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Heterogeneous reaction of NO_2 with sea salt particles

science china chemistry 2010年第12期53卷 2652-2656页

作者： YE ChunXiang 1,LI HongJun 1,ZHU Tong 1,SHANG Jing 1,ZHANG ZeFeng 1,2 & ZHAO DeFeng 1 1 State Key Joint laboratory of Environmental Simulation and Pollution control college of Environmental sciences and engineering,peking university,beijing 100871,china 2 college of Atmospheric Physics,Nanjing university of information science and technology,Nanjing 210044,china State Key Joint laboratory of Environmental Simulation and Pollution control college of Environmental sciences and engineering Peking University Beijing China college of Atmospheric Physics Nanjing University of Information Science and Technology Nanjing China

To understand how NO2 reacts with sea salt particles in the atmosphere of Mega-cities in coastal zones,the heterogeneous reaction of NO2 on the surface of wet sea salt was investigated with diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and ion chromatography (IC).Kinetic measurements indicated that nitrate formation on sea salt was second order in NO 2 concentration and reactive uptake coefficients were (5.51 ± 0.19) × 10-7 and 1.26 × 10-6 respectively under 0% and 20% relative humidity (RH) at NO 2 molecular concentration of 1.96 × 1015 mol/*** results showed that liquid water was formed at the site of MgCl2·6H2O,CaCl2·2H2O on the surface of sea salt and made the reaction more sustainable by releasing hydrated water and absorbing water from air even under a low RH (30%).Therefore,pure NaCl particles should not be used to represent sea salt in studies of the heterogeneous reaction with NO2.

关键词： sea salt particles diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) hydrated water absorbed water reactive uptake coefficient

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From titanates to TiO2 nanostructures:controllable synthesis,growth mechanism,and applications

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中国科学:化学 2012年第11期42卷 1649-1649页

作者： XU DongSheng 1,2,LI JianMing 1,YU YuXiang 1,3 & LI JingJian 1 1 beijing National laboratory for molecular sciences,State Key laboratory for Structural chemistry of Unstable and Stable Species college of chemistry and molecular engineering,peking university,beijing 100871,china 2 science and technology on electro-optical information security control laboratory,sanhe 0652.1,china 3 school of chemistry and chemical engineering,south china university of technology,guangzhou 510640,china beijing National laboratory for molecular sciences State Key laboratory for Structural chemistry of Unstable and Stable Species college of chemistry and molecular engineering peking university beijing 100871 china science and technology on electro-optical information security control laboratory sanhe 0652.1 china school of chemistry and chemical engineering south china university of technology guangzhou 510640 china

The design and fabrication of nanostructures based on titanium dioxide (TiO 2) have attracted much attention because of their low cost,non-toxicity,stability,and potential applications in industry and ***,one-dimensional (1D) structured titanates have been used as titanium source to prepare TiO 2 nanostructures with various crystalline phases,shapes,sizes,exposed facets,and hierarchical *** the synthetic strategies,hydrothermal method is a facile route to controllable preparation of well-crystalline TiO 2 in one ***,we review our recent progress in transferring 1D titanates into TiO 2 nanostructures through hydrothermal method,including the transformation mechanism and applications.

关键词： TiO2 titanate hydrothermal nanostructure quasi-one-dimensional

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information security technology Based on DNA Computing

Information Security Technology Based on DNA Computing

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2007 IEEE International Workshop on Anti-counterfeiting,security,Identification

作者： Guangzhao Cui (1) Limin Qin (1) Yanfeng Wang (1 2) Xuncai Zhang (2)(1) college of Electrical information engineering Zhengzhou university of Light Industry Zhengzhou 450002 china(2) Department of control science and engineering Huazhong university of Sci. and Tech. Wuhan 430074 china

DNA computing is a new method of simulating biomolecular structure of DNA and computing by means of molecular biology technological computation. It introduces a fire-new data structure and calculating method, providing a new way for solving the NP-complete problem. It is a new computational method by harnessing the enormous parallel computing ability and high memory density of bio-molecules, which brings potential challenges and opportunities to traditional cryptography. DNA cryptography is a new field of cryptography arising with DNA computing research in recent years. It can realize several security technologies such as Encryption, Steganography, Signature and Authentication by using DNA molecular as information medium. We firstly introduce the basic idea of DNA computing, and then discuss the information security technology in DNA computing.

关键词： DNA DNA computing DNA-Based Cryptography information security technology

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