Pub Date : 2022-11-01DOI: 10.3724/sp.j.1249.2022.06719
Zongqi Sun, Peng Yang, Jing Wu, Yang Yang
: The optimal barrier dividend problem under excess of loss reinsurance strategy has rarely been studied so far. We combine the risk factors such as market friction and terminal residual value with risk investment and risk control strategy, and study the resulting optimal investment - excess of loss reinsurance - barrier dividend problem. Based on the dynamic programming principle, we establish the Hamilton - Jacobi - Bellman equation, and obtain the explicit solutions for the optimal investment - excess of loss reinsurance strategy. The optimal dividend function is solved by the differential - integral method. The existence and uniqueness of the optimal dividend boundary is proved.
{"title":"Optimal excess of loss reinsurance-barrier dividend strategies with investment","authors":"Zongqi Sun, Peng Yang, Jing Wu, Yang Yang","doi":"10.3724/sp.j.1249.2022.06719","DOIUrl":"https://doi.org/10.3724/sp.j.1249.2022.06719","url":null,"abstract":": The optimal barrier dividend problem under excess of loss reinsurance strategy has rarely been studied so far. We combine the risk factors such as market friction and terminal residual value with risk investment and risk control strategy, and study the resulting optimal investment - excess of loss reinsurance - barrier dividend problem. Based on the dynamic programming principle, we establish the Hamilton - Jacobi - Bellman equation, and obtain the explicit solutions for the optimal investment - excess of loss reinsurance strategy. The optimal dividend function is solved by the differential - integral method. The existence and uniqueness of the optimal dividend boundary is proved.","PeriodicalId":35396,"journal":{"name":"Shenzhen Daxue Xuebao (Ligong Ban)/Journal of Shenzhen University Science and Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41633250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-01DOI: 10.3724/sp.j.1249.2022.06668
Xin Zhao, Haoran Sun, Z. Qiu, Weian Huang, Jiafang Xu, H. Zhong
{"title":"Drilling fluid for stabilizing the wellbore in compound-salt formation based on multiple-synergism-method","authors":"Xin Zhao, Haoran Sun, Z. Qiu, Weian Huang, Jiafang Xu, H. Zhong","doi":"10.3724/sp.j.1249.2022.06668","DOIUrl":"https://doi.org/10.3724/sp.j.1249.2022.06668","url":null,"abstract":"","PeriodicalId":35396,"journal":{"name":"Shenzhen Daxue Xuebao (Ligong Ban)/Journal of Shenzhen University Science and Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42317496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-01DOI: 10.3724/sp.j.1249.2022.06701
Shaobin CHEN, Baiying Lei, Hai Xie, Guoming Zhang, Yueshanyi Du, Xinyu Zhao
{"title":"Classification of retinopathy of prematurity based on mixed attention","authors":"Shaobin CHEN, Baiying Lei, Hai Xie, Guoming Zhang, Yueshanyi Du, Xinyu Zhao","doi":"10.3724/sp.j.1249.2022.06701","DOIUrl":"https://doi.org/10.3724/sp.j.1249.2022.06701","url":null,"abstract":"","PeriodicalId":35396,"journal":{"name":"Shenzhen Daxue Xuebao (Ligong Ban)/Journal of Shenzhen University Science and Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43479846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-01DOI: 10.3724/sp.j.1249.2022.06649
Linsong Cheng, Junjie Shi, R. Cao, Chenxu Yang, Xulin Du
{"title":"Influence of local thermal non-equilibrium on enhanced geothermal system","authors":"Linsong Cheng, Junjie Shi, R. Cao, Chenxu Yang, Xulin Du","doi":"10.3724/sp.j.1249.2022.06649","DOIUrl":"https://doi.org/10.3724/sp.j.1249.2022.06649","url":null,"abstract":"","PeriodicalId":35396,"journal":{"name":"Shenzhen Daxue Xuebao (Ligong Ban)/Journal of Shenzhen University Science and Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45371279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-01DOI: 10.3724/sp.j.1249.2022.06622
Yafang Zhang, L. Duan, Juan Lu, Yongjie Huo
Abstract: In order to study the impact resistance and dynamic damage rule of reinforced concrete (RC) beams strengthened with carbon fiber reinforced plastics (CFRP) under different impact velocities, four CFRP strengthened RC beams were tested by using a drop-hammer impact device. The analysis results of the failure pattern, crack propagation rule, dynamic time history response and energy dissipation of the strengthened beams show that with increase of the impact velocity, the width of the main bending crack in the mid-span of CFRP strengthened beam increases first and then decreases, and the width of the main oblique crack in the mid-span increases continuously. It can also be identified that overall crack distribution converges to the mid-span area. Furthermore, the peak impact force and the mid-span peak displacement are linearly dependent to the impact velocity. The energy dissipation capacity of strengthened beams increases nonlinearly with the increase of impact velocity. The greater the impact velocity is, the less the increase rate of the energy dissipation capacity of the strengthened beam is. In addition, four stages can be divided in the test based on development of mid-span displacement, which are linear growing, nonlinear growing, rebounding and stable stages, respectively. The study can provide reference for optimal design of RC beams strengthened with CFRP.
