The hydrodynamic characteristics of heave plates with different form edges of Truss Spar Platform are studied in this paper. Numerical simulations are carried out for the plate forced oscillation by the dynamic mesh m...The hydrodynamic characteristics of heave plates with different form edges of Truss Spar Platform are studied in this paper. Numerical simulations are carried out for the plate forced oscillation by the dynamic mesh method and user defined fimctions of FLUENT. The added mass coefficient Cm and the damping coefficient Cd of heave plate with tapering condition and the chamfer condition are calculated. The results show that, in a certain range, the hydrodynamic performance of heave plate after being tapered is better.展开更多
This paper deals with indirect effects of major impacting throughout the Early Paleozoic resp. with those of super plume activity during the Early Cretaceous, both applied to the siliciclastic series of Jordan deposit...This paper deals with indirect effects of major impacting throughout the Early Paleozoic resp. with those of super plume activity during the Early Cretaceous, both applied to the siliciclastic series of Jordan deposited on the Arabian Platform, Arabian Plate. Its focus is mainly directed on gases released by both processes (CO2, SO2, NOx, HCl, HF) and the relating acids, challenged by experiments and microscopic analysis of grain mounts and thin sections that reveal chemical instability of quartz and ultrastable heavy minerals (i.e. tourmaline) under high acidity (pH °C - 90°C). According to Lopatin’s Time/Temperatur-Index the Lower Cambrian reached the onset of hydrocarbon generation (liquid window) during the Lower Early Cretaceous. Unstable heavy minerals (apatite, garnet, hornblende, epidote, zoisite/clinozoisite) are generally absent in quartz arenites while in arkosic sandstones of marine environment carbonate cement and primary clay minerals (illite) provide conservation. As known since the eighties, the K/T-event’s indirect effects had global influence on Earth’s surface sediments and atmospheric chemistry by wildfires, hot whirl storms, acidic “sturz rain”, dust, soot, darkness, loss of photosynthesis, toxic metals, gases and relating acids. All of them are here concerned and applied to major impacting throughout the Early Paleozoic using the impact data of Price (2001);while superplume volcanism during Cretaceous led to the opening of the South Atlantic accompanied by the cyclic outflow of the Para?a/Etendeka Flood Basalts and relating gases in a gigantic scale (137 - 127 Ma). Assuming that the gases cause similar global effects on Earth’s surface sediments, an according result may be expected in form of quartz arenites and their sequence-analytical patterns (cyclic SBs, MFSs).*展开更多
钢材碳排放因子是建筑碳排放核算的重要基础,目前相关标准和文献给出的钢材碳排放因子取值变异性较大,且未考虑钢铁工业发展的时效性。调研了国内10家典型高炉-转炉钢铁企业生产清单数据,以及中国钢铁工业协会统计年报数据,构建了近5年...钢材碳排放因子是建筑碳排放核算的重要基础,目前相关标准和文献给出的钢材碳排放因子取值变异性较大,且未考虑钢铁工业发展的时效性。调研了国内10家典型高炉-转炉钢铁企业生产清单数据,以及中国钢铁工业协会统计年报数据,构建了近5年结构钢材产品的物料、能源清单数据库。基于投入产出法,核算了10家典型钢铁企业的钢材产品及中国钢铁工业协会统计年报的碳排放因子,结合钢铁行业EPD平台发布的相关数据,形成了钢筋、型钢、钢板和通用钢材的碳排放因子数据样本及统计参数。在此基础上,针对钢结构常用的钢铁产品如钢筋、型钢和钢板提出了碳排放因子取值建议,主要结论如下:1)钢筋、型钢和钢板的碳排放因子建议值分别取2150、2260、2240 kg CO_(2)e/t。2)所核算的钢筋、型钢和钢板碳排放因子较GB/T 51366—2019《建筑碳排放计算标准》相应取值分别低190、105、160 kg CO_(2)e/t,表明近5年来钢筋、型钢和钢板的生产取得了一定减碳效果。3)与2004年文献发布的碳排放因子相比,所核算的钢筋、型钢和钢板碳排放因子降幅均超过1300 kg CO_(2)e/t,表明我国近20年来结构钢材绿色低碳化发展取得了显著成效。展开更多
基金supported by the National Natural Science Foundation of China (Grant Nos. 51079097 and 50879057)Science Fund for Creative Research Groups of the National Natural Science Foundation of China (Grant No. 51021004)
文摘The hydrodynamic characteristics of heave plates with different form edges of Truss Spar Platform are studied in this paper. Numerical simulations are carried out for the plate forced oscillation by the dynamic mesh method and user defined fimctions of FLUENT. The added mass coefficient Cm and the damping coefficient Cd of heave plate with tapering condition and the chamfer condition are calculated. The results show that, in a certain range, the hydrodynamic performance of heave plate after being tapered is better.
