A series of oxidants supported on coconut shell-based activated carbon(CAC) through microwave irradiation were prepared and characterized using scanning electron microscopy(SEM), N_2 adsorption/desorption analysis, an...A series of oxidants supported on coconut shell-based activated carbon(CAC) through microwave irradiation were prepared and characterized using scanning electron microscopy(SEM), N_2 adsorption/desorption analysis, and X-ray photoelectron spectroscopy(XPS). The SO_2 adsorption capacities and rates were evaluated by adsorption tests performed in a fixed bed reactor with a simulated flue gas, and the adsorption isotherm models were validated against the experimental results. The findings revealed that the SO_2 adsorption capacity decreased in the following order: MW-K_2Cr_2O_7-CAC > MWKMnO_4-CAC > MW-H_2O_2-CAC > MW-CAC. The SO_2 adsorption capacities and adsorption rates of the samples increased with an increasing oxidizability of the oxidants owing to the increment of mean pore size and oxygen-containing functional groups. In addition, a high initial SO_2 concentration and a low bed temperature could positively affect the SO2 adsorption. Finally, the Langmuir model validated that SO_2 was mainly adsorbed through chemical adsorption on the sample surfaces.展开更多
The lack of Birkhoff theorem in finite-range gravitation reveals nonzero acceleration of the test body inside the massive spherical shell, as well as breakdown of screening inside the charged conductor gives rise to a...The lack of Birkhoff theorem in finite-range gravitation reveals nonzero acceleration of the test body inside the massive spherical shell, as well as breakdown of screening inside the charged conductor gives rise to acceleration of the test charge. An application of this effect to the motion of galaxies in Local Group allows to constraint quintessence parameter in some massive gravitational theories.展开更多
采用LS-DYNA显式非线动力有限元程序,数值模拟了内置柱壳/组簧和泡沫铝夹层的防爆罐在3 kg TNT爆炸载荷作用下的抗爆性能。结果表明:该防爆罐内壁面压力载荷呈现多次脉动特征。比冲量载荷经历数次阶跃上升。柱壳/组簧结构可以将爆炸能...采用LS-DYNA显式非线动力有限元程序,数值模拟了内置柱壳/组簧和泡沫铝夹层的防爆罐在3 kg TNT爆炸载荷作用下的抗爆性能。结果表明:该防爆罐内壁面压力载荷呈现多次脉动特征。比冲量载荷经历数次阶跃上升。柱壳/组簧结构可以将爆炸能量更加均匀地传递给泡沫铝吸能夹层,在保证防爆罐内筒不发生塑性变形的前提下,可使泡沫铝的吸能效率显著提高。定量分析防爆罐内部各物质、各结构间的能量转化与吸收,表明泡沫铝夹层可通过卸载动能和透射应力波的形式较好吸收、转移内层钢板所获得的冲击能量。展开更多
文摘A series of oxidants supported on coconut shell-based activated carbon(CAC) through microwave irradiation were prepared and characterized using scanning electron microscopy(SEM), N_2 adsorption/desorption analysis, and X-ray photoelectron spectroscopy(XPS). The SO_2 adsorption capacities and rates were evaluated by adsorption tests performed in a fixed bed reactor with a simulated flue gas, and the adsorption isotherm models were validated against the experimental results. The findings revealed that the SO_2 adsorption capacity decreased in the following order: MW-K_2Cr_2O_7-CAC > MWKMnO_4-CAC > MW-H_2O_2-CAC > MW-CAC. The SO_2 adsorption capacities and adsorption rates of the samples increased with an increasing oxidizability of the oxidants owing to the increment of mean pore size and oxygen-containing functional groups. In addition, a high initial SO_2 concentration and a low bed temperature could positively affect the SO2 adsorption. Finally, the Langmuir model validated that SO_2 was mainly adsorbed through chemical adsorption on the sample surfaces.
文摘The lack of Birkhoff theorem in finite-range gravitation reveals nonzero acceleration of the test body inside the massive spherical shell, as well as breakdown of screening inside the charged conductor gives rise to acceleration of the test charge. An application of this effect to the motion of galaxies in Local Group allows to constraint quintessence parameter in some massive gravitational theories.
文摘采用LS-DYNA显式非线动力有限元程序,数值模拟了内置柱壳/组簧和泡沫铝夹层的防爆罐在3 kg TNT爆炸载荷作用下的抗爆性能。结果表明:该防爆罐内壁面压力载荷呈现多次脉动特征。比冲量载荷经历数次阶跃上升。柱壳/组簧结构可以将爆炸能量更加均匀地传递给泡沫铝吸能夹层,在保证防爆罐内筒不发生塑性变形的前提下,可使泡沫铝的吸能效率显著提高。定量分析防爆罐内部各物质、各结构间的能量转化与吸收,表明泡沫铝夹层可通过卸载动能和透射应力波的形式较好吸收、转移内层钢板所获得的冲击能量。
