Effect of Plastic Deformation and Texture on Corrosion of Cold-Rolled AA6061 in NaCl Neutral Solution

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.

Magnetic Interaction in FeCo alloy Nanotube Array

D. Zhou1,T. Wang,M.G. Zhu,Z.H. Guo,W. Li,F. SLi 한국자기학회 2010 한국자기학회 학술연구발표회 논문개요집 Vol.2010 No.12

KINECT기반의 3D 인체 제스처마우스 개발

주강, 서래원 배재대학교 공학연구소 2011 공학논문집 Vol.13 No.1

The development of three-dimensional image processing techniques and endless H/W technology advances more and more three-dimensional imaging is increasing the demand for navigation. 3D navigation of the necessary components as a substitute for real world environment, the creation of virtual reality technology allows them to control, as well as control technology must be accompanied by: This is a system that provides a simple 3D background, but in everyday actions that can control the system refers to the instinctive need to develop interface technology. The purpose of this study of human behavior that is closest to the new 3D navigation and control technologies are in development. In this paper, based on the data of KINECT Mouse Gestures such a core technology for the design is about.

Two groups of S-Layer proteins, SLP1s and SLP2s, in Bacillus thuringiensis co-exist in the S-Layer and in parasporal inclusions

( Zhou Zhou ),( Dong Hai Peng ),( Jin Shui Zheng ),( Gang Guo ),( Long Jun Tian ),( Zi Niu Yu ),( Ming Sun ) 생화학분자생물학회(구 한국생화학분자생물학회) 2011 BMB Reports Vol.44 No.5

We screened four B. thuringiensis strains whose parasporal inclusions contained the S-layer protein (SLP), and cloned two slp genes from each strain. Phylogenetic analysis indicated these SLPs could be divided into two groups, SLP1s and SLP2s. To confirm whether SLPs were present in the S-layer or as a parasporal inclusion, strains CTC and BMB1152 were chosen for further study. Western blots with isolated S-layer proteins from strains CTC and BMB1152 in the vegetative phase showed that SLP1s and SLP2s were constituents of the S-layer. Immunofluorescence utilizing spore-inclusion mixtures of strains CTC and BMB1152 in the sporulation phase showed that SLP1s and SLP2s were also constituents of parasporal inclusions. When heterogeneously expressed in the crystal negative strain BMB171, four SLPs from strains CTC and BMB1152 could also form parasporal inclusions. This temporal and spatial expression is not an occasional phenomenon but ubiquitous in B. thuringiensis strains. [BMB reports 2011; 44(5): 323-328]

Rapid and selective extraction of multiple macrolide antibiotics in foodstuff samples based on magnetic molecularly imprinted polymers

Zhou, Y.,Zhou, T.,Jin, H.,Jing, T.,Song, B.,Zhou, Y.,Mei, S.,Lee, Y.I. Pergamon Press ; Elsevier Science Ltd 2015 Talanta Vol.137 No.-

Magnetic molecularly imprinted polymers (MMIPs) were prepared based on surface molecular imprinting using erythromycin (ERY) as template molecule and Fe<SUB>3</SUB>O<SUB>4</SUB> nanoparticles as support substrate. The MMIPs possessed high adsorption capacity of 94.1mg/g for ERY and the imprinting factor was 11.9 indicating good imprinted effect for ERY. Selective evaluation demonstrated favorable selectivity of MMIPs for multiple macrolide antibiotics (MACs). Using MMIPs as adsorptive material, a rapid and convenient magnetic solid-phase extraction (MSPE) procedure was established for simultaneous and selective separation of six MACs in pork, fish and shrimp samples, then the MACs was subjected to high-performance liquid chromatography-ultraviolet (HPLC-UV) analysis. At different fortified concentrations, the extraction recoveries could reach 89.1% and the relative standard deviations were lower than 12.4%. Chromatogram revealed the response signals of MACs in spiked samples were greatly enhanced and matrix interferences were effectively eliminated after treatment with MSPE. The proposed MSPE procedure coupled with HPLC-UV realized selective and sensitive determination of multiple MACs in foodstuff samples.

