Applied Mechanics and Materials Vols. 325-326

Abstract: This paper focuses on a scheduling problem in photolithography process of semiconductor manufacturing. The photolithography equipment can be divided into three main parts, that is, scanner, spinner, and developer. Generally, in like manner to the other processes, the identical product types are processed at the same time in photolithography process since a certain amount of recipe change time is required whenever product type is changed. So, in this research, we consider multi-product production case with different processing times and flow recipes, and then attempt to reduce total processing time in photolithography process. From this research, we show that the total processing time can be minimized if we give a variety of input orders of lots and wafers.

Abstract: FreeCutting Austenite Stainless Steel 303CuS2(%:≤0.08C,8.00~10.00Ni, 17.00~19.00Cr, 1.50~3.50Cu,0.24~0.35S) is smelted by 60t Electric Arc Furnace~60t Argon Oxygen Decarburization~60t Ladle Furnace~3 Flow continuous casting machine. With decreasing basicity of AOD refining slag from 2.0 to 1.6, controlling AOD tapping slag amount and tapping temperature, the [S] in AOD tapping steel increases to 0.008%~0.012% from original 0.004%~0.006%, after feeding S-wire containing 50% S and controlling the end temperature, the yield of S increases to 60%~70% from original 30%~50%, the qualified ratio of raises from 85% to 100%.

Abstract: The study of effects of high temperature on asphalt binder based on viscoelasticity theory will help clarify the influence mechanism of temperature on asphalt binder. Based on the theory of viscoelasticity, the Dynamic Shear Rheology test is used as study method. The objective of this study is to analyze and determine the features of asphalt binder under the effect of high temperature. Meanwhile, study subjects are AH70 asphalt, SBS modified asphalt and MAC modified asphalt. The result indicates that temperature increases have great influence on asphalt binder, which are shown by the variation of parameters quickly decrease. The relationship between temperature and such parameters as complex modulus, storage modulus, loss modulus, complex viscosity, storage viscosity, loss viscosity, rutting resistance parameter and fatigue resistance parameter can be described as regression of power function.

Abstract: Strain Galactomyces sp. M-2 from activated sludge was used as parent strain and then UV mutation breeding was performed. Finally we obtained a quality strain UVM8 suitable for the production of bioflocculant which flocculating activity is 92.8%. It showed there is excellent stable flocculating activity for stain UVM8 in the flocculating stability experiment. Further studies showed the best flocculation effect was obtained when C/N ration is 20:2 and pH is 8 in the initial culture medium.

Abstract: Drug-release systems are studied lately for increasing absorption in the body and improve the therapeutic effectiveness is key objective. Whatever form it may take a drug release system: tablet, implant, injectable suspension or transdermal system, the basic unit on which effective therapeutic drug particle. Knowledge of particle size distribution in a disperse system is of great importance in pharmaceutical technology. The size, surface area and volume-surface particle may be relevant to the physical, chemical and pharmacological drug toxicities. Stability and speed of dissolution of ketoprofen are much reduced in pure and coupled with a solubility promoter, enhances the bioavailability and particle size distribution depends. In order to improve absorption properties of ketoprofen were synthesized drug microparticles containing ketoprofen and hydroxypropyl beta cyclodextrin. Drug microparticles were studied by SEM microscopy and the results correlated with solubility properties. It was found that microparticles obtained are more easily soluble than pure ketoprofen and small size increases bioavailability.

Abstract: According to supercritical CO₂ Extraction and characteristics of tiller onion crush the processing, we have established a differential mass conservation model, Extraction rate was accurately obtained in the differential mass conservation model based on the characteristics of the BP neural network. Through further training, we got the network training and simulation figures. Finally, the differential mass conservation model was solved.

Abstract: The purpose of this article is to make a quantitative research on high frequency vibration recoverys advantages over traditional production methods. In this paper, acoustic pressure relation equation was established and a quantitative description about the porous media reservoir and fluid parameters alteration after high frequency vibration effect were attained. Furthermore, a preliminary mathematical model and computer modeling under high frequency vibration effect in low permeability reservoir were developed. This study was successfully applied to simulation of high frequency vibration recovery in a low permeability reservoir in Western China. The result showed that high frequency vibration recovery could stimulate single well production. By comparing with the well actual production history, it shows that this study can accurately simulate production performance of high frequency vibration recovery enhancement technology in low-permeability reservoirs.

Abstract: A theoretical model consisting of 5 energy levels in coupled four-wave mixing processes was proposed to analyze the coherent characteristics of atomic wavepackets using perturbative theory. The equations of motions of the density matrix were derived and the third-order density matrix elements were presented. Under the condition that the duration of laser pulses is sufficiently short, the system response was treated as impulse response. Moreover, in the lowest order perturbation theory, the third-order nonlinear polarization was obtained using rotating-wave approximation. The results show that multiple quantum beats are embedded in the coupled four-wave mixing signals, and coherent dynamics of wavepackets can be retrieved from the quantum beat dynamics.

Abstract: A three-dimensional progressive damage model is proposed to predict the open-hole tensile strength of Glare laminates. For the glass fiber reinforced epoxy the user subroutine UMAT is employed for description of the failure modes, such as matrix cracking and fiber failure. Behavior of the delamination between plies of the laminate is described using cohesive elements. Laminates with a rhombic hole, a square hole and a circular hole are taken into consideration separately. The results obtained by the present solution approach are validated with those available in the literatures.

Abstract: A technology route of Reverse flotation of acid-consuming gangue mineralsAcid leaching for copperExtractingElectrodepositing is proposed for recovery copper from a tailings with high content of calcium oxide and magnesium oxide and high content of combined copper oxide. The effect of H₂SO₄ concentration, leaching time and stirring speed on copper leaching was investigated. The leaching solution obtained under the optimal copper leaching conditions, was used to be proceeded for extracting and electrodepositing test. The best leaching conditions are stirring speed of 30 m/min, H₂SO₄ concentration of 150 Kg/t ore, leaching time of 30 minutes. Under the best conditions, the acid leaching test presented that the production of per ton copper consumes sulfuric acid of 17.31 t, and Cu leaching rate is 84.70%.