Abstract: Fe3O4/chitosan composite was developed as a new type of cell carrier to be used in red pigment fermentation. The presence of the Fe3O4 particles in chitosan composite not only improved the yield of red pigment, but also enhanced the biomass attached on the composite. The Fe3O4/chitosan composite was found to be more effective for immobilization of Monascus purpureus than chitosan particles. Red pigment of 2.24 UA510 was obtained using Fe3O4/chitosan composite cultures in liquid fermentation. The biomass attached on Fe3O4/chitosan composite reached to 264 mg dry wt. cells/g carrier.
Abstract: The torque transmission capacity within a range of the structure is the main factor that limit the application of the magnetic powder clutch in the vehicle transmission field. In order to increase the torque transmitting characteristics of the magnetic powder clutch, the analysis model of the magnetic powder clutch was established with finite element numerical calculation method based on the depth analysis its operating principle, which focused on the study of the influence of the magnetic property of the magnetic powder and magnetic circuit material on the magnetic powder clutch performance. The research results showed that the greater of the saturated magnetic induction and the magnetic permeability of the magnetic powder and magnetic circuit material are, the better of the torque transmitting characteristics of the magnetic powder clutch is.
Abstract: Based on component reliability and scatter factors of material, a new procedure is proposed to modify fatigue curves. The scatter characteristics of fatigue life and strength are investigated. The relationship between modified S-N curves and scatter factors of material is presented. The safety evaluation procedure for fatigue damage based on finite element analysis is performed.
Abstract: This paper presents a study on cutting parameters on the roundness error on drilling of an armour steel –Glass fiber reinforced plastic sandwiched plate, which is extensively used in defence industries. The influence of parameters on roundness error is presented in detail. The results indicated that the increase of feed rate increases the roundness error, whereas the increase of spindle speed reduce the roundness error in drilling. The results are analysed through graphs and presented in this study.
Abstract: Hybrid Metal Matrix composite consists of at least three constituents. Machining of metal matrix composite (MMC) is difficult due to the presence of hard abrasive particles. To make the composite prone to easy machining graphite is added. Machining is a material removal process and therefore is important for the final fabrication stage prior to application. This paper discusses the influence of cutting parameter on Torque in drilling of hybrid metal matrix composites. The experiments are conducted to study the effect of spindle speed and feed rate on torque using TiN coated solid carbide twist drill of 4mm, 8mm and 12mm under dry machining condition. The influence of parameters are discussed and studied in detail.
Abstract: In order to solve the problem of quickly fading on tent cloth material, this paper presents a new formulation of a four-color printing coating on inorganic pigment. As an actual application, the desert type camouflage coating is tested and completed. At the same time, this paper adopts a new method to design a digital camouflage based on the natural background. That is to extract main colors of background using clustering segmentation, as well as fill in the camouflage spots using mosaic blocks. The test demonstrates that, after the designed desert pattern is printed on the tent cloth, the tent made from the tent cloth is placed into the desert background. It can reach a good camouflage effect.
Abstract: We give a description of the phase transition in an ensemble of the electric dipole with internal degrees of freedom in dielectric glass model.The model predicts a freezing of the random projections of the electric dipole moments. The low temperature phase transition from disordered paraelectric phase to the electric dipole orientational like glass phase is considered
Abstract: This paper has studied the optical properties of the semiconductor materials InP/InGaAsP from the molecular dynamics under different temperature conditions, and analyzed the effect of the different doping ratio on the light absorption properties of InxGa1-xAsyP1-y。 The research of this topic provides a method from the theoretical calculations for in search of new fiber-optic sensing materials.
Abstract: In this paper, thin films of tin monosulfide (SnS) were successfully prepared by close-spaced sublimation (CSS) on the source temperature of 650 °C and 720 °C using SnS powder as a source. The influence of the source temperature on the chemical composition, crystal structure, surface morphology, and direct band gap of SnS thin films was systemically investigated by energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), scanning electron microscope (SEM), UV-Vis-NIR absorption spectra, respectively. The results showed that the SnS grain size increased from 3 μm to 20 μm by increase of the source temperature from 650 °C to 720 °C. The direct band gaps of SnS thin films prepared at different source temperatures 650 °C and 720 °C were 1.21 and 1.15 eV, respectively.
Abstract: This paper presents a subsection approximate nonlinear model predictive control (SANMPC) method for synchronous generator excitation control in the regional power grid. The proposed SANMPC considers the voltage as the reference trajectories and the change range of active power, reactive power and voltage as unequal constraints. Segmenting for a sampling interval, it uses sampled values and the control input initial value at the current sampling moment to predict the state at each segment by the Explicit Euler method. The predictive equations of the next sampling moment can be obtained by the predictive state and the control input at the penultimate segment, and form the optimal control problem which may be solved by the interior-point method. We take advantage of a four-machine power system to verify the effectiveness of the proposed SANMPC method under MATLAB platform. The simulating results show that the SANMPC method is simple and efficient, and greatly improves the transient stability compared with the conventional controller both.