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Diaoyu Zhou,Taotao Li,Jing Fan 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.6
Effects of plastic deformation on the corrosion behaviors of AA6061 aluminum alloy have been investigated in this work. AA6061 was severely deformed by cold rolling processes and the corrosion behaviors were measured using electrochemicaltests in 3.5 wt% NaCl neutral solution. The microstructures were characterized by SEM combined with EDS. The resultsshowed that plastic deformation induced the decrease of average pitting potential and increase of corrosion rate of AA6061due to the number increase and size decrease of second-phase particles, which formed "small cathode-large anode" microbatterycorrosion mechanism with the aluminum alloy matrix. The influence of crystallographic texture on corrosion propertyis analyzed and a simple relation between average pitting corrosion coefficient and texture coefficient is built and supportedby experiments to elucidate the effects of plastic deformation on corrosion.
Acetate-assisted Synthesis of Chromium(III) Terephthalate and Its Gas Adsorption Properties
Jing-jing Zhou,Kai-yu Liu,Chun-long Kong,Liang Chen 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.6
We report a facile synthetic approach of high-quality chromium(III) terephthalate [MIL-101(Cr)] by acetateassisted method in the absence of toxic HF. Results indicate that the morphology and surface area of the MIL- 101(Cr) can be tuned by modifying the molar ratio of acetate/Cr(NO3)3. The Brunauer-Emmett-Teller (BET) surface area of MIL-101(Cr) synthesized at the optimized condition can exceed 3300 m2/g. It is confirmed that acetate could promote the dissolution of di-carboxylic linker and accelerate the nucleation ratio. So the pure and small size of MIL-101(Cr) with clean pores can be obtained. CO2, CH4 and N2 adsorption isotherms of the samples are studied at 298 K and 313 K. Compared with the traditional method, MIL-101(Cr) synthesized by acetate-assisted method possess enhanced CO2 selective adsorption capacity. At 1.0 bar 298 K, it exhibits 47% enhanced CO2 adsorption capacity. This may be attributed to the high surface area together with clean pores of MIL-101(Cr).
Acetate-assisted Synthesis of Chromium(III) Terephthalate and Its Gas Adsorption Properties
Zhou, Jing-Jing,Liu, Kai-Yu,Kong, Chun-Long,Chen, Liang Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.6
We report a facile synthetic approach of high-quality chromium(III) terephthalate [MIL-101(Cr)] by acetate-assisted method in the absence of toxic HF. Results indicate that the morphology and surface area of the MIL-101(Cr) can be tuned by modifying the molar ratio of acetate/$Cr(NO_3)_3$. The Brunauer-Emmett-Teller (BET) surface area of MIL-101(Cr) synthesized at the optimized condition can exceed 3300 $m^2/g$. It is confirmed that acetate could promote the dissolution of di-carboxylic linker and accelerate the nucleation ratio. So the pure and small size of MIL-101(Cr) with clean pores can be obtained. $CO_2$, $CH_4$ and $N_2$ adsorption isotherms of the samples are studied at 298 K and 313 K. Compared with the traditional method, MIL-101(Cr) synthesized by acetate-assisted method possess enhanced $CO_2$ selective adsorption capacity. At 1.0 bar 298 K, it exhibits 47% enhanced $CO_2$ adsorption capacity. This may be attributed to the high surface area together with clean pores of MIL-101(Cr).
Facial Feature Recognition based on ASNMF Method
( Jing Zhou ),( Tianjiang Wang ) 한국인터넷정보학회 2019 KSII Transactions on Internet and Information Syst Vol.13 No.12
Since Sparse Nonnegative Matrix Factorization (SNMF) method can control the sparsity of the decomposed matrix, and then it can be adopted to control the sparsity of facial feature extraction and recognition. In order to improve the accuracy of SNMF method for facial feature recognition, new additive iterative rules based on the improved iterative step sizes are proposed to improve the SNMF method, and then the traditional multiplicative iterative rules of SNMF are transformed to additive iterative rules. Meanwhile, to further increase the sparsity of the basis matrix decomposed by the improved SNMF method, a threshold-sparse constraint is adopted to make the basis matrix to a zero-one matrix, which can further improve the accuracy of facial feature recognition. The improved SNMF method based on the additive iterative rules and threshold-sparse constraint is abbreviated as ASNMF, which is adopted to recognize the ORL and CK+ facial datasets, and achieved recognition rate of 96% and 100%, respectively. Meanwhile, from the results of the contrast experiments, it can be found that the recognition rate achieved by the ASNMF method is obviously higher than the basic NMF, traditional SNMF, convex nonnegative matrix factorization (CNMF) and Deep NMF.
