（2＋1）维KD方程组的行波解

通过行波变换将（2＋1）维KD方程组转变为复域中的常微分方程,给出复化的（2＋1）维KD方程组的亚纯解结构.     

荸荠茎尖组织培养增殖影响因素分析

以影响荸荠茎尖组织培养增殖的三要素6-BA、糖和pH值进行实验研究,分别对处理间和对照的芽苗增殖数进行统计和方差分析。实验结果表明：在MS液体培养基中,添加6-BA质量浓度为1.0 mg.L-1、NAA质量浓度为0.1 mg.L-1、糖质量浓度为65 g.L-1,pH值4.7～5.2,培养30 d荸荠茎尖增殖的芽苗数最多,叶状茎健壮。     

Oxidation behaviors of Ni-Cr-Al superalloy foams at 1 000 ℃ in air

The oxidation behaviors of Ni-16Cr-xAl （x=4.5%, 9.0%, mass fraction） superalloy foams in air at 1000℃ were investigated. The effects of AI content on the resistance to high temperature oxidation were examined. The oxidation mechanisms of the foams were discussed. The results show that the resistance to the oxidation of the Ni-16Cr-xA1 based alloy at 1 000 ℃ increases with the content of A1 increasing from 4.5% to 9.0%. Complex oxide products are formed on the surface of the superalloy foams after the oxidation. Cr203 and A1203 are the predominant oxides for the scales of the foams with 4.5% A1 and 9% A1, respectively. Excellent high temperature oxidation resistance and superior pore conformation stability for the Ni-16Cr-xA1 based superalloy foam with 9% A1 can be mainly attributed to the formation of relatively continuous and protective A1203 oxides on the surface of the foam.     

Bending stress of rolling element in elastic composite cylindrical roller bearing

A new structure design method of elastic composite cylindrical roller bearing is proposed, in which PTFE is embedded into a hollow cylindrical rolling element, according to the principle of creative combinations and through innovation research on cylindrical roller bearing structure. In order to systematically investigate the inner wall bending stress of the rolling element in elastic composite cylindrical roller bearing, finite element analysis on different elastic composite cylindrical rolling elements was conducted. The results show that, the bending stress of the elastic composite cylindrical rolling increases along with the increase of hollowness with the same filling material. The bending stress of the elastic composite cylindrical rolling element decreases along with the increase of the elasticity modulus of the material under the same physical dimension. Under the same load, on hollow cylindrical rolling element, the maximum bending-tensile stress values of the elastic composite cylindrical rolling element after material filling at 0° and 180° are 8.2% and 9.5%, respectively, lower than those of the deep cavity hollow cylindrical rolling element. In addition, the maximum bending-compressive stress value at 90° is decreased by 6.1%.     

柠檬酸对WP催化剂噻吩加氢脱硫性能影响

以柠檬酸(CA)为助剂,采用共浸渍和程序升温还原的方法制备了不同n(CA)/n(WP)的WP催化剂。并用X射线衍射(XRD)、比表面积测定(BET)、扫描电镜(SEM)、热重(TG)分析等方法对催化剂进行了表征,通过高压微反评价了催化剂的噻吩加氢脱硫(HDS)性能。结果表明,柠檬酸并没有改变WP的本体结构,但具有阻止WP晶相颗粒生长的作用,并提高了WP催化剂的BET比表面积。加入柠檬酸改变了硝酸根的分解过程,降低了催化剂的起始磷化还原温度和磷化还原过程终结温度,有利于活性组分在催化剂表面的分散。柠檬酸对WP催化剂噻吩HDS反应有利。Cat-5催化剂具有相对最好的HDS活性,与不加柠檬酸的催化剂相比,其噻吩转化率提高近20.4%。