Advanced Materials Research Vols. 989-994

Abstract: This paper studies receiving power of electromagnetic wave scattering on sea surface transmitted by directional antenna. Analyzes different overlapping conditions of transmitter beaming and receiver beaming on the sea surface, deduces the calculation formulae, and calculation of the receiving power of scattering wave in case of different across angle between radiator and receiver beams on sea surface. The result shows that the across angle is a important factor of receiver to receive electromagnetic wave scattering power on sea surface, and it gives an accurately calculating method by receiver to receive electromagnetic wave scattering power from sea surface. The method can apply to the condition that radar or jammer transmitters beam to sea surface and reconnaissance or radar receiving the scattering power from sea surface at another position, etc..

Abstract: For the need of simulation research of technical support and obtain basic rush repair data of certain ground-to-air electrical equipment in battlefield condition, this paper studies on the simulation for damage of certain electrical power equipment in battlefield. It analyzes threat mechanisms and basic damage theories of power unit and compiles simulation procedure adopting Monte Carlo method. By simulation, it can analyze vulnerability and distributing of damage parts for electrical power equipment. All this provides reference for rush repair and instruct to defend in battlefield condition.

Abstract: To the gas field had been developed for a long term, the yield is hard to keep a high value. How to improve the daily production is a key problem. Fracturing again in old wells can be an effective method to solve the problem. In this paper, we introduce this technique. We choose well and layer firstly, and then decide a suitable fracturing measure. Finally, fracturing evaluation shows the method can improve the yield effectively. This experience can be popularized.

Abstract: In this paper, based on unsteady heat transfer calculation method, the results of the heat transfer through the enclosure of car compartment are given, in order to analyze dynamic energy-saving effect of the regionalism design on air-conditioning system for car. The result demonstrates that the regionalism design on the air-conditioning system has important saving-energy effect.

Abstract: The paper takes Liaobin New Town Low-carbon Ecological Plan as the research object, and explores the constructing process of Liaobin New Town Low-carbon Ecological Planning Indicator System (LCEPIS), mentions construction principles and methods; Secondly by analyzing regional condition, it assures the main paradox of regional development and the core of low-carbon ecological plan; Thirdly it mentions construction methods of the research object, sets up indicator system upon the procedure of frame assembling, indicator picking, indicator quantifying and indicator weighted value confirming; thirdly it introduces the specific calculating method as the indicator system is assessed and applied; finally we obtain the main outcome: Liaobin LCEPIS, meantime gain sub-conclusions such as initial picking library, chosen indicator and weight of indicator, etc. The research method could guide how to construct a regional plan indicator system, and obtained result could be referenced for similar plan indicator system.

Abstract: Ships have carried solid ballast for thousands of years in the form of rocks, sand or metal. In modern times, ships use water as ballast. It is more easier to load on and off a ship and more efficient and economical than solid ones. Ship fills with ballast water when it is empty of cargo, and the ballast water is discharged when it loads cargo. In ballast water ,there are hundreds of organisms carried that cause problematic ecological effects outside of their natural range. Preventing the transfer of invasive species and coordinating a timely and effective response to invasions require cooperation and collaboration between governments. Considerable efforts had already made to formulate appropriate standards for ballast water management during the convention development process. Overview

Abstract: A high-order bandgap voltage reference (BGR) is designed by adopting a current which is proportional to absolute temperature T^1.5. The high-order BGR is analyzed and simulated in SMIC 0.18μm CMOS process. Simulation results show that the designed high-order BGR achieves temperature coefficient of 2.54ppm/°C when temperature ranging from-55°C to 125°C. The high-order BGR at 10Hz, 100Hz, 1kHz, 10kHz and 100kHz achieves, respectively, the power supply rejection ratio of-64.01dB, -64.01dB, -64dB, -63.5dB and-53.2dB. When power supply voltage changes from 1.7V to 2.5V, the output voltage deviation of BGR is only 617.6μV.

Abstract: This paper designs a high-gain wide-bandwidth multistage amplifier by employing the dual-miller compensation with nulling-resistor and dual-feedforward compensation (DMCNR-DFC) in 0.35μm BCD process. The designed DMCNR-DFC multistage amplifier achieves well performance including gain-bandwidth product (GBW) and slew rate (SR). Simulation results show that the DMCNR-DFC multistage amplifier achieves a dc gain of about 121.1dB and GBW of about 6.1MHz with 52^o phase margin.

Abstract: With the continuous improvement of photovoltaic power generation technology, people has higher requirement on the performance of the photovoltaic inverter. Currently, PV Inverter Grid process of the home and abroad, because the inverter put DC power into AC power frequency electric use the inverter principle and PWM control technology inevitably produce harmonics problems at the sine wave inverter formed. According to this kind of harmonic interference problem, the adaptive in-place active harmonic compensation technology were proposed, this effectively suppress the harmonic pollution to power network, solved the PV inverter output harmonic and reactive power problems, effective purification of power grid, filled the domestic and foreign photovoltaic inverter without output current harmonic compensation gap.

Abstract: According to the problem that when power failure occurs in distribution systems, load transfer is to recover the load downstream failures without any violation as fast as possible. This target is reached by switch operations and load cut. Using the stochastic optimization method to the solution of the problem, we can improve the efficiency of solution for the operation personnel to provide the reference scheme of load transfer. Test results of a 33 bus sample network have shown that the new method for load recovery can significantly reduce the losses caused by the failures and improve system reliability.