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Multiscale Basis Functions for Singular Perturbation on Adaptively Graded Meshes

Advances in Applied Mathematics and Mechanics 2014年第5期6卷 604-614页

作者： Mei-Ling Sun shan jiang College of Mathematics Science Yangzhou UniversityYangzhou 225002China Education and Technology Center Nantong Vocational CollegeNantong 226007China Department of Mathematics Texas A&M UniversityCollege StationTX 77843USA

We apply the multiscale basis functions for the singularly perturbed reaction-diffusion problem on adaptively graded meshes,which can provide a good balance between the numerical accuracy and computational *** multiscale space is built through standard finite element basis functions enriched with multiscale basis *** multiscale basis functions have abilities to capture originally perturbed information in the local problem,as a result our method is capable of reducing the boundary layer errors remarkably on graded meshes,where the layer-adapted meshes are generated by a given *** numerical experiments we demonstrate that the multiscale method can acquire second order convergence in the L^(2)norm and first order convergence in the energy norm on graded meshes,which is independent ofε.In contrast with the conventional methods,our method is much more accurate and effective.

关键词： Multiscale basis functions singular perturbation boundary layer adaptively graded meshes.

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Effects of Si/Al,Na/Al and H_(2)O/Na_(2)O molar ratios on formaldehyde barrier properties of inorganic aluminosilicate coatings

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International Journal of Minerals,Metallurgy and Materials 2021年第11期28卷 1868-1874页

作者： shan-xia Xiong Jian-lei Kuang Qian-fang Zheng Ting xiao Wen-xiu Liu Qi Wang Peng jiang Wen-bin Cao Department of Inorganic Nonmetallic Materials School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China

Wood-based panels containing urea-formaldehyde resin result in the long-term release of formaldehyde and threaten human *** this study,inorganic aluminosilicate coatings prepared by combining metakaolin,silica fume,NaOH,and H_(2)O were applied to the surfaces of wood-based panels to obstruct formaldehyde *** Si/Al,Na/Al,and H_(2)O/Na_(2)O molar ratios of the coatings were regulated to investigate their effects on the structure and formaldehyde-resistant barrier properties of *** showed that the cracks in the coatings gradually disappeared and the formaldehyde resistance rates of the barrier increased as the Si/Al molar ratio was increased from 1.6 to *** value also increased as the Na/Al molar ratio was increased from 0.9 to 1.2 because of the improvement of the degree of *** the H_(2)O/Na_(2)O molar ratio was increased from 12 to 15,the thickness of the dry film decreased gradually and led to the reduction in the formaldehyde resistance *** the Si/Al,Na/Al,and H_(2)O/Na_(2)O molar ratios were 2.2,1.2,and 12,respectively,the inorganic aluminosilicate coating showed good performance as a formaldehyde-resistant barrier and its formaldehyde resistance rate could reach up to 83.2%.

关键词： aluminosilicate coating chemical composition formaldehyde barrier properties

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22Cr High-Mn-N Low-Ni Economical Duplex Stainless Steels

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Journal of Iron and Steel Research International 2012年第2期19卷 50-56页

作者： jiang Da-wei GE Chang-sheng ZHAO Xiang-juan LI Jun SHI Lu-lu xiao Xue-shan Institute of Materials Shanghai University Shanghai 200072 China jiangsu JosenSpecial Steel Products Co Ltd Xinghua 225721 Jiangsu China

A new family of economical duplex stainless steels in which N or Mn was substituted for Ni with composi- tion of 22Cr-8.0Mn-xNi-1.0Mo-0.7Cu-0.7W-0.3N （x = 0.5 -- 2.0） have been developed by examining the micro- structure, mechanical and corrosion properties of these alloys. The results show that these alloys have a balanced ferrite-austenite relation. In addition, the alloys are free of precipitation of sigma phase and Cr-nitride when solution- treated at 750 to 1300℃ for 30 min. The yield strength, tensile strength and fracture elongation values of experi- mental alloys solution-treated at 1050 ℃ for 30 min are about 500, 750 MPa and 40.0%, respectively. Low-temper- ature impact properties can be improved distinctly with the increase of nickel content. Among the designed DSS al- loys, the alloy with Ni of 2.0% is found to be an optimum alloy with proper phase proportion, better low-tempera- ture impact properties and higher pitting corrosion resistance compared with those o~ other alloys. The mechanical and corrosion properties and lower production cost of the designed DSSs are better than those of AISI 304.

关键词： economical duplex stainless steel low-temperature impact property pitting corrosion resistance

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Cataract surgery in aged patients:phacoemul-sification or small-incision extracapsular cataract surgery

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International Journal of Ophthalmology(English edition) 2011年第5期4卷 513-518页

作者： Tao jiang, shan-Yao Zhao Department of Ophthalmology the Affiliated Hospital of Medical College Qingdao University Qingdao 266003 Shandong Province China The Infectious Diseases Department Eastern Branch of the Affiliated Hospital of Medical College Qingdao University Qingdao 266100 Shandong Province China

AIM: To evaluate the effects and safety of phacoemulsification (Phaco) or small-incision extracapsular cataract surgery (SICS) and intraocular lens (IOL) implantation for aged patients. METHODS: Totally 137 aged patients (149 eyes) underwent cataract operation in the case of stable systemic condition, the blood pressure less than 160/95mmHg, blood glucose less than 8mmol/L, and under the help of electrocardiogram surveillance by anesthesiologists during the operation. 106 aged patients (114 eyes) underwent Phaco while 31 aged patients (35 eyes) underwent SICS. The postoperative visual acuity, corneal endothelial cell loss, surgery time and major complications were observed and analyzed retrospectively. RESULTS: The best-corrected visual acuity (BCVA) of >= 0.6 was achieved in 135 eyes (92.6%) at 1 month postoperatively (chi(2)=259.730, P 0.05). Postoperative corneal endothelial cell loss was 18.6%, in PHACO group, the rate was 18.5%; in SICS group, the rate was 19.0%, the difference of which was no significant (chi(2)=0.102, P>0.05). The surgery time was different in two groups. No severe complications occurred. CONCLUSION: Both Phaco and SICS combined with IOL implantation for aged patients are effective and safe. Before surgery, detailed physical examination should be performed. When the systemic condition is stable, cataract surgery for aged patients is safe.

关键词： phacoemulsification small-incision extracapsular cataract surgery intraocular lens aged cataract diabetes hypertension

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Simulation of heat transfer of supercritical water in obstacle-bearing vertical tube

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Nuclear Science and Techniques 2010年第4期21卷 241-245页

作者： ZHANG Bo shan Jianqiang jiang Jing Schoocl of Nuclear Science and Technology Xi 'an Jiaotong University Xi 'an 710049 China

The heat transfer coefficient is very low at bulk temperatures higher than the pseudo-critical point,because the supercritical pressure leads to a vapor-like *** this paper,the heat transfer downstream an obstacle-bearing vertical tube is simulated by the CFD code of Fluent 6.1,using an adaptive grid in the supercritical *** reliable results are obtained by the RNG k-ε model using the enhanced wall *** blockage ratio and local temperature of obstacle affect greatly the heat transfer enhancement,and the resultant influence region and decay trend are compared with the existing equations.

关键词：软件模拟垂直管超临界水热转移传热系数超临界压力自适应网格超临界条件

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