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NUMERICAL SIMULATION OF ARTIFICIAL VENTILATED CAVITY

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Journal of Hydrodynamics 2006年第3期18卷 273-279页

作者： jia Li-ping WANG Cong WEI Ying-jie WANG Hai-bin ZHANG jia-zhong yu Kai-ping School of Astronautics Harbin Instituteof Technology Harbin 150001 China

In order to determine artificial ventilated cavity shape and provide design reference for engineering applications, the shape of ventilated cavity and the drag of underwater body have been numerically simulated with commercial code in this work. Empirical formulas between ventilated cavity shape and cavitation number are obtained under the conditions of zero incidence and similarity shapes of ventilated cavity and vapor cavity have been validated under the same cavitation number. In addition, the relations between change of cavitator incidence and cavity unsymmetry and the relations of between drag and cavity shape have been primarily analysed. Furthermore, the numerical results fit well with the experimental results.

关键词： ventilated cavity numerical simulation,cavity shape

Dimension Splitting Method for the Three Dimensional Rotating Navier-Stokes Equations

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Acta Mathematicae Applicatae Sinica 2012年第3期28卷 417-442页

作者： Kai-tai LI jia-ping yu Feng SHI Ai-xiang HUAN College of Sciences Xi'an Jiaotong UniversityXi'an 710049China Laboratory for Engineering and Scientific Computing Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China

In this paper, we propose a dimensional splitting method for the three dimensional （3D） rotating Navier-Stokes equations. Assume that the domain is a channel bounded by two surfaces and is decomposed by a series of surfaces i into several sub-domains, which are called the layers of the flow. Every interface i between two sub-domains shares the same geometry. After establishing a semi-geodesic coordinate （S-coordinate） system based on i, Navier-Stoke equations in this coordinate can be expressed as the sum of two operators, of which one is called the membrane operator defined on the tangent space on i, another one is called the bending operator taking value in the normal space on i. Then the derivatives of velocity with respect to the normal direction of the surface are approximated by the Euler central difference, and an approximate form of Navier-Stokes equations on the surface i is obtained, which is called the two-dimensional three-component （2D-3C） Navier-Stokes equations on a two dimensional manifold. Solving these equations by alternate iteration, an approximate solution to the original 3D Navier-Stokes equations is obtained. In addition, the proof of the existence of solutions to 2D-3C Navier-Stokes equations is provided, and some approximate methods for solving 2D-3C Navier-Stot4es equations are presented.

关键词： stream layer 2D manifold Navier-Stokes equations dimension splitting method finite elementmethod

Van der Waals epitaxy: A new way for growth of Ⅲ-nitrides

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Science China(Technological Sciences) 2020年第3期63卷 528-530页

作者： CHEN Yang jia yu-ping SHI Zhi-Ming SUN Xiao-Juan LI Da-Bing State Key Laboratory of Luminescence and Applications Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Inorganic semiconductor plays a key role for today’s technological progress [1–4]. Comparing with other organic semiconductors [5,6] and two-dimensional(2D) metal sulfides [7–10], Ⅲ-nitrides as direct bandgap semi... 详细信息

关键词： A new way for growth of Van der Waals epitaxy nitrides

恩替卡韦对慢性乙肝合并肺结核患者抗结核治疗中肝损伤的预防作用分析

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中国实用医药 2025年第2期20卷 113-116页

作者：余佳平湖北省通城县人民医院感染性疾病科 437400

目的分析恩替卡韦对慢性乙型病毒性肝炎(乙肝)合并肺结核患者抗结核治疗中肝损伤的预防作用。方法112例慢性乙肝合并肺结核患者,随机分为A组和B组,每组56例。A组患者给予抗结核治疗+常规护肝治疗,B组患者给予抗结核治疗+常规护肝治疗+... 详细信息

