Finite Element Simulation of Magnesium Alloy AZ31 Tube Bending

A finite element method based model has been developed for magnesium alloy AZ31 tube bending process simulation, using the tensile (for bend outer radius) and compressive (for bend inner radius) properties of the AZ31 alloy at the bending temperature of 150°C. The results shown that very high compressive stresses are developed in the bend inner radius, limiting the minimum bend radius for the AZ31 tube. The simulation results suggest the minimum centerline bend radius to the tube outer diameter ratio is 1.5 to 2. The maximum diameter to thickness ratio is 30

Implementing Self-Adaptive Software Architecture by Reflective Component Model and Dynamic AOP: A Case Study

Abstract—Architecture-based method, which implements self-managing characteristics by dynamically configuring or reconfiguring the runtime architecture, has been widely accepted as a promising approach for self-adaptive systems. Some reflective architecture and component models like Fractal are proposed to support dynamic architecture adaptations through introspection and reconfiguration APIs. We believe dynamic AOP (Aspect-Oriented Programming) should also be employed as a complementary means for crosscutting adaptations. In this paper, we conduct a case study on implementing self-adaptive software architecture by reflective component model (Fractal) and dynamic AOP in an industrial Web-based system. With the case study, we hope to evaluate pros and cons of reflective component and dynamic AOP in implementing self-adaptive software architecture. In our case study, we identify four typical self-adaptation scenarios with the solutions. We also evaluate both approaches in terms of effectiveness, runtime efficiency and development/maintenance efforts. Our case study shows that reflective component model and dynamic AOP are effective for structural architecture adaptations, but have shortages in flexibility and do not support behavioral adaptation. Keywords-self-adaptive architecture; reflective component; Fractal; dynamic AOP I

Finite Element Simulation of Magnesium Alloy AZ31 Tube Bending

A finite element method based model has been developed for magnesium alloy AZ31 tube bending process simulation, using the tensile (for bend outer radius) and compressive (for bend inner radius) properties of the AZ31 alloy at the bending temperature of 150°C. The results shown that very high compressive stresses are developed in the bend inner radius, limiting the minimum bend radius for the AZ31 tube. The simulation results suggest the minimum centerline bend radius to the tube outer diameter ratio is 1.5 to 2. The maximum diameter to thickness ratio is 30

Finite Element Simulation of Magnesium Alloy AZ31 Tube Bending

A finite element method based model has been developed for magnesium alloy AZ31 tube bending process simulation, using the tensile (for bend outer radius) and compressive (for bend inner radius) properties of the AZ31 alloy at the bending temperature of 150°C. The results shown that very high compressive stresses are developed in the bend inner radius, limiting the minimum bend radius for the AZ31 tube. The simulation results suggest the minimum centerline bend radius to the tube outer diameter ratio is 1.5 to 2. The maximum diameter to thickness ratio is 30

A Computer Aided Grading System for Subjective Tests

Computer aided tests replace traditional written answers on paper sheets with electronic records. For subjective tests, computers are not able to do all grading jobs, due to limited comprehensive ability of computers. Subjective answers need be reviewed by different graders in order to improve justice. We propose a distributed computational model for grading electronic subjective answers. Answer data are divided into numerous independent data cells. Computational resources are automatically allocated by the system to do grading jobs and independently report grading results to the system. Since the grading results may vary slightly or magnificently, we assign computational factors to data cells and computational resources to minimize the variation. In addition, rules are defined to obtain a final result. We successfully apply the proposed model in our grading system in computer aided spoken English tests. 1

Effect of Extrusion Speed on the Microstructure and Tensile Properties of AZ31 Alloy

The influences of extrusion speed on the microstructure and tensile properties of AZ31 alloy were investigated. The results suggested that the yield and tensile strength of AZ31 alloy decrease but elongation increases with the reduction of extruded speed. High speed extrusion produces fine grains with texture of c-axis perpendicular with extruded direction. The tension deformation is dominated by slip and the formed texture is obstructive for the basal slip, and also the inhomogeneous structure formed at high speed extrusion is harmful to the ductility. Samples extruded at low speed have comparatively homogeneous and coarse microstructure. Twinning provided more tension deformation and the lattice rotation induced by twinning is favorable for the activities of new slip systems, which induced the better ductility of AZ31 alloy

Comprehensive Proteomic Analysis of Colon Cancer Tissue Revealed the Reason for the Worse Prognosis of Right-Sided Colon Cancer and Mucinous Colon Cancer at the Protein Level

To clarify the molecular mechanisms underlying the poor prognosis of right-sided and mucinous colon cancer at the proteomic level. A tandem mass tag-proteomics approach was used to identify differentially expressed proteins (DEPs) in colon carcinoma tissues from different locations and with different histological types to reveal the underlying mechanisms of these differences at the protein level. In additional, the DEPs were analyzed using bioinformatics methods. The proteomics profiles among colon cancers with different tumor locations and histological types were dramatically distinguished. In terms of tumor locations, the right-sided carcinoma specific DEPs may promote the tumor progression via activating inflammation, metastasis associated pathways. When referring to histological types, the mucinous colon cancers perhaps increased the invasion and metastasis through distinct mechanisms in different tumor locations. For mucinous cancer located in right-sided colon, the mucinous specific DEPs were mainly associated with ECM-related remodeling and the IL-17 signal pathway. For mucinous cancer located in left-sided colon, the mucinous specific DEPs showed a strong relationship with ACE2/Ang-(1–7)/MasR axis. The proteomics profiles of colon cancers showed distinct differences related to locations and histological types. These results suggested a distinct mechanism underlying the diverse subtypes of colon cancers

The Influence of Sr Addition on the Microstructure and Mechanical Properties of Aluminum Die-casting Alloys

The effects of strontium addition on the microstructure and mechanical properties of aluminum alloys 380 and 413 are researched. All samples are prepared through high pressure die-casting, and the effect of the sample’s thickness is also compared. The results indicate that the Sr addition can refine the metallographic microstructure of two alloys in different degrees, mainly to eutectic Si phase. The mechanical properties of the two alloys are improved slightly through Sr modification to the thin wall castings. The enhancement of mechanical properties is evident to the thick wall castings