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Effect of powder feeding rate and size on critical velocity and mechanical properties of cold sprayed Al_(2)O_(3)/2024 deposit

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Chinese Journal of Aeronautics 2024年第12期37卷 544-559页

作者： Dong WU Jiaju ZHANG Yu SU Wenya LI Yaxin XU Xiawei YANG Chunjie HUANG School of Materials Science and Engineering East China Jiaotong UniversityNanchang330013China State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure East China Jiaotong UniversityNanchang 330013China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Shaanxi Key Laboratory of Friction Welding Technologies Northwestern Polytechnical UniversityXi’an 710072China

The particle acceleration behavior and deposition mechanism of cold spraying aluminum matrix composites(Al_(2)O_(3)/2024)are complicated by the addition of ceramic *** effects of different feeding rates and particle diameters on critical velocity and mechanical properties were studied by numerical simulation and *** results indicate that as the powder feeding rate increases,the impact velocity of gas and particles gradually decreases,and the temperature of gas and particles increases,resulting in an increase in the difference between particle impact velocity and critical *** highest tensile strength of the deposit is achieved at a powder feeding rate of 1 r/min,which is 343 *** the powder feeding rate increases,the performance of the deposits decreases,but it significantly saves time and *** the particle diameter increases,the impact temperature first increases and then decreases,resulting in the critical velocity first decreasing and then increasing,and the mechanical performance first increasing and then *** some extent,the best performance of the deposit is achieved when the size of the metal particle is close to that of the ceramic particle.

关键词： Cold spray Aluminum matrix composites Critical velocity feeding rate Particle size Mechanical property

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Effects of feeding rate and formula fineness degree of ring die pellet mill on mechanical property, physical quality, energy requirements, and production cost of poultry diets

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International Journal of Agricultural and Biological Engineering 2023年第3期16卷 30-36页

作者： Khaled A.Metwally Reda I.Zaki Sally S.Fouda Reem S.Alruhaimi Haifa A.Alqhtani Nouf Aldawood Ayman M.Mahmoud Mohammed A.E.Naiel Department of Soil and Water Sciences Faculty of Technology and DevelopmentZagazig University44511Egypt Fish Nutrition and Feed Technology Department Central Laboratory for Aquaculture ResearchAgriculture Research CenterAbbassa 44661Abu-HammedSharkiaEgypt Bio Engineering Department Agricultural Engineering Research Institute(AENRI)Agriculture Research CenterEgypt Department of Biology College of SciencePrincess Nourah bint Abdulrahman UniversityRiyadh 11671Saudi Arabia Physiology Division Zoology DepartmentFaculty of ScienceBeni-Suef UniversityBeni-Suef 62514Egypt Department of Life Sciences Faculty of Science and EngineeringManchester Metropolitan UniversityManchester M15GDUK Department of Animal Production Faculty of AgricultureZagazig UniversityZagazig 44511Egypt

The effect of a machine feeding rate(FR;1,1.5 and 2 Mg/h)and/or three levels of selected fineness degree(FD;3,5 and 7 mm)on machine performance,pellet physical parameters,required energy and production cost of three main types of broilers diets were examined in this *** examined broiler diets were formulated to meet the Ross 308 strain requirements.A complete factorial design(3×3×3)was used to identify the effects of studied factors on the pellet mill machine and pellet *** obtained results indicated that the pellet mill productivity significantly(p˂0.001)improved through increased pellet mill feeding rate *** addition,the machine pelleting efficiency was found to be significantly affected by all studied variables and their *** the total power consumption of the machine showed no variations under the impact of the tested factors or with any of their *** the pellet physical quality indices,all broiler diets with all selected FD and lower FR had the maximum durability and bulk density ***,lower feeding rates were associated with higher hardness *** lowest production costs were substantially correlated with high FR and intermediate FD(5 mm).Furthermore,production costs were determined to be reduced in finisher broiler diets under different feeding ***,manufacturing costs of finisher broiler meals were observed to decrease in several feeding ***,these findings indicate the capabilities of producing high-quality pellets and reducing the needed production costs by optimizing feeding rates to 2 Mg/h and 2 mm fineness in broiler diets.

