检索结果-南通市图书馆

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

结直肠肿瘤手术的质量控制

中华胃肠外科杂志 2024年第6期27卷 559-563页

作者：楼征张卫海军军医大学长海医院结直肠外科上海200433

手术是结直肠癌获得根治的主要手段。以腹腔镜和机器人手术为代表的微创外科治疗已逐渐成为现阶段结直肠肿瘤手术的主流方式。与此同时,功能保留手术治疗理念的兴起,使人们从单纯强调肿瘤学根治转变为强调根治与器官功能保护两者并重的... 详细信息

手术是结直肠癌获得根治的主要手段。以腹腔镜和机器人手术为代表的微创外科治疗已逐渐成为现阶段结直肠肿瘤手术的主流方式。与此同时,功能保留手术治疗理念的兴起,使人们从单纯强调肿瘤学根治转变为强调根治与器官功能保护两者并重的治疗目的。结直肠肿瘤手术实施的质量化控制包括手术资质准入制度、考核制度、手术方式和指征、手术关键技术(正确层面拓展、淋巴结清扫区域和切除范围、神经保护与功能保留以及消化道重建和术中并发症防治)等。统一规范的手术实施质量控制不仅是决定患者预后和生活质量的关键因素,也是确保相关临床研究结论准确性的重要前提。

关键词：结直肠肿瘤手术质量控制

Photodetector based on Ruddlesden-Popper perovskite microwires with broader band detection

在线全文

学校读者我要写书评

暂无评论

Journal of Semiconductors 2023年第8期44卷 41-47页

作者： Yongxu Yan Zhexin Li zheng lou State Key Laboratory for Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronic Engineering University of Chinese Academy of SciencesBeijing 100049China

Recently,the two-dimensional(2D)form of Ruddlesden-Popper perovskite(RPP)has been widely studied.However,the synthesis of one-dimensional(1D)RPP is rarely reported.Here,we fabricated a photodetector based on RPP microwires(RPP-MWs)and compared it with a 2D-RPP photodetector.The results show that the RPP-MWs photodetector possesses a wider photoresponse range and higher responsivities of 233 A/W in the visible band and 30 A/W in the near-infrared(NIR)band.The analyses show that the synthesized RPP-MWs have a multi-layer,heterogeneous core-shell structure.This structure gives RPP-MWs a unique band structure,as well as abundant trap states and defect levels,which enable them to acquire better photoresponse performance.This configuration of RPP-MWs provides a new idea for the design and application of novel heterostructures.

关键词： Ruddlesden-Popper perovskite microwires photodetector core-shell heterojunction

在线全文

学校读者我要写书评

暂无评论

用户生成内容场景下角色导向图神经推荐方法

计算机学报 2024年第6期47卷 1288-1303页

作者：娄铮铮朱军娇张万闯吴宾郑州大学计算机与人工智能学院郑州450001

近年来互联网的飞速发展不断改变着信息的生产和传递方式,随之出现了用户使用互联网的新方式——用户生成内容(User-Generated Content,UGC).该场景中内容以传播速度快、获取成本低等优势迅速占据互联网信息传播的重要地位.不同于传统... 详细信息

近年来互联网的飞速发展不断改变着信息的生产和传递方式,随之出现了用户使用互联网的新方式——用户生成内容(User-Generated Content,UGC).该场景中内容以传播速度快、获取成本低等优势迅速占据互联网信息传播的重要地位.不同于传统推荐场景,UGC场景下用户同时扮演生产者和消费者双重角色,这使得在构建推荐模型时既需要考虑消费者与内容之间的交互信息,也需关注内容生产者对于消费者决策的影响.因此,UGC场景下个性化推荐算法研究的关键在于如何充分挖掘消费者-内容和消费者-生产者之间的关联关系.在面向UGC场景的推荐研究中,比较有代表性的模型为CPRec,该模型虽取得一定进展,但仍存在两点不足之处.其一,在模型构建层面,未能显式建模消费者-内容与消费者-生产者之间的高阶连通关系,难以学习出高质量的节点表征.其二,在模型优化层面,无法区分每个观测数据在不同训练阶段的贡献度,将影响推荐结果的质量.为此,本文提出一种新颖的角色导向图神经推荐方法RGNRec(Role-Guided Graph Neural Recommendation)用于UGC场景的个性化排序任务.特别地,基于用户的历史行为数据与内容的创作者信息分别构建了消费者-内容交互图和消费者-生产者交互图.进一步,为了显式捕获两种交互图中的高阶连通信息,构建一种双通道线性传播模块,同时刻画了消费者兴趣与内容生产者影响的扩散过程.最终,提出设计一种自适应的正样本权重生成策略,将其融入非采样损失函数,并建立双层优化机制来学习模型的参数.本文的核心贡献包括:(1)引入双通道线性传播模块,以显式解耦出自身兴趣与内容生产者效应对于用户偏好建模的不同贡献度;(2)提出权重自适应的非采样损失函数,以解决不同观测样例在模型不同训练阶段贡献不同的问题.本文分别采用经典的和最先进的图神经网络方法作为基准,在3个UGC场景Pinterest、Recipes和Reddit下进行了实验对比.在整体推荐性能方面,无论模型精度亦或训练效率上均优于各基准方法,尤其在Precision@10指标上获得了 4.31%~17.83%的提升;然后通过消融实验验证了双通道线性传播模块和权重自适应优化机制的合理性与必要性;最后通过实验验证了本文方法在缓解数据稀疏和用户冷启动方面的优越性.