{"title":"Influence of impact velocity on dynamic performance of reinforced concrete beams strengthened with CFRP","authors":"Yafang Zhang, L. Duan, Juan Lu, Yongjie Huo","doi":"10.3724/sp.j.1249.2022.06622","DOIUrl":"https://doi.org/10.3724/sp.j.1249.2022.06622","url":null,"abstract":"Abstract: In order to study the impact resistance and dynamic damage rule of reinforced concrete (RC) beams strengthened with carbon fiber reinforced plastics (CFRP) under different impact velocities, four CFRP strengthened RC beams were tested by using a drop-hammer impact device. The analysis results of the failure pattern, crack propagation rule, dynamic time history response and energy dissipation of the strengthened beams show that with increase of the impact velocity, the width of the main bending crack in the mid-span of CFRP strengthened beam increases first and then decreases, and the width of the main oblique crack in the mid-span increases continuously. It can also be identified that overall crack distribution converges to the mid-span area. Furthermore, the peak impact force and the mid-span peak displacement are linearly dependent to the impact velocity. The energy dissipation capacity of strengthened beams increases nonlinearly with the increase of impact velocity. The greater the impact velocity is, the less the increase rate of the energy dissipation capacity of the strengthened beam is. In addition, four stages can be divided in the test based on development of mid-span displacement, which are linear growing, nonlinear growing, rebounding and stable stages, respectively. The study can provide reference for optimal design of RC beams strengthened with CFRP.","PeriodicalId":35396,"journal":{"name":"Shenzhen Daxue Xuebao (Ligong Ban)/Journal of Shenzhen University Science and Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41504345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract: In order to study the effects of surface curing treatment with ethyl silicate, siliconizing agent, and nano SiO2 on the performance of airport pavement concrete, the capillary water absorption, fire resistance, water permeability resistance, frost resistance, and sulfate attack resistance of concrete treated with three surface curing materials were tested, and the applicability of surface curing materials on airport pavement was analyzed The results show that the comprehensive performance of the silicon penetrating agent is excellent, and the reduction rate of the water permeability height of the treated concrete reaches 44. 5% 2%, and the construction process is mature, making it the most suitable surface curing material for airport pavement concrete; The performance improvement effect of ethyl silicate is significant. After treatment, the water absorption of concrete after 7 days decreases by 90%, and after 60 minutes of fire corrosion, it can still reach 68 1%, the frost resistance level has been increased from F125 to F175, but the mixed solution has a certain degree of explosiveness, and its application in airport pavement concrete still needs further exploration; The performance improvement effect of nano SiO2 is not significant among the three surface curing materials and is not recommended for use in airport pavement concrete The research results can provide reference for the selection of surface curing materials in airport engineering Keywords: building materials; Concrete; Surface curing; Ethyl silicate; Silicone penetrating agent; Nano SiO2; Classification number of airport pavement: TU528 58 Reference code: A doi: 10 3724/SP J. 1249 2022. 06642
{"title":"Influence of different surface curing materials on pavement concrete properties","authors":"Tianlun Li, Yonggen Wu, Haoxiang Wu","doi":"10.3724/sp.j.1249.2022.06642","DOIUrl":"https://doi.org/10.3724/sp.j.1249.2022.06642","url":null,"abstract":"摘 要:为研究硅酸乙酯、硅渗剂和纳米SiO2表面固化处理对机场道面混凝土性能的影响,分别对经 过3种表面固化材料处理后的混凝土的毛细吸水性、耐火蚀性、抗水渗透性、抗冻性和抗硫酸盐侵蚀性进 行测试,分析表面固化材料在机场道面的适用性 . 结果表明,硅渗剂的综合表现优异,处理后混凝土的渗 水高度降低率达到44. 2%,而且施工工艺成熟,最适合作为机场道面混凝土的表面固化材料;硅酸乙酯的 性能改善效果显著,处理后混凝土的 7 d吸水量降低 90%,经过 60 min火蚀后仍能达到 68. 1%,抗冻等级 由F125提高至F175,但混合溶液具有一定的易爆性,在机场道面混凝土上的应用还需要深入探究;纳米 SiO2的性能改善效果在3种表面固化材料中不够明显,不推荐应用于机场道面混凝土 . 研究结果可为机场 工程中表面固化材料的选择提供借鉴 . 关键词:建筑材料;混凝土;表面固化;硅酸乙酯;硅渗剂;纳米SiO2;机场道面 中图分类号:TU528. 58 文献标志码:A doi:10. 3724/SP. J. 1249. 2022. 06642","PeriodicalId":35396,"journal":{"name":"Shenzhen Daxue Xuebao (Ligong Ban)/Journal of Shenzhen University Science and Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43065814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-01DOI: 10.3724/sp.j.1249.2022.06660
R. Nie, Ran Jia, Mingjin Cai, H. Li, Cong Lu, Lan Yang
{"title":"Analysis on the pressure dynamic characteristics of slanted well in dual-porosity and dual-permeability reservoir","authors":"R. Nie, Ran Jia, Mingjin Cai, H. Li, Cong Lu, Lan Yang","doi":"10.3724/sp.j.1249.2022.06660","DOIUrl":"https://doi.org/10.3724/sp.j.1249.2022.06660","url":null,"abstract":"","PeriodicalId":35396,"journal":{"name":"Shenzhen Daxue Xuebao (Ligong Ban)/Journal of Shenzhen University Science and Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45454018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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