Journal of the Society of Agricultural Structures, Japan
Online ISSN : 2186-0122
Print ISSN : 0388-8517
ISSN-L : 0388-8517
Search
Advanced search
OR
Browse
Search
Volume 49, Issue 4
Vol. 49, No. 4 (Ser. No. 159)
Displaying 1-4 of 4 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
  • Recent Development in Research and Technology Related to Agricultural Facilities
    -Greenhouse Environment and Control-
    Sadanori SASE
    2018 Volume 49 Issue 4 Pages 143-148
    Published: 2018
    Released on J-STAGE: September 07, 2023
    DOIhttps://doi.org/10.11449/sasj.49.4_143
    JOURNAL OPEN ACCESS
    Download PDF (738K)
  • Viscosity Measurement Method Using Central-mode Piezoelectric Resonator Embedded in Bottom of Plastic Vessel
    Takahiro ADACHI, Koichi MIZUTANI, Naoto WAKATSUKI, Tadashi EBIHARA
    2018 Volume 49 Issue 4 Pages 149-156
    Published: 2018
    Released on J-STAGE: September 07, 2023
    DOIhttps://doi.org/10.11449/sasj.49.4_149
    JOURNAL OPEN ACCESS
    Show abstractHide abstract
    In this paper, a viscometor suitable for food-processing process is proposed. This viscometer can measure a small amount of liquid, be easy to care, and embed in pipe. This viscometer has disk-shaped piezoelectric resonator embedded in bottom or wall of vessel and pipe. Viscosity is obtained by estimating equivalent circuit parameters of piezoelectric resonator at resonance. To measure viscosity in the case of gluing the circumference of the resonator to the vessel, center of the piezoelectric resonator is vibrated by proposed electrode arrangement. To verify effectiveness of proposed viscometer, the viscometer was made and relationship between resistance Rs obtained by equivalent circuit of piezoelectric resonator and viscosity η of standard liquid of calibrating viscometor was confi rmed. In this confi rming, standard liquid of calibrating viscometor as measurement sample was 10 mL. As a result, radial-mode vibration did not give one-to-one correspondence η and Rs. However, central-mode vibration gave one-to-one correspondence η and Rs, and η was proportional to Rs2 in the range of 9.1 - 478 (mPa・s). Therefore, proposed viscometor can be embedded bottom of vessel, and measure a small amount of sample. Thus, it was shown that proposed viscometor is suitable for food-processing process.
    View full abstract
    Download PDF (1273K)
  • Collapse Process and Reinforcement Effects of Pipe-framed Greenhouses under Snow Loading based on a 3-D Analysis
    Kazuya TAKAHASHI, Yasushi UEMATSU
    2018 Volume 49 Issue 4 Pages 157-163
    Published: 2018
    Released on J-STAGE: September 07, 2023
    DOIhttps://doi.org/10.11449/sasj.49.4_157
    JOURNAL OPEN ACCESS
    Show abstractHide abstract
    The present paper investigates the collapse process of pipe-framed greenhouses under snow loading based on a fi nite element analysis in order to establish more reasonable snow resistant design of these structures. Three snow load distribution patterns under the effects of wind and/or solar radiation are considered. In the analyses, both geometric and material non-linearity are taken into account. Furthermore, the effects of buckling and initial geometric imperfection similar to the buckling mode are also considered. Both 2-D and 3-D analyses are carried out. The effect of reinforcement by adding members on the collapse process is made clear. The result on the collapse process is consistent with the practical damage caused by heavy snowfall. The effects of various reinforcements made on the frame are discussed based on the similar analyses up to the ultimate state. The results show the effective reinforcement methods from the viewpoint of snow resistant design.
    View full abstract
    Download PDF (1710K)
  • Trends and Functional Analysis of ICT Energy-Environment Monitoring Systems of Greenhouses
    Ryota TSUCHIYA, Kazuhiro MOCHIDZUKI, Limi OKUSHIMA, Masahisa ISHII, To ...
    2018 Volume 49 Issue 4 Pages 164-172
    Published: 2018
    Released on J-STAGE: September 07, 2023
    DOIhttps://doi.org/10.11449/sasj.49.4_164
    JOURNAL OPEN ACCESS
    Show abstractHide abstract
    Numerous types of ICT (Information and Communication Technology) monitoring systems have been developed to help farmers of greenhouse horticulture easily understand the environmental condition within their greenhouses. In addition, these monitoring systems are also effective to optimize the amount of energy required to control its environment. In this paper, the function trends of ICT greenhouse monitoring systems, already commercialized in Japan, are reviewed with respect to monitoring items, functions, installability, and ICT ability and the recently developed ICT energy-environment monitoring system is characterized based on the review. These trends were analyzed using information from websites and catalogues of existing products. The properties of each product were then visually summarized in radar charts using fi ve scores. The radar charts for the new system suggest the need to improve its installability and expand its support functions for farmers.
    View full abstract
    Download PDF (1017K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top