The hydrodynamic conditions present in a river delta's formation are a highly important factor in the variation between its sedimentary regulation and characteristics. In the case of the lacustrine basin river-dom...The hydrodynamic conditions present in a river delta's formation are a highly important factor in the variation between its sedimentary regulation and characteristics. In the case of the lacustrine basin river-dominated delta, water level fluctuations and fluviation, are both important controlling factors of the sedimentary characteristics and reservoir architecture. To discuss the effects of water level fluctuation on sediment characteristics and reservoir architecture of this delta, the Fangniugou section in the east of the Songliao Basin was selected for study. Based on an outcrop investigation of the lacustrine basin river-dominated delta, combining with an analysis of the major and trace chemical elements in the sediments to determine the relative water depth, through architecture bounding surfaces and lithofacies division, sedimentary microfacies recognition and architectural element research, this work illustrated the effects of water level fluctuation on the reservoir architecture and established sedimentary models for the lacustrine basin river-dominated delta under various water level conditions. The results show that there are 8 lithofacies in the Fangniugou section. The fan delta front, which is the main object of this study, develops four sedimentary microfacies that include the underwater distributary channel, river mouth bar, sheet sand and interdistributary bay. The effects of water level fluctuation on different orders geographic architecture elements are respectively reflected in the vertical combination of the composite sand bodies, the plane combination of the single sand bodies, the particle size changes in the vertical of hyperplasia in the single sand body, the coset and lamina. In the case of the sand body development of the petroliferous basin, varying water level conditions and research locations resulted in significant variation in the distribution and combination of the sand bodies in the lacustrine basin.展开更多
Dominant technology formation is the key for the hightech industry to“cross the chasm”and gain an established foothold in the market(and hence disrupt the regime).Therefore,a stimulus-response model is proposed to i...Dominant technology formation is the key for the hightech industry to“cross the chasm”and gain an established foothold in the market(and hence disrupt the regime).Therefore,a stimulus-response model is proposed to investigate the dominant technology by exploring its formation process and mechanism.Specifically,based on complex adaptive system theory and the basic stimulus-response model,we use a combination of agent-based modeling and system dynamics modeling to capture the interactions between dominant technology and the socio-technical landscape.The results indicate the following:(i)The dynamic interaction is“stimulus-reaction-selection”,which promotes the dominant technology’s formation.(ii)The dominant technology’s formation can be described as a dynamic process in which the adaptation intensity of technology standards increases continuously until it becomes the leading technology under the dual action of internal and external mechanisms.(iii)The dominant technology’s formation in the high-tech industry is influenced by learning ability,the number of adopting users and adaptability.Therein,a“critical scale”of learning ability exists to promote the formation of leading technology:a large number of adopting users can promote the dominant technology’s formation by influencing the adaptive response of technology standards to the socio-technical landscape and the choice of technology standards by the socio-technical landscape.There is a minimum threshold and a maximum threshold for the role of adaptability in the dominant technology’s formation.(iv)The socio-technical landscape can promote the leading technology’s shaping in the high-tech industry,and different elements have different effects.This study promotes research on the formation mechanism of dominant technology in the high-tech industry,presents new perspectives and methods for researchers,and provides essential enlightenment for managers to formulate technology strategies.展开更多
