【文章內(nèi)容簡介】 y, stability our presentation, we mainly focus on the influence of scale factor on the due to lack of active sites for mesoporous silica, two main methods(surface loading, modified framework)are widely reported, by which various organic or inorganic active sites can be immobilized on the surface or incorporated into the framework of mesopoous though various morphologies of mesoporos silica were widely synthesized, the synthesis of the mesoporos silica, with three simultaneous characteristics including doped metal, mesoporous structure and specific morphology, is always a challenge, which is rarely other words, for our case exploring a proper condition, at which the silicon and metal sources can simultaneously hydrolyze, can ensure a desired next, let’s look at the synthetic ,?.then, ?.after that, ?.at last, we obtained the in this work, by changing the synthesis conditions, such as ?, and so on, the pure mesoporous silica with different morphologies were synthesized, including nanosphere, nanorod, helix, capsule and will focus on the preparation and catalytic application of mesoporous silica with nanotube the sem images of samples: a1, a2, a3 are shown in the can be seen that sample a1 is nanowirelike with length of about 2μm and diameter of about the amount of...is g, the morphology of sample a2 became to be short and thick rods and the size is about 1μm in length and 400nm in diameter, further increasing the amount of..., the sample a3 and a4 turned to be spherical also can be seen that the diameters of samples a3 and a4 are substantially the same about , the spherical morphology of a4 is more regular than that of xrd patterns showed four reflection peaks attributed to(100),(110),(200)and(210), respectively, due to the hexagonal then, we keep the same amount of..., increasing the amount of....we found that the length increased xrd patterns also showed the hexagonal sructure of samples b1, b2, b3, moreover, an additional proof of the hexagonal symmetry structure is given by tem and the ft n2 adsorptiondesorption isotherms of the samples b1, b2, b3, b4 exhibit a typical typeiv to the table of structural parameters, we can find that the specific surface area and total pore volume increase gradually, the thickness of wall decrease and there is no obvious change in furthermore, the possible synthesis mechanism of the mesoporous silica nanotube in dual templates system was suggest that due to electrostatic repulsion between positively charged ammonium ions from hydrated ammonia molecules and hydrophilic groups of..., especially in ammonia(nh3, 25wt.%)solution, the high concentrated ammonium ions provide a crowded and repulsive space to prevent the conjunction of...molecules, leading to the formation of the rodlike micelles as template to form pore structure instead of spherelike role of cotemplate...is suggested to tune the length of rodlike micelles by arranging itself along the axis of channel with peo and ppo part immersed in the hydrophilic and the hydrophobic group of cta+ a result, the mesoporous nanotube with different length will be , the nonpolar...micelles are not affected by positively charged the amount of cotemplate increased further, the nonpolar...micelles tend to control the morphology of micelles which are sequentially from nanotube, short rod to spherelike my be the reason that the nonpolar...micelles would provide stronger attractive force than the electrostatic repulsion derived from the peo block, ammonium ions and head group of..., in order to investigate the influence of the morphology and structure of mesoporous silica on catalytic performance, the samples with copper incorporated were the figure shows the sem and tem images of samples a1, a2, a3, from which we can see they represent incremental length in the range of about , and , and insignificant change in diameter around xrd patterns, there are also four reflection peaks for the samples with copper incorprated, respectively, which indicates the incorporation of the inorganic copper salt has no obvious effect on the hexagonal sructure and the ordered degree of pore , the trends in length and the diameter of nanotube are the n2 adsorptiondesorption isotherms of the samples a1, a2, a3 exhibit a typical typeiv isotherm according to the iupac classification and no hysteresis loop at the relative pressure range of ≤p/p0≤, implying the samples not only have ordered mesoporous structure but also the uniform pore , the pore diameters did not change significantly at different weight ratio of.../....the most probable pore sizes of samples a1, a2, a3 are determined to be , , nm, structural parameters are listed in following this table summarized the catalytic activity of coppermodified porous silica nanotube in the direct hydroxylation of benzene with h2o2 as catalysts showed high catalytic activity, and direct proportional relationship between the benzene conversion and the length of the silica the similar copper content determined by icp, the variations of catalytic activities were probably caused by different retention time of reagent in the nanotube with different it is summary and future research this part of research can be summed up from the following three control,catalytic activity and future research 看this thanks篇二：來自公司人員們的ppt制作演講經(jīng)驗 由于近來半年我在公司做ppt演講也有近十次了，所以今天我也想談一談這個問題，補充一點我的看法。如何做好ppt演講。首先我們要先明白ppt在演講中的作用。在演講中ppt的重要作用同樣是傳遞信息，不過它有其特殊性。ppt可以是演講內(nèi)容的一個簡單的精明的框架。為演講者減輕負擔(dān)，也為聽眾提供了更簡單的抓住演講主要內(nèi)容的方式。ppt在演講中應(yīng)該始終扮演著助手的角色，他的作用應(yīng)該是輔助于演講者的表達。如果我們把順序反過來，事情就變了味道。但看起來卻說的過去，比如我們的演講是為我們的ppt添磚加瓦，用以說明它的“美麗”。這種觀點也就是ppt成了主角，我們要盡力把它描述清楚。但事實上我們是為了演講而做的ppt，而不是為了ppt做演講。前兩天飛利浦公司來人到我們公司做了一場關(guān)于lcd的演講。主講者是個歐洲人。他一身標準的商務(wù)著裝，雖然有啤酒肚，但標準的著裝也使他在我們這群身著休閑裝來工作的年輕人面前顯得很有權(quán)威。他的演講讓我眼前一亮。他并沒有按照標準的ppt從上到下按順序演講，而是讓ppt跟隨他的思想而動。沒有固定的順序，ppt總在上下翻動。我所見過的幾種糟糕的ppt演講 。這是一個女同事的ppt演講。她有女人普遍具備的性格：認真，仔細。但她有些缺少自信。當(dāng)上司讓她準備一個演講，并表示這關(guān)心到她的評價的時候，她做了這樣的一份ppt。從ppt第一頁的目錄后，每一頁都密密麻麻寫滿了她找來的有關(guān)資料，直到最后一頁結(jié)束。她害怕漏掉一點點自己辛勤的勞作。整個演講成了她的閱讀課，她把ppt