Topology optimization has gained prime significance due to increasing demands of lightweight components. In this paper, a
general mathematical formulation of topology optimization is presented with some imperative manufacturing constraints for
maximizing the stiffness of a structure with mixed boundary conditions. A methodology is implemented to determine the optimal
configuration of operative structural components by executing TOSCA in batch-process mode with ANSYS software. CAD viable
design is attained by smoothing the topological optimized surfaces. The geometry at the maximum stressed areas is also optimized.
Analysis of the customized reduced weight configuration reveals that it comprises the harmonized stress distribution and improved
structural performance. 相似文献
Journal of Thermal Analysis and Calorimetry - This article addresses the time-dependent flow of magnetized rheological Carreau nanoliquid conveying microorganisms over a moving wedge with velocity... 相似文献
Catalytic oxidative desulfurization(ODS) of model oil and commercial oil samples was investigated using an air-assisted performic acid oxidation system with a phase transfer or emulsion catalyst comprising a quaternary ammonium salt-based heteropolyoxometalate.Different emulsion catalysts with a Keggin type heteroployoxometalate anion(containing W,Mo,and V) and cetyltrimethylammonium bromide cation were prepared and characterized by X-ray fluorescence,Fourier transform infrared spectroscopy,and scanning electron microscopy.[C16H33N(CH3)3]3[PW9Mo3O40] was the most effective catalyst in the current oxidation system,which reduced the sulfur content of the model oil from 1275 μg/g to 57 μg/g.The reactivity order of different model sulfur compounds was thiophene < dibenzothiophene < 4,6-dimethyldibenzothiophene. The ODS of model sulfur compounds followed first order kinetics with apparent activation energy from 29 to 27 kJ/mol.The catalysts also performed efficiently in the ODS of the industrial oil samples,including untreated naphtha,light gas oil,heavy gas oil,and Athabasca oil sands derived bitumen,for which sulfur removal rates were 83%,85%,68% and 64%,respectively. 相似文献
Two facile and efficient methods, to synthesize zinc oxide (ZnO) particles with different morphologies, have been reported here. Thermal decomposition route yielded micron sized irregular shaped ZnO particles. While co‐precipitation method rendered transparent flakes which then transformed to hexagonal discs with relatively more uniform size and shape. These hexagonal discs were further converted to the cone type morphology when hexamethylenetetramine was added in the precursor solution. However, spherical type ZnO nanoparticles were obtained by incorporating polyvinyl alcohol during co‐precipitation strategy. XRD confirmed the formation of wurtzite structure in all the samples. FTIR spectroscopy revealed the presence of ZnO characteristic peaks. Moreover, 3‐D directional growths and the presence of UV‐Vis broadband multi‐absorption peaks, and green to orange photoluminescence emissions confirmed the potential application of the synthesized ZnO particles in various piezoelectric and luminescence applications.
Sol-gel process was employed to synthesize the Pb-BSCCO system having general composition Bi2−xPbxSr2Ca2Cu3O10−δ, where x=0.2, 0.4 and 0.8. Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), dilatometry and vibrating sample
magnetometer (VSM) were employed to study the materials produced at different stages. Two-stage heating firstly at 300 and
then 800°C was adopted in order to avoid the burning of the materials and formation of carbonates. The carbonate formation
was avoided by heating the materials firstly at 300°C for 2 h and without intermediate cooling moved to the furnace having
temperature 800°C and hold for 2 h. The sintering behaviour of samples was studied by dilatometry and the results revealed
that the sample having x=0.4 was stabled up to a temperature of 700°C while samples having x=0.2 and 0.8 to a temperature of 625°C. The maximum shrinkage was observed at 850°C in all the samples. On the basis of dilatometry
results, the samples were sintered at 845°C for 60 h to observe the superconducting phases. The highest volume fraction of
high superconducting phase (2223) was noticed in the sample containing x=0.4 having onset Tc=110 K. 相似文献
Ion acoustic shock waves (IASW's) are studied in an unmagnetized plasma consisting of electrons, positrons and adiabatically hot positive ions. This is done by deriving the Kortweg-deVries-Burger (KdVB) equation under the small amplitude perturbation expansion method. The dissipation is introduced by taking into account the kinematic viscosity among the plasma constituents. It is found that the strength of ion acoustic shock wave is maximum for spherical, intermediate for cylindrical, and minimum for planar geometry. It is observed that the positron concentration, ratio of ion to electron temperature, and the plasma kinematic viscosity significantly modifies the shock structure. Finally, it is found that the temporal evolution of the non-planar IASW's is quite different by comparison with the planar geometry. The relevance of the present study with regard to the dense astrophysical environments is also pointed out. 相似文献
This paper proposed a model that explains the separation mechanism of oil-in-water emulsion taking into account both creaming and coalescence processes. Oil-in-water emulsion separation experiments were performed in a batch separator using kerosene and distilled water. The predictions of the proposed model agreed well with the experimental results as well as previously published experimental data. The comparison between the proposed model and the previously published model showed that the proposed model has higher accuracy in predicting the separation profile of oil-in-water emulsion, with an accuracy of within 10%. Thus the proposed model gives better representation of the oil-in-water emulsion separation process. 相似文献
Journal of Thermal Analysis and Calorimetry - In this paper, the mechanism of radiative Oldroyd-B nanofluid flow over a rotating disk with activation energy and motile microorganisms is examined.... 相似文献
The increasing demand for sustainable energy has diverted researchers’ intentions toward electrochemical storage devices. This research aims to combine supercapacitors’ characteristics with batteries to create high-performance hybrid energy storage devices. The hydrothermal approach is used to synthesize silver sulfide (Ag2S), strontium sulfide (SrS), and their composite silver strontium sulfide (AgSrS). XRD is used to evaluate the crystallinity, SEM is used to study the surface morphology, and XPS is used to determine the elemental composition of AgSrS. The BET measurements show a higher surface area of 22.23 m2g−1 for AgSrS. The highest achieved specific capacity with AgSrS is 494.5 C g−1 (137.36 mAh-g−1). The best-tuned material, AgSrS, is then used as the anode in a powered hybrid device with activated carbon (A.C.) as the cathode terminal. This device provides an energy of 26.32 Wh-kg−1 at a power of 800 W kg−1. The device was also put through a durability test, which included 5000 consecutive cycles. After 5000 cycles, a columbic efficiency of 82% was achieved, with 96% capacity retention. This research shows that the composite material AgSrS can be utilized commercially for hybrid energy storage devices in the future.