目的:探讨第二产程初期运用支撑式前倾跪位对全程实施分娩镇痛的初产妇分娩结局的影响。方法:按纳入排除方法将实施分娩镇痛的初产妇按完全随机方法分成观察组和对照组各95例。两组孕妇第一产程均采取自由体位。观察组第二产程初期采用...目的:探讨第二产程初期运用支撑式前倾跪位对全程实施分娩镇痛的初产妇分娩结局的影响。方法:按纳入排除方法将实施分娩镇痛的初产妇按完全随机方法分成观察组和对照组各95例。两组孕妇第一产程均采取自由体位。观察组第二产程初期采用支撑式前倾跪位,至胎先露为(S+4)时,改为膀胱截石位;对照组第二产程全程为膀胱截石位。两组产妇均使用常规手法接生,分析比较两组孕产妇间产程和分娩结局的差异。结果:观察组第二产程时间较对照组短(67.54±37.28 min vs.79.17±35.76 min,P<0.05),新生儿1 min Apgar评分高于对照组(9.97±0.67 vs.9.77±0.23,P<0.05)。二分类Logistic回归分析显示观察组阴道分娩率明显高于对照组(OR=8.644,95%CI=1.059-70.530),第二产程中胎心减速的发生率明显低于对照组(OR=0.253,95%CI=0.079-0.809)。结论:对于全程实施分娩镇痛的初产妇,在第二产程初期运用支撑式前倾跪位可以缩短第二产程,降低中转剖宫产率,提高阴道分娩成功率,改善新生儿评分。展开更多
针对SAR图像船舶检测任务在船舶组合和船舶融合场景下低检测精度的问题,提出了一种轻量化船舶检测算法——RGDET-Ship,有效提高了SAR图像在复杂场景下的船舶检测精度。该算法的创新点包括:①构建基于改进ResNet的基础主干网络,增强深浅...针对SAR图像船舶检测任务在船舶组合和船舶融合场景下低检测精度的问题,提出了一种轻量化船舶检测算法——RGDET-Ship,有效提高了SAR图像在复杂场景下的船舶检测精度。该算法的创新点包括:①构建基于改进ResNet的基础主干网络,增强深浅网络早特征融合,保留更丰富的有效特征图,并利用RegNet进行模型搜索得到一簇最优结构子网络RegNet and Early-Add(RGEA),实现模型的轻量化;②在FPN Neck基础上,结合EA-fusion策略设计出FPN and Early Add Fusion(FEAF)Neck网络,进一步加强深浅特征晚融合,提高中大船舶目标特征的提取;③通过细粒度分析改进RPN网络得到Two-RPN(TRPN)网络,提高模型的检测粒度和预测框准确性;④引入多任务损失函数——Cross Entropy Loss and Smooth L1 Loss(CE_S),包括分类任务和回归任务,进一步提升检测性能。通过在标准基准数据集SSDD上进行大量实验,验证了RGDET-Ship模型的有效性和健壮性。实验结果表明,相较于Faster RCNN和Cascade RCNN,RGDET-Ship在mAP_0.5:0.95上分别提升了5.6%和3.3%,在AR上分别提升了9.8%和7.6%。展开更多
Torquigener albomaculosus,also known as the white-spotted pufferfish,is known for creating circular nests in the underwater sand as part of the mating ritual.The nests are built by the males to attract females through...Torquigener albomaculosus,also known as the white-spotted pufferfish,is known for creating circular nests in the underwater sand as part of the mating ritual.The nests are built by the males to attract females through the nest’s impressive design and related ability to gather fine sand particles.As the fluid-dynamic processes associated with these unique nests are still almost completely unknown,in the present study,an analysis has been conducted to investigate how the geometric parameters related to the nest design influence the fluid velocity in its center.For this reason,a geometric model of the nest consisting of 24 channels,where each unit channel can be described by three strips of broken lines,has been introduced,and a multivariate analysis has been implemented to determine the relative weight of each considered parameter.In particular,the“optimal”combination of parameters has been obtained by means of an orthogonal design approach.We show that these bio-nest structures also display a potential for significant application in marine litter collection,or for use as a buffer against the waves in offshore areas.展开更多
Paraganglioma is a rare neuroendocrine neoplasm observed in patients of all ages, with an estimated incidence of 3/1,000,000 population. It has long been recognized that some cases are familial. The majority of these ...Paraganglioma is a rare neuroendocrine neoplasm observed in patients of all ages, with an estimated incidence of 3/1,000,000 population. It has long been recognized that some cases are familial. The majority of these tumors are benign, and the only absolute criterion for malignancy is the presence of metastases at sites where chromaffin tissue is not usually found. Some tumors show gross local invasion and recurrence, which may indeed kill the patient, but this does not necessarily associate with metastatic potential. Here, we report a case of vertebral metastatic paraganglioma that occurred 19 months after the patient had undergone partial cystectomy for urinary bladder paraganglioma. We believe this to be a rarely reported bone metastasis of paraganglioma arising originally within the urinary bladder. In this report, we also provide a summary of the general characteristics of this disease, together with progress in diagnosis, treatment, and prognosis.展开更多
