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Numerical Study on the Aerodynamic and Fluid−Structure Interaction of An NREL-5MW Wind Turbine

China Ocean Engineering 2024年第3期38卷 363-378页

作者： ZHAO Mi YU Wan-li wang pi-guang QU Yang DU Xiu-li Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education Beijing University of TechnologyBeijing 100124China State Key Laboratory of Bridge Engineering Safety and Resilience Beijing University of TechnologyBeijing 100124China

A 5-MW wind turbine has been modeled and analyzed for fluid-structure interaction and aerodynamic *** this study, a full-scale model of a 5-MW wind turbine is first developed based on a computational fluid dynamics(CFD) approach, in which the unsteady, noncompressible Reynolds Averaged Navier-Stokes(RANS) method is used. The main focus of the study is to analyze the tower shadow effect on the aerodynamic performance of the wind turbine under different inlet flow conditions. Subsequently, the finite element model is established by considering fluid/structure interactions to study the structural stress, displacement, strain distributions and flow field information of the structure under the uniform wind speed. Finally, the fluid-structure interaction model is established by considering turbulent wind and the tower shadow effect. The variation rules of the dynamic response of the one-way and two-way fluid-structure interaction(FSI) models under different wind speeds are analyzed, and the numerical calculation results are compared with those of the centralized mass model. The results show that the tower shadow effect and structural deformation are the main factors affecting the aerodynamic load fluctuation of the wind turbine, which in turn affects the aerodynamic performance and structural stability of the blades. The structural dynamic response of the coupled model shows significant similarity, while the structural displacement response of the former exhibits less fluctuation compared with the conventional centralized mass model. The one-way fluid-structure interaction(FSI)model shows a higher frequency of stress-strain and displacement oscillations on the blade compared with the two-way FSI model.

关键词： computational fluid dynamics methods(CFD) tower shadow effect aerodynamic performance fluidstructure interaction space flow field

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Analytical Solution and Simplified Formula for Added Mass of Horizontal and Vertical Motions of Truncated Cylinders Under Earthquake Action

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China Ocean Engineering 2024年第1期38卷 54-67页

作者： wang pi-guang LYU Si-yu QU Yang ZHAO Mi DU Xiu-li State Key Laboratory of Bridge Engineering Safety and Resilience Beijing University of TechnologyBeijing 100124China Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education Beijing University of Tech-nologyBeijing 100124China

This paper investigates the hydrodynamic characteristics of floating truncated cylinders undergoing horizontal and vertical motions due to earthquake excitations in the finite water *** governing equation of the hydrodynamic pressure acting on the cylinder is derived based on the radiation theory with the inviscid and incompressible *** governing equation is solved by using the method of separating variables and analytical solutions are obtained by assigning reasonable boundary *** analytical result is validated by a numerical model using the exact artificial boundary simulation of the infinite *** main variation and distribution characteristics of the hydrodynamic pressure acting on the side and bottom of the cylinder are analyzed for different combinations of wide-height and immersion *** added mass coefficient of the cylinder is calculated by integrating the hydrodynamic pressure and simplified formulas are proposed for engineering *** calculation results show that the simplified formulas are in good agreement with the analytical solutions.

关键词： earthquake hydrodynamic pressure truncated cylinder added mass simplified formula

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Ki-67 Change in Anthracyline-containing Neoadjuvant Chemotherapy Response in Breast Cancer

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Current Medical Science 2024年第1期44卷 156-167页

作者： Zi-guo YANG Le-hao REN Feng wang pi-lin wang Wen-yan wang Shu-ye LIN Department of General Surgery Beijing Tiantan HospitalCapital Medical UniversityBeijing 100070China Department of Critical Care Medicine Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022China Cancer Research Center Beijing Chest HospitalCapital Medical University/Beijing Tuberculosis and Thoracic Tumor Research InstituteBeijing 101149China

