In this study, the authors made a non-steady state simulation model of the thermal environment and comfort in the rooms where plants were placed. The room which was assumed in the simulation model was the same room that used in our previous experiment (Asaumi et al., J. Archit. Plann. Environ. Eng., AIJ, 464, 1994) . Ornamental foliage plants which were assumed to be placed in the room were Schefflera arboricola “Hong Kong, ”Dracaena fragrans“Massangeana, ”Ficus benjamina and Epipremnum aureum, and the stomatal resistances and shading ratios measured in our previous experiment (Asaumi et al., SHITA J., 4 (2), 1993) were applied. Simulation was conducted concerning the data on January 5, 1993, and the results were compared with the results of our previous experiment (Asaumi et al., 1994) . Furthermore, simulation was conducted concerning the data on the standard sunny day in April. The results of the simulation of January 5, 1993 showed the same tendency as the results of our previous experiment (Asaumi et al., 1994), so the simulation model was considered to be valid. Therefore, the simulation model is useful for the design of the thermal environment and comfort in rooms where plants are placed.
CELSS is to be considered in constructing a closed environment for sustaining life including human beings in space stations and space colonies. The waste management system is a key subsystem of the integrated material recycling system which must be developed to support long-term manned space activity. This paper presents the results of waste processing of rabbit feces using wet oxidation of waste manegement system. It was considered 75% of N in feces were converted to N2 gas, 60% of Ca in feces remained in the furnace and K in feces were smoothly dissolved in the solution. The insoluble residue contained most of P and Fe in feces. The wet oxidized solution contained Ni and Cr which were eluted from the furnace made of SUS. It was found that the nutrient balance of a wet oxidized solution which added P and Fe, removed Ni and Cr, were not so different compared with a hydroponic solution.
This study was conducted to decrease fruit cracking of cherry tomato by low osmotic potential solution treatment in hydroponics. Plants cultured in standard concentration of nutrient solution (-0.12 MPa), were transferred only at nighttime (9 PM to 9AM) to low osmotic solution, -0.24 or -0.36 MPa using 40 or 90 mM PEG, respectively. Fruit cracking in -0.36 MPa treated plants decreased to 65% of PEG-free control plants. Fruit and leaf water potentials of the -0.36 MPa treated plants were lower than those in the control plants at nighttime. Based on the above results, it was suggested that water absorption of plants was suppressed by PEG treatment resulting in decrease in fruit cracking. Fruit size, Brix and hardness were not influenced with this treatment.