A self-designed full-diameter core experimental facility was used to evaluate the flow heterogeneity of bedding fractures at four radial directions under different closure pressures and injection rates,using full-diam...A self-designed full-diameter core experimental facility was used to evaluate the flow heterogeneity of bedding fractures at four radial directions under different closure pressures and injection rates,using full-diameter cores retaining original natural bedding fractures.The distribution morphology of bedding surface affects the conductivity of bedding fractures,and the flow capacity of bedding fractures in four radial directions varies greatly with the closure pressure and injection rate.The rougher the fracture surface,the greater the flow capacity varies with the closure pressure.For unsupported bedding fractures,the mean percentage error(MPE)of the conductivity in four radial directions increase gradually with the increase of the closure pressure.This phenomenon is especially prominent in deep rock samples.It is indicated that the flow heterogeneity of bedding fractures tends to increase with the closure pressure.When proppant is placed in the fracture,at a low closure pressure,due to the combined effects of self-support of rough fracture surface,proppant instability and uneven proppant placement,the flow heterogeneity is greater than that when proppant is not placed at the same closure pressure;however,with the increase of the closure pressure,the proppant becomes compact and stable,and the flow heterogeneity is mitigated gradually.展开更多
A New method of rock drillability classification for impregnated diamond drilling is recommended. The essence of the method is comparing the area of the slots cut respectively on a standard synthetic rock sample and t...A New method of rock drillability classification for impregnated diamond drilling is recommended. The essence of the method is comparing the area of the slots cut respectively on a standard synthetic rock sample and the rock sample being classified by one diamond saw to determine the rock drillability in diamond core drilling. This method has the advantages of good in simulation and stable in comparison standard.展开更多
对雷达装备故障文本进行智能化分类,有助于提高雷达装备保障效率。针对雷达故障文本专业性强,样本量小且不平衡的问题,通过非核心词EDA进行类内数据增强,以实现在增加文本量的同时保持关键信息不变。针对非核心词EDA方法产生的新样本多...对雷达装备故障文本进行智能化分类,有助于提高雷达装备保障效率。针对雷达故障文本专业性强,样本量小且不平衡的问题,通过非核心词EDA进行类内数据增强,以实现在增加文本量的同时保持关键信息不变。针对非核心词EDA方法产生的新样本多样性不够的问题,增加SSMix(saliency-based span mixup for text classification),进行类间数据增强,通过对输入文本非线性的交叉融合来提升文本的多样性。实验证明,与现有的经典基线分类方法和典型数据增强分类方法相比,该方法在准确率上有较大幅度的提升。展开更多
学业质量标准是核心素养评价的主要依据,可直接反映体育核心素养的掌握情况。文章运用文献资料法与逻辑分析法,借鉴SOLO分类理论的研究成果得出SOLO(Structure of the Observed Learning Outcome,观察到的学习成果的结构)分类理论下核...学业质量标准是核心素养评价的主要依据,可直接反映体育核心素养的掌握情况。文章运用文献资料法与逻辑分析法,借鉴SOLO分类理论的研究成果得出SOLO(Structure of the Observed Learning Outcome,观察到的学习成果的结构)分类理论下核心素养评价的主要内涵,认为体育与健康核心素养评价的过程包括5个方面:学科认知是核心素养评价的起点,学习预期是核心素养评价的中间环节,证据表现是核心素养评价的基础,证据有效性是核心素养评价的关键。文章提出实现学业质量评价的主要路径需要:优化任务场景,强化体育与健康学业质量和核心素养的认知;多维视角证据收集,科学评估核心素养;规范体育与健康核心素养的评价程序,实现评价的综合性;建立协同参与机制,确保体育与健康核心素养评价的常态化;强调评价方式的多样性,推进体育与健康核心素养评价的持续性。展开更多
An idea to develop a family of cellular cores for sandwich panels using a technology of prepreg folding is presented.Polar folded quadra-structures are regarded as a geometric basis for these cores whose standard frag...An idea to develop a family of cellular cores for sandwich panels using a technology of prepreg folding is presented.Polar folded quadra-structures are regarded as a geometric basis for these cores whose standard fragment has the fourth degree of axial symmetry.The classification of the polar structures are described and a method of various quadra-structure synthesis is developed.A possibility to provide high strength of the structure due to preservation of faces reinforcement pattern is presented.Arrangement of the plane core on a bi-curvature surface is also introduced.Besides,provision of isotropy of the core in two or three directions are described.Finally,examples of cellular folded cores manufactured from basalt reinforced plastic are demonstrated.展开更多