Objective Anthracycline-containing regimens are irreplaceable in neoadjuvant chemotherapy(NAC)for breast cancer(BC)at ***,30% of early breast cancer(EBC)patients are resistant to anthracycline-containing chemotherapy,leading to poor prognosis and higher ***-67 is associated with the prognosis and response to therapy,and it changes after *** A total of 105 BC patients who received anthracycline-containing NAC were ***,the optimal model of Ki-67 was selected,and its predictive efficacy was ***(IHC)was used to determine the estrogen receptor(ER),progesterone receptor(PR),and human epidermal growth factor receptor 2(HER-2)status and Ki-67 *** in situ hybridization(FISH)was used to verify the HER-2 when the IHC score was 2+.Results The post-NAC Ki67 level after treatment with anthracycline drugs was lower than pre-NAC Ki-67(19.6%±23.3%vs.45.6%±23.1%,P<0.001).Furthermore,patients with the Ki-67 decrease had a border line higher pathological complete response(pCR)rate(17.2%vs.0.0%,P=0.068),and a higher overall response rate(ORR)(73.6%vs.27.8%,P<0.001),when compared to patients without the Ki-67 *** ΔKi-67 and ΔKi-67%were valuable markers for the prediction of both the pCR rate and *** area under the curve(AUC)for ΔKi-67 on pCR and ORR was 0.809(0.698-0.921)and 0.755(0.655-0.855),respectively,while the AUC for ΔKi-67% on pCR and ORR was 0.857(0.742-0.972)and 0.720(0.618-0.822),*** logistic regression model 1 revealed thatΔKi-67 was an independent predictor for both pCR[odds ratio(OR)=61.030,95% confidence interval(CI)=4.709-790.965;P=0.002]and ORR(OR=10.001,95%CI:3.044-32.858;P<0.001).Multivariate logistic regression model 2 revealed thatΔKi-67%was also an independent predictor for both pCR(OR=408.922,95%CI=8.908-18771.224;P=0.002)and ORR(OR=5.419,95%CI=1.842-15.943;P=0.002).Conclusions The present study results suggest thatΔKi67 andΔKi67%are candidate predictor

关键词： breast cancer change in Ki-67 neoadjuvant chemotherapy anthracycline,response

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Improving Thermal-oxidative Aging Resistance of Styrene-butadiene Rubber by Antioxidant Loaded Silica Aerogel

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Chinese Journal of Polymer Science 2024年第8期42卷 1198-1209页

作者： Xue-Fei ping Yu wang Lu Liu Fu-Yong Liu Hong-Wei He pi wang Wen-Wen Yu Qiang Zheng College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030032China Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310058China

The antioxidant N-isopropyl-N'-phenyl-p-phenylenediamine(4010NA)was dissolved in ethanol and impregnated into silica aerogel(SAG)via vacuum-pressure cycles,yielding composite particles(A-N)with enhanced sustained-release and reinforcing *** effect of A-N on the mechanical properties and thermal-oxidative aging resistance of styrene-butadiene rubber(SBR)vulcanizates was *** and BET assessments indicated that the loading efficiency of 4010NA in SAG reached 14.26%within ethanol's solu bility *** A-N into SBR vulcanizates significantly elevated tensile strength by 17.5%and elongation at break by 41.9%over those with fumed silica and ***,A-N notably enhanced the thermal-oxidative aging resistance of *** aging for 96 h at 100℃,the tensile strength and elongation at break of SBR with A-N sustained 70.09%and 58.61%of their initial values,respectively,with the retention rate of elongation at break being 62.8%higher than that of SBR with fumed silica and free *** study revealed that A-N composite particles significantly inhibited the crosslinking in SBR's molecular chains,reducing hardening and embrittlement during later thermal-oxidative aging stages.

关键词： Styrene-butadiene rubber Silica aerogel Loading modification Thermal-oxidative aging

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Chiral liquid crystals based on pillararene and supramolecular self-assembly-induced chirality amplification

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Science China Chemistry 2024年第10期67卷 3373-3381页

作者： Bicong Liang Yujie Cheng Xiong Liu Lan Jia Xuehong Wei Qiang Zheng pi wang Danyu Xia Xuzhou Yan College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Scientific Instrument Center Shanxi UniversityTaiyuan 030006China School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative MoleculesShanghai Jiao Tong UniversityShanghai 200240China

