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Defence Technology（防务技术） 2024年第2期32卷 254-261页

作者： Benfeng Gu Haiyuan li baoming li National Key Laboratory of Transient Physics Nanjing University of Science and TechnologyNanjing 210094China

To accelerate the practicality of electromagnetic railguns,it is necessary to use a combination of threedimensional numerical simulation and experiments to study the mechanism of bore damage.In this paper,a three-dimensional numerical model of the augmented railgun with four parallel unconventional rails is introduced to simulate the internal ballistic process and realize the multi-physics field coupling calculation of the rail gun,and a test experiment of a medium-caliber electromagnetic launcher powered by pulse formation network(PFN)is carried out.Various test methods such as spectrometer,fiber grating and high-speed camera are used to test several parameters such as muzzle initial velocity,transient magnetic field strength and stress-strain of rail.Combining the simulation results and experimental data,the damage condition of the contact surface is analyzed.

关键词： Internal ballistic modeling Electromagnetic rail gun Multi-physics field coupling Experimental validation PFN

Optimization of slightly acidic electrolyzed water spray for airborne culturable bacteria reduction in animal housing

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International Journal of Agricultural and Biological Engineering 2016年第4期9卷 185-191页

作者： Zheng Weichao Ni li Hui Xue li baoming Zhang Jiafa College of Water Recourses&Civil Engineering China Agricultural UniversityBeijing 100083China Key Lab of Agricultural Engineering in Structure and Environment Ministry of AgricultureBeijing 100083China Beijing Engineering Research Center on Animal Healthy Environment Beijing 100083China

Slightly acidic electrolyzed water(SAEW)spray has been considered as a novel approach for airborne bacteria reduction in animal housing.This study aimed to optimize the operating parameters of SAEW spray based on the size distribution of sprayed aerosols,the available chlorine travelling loss in sprayed aerosols,and the reduction efficiency of airborne culturable bacteria(CB).The optimized operating parameters were the nozzle orifice diameter and the spray pressure.The size distribution characteristics of sprayed SAEW aerosols under different operating parameters were quantified.The pH and available chlorine concentrations of the original SAEW solution and the SAEW aerosols collected at 0 m,0.25 m,0.50 m,0.75 m,and 1.00 m from the spray nozzle head were analyzed.A bioaerosol nebulizing generator was used to simulate animal housing environment in an environmentally-controlled chamber.Six SAEW spray trials under different operating parameters were conducted at a spray dosage of 80 mL/m2 in the chamber.Airborne CB concentrations before and after spray were measured to investigate the reduction efficiency of airborne CB.Dv(50),the volume-based diameter below which 50%of the particle being present,increased with the nozzle orifice diameter and decreased with the spray pressure.The travelling loss of available chlorine in the sprayed SAEW aerosols was greatly dependent on Dv(50).SAEW spray with medium size sprayed aerosols(Dv(50)=86.62μm,67.94μm,and 54.53μm)showed significantly higher airborne CB reduction efficiencies than large(Dv(50)=121.80μm and 96.00μm)or small size aerosols(Dv(50)=42.57μm).The spray operating parameters that provide medium size sprayed aerosols(Dv(50)~60-90μm)are recommended for SAEW spray in animal housing.

关键词： animal housing bioaerosol available chlorine size distribution air quality poultry and livestock

Nitrogen and phosphorous adsorption from post-hydrothermal liquefaction wastewater using three types of zeolites

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International Journal of Agricultural and Biological Engineering 2015年第5期8卷 86-95页

作者： Ran Xia Duan Na Yuanhui Zhang li baoming liu Zhidan Lu Haifeng Laboratory of Environment Enhancing Energy E2E College of Water Resources and Civil EngineeringChina Agricultural UniversityBeijing 100083China Department of Agricultural and Biological Engineering University of Illinois at Urbana-Champaign1304 W Pennsylvania AvenueUrbana IL 61801USA

