Papers by Keyword: High-Efficiency

Abstract: The purpose of this study is to describe a novel topologic technology for wireless power transmitting through external coils to multiple implantable micro-electromechanical devices inside the patient body, which is able to solve the dilemma of recharging. Wireless power transmitters are designed based on class π-type topologic structure, which improves existing Class-E power amplifier structure and impedance matching technology. Mathematical Models based on resonating chopper MOSFET and class π-type impedance matching network are introduced to optimize the design parameters. Together with proper capacitors and high-flux, low-loss inductors, an optimal wireless power transmitter with significant characteristics of high efficiency and low loss takes advantage of this brand new type of topologic structure. The author designed and developed the RF oscillator and the actual class E power resonant amplifier. During studies, with the 12V power supply, the voltage of 96.8V is generated on the 50ohm high-power RF load side, along with source current of 2.183A. The efficiency of the system reaches 89.4%, which satisfied the need for implantable micro-electromechanical device.

Abstract: To fight global warming, we must understand what our energy options are. By far the most important option is efficiency, which is the easiest, quickest, and least expensive way to fight global warming. The most efficient way to decrease the energy consumption of buildings is to increase the insulation of thermal envelopes such as the roof and exterior walls. Globally, many countries have targets to reduce building energy consumption and to provide energy efficient buildings such as passive house and zero energy buildings. This paper presents the applications of high-efficiency insulations for passive house and zero energy buildings. Insulation cost is a small percentage of the total construction cost, but the saved energy cost is large making payback periods short. Considering the possibility of rise of oil price and the exhaustion of fossil fuel, insulation should be added beyond the level that any building insulation code requires.

Abstract: This article proposed a new mode of modular build of architectural space, which is a creative approach to achieve high-efficient construction and operation. The new mode integrates each step during the process of design, construction, and operation of buildings as a whole system, implementing the purpose of creating appropriate, cost-efficient, and durable buildings. The authors established a framework of modular build of multi-storey bar-shaped buildings. The new mode aims to improve the overall efficiency in the entire architecture and civil engineering industry and realize macroscopic energy-saving to obtain enormous social benefits.

Abstract: According to requirements of fire service, turbopump is used to supply water from low-level water resources. The efficiency of agricultural irrigation turbopump is too low to provide sufficient water to fire control, so a fire turbopump is designed in this paper. It is common to design a turbopump by empirical methods, but this causes turbopump not to operate at best efficiency point. Therefore, three design concepts of new turbopump model, existing hydraulic match model and turbopump conversion model are discussed. Their theories and application conditions are also listed. After design of fire turbopump by new turbopump model, numerical simulation is conducted to analyze the pressure field to predict operating status. The open rig experiment is also presented to confirm its performance characteristics. The pump head and flow rate of the designed turbopump meets the requirements of fire ground and it is proved that the efficiency of fire turbopump is much higher than irrigation turbopump, which indicates the new turbopump model is an effective strategy to design turbopump.

Abstract: As a high-efficiency silicon solar cell concept amorphous silicon/crystalline silicon (a-Si:H(n,p)/c-Si (p,n)) hetero-junction solar cells are of great scientific interest [1, . The a-Si:H emitter is deposited by plasma-enhanced chemical vapor deposition (PECVD). The biggest challenge is to avoid recombination at the a-Si:H(i)/c-Si interface where the p-n junction is located. A clean, smooth, hydrogen terminated c-Si surface is supposed to be mandatory for a high passivation quality of the deposited layer [3, 4]. It is well established that treatment in dilute hydrofluoric acid (dHF) solution (1-10%) produces a hydrogen-terminated, clean Si surface [e.g. 5, 6, 7]. H-termination is supposed to rise with increasing etch time [8]. Whereas prolonged rinsing after the etch step leads to a formation of OH-groups at the surface [8]. Because of the high sensitivity of the a-Si:H(i)/c-Si interface the influence of prolonged etching in dHF (1%) as well as prolonged rinsing in deionized water (DI water) on the passivation quality of the deposited a-Si:H(i) layer has to be carefully studied. Also the possibility of decreased hydrophobicity and a possible iron recontamination from the HF has been taken into account.

Abstract: This paper design an identical polarization embedding high-efficiency permanent magnet synchronous motor and analysis electromagnetic field distribution of the new structure permanent magnet synchronous motor, as well as optimize the design using modern chaos optimization algorithm based on the invention patent. Carried out analysis of energy-saving effect combination high-performance interior PMSM with the aid of identical polarization embedding in textiles with small batch production type test. The optimize design and experiment show that the new structure motor efficiency and power factor higher than the previous configuration of the asynchronous motor, and with high-efficiency and energy-saving advantages in a very broad power output range at the condition of same load.

Abstract: This paper attempts to present an optimal design strategy and characteristics of high-power permanent magnet synchronous motor(PMSM). The structures of rotor lamination, calculation of Air-gap Length, how temperature influences the performance of the motor and the calculation of Xad、Xaq under the equivalent direct axis are presented.

Abstract: Simple two-step wet-chemical cleans composed of an oxidizing step with in water dissolved ozone followed by an etching step have been studied for high-efficient hetero-junction silicon solar cell applications. For this purpose flat Si (111) samples passivated with amorphous silicon have been investigated. The effect of nanoroughness of the crystalline silicon surface on the minority carrier lifetime is shown. An influence of the storage time between cleaning and a-Si:H deposition was found and can partly be attributed to changes in surface roughness and native oxide growth.

Abstract: Alkyd resin dispersions are used in the paint industry as the basis for the new generation of environmentally friendly gloss paints. This research based on two-component seed oil soybean oil and castor oil to synthesis high-efficiency modified alkyd resin. The experimental conditions are the mass ratio of soybean oil with castor oil is 2:1, 55% degree of oil, Ni(OH)2 as the catalyst and 210°C~220°C for alcohol solution reaction, 220°C for esterification under the protection of nitrogen. The experimental results show that the product non-drying days are more than 30 days, acid value is 6.6, the migration is 1.2%, adhesion is one level, flexibility is 0.5, chroma value is 8.

Abstract: The improvement of the basic performance makes white OLEDs the promising candidate of the next generation, environmental friendly lighting source. However, for the practical application, additional properties of higher color rendering index (CRI), long lifetime at high luminance, large area uniform light emission, and high reliability for long time operation are required. Furthermore, innovative fabrication processes specialized for OLED lighting are required to reduce the cost by improving the material utilization and productivity. We developed various technologies for OLED lighting in the Japanese governmental project “High-efficiency lighting based on the organic light-emitting mechanism” from 2007. In this project, high CRI, highly efficient and long lifetime white OLEDs were realized by optically designed two-unit structure with a fluorescent deep blue emissive unit and a green / red phosphorescent unit. A reliable encapsulation structure with high heat radiation and moisture-proof characteristics realized a stable emission at high luminance as well as long storage stability. Additionally, thermal diffusivities of organic thin films with sub-hundred nanometer thicknesses were analyzed by a “rear heating/front detection type” nanosecond thermo-reflectance method. High speed wet coating process and vacuum deposition process for very thin layers were developed to improve the accuracy, material utilization and productivity.