Research on the Construction of the High-efficiency Modern Agricultural Demonstration Park

Lilei Zhang,Shaowei Zhang,Lifang Qiao 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.3

The high-efficiency modern agricultural demonstration park is a new development mode of Chinese agriculture, and plays a very important role in promoting agricultural development. This paper establishes the framework of the modern high-efficiency agricultural demonstration park from six aspects, namely, development orientation, function composition, comprehensive planning, smart construction, standardized construction and innovation construction. The results show that these aspects are influenced by several factors or set up by several modules, and form the symbiotic network of the park. Positioning realistic development targets, arranging function division, allocating infrastructure, and integrating smart, standardized & innovative technologies will ultimately enhance the ecological, economic and social benefits of the park.

Adsorption separation of vinyl chloride and acetylene on activated carbon modified by metal ions

Song Jiang,Gongying Wang,Tong Chen,Lilei Zhang 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4

This work mainly involved the adsorption separation of vinyl chloride and acetylene on modified activated carbons. Six metal ions with different hardness were loaded on activated carbon respectively. The effect of metal ions on the adsorption separation performance of vinyl chloride and acetylene was investigated. The experimental results shown that the separation factor of C2H3Cl to C2H2 over modified activated carbon followed the order: Al(III)/AC > Mg(II)/AC > Fe(III)/AC > AC > Zn(II)/AC Cu(II)/AC > Ag(I)/AC. The effect of the hardness of metal ions on the adsorption capacity of C2H2 was more remarkable than that of C2H3Cl, thus the separation factor of C2H3Cl to C2H2 increased with the rising of absolute hardness of the metal ions.

Comparison of Pre-Operation Diagnosis of Thyroid Cancer with Fine Needle Aspiration and Core-needle Biopsy: a Meta-analysis

Li, Lei,Chen, Bao-Ding,Zhu, Hai-Feng,Wu, Shu,Wei, Da,Zhang, Jian-Quan,Yu, Li Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.17

Background: The aim of this meta-analysis was to compare sensitivities and specificities of fine needle aspiration (FNA) and core needle biopsy (CNB) in the diagnosis of thyroid cancer. Materials and Methods: Articles were screened in Medline, the Cochrane Library, EMBASE and Google Scholar, and subsequently included and excluded based on the patient/problem-intervention-comparison-outcome (PICO) principle. Primary outcome was defined in terms of diagnostic values (sensitivity and specificity) of FNA and CNB for thyroid cancer. Secondary outcome was defined as the accuracy of diagnosis. Compiled FNA and CNB results from the final studies selected as appropriate for meta-analysis were compared with cases for which final pathology diagnoses were available. Statistical analyses were performed for FNA and CNB for all of the selected studies together, and for individual studies using the leave-one-out approach. Results: Article selection and screening yielded five studies for meta-analysis, two of which were prospective and the other three retrospective, for a total of 1,264 patients. Pooled diagnostic sensitivities of FNA and CNB methods were 0.68 and 0.83, respectively, with specificities of 0.93 and 0.94. The areas under the summary ROC curves were 0.905 (${\pm}0.030$) for FNA and 0.745 (${\pm}0.095$) for CNB, with no significant difference between the two. No one study had greater influence than any other on the pooled estimates for diagnostic sensitivity and specificity. Conclusions: FNA and CNB do not differ significantly in sensitivity and specificity for diagnosis of thyroid cancer.

Study on the micro-scale simulation of wind field over complex terrain by RAMS/FLUENT modeling system

Li, Lei,Zhang, Li-Jie,Zhang, Ning,Hu, Fei,Jiang, Yin,Xuan, Chun-Yi,Jiang, Wei-Mei Techno-Press 2010 Wind and Structures, An International Journal (WAS Vol.13 No.6

A meteorological model, RAMS, and a commercial computational fluid dynamics (CFD) model, FLUENT are combined as a one-way off-line nested modeling system, namely, RAMS/FLUENT system. The system is experimentally applied in the wind simulation over a complex terrain, with which numerical simulations of wind field over Foyeding weather station located in the northwest mountainous area of Beijing metropolis are performed. The results show that the method of combining a meteorological model and a CFD model as a modeling system is reasonable. In RAMS/FLUENT system, more realistic boundary conditions are provided for FLUENT rather than idealized vertical wind profiles, and the finite volume method (FVM) of FLUENT ensures the capability of the modeling system on describing complex terrain in the simulation. Thus, RAMS/FLUENT can provide fine-scale realistic wind data over complex terrains.

