在中心

In the respect of plant geography, combining with the situation that plaeogeography, fossils of cycads, present the diversity of cycads of China and the evolutionary process of cycads, think that southwestern region of China are distribution center of plants of Cycadaceae and the originated center.

在地理分布方面，结合古地理、古苏铁植物化石的情况及现代中国苏铁科植物的多样性及苏铁科植物的演化过程等方面分析，认为中国的西南地区为苏铁科植物的分布中心，也是起源中心。

In the rice leaves infected by RDV Yunnan isolate, the distribution of cells full of virus particles formed a belt which was a center of infection and multiplication of virus, around the cells fall of virus particles were some cells with the different extent of lesion as follows: disappearance of membrane system of chloroplasts, there were virus particles in some chloroplasts, and some sine or assembled virions in the mitochodria or cytoplasma but not in nuclei ,and intact subcellular structure in the cell far away from the infected center; In the rice leaves cell infected by Zhejiang isolate, some cells were full of virions, but the distribution of cells didn't form the belt, other cytopathological characters were similar to the cells infected by Yunnan isolate.

RDV云南分离株浸染的水稻叶片中，充满病毒粒体的细胞呈条带状分布，呈现出明显的侵染和增殖中心，在充满病毒粒体的细胞周围，相邻细胞有不同程度的病变，叶绿体膜系统消失，部分叶绿体中含有病毒颖粒，线粒体残体及细胞质中有分散或聚集的病毒粒体，细胞核中未见病毒粒体，离侵染中心较远的细胞中亚细胞结构较完整；RDV浙江分离株侵染的水稻叶片中，部分细胞充满病毒粒体，无明显的条带状分布，其他细胞病理特征与RDV云南分离株侵染的水稻叶片相似。

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 PolymerizationIn 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。

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。

The average tilt of IOL in PMMA group is 2.57±1.34° in 8 weeks after surgery, and the average decentration of IOL is 0.41±0.18mm; the average tilt of IOL in silicon group is 4.25±2.37° in 8 weeks after surgery, and the average decentration of IOL is 0.72±1.04mm.

PMMA人工水晶体组在术后八周时平均倾斜度为2.57±1.34°，平均中心移位0.41±0.18mm；Silicone组则平约倾斜度为4.25±2.37°，平均中心移位为0.72±1.04mm。

But the influence of interface dip is relatively small and can be omitted. A considerable declinational departure of the ellipse's center from the reflection point may be caused by the reflector's dip, and the deflection grows rapidly with the dip increasing.

界面倾角对椭圆大小和形状的影响相对微小可以忽略不计，但界面倾角却是影响椭圆中心位置偏离反射点程度的主要因素，倾角越大，椭圆中心在反射点下倾方向上偏离得越远。

This is Xia Deren of Dalian city mayor 8 days in Dalian new and high area is in charge of appoint collaboration of limited company of development of Yuguang science and technology of meeting, Shanghai builds computer of Yu Guangquan ball safeguard central signing ceremony remotely to go up denotive, this center is a computer that is based on fictitious network technology and technology of light-duty and fictitious machine maintains a project remotely, fill the blank that our country maintains the market and network system application remotely what be a foundation with fictitious technology.

这是大连市市长夏德仁8日在大连高新区管委会、上海宇光科技发展有限公司合作建立宇光全球计算机远程维护中心签字仪式上表示的，该中心是一个基于虚拟网络技术和轻型虚拟机技术的计算机远程维护项目，填补了我国以虚拟技术为基础的远程维护市场及网络系统应用的空白。

4Northwest,southwest and Nanling mountains ect are the distribution centers of Elaeocarpaceae in Hunan;Hunan is the transitive region of Elaeocarpaceae, spreding and differentiating from southwest of China toward east, north and northeast.

杜英科在湖南以湘西北、湘西南、南岭山地等植物区为其分布中心；同时，湖南也是以中国西南部为中心杜英科向北、向东、向东北扩散并分化的过渡地区。

The study shows that: evergreen broad-leaved species during the middle and later period succession have better adaptability under the different light surroundings, such as Elaeocarpus glabripetalus, Ilex integra, Photinia prunifolia, Cinnamommum camphora. And Fluorescent Characteristics also verifies the above result. The experiment results indicate that: PSⅡreaction centers of majority tree species are not marked oxidized under the full light surroundings. Photosynthetic electron transport activity can maintain highly, in this way, it is helpful to enhance radiant energy dissipation and thus dissipate excess light energy. That is to say, the increase of non-photochemical quenching coefficient can conduce to protect PSⅡ, and mitigate the effect of high light on photosynthesis.

研究发现处于演替中后期的常绿阔叶树种幼苗，对光环境的变化均有着较强的适应能力，秃瓣杜英、全缘冬青、小叶铁冬青、桃叶石楠、香樟等树种的表现尤为突出；荧光特性的研究也应证了这一观点，测定结果表明多数树种的PSⅡ反应中心并未受到明显氧化破坏，在全光照条件下仍能维持较高的光合电子传递活性，能通过提高非辐射性热耗散，消耗PSⅡ吸收的过剩的光能，从而保护PSⅡ反应中心免受因吸收过多光能而引起的光氧化伤害。

Tianjin, one of the four municipalities directly under the Central Government, is the door of Beijing, capital of China. In 1997, the State Council described her as the economic center of the Bohai-Sea-Ring area, as well as an important economic center of northern China. This function description has the following meanings: on the one hand, the development of Tianjin must eradiate the Bohai-Sea-Ring area, the north of China and even the whole nation; on the other hand, it requests Tianjin to step up to a higher position, function and influence in multinational regional cooperation, and hence to form an important base and green channel on economy cooperation in northern China.

天津作为中国四大直辖市之一，是首都北京的门户。1997年国务院将其定位为环渤海的经济中心和我国北方重要的经济中心，这一功能定位意味着：一方面要求天津的发展要辐射于环渤海地区，辐射于我国北方地区乃至辐射于全国；另一方面要求提升天津在跨国区域合作中的地位、作用和影响，形成中国北方对外经济合作的重要基地和绿色通道。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。