检索结果-南通市图书馆

TCT联合宫颈组织活检对宫颈癌高危患者诊断价值分析

在线全文

学校读者我要写书评

暂无评论

实用妇科内分泌电子杂志 2024年第11期11卷 77-79页

作者：王贻全靖宇县人民医院妇科吉林白山135200

目的探讨液基薄层细胞学检查(TCT)联合宫颈组织活检对宫颈癌(CC)高危患者的诊断价值。方法选取78例CC高危患者,均接受TCT、宫颈组织活检检查。以术后病理学切片检查结果为金标准,比较两种检查方式阳性检出率,并绘制工作特征(ROC)曲线,... 详细信息

目的探讨液基薄层细胞学检查(TCT)联合宫颈组织活检对宫颈癌(CC)高危患者的诊断价值。方法选取78例CC高危患者,均接受TCT、宫颈组织活检检查。以术后病理学切片检查结果为金标准,比较两种检查方式阳性检出率,并绘制工作特征(ROC)曲线,运用曲线下面积(AUC)分析TCT、宫颈组织活检两种检查方式诊断价值。结果78例CC高危患者经术后病理学切片检查显示,有33例(42.31%)确诊为CC;运用TCT检查,有36例(46.15%)为阳性,42例(53.85%)为阴性;运用宫颈组织活检检查,有32例(41.03%)为阳性,46例(58.97%)为阴性。两者联合检查AUC显著大于两者单独检查(P<0.05),且联合检查、宫颈组织活检检查诊断敏感度与特异度高于TCT检查(P<0.05)。结论TCT联合宫颈组织活检检查在CC高危患者疾病诊断方面具有较高价值,有利于提高诊断敏感度与特异度,具有较为理想的诊断价值。

关键词：液基薄层细胞学检查宫颈组织活检宫颈癌高危诊断效能 ROC曲线

Evaluation and Promotion of the Service Capacity of Urban Public Open Spaces Based on Improving Accessibility:A Case Study of Shenyang City,China

在线全文

学校读者我要写书评

暂无评论

Chinese Geographical Science 2021年第6期31卷 1045-1056页

作者： WU Wen wang yiquan Jang Ho Architecture College Liaoning Provincial Key Laboratory of Urban and Architectural Digital TechnologyNortheastern UniversityShenyang110819China

The service capacity of urban public open spaces is an important indicator of the justness and soundness of the allocation of public space resources,such as parks and green spaces,in the process of urban *** the service capacity of urban public open spaces is conductive to healthy,sustainable urban *** this study,taking Shengyang City,China as a case study,a Gaussian-based two-step floating catchment area method(2 SFCA)is used to calculate an accessibility index and identify residential areas with a poor accessibility to urban public open ***,a particle swarm algorithm(PSA)is used to optimize the locations of new open space ***,the optimization results are verified using the analytic network process(ANP).The results show that the service capacity of public open spaces in the center of Shenyang City(covering six districts)is relatively low and exhibits an uneven spatial *** the service scope of the existing urban public open spaces,the accessibility for 48.6%of the residential estates is moderately poor or *** layout is optimized when the number of optimization points is set to *** points are mainly located in old town areas such as the Tiexi,Huanggu,and Dadong *** optimization increases the green space area accessible by motor vehicles(60 min),bicycles(60 min),and walking(30 min)by 4.67%,5.38%,and 8.03%of the study area,***,green space planning recommendations are offered from two perspectives:spatial layout and transport system optimization.

关键词： urban public open space accessibility Gaussian-based two-step floating catchment area method(2SFCA) particle swarm algorithm(PSA) Shenyang City

透镜球差对拉盖尔-高斯涡旋光束聚焦特性的影响及改善方法

在线全文

学校读者我要写书评

暂无评论

光电子．激光 2024年第8期35卷 874-879页

作者：康琦陈笑王义全蔡园园王朝阳史冰耀中央民族大学理学院光子系统工程软件教育部工程研究中心北京100081

涡旋光场调控对涡旋光在激光通信、生物操控等领域的应用研究具有重要意义。为了揭示透镜球差对拉盖尔-高斯(Laguerre-Gaussian, LG)涡旋光束传输特性的影响,本文基于菲涅尔衍射理论,模拟研究了不同透镜球差系数下的LG光束聚焦场的强度... 详细信息

