Advanced Materials Research Vol. 740

Abstract: To implement the objective of steady operation of the marine observation buoy system on the sea throughout the year,based on energy balance between supply and demand, this paper presents the mathematical model of solar energy power supply system derived from double batteries switching technology. The batteries are divided into main batteries and auxiliary batteries. The main batteries are used regularly and the auxiliary batteries are used in periodic rainy weather. The main advantage of this model is that the capacity of auxiliary batteries can be dynamic calculated based on the numbers of maximum continuous rainy days and minimum intervals between rainy days. The batteries capacity is sufficient but not redundant. This design project has been tested on marine buoy and the accuracy of the model is splendid for most engineering projects.

Abstract: To solve the problem how to prevent the marine environment monitoring feature data from leaking when an emergency occurs, a destruction of data used in marine environment monitoring buoy system is researched. The architecture design of the system is introduced; a data overwrite algorithm based on the data secret level of the marine work is proposed; through data overwrite technology and the high-pressure circuit to achieve the safe destruction of data elements in marine environmental monitoring. The study shows the data destruction system can trigger data destruction procedures in real time, it can solve data security issues for marine environmental monitoring buoy in the out of control situation, and the destroyed data is unrecoverable, thus preventing data loss and leakage.

Abstract: A structural design scheme was proposed based on the requirements for giant generator excitation rectifier cabinet. It is described in detail from type selection, heat dissipation, to insulation and modular design. The operation in the Three Gorges Underground Power Station proved the success of the structural design.

Abstract: Northwest Russia has significant volumes of woody biomass of different origins that are available for energy, butwoodis not widely used as fuel.Four alternatives of forest chip supply systems were compared in the Republic of Kareliawith the support systemand the most favorable methods of wood chip production were determined by the local market conditions. The collection of logging residues for chipping is cost-effective if the distance to the customer is less than 100 km. The use of round energy wood for the production of forest chips compared with the use of logging residues is more economically feasible. In this case, forest chips can be transported up to 150 km. The availability of logging residues largely depends on the load-bearing capacity of the soil at harvesting sites. When considering the local market, a production method based on chipping energy wood at the end user facility has the best economic efficiency.

Abstract: Use molecular ecology technology to analyze bacteria populations in biofilm, which has a very important significance for effective sewage treatment and improvement of nitrogen and phosphorus removal rate. This article described RFLP, SSCP, FISH etc., brought together the research results at home and abroad, broadened the idea of exploring the diversity of microorganisms, the structure and distribution, as well as the dynamic in BAF.

Abstract: Currently Taiwan and Slovakia import over 90% of energy consumables annually. High energy import rates make both countries viably engaged in research on renewable resources, also green planning policy has been proposed. Population is concentrated in the major cities which are facing energy deficiency issues. The unregulated development of micro-urban areas is underestimated in both cases so are the energy issues bound with them. Centralized energy sources require long distance wires to support remote areas. The proposed urban idea consists of energy resource decentralization by detailed focus on micro-urban development through the combination of accurate hydro distribution system for direct energy production in a place of consumption as a part of the autarchic micro-urban grids arranged in efficiency electric power grid circles calculated by loses in wiring. This urban energy model binds micro-urban structures in one solid network and at the same time creates local smart energy communities built up on each individual dwelling unit that can produce energy for itself from renewable resources locally available and support the local micro-urban public grid or even support nearest city public grid. Hydro energy is so far the most common, stable and efficient renewable resource in use. Water turbines efficiency has gone up to 96%. Proposed new multi-purpose small hydro type is one of the preliminary small scale systems that could be precisely tailored to micro-urban demands. It could stand by for direct use if needed and also use various types of working mediums (e.g. compressed gas, steam, water).

Abstract: At the Taiwan Light Source (TLS), the booster ring provides energy injection at repetition frequency 10 Hz with injection capability in the top-up mode. To obtain the wide acceleration energy range 50 -- 1.5 GeV, a 'White-circuit' topology has been chosen. The White circuit is, briefly, a biased resonant circuit in which the energy is transferred between the booster bending magnets and a large capacitor bank. The White circuit uses a resonance axiom to ramp the current of the bending magnets. The peak current is 2300 A; the bending magnets can accelerate the energy of the booster electron beam current from 50 MeV to 1.5 GeV with the White circuit system. We analyze the characteristic of the White circuit to get a circuit model. Using the circuit model to simulate impedance and phase are identical with the measurement data of the White circuit. The results are described in this paper.

Abstract: We designed and implemented a power converter to provide a dc power bus for the MCOR 12 correction supply. The characteristics of the dc power bus are variable frequency at both heavy and medium or light loads. These characteristics match the working requirement of the correction supply. The dc power bus has a relaxation oscillator that generates a symmetric triangular waveform, to which MOSFET switching is locked. The frequency of this waveform is related to a voltage to be modulated with feedback circuitry. As a result, the circuit and complex transformer are driven with a half-bridge. We designed the complex resonant transformer and describe in this paper a simulation model that is highly important, thus to exploit its frequency-dependent transfer characteristics. We obtained a power bus with small ripple to provide the correction power. The high-performance characteristics of the resonant dc power bus are illustrated in this paper.

Abstract: The development of a new generation of high performance aircraft turbine jet engine desires gas turbines to be operated at very high rotor inlet gas temperatures. This brings a problem on the effective cooling of turbine blades. Up to now, modified film cooling is still an effective cooling technique. The influence of air-film hole structures on the air-film cooling efficiency cant be ignored. A survey of the research results concerning novel air-film cooling hole about home and abroad were given and high efficiency crescent air-film hole geometry was put forward. Through a comparative study of film cooling characteristic with cylindrical air-film hole and forward diffused air-film hole and crescent air-film hole found effectiveness of the crescent air-film hole was superior to other air-film holes in various blowing ratios. The crescent air-film hole could greatly reduce the kidney vortex intensity, and then enhanced the air-film cooling effectiveness.

Abstract: Film cooling effectiveness downstream and spanwise distribution of one row of converging slot-holes at the blade were investigated using a three-dimensional finite volume method and multi-block technique at the blowing ratio ranging from 0.5 to 2.0. Previous successful application of a two-layer turbulence model to cylindrical is extended to predict film cooling for the converging slot-hole geometry. Also, the influence of jet angle on film cooling effectiveness from converging slot-holes at the blade was studied. The results showed that the centerline effectiveness of converging slot-hole was going to be increased along with blowing ratio increasing. It was also shown that the uniform lateral spreading of the effectiveness with an enhancement of the intersection of the two slot-holes. It was found that cooling effectiveness for 25° was superior to other jet angle for any blowing ratios. Furthermore, the improvement realized by the small jet angle compared to the other jet angle holes was more important at the higher blowing ratio than it was at the lower one. Cooling effectiveness of 45° and 60° holes was declining along downstream of the holes, but it was improving over again at somewhere from downstream and then it was continuing decline. Cooling effectiveness of 60° holes presented a marked improvement compared to 45° holes at beyond downstream of the holes. Counter rotating vortex pairs at the exit of big jet angle holes were obvious and strong, but these vortexes have been weakened at the exit of small jet angle holes and results in a better coolant protection than that of the big jet angle holes.