Steam-Chest Molding of Expanded Polypropylene Foams. 2. Mechanism of Interbead Bonding

Zhai, Wentao,Kim, Young-Wook,Jung, Dong Won,Park, Chul B. American Chemical Society 2011 INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH - Vol.50 No.9

<P>Expanded polypropylene (EPP) bead foams were processed using steam-chest molding. Interbead bonds formed during processing and was characterized by observing both the product surface and the fracture surfaces using scanning electron microscopy (SEM) and by measuring the tensile properties of specimens. It was found that both the degree of interbead bonding and the tensile strength had a direct relationship to the steam pressure/temperature and that high steam temperature enhanced the crystallization behavior of EPP beads during the cooling process. A formation mechanism of interbead bonding during processing was proposed based on the crystal melting behaviors, as discussed in the first article of this series (<name name-style='western'>Zhai</name> et al. Ind. Eng. Chem. Res.<x xml:space='preserve'> </x>2010<x xml:space='preserve'>, </x>49<x xml:space='preserve'>, </x>9822). Possible parameters influencing the formation of interbead bonding, namely, steam temperature/pressure and bead foam expansion ratio, were investigated in this study. The effect of postannealing of the EPP products on the shrinkage and crystallinity of the molded EPP products was also addressed.</P>

One-pot synthesis of hybrid mesoporous xerogels starting with linear polymethylhydrosiloxane and bridged bis-(trimethoxysilyl)ethane

Zhai, Shang-Ru,Song, Yu,Zhai, Bin,An, Qing-Da,Ha, Chang-Sik Elsevier 2012 Microporous and mesoporous materials Vol.163 No.-

Genetic and antigenic characterization of fragments of the pheasant immunoglobulin Y heavy chain constant region

Jing Zhai,Weishan Chang,Zhenzhen Zhai,Xingliang Ma,Lingling Yang,Jinfeng Ti,Daozhen Song,Shijun Fu,Dapeng Li 한국유전학회 2016 Genes & Genomics Vol.38 No.8

Few studies have attempted to characterize the pheasant (Phasianus colchicus) immunoglobulin Y (IgY) heavy chain constant region. In the present study, fragments of the pheasant IgY heavy chain constant region were cloned, analyzed, and expressed. The cross-reactivity of IgY or immunoglobulin G (IgG)s with antigens from other vertebrate species was determined using dot-enzymelinked immunosorbent assay and western blot analysis. Five peptides of the pheasant IgY heavy chain constant region were synthesized to determine its immunoregulatory activity in vitro. The IgY heavy chain constant region from pheasant showed the highest homology with that from chicken (71.2 %) and duck (49.1 %). Phylogenetic analysis for IgY showed that pheasant was closely related to chicken and duck than to any other analyzed vertebrate species. The rabbit anti-chicken IgG showed immunologic cross-reactivity with recombinant proteins of the pheasant IgY heavy chain constant region. Four peptides were able to induce significant up-regulation of interleukin (IL)-1b, IL-4, and interferon-c in chicken peripheral blood lymphocytes, suggesting a new role of avian IgY in immune regulation.

Analysis of Active Components and Proteomics of Chinese Wild Rice (Zizania latifolia (Griseb) Turcz) and Indica Rice (Nagina22)

Ming-xia Jiang,Li-jie Zhai,Hua Yang,Shu-menghui Zhai,Cheng-kai Zhai 한국식품영양과학회 2016 Journal of medicinal food Vol.19 No.8

The ancient Chinese wild rice (Zizania latifolia (Griseb) Turcz) (CWR) has valuable biological and medicinal functions. To assess the advantages lost in modern cultivated rice after domestication, we compared the composition of bioactive compounds and the results of proteomic analysis with those of Indica rice (N22). We used routine methods to determine the protein, total dietary fiber, amino acid, mineral substance, plant secondary metabolites, and amino acid composition of CWR and N22. The protein and mineral contents of CWR were two times that of N22, and the levels of calcium, potassium, magnesium, chromium, iron, and zinc were significantly higher than those of N22 (P < .05). There was ~7.6 times more dietary fiber in CWR than in N22, but fewer carbohydrates (P < .05). Anthocyanins and chlorophyll were detected in CWR, but were absent from N22. Compared with N22, CWR had 53, 19, and 5.4 times higher (P < .05) levels of saponins, flavonoids, and plant sterols, respectively. The amino acid score of CWR was 66.6, which was significantly higher than N22. Sodium dodecyl sulfate–polyacrylamide gel electrophoresis (SDS-PAGE) indicated that the main seed proteins of CWR were glutelins, including both acid and alkaline subunits, which were approximately twice those of N22. To investigate the differences in protein profiles between CWR and N22, we conducted two-dimensional electrophoresis (2-DE) analysis of the total proteins in the seeds of the two rice species. 2-DE gels revealed 19 differentially expressed proteins. Information obtained from peptide mass fingerprinting indicates that glutelin precursor caffeoyl coenzyme A (CoA) O-methyltransferase and putative bithoraxoid-like protein can provide good gene sources for improving rice quality.

