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Dealcoholization temperature markedly influences the surface area and porosity of the resultant MAO-supports. When the support was pretreated at lower or higher temperature, the corresponding MAO-support shows very low surface area; 2.XRD and IR analyses indicate that MAO has reacted with the residual ethanol in the supports, which is an important manner to get MAO fixed on the carrier. Morever, XPS analyse indicates that MAO can also be coordinated with MgCl_2, which is another way to get MAO fixed on the support; 3.ICP and EDX analyses indicate that dealcoholization temperature not only determined the element content on the solid catalyst, but also influences the element distribution on the carrier; 4.The activities of the supported phenoxy-imine catalysts and the properties of resultant polymers are strongly dependent on the dealcoholization temperature. The support (MSP-5) obtained by treating MgCl_2·2.56C_2H_5OH at 160℃for 4 h, then modified by MAO is very effective for immobilizing complex 3, the resultant solid catalyst (MSPC-5) shows very high activity in ethylene polymerization, and its kinetics of polymerization is stable during the reaction process. Finally, PEs with spherical morphology and high bulk density (over 0.35g/ml) were obtained, without reactor fouling; 5.In this work, polymerization conditions such as alkylaluminums, Al/Zr ratio, temperature and H_2 had a pronounced effect on the activity of MSPC-5 and properties of PE;(3). New MgCl_2-Supported Single-Site Catalysts for Ethylene Polymerization In this work, a kind of new MgCl_2 support was obtained by anhydrous MgCl_2 co-milled with solid MAO, and it is a creative contribution. Then some single-site catalysts were supported on the new MgCl_2 support, and the resulted solid catalysts were tested in ethylene polymerization, the results indicated that: 1.XRD and IR analyses indicate that MAO does be coordinated with MgCl_2, which is in good agreement with the results obtained by XPS; 2.co-mlling time had no obvious effect on the texture of support after 12 hours; 3.In this work, MgCl_2 was co-milled with solid MAO for different hours, and then complex 3 was supported on these co-milled supports. It was found that co-milling time markedly influences the activity of solid catalysts, but it had negligible effect on the kinetic profile and the properties of resultant PE.
XPS研究结果表明,MAO不仅仅只和乙醇作用,MAO还与MgCl_2本身有一定的作用,这是一个极为重要的发现; 3、通过ICP和EDX表征,发现载体的脱醇温度直接影响着元素在固体催化剂中的含量及分布; 4、脱醇温度极大地影响着负载苯氧基亚胺类催化剂的活性和聚合物的性能,特别是原始载体经160℃活化4小时制备得到的固体催化剂MSPC-5的活性明显高于其他脱醇温度条件下制得的固体催化,并且催化剂寿命长,表现出稳定的动力学行为,最终获得了高堆密度(大于0.35g/ml)的球形聚乙烯颗粒; 5、本文选择MSPC-5为研究对象,考察了聚合反应参数对催化剂的活性及其聚合物的影响,研究发现:不同的烷基铝对催化剂具有非常重要的影响,特别足TIBA对MSPC-5的助催化活性最高,烷基铝的加入量有一个较佳值,聚合温度为80度时活性最高,H_2的加入使催化剂的活性明显降低且聚合物的分子量也减小;、新型氯化镁载体负载单活性中心催化剂催化乙烯聚合本文创造性采用固体MAO与无水氯化镁直接进行共研磨,制备出了一种的新型的氯化镁载体,并将该载体用于多种单活性中心催化剂的负载化研究,研究表明: 1、通过BET、XRD的表征,再次证实了MAO与MgCl_2之间具有直接作用,与XPS的研究结果相一致; 2、当研磨时间高于12小时时,延长研磨时间对载体的结构没有显著的影响; 3、将配合物3负载于共研磨时间不同的一系列载体上,乙烯聚合结果表明,尽管共研磨时间对负载催化剂的活性具有明显的影响,但是它对聚合物的性能以及催化剂的影响不明显。
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Two groups of patients both obtain diammonium glycyrrhizinate, vitamin c, inosine, maintenance treatment of water electrolyte balance.treatment group decoct soup daily on the basic treatment of western medicine, the control group use potassium-magnesium aspartate injection.results in the treatment group 17 cases are markedly effective, 9 cases are effective, 4 cases are invalid;in control group, 8 cases are markedly effective, 9 cases are effective, 11 cases are invalid.