文摘目的:探讨第二产程初期运用支撑式前倾跪位对全程实施分娩镇痛的初产妇分娩结局的影响。方法:按纳入排除方法将实施分娩镇痛的初产妇按完全随机方法分成观察组和对照组各95例。两组孕妇第一产程均采取自由体位。观察组第二产程初期采用支撑式前倾跪位,至胎先露为(S+4)时,改为膀胱截石位;对照组第二产程全程为膀胱截石位。两组产妇均使用常规手法接生,分析比较两组孕产妇间产程和分娩结局的差异。结果:观察组第二产程时间较对照组短(67.54±37.28 min vs.79.17±35.76 min,P<0.05),新生儿1 min Apgar评分高于对照组(9.97±0.67 vs.9.77±0.23,P<0.05)。二分类Logistic回归分析显示观察组阴道分娩率明显高于对照组(OR=8.644,95%CI=1.059-70.530),第二产程中胎心减速的发生率明显低于对照组(OR=0.253,95%CI=0.079-0.809)。结论:对于全程实施分娩镇痛的初产妇,在第二产程初期运用支撑式前倾跪位可以缩短第二产程,降低中转剖宫产率,提高阴道分娩成功率,改善新生儿评分。
文摘针对遥感影像复杂背景和小目标检测困难的问题,提出了一种基于多感知融合的检测算法YOLO-GT。为了提升特征图中小目标的特征信息,设计了包含3种感知机制的检测头Adaptive Scale-Aware Dynamic Head(ASADH);引入轻量级上采样算子Content-Aware ReAssembly of Features (CARAFE),解决语义信息丢失问题,提升特征金字塔网络性能;为进一步优化模型的训练速度和定位精度,采用了Wise-IoU作为损失函数。实验结果在DIOR数据集上显示,模型精度达90.4%,比原算法提高2.1%。这些改进有效提高了复杂背景下遥感影像小目标的检测性能。
文摘针对SAR图像船舶检测任务在船舶组合和船舶融合场景下低检测精度的问题,提出了一种轻量化船舶检测算法——RGDET-Ship,有效提高了SAR图像在复杂场景下的船舶检测精度。该算法的创新点包括:①构建基于改进ResNet的基础主干网络,增强深浅网络早特征融合,保留更丰富的有效特征图,并利用RegNet进行模型搜索得到一簇最优结构子网络RegNet and Early-Add(RGEA),实现模型的轻量化;②在FPN Neck基础上,结合EA-fusion策略设计出FPN and Early Add Fusion(FEAF)Neck网络,进一步加强深浅特征晚融合,提高中大船舶目标特征的提取;③通过细粒度分析改进RPN网络得到Two-RPN(TRPN)网络,提高模型的检测粒度和预测框准确性;④引入多任务损失函数——Cross Entropy Loss and Smooth L1 Loss(CE_S),包括分类任务和回归任务,进一步提升检测性能。通过在标准基准数据集SSDD上进行大量实验,验证了RGDET-Ship模型的有效性和健壮性。实验结果表明,相较于Faster RCNN和Cascade RCNN,RGDET-Ship在mAP_0.5:0.95上分别提升了5.6%和3.3%,在AR上分别提升了9.8%和7.6%。
基金This work is supported by the Henan Provincial Science and Technology Research Project(222102220068).
文摘Torquigener albomaculosus,also known as the white-spotted pufferfish,is known for creating circular nests in the underwater sand as part of the mating ritual.The nests are built by the males to attract females through the nest’s impressive design and related ability to gather fine sand particles.As the fluid-dynamic processes associated with these unique nests are still almost completely unknown,in the present study,an analysis has been conducted to investigate how the geometric parameters related to the nest design influence the fluid velocity in its center.For this reason,a geometric model of the nest consisting of 24 channels,where each unit channel can be described by three strips of broken lines,has been introduced,and a multivariate analysis has been implemented to determine the relative weight of each considered parameter.In particular,the“optimal”combination of parameters has been obtained by means of an orthogonal design approach.We show that these bio-nest structures also display a potential for significant application in marine litter collection,or for use as a buffer against the waves in offshore areas.
文摘Paraganglioma is a rare neuroendocrine neoplasm observed in patients of all ages, with an estimated incidence of 3/1,000,000 population. It has long been recognized that some cases are familial. The majority of these tumors are benign, and the only absolute criterion for malignancy is the presence of metastases at sites where chromaffin tissue is not usually found. Some tumors show gross local invasion and recurrence, which may indeed kill the patient, but this does not necessarily associate with metastatic potential. Here, we report a case of vertebral metastatic paraganglioma that occurred 19 months after the patient had undergone partial cystectomy for urinary bladder paraganglioma. We believe this to be a rarely reported bone metastasis of paraganglioma arising originally within the urinary bladder. In this report, we also provide a summary of the general characteristics of this disease, together with progress in diagnosis, treatment, and prognosis.
