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Fluid Dynamics & Materials Processing 2024年第2期20卷 383-400页

作者： Yongchun Liu ni qiao Yanli Yang Yanchun Li Chunxiao He Siyang Wang Chengcheng Liu Ruixia Lei Wang Li Wenwen Gao College of Chemistry and Chemical Engineering FLUOBON Pilot Base of Chemical EngineeringLongdong UniversityQingyang745000China Qingyang Solid and Hazardous Waste Pollution Prevention and Control Management Center Qingyang745000China Gansu Qingluyuan Environmental Monitoring Co. Ltd.Qingyang745000China School of Chemistry and Chemical Engineering Shanxi Key Laboratory of Low Metamorphic Coal Clean UtilizationYulin UniversityYulin719000China

A silylated melamine sponge(SMS)was prepared by two simple steps,namely,immersion and dehydration of a melamine sponge coated with *** silylated structure of SMS was characterized by FT-IR(Fourier-transform infrared)spectroscopy,SEM(Scanning electron microscopy)and in terms of water contact *** oil-water absorption and separation capacities were measured by FT-IR and UV-visible *** experimental results have shown that oligomeric silanol covalently bonds by Si-N onto the surface of melamine sponge *** has shown superhydrophobicity with a water contact angle exceeding 150°±1°,a better separation efﬁciency with regard to diesel oil(by 99.31%(wt/wt%)in oil-water mixture and even up to 99.99%(wt/wt%)for diesel oil in its saturated aqueous ***,SMS inherited the intrinsicﬂame retardancy of the melamine *** general,SMS has shown superhydrophobicity,high porosity,excellent selectivity,remarkable recyclability,and better absorption capacity for various oils and organic solvents,and a high separation efﬁciency for oil in saturated aqueous solutions.

关键词： Methyltrichlorosilane silylated melamine sponge(SMS) superhydrophobicity absorption capacity oil-water separable efﬁciency ﬂame retardancy

Parametric study on supersonic flutter of angle-ply laminated plates using shear deformable finite element method

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Acta Mechanica Sinica 2011年第5期27卷 749-756页

作者： Wei Xia qiao ni School of Civil Engineering and Mechanics Huazhong University of Science and Technology430074 Wuhan China MOE Key Laboratory for Strength and VibrationSchool of Aerospace Xi＇an Jiaotong University710049 Xi＇an China

The influence of fiber orientation,flow yaw angle and length-to-thickness ratio on flutter characteristics of angle-ply laminated plates in supersonic flow is studied by finite element *** structural model is established using the Reissner-Mindlin theory in which the transverse shear deformation is *** aerodynamic pressure is evaluated by the quasi-steady first-order piston *** equations of motion are formulated based on the principle of virtual *** the harmonic motion assumption,the flutter boundary is determined by solving a series of complex eigenvalue *** study shows that （1） The flutter dynamic pressure and the coalescence of flutter modes depend on fiber orientation,flow yaw angle and length-to-thickness ratio;（2） The laminated plate with all fibers aligned with the flow direction gives the highest flutter dynamic pressure,but a slight yawing of the flow from the fiber orientation results in a sharp decrease of the flutter dynamic pressure;（3） The angle-ply laminated plate with fiber orientation angle equal to flow yaw angle gives high flutter dynamic pressure,but not the maximum flutter dynamic pressure;（4） With the decrease of length-to-thickness ratio,an adverse effect due to mode transition on the flutter dynamic pressure is found.

关键词： Panel flutter Angle-ply laminates Fiber orientation Flow yaw angle Length-to-thickness ratio

DIFFERENTIAL QUADRATURE METHOD TO STABILITY ANALYSIS OF PIPES CONVEYING FLUID WITH SPRING SUPPORT

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Acta Mechanica Solida Sinica 2000年第4期13卷 320-327页

作者： ni qiao Huang Yuying Huazhong Univ Sci & Technol Dept Mech Wuhan 430074 Peoples R China

It is a new attempt to extend the differential quadrature method(DQM) to stability analysis of the straight and curved centerlinepipes conveying fluid. Emphasis is placed on the study of theinfluences of several parameters on the critical flow *** to other methods, this method can more easily deal with thepipe with spring support at its boundaries and asks for much lesscomputing effort while giving ac- ceptable precision in the numericalresults.

