Modernization of Air Supply Unit for Oxidation Towers Used in Bitumen Production

Chemical and Petroleum Engineering - The hydrodynamics of oxidation towers used for bitumen production were studied using a model tower having transparent walls. Experiments were carried out in two...     

Diffusion and perfusion MRI parameters in the evaluation of placenta accreta spectrum disorders in patients with placenta previa

Magnetic Resonance Materials in Physics, Biology and Medicine - To evaluate the placental function by monoexponential, biexponential, and diffusion kurtosis MR imaging (MRI) in patients with...     

Increasing Probability of Detecting Acoustic Emission Sources Using Artificial Neural Networks

Russian Journal of Nondestructive Testing - We study the possibilities of reducing the location error of acoustic emission (AE) sources for cases where AE sources are located near AE receiving...     

Influence of Variable Machining Conditions on the Precision in CNC Plunge Grinding: Predictive Analysis by a Digital Twin

Russian Engineering Research - A system for predicting the machining error for a batch of parts in CNC wheel grinding is described; the system takes the influence of technological variables into...     

Analysis of Rain-Induced Attenuation at Ku-V Band Using Gamma Drop Size Distribution Model Over a Tropical Region

Wireless Personal Communications - In this paper, modeling of rain drop size distribution (DSD) and analysis of rain-induced attenuation are analyzed based on Gamma DSD model in a tropical...     

Identifying Malicious Secondary User Presence Within Primary User Range in Cognitive Radio Networks

Wireless Personal Communications - Cognitive Radio (CR) Network is a wireless communication technology, in which a detection device smartly detects occupied and unoccupied channels. During traffic,...     

Multiagent Algorithms for Optimizing Bundles of Trajectories of Deterministic Systems with Incomplete Instant Feedback

Journal of Computer and Systems Sciences International - The problem of finding the optimal control of bundles of trajectories of continuous deterministic systems with incomplete feedback is...     

双功能催化剂上四氢萘加氢裂化生成单环芳烃的反应网络研究

Conversion of LCO (light cycle oil) to BTX (benzene, toluene, and xylene) is an economically valuable method for refineries. However, this approach still faces difficulties as the main reactions are not clearly understood. Here we study the detailed hydrocracking pathway of typical reactants, 1-methylnaphthalene and tetralin, through molecular simulations and experiments to improve our understanding of the conversion process of LCO to BTX. Molecular simulations demonstrate that the rate-determining step is the isomerization pathway of six-membered ring to five-membered ring in tetralin as its activation energy (ΔEa) is the highest among all the reactions and the order of ΔEa of reactions is isomerization > ring-opening ≈ side-chain cleavage. The results of experiments show that with the increase in reaction depth, i.e., through a high temperature (350 – 370 °C) and low LHSV (4.5 – 6.0 h−1), isomerization, ring-opening, and side-chain  cleavage reactions occurred, thus improving the selectivity and yield of alkyl aromatics.     

Torque Transfer to a Conducting Particle Using the Lorentz Force

Semiconductors - In this work, we discuss for the first time the principle of rotation in the constant electric field of a conducting particle with participation of the Lorentz force, which ensures...