Agronomy research最新文献_第7页

Comparison between the thermal properties of cement composites using infrared thermal images. 水泥复合材料红外热成像热性能比较。

Agronomy research Pub Date : 2020-01-01 DOI: 10.15159/AR.20.110

P. Ferraz, R. F. Mendes, G. Ferraz, F. A. Damasceno, I. Silva, L. Vaz, L. Mendes, D. Cecchin, J. O. Castro

{"title":"Comparison between the thermal properties of cement composites using infrared thermal images.","authors":"P. Ferraz, R. F. Mendes, G. Ferraz, F. A. Damasceno, I. Silva, L. Vaz, L. Mendes, D. Cecchin, J. O. Castro","doi":"10.15159/AR.20.110","DOIUrl":"https://doi.org/10.15159/AR.20.110","url":null,"abstract":"The use of agribusiness residual lignocellulosic fibres can be a good alternative in the development of lignocellulosic composites. The current work aimed to investigate the thermal performance of cement-based composites with lignocellulosic materials: Eucalyptus, sugarcane bagasse, coconut fibre in comparison with commercial gypsum board to be used as internal partitions of the building using infrared thermal images. Three repetitions for each kind of lignocellulosic material were made, and three commercial gypsum boards were used. In the production of the panels, the following parameters were applied: material and cement ratio, 1:2.75; water and cement ratio, 1:2.5; hydration water rate of 0.25; additive, 4% (based on cement mass). The calculations were performed for a nominal panel density of 1,200 kg m3. The thermal analysis was performed in a chamber composed of MDP (Medium-Density Particleboard) and with an internal layer of rock wool and the heat source (thermal resistance). For the superficial temperature measurement, a FLIR E75 camera was used to capture the infrared images. When the internal temperature of the chamber stabilized at 50 °C, an infrared thermal image was collected from each side of the composite. Thermal properties were analysed: thermal conductivity, resistivity, resistance, and transmittance. Based on the results, sugar cane cement composites were characterized by higher values of thermal conductivity. Related to thermal resistivity, thermal resistance, and thermal transmittance, only the coconut panel presented similar behaviour to the commercial gypsum board. Thus, cement composite using coconut can be a potential alternative that might solve energy and environmental concerns simultaneously.","PeriodicalId":7924,"journal":{"name":"Agronomy research","volume":"18 1","pages":"806-814"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66969872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Effect of concentrate feeding technology on nutrient digestibility in Latvian Dark-Head lambs 精料饲养技术对拉脱维亚黑头羔羊营养物质消化率的影响

Agronomy research Pub Date : 2020-01-01 DOI: 10.15159/AR.20.143

L. Šenfelde, D. Kairiša, D. Barzdina

引用次数: 0

Investigation of dual varying area flapping actuator of a robotic fish with energy recovery 带能量回收的机器鱼双变面积扑动机构研究

Agronomy research Pub Date : 2020-01-01 DOI: 10.15159/AR.20.144

I. Tipāns, J. Viba, M. Irbe, S. Vutukuru

{"title":"Investigation of dual varying area flapping actuator of a robotic fish with energy recovery","authors":"I. Tipāns, J. Viba, M. Irbe, S. Vutukuru","doi":"10.15159/AR.20.144","DOIUrl":"https://doi.org/10.15159/AR.20.144","url":null,"abstract":"Autonomous under-water vehicles (AUV) performing a commanded task require to utilize on-board energy sources. At the time when on-board power source runs low during operation, the vehicle (AUV) is forced to abort the mission and to return to a charging station. The present work proposes the technique of an energy recovery from surrounding medium. This effect is studied for dual action actuator movement that obtains energy from fluid. It is realized that a flapping or vibrating actuator can be used for energy extraction phenomenon apart from the non-traditional propulsive technique. In the present work a simple dual flapping actuator that can switch between simple flat plate and perforated plate at extreme end positions (angles) by using an efficient mechatronic mechanism that would help in overcoming viscous forces of the operating medium is extensively studied. The main objective of the present article is to develop a new approach for energy gain and recharge power pack of on-board sources from the surrounding medium and to create a robotic fish that would work autonomously by using unconventional drive along with the possibility of energy restoration by using dual varying area type vibrating actuator. At the time of recharge, the robotic fish would project its tail (actuator) out of water and use surrounding medium (air) to scavenge the energy. All the equations describing the process are formed according to classical laws of mechanics. The mechatronic system is explained and the results obtained are discussed in detail for air as the operating fluid to scavenge energy.","PeriodicalId":7924,"journal":{"name":"Agronomy research","volume":"18 1","pages":"1046-1055"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66971372","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Chemical analyses of lignocellulosic materials residue for cement panels reinforcement. 水泥板加固用木质纤维素材料残留物的化学分析。