Hydrothermal liquefaction(HTL)has been studied as a promising technology for converting wet biomass into bio-crude oil and the nutrient-rich post-hydrothermal liquefaction wastewater(PHWW)could be reused for algae and bacteria production.However,the PHWW from HTL contains various types of contaminants that need to be removed before reuse.Too high nutrients(nitrogen and phosphorous)contents,such as ammonium,are inhibitive to algal growth and bacteria species in anaerobic process.It is desirable to reduce nutrients concentration in PHWW to an acceptable level using zeolite adsorption.This study investigated nitrogen and phosphorous adsorption efficiencies from PHWW using three types of zeolites:activated clinoptilolite,natural clinoptilolite and Na-modified zeolite.Effects of ions and pH in the adsorption process were also investigated.Results showed that three zeolite variables affecting ammonium adsorption process could be ranked as follows:zeolite dosage>type>particle size,via an orthogonal experiment design.Activated clinoptilolite,with a particle size of 0.18-0.30 mm and a dosage of 0.4 g/mL demonstrated the highest ammonium adsorption efficiency of 54.92%.Zeolite could also adsorb organic nitrogen and had a high adsorption efficiency of phosphorous(97.85%).This study showed that zeolite is effective to adsorb nutrients in PHWW.The adsorption treated PHWW can then be used for culturing algae or anaerobic treatment,and the adsorbed nutrients can be reused later.

关键词： adsorption,ammonium,nutrients phosphorous,zeolite,post-hydrothermal liquefaction wastewater(PHWW)

Effects of water-cooled cover on physiological and production parameters of farrowing sows under hot and humid climates

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International Journal of Agricultural and Biological Engineering 2016年第4期9卷 178-184页

作者： Pang Zhenzhen li baoming Zheng Weichao lin Baozhong liu Zuohua Department of Protected Agriculture Science and Engineering Hainan UniversityHainan 570228China Key Laboratory of Structure and Environment in Agricultural Engineering Ministry of AgricultureChina Agricultural UniversityBeijing 100083China Chongqing Academy of Animal Sciences Chongqing 402460China

The hot and humid climates,as encountered in the southern region of China with the open housing,can adversely impact the sows undergoing heat stress during the most vulnerable period at lactation.Hence,a water-cooled cover system(WCCs)for local cooling has essential practical value to improve productivity.The WCCs was developed for the sow crate of lactating sows separately,which performance was validated with the cooling efficiency in the sow occupied zone(SOZ)and physiological parameters.The results showed that the WCCs for the farrowing sows using aluminium plastic tubes connected in series could reach an appropriate cooling performance in adjacent units.The WCCs could decrease the SOZ air temperature by 3.0-4.5℃under the extremely hot climate when the indoor air temperature was 37℃,and maintain a suitable range(25-30℃)under the typical hot climate(ling)when the air temperature was below 30℃,but had a significant difference(plimate.

关键词： localized cooling heat stress farrowing sow water-cooled cover hot and humid climate

Experimental Research on the Mechanism of lift Amplification and Vibration Suppression of Lorentz Force

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Defence Technology（防务技术） 2013年第2期9卷 110-116页

作者： ZHANG Hui FAN Baochun CHEN Zhihua li Hongzhi li baoming Science and Technology on Transient Physics Laboratory Nanjing University of Science and Technology

The Lorentz force generated by electromagnetic field on the surface of the cylinder in the electrolyte solution may modify the structure of the flow boundary layer effectively. The transient control process of Lorentz force is investigated experimentally for lift amplification and vibration suppression. The experiments are conducted in a rotating annular tank filled with a low-conducting electrolyte. A cylinder with an electro-magnetic actuator is placed into the electrolyte. The lift force of cylinder is measured using the strain gages attached to a fixed beam, and the flow fields are visualized by the dye markers. The results show that the upper vortex on the cylinder is suppressed, and the wake becomes a line and leans to the lower side under the action of upside Lorentz force while the lower vortex on the cylinder is suppressed and limited in a small region. Therefore, the value of lift increases with the variation of flow field. However, the vortexes on the cylinder are suppressed fully under the action of symmetrical Lorentz force which leads to the suppression of lift oscillation and then the vibration of cylinder are suppressed fully.

