Recent exploration has highlighted the critical role of strike-slip faults in shaping ultra-deep carbonate reservoirs in the Tarim Basin.This study integrates satellite imagery,UAV photogrammetry,outcrop surveys and m...Recent exploration has highlighted the critical role of strike-slip faults in shaping ultra-deep carbonate reservoirs in the Tarim Basin.This study integrates satellite imagery,UAV photogrammetry,outcrop surveys and microscopic analysis to investigate the architecture of these faults and their impact on reservoir petrophysical properties.The strike-slip faults exhibit cores consisting of calcite bands,fault breccias and fractures,while the damage zones are predominantly fractured.Thicker fault cores and fault zones are associated with more extensive reservoir development.Individual strike-slip fault zones are primarily characterized by two sets of fractures intersecting the fault at small angles.When two fault systems interact,the dominant pattern is two sets of fractures intersecting the main fault at small angles and one set at larger angles,facilitating the formation of large-scale reservoirs.We propose a model for the fault core,which primarily consists of a calcite band and fault breccias.These breccias are composed of original host rock,calcite cement and quartz,which exhibit poor physical properties,while fractures and vugs show favorable reservoir characteristics.This model offers valuable insights into the development of fault-controlled reservoirs,particularly in the Tarim Basin.展开更多
TiC/Ti_(2)AlC core-shell structure reinforced Ti-based composite coating was prepared by laser cladding technology.The effect of Ti_(2)AlC content on the microstructure and mechanical behavior of the coating was studi...TiC/Ti_(2)AlC core-shell structure reinforced Ti-based composite coating was prepared by laser cladding technology.The effect of Ti_(2)AlC content on the microstructure and mechanical behavior of the coating was studied.The results showed that the reinforced phase was mainly TiC/Ti_(2)AlC MAX phase core-shell structure at 20%Ti_(2)AlC content.According to the synthesis mechanism,Ti_(2)AlC nucleated on TiC through the diffusion of Al atoms to further generate the core-shell structure.The friction and wear test results showed that the wear resistance of the coating was significantly improved under the load distribution effect of the core-shell structure.The friction coefficient decreased to 0.342,and the wear rate reached 8.19×10^(−5)mm^(3)/(N·m),which was only 47.07%of TC4 substrate.展开更多
目的评估泛免疫炎症值(pan-immune-inflammation value,PIV)对抑郁状态人群中全因和特定原因死亡率的预测价值。方法本研究为一项前瞻性队列研究,数据来自美国2005—2018年国家健康和营养检查调查(National Health and Nutrition Examin...目的评估泛免疫炎症值(pan-immune-inflammation value,PIV)对抑郁状态人群中全因和特定原因死亡率的预测价值。方法本研究为一项前瞻性队列研究,数据来自美国2005—2018年国家健康和营养检查调查(National Health and Nutrition Examination Survey,NHANES)和2005—2019年国家死亡指数(National Death Index,NDI)。共纳入了8567名参与者。参与者按PIV四分位数分组(Q1、Q2、Q3、Q4)或按二分位数分组(low组、high组),采用Cox比例风险模型评估PIV与抑郁人群全因死亡率、心血管死亡率和癌症死亡率的相关性;通过平滑曲线拟合探讨非线性剂量反应关系,经阈值效应分析确定拐点后,以拐点为界,将参与者分为2组,并构建分段回归模型并结合Kaplan-Meier生存曲线探究PIV与节段生存状态之间的关系。亚组分析探讨了PIV与死亡率关联的稳定性。结果Cox结果显示,较高的PIV水平与全因死亡率(HR=1.05,95%CI:1.04~1.07,P<0.001)、心血管死亡率(HR=1.07,95%CI:1.05~1.10,P<0.001)和癌症死亡率(HR=1.05,95%CI:1.01~1.08,P<0.001)增加显著相关。平滑曲线拟合结果显示,PIV与全因死亡率之间存在U型关系,拐点为80.97(P<0.05)。生存分析显示:当PIV>80.97时,与low组相比,high组的全因死亡率(HR=1.29,95%CI:1.12~1.48,P<0.001)升高;与Q1组相比,Q4组的全因死亡率(HR=1.53,95%CI:1.25~1.87,P<0.001)升高。亚组分析结果显示,在女性人群中PIV与全因死亡率(HR=1.08,95%CI:1.05~1.10,P=0.038)和心血管死亡率(HR=1.11,95%CI:1.07~1.16,P=0.031)的关联更强;患有糖尿病以及其他种族(除墨西哥裔美国人、其他西班牙裔、非西班牙裔白人、非西班牙裔黑人之外)人群的PIV与全因死亡率[糖尿病(HR=1.09,95%CI:1.06~1.10,P=0.023)其他种族(HR=1.22,95%CI:1.11~1.35,P=0.032)]和癌症死亡率[糖尿病(HR=1.12,95%CI:1.06~1.18,P=0.006)、其他种族(HR=2.00,95%CI:1.79~2.24,P=0.002)]的关联更强。结论PIV升高是抑郁状态人群多种死亡结局的独立危险因素。本研究明确PIV作为死亡风险预测生物标志物的潜力,对高危人群早期识别、精准管理及疾病负担的全面降低提供重要依据。展开更多