MicroRNA-206 Protects against Myocardial Ischaemia-Reperfusion Injury in Rats by Targeting Gadd45β

Zhai, Changlin,Qian, Qang,Tang, Guanmin,Han, Bingjiang,Hu, Huilin,Yin, Dong,Pan, Haihua,Zhang, Song Korean Society for Molecular and Cellular Biology 2017 Molecules and cells Vol.40 No.12

MicroRNAs are widely involved in the pathogenesis of cardiovascular diseases through regulating gene expression via translational inhibition or degradation of their target mRNAs. Recent studies have indicated a critical role of microRNA-206 in myocardial ischaemia-reperfusion (I/R) injury. However, the function of miR-206 in myocardial I/R injury is currently unclear. The present study was aimed to identify the specific role of miR-206 in myocardial I/R injury and explore the underlying molecular mechanism. Our results revealed that the expression level of miR-206 was significantly decreased both in rat I/R group and H9c2 cells subjected to hypoxia/reoxygenation (H/R) compared with the corresponding control. Overexpression of miR-206 observably decreased infarct size and inhibited the cardiomyocyte apoptosis induced by I/R injury. Furthermore, bioinformatics analysis, luciferase activity and western blot assay proved that $Gadd45{\beta}$ (growth arrest DNA damage-inducible gene $45{\beta}$) was a direct target gene of miR-206. In addition, the expression of pro-apoptotic-related genes, such as p53, Bax and cleaved caspase3, was decreased in association with the down-regulation of $Gadd45{\beta}$. In summary, this study demonstrates that miR-206 could protect against myocardial I/R injury by targeting $Gadd45{\beta}$.

Ti-based electrode materials for electrochemical sodium ion storage and removal

Zhai, Haifa,Xia, Bao Yu,Park, Ho Seok The Royal Society of Chemistry 2019 Journal of Materials Chemistry A Vol.7 No.39

<P>Owing to the natural abundance and high safety, electrochemical sodium-ion storage and removal devices are considered as promising candidates for large-scale energy storage and water purification systems. When used as the key component of sodium ion batteries (SIBs), sodium ion hybrid capacitors (SIHCs), and capacitive deionization (CDI) devices, the electrode architecture and composition need to be precisely designed to achieve high capacity, rate performance, and long life span. Among various sodium hosting materials, titanium-based electrodes have been intensively investigated owing to their appropriate operating voltage, small strain expansion, fast rate capability, environmental friendliness, safety, and low costs. In this review, we discuss the progress of Ti-based electrode materials over the last two years, covering their classification and key factors (electrical conductivity, ion diffusion, volume variation, capacity and operating voltage) of the electrode design for SIB, SIHC, and CDI applications. The architectural concepts, synthesis methods, and microstructural and compositional control of Ti-based electrodes are also discussed. Our perspectives on current impediments and the future research direction are finally discussed. This review inspires us to propose new chemical strategies that can greatly improve the electrochemical performance.</P>

The Influence of Job Crafting on Creative Performance: Focused on the Mediating Effect of Psychological Empowerment and the Moderating Effect of Affective Commitment

Zhai, peipei(적패패),Chung, Soo-Jin(정수진) 한국경영교육학회 2019 경영교육연구 Vol.34 No.4

[연구목적] 본 연구의 목적은 잡 크래프팅이 직원들의 창조적인 성과와의 관계에 대해 알아보았으며, 심리적 임파워먼트의 매개효과 검증 및 정서적 몰입의 조절효과 검증을 실시하였다. [연구방법] 본 연구는 중국내 모 기업에서 직원들을 대상으로 데이터를 수집하였으며, SPSS, AMOS 및 Process Modeling을 사용하여 본 연구에서 제시한 총 4개의 가설을 분석하였다. [연구결과] 가설검증 결과 잡 크래프팅은 직원의 창조적 성과와 정(+)의 관계에 있는 것으로 나왔으며 심리적 임파워먼트는 잡크래프팅과 창조적 성과 사이에서 매개효과가 있는 것으로 밝혀졌다. 또한 정서적 몰입과 잡 크래프팅과의 상호작용 효과는 심리적 임파워먼트와 정(+)의 관계에 있는 것으로 나타났다. [연구의 시사점] 경영자들은 기업의 창조적 성과 향상이라는 목표를 달성하기 위해 직원들의 심리적 임파워먼트와 정서적 몰입을 육성하고 개선하기 위해 노력하면서 직원들의 주요 역할을 스스로 발휘할 수 있도록 노력해야 한다. [Purpose] This study aims to verify the effect of job crafting on creative performance, the mediating effect of psychological empowerment and the moderating effect of affective commitment. [Methodology] Base on theoretical research, this study puts forward 4 key research hypotheses and established a research model. Data were collected from employees in China by the survey method and SPSS & AMOS programs were used to test the hypotheses of the research model. [Findings] Job crafting is positively related to creative performance. Psychological empowerment as the mediating variable and affective commitment as the moderating variable effect job crafting and creative performance. [Implications] Managers should give full play to the principal role of employees, striving to cultivate and improve employees’ psychological empowerment and affective commitment, so as to achieve the goal of improving enterprise creative performance.