关键词： feeding rate fineness degree broiler diets pellet quality production cost

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Design and modelling of the full-feed peanut picking device with selfadaptive adjustable working clearance and feeding rate

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International Journal of Agricultural and Biological Engineering 2023年第6期16卷 97-106页

作者： Shenying Wang Baoliang Peng Huichang Wu Zhichao Hu Dawei Sun Yongwei Wang Mingzhu Cao College of Biosystems Engineering and Food Science Zhejiang UniversityHangzhou 310058China Nanjing Institute of Agricultural Mechanization Ministry of Agriculture and Rural AffairsNanjing 210014China Key Laboratory of Intelligent Equipment and Robotics for Agriculture of Zhejiang Province Hangzhou 310058China Key Laboratory of Agricultural Equipment for Hilly and Mountainous Areas in Southeastern China(Co-construction by Ministry and Province) Ministry of Agriculture and Rural AffairsHangzhou 310058China

To improve the declining performance of a full-feed peanut picking device or solve the mechanical failures that occur due to fluctuations in the feeding rate during operation,the 4HLJI-3000 peanut intelligent picking combine harvester,which is a picking device with a self-adaptive adjustment of the working clearance,was developed as the research object in this ***,the key components,such as the picking roller,concave plate sieve and clearance adjustment mechanism of the concave plate sieve,were designed and *** the force analysis of the concave plate sieve of the picking device,the mathematical model of the concave plate sieve displacement of the picking device and feeding rate was *** software system for monitoring,storing and analysing the concave plate sieve displacement of the picking device based on EasyBuilder Pro was designed,and the road monitoring test of displacement variation of concave plate sieve of the picking device and feeding rate was carried *** linear function,power function,exponential function,quadratic function,compound function,logarithmic function and cubic function fitting were used to perform regression analysis of the test results by using IBM SPSS *** results showed that the cubic function model had a higher fitting precision,and its determination coefficient was *** verification experiments were proposed,and the results showed that the established cubic function model had a good *** absolute deviation rate ranged from 0 to 4.83%,and the average deviation rate was 2.22%.The deviation rate increased with an increasing feeding *** field experiments also proved that there was a cubic function relationship between the feeding rate and concave plate sieve displacement,the measured concave plate sieve displacement deviation rate ranged from 0 to 6.19%,and the average deviation rate was 2.73%compared with the calculated *** study can provide a reference for the optimiza

关键词： agricultural machinery peanut picking device feeding rate concave plate sieve displacement EasyBuilder

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Suitable Temperature, Stocking Density and feeding rate for Optimal Growth of Sex Reversed Fry of Nile Tilapia Oreochromis niloticus (Senegal River Strain)

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Agricultural Sciences 2022年第7期13卷 897-915页

作者： Mbaye Tine Adji Bineta Thiombane Famara Sonko Ndeye Dioguy Ndiaye Hamet Diaw Diadhiou UFR of Agricultural Sciences Aquaculture and Food Technologies (UFR S2ATA) Gaston Berger University (UGB) Saint-Louis Senegal ISRA/Oceanographic Research Center Dakar-Thiaroye Dakar Senegal

Determining the suitable fish farming conditions for optimal growth is necessary for aquaculture production, but it is not very obvious because it requires a good understanding of species biology. Thus, this study aims to evaluate the effects of different temperature regimes, stocking densities, and feeding rates on the growth of Nile tilapia, Oreochromis niloticus fingerlings that have been sex-reversed with 17α methyl testosterone. Three independent experiments were performed (with replicates) at the IRD Bel-Air fish farm (Dakar, Senegal) on 27-day-old fry maintained in six 25 L tanks with a batch of 100 individuals each. These fry were subjected to three different temperatures (26˚C, 28˚C, 30˚C;kept constant with thermostats), stocking densities (5, 10 and 15 ind/l) and feeding rates (5%, 10% and 15% of biomass;distributed three times a day). For the temperature and density treatments, fry was fed a pelleted feed containing 38% protein, distributed by hand at 10% of their total biomass, readjusted after each measurement. Growth performance (total weight, weight gain and daily weight gain), physicochemical parameters (temperature, oxygen, nitrite and phosphorus), feed conversion ratio (FCR) and survival rate (SR) were regularly monitored (weekly) during the experimental period. For the heat treatment, the results did not show an apparent relationship between growth performance and nitrite, phosphorus or dissolved oxygen (DO) contents. In contrast, there was a significant correlation between temperature and growth rates, with the best growth being obtained at 30˚C compared to 28˚C and 26˚C. Similarly, growth rates were correlated with stocking density and feeding rate but not with oxygen, temperature, nitrite or phosphorus levels. The best growth rates were observed at the lowest density (5 ind/l) and for the highest feeding rate (15% of biomass), which coincides with the best FCR and survival rates. Thus, 30˚C, 5 ind/l and 15% of

关键词： Density feeding rate Fry Growth Temperature Nile Tilapia

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Inter-individual variation in provisioning rate,prey size and number,and links to total prey biomass delivered to nestlings in the Collared Flycatcher(Ficedula albicollis)

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Avian Research 2021年第2期12卷 237-246页

作者： Laure Cauchard Elise Isabella Macqueen Rhona Lilley Pierre Bize Blandine Doligez School of Biological Sciences University of AberdeenAberdeenUK Department of Biometry and Evolutionary Biology CNRSUniversity of LyonUniversity Lyon 1VilleurbanneFrance Animal Ecology Department of Ecol-ogy and GeneticsEvolutionary Biology CentreUppsala UniversityUppsalaSweden

