in APS group were lower than those in DM group. APS group showed lower levels of chymase mRNA expression and activity than those in DM control group, while there was no diference in ACE mRNA expression and activity between the two groups.
结果 APS组血糖、糖化血清蛋白、心肌酶谱和心肌Ang Ⅱ水平较DM组显著下降,胰岛素、C肽、血浆AngⅡ水平和DM组无差异;APS组心肌Ⅰ型胶原表达和Ⅰ/Ⅲ型胶原比值较DM组显著下降;APS组chymase mRNA表达和活性均显著低于DM组,ACE基因的表达和活性与DM组无显著性差异。
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While levels of insulin. C-peptide and plasma Ang Ⅱ were similar. APS group showed lower levels of chymase mRNA expression and activity than those of DM control group, while there was no diference in ACE mRNA expression and activity between two groups. Compared with DM group, expression level of p-ERK1/2 in APS group was much lower.
结果:APS治疗组GSP、心肌酶谱和心肌AngⅡ水平较对照组显著下降;血胰岛素、C肽、血浆AngⅡ水平与对照组无显著差异;APS组chymase mRNA表达和活性均显著低于对照组,ACE基因的表达和活性与对照组无显著差异;APS组心肌p-ERK1/2含量较对照组明显降低。
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While players such as his clubmate Neville seem to be heading towards retirement consumed by rage that soon it will all be over, Giggs has carried the look of a man who seems intent on enjoying it while he can.
当他俱乐部基伴尼维利在被伤病折磨的看起来已离退役时日无多的时候,杰斯的感觉就像他想尽可能的在他还能的时候享受这一切。
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While in Ass.haloxy persicum-H.ammodendron communities, either Haloxylon ammodendron population or Haloxylon persicum population, the spatial pattern was also congregative in 0~50m scales.While sometimes there was a transition from congregative pattern to regular pattern between them. There was a negative or positive, no relation and negative relation change series between Haloxylon ammodendron and Haloxylon persicum. In Ass.
梭梭-白梭梭群落的梭梭种群和白梭梭种群的空间格局比较复杂,但在所研究的尺度(0~50m)上,种群空间格局呈聚集分布或由聚集分布向均匀分布转变;梭梭与白梭梭的种间关系在空间上呈负相关或正相关、不相关和负相关变化序列。
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From the point of education notion, the former puts more emphasis on the mastery of basic skills while the latter encourage scientific innovation spirit. As for the subjects, the former is oriented to all students, devoting to students' comprehensive development and their education for life. On the contract, the latter prepares students to be qualified university applicants. Regarding assessment, both believe that fairness and comprehensiveness are important. Additionally, assessment reacts on teaching and multi-assessment is preferred. Contrastingly, the former lays more stress on result-oriented paper exams while the latter also takes daily teaching process into consideration when it comes to assessment.
从理念上看,二者均注重学生能力的培养,前者更强调基本技能的掌握,后者更鼓励科学创新精神;从对象上看,前者面向全体学生,着眼于学生全面发展和终身发展需要的大众教育,后者的定位则是精英教育,使学生成为最有资格的大学申请者;从评价上看,二者均强调客观公正全面的评价、通过评价对教学过程做出指导,在提倡多元化评价的同时,前者更注重充分利用好传统的纸笔测验的评价方式的终结性评价,后者除终结性评价外也注重贯穿在日常课堂教学中的内部评价。
- 相关中文对照歌词
- Love Handles
- Little Eye
- Lay A While
- Dream While You Can
- Get It While It's Hot
- Long While (Demo)
- A Little While
- Diggin' Your Style
- Cigarettes, Wedding Bands
- Pay Attention
- 推荐网络例句
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Now he worked in ajoint venture.
现在他在一家合资企业工作。
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More troops in Afghanistan won't change any of the foregoing.
更多的在阿富汗的军队也不会改变之前的状况。
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Your love which knows not fulfilment is dear to my heart.
你的永不满足的爱,对我的心是亲切的。