DFT Study of Cyanide Oxidation on Ge-Doped Carbon Nanotubes

In recent years, the discovery of efficient catalyst with low price to cyanide (CN) oxidation in normal temperature is a major concern in the industry. In present study, in first step the carbon nanotubes (CNTss) were doped with Ge and the surface of Ge-doped CNTss via O₂ molecule were activated. In second step the CN oxidation on activated Ge-CNTss surface via Langmuir–Hinshelwood (LH) and Eley–Rideal (ER) mechanisms was investigated. Results show that O₂ activated Ge-CNTs surface can oxidize the CN molecule via Ge-CNTs–O–O* + CN → Ge-CNTs–O–O*–CN → Ge-CNTs–O* + OCN and Ge-CNTs–O* + CN → Ge-CNTs + OCN reactions. Results show that CN oxidation on activated Ge-CNTs surface via the LH mechanism has lower energy barrier than ER mechanism. Finally, calculated parameters reveal that activated Ge-CNTss is acceptable catalyst with low price and high performance for CN oxidation in normal temperature.     

Lateral pull-in instability of electrostatic MEMS transducers employing repulsive force

Nonlinear Dynamics - We report on the lateral pull-in in capacitive MEMS transducers that employ a repulsive electrostatic force. The moving element in this system undergoes motion in two...     

Adsorption and degradation of methyl parathion (MP), a toxic organophosphorus pesticide,using NaY/Mn0.5Zn0.5Fe2O4 nanocomposite

Research on Chemical Intermediates - In this research, the applicability of NaY/Mn0.5Zn0.5Fe2O4 as a new synthesized nanocomposite adsorbent for the adsorption and degradation of methyl parathion...     

Synthesis of Spiro Pyrrolobenzothiazole Derivatives via a Three‐Component Reaction

A novel three‐component reaction involving 2‐methylbenzothiazole or 2,5‐dimethylbenzothiazole, acetylenic esters and 1,3‐dicarbonyl compounds such as (1,3‐dimethylbarbituric acid or 1,3‐indanedione) leading to the synthesis of spiro pyrrolobenzothiazole derivatives. The reactions proceeded smoothly at room temperature without using any catalyst. This method is very useful to functionalize benzothiazole derivatives in a one‐pot operation. The structures of the synthesized compounds have been characterized by spectral studies.     

The design of a five-cell high-current superconducting cavity

Energy recovery linacs are promising for achieving high average current with superior beam quality. The key component for accelerating such high-current beams is the superconducting radio-frequency cavity. The design of a 1.3 GHz five-cell high-current superconducting cavity has been carried out under cooperation between Peking University and the Argonne National Laboratory. The radio-frequency properties, damping of the higher order modes, multipacting and mechanical features of this cavity have been discussed and the final design is presented.     

Analytical and Experimental Study to Predict the Residual Resistance Factor on Polymer Flooding Process in Fractured Medium

The major objectives of this study are to analytically and experimentally determine the residual resistance factor in the fractured medium based on the polymer solution properties and operational conditions. The parameters considered in this study are the polymer concentration, power law constitutive equation parameter, and salt concentration, sulfonation content of polymer, temperature, and molecular weight of the water soluble polymers which are used in polymer flooding for enhanced oil recovery. The results indicated that residual resistance factor in fractured medium is dependent on the coil overlap parameter and power law equation parameter of polymer. The coil overlap parameter is a dimensionless number consists of intrinsic viscosity and polymer concentration. Since intrinsic viscosity is a function of polymer diameter in medium conditions, to predict the residual resistance factor in fracture medium, an experimental correlation is generated for determination of the molecular diameter of polymer based on polymer molecular weight, temperature, salt concentration, and sulfonation content.