考虑到当前梯级水库蓄水调度研究尚未开展碳减排调度,基于碳排放因子法提出了梯级水库蓄水期水碳多目标调度模型,制定了梯级水库提前蓄水策略,并以防洪风险最小化、发电量最大化和温室气体排放量最小化为调度目标,采用NSGA-II求解调度...考虑到当前梯级水库蓄水调度研究尚未开展碳减排调度,基于碳排放因子法提出了梯级水库蓄水期水碳多目标调度模型,制定了梯级水库提前蓄水策略,并以防洪风险最小化、发电量最大化和温室气体排放量最小化为调度目标,采用NSGA-II求解调度模型推求了梯级水库蓄水期优化调度方案,在金沙江中下游6座水库与三峡水库组成的梯级水库开展了实例研究。结果表明:相较于现行调度方案,优化调度方案集在防洪库容占用率为0~4.92%的情况下,发电量提升了7.23~40.26亿kW·h/a(0.65%~3.60%),弃水量减少了15.82~55.03亿m^(3)/a(6.45%~22.43%),温室气体排放量降低了38.55~45.63 Gg CO_(2e)/a(8.33%~9.85%),碳排放强度降低了0.39~0.47 kg CO_(2e)/(MW·h)(9.49%~11.44%),显著提升了梯级水库的发电量、抗旱供水能力并减少了温室气体排放。研究成果为实现梯级水库蓄水期水碳协同调度提供了技术支撑。展开更多
目的:探讨强直性脊柱炎(ankylosing spondylitis,AS)胸腹部折叠畸形的CT影像学分型及评估方法。方法:回顾性分析2017年7月~2024年1月31例行胸腰椎CT检查的AS胸腰椎后凸畸形患者资料,男28例,女3例,平均年龄45.0±8.9岁。在胸腰椎CT...目的:探讨强直性脊柱炎(ankylosing spondylitis,AS)胸腹部折叠畸形的CT影像学分型及评估方法。方法:回顾性分析2017年7月~2024年1月31例行胸腰椎CT检查的AS胸腰椎后凸畸形患者资料,男28例,女3例,平均年龄45.0±8.9岁。在胸腰椎CT正中矢状面上测量胸腹折叠角(thoracoabdominal folded angle,TAFA)及剑突-耻骨联合距离(the distances between xiphoid process and superior edge of the pubis,XP),同时在脊柱全长侧位片上测量全脊椎后凸Cobb角(global kyphosis,GK)、胸椎后凸Cobb角(thoracic kyphosis,TK)、腰椎前凸Cobb角(lumbar lordosis,LL)及矢状面躯干偏移(sagittal vertical axis,SVA)。根据CT矢状面腰椎生理曲度对腹腔容积变化的影响创新性提出AS胸腹部折叠畸形的CT影像学分型,腰椎存在生理前凸时为Ⅰ型,腰椎生理曲度变直时为Ⅱ型,腰椎后凸畸形时为Ⅲ型。根据TAFA将Ⅲ型患者分为两个亚型,TAFA>90°为A亚型,TAFA≤90°为B亚型。由5名经过培训的脊柱外科医师先后对患者的临床资料进行独立评估与分型(间隔10d),采用Kendall′s W检验分析多组观察结果的一致性。采用单因素方差分析检验比较各型间上述测量参数的差异性。结果:31例患者中,胸腹部折叠畸形Ⅰ型5例、Ⅱ型8例、ⅢA型12例、ⅢB型6例。观察者间分型Kendall′s W一致性系数为0.954(P<0.001)。患者平均GK、TK、LL、SVA、TAFA及XP分别为83.7°±29.9°、48.7°±21.3°、-13.9°±25.3°、22.8±14.9cm、128.1°±50.5°及16.8±8.9cm;各组TAFA、XP测量数值间Kendall′s W一致性系数分别为0.946(P<0.001)和0.979(P<0.001);各分型间TAFA及XP两两比较均具有显著性差异(P<0.001)。结论:CT影像学分型可以客观评价AS胸腹部折叠畸形情况,剑突-耻骨联合距离及胸腹折叠角是评估AS胸腹部折叠畸形的重要指标。展开更多
基金Project(2011ZX05009-002)supported by the National Key Oil&Gas Project,ChinaProject(15CX06010A)supported by the Fundamental Research Funds for the Central Universities,China
文摘The hydrodynamic conditions present in a river delta's formation are a highly important factor in the variation between its sedimentary regulation and characteristics. In the case of the lacustrine basin river-dominated delta, water level fluctuations and fluviation, are both important controlling factors of the sedimentary characteristics and reservoir architecture. To discuss the effects of water level fluctuation on sediment characteristics and reservoir architecture of this delta, the Fangniugou section in the east of the Songliao Basin was selected for study. Based on an outcrop investigation of the lacustrine basin river-dominated delta, combining with an analysis of the major and trace chemical elements in the sediments to determine the relative water depth, through architecture bounding surfaces and lithofacies division, sedimentary microfacies recognition and architectural element research, this work illustrated the effects of water level fluctuation on the reservoir architecture and established sedimentary models for the lacustrine basin river-dominated delta under various water level conditions. The results show that there are 8 lithofacies in the Fangniugou section. The fan delta front, which is the main object of this study, develops four sedimentary microfacies that include the underwater distributary channel, river mouth bar, sheet sand and interdistributary bay. The effects of water level fluctuation on different orders geographic architecture elements are respectively reflected in the vertical combination of the composite sand bodies, the plane combination of the single sand bodies, the particle size changes in the vertical of hyperplasia in the single sand body, the coset and lamina. In the case of the sand body development of the petroliferous basin, varying water level conditions and research locations resulted in significant variation in the distribution and combination of the sand bodies in the lacustrine basin.
