Xian Aeronautical College

Fengcheng, China

Xian Aeronautical College

Fengcheng, China

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Li X.,XiAn Aeronautical College | Luo G.,XiAn Aeronautical College | Yan J.,Mechanical and Electrical Engineering | Guo Y.,Xi'an Jiaotong University
2011 International Conference on Electric Information and Control Engineering, ICEICE 2011 - Proceedings | Year: 2011

This paper presents a MAX232 chip using AT89C51 Microcontroller to RS-232 Serial Communication, And RS-232 communication interface design can give about preparation robot of Xi'an Aeronautical College. Finally, giving the MAX232 chip test program. Through practice we proved that the program can meet the practical needs with low cost, anti-interference ability, and reliable performance. © 2011 IEEE.


Jin W.,Xi'an Technological University | Jin W.,Xian Aeronautical College | Zhang H.,Xi'an Technological University | He W.,Xi'an Jiaotong University
Paiguan Jixie Gongcheng Xuebao/Journal of Drainage and Irrigation Machinery Engineering | Year: 2010

A novel numerical method for simulating micro-scale flow field was established mainly by adopting porous medium model to simulate wall roughness elements. Thickness of porous media was converted by the wall relative roughness, and drag coefficient was determined by flow state as well as resistance of porous media. Under Reynolds number of 100 and 300 respectively, various models were applied to simulate the flow field of square-section micro-channel with side length of 600 μm. Comparison between results of simulation and those of Micro-PIV experiment indicated that, realizable k-ε turbulence model combining porous medium model was most effective for micro-channel flow field simulation, while standard k-ε turbulence model and RNG k-ε turbulence model gave results close to experimental ones with somehow deviations. However, standard k-ω turbulence model and SST k-ω turbulence model exhibited much poor capability in such micro-scale simulations.


Jin W.,Xi'an Technological University | Jin W.,Xian Aeronautical College | Zhang H.,Xi'an Technological University | He W.,Xi'an Jiaotong University
Yingyong Jichu yu Gongcheng Kexue Xuebao/Journal of Basic Science and Engineering | Year: 2011

Inflow field velocity distributions within micro-channels were measured by Micro-PIV technique. Deionized water seeded with 3μm-diameter fluorescent particles was introduced into micro-channel pipeline. The flow field was recorded by 14-bit CCD camera system combining 10-fold microscope. Under commercial CFD software Fluent, Realizable k-ε model with porous medium model, as which roughness elements of micro-channel wall was abstracted, was used to study on the micro channel having rectangular cross-section with side length of 600μm and 800μm, respectively, to acquire their velocity distribution under Re of 100 and 300. Compared with that of Micro-PIV experiment, the simulation result indicated that, Realizable k-ε model with porous medium model could effectively simulate fluid flow of micro-scales pipeline, in which porous medium's thickness was converted by relative roughness in the micro-scales, and porous medium's viscosity factor and inertia coefficient were determined by fluid state and resistance within porous medium.


He W.,Xi'an Jiaotong University | Wang Y.,Xi'an Jiaotong University | Gong X.,Xi'an Jiaotong University | Jin W.,Xian Aeronautical College
Paiguan Jixie Gongcheng Xuebao/Journal of Drainage and Irrigation Machinery Engineering | Year: 2011

To investigate inflow fields in Micro-channel at Reynolds number lower than 1, such as inflow in vascular plant, with micro-fluidic particle image velocimetry (Micro-PIV) technique and numerical simulation that simulating wall roughness elements by setting up porous medium thickness and momentum source of porous medium model in software Fluent, inflow fields in straight micro-channels with cross section of 400 μm×400 μm under the conditions of the Reynolds number of 0.15, 0.25 and 0.35 were obtained respectively. The velocity distributions were compared with analytical solution adopted by solving governing equations directly. The result shows that effect from wall roughness on the velocity distributions is small but not ignorable in micro-channel, so the analytical solution cannot meet the experimental results. The profile has the same tendency, but the value is lower in the mean flow area, which is distant from horizontal axis less than 0.04 mm, and higher in other region near the wall. Velocity distributions derived by the numerical simulation meet the experimental results well, so this numerical simulation can be successfully used in handling inflow problems at low Reynolds number in square section straight micro-channel.


Zhao Z.,Northwestern Polytechnical University | He H.,Xian Aeronautical College | Ding J.-P.,Northwestern Polytechnical University
Beijing Youdian Daxue Xuebao/Journal of Beijing University of Posts and Telecommunications | Year: 2012

A passive monitoring model of P2P specific information based on data verify algorithm is presented. Taking P2P specific information as the object, A two-dimensional Bloom Filter algorithm is used to verify data as the judgment reference. To analyze two-dimensional Bloom Filter algorithm's time performance, space performance and misjudgment rate, the algorithm compensates the current data verify algorithm's defect of taking more memory space and with low efficiency. Two-dimensional Bloom Filter algorithm can meet the performance requirement of passive monitoring model to data verify algorithm.