关键词： hydromechanics flow control Lorentz force vortex-induced vibration cylinder wake

Behavioral response of pregnant ewes to high ambient temperature in loose housing system

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International Journal of Agricultural and Biological Engineering 2008年第1期1卷 31-36页

作者： Geng Ailian Zang Qiang Chen Gang Shi Zhengxiang li baoming Key Laboratory of Agricultural Bioenvironmental Engineering Ministry of AgricultureCollege of Water Conservancy and Civil EngineeringChina Agricultural UniversityBeijing 100083China Institute of Animal Husbandry and Veterinary Medicine Beijing Academy of Agriculture and Forestry SciencesBeijing 100097China

In order to investigate the behavioral responses of pregnant ewes to high ambient temperature in a loose housing system,eighty-seven pregnant ewes(Chinese little fat-tailed sheep,Ovis aries)from the same loose house were chosen,and nine ewes with the similar body weight and age were marked for later individual behavioral observation.The ambient temperature and relative humidity were recorded,and the individual behaviors of the pregnant ewes were observed continuously from 04:50 to 20:00 once every other day for 14 days.The behavioral state of all the pregnant ewes was recorded once every hour from 5:00 to 20:00,the number of pregnant ewes selecting specific lying areas(designated as area A and area B),was recorded at 15 minute intervals from 12:00 to 17:00 everyday.The final results show that the behavioral durations are significantly different in eating and drinking,rumination,rest,and locomotion for pregnant ewes(P<0.05).The time spent in lying for rumination or rest is significantly longer than that for locomotion(P<0.05).Temperature has a significant effect on the number of pregnant ewes lying on the floor(P<0.05).There are significant differences for pregnant ewes’preference of area A and area B for lying at temperatures ranging from 27.0℃to 31.0℃(P<0.05).The results indicate that the lying behavior is significantly more than the locomotion behavior for the pregnant ewes in the loose housing systems under the high ambient temperature.

关键词： pregnant ewes loose housing behavior high temperature

温和地区既有公共建筑超低能耗改造方法研究——以云南建筑技术发展中心节能改造设计为例

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建筑节能（中英文） 2024年第5期52卷 62-66页

作者：李宝明云南城建设计院股份有限公司昆明650100

20世纪末的既有公共建筑相对于参照建筑的节能率普遍较低,远未达到现行节能标准,使用时达到一定的舒适度需要消耗较多能源。为了推进云南省温和地区城市更新中的既有建筑节能改造标准编制,进一步完善既有公共建筑节能降碳改造指南,通过... 详细信息

20世纪末的既有公共建筑相对于参照建筑的节能率普遍较低,远未达到现行节能标准,使用时达到一定的舒适度需要消耗较多能源。为了推进云南省温和地区城市更新中的既有建筑节能改造标准编制,进一步完善既有公共建筑节能降碳改造指南,通过对典型案例云南建筑技术发展中心办公楼进行了超低能耗改造设计研究,以模拟计算数据和实际检测数据为依据,系统地剖析了温和地区既有公共建筑超低能耗改造的性能化设计方法和独特构造设计措施。结果表明:云南温和地区的节能改造措施有别于其他气候区,改造成本相对较低;通过对外围护结构进行得当的节能改造和增强气密性,能耗指标将大幅度降低且舒适度提高,可以达到超低能耗建筑节能标准。

关键词：超低能耗建筑温和地区既有公共建筑改造设计研究

Application of tobacco stems briquetting in tobacco flue-curing in rural area of China

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International Journal of Agricultural and Biological Engineering 2015年第6期8卷 84-88页

