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研究結(jié)果表明99九九精品免费视频观看，MAO不僅僅只和乙醇作用，MAO還與MgCl_2本身有一定的作用91亚洲精品视频，這是一個(gè)極為重要的發(fā)現(xiàn)3yz14.com； 3、通過ICP和EDX表征久久综合久久艹，發(fā)現(xiàn)載體的脫醇溫度直接影響著元素在固體催化劑中的含量及分布操人在线网站； 4、脫醇溫度極大地影響著負(fù)載苯氧基亞胺類催化劑的活性和聚合物的性能日韩变态福利网站在线观看，特別是原始載體經(jīng)160℃活化4小時(shí)制備得到的固體催化劑MSPC-5的活性明顯高于其他脫醇溫度條件下制得的固體催化亚洲操在线观看，并且催化劑壽命長(zhǎng)，表現(xiàn)出穩(wěn)定的動(dòng)力學(xué)行為十八岁禁看网站，最終獲得了高堆密度(大于0.35g／ml)的球形聚乙烯顆粒免费看A片网站在线播放； 5、本文選擇MSPC-5為研究對(duì)象欧美精品人爱A欧美精品，考察了聚合反應(yīng)參數(shù)對(duì)催化劑的活性及其聚合物的影響538在线在视频在线，研究發(fā)現(xiàn)：不同的烷基鋁對(duì)催化劑具有非常重要的影響，特別足TIBA對(duì)MSPC-5的助催化活性最高黄色视频制服网站，烷基鋁的加入量有一個(gè)較佳值欧美日韩国产精品，聚合溫度為80度時(shí)活性最高，H_2的加入使催化劑的活性明顯降低且聚合物的分子量也減信访繟片一区二区三区∪蘸患短丶妒悠担弧⑿滦吐然V載體負(fù)載單活性中心催化劑催化乙烯聚合本文創(chuàng)造性采用固體MAO與無水氯化鎂直接進(jìn)行共研磨igao网变成什么网站了，制備出了一種的新型的氯化鎂載體欧美精选三区，并將該載體用于多種單活性中心催化劑的負(fù)載化研究，研究表明： 1A片ⅴ7v.C、通過BETgzdaqm.com、XRD的表征，再次證實(shí)了MAO與MgCl_2之間具有直接作用人人添人人澡人人澡人人人爽，與XPS的研究結(jié)果相一致欧美精品三区； 2、當(dāng)研磨時(shí)間高于12小時(shí)時(shí)欧美强奸乱码中文字幕，延長(zhǎng)研磨時(shí)間對(duì)載體的結(jié)構(gòu)沒有顯著的影響看黄网站网址免费； 3、將配合物3負(fù)載于共研磨時(shí)間不同的一系列載體上，乙烯聚合結(jié)果表明亚洲一区二区三区羽田爱，盡管共研磨時(shí)間對(duì)負(fù)載催化劑的活性具有明顯的影響美国一级黄片的黄色美国的现在能放出来的，但是它對(duì)聚合物的性能以及催化劑的影響不明顯。

The result shows that the Giant Panda habitat in Gansu is an under-plant population of forest communities with Fargesia denudate as the dominant species; that Giant Panda make movements at the altitudes ranging from 1 600 m to 2 000 m in Wenxian County and Diebu County; that the characteristics of bamboo population, geographical environment, along with the integrity of forest communities, are taken as the three dominant factors in influencing the life of Giant Panda;and that the features of the habitat are basically stable but reasonable distribution together with strong artificial disturbance is considered as the potential factor resulting in the habitat unstable.

結(jié)果表明：甘肅省大熊貓主要棲息在以缺苞箭竹為優(yōu)勢(shì)的下木種群森林群落中狠狠色视频一区二区，其垂直活動(dòng)范圍主要集中在海拔1 600～2 800 m處一级黄色视频免费下载观看真人视频，水平分布在文縣和迭部一帶；竹類種群的特性最新国内偷拍精彩视频、地理環(huán)境和森林群落的完整性是大熊貓棲息生存的3個(gè)主要綜合要素黄片一级午夜福；甘肅省大熊貓的生境特征基本穩(wěn)定，但該區(qū)竹類種群的正態(tài)性分布和人為干擾強(qiáng)度是構(gòu)成其生境不穩(wěn)定的重要潛在因素麻豆AV在线高清免费播放。

The results show that weight average molecular, molecular weight distribution and the dissociative sulfate content of 916 do not change obviously. It shows that 916 is stable by lysozyme and trypsin...

