检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

甜瓜KASP标记开发及指纹图谱构建

中国瓜菜 2024年第9期37卷 9-17页

作者：肖玉珍张瑞青张跃星代雪张勇王中元于蓉侯尹婕张显魏春华西北农林科技大学园艺学院陕西杨凌712100 宁夏农林科学院园艺研究所银川750000

为丰富甜瓜分子标记类型,并为后续甜瓜种质、品种及种子纯度鉴定提供简便、高效的检测方法,分别在甜瓜每条染色体上挑选6个核心SNP位点,共72个标记,通过KASP技术对11份甜瓜种质进行基因分型,确定了45对具有较好分型效果的标记,标记设计... 详细信息

为丰富甜瓜分子标记类型,并为后续甜瓜种质、品种及种子纯度鉴定提供简便、高效的检测方法,分别在甜瓜每条染色体上挑选6个核心SNP位点,共72个标记,通过KASP技术对11份甜瓜种质进行基因分型,确定了45对具有较好分型效果的标记,标记设计成功率为62.5%。从45对分型较好的标记中挑选25个基因型分簇集中的最优标记,对31份甜瓜种质进行基因分型,明确了各种质在25个SNP位点的多态性,通过聚类分析,分成了3组,并构建了31份甜瓜种质的指纹图谱,为甜瓜种质资源利用和种子纯度鉴定提供了参考。

关键词：甜瓜 KASP SNP 指纹图谱

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

模拟退火算法用于蒸汽吞吐井流入动态研究

石油化工应用 2024年第7期43卷 36-39,59页

作者：辛文宾王中元宫宇宁蒋海岩王哲田蕃尚晨浩西安石油大学石油工程学院陕西西安710065 中国石油辽河油田分公司勘探开发研究院辽宁盘锦124010 中国石化西北油田分公司新疆乌鲁木齐830011

随着油气田开发技术的发展,利用复杂结构井、体积压裂、多元及复杂热力法开采石油时,渗流过程越来越复杂,油井流入动态难以通过统一方程得到。本文提出利用非数值算法的模拟退火算法进行油井流入动态计算,以蒸汽吞吐井为实例,首先分析... 详细信息

随着油气田开发技术的发展,利用复杂结构井、体积压裂、多元及复杂热力法开采石油时,渗流过程越来越复杂,油井流入动态难以通过统一方程得到。本文提出利用非数值算法的模拟退火算法进行油井流入动态计算,以蒸汽吞吐井为实例,首先分析合理的工作制度,然后把模拟退火算法预测的产量结果与利用数值模拟所得的产量结果进行比较。结果表明,两种方法对比误差非常小,模拟退火算法不需要将单相流和多相流分开讨论,且无任何假设条件,适用范围广,利用该算法研究油井流入动态非常可行。

关键词：油井流入动态蒸汽吞吐数值模拟模拟退火油井产量

YOLO-MFD:Remote Sensing Image Object Detection with Multi-Scale Fusion Dynamic Head

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2024年第5期79卷 2547-2563页

作者： zhongyuan Zhang Wenqiu Zhu School of Computer Science Hunan University of TechnologyZhuzhou412007China

Remote sensing imagery,due to its high altitude,presents inherent challenges characterized by multiple scales,limited target areas,and intricate *** inherent traits often lead to increased miss and false detection rates when applying object recognition algorithms tailored for remote sensing ***,these complexities contribute to inaccuracies in target localization and hinder precise target *** paper addresses these challenges by proposing a solution:The YOLO-MFD model(YOLO-MFD:Remote Sensing Image Object Detection withMulti-scale Fusion Dynamic Head).Before presenting our method,we delve into the prevalent issues faced in remote sensing imagery ***,we emphasize the struggles of existing object recognition algorithms in comprehensively capturing critical image features amidst varying scales and complex *** resolve these issues,we introduce a novel ***,we propose the implementation of a lightweight multi-scale module called *** module significantly improves the model’s ability to comprehensively capture important image features by merging multi-scale feature *** effectively addresses the issues of missed detection and mistaken alarms that are common in remote sensing ***,an additional layer of small target detection heads is added,and a residual link is established with the higher-level feature extraction module in the backbone *** allows the model to incorporate shallower information,significantly improving the accuracy of target localization in remotely sensed ***,a dynamic head attentionmechanism is *** allows themodel to exhibit greater flexibility and accuracy in recognizing shapes and targets of different ***,the precision of object detection is significantly *** trial results show that the YOLO-MFD model shows improvements of 6.3%,3.5%,and 2.5%over the original YOLOv8 model in Precision,map@0.5 a