The flocculating activity of a novel bioflocculant MMF1 produced by multiple-microorganism consortia MM1 was investigated. MM1 was composed of strain BAFRT4 identified as Staphylococcus sp. and strain CYGS1 identified...The flocculating activity of a novel bioflocculant MMF1 produced by multiple-microorganism consortia MM1 was investigated. MM1 was composed of strain BAFRT4 identified as Staphylococcus sp. and strain CYGS1 identified as Pseudomonas sp. The flocculating activity of MMF1 isolated from the screening medium was 82.9%, which is remarkably higher than that of the bioflocculant produced by either of the strains under the same condition. Brewery wastewater was also used as the carbon source for MM1, and the cost-effective production medium for MM1 mainly comprised 1.0 L brewery water （chemical oxygen demand （COD） 5000 mg/L）, 0.5 g/L urea, 0.5 g/L yeast extract, and 0.2 g/L （NH4）2SO4. The optimal conditions for the production of MMF1 was inoculum size 2%, initial pH 6.0, cultivating temperature 30℃, and shaking speed 160 r/min, under which the flocculating activity of the MMF1 reached 96.8%. Fifteen grams of purified bioflocculant could be recovered from 1.0 L of fermentation broth. MMF1 was identified as a macromolecular substance containing both protein and polysaccharide. It showed good flocculating performance in treating indigotin printing and dyeing wastewater, and the maximal removal efficiencies of COD and chroma were 79.2% and 86.5%, respectively.展开更多
随着新能源的快速发展,光伏发电装机容量和光伏电站逐年增加。但由于存在静止无功补偿器(static var generators,SVG)以及光伏逆变器等电力电子设备,使得光伏电站的高频振荡问题十分复杂。针对国内某光伏电站多次出现高频振荡现象,基于...随着新能源的快速发展,光伏发电装机容量和光伏电站逐年增加。但由于存在静止无功补偿器(static var generators,SVG)以及光伏逆变器等电力电子设备,使得光伏电站的高频振荡问题十分复杂。针对国内某光伏电站多次出现高频振荡现象,基于该电站各部件的谐波模型建立了含SVG的光伏电站及外部电网谐波节点导纳矩阵,并通过模态分析法分析了其模态阻抗和模态频率,进一步通过节点参与因子以及模态灵敏度参数揭示了元件对高频谐振的影响情况,仿真结果与现场高频振荡现象相同。最后,提出了阻抗-频率指标和C型滤波器的高频谐振治理方法。模态分析结果表明,所提方法可以有效抑制高频振荡并降低其他潜在的高频谐振危害。展开更多
This review addresses four key themes in automotive aerodynamics:flow instability in the wheel region,the aerodynamic characteristics of rims,the aerodynamic behavior of tires,and drag reduction strategies based on fl...This review addresses four key themes in automotive aerodynamics:flow instability in the wheel region,the aerodynamic characteristics of rims,the aerodynamic behavior of tires,and drag reduction strategies based on flow control around the wheels.The wheel region,comprising the tire,rim,and adjacent aerodynamic components,typically represents the major source of vehicle drag owing to the inherently complex flow generated by wheel rotation,tread geometry,and rim design,which gives rise to flow separation,vortex shedding,and turbulence.Drawing on a broad body of experimental and numerical research,this review elucidates the mechanisms governing such dynamics,and considers drag mitigation techniques,including biomimetic surface treatments and multi-element flow control concepts.Particular emphasis is placed on enclosed-spoke rims,rim-edge enclosures,and non-smooth tire microstructures,which have consistently demonstrated notable drag reduction potential.The review further identifies critical shortcomings in current research,most notably the lack of quantitative analyses of aerodynamic energy losses and the absence of integrated optimization strategies that jointly address tire,rim,and fender design.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.U21B2062).