关键词： pipes conveying fluid differential quadrature method critical flowvelocity

原型传承与嬗变:《南柯太守传》与《南柯记》之比较

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贵州师范学院学报 2024年第2期40卷 24-30页

作者：肖俏妮米进忠东华理工大学文法与艺术学院江西南昌344000

“临川四梦”之一《南柯记》,源于唐传奇《南柯太守传》。这两部同题材的作品间,存在原型的传承与嬗变现象。从创作心理角度分析,蚁王和南柯等原型的传承,缘于汤显祖与李公佐二人寄托于纸上的相似心绪与情思;而公主与右相等原型的嬗变,... 详细信息

“临川四梦”之一《南柯记》,源于唐传奇《南柯太守传》。这两部同题材的作品间,存在原型的传承与嬗变现象。从创作心理角度分析,蚁王和南柯等原型的传承,缘于汤显祖与李公佐二人寄托于纸上的相似心绪与情思;而公主与右相等原型的嬗变,则与历史语境的变化相关。朝代几经更迭后,汤显祖所处时代政治局势与社会观念皆与李公佐所处时代不同,潜移默化中影响了汤显祖的创作。除此以外,文本外部诸多条件也推动着原型的嬗变,如传播载体、传播方式、受众群体等,都是作者创作前考虑的要素,为适应传播上的需要,作者也会对原型做出调整。

关键词：《南柯太守传》《南柯记》汤显祖原型文学传播

CHAOTIC TRANSIENTS IN A CURVED FLUID CONVEYING TUBE

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Acta Mechanica Solida Sinica 2005年第3期18卷 207-214页

作者： ni qiao Wang Lin Qian Qin Department of Mechanics Huazhong University of Science and Technology Wuhan 430074 China

The chaotic transients of a curved fluid conveying tube subjected to a nonlinear foundation are investigated. The assumption of the inextensibility of the tube is applied to derive the nonlinear differential equation of motion via the Newtonian approach, with the differential quadrature method used to discretize the curved tube model in the spatial domain. And the nonlinear dynamic motion equation is obtained. The numerical analysis shows that, the final steady states are sensitive to the initial system conditions in a large parameter region of the fluid speed. This phenomenon of chaotic transients is infrequent for fluid conveying tubes.

关键词： curved fluid conveying tube chaotic transient nonlinear dynamics DQM

VIBRATION AND STABILITY OF VERTICAL UPWARD-FLUID-CONVEYING PIPE IMMERSED IN RIGID CYLINDRICAL CHANNEL

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Acta Mechanica Solida Sinica 2008年第5期21卷 431-440页

作者： Qin Qian Lin Wang qiao ni Department of Mechanics Huazhong University of Science and Technology Wuhan 430074 China

A theoretical model is developed for the vibration and stability of a vertical pipe subjected concurrently to two dependent axial flows. The external fluid, after exiting the outer annular region between the pipe and a rigid cylindrical channel, is conveyed upwards inside the pipe. This configuration thus resembles of a pipe that aspirating fluid. The equation of planar mo- tion is solved by means of the differential quadrature method （DQM）. Calculations are conducted for a slender drill-string-like and a bench-top-size system, for different confinement conditions of the outer annular channel. It is shown that the vibrations of these two systems are closely related to the degree of confinement of the outer annular channel. For a drill-string-like system with narrow annuli, buckling instability may occur in the second and third modes. For a bench-top-size system, however, both buckling and flutter may occur in the lowest three modes. The form of instability depends on the annuli size.

关键词： pipe conveying fluid annular flow axial flow drill-string stability critical flow velocity

NONLINEAR RESPONSES OF A FLUID-CONVEYING PIPE EMBEDDED IN NONLINEAR ELASTIC FOUNDATIONS

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Acta Mechanica Solida Sinica 2008年第2期21卷 170-176页

作者： Qin Qian Lin Wang qiao ni Department of Mechanics Huazhong University of Science and Technology Wuhan 430074 China

The nonlinear responses of planar motions of a fluid-conveying pipe embedded in nonlinear elastic foundations are investigated via the differential quadrature method discretization （DQMD） of the governing partial differential equation. For the analytical model, the effect of the nonlinear elastic foundation is modeled by a nonlinear restraining force. By using an iterative algorithm, a set of ordinary differential dynamical equations derived from the equation of motion of the system are solved numerically and then the bifurcations are analyzed. The numerical results, in which the existence of chaos is demonstrated, are presented in the form of phase portraits of the oscillations. The intermittency transition to chaos has been found to arise.

