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Now showing items 1 - 16 of 117

  • POWER GENERATION SYSTEM

    A power generation system 1 is provided with: a heat source 2 of which the temperature increases/decreases with time; a first device 3 of which the temperature increases and decreases with time because of the temperature change of the heat source 2 and that is electrically polarized; a second device 4 that forms a circuit configured to extract power from the first device 3; a voltage application device 9 that applies a voltage to the first device 3; a voltage sensor 35 that monitors the power generation performance of the first device 3; a temperature prediction program P that predicts the highest reached temperature and the temperature change of the heat source 2 and/or the first device 3; and a control unit 10 that operates or stops the voltage application device 9 on the basis of the temperature predicted by the temperature prediction program P and the power generation performance of the first device 3 monitored by the voltage sensor 35. The power generation system thus configured can efficiently generate power by preventing reduction in the power generation performance of the first device.
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  • PLASMA REACTOR POWER SUPPLY DEVICE

    Provided is a plasma reactor power supply device wherein a loss due to a current flowing in a parasitic diode of a switching element can be reduced. A snubber circuit 34 (capacitor 51) is provided in parallel to a switching element 42. A voltage detection circuit 35 is configured from a series circuit wherein one end of a resistor 62 is connected to the cathode of a zener diode 61. The voltage detection circuit 35 is connected in parallel to the snubber circuit 34. A contact point 63 between the zener diode 61 and the resistor 62 is connected to the positive input terminal of a comparator 36 via a resistor 71. A predetermined negative voltage is inputted to the negative input terminal of the comparator 36. After the switching element 42 is turned on from being turned off, then turned off, when a voltage inputted to the positive input terminal of the comparator 36 is equal to or lower than the negative voltage inputted to the negative input terminal, a current flows to the output terminal of the comparator 36, and the switching element 42 is turned on.
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  • POWER GENERATION CIRCUIT AND POWER GENERATION SYSTEM

    [Problem] To provide a power generation circuit wherein power supply from the outside is not needed, and power is efficiently extracted from a power generation element, and to provide a power generation system. [Solution] A power generation circuit 1 is provided with a power generation element 9, power receiving capacitor 10, first capacitor 11, second capacitor 12, third capacitor 13, conductive wire 6, and switch system 7. Furthermore, the conductive wire 6 constitutes: the first circuit A to which the power generation element 9, the first capacitor 11, and the third capacitor are connected; a second circuit B to which the power generation element 9 and the second capacitor 12 are connected; a third circuit C to which the power generation element 9, the power receiving capacitor 10, the first capacitor 11, and the third capacitor 13 are connected; a fourth circuit D to which the power generation element 9, the power receiving capacitor 10, and the second capacitor 12 are connected; and a fifth circuit E to which the power generation element 9 and the third capacitor 13 are connected. The switch system 7 is capable of performing state switching of the conductive wire 6 between an opened state and a closed state.
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  • PLASMA GENERATING ELECTRODE, ELECTRODE PANEL, AND PLASMA REACTOR

    [Problem] To provide a plasma generating electrode, an electrode panel and a plasma reactor with which it is possible to restrict the deposition of particulate matter (PM) on the surface of a dielectric. [Solution] An electrode 23 is formed in the shape of a lattice having wire-shaped portions 31 and 32 which extend in the longitudinal direction and the lateral direction respectively. The electrode 23 has multiple rectangular mesh openings 33 each of which is enclosed by two longitudinal wire-shaped portions 31 and two lateral wire-shaped portions 32. The mesh openings 33 are smallest (finest) in a first part 34 on the most upstream side in the direction of flow of exhaust gas, and become larger (coarser) in stages toward the downstream side in the direction of flow of the exhaust gas. In other words, the density of the lattice formed by the longitudinal wire-shaped portions 31 and the lateral wire-shaped portions 32 of the electrode 23 is greatest in the first part 34 on the most upstream side in the direction of flow of the exhaust gas, and decreases in stages toward the downstream side in the direction of flow of the exhaust gas.
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  • ELECTRIC POWER GENERATION SYSTEM

    The purpose of the present invention is to provide an electric power generation system that can be prevented from being damaged by suppressing creeping discharge. The electric power generation system 1 is equipped with: a heat source 2 the temperature of which increases/decreases with time; a first device 3 which is electrically polarized as the temperature of which increases/decreases with time due to the change in the temperature of the heat source 2; a second device 4 for taking out electric power from the first device 3; a temperature sensor 8 for detecting the temperature of the first device 3; and a voltage application device 9 for applying a voltage to the first device 3. In addition, the second device 4 is equipped with a first electrode 4a and a second electrode 4b having different polarities from each other, and the first electrode 4a and the second electrode 4b are embedded in the first device 3 so as to face each other.
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  • POWER GENERATION SYSTEM AND POWER GENERATION CIRCUIT

