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Volume 51 (2020)
- Issue 4 Pages 112-
- Issue 3 Pages 77-
- Issue 2 Pages 49-
- Issue 1 Pages 1-
Volume 51, Issue 1
Vol. 51, No. 1 (Ser. No. 164)
Displaying 1-3 of 3 articles from this issue
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Masatsugu TAMURA, Kana KOMATA, Daigo INOUE, Takahiro SAITO2020 Volume 51 Issue 1 Pages 1-11
Published: 2020
Released on J-STAGE: September 28, 2023
JOURNAL OPEN ACCESSThe object of present study was to establish indicators to visualize sensory-evaluated hop aroma. Sensory evaluation of aroma of 7 varieties hop was characterized by 5 craft beer brewers in Tochigi prefecture, and was examined for its visualization method. Aroma of eight varieties of hop was prepared as an original aroma (OA) and an extracted aroma (EA) simulating dry hopping. The hop aroma index simulated the beer brewing process was verified by sensory evaluation of 9 craft beer brewers in Tochigi prefecture using OA and EA. Questionnaire surveys were conducted in October 2016 (n=79) and January 2017 (n=27) targeting craft beer brewers from all over Japan. As a result, it was revealed that hops for the brewers were highly important and that there was little information of aroma at the time of purchase. Furthermore, a visual hop aroma indicator was desired by 89 % of the brewers. Therefore, a hop package example of a 6-level scale radar chart consisting of five sensory evaluation terms (fruity, floral, herbal, spicy, citrus) with a text explanation was proposed as an indicator of hop aroma during brewing.View full abstractDownload PDF (1592K) -
Fumiyuki GOTO, Hitoshi TERAZOE, Atsushi YOMOTA, Hideki MORIYA, 和博 庄子2020 Volume 51 Issue 1 Pages 12-19
Published: 2020
Released on J-STAGE: September 28, 2023
JOURNAL OPEN ACCESSThe occurrence of leaf mold disease and other diseases is a concern in greenhouses, especially in spring and autumn because relative humidity in greenhouses rises at night. It is known that a heat pump has multiple functions not only heating but also air conditioning, dehumidification, and air blowing. We carried out comparative tests using two isomorphic greenhouses for tomato cultivation: a greenhouse equipped with two heat pumps (test area) and the other a kerosene heater (control area). Cultivation tests of tomato was carried out in autumn and spring in order to investigate the effect of dehumidification using two heat pumps. One heat pump was used for heating and the other for cooling. Both heat pumps were driven for 30 min. in 4 times at night. Leaf mold disease was seldom observed in the greenhouse installed with heat pumps for dehumidification. On the contrary, in the control greenhouse, leaf mold disease was observed in every experiment. No difference was observed between the two greenhouses in the weight of fruits, flowering time, number of flowers and the Brix value. The energy consumption of the control and test greenhouses during the cultivation period of spring was 10 817 MJ and 4618 MJ, respectively. Approximately 27 % of the energy consumption in the test greenhouse was used for dehumidification. In conclusion, dehumidification using heat pumps was effective for tomato cultivation by preventing leaf mold disease.View full abstractDownload PDF (2187K) -
Takuma GENKAWA, kumar GARG Pankaj, AHAMED Tofael, Ryozo NOGUCHI2020 Volume 51 Issue 1 Pages 20-27
Published: 2020
Released on J-STAGE: September 28, 2023
JOURNAL OPEN ACCESSThe performance of a low-temperature keeping system for fruits and vegetables was investigated using a refrigerant plate, the melting point of which is configurable within the chilled range. Young leaves of Japanese mustard spinach and the fruits of strawberry were sealed in a film bag and stored in an insulating container with refrigerant plates for a few days, and the temperature, relative humidity (RH), and qualities before and after storage were measured. The results indicated that the interior of the insulating container was maintained at a low temperature and a high RH for a few days, and that the fluctuations in temperature and RH were smaller than those obtained by mechanical refrigeration with an on-off control and defrosting. Moreover, there was no difference in qualities before and after storage. From these results, it was shown that the low-temperature keeping system using the refrigerant plates is a powerful tool for filling gaps in the cold chain logistics of exporting Japanese fruits and vegetables.View full abstractDownload PDF (2098K)
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