Advanced Materials Research Vols. 457-458

Abstract: Al2O3-TiN-TiC ceramic materials with different MgO content were fabricated by hot-pressing technique. The MgO volume percent was varied from 0vol% to 5vol%. Three point bending test was applied to get the flexural strength and the Vickers indentation was applied to get the Vickers hardness and the fracture toughness. The phase composition of the ceramics was analyzed by XRD. The effects of the content of MgO on the mechanical properties and the phase composition of Al2O3-TiN-TiC were investigated. The results shows that the addition of MgO can change the phase composition of the sintered ceramic materials which displayed with diverse solid solutions and intermetallic compounds. The convertion of the mechanical properties can also be explained by the XRD results.

Abstract: A powder metallurgy technique combined with in-situ synthesis technique was applied to produce (Ti,W)C particulates reinforced iron matrix composite. The sintered composites were characterized by X-ray diffraction and scanning electron microscopy. (Ti,W)C and α-Fe were detected by X-ray diffraction analysis. The scanning electron micrographs revealed the morphology and distribution of the reinforcements. The results show that the rectangular (Ti,W)C carbides are distributed uniformly in the composite. The (Ti,W)C/Fe matrix interface is found to be free from cracks and deleterious phases. The reasons for the formation of coarse (Ti,W)C particles were also discussed .

Abstract: Composites made of phenolic resin filled with graphite platelets and copper particles (copper powder, copper fiber or both mixture), are fabricated by mechanical mixing, followed by compression molding. SEM micrograph indicates that the fillers are homogenously dispersed in composite. The electrical conductivity of composite composed of 30 wt% resin, 50 wt% graphite and 20 wt% copper particle (10/10 wt/wt copper powder/copper fiber) is up to 65S/cm. The efficiency of copper fiber is compared with copper powder. The results show that copper fiber is more effective than copper powder in improving electrical conductivity for copper homogenously dispersed composite. The particle shape is also a principal factor in influencing hardness. In this study, the hardness of composites tends to increase with decreasing the ratio of copper fiber/copper powder.

Abstract: In order to reduce the environmental pollution caused by waste fermented liquid of butanol and recyle the high protein in it, inorganic polymer coagulants were used in pretreatment of this wastewater. It was demonstrated that poly aluminium chloride (PAC) was the best flocculant and the optimal conditions were as follows: pH neutral or alkalescent, temperature 40°C, flocculant dosage 1000 mg•L^-1. After flocculation, the supernatant’s turbidity and COD could be reduced below 20 NTU and 10000 mg•L^-1 respectively.

Abstract: Three typical intelligent evolutionary algorithms are applied on Job Shop scheduling problem which are Quantum algorithm, Genetic Algorithm and Population Based Incremental Learning algorithm. They three algorithms have some common features in computation, encoding strategy and probability application, but with the different problems and different scale sizes of the same problem they show different performance. In this paper we take JSP as example to test their performance difference and analyze their applicability. Two benchmark Job Shop problems are used to fulfill the comparison. The results denote that Quantum algorithm is good in a great quantity of solution individual, GA is excellent in stability and PBIL had good performance in accuracy. The research also makes a reliable instruction on the application or combination of the three algorithms.

Abstract: Lithium-titanium oxide(Li_2.5Ti_1.375O₄) was prepared by a solid state reaction crystallization method. The results showed that the Li⁺ extraction/insertion be progressed mainly by an ion-exchange mechanism. The acid treated samples had an ion exchange capacity of 8.1mmol/g for Li⁺.

Abstract: Deformation of subgrade caused by variation of groundwater level is a problem of hydromechanical coupling. The coupling mechanism of seepage and deformation of subgrade was analyzed, and a model of hydromechanical coupling was then established. The resilient modulus of the model is related to the water content and compactness of subgrade soil. The relationship between them was obtained based on laboratory tests, and was employed to research the influence of rise of groundwater level on resilient modulus and deformation of subgrade. The results showed that the rise of water level had great influence on resilient modulus of subgrade, and the deformation of subgrade can’t be neglected.

Abstract: New complex inorganic ion exchanger Li₂TiO₃ was synthesized. The ion exchange behavior of Li₂TiO₃ has been studied in detail. Results of column test indicated, that the exchange capacity obtained from tests for Li⁺ in 0.1mol /L HNO₃ solution is 10.1mmol/g.

Abstract: Cloud computing is a general concept in which services do not depend on the end users' physical locations or configuration of their systems that deliver the services. The purpose of cloud computing is to merge several low cost computing units to one higher level system with strong computing ability. Cloud computing for mobile devices is a very appealing and potentially lucrative trend. This paper will consider privacy and other concerns related to cloud computing. These issues could cause a barrier to widespread use of mobile cloud computing and methods for resolving these issues could accelerate its adoption.