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A Refueling Scheme Optimization Model for the Voyage Charter with Fuel Price Fluctuation and Ship Deployment Consideration

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Journal of Systems Science and Information 2017年第3期8卷 267-278页

作者： Peng JIA Weilun ZHANG Wenhao E xueshan sun School of Economics and Management University of Chinese Academy of Sciences Collaborative Innovation Center for Transport Studies Dalian Maritime University Transportation Management College Dalian Maritime University Zhonghuan Information College Tianjin University of Technology

Due to the long operation cycle of maritime transportation and frequent fluctuations of the bunker fuel price, the refueling expenditure of a chartered ship at different time or ports of call make significant difference. From the perspective of shipping company, an optimal set of refueling schemes for a ship fleet operating on different voyage charter routes is an important decision. To address this issue, this paper presents an approach to optimize the refueling scheme and the ship deployment simultaneously with considering the trend of fuel price fluctuations. Firstly, an ARMA model is applied to forecast a time serials of the fuel prices. Then a mixed-integer nonlinear programming model is proposed to maximize total operating profit of the shipping company. Finally, a case study on a charter company with three bulk carriers and three voyage charter routes is conducted. The results show that the optimal solution saves the cost of 437,900 USD compared with the traditional refueling scheme, and verify the rationality and validity of the model.

关键词： voyage charter refueling scheme optimization ship deployment bunker fuel price prediction

Let-7i-5p maintains the stemness via R-spondin2/Wnt pathway in hepatocellular carcinoma

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Genes & Diseases 2024年第4期11卷 20-23页

作者： Qinghua Wei xueshan Dai Jiahui Wei Wenwei sun Xiaoqian Yang Yuxin Zhang Xin Guo Yi Chen College of Pharmaceutical Sciences&Chinese Medicine Southwest UniversityChongqing 400716China Center for Basic Medical Research TEDA International Cardiovascular HospitalChinese Academy of Medical Sciences&Peking Union Medical CollegeTianjin 300457China Chongqing Key Laboratory of New Drug Screening from Traditional Chinese Medicine Chongqing 400716China pharmacology of Chinese Materia Medica-the Key Discipline Constructed by the State Administration of Traditional Chinese Medicine Chongqing 400716China Division of Cell Developmental and Integrative BiologySchool of MedicineSouth China University of TechnologyGuangzhouGuangdong 510006China National Demonstration Center for Experimental Pharmacy Education(Southwest University) Chongqing 400716China Engineering Research Center of Coptis Development and Utilization(Ministry of Education) College of Pharmaceutical Sciences and Chinese MedicineSouthwest UniversityChongqing 400716China

Cancer stem cells(CSCs)are related to tumorigenesis,recurrence,metastasis,and drug resistance in hepatocellular carcinoma(HCC).1 Let-7i is a noncoding small RNA,belonging to the famous miRNA let-7 ***,let-7i has been ... 详细信息

关键词： hepatocellular Cancer metastasis

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“互联网+”环境下集群创新趋势与对策研究

科技进步与对策 2017年第6期34卷 15-19页

作者：魏津瑜孙学珊天津理工大学管理学院天津300384 天津理工大学中环信息学院天津300380

集群创新是提升集群竞争力与稳定集群市场地位的重要途径。伴随"互联网+"行动计划的提出与实施,我国集群创新与发展呈现出数据化、跨界性及广泛性等新趋势,也对集群创新提出了新要求。通过分析我国集群发展现状及"互联网+"环境下集群创... 详细信息

集群创新是提升集群竞争力与稳定集群市场地位的重要途径。伴随"互联网+"行动计划的提出与实施,我国集群创新与发展呈现出数据化、跨界性及广泛性等新趋势,也对集群创新提出了新要求。通过分析我国集群发展现状及"互联网+"环境下集群创新趋势,揭示"互联网+"与集群创新相融合的综合价值,从企业、集群及政府层面阐述新环境下集群创新发展对策,可为实现"互联网+"环境下的集群创新提供借鉴。

