Preparation and electrochemical property of CMC/MWCNT composite using ionic liquid as solvent

Carboxymethyl cellulose sodium(CMC)/multi-walled carbon nanotube(MWCNT) composite was prepared by dissolving CMC with ionic liquid as solvent.The microstructure and electrochemical properties of CMC/MWCNTs were studied using field emission scanning electron microscopy(FE-SEM),high-resolution transmission electron microscopy(HR-TEM),X-ray diffraction(XRD) system and electrochemical workstation.The experimental results indicated that the CMC dissolved with ionic liquid could be uniformly enwrapped on the surface of MWCNTs,and the coating thickness of CMC was about 5.4 nm.There are obvious oxidation peaks in the cyclic voltammograms curves of glassy carbon electrode coated with a CMC/MWCNT composite in H2O2 phosphate buffer solution.The MWCNT content and ultrasonic time strongly affected the dispersivity and electrochemical property of CMC/MWCNT composite.While the MWCNT content and ultrasonic processing time was 2 wt% and 2 h respectively,CMC/MWCNT composite exhibited excellent electrocatalytic activity.     

论交叉蒙太奇的运用意义和价值--以电影《撞车》为例

导演保罗·哈吉斯在本片中探索了极为复杂的多线叙事结构。由一起发生在洛杉矶的撞车事故说起，数条故事线索平行推进，又彼此交叉。在错综复杂的表象背后，体现出导演娴熟的叙事控制能力。影片完美融合了情节、感情、以及思想三个方面，可以称之为交叉蒙太奇的运用典范。     

TPX2: of spindle assembly,DNA damage response,and cancer

For more than 15 years, TPX2 has been studied as a factor critical for mitosis and spindle assembly. These functions of TPX2 are attributed to its Ran-regulated microtubule-associated protein properties and to its control of the Aurora A kinase. Overexpressed in cancers, TPX2 is being established as marker for the diagnosis and prognosis of malignancies. During interphase, TPX2 resides preferentially in the nucleus where its function had remained elusive until recently. The latest finding that TPX2 plays a role in amplification of the DNA damage response, combined with the characterization of TPX2 knockout mice, open new perspectives to understand the biology of this protein. This review provides an historic overview of the discovery of TPX2 and summarizes its cytoskeletal and signaling roles with relevance to cancer therapies. Finally, the review aims to reconcile discrepancies between the experimental and pathological effects of TPX2 overexpression and advances new roles for compartmentalized TPX2.     

地形和高层环境对爆发气旋影响的数值研究

利用ＰＳＵ／ＮＣＡＲ中尺度模式对地形和高层环境在１９８３年４月２５日－２７日一次气旋爆性发展中的作用，进行数值试验．在控制试验（包括全物理过程）中，模拟气旋路径和气旋迅速发展同实际观测的类似．诊断分析结果表明高空两支急流、凝结潜热释放及积云混合对这次气旋迅速发展有显著贡献．在地形试验中，发现由太行山、燕山由脉、大兴安岭诱生的地形槽对气旋发展也有明显作用．如取均匀高度作为１００—３００ｈｐａ初始等压面高度场，并积分２４小时，则中低层短波槽消失斜压性减弱，次级环流受到抑制，地面只出现一个浅薄的低压，但低压移动路径则不受影响．     

HPLC法测定康希力中氨苄及邻氯青霉素

采用高效液相色谱法（ＨＰＬＣ）对复方康希力胶囊中氨苄青霉素和邻氯青霉素进行测定。以醋酸盐缓冲液（ｐＨ＝４．５）－甲醇（５５：４５）为流动相，流速为１．０ｍＬ／ｍｉｎ；ＹＷＧ－Ｃ＿（１８）（１０μｍ）为固定相；乙酰苯胺为内标；检测波长为２５４ｎｍ。氨苄青霉素、内标物和邻氯青霉素的保留时间分别为３，０、５．５和９．０ｍｉｎ。氨苄青霉素和邻氯青霉素的回收率（ｎ＝５）分别为１００．３％（ＲＳＤ＝０．３７％）和１００．９％（ＲＳＤ＝０．４３％）。两种组分的最低检出浓度为５μｇ／ｍＬ。     

单指标专题要素图解分级方法试验研究

本文结合常规制图作业,论述了可用于确定单指标专题要素统计数据分级方案的四种图解分级法,即散点图法、直方图法、坡度曲线法及剖面线法的基本理论,以人口密度为例进行了具体分级试验,结果表明,应用图解分级法确定的单指标专题要素统计数据的分级方案,具有规则的分级界线及分级间膈.     

图的周长

设G为n阶2连通图,D(x)={y|y∈V(G)~\(x),d(x,y)≤2},δ_o=min{max{d(x),d(y)}|x,y∈V(G),d(x,y)=2},D(δ_o)={x|x∈V(G),d(x)≥δ_o},δ~*为G中的顶点度且满足:(Ⅰ)δ~*尽可能的大,(Ⅱ)对经(?)x∈D(δ_o)及D~*(x)={y|y∈(D(x)∪{x}),d(y)<δ~*}有|D~*(x)|相似文献   

偶图的周长

设Ｇ（Ａ，Ａ２；Ｅ）为２连通偶图，（Ａ１，Ａ２）为顶点二分划，Ｄ（ｘ）＝｛ｙ｜ｙ∈Ｖ（Ｇ）＼｛ｘ｝，ｄ（ｘ，ｙ）＝２｝，ｄ＾＊ｄ（ｘ）表示Ｄ（ｘ）∪｛ｘ｝中所有的度排成的非减度序列（ｄ＾＊１，ｄ＾＊２，…，ｄ＾＊ｊ，…，ｄ＾＊｜Ｄ（ｘ）｜＋１）中当下标ｊ＝ｄ（ｘ）时的度而当｜Ｄ（ｘ）｜＋１＜ｄ（ｘ）时ｄ＾＊ｄ（ｘ）＝ｄ＾＊｜Ｄ（ｘ）｜＋１。δ０＝ｍｉｎ｛ｄ（ｘ）｜ｘ∈Ｖ（Ｇ）｝，δｉ＝ｍｉｎ｛ｄ＾     

滇西北高山松林净第一性生产力的初步研究

本文研究了滇西北高山松林的净第一性生产力。林龄大净第一性生产力小。林龄约４０年的林分，净第一性生产力１２．１９２ｔ／ｈｍ￣２·ａ，林龄约１００年者为１０．０１３ｔ／ｈｍ￣２·ａ；高山松净第一性生产力为９．８４９和５．６２１ｔ／ｈｍ￣２·ａ，占群落净第一性生产力的８０．８４９％和５６．１４％；随着林龄增加，高山松的净策一性生产力及其在群落中所占的比例也逐渐减少，而其它树种的有所增加；在各器官中，叶的净第一性生产力最高，占３４％～３７％，其次为树干木材，占２１．６２％～２７．４４％。     

滇西北油麦吊云杉林生物量的初步研究

本文研究了滇西北油麦吊云杉林的生物量。林龄大生物量也大，林龄约５０年和１５０年的林分，生物量分别为１２９．５２２９ｔ／ｈｍ￣２和３１３．９８５３ｔ／ｈｍ￣２；在各器官中，木材生物量最大，占群落总生物量的５３．２０％和６０．２５％；乔木一层的生物量占群落总生物量的９３．８０％和９６．３８％；油麦吊云杉的生物量占群落生物量的７６．７８％和７７．１２％。