Jin W.,Xi'an Technological University | Jin W.,Xian Aeronautical College | Zhang H.-Y.,Xi'an Technological University | He W.-B.,Xi'an Technological University
Shiyan Liuti Lixue/Journal of Experiments in Fluid Mechanics | Year: 2010

Using micro-fluidic particle image velocimetry (micro-PIV) technique, the paper investigated measurements for the square micro-channel with side lengths of 800μm. To attain distinct particle image, solve the problems of matching camera with PIV system and improve the image's signal-to-noise ratio, the research adopted 10x microscope, 14-bit CCD camera system, 3μm fluorescent particles and filter lens that only allow 610nm red light penetration. In the image processing, Brownian motion's impact on tracing particles was eliminated by the average of images. Using ensemble correlation arithmetic acquired velocity distribution and velocity streamline. The results show that jags' flow structure is basically consistent inside the micro-channel. The fully developed internal flow in the channel is a cycling movement. There exists low speed vortex area in the micro-channel's flat top and corner, whose vortex structure and size depend on time and Reynolds number. The particles are vulnerable to deposit in the low-speed vortex area, which proves the main factor for block.


Wu Q.,Xian Aeronautical College
Acta Crystallographica Section E: Structure Reports Online | Year: 2011

The title compound, K[B5O7(OH)2], was obtained from a hystructure is composed of one K+ cation and a polyborate ∞1[B5O7(OH)2] - anion, which consists of two six-membered rings linked by a common BO4 tetra-hedron. The [B5O7(OH) 2]- units are linked together through two exocyclic O atoms to neighbouring units, forming a helical chain structure extending parallel to [010]. Adjacent chains are further connected into a three-dimensional structure by K - O bonds and weak O - H⋯O hydrogen-bond interactions. © Qi Wu 2011.


Jin W.,Xi'an Technological University | Jin W.,Xian Aeronautical College | Zhang H.,Xi'an Technological University
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2010

For exploring the flowing rule and the clogging mechanism of the micro-irrigation emitter, Micro-PIV technology was adopted to detect and compare the inner flowing hydraulic movement of squared cross section of straight angled and round angled zigzag profile in the micro-scale channels when Re (reynolds number)was 200. Clear images of particles were obtained by combining 10x microscope, 14-digit grey scale PCO1600 camera, 3 μm fluorescence tracer particles and light filtering lens allowing 610 nm red light permeation. The flow field velocity vector patterns and streamlined diagrams of high resolution were obtained by using image processing techniques. Experiments exposed that the inner flow of tooth space in the micro-channels was proved to be cycled flow after fully development. For the more, low velocity vortex cavities existed in the vertex angle and inner side of bend angle of straight angle micro-channel, while back flow only appeared in the internal side of bend angle of round angle micro-channel. It's easy to take place deposition in the low velocity vortex cavities, which is the main cause of blocking. The low velocity vortex cavities were expanded and the back-flowing tendency appeared in the turning point of vertex angle if the section was narrowed, which had a negative impact on anti-blocking.


Jin W.,Xi'an Technological University | Jin W.,Xian Aeronautical College | Zhang H.,Xi'an Technological University
Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery | Year: 2010

On the basis of micro-scales flow field detected by Micro-PIV experiment, Fluent numerical analytic computing software was utilized to design the optimum micro-scales flow simulating plan. In accordance with features of micro-scales, the micro-scales effect manipulating approaches setting wall roughness element and the porous medium simulating wall roughness element was adopted during the design. In the experiment, using realizable kε model and standard kω model provided by Fluent software, the relative numerical simulations on the rectangle cross section micro-scales water flowing with side length of 600μm in the case of Re=100 and Re=300 was done. With the comparison of velocity field computed from various numerical analyses and the fitting degree of Micro-PIV experimental outcome, the optimum plan that designing case via the porous medium simulating wall roughness element under the solution of realizable kε was acquired.


PubMed | Xian Aeronautical College
Type: Journal Article | Journal: Acta crystallographica. Section E, Structure reports online | Year: 2012

The title compound, K[B(5)O(7)(OH)(2)], was obtained from a hydro-thermal reaction. The structure is composed of one K(+) cation and a polyborate (1) ()[B(5)O(7)(OH)(2)](-) anion, which consists of two six-membered rings linked by a common BO(4) tetra-hedron. The [B(5)O(7)(OH)(2)](-) units are linked together through two exocyclic O atoms to neighbouring units, forming a helical chain structure extending parallel to [010]. Adjacent chains are further connected into a three-dimensional structure by K-O bonds and weak O-HO hydrogen-bond inter-actions.

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