检索结果-南通市图书馆

同方期刊数据库

外展嵌插伴后倾型股骨颈骨折术中解剖复位或可接受复位的术后疗效分析

在线全文

学校读者我要写书评

暂无评论

中华创伤骨科杂志 2024年第4期26卷 330-336页

作者：隋佳星桑庆华李海洋石雷吕扬周方北京大学第三医院延庆医院骨科北京102100 北京大学第三医院骨科北京100191

目的探讨外展嵌插伴后倾型的股骨颈骨折术中予以解剖复位或可接受复位的术后疗效。方法回顾性分析2015年1月至2022年1月北京大学第三医院延庆医院骨科行闭合复位空心钉固定手术的外展嵌插伴后倾型股骨颈骨折64例患者资料。男30例,女34例... 详细信息

目的探讨外展嵌插伴后倾型的股骨颈骨折术中予以解剖复位或可接受复位的术后疗效。方法回顾性分析2015年1月至2022年1月北京大学第三医院延庆医院骨科行闭合复位空心钉固定手术的外展嵌插伴后倾型股骨颈骨折64例患者资料。男30例,女34例;年龄62.5(35.0,82.0)岁;根据复位情况将患者分为观察组(30例,解剖复位)和对照组(34例,可接受复位)。通过比较两组患者的手术时间、术中出血量、股骨颈短缩发生率、骨折愈合情况、缺血性坏死发生率、并发症发生率、功能Harris评分等比较疗效。结果两组患者术前基线资料比较差异均无统计学意义(P>0.05),具有可比性。所有患者术后随访时间为(23.4±12.8)个月。两组患者手术时间、术中出血量、缺血性坏死发生率、并发症发生率、Harris评分比较差异均无统计学意义(P>0.05)。围手术期两组患者均无伤口感染、心脑血管意外、深静脉血栓形成等并发症发生;术后长期随访两组患者骨折均愈合;观察组患者股骨颈短缩发生率6.7%(2/30)显著低于对照组29.4%(10/34),差异有统计学意义(P=0.026)。结论外展嵌插伴后倾型股骨颈骨折无论术中解剖复位或可接受复位,都能达到相对满意的结果。

关键词：股骨颈骨折骨折固定术,内股骨头坏死骨折闭合复位

Novel congestion control approach in wireless multimedia sensor networks

在线全文

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2011年第2期18卷 1-8页

作者： liN qiao-min WANG Ru-chuan GUO Jian SUN li-juan College of Computer Nanjing University of Posts and Telecommunications Nanjing 210003 China State Key-lab for Novel Software Technology Nanjing University Nanjing 210093 China

Data generated in wireless multimedia sensor networks （WMSNs） may have different importance and it has been claimed that the network exert more efforts in servicing applications carrying more important information. Nevertheless, importance of packets cannot generally be accurately represented by a static priority value. This article presents a dynamic priority based congestion control （DPCC） approach that makes two major innovations in WMSNs. First, DPCC employs dynamic priority to represent packet importance. Second, it prioritizes the local traffic of motes near the base station when WMSN is highly congested. Simulation results confirm the superior performance of the proposed approach with respect to energy efficiency, loss probability and latency as well.

关键词： wireless multimedia sensor network congestion control quality of service (QoS) dynamic priority

Adenomyosis-derived extracellular vesicles endow endometrial epithelial cells with an invasive phenotype through epithelial-mesenchymal transition

在线全文

学校读者我要写书评

暂无评论

Genes & Diseases 2020年第4期7卷 636-648页

作者： Dayong Chen Hai qiao Yiting Wang ling Zhou Na Yin liaoqiong fang Zhibiao Wang State Key Laboratory of Ultrasound Engineering in Medicine Co-Founded by Chongqing and the Ministry of Science and Technology College of Biomedical EngineeringChongqing Key Laboratory of Biomedical EngineeringChongqing Medical University40016PR China