关键词：互联网+ 集群创新价值分析

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环日本海地区的航线优化研究

中国航海 2011年第3期34卷 108-112页

作者：孙学珊杨忠振大连海事大学交通运输管理学院辽宁大连116026

随着环日本海地区贸易往来的频繁,优化该地区航运网络结构,提升海运通达性,成为推动该地区经济发展的重要手段。因此,提出一个以航运企业利润最大为目标的航线网络优化模型。该模型综合考虑航线、船型与需求间的关系,以船舶的载重量为约... 详细信息

随着环日本海地区贸易往来的频繁,优化该地区航运网络结构,提升海运通达性,成为推动该地区经济发展的重要手段。因此,提出一个以航运企业利润最大为目标的航线网络优化模型。该模型综合考虑航线、船型与需求间的关系,以船舶的载重量为约束,优化航运企业的资源配置,设计航线及选择适宜船型。利用实际数据对该模型进行检验,结果显示,优化的航线网络以及确定船型在不同经济条件下有所差别,可为环日本海航线的开辟与运营提供借鉴。

关键词：水路运输环绕航线优化模型船型环日本海地区

场所精神的构建与广场文化的营造——淮南市中心广场规划方案的设计与启示

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中国勘察设计 2001年第12期 34-36页

作者：孙学山淮南市规划设计研究院

本文从实际和理论上阐述了城市广场既是城市的标志,也是最能反映都市文明开放空间,并结合实践提出,只有打破常规,放开思路用心去做才能避免平庸,创作出新颖、别致的好方案。

关键词：城市广场淮南市规划设计

Divergent responses of runoff to climate change in the upper basins of the Third Pole dominated by westerlies and monsoon

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Science China Earth Sciences 2024年第8期67卷 2592-2614页

作者： Qikai sun Fengge SU He sun State Key Laboratory of Tibetan Plateau Earth System Environment and Resources(TPESER)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100101China

The diverse climates,distribution of snow and glaciers,and geographic locations directly affect the runoff response to climate change in the upper basins of the Third *** present,a comprehensive analysis of runoff variations and their distinct responses to climate change in the westerlies-and monsoon-dominated upper basins is still *** study comprehensively analyzed annual runoff variations in westerlies-dominated basins(the upper basins of the Aksu(UAKS),Syr Darya(USRD),Yarkant(UYK),Hotan(UHT),Amu Darya(UAMD),and Indus(UI))and monsoon-dominated basins(the upper basins of the Yangtze(UYA),Yellow(UYE),Lancang(ULC),Nujiang(UNJ),and Yarlung Zangbo(UYZ))of the Third Pole from 1961 *** multi-source meteorological data and large-scale circulation factors,this study investigated the divergent responses of runoff in the upper basins to climate change,and explored the large-scale circulation mechanisms underlying runoff variations in these upper *** results showed that:(1)The annual runoff in the majority of upper basins(except for the UYE and UYZ)exhibited an increasing trend,and the annual runoff in the UAKS,UYK,and UI showed a significant increasing trend from1961 to *** annual runoff in the upper basins of the Third Pole changed abruptly from decreasing to increasing between the 1980s and 2000s,with the exception of the UYE.(2)The runoff in the monsoon-dominated upper basins has been controlled primarily by changes in precipitation over the past 55 *** contrast,the runoff in the westerlies-dominated upper basins exhibited three distinct long-term responses to climate change:temperature-dominated(UYK and UHT),precipitation-dominated(USRD and UAMD),and the combined influence of precipitation and temperature(UAKS and UI).Since the 1960s,the sensitivity of runoff to warm season temperature changes in the most westerlies-dominated upper basins has decreased,while the response of runoff to precipitation changes has intensified.(3)The stud

关键词： Upper basins of the Third Pole Climate change Westerlies and monsoon Runoff variations Large-scale circulation factors

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New perspectives on deep carbon cycling

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Science China Earth Sciences 2024年第8期67卷 2411-2422页

