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Evolution of Bond Distortion in $C_{60}$ by an Electron Uptake
Rang Tan Fu,Kee Hag Lee,Tae Young Park,Xin Sun,Zhi Gang Yu Korean Chemical Society 1994 Bulletin of the Korean Chemical Society Vol.15 No.2
When an electron is transferred to $C_{60}$, the bond structure is distorted due to the electron-lattice interaction and a polaron-like state is formed. The evolution process of the bond distortion is studied by the dynamical equation of atomic lattice, and time-dependent changes of the bond lengths are determined. Then it can be estimated that the relaxation time to form the polaron-like state is a fraction of a picosecond.
Fu, Deyi,Zhao, Xiaoxu,Zhang, Yu-Yang,Li, Linjun,Xu, Hai,Jang, A-Rang,Yoon, Seong In,Song, Peng,Poh, Sock Mui,Ren, Tianhua,Ding, Zijing,Fu, Wei,Shin, Tae Joo,Shin, Hyeon Suk,Pantelides, Sokrates T.,Zho American Chemical Society 2017 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.139 No.27
<P>Atomically thin molybdenum disulfide (MoS2), a direct-band-gap semiconductor, is promising for applications in electronics and optoelectronics, but the scalable synthesis of highly crystalline film remains challenging. Here we report the successful epitaxial growth of a continuous, uniform, highly crystalline monolayer MoS2 film on hexagonal boron nitride (h-BN) by molecular beam epitaxy. Atomic force microscopy and electron microscopy studies reveal that MoS2 grown on h-BN primarily consists of two types of nucleation grains (0 aligned and 60 degrees antialigned domains). By adopting a high growth temperature and ultralow precursor flux, the formation of 60 degrees antialigned grains is largely suppressed. The resulting perfectly aligned grains merge seamlessly into a highly crystalline film. Large-scale monolayer MoS2 film can be grown on a 2 in. h-BN/sapphire wafer, for which surface morphology and Raman mapping confirm good spatial uniformity. Our study represents a significant step in the scalable synthesis of highly crystalline MoS2 films on atomically flat surfaces and paves the way to large-scale applications.</P>
Esophageal/Gastric Cancer Screening in High-risk Populations in Henan Province, China
Lu, Yu-Fei,Liu, Zhi-Cai,Li, Zhong-Hong,Ma, Wen-Hao,Wang, Fu-Rang,Zhang, Ya-Bing,Lu, Jian-Bang Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.3
Objective: To summarize the endoscopic screening findings in high-risk population of esophageal and gastric carcinoma and analyze influential factors related to screening. Methods: In seven selected cities and counties with high incidences of esophageal carcinoma, people at age of 40-69 were set as the target population. Those with gastroscopy contradictions were excluded, and all who were voluntary and willing to comply with the medical requirements were subjected to endoscopic screening and histological examination for esophageal, gastric cardia and gastric carcinoma in accordance with national technical manual for early detection and treatment of cancer. Results: In three years, 36,154 people were screened, and 16,847 (46.60%) cases were found to have precancerous lesions. A total of 875 cases were found to have cancers (2.42%), and among them 739 cases had early stage with an early diagnosis rate is 84.5%. Some 715 patients underwent prompt treatment and the success rate was 81.8%. Conclusions: In a high-risk population of esophageal and gastric carcinoma, it is feasible to implement early detection and treatment by endoscopic screening. Screening can identify potential invasive carcinoma, early stage carcinoma and precancerous lesions, improving efficacy through early detection and treatment. The exploratory analysis of related influential factors will help broad implementation of early detection and treatment for esophageal and gastric carcinoma.
한국인 및 중국 한족 정신분열병 환자의 5-HT2A 수용체 유전자 -1438A/G 다형성
이장호,이광철,이승부,오용인,최영근,조아랑,정주호,장환일 大韓神經精神醫學會 2005 신경정신의학 Vol.44 No.1
Objectives : The purpose of the present study was to investigate the association between -1438A/G polymorphism of 5-HT2A receptor gene and schizophrenia in Korean and Han Chinese population. Methods : A sample of 184 Korean patients with schizophrenia and 96 Korean healthy normal controls and 96 Han Chinese patients with schizophrenia and 96 Han-Chinese healthy normal controls were genotyped for a single nucleotide polymorphism with in 5-HT2A receptor gene (promoter region, A-1438G) by Msp I Resthction Fragment Length Polymorphism (RFLP). Results : There was no difference in allelic frequencies and genotype frequencies of -1438A/G polymorphism between Korean schizophrenics and controls (p=0.13) and Han Chinese schizophrenics and controls (p=0.40). Also, -1438A/G Poly-morphism did not show ethnical difference between Korean and Han Chinese controls. The Scale for the Assessment of Negative Symptoms (SANS) scores showed no significant differences between genotypes of -1438A/G polymorphism in both of Korean and Han Chinese schizophrenics. Conclusion : These results suggest that -1438A/G polymorphism of the 5-HT2A receptor gene is not causally related to the development of schizophrenia in Korean and Han Chinese population, and there no ethnic difference between Korean and Han Chinese population.