Effect of Al on the Microstructure and Mechanical Properties of Mg–Sn–Ca–Mn Wrought Alloy

Yun Feng,Yuanyuan Yang,Zongqi Xiao,Xianglong Meng,Guorong Zhou,Jinfeng Leng,Xinying Teng 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.6

Mg–Sn–Ca–Mn–xAl (x = 0,1.5 wt%) alloys with ultra-fine recrystallized grains were prepared by conventional extrusion(400 °C, 0.5 mm/s). Effects of aluminum (Al) on mechanical properties and microstructure of the Mg–1Sn–1Ca–0.5Mn(wt%) alloy were systematically investigated. By the addition of 1.5 wt% Al, the yield strength of the as-extruded alloysignificantly increased from 183 to 237 MPa. The as-cast alloys show a dendritic structure consists of α-Mg, (Mg, Al)2Ca,and CaMgSn phases. The as-extruded Mg–1Sn–1Ca–0.5Mn–1.5Al alloys exhibit a bimodal grain structure composed ofdynamic recrystallized (DRXed) fine grains and coarse unDRXed grains. Compared with Al free alloy, a lot of nano-scaleplanar Al2Caand rectangle shape Al8Mn5precipitated in the as-extruded alloy with 1.5 wt% Al. Meanwhile, the addition ofAl significantly strengthened alloys’ fiber texture with < 10–10 >//ED.

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.

Association Between Single Nucleotide Polymorphisms in the XRCC1 Gene and Susceptibility to Prostate Cancer in Chinese Men

Zhou, Yun-Feng,Zhang, Guang-Bo,Qu, Ping,Zhou, Jian,Pan, Hui-Xin,Hou, Jian-Quan Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.10

Background: Prostate cancer (Pca) is one of the most common complex and polygenic diseases in men. The X-ray repair complementing group 1 gene (XRCC1) is an important candidate in the pathogenesis of Pca. The purpose of this study was to evaluate the association between single nucleotide polymorphisms in the XRCC1 gene and susceptibility to Pca. Materials and Methods: XRCC1 gene polymorphisms and associations with susceptibility to Pca were investigated in 193 prostate patients and 188 cancer-free Chinese men. Results: The c.910A>G variant in the exon9 of XRCC1 gene could be detected by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) and DNA sequencing methods. Significantly increased susceptibility to prostate cancer was noted in the homozygote comparison (GG versus AA: OR=2.95, 95% CI 1.46-5.42, ${\chi}^2$=12.36, P=0.001), heterozygote comparison (AG versus AA: OR=1.76, 95% CI 1.12-2.51, ${\chi}^2$=4.04, P=0.045), dominant model (GG/AG versus AA: OR=1.93, 95% CI 1.19-2.97, ${\chi}^2$=9.12, P=0.003), recessive model (GG versus AG+AA: OR=2.17, 95% CI 1.33-4.06, ${\chi}^2$=8.86, P=0.003) and with allele contrast (G versus A: OR=1.89, 95% CI 1.56-2.42, ${\chi}^2$=14.67, P<0.000). Conclusions: These findings suggest that the c.910A>G polymorphism of the XRCC1 gene is associated with susceptibility to Pca in Chinese men, the G-allele conferring higher risk.

Feasibility study of improved particle swarm optimization in kriging metamodel based structural model updating

Yun-Lai Zhou,Shiqiang Qin,Jia Hu,Yazhou Zhang,Juntao Kang 국제구조공학회 2019 Structural Engineering and Mechanics, An Int'l Jou Vol.70 No.5

This study proposed an improved particle swarm optimization (IPSO) method ensemble with kriging model for model updating. By introducing genetic algorithm (GA) and grouping strategy together with elite selection into standard particle optimization (PSO), the IPSO is obtained. Kriging metamodel serves for predicting the structural responses to avoid complex computation via finite element model. The combination of IPSO and kriging model shall provide more accurate searching results and obtain global optimal solution for model updating compared with the PSO, Simulate Annealing PSO (SimuAPSO), BreedPSO and PSOGA. A plane truss structure and ASCE Benchmark frame structure are adopted to verify the proposed approach. The results indicated that the hybrid of kriging model and IPSO could serve for model updating effectively and efficiently. The updating results further illustrated that IPSO can provide superior convergent solutions compared with PSO, SimuAPSO, BreedPSO and PSOGA.

HDRE: Coverage Hole Detection with Residual Energy in Wireless Sensor Networks

Yun-zhou Zhang,Xiaohua Zhang,Wenyan Fu,Zeyu Wang,Honglei Liu 한국통신학회 2014 Journal of communications and networks Vol.16 No.5

Coverage completeness is an important indicator forquality of service in wireless sensor networks (WSN). Due to limitedenergy and diverse working conditions, the sensor nodes havedifferent lifetimes which often cause network holes. Most of the existingmethods expose large limitation and one-sidedness becausethey generally consider only one aspect, either coverage rate or energyissue. This paper presents a novel method for coverage holedetection with residual energy in randomly deployed wireless sensornetworks. By calculating the life expectancy of working nodesthrough residual energy, we make a trade-off between network repaircost and energy waste. The working nodes with short lifetimeare screened out according to a proper ratio. After that, the locationsof coverage holes can be determined by calculating the jointcoverage probability and the evaluation criteria. Simulation resultshows that compared to those traditional algorithms without considerationof energy problem, our method can effectively maintainthe coverage quality of repairedWSN while enhancing the life spanof WSN at the same time.

