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論文(リポジトリ) |
論文(リポジトリ)
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Sugawara, Akira ; Nakamikawa, Satoru ; Kageyama, Masaya ; Yamazaki, Satoshi ; Abe, Naoto ; Kawasaki, Kazumasa ; Matsubara, Koji
概要:
An air-cooling system of a small capacity of several kilo-watts using only water refrigerant as a non-CFCs (Chlorofluorocarbon) technology is examined. The experimental device consists of two stages. The first stage is composed of a
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vacuum pump and a vacuum chamber of about 60 L in volume. The second stage has two heat exchangers (the exchanger located outside the vacuum chamber is a dummy cooling load) and a water circulating pump. An air-conditioner indoor unit or a heater is used as a dummy cooling load. The temperature and humidity characteristics are measured at each place. Consequently, the ability to cool the room air is ensured by an air-cooling system using only water refrigerant. A new vacuum pump, that can exhaust a large amount of water vapor, is developed and its properties are measured. It seems that the engine-based vacuum pump performance is sufficient to drive the air cooling system with water refrigerant.
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| 2.
論文(リポジトリ) |
論文(リポジトリ)
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Kawasaki, Kazumasa ; Fukazawa, Katsuya
概要:
The corrective machining to compensate the resulting errors is usually tried at plural times based on the trial-and-error process when the machining is realized in die and mold manufacturing. This corrective machining has an influence on
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accuracy and efficiency and is an important factor. The measurement system for measuring the forms of die and mold at all times is essential in order to machine the die and mold with high accuracy and efficiency. However, the problems of management and operation errors are found in compensating process of die and mold machining. In this paper, an online machining and measurement system in die and mold manufacturing is developed in order to overcome these problems. In this online system, 2-axis control system is added to a surface roughness measuring instrument, and both NC machining program and measured data are linked and controlled using a same computer. Therefore, the machining and measurement can be recognized for consistent process, and can be realized on the machine. This system has the advantages such as the high accuracy, low-price, and online convenience and so on. The possibility of practical use of this online system was investigated by fundamental experiments.
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| 3.
論文(リポジトリ) |
論文(リポジトリ)
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Kawasaki, Kazumasa
概要:
University-industry collaborations have been recognized as an important factor for the creation of innovation. Although the university-industry collaborations have been mainly conducted by large companies in Japan so far, the small-medium
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companies rather than large companies are accumulated in regional areas. However, there are a lot of problems in the university-industry collaborations of the small-medium companies. In this paper, the collaborations between small-medium companies and universities are analyzed based on joint research projects. The results show that the joint research projects of small-medium companies for collaboration partners are not conducted enough. Moreover, the results also show that the average budget per project of small-medium companies is low according to the detailed data of Niigata University. The active area of company and university in research and development is discussed. The stage map that proceeds to commercialization for the collaborations between small-medium companies and universities is made and discussed. Based on these results, the problems of the university-industry collaborations of small-medium companies for collaboration partners are extracted.
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