Advanced Materials Research Vol. 909

Abstract: The paper introduces the operation principle and system structure of intelligence digital readout system by inductosyn. The system adopts integrated subdivision circuit on the basis of AD2S90 and QA740210 and is controlled by MCU. It adopts phase demodulation mode, with functions of multipoint preset, power-fail protect, absolute origin setting, software error compensation, LCD display and so on, except simple PLC function and standard RS485 communication interface.

Abstract: We outline the development and application of the Autonomous Fibre-Optic Rotational Seismograph (AFORS), which utilizes the Sagnac effect for a direct measurement of seismic rotation. The main advantage of AFORS is it complete insensitivity to linear motions as well as a direct measurement of rotational components emitted during seismic events. The presented system contains a special autonomous signal processing unit which optimizes its operation for the measurement of rotation motions, whereas applied telemetric system based on the Internet allows for a remote AFORS control. The laboratory investigation of the two such devices indicated they keep accuracy no less than 5.1·10^-9 to 5.5·10^-8 rad/s in the frequency bandpass from 0.83 Hz to 106.15 Hz with protect linear changes of sensitivity in above bandpass. The experimental results of AFORS-1 application for continuous monitoring the rotational events in the Książ (Poland) seismological observatory are also presented.

Abstract: This research aims to study the design and thermal insulation performance of detached houses in Taiwan through the analysis of 55 detached houses. The research shows that 85% of detached houses are built using reinforced concrete (RC) construction, and the rest mostly using lightweight steel framing (LSF) construction. The thermal insulation performance of envelope construction of RC housing is poorer than LSF housing. More than 80% of the case study sample could not meet the roof thermal insulation requirements of Taiwans latest regulations on housing building energy saving. The most commonly used thermal insulation materials are polystyrene board, glass wool and rock wool, which are nearly all applied in LSF housings for the internal thermal insulation layer or the structural body layer of envelope construction. Polystyrene board has the widest range of use, including both internal and external thermal insulation layers of the envelope construction. If improving thermal insulation performance of the common envelope construction concluded from case study samples to meet Taiwans latest regulations on housing building energy saving, of the savings on air-conditioning energy during the summer could potentially be 11.5%. However, above improvement project is not economically beneficial due to the too long payback period.

Abstract: Biowaste composting is one of the main technologies of waste management in Poland. Composting process run is influenced by many parameters which can accelerate or slow down the phenomena. However, there is no information about the influence of humidity of the air pumped to composted mass on process run. Thus, the aim of this paper is to analyze the influence of air humidity on parameters of composting process. The results have showed that there is no significant influence of the air humidity on a dynamics of composting process. Even in case when the difference in air humidity exceeded 60%, the temperature remained similar. The research proved utility of new kind of temperature sensors. Temperature analysis in the whole volume of composting chamber allows to control composting process in much more effective way.

Abstract: Using the data of cores, outcrops, thin sections and image logs, we analyzed the fracture distribution characteristics in the ultra-low permeability reservoirs of Anpeng oilfield. Then, we analyzed the main factors controlling the development of fractures. There are tectonic fractures and diagenetic fractures in the ultra-low permeability reservoirs. Tectonic fractures with high dip-angle are the main fracture type. Under the stresses resulting from horizontal tectonic compressions in the Early and Late Himalayan movements, three sets of tectonic fractures formed in the study area, i.e. E-W, NE-SW and NW-SE orientations. The E-W oriented fractures are developed better, then the NE-SW and NW-SE oriented fractures. The formation and distribution of these tectonic fractures are controlled by the tectonic stress field, lithology, porosity, permeability, layer thickness and structures. Under the same controlling factors, the origin types, occurrences and development characteristics of fractures in shallow-to mid-depth reservoirs are similar to that in the deep reservoirs. But fractures developed better in the deep reservoirs than that in the shallow-to mid-depth reservoirs.

Abstract: The study is focused on the formulation of a proposed polynomial stochastic fatigue crack growth model. Assuming the fatigue crack growth rate equal to a deterministic polynomial function in terms of fatigue crack size multiplied by a stationary lognormal random factor accounting for the statistical scatter of the fatigue crack growth, the analytical solutions of fatigue crack growth function and median crack growth function in term of model parameters were derived. Two extreme cases, lognormal random variable and lognormal white noise, of the proposed model were also investigated, and the analytical solutions of the distribution function of the random crack size at any service time and distribution function of random time to reach a specified crack size were obtained.