关键词： Object detection YOLOv8 multi-scale attention mechanism dynamic detection head

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

贵州省医院药学服务及收费的认知情况分析

医药导报 2024年第9期43卷 1410-1415页

作者：李冬梅杨茜孙水梅何玲吴帝容刘明吉陈萍萍王立斌王忠元张宏朱珠白雪盛长城张家兴卢蕾王雪陈琦贵州省人民医院药剂科贵阳550002 贵阳市第一人民医院药剂科贵阳550002 黔南州人民医院药剂科都匀558000

目的调研贵州省内医院药学服务现状及认知情况,为探索和开展药学服务收费提供参考。方法通过“问卷星”网站设计调查问卷,以药师、医师/护士、患者为调研对象,并针对这3类人群设计问卷,问卷中部分题目有相应差异。问卷通过微信、丁香... 详细信息

目的调研贵州省内医院药学服务现状及认知情况,为探索和开展药学服务收费提供参考。方法通过“问卷星”网站设计调查问卷,以药师、医师/护士、患者为调研对象,并针对这3类人群设计问卷,问卷中部分题目有相应差异。问卷通过微信、丁香园等网络平台发布。结果调研共发放正式问卷655份,回收有效问卷639份,有效回收率97.56%。被调查者中药师324名(50.70%),医师和护士82名(12.83%),患者233名(36.46%),这3类人群对药学服务收费的赞同度均值分别为4.67、4.23、4.22分(满分为5分)。结论总体上药师的专业服务受到了来自医护人员及患者的支持,但目前患者所接触的药学服务项目仍以调剂服务为主,医护人员和患者对药学服务的认识有待提高,可通过提升药师队伍专业能力、加强宣传和引导、探索“互联网+药学服务”等方面提高药师工作的认可度、公众对药学服务的知晓率,以促进药学服务的持续发展。

关键词：药学服务药学服务费认知

ON THE FORMATION OF THE BULGE IN A SPILLING BREAKING WATER WAVE

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 1997年第3期9卷 41-48页

作者： wang, zhongyuan Nadine, Aubry Jim, H.Duncan Nanjing Univ of Science and Technology Nanjing China

The early stages of a spilling breaking water wave leading to the formation of a bulge on the forward face of the wave are investigated. In this study, simultaneous space-time measurements of the free-surface elevation of a spilling breaking water wave are recorded and analyzed. The analysis, carried out in the frame of reference moving with the crest of the wave,reveals that the formation of the bulge is due to the presence of a shock-like mode. In the previous frame of reference, the shock itself is unsteady but its (spatial) location is time independent and coincides with the 'toe' of the bulge. As time increases, the shock undergoes a flip (a reflection symmetry) with respect to the midpoint of our time interval. Such a flip is responsible for an abrupt increase of the wave steepe-ness, which will lead to wave breaking at later times. Following these observations, we present a two-dimensional quantitative model which reproduces both the formation of the bulge and the sudden increase of the wave steepeness.

关键词： hydrodynamics,turbulence water wave,data analysis

在线全文

学校读者我要写书评

暂无评论

文学本质论的存在论探究

文艺理论研究 2018年第3期38卷 209-216页

作者：王中原河南大学文艺学研究中心

当代的文学反本质论在解构主义的语境下重新提出了文学本质论为何及其何以可能的问题,对上述问题的回应需要从存在论层面对文学本质论的内涵及其可能性进行探讨。文学的本质指涉文学存在,文学本质论是对文学存在的理论阐释。文学本质论... 详细信息

当代的文学反本质论在解构主义的语境下重新提出了文学本质论为何及其何以可能的问题,对上述问题的回应需要从存在论层面对文学本质论的内涵及其可能性进行探讨。文学的本质指涉文学存在,文学本质论是对文学存在的理论阐释。文学本质论是文学研究的首要课题、文艺学的元理论。文学本质论奠基其中的存在论区域显示为"文学是什么""文学如何是"和"文学是"三个区间的区分着的统一。对文学本质论的存在论区域的清查,使形形色色的文学本质论的合法性根据及其边界得以洞察,从而使具体形态的文学本质论的本质性力量得以释放,文学理论研究乃至文学研究由此才得到源始的奠基。