文摘This paper deals with indirect effects of major impacting throughout the Early Paleozoic resp. with those of super plume activity during the Early Cretaceous, both applied to the siliciclastic series of Jordan deposited on the Arabian Platform, Arabian Plate. Its focus is mainly directed on gases released by both processes (CO2, SO2, NOx, HCl, HF) and the relating acids, challenged by experiments and microscopic analysis of grain mounts and thin sections that reveal chemical instability of quartz and ultrastable heavy minerals (i.e. tourmaline) under high acidity (pH °C - 90°C). According to Lopatin’s Time/Temperatur-Index the Lower Cambrian reached the onset of hydrocarbon generation (liquid window) during the Lower Early Cretaceous. Unstable heavy minerals (apatite, garnet, hornblende, epidote, zoisite/clinozoisite) are generally absent in quartz arenites while in arkosic sandstones of marine environment carbonate cement and primary clay minerals (illite) provide conservation. As known since the eighties, the K/T-event’s indirect effects had global influence on Earth’s surface sediments and atmospheric chemistry by wildfires, hot whirl storms, acidic “sturz rain”, dust, soot, darkness, loss of photosynthesis, toxic metals, gases and relating acids. All of them are here concerned and applied to major impacting throughout the Early Paleozoic using the impact data of Price (2001);while superplume volcanism during Cretaceous led to the opening of the South Atlantic accompanied by the cyclic outflow of the Para?a/Etendeka Flood Basalts and relating gases in a gigantic scale (137 - 127 Ma). Assuming that the gases cause similar global effects on Earth’s surface sediments, an according result may be expected in form of quartz arenites and their sequence-analytical patterns (cyclic SBs, MFSs).*
文摘钢材碳排放因子是建筑碳排放核算的重要基础,目前相关标准和文献给出的钢材碳排放因子取值变异性较大,且未考虑钢铁工业发展的时效性。调研了国内10家典型高炉-转炉钢铁企业生产清单数据,以及中国钢铁工业协会统计年报数据,构建了近5年结构钢材产品的物料、能源清单数据库。基于投入产出法,核算了10家典型钢铁企业的钢材产品及中国钢铁工业协会统计年报的碳排放因子,结合钢铁行业EPD平台发布的相关数据,形成了钢筋、型钢、钢板和通用钢材的碳排放因子数据样本及统计参数。在此基础上,针对钢结构常用的钢铁产品如钢筋、型钢和钢板提出了碳排放因子取值建议,主要结论如下:1)钢筋、型钢和钢板的碳排放因子建议值分别取2150、2260、2240 kg CO_(2)e/t。2)所核算的钢筋、型钢和钢板碳排放因子较GB/T 51366—2019《建筑碳排放计算标准》相应取值分别低190、105、160 kg CO_(2)e/t,表明近5年来钢筋、型钢和钢板的生产取得了一定减碳效果。3)与2004年文献发布的碳排放因子相比,所核算的钢筋、型钢和钢板碳排放因子降幅均超过1300 kg CO_(2)e/t,表明我国近20年来结构钢材绿色低碳化发展取得了显著成效。