目的分析恩替卡韦对慢性乙型病毒性肝炎(乙肝)合并肺结核患者抗结核治疗中肝损伤的预防作用。方法112例慢性乙肝合并肺结核患者,随机分为A组和B组,每组56例。A组患者给予抗结核治疗+常规护肝治疗,B组患者给予抗结核治疗+常规护肝治疗+抗乙肝病毒(HBV)治疗。比较两组患者治疗前及治疗2、4周后肝功能指标[总胆红素(TBIL)、谷丙转氨酶(ALT)、谷草转氨酶(AST)],治疗前、治疗4周后血清HBV的脱氧核糖核酸(HBV-DNA)载量,肝损伤及不良反应发生情况。结果治疗2周后,A组患者TBIL、ALT、AST水平分别为(23.1±3.6)μmol/L、(102.6±11.7)U/L、(124.5±15.4)U/L,治疗4周后分别为(26.8±4.1)μmol/L、(141.7±13.5)U/L、(156.7±21.3)U/L;治疗2周后,B组患者TBIL、ALT、AST水平分别为(14.5±2.8)μmol/L、(69.5±10.1)U/L、(72.3±13.2)U/L,治疗4周后分别为(17.1±3.7)μmol/L、(71.6±11.1)U/L、(89.6±12.8)U/L;治疗2、4周后,B组患者的TBIL、ALT、AST水平均明显低于A组,差异均有统计学意义(P<0.05)。治疗4周后,B组患者的HBV-DNA载量为(3.1±0.2)lg copies/ml,明显低于A组的(5.9±0.5)lg copies/ml,差异均有统计学意义(P<0.05)。B组患者的肝损伤发生率8.9%、不良反应发生率16.1%明显低于A组的39.3%、41.1%,差异均有统计学意义(P<0.05)。结论恩替卡韦抗HBV治疗联合抗结核治疗对慢性乙肝合并肺结核患者的疗效较好,有助于降低患者不良反应发生率,预防肝损伤的发生,值得临床推广应用。

关键词：慢性乙型病毒性肝炎肺结核恩替卡韦抗结核肝损伤

Cognitive deviation originating from the different systems between English and Chinese

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Sino-US English Teaching 2008年第8期5卷 40-44,53页

作者： DU jia-li yu ping-fang School of Foreign Languages Ludong University Yantai 264025 China 2. Chinese-Based Center for Dictionary Research Directly under the National Education Ministry Yantai 264025 China

This article discusses the result of cognitive deviation originating from the lexical and syntactic difference between English and Chinese. By analyzing three different aspects involved in this paper, namely, synthetic versus analytic, compact versus diffusive and hypotactic versus paratactic deviations, a conclusion can be drawn that consciousness of necessary information qualifies a translator for work only when he is familiar with this kind of cognitive deviation.

关键词： cognition deviation comparison contrast bilingual education

Changes in source contributions to the oxidative potential of PM_(2.5)in urban Xiamen,China

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Journal of Environmental Sciences 2025年第3期149卷 342-357页

作者： jia-Min Li Si-Min Zhao Qi-yu Miao Shui-ping Wu Jie Zhang James J.Schwab Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies Xiamen UniversityXiamen 361102China Center for Marine Environmental Chemistry and Toxicology College of Environment and EcologyXiamen UniversityXiamen 361102China Atmospheric Sciences Research Center University at AlbanySUNYAlbany 12226USA

The toxicity of PM_(2.5)does not necessarily change synchronously with its mass *** this study,the chemical composition(carbonaceous species,water-soluble ions,and metals)and oxidative potential(dithiothreitol assay,DTT)of PM_(2.5)were investigated in 2017/2018 and 2022 in Xiamen,*** decrease rate of volume-normalized DTT(DTTv)(38%)was lower than that of PM_(2.5)(55%)between the two sampling ***,the mass-normalized DTT(DTTm)increased by 44%.Clear seasonal patterns with higher levels in winter were found for PM_(2.5),most chemical constituents and DTTv but not for *** large decrease in DTT activity(84%−92%)after the addition of EDTA suggested that watersoluble metals were the main contributors to DTT in *** increased gap between the reconstructed and measured DTTv and the stronger correlations between the reconstructed/measured DTT ratio and carbonaceous species in 2022were *** decrease rates of the hazard index(32.5%)and lifetime cancer risk(9.1%)differed from those of PM_(2.5)and DTTv due to their different main *** PMF-MLR model showed that the contributions(nmol/(min·m^(3)))of vehicle emission,coal+biomass burning,ship emission and secondary aerosol to DTTv in 2022 decreased by 63.0%,65.2%,66.5%,and 22.2%,respectively,compared to those in 2017/2018,which was consistent with the emission reduction of vehicle exhaust and coal consumption,the adoption of low-sulfur fuel oil used on board ships and the reduced production of ***,the contributions of dust+sea salt and industrial emission increased.