关键词：推荐系统图神经网络用户生成内容双重角色非采样学习

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

结直肠癌手术路径的质量控制

中华胃肠外科杂志 2024年第6期27卷 569-573页

作者：高逸张晨鸣楼征张卫海军军医大学长海医院麻醉科上海200433 海军军医大学长海医院结直肠外科上海200433

规范化的结直肠癌诊治流程是保障医疗质量和安全的关键。结直肠癌手术实施路径的质量控制与器官功能保留、避免术后出现并发症、降低术后复发转移率以及延长患者生存期密切相关。而手术实施路径的质量控制的具体实施过程涉及多学科和诊... 详细信息

规范化的结直肠癌诊治流程是保障医疗质量和安全的关键。结直肠癌手术实施路径的质量控制与器官功能保留、避免术后出现并发症、降低术后复发转移率以及延长患者生存期密切相关。而手术实施路径的质量控制的具体实施过程涉及多学科和诊治的多阶段,其中强化围手术期管理是加速患者术后康复、改善患者预后的重要环节;建立规范的培训与有效的督查体系是结直肠癌手术质量的重要保障。

关键词：结直肠肿瘤手术路径质量控制

Self-healing Au/PVDF-HFP composite ionic gel for flexible underwater pressure sensor

在线全文

学校读者我要写书评

暂无评论

Journal of Semiconductors 2023年第3期44卷 76-94页

作者： Ruiyang Yin Linlin Li Lili Wang zheng lou State Key Laboratory for Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronic Engineering University of Chinese Academy of SciencesBeijing 100083China Department of Materials Science and Engineering College of EngineeringPeking UniversityBeijing 100871China

Ionic gels can be potentially used in wearable devices owing to their high humidity resistance and non-volatility.However,the applicability of existing ionic gel pressure sensors is limited by their low sensitivity.Therefore,it is very import-ant to develop an ionic gel pressure sensor with high sensitivity and a wide pressure detection range without sacrificing mechan-ical stretchability and self-healing ability.Herein,we report an effective strategy for developing pressure sensors based on ion-ic gel composites consisting of high-molecular-weight polymers,ionic liquids,and Au nanoparticles.The resulting capacitive pressure sensors exhibit high pressure sensitivity,fast response,and excellent self-healing properties.The sensors composed of highly hydrophobic polymers and ionic liquids can be used to track underwater movements,demonstrating broad application prospects in human motion state monitoring and underwater mechanical operations.

关键词： ionic gel pressure sensor high performance underwater operation self-healing

edical Care Experiences of the 30^th Chinese Antarctic Research Expedition： A Retrospective Study

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2015年第3期128卷 398-400页

作者： zheng lou Xue-Hui Gu Hai-Zhong Zhong Department of Colorectal Surgery Changhai Hospital of The Second Military Medical University Shanghai 200433 China Department of Field Medical Station Changhai Hospital of The Second Military Medical University Shanghai 200433 China

China has begun Antarctic scientific research expeditions since 1984. The 30^th Chinese Antarctic expedition summer team boarded the Xuelong vessel at Shanghai, China on November 7, 2013. This expedition team spent more than three months in Antarctica until the offloading of supplies and scientific activities were completed. Effective medical care plays an important role in ensuring scientific research expedition teams to complete their missions. However, medical care of Antarctic expeditions is complex because the characteristics of medical conditions in Antarctic expeditions are largely unknownYi The present study describes the characteristics of medical conditions encountered in the 30^th Chinese Antarctic summer scientific research expedition. Given this study results, a better and more effective medical care may be provided in future Antarctic scientific research expeditions.