关键词：文学的本质文学存在文学研究文学反本质论

3D Perception Algorithms: Towards Perceptually Driven Compression of 3D Video

在线全文

学校读者我要写书评

暂无评论

ZTE Communications 2013年第1期11卷 11-16页

作者： Ruimin Hu Rui Zhong zhongyuan wang Zhen Han National Engineering Research Center for Multimedia Software School of ComputerWuhan University

In this paper, we summarize 3D perception-oriented algorithms for perceptually driven 3D video coding. Several perceptual ef- fects have been exploited for 2D video viewing; however, this is not yet the case for 3D video viewing. 3D video requires depth perception, which implies binocular effects such as con fl icts, fusion, and rivalry. A better understanding of these effects is necessary for 3D perceptual compression, which provides users with a more comfortable visual experience for video that is de- livered over a channel with limited bandwidth. We present state-of-the-art of 3D visual attention models, 3D just-notice- able difference models, and 3D texture-synthesis models that address 3D human vision issues in 3D video coding and trans-mission.

关键词： 3D perception 3D visual attention 3D just-noticeable differ-ence 3D texture-synthesis 3D video compression

Pyrolysis Empirical Modeling of Polyester Glass Fiber Reinforced Plastics Using Sestak-Berggren Model Method

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2024年第2期33卷 725-738页

作者： NAN Wei JI Wenhui YUAN Yanping YUAN zhongyuan SUN Yong School of Mechanical Engineering Southwest Jiaotong UniversityChengdu610031China CRRC Changchun Railway Vehicles Co. LtdChangchun130062China

Polyester Glass Fiber Reinforced Plastic(Polyester GFRP),a thermosetting plastic comprised of glass fiber and polyester polymer compounds,is extensively utilized in high-speed *** its pyrolysis mechanism is crucial as it significantly influences the combustion characteristics and fire safety ***,kinetic research on polyester GFRP primarily focuses on employing the Coats-Redfern method to derive a theoretical kinetic ***,the pyrolysis process of polyester GFRP is complex and the aforementioned theoretical model fails to accurately describe the pyrolysis ***,this study seeks to utilize the Sestak and Berggren(SB) model as a methodological approach to reveal the complex reaction mechanism during the pyrolysis *** on thermogravimetric analysis,the entire pyrolysis process of polyester GFRP is divided into two primary ***,model-free methods are employed to ascertain the activation energy and pre-exponential *** results show that the fitted empirical models of the two main pyrolysis stages are f(α)=(1-α)^(1.47)[-ln(1-α)]^(1.50) and f(α)=(1-α)^(1.77)[-ln(1-α)]^(1.72),*** predicted results are in good agreement with experimental data under different heating rates,which indicates that the empirical model can sufficiently describe the pyrolysis process of polyester GFRP.

关键词： polyester GFRP model-fitting methods empirical models pyrolysis

Promotion effect of epoxy group neighboring single-atom Cu site on acetylene hydrochlorination

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第6期35卷 258-262页

作者： Junchen Peng Xue Yin Dandan Dong zhongyuan Guo Qinqin wang Minmin Liu Fei He Bin Dai Chaofeng Huang School of Chemistry and Chemical Engineering/State Key Laboratory Incubation Base for Green Processing of Chemical Engineering Shihezi UniversityShihezi 832000China College of Chemistry&Chemical Engineering Yantai UniversityYantai 264010China School of Material Science and Engineering University of JinanJi’nan 250022China

Carbon materials have been used as the support for catalysts in the field of acetylene hydrochlorination,the influence of inevitable oxygen-containing moieties on the reaction is often ignored and the mechanism of the oxygen-doping structure remains ***,we explored the effect of the oxygen-containing group(C-O-C)in the support on the activity of single-atom dispersed Cu *** immersing the Cu single-atom catalyst in an alkaline solution,the epoxy species on the carbon support was cleaved to obtain a pure ether species while the Cu site was modified to a more electron-deficient *** turnover frequency value of Cu/O-FLP catalyst with epoxy groups was 1.6-fold higher than that of alkaline treated *** result indicated that the epoxy groups could assist adjacent single-atom Cu sites to synergistically promote the adsorption and cleavage of the reactant hydrogen chloride toward form C-OH and Cu-Cl bonds,and reduce the reaction energy *** presence of electron deficient Cu sites and ether species could induce competitive adsorption of the acetylene and hydrogen chloride,thereby reducing the activity of the *** study highlights the influence of surface oxygen species and the tunability of the support,providing the foundation for the fabrication of higher-activity Cu catalysts for acetylene hydrochlorination.

关键词： Epoxy group Acetylene hydrochlorination Single-atom Cu catalyst Synergistic dissociation