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Dynamic soil-tunnel interaction in layered half-space for incident plane SH waves

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Earthquake Engineering and Engineering Vibration 2016年第4期15卷 715-727页

作者： Fu Jia Liang Jianwen qin lin State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin University Department of Civil Engineering Tianjin University

The dynamic soil-tunnel interaction is studied by indirect boundary element method （IBEM）, using the model of a rigid tunnel in layered half-space, which is simplified to a single soil layer on elastic bedrock, subjected to incident plane SH waves. The accuracy of the results is verified through comparison with the analytical solution. It is shown that soil-tunnel interaction in layered half-space is larger than that in homogeneous half-space and this interaction mechanism is essentially different from that of soil-foundation-superstructure interaction.

关键词： underground tunnel layered half-space plane SH wave indirect boundary element method soil-tunnel interaction site dynamic characteristics

The application of nitric oxide delivery in nanoparticle-based tumor targeting drug delivery and treatment

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Asian Journal of Pharmaceutical Sciences 2019年第4期14卷 380-390页

作者： lin qin Huile Gao Key Laboratory of Drug Targeting and Drug Delivery System of the Education Ministry Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology West China School of Pharmacy Sichuan University

Nitric oxide(NO) shows great role in tumor biology. Recent years, more and more researches utilized NO donor in tumor targeting drug delivery and treatment. In this review, we summarized the NO donors by their endogenous and exogenous stimuli. Then the application of NO donors, which was the main aim of the review, was discussed in detailed according to their functions, including inducing tumor cell apoptosis, reversing tumor multidrug resistance, inhibiting tumor metastasis and improving drug delivery.

关键词： Nitric oxide donor Multidrug resistance Tumor metastasis Enhanced permeability and retention effect

Microclimate control to increase productivity and nutritional quality of leafy vegetables in a cost-effective manner

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International Journal of Agricultural and Biological Engineering 2022年第3期15卷 55-61页

作者： Jie He lin qin National Institute of Education Nanyang Technological University637616Singapore

Food security is one of the key global challenges in this *** Singapore,our research team has been using novel aeroponic technology to produce fresh vegetables since *** systems allow for year-round production of not only tropical,but also sub-tropical and temperate fresh vegetables,by simply cooling the roots suspended in aeroponic systems while the aerial parts grow under tropical ambient *** has also been used to investigate the impacts of root-zone CO_(2)on vegetables by enriching root-zone CO_(2)while their aerial portions were subjected to constant atmospheric CO_(2).To compensate for the lack of available land,Singapore also needs to develop a farming system that can increase productivity per unit land area by *** the past 10 years,my research team has established a commercially viable LED integrated vertical aeroponic farming system to grow different leafy vegetables under different LED spectra,intensities,and durations in the tropical *** results demonstrate that it is possible to increase shoot production and rate of shoot production of leafy vegetables by increasing light intensity and extending the photoperiod under effective LED ***,temperate vegetable crops such as lettuce were able to acclimate to high light intensity under supplementary LED lights to natural sunlight in the *** LED lightings promote both leaf initiation and expansion with increased photosynthetic pigments,higher Cyt b6f and Rubisco protein contents on a per area basis and thus improve photosynthetic capacity and enhance *** sense and respond to changes in their immediate environments(microclimate),manipulating the root zone temperature(RZT)and water supply will impact not only their growth and development but also their nutritional *** on-going research aims to investigate if the nutritional quality of leafy vegetables could be improved under suboptimal RZT and mild water

关键词： leaf vegetables LED lighting microenvironment nutrient spraying intervals nutritional quality photosynthetic performance productivity root-zone temperature

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)

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

Intercalation of Epinephrine with Calf-thymus ds-DNA

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Chinese Chemical Letters 2001年第7期12卷 619-622页

作者： Sai Jing ZHENG Xiang qin lin Department of Chemistry University of Science and Technology of ChinaHefei 230026

A strong interaction between double stranded calf-thymus DNA (ds-DNA) and epinephrine but no interaction between single stranded calf-thymus DNA (ss-DNA) and epinephrine were observed by the use of UV-spectroscopy and cyclic voltammetry. It is suggested that the interaction leads to an intercalation of EP molecules into the groove of ds-DNA and the formation of ds-DNA(EP)(n) complex.

关键词： DNA epinephrine UV-visible spectroscopy cyclic voltammetry

THEORY AND APPLICATION OF WAVELET ANALYSIS INSTRUMENT LIBRARY

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Chinese Journal of Mechanical Engineering 2006年第3期19卷 464-467页

作者： BO lin qin Shuren LIU Xiaofeng College of Mechanical Engineenng Chongqing University Chongqing 400044 China

Some new theory and algorithms on wavelet analysis are proposed, including continuous wavelet transform （CWT）, discrete wavelet transform （DWT）, wavelet package transform （WPT）, wavelet denosing and mother wavelet selection, etc. Using the component-based hierarchy mode, the platform for virtual instrument （VI） is constructed, and the functions such as data sampling, data analysis and data present, etc are provided. Subsequently, the wavelet analysis library is designed and developed. The library consists of expert system, experienced database, development platform and abundant wavelet analysis functional module, which together implement general and special wavelet analysis in the field of mechanical engineering, energy source, transportation and biomedicine, etc. Finally, the wavelet analysis virtual instrument library is applied to detect fault called engine knock. Experimental result indicates that the wavelet analysis virtual instrument library can efficiently solve the engineering problem such as detecting engine knock.

关键词： Wavelet analysis Virtual instrument library Engine knock

The In-cell iR Compensation Using a Four-electrode System

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Chinese Chemical Letters 2006年第5期17卷 703-706页

作者： Xiang qin lin Liang Dong FENG University of Science and Technology of China Hefei 230026

A novel idea of in-cell iR compensation was proposed by using a four-electrode electrochemical system, which was consisted of two working electrodes, one reference electrode （RE） and one auxiliary electrode （AE）. One of the two working electrodes was called the auxiliary working electrode （AWE）, which was directly connected to the ground. Another working electrode was used as a regular working electrode （WE） for electrochemical testing. The reference electrode was set in a frit close to the AWE for potential sampling. The other electrodes, WE, RE and AE, were connected to a conventional potentiostat of three-electrode system for electrochemical measurements. A linear narrow electrochemical cell was designed for setting AE at one end and AWE with RE at another end, and setting WE in between AE and AWE. In this way, a positive feedback potential was generated at the working electrode from the solution resistance and the current flow in the solution. An formal iR compensation over 100%, as high as 500%, had been achieved without potential oscillation. The electrochemical cell design, the principle of the in-cell iR compensation, and the preliminary voltammetric characterization by using the redox reaction of ferrocyanide anions were reported.

关键词： In-cell iR compensation four-electrode system cell design cyclic voltammetry.

A glass nanopore electrode for single molecule detection

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Chinese Chemical Letters 2010年第9期21卷 1115-1118页

作者： Guo Xia Li Xiang qin lin Department of Chemistry University of Science and Technology of ChinaHefei 230026China

We have developed a simple method for fabricating robust and low noise glass nanopore electrodes with pore size 10±5 nm to detect single molecules.β-Cyclodextrin was used as model compound for *** 1.0 mol/L NaCl solution,the molecules generated current pulses of 2-5 pA with noise level less than 0.8 pA.A slide mode and a plug mode were suggested for the way ofβ-cyclodextrin single molecule moving into the glass nanopores.

关键词： Glass nanopores Single molecule detecting β-Cyclodextrin