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Ethylene had an undesirable effect on the quality of kiwifruits, bananas, broccoli, and spinach leaves that were prepared and stored as lightly processed products. A 2.or 20 ppm ethylene treatment hastened the softening of the pulp of kiwifruits and bananas held at 20°C. Use of charcoal with palladium chloride, as ethylene absorbent, prevented the accumulation of the ethylene and was effective in reducing the rate of softening in kiwifruits and bananas and of chlorophyll loss in spinach leaves, but not in broccoli. 相似文献
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A new fufurylidene derivative which tastes bitter was separated from lactose heated at 200°C for 20 hr by ethyl acetate extraction and preparative thin-layer chromatography. The compound was identified as the trans isomer of 1,6-anhydro-3,4-O-furfurylidene-β-D-galactopyranose by ultraviolet, infrared, mass and 1H-NMR spectroscopy. The compound and its cis isomer were identified in the reaction mixture of furfural and levogalactosan heated at 175°C for 2 hr with nitric acid. 相似文献
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AKESHI TAKAHASHI TOSHIAKI TANAKA HIROYUKI FUJITA YUKI HIRANUMA SATOSHI ICHIMURA KAZUHIRO WATANABE MIEKO KASHIWAGI TETSUYA MAEJIMA 《Electrical Engineering in Japan》2018,204(3):41-52
This paper presents the development results of a ?1 MV dc filter and dc measurement systems for an ITER (International Thermonuclear Experimental Reactor) neutral beam injector (NBI) system. High accuracy of 0.5% and fast responsivity of 3.3 μs, ?3 dB are required for the dc measurement systems: both dc voltage dividers and DCCTs. Circuit design and thermal flow design were carried out to clarify and minimize their effects on the accuracy and responsivity. The validity of the established design was demonstrated by the actual‐product tests; temperature rise of each components fell below the allowable value; inner components of dc filter withstood dc ?1.2 MV; each voltage divider accurately measured the voltage during the dc ?1.2 MV withstand voltage test; the voltage dividers and the DCCTs were adequate to the requirements of responsivity (3.3 μs, ?3 dB). 相似文献
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TETSUYA OJIRO HIDEKI HONDA KAZUHIRO TSURUTA TSUYOSHI HANAMOTO 《Electrical Engineering in Japan》2018,203(2):39-46
At present, many industrial carrier devices utilize linear motor sliders. However, a heavier load requires a linear motor (which is an example of a direct drive device) to get higher power, compared with a rotary motor with a ball screw slider (which is an example of an indirect drive device). In order to obtain higher power at a lower cost, a linear slider with multiple motors can be utilized, for example, a gantry type linear motor slider. Moving the gantry type slider requires two linear motors that are set up in parallel to enable synchronization control. Some conventional synchronization control methods have been proposed for the parallel twin linear slider; however, a large‐scaled gantry type linear motor slider has two unique problems: mechanical distortion caused by the limitations of installation environment and coupling caused by joints with low stiffness. This paper proposes a control model to solve these problems, and an identification method of each parameter. Furthermore, the effectiveness of the control model is verified by comparison with simulation results and experimental results. 相似文献
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Skim milk and aqueous milk protein suspensions were ultrafiltered in a tubular module under controlled conditions (temperature, pressure, flow rate) and were subsequently rinsed with water also under controlled conditions. The effect of rinsing on the deposited layer was followed by observing the flux with time. Ultrafiltration and rinsing should be carried out at high flow rates and at low pressures. Increasing the pressure led to an undesirable increase in the compactness of the deposit. Theoretical considerations of the mechanism of transport in and at the deposited layer made it possible to obtain data on the thickness of the deposits, on mass transfer coefficients and velocity profiles within deposits. The experimental rinsing curves could be well explained by the calculated results. The results should help to optimize the performance and cleaning of UF modules. 相似文献
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KAZUHIRO TOYODA 《Electrical Engineering in Japan》2018,203(4):25-30
Spacecraft need high‐voltage power generation for high power. However, the high voltage can cause severe discharge problem on spacecraft. This paper describes the mechanism of spacecraft charging and discharging. Mitigation methods are also mentioned. 相似文献
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HIROKI WATANABE KAZUHIRO KOIWA JUN‐ICHI ITOH YOSHIYA OHNUMA SATOSHI MIYAWAKI 《Electrical Engineering in Japan》2016,196(3):39-48
This paper proposes a configuration of a single‐phase voltage source inverter that features power decoupling capability. Generally, the converter connected to a single‐phase grid employs bulky dc link capacitors such as electrolytic capacitors in order to decouple the power ripple with twice the frequency of the power supply. The power ripple in the proposed circuit is compensated by an active buffer with small capacitors. In this paper, the fundamental operations of the proposed converter are confirmed by experimental results. From the experimental results, the output current total harmonic distortion (THD) is 3.51%, the ratio of the input current is 14.3%, and the output power factor is over 99%. In addition, the volume of the proposed circuit is reduced by 61% when the carrier frequency is 64 kHz compared to that with a carrier frequency of 16 kHz. Finally, from an evaluation of the power density using Pareto front curves, the proposed circuit achieves high power density in comparison with the conventional circuit. 相似文献
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MICHIO INAGAKI KAZUHIRO URASHIMA SHINSUKE TOYOMASU YASUO GOTO MOTOTSUGU SAKAI 《Journal of the American Ceramic Society》1985,68(12):704-706
The work of fracture, γwoF, of a soda-lime-silica glass was determined as 5.5 J/m2 in an inert atmosphere and 4.4 J/m2 in air by using a short bar specimen with a chevron notch. The critical stress intensity factor KIC calculated from γwof obtained in an inert atmosphere agreed with the value, 0.88 MN/m3/2 , determined by the indentation method. In unloading-loading cycles during stable crack growth, crack healing was observed both on the diagram of load vs load-point displacement and visually. Crack healing is more prevalent in an inert atmosphere, occurring only minimally in air. The energy for healing was measured as 0.65 J/m2 in an inert atmosphere and ∼0.21 J/m2 in air. 相似文献
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H.IDEKO ARIGA T.ADASU URASHIMA E.IJI MICHIHATA M.ANABU ITO N.OBUHIRO MORIZONO T.SUTOMU KIMURA S.ETSUKO TAKAHASHI 《Journal of food science》1992,57(3):625-628
Strains of S. thermophilus grown on partially deproteinized whey produced an exocellular polysaccharide which contained L-rhamnose and D-galactose in the ratio 1:1.47. Methylation analysis showed the existence of 3 and 6-substituted D-galactose, 2-substituted L-rhamnose and nonreducing terminal D-galactose. A polysaccharide was also obtained from the cell surface after sonication. Molecular weights of both polysaccharides were estimated by gel filtration on HPLC at about 9,000,000 and 1,100,000, respectively. These polysaccharides were different from the previously reported products by S. thermophilus strains and their presence may contribute to the ropy property of yogurt. 相似文献