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Bai G.,Niigata University | Nakano K.,Niigata University | Ohashi S.,Niigata University | Mizukami T.,Bio oriented Technology Research Advancement Institution | And 3 more authors.
Atomization and Sprays | Year: 2016

Flat-fan air inclusion nozzles, usually with a high-pressure range of 1-1.5 MPa, have been widely used as one of the best drift control methods on agricultural boom sprayers in Japan. To get a better understanding of the relationship between the nozzle design parameters (pre-orifice diameter and final orifice area) and the initial spray characteristics (droplet size characteristics, spray angle, liquid flow rate, and included air within droplets), the influence of the above parameters of the KIRINASHI ES series nozzles on the initial spray characteristics was investigated under different nozzle pressures. The results show that the pre-orifice diameter, final orifice area, and nozzle pressure significantly affect the volume median diameter (Dv0.5). In addition, the nozzle pressure and the pre-orifice diameter had positive correlations with the spray angle while the pre-orifice diameter and the final orifice area significantly influenced the spray liquid density which can indicate the quantity of included air within droplets. The corresponding multivariate regression analysis was carried out and relatively high values of the coefficient of determinations (R2) were obtained between several nozzle parameters and the Dv0.5, and also the spray liquid density and the liquid flow rate. © 2016 by Begell House, Inc. Source

Nguyen V.N.,Bio oriented Technology Research Advancement Institution | Inaba S.,Saga University
Journal of Terramechanics | Year: 2011

The objective of this study was to evaluate the effects of agricultural tire characteristics on variations of wheel load and vibrations transmitted from the ground to the tractor rear axle. The experiments were conducted on an asphalt road and a sandy loam field using a two-wheel-drive self-propelled farm tractor at different combinations of tractor forward speeds of approximately 0.6, 1.6 and 2.6 m/s, and tire inflation pressures of 330 and 80 kPa. During experiments, the vertical wheel load of the left and right rear wheels, and the roll, bounce and pitch accelerations of the rear axle center were measured using strain-gage-based transducers and a triaxial accelerometer. The wavelet and Fourier analyses were applied to measured data in order to investigate the effects of self-excitations due to non-uniformity and lugs of tires on the wheel-load fluctuation and rear axle vibrations. Values for the root-mean-square (RMS) wheel loads and accelerations were not strictly proportional and inversely proportional to the forward speed and tire pressure respectively. The time histories and frequency compositions of synthesized data have shown that tire non-uniformity and tire lugs significantly excited the wheel load and accelerations at their natural frequencies and harmonics. These effects were strongly affected by the forward speed, tire pressure and ground deformation. © 2010 ISTVS. Published by Elsevier Ltd. All rights reserved. Source

Fujii Y.,Bio oriented Technology Research Advancement Institution | Ohnishi M.,Japan National Agriculture and Food Research Organization | Tsuga K.,Japan National Agriculture and Food Research Organization
Engineering in Agriculture, Environment and Food | Year: 2014

We performed a Customer Satisfaction (CS) Portfolio analysis targeted at farmers who had bought a Welsh onion harvester. Subsequently we also performed a conjoint analysis to assess farmers' preferences for simulated concepts of an improved harvester based on their likes and dislikes. Our results showed that farmers had high expectations of but low satisfaction with some attributes (e.g., price), while they had low expectations but high satisfaction with other attributes (e.g., earth separation performance). It also showed that the responding farmers with a greater area under cultivation were more interested in the size of the harvester and its working efficiency than in price. These results suggest ideas for machine development and improvement and their order of priority. © 2014, Asian Agricultural and Biological Engineering Association. Published by Elsevier B.V. All rights. Source

Kanai G.,Japan National Agriculture and Food Research Organization | Kato H.,Japan National Agriculture and Food Research Organization | Umeda N.,Bio oriented Technology Research Advancement Institution | Okada K.,Japan International Research Center for Agricultural science | Matsuzaki M.,Japan National Agriculture and Food Research Organization
Japan Agricultural Research Quarterly | Year: 2010

We examined drying condition and its effects on qualities of rapeseed and sunflower, especially on oil qualities as measured by POV (peroxide value), AV (acid value) and color of oil. Initial moisture contents for rapeseed (Norin-48, Kirariboshi) were 38.7% w.b., 31.1% and 15.1% and for sunflower (Pioneer 63M80, Harurinzo) 31.5% w.b. and 15.8%. Each sample was dried unheated in a ventilation dryer for 24 hr, dried in an oven at 45°C, 55°C or 65°C for 24 hr, or dried in a circulating dryer (capacity: 1t) at unheated-55°C for 11 hr. Samples were expressed for oil with a small expeller. The oil samples were examined for POV, AV and the color of oil. POV of rapeseed oil was from 0.8 meq/kg for 45°C drying with 15.1% initial moisture content to 10.8 meq/kg for 65°C with 38.7% initial moisture content. POV of sunflower oil was from 1.9 meq/kg for 45°C drying with 15.8% initial moisture content to 6.8 meq/kg for 65°C with 31.5% initial moisture content. The early harvested rapeseed dried under higher temperature conditions had not only low oil quality measured by POV but also a green color stemming from chlorophyll. For AV a tendency that grain with higher moisture contents had higher AV was implied. According to the results, to avoid the degradation of oil quality the grain should be mature and initial moisture contents low enough to prevent deterioration; if the harvested rapeseed or sunflower grain have high moisture content, drying at lower temperatures is better to maintain the qualities of oil. Source

Jang S.,University of Tsukuba | Kitamura Y.,University of Tsukuba | Yoshida S.,University of Tsukuba | Yamasaki H.,Bio oriented Technology Research Advancement Institution
Food Science and Technology Research | Year: 2011

Nagamo (Sargassum horneri) processing residue was extracted using a hot water extraction method at various temperatures and solvent/material ratios and analyzed for total sugar (TS). The extraction characteristics of TS were characterized by Peleg's model, and the optimum extraction conditions for the Nagamo processing residue were obtained at 85°C at a solvent/material ratio of 5. At experimental temperatures and solvent/material ratios, the TS content increased rapidly for the first 2 h and then reached the equilibrium concentration. Additionally, the antioxidant activity (SOD) of the extraction was 60.8% or higher. Thus, it was concluded that the Nagamo processing residue contains biologically active polysaccharides, which can be obtained by using a transportable 400 L-batch extraction process with hot water. Source

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