Background:In bird species where offspring growth and survival rely on parents’food provisioning,parents can maximise their fitness by increasing the quantity and/or the quality of preys delivered to their *** studies have focused on inter-individual variation in feeding rate,yet this measure may not accurately reflect the total amount of food(***)provided by parents if there is large variation in the quantity and quality of preys at each ***,we explored the relative role of individual(sex,age,body condition),breeding(hatching date,brood size)and environmental(temperature)factors on feeding rate,prey number,size and quality,and their contribution to total prey biomass delivered to the nestlings of 164 Collared Flycatcher(Ficedula albicollis)parents in 98 ***:Preys delivered to the nest were mainly larvae(53.6%)and flying insects(45.6%).feeding rate increased with brood size and age,and was higher in males than *** prey number decreased,but mean prey size increased,as the season progressed and parents feeding their brood with primary larvae brought more preys per *** between feeding rate,mean prey number and size remained when taking into account the provision-ing quality:parents brought either a large number of small prey or a small number of larger items,and the force of the trade-offs between feeding rate and mean prey number and size depended on the quality of the provisioning of the *** the percentage of larvae among preys in the provisioning,the variance in total prey biomass was foremost explained by feeding rate(65.1%to 76.6%)compared to mean prey number(16.4%to 26%)and prey size(2.7%to 4%).Conclusions:Our study shows that variation in feeding rate,prey number,size,but not quality(*** of lar-vae),were influenced by individual factors(sex and age)and breeding decisions(brood size and timing of breeding)and that,whatever the provisioning strategy adopted,feeding rate was the b

关键词： Collared Flycatcher feeding rate Foraging Niche breadth Prey selection Provisioning strategy Reproductive investment

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Effect of Water Temperature on feeding Rhythm in Common Carp (Cyprinus carpio haematopterus Temminck et Schlegel)

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Journal of Northeast Agricultural University(English Edition) 2012年第1期19卷 57-61页

作者： Chen Song-bo Chen Wei-xing Fan Zhao-ting College of Animal Sciences and Technology Northeast Agricultural UniversityHarbin 150030China

feeding rhythm of common carp was investigated from 4℃ to 34℃. The results indicated that there was a diel feeding rhythm for both adult （630-850 g） and youth （61-91 g） at all tested temperatures. There were two main activity peaks at 8：00-11：00 a.m. and 19：00-23：00 p.m., during which feeding quantities were 10.68%-32.53% and 16.25%-33.41% of the daily intake, respectively. When water temperature dropped to below 10℃, the feeding peak concentrated at 8：00-11：00 a.m. and 19：00 p.m. to 4：00 a.m. At 6℃, though both adult and youth would still feed, the feeding quantities were only 0.01% and 0.35% of body mass. Daily feeding rate of adult and youth reached 1.21% and 2.63% at 14℃, respectively. Both adult and youth carps reached the maximum daily feeding rate at 28℃, being 2.84% and 12.06% of body mass, respectively. The daily feeding rate of adult and youth reduced suddenly after at 34℃, and the daily feeding rate was only 0.74% and 9.45% of body mass, respectively. There was significant difference in daily feeding rate at different water temperatures （P〈0.05）.

关键词： common carp feeding rate diel feeding rhythm water temperature

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Effects of Different feeding Patterns on the Growth of Micropterus salmoides

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Agricultural Biotechnology 2023年第2期12卷 38-41页

作者： Yuzhang HAN Zhourui WEN Aiwu YI Jun HUANG Zhiqiang ZHU Wenyu TONG Hongping ZHENG Hubei Fisheries Science Research Institute Wuhan 430071China Zhijiang City Yuyatou Aquaculture Professional Cooperative Yichang 433200China

Three experimental groups with different feeding frequencies,different feeding rates and compensatory feeding were set up to study their effects on the growth of Micropterus *** results showed that different feeding rates of 2%,3%and 4%had no significant effects on the growth of ***,before the individual weight of 50 g,the fish could be fed with a feeding rate of 4%,which could be gradually decreased to 2%in the later *** the condition of relatively fixed feeding rate,different feeding frequencies had an impact on the growth of *** the conditions of suitable water temperature,it is reasonable to feed twice *** experimental fish fed for 5 d and then deprived of feed for 1 d showed fully compensatory growth,and there were no significant differences in weight gain rate,daily weight gain and specific growth rate compared with the continuous feeding group(P>0.05).Therefore,according to the feeding conditions of fish in the breeding process,stopping feeding for 1 d every 5 d could save feed and labor and improve breeding efficiency.

关键词： Micropterus salmoides feeding rate feeding frequency Compensatory feeding

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