    A power generation system (1) is provided with: a heat source (2), the temperature of which fluctuating with the passage of time; an electrically polarized first device (3), the temperature of which fluctuating with the passage of time according to the change in temperature of the heat source (2); a second device (4) for forming a circuit that is configured to extract electric power from the first device (3); a temperature sensor (8) for detecting the temperature of the first device (3); a voltage application device (9) configured to apply a positive or a negative voltage to the first device (3); and a control unit (10) for controlling the voltage application device in accordance with the temperature of the first device (3) as detected by the temperature sensor (8). The control unit (10) controls the voltage application device (9) so that a positive voltage is applied to the first device (3) when the first device (3) is in a temperature-rising state, and a negative voltage is applied to the first device (3) when the first device (3) is in a temperature-falling state.
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  • OXYGEN REDUCTION CATALYST, AND FUEL CELL

    Provided are an oxygen reduction catalyst that can activate an oxygen reduction reaction, and a fuel cell provided with an oxygen side electrode containing said oxygen reduction catalyst. The oxygen reduction catalyst, which is contained in the oxygen side electrode of a fuel cell, includes a sintered body obtained by firing a complex mixture containing: a phenanthroline Fe complex in which a phenanthroline ligand is coordinated to iron; and at least one selected from a phenanthroline Mn complex in which a phenanthroline ligand is coordinated to manganese, and a phenanthroline Ni complex in which a phenanthroline ligand is coordinated to nickel.
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  • POWER GENERATION SYSTEM

    A disclosed power generation system has a heat source having a temperature that rises and falls with the passage of time, a flow path through which a heating medium that is heated by the heat source flows, a power generation device having a power generation element that undergoes dielectric polarization as a result of the rise and fall of the temperature thereof caused by the temperature variation of the heating medium and comprises a dielectric that has a Curie temperature and a first electrode for extracting power from the power generation element, a temperature detection device that is disposed upstream from the power generation device in the flow path and detects the temperature of the heating medium that flows through the flow path, a voltage application device for applying voltage to the power generation element, and a control means for operating the voltage application device when a rise in the temperature of the heating medium is detected by the temperature detection device and stopping the voltage application device when a drop in the temperature of the heating medium is detected by the temperature detection device. The temperature detection device has a temperature detection element that undergoes dielectric polarization as a result of the rise and fall with the passage of time of the temperature thereof caused by the temperature variation of the heating medium and comprises a dielectric that has a Curie temperature that is equal to or greater than a temperature that is 50°C lower than the Curie temperature of the power generation element and a second electrode for detecting electromotive force from the temperature detection element.
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  • POWER GENERATION SYSTEM

    A power generation system (1) comprises: a heat source (2) having a temperature that rises and falls with time; a first device (3) having a temperature that rises and falls with time due to the temperature change of the heat source (2) and being electrically polarized; a second device (4) for drawing power from the first device (3); a temperature sensor (8) for detecting the temperature of the first device (3); a voltage applying device (9) for applying voltage to the first device (3); and a control unit (10) for, when the temperature rise of the first device (3) is detected by the temperature sensor (8), intermittently activating the voltage applying device (9) and for, when the temperature fall of the first device (3) is detected, continuously stopping the voltage applying device (9). With this configuration, the power generation system is obtained that can generate power with an excellent efficiency by a simple method.
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  • PLASMA REACTOR APPLIED VOLTAGE CONTROL DEVICE AND PLASMA REACTOR CONTROL DEVICE

    [Problem] To provide an applied voltage control device and the like which are capable of controlling, with a high degree of precision, the applied voltage applied between electrodes of a plasma reactor. [Solution] The current output from a pulse generating power source 5 is detected by a current sensor 42, and the values of the detected current are integrated by a current integrating circuit 43. There is a correlation between integrated current value obtained from the integration and the applied voltage value applied between electrodes 23 of a plasma reactor 4, and that relationship is stored in an applied voltage value estimation unit 44. When an integrated current value is obtained, an applied voltage value corresponding to the integrated current value is estimated on the basis of the relationship stored in the applied voltage value estimation unit 44. A power source 31 is then controlled on the basis of the estimated applied voltage value.
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  • Pyroelectric power generation with ferroelectrics (1-x)PMN-xPT

    Kim, Juyoung   Yamanaka, Satoru   Nakajima, Akira   Katou, Takanori   Kim, Yoonho   Fukuda, Tatsuo   Yoshii, Kenji   Nishihata, Yasuo   Baba, Masaaki   Takeda, Masatoshi   Yamada, Noboru   Nakayama, Tadachika   Niihara, Koichi   Tanaka, Hirohisa  