关键词： fiuid-conveying pipe nonlinear elastic foundation chaotic motion bifurcation differential quadrature method discretization (DQMD)

气相色谱法测定α-蒎烯、α-环氧蒎烷和马鞭草烯醇

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应用化工 2024年第4期53卷 978-981页

作者：赖芳黄麒霖陈华添罗俏妮广西大学化学化工学院广西南宁530004

为了准确定量分析α-蒎烯的氧化产物,采用了气相色谱法同时检测α-蒎烯,α-环氧蒎烷及马鞭草烯醇。结果表明,三种化合物在气相色谱柱中的分离效果良好。测得α-蒎烯,α-环氧蒎烷及马鞭草烯醇的标准曲线方程分别为Y_(1)=6×10^(8)X_(1)-2... 详细信息

为了准确定量分析α-蒎烯的氧化产物,采用了气相色谱法同时检测α-蒎烯,α-环氧蒎烷及马鞭草烯醇。结果表明,三种化合物在气相色谱柱中的分离效果良好。测得α-蒎烯,α-环氧蒎烷及马鞭草烯醇的标准曲线方程分别为Y_(1)=6×10^(8)X_(1)-253 848,Y_(2)=5×10^(8)X_(2)-174 421,Y_(3)=6×10^(8)X_(3)-171 424,相关系数R~2>0.999。且质量浓度分别在区间1.996~19.964 mg/mL;1.007~10.072 mg/mL;0.987~9.868 mg/mL内呈稳定的线性关系。加标回收率在97.76%~103.80%之间。相对标准偏差(RSD)在0.40%~3.04%之间。样品的α-蒎烯,α-环氧蒎烷和马鞭草烯醇的RSD在0.63%~3.43%之间。气相色谱法可以直接进样,同时检测α-蒎烯的氧化产物,为α-蒎烯的氧化分析提供了便捷且准确的方法。

关键词： α-蒎烯 α-环氧蒎烷马鞭草烯醇气相色谱法

MODELING AND DYNAMICS ANALYSIS OF SHELLS OF REVOLUTION BY PARTIALLY ACTIVE CONSTRAINED LAYER DAMPING TREATMENT

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Acta Mechanica Solida Sinica 2013年第5期26卷 468-479页

作者： qiao ni Yu Xiang Yuying Huang Jing Lu College of Civil Engineering and Mechanics Huazhong University of Science and Technology Department of Automotive Engineering Guangxi University of Technology

A new model for a smart shell of revolution treated with active constrained layer damping （ACLD） is developed, and the damping effects of the ACLD treatment are discussed. The motion and electric analytical formulation of the piezoelectric constrained layer are presented first. Based on the authors~ recent research on shells of revolution treated with passive constrained layer damping （PCLD）, the integrated first-order differential matrix equation of a shell of revolution partially treated with ring ACLD blocks is derived in the frequency domain. By virtue of the extended homogeneous capacity precision integration technology, a stable and simple numerical method is further proposed to solve the above equation. Then, the vibration responses of an ACLD shell of revolution are measured by using the present model and method. The results show that the control performance of the ACLD treatment is complicated and frequency-dependent. In a certain frequency range, the ACLD treatment can achieve better damping characteristics compared with the conventional PCLD treatment.

关键词： active constrained layer damping (ACLD) shell of revolution integrated first-orderdifferential matrix equation control performance damping characteristics

Natural Frequency and Stability Tuning of Cantilevered CNTs Conveying Fluid in Magnetic Field

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Acta Mechanica Solida Sinica 2016年第6期29卷 567-576页

作者： Lin Wang Yuanzhuo Hong Huliang Dai qiao ni Department of Mechanics Huazhong University of Science and Technology Wuhan 430074 China Hubei Key Laboratory for Engineering Structural Analysis and Safety Assessment Wuhan 430074 China

This paper investigates the dynamics of cantilevered CNTs conveying fluid in lon- gitudinal magnetic field and presents the possibility of controlling/tuning the stability of the CNT system with the aid of magnetic field. The slender CNT is treated as an Euler-Bernoulli beam. Based on nonlocal elasticity theory, the equation of motion with consideration of magnetic field effect is developed. This partial differential equation is then discretized using the differen- tial quadrature method （DQM）. Numerical results show that the nonlocal small-scale parameter makes the fluid-conveying CNT more flexible and can shift the unstable mode in which flutter instability occurs first at sufficiently high flow velocity from one to another. More importantly, the addition of a longitudinal magnetic field leads to much richer dynamical behaviors of the CNT system. Indeed, the presence of longitudinal magnetic field can significantly affect the evolution of natural frequency of the dynamical system when the flow velocity is successively increased. With increasing magnetic field parameter, it is shown that the CNT system behaves stiffer and hence the critical flow velocity becomes higher. It is of particular interest that when the mag- netic field parameter is equal to or larger than the flow velocity, the cantilevered CNT conveying fluid becomes unconditionally stable, indicating that the dynamic stability of the system can be controlled due to the presence of a longitudinal magnetic field.

关键词： CNT conveying fluid dynamics frequency stability magnetic field