检索结果-南通市图书馆

The (⊿+2,2)-incidence coloring of outerplanar graphs

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2008年第5期18卷 575-578页

作者： Shudong Wanga,b,c, Jin xu a,b, Fangfang Mac, Chunxiang xua,b a Institute of Software, School of Electronic engineering and Computer Science, Peking university, Beijing 100871, China b Key Laboratory of High Con dence Software Technologies, Ministry of Education, Beijing 100871, China c college of information Science and engineering, Shandong university of Science and Technology, qingdao 266510, China Institute of Software School of Electronic Engineering and Computer Science Peking University Beijing 100871 China Key Laboratory of High Confidence Software Technologies Ministry of Education Beijing 100871 China college of information Science and engineering Shandong University of Science and Technology Qingdao 266510 China

An incidence coloring of graph G is a coloring of its incidences in which neighborly incidences are assigned di erent colors. In this paper, the incidence coloring of outerplanar graphs is discussed using the techniques of exchanging colors and the double inductions from the aspect of con guration property. Results show that there exists a (D + 2,2)-incidence coloring in every outerplanar graph, where D is the maximum degree of outerplanar graph.

关键词： Incidence coloring Incidence chromatic number Outerplanar graph

Multiphase Piecewise Smooth Image Segmentation on Implicit Surface

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Multiphase Piecewise Smooth Image Segmentation on Implicit S...

第五届图像图形技术与应用学术会议

作者： Kai xu~1,Zhenkuan Pan~2,Weibo Wei~3 college of information engineering,qingdao university Ningxia Road 308,qingdao,266071

A variational level set model for multiphase piecewise smooth image segmentation on implicit surface is presented in this paper which can be considered as an extension to classic Chan-Vese model used to planar image segmentation. The contours on the surface are expressed via intersections between zero level set of the underlying surface which is fixed and other zero level sets of dynamic level set *** energy functional is constructed using a general characteristic function for surface region partitioning and the definition of intrinsic *** order to avoid the re-initialization of level set functions,the energy functional includes the penalty term of level set functions as signed distance *** evolution equations of level set functions and smooth parameter estimation are derived using variational methods,which are solved through finite difference ***,some numerical experiments validate the variational model and the finite difference schemes suggested in this paper.

关键词： implicit surface piecewise smooth image segmentation smooth parameter estimation variational method multiphase segmentation

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

一种变形杂交算子——轮转杂交算子

计算机工程与应用 2003年第9期39卷 105-106,201页

作者：贺晓丽王翠萍许曰滨赵志刚青岛大学信息工程学院

杂交算子是遗传算法的三个基本算子之一,它在改进解群质量方面发挥着重要作用。现有遗传算法的杂交算子通常选择两个个体组成母本进行杂交运算。该文提出了一种选择三个个体组成母本进行轮转杂交的思想,文章称这种新的杂交算子为轮转杂... 详细信息

杂交算子是遗传算法的三个基本算子之一,它在改进解群质量方面发挥着重要作用。现有遗传算法的杂交算子通常选择两个个体组成母本进行杂交运算。该文提出了一种选择三个个体组成母本进行轮转杂交的思想,文章称这种新的杂交算子为轮转杂交算子。首先通过理论分析证明,它能够扩大遗传算子搜索子空间,使收敛结果更趋于最优解。然后将其用于分布式系统任务调度问题,模拟结果说明是可行的。

关键词：遗传算法杂交算子任务调度搜索空间

天然气水合物物性实验研究进展——第7届国际水合物大会交流成果综述

在线全文

学校读者我要写书评

暂无评论

海洋地质前沿 2012年第2期28卷 29-34页

作者：徐麦玲刘昌岭赵仕俊张磊中国石油大学(华东)信息与控制工程学院青岛266555 青岛海洋地质研究所青岛266071 中国石油大学(华东)石油工程学院青岛266555

天然气水合物的物理性质是勘探和开发天然气水合物的重要基础。基于第七届国际水合物大会(IGGH-7)的交流成果,从水合物合成与分解实验、物性参数测量技术以及数值模拟研究等方面,总结了水合物声学、力学及渗透率、电学、热物理等物性参... 详细信息

天然气水合物的物理性质是勘探和开发天然气水合物的重要基础。基于第七届国际水合物大会(IGGH-7)的交流成果,从水合物合成与分解实验、物性参数测量技术以及数值模拟研究等方面,总结了水合物声学、力学及渗透率、电学、热物理等物性参数的最新实验研究成果及其进展,并对今后的研究工作提出了一些展望和建议。

