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Assessment of the Magnetocaloric Effect upon the Magnetic Entropy Change
Ying De Zhang,Tien Van Manh,The Long Phan,박홍렬,유성초 한국물리학회 2021 New Physics: Sae Mulli Vol.71 No.4
The magnetocaloric effect is a dynamic phenomenon associated with a temperature change of a magnetic material when it is subjected to a magnetic-field change. The effect can be assessed through the adiabatic temperature change (ΔTad) or the isothermal magnetic-entropy change (ΔSm). This work reviews some typical methods that are usually used to calculate ΔSm for perovskite-type manganites. These methods was thermodynamic relations and different theoretical models to analyze magnetization isotherms, M(H) data, recorded at temperatures around the ferromagnetic-paramagnetic phase transition (TC), Together with showing the methods for calculating of ΔSm, we also take into account the figures of merit of a MC material.
Jun Zhang,De-Song Tang,Shu-Ying Gong,Ying-Bin Zhang,Ping Chen,Zhi-Lei Gu 한국차학회 2015 한국차학회지 Vol.- No.S
The relationships among the concentrations of chemical compositions, scores of sensory quality and price were studied based on 112 jasmine tea samples. Linear correlation analysis showed that 5 quality attributes (appearance, liquor color, aroma, taste and infused leaves) were positively correlated with each other and to the sum. 5 quality attributes and total quality score were logarithm relevant to price with the coefficients of determination R2 were 0.855, 0.667, 0.836, 0.900, 0.906 and 0.914. The six taste attributes could be grossly divided into two groups. Tenderness, sweetness, freshness and mellowness were grouped showing positive correlation with taste score, total quality score and price, while heaviness and thickness were grouped for opposite correlation. There were positive correlation within the same group and negative correlation between two different groups. The concentrations of polyphenols, amino acid, water extract, gallocatechin (GC), epigallocatechin (EGC), catechin (C), epicatechin (EC), epigallocatechin gallate (EGCG), gallocatechin gallate (GCG) and epicatechin gallate (ECG) in tea infusions were negatively correlated with tenderness, sweetness, freshness, mellowness, taste score, total quality score and price but positively correlated with heaviness and thickness (except some individual components), while gallic acid (GA) was the opposite. Multiple linear regression equations of taste score and total quality score were established. The back substitution was of high correlation between predicted and actual value and acceptance rate was over 90%. The relationships among the concentrations of chemical compositions, scores of sensory quality and price were studied based on 112 jasmine tea samples. Linear correlation analysis showed that 5 quality attributes (appearance, liquor color, aroma, taste and infused leaves) were positively correlated with each other and to the sum. 5 quality attributes and total quality score were logarithm relevant to price with the coefficients of determination R2 were 0.855, 0.667, 0.836, 0.900, 0.906 and 0.914. The six taste attributes could be grossly divided into two groups. Tenderness, sweetness, freshness and mellowness were grouped showing positive correlation with taste score, total quality score and price, while heaviness and thickness were grouped for opposite correlation. There were positive correlation within the same group and negative correlation between two different groups. The concentrations of polyphenols, amino acid, water extract, gallocatechin (GC), epigallocatechin (EGC), catechin (C), epicatechin (EC), epigallocatechin gallate (EGCG), gallocatechin gallate (GCG) and epicatechin gallate (ECG) in tea infusions were negatively correlated with tenderness, sweetness, freshness, mellowness, taste score, total quality score and price but positively correlated with heaviness and thickness (except some individual components), while gallic acid (GA) was the opposite. Multiple linear regression equations of taste score and total quality score were established. The back substitution was of high correlation between predicted and actual value and acceptance rate was over 90%.
Ying Zhi Gao,Shi Ping Wang,De Li Wang,Jie Zhang,Huai Yu Wan 한국초지조사료학회 2009 한국초지조사료학회 학술대회논문집 Vol.2009 No.08
To explore the relationship of species diversity and aboveground productivity in grazing ecosystem is very important to manage grassland. We used the four years' data to check this relationship and to look how abiotic factor affect species diversity and aboveground productivity. We found a good linear relationship between species diversity and aboveground productivity in all previous grazing sites, while no any relationship was found in the no grazing site. From our results, we concluded that drought affects aboveground productivity more than grazing, while heavy grazing affects species diversity more than drought in Inner Mongolian steppe.
Effects of Ca2+ ion substitution on the structure and magnetism of SrRuO3: Elusive magnetism
Zhang Wen-Ying,Yue Cai-Xia,Zhao De-Wei,Li Guo-Ke,Ma Li,Zhen Cong-Mian,Hou Deng-Lu 한국물리학회 2020 Current Applied Physics Vol.20 No.12
SrRuO3 is an orthogonally distorted perovskite (Pbnm) structure whose ferromagnetism is often viewed as an itinerant ferromagnet. Although SrRuO3 has been studied for more than half a century, its structure, magnetism and transport properties are still poorly understood. In this paper, the structure and magnetic evolution of SrRuO3 are discussed in depth through the substitution of Ca2+ for Sr2+ at A sites. The results show that as the Ca substitution increases, the lattice constant decreases, the orthogonal distortion becomes larger, and the saturation magnetization MS, Curie temperature TC and Weiss temperature θp decrease accordingly. Eventually, the ferromagnetic SrRuO3 changes to paramagnetic CaRuO3. The critical exponent β of samples with different substitution contents was obtained by fitting the experimental results, and the value for SrRuO3 (β = 0.55) was similar to that obtained by mean field theory. However, the value increases with the substitution x of Ca, which can’t be explained by any scaling theory. The results show that the increase in the value of β is related to the magnetic disorder caused by different magnetic interactions. Analysis using the Rhodes-Wohlfarth criterion indicates that Sr1-xCaxRuO3 has both itinerant-electron and localized-electron magnetism, which is consistent with the theoretical predictions.