Background: Since introducing stereotactic core biopsy (SCB) on breast lesions in Denmark, no national follow-up of the procedure has been executed. Purpose: To evaluate performance of SCB in Danish mammography screen...Background: Since introducing stereotactic core biopsy (SCB) on breast lesions in Denmark, no national follow-up of the procedure has been executed. Purpose: To evaluate performance of SCB in Danish mammography screening. 3 areas were selected for evaluation: diagnostic value of SCB, performance of the Danish 7-tier mamma-radiological classifications system, DKBI-RADS, and diagnostic delay for SCB-diagnosis. Materials & Methods: Danish retrospective national cohort study including 2195 screening patients undergoing SCB. Study period: 01.01.2010 to 30.09.2012. Patients were identified from The Danish National Patient Register. Pathology-data were obtained from the Danish Pathology Database. Radiological-data according to DKBI-RADS were recorded. Diagnostic delay from clinical mammography until diagnosis was registered. Results: 173 SCBs indicated cancer;all operated with 3 cases finalized as benign. 1296 cases were determined benign with diagnostic surgery in 81 cases of which 31 were concluded pre-malignant/malignant. Correlation between DKBI-RADS and pathology diagnosis: 329 of 485 DKBI-RADS3, 227 of 450 DKBI-RADS4 were benign. 4 of 16 DKBI-RADS5 were benign. The diagnostic value of pre-malignant/malignant SCB related to results from surgery showed 94.4% sensitivity and a positive predictive value of 93.9%. Median diagnostic-time of single-biopsy was 13 days. Conclusion: The performance of SCB in Denmark is comparable to international studies regarding the diagnostic value of malignant SCB. The study indicates that DKBI-RADS classifications are not used consistently regarding micro-calcifications selected in screening-mammographies. Diagnostic delay is acceptable, subject to EUSOMA specifications, regarding single-biopsy.展开更多
目的:筛选出脊髓损伤患者神经源性膀胱的国际功能、残疾、健康分类核心类目。方法:通过ISCOS提供的开放脊髓损伤数据库(international SCI data sets)筛选出和神经源性膀胱相关的基础数据库,整理出这些数据库的每个变量。利用WHO-FIC合...目的:筛选出脊髓损伤患者神经源性膀胱的国际功能、残疾、健康分类核心类目。方法:通过ISCOS提供的开放脊髓损伤数据库(international SCI data sets)筛选出和神经源性膀胱相关的基础数据库,整理出这些数据库的每个变量。利用WHO-FIC合作中心ICF研究组开发的ICF与结局测量工具间联系和匹配的原则,采用专业人员对内容定性联系和匹配的方法,将针对筛选出的变量与ICF综合版测量项目进行联系和匹配。整理匹配的ICF项目生成神经源性膀胱ICF核心要素。结果:通过对比2名研究者筛选相同变量,合并相近的变量,剔除与神经源性膀胱不相关的变量,最终纳入85项。共提取有明确意义的概念60个,可与ICF联系、匹配的概念46个。与ICF联系、匹配后共得出神经源性膀胱ICF核心类目40项,其中身体功能16项、身体结构8项、活动和参与9项、环境因素与个人因素7项。结论:系统回顾研究法初步筛选出脊髓损伤患者神经源性膀胱ICF核心类目,为神经源性膀胱评估、治疗提供了更全面的框架。展开更多
基金Supported by National Natural Science Foundation of China Regional Innovation and Development Joint Fund(U19A2043)Project of PetroChina Chuanqing Drilling Engineering Co.,Ltd.(CQ2021B-39-Z2-4).
文摘A self-designed full-diameter core experimental facility was used to evaluate the flow heterogeneity of bedding fractures at four radial directions under different closure pressures and injection rates,using full-diameter cores retaining original natural bedding fractures.The distribution morphology of bedding surface affects the conductivity of bedding fractures,and the flow capacity of bedding fractures in four radial directions varies greatly with the closure pressure and injection rate.The rougher the fracture surface,the greater the flow capacity varies with the closure pressure.For unsupported bedding fractures,the mean percentage error(MPE)of the conductivity in four radial directions increase gradually with the increase of the closure pressure.This phenomenon is especially prominent in deep rock samples.It is indicated that the flow heterogeneity of bedding fractures tends to increase with the closure pressure.When proppant is placed in the fracture,at a low closure pressure,due to the combined effects of self-support of rough fracture surface,proppant instability and uneven proppant placement,the flow heterogeneity is greater than that when proppant is not placed at the same closure pressure;however,with the increase of the closure pressure,the proppant becomes compact and stable,and the flow heterogeneity is mitigated gradually.
文摘A New method of rock drillability classification for impregnated diamond drilling is recommended. The essence of the method is comparing the area of the slots cut respectively on a standard synthetic rock sample and the rock sample being classified by one diamond saw to determine the rock drillability in diamond core drilling. This method has the advantages of good in simulation and stable in comparison standard.
