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Shengwei Zhang,Lihong Cai,Thi Anh Nguyet Nguyen,Meiling Geng,Kun Gao,Sung-Tae Hong,Moon-Jo Kim 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.10 No.2
Aluminum clad steel (ACS) sheets are heat treated by electrically assisted rapid heat treatment (subsecond duration) to balance their strength and ductility. The results of microstructural analysis show that the electric current results in the formation of different intermetallic compounds (IMCs) attributed to the rapid heating and the athermal effect of the electric current. The different IMCs affect the interfacial bonding strength and the mechanical properties of the ACS sheet. The tensile tests suggest that the yield strength of the ACS sheet gradually decreases, while the elongation gradually increases up to the current density of 170 A/mm2. In contrast, a higher current density of 190 A/mm2 dramatically increases the thickness of the IMC layer, resulting in premature fracture of the ACS sheet due to early interfacial debonding. The fracture mechanism is found to be a matrix-dominated fracture or interfacial IMC-dominated fracture depending on the applied current density. Moreover, the U-shape forming test confirms that the enhanced interfacial bonding strength and favorable formability of the ACS sheet can be achieved by repeatedly applying the electric pulses of 170 A/mm2 four times rather than using the single electric pulse of 190 A/mm2 due to the formation of a thick IMC layer under the high current density of 190 A/mm2. The present study proves that the electrically assisted rapid heat treatment is an efficient method to balance the strength and formability of the ACS sheet.
C-Band Synthetic Aperture Microwave Radiometer and Its Imaging Experiments
Shengwei, Zhang,Xiaolong, Dong,Ji, Wu,Jingshan, Jiang,Shifeng, Zheng 대한원격탐사학회 2001 International Symposium on Remote Sensing Vol.17 No.1
The principles of the interferometric synthetic aperture was been briefly introduced, the system design of a C-band microwave interferometric synthetic aperture radiometer is presented. This systemhas a 6-element thinned array with 11 analog complex correlator to obtain the 11 visibility function spatial- frequency terns, which result in 22 digitally synthesizedspatial resolution cell. So the synthetic apertureradiometer have a spatial resolution as high as one 22nd of that corresponding to one antenna element. Thesynthetic radiometer has a real aperture resolution cell in the along-hack direction and has 22 synthetic apertureresolution cells in the cross-track direction. Finally, the results of imaging experiments are given.
Junbo Zhang,Shuanghong Yin,Fei Guo,Ren Meng,Chuangfu Chen,Hui Zhang,Zhi-qiang Li,Qiang Fu,Huijun Shi,Shengwei Hu,Wei Ni,Tiansen Li,Ke Zhang 한국미생물학회 2014 The journal of microbiology Vol.52 No.8
Brucellosis is a globally distributed zoonotic disease that causes animal and human diseases. However, the current Brucella abortus vaccines (S19 and RB51) are deficient; they can cause abortion in pregnant animals. Moreover, when the vaccine S19 is used, tests cannot differentiate natural from vaccinated infection. Therefore, a safer and more potent vaccine is needed. A Brucella abortus 2308 ery promoter mutant (Δery) was constructed to overcome these drawbacks. The growth of the Δery mutant was significantly attenuated in macrophages and mice and induced high protective immunity in mice. Moreover, Δery induced an anti-Brucellaspecific IgG (immunoglobulin G) response and stimulated the expression of interferon-gamma (INF-γ) and interleukin-4 (IL-4). Furthermore, the expression of EryA antigen allowed for the serological differentiation between natural and vaccinated infection in mice. These results indicate that the Δery mutant is a potential attenuated live vaccine candidate against virulent Brucella abortus 2308 (S2308) infection.
Xiangyu Zhang,Cunyuan Li,Xiaoyue Li,Zhijin Liu,Wei Ni,Yang Cao,Yang Yao,Esenbay Islamov,Junchang Wei,Xiaoxu Hou,Shengwei Hu 한국유전학회 2019 Genes & Genomics Vol.41 No.10
Introduction The vertebral number is an economically significant trait, which is associated with body length and carcass traits. Nuclear Receptor Subfamily 6, Group A, Member 1 (NR6A1) is a member of the nuclear receptor superfamily and it plays an important role in the early development of embryos. Objectives The NR6A1 gene was considered as an important candidate for influence vertebrae number, while the potential associations between this gene and the number of lumbar vertebrae traits of sheep have not been explored. Methods In this study, we detected the genetic variants of NR6A1 gene and analyzed the associations of the polymorphisms with lumbar number traits in 130 Kazakh sheep. We use single-strand conformation polymorphism (SSCP) technique to detect single nucleotide polymorphism (SNP) of NR6A1 gene, and the association of the genotype and lumbar number variation was analyzed by independent Chi-square test. Results We detect SNP of NR6A1 gene by PCR-SSCP technique, and polymorphisms were only found in the coding region of exon-6 and exon-8 of NR6A1 gene. In order to investigate the connection between the SNP locus and lumbar number traits in sheep, we conducted a Chi-square test for independence for exon-6 and exon-8 of NR6A1 gene, respectively. Association analysis revealed significant associations between the SNP (rs414302710: A >C) in the exon-8 of NR6A1 gene with the number of lumbar vertebrae (P < 0.01). Conclusion Our study indicated that this SNP (rs414302710: A>C) locus of exon-8 of NR6A1 gene in sheep possible influence the number of lumbar vertebrae, which has the potential to be applied in selective breeding of sheep.
Study of Spaceborne W-band Millimeter Wave Radiometer
Jing, Li,Shengwei, Zhang,Maohua, Sun,Decai, Kong,Heguang, Liu,Jingshan, Jiang 대한원격탐사학회 2001 International Symposium on Remote Sensing Vol.17 No.1
The W-band millimeter wave radiometer has been studied under the support of Chinese Academy of Science (CAS) and it is successfully studied for the first time in China. Its technical index is suitable for the use in space. The main characteristics of the W-band millimeter wave radiometer are introduced in this paper.
Qin Xin,Wan Jianbo,Zhang Qi,Zhang Yongjie,Yu Huangzhong,Shi Shengwei 한국탄소학회 2023 Carbon Letters Vol.33 No.3
Graphitic carbon nitride (g-C3N4) has attracted extensive attention in energy storage due to its suitable and tunable bandgap, high chemical/thermal stability, earth abundance and environmental friendliness. However, its conductivity should be improved to work as the electrode materials in supercapacitors. In this report, we have prepared a two-dimensional composite (CN-PANI) based on g-C3N4 and polyaniline (PANI) by in-situ polymerization, which can be efficiently applied as electrode material for supercapacitors. The introduction of PANI can increase the conductivity of the electrode, and the porous structure of g-C3N4 can provide enough channels for the transport of electrolyte ions and improve the electrode stability. As a result, the obtained CN-PANI demonstrates excellent specific capacitance (234.0 F g−1 at 5 mV/s), good rate performance and high cycling stability (86.2% after 10,000 cycles at 50 mV/s), showing great potential for high-rate supercapacitors.