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Planning issues on linac-based stereotactic radiotherapy

World Journal of Clinical Cases 2022年第35期10卷 12822-12836页

作者： Yang-Yang Huang Jun Yang Yi-Bao Liu School of Nuclear Science and Engineering East China University of TechnologyNanchang 330013Jiangxi ProvinceChina Department of Radiotherapy The Second Affiliated Hospital of Zhengzhou UniversityZhengzhou 450014Henan ProvinceChina Department of Radiotherapy The Third Affiliated Hospital of Zhengzhou UniversityZhengzhou 450052Henan ProvinceChina

This work aims to summarize and evaluate the current planning progress based on the linear accelerator in stereotactic radiotherapy(SRT).The specific techniques include 3-dimensional conformal radiotherapy,dynamic conformal arc therapy,intensity-modulated radiotherapy,and volumetric-modulated arc therapy(VMAT).They are all designed to deliver higher doses to the target volume while reducing damage to normal tissues;among them,VMAT shows better prospects for *** paper reviews and summarizes several issues on the planning of SRT to provide a reference for clinical application.

关键词： Stereotactic radiotherapy Treatment technology Energy Isocenters Coplanar/noncoplanar fields calculation algorithm Multileaf collimator leaf width Flattening filter free mode Small field dosimetry Grid size

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Development of real-time laser-scanning system to detect tree canopy characteristics for variable-rate pesticide application

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International Journal of Agricultural and Biological Engineering 2017年第6期10卷 155-163页

作者： Cai Jichen Wang Xiu Song Jian Wang Songlin Yang Shuo Zhao Chunjiang College of Information and Electrical Engineering China Agricultural UniversityBeijing 100083China National Research Center of Intelligent Equipment for Agriculture Beijing 100097China Key Laboratory of Agri-informatics Ministry of AgricultureBeijing 100097China Beijing Key Laboratory of Intelligent Equipment Technology for Agriculture Beijing 100097China

Improving pesticide application efficiency is increasingly important in orchard *** this study,a laser-scanning system was designed to acquire gridding volumes of a tree to quantify the geometry characteristics of the tree canopy in real-time.A laser-scanning sensor mounted on a linear guide was utilized to measure the structure of a target tree canopy.A computer was used to receive measurement data from the laser scanner and obtain the movement distance of the laser-scanning sensor from a *** algorithm written with VC#program was designed to calculate gridding volumes of trees by recognizing valid measurement data from the laser *** evaluations were conducted on three kinds of regular objects,and the maximum relative errors of section volumes of the cuboid,triangular prism and cylinder objects were 3.3%,7.9%and 9.4%,respectively,which illustrated that the algorithm could calculate the section volumes in different parts of the objects with high accuracy.A conifer tree and an apple tree were chosen to verify detecting accuracy of the laser-scanning system at variable speeds and grid *** variation coefficients of total volumes for each kind of the tree were 0.078 and 0.041,respectively,which indicated that the laser-scanning system could be applied to provide the gridding volumes of different canopy densities in real-time with good reliability for guiding a variable-rate sprayer.

关键词： laser-scanning system sensor tree canopy variable-rate spray pesticide application efficiency gridding volumes calculation algorithm

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Cooling of Granules in Vibrating, Suspended Bed: Engineering Simulation

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Modern Mechanical Engineering 2016年第2期6卷 76-90页

作者： Valery Katz Slava Katz SCE—Sami Shamoon College of Engineering Beer-Sheva Israel

Here we suggest an algorithm for calculation of the process parameters and design of a vertical cooler with inclined, gas-permeable blades and with a vibrating, suspended layer of granules on them (Vibrating Fluidized Bed—VFB). The algorithm is based on the use of the equations of heat and material balance, taking into account the influx of moisture into the layer with cold air and dust—as a carryover. Mode entrainment of dust particles and moisture from the VFB is described by using empirical formulas and Π-theorem. To calculate the cooling time of granules a model of the dynamics of a variable mass VFB was built, which linked the geometrical and physical process parameters to a single dependency. An example showed that mass flow of granules of 248 kg/h and a volume flow of air of 646 m3/h with temperature of 30℃ to cool the zeolite granules from 110℃ to 42℃ for 49 s required a vertical apparatus of rectangular shape with four chambers and with volume of 0.2 m3. A comparative analysis of technological parameters of the projected cooler with the parameters of typical industrial apparatuses showed that for all indicators: the cooling time of granules, the flow rate of gas (air) and the heat flow, a 4-chambered, vertical apparatus of rectangular shape with VFB was the most effective.

关键词： Cooling of Granules Vibrating Fluidized Bed Mathematical Model calculation algorithm

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