High-performance solid-state flexible supercapacitor based on reduced graphene oxide/hierarchical core-shell Ag nanowire@NiAl layered double hydroxide film electrode

Li, Lei,Hui, Kwan San,Hui, Kwun Nam,Zhang, Tengfei,Fu, Jianjian,Cho, Young-Rae Elsevier 2018 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.348 No.-

<P><B>Abstract</B></P> <P>All-solid-state flexible supercapacitor (AFSC) is a promising energy storage device due to its high flexibility, security, and environmental friendliness. However, high electrical resistance and low specific capacitance of electrodes limit its application for potential portable electronic devices. In this study, we design a novel hybrid film electrode composed of reduced graphene oxide (rGO)/silver nanowire (Ag NW)@nickel aluminum layered double hydroxide (NiAl LDH; herein, GAL) possessing high electrochemical performance by using hydrothermal and vacuum filtration techniques. The Ag NW@NiAl LDH (AL) composites with hierarchical core-shell structure are utilized to increase electroactive surface area and improve electrical conductivity, while the rGO nanosheets serve as a prominent carbon material with outstanding electrical conductivity and mechanical flexibility. The freestanding GAL electrode shows high specific capacitance of 1148 F g<SUP>−1</SUP> at 1 A g<SUP>−1</SUP> compared with rGO/NiAl LDH (GL) of 765.2 F g<SUP>−1</SUP> at 1 A g<SUP>−1</SUP>. Furthermore, the bind-free symmetric AFSC device is successfully prepared using GAL hybrid film as electrodes and PVA-KOH as solid-state gel electrolyte. The GAL//GAL AFSC device delivers a superior specific capacitance of 127.2 F g<SUP>−1</SUP> at 1 A g<SUP>−1</SUP>, a high energy density of 35.75 mWh cm<SUP>−3</SUP> at a power density of 1.01 W cm<SUP>−3</SUP>, and great cycling ability of 83.2% over 10,000 cycles at 5 A g<SUP>−1</SUP>. This study introduces a novel design of flexible electrode structure for advanced energy storage applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A well-designed rGO/Ag NW@NiAl-LDH (GAL) hybrid film was prepared. </LI> <LI> The Ag NWs improved the conductivity of the hybrid film. </LI> <LI> The GAL electrode shows high specific capacitance of 1148 F g<SUP>−1</SUP>. </LI> <LI> The flexible device displays high energy density of 35.75 mWh cm<SUP>−3</SUP>. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Numerical Simulation and Experimental Research of the Flow Coefficient of the Nozzle-Flapper Valve Considering Cavitation

Li, Lei,Li, Changchun,Zhang, Hengxuan Korean Society for Fluid machinery 2017 International journal of fluid machinery and syste Vol.10 No.2

The nozzle-flapper valves are widely applied as a pilot stage in aerospace and military system. A subject of the analysis presented in this work is to find out a reasonable range of null clearance between the nozzle and flapper. This paper has presented a numerical flow coefficient simulation. In every design point, a parameterized model is created for flow coefficient simulation and cavitation under different conditions with varying gap width and inlet pressure. Moreover, a new test device has been designed to measure the flow coefficient and for visualized cavitation. The numerical simulation and test results both indicate that cavitation intensity gets fierce initially and shrinks finally as the gap width varies from small to large. From the curve, the flow coefficient mostly has experienced three stages: linear throttle section, transition section and saturation section. The appropriate deflection of flapper is recommended to make the gap width drop into the linear throttle section. The flapper-nozzle null clearance is optionally recommended near the range of $D_N/16$. Finally through simulation it is also concluded that the inlet pressure plays a little role in the influence on the flow coefficient.

Finite-time Bipartite Synchronization of Complex-valued Complex Networks with Time Delay

Li Lei,Degang Yang,Tao Liang,Wanli Zhang 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.6

Based on the framework of signed graphs, we investigate finite-time bipartite synchronization (FTBS) of delayed complex-valued complex networks (DCVCN) in this paper. Several control strategies with quantizer are designed, which can save communication resources. 1-norm analytical techniques are used and developed to present strict proof of theoretical results. Some FTBS criteria are established by use of multiple Lyapunov functions, and the settling time is estimated by means of control parameters and initial values. Numerical simulation results are given to verify the validity of theoretical analysis.