Controlled Synthesis of CdClOH Sub-nanocones by Low-temperature Solution Process and Their Transformation into CdS Hollow Sub-nanocones

Novel CdClOH sub‐nanocone crystals were successfully synthesized on a large scale by a facile solution‐based method using polymers as crystal growth modifiers. The crystals showed cone‐like morphology. Some factors affecting the morphology and size of the product, such as reaction temperature, concentrations of polyacrylamide (PAM), and pH value of the solution, were systematically studied. Experiments implied that polymer PAM played a key role in the formation of CdClOH sub‐nanocones. A possible formation mechanism of CdClOH sub‐nanocones was suggested based on nucleation‐etching process‐recrystallization in a mild aqueous solution. Furthermore, the as‐prepared CdClOH sub‐nanocones could be further transformed into CdS hollow sub‐nanocones by an anion‐exchange reaction.     

金属醇盐法制备Ta2O5气凝胶

 以乙醇钽为前驱物,采用金属醇盐溶胶-凝胶技术,获得了Ta<sub>2sub>O<sub>5sub>湿凝胶,分析了不同条件下的溶胶-凝胶过程,并初步探讨了凝胶过程机理。Ta<sub>2sub>O<sub>5sub>的溶胶-凝胶过程主要受到水量、催化剂用量及钽源浓度等因素的影响：体系在强酸性条件下凝胶,且随着酸性的增强,体系凝胶时间明显缩短;当水量较少时,凝胶时间随水量的增加而增加,但当水量增加到一定程度时,体系凝胶时间基本不变;实验证明,通过增大溶剂用量,体系凝胶时间延长,气凝胶理论密度降低。通过对溶胶-凝胶过程的控制,结合超临界干燥技术,获得了密度低至44 mg/cm³的Ta<sub>2sub>O<sub>5sub>气凝胶样品。     

受驱动的关联发射激光:双模亚泊松光

如果在关联发射的基础之上再引入原子相干，这样的系统可产生明亮的双模亚泊松光。运用Ｓｃｕｌｙ－Ｌａｍｂ理论计算ＭａｎｄｅｌＱ因子，一方面，当相对相位和相对振幅的量子噪声被抑制到真空噪声水平时，平均模呈现亚泊松光子分布；或者当平均相位和平均振幅的量子噪声被抑制到真空噪声水平时，相对模呈现亚泊松光子分布，ＭａｎｄｅｌＱ因子的最佳值均可达到－０．５。在上述两种情况下，每个关联发射激光（ＣＥＬ）模呈现亚泊松光子分布，ＭａｎｄｅｌＱ因子的最佳值均可达到－０．２５。     

具奇异边界条件的一类拟线性椭圆型方程

得到了一类拟线性椭圆型方程爆破解的存在性。     

含非局部源的反应扩散问题

本文对含非局部源反应扩散方程的定常问题讨论了正解的存在性，对依赖时间的解，给出了整体存在条件和有限时间爆破条件。     

溶胶-凝胶法制备NixCo1-xCoAlO4尖晶石型复合氧化物及其催化分解N2O性能

用溶胶凝胶法制备了一组Ni<sub>xsub>Co<sub>1-xsub>CoAlO<sub>4sub>尖晶石型复合氧化物,并采用表面润湿浸渍K<sub>2sub>CO<sub>3sub>溶液进行了K掺杂改性,用于有氧气氛下的N<sub>2sub>O催化分解反应.采用N<sub>2sub>物理吸附、X-射线衍射(XRD)、扫描电镜(SEM)、H<sub>2sub>-程序升温还原(H<sub>2sub>-TPR)等技术对催化剂进行了表征,考察了催化剂组成、母液pH值、K负载量等制备参数对其催化活性的影响.结果表明,母液pH值为3、K/(Ni+Co)物质的量比为0.1的K/Ni<sub>0.15sub>Co<sub>0.85sub>CoAlO<sub>4sub>催化剂具有较高的N<sub>2sub>O分解活性,450 ℃ N<sub>2sub>O可完全分解.助剂K的加入弱化了催化剂表面金属氧键,提高了催化剂的还原性、催化活性和抗水性.     

臭氧氧化结合湿法喷淋对玻璃窑炉烟气同时脱硫脱硝实验研究

采用臭氧氧化结合湿法喷淋对模拟玻璃窑炉烟气开展了同时脱硫脱硝实验研究.采用不同溶液(NaOH、Na<sub>2sub>S)进行了喷淋实验.结果表明,保证溶液pH值在10以上,NaOH浓度对NO<sub>xsub>脱除效率无影响,SO<sub>2sub>的存在促进了NO<sub>xsub>吸收.当O<sub>3sub>/NO物质的量比为1.6、溶液NaOH浓度为0.5%时,NO<sub>xsub>脱除效率可达70%,SO<sub>2sub>脱除效率在99%以上.往喷淋液中添加Na<sub>2sub>S,NO<sub>xsub>脱除效率随Na<sub>2sub>S浓度增加而提高,SO<sub>2sub>的存在对NO<sub>xsub>脱除效率无影响.当O<sub>3sub>/NO物质的量比为1.2、溶液中NaOH浓度为0.5%、添加剂Na<sub>2sub>S浓度为0.6%时,NO<sub>xsub>脱除效率可达70%,SO<sub>2sub>脱除效率在95%以上.60 min长时间运行实验证明,模拟烟气中的NO<sub>xsub>经碱液和添加剂吸收后主要以NO^-<sub>2sub>的形式存在于喷淋液中,且NO<sub>xsub>脱除效率不随溶液pH值的变化而变化.     

大气压下甲烷火花放电制乙炔和合成气

用大气压下火花放电方法和发射光谱原位诊断技术, 对CH<sub>4sub>直接转化制乙炔和间接转化制合成气进行了研究, 并与介质阻挡放电进行了比较。结果表明, 火花放电具有能量效率高的突出优点, 能够高效地将CH<sub>4sub>活化成C原子、H原子和C<sub>2sub>等活泼物种。当CH<sub>4sub>单独进料时, 能得到以C<sub>2sub>H<sub>2sub>为主的烃类产物。当CH<sub>4sub>与CO<sub>2sub>和O<sub>2sub>共进料时, 能得到H<sub>2sub>/CO比值可调的合成气产物。在用火花放电转化CH<sub>4sub>和CO<sub>2sub>制合成气时, 添加O<sub>2sub>能够避免反应器的结炭问题, 反应温度只需225 ℃, 与常规催化法相比具有明显的低温优势。     

Multiple solutions of semilinear degenerate elliptic boundary value problems

The purpose of this paper is to study a class of semilinear elliptic boundary value problems with degenerate boundary conditions which include as particular cases the Dirichlet problem and the Robin problem. The approach here is based on the super‐sub‐solution method in the degenerate case, and is distinguished by the extensive use of an L^p Schauder theory elaborated for second‐order, elliptic differential operators with discontinuous zero‐th order term. By using Schauder's fixed point theorem, we prove that the existence of an ordered pair of sub‐ and supersolutions of our problem implies the existence of a solution of the problem. The results extend an earlier theorem due to Kazdan and Warner to the degenerate case. © 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim     

Some existence results for an elliptic equation of Kirchhoff‐type with changing sign data and a logarithmic nonlinearity

The paper deals with some existence results for an elliptic equation of Kirchhoff‐type with changing sign data and a logarithmic nonlinearity by direct variational method, Galerkin approach, and sub‐super solutions method. Our results are natural extension of Boulaaras' work in (Math Methods Appl Sci; 41(13):5203‐5210).