检索结果-南通市图书馆

Denoising enabled channel estimation for underwater acoustic communications:A sparsity-aware model-driven learning approach

在线全文

学校读者我要写书评

暂无评论

Intelligent and Converged Networks 2023年第1期4卷 1-14页

作者： Sicong Liu Younan Mou xianyao wang Danping Su Ling Cheng School of Informatics Xiamen UniversityXiamen 361005China National Mobile Communications Research Laboratory Southeast UniversityNanjing 210096China the Information Engineering University of the WitwatersrandJohannesburg 2050South Africa

It has always been difficult to achieve accurate information of the channel for underwater acoustic communications because of the severe underwater propagation conditions,including frequency-selective property,high relative mobility,long propagation latency,and intensive ambient noise,etc.To this end,a deep unfolding neural network based approach is proposed,in which multiple layers of the network mimic the iterations of the classical iterative sparse approximation algorithm to extract the inherent sparse features of the channel by exploiting deep learning,and a scheme based on the Sparsity-Aware DNN(SA-DNN)for UAC estimation is proposed to improve the estimation accuracy.Moreover,we propose a Denoising Sparsity-Aware DNN(DeSA-DNN)based enhanced method that integrates a denoising CNN module in the sparsity-aware deep network,so that the degradation brought by intensive ambient noise could be eliminated and the estimation accuracy can be further improved.Simulation results demonstrate that the performance of the proposed schemes is superior to the state-of-the-art compressed sensing based and iterative sparse recovery schems in the aspects of channel recovery precision,pilot overhead,and robustness,particularly under unideal circumstances of intensive ambient noise or inadequate measurement pilots.

关键词： Orthogonal Frequency Division Multiplexing(OFDM) Underwater Acoustic Communications(UAC) sparse recovery deep learning sparse learning denoising approximate message passing

高流量脉冲作用下河流交汇区鱼类水力生境指标时空变化

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

人民黄河 2024年第6期46卷 103-108,112页

作者：汪贤瑶钟亮姜利重庆交通大学国家内河航道整治工程技术研究中心重庆400074 重庆交通大学水利水运工程教育部重点实验室重庆400074

干支流交汇区是鱼类生存栖息和洄游迁徙的重要场所,交汇区水文条件复杂,水流结构时空演替变化,将对鱼类水力生境指标变化产生直接影响。研究高流量脉冲条件下河道交汇区鱼类水力生境指标的变化特征,对河流生态系统保护具有重要意义。以... 详细信息

干支流交汇区是鱼类生存栖息和洄游迁徙的重要场所,交汇区水文条件复杂,水流结构时空演替变化,将对鱼类水力生境指标变化产生直接影响。研究高流量脉冲条件下河道交汇区鱼类水力生境指标的变化特征,对河流生态系统保护具有重要意义。以长江与嘉陵江交汇区为例,采用三维水流数值模拟方法,分析鱼类水力生境指标时空分布与高流量脉冲过程的响应关系。结果表明:涨水过程干支流顶托作用增强,交汇区弯曲河道凹岸及河底深槽处出现最大流速,凸岸分离区回流区宽度减小;栖息地适宜度指数SH大于0.8的区域在深槽和边滩间移动,随涨水过程向河底及凸岸边壁偏移,随落水被压缩至凹岸深槽及边滩;高流量脉冲条件下,交汇区微生境适宜性面积A随涨落水呈先增大后减小的变化趋势,A峰值出现在高流量脉冲峰值附近。

关键词：高流量脉冲交汇区鱼类水力生境指标时空分布特征

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

新生儿先天性板层状鱼鳞病1例

中华新生儿科杂志（中英文） 2024年第2期39卷 118-119页

作者：林建丰王宪耀海丰县彭湃纪念医院新生儿科汕尾515400 汕头市中心医院儿科汕头515041

本文报道1例先天性板层状鱼鳞病新生儿,生后即发现全身皮肤呈羊皮纸样,STS基因检测发现患儿TGM1基因存在c.1267C>A、c.790C>T复合杂合变异,均为错义变异,其中c.1267C>A为未报道过的变异,家属放弃治疗后患儿很快死亡。

关键词：板层状鱼鳞病 TGM1基因复合杂合变异

Arctic Sea Level Variability from Oceanic Reanalysis and Observations

在线全文

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2023年第12期40卷 2362-2377页

作者： Jinping wang xianyao CHEN Frontier Science Center for Deep Ocean Multispheres and Earth System Key Laboratory of Physical OceanographyOcean University of ChinaQingdao 266100China Laoshan Laboratory Qingdao 266237China