    A novel electrothermodynamic cycle based on temporal temperature variations (dT/dt); the pyroelectric effect was investigated for its potential role in the use of waste heat as renewable energy. Here, we present improved generating performance with relaxer ferroelectric ceramics ((1-x)Pb(Mg2/3Nb1/3)O-3-xPbTiO(3) (PMN-xPT)), which are well known for their strong dielectric and pyroelectric properties near the morphotropic phase boundary. The theoretical potential was evaluated using hysteresis loops, and the generating properties were analyzed in the laboratory using an engine dynamometer. The experiments yielded a value of 0.48mW/cm(3), which is 3times larger than that obtained previously, because of the high polarization properties.
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  • EXHAUST GAS PURIFYING CATALYST

    To provide an exhaust gas purifying catalyst which is capable of exhibiting more excellent gas purification performance, while reducing the amount of a noble metal used therein. An exhaust gas purifying catalyst wherein: a heat-resistant oxide is loaded with palladium and copper and/or an alloy of palladium and copper; the copper content is set larger than the palladium content; and the ratio of the palladium content is set to 0.2% by mass or less relative to the total amount of the heat-resistant oxide, palladium and copper. This exhaust gas purifying catalyst is able to decrease the cost by reducing the amount of a noble metal used therein, while efficiently purifying an exhaust gas, in particular, efficiently removing CO and NOx.
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  • ELECTRICITY-GENERATING SYSTEM

    An electricity-generating system (1) is provided with: a heat source (2) having a temperature that rises and falls over time; a first device (3) having a temperature that rises and falls over time due to the temperature variation of the heat source (2), the first device (3) conducting electric polarization; a second device (4) for drawing electric power from the first device (3); a temperature sensor (8) for detecting the temperature of the first device (3); a voltage-applying device(9) for applying a voltage to the first device (3); and a control unit (10) for actuating the voltage-applying device (9) when a rise in the temperature of the first device (3) is detected by the temperature sensor (8), and stopping the voltage-applying device (9) when a fall in the temperature of the first device (3) is detected by the temperature sensor (8).
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  • Pyroelectric power generation from the waste heat of automotive exhaust gas

    Kim, Juyoung   Yamanaka, Satoru   Murayama, Ichiro   Katou, Takanori   Sakamoto, Tomokazu   Kawasaki, Takuro   Fukuda, Tatsuo   Sekino, Tohru   Nakayama, Tadachika   Takeda, Masatoshi   Baba, Masaaki   Tanaka, Hirohisa   Aizawa, Kazuya   Hashimoto, Hideki   Kim, Yoonho  

    Waste heat is a potentially exploitable energy source but remains a problem awaiting a solution. To explore solutions for automobile applications, we investigate pyroelectric power generation from the temperature variation of exhaust gas using a novel electro-thermodynamic cycle. Niobium-doped lead zirconate titanate stannate (PNZST) ceramics were applied as pyroelectric materials, and their structural characteristics were investigated. In the driving cycle assessments (JC-08) using real exhaust gas, the maximum power generated was identified as 143.9 mW cm(-3) (777.3 J L-1 per 1 cycle) over a temperature range of 150-220 degrees C and an electric field of 13 kV cm(-1). The net mean generating power of the total driving cycle was 40.8 mW cm(-3), which is the most enhanced result in our power generating systems to date and 314 times greater than our first report. Materials with sharp transition behaviors with the temperature and electric field are worthy of study with regard to pyroelectric energy harvesting materials, and their corresponding crystal and domain structures were investigated to optimize performance.
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  • POWER GENERATION MATERIAL, POWER GENERATION ELEMENT AND POWER GENERATION SYSTEM

    A power generation element is obtained from a power generation material represented by general formula (1). In addition, a power generation system is obtained using the power generation element. (AxB1-x)NbO3 (1) (In the formula, A and B are different from each other and each represents at least one element selected from among rare earth elements, alkaline earth metals, alkali metals, Cd and Bi; and x represents an atomic ratio within the numerical range of 0 < x ≤ 1.) Due to this configuration, there can be achieved a power generation material which is able to exhibit sufficient power generation performance even in a high temperature range, a power generation element which is obtained from this power generation material, and a power generation system which is obtained using this power generation element.
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  • POWER GENERATION SYSTEM

    A power generation system is equipped with: a heat source, the temperature of which increases and decreases over time; a first device which is electrically polarized by using the changes in the temperature of the heat source to increase and decrease the temperature of the first device over time so that at least a part thereof is within the temperature range from 20°C below the Curie point thereof to 10°C above the Curie point thereof; and a second device for extracting power from the first device.
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