排序方式: 共有57条查询结果,搜索用时 15 毫秒
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负载金的纳米管钛酸光催化氧化一氧化碳 总被引:3,自引:0,他引:3
用化学方法制备了负载金的纳米管钛酸(Au/H2Ti2O4(OH)2)光催化剂,并用TEM,XPS,XRD和DRS等技术对催化剂进行了表征. 结果表明,经573 K处理后,纳米管钛酸表面及管内均有零价的金颗粒存在. 与纳米管钛酸(H2Ti2O4(OH)2)相比,Au/H2Ti2O4(OH)2具有明显的CO光催化氧化活性,但在暗态时无活性. 经分析认为,暗态时Au与纳米管相互接触的周界处不活泼,故催化剂无CO催化氧化活性; 紫外光照射下,纳米管激发产生e--h+对,e-从纳米管转移到Au0上, 使纳米管和Au-在接触周界处产生相互作用,形成活性位,导致CO催化氧化反应发生. 相似文献
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In terms of our new exact definition of partial Lagrangian and approximate Euler-Lagrange-type equation, we investigate the nonlinear wave equation with damping via approximate Noether-type symmetry operators associated with partial Lagrangians and construct its approximate conservation laws in general form. 相似文献
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Residual symmetry,interaction solutions,and conservation laws of the(2+1)-dimensional dispersive long-wave system 下载免费PDF全文
We explore the(2+1)-dimensional dispersive long-wave(DLW) system. From the standard truncated Painlev′e expansion, the B¨acklund transformation(BT) and residual symmetries of this system are derived. The introduction to an appropriate auxiliary dependent variable successfully localizes the residual symmetries to Lie point symmetries. In particular, it is verified that the(2+1)-dimensional DLW system is consistent Riccati expansion(CRE) solvable. If the special form of(CRE)-consistent tanh-function expansion(CTE) is taken, the soliton-cnoidal wave solutions and corresponding images can be explicitly given. Furthermore, the conservation laws of the DLW system are investigated with symmetries and Ibragimov theorem. 相似文献
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This paper studies variable separation of the evolution equations via the generalized conditional symmetry. To illustrate, we classify the extended nonlinear wave equation utt=Au,uxuxx+Bu,ux,ut which admits the derivative-dependent functional separable solutions DDFSSs). We also extend the concept of the DDFSS to cover other variable separation approaches. 相似文献
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微乳液1-(2-吡啶偶氮)-2-萘酚分光光度法测定蔬菜样品中的钴 总被引:7,自引:0,他引:7
以十二烷基硫酸钠-溴代十六烷基三甲胺(SDS-CIMAB)复合微乳液为介质,对Co(Ⅱ)-1-(2-吡啶偶氮)-2-萘酚的显色反应条件进行了研究.结果表明该体系的λ_(max)=580nm,ε_(580)=3.4×10~4L·mol·cm~(-1),Co(Ⅱ)测定的线性范围为0~2.40mg/L.回收率在96%~103%之间,该法选择性好,用于蔬菜中Co(Ⅱ)含量的测定,得到了满意的结果. 相似文献
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对利用硫铁矿烧渣制备氧化铁黄和氧化铁红进行了研究。考察了影响硫铁矿烧渣还原、酸溶、中和、氧化等过程的各种因素。结果表明,在适宜的条件下,利用烧渣可以制备出用做颜料的氧化铁黄和氧化铁红。 相似文献
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The group classification is carried out on the nonlinear wave equation utt = f(x,u, ux)uzz + g(x,u,uz) by using the preliminary group classification approach. The generators of equivalence group are determined and the corresponding reduced forms are obtained. The result of the work is shown in table form. 相似文献