Extracellular vesicles from highly metastatic tumor cells have been shown to mediate epithelial-mesenchymal transition(EMT)-related events in recipient *** endometrial epithelial cells,EMT processes are known to be involved in the development of *** aimed to investigate whether adenomyosis-derived extracellular vesicles(AMEVs)are able to induce an EMT process in endometrial epithelial *** this study,AMEVs were isolated from patients with adenomyosis and characterized by transmission electron microscopy,Western blot,and nanoparticle *** endometrial epithelial cells(EECs)were derived from normal endometrium tissues from patients with leiomyoma and co-cultured with AMEVs in *** uptake was examined by fluorescence confocal *** invasion of EECs was confirmed by Transwell ***,Western blot,and qRT-PCR were performed on EECs to illustrate the expression levels of cytokeratin 19,E-cadherin,vimentin,and zinc finger E-boxbinding homeobox 1(ZEB1).The results indicated that the cellular fluorescence intensity gradually increased after 48 h of co-culture,but decreased after 72 *** co-culturing with AMEVs for 72 h,EECs expressed significantly lower levels of cytokeratin 19 and E-cadherin,and significantly higher levels of vimentin and *** these results demonstrated that AMEVs induce an EMT process and enhance the invasion of *** changes may contribute to the pathogenesis and progression of adenomyosis.

关键词： Adenomyosis Epithelialmesenchymal transition Extracellular vesicles Primary endometrial epithelial cells Pathogenesis

电场辅助冰温和超冰温贮藏对生鲜牛肉品质的影响

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

中国食品学报 2024年第5期24卷 321-332页

作者：徐毓谦谢菲菲张德权李欣王素方菲刘珊珊侯成立中国农业科学院农产品加工研究所农业农村部农产品质量安全收贮运管控重点实验室北京100193

为研究电场辅助冰温和超冰温贮藏对生鲜牛肉品质的影响,以牛米龙肉为试验材料,分析电场(设备输出电压3300~4000 V,电流0.04 A)辅助冰温(-1℃)、超冰温(-3℃)和非电场(对照组)条件下贮藏0,7,14,21,28,35 d牛肉pH值、色泽、菌落总数、挥... 详细信息

为研究电场辅助冰温和超冰温贮藏对生鲜牛肉品质的影响,以牛米龙肉为试验材料,分析电场(设备输出电压3300~4000 V,电流0.04 A)辅助冰温(-1℃)、超冰温(-3℃)和非电场(对照组)条件下贮藏0,7,14,21,28,35 d牛肉pH值、色泽、菌落总数、挥发性盐基氮(TVB-N)含量、硫代巴比妥酸(TBARS)含量、蒸煮损失、质构、T2弛豫时间及挥发性气味的变化。结果表明,在贮藏35 d时,-1℃+电场组的pH值为5.84、TBARS值为0.55 mg MDA/kg、蒸煮损失为31.84%,显著低于-1℃组的5.97、0.60 mg MDA/kg和36.19%(P0.05),电场处理组牛肉色泽、弹性、凝聚性、咀嚼性及恢复性与对照组相比均无显著差异(P>0.05)。结论:电场辅助冰温、超冰温贮藏可有效改善牛肉的品质和新鲜度,延缓品质劣变。

关键词：电场冰温超冰温牛肉品质

Study on two-phase cloud dispersion from liquefied CO_(2) release

在线全文

学校读者我要写书评

暂无评论

中国化学工程学报:英文版 2023年第8期60卷 37-45页

作者： Chaojie li Xianxin fang Meiling Sun Jihai Duan Weiwen Wang College of Environment and Safety Engineering Qingdao University of Science and TechnologyQingdao 266042China College of Chemical Engineering Qingdao University of Science and TechnologyQingdao 266042China Himile Chemical Technology(ShanDong)Co.Ltd Qingdao 266000China

