![]() The sample for HPS is used with a form of sheet or rod. The process of high- pressure sliding ( HPS) is a method of severe plastic deformation developed recently for grain refinement of metallic materials under high pressure. Takizawa, Yoichi Masuda, Takahiro Fujimitsu, Kazushige Kajita, Takahiro Watanabe, Kyohei Yumoto, Manabu Otagiri, Yoshiharu Horita, Zenji ![]() Scaling up of High- Pressure Sliding ( HPS) for Grain Refinement and Superplasticity Under HPS lamps, the leaves of both cultivars were slightly less green with very little red pigmentation ('Rub圜onn') and slightly elongated, compared to CWF, but plant productivity per unit electrical energy input was vastly superior with HPS. ![]() It was postulated that the considerable output of 700 to 850 nm radiation from the HPS lamp was a significant factor of the increased yield. Radiation from high- pressure sodium ( HPS) lamps provided more than a 50% increased yield (fresh and dry weight of tops) of loose-leaf lettuce cultivars Grand Rapids Forcing and Rub圜onn, compared to that obtained by radiation from cool-white fluorescent (CWF) lamps at equal photosynthetic photon flux yet, input wattage was approximately 36% less. Results indicate that employment of HPS or other blue-deficient sources for lighting at low to moderate photosynthetic photon flux levels may cause abnormal stem elongation, but this can be prevented by the addition of a small amount of supplemental blue light.Ĭomparison of fluorescent and high- pressure sodium lamps on growth of leaf lettuce Total photosynthetic photon flux levels, including blue fluorescent, were maintained near 300 or 500 micromol/sq m s. To study high- pressure sodium ( HPS) lamps used for plant lighting because of their high energy conversion efficiencies, 'McCall' soybean plants were grown for 28 days in growth chambers utilizing HPS lamps, with/without supplemental light from blue phosphor fluorescent lamps. Soybean stem growth under high- pressure sodium with supplemental blue lighting
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