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Hierarchical three-dimensional (3D) porous structures of nickel–cobalt layered double hydroxide (LDH) are grown on diatomite biotemplate via one-step hydrothermal method.

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Adaptive optics (AO) systems can suppress the signal fade induced by atmospheric turbulence in satellite-to-ground coherent optical communication. The lower bound of the signal fade under AO compensation was investigated by analyzing the pattern of aberration modes for a one-stage imaging AO system. The distribution of the root mean square of the residual aberration is discussed on the basis of the spatial and temporal characteristics of the residual aberration of the AO system. The effectiveness of the AO system for improving the performance of coherent optical communication is presented in terms of the bit error rate and system availability.

Experiments were performed to investigate the impact of inorganic carbon (IC) limitation on ammonia oxidizing bacteria (AOB). Results confirm that ammonia removal efficiency and AOB respiration rates are negatively impacted by IC limitation. Increased nitrogen oxides emissions (nitric and nitrous oxides (NO and N 2 O)) were also observed in IC limited reactors as compared with control reactors. These findings suggest that the metabolic response of AOB to IC limitation can elicit a previously undocumented increase in nitrogen oxide emission. These results further support the recently postulated link between low ammonia oxidation process efficiency and increased NO and N 2 O emissions.

Core–shell structured magnetic γ-Fe2O3 coated with proton acid doping polyaniline nanocomposites (γ-Fe2O3@PANI) were synthesized and used to adsorb arsenic­(V) in aqueous solutions. Results indicated that the as-synthesized γ-Fe2O3@PANI had a rapid adsorption rate and high adsorption capacity (0.502 mmol/g) for arsenic­(V) removal in a pH range of 4 to 11. The adsorption process obeyed a pseudo-second-order kinetic model and was controlled by intraparticle diffusion and external liquid film diffusion. The Redlich–Peterson isotherm model was suitable to simulate the experiment data, indicating that both the physical and chemical adsorption occurred on the heterogeneous adsorption interfaces. The postulated adsorption mechanism of As­(V) on the γ-Fe2O3@PANI nanocomposite was possibly ascribed to electrostatic interaction and hydrogen bonding. These results suggest that the magnetic γ-Fe2O3@PANI nanocomposite offers a promising candidate for the adsorption of As­(V) in practical applications.