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Shiqiang Xu,Junhe Wang,Hongying Lin,Rongchao Li,Yongqiang Cheng,Shengbo Sang,Kai Zhuo 대한금속·재료학회 2022 ELECTRONIC MATERIALS LETTERS Vol.18 No.6
ZnO/NiO heterojunction nanofibers were synthesized by an electrostatic spinning technique in thiswork. The morphologies, crystal structures, and compositional features of the ZnO/NiO nanofiberswere analyzed by SEM, TEM, XRD, and EDS characterization. ZnO/NiO nanofibers with Zn contentsof 37.5 at% showed a 46% response to 300-ppm ammonia gas at room temperature (25 ± 1 ℃;56 ± 3% RH), with fast response and recovery behavior (100 s /25 s). The existence of p-n heterojunctionson the surface of ZnO/NiO nanofibers, as well as surface ionic conduction, improved the responseto ammonia gas in a synergistic manner.
A Study on Construction and Simulation of Agricultural Machinery System Control Model
Wang Ying,Xu Shiyang,Liu Shiqiang,Li Xiaoxue,Ao Changlin 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.8
In order to study the state-changing and running rules of agricultural machinery system, this paper establishes the control model of agricultural machinery system under the discrete-state space based on control theory, from the perspective of the complex systems and with reference to the actual conditions of agricultural production; conducts the qualitative analysis on the system model, builds the relevant simulation model of agricultural machinery system accordingly, and verifies the running of the simulation model. This control model can provide effective basis and reference for further quantitative studies on state evolution of agricultural machinery system.
A new description of the fractal dimension of particle aggregates in liquid medium
Xing, Jun,Ding, Shiqiang,Liu, Zhengning,Xu, Jirun Korean Association for Particle and Aerosol Resear 2015 Particle and Aerosol Research Vol.11 No.4
The possible existence forms of particle aggregates in liquid medium are classified into four different types according to their morphological characteristics, including the single particles that are separated from each other, the linear aggregates in which all component particles are located in a line, the planar aggregates where all particles are arranged on a plane, and the volumetric aggregates where all particles forms a three-dimensional space. These particle aggregates with different space morphologies have different fractal dimensions and different influence on the rheological phenomena of the solid-liquid system. The effects of various aggregates on the suspension viscosity are analyzed and related with the particle concentration, and then a mathematical model is presented to determine the fractal dimensions of various aggregates by measuring the apparent viscosity of the solid-liquid system. In the model, the viscous fractal dimension is developed as a new concept, the fractal dimensions of different aggregates can be obtained separately and then the relative components of various aggregates experimentally analyzed.
Shaogan Ye,Junhui Zhang,Bing Xu,Wei Song,Long Chen,Haiyong Shi,Shiqiang Zhu 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.9
Erosion damage affects the reliability and durability of axial piston pumps. An axial piston pump was tested using endurance life testing method. The phenomenon of erosion damage on the valve plate was observed using a confocal laser scanning microscope, by comparing the surface on the valve plate before and after the endurance life testing. A CFD turbulence model inclusive of the cavitation effects was developed to predict the flow physics. The flow physics in the axial piston pump were presented and analyzed, including the fluid velocities, velocity fields, the total volume fraction fields of gas and vapor, and pressure fields. Two causes of erosion damage were found, the appearances of large amount of vapor, and directly hitting by the jetting flow. The first one is the cause of erosion damage on the surface near the transition region from the inlet port to the outlet port, and the second one is the cause of erosion damage on the surface near the transition region from the outlet port to the inlet port. Besides, the findings show that the fluid velocities closely relate to the area of erosion damage. The study provides insights into the occurrence of erosion damage in axial piston pumps.