Quantifying the contributions to Arctic sea level(ASL)variability is critical to understand how the Arctic is responsing to ongoing climate change.Here,we use Ocean Reanalysis System 5(ORAS5)reanalysis data and tide gauge and satellite altimetry observations to quantify contributions from different physical processes on the ASL variability.The ORAS5 reanalysis shows that the ASL is rising with a trend of 2.5±0.3 mm yr−1(95%confidence level)over 1979-2018,which can be attributed to four components:(i)the dominant component from the global sea level increase of 1.9±0.5 mm yr−1,explaining 69.7%of the total variance of the ASL time series;(ii)the Arctic Oscillation-induced mass redistribution between the deep central basin and shallow shelves,with no significant trend and explaining 6.3%of the total variance;(iii)the steric sea level increase centering on the Beaufort Gyre region with a trend of 0.5±0.1 mm yr−1 and explaining 29.1%of the total variance of the ASL time series;and(iv)the intrusion of Pacific water into the Arctic Ocean,with no significant trend and contributing 14.2%of the total ASL variability.Furthermore,the dramatic sea ice melting and the larger area of open water changes the impact of the large-scale atmospheric forcing on the ASL variability after 1995,and the ocean dynamic circulation plays a more important role in the ASL variability.

关键词： sea level variability Arctic Ocean sea level rise steric sea level global warming

丹参酮ⅡA磺酸钠减轻过氧化氢诱导的人脐静脉内皮细胞焦亡

在线全文

学校读者我要写书评

暂无评论

中华整形外科杂志 2024年第3期40卷 307-317页

作者：潘筱云陶先耀糜菁熠毛栋汪凯芮永军苏州大学附属无锡九院骨科研究所无锡214063 苏州大学附属无锡九院手外科无锡214063 苏州大学附属无锡九院运动医学科无锡214063 苏州大学附属无锡九院创伤骨科无锡214063

目的探讨丹参酮ⅡA磺酸钠(STS)对过氧化氢(H_(2)O_(2))诱导后人脐静脉内皮细胞(HUVECs)焦亡的影响及其可能机制。方法2021年11月至2022年9月,采用无锡市第九人民医院保存的HUVECs细胞株作为研究对象,实验分为4组:空白对照组(正常条件)... 详细信息

目的探讨丹参酮ⅡA磺酸钠(STS)对过氧化氢(H_(2)O_(2))诱导后人脐静脉内皮细胞(HUVECs)焦亡的影响及其可能机制。方法2021年11月至2022年9月,采用无锡市第九人民医院保存的HUVECs细胞株作为研究对象,实验分为4组:空白对照组(正常条件)、空白+STS组、H_(2)O_(2)组、H_(2)O_(2)+STS组。待细胞长至80%融合度时,H_(2)O_(2)组和H_(2)O_(2)+STS组加入500.00μmol/L H_(2)O_(2)诱导3 h,去除含500.00μmol/L H_(2)O_(2)的培养基之后,空白+STS组和H_(2)O_(2)+STS组加入5.00μg/ml STS与HUVECs共培养24 h。通过CCK-8实验检测不同浓度(0、0.05、0.50、5.00、50.00、500.00μg/ml)的STS对HUVECs增殖的影响,TUNEL染色检测DNA损伤阳性细胞,实时荧光定量PCR(RT-PCR)检测炎症小体核苷酸结合寡聚化结构域样受体蛋白3(NLRP3)的表达来确定H_(2)O_(2)诱导焦亡的最适浓度。检测试剂盒检测H_(2)O_(2)诱导后活性氧自由基(ROS)表达。细胞划痕实验和基质胶体外成管实验探究STS对焦亡状态下HUVECs迁移能力和成管能力的影响。RT-PCR和Western blotting检测NLRP3、Caspase-1、白细胞介素-18、白细胞介素-1β的基因和蛋白表达。不同时点浓度比较采用重复测量方差分析,2组间数据比较采用t检验,多组间数据比较采用单因素方差分析,P0.05)。ROS检测结果显示,与H_(2)O_(2)组比,H_(2)O_(2)+STS组细胞内ROS明显降低,差异有统计学意义(P0.05)。RT-PCR和Western blotting结果显示,H_(2)O_(2)+STS组与H_(2)O_(2)组比较,细胞焦亡相关因子表达降低,差异有统计学意义(P<0.05)。结论STS可通过抑制ROS的过量产生,促进细胞焦亡诱导后HUVECs的细胞迁移和管样形成,减轻H_(2)O_(2)诱导的HUVECs细胞焦亡,从而促进血管生成。

