As the core information infrastructure of modern information warfare,the offensive and defensive confrontations of satellite navigation systems have given rise to navigation warfare,which focuses on seizing control of...As the core information infrastructure of modern information warfare,the offensive and defensive confrontations of satellite navigation systems have given rise to navigation warfare,which focuses on seizing control of navigation resources.Based on the space segment,control segment,and user segment of satellite navigation systems,this paper systematically constructs an offensive-defensive technology system for navigation warfare,and deeply analyzes core measures such as signal enhancement and suppression,autonomous navigation and link jamming,anti-jamming reception,and integrated navigation.It extracts key technologies including adaptive nulling antennas,joint filtering,and multi-dimensional combined jamming,and discusses the technical effectiveness of these technologies by incorporating relevant cases.The advantages of navigation warfare stem from multi-segment coordination and technological inte-gration.In the future,the development directions of navigation warfare will focus on three aspects:enhancing satellite capabilities,tackling core technical challenges,and building a multi-dimensional system.展开更多
[目的]探讨基于MRI的肩胛下肌腱形态对冻结肩的诊断价值。[方法]回顾性分析2020年1月-2023年6月因肩痛在本院就诊的患者资料。按冻结肩诊断标准将患者为冻结肩组(48例)和非冻结肩组(50例)。比较两组影像测量结果。并通过受试者工作特性...[目的]探讨基于MRI的肩胛下肌腱形态对冻结肩的诊断价值。[方法]回顾性分析2020年1月-2023年6月因肩痛在本院就诊的患者资料。按冻结肩诊断标准将患者为冻结肩组(48例)和非冻结肩组(50例)。比较两组影像测量结果。并通过受试者工作特性曲线(receiver operating characteristic,ROC)分析影像指标对冻结肩的诊断价值。[结果]冻结肩组的肩胛下肌腱厚度(subscapularis tendon thickness,SScTT)[(4.9±0.6) mm vs (3.8±0.4) mm,P<0.001]、横截面积(the cross sectional area o subscapularis tendon,SScT-CSA)[(69.3±27.8) mm2vs (37.9±12.5) mm2,P<0.001]、SScT-CSA/SSc-CSA[(0.3±0.1) vs (0.1±0.0),P<0.001]显著大于非冻结肩组,肩胛下肌的信号值[(59.5±8.3) vs (74.7±7.4),P=0.040]显著小于非冻结肩组。SScTT(AUC=0.900)和SScT-CSA/SSc-CSA(AUC=0.915)对冻结肩均具有高诊断价值。[结论]肩胛下肌腱的厚度以及腱-肌横截面积比能间接反映肩胛下肌腱的纤维化,可以作为冻结肩MRI诊断的新参考指标。展开更多
The exploration direction and targets for the large-scale Middle Permian gas reservoirs in the Sichuan Basin are hot spots and challenges in current exploration researches.The exploration successes of large gas field ...The exploration direction and targets for the large-scale Middle Permian gas reservoirs in the Sichuan Basin are hot spots and challenges in current exploration researches.The exploration successes of large gas field of Cambrian Longwangmiao Formation in Gaoshiti-Moxi region,Central Sichuan Basin,indicated that prospective sedimentary facies belt was the basis for the formation of large gas fields.In this paper,based on seismic data,outcrop data and drilling data,the tectonic framework and sedimentary features of the Middle Permian in the SW Sichuan Basin were comprehensively studied.The following conclusions were reached from the perspective of sedimentary facies control:(1)during the Middle Permian,this region was in shallow water gentle slope belts with high energy,where thick reef flat facies were deposited;(2)the basement was uplifted during Middle Permian,resulting in the unconformity weathering crust at the top of Maokou Formation due to erosion;the SW Sichuan Basin was located in the karst slope belt,where epigenic karstification was intense;and(3)reef flat deposits superimposed by karst weathering crust was favorable for the formation of large-scale reef flat karst reservoirs.Based on the combination of the resources conditions and hydrocarbon accumulation conditions in this region,it was pointed out that the Middle Permian has great potential of large-scale reef flat karst gas reservoir due to its advantageous geological conditions;the Middle Permian traps with good hydrocarbon accumulation conditions were developed in the Longmen Mountain front closed structural belt in the SW Sichuan Basin andWestern Sichuan Basin depression slope belt,which are favorable targets for large-scale reef flat karst reservoirs.展开更多
文摘As the core information infrastructure of modern information warfare,the offensive and defensive confrontations of satellite navigation systems have given rise to navigation warfare,which focuses on seizing control of navigation resources.Based on the space segment,control segment,and user segment of satellite navigation systems,this paper systematically constructs an offensive-defensive technology system for navigation warfare,and deeply analyzes core measures such as signal enhancement and suppression,autonomous navigation and link jamming,anti-jamming reception,and integrated navigation.It extracts key technologies including adaptive nulling antennas,joint filtering,and multi-dimensional combined jamming,and discusses the technical effectiveness of these technologies by incorporating relevant cases.The advantages of navigation warfare stem from multi-segment coordination and technological inte-gration.In the future,the development directions of navigation warfare will focus on three aspects:enhancing satellite capabilities,tackling core technical challenges,and building a multi-dimensional system.