关键词： Chemical composition Oxidative potential Interannual change PMF-MLR Source apportionment

New concept on teaching English literature to college English majors

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Sino-US English Teaching 2009年第5期6卷 15-18页

作者： jia yu-ping MIAO Yong-gang School of Foreign Languages Harbin Institute of Technology Weihai 264209 China

The teaching of English literature to English majors in universities should emphasize on both the introduction of literary history and the analysis of specific literary works. In view of the present situation in the teaching of English literature, such as limited teaching hours, excessive contents and the outmoded teaching methods, the teachers should change their concept and mode of teaching, improve their teaching methods, and fully explore new concepts to promote the effectiveness and realize the targets of teaching.

关键词： teaching of English literature combination of literary history and literary works teachingmethodology new concept

Pharmacological Mechanism of Chinese Medicine in Systemic Lupus Erythematosus:A Narrative Review

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Chinese Journal of Integrative Medicine 2025年第2期31卷 157-169页

作者： ZHU Bo-yu LIU Zhi-chao ZHAO Zhen-xi HUANG Hui-ping ZHANG Na XIA jia CHEN Wei-wei Department of Rheumatology Shanghai Municipal Hospital of Traditional Chinese MedicineShanghai University of Traditional Chinese MedicineShanghai(200071)China

Systemic lupus erythematosus(SLE)is a chronic autoimmune disorder affecting multiple systems,characterized by the development of harmful autoantibodies and immune complexes that lead to damage in organs and *** medicine(CM)plays a role in mitigating complications,enhancing treatment effectiveness,and reducing toxicity of concurrent medications,and ensuring a safe ***,CM mainly solves the disease comprehensively through multi-target and multi-channel regulation process,therefore,its treatment mechanism is often complicated,involving many molecular *** review introduces the research progress of pathogenesis of SLE from the aspects of genetics,epigenetics,innate immunity and acquired immunity,and then discusses the molecular mechanism and target of single Chinese herbal medicine and prescription that are commonly used and effective in clinic to treat SLE.

关键词： systemic lupus erythematosus Chinese medicine natural extracts treatment review

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水蜡树果中多糖的提取纯化及其抗氧化性

贵州农业科学 2011年第12期39卷 226-228页

作者：于加平吉林农业科技学院生物工程学院吉林吉林132101

为探索水蜡树果中多糖的提取纯化方法及其体外抗氧化活性,采用水提醇沉法提取水蜡树果中多糖,并考察了水蜡树果多糖对羟基自由基(.OH)、超氧自由基(O2-.)和DPPH自由基(DPPH.)的清除效果。结果表明,水蜡树果多糖的含量为0.224mg/g,方法... 详细信息

为探索水蜡树果中多糖的提取纯化方法及其体外抗氧化活性,采用水提醇沉法提取水蜡树果中多糖,并考察了水蜡树果多糖对羟基自由基(.OH)、超氧自由基(O2-.)和DPPH自由基(DPPH.)的清除效果。结果表明,水蜡树果多糖的含量为0.224mg/g,方法回收率在97.70%～100.51%,RSD为0.379%。说明,水蜡树果多糖具有很强的抗氧化活性,是天然的抗氧化剂,对疾病的治疗、食品领域及化妆品产业均有开发利用价值。

关键词：水蜡树果多糖提取抗氧化性