Ying Zhi Gao,Shi Ping Wang,You Neng Yang,De Li Wang,Jie Zhang 한국초지조사료학회 2009 한국초지조사료학회 학술대회논문집 Vol.2009 No.08
Grazing restoration succession of the degraded grassland is an important aspect in community ecology. Field experiment was carried out to examine how major species restore in first four years restoration following 11 consecutive grazing under different stocking rates in Inner Mongolian steppe. A. frigida and P. acaulis are the most important two species in the all treatments (NG, LG, MG and HG) after four years restoration, although they had high fluctuation. The biomasses of these two species account for 40-90% of total biomass. Especially in no grazing area, which was exclosured since 1990, A. frigida and P. acaulis are still the most important two species in the community. These results suggested A. frigida and P. acaulis conununity are quite stable, and will keep long-time if no special measurements were taken during the restoration of the degraded grassland.
NANOTOXICITY OF MULTIWALL CARBON NANOTUBES TO A549 CELLS IN VITRO
FU-DE WANG,Ying Tang,Yong Ji Yang,CHAN JIN,HUA ZHANG,HAO LIANG 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.2
Multiwall carbon nanotubes (MWCNTs) have been widely applied in many ¯elds due to theexcellent physical and chemical properties. As the production and applications of nanotubesexpand, public concern about their potential risks to human health has also raised. Cytotoxicityof MWCNTs was evaluated in this study using a cultured human epithelial cell line A549. Uptakeof MWCNTs by cultured A549 cells was observed by TEM imaging. Dose-dependent decrease ofcell viability showed the cytotoxicity of MWCNTs. Signi¯cant reactive oxygen species (ROS)generation and GSH depletion which reduced the cellular antioxidant level could be the majorfactor of cytotoxicity induced by MWCNTs. MWCNTs seemed to trigger the activation of cellautophagy with the intracellular ATG16L1 level increase as a defense mechanism.
( Yan Zhang ),( De Ying Zhang ),( Yan Fang Zhao ),( Jin Wang ),( Juan Wen He ),( Jin Yong Luo ) 생화학분자생물학회(구 한국생화학분자생물학회) 2013 BMB Reports Vol.46 No.2
Although BMP6 is highly capable of inducing osteogenic differentiation of mesenchymal progenitor cells (MPCs), the molecular mechanism involved remains to be fully elucidated. Using dominant negative (dn) mutant form of type I and type II TGFβ receptors, we demonstrated that three dn-type I receptors (dnALK2, dnALK3, dnALK6), and three dn-type II receptors (dnBMPRII, dnActRII, dnActRIIB), effectively diminished BMP6- induced osteogenic differentiation of MPCs. These findings suggested that ALK2, ALK3, ALK6, BMPRII, ActRII and ActRIIB are essential for BMP6-induced osteogenic differentiation of MPCs. However, MPCs in this study do not express ActRIIB. Moreover, RNA interference of ALK2, ALK3, ALK6, BMPRII and ActRII inhibited BMP6-induced osteogenic differentiation in MPCs. Our results strongly suggested that BMP6-induced osteogenic differentiation of MPCs is mediated by its functional TGFβ receptors including ALK2, ALK3, ALK6, BMPRII, and ActRII. [BMB Reports 2013; 46(2): 107-112].
Yan-Ying Tan,Guang-Yao Zhu,Rui-Fang Ye,Hong-Zhou Zhang,De-Yu Zhu 한국생물공학회 2021 Biotechnology and Bioprocess Engineering Vol.26 No.6
Demeclocycline (DMCTC), a tetracycline derivative antibiotic produced by Streptomyces aureofaciens, has attracted attention owing to its high bioavailability, prolonged maintenance of a therapeutic concentration, and greater efficacy against many infectious microorganisms. However, the productivity of the DMCTC-producing strains has remained low. Thus, it is necessary to identify gene-knockout or amplification targets to increase DMCTC production. Here, we demonstrated that ctcB, which encodes a Streptomyces antibiotic regulatory protein (SARP), and ctcC, which encodes a resistance gene, positively regulate the biosynthesis of DMCTC in S. aureofaciens strain DT1. In particular, overexpression of the ctcB gene in S. aureofaciens DT1 significantly enhanced DMCTC production, resulting in increased expression of ctcG, ctcN, ctcQ, ctcH, ctcV, and ctcC. The deletion of ctcB dramatically reduced the DMCTC level, implying that CtcB is an activator of DMCTC biosynthesis. Although overexpression of the ctcC, which encodes a ribosomal protection protein, enhancing DMCTC biosynthesis in S. aureofaciens DT1, the improvement was limited compared with that achieved by ctcB overexpression. This is the first study to identify the role of ctcB and ctcC in DMCTC accumulation; these genes may also be ideal candidate targets for facilitating DMCTC production by other Streptomyces strains.