关键词：天然气水合物 IGGH 7 物性沉积物

Near-field manipulation of terahertz surface waves by metasurfaces [Invited]

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2018年第5期16卷 2-6页

作者： Quan xu xueqian Zhang Yuehong xu Chunmei Ouyang yanfeng Li Jiaguang Han Weili Zhang Center for Terahertz Waves and college of Precision Instrument and Optoelectronics engineering Key Laboratory of Opto-electronics Information and Technical Science Ministry of Education Tianjin University Tianjin 300072 China School of Electrical and Computer engineering Oklahoma State University Stillwater Oklahoma 71078 USA

Surface waves（SWs） are a special form of electromagnetic waves that travel along the boundary between a metal and a dielectric. The special optical properties of SWs render them very attractive in applications, such as subdiffractional lithography, novel biochemical sensors, and ultrafast integrated circuitries. Herein, we present a review of our recent progress in excitation and manipulation of terahertz SWs due to interference or coupling between a pair of slit resonators in metasurfaces, showing the ability to devise ultrathin and compact plasmonic components.

关键词： SW Near-field manipulation of terahertz surface waves by metasurfaces

Effects of dissolved oxygen on intestinal bacterial community and immunity of Atlantic salmon Salmo salar

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and Limnology 2023年第1期41卷 364-375页

作者： Shihong xu yanfeng WANG Caixia GAO Sarath BABU V Jun LI Qinghua LIU Zhizhong XIAO Yingxuan xu Chunyan ZHAO Li LIN Liang CHI Department of Aquatic Animal Medicine College of FisheriesHuazhong Agricultural UniversityWuhan 430070China college of Veterinary Medicine Qingdao Agricultural UniversityQingdao 266109China Laboratory Animal and Comparative Medicine Team State Key Laboratory of Veterinary BiotechnologyHarbin Veterinary Research InstituteChinese Academy of Agricultural Sciences(CAAS)Harbin 150069China CAS Key Laboratory of Experimental Marine Biology Institute of OceanologyChinese Academy of SciencesQingdao 266071China Guangdong Provincial Water Environment and Aquatic Products Security engineering Technology Research Center Guangzhou Key Laboratory of Aquatic Animal Diseases and Waterfowl BreedingZhongkai University of Agriculture and EngineeringGuangzhou 510225China university college London London WC1E 6BTUnited Kingdom School of Marine Science and engineering Qingdao Agricultural UniversityQingdao 266109China

Dissolved oxygen(DO)is one of most important factors which affect wide range physiologic features of including immune responses and intestinal bacterial ***,the underlying mechanisms remain *** address this question,the intestinal bacterial community compositions and the immune features of Atlantic salmon(Salmo salar)grown in recirculating aquaculture systems(RAS)were *** were reared under different DO saturation levels,e.g.,200% saturation named high group(H),100%saturation named control group(CK),and 60%saturation named lower group(L).Large variations in the operational taxonomic units(OTUs)frequency distribution for the intestinal bacterial community of Atlantic salmon were *** intestinal bacterial community of all groups was dominated mainly by three phyla,e.g.,***,and ***,Acinetobacter baumannii,an opportunistic pathogen of salmon was increased significantly in L *** further monitored the immunity features of fish under different DO *** results show that leucocyte number,cortisol level,the expressions of interleukin-1β(IL-1β),Toll-like receptor 4(TLR4),and nucleotide-binding oligomerization domain like protein 2(NOD2)were higher at significant levels in the L group than those in the other two ***4 and NOD2 are usually related with the bacterial infections;therefore,it is reasonable to believe that the stronger immune responses observed in the L group might be related with the higher abundance of *** in the inte stine of Atlantic ***,these findings demonstrated that low DO level may induce stronger immunity responses in Atlantic salmon.

关键词： Atlantic salmon dissolved oxygen(DO) immune responses microbiota intestine

在线全文

学校读者我要写书评

暂无评论

电流型Z源逆变器在风电并网中的应用

通信电源技术 2011年第5期28卷 22-23,27页

作者：谭延超房绪鹏朱明杰山东科技大学信息与电气工程学院山东青岛266510

逆变器是风力发电并网系统的主要部分,而Z源变换器因其具有的诸多优点已成为当今研究的热点。其中逆变器的控制策略是决定系统性能优劣和能否可靠运行的关键。文章在对风力发电并网逆变器系统数学模型分析的基础上,采用三值逻辑SPWM控... 详细信息

