Advanced Materials Research Vol. 499

Abstract: As traditional measuring method based on dielectric coefficients shows cross-sensitivity for multi-factor in the measurement of oil/water mixture, it can not meet the requirements of digital oilfield construction. Therefore, this paper presents an inverse model of wavelet neural network (WNN) combining with multi-sensing technology for achieving high-accuracy measurement of water content in crude oil. The simulation and experimental results demonstrate that the proposed method is available to eliminate the cross-coupling effects of multi-factors. The method has higher measurement accuracy and stronger generalization than the model built by BP-NN, and opens a versatile approach in nonlinear error calibration for multi-factors measuring system.

Abstract: This paper presents a numerical approach for modeling multiple crack fatigue growth in a plane elastic infinite plate. It involves a generation of Bueckner’s principle, In the numerical simulation, for each increment of crack extension, remeshing of existing boundaries is not necessary. Crack extension is modeled conveniently by adding new boundary elements on the incremental crack extension to the previous crack boundaries. At the same time, the element characters of some related elements are adjusted according to the manner in which the boundary element method is implemented. Fatigue growth of an inclined crack in a infinite plate under cyclic load is modeled to illustrate the effectiveness of the numerical approach.

Abstract: Through capability comparison activity on fuel laboratories of 30 thermal power plants, evaluate the capability of ash content in coal conducted in each laboratory by │Z│value, possible uncertain factors that may occur in the determination process of the project has been assessed fully, and technical measures to control quality detection level in fuel laboratory have been proposed.

Abstract: This paper focuses on the influence of processing methods on the cracks’ number and form of bionic units on the vermicular cast iron. The results show that there have already been cracks on the bionic units’ surface, and the crack number increases with the thermal cycles. The crack’s form on bionic units processed in air is tree-like structure, and that of bionic units processed in water is network structure. The twice laser process and the electro-pulsing treatment can effectively reduce the crack number of the bionic units processed in water, without changing the form.

Abstract: Soot remains different locations from fire source have the same characteristics of fire remains different combustion time. This study discusses the soot formation process from the time theory view and soot disposition rule from the space theory view. By GC/MS, through the analysis of the histograms of every composition percentages of smoke remain different height and the molecular structure of the primary ingredient of smoke remain, the characteristics information of different combustion stages retained in soot different height can perfomance the process of soot formation, Which may be used to analyze of the primary ingredients generated by smoldering fire and may help the fire investigation in smoldering fire.

Abstract: This paper is concerned with the projective synchronization problem for a class of chaotic system with uncertainties. By utilizing single Lyapunov function method, an adaptive switching control scheme for the synchronization has been presented. Simulation examples, the chaotic Liu system are given to show the feasibility and effectiveness of the proposed theory and method.

Abstract: This paper introduces several applications of machine vision technology. With paneled CCD as the image sensor, the two-dimensional pictures of sample under study are inputted to a computer via the image grabbing card. After the preprocessing to the original image, image segmentation and feature extraction are carried on the target image, and the parameter value is figured out. The method is suitable for the parameter detection of the size, surface defect and color information, and have vast of application foreground.

Abstract: The machanisms of suspended load abrasion and bed load abrasion are different, but they are not distinguished in the current test methods to evaluate the abrasion resistance of concrete. The abrasion resistance to bed load can be tested by underwater method, and to bed load can be tested by ring speciman method. To study the influence of mixture parameters of concrete to these two machanisms, concretes with different aggregates, different dosage of fly ash and different strength grade were tested by high speed underwater method and high speed ring speciman method. The results showed that the amount of cementing materials and the types of fine aggregate had a significant effect on the high-speed ring specimen method, but it wasn’t affected by the class of strength, so this method only reflected the abrasion resistance of the outer concrete and was easily influenced by the quality of concrete surface; high-speed underwater method was just only related to the types of aggregate, and had little effect on the rest, so it could reflect the abrasion resistance of the inner concrete without caring about the quality of concrete surface. Therefore, choosing different test methods for evaluating the abrasion resistance of concrete should be based on the actual condition in the projects.

Abstract: A contrast test was done about the service performance of commercial emulsion II and water miscible rolling lubricant J4 with polyethylene glycol. The test results were given to have analysed them in lubrication, extreme pressure performance, simulating annealing, resistance of putrefy, rust protection etc. From the rolling mill in the lab, at the same depress ratio, the pressure reduce 3.85kN using J4 than using II, and the rolling power reduce 0.04kW using J4 than using II. By four-ball tester, the maximum load PB of J4 is 932N, the friction is 0.0518, and the wear diameter is 0.47mm. Water miscible rolling lubricant J4 is notable in lubrication, extreme pressure performance, annealing, resistance of putrefy and rust protection. The results may offer the reference for further optimization on water miscible rolling lubricant.

Abstract: The four main effect production factors, doping rate, calcination temperature, soaking time and heating rate, are chose to design experiments based on the orthogonal table L₉(₃⁴) to prepare urea-modified titanium ore (UTO) sorbents. And the decoloration efficiency of methyl orange is examined by using UTO as sorbents under dark-state absorption. Based on the orthogonal experiments, we obtained the optimal operating parameters: urea 8.0wt%, soaking time 3h, calcination temperature 300°C and heating rate 10°C/min. As the preparation condition was run at the optimal conditions, the decoloration efficiency of methyl orange reached 98.1%, which was significantly better than the undoped samples. Thus, it is feasible to treat dye wastewater by these UTO sorbents.