文摘Recent exploration has highlighted the critical role of strike-slip faults in shaping ultra-deep carbonate reservoirs in the Tarim Basin.This study integrates satellite imagery,UAV photogrammetry,outcrop surveys and microscopic analysis to investigate the architecture of these faults and their impact on reservoir petrophysical properties.The strike-slip faults exhibit cores consisting of calcite bands,fault breccias and fractures,while the damage zones are predominantly fractured.Thicker fault cores and fault zones are associated with more extensive reservoir development.Individual strike-slip fault zones are primarily characterized by two sets of fractures intersecting the fault at small angles.When two fault systems interact,the dominant pattern is two sets of fractures intersecting the main fault at small angles and one set at larger angles,facilitating the formation of large-scale reservoirs.We propose a model for the fault core,which primarily consists of a calcite band and fault breccias.These breccias are composed of original host rock,calcite cement and quartz,which exhibit poor physical properties,while fractures and vugs show favorable reservoir characteristics.This model offers valuable insights into the development of fault-controlled reservoirs,particularly in the Tarim Basin.
基金Project(52365020) supported by the National Natural Science Foundation of ChinaProject([2022]06) supported by the Special Fund for Special Posts of Guizhou University,China+2 种基金Project([2024]03) supported by the Guizhou University Fund,ChinaProject(ZK[2023]78) supported by the Guizhou Provincial Basic Research Program(Natural Science),ChinaProject(BQW[2024]011) supported by the Guizhou Province Science and Technology Foundation,China。
文摘TiC/Ti_(2)AlC core-shell structure reinforced Ti-based composite coating was prepared by laser cladding technology.The effect of Ti_(2)AlC content on the microstructure and mechanical behavior of the coating was studied.The results showed that the reinforced phase was mainly TiC/Ti_(2)AlC MAX phase core-shell structure at 20%Ti_(2)AlC content.According to the synthesis mechanism,Ti_(2)AlC nucleated on TiC through the diffusion of Al atoms to further generate the core-shell structure.The friction and wear test results showed that the wear resistance of the coating was significantly improved under the load distribution effect of the core-shell structure.The friction coefficient decreased to 0.342,and the wear rate reached 8.19×10^(−5)mm^(3)/(N·m),which was only 47.07%of TC4 substrate.
文摘目的评估泛免疫炎症值(pan-immune-inflammation value,PIV)对抑郁状态人群中全因和特定原因死亡率的预测价值。方法本研究为一项前瞻性队列研究,数据来自美国2005—2018年国家健康和营养检查调查(National Health and Nutrition Examination Survey,NHANES)和2005—2019年国家死亡指数(National Death Index,NDI)。共纳入了8567名参与者。参与者按PIV四分位数分组(Q1、Q2、Q3、Q4)或按二分位数分组(low组、high组),采用Cox比例风险模型评估PIV与抑郁人群全因死亡率、心血管死亡率和癌症死亡率的相关性;通过平滑曲线拟合探讨非线性剂量反应关系,经阈值效应分析确定拐点后,以拐点为界,将参与者分为2组,并构建分段回归模型并结合Kaplan-Meier生存曲线探究PIV与节段生存状态之间的关系。亚组分析探讨了PIV与死亡率关联的稳定性。结果Cox结果显示,较高的PIV水平与全因死亡率(HR=1.05,95%CI:1.04~1.07,P<0.001)、心血管死亡率(HR=1.07,95%CI:1.05~1.10,P<0.001)和癌症死亡率(HR=1.05,95%CI:1.01~1.08,P<0.001)增加显著相关。平滑曲线拟合结果显示,PIV与全因死亡率之间存在U型关系,拐点为80.97(P<0.05)。生存分析显示:当PIV>80.97时,与low组相比,high组的全因死亡率(HR=1.29,95%CI:1.12~1.48,P<0.001)升高;与Q1组相比,Q4组的全因死亡率(HR=1.53,95%CI:1.25~1.87,P<0.001)升高。亚组分析结果显示,在女性人群中PIV与全因死亡率(HR=1.08,95%CI:1.05~1.10,P=0.038)和心血管死亡率(HR=1.11,95%CI:1.07~1.16,P=0.031)的关联更强;患有糖尿病以及其他种族(除墨西哥裔美国人、其他西班牙裔、非西班牙裔白人、非西班牙裔黑人之外)人群的PIV与全因死亡率[糖尿病(HR=1.09,95%CI:1.06~1.10,P=0.023)其他种族(HR=1.22,95%CI:1.11~1.35,P=0.032)]和癌症死亡率[糖尿病(HR=1.12,95%CI:1.06~1.18,P=0.006)、其他种族(HR=2.00,95%CI:1.79~2.24,P=0.002)]的关联更强。结论PIV升高是抑郁状态人群多种死亡结局的独立危险因素。本研究明确PIV作为死亡风险预测生物标志物的潜力,对高危人群早期识别、精准管理及疾病负担的全面降低提供重要依据。
基金Project supported by the Specialized Research Fund for the Doctoral Program of Higher Education(No.20050247016)the Program forNew Century Excellent Talents in University(NCET-05-0387).