逆变器是风力发电并网系统的主要部分,而Z源变换器因其具有的诸多优点已成为当今研究的热点。其中逆变器的控制策略是决定系统性能优劣和能否可靠运行的关键。文章在对风力发电并网逆变器系统数学模型分析的基础上,采用三值逻辑SPWM控制方法进行调制,从而设计出合适的逻辑开关方程来控制电流型Z源逆变器。仿真实验结果表明,该控制策略能获得较好的控制性能,并能实现单位功率因数校正。

关键词：风力并网电流型Z源逆变器脉宽调制

Heterostructured graphene quantum dot/WSe2/Si photo-detector with suppressed dark current and improved detectivity

在线全文

学校读者我要写书评

暂无评论

Nano Research 2018年第6期11卷 3233-3243页

作者： Mengxing Sun Qiyi Fang Dan Xie Yilin Sun Liu Qian Jianlong xu Peng Xiao Changjiu Teng Weiwei Li Tianling Ren yanfeng Zhang Institute ofMicroelectronics & Tsinghua National Laboratory for information Science and Technology (TNList) Tsinghua University Beijing 100084 China Department of Materials Science and engineering College of Engineering Peking University Beijing 100084 China Department of Chemistry Tsinghua University Belling 100084 China Institute of Functional Nano & Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices Soochow University Suzhou 215123 China

A high-performance heterojunction photodetector is formed by combining an n-type Si substrate with p-type monolayer WSe2 obtained using physical vapor deposition. The high quality of the WSe2/Si heterojunction is demonstrated by the suppressed dark current of I nA and the extremely high rectification ratio of 107. Under illumination, the heterojunction exhibits a wide photoresponse range from ultraviolet to near-infrared radiation. The introduction of graphene quantum dots （GQDs） greatly elevates the photodetective capabilities of the heterojunction with strong light absorption and long carrier lifetimes. The GQDs/WSe2/Si heterojunction exhibits a high responsivity of -707 mA·W^-1, short response time of 0.2 ms, and good specific detectivity of -4.51×10^9 Jones. These properties suggest that the GQDs/WSe2/Si heterojunction holds great potential for application in future high- performance photodetectors.

关键词： heterojunction photodetector Si WSe2 graphene quantum dots

Successful transplantation of cryopreserved spermatogonia in Sebastes schlegelii:A simple and suitable alternative approach for conservation of viviparous fish

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

Water Biology and Security 2023年第3期2卷 75-86页

作者： Li Zhou xueying Wang Shuran Du Shihong xu yanfeng Wang Zongcheng Song Qinghua Liu Jun Li The Key Laboratory of Experimental Marine Biology Center for Ocean Mega-ScienceInstitute of OceanologyChinese Academy of SciencesQingdao266071China college of Life Science Ningde Normal UniversityEngineering Research Center of Mindong Aquatic Product Deep-ProcessingFujian Province UniversityNingde352100China Laboratory for Marine Biology and Biotechnology Qingdao National Laboratory for Marine Science and TechnologyQingdao266071China Weihai Shenghang Aquatic Product Science and Technology Co.Ltd. Weihai264200China

Black rockfish(Sebastes schlegelii)is one of the most important marine economic viviparous ***,germplasm degradation and genetic diversity reduction have occurred due to overfishing and long-term artificial *** cell transplantation combined with cryopreservation may be an alternative way to protect genetic ***,in viviparous fish that undertake fertilization and embryo development in vivo,transplantation is more difficult than in oviparous fish,including selection of transplantation stage,isolation of germ stem cells,and preparation of sterile *** seriously restricts the development of viviparous ***,in this study,we aimed to explore a transplantation method suitable for these *** cells were isolated from cryopreserved whole testes of 300–400g male Sebastes schlegelii in May,labeled by PKH26,and intra-peritoneally transplanted into allogeneic larvae at 5–10 days ***,the development of donor-derived cells in recipients were continuously detected by fluorescence labeling,histology,microsatellite markers,and fecundity *** results showed that donors were rich in spermatogonia(75%)and recipients maintained a high survival rate after transplantation,with a rate of>20%at sexual ***,donor-derived cells successfully migrated(100%),colonized,and incorporated into the developing recipient gonad(93.33%).Finally,transplanted recipients could normally develop and differentiate into male and female individuals,with donor-derived gametes found in 65.38%of mature *** the present study,we first establish a simple and suitable transplantation method for Sebastes schlegelii using immature males and specific larvae,which will serve as a promising tool in the protection of germplasm resources for this transplantation-restricted marine viviparous species.

关键词： Allogeneic transplantation Spermatogonia Sebastes schlegelii Germ cells Germplasm