关键词： Antarctic Research Expedition Diseases Injury Medical Care Summer Team

High-performance rigid and flexible ultraviolet photo- detectors with single-crystalline ZnGa2O4 nanowires

在线全文

学校读者我要写书评

暂无评论

Nano Research 2015年第7期8卷 2162-2169页

作者： zheng lou Ludong Li Guozhen Shen State Key Laboratory for Superlattices and Microstructures Institute of Semiconductors Chinese Academy of Sciences Beijing100083 China These authors contribute equally to this work.

ZnGa2O4 nanowires （NWs） as a ternary oxide semiconductor were successfully synthesized by a simple vapor transport method for application as high- performance ultraviolet （UV） photodetectors. A single-nanowire UV photodetector fabricated on a rigid silicon substrate exhibited excellent spectral responsivity （3,174 A/W） and high external quantum efficiency （1.1 - 106%） at 350 nm UV light illumination. A flexible single-nanowire photodetector on a polyethylene terephthalate （PET） substrate was also fabricated and showed similar properties. The as-fabricated flexible photodetector exhibited stable electrical properties and mechanical flexibility under different bending curvatures over many cycles, indicating its potential application in future flexible photoelectronic devices.

关键词： nanowires,temary oxide, ZnGa2O4,UV photodetectors,flexible electronics

Highly sensitive hybrid nanofiber-based room-temperature CO sensors： Experiments and density functional theory simulations

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2018年第2期11卷 1029-1037页

作者： Lili Wang Ruiqing Chai zheng lou Guozhen Shen State Key Laboratory on Integrated Optoelectronics College of Electronic Science and Engineering Jilin University Changchun China State Key Laboratory for Superlattices and Microstructures Institute of Semiconductors Chinese Academy of Sciences Beijing China College of Materials Science and Opto-electronic Technology University of Chinese Academy of Sciences Beijing China

Chemical sensors （CSs） are an emerging area in nanoscience research, which focuses on the highly sensitive detection of toxic and hazardous gases and disease- related volatile organics. While the field has advanced rapidly in recent years, it lacks the theoretical support required for the rational design of innovative materials with tunable measurement responses. Herein, we present a one-dimensional （1D） hybrid nanofiber decorated with ultrafine NiO nanoparticles （NiO NPs） as an efficient active component for CSs. Highly dispersed （110）-facet NiO NPs with a high percentage of Ni2~ active sites with unsaturated coordination were confined in a TiO2 nanofiber （TiO2 NF） matrix that is favorable for surface catalytic reactions. The CSs constructed using the 1D heterostructure NiO/TiO2 nanofibers （NiOdrio2 HNFs） exhibited a highly selective response to trace CO gas molecules （1 ppm） with high sensitivity （AR/Ro = 1.02）, ultrafast response/ recovery time （T 〈 20 s）, and remarkable reproducibility at room tem- perature. The density functional theory （DFT） simulations and experimental results confirmed that the selective response could be attributed to the high molecular adsorption energy of the NiO nanoparticles with （110） facets and abundant interfaces, which act synergistically to promote CO adsorption and facilitate charge transfer.

关键词： hybrid nanofiber,high active facet,gas sensor,selectivity,highly sensitive,density functional theory

Modify Cd3As2 nanowires with sulfur to fabricate self-powered NIR photodetectors with enhanced performance

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2021年第10期14卷 3379-3385页

作者： Yongxu Yan Wenhao Ran Zhexin Li Linlin Li zheng lou Guozhen Shen State Key Laboratory for Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronic Engineering University of Chinese Academy of SciencesBeijing 100049China

Cd_(3)As_(2)nanowires(NWs)have great potential in the near-infrared(NIR)photodetection field due to their excellent optoelectronic properties as a typical Dirac semimetal.However,the existence of surface oxidization limits their photoresponse performance for practical applications.Here,we modified the surface of Cd_(3)As_(2)NWs with sulfur to prevent surface oxidizing and optimize the bandgap structure to improve the photoresponse performance.The S-modified Cd_(3)As_(2)samples existed as core/shell Cd_(3)As_(2)/CdS NWs and the corresponding single NW device showed a responsivity of 0.95 A/W in the NIR band at a 0 V bias,which is three orders of magnitude higher than that of an unmodified NW.This study provides an efficient and universally applicable way to prevent semimetals nanostructures from oxidizing and promote their optoelectronic properties.

关键词： near-infrared photodetector Cd_(3)As_(2) nanowires core-shell structure self-powered