The knowledge of two-phase cloud dispersion mechanism from HLG(hazardous liquefied gas) release is the prerequisite for accurate assessment and precise rescue of such accidents. In this paper, an experiment of two-phase cloud dispersion from liquefied CO_(2) hole release is performed. The source terms, such as vapour mass fraction, release velocity and mean droplet diameter, are calculated based on thermodynamic theory. Taking phase transition of CO_(2) droplets to gas into account, CFD(computational fluid dynamics) model for two-phase cloud dispersion is established. The predicted cloud temperatures at the downstream agree well with the experimental data, with the maximum relative error of 5.8% and average relative error of 2.3%. The consequence distances in the downstream direction and in the crosswise direction calculated through two-phase model are larger than those through single-phase model,with the relative differences of 57.8% and 53.6% respectively. CO_(2) concentration calculated by twophase model is smaller in the vicinity of release hole, and larger beyond 0.135 m downstream. A smaller leakage rate results in a lower CO_(2) concentration and a higher cloud temperature.

关键词： Two-phase cloud Carbon dioxide CFD Dispersion Phase change

A virtual sequencer reveals the dephasing patterns in error-correction code DNA sequencing

在线全文

学校读者我要写书评

暂无评论

National Science Review 2021年第5期8卷 91-100页

作者： Wenxiong Zhou li Kang Haifeng Duan Shuo qiao Louis Tao Zitian Chen Yanyi Huang Biomedical Pioneering Innovation Center (BIOPIC) School of Life SciencesBeijing Advanced Innovation Center for Genomics(ICG)and Peking-Tsinghua Center for Life SciencesPeking University Center for Bioinformatics State Key Laboratory of Protein Engineering and Plant Genetic EngineeringPeking University Center for Quantitative Biology Peking University College of Engineering Peking University College of Chemistry and Molecular Engineering Peking University Institute for Cell Analysis Chinese Institute for Brain Research (CIBR)

An error-correction code(ECC) sequencing approach has recently been reported to effectively reduce sequencing errors by interrogating a DNA fragment with three orthogonal degenerate sequencing-by-synthesis(SBS) reactions. However, similar to other non-single-molecule SBS methods, the reaction will gradually lose its synchronization within a molecular colony in ECC sequencing. This phenomenon, called dephasing, causes sequencing error, and in ECC sequencing, induces distinctive dephasing patterns. To understand the characteristic dephasing patterns of the dual-base flowgram in ECC sequencing and to generate a correction algorithm, we built a virtual sequencer in silico. Starting from first principles and based on sequencing chemical reactions, we simulated ECC sequencing results, identified the key factors of dephasing in ECC sequencing chemistry and designed an effective dephasing *** results show that our dephasing algorithm is applicable to sequencing signals with at least 500 cycles, or1000-bp average read length, with acceptably low error rate for further parity checks and ECC *** virtual sequencer with our dephasing algorithm can further be extended to a dichromatic form of ECC sequencing, allowing for a potentially much more accurate sequencing approach.

关键词： DNA sequencing error-correction code dephasing computer simulation sequencing-by-synthesis

内蒙古草原内陆河流域水文循环要素时空演变及驱动因素

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

水土保持研究 2024年第5期31卷 279-287页

作者：王银龙高瑞忠房丽晶张旭李宝群内蒙古农业大学水利与土木建筑工程学院呼和浩特010018 锡林郭勒水文水资源分中心内蒙古自治区锡林浩特026099

[目的]开展内蒙古草原内陆河流域水文循环要素对植被动态和气候变化的响应研究,对于内蒙古草原内陆河流域的生态保护及区域水资源开发利用具有重要的理论意义。[方法]以内蒙古草原内陆河流域为研究区,基于多源遥感、气候气象、水文等数... 详细信息

