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Optical Properties Related to Two-Dimensional Electron Gas at AlGaN/GaN Heterostructures
Young Shin Park,Chang Mo Park,D. J. Fu,Ho Sang Lee,Hong Jin Kim,J. E. Oh,Jong Ho Na,Sung Woo Choi,T. W. Kang 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.43 No.51
We report photoluminescence (PL) spectra related to a two-dimensional electron gas (2DEG) conned at an AlGaN/GaN heterointerface. The 2DEG related the PL has been identied by measuring PL of the structure as functions of the light intensity and the temperature and by comparing the results with those obtained for GaN exposed via etching. The PL peak related to recombination between the two-dimensional electron gas and photoexcited holes is located at 3.436 eV at 15 K, which is 28 meV below the bound exciton (D0X) emission in GaN. The activation energy is about 10.8 meV.
China Spallation Neutron Source: Accelerator Design Iterations and R&D Status
J. Wei,C.-D. Deng,C.-H. Wang,C.-T. Shi,H. Sun,H.-F. Ouyang,H.-M. Qu,H.-Y. Dong,J. Li,J. Zhang,J.-S. Cao,J.-Y. Tang,L. Dong,L.-L. Wang,Q. Qin,Q.-B. Wang,S. Wang,S.-N. Fu,S.-X Fang,T. -G. Xu,W. Kang,Y.- 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.I
The China Spallation Neutron Source (CSNS) is a high-power, accelerator-based project currently under preparation. The accelerator complex consists of an H$^-$ ion source, an H$^-$ linac, a rapid-cycling proton synchrotron, and the transport lines. During the past year, the design of most accelerator systems went through major iterations, and initial research and developments was started on the prototyping of several key components.
Ferroelectricity in Ternary II-VI Compounds
D. J. Fu,이동진,W.C. Lee,J. C. Lee,T. W. Kang 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.3
This paper presents a study on polarization hysteresis, current-voltage characteristics, and temperature dependence of polarization and capacitance of CdZnTe. The polarization-electric eld measurement shows a polarization of 0.6C/cm2 in CdZnTe, and the hysteresis is signicantly in uenced by carriers. The capacitance of CdZnTe consists of ferroelectric and depletion components. Electrical conduction in CdZnTe is modulated by the polarization, leading to hysteresis in the current-voltage characteristics. The polarization decreases in a continuous and diusive manner. Temperature dependent capacitance measurement demonstrates a maximum capacitance around 90C. Fitting of the capacitance data with the Curie-Weiss law shows the occurrence of a second-order type phase transition.
Fu, X.,Kim, M.S.,Chao, K.,Qin, J.,Lim, J.,Lee, H.,Garrido-Varo, A.,Perez-Marin, D.,Ying, Y. Applied Science Publishers 2014 Journal of food engineering Vol.124 No.-
Melamine (2,4,6-triamino-1,3,5-triazine) contamination of food has become an urgent and broadly recognized topic as a result of several food safety scares in the past five years. Hyperspectral imaging techniques that combine the advantages of spectroscopy and imaging have been widely applied for a variety of food quality and safety evaluations. In this study, near-infrared (NIR) hyperspectral imaging technique was investigated to detect low levels (≤1.0%) of melamine particles in milk powders. Following image preprocessing (normalization and background removal), the spectrum of each pixel in the sample images was compared to the pure melamine spectrum by spectral similarity measures including spectral angle measure (SAM), spectral correlation measure (SCM), and Euclidian distance measure (EDM). The three similarity analysis methods provided comparable results for melamine particle detection where imaging allowed visualization of the distribution of melamine particles within images of milk powder mixture samples that were prepared with various melamine concentrations. The classification results were verified by spectral feature comparison between separated mean spectra of melamine pixels and milk powder pixels. The study demonstrated that a combination of NIR hyperspectral imaging technique and spectral similarity analyses was an effective method for melamine adulteration discrimination in milk powders. The method described in this study can also be applied to other chemicals or multi-chemicals adulterant detection in milk powders.
