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Propagation properties of radially polarized Pearcey–Gauss vortex beams in free space

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Chinese Physics B 2020年第6期29卷 171-178页

作者： Xinpeng Chen Chuangjie Xu Qian Yang zhiming luo Xixian Li Dongmei Deng Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices South China Normal UniversityGuangzhou 510631China School of Physics Sun Yat-Sen UniversityGuangzhou 510275China

We investigate a family of radially polarized Pearcey–Gauss vortex beams(RPPGVBs),obtain the general propagation expressions of an RPPGVB,and study the intensity distribution,phase pattern,spin currents as well as the orbital currents when the RPPGVB propagates in free *** focal plane and the intensity of the focal point can be adjusted by changing the position of the vortex and the scaling *** also investigate how the waist size influences the propagation properties.

关键词： Pearcey-Gauss beam propagation properties

Digital light processing 3D printing for microfluidic chips with enhanced resolution via dosing-and zoning-controlled vat photopolymerization

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Microsystems & Nanoengineering 2023年第4期9卷 315-327页

作者： zhiming luo Haoyue Zhang Runze Chen Hanting Li Fang Cheng Lijun Zhang Jia Liu Tiantian Kong Yang Zhang Huanan Wang School of Biomedical Engineering Shenzhen University Health Science CenterShenzhen 518000P.R.China State Key Laboratory of Fine Chemicals Frontiers Science Center for Smart Materials Oriented Chemical EngineeringSchool of BioengineeringDalian University of TechnologyDalian 116024P.R.China Third People’s Hospital of Dalian Dalian Eye HospitalDalian 116024 P.R.China Central Laboratory The Second Affiliated Hospital of TheChinese University of Hong KongShenzhen 518172P.R.China

Conventional manufacturing techniques to fabricate microfluidic chips,such as soft lithography and hot embossing process,have limitations that include difficulty in preparing multiple-layered structures,cost-and labor-consuming fabrication process,and low *** light processing(DLP)technology has recently emerged as a costefficient microfabrication approach for the 3D printing of microfluidic chips;however,the fabrication resolution for microchannels is still limited to sub-100 microns at ***,we developed an innovative DLP printing strategy for high resolution and scalable microchannel fabrication by dosing-and zoning-controlled vat photopolymerization(DZC-VPP).Specifically,we proposed a modified mathematical model to precisely predict the accumulated UV irradiance for resin photopolymerization,thereby providing guidance for the fabrication of microchannels with enhanced *** fine-tuning the printing parameters,including optical irradiance,exposure time,projection region,and step distance,we can precisely tailor the penetration irradiance stemming from the photopolymerization of the neighboring resin layers,thereby preventing channel blockage due to UV overexposure or compromised bonding stability owing to insufficient resin ***,this strategy can allow the preparation of microchannels with cross-sectional dimensions of 20μm×20μm using a commercial printer with a pixel size of 10μm×10μm;this is significantly higher resolution than previous *** addition,this method can enable the scalable and biocompatible fabrication of microfluidic drop-maker units that can be used for cell *** general,the current DZC-VPP method can enable major advances in precise and scalable microchannel fabrication and represents a significant step forward for widespread applications of microfluidics-based techniques in biomedical fields.

关键词： printing resolution resin

An Investigation of Crocidolite Contamination and Mesothelioma in a Rural Area of China^1

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Biomedical and Environmental Sciences 1990年第2期3卷 156-165页

作者： LIU XUEZE, luo SUQIONG, WANG zhiming, WANG MIANZHEN, AND ZHAN CHENGLIE Department of Occupational Health, School of Public Health, West China University of Medical Sciences, Chengdu. Sichuan. China Department of Occupational Health School of Public Health West China University of Medical Sciences Chengdu Sichuan.

Crocidolite was found to be ubiquitous in a county in southwestern China. It had been widely used in the making of road pavement, stoves, wall paint, etc. The environmental levels of the asbestos fibers were determined. Of the 2175 local residents examined. 16 had asbestosis and 232 had pleural plaques. These clinical manifestations were noted mainly in patients over 50 years of age. (c)1990 Academic Press. Inc.