文摘对雷达装备故障文本进行智能化分类,有助于提高雷达装备保障效率。针对雷达故障文本专业性强,样本量小且不平衡的问题,通过非核心词EDA进行类内数据增强,以实现在增加文本量的同时保持关键信息不变。针对非核心词EDA方法产生的新样本多样性不够的问题,增加SSMix(saliency-based span mixup for text classification),进行类间数据增强,通过对输入文本非线性的交叉融合来提升文本的多样性。实验证明,与现有的经典基线分类方法和典型数据增强分类方法相比,该方法在准确率上有较大幅度的提升。
文摘学业质量标准是核心素养评价的主要依据,可直接反映体育核心素养的掌握情况。文章运用文献资料法与逻辑分析法,借鉴SOLO分类理论的研究成果得出SOLO(Structure of the Observed Learning Outcome,观察到的学习成果的结构)分类理论下核心素养评价的主要内涵,认为体育与健康核心素养评价的过程包括5个方面:学科认知是核心素养评价的起点,学习预期是核心素养评价的中间环节,证据表现是核心素养评价的基础,证据有效性是核心素养评价的关键。文章提出实现学业质量评价的主要路径需要:优化任务场景,强化体育与健康学业质量和核心素养的认知;多维视角证据收集,科学评估核心素养;规范体育与健康核心素养的评价程序,实现评价的综合性;建立协同参与机制,确保体育与健康核心素养评价的常态化;强调评价方式的多样性,推进体育与健康核心素养评价的持续性。
基金supported by the Ministry of Education and Science of Russian Federation (No.RFMEFI57414X0078)
文摘An idea to develop a family of cellular cores for sandwich panels using a technology of prepreg folding is presented.Polar folded quadra-structures are regarded as a geometric basis for these cores whose standard fragment has the fourth degree of axial symmetry.The classification of the polar structures are described and a method of various quadra-structure synthesis is developed.A possibility to provide high strength of the structure due to preservation of faces reinforcement pattern is presented.Arrangement of the plane core on a bi-curvature surface is also introduced.Besides,provision of isotropy of the core in two or three directions are described.Finally,examples of cellular folded cores manufactured from basalt reinforced plastic are demonstrated.
基金Region of Southern DenmarkDepartment of Breast Surgery, Lillebaelt Hospital, Vejle Research Council Lillebaelt Hospital
文摘Background: Since introducing stereotactic core biopsy (SCB) on breast lesions in Denmark, no national follow-up of the procedure has been executed. Purpose: To evaluate performance of SCB in Danish mammography screening. 3 areas were selected for evaluation: diagnostic value of SCB, performance of the Danish 7-tier mamma-radiological classifications system, DKBI-RADS, and diagnostic delay for SCB-diagnosis. Materials & Methods: Danish retrospective national cohort study including 2195 screening patients undergoing SCB. Study period: 01.01.2010 to 30.09.2012. Patients were identified from The Danish National Patient Register. Pathology-data were obtained from the Danish Pathology Database. Radiological-data according to DKBI-RADS were recorded. Diagnostic delay from clinical mammography until diagnosis was registered. Results: 173 SCBs indicated cancer;all operated with 3 cases finalized as benign. 1296 cases were determined benign with diagnostic surgery in 81 cases of which 31 were concluded pre-malignant/malignant. Correlation between DKBI-RADS and pathology diagnosis: 329 of 485 DKBI-RADS3, 227 of 450 DKBI-RADS4 were benign. 4 of 16 DKBI-RADS5 were benign. The diagnostic value of pre-malignant/malignant SCB related to results from surgery showed 94.4% sensitivity and a positive predictive value of 93.9%. Median diagnostic-time of single-biopsy was 13 days. Conclusion: The performance of SCB in Denmark is comparable to international studies regarding the diagnostic value of malignant SCB. The study indicates that DKBI-RADS classifications are not used consistently regarding micro-calcifications selected in screening-mammographies. Diagnostic delay is acceptable, subject to EUSOMA specifications, regarding single-biopsy.
文摘目的:筛选出脊髓损伤患者神经源性膀胱的国际功能、残疾、健康分类核心类目。方法:通过ISCOS提供的开放脊髓损伤数据库(international SCI data sets)筛选出和神经源性膀胱相关的基础数据库,整理出这些数据库的每个变量。利用WHO-FIC合作中心ICF研究组开发的ICF与结局测量工具间联系和匹配的原则,采用专业人员对内容定性联系和匹配的方法,将针对筛选出的变量与ICF综合版测量项目进行联系和匹配。整理匹配的ICF项目生成神经源性膀胱ICF核心要素。结果:通过对比2名研究者筛选相同变量,合并相近的变量,剔除与神经源性膀胱不相关的变量,最终纳入85项。共提取有明确意义的概念60个,可与ICF联系、匹配的概念46个。与ICF联系、匹配后共得出神经源性膀胱ICF核心类目40项,其中身体功能16项、身体结构8项、活动和参与9项、环境因素与个人因素7项。结论:系统回顾研究法初步筛选出脊髓损伤患者神经源性膀胱ICF核心类目,为神经源性膀胱评估、治疗提供了更全面的框架。