文摘[目的]探讨基于MRI的肩胛下肌腱形态对冻结肩的诊断价值。[方法]回顾性分析2020年1月-2023年6月因肩痛在本院就诊的患者资料。按冻结肩诊断标准将患者为冻结肩组(48例)和非冻结肩组(50例)。比较两组影像测量结果。并通过受试者工作特性曲线(receiver operating characteristic,ROC)分析影像指标对冻结肩的诊断价值。[结果]冻结肩组的肩胛下肌腱厚度(subscapularis tendon thickness,SScTT)[(4.9±0.6) mm vs (3.8±0.4) mm,P<0.001]、横截面积(the cross sectional area o subscapularis tendon,SScT-CSA)[(69.3±27.8) mm2vs (37.9±12.5) mm2,P<0.001]、SScT-CSA/SSc-CSA[(0.3±0.1) vs (0.1±0.0),P<0.001]显著大于非冻结肩组,肩胛下肌的信号值[(59.5±8.3) vs (74.7±7.4),P=0.040]显著小于非冻结肩组。SScTT(AUC=0.900)和SScT-CSA/SSc-CSA(AUC=0.915)对冻结肩均具有高诊断价值。[结论]肩胛下肌腱的厚度以及腱-肌横截面积比能间接反映肩胛下肌腱的纤维化,可以作为冻结肩MRI诊断的新参考指标。
文摘The exploration direction and targets for the large-scale Middle Permian gas reservoirs in the Sichuan Basin are hot spots and challenges in current exploration researches.The exploration successes of large gas field of Cambrian Longwangmiao Formation in Gaoshiti-Moxi region,Central Sichuan Basin,indicated that prospective sedimentary facies belt was the basis for the formation of large gas fields.In this paper,based on seismic data,outcrop data and drilling data,the tectonic framework and sedimentary features of the Middle Permian in the SW Sichuan Basin were comprehensively studied.The following conclusions were reached from the perspective of sedimentary facies control:(1)during the Middle Permian,this region was in shallow water gentle slope belts with high energy,where thick reef flat facies were deposited;(2)the basement was uplifted during Middle Permian,resulting in the unconformity weathering crust at the top of Maokou Formation due to erosion;the SW Sichuan Basin was located in the karst slope belt,where epigenic karstification was intense;and(3)reef flat deposits superimposed by karst weathering crust was favorable for the formation of large-scale reef flat karst reservoirs.Based on the combination of the resources conditions and hydrocarbon accumulation conditions in this region,it was pointed out that the Middle Permian has great potential of large-scale reef flat karst gas reservoir due to its advantageous geological conditions;the Middle Permian traps with good hydrocarbon accumulation conditions were developed in the Longmen Mountain front closed structural belt in the SW Sichuan Basin andWestern Sichuan Basin depression slope belt,which are favorable targets for large-scale reef flat karst reservoirs.