作者： Wang Xinfeng Xu Guizhuan Zhang Bailiang Jiao Youzhou Lu Haifeng li baoming Department of Agricultural Structure and Bio-environmental Engineering College of Water Resources&Civil EngineeringChina Agricultural UniversityBeijing 100083China Department of Bio-energy and Bio-environmental Engineering College of Mechanical&Electrical EngineeringHenan Agricultural UniversityZhengzhou 450002China

To reduce the conventional energy consumption in rural area of China,tobacco stems briquetting(TSB)was used as fuel during the process of tobacco flue-curing,compared with honeycomb briquette(HB).Three fire furnaces with different heat exchangers using TSB were compared using the tobacco flue-curing.The results showed that the smog temperature of TSB was higher than that of HB,the efficiency of bio-fuel system with TSB was from 43.5%to 54%,while the efficiency of traditional fuel system was 51.5%.And the cost of tobacco flue-curing per hectare with TSB and HB was$750.0 and$1282.5,respectively.It is proved that TSB is an alternative choice using for the industry of tobacco flue-curing,and the improvement in the structure of fire furnace could optimize the process of tobacco flue-curing.

关键词： biomass briquetting tobacco flue-curing bio-fuel fire furnace

Overview of 2015 International Symposium on Animal Environment and Welfare held in Chongqing,China

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International Journal of Agricultural and Biological Engineering 2015年第5期8卷 179-180页

作者： Wang Chaoyuan liu Wen li baoming Hongwei Xin Department of Agricultural and Bioenvironmental Engineering China Agricultural UniversityBeijing 100083China Chongqing Academy of Animal Sciences Chongqing 402460China Departments of Agricultural&Biosystems Engineering Iowa State UniversityAmesIowa 50011USA

On October 24-25,2015 International Symposium on Animal Environment and Welfare(ISAEW2015),jointly sponsored by the International Research Center for Animal Environment and Welfare(IRCAEW)and the Chinese Society of Agricultural Engineering,was convened in Chongqing Academy of Animal Sciences(CAAS),Chongqing,China.Prof.baoming li from China Agricultural University(CAU)and Distinguished Prof.Hongwei Xin from Iowa State University were the Co-Chairs of ISAEW2015,and Prof.Zuohua liu from CAAS chaired the Organizing Committee.

关键词： Chongqing jointly Agricultural

Inactivation efficiency of slightly acidic electrolyzed water against microbes on facility surfaces in a disinfection channel

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International Journal of Agricultural and Biological Engineering 2017年第6期10卷 23-30页

作者： Zang Yitian li baoming Shi Zhengxiang Sheng Xiaowei Wu Hongxiang Shu Dengqun College of Animal Science and Technology Jiangxi Agricultural UniversityNanchang 330045China Key Laboratory of Structure and Environment in Agricultural Engineering Ministry of AgricultureChina Agricultural UniversityBeijing 100083China

Slightly acidic electrolyzed water(SAEW,pH 6.0-6.5)is an ideal and environmentally-friendly disinfectant,which was used to prevent and control bacterial infections on farms.This work aims to investigate the inactivation effectiveness of SAEW in inactivating microbes in a disinfection channel.The bactericidal efficiency of SAEW on equipment surfaces was compared to two commercial disinfectants,Kuei A bromide solution(KAS,5:1000 v/v)and Glutaraldehyde solution(GS,5:1000 v/v).The disinfection effectiveness of SAEW in inactivating Salmonella enteritidis(S.enteritidis)on equipment surfaces in the disinfection channel was evaluated,and a model was developed using multiple linear regression analysis.Results indicated that SAEW was significantly(plished model had a good fit-quantified by the determination coefficient R^(2)(0.939)and a lack of fit test(p>0.05).In addition,available chlorine concentration(ACC)was an important factor than other factors,and the inactivation efficiency of Salmonella enteritidis sprayed by SAEW treatment was different between iron materials,kits and clothing surfaces(iron>kit>clothing).

关键词： slightly acidic electrolyzed water disinfection channel S.enteritidis disinfection bacterial infection prevention and control livestock farm