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81.
Xiaomin Yang Kang Yang Shengwei Wu Xiliang Chen Feng Yu Jungang Li Mingwang Ma Zhiyong Zhu 《Radiation Physics and Chemistry》2010,79(5):606-611
Hydrogels based on poly(vinyl alcohol), water-soluble chitosan and glycerol made by irradiation followed by freeze–thawing were evaluated as wound dressing. MTT assay suggested that the extract of hydrogels was nontoxic towards L929 mouse fibroblasts. Compared to gauze dressing, the hydrogel can accelerate the healing process of full-thickness wounds in a rat model. Wounds treated with hydrogel healed at 11th day postoperatively and histological observation showed that mature epidermal architecture was formed. These indicate that it is a good wound dressing. 相似文献
82.
Optimal control for an elliptic system with pointwise Euclidean norm constraints on the control variables is investigated. First order optimality conditions are derived in a manner that is amenable for numerical realisation. An efficient semismooth Newton algorithm is proposed based on this optimality system. Numerical examples are given to validate the superlinear convergence of the semismooth Newton algorithm. 相似文献
83.
We have developed a sensitive chemiluminescent (CL) assay for cysteine. It is based on the use of water-soluble and fluorescent silver nanoclusters (Ag NCs) which are found to be able to strongly enhance the weak CL signal resulting from the redox reaction between Ce(IV) ion and sulfite ion. This enhancement is inhibited by cysteine under appropriate conditions. Taking advantage of this specific CL inhibition, a novel CL method for the sensitive and selective detection of cysteine was developed. This effect is interpreted in terms of an electronic energy transfer from excited state intermediate sulfur dioxide (originating from the CL reaction between Ce(IV) and sulfite ions) to the Ag-NCs. The latter become electronically excited and thus can act as a new source of emission. The method was applied to the determination of cysteine in the range from 5.0?nM to 1.0?μM, with a detection limit at 2.5?nM (S/N?=?3). Figure
In the presence of Ag NCs that can act as luminophors and energy acceptors, the weak CL signal resulting from the redox reaction between Ce (IV) ion and sulfite ion can be significantly enhanced, and this enhanced CL system can then be inhibited by cysteine under suitable conditions 相似文献
84.
Xiliang He Xiaomin Li Xiangdong Gao Weidong Yu Rui Yang Xinjun Liu Xun Cao 《Applied Physics A: Materials Science & Processing》2012,108(1):177-183
Unipolar reversible resistance switching effects were found in 5 at% Ti-doped polycrystalline Ta2O5 films with the device structure of Pt/Ti–Ta2O5/Pt. Results suggest that the recovery/rupture of the conductive filaments which are involved in the participation of oxygen vacancies and electrons leads to the resistance switching process. Ti-doped Ta2O5 thin films possess higher resistance whether in low-resistance state or high-resistance state and higher resistance switching ratio than Ta2O5 thin films, where Ti addition plays an important role in the resistance switching process by suppressing the migration of oxygen vacancies via forming an electrically inactive Ti/O–vacancy complex. Excellent retention properties of the high and low resistances under constant stress of applied voltage were obtained. 相似文献
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86.
固态缩聚尼龙66的熔化行为 总被引:1,自引:0,他引:1
固态缩聚尼龙66的熔化行为沈百拴,张喜亮,李新法(郑州大学材料工程系郑州450052)关键词尼龙66,固态缩聚物,熔化行为,差示扫描量热注关于固态缩聚反应的研究国内外已有报道[1~4],叵未见固态缩聚尼龙66(SSPPA66)熔化行为的报道。本文用D... 相似文献
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Doping wide-gap materials p type is highly desirable but often difficult. This makes the recent discovery of p-type delafossite oxides, CuM(III)O2, very attractive. The CuM(III)O2 also show unique and unexplained physical properties: Increasing band gap from M(III) = Al,Ga, to In, not seen in conventional semiconductors. The largest gap CuInO2 can be mysteriously doped both n and p type but not the smaller gaps CuAlO2 and CuGaO2. Here, we show that both properties are results of a large disparity between the fundamental gap and the apparent optical gap, a finding that could lead to a breakthrough in the study of bipolarly dopable wide-gap semiconductor oxides. 相似文献
89.
Optimal control for a system consistent of the viscosity dependent Stokes equations coupled with a transport equation for the viscosity is studied. Motivated by a lack of sufficient regularity of the adjoint equations, artificial diffusion is introduced to the transport equation. The asymptotic behavior of the regularized system is investigated. Optimality conditions for the regularized optimal control problems are obtained and again the asymptotic behavior is analyzed. The lack of uniqueness of solutions to the underlying system is another source of difficulties for the problem under investigation. 相似文献
90.
Luo X Lee I Huang J Yun M Cui XT 《Chemical communications (Cambridge, England)》2011,47(22):6368-6370
A highly sensitive, conductometric and label-free biosensor for the detection of immunoglobulin E (IgE) is developed based on the immobilzation of the IgE aptamer onto a single polyaniline nanowire electrochemically synthesized in a facile and controllable way. 相似文献