Synthesis of CdxZn1-xS@MIL-101(Cr) Composite Catalysts for the Photodegradation of Methylene Blue

Shipeng Yang,Siwei Peng,Chunhui Zhang,Xuwen He,Yaqi Cai 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.10

Nanoparticles of the semiconductor catalyst CdxZn1-xS were embedded into the metal organic framework MIL-101(Cr) to obtain CdxZn1-xS@MIL-101(Cr) nanocomposites. These materials not only possess high surface areas and mesopores but also show good utilization of light energy. The ultraviolet-visible diffuse reflectance patterns of CdxZn1-xS@MIL-101(Cr) nanocomposites showed that Cd0.8Zn0.2S@MIL-101(Cr) possessed good visible light response ability among the synthesized nanocomposites. The photocatalytic performance of the CdxZn1-xS@MIL-101(Cr) nanocomposites were tested via degradation and mineralization of methylene blue in neutral water solution under light irradiation using a 300W xenon lamp. As a result, using Cd0.8Zn0.2S@MIL-101(Cr) as a catalyst, 99.2% of methylene blue was mineralized within 30 min. Due to the synergistic effect of adsorption by the MIL-101(Cr) component and photocatalytic degradation provided by the Cd0.8Zn0.2S component, the Cd0.8Zn0.2S@MIL-101(Cr) catalyst displayed superior photocatalytic performance relative to Cd0.8Zn0.2S and MIL-101(Cr). Furthermore, Cd0.8Zn0.2S@MIL-101(Cr) possessed excellent stability during photo-degradation and exhibited good reusability. The remarkable photocatalytic performance of Cd0.8Zn0.2S@MIL-101(Cr) is likely due to the effective transfer of electrons and holes at the heterojunction interfaces.

Analysis of Microbial Communities Responsible for Enhanced Biological Phosphorus Rremoval in an Anaerobic/Aerobic SBR Rreactor using Stable Isotope Probing Approaches

Shipeng Lu,Minjeong Park(박민정),Che Ok Jeon(전체옥) 한국생물공학회 2005 한국생물공학회 학술대회 Vol.2005 No.10

Analysis of Microbial Communities Using Culture-dependent and Culture-independent Approaches in an Anaerobic/Aerobic SBR Reactor

Shipeng Lu,박민정,노현수,이대성,박우준,전체옥 한국미생물학회 2006 The journal of microbiology Vol.44 No.2

Comparative analysis of microbial communities in a sequencing batch reactor whichperformed enhanced biological phosphorus removal (EBPR) was carried out using acultivation-based technique and 16S rRNA gene clone libraries. A standard PCR protocoland a modified PCR protocol with low PCR cycle was applied to the two clone librariesof the 16S rRNA gene sequences obtained from EBPR sludge, respectively, and theresulting 424 clones were analyzed using restriction fragment length polymorphisms(RFLPs) on 16S rRNA gene inserts. Comparison of two clone libraries showed that themodified PCR protocol decreased the incidence of distinct fragment patterns from about63% (137 of 217) in the standard PCR method to about 34% (70 of 207) under themodified protocol, suggesting that just a low level of PCR cycling (5 cycles after 15 cycles)can significantly reduce the formation of chimeric DNA in the final PCR products. Phylogenetic analysis of 81 groups with distinct RFLP patterns that were obtained usingthe modified PCR method revealed that the clones were affiliated with at least 11 phyla orclasses of the domain Bacteria. However, the analyses of 327 colonies, which were groupedinto just 41 distinct types by RFLP analysis, showed that they could be classified into fivemajor bacterial lineages: α, β, γ- Proteobacteria, Actinobacteria, and the phylumBacteroidetes, which indicated that the microbial community yielded from the cultivationbasedmethod was still much simpler than that yielded from the PCR-based molecularmethod. In this study, the discrepancy observed between the communities obtained fromPCR-based and cultivation-based methods seems to result from low culturabilities ofbacteria or PCR bias even though modified culture and PCR methods were used. Therefore, continuous development of PCR protocol and cultivation techniques is needed toreduce this discrepancy.

Mechanical Properties and Microstructure Evolution of Pre-stretched Aluminum Alloy After Induced Electro-Pulsing Treatment

Shipeng Wang,Xiaohui Cui,Ang Xiao,Lei Zhang,Peng Zhao 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.3

In this study, the effect of induced electro-pulsing treatment (IEPT) on the microstructure evolution and correspondingchanges in the mechanical properties of pre-stretched 5052-O aluminum alloy was investigated. Microstructural changesin the alloy were observed using electron backscatter diffraction, transmission electron microscopy, and scanning electronmicroscopy. The application of induced current significantly reduced the yield strength of pre-stretched specimens whilethe elongation increased. In terms of microstructure, more uniformly distributed dimples were observed after induced currentapplication, which indicate the increased plasticity of the alloy. The average grain size and number of low angle grainboundaries increased with application of induced current. The texture types did not change, however, the cube-type texturebecame less pronounced, whereas brass-type and copper-type textures were enhanced. Furthermore, the dislocation densitydecreased and dislocation rearrangement occurred. Thus, IEPT provides a new way to alter the microstructure and mechanicalproperties of the deformed components.

