All issues
Volume 31 (2000 - 200･･･
- Issue 4 Pages 197-
- Issue 3 Pages 145-
- Issue 2 Pages 79-
- Issue 1 Pages 1-
Volume 31, Issue 2
Displaying 1-5 of 5 articles from this issue
- |<
- <
- 1
- >
- >|
-
Rokhani HASBULLAH, Gardjito, Atjeng M. SYARIEF, Takayoshi AKINAGA2000 Volume 31 Issue 2 Pages 79-86
Published: September 25, 2000
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSA steady state concentration increase method was developed for the simultaneous measurement of the gas permeability coefficient of plastic films to oxygen, carbon dioxide, and nitrogen. Several polypropylene and polyethylene plastic films with a thickness of 15μm were used in this experiment. The permeability coefficients of the plastic films to carbon dioxide, oxygen, and nitrogen were measured at 8, 14, 20, and 26°C. The results show that temperature has a significant effect on the permeability coefficients of all the gases tested (O2, CO2, N2). The gas permeability coefficients increase with increasing temperature. The temperature effect on gas permeability coefficients could be expressed by an Arrhenius equation with the coefficient of determination (R2) values ranging between 0.904 and 0.999. The ratio of permeabilities of CO2 to O2 at 25°C are 2.0 and 4.0 for the polypropylene and polyethylene films, respectivelyView full abstractDownload PDF (717K) -
Effects of glycerol on the physical properties of the filmsWimolrat CHEAPPIMOLCHAI, Keo INTABON, Yutaka ISHIKAWA, Takaaki MAEKAWA2000 Volume 31 Issue 2 Pages 87-94
Published: September 25, 2000
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSIn this study, the suitability of mungbean protein as a raw material to produce biodegradable film was tested in comparison with soy protein. Protein from mungbean seed was extracted by acid precipitation at pH 4.5 using acetic acid. Protein content of the isolated mungbean protein was 81.93%. Films were prepared by dissolving either proteins of mungbean or soybean with water at pH 7.0 and casting onto a teflon plate. Effect of glycerol concentration on three physical properties of the film: tensile strength (TS), percentage elongation (% E) and water vapor permeability (WVP) were investigated. TS of films decreased with increasing glycerol concentration. In contrast, % E and WVP of films increased with increasing glycerol concentration. Mungbean protein can be used as a raw material to produce biodegradable film.View full abstractDownload PDF (888K) -
Hirakazu SEKI2000 Volume 31 Issue 2 Pages 95-104
Published: September 25, 2000
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSA master equation was derived for a batch composting process, considering the principal state variables of the process as random variables. Using the first and second moments of the random variables obtained from the master equation, a method was developed for predicting the expected values and their standard deviation theoretically. After estimating the value of unit concentration step ε for the stochastic process, from the experimental results of standard deviation of temperature in the compost mass, the stochastic model simulation was carried out. Calculated result of standard deviation of substrate concentration at the end of the experiment agreed well with the experimental result.View full abstractDownload PDF (1060K) -
Simulation Analysis of Seedling Block DynamicsManzo UCHIGASAKI, Kengo WATANABE, Seishu TOJO, Kazuhiro SERATA, Shingo ...2000 Volume 31 Issue 2 Pages 105-112
Published: September 25, 2000
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSA simulation program for a transplanting system employing a piston-activated vacuum was developed and tested. The effects of four basic parameters upon the characteristics of movement of the transferred seedling block, namely the velocity of the seedling block and the rate of consumed energy. The terminal velocity of the seedling block was presumed to be the velocity at the door attached to the end of the drop tube. The simulation program was validated by the results of laboratory test. Further, in order to provide free of harm dislodging of seedlings from tray cells by high speed pull-out and consequent soft landing in plant-beds at low velocity, double acting pneumatic cylinder was incorporated in the plant transferring system. Experimental and simulation trials were conducted for diameters of drop tube 34mm and 43mm. The experimental terminal velocity was generally higher than the simulated terminal velocity.View full abstractDownload PDF (3557K) -
Qingyun CHEN, Tomoharu YAMAGUCHI, Takeshi KUROYANAGI2000 Volume 31 Issue 2 Pages 113-118
Published: September 25, 2000
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSThe energy-saving sun-light greenhouse is the most successful and unique facility in protected horticulture in China. This type greenhouse is very different from normal pipehouse or glasshouse in the structures, in which there are three-side non-transparent walls. The energy resource of the greenhouse comes mainly from the solar radiation that is the reason why they were named as sunlight greenhouse. Because the wall's powerful thermal reservation, very fruit vegetables such as cucumbers, tomatoes can be planted in the sun-light greenhouses without heating or only with little heating in the winter in north China. In this paper the development, basic structures and environmental characteristics of the sunlight greenhouse are introduced.View full abstractDownload PDF (4857K)
- |<
- <
- 1
- >
- >|