結(jié)果表明：在所選定的實(shí)驗(yàn)條件下亚洲区综合，916的重均分子量欧美一区、二区、分子量分布系數(shù)和游離硫酸根含量均未發(fā)生顯著變化黄色网页在线免费看。，表明在所選擇的實(shí)驗(yàn)條件下 916對(duì)溶菌酶和胰蛋白酶是穩(wěn)定的。

The results showed that MGM had good spherical shape and narrow size distribution,and the particles with diameters ranging from 0.13 mm to 0.28 mm were about 91 wt%.The surface hydrophilicity of Fe3O4 microcrystal was improved by formamide dispersing treatment.The gel particles made by the copolymerization of glycidyl methacrylate and N,N′-methylene bisacrylamide could encapsule Fe3O4 microcrystal to produce colloid cores,and uniform and stable MGM microspheres were formed by the conglomeration of the colloid cores.

結(jié)果表明国产精品婷婷久久久久久，合成的MGM呈球形WWWaⅤ，且粒度分布較窄，粒徑為0.13～0.28 mm的粒子占91%日韩精品美女网页在线观看免费；甲酰胺分散Fe3O499久久久精品免费人妖，微晶表面的親水性進(jìn)一步增強(qiáng)，單體甲基丙烯酸縮水甘油酯和 NAV网站在线观看不卡无码，N′亞甲基雙丙烯酰胺交聯(lián)共聚生成的膠粒能夠包埋Fe3O4微晶形成膠核aaa日欧美女，膠核聚集形成均勻、穩(wěn)定的MGM微球欧美丰满大乳乳液在线观看视频。

The distribution of N-P and the moisture variation caused by incrassation of the mattic epipedon together with its relationship to pasture degradation by grazing in alpine Kobresia meadow were studied at the Haibei ecosystem research station, Chinese Academy of Sciences. From 2005 to 2007, the plot pasture was maintained with a relatively stable grazing intensity and had formed obvious differences in surface character and species component.

在中國科學(xué)院海北高寒草甸生態(tài)系統(tǒng)研究站地區(qū)日本ā片免费观看网站，選擇了5個(gè)自然放牧梯度、處于4種典型退化階段的高寒嵩草草甸為研究對(duì)象免费观看18禁无遮挡真人免费，進(jìn)行了土壤草氈表層加厚引起的系統(tǒng)氮精品欧美一区二区不卡视频、磷分配和水分利用的變化過程研究。

The stable or unstable state of the montmorillonite-water dispersion is mainly effected by the properties of montmorillonite, water, and stabilizers as well as their interactions, while the type, the structure, the properties and the concentration of the stabilizer play dominate roles. Based on the molecular designing clues, this research selected three sulfonated copolymers as the stabilizers, i.e. the sodium 2-acrylamido-2-methyl-1propane sulfonate /acrylamide /disodium itaconate terpolymer, the AMPS/AM/N-vinyl pyrrolidone terpolymer and the sodium styrenesulfonate /IA copolymer. The preparation and characterization of the sulfonated copolymers were discussed, the high-temperature stability of the montmorillonitewater dispersion was characterized with the rheology, the filtration, the particle size distribution, the electrostatic properties, and the adorption of the sulfonated copolymers onto montmorillonite particles. At the same time, a systematic mechanism of the hightemperature stabilization of the dispersion was presented.

本文構(gòu)筑了分子設(shè)計(jì)的思路www.毛片段子免费，選取AMPS(2-丙烯酰胺基-2-甲基丙磺酸鈉)/AM/IA三元共聚物国产qv、AMPS/AM/NVP三元共聚物和SSA/IA二元共聚物等三種磺化共聚物作為蒙脫土-水分散體系的高溫穩(wěn)定劑，進(jìn)行了磺化共聚物穩(wěn)定劑的制備與表征视频偷拍网；從流變學(xué)日韩午夜福利尤物在线观看视频、濾失性能、粒度分布日韩深夜在线、電性質(zhì)以及磺化共聚物在蒙脫土上的吸附作用等方面免费高清一级片，對(duì)蒙脫土-水分散體系的高溫穩(wěn)定性進(jìn)行了研究，考察了蒙脫土-水分散體系的高溫穩(wěn)定性能一級毛片黃色三級片黃色，同時(shí)提出了高溫穩(wěn)定機(jī)理性爱视频国产免费。

The results show three outstanding characters: these two stock markets are closely correlated; the overall day return doesn\'t follow the normal distribution, but it is characterized with leptokurtic and fat tail; the security market return has stable characteristics and multi-fractal characteristics which shown as the long memory, fat tail, scale properties, and variability.

