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Influences of harvester and weather conditions on field loss and milling quality of rough rice

International Journal of Agricultural and Biological Engineering 2017年第4期10卷 216-223页

作者： Ragab Khir griffiths atungulu Ding Chao Zhongli Pan Department of Biological and Agricultural Engineering University of CaliforniaDavisCA 95616USA Department of Agricultural Engineering Faculty of AgricultureSuez Canal UniversityIsmailiaEgypt Department of Food Science University of ArkansasFayettevilleAR 72701USA College of Food Science and Engineering Nanjing University of Finance and EconomiesNanjingJiangsu 210023China Healthy Processed Foods Research Unit Western Regional Research CenterAgricultural Research ServiceU.S.Department of AgricultureAlbanyCA 94710USA

A better understanding of factors affecting field losses and milling quality during harvest is needed to improve the economic value of *** main objective of this study was to evaluate the impact of harvester header,harvester type,and weather conditions on field loss and milling quality of rough *** popular harvesters equipped with different headers:John Deere 9870 with header D60-S,John Deere 9860 with header D972-S,Hardy,and John Deere 9770 with stripper header were evaluated in this *** header and total field losses of rice were evaluated for each harvester under regular,rainy and windy weather *** were conducted in a rice field cultivated with medium grain rice,variety M206,at Grimes,*** rice yield(TRY),head rice yield(HRY)and whiteness index(WI)were examined to evaluate the effect of weather conditions on milling *** obtained results revealed that the rice field loss was affected by harvester header and type,and weather *** the conventional headers,D60-S significantly reduced the rice loss compared to the D972-S and the *** with John Deere 9860 resulted in significant header and field loss compared to other tested *** average loss increased from 236.2 kg/hm^(2)and 445.2 kg/hm^(2)under regular condition to 711.1 kg/hm^(2)and 907.9 kg/hm^(2)under windy condition for John Deere 9870 and John Deere 9860,*** corresponding loss percentages increased from 2.6%and 4.9%to 7.9%and 10.1%.HRY was significantly affected by weather condition at harvest ***,the weather condition had no significant effect on TRY and *** minimize the rice field loss and obtain good milling quality,commercial rice harvesting during regular weather conditions is important.A proper combination of harvester type and header could be vital for reducing the rice loss.

关键词： rice harvesters field loss weather conditions milling quality harvester header

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Drying characteristics and quality of bananas under infrared radiation heating

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International Journal of Agricultural and Biological Engineering 2013年第3期6卷 58-70页

作者： Milly A.Pekke Zhongli Pan griffiths G.atungulu Gary Smith James F.Thompson Department of Food Science and Technology University of California DavisDavisCA 95616USA Processed Foods Research Unit USDA-ARS Western Regional Research CenterAlbanyCA 94710USA Department of Biological and Agricultural Engineering University of California DavisDavisCA 95616USA Department of Food Science University of ArkansasFayettevilleAR 72704USA

Hot air(HA)drying of banana has low drying efficiency and results in undesirable product *** objectives of this research were to investigate the feasibility of infrared(IR)heating to improve banana drying rate,evaluate quality of the dried product,and establish models for predicting drying *** slices of 5 mm and 8 mm thickness were dried with IR and HA at product temperatures of 60℃,70℃ and 80℃.Banana drying characteristics and changes in residual polyphenol oxidase(PPO),Hydroxymethylfurfural(HMF),color,moisture content(MC)and water activity during the treatments were *** showed that significant moisture reduction and higher drying rates were achieved with IR drying compared to HA drying in the early *** drying data could be fitted to the Page model for accurate prediction of MC change for IR and HA drying with mean R2 of *** was noted that enzyme inactivation occurred more quickly with IR than with HA drying.A unique response of PPO under IR and HA drying was *** heating of banana inactivated PPO within the first 20 min of drying at 60℃,70℃ and 80℃,while PPO was first activated before inactivation at 60℃ and 70℃ drying with *** highest HMF content occurred in banana slices with 5 mm thickness dried with IR at a product temperature of 80℃.It is therefore recommendable to dry banana with IR at product temperature of 70℃ or below to preserve the product *** findings are new and provide more insight in the application of IR heating for drying banana for improved drying rate and product quality.

关键词： drying banana infrared radiation hot air drying enzyme inactivation

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High Power Microwave Treatment Impacts on Microbes in Rough Rice

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Rice science 2024年第2期31卷 139-141,I0020,I0021页

作者： Faith OUMA Luthra KAUSHIK Boreddy SREENIVASULA Oduola ABASS griffiths G.atungulu Department of Food Science University of Arkansas Division of AgricultureFayetteville 72704USA Department of Processing and Food Engineering Dr.NTR College of Agricultural EngineeringBapatla 522101India

As rice consumption increases,ensuring its safety has become a priority for the food *** address this concern,the industry is exploring a single-pass microbial inactivation treatment at the rough rice *** this study,a long-grain rice variety,RT7321[21.2%wet basis(WB)and a 20 mm bed thickness]was exposed to microwave radiation(915 MHz frequency)at powers of 16,18,and 20 kW for durations of 1,2,and 3 *** found that the highest microwave power(20 kW)and the longest exposure duration(3 min)produced the greatest reduction in total aerobic count and total fungal count,reducing them by up to 1.21 and 5.01 log(CFU/g),*** findings provided insights into the used to high-power,shortduration 915 MHz microwave technology for decontamination purposes in rough rice to help improve the microbial safety of *** aim is to develop a single-pass drying approach for microbial inactivation in rice processing facilities while ensuring that the yield and quality is not compromised.

关键词： microwave insight facilities

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