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Further Stabilization and Power Density Improvement of Stack-Type Thermoelectric Power Generating Module with Biphasic Medium by Using Various Flexible Metals as Electrodes

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Journal of Power and Energy Engineering 2018年第11期6卷 78-86页

作者： Seiichi Deguchi Shoichiro Imaizumi hajime arimura Keisuke Sawada Noriyuki Kobayashi Norifumi Isu Kenji Sakai Kentaro Kimoto Department of Energy Engineering and Science Nagoya University Nagoya Japan Kitchen and Bathroom Technology Research Institute LIXIL Corporation Tokoname Japan Materials System Division Toshima Manufacturing Corporation Ltd. Saitama Japan

In order to realize further stability of a stack-type thermoelectric power generating module (i.e. no electrical connections inside), flexible materials of metal springs and/or rods having restoring forces were installed between lower-temperature-sides of thermoelectric elements. These flexible materials were expected to play three important roles of interpolating different thermal expansions of the module components, enlarging heat removal area and penetration of any media through themselves. Then, a low-boiling-point medium (i.e. NOVEC manufactured by 3M Japan Ltd.) was also applied for a high-speed direct heat removal via its phase change from the lower-temperature-sides of the thermoelectric elements in the proposing stack-type thermoelectric power generating module. No electrical disconnections inside the module were confirmed for more than 9 years of use, indicating further module stability. The power generating density was improved to about 120 mW·m-2 with SUS304 springs having 0.7 mm diameter. Increasing power generating density can be expected in terms of suitable selection of flexible metal with high Vickers hardness, cavities control on the spring surface, more vigorous multiphase flow with adding powders to the medium and optimization of the module configurations according to numerical simulations.

关键词： Thermoelectric Power Generation Stack-Type Module Flexible Section Biphasic Medium Phase Change Multi-Phase Flow Heat Transfer Enhancement Module Stabilization

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Piezoelectric Power Harvesting via Acoustic-Pressure Driven by Low-Speed Wind-Force with Resonating-Tube and Wind-Collector

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Journal of Power and Energy Engineering 2018年第11期6卷 53-64页

作者： Seiichi Deguchi Hiroya Taguchi hajime arimura Noriyuki Kobayashi Norifumi Isu Kentaro Takagi Tsuyoshi Inoue Takashi Nozoe Seigo Saito Takahiko Sano Department of Chemical Process Engineering Nagoya University Nagoya Japan Analysis & Assessment Center LIXIL Corporation Noda Japan Department of Mechanical Systems Engineering Nagoya University Nagoya Japan Fuji Ceramics Corporation Fujinomiya Japan

Wind-driven power harvestings attract attentions since their target wind speeds are quite low less than the so-called cut-in wind speed, which is generally recognized as around 3 m/s. The extant power harvestings driven by wind-induced-air-column-resonations (i.e. acoustic-pressures) are still lacking simplicity, scale flexibility and solid strategies for practical applications. Therefore, the piezoelectric power harvesters via acoustic-pressures driven by low-speedwind-forces with resonating-tubes and wind-collectors were invented so as to complement all the lacks. The wind-collector as well as the resonating-tube contributed to upraise the power harvesting density. The champion power harvesting density of 19.5 nW/dm2 could be procured at 2.3 m/s of an artificial wind and the optimal resonating-tube and wind-collector. Power harvesting proofs from the natural wind with low mean speeds down to about 0.6 m/s were successfully obtained. The cut-in wind speed of the prototype piezoelectric power harvester was found to be quite low as about 0.4 m/s, signifying its ubiquity. Finally, a multi-bundle pendant-type piezoelectric power harvester was specifically presented together with professing the solid and multiple strategies for practical applications.