Effects of Dietary Supplementation with the Combination of Zeolite and Attapulgite on Growth Performance, Nutrient Digestibility, Secretion of Digestive Enzymes and Intestinal Health in Broiler Chickens

Zhou, P.,Tan, Y.Q.,Zhang, L.,Zhou, Y.M.,Gao, F.,Zhou, G.H. Asian Australasian Association of Animal Productio 2014 Animal Bioscience Vol.27 No.9

This study was designed to investigate the effects of basal diets supplemented with a clay product consisting of zeolite and attapulgite (ZA) at 1:1 ratio on growth performance, digestibility of feed nutrients, activities of digestive enzymes in small intestine and intestinal health in broiler chickens. In experiment 1, 112 one-day-old male chickens were randomly divided into 2 groups with 8 replicates of 7 chickens each. In experiment 2, 84 one-day-old male chickens were randomly allocated into 2 groups consisting 6 replicates of 7 chickens each. The experimental diets both consisted of a maize-soybean basal control diet supplemented with 0% or 2% ZA. The diets were fed from 1 to 42 days of age. The results showed that ZA supplementation could increase body weight gain (BWG) and feed intake (FI), but had no significant effect on feed conversion ratio. The apparent digestibility values of crude protein and gross energy were significantly increased (p<0.05) by ZA from 14 to 16 d and 35 to 37 d. Dietary ZA treatment significantly increased (p<0.05) the activities of amylase, lipase and trypsin in jejunal digesta and the activities of maltase and sucrase in jejunal mucosa on days 21 and 42. The ZA supplementation also significantly increased (p<0.05) the catalase activity, reduced (p<0.05) the malondialdehyde concentration in the jejunal mucosa. In addition, a decrease of serum diamine oxidase activity and an increase (p<0.05) in concentration of secretory immunoglobulin A in jejunal mucosa were observed in birds treated with ZA on 21 and 42 days. It is concluded that ZA supplementation (2%) could partially improve the growth performance by increasing BWG and FI. This improvement was achieved through increasing the secretion of digestive enzymes, enhancing the digestibilites of nutrients, promoting intestinal health of broiler chickens.

Effect of fermented blueberry on the oxidative stability and volatile molecule profiles of emulsion-type sausage during refrigerated storage

Zhou, Hengyue,Zhuang, Xinbo,Zhou, Changyu,Ding, Daming,Li, Chunbao,Bai, Yun,Zhou, Guanghong Asian Australasian Association of Animal Productio 2020 Animal Bioscience Vol.33 No.5

Objective: The aim of this work was to assess the effect of fermented blueberry (FB; 2%, 4%, and 6%) on the oxidative stability and volatile molecule profiles of emulsion-type sausage stored at 4℃ for 28 days. Methods: The antioxidant activity of FB was determined through radical-scavenging activity against 2, 2-diphenyl-1-picrylhydrazyl (DPPH) and hydroxyl radicals. Four formulations of sausage treatments with different FB levels (0%, 2%, 4%, 6%) were prepared, then peroxide value (POVs), thiobarbituric acid-reactive substances (TBARS) values, protein carbonyls and thiol groups were measured. The aroma profiles of sausages for each treatment was also determined. Results: The half maximal inhibitory concentration indicated that FB had greater scavenging ability than ascorbic acid against DPPH and hydroxyl radicals. Sausages with FB significantly retarded increases in POVs and TBARS, as well as in the content of protein carbonyls during all storage days (p<0.05). Particularly, 4% and 6% FB-treated sausages had better oxidation inhibition effects. However, FB accelerated the reduction in thiol groups (p<0.05). Additionally, FB inhibits the excessive formation of aldehyde compounds; for example, hexanal, which may cause rancid flavors, decreased from 58.25% to 19.41%. FB also created 6 alcohols (i.e., 2-methyl-1-propanol, 3-methyl-1-butanol, and phenylethyl alcohol), 5 ester compounds (i.e., ethyl acetate, ethyl lactate, and ethyl hexanoate) and 3-hydroxy-2-butanone in the sausages that contribute to sausage flavors. The principal component analysis showed that the aroma profiles of sausages with and without FB are easily identified. Conclusion: The addition of FB could significantly reduce the lipid and protein oxidation and improve oxidative stability for storage. Also, adding FB could inhibit rancid flavors and contribute to sausage flavors.

BINDING NUMBERS AND FRACTIONAL (g, f, n)-CRITICAL GRAPHS

ZHOU, SIZHONG,SUN, ZHIREN The Korean Society for Computational and Applied M 2016 Journal of applied mathematics & informatics Vol.34 No.5

Let G be a graph, and let g, f be two nonnegative integer-valued functions defined on V (G) with g(x) ≤ f(x) for each x ∈ V (G). A graph G is called a fractional (g, f, n)-critical graph if after deleting any n vertices of G the remaining graph of G admits a fractional (g, f)-factor. In this paper, we obtain a binding number condition for a graph to be a fractional (g, f, n)-critical graph, which is an extension of Zhou and Shen's previous result (S. Zhou, Q. Shen, On fractional (f, n)-critical graphs, Inform. Process. Lett. 109(2009)811-815). Furthermore, it is shown that the lower bound on the binding number condition is sharp.