关键词：人脐静脉内皮细胞细胞焦亡丹参酮ⅡA磺酸钠血管生成

拇长伸肌腱瓣V-Y延长术修复开放性锤状指畸形

在线全文

学校读者我要写书评

暂无评论

中华手外科杂志 2024年第2期40卷 128-131页

作者：陆浩锁星星王进陶先耀薛明宇周晓苏州大学附属无锡市第九人民医院无锡市手外科医院无锡214062 东南大学附属中大医院无锡分院呼吸与危重症医学科无锡214105

目的探讨拇长伸肌腱瓣V-Y延长术治疗开放性拇指锤状指畸形的临床疗效。方法自2019年4月至2022年4月,我们收治伴拇指背侧小面积复合组织缺损的锤状指患者9例,缺损位于拇指指间关节背侧,皮肤缺损面积为0.5 cm×0.5 cm~1.5 cm×1.5 cm,肌... 详细信息

目的探讨拇长伸肌腱瓣V-Y延长术治疗开放性拇指锤状指畸形的临床疗效。方法自2019年4月至2022年4月,我们收治伴拇指背侧小面积复合组织缺损的锤状指患者9例,缺损位于拇指指间关节背侧,皮肤缺损面积为0.5 cm×0.5 cm~1.5 cm×1.5 cm,肌腱缺损长度0.5~1.0 cm,采用拇长肌腱瓣V-Y延长覆盖创面,修复伸肌腱,克氏针内固定4周。术后随访观察皮瓣质地、外形、运动及感觉功能恢复情况,测量皮瓣两点分辨觉、感觉恢复度及拇指屈伸活动度。结果术后9例皮瓣全部存活,随访时间为6~14个月,平均10个月。皮瓣修复后手指外形满意,外观良好,质地柔软,无挛缩和凹陷瘢痕。根据中华医学会手外科学会上肢功能评定试用标准评定手功能:优6例,良3例。两点分辨觉为6~9 mm,平均8.0 mm,感觉恢复至S3。结论利用拇长伸肌腱瓣V-Y延长修复拇指背侧复合组织小面积缺损所导致的锤状指畸形,手术简单,供区损伤小,是修复此类损伤的良好方法。

关键词：腱损伤治疗结果打拇长伸肌腱 V-Y推进开开放性锤状指

外泌体来源的环状RNA对肿瘤细胞和免疫细胞的调控作用研究进展

在线全文

学校读者我要写书评

暂无评论

遵义医科大学学报 2024年第5期47卷 522-530页

作者：张隆泽汪显耀何志旭遵义医科大学基础医学院免疫学教研室贵州遵义563006 遵义医科大学组织损伤修复与再生医学省部共建协同创新中心贵州遵义563003 遵义医科大学附属医院细胞工程实验室贵州遵义563003 遵义医科大学附属医院儿科贵州遵义563003

外泌体(Exo)是由细胞分泌的纳米级囊泡,可通过运载多种物质影响细胞间通讯,在肿瘤微环境(TME)中调控肿瘤的发生发展。环状RNA(circRNA)是一类首尾相连的非编码RNA分子,其独特的结构导致它不易在体内降解。近年来,circRNA在肿瘤进展中的... 详细信息

外泌体(Exo)是由细胞分泌的纳米级囊泡,可通过运载多种物质影响细胞间通讯,在肿瘤微环境(TME)中调控肿瘤的发生发展。环状RNA(circRNA)是一类首尾相连的非编码RNA分子,其独特的结构导致它不易在体内降解。近年来,circRNA在肿瘤进展中的功能逐渐被揭露,且在Exo中检测到大量异常表达的circRNA。较多研究表明,Exo来源的circRNA(Exo-circRNA)在TME中直接或间接参与了肿瘤细胞的增殖、转移、代谢和耐药的调控。同时,TME中的Exo-circRNA也能调控免疫细胞的活化和功能,影响肿瘤免疫治疗。然而,此前的研究主要集中于总结Exo-circRNA对肿瘤细胞调控作用的进展,探讨Exo-circRNA调控免疫细胞的研究较为少见且其中多数都侧重于总结Exo-circRNA调控CD8+T细胞功能的研究进展。本文的创新之处在于不仅对Exo-circRNA在调控肿瘤细胞方面的研究进行了综述,还深入探讨了其对TME中包括CD8+T细胞在内的多种免疫细胞的调控作用及其具体机制。此外,我们也对Exo-circRNA在肿瘤治疗以及免疫治疗方面的潜在临床应用前景进行了展望,为Exo-circRNA作为肿瘤诊断标志物和治疗靶点提供了理论依据。

