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The Specific Case Analysis of Biomineralization Induced by Sulfate Reducing Bacteria
( Hongwei Liu ),( Shuang Qin ),( Chaoyang Fu ),( Fei Xiao ),( Deli Wang ),( Xia Han ),( Tianli Wang ),( Hongfang Liu ) 한국부식방식학회(구 한국부식학회) 2017 Corrosion Science and Technology Vol.16 No.6
The effects of sulfate reducing bacteria (SRB) on the corrosion and scaling of the Q235 carbon steel has been investigated in the simulated sewage water and oil field gathering pipelines production water, using scanning electron microscopy (SEM), energy dispersive x-ray spectrometry (EDS), and three-dimensional stereoscopic microscope. Results indicated that the concentration of SRB reached the maximum value on the ninth day in simulated sewage water with a large amount of scaling on the surface of specimen. In oil field gathering pipelines, a large amount of scaling and mineralization of mineral salts and thick deposition of extracellular polymeric substance (EPS) layers were also observed on the surface of specimen. The thickness of biofilm was about 245 μm within 30 days. After adding microbicides, the thickness of corrosion products film was only up to 48 - 106 μm within 30 days, suggesting that SRB could induce biomineralization. Under-deposit corrosion morphology was uniform in the absence of microbicides while local corrosion was observed in the presence of microbicides.
Lu Wang,Xia Li,Hongwei Niu,Lin Yang,Mingqin Xu, Jiaojiao Yi 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.10
Cr was used to replace Nb, Ti, and Zr in a precursor alloy HfMoNbTiZr, and its effect on the microstructure, phase constitution,and mechanical properties of the newly formed alloys were investigated. Microstructural evolutions revealed thata cubic Laves phase emerged regardless of which element was substituted by Cr. The original single-phase BCC structureof the precursor alloy was thus deteriorated and replaced by two BCC and one cubic Laves phases. The formation of theLaves phase and BCC phases increased the strength to 2480 ± 40 MPa in the HfMoNbTiCr alloy, while the net-like structure(Laves phase) impeded the crack extension and compensated for the decreased plasticity due to the introduction of thebrittle-stiff Laves phase. The other two alloys, HfMoTiZrCr and HfMoNbZrCr, possessed lower strengths of 1400 ± 20 and1642 ± 23 MPa and exhibited a completely brittle fracture character, which was attributed to the high volume fraction andthe morphologies of the Laves phase.
Discrete-time Sliding Mode Control with Adaptive Reaching Law via Implicit Euler Method
Cong Wang,Hongwei Xia,Yanmin Wang,Shunqing Ren 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.1
In this paper, a novel adaptive reaching law-based discrete-time sliding mode control scheme is designed and analyzed for nonlinear disturbed systems. The higher-order sliding mode surface is used to obtain the homogeneous asymptotic accuracy of system states. The implicit Euler method is applied to the design of discrete reaching law for the first time, further to completely eliminate numerical chattering. Meanwhile, with the help of a highorder disturbance compensator, the widths of the quasi sliding mode band and attractiveness region are reduced to an adjustable order. The designed adaptive gain functions in the reaching law are able to decrease the reaching time without affecting the accuracy of sliding mode, and the finite number of steps for any initial state to enter the quasi sliding mode band is acquired. Simulation results on magnetic suspension systems are presented to validate the developed method.
Tao Yang,Sibo Wang,Xuyong Zhang,Jie Xia,Jun Guo,Jixue Hou,Hongwei Zhang,Xueling Chen,Xiangwei Wu 대한기생충학열대의학회 2016 The Korean Journal of Parasitology Vol.54 No.2
Human and animal alveolar echinococcosis (AE) are important helminth infections endemic in wide areas of the Northern hemisphere. Monitoring Echinococcus multilocularis viability and spread using real-time fluorescent imaging in vivo provides a fast method to evaluate the load of parasite. Here, we generated a kind of fluorescent protoscolices in vivo imaging model and utilized this model to assess the activity against E. multilocularis protoscolices of metformin (Met). Results indicated that JC-1 tagged E. multilocularis can be reliably and confidently used to monitor protoscolices in vitro and in vivo. The availability of this transient in vivo fluorescent imaging of E. multilocularis protoscolices constitutes an important step toward the long term bio-imaging research of the AE-infected mouse models. In addition, this will be of great interest for further research on infection strategies and development of drugs and vaccines against E. multilocularis and other cestodes.