涡旋光场调控对涡旋光在激光通信、生物操控等领域的应用研究具有重要意义。为了揭示透镜球差对拉盖尔-高斯(Laguerre-Gaussian, LG)涡旋光束传输特性的影响,本文基于菲涅尔衍射理论,模拟研究了不同透镜球差系数下的LG光束聚焦场的强度、相位以及螺旋谱分布。结果表明:光学系统初级球差系数的增大恶化了LG光束聚焦场的强度分布和螺旋相位,弥散了轨道角动量(orbital angular momentum, OAM)。由此,本文提出了一种光阑补偿方案,通过在透镜前添加大小合适的圆孔光阑,以消除透镜像差。光阑补偿后的LG光束聚焦场由星芒状空心分布恢复为空心圆环分布,OAM态保持单一稳定。本研究工作为改善透镜像差对涡旋光的传输影响提供了解决方案。

关键词：涡旋光球差透镜轨道角动量(OAM) 螺旋谱圆孔光阑

Engineering the near-field imaging of a rectangular-lattice photonic-crystal slab in the second band

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2009年第1期52卷 87-91页

作者： FENG Shuai AO Ling wang yiquan College of science Central University for NationalitiesBeijing 100081China

Imaging properties of a two-dimensional rectangular-lattice photonic crystal (PC) slab consisting of air holes immersed in a dielectric are studied in this work. The field patterns of electromagnetic waves radiated from a point source through the PC slab are calculated with the finite-difference time-domain method. Comparing the field patterns with the corresponding equifrequency-surface contours simulated by the plane-wave expansion method, we find that an excellent-quality near-field image may be formed through the PC slab by the mechanisms of the simultaneous action of the self-collimation effect and the negative-refraction effect. Near-field imaging may be obtained within two different frequency regions in two vertical directions of the PC slab.

关键词： photonic crystal negative refraction subwavelength imaging

新型5 mm^(2)/s级季戊四醇酯航空发动机润滑油基础油性能研究

在线全文

学校读者我要写书评

暂无评论

石油炼制与化工 2024年第8期55卷 120-128页

作者：王贻全赵梦亚贺景坚梁宇翔刘琼中石化石油化工科学研究院有限公司北京100083

MIL-PRF-23699G Enhanced Ester(EE)增强酯型润滑油标准是目前航空涡轮发动机润滑油极压承载能力和氧化安定性能的最高标准规范。针对双季戊四醇酯的高温氧化安定性弱于单季戊四醇酯,长链脂肪酸不能同时提高季戊四醇酯的氧化安定性与极... 详细信息

MIL-PRF-23699G Enhanced Ester(EE)增强酯型润滑油标准是目前航空涡轮发动机润滑油极压承载能力和氧化安定性能的最高标准规范。针对双季戊四醇酯的高温氧化安定性弱于单季戊四醇酯,长链脂肪酸不能同时提高季戊四醇酯的氧化安定性与极压承载性的问题,采用季戊四醇、己二酸、C_(5)~C_(9)一元脂肪酸,通过直接酯化反应合成了一种新型5 mm^(2)/s级季戊四醇酯基础油,相较于单、双季戊四醇酯混合型基础油,新型季戊四醇酯基础油具有更好的黏温性能与低温流动性,其氧化诱导期与Falex失效负荷提升幅度达到20%以上,解决了现有5 mm^(2)/s级多元醇酯基础油合成技术路线中使用双季戊四醇酯、长链脂肪酸无法兼顾两种性能的问题,为下一代EE增强酯型航空发动机润滑油产品的研发提供一定参考。

关键词：航空涡轮发动机润滑油增强酯季戊四醇酯氧化安定性极压抗磨性

Tunable slow-light multi-mode photonic crystal waveguides based on the coupling of square cavities

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2012年第10期55卷 1769-1775页

作者： FENG Shuai YANG GuoJian LI YuXi CHEN Xiao wang yiquan wang WenZhong School of Science Minzu University of ChinaBeijing 100081China

The light transmission properties through two-dimensional photonic crystal waveguides based on coupling of square cavities are studied by the finite-difference time-domain *** interlacing the adjacent cavities along the direction vertical to the waveguide,the coupling distance between the adjacent cavities is extended,and the group velocity of the guiding modes can be slowed by five-fold compared with that in *** of the different spatial field distributions of various resonant modes,the corresponding group velocities are also different for the same CROW structure.