文摘The flocculating activity of a novel bioflocculant MMF1 produced by multiple-microorganism consortia MM1 was investigated. MM1 was composed of strain BAFRT4 identified as Staphylococcus sp. and strain CYGS1 identified as Pseudomonas sp. The flocculating activity of MMF1 isolated from the screening medium was 82.9%, which is remarkably higher than that of the bioflocculant produced by either of the strains under the same condition. Brewery wastewater was also used as the carbon source for MM1, and the cost-effective production medium for MM1 mainly comprised 1.0 L brewery water （chemical oxygen demand （COD） 5000 mg/L）, 0.5 g/L urea, 0.5 g/L yeast extract, and 0.2 g/L （NH4）2SO4. The optimal conditions for the production of MMF1 was inoculum size 2%, initial pH 6.0, cultivating temperature 30℃, and shaking speed 160 r/min, under which the flocculating activity of the MMF1 reached 96.8%. Fifteen grams of purified bioflocculant could be recovered from 1.0 L of fermentation broth. MMF1 was identified as a macromolecular substance containing both protein and polysaccharide. It showed good flocculating performance in treating indigotin printing and dyeing wastewater, and the maximal removal efficiencies of COD and chroma were 79.2% and 86.5%, respectively.
文摘随着新能源的快速发展,光伏发电装机容量和光伏电站逐年增加。但由于存在静止无功补偿器(static var generators,SVG)以及光伏逆变器等电力电子设备,使得光伏电站的高频振荡问题十分复杂。针对国内某光伏电站多次出现高频振荡现象,基于该电站各部件的谐波模型建立了含SVG的光伏电站及外部电网谐波节点导纳矩阵,并通过模态分析法分析了其模态阻抗和模态频率,进一步通过节点参与因子以及模态灵敏度参数揭示了元件对高频谐振的影响情况,仿真结果与现场高频振荡现象相同。最后,提出了阻抗-频率指标和C型滤波器的高频谐振治理方法。模态分析结果表明,所提方法可以有效抑制高频振荡并降低其他潜在的高频谐振危害。
基金funded by the National Natural Science Foundation of China,grant numbers 52072156,52272366the Postdoctoral Foundation of China,grant number 2020M682269.
文摘This review addresses four key themes in automotive aerodynamics:flow instability in the wheel region,the aerodynamic characteristics of rims,the aerodynamic behavior of tires,and drag reduction strategies based on flow control around the wheels.The wheel region,comprising the tire,rim,and adjacent aerodynamic components,typically represents the major source of vehicle drag owing to the inherently complex flow generated by wheel rotation,tread geometry,and rim design,which gives rise to flow separation,vortex shedding,and turbulence.Drawing on a broad body of experimental and numerical research,this review elucidates the mechanisms governing such dynamics,and considers drag mitigation techniques,including biomimetic surface treatments and multi-element flow control concepts.Particular emphasis is placed on enclosed-spoke rims,rim-edge enclosures,and non-smooth tire microstructures,which have consistently demonstrated notable drag reduction potential.The review further identifies critical shortcomings in current research,most notably the lack of quantitative analyses of aerodynamic energy losses and the absence of integrated optimization strategies that jointly address tire,rim,and fender design.