关键词： An Investigation of Crocidolite Contamination and Mesothelioma in a Rural Area of China~1

The Occurrence,Damage and Control Strategies of Sugarcane Borers in Yunnan

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Agricultural Biotechnology 2018年第3期7卷 106-109页

作者： Wenfeng LI Hongli SHAN Rongyue ZHANG Xiaoyan WANG Jiong YIN zhiming luo Yingkun HUANG Sugarcane Research Institute Yunnan Province Academy of Agricultural Science

Sugarcane borers are the most common pests in Yunnan sugarcane areas,and their harm is the most serious presently. The damage caused by sugarcane borers has become the first important factor seriously influencing the sustainable and stable development of sugar industry in Yunnan. To scientifically and effectively prevent and control sugarcane borers to ensure the production safety of sugarcane,the characteristics of occurrence and damage of sugarcane borers in Yunnan sugarcane areas were systematically introduced,and corresponding comprehensive control measures and strategies were proposed according to the characteristics of its occurrence and damage and the actual production of sugarcane.

关键词： Yunnan sugarcane areas Sugarcane borers Occurrence and damage Control nleasures

Geostatistical Analysis of Spatial Distribution and Dynamics of Dead Heart of Sugarcane Seedlings Caused by Borer

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Agricultural Science & Technology 2017年第4期18卷 637-641页

作者： zhiming luo Jiong YIN Wenfeng LI Rongyue ZHANG Hongli SHAN Xiaoyan WANG Yingkun HUANG Institute of Sugarcane Research Yunnan Academy of Agricultural Sciences

Dead heart of sugarcane is an important symptom caused by borer attack. In the present study, the spatial distribution and dynamics of dead heart of sugarcane in the field were investigated based on geostatistical analysis, and semivariograms were computed in four separate directions(0°, 45°, 90° and 135°) and fitted with various theoretical models to determine the best fitted one. The Ordinary Kriging was used to interpolate spatial data. The results revealed that the density of dead hearts of sugarcane increased in a single-peak pattern, and the degree of spatial aggregation and random variation both decreased with the increase in the density of dead heart. In addition, dead heart of sugarcane caused by borer exhibited spatial *** the increase in the density of dead heart, the degree of spatial aggregation decreased, while the correlation increased. Kriging interpolation indicated that the correlation between the spatial patches was weak in early seedling stage, and became strong in middle and late seedling stage.

关键词： Sugarcane Dead heart Geostatistics Spatial distribution and dynamics

Population Structure Dynamics and Control Countermeasures of Sugarcane Borers in Yunnan Sugarcane Area

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Plant Diseases and Pests 2018年第2期9卷 16-20页

作者： Li Wenfeng Zhang Rongyue Shan Hongli Yin Jiong luo zhiming Wang Xiaoyan Huang Yingkun Sugarcane Research Institute Yunnan Academy of Agricultural Sciences

To control sugarcane borers scientifically and effectively, the species, population structure and dynamics of sugarcane borers in Yunnan sugarcane areas were analyzed, based on the historical data and survey research. The distribution area and damage of the major sugarcane borers in Yunnan sugarcane areas were ascertained, and the factors influencing population structure dynamics of sugarcane borers and their rampant causes were revealed. According to the damaging characteristics of sugarcane borers, suitable control countermeasures were proposed, including establish-ing and improving sugarcane quarantine system, enhancing quarantine of imported varieties/clones, investigating new sugarcane borer populations thoroughly and systematically, establishing early warning and monitoring system, actively carrying out physical and biological control, and enhancing protection of natural enemies. These countermeasures could help to effectively control sugarcane borers and reduce the damage caused by these borers.

关键词： Yunnan sugarcane areas Sugarcane borers Population structure Occurrence dynamics Control countermeasures

Occurrence, Damage and Control Strategies of Major Pests, Diseases and Weeds in Sugarcane Areas of Lincang Nanhua Sugar Industry Co., Ltd.