Agronomy research Pub Date : 2020-01-01 DOI: 10.15159/AR.20.155

P. Ferraz, R. F. Mendes, G. Ferraz, G. Rossi, L. Conti, M. Barbari

{"title":"Chemical analyses of lignocellulosic materials residue for cement panels reinforcement.","authors":"P. Ferraz, R. F. Mendes, G. Ferraz, G. Rossi, L. Conti, M. Barbari","doi":"10.15159/AR.20.155","DOIUrl":"https://doi.org/10.15159/AR.20.155","url":null,"abstract":"The use of lignocellulosic material residue in cement composites is on the rise as sustainable building materials in most developing countries. Besides, this alternative is seen as a good option for new cement panels formulations for indoor applications. Thus, the current paper aims to evaluate de chemical properties of five potential lignocellulosic materials residues to be used for cement panels reinforcement: Eucalyptus, sugarcane bagasse, coconut fibre, coffee rusk, and banana pseudostem. The following physical properties of the lignocellulosic materials were evaluated: lignin, extractives, ash, and holocellulose. To evaluate the similarity of the chemical composition of the lignocellulosic materials, Hierarchical Cluster Analysis (HCA) was used identified by using Ward’s method of cluster analysis. These compositions were grouped by dendrograms in which the similarity of these data was qualified. It was observed that there were statistical differences among all types of lignocellulosic materials related to the chemical composition. Coconut showed the smallest amount of extractives, and sugar cane the most significant amount. Eucalyptus and coffee husk presented the most similar chemical composition. All of the evaluated materials could be used in fibre cement production for indoor applications.","PeriodicalId":7924,"journal":{"name":"Agronomy research","volume":"18 1","pages":"815-822"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66971392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Development of an efficient regeneration system for bombarded calli from immature embryos of Moroccan durum wheat varieties 摩洛哥硬粒小麦品种未成熟胚轰击愈伤组织高效再生体系的建立

Agronomy research Pub Date : 2019-11-11 DOI: 10.15159/AR.19.191

Chaimae Senhaji

引用次数: 1

Review: Soil compaction and controlled traffic farming in arable and grass cropping systems 综述：耕地和草地种植系统中的土壤压实和控制交通农业

Agronomy research Pub Date : 2019-05-04 DOI: 10.15159/AR.19.133

D. Antille, S. Peets, J. Galambošová, G. Botta, V. Rataj, M. Macák, J. Tullberg, W. Chamen, D. White, P. Misiewicz, P. Hargreaves, J. Bienvenido, R. Godwin

{"title":"Review: Soil compaction and controlled traffic farming in arable and grass cropping systems","authors":"D. Antille, S. Peets, J. Galambošová, G. Botta, V. Rataj, M. Macák, J. Tullberg, W. Chamen, D. White, P. Misiewicz, P. Hargreaves, J. Bienvenido, R. Godwin","doi":"10.15159/AR.19.133","DOIUrl":"https://doi.org/10.15159/AR.19.133","url":null,"abstract":"There is both circumstantial and direct evidence which demonstrates the significant productivity and sustainability benefits associated with adoption of controlled traffic farming (CTF). These benefits may be fully realised when CTF is jointly practiced with no-tillage and assisted by the range of precision agriculture (PA) technologies available. Important contributing factors are those associated with improved trafficability and timeliness of field operations. Adoption of CTF is therefore encouraged as a technically and economically viable option to improve productivity and resource-use efficiency in arable and grass cropping systems. Studies on the economics of CTF consistently show that it is a profitable technological innovation for both grassland and arable land-use. Despite these benefits, global adoption of CTF is still relatively low, with the exception of Australia where approximately 30% of the grain production systems are managed under CTF. The main barriers for adoption of CTF have been equipment incompatibilities and the need to modify machinery to suit a specific system design, often at the own farmers’ risk of loss of product warranty. Other barriers include reliance on contracting operations, land tenure systems, and road transport regulations. However, some of the barriers to adoption can be overcome with forward planning when conversion to CTF is built into the machinery replacement programme, and organisations such as ACTFA in Australia and CTF Europe Ltd. in Central and Northern Europe have developed suitable schemes to assist farmers in such a process.","PeriodicalId":7924,"journal":{"name":"Agronomy research","volume":"17 1","pages":"653-682"},"PeriodicalIF":0.0,"publicationDate":"2019-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41804442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 31

A software to estimate heat stress impact on dairy cattle productive performance 一个估算热应激对奶牛生产性能影响的软件