Macrocyclic liquid crystals combine the unique property of liquid crystals and excellent supramolecular assembly ability of macrocyclic *** is a significant challenge to make rational use of the advantages of macrocyclic compounds to prepare new macrocyclic ***,a type of macrocycles with rigid pillar-shaped frameworks and easy-tofunctionalize property,are excellent building blocks to fabricate liquid crystal ***,the site-selective modification property of pillararene has been rarely exploited to tailor liquid crystal *** reported pillararene-based liquid crystal systems are almost prepared by per-functionalized ***,we report the regulation of chiral liquid crystal behaviors by different derivatization of *** and thermotropic liquid crystals with different chirality were obtained by self-assembly of pillararene with different numbers of cholesterol *** bridge between thermotropic liquid crystal and lyotropic liquid crystal based on pillararene is *** addition,the chirality of the mesogens can be amplified through supramolecular self-assembly driven by noncovalent *** on the different liquid crystal behaviors,the optical signal of the pillararene-based chiral liquid crystals was used to fabricate an information encryption *** work provides a simple strategy to regulate liquid crystal behaviors via pillararene-based mesogens and realizes information encryption through the combination of different types of liquid crystals.

关键词： chiral liquid crystal pillararene self-assembly cholesterol information encryption

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The mechanism and pathway of the ozonation of 4-chlorophenol in aqueous solution

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Science China Chemistry 2006年第4期49卷 379-384页

作者： pi Yunzheng wang Jianlong Laboratory of Environmental Technology Institute of Nuclear Energy Technology Tsinghua University Beijing 100084 China Laboratory of Environmental Technology Institute of Nuclear Energy Technology Tsinghua University Beijing 100084 China

The removal efficiency of 4-chlorophenol by ozonation was studied, and the reaction mechanism and characteristic of ozonation of 4-chlorophenol were investigated. Ozone and hydroxyl radicals are two strong oxidants during the process of ozonation. The experimental results showed that when there was no scavenger to inhibit OH· radicals, an intermediate product, hydrogen peroxide was formed during the ozonation of 4-chlorophenol. Hydrogen peroxide reacted with ozone at neutral pH and produced hydroxyl radicals. Ozone at the dosage of 113 mg/L could remove 20 mg/L 4-chlorophenol and 39% TOC. With the complete inhibition of hydroxyl radicals, molecular ozone could effectively destroy 4-chlorophenol to form 4-quinone, which was subsequently oxidized to formic acid and oxalic acid. Two reaction pathways of the degradation of 4-chlorophenol by ozone and O3/OH· were proposed in this study. Ozonation is an effective method for reducing 4-chlorophenol, and has potential to practical application.

关键词： 4-chlorophenol, ozone, hydrogen peroxide, 4-quinone, hydroxyl radicals.

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A field study of advanced municipal wastewater treatment technology for artificial groundwater recharge

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Journal of Environmental Sciences 2006年第6期18卷 1056-1060页

作者： pi Yun-zheng wang Jian-long Laboratory of Environmental Technology Institute of Nuclear and New Energy Tsinghua University Beijing 100084 China

Field studies were conducted to investigate the advanced treatment of the municipal secondary effluent and a subsequent artificial groundwater recharge at Gaobeidian Wastewater Treatment Plant, Beijing. To improve the secondary effluent quality, the combined process of powdered activated carbon adsorption, flocculation and rapid sand filtration was applied, which could remove about 400 dissolved organic carbon （DOC） and 70% adsorbable organic halogens. The results of liquid size exclusion chromatography indicate that in the adsorption unit the removed organic fraction was mainly low molecular weight compounds. The fractions removed by the flocculation unit were polysaccharides and high molecular weight compounds. The retention of water in summer in the open recharge basins resulted in a growth of algae. Consequently, DOC increased in the polysaccharide and high molecular weight humic substances fraction. The majority of the DOC removal during soil passage took place in the unsaturated area. A limited reduction of DOC was observed in the aquifer zone.

