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.

MV-GNN: Multi-View Graph Neural Networks for CTR Prediction

Zhai, P. Y.,Yang, Y. W.,Zhang, C. J. 한국지능정보시스템학회 2022 한국지능정보시스템학회 학술대회논문집 Vol.2022 No.6

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.

Research on the Monitoring and Warning Mechanism about Operation of Funds in Universities of China

Zhai Huayun,Zheng Jun 한국경영교육학회 2011 한국경영교육학회 학술발표대회논문집 Vol.2011 No.12

Based on domestic and international early warning indicator system of funds security of universities, it is established the evaluation indicator system of funds security of universities in China from the micro level and the meso level of social, political and economic environments, and it is established the monitoring and warning mechanism about operation of funds in universities of China. Finally, it is analyzed the status of operation of funds in universities of China.

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.

An electrostatic discharge based needle-to-needle booster for dramatic performance enhancement of triboelectric nanogenerators

Zhai, Cong,Chou, Xiujian,He, Jian,Song, Linlin,Zhang, Zengxing,Wen, Tao,Tian, Zhumei,Chen, Xi,Zhang, Wendong,Niu, Zhichuan,Xue, Chenyang Elsevier 2018 APPLIED ENERGY Vol.231 No.-

<P><B>Abstract</B></P> <P>There is plenty of exploitable energy in the ambient environments. Triboelectric nanogenerator is an innovative electricity generation technology to convert the wasted mechanical energy into electrical energy. However, the output of conventional triboelectric nanogenerators cannot be employed efficiently because their tremendous internal resistance limits the current of electrons. Inspired by the principle of lightning rods, for the first time we propose the utilization of electrostatic discharge to improve the performance of triboelectric nanogenerators, which is realized by an opposite needles structure enclosed in an inert atmosphere. When this structure is connected in series with a vertical contact-separation triboelectric nanogenerator, the strong electric field near tips of two needles ionizes the gas around them, forming a conductive plasma channel between the tips, and releasing a mass of free charges. As a result, some exciting performances are obtained in triboelectric nanogenerator. The output peak-to-peak voltage is increased from 300 V to 1300 V, and the equivalent impedance of energy harvesting circuit is reduced from 100 MΩ to 10 kΩ. Especially in the optimal conditions, the maximum continuous power can even be significantly improved by 330.76%. Therefore, this work provides a new strategy for the energy conversion technology, which is significant for the advancement and application of triboelectric nanogenerators.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A strategy is proposed to improve the performance of triboelectric nanogenerators. </LI> <LI> The maximum continuous power can be boosted dramatically by electrostatic discharge. </LI> <LI> This design reduces the optimal impedance that is important for circuit matching. </LI> <LI> With this design triboelectric nanogenerators can directly drive low-power devices. </LI> <LI> This work is also significant for macro-energy conversion, such as ocean energy. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Model and Heuristics for the Heterogeneous Fixed Fleet Vehicle Routing Problem with Pick-Up and Delivering

Zhai Shuai,Chao Mao 한국유통과학회 2012 한국유통과학회 학술대회 논문집 Vol.2012 No.-

This paper discussed the heterogeneous fixed fleet vehicle routing problem with pick-up and delivery, which different type vehicles have different capacities, fixed costs and travel costs. A more practical mathematical model was established and because the NP-hard, we improved the traditional simulation annealing algorithm and test the new algorithm through a certain scale example. The results show that the new algorithm can obtain better solution, better stability. Through comparing the results of HFFVRP and HFFVRPPD, this paper illustrates the advantages of using HFFVRPPD for physical distribution enterprises in saving distribution vehicles, reducing logistics cost and raising economic benefits.