發(fā)現(xiàn)上海和深圳兩個(gè)證券市場(chǎng)的關(guān)聯(lián)程度非常大日韩成人作爱在线视频播放网站；中國證券市場(chǎng)中的總體日收益率分布不服從正態(tài)分布，而是呈&尖峰態(tài)&456欧美视频在线，并且具有&厚尾&的特征羞羞AV漫画在线漫画网免费福利；證券市場(chǎng)收益序列呈現(xiàn)穩(wěn)態(tài)特征與多標(biāo)度分形特性，表現(xiàn)為長(zhǎng)期記憶特性黄色工厂-这里都是精品、厚尾特性嗯啊青草操、標(biāo)度特性和易變性。

The clinical characters of oligodontia concluded from this study are following:(1) There is significant difference that more teeth absent and more existent teeth anomalies in patients of oligodontia/S group than in patients of oligodontia/I group, and the peg-shaped upper lateral incisor is the most frequently affected teeth with shape anomaly.(2) Both of the two groups have no significant differences in number of teeth missing between maxilla and mandible as well as that between left and right side.(3) The distribution of teeth missing is bilateral symmetry in both groups, but the frequency of teeth lost are different: excluding the third molar, in oligodontia/I group, the lower second premolar is the most frequently congenitally missing tooth followed by the upper lateral incisor, while in oligodontia/S group, the most frequently missing teeth are mandibular canine and maxillary lateral incisor. Nevertheless, the first molars are the most stable teeth in both groups.(4) In oligodonita/I group, the mean mesiodistal dimensions of all type of existent teeth are significantly smaller than normal value. It is implied that oligodontia is not an isolated phenomenon, but is related to a complex of other dental changes.

對(duì)于口腔多個(gè)恒牙先天缺失的臨床特點(diǎn)有以下初步結(jié)論：(1)綜合征型先天缺牙患者較單純型先天缺牙患者恒牙缺失數(shù)目更多曰韩一级A片欧美一级A片，平均分別為23.9個(gè)和14.9個(gè)一本在线无码视频免费，且現(xiàn)存牙齒有更多的形態(tài)異常，分別為7／10例（70％）和6／22例（27.3％）亞洲精選精品黃色視頻，其中最常見的是上頜側(cè)切牙畸形99伦乱视频；(2)兩種類型的多個(gè)恒牙先天缺失患者的缺牙數(shù)目在上下頜及左右側(cè)之間均無差別；(3)兩種類型的多個(gè)恒牙先天缺失患者在缺失牙位上均呈對(duì)稱分布911视频黄色，但在具體牙位上有所差異：不計(jì)第三磨牙激情五月丁香婷婷，單純型先天缺牙最常缺失的牙位是下頜第二雙尖牙、其次為上頜側(cè)切牙国產特黃特粗又長A片；而綜合征型先天缺牙最常缺失的牙位是下頜尖牙和上頜側(cè)切牙h片在线观看视频免费播放；無論何種情況，第一磨牙均為牙列中最穩(wěn)定的牙齒男人晚上天堂黄色网站；(4)在單純型先天缺牙患者中97人妻a，現(xiàn)存恒牙的牙冠寬度較國人正常值偏小，差異顯著小草无码免费视频，提示牙齒形態(tài)與多個(gè)牙先天缺失有一定相關(guān)性国产亚洲黄色视频。

Therefore, the distribution of SPAD and photosynthesis rate among leaves of wheat plant was relatively stable, and was hardly affected by nitrogen level.

隨施氮水平的提高，小麥葉片的光合速率呈現(xiàn)出先增加后下降的趨勢(shì)韩av.com，施氮量為135kg／ha時(shí)光合速率最高自拍偷拍欧美综合。

The result indicated that we can get stable homopolymer and copolymer emulsion with uniform size distribution, when the ratio of sodium polyether sulfovinate modified polysiloxane to sodium lauryl sulfate was two, the quantity of the emulsifiers ranged from 6% to 8%, the quantity of initiator ranged from 0.4% to 0.8%, the stirring speed ranged from 200rpm to 250rpm, the polymerization temperature was 80 centigrade degree. As for the copolymer emulsion, the more the TRIS content in the monomers, the larger the water contact angle of their films became, namely, the surface energy of the copolymer films increased with the TRIS content in the monomers. In addition, the glass-transition temperature of the copolymers ranged from high temperature region to low temperature region with the increasing of TRIS content in the monomers.

結(jié)果表明：當(dāng)乳化劑用量在6%～8%、改性乳化劑與十二烷基硫酸鈉復(fù)配比為2：13344300部、引發(fā)劑用量在0.4～0.8%婷婷综合一区、聚合溫度為80℃、攪拌速度在200～250rpm時(shí)麻豆国产精品，得到的均聚物和共聚物乳液穩(wěn)定色妞一二三区在线观看，而且粒徑分布均勻；對(duì)于共聚物乳液來說欧美A日韩A，隨著單體中TRIS含量的增加日韩毛片无码一区二区，所得聚合物膜的水滴接觸角增加，即其表面能增加：另外，隨著共聚單體中TRIS含量的增加久久久久国产精品视频，共聚物的玻璃化轉(zhuǎn)變溫度從PMMA的Tg的高溫區(qū)向PTRIS的Tg的低溫區(qū)移動(dòng)欧美强奸伦乱片。