[目的]开展内蒙古草原内陆河流域水文循环要素对植被动态和气候变化的响应研究,对于内蒙古草原内陆河流域的生态保护及区域水资源开发利用具有重要的理论意义。[方法]以内蒙古草原内陆河流域为研究区,基于多源遥感、气候气象、水文等数据,采用趋势检验、显著性检验和相关性分析等方法,对流域水文循环要素的时空演变及驱动因素进行相关分析。[结果](1)流域蒸散发呈显著上升趋势(0.994 mm/a),降水量呈显著下降趋势(2.69 mm/a),土壤水分呈增加趋势,其中子流域锡林河径流呈下降趋势,巴拉格尔河径流呈上升趋势;(2)生长季植被总体呈增加趋势,植被归一化指数(NDVI)、总初级生产力(GPP)和叶面积指数(LAI)整体呈东高西低的阶梯状空间分布格局,气温整体呈现上升趋势;(3)植被变化与蒸散发(ET)、土壤水分(SSM)呈正相关,气温和蒸散发整体上呈现显著正相关(R=0.699,p=0.01),空间相关性由西向东递增;气温和径流呈负相关,和土壤水分在流域东、西部呈显著负相关性。[结论]流域水文循环变量(降水、蒸散发、土壤水分、径流量)随着植被增加而增加;降水、土壤水分和径流量随气温上升而减少,蒸散发随气温上升而增加。

关键词：草原内陆河流域气候变化植被动态水文响应趋势分析

维普期刊数据库博看期刊

Artificial neural network algorithm for pulse shape discrimination in 2πα and 2πβ particle surface emission rate measurements

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2023年第10期34卷 91-102页

作者： Yuan-qiao li Bao-Ji Zhu Yang Lv Heng Zhu Min lin Ke-Sheng Chen li-Jun Xu China Institute of Atomic Energy Beijing 102413China National Key Laboratory for Metrology and Calibration Techniques Beijing 102413China

To enhance the accuracy of 2πα and 2πβ particle surface emission rate measurements and address the identification issues of nuclides in conventional methods, this study introduces two artificial neural network(ANN) algorithms: back-propagation(BP) and genetic algorithm-based back-propagation(GA-BP). These algorithms classify pulse signals from distinct α and β particles. Their discrimination efficacy is assessed by simulating standard pulse signals and those produced by contaminated sources, mixing α and β particles within the detector. This study initially showcases energy spectrum measurement outcomes, subsequently tests the ANNs on the measurement and validation datasets, and contrasts the pulse shape discrimination efficacy of both algorithms. Experimental findings reveal that the proportional counter's energy resolution is not ideal, thus rendering energy analysis insufficient for distinguishing between 2πα and 2πβ particles. The BP neural network realizes approximately 99% accuracy for 2πα particles and approximately 95% for 2πβ particles, thus surpassing the GA-BP's performance. Additionally, the results suggest enhancing β particle discrimination accuracy by increasing the digital acquisition card's threshold lower limit. This study offers an advanced solution for the 2πα and 2πβ surface emission rate measurement method, presenting superior adaptability and scalability over conventional techniques.

关键词： Pulse shape discrimination Artificial neural networks Alpha and beta sources Multi-wire proportional counter Surface emission rate

在线全文

学校读者我要写书评

暂无评论

基于STM32的多功能可定位蓝牙耳机设计

移动信息 2024年第8期46卷 392-394页

作者：洪晨方晨鑫薛想方贞琪李壮蚌埠学院电子与电气工程学院安徽蚌埠233030

文中设计了一款可定位智能蓝牙耳机,采用低成本、多功能、实用性高的设计思路,以STM32为主控核心,实现了多功能模块化编程。另外,加入温湿度传感器、蜂鸣器等多种传感器,便于实现功能多样化;加入WIFI模块和蓝牙模块,使耳机与手机间的连... 详细信息

文中设计了一款可定位智能蓝牙耳机,采用低成本、多功能、实用性高的设计思路,以STM32为主控核心,实现了多功能模块化编程。另外,加入温湿度传感器、蜂鸣器等多种传感器,便于实现功能多样化;加入WIFI模块和蓝牙模块,使耳机与手机间的连接更加智能化。通过模块化编程,分模块地实现了可定位的智能蓝牙耳机,同时实现了对智能蓝牙的智能控制。

关键词：可定位 STM32 多功能蓝牙耳机