两组患者均予甘利欣、维生素c、肌苷、维持水电解质平衡治疗。治疗组在西医基础治疗上每日煎服自拟的凉血活血退黄汤,对照组采用门冬氨酸钾镁注射液。结果治疗组显效17例,有效9例,无效4例;对照组显效8例,有效9例,无效11例。两组比较差异有统计学意义。
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Suppressalis only at low instars markedly, but effect of the three diets on survival and sex ratio was rather notable; and length of the adult varied markedly.
以浙江省 3种主栽水稻品种浙辐 910、杂交稻(Ⅱ优 3027)、秀水 11的稻苗为供试食料喂饲二化螟,研究了 3种食料对二化螟生长发育和产卵量的影响。
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The influence of recessing in adh es ive layer with high elastic modulus on the peak stress of joint is not evident so that it would improve the actual strength of joint markedly based on the load bearing ability not being affected evidenly . On the other hand , the recessing in the joint with low elastic modulus adh es ive caus es the peak stress es increase evidently that may decrease the nominal and actual strength of the joint markedly .
对胶层和被粘物中应力分布的数值分析结果表明:胶层中的间隙对接头端部的应力分布无明显影响,但对间隙附近的应力峰值影响较大;随着胶粘剂弹性模量的增大,间隙附近的应力峰值有所降低;对于高弹性模量胶粘剂接头,胶层中的间隙对接头的应力峰值无明显影响,在不降低接头名义强度的同时可使得接头的实际强度显著提高;而对于低弹性模量胶粘剂接头,间隙使得接头上的应力峰值明显上升,可能导致接头的名义强度和实际强度显著降低。
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Results:After absolute alcohol treatment for 173 cysts in 118 casescure rate 87.28%markedly effective rate 96.53%effective rate 99.42%.
结果:118例共173个肾囊肿经无水酒精治疗后复查发现总治愈率为87.28%,总显效率为96.53%,总有效率为99.42%。
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Results:After absolute alcohol treatment for 173 cysts in 118 cases,cure rate 87.28%,markedly effective rate 96.53%,effective rate 99.42%.
结果:118例共173个肾囊肿经无水酒精治疗后复查发现总治愈率为87.28%,总显效率为96.53%,总有效率为99.42%。
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The main conclusions of this chapter are the following: There is no absolute regional convergence since 1978, even the period were divided into two stage: 1978-1991 and 1992-2002; There exists absolute convergence among the provinces in eastern region in the period 1978-1991, the phenomena is alike to the central and western regions, so the club convergence is the fact of the regional economic growth in this stage; From 1992 to 2002, instead of the club convergence, there exists conditional convergence, human capital, capital investment, international trade and FDI influenced the regional economic growth rate markedly; The distribution of income across provinces don't transform from a unimodal into a bimodal distribution.
本章的基本结论是:改革开放以来不存在绝对收敛,即使将整个改革时期划分为1978—1991年和1992—2002年两个区间也是如此;1978—1991年期间,东部地区和中西部地区内部各自存在人均GDP和劳均GDP增长的收敛,从而形成了俱乐部收敛;1992年之后,并不存在俱乐部收敛,但存在一定的条件收敛,人力资本、物质资本投资、国际贸易和FDI对劳均GDP增长有着重要的正向影响;收入分布并没有发生由单峰向双峰分布的转变,总体上单峰的态势依然十分明显。
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The experiment results show that A1998 can markedly enhance the acquirement, strengthening and reappearance of memory.
以上实验结果表明,A1998对脑记忆的获得、巩固和再现均表现出明显的增强作用。
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Results:The gastrointestinal motility of rats was markedly enhanced in Ageratum - liquid group.
藿香正气液有促胃肠动力作用,该作用可能不是其组方药物作用的简单相加。
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Water law and air law reflect the changes of environmental law in history markedly.
同时,本文还根据环境中的共性问题对环境和环境法的内涵作了完善,将人类作为环境的组成部分。
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When this condition occurs, inbound replication with the source partner is stopped on the destination domain controller and event ID 2042 is logged in the Directory Services event log.
计算机密码学是研究计算机信息加密、解密及其变换的科学,是数学和计算机的交义学科,也是一门新兴的学科。
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Instructions: click on the thumbnails to see a larger image, then use the left-right arrow keys to scroll through the slideshow.
使用说明:滑鼠点在小图上即可放大观赏。开启后键盘左右键可用来换照片。
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I can see it fastened to a nail next to the hole in the wall, but it is not fastened to that wire.
福尔摩斯说,我看到绳子是系在墙洞旁边的钉子上,而不是系在那根金属丝上。