作者： Weidong sun Center of Deep Sea Research Key Laboratory of Ocean Observation and ForecastingInstitute of OceanologyChinese Academy of SciencesQingdao 266071China Laoshan Laboratory Qingdao 266237China University of Chinese Academy of Sciences Beijing 100049China

The proto-atmosphere serves as a crucial starting point for the carbon *** based on atmospheric data from Mars and Venus suggest that Earth's proto-atmosphere contained>110 bar of CO_(2)and>2.6 bar of *** protoatmosphere had over 1000 bar of water vapor during the magma ocean stage,assuming the proto-ocean had a volume of two oceans of *** this stage both water and carbon dioxide were in a supercritical state at the magma-atmosphere *** serpentinization reactions occurred due to rock-water interaction,producing abundant ***,nitrogen is reduced to ammonia,and carbon dioxide to methane,forming carbonate *** proto-atmosphere dominated by methane,ammonia,and hydrogen formed a significant amount of amino acids through *** process is essential not only to the origin of life,but also to the early carbon-nitrogen cycle on *** the Hadean eon,a large amount of CO_(2)was sequestered as carbonate and organic ***,it mainly entered the deep mantle through mantle overturn or *** the mantle transition zone,carbonate undergoes“Redox freezing”,where carbonate is reduced to diamond through oxidation of ferrous iron in the *** the lower mantle,Fe^(2+)undergoes disproportionation reactions,forming Fe^(3+)and metallic *** these,Fe^(3+)mainly resides in bridgmanite,thereby increasing the oxygen fugacity of the lower mantle,while metallic iron falls to the Earth's *** distribution of carbon in the mantle is crucial for deep carbon *** density curves of diamond and mantle peridotite melt intersect at the bottom of the mantle transition zone(about 660 km).This density crossover leads to the accumulation of diamond during the magma ocean *** materials such as subducting slabs enter the lower mantle,compensatory upwelling of lower mantle material *** enters the upper mantle,decomposes,releasing Fe^(3+)ions and oxidizes diamond

关键词： Carbon cycling Proto-atmosphere Amino acids Subduction initiation Passive margin subduction Atmospheric carbon dioxide

以“激素治疗”案为例谈医师告知义务履行的合理边界

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医学教育管理 2019年第6期5卷 566-570页

作者：孙雪山马辉首都医科大学医学人文学院

在“激素治疗”案中,由于患者对知情同意权过度解读,引出了医生在履行告知义务时的合理边界问题。通过以患者知情同意权为切入点,探讨如何正确行使知情同意权,辨析医师告知义务的合理边界,为完善履行医师告知义务提供了对策和建议。

关键词：知情同意权医师告知义务 “激素治疗”案

Fossil Equidae in the Linxia Basin with Biostratigraphic and Paleozoogeographic Significance

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Acta Geologica Sinica(English Edition) 2024年第1期98卷 1-9页

作者： sun Boyang Key Laboratory of Vertebrate Evolution and Human Origins of the Chinese Academy of Sciences Institute of Vertebrate Paleontology and PaleoanthropologyChinese Academy of SciencesBeijing 100044China

The Linxia Basin is characterized by an abundance of Cenozoic sediments,that contain exceptionally rich fossil *** are abundant in the Linxia Basin,the fossil record of equids in this region including 16 species that represent 10 *** comparison to other classic late Cenozoic areas in China,the Linxia Basin stands out,because the fauna and chronological data accompanying Linxia equids render them remarkably useful for *** anchitheriines in the region,such as Anchitherium and Sinohippus,represent early equids that appeared in the late stages of the middle and late Miocene,*** the equines,most species of Chinese hipparions have been identified in the Linxia Basin and some species of the genera Hipparion and Hippotherium have FAD records for ***,Equus eisenmannae is one of the earliest known species of Equus in the Old World and is well-represented at the Longdan *** species with precise geohistorical distributions can serve as standards for high-resolution chronological units within this *** at the eastern margin of the Tibetan Plateau and subject to considerable uplift,the Linxia Basin has served as a biogeographic transition area for equids throughout the late Cenozoic.

关键词： Equidae Cenozoic biostratigraphy paleozoogeography Linxia Basin