Fast and Stable Surface Feature Simulation for Particle-Based Fluids

In order to efficiently and realistically capture microscopic features of fluid surface,a fast and stable surface feature simulation approach for particle-based fluids is presented in this paper.This method employs a steady tension and adhesion model to construct surface features with the consideration of the adsorption effect of fluid to solid.Molecular cohesion and surface area minimization are appended for surface tension,and adhesion is added to better show the microscopic characteristics of fluid surface.Besides,the model is integrated to an implicit incompressible smoothed particle hydrodynamics(SPH)method to improve the efficiency and stability of simulation.The experimental results demonstrate that the method can better simulates surface features in a variety of scenarios stably and efficiently.

Pure Red Cell Aplasia Caused by Parvovirus B19 in Patients with Human Immunodeficiency Virus Infection: A Series of Four Cases

Parvovirus B19(B19V)infection can cause pure red cell aplasia(PRCA)in patients with human immunodeficiency virus(HIV)infection.Intravenous immunoglobulin(IVIG)is a preferred treatment option.From July 2019 to March 2022,four patients with HIV infection were admitted to Guangzhou Eighth People’s Hospital with dizziness and fatigue and were diagnosed with PRCA.Blood investigations revealed severe anemia and the B19V genome.Therefore,the four patients were diagnosed with B19V-induced PRCA.All four patients received red blood cell transfusion in the setting of antiretroviral therapy,and two of the four patients received intravenous immunoglobulin(IVIG).After 3-7 months of treatment,all four patients recovered,although two did not receive IVIG.This suggests that IVIG is not always necessary for the treatment of PRCA in patients with HIV infection and that effective antiretroviral therapy and immunological reconstitution play an important role in the eradication of parvovirus.

Experimental and theoretical study of microwave enhanced catalytic hydrodesulfurization of thiophene in a continuous-flow reactor

Hydrodesulfiirization(HDS)of thiophene,as a gasoline model oil,over an industrial Ni-Mo/Al2O3 catalyst was investigated in a continuous system under microwave irradiation.The HDS efficiency was much higher(5%-14%)under microwave irradiation than conventional heating.It was proved that the reaction was enhanced by both microwave thermal and non-thermal effects.Microwave selective heating caused hot spots inside the catalyst,thus improved the reaction rate.From the analysis of the non-thermal effect,the molecular collisions were significantly increased under microwave irradiation.However,instead of being reduced,the apparent activation energy increased.This may be due to the microwave treatment hindering the adsorption though upright S-bind(η1)and enhancing the parallel adsorption(η5),both adsorptions were considered to favor to the direct desulfurization route and the hydrogenation route respectively.Therefore,the HDS process was considered to proceed along the hydrogenation route under microwave irradiation.

Synthesis of boron modified CoMo/Al_(2)O_(3) catalyst under different heating methods and its gasoline hydrodesulfurization performance

Catalytic hydrodesulfurization(HDS)technique is widely used for clean gasoline production.However,traditional HDS catalyst(CoMo/γ-Al_(2)O_(3))exhibits high hydrogenation performance of olefins(HYDO),resulting in the loss of gasoline octane number.To achieve high HDS/HYDO ratio,the key issue is to reduce the interaction between active metals and the support,therefore,in this research,the modified CoMo/γ-Al_(2)O_(3)catalysts with various boron amounts were investigated under traditional or microwave heating.The effects of preparing methods as well as boron amounts on the active phase,acidic properties and HDS catalytic activities were examined.Results show that the modification,especially under microwave treatment,can significantly weaken the interaction between the active component and the support by enlarging the surface area and pore diameter,and reducing the acidity of the support.As a result,the stacking numbers of MoS_(2) slabs were obviously improved by the modification and microwave treatment,contributing to higher edge/rim ratio,and resulting in higher HDS performance and selectivity to olefin.