基金supported by the Shanghai Philosophy and Social Science Foundation(2022ECK004)Shanghai Soft Science Research Project(23692123400)。
文摘Dominant technology formation is the key for the hightech industry to“cross the chasm”and gain an established foothold in the market(and hence disrupt the regime).Therefore,a stimulus-response model is proposed to investigate the dominant technology by exploring its formation process and mechanism.Specifically,based on complex adaptive system theory and the basic stimulus-response model,we use a combination of agent-based modeling and system dynamics modeling to capture the interactions between dominant technology and the socio-technical landscape.The results indicate the following:(i)The dynamic interaction is“stimulus-reaction-selection”,which promotes the dominant technology’s formation.(ii)The dominant technology’s formation can be described as a dynamic process in which the adaptation intensity of technology standards increases continuously until it becomes the leading technology under the dual action of internal and external mechanisms.(iii)The dominant technology’s formation in the high-tech industry is influenced by learning ability,the number of adopting users and adaptability.Therein,a“critical scale”of learning ability exists to promote the formation of leading technology:a large number of adopting users can promote the dominant technology’s formation by influencing the adaptive response of technology standards to the socio-technical landscape and the choice of technology standards by the socio-technical landscape.There is a minimum threshold and a maximum threshold for the role of adaptability in the dominant technology’s formation.(iv)The socio-technical landscape can promote the leading technology’s shaping in the high-tech industry,and different elements have different effects.This study promotes research on the formation mechanism of dominant technology in the high-tech industry,presents new perspectives and methods for researchers,and provides essential enlightenment for managers to formulate technology strategies.
文摘考虑到当前梯级水库蓄水调度研究尚未开展碳减排调度,基于碳排放因子法提出了梯级水库蓄水期水碳多目标调度模型,制定了梯级水库提前蓄水策略,并以防洪风险最小化、发电量最大化和温室气体排放量最小化为调度目标,采用NSGA-II求解调度模型推求了梯级水库蓄水期优化调度方案,在金沙江中下游6座水库与三峡水库组成的梯级水库开展了实例研究。结果表明:相较于现行调度方案,优化调度方案集在防洪库容占用率为0~4.92%的情况下,发电量提升了7.23~40.26亿kW·h/a(0.65%~3.60%),弃水量减少了15.82~55.03亿m^(3)/a(6.45%~22.43%),温室气体排放量降低了38.55~45.63 Gg CO_(2e)/a(8.33%~9.85%),碳排放强度降低了0.39~0.47 kg CO_(2e)/(MW·h)(9.49%~11.44%),显著提升了梯级水库的发电量、抗旱供水能力并减少了温室气体排放。研究成果为实现梯级水库蓄水期水碳协同调度提供了技术支撑。
文摘目的:探讨强直性脊柱炎(ankylosing spondylitis,AS)胸腹部折叠畸形的CT影像学分型及评估方法。方法:回顾性分析2017年7月~2024年1月31例行胸腰椎CT检查的AS胸腰椎后凸畸形患者资料,男28例,女3例,平均年龄45.0±8.9岁。在胸腰椎CT正中矢状面上测量胸腹折叠角(thoracoabdominal folded angle,TAFA)及剑突-耻骨联合距离(the distances between xiphoid process and superior edge of the pubis,XP),同时在脊柱全长侧位片上测量全脊椎后凸Cobb角(global kyphosis,GK)、胸椎后凸Cobb角(thoracic kyphosis,TK)、腰椎前凸Cobb角(lumbar lordosis,LL)及矢状面躯干偏移(sagittal vertical axis,SVA)。根据CT矢状面腰椎生理曲度对腹腔容积变化的影响创新性提出AS胸腹部折叠畸形的CT影像学分型,腰椎存在生理前凸时为Ⅰ型,腰椎生理曲度变直时为Ⅱ型,腰椎后凸畸形时为Ⅲ型。根据TAFA将Ⅲ型患者分为两个亚型,TAFA>90°为A亚型,TAFA≤90°为B亚型。由5名经过培训的脊柱外科医师先后对患者的临床资料进行独立评估与分型(间隔10d),采用Kendall′s W检验分析多组观察结果的一致性。采用单因素方差分析检验比较各型间上述测量参数的差异性。结果:31例患者中,胸腹部折叠畸形Ⅰ型5例、Ⅱ型8例、ⅢA型12例、ⅢB型6例。观察者间分型Kendall′s W一致性系数为0.954(P<0.001)。患者平均GK、TK、LL、SVA、TAFA及XP分别为83.7°±29.9°、48.7°±21.3°、-13.9°±25.3°、22.8±14.9cm、128.1°±50.5°及16.8±8.9cm;各组TAFA、XP测量数值间Kendall′s W一致性系数分别为0.946(P<0.001)和0.979(P<0.001);各分型间TAFA及XP两两比较均具有显著性差异(P<0.001)。结论:CT影像学分型可以客观评价AS胸腹部折叠畸形情况,剑突-耻骨联合距离及胸腹折叠角是评估AS胸腹部折叠畸形的重要指标。