关键词：外泌体环状RNA 肿瘤细胞免疫细胞肿瘤微环境

Characteristics and evolution of faults in the north-central Yin’e Basin and the effects on the coal-seam in the Cretaceous strata

在线全文

学校读者我要写书评

暂无评论

Frontiers of Earth Science 2023年第1期17卷 30-44页

作者： Qiang YU Baojiang wang Zhanli REN xianyao SUN Xianghe LEI Ahmed KHALED Qike YANG School of Earth Science and Resources Chang᾽an UniversityXi᾽an 710054China School of Information Technology Xichang UniversityXichang 615013China Department of geology Northwest UniversityXi’an 710069China

Research on the characteristics of faults and their evolutionary history since the Cretaceous in the Suhongtu-Dagu depressions can provide a theoretical basis for geological evaluation of the coal seams in the Suhongtu Formation in the northern-central region of the Yin’e Basin.Using 3-D seismic-logging inversion techniques,seismic stratigraphic calibration,stratigraphic sequence delineation,and thickness calculations on the Suhongtu-Dagu depressions were carried out to clarify the planar and profile distributions of the faults,as well as the evolutionary history of these faults and the tectonic history of the depressions.The results of this study revealed that the distribution of the faults in the Suhongtu-Dagu depressions in the northern part of the Yin’e Basin varies with region,and the fault system was multi-period,orthotropic,north-east-trending,and north-north-east-trending,with a certain degree of inheritance in terms of the geological setting.Three types of faults were identified:Y-shaped fractures,reverse Y-shaped fractures,and parallel fractures,which can be classified as Paleozoic-Cenozoic continuous syncline faults and intra-depression faults from the top of the Permian to the Upper Cretaceous series and inter-stratigraphic adjustment faults within the Cretaceous System,respectively.The evolution of these faults can be divided into three phases:the controlling faults were the faults that existed before the Early Cretaceous and had been active since then;synclinal faults that formed during the Early Cretaceous;and modified faults that formed since the Early Cretaceous.The development and modification of the coal seams in the Cretaceous Suhongtu Formation in the Hari,Kuanzihu,and Babei sags were strongly controlled and influenced by a multi-phase complex fault system.

关键词： coal-seam tectonic evolution seismotectonic interpretation Hari depression 3D distribution of faults oil-gas exploration Guaizihu depression

Fire Detection Algorithm Based on an Improved Strategy of YOLOv5 and Flame Threshold Segmentation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2023年第6期75卷 5639-5657页

作者： Zhao Yuchen Wu Shulei wang Yaoru Chen Huandong Zhang xianyao Zhao Hongwei School of Information Science and Technology Hainan Normal UniversityHaikou571158China

Due to the rapid growth and spread of fire,it poses a major threat to human life and property.Timely use of fire detection technology can reduce disaster losses.The traditional threshold segmentation method is unstable,and the flame recognition methods of deep learning require a large amount of labeled data for training.In order to solve these problems,this paper proposes a new method combining You Only Look Once version 5(YOLOv5)network model and improved flame segmentation algorithm.On the basis of the traditional color space threshold segmentation method,the original segmentation threshold is replaced by the proportion threshold,and the characteristic information of the flame is maximally retained.In the YOLOv5 network model,the training module is set by combining the ideas of Bootstrapping and cross validation,and the data distribution of YOLOv5 network training is adjusted.At the same time,the feature information after segmentation is added to the data set.Different from the training method that uses large-scale data sets for model training,the proposed method trains the model on the basis of a small data set,and achieves better model detection results,and the detection accuracy of the model in the validation set reaches 0.96.Experimental results show that the proposed method can detect flame features with faster speed and higher accuracy compared with the original method.

关键词： YOLOv5 fire safety deep learning flame detection