Thermoelectric properties in p-type nanostructured Ge-doped Sb100GeTe150 alloy
J.L. Cui,H. Fu,X.L. Liu,D.Y. Chen,W. Yang 한국물리학회 2009 Current Applied Physics Vol.9 No.5
Ge-doped Sb100GeTe150 alloy were prepared using spark plasma sintering technique, and its thermoelectric properties were evaluated over the temperature range 318–492 K. Through XRD analysis, we observed the same single phase as Sb2Te3 and weakened diffraction peaks. Rietveld refinement reveals that there is 0.96 at.% Ge that occupies in the Sb sites, leading to the lattice distortion in the Sb–Te crystal. High-resolution TEM images show that there are many nanodomains randomly distributed in the matrix with a large amount of amorphous phase adjoined. Measurements indicated that the Seebeck coefficients (α) increase and the electrical and thermal conductivities decrease with temperature in the entire temperature range. The maximum α value reaches 135 μV/K at 492 K, and the thermal conductivities are about 0.3 W/mK lower than those of present Sb2Te3 for the corresponding temperatures. The highest thermoelectric figure of merit ZT for the nanostructured alloy Sb100GeTe150 is 0.84 at 492 K, whereas that of the currently prepared Sb2Te3 is 0.74 at the corresponding temperature. Ge-doped Sb100GeTe150 alloy were prepared using spark plasma sintering technique, and its thermoelectric properties were evaluated over the temperature range 318–492 K. Through XRD analysis, we observed the same single phase as Sb2Te3 and weakened diffraction peaks. Rietveld refinement reveals that there is 0.96 at.% Ge that occupies in the Sb sites, leading to the lattice distortion in the Sb–Te crystal. High-resolution TEM images show that there are many nanodomains randomly distributed in the matrix with a large amount of amorphous phase adjoined. Measurements indicated that the Seebeck coefficients (α) increase and the electrical and thermal conductivities decrease with temperature in the entire temperature range. The maximum α value reaches 135 μV/K at 492 K, and the thermal conductivities are about 0.3 W/mK lower than those of present Sb2Te3 for the corresponding temperatures. The highest thermoelectric figure of merit ZT for the nanostructured alloy Sb100GeTe150 is 0.84 at 492 K, whereas that of the currently prepared Sb2Te3 is 0.74 at the corresponding temperature.
Functions and values of sulfated polysaccharides from seaweed
D. P. Nagahawatta,N. M. Liyanage,Thilina U. Jayawardena,Fengqi Yang,H. H. A. C. K. Jayawardena,M. J. M. S. Kurera,Fahe Wang,Xiaoting Fu,전유진 한국조류학회I 2023 ALGAE Vol.38 No.4
Sulfated polysaccharides (SPs) isolated from seaweed have emerged as remarkable bioactive compounds with a wide spectrum of biological activities and have substantial value in the scientific and industrial domains. The current study explores the diverse biological activities of SPs and their relationship with their structures. This aids in an in-depth examination of the multifaceted biological activities of SPs, including anticoagulant, anti-inflammatory, antiviral, antioxidant, and immunomodulatory properties, which underpin their potential health benefits. Furthermore, the current study explores the complicated properties of SPs, with their extraction methodologies and techniques for precise characterization. Elucidation of the commercial significance of SPs derived from brown, red, and green seaweed by highlighting their potential applications has emphasized their importance in human well-being. Further, this review emphasizes the challenges needed to overcome research and industrial innovations for SPs. Collaboration among researchers, industry stakeholders, and regulatory authorities can overcome these challenges and elevate the potential of SPs to revolutionize industries such as pharmaceuticals, cosmeceuticals, food, and biotechnology.
Microsatellite-based Genetic Diversity and Evolutionary Relationships of Six Dog Breeds
Ye, J.-H.,Ren, D.-R.,Xie, A.-F.,Wu, X.-P.,Xu, L.,Fu, P.-F.,Zhao, H.-A.,Yang, Qianyong Asian Australasian Association of Animal Productio 2009 Animal Bioscience Vol.22 No.8
The Tibetan Mastiff is one of the most archaic, ferocious and the largest dogs in the world. The Kunming dog is the chief working-dog breed in China. In this study, ten microsatellite loci were used to assess the genetic diversity and evolutionary relationships in six dog breeds, including Tibetan Mastiff, Kunming dog, Belgian Malinois, Labrador Retriever, English Springer Spaniel, and German Shepherd. The highest genetic diversity was exhibited by the Tibetan Mastiff, indicating useful protection and little inbreeding in the modern Tibetan Mastiff. Higher genetic diversity was observed in European breeds, supporting the hypotheses that breeders outcross their pure breed dogs occasionally to avoid deleterious effects in Europe. Evolutionary relationships showed that English Springer Spaniel and Labrador Retriever were clustered together, then with the Tibetan Mastiff, consistent with previous cluster results. German Shepherd and Kunming dog were grouped together, coinciding with the breeding history of Kunming dog. It is the first time that Tibetan Mastiff and Kunming dog have been analyzed with microsatellites.