Chongqing University of Technology

About: Chongqing University of Technology is a education organization based out in Chongqing, China. It is known for research contribution in the topics: Microstructure & Alloy. The organization has 5199 authors who have published 4205 publications receiving 35954 citations. The organization is also known as: Chongqing Institute of Technology.

Studies on wears of ultrafine-grained ceramic tool and common ceramic tool during hard turning using Archard wear model

Abstract: Hardened steels are difficult to be machined due to their high tensile strength and work-hardening rate, low thermal conductivity, and abrasive behavior. In this paper, finite element modeling (FEM) approaches with lagrangian increment method for 3D metal turning of hardened steel H13 by common ceramic tool and ultrafine-grained tool respectively have been investigated by simulation of DEFORM-3D software and turning test. Conditions of initial and boundary and turning process parameters have been chosen. Material properties of H13 and ceramic have been described in details. Johnson–Cook model of H13 model has been applied to the hard turning modeling. Archard wear model has been built, and the correlation coefficients were decided by reciprocating friction experiments. The simulation results showed that predicted primary turning force and maximum temperature in common ceramic are bigger than which was caused by ultrafine-grained ceramic tool for the ultrafine-grained ceramic tools have better thermal stability and bigger hardness. The wear depths of common ceramic tool are about many times than that of ultrafine-grained ceramic tool according to the simulation and experimental results. And their wear patterns are very different. The FEM simulation results have entirely explicated experimental results. The obtained results would provide the fundamental and practical guidelines of tool material choice for hard turning.

Preparation of highly dispersed carbon supported AuPt nanoparticles via a capping agent-free route for efficient methanol oxidation

Abstract: A facile synthesis of carbon-supported bimetallic AuPt catalysts via a capping agent-free route is reported. The synthesized AuPt nanoparticles are well dispersed with a narrow size distribution ranging from 2.50 to 4.50 nm. Compared with commercial PtRu/C and Pt/C nanoparticles, the present AuPt/C catalysts exhibit distinctly superior activity for the methanol oxidation reaction with notable CO tolerance. Moreover, the composition-dependent catalytic activity of AuPt/C catalysts is observed, which follows the order Au2Pt1/C > Au1Pt1/C > Au1Pt2/C.

UPLC/Q-TOFMS-Based Metabolomics Approach to Reveal the Protective Role of Other Herbs in An-Gong-Niu-Huang Wan Against the Hepatorenal Toxicity of Cinnabar and Realgar.

Abstract: An-Gong-Niu-Huang Wan (AGNH) is a well-known traditional Chinese medicine (TCM) recipe containing cinnabar (HgS) and realgar (As2S2). However, the application of AGNH is limited by the hepato- and nephrotoxicity of cinnabar and realgar. It should be noted that cinnabar and realgar in AGNH are not used alone, but rather combined with other herbs as formula to use. In this study, the protective effects and mechanisms of the other herbs in AGNH against the hepatorenal toxicity induced by cinnabar and realgar were investigated. The combination use of the other herbs in AGNH alleviated inflammatory cell infiltration and damage in the liver and kidney and restored the disturbed serum metabolic profile induced by cinnabar and realgar insults. By UPLC/Q-TOFMS combined with pattern recognition approaches, we identified 41 endogenous metabolites in the sera of mice that were related to the hepatorenal toxicity of cinnabar and realgar, 36 of which were restored to normal levels when various kinds of herbs were combined as compound recipe. These metabolites function as modulators in inflammation-associated glycerophospholipid, arachidonic acid, linoleic acid, sphingolipid, and ether lipid metabolic pathways. Notably, lysophosphatidylcholines (LysoPCs) were the most elevated among all of the metabolites detected after cinnabar and realgar treatment, while these LysoPCs did not show overt differences between the AGNH and saline control groups, which was associated with relatively unaffected or even up-regulated expression of lysophosphatidylcholine acyltransferase 1 (LPCAT1) and autotaxin (ATX). These findings indicated that other herbs in AGNH could have a protective effect against cinnabar- and realgar-induced hepatic and renal damage via modulating the disordered homeostasis of the glycerophospholipid, arachidonic acid, linoleic acid, ether lipid, and sphingolipid metabolism.

Highly Efficient Adsorption and Reduction of Cr(VI) Ions by a Core-Shell Fe3O4@UiO-66@PANI Composite.

Abstract: Herein, we reported a simple solvothermal and chemical oxidation method to synthesize a magnetic core–shell composite (Fe3O4@UiO-66@PANI) for Cr(VI) removal from wastewater. Due to the porosity and...