Zhou, Zixiong,Kim, Jong Won,Zhao, Jing,Qi, Jing,Choi, Seong Jin,Lim, Chae Woong,Lee, Moo-Yeol,Lee, Kyuhong,Kim, Bumseok Elsevier 2018 Toxicology in vitro Vol.52 No.-
<P><B>Abstract</B></P> <P>Accumulative evidence showed that cigarette smoke (CS) detrimentally affects the pathogenesis of nonalcoholic steatohepatitis (NASH). The purpose of this study was to evaluate the effects of CS extract (CSE) or total particulate matter (TPM) on the <I>in vitro</I> steatohepatitis model using mouse primary hepatocytes treated with palmitic acid (PA) or PA plus LPS. Increased hepatocellular damage was observed in PA-treated hepatocytes with TPM or CSE treatment, but increased triglyceride level was only observed in PA plus LPS-treated hepatocytes with a high concentration of TPM. Also, expression levels of steatohepatitis-related genes such as TNF-α, NOS 2, and SREBP-1c were significantly increased after treatment of TPM. To further demonstrate the role of Kupffer cells (KCs) after CS extracts treatment, trans-well co-culture system of hepatocytes and KCs was utilized. The levels of inflammatory cytokines and the ratios of Bax/Bcl-2 (apoptosis-related genes) were markedly increased in co-cultured hepatocytes after TPM or CSE treatment. Interestingly, KCs activation was augmented in KCs upon treatment with CSE or TPM. Overall, our findings indicate that <I>in vitro</I> treatment with CSE or TPM differentially contributes to the severity of steatohepatitis by modulating steatohepatitis-related lipotoxicity and inflammation, which might be caused by KCs activation with subsequent induction of hepatocytes apoptosis.</P> <P><B>Highlights</B></P> <P> <UL> <LI> 0.4 mM PA treatment could induce steatohepatitis on primary hepatocytes. </LI> <LI> Increased hepatotoxicity was observed in PA-treated hepatocyte after CS treatment. </LI> <LI> CS treatment enhanced PA-induced inflammation and oxidative stress levels. </LI> <LI> TPM treatment increased PA plus LPS-induced lipotoxicity. </LI> <LI> CS enhanced PA-induced apoptosis of hepatocytes when co-cultured with KCs. </LI> </UL> </P>
Jing Zhou,María C. Latorre 연세대학교 동서문제연구원 2014 Global economic review Vol.43 No.3
A three factor, four region and 15 sector computable general equilibrium (CGE) model is used to study the impact of foreign direct investment (FDI) accruing to China. We focus on the sectors of Electronics, Machinery and Textiles which account for 55.4% and 40% of Chinese overall exports and imports, respectively. Our data confirm the existence of production networks between China and East Asia and the role that the USA and the rest of the world (ROW) play as final markets. Based on these differentiated geographical roles and on the contrasting production technologies, we offer an in-depth analysis for macro- and micro-variables across the four regions.
Zhou, Tong,Hu, Yanbo,Yan, Xuecui,Cui, Jing,Wang, Yibing,Luo, Feng,Yuan, Ye,Yu, Zhenxiang,Zhou, Yifa The Korean Society for Microbiology and Biotechnol 2022 Journal of microbiology and biotechnology Vol.32 No.8
Arabinogalactans have diverse biological properties and can be used as pharmaceutical agents. Most arabinogalactans are composed of β-(1→3)-galactan, so it is particularly important to identify β-1,3-galactanases that can selectively degrade them. In this study, a novel exo-β-1,3-galactanase, named PoGal3, was screened from Penicillium oxalicum sp. 68, and hetero-expressed in P. pastoris GS115 as a soluble protein. PoGal3 belongs to glycoside hydrolase family 43 (GH43) and has a 1,356-bp gene length that encodes 451 amino acids residues. To study the enzymatic properties and substrate selectivity of PoGal3, β-1,3-galactan (AG-P-I) from larch wood arabinogalactan (LWAG) was prepared and characterized by HPLC and NMR. Using AG-P-I as substrate, purified PoGal3 exhibited an optimal pH of 5.0 and temperature of 40℃. We also discovered that Zn<sup>2+</sup> had the strongest promoting effect on enzyme activity, increasing it by 28.6%. Substrate specificity suggests that PoGal3 functions as an exo-β-1,3-galactanase, with its greatest catalytic activity observed on AG-P-I. Hydrolytic products of AG-P-I are mainly composed of galactose and β-1,6-galactobiose. In addition, PoGal3 can catalyze hydrolysis of LWAG to produce galacto-oligomers. PoGal3 is the first enzyme identified as an exo-β-1,3-galactanase that can be used in building glycan blocks of crucial glycoconjugates to assess their biological functions.