교육의 기회균등 관점에서의 중국 소수민족 대학입시제도 우대정책 발전방안

Zhou, Mimi(Zhou, Mimi),전춘련(Quan, ChunLian) 학습자중심교과교육학회 2017 학습자중심교과교육연구 Vol.17 No.23

중국은 다민족국가라는 특수성 때문에 정부는 소수민족이 사회에 적응하고 조화로운 사회통합을 이룰 수 있는 다양한 우대정책을 시행하고 있는데 그 중 하나가 소수민족 대학입시 우대정책이다. 현재 중국정부는 경제가 낙후한 지역의 소수민족에게 대학입시 가산점부여, 입학조건 완화 등 대학입시 우대정책을 시행하고 있지만, 정책의 신뢰성 및 선발과정에서의 공정성 등 아직도 해결해야 할 문제들이 남아 있다. 때문에 이 연구에서는 어떻게 하면 우대정책이 정책수요자의 입장에서 신뢰를 받을 수 있을지, 어떠한 방법으로 수혜대상자에게 기회균등을 보장할 수 있을지에 대한 방안을 찾기 위해서, 현재 시행하고 있는 소수민족 대학입시 우대정책을 교육 평등 및 교육기회균등의 관점에서 문제점을 분석하였고, 이러한 문제점을 보완할 수 있는 소수민족 대학입시 교육관련 법률 제정, 소수민족 교육전반에 걸친 우대정책 제정의 필요성을 제기하고, 소수민족 지역특징에 맞는 차별화된 우대정책 구축, 교육기회균등을 위한 중앙정부의 감독ㆍ관리시스템 구축을 제안하고 있다. With the special situation of China as it is a multi-ethnic state, the government has implement various preferential policies for minority races to adapt to the society and establish harmonious social integration and one of such policies would be the affirmative action in the university entrance system. Currently, the Chinese government implements the affirmative action in the university entrance system, such as granting of additional score for the university entrance, moderation of entrance requirements and so forth, for the minority races in the economically deteriorated regions, but there are issues of reliability for the policy, fairness in screening process and so forth that there are issues yet to be solved. If so, in order to find out the clues on how to obtain the reliability on the preferential policy as in the position of the policy users and how the equal opportunity is guaranteed to the beneficiaries under the affirmative action in the university entrance system for the minority races after analyzing the policy with the point of view of education equality and equal opportunity in education, and then, it presents the need to enact laws related to the university entrance education for minority races, and establish the preferential policy through overall education of minority races to supplement the foregoing issues. And it proposes to structure the differentiated preferential policies as appropriate to the local characteristics of minority races and structure the supervisory and management system of the central government for equal opportunity in education.

A novel ceramic GEM used for neutron detection

Zhou, Jianrong,Zhou, Xiaojuan,Zhou, Jianjin,Jiang, Xingfen,Yang, Jianqing,Zhu, Lin,Yang, Wenqin,Yang, Tao,Xu, Hong,Xia, Yuanguang,Yang, Gui-an,Xie, Yuguang,Huang, Chaoqiang,Hu, Bitao,Sun, Zhijia,Chen, Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.6

A novel ceramic Gas Electron Multiplier (GEM) has been developed to meet the demand of high counting rate for the neutron detection which is an alternative to ³He-based detector at China Spallation Neutron Source (CSNS). An experiment was performed to measure the neutron transmittance of ceramic-GEM and FR4-GEM at the small angle neutron scattering (SANS) instrument. The result showed the ceramic-GEM has higher transmittance and less self-scattering especially for cold neutrons. One single ceramic GEM could give a gain of 10²-10⁴ in the mixture gas of Ar and CO₂ (90%:10%) and its energy resolution was about 27.7% by using ⁵⁵Fe X ray of 5.9 keV. A prototype has been developed in order to investigate the performances of the ceramic GEM-based neutron detector. Several neutron beam tests, including detection efficiency, spatial resolution, two-dimensional imaging, and wavelength spectrum, were carried out at CSNS and China Mianyang Research Reactor (CMRR). The results show that the ceramic GEM-based neutron detector is a good candidate to measure the high intensity neutrons.