Fast algorithm for inverting structure parameters of the horizontal multi-layer soil

A fast algorithm is presented to invert the structure parameter of the horizontal multi-layer soil. The procedure is divided into two independent stages. First, Fredholm equation of the first kind with respect to the apparent resistivity is solved by the technology of decay spectrum to reduce computation time greatly. Second, the structure parameter of soil is determined by the generalized Newton-Kantorovich method, which is more robust and less noise sensitive because of using the generalized inverse algorithm to solve the nonlinear equation group. The numerical results show the validities and main features of the proposed approach.     

蜜胺树脂在硝酸体系中对铑的吸附行为

研究了在硝酸介质中蜜胺树脂的对铑的吸附行为及其相关的影响因素，并对其吸附机理进行了初步探讨。     

A collision detection approach in virtual environment of micromanipulation robot

Operators suffer much diffieulty in manipulating miero-size objects without the assistance of friendly interfaces due to the scaling effects in micro worht. The paper presented a general framework for mieromanipulation robot hased on virtual reality technology. With the framework we brought forward a FDH （Fixed Direction Hulls） based hounding box method to handle the eollision ,teteetion of the peg-in-hole mieroassembly. The eollision response model for the collision between micro needle and hole was presented. The virtual three and corresponding displacement were calculated with the model of bending deformation and pressing ,teformation. Experiments verify the validity of collision response model.     

Phase- fi eld simulation of dendrite growth in the presence of lateral constraints

The effect of a sudden change in the crossing section on the microstructural evolution as well as solute and heat diffusions during solidification of the Ni-40.8% Cu alloy was investigated by implementing a non-isothermal phase-field model. Simulations with lateral constraints of different sizes were carried out to study the changes of the dendritic growth manner. Significant changes in microstructures had been observed as the interface encountered a sharply reduced crossing section; a cellular–dendrite transition could be achieved with lateral constraints, and the tip velocity significantly changed during the development of dendrite microstructures, and also, lateral constraints of different sizes had different effects on changes of the tip positions as well as tip velocities during the dendritic growing through constraints, which agreed well with experimental results.     

Derivation of P–T paths for Middle–Late Triassic very low-grade metapelite from Hongcan Well 1 in the Zoigê Depression and their tectonic implications

Using XRD measurements of illite crystallinity,b0values of K-rich white micas and chemical compositions of chlorites combined with homogenization temperatures of fluid inclusions in calcite,the metamorphic P–T conditions of very low-grade metapelites from different depths in the 7 km Hongcan Well 1 in the Zoige?Depression,Sichuan,China,have been obtained in this paper.Knowledge of the tectonic evolution of the studied basin allows us to derive geothermal curves for Middle and Late Triassic time(the geothermal peak)and the present day(from thermal logging of the borehole).The retrograde P–T tracks from clockwise P–T–t loops have been revealed by the plotting of individual samples on each geotherm,which can be interpreted by the lithospheric thickening due to sedimentation and folding followed by continuous uplift and erosion.A stratigraphic log indicates that the Well penetrates the steep limb of a fold which perturbed the peak geotherm and caused some P–T paths to cross.     

Improving the Efficiency of Multi-Objective Grasshopper Optimization Algorithm to Enhance Ontology Alignment

Ontology alignment is an essential and complex task to integrate heterogeneous ontology. The meta-heuristic algorithm has proven to be an effective method for ontology alignment.However, it only applies the inherent advantages of metaheuristics algorithm and rarely considers the execution efficiency,especially the multi-objective ontology alignment model. The performance of such multi-objective optimization models mostly depends on the well-distributed and the fast-converged set of solutions in ...     

球形β-TCP生物陶瓷的生物学性能观察

研究球形多孔β-TCP生物陶瓷体内植入后的生物学性能.将球形β-TCP生物陶瓷(直径2 cm,孔径(500～600)μm,内连接径(110～150)μm)植入成年新西兰兔的腰背肌筋膜袋中.术后1、2、4、8、12周取材,进行组织学、扫描电镜检查.植入材料未见炎性反应.术后1周细胞迁入;2周出现胶原纤维和幼稚的血管芽;4周时血管、胶原纤维数量增多;8周时大孔周边出现新月形新生骨和类骨质;12周时材料明显降解,组织内见成熟的血管及骨组织.球形多孔β-TCP生物陶瓷具有良好的生物学性能,其成骨过程为膜内成骨,血管化受内连接孔限制.     

High thermal conductivity and high strength magnesium alloy for high pressure die casting ultrathin-walled components

With the rapid development of 3 C industries,the demand for high-thermal-conductivity magnesium alloys with high mechanical performance is increasing quickly.However,the thermal conductivities of most common Mg foundry alloys(such as Mg-9 wt%-lwt%Zn) are still relatively low.In this study,we developed a high-thermal-conductivity Mg-4 Al-4 Zn-4 RE-1 Ca(wt%,AZEX4441) alloy with good mechanical properties for ultrathin-walled cellphone components via high-pressure die casting(HPDC).The HPDC AZEX444...     

Effect of Sc addition on microstructure and mechanical properties of 1460 alloy

The effect of minor addition of Sc on microstructure,age hardening behavior,tensile properties and fracture morphology of 1460 alloy have been studied. It is found that Sc content increase from 0.11 wt% to 0.22 wt% is favorable for grain refinement in as-cast alloy but results in a coarsening of Cu-rich particles. The alloy with 0.11 wt% Sc exhibits enhanced mechanical properties and age hardening effect. Transmission electron microscopy(TEM) investigations on the alloy with 0.11 wt% Sc have suggested that a large amount of Al3(Sc,Zr) particles precipitated at the earlier aging may inhibit recrystallization effectively.