关键词： Piezoelectric Power Generation Low Wind Speed Resonating Tube Wind Collector Power Harvesting Practical Demonstration

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Piezoelectric Power Harvesting Process via Phase Changes of Low-Boiling-Point Medium Together with Water for Recovering Low-Temperature Heats

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Journal of Power and Energy Engineering 2018年第11期6卷 65-77页

作者： Seiichi Deguchi Akinori Miyajima hajime arimura Haruna Banno Noriyuki Kobayashi Norifumi Isu Kentaro Takagi Tsuyoshi Inoue Takashi Nozoe Seigo Saito Takahiko Sano Department of Chemical Process Engineering Nagoya University Nagoya Japan Analysis & Assessment Center LIXIL Corporation Noda Japan Department of Mechanical Systems Engineering Nagoya University Nagoya Japan Fuji Ceramics Corporation Fujinomiya Japan

Low-temperature thermal energy conversions down to exergy zero to electric power must contribute energy sustainability. That is to say, reinforcements of power harvesting technologies from extremely low temperatures less than 373 K might be at least one of minimum roles for the current generations. Then, piezoelectric power harvesting process for recovering low-temperature heats was invented by using a unique biphasic operating medium of an underlying water-insoluble/low-boiling-point medium (i.e. NOVEC manufactured by 3M Japan Ltd.) in small quantity and upper-layered water in large quantity. The higher piezoelectric power harvesting densities were naturally revealed with an increase in heating temperatures. Excessive cooling of the operating medium deteriorated the power harvesting efficiency. The denser operating medium was surpassingly helpful to the higher piezoelectric power harvesting density. Concretely, only about 5% density increase of main operating medium (i.e. water with dissolving alum at 0.10 mol/dm3) came to the champion piezoelectric power harvesting density of 92.6 pW/dm2 in this study, which was about 1.4 times compared to that with the original biphasic medium of pure water together with a small quantity of NOVEC.

关键词： Piezoelectric Power Generation Low-Temperature Heat Recovery Biphasic Medium Phase Change Multiphase Flow Power Harvesting

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Local recurrence is an important prognostic factor of hepatocellular carcinoma

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World Journal of Gastroenterology 2005年第36期11卷 5601-5606页

作者： Eiichirou arimura Kazuhiro Kotoh Makoto Nakamuta Shusuke Morizono Munechika Enjoji hajime Nawata Department of Medicine and Bioregulatory Science Graduate School of Medical Sciences Kyushu University Fukuoka 812-8582 Japan

AIM: To clarify the importance of complete treatment by ***: A total of 140 previously untreated cases of HCC were enrolled in this study from 1988 to 2002. The inclusion criteria were: a solitary tumor less than 4 cm in diameter or multiple tumors, fewer than four in number and less than 3 cm in diameter, without extrahepatic metastasis or vessel invasion. As general principles for the treatment of HCC, the patients underwent transcatheter arterial chemoembolization (TACE) prior to PEIT. After the initial treatment of the patients,ultrasonography and computed tomography were performed, and measurement of serum levels of α-fetoprotein (AFP) was determined. When tumor recurrences were detected, PEIT and/or TACE were repeated whenever the hepatic functional reserve of the patient permitted. We then analyzed the variables that could influence prognosis, including tumor size and number, the serum levels of AFP, the parameters of hepatic function (albumin, bilirubin, ALT, hepaplastin test,platelet number, and indocyanine green retention at 15min [ICG-R15]), combined therapy with TACE, distant recurrence, and local ***: Univariate analysis identified the ICG test,serum levels of AFP and albumin, tumor size and number,and local recurrence, but not distant recurrence, as significant prognostic variables. In multivariate analysis using those five parameters, the ICG test, tumor size, tumor number,and local recurrence were identified as significant prognostic factors. In both univariate and multivariate analyses, the relative risk for the ICG test was the highest, followed by local ***: We found that local recurrence is an independent prognostic factor of HCC, indicating that achieving complete treatment for HCC on first treatment is important for improving the prognosis of patients with HCC.

关键词：肝细胞癌血液循环临床表现超声检查

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