关键词： artificial groundwater recharge soil aquifer treatment dissolved organic carbon

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A Fluorescent Supramolecular Crosslinked Polymer Gel Formed by Crown Ether Based Host-Guest Interactions and Aggregation Induced Emission

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Chinese Journal of Polymer Science 2015年第6期33卷 890-898页

作者： Xiao-fan Ji pi wang Hu wang 黄飞鹤 State Key Laboratory of Chemical Engineering Department of ChemistryZhejiang University

Based on the combination of B21C7/dialkylammonium salt host-guest interactions and tetraphenylethylene （TPE）-based aggregation-induced emission （AIE） effect, a fluorescent supramolecular crosslinked polymer gel was successfully prepared. Compared with the solution of TPE-containing small molecules, this gel exhibited remarkable fluorescence enhancement due to the AIE effect of TPE units. The ＂gelation induced fluorescence emission＂ phenomenon can be explained by the hindered intramolecular rotation of phenyl rings of TPE. Because of the reversibility and stimuli-responsiveness of the B21C7/dialkylammonium salt host-guest interactions, the transition between the fluorescent supramolecular crosslinked polymer gel and the disassembled sol with very weak fluorescence can be realized by adding pH and thermal stimuli. This novel material contributes to the development of supramolecular chemistry, polymer science and fluorescent materials and offers a new method to construct functional supramolecular materials.

关键词： Fluorescent polymer gel Aggregation-induced emission Host-guest interactions Responsiveness.

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基于柱[5]芳烃和双醛淀粉的聚合物材料的制备及其对孔雀石绿的吸附研究

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化工新型材料 2024年第S1期52卷 212-217页

作者：牛丁梁必聪麻嘉鑫贾兰王丕太原理工大学材料科学与工程学院太原030024 山西大学大型科学仪器中心太原030006

以双醛淀粉(DAS)为原料,利用氨基功能化的柱[5]芳烃(P[5])和1,6-己二胺作为交联剂,通过席夫碱反应制备了一种新型淀粉基聚合物材料(P[5]+C6-DAS)。吸附实验结果表明,相对于DAS,P[5]+C6-DAS对孔雀石绿(MG)具有更快的吸附动力学和更高的... 详细信息

以双醛淀粉(DAS)为原料,利用氨基功能化的柱[5]芳烃(P[5])和1,6-己二胺作为交联剂,通过席夫碱反应制备了一种新型淀粉基聚合物材料(P[5]+C6-DAS)。吸附实验结果表明,相对于DAS,P[5]+C6-DAS对孔雀石绿(MG)具有更快的吸附动力学和更高的吸附容量。在100mg/L的条件下,P[5]+C6-DAS可在45min内去除94.4%的MG染料。此外,其吸附过程符合准二级吸附动力学模型和Langmuir等温吸附模型,最大吸附量可达3470.2mg/g。因此,P[5]+C6-DAS是一种具有潜在应用价值的MG染料吸附剂。

关键词：双醛淀粉柱芳烃席夫碱反应孔雀石绿吸附机制

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Analytical solution for earthquake induced hydrodynamic pressure on a circular cylinder in a two-layer fluid

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Journal of Hydrodynamics 2020年第5期32卷 901-913页

作者： pi-guang wang Mi Zhao Xiu-li Du Jing-bo Liu Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education Beijing University of TechnologyBeijing 100124China College of Architecture and Civil Engineering Beijing University of TechnologyBeijing 1000124China Department of Civil Engineering Tsinghua UniversityBeijing 100084China

The analytical method is adopted to investigate the earthquake-induced hydrodynamic pressure on a circular cylinder surrounded by a two-layer *** on the radiation theory,the analytical expressions of the hydrodynamic pressure and the hydrodynamic force on a rigid circular cylinder are ***,the dispersion relation for the radiation problem in a two-layer fluid,and the added mass and the damping coefficients on the circular cylinder are *** earthquake-induced hydrodynamic forces on the circular cylinder in a two-layer fluid are furtherly *** is founded that the hydrodynamic pressures on the circular cylinder include not only the surface-wave and perturbing wave modes,but also the internal-wave *** is quite different from the case in a single-layer ***,the results indicate that the internal-wave mode has little influence on the hydrodynamic forces on the circular cylinder in a two-layer ***,the seismic responses of the flexible cylinder in single-layer and two-layer fluids are *** examples show that the seismic responses of the cylinder in a two-layer fluid are much larger than those in a single-layer fluid.

关键词： Circular cylinder earthquake hydrodynamic force surface wave two-layer fluid

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