Advanced Materials Research Vols. 328-330

Abstract: In the developing process of an applicative system or a professional knowledge system, first we collect the required information by investigation, next study fully all kinds of rules, information, methods, programs and tasks, then abstract a general logic pattern so as to develop a matching applicative system or a professional knowledge system, finally perfect and optimize the system by means of relevant assessment criterion and methods. The system developed as above can efficiently imitate, reflect and realize the real work process. As for improving the efficiency of system and its development, improvement and creation of the theory and method of gaining and analyzing the required information in its developing process, the formation of the system’s general logic model, the system’s actual development and the design, assessment and perfection of the system are needed. Combined with practice, this article has showed some related creative research in every step in the base of the developing theory.

Abstract: Based on the requirements of torque transmission for stability and saturation magnetization of magnetorheological fluid (MRF), an orthogonal test was designed to arrange for the preparation of MRF. MRF was prepared by chemical co-precipitation method, in which Fe₃O₄ nano-particles were coated with polyethylene glycol(PEG-4000). The size and distribution of particles were observed by transmission electron microscope (TEM). The saturation magnetization was measured by vibrating sample magnetometer(VSM). Through analysis of variance of orthogonal test,an optimal method for preparing a highly stable and saturation magnetization MRF was summarized. Four main parameters in preparation of MRF were discussed, including the rate of amount of substance between Fe²⁺and Fe³⁺, the rate of amount of substance between PEG-4000 and Fe²⁺, reaction time and the reaction temperature. It has important practical significance on the study of magnetorheological transmission device.

Abstract: Risk is a concept that denotes the probability of the occurrence of dangers. The factors that generate fires and dangers are numerous, and always emerge in unapparent places. Once these factors are identified, a fire accident would happen and lead to great loss. For the fires happening in tall buildings that caused immense loss, the function of planned fire separation system was destroyed because the users had weak fire prevention concepts. One of the typical examples is the fire that happened and spread over Don-ke Building in Sijhih City, Taipei County, Taiwan. Based on the damage prevention concepts of property insurance agents, the study focused on the importance of the fire prevention management in tall buildings. The other part that was paid attention to is the Fire Safety Building strongly encouraged and propelled by the Architecture and Building Research Institute of Ministry of the Interior, with which the study conducted an investigation on fire risk management.

Abstract: The feasibility and superiority of the remote fault diagnosis system based on B/S structure is analyzed in this paper. The B/S structure is introduced and compared with C/S structure briefly. The paper summarize frame and main function module of the remote fault diagnosis system and introduce its key technology, such as data acquisition technology, data transmission technology between server and client, intelligent diagnosis technology, database technology etc. The hybrid model of support vector machine (SVM) and hidden markov models(HMM) is used as a intelligent diagnosis method of the system, and a new design which could improve the integrity and privacy of the system database data is applied. According to the diagnostic results to all kinds of simulated faults in the Bently vibration test bed, it shows the system is not only stable, reliable and high accuracy, but also has a certain application value to engineering.

Abstract: The amplitude frequency response characteristics of simple beams made by Fe-Mn damping alloy, Fe-Cr-Mo damping alloy and 0.45C-steel under forced vibrations were studied using forced vibration measurement instrument. The results indicated that at forced vibration condition, the damping behaviors of Fe-Mn and Fe-Cr-Mo alloy beams were that the resonance amplitude and the resonance frequency range were reduced. The higher the exciting force was, the better the damping capacity of Fe-Mn alloy beam was, so it was suitable for the environment where higher vibrating force and shock existed. Whatever the exciting force was high or low, the damping capacity of Fe-Cr-Mo alloy beam was higher than 0.45C-steel, so it was more suitable for the environment where the strain amplitude changed in a wide range.

Abstract: Low-temperature impact test on four different kinds of weld metal welded by different technologies of high-current MAG welding was carried out in this paper. The results show that different materials and different welding parameters have different effect on impact energy. As the chemical analysis and observation from the optical microscope show that When welding material contains appropriate C, Si, Ti, fine acicular ferrite forms in it; on the contrary, crisp and thick bainite appears. Compares to acicular ferrite which has an Akv>27J at -27°C and better toughness, bainite has a poor toughness and an Akv<27J. The internal friction experiments show that there are two internal friction peaks - Snoek and SKK. The peak is clear when the microstructure is bainite, on the other side, the microstructure is acicular ferrite.

Abstract: The paper presents the study by changing of Oxidizability –Reducibility of mixed batch glass material and changing the quantities of Coloring agent, Cu, in glass melting. The analysis of Spectrum Transmittance and Chroma Index have been carried out on the different sample plates obtained in the glass melting. The test results indicate: The wavelength T≥52.73% shown by the transmittance of light for the glass in the following conditions: a) When the value of COD of mixed batch glass material was equal to 473.06( i.e. the quantity amount of CuO in percentage is 0.3%) . b) When a= 0.596 and b=6.560 was shown in the Chroma Index of glass. The wavelength T = 10.33% at lowest shown by the transmittance of light for the glass in the following conditions: a) When the value of COD of mixed batch glass material was equal to 160.23( i.e. the quantity amount of CuO in percentage is 0.3% as well) b) When a= - 18.039 and b= - 9.178 was shown in the Chroma Index of glass.

Abstract: In this paper, a novel composite material of Acrylonitrile-Butadlene-Styrene resin (ABS)-based fabric coated with Cu/Ni-P was prepared via chemical redox plating technique. A series of such composite materials with varying thickness of Cu and Ni-P showed remarkable electromagnetic shielding ability. With the increase of Cu thickness, the shielding effect (SE) was increased gradually, but leveled off after 1.5μm at a SE of about 70dB. Similarly, with the increase of the depth of Ni-P coats, the SE increased gradually, and leveled off after 1.0μm at a SE of about 45dB. The optimum ABS/Cu/Ni-P was Cu 1.5μm and Ni-P 1.0μm unilaterally. The ABS/Cu/Ni-P composite material possessed excellent shielding ability in the range of 0.001-1000MHz at a stable SE of >80dB, and it also possessed ideal shielding effect in the range of >36GHz. But in the range of 10-18GHz, the shielding effect is slightly decreased gradually to about 60dB. So the ABS/Cu/Ni-P fabric composite is an ideal candidate for electromagnetic shielding material at low and high frequency radiations.

Abstract: The degradation of neoprene often occurs as a slow and gradual process and it is cannot be used abruptly. In order to keep the safety of equipments and people, it is important to consider the development of such process to correctly estimate its service life. The heat seawater method was designed and the accelerated aging tests of the neoprene were carried in laboratory. The tearing strength of the neoprene in aging time was investigated. The rule of tearing strength and aging time was studied. The service life prediction function of the neoprene was established and service life at 25°C was estimated based on the index of tearing strength. The result shows that tearing strength of the neoprene decreases in exponential form with aging time, and the service life of the neoprene used in sea water at 25°C is 29.79 years.

Abstract: This paper presents the effect of the non-axisymmetric magnetic and steady state thermal load on thermo magneto mechanic functionally graded (FG) hollow cylinder. An analytical solution for stresses and Lorentz force were determined using the separation of variables and complex Fourier series and the power law functions for material, except Poisson’s ratio, through the thickness of the cylinder. The results show that the magnetic field has a significant effect on stresses and displacements along the cylinder and with the specific magnetic field vector the stresses and displacements along the cylinder can be controlled and optimized. The aim of this work was to understand the effect of Lorentz force on a functionally graded hollow cylinder subjected to mechanical, thermal and magnetic load. The magnetic field decrease circumferential displacements and stress and increase the radial displacements and stress due to thermo mechanical loads.