Analysis of DG Influences on System Losses in Distribution Network

Shipeng Du,Qianzhi Shao,Gang Wang 보안공학연구지원센터 2015 International Journal of Grid and Distributed Comp Vol.8 No.5

Characterization and development of EST-SSR markers to study the genetic diversity and populations analysis of Jerusalem artichoke (Helianthus tuberosus L.)

Shipeng Yang,Qiwen Zhong,Jie Tian,Lihui Wang,Mengliang Zhao,Li Li,Xuemei Sun 한국유전학회 2018 Genes & Genomics Vol.40 No.10

In recent years, Jerusalem artichoke has received widespread attention as a novel source of sugar, biofuel, and animal feed. Currently, only few gDNA-SSRs derived from sunflower were verified in the Jerusalem artichoke; therefore, it is particularly important to develop SSR primer markers that belonged to Jerusalem artichoke resources. Using EST data to develop EST-SSR markers is simple and effective. In order to understand the general characteristics of SSR markers in Jerusalem artichoke EST sequences and accelerate the use of SSR markers in Jerusalem artichoke research. This study used 40,370 sequenced unigene fragments and MISA software to identify SSR loci. The 48 pairs of EST-SSR primers assessed for the identification of 45 varieties of Jerusalem artichoke. Cluster, genetic diversity parameters and AMOVA analysis was conducted using the genetic similarity coefficient, revealing genetic differences between 48 genetic material. A total of 1204 SSR loci were identified with 13 different types of repeats, distributed among 1020 EST sequences, of which trinucleotide repeats were the most common, accounting for 38.21% of the total SSR loci. Among the 44 repeat motifs, AG/CT, AAG/ CTT, and ATC/ATG motifs had the highest frequencies, accounting for 22.45, 14.71, and 7.84% of all motifs, respectively. From these sequences, 48 pairs of EST-SSR primers were designed, and 22 primer pairs for loci with high polymorphism were selected to analyze the genetic diversity of 45 Jerusalem artichoke germplasm sources. The results indicated that the variation range of the effective number of alleles for 22 primers ranged between 1.7502 and 4.5660. The Shannon’s information index ranged between 0.6200 and 1.6423. The variation range of PIC ranged between 0.3121 and 0.6662 with an average of 0.5184. Cluster analysis was conducted using the genetic similarity coefficient, revealing significant genetic differences between Asian and European genetic material. Cluster analysis revealed a relationship between the genotypes and geographic origins of the Jerusalem artichoke. The results of AMOVA as well as the genetic identity and genetic distance in the Jerusalem artichoke population showed that there presented certain genetic heterogeneity in Jerusalem artichoke genetic structure of 45 samples from seven different geographic populations. The Jerusalem artichoke EST-SSR marker system established in this study provides an effective molecular marker system for future research focused on Jerusalem artichoke genetic diversity and the breeding of new varieties.

Temperature Dependency of Hydrogen Embrittlement in Thermally H-precharged STS 304 Austenitic Stainless Steel

Shipeng Wang,Xiaohui Cui,Ang Xiao,Peng Zhao,Lei Zhang 대한금속ᆞ재료학회 2023 METALS AND MATERIALS International Vol.29 No.2

In this study, the effect of induced electro-pulsing treatment (IEPT) on the microstructure evolution and correspondingchanges in the mechanical properties of pre-stretched 5052-O aluminum alloy was investigated. Microstructural changesin the alloy were observed using electron backscatter diffraction, transmission electron microscopy, and scanning electronmicroscopy. The application of induced current significantly reduced the yield strength of pre-stretched specimens whilethe elongation increased. In terms of microstructure, more uniformly distributed dimples were observed after induced currentapplication, which indicate the increased plasticity of the alloy. The average grain size and number of low angle grainboundaries increased with application of induced current. The texture types did not change, however, the cube-type texturebecame less pronounced, whereas brass-type and copper-type textures were enhanced. Furthermore, the dislocation densitydecreased and dislocation rearrangement occurred. Thus, IEPT provides a new way to alter the microstructure and mechanicalproperties of the deformed components.