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Plant Diseases and Pests 2018年第1期9卷 29-32,40页

作者： Li Wenfeng Shan Hongli Yin Jiong Zhang Rongyue luo zhiming Wang Xiaoyan Huang Yingkun Sugarcane Research Institute Yunnan Academy of Agricultural Science

The pests, diseases and weeds in sugarcane areas of Lincang Nanhua Sugar Industry Co.,Ltd. were investigated at seedling stage, growth stage and maturity stage of sugarcane from 2012 to 2016. The occurrence and damage of diseases, pests and weeds were analyzed, and the problems in prevention and control were discussed based on the local conditions of sugarcane production. The species, occurrence and damage characteristics of diseases, pests and weeds were ascertained, and the corresponding strategies and technical measures were proposed.

关键词： Lincang Nanhua Sugar Industry Co.,Ltd. Sugarcane Pests diseases and weeds Occurrence and damage Control strategies Technical measures

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声表面波谐振器回波信号的频率估计

电子与信息学报 2019年第9期41卷 2087-2094页

作者：刘伯权郭佳佳罗治民湘潭大学物理与光电工程学院

声表面波(SAW)谐振器测量技术能在高温、高压、强电磁辐射和强电磁干扰等恶劣环境下,实现无线无源的参数检测。针对声表面波谐振器回波信号的非平稳特点,该文提出一种回波信号的频率测量方法“数字频率有效位数跟进法”(DFSPT)。仿真结... 详细信息

声表面波(SAW)谐振器测量技术能在高温、高压、强电磁辐射和强电磁干扰等恶劣环境下,实现无线无源的参数检测。针对声表面波谐振器回波信号的非平稳特点,该文提出一种回波信号的频率测量方法“数字频率有效位数跟进法”(DFSPT)。仿真结果表明,该方法与现有的基于傅里叶变换法(FFT)和奇异值分解法(SVD)的方法相比,其能根据信噪比的不同,自行确定数字频率有效数字的位数,提高了频率估计的精度和稳定性。无线SAW温度传感器实验表明,该方法的频率估计标准差小,鲁棒性高。

关键词：声表面波回波信号数字频率有效数字频率估计

Evaluation of Control Effects against Sugarcane Pests：A New Sustained-release and Long-lasting Pesticide and Convenient and Efficient Pesticide Application Technology

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Plant Diseases and Pests 2017年第5期8卷 11-14页

作者： Li Wenfeng Pu Chunhua Zhang Rongyue Yin Jiong luo zhiming Shan Hongli Wang Xiaoyan Huang Yingkun Sugarcane Research Institute Yunnan Academy of Agricultural Sciences/Yunnan Provincial Key Laboratory of Sugarcane Genetic Improvement Kaiyuan 616699 China Yunnan Academy of Agricultural Science Kunming 650205 China

[Objective]The paper was to screen a new ideal sustained-release,long-lasting and low-toxic pesticide and convenient and efficient pesticide application technology for controlling Ceratovacuna lanigera and Baliathrips serratus. [Method]2% Imidacloprid GR were selected and applied in the soil for field efficacy trial. [Result] The optimum dosage of 2% imidacloprid GR was 30 kg/hm^2（ active ingredient 600 g）,which can be mixed with fertilizer（ 30 kg pesticide and 40-80 kg fertilizer per hm^2） once combined with sugarcane planting management or big ridging during February and June. The control effects against C. lanigera and B. serratus could be more than 98. 2% and 81. 1%,respectively. The actual yield and sugar content in various pesticide treatments were increased by 33 390 kg/hm^2 and 6. 6% respectively compared to blank control. [Conclusion]2% imidacloprid GR has good control effects on C. lanigera and B. serratus. It is a new pesticide with ideal sustained-release,long-lasting and low-toxin effects against C. lanigera and B. serratus. Therefore,it could be used alternatively with other pesticides,to delay production and development of drug resistance.

关键词： Sustained-release and long-lasting pesticide Convenient and efficient pesticide application Sugarcane pests Control effect evaluation