关键词： photonic crystal coupled-resonator optical waveguide group velocity

Absolute band gaps of a two-dimensional triangular-lattice dielectric photonic crystal with different shapes

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2010年第10期53卷 1788-1792页

作者： FENG Shuai YANG YuPing LAN ChuWen BAI ZhenZhen wang yiquan School of Science Minzu University of ChinaBeijing 100081China

Absolute band gaps of a two-dimensional triangular-lattice photonic crystal are calculated with the finite-difference time-domain method in this *** calculating the photonic band structures of the triangular-lattice photonic crystal consisting of Ge rods immersed in air with different shapes,it is found that a large absolute band gap of 0.098 (2c/a) can be obtained for the structures with hollow triangular Ge rods immersed in air,corresponding to 19.8% of the middle *** influence of the different factors on the width of the absolute band gaps is also discussed.

关键词： photonic crystal absolute band gap triangular lattice

Long-term agricultural activity affects anthropogenic soil on the Chinese Loess Plateau

在线全文

学校读者我要写书评

暂无评论

Journal of Arid Land 2017年第5期9卷 678-687页

作者： LI Xiaoyun wang yiquan Mark E REYNOLDS LI Xiaoping LU Xinwei School of Geography and Tourism Shaanxi Normal University Xi'an 710119 China SNNU-JSU Joint Research Center for Nano-environment Science and Health Xi'an 710119 China College of Resources and Environment Northwest A&F University Yangling 712100 China Stockbridge School of Agriculture University of Massachusetts Massachusetts 01003 USA

Anthropogenic activities largely influence the soil quality of agricultural fields and the composition of soil. Samples of typical anthropogenic Loutu soil in the Guanzhong area of the Loess Plateau, Shaanxi Province, China were collected and measured for soil compaction, bulk density, total organic carbon（TOC）, active organic carbon（AOC）, and soil enzyme activities to investigate spatial variations in soil quality. The results indicate that soil compaction and bulk density increased with increasing distance from the farm village, whereas soil TOC, AOC, and soil enzyme activities firstly increased and subsequently decreased with increasing distance from the farm village. All of the tested parameters presented clear concentric distribution. Vertically, soil compaction and bulk density in the topsoil were lower than those in the subsoil, but all other tested parameters in the topsoil were significantly higher than those in the subsoil. In addition, there was a significant positive correlation between organic carbon content and enzyme activities, confirming that the spatial distribution of Loutu soil characteristics has been affected by long-term anthropogenic activities to some extent. The results of this study imply that the use of farmyard manure and appropriate deep plowing are important and effective ways to maintain and improve soil quality.

关键词： anthropogenic soil spatial variation organic carbon enzyme activity soil quality

Amphioxus Gli knockout disrupts the development of left–right asymmetry but has limited impact on neural patterning

在线全文

学校读者我要写书评

暂无评论

Marine Life Science & Technology 2023年第4期5卷 492-499页

作者： Xin Huang Qiongqiong Ren yiquan wang Sebastian M.Shimeld Guang Li State Key Laboratory of Cellular Stress Biology School of Life SciencesXiamen UniversityXiamen 361005China Department of Zoology University of OxfordOxford OX13SZUK

The Gli transcription factors are the primary mediators of Hedgehog(Hh)*** genomes contain multiple Gli paralogues with different functions downstream of Hh signal receipt,in part explaining the complexity of cellular responses to Hh that allow concentration-dependent target gene *** is a chordate that split from the vertebrate lineage early in the evolution of chordates,before the genome duplications that occurred in early vertebrate *** has a single Gli gene whose transcripts can be alternately spliced to yield two protein isoforms called GliS and *** generated two knockout mutations in amphioxus Gli,one that affects the whole gene and a second that only affects *** knockouts showed major morphological and molecular defects in the development of left–right asymmetry,a phenotype that is similar but not identical to that previously found in Hh *** signaling also patterns the amphioxus neural ***,however,knockout of GliL showed no identifiable phenotype,while knockout of the full gene showed only small changes to the expression of one gene family,*** genes that were prominently affected by Hh knockout were not altered in expression in either *** for the differences between Hh and Gli knockouts in the pharynx and neural tube are discussed in the context of the likely different functions of amphioxus Gli isoforms.

关键词： Hh signaling pathway Chordates Embryonic development Evolution