특수체육기관 선택속성과 학부모 만족도 및 지속행동의도의 인과관계: 장애 자녀를 둔 학부모를 대상으로

정세붕 ( Shipeng Ding ),김지태 ( Ji-tae Kim ) 한국특수체육학회 2021 한국특수체육학회지 Vol.29 No.1

이 연구는 학부모의 특수체육기관 선택속성과 학부모만족도 및 지속행동의도의 인과관계를 규명하고, 선택속성과 지속행동의도의 관계에서 학부모 만족도의 매개효과를 규명하는데 목적이 있다. 이를 위해 서울, 경기, 충남지역의 특수체육기관에 자녀를 보내고 있는 학부모를 모집단으로 선정하고 편의표본추출법(convenient sampling method)을 이용하여 450명의 표본을 추출하였다. 이 중 응답자료의 일관성이 결여되거나 결측치가 나타난 24부를 제외한 후 총 426명의 자료를 최종 분석에 사용하였다. 수집한 자료의 통계분석 방법은 SPSS 23.0, AMOS 23.0 통계프로그램을 활용하여 빈도분석, 탐색적 요인분석, 확인적 요인분석, 신뢰도 분석, 상관관계분석, 정규성검증, 구조방정식모형을 적용하였다. 이상의 과정을 통해 도출된 결과는 다음과 같다. 첫째, 선택속성은 학부모만족도에 정(+)적으로 유의한 영향을 미치는 것으로 나타났다. 둘째, 선택속성은 지속행동의도에 정(+)적으로 유의한 영향을 미치는 것으로 나타났다. 셋째, 학부모만족도는 지속행동의도에 정(+)적으로 유의한 영향을 미치는 것으로 나타났다. 넷째, 특수체육기관 선택속성과 지속행동의도의 관계에서 학부모 만족도는 통계적으로 유의한 매개효과가 있는 것으로 나타났다. The purposes of this study were to investigate causal relationship among selection attribute of adapted physical activity institution, parental satisfaction and the intention to continue behavior focusing on parents with disabled children and mediating effect of parental satisfaction in the relationship between the selection attribute and the intention to continue behavior. To achieve these, the parents sending their children to the adapted physical education institutions in Seoul, Gyeonggi, and Chungnam areas were selected as the population to collect the data sample of 450 by using the convenient sampling method. After 24 responses were excluded due to inconsistency or missing data, the total of 426 responses were used for the final analysis. The collected data were processed with the frequency analysis, reliability analysis, correlation analysis, and structural equation modelling by using the SPSS 23.0, AMOS 23.0 statistics program. As a result, the following conclusions were drawn. First, the selection attributes had significant positive effects on the parents’ satisfaction. Second, selection attributes had significant positive effects on the intention to continue behavior. Third, the parents’ satisfaction had significant positive effects on the intention to continue behavior. Fourth, the parents’ satisfaction and class participation had statistically significant mediating effects on the relationship between the selection attributes of the adapted physical education institutions and intention to continue behavior. As a result of the above conclusions, the study would be able to provide basic data and resources to revitalize the adapted physical institutions and to come up with the selection criteria when the parents were choosing such institution.

Measurement of Antioxidant Activities and Phenolic and Flavonoid Contents of the Brown Seaweed Sargassum horneri: Comparison of Supercritical CO₂ and Various Solvent Extractions

Yin, Shipeng,Woo, Hee-Chul,Choi, Jae-Hyung,Park, Yong-Beom,Chun, Byung-Soo The Korean Society of Fisheries and Aquatic Scienc 2015 Fisheries and Aquatic Sciences Vol.18 No.2

Seaweed Sargassum horneri extracts were obtained using supercritical carbon dioxide ($SC-CO_2$) and different solvents. $SC-CO_2$ was kept at a temperature of $45^{\circ}C$ and pressure of 250 bar. The flow rate of $CO_2$ (27 g/min) was constant during the entire 2-h extraction period, and ethanol was used as a cosolvent. Six different solvents [acetone, hexane, methanol, ethanol, acetone mix methanol (7:3), and hexane mix ethanol (9:1)] were used for extraction and agitated by magnetic stirring (250 rpm) in the dark at $25^{\circ}C$ for 20 h; the ratio of material to solvent was 1:10 (w/v). Antioxidant properties of S. horneri extracted using $SC-CO_2$ with ethanol and different solvents have shown good activity. The highest activity belongs to $SC-CO_2$ with ethanol extracted oil, showing DPPH, ABTS, total phenolic content, and total flavonoid levels of $68.38{\pm}1.21%$, $83.51{\pm}1.25%$, $0.64{\pm}0.02mg/g$, and $5.57{\pm}0.05mg/g$, respectively. The S. horneri extracts showed a significant correlation between the antioxidant activity and phenolic content. Based on these results, the $SC-CO_2$ extract (ethanol) of the seaweed extract from brown seaweed may be a valuable antioxidant source.

Characterization of Bioactive Compounds in Brown Seaweed (Sargassum horner) Hydrolyzate using Subcritical Water

Yin Shipeng,Byung-Soo Chun 한국수산과학회 양식분과 2014 한국수산과학회 양식분과 학술대회 Vol.2014 No.7