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Marine Geo-environmental Disaster: Field Survey and In-situ Long-term Observation
( Yonggang Jia ),( Cong Hu ),( Zhiwen Sun ),( Hong Zhang ),( Hongxian Shan ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
Ocean exploitation has entered full ocean depth era. However, frequent marine geological disasters seriously restrict its development. Due to the complex marine engineering geology environment, in-situ observation has become an important means of submarine engineering survey. Based on the common types of marine geological disasters in marine engineering activities, this paper introduces the marine engineering geological survey and in-situ monitoring technology and its application from the perspective of marine engineering geological environment and dynamic action, so as to provide new ideas for the study of marine geological disasters in China.
Yonggang Du,Liangxin Qiao,Dingyuan Xue,Yulei Jia 한국광학회 2022 Current Optics and Photonics Vol.6 No.4
A photodetector based on a reduced graphene oxide (RGO)/n-Si heterojunction with high responsivity, detectivity and fast response speed is presented. Here, we put forward a simple vacuum filtration method to prepare RGO film and transfer it onto an n-Si substrate to form an RGO/n-Si heterojunction. The experimental results show that the heterojunction has good rectification characteristics, and the response and recovery time are less than 0.31 s and 0.25 s, respectively. Under 470 nm light conditions at −2 V applied voltage, the responsivity and detectivity of the device are 65 mA/W and 4.02 × 10 10cmHz 1/2 W −1 , respectively. The simple preparation process and good performance of the RGO/n-Si heterojunction make it a promising material for photoelectric detection, especially in the near-ultraviolet band.
Land and Sea Engineering Geological Model and Division of the Laizhou Bay Coast, China
( Xiaoshuai Song ),( Yonggang Jia ),( Hongxian Shan ),( Xiaolei Liu ),( Yong Zhang ),( Xianghuai Kong ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
In order to meet the development demands of Laizhou Bay Coastal Zone, there has carried out, including engineering survey, engineering geological drilling, in-situ test (standard penetration test), laboratory test, theoretical analysis and other research methods, in line with the layout of geo-spatial development and its geological environment characteristics. Through the analysis of the essential data, the stratigraphic structure, topography, geological structure and hydrogeological conditions of the study area were obtained. Based on the measured data of 24 engineering geological boreholes and the collected data of 202 boreholes, nine engineering geological layers were determined. And the types of rock and soil, the distribution of poor geological bodies and the engineering geology structural features have been understood. Based on that, the three-dimensional engineering geological model of Laizhou Bay coastal zone was established by using the software Mapgis K9. The image of the model objectively reflected the engineering stratigraphic structure and geological characteristics of the study area. Finally, the land area of the study area was divided into three major engineering geological areas and eight engineering geological sub-areas. Similarly, the sea area was divided into three major areas and six geological sub-areas. This work can provide local government with detailed and reliable basic data for development planning, provide scientific basis for coastal economic construction and sustainable development, and serve land and resources utilization, coastal zone development and management and planning.
Consolidation Characteristics of Rapidly Deposited Yellow River-Derived Sediment in Estuary Delta
( Hong Zhang ),( Yonggang Jia ),( Xiaolei Liu ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
The Yellow River, which presently discharges into the western Bohai Sea, is widely recognized as one of the highest sediment loads on Earth, about 1 × 109 t/y. Nevertheless, the fate of the remaining sediments delivered to the ocean is still not completely clear. Moreover, the consolidation of sediment at the river mouth contributes on the riverine sediment transport and depositional processes, and the evolution of deltaic morphology. In this study, we conducted in-situ experiments at an abandoned subaqueous delta lobe (Diaokou lobe) from 2004 to 2016 to investigate the consolidation process of the sediment. The goal was to improve our knowledge of the consolidation process of the Yellow River-derived sediment input to delta and to link the potential impacts on the fate of sediment. Our results show that the consolidation of the Yellow River derived sediment can complete during in 1500 minutes, and occur as over-consolidation phenomenon. In addition, the strength of the sediment changed over wide range of temporal and spatial scales. However, the sediment will change with the time of hydrodynamic action and even lead to liquefaction or submarine landslides.
An Efficient Method for Electron-Atom Scattering Using Ab-initio Calculations
Yuan Xu,Yonggang Yang,Liantuan Xiao,Suotang Jia 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.70 No.4
We present an efficient method based on ab-initio calculations to investigate electron-atom scatterings. Those calculations profit from methods implemented in standard quantum chemistry programs. The new approach is applied to electron-helium scattering. The results are compared with experimental and other theoretical references to demonstrate the efficiency of our method.