The Double Burden

Yun Zhou 한국사회학회 2018 한국사회학회 심포지움 논문집 Vol.2018 No.5

Optimum study on wind-induced vibration control of high-rise buildings with viscous dampers

Zhou, Yun,Wang, DaYang,Deng, XueSong Techno-Press 2008 Wind and Structures, An International Journal (WAS Vol.11 No.6

In this paper, optimum methods of wind-induced vibration control of high-rise buildings are mainly studied. Two optimum methods, genetic algorithms (GA) method and Rayleigh damping method, are firstly employed and proposed to perform optimum study on wind-induced vibration control, six target functions are presented in GA method based on spectrum analysis. Structural optimum analysis programs are developed based on Matlab software to calculate wind-induced structural responses. A high-rise steel building with 20-storey is adopted and 22 kinds of control plans are employed to perform comparison analysis to validate the feasibility and validity of the optimum methods considered. The results show that the distributions of damping coefficients along structural height for mass proportional damping (MPD) systems and stiffness proportional damping (SPD) systems are entirely opposite. Damping systems of MPD and GAMPD (genetic algorithms and mass proportional damping) have the best performance of reducing structural wind-induced vibration response and are superior to other damping systems. Standard deviations of structural responses are influenced greatly by different target functions and the influence is increasing slightly when higher modes are considered, as shown fully in section 5. Therefore, the influence of higher modes should be considered when strict requirement of wind-induced vibration comfort is needed for some special structures.

Care Issues at the End-of-Life in China

Yun Zhou 서울대학교 사회발전연구소 2016 Journal of Asian Sociology Vol.45 No.2

With changes in population structure, more Chinese live into old or even oldest-old age. Older Chinese, as the elderly in other countries, are more likely to have chronic diseases and die of them. The causes of death and place of death among the elder Chinese have brought up an issue of how to die, or end-of-life care. According to our research, Chinese start to think and talk about death preparation. Living will has become a recent target of promotion among various forces in society, which makes more Chinese understand the concept of living will and gives individuals more choices to decide how they will die. On the part of Chinese society, we have seen a gradual increase in providing hospice care services, a type of end-of-life care. However, comparing with the need of the care and services available, China still has a long way to go to build a better end-of-life care service system for Chinese population.

A Study on the Value-Added Accounting and Management in China

Zhou Yun-lan(주은란),Han Kil-seok(한길석) 한국국제회계학회 2007 국제회계연구 Vol.0 No.17

시장경제상황 아래서의 기업은 이익의 실체이며 기업의 목표와 동기는 이익과 가장 큰 경제적 효익을 추구하는 것이다. 가치 창출은 자본의 자연스러운 현상이며, 부가가치회계와 관리는 기업의 최대의 가치와 경제적 효익을 추구하기 위한 서비스이다. 이것은 미시적 회계와 거시적 회계를 연결하는 다리이며, 기업의 부가가치 전략과 예산설정에 영항을 준다. 이 논문은 중국이 부가가치회계와 관리를 적용하기 위하여 연구되어야 할 부가가치 시트, 현재의 부가가치 회계, 관리를 분석하고, 한국 및 서구에서 이루어지고 있는 부가가치회계부분에서 도입해야할 내용을 중심으로 분석하였다. Under the market economic condition. enterprise is a profit entity, whose goal and motivate is pursuing profit and the biggest economic benefit. In a degree, is pursuing the maximum value-added. While value-added is the natural characteristic of capital. Value-added accounting and management services for enterprise pursuing the maximum value, value-added and economic benefit. It is a bridge of linking macro-accounting with micro-accounting. It is benefit for combing accounting with management; making up for the shortcomings of present accounting and enterprise management system. At the same time. it can affect enterprise’s value-added strategy, plan and budget deeply. This paper argues that china should learn and imitate korea and western country’s value added sheet and execute the first kind of value-added accounting and management presently. On the other hand, in some of the listed company with good operating and management system, introduce the economic value-added accounting and management gradually, pursuing profit and the biggest economic benefit.

Explored a Cryptic Plasmid pSXM33 from Shewanella xiamenensis BC01 and Construction as the Shuttle Vector

Yunli Zhou,I-Son Ng 한국생물공학회 2016 Biotechnology and Bioprocess Engineering Vol.21 No.1

Plasmids are essential tools for gene transfer and manipulation in many kinds of microorganisms, but they remain mysterious in the Shewanella species. Herein, a novel cryptic plasmid pSXM33 was isolated from marine bacterium Shewanella xiamenensis BC01 (SXM) and followed by sequencing and characterization through bioinformatics approaches. At first, the plasmid DNA was digested to relatively short fragments, sub-cloned into vector pMD19T-Simple and pBluescript SK(II), then transformed into Escherichia coli (E. coli) DH5α for sequencing. A full-length pSXM33 nucleotide sequence revealed 8,068 bp with GC content of 44%, containing 12 putative open reading frames (ORFs) and several unique restriction sites. Based on the annotation of sequences, ORF1 and ORF4 showed the highest similarity to the integrase, while ORF3, ORF7 and ORF8 encoded the replication protein RepB, plasmid stabilization protein and CopG family transcriptional regulator, respectively. The promoter prediction and tandem repeats analyses suggested 15 promoters and multiple tandem repeats. Moreover, pETSXM1 and pETSXM2 were successfully constructed as shuttle vectors for E. coli and Shewanella species, based on the repB from pSXM33 and a kanamycin resistance gene from vector pET28a(+) as a selective marker. These results provide a useful genetic tool for new insight into molecular level study of the Shewanella species.