한국어 실력이 왕초보인 박사과정 유학생의 학업적응에 관한 내러티브 탐구

ZHAI LIXIA,박창언,Chen Dan 한국내러티브교육학회 2018 내러티브와 교육연구 Vol.6 No.3

The purpose of this study is to investigate the narrative of academic adaptation of Korean Zero-based International Doctoral Students. Through the analysis of the data which were collected by in-depth interviews and Internet communication to understand the status of the sub-factors such as learning motivation, learning behavior, school facility utilization and school program participation, personal stress, and satisfaction with academic achievement of Academic Adaptation. As a result, we can know the participants have less personal economic stress and have satisfaction with academic achievement. But they have some problems about the other sub-factors. In order to solve this problems and help them to adapt their academic adaptation well, we offer some suggestions for individual, school, and government. 본 연구는 한국어 실력이 왕초보인 박사과정 유학생의 학업적응에 대한 내러티브 탐구이다. 심층 인터뷰와 인터넷 통신의 방식으로 자료를 수집하여 학습동기, 학습행동, 학교 시설이용도 및 학교 프로그램의 참여도, 개인적 스트레스, 학업성취도에 대한 만족도 등 하위 요인의 측면에서 학업적응의 현황을 분석하였다. 연구를 통해서 참여자들은 개인적인 경제 스트레스가 크지 않고 학업성취도에 대한 만족도가 높은 것으로 나타나는 반면, 다른 하위 요인 때문에 다소간의 어려움을 겪고 있는 것으로 나타났다. 이런 어려움을 해결하고 더 질 높은 적응을 기대하며, 개인, 학교, 정보 등 3가지의 측면에서 제안하였다.

An Integrated Simulation Method to Support Virtual Factory Engineering

Zhai, Wenbin,Fan, Xiumin,Yan, Juanqi,Zhu, Pengsheng Society for Computational Design and Engineering 2002 International Journal of CAD/CAM Vol.2 No.1

This paper presents a structure and architecture of an integrated simulation method (ISM) to meet the requirements of virtual factory engineering (VFE). Combining CAD, VR and discrete event simulation techniques, the ISM provides static and dynamic simulation functions for implementation of VFE throughout the lifecycle. The static simulation can be used to evaluate the factory layout. The dynamic simulation enables us to evaluate ergonomics of factory, process performance of production system, feasibility of production plan and operation of factory, and to train operators safely, which cover the whole VFE lifecycle. The principles of the key techniques of VFE, including virtual factory data management system (VFDMS), static and dynamic simulation, are also discussed. To demonstrate and validate the ISM, a case study has been carried out in an assembly factory.

The Current Status, Trend, and Influencing Factors to Malnutrition of Infants and Children in China

Zhai, Feng-Ying,Wang, Hui-Jun,Chang, Su-Ying,Fu, Dawei,Ge, Keyou,Popkin, Barry M. The Korean Society of Community Nutrition 2004 Journal of community nutrition Vol.6 No.2

Children are the most nutrition sensitive sub-group of a population. The nutritional status of children should be especially emphasized at all levels. This study was performed to investigate the current status, trend, and influencing factors to malnutrition of infants and children in China. The study was mainly based on the China Health and Nutrition Survey which is a longitudinal study conducted in 8 provinces and the data on growth of children under 7 years of age in 9 cities in China. The result of this study showed that one fifth of the children under 5 years of age are still suffering from stunted growth and one tenth suffering from underweight. The nutrition intervention on children under 2 years of age, especially on those under 18 months should be emphasized. Better supplementary food can improve the nutritional status to decrease the prevalence of stunted children. Therefore, the development of supplementary food should be the priority and should be emphasized with breastfeeding.