Agronomy research Pub Date : 2019-01-01 DOI: 10.15159/AR.19.110

C. S. Teles, R. Gates, M. Barbari, L. Conti, G. Rossi, M. O. Vilela, C. F. Souza, I. Tinôco

{"title":"A software to estimate heat stress impact on dairy cattle productive performance","authors":"C. S. Teles, R. Gates, M. Barbari, L. Conti, G. Rossi, M. O. Vilela, C. F. Souza, I. Tinôco","doi":"10.15159/AR.19.110","DOIUrl":"https://doi.org/10.15159/AR.19.110","url":null,"abstract":"The aim of this study is to develop a computational tool, based on the Temperature and Humidity Index value, to characterize the thermal environment in dairy cattle barns and to evaluate the impact of thermal stress on productive performance. The software for the thermal environment prediction, and determination of the influence of heat stress on dairy cow productivity (Ambi + Leite) was developed using the C# programming language in the Microsoft Visual C# 2010 Express Integrated Development Environment. The following scenario was considered for the program test: air temperature 32°C, relative air humidity 70% and milk production potential in thermoneutrality condition 20 kg cow-1 day-1. The prediction of the thermal environment based on the simulated situations indicates that the animals are submitted to a moderate heat stress condition with THI equal to 82.81. In this condition a decrease of approximately 26% in milk production and a reduction of 4 kg cow-1 day-1 in food intake was calculated. In conclusion, the developed software can be a practical tool to assist the producer in making-decision processes.","PeriodicalId":7924,"journal":{"name":"Agronomy research","volume":"85 1","pages":"872-878"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66968530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Effect of long-term operation of combustion engine running on n-butanol – rapeseed oil – diesel fuel blend 正丁醇-菜籽油-柴油混合燃料对内燃机长期运行的影响

Agronomy research Pub Date : 2019-01-01 DOI: 10.15159/AR.19.036

M. Holubek, J. Čedík, D. Mader, M. Pexa

{"title":"Effect of long-term operation of combustion engine running on n-butanol – rapeseed oil – diesel fuel blend","authors":"M. Holubek, J. Čedík, D. Mader, M. Pexa","doi":"10.15159/AR.19.036","DOIUrl":"https://doi.org/10.15159/AR.19.036","url":null,"abstract":"The short time use of biofuels in compression ignition engines is being studied by many authors. However, in many cases the real long–term operation of the engine on biofuels may cause problems. The article deals with the operation parameters of the combustion engine, fuelled by n-butanol – rapeseed oil – diesel fuel blend, during 70 hours operation in total. Two brand new diesel power generators Kipor KDE 6500 with output power of 4.6 kW were used for certain testing. The first generator was operated on 100% diesel fuel and it was used as a reference and the second generator was operated on experimental fuel containing 10% n-butanol – 20% rapeseed oil – 70% diesel fuel blend. The generators were equipped with single cylinder compression ignition engine Kipor KM 186 with the rated power of 5.7 kW. For the first 10 operating hours approx. 40% load was applied. Then, the generators worked for another 60 operating hours with approx. 70% load. The harmful emissions, smoke, fuel consumption and the amount of produced particles were also measured after 10 hours run-in period and then after another 60 hours of operation. Consequently, the results were compared. Measurements were carried out at gradually increasing electric power output, approx. 14%, 28%, 42%, 56%, 68%, 82% and 95% (in results can be found in Watts). Emission analyser and opacimeter BrainBee and Engine Exhaust Particle Sizer TSI were used for the measurements. The results showed increased production of emission of the engine running on fuel blend after 70 hours of operation. On the other hand, engine which operated on standard diesel reached lower fuel consumption. After 70 hours the blended fuel tended to produce more particles in comparison with diesel fuel.","PeriodicalId":7924,"journal":{"name":"Agronomy research","volume":"17 1","pages":"1001-1012"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66967726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Evaluating the effects of application modes and soil types on the herbicide efficacy and crop yield of pendimethalin and clomazone on transplanted pepper (Capsicum annuum L.). 评价不同施用方式和土壤类型对套种辣椒(Capsicum annuum L.)除草剂效果和作物产量的影响。

Agronomy research Pub Date : 2019-01-01 DOI: 10.15159/AR.19.046

G. Glatkova, Z. Pacanoski

{"title":"Evaluating the effects of application modes and soil types on the herbicide efficacy and crop yield of pendimethalin and clomazone on transplanted pepper (Capsicum annuum L.).","authors":"G. Glatkova, Z. Pacanoski","doi":"10.15159/AR.19.046","DOIUrl":"https://doi.org/10.15159/AR.19.046","url":null,"abstract":"Field experiment was carried out in 2014 and 2015 in two locations Kochani and Drachevo in Republic of Macedonia to evaluate the efficacy and crop safety of pendimethalin and clomazone on transplanted pepper according to mode of application, (pretransplant -PRE-T and pretransplant incorporated -PTI) and soil types (alluvial soil and vertisol). The weed population in both years and locations mainly consisted annual spring and summer grasses and broadleaf weeds. Weed competition significantly reduced pepper yield. There was no recorded difference between the efficacy of pendimethalin PRE-T and pendimethalin PTI. However, the efficacy of clomazone PTI was higher than that of clomazone PRE-T in both experimental years and locations, indicating incorporation into soil if critical for clamazone. Both pendimethalin and clomazone had low efficacy on Solanum nigrum L. Pepper plants were not visibly injured by any herbicides treatments. In summary, locations and soil types did not affect herbicide efficacy and pepper selectivity. Pepper yield was markedly affected by herbicide efficacy in both years and locations.","PeriodicalId":7924,"journal":{"name":"Agronomy research","volume":"17 1","pages":"430-437"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66967925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Measurements of wireless detectors used to monitor animal movements in livestock farms 用于监测畜牧场动物活动的无线探测器的测量

Agronomy research Pub Date : 2019-01-01 DOI: 10.15159/AR.19.093

J. Hart, V. Hartová

引用次数: 0