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

引用评论证据视角下高水平论文遴选研究

情报学报 2024年第7期43卷 789-801页

作者：马瑞敏冯玉梅宋国庆山西大学经济与管理学院太原030006 山西大学科学评价研究中心太原030006

论文作为科研成果的重要表现形式,在“破五唯”的大背景下,科学遴选高水平论文至关重要,是保障代表作评价工作落地的基本抓手。引用评论是学术共同体对论文价值最直接的认可,亦是学术评价的实质性关键证据,对其内容进行深入挖掘有助于... 详细信息

论文作为科研成果的重要表现形式,在“破五唯”的大背景下,科学遴选高水平论文至关重要,是保障代表作评价工作落地的基本抓手。引用评论是学术共同体对论文价值最直接的认可,亦是学术评价的实质性关键证据,对其内容进行深入挖掘有助于更科学地发现高水平论文。首先,本文基于学术认同理论和证据特征阐释了模型构建的基本思想;其次,对基于内容语义的引用情感和引用功能进行重新界定和分类,并充分考虑“施引作者可信度”,构建高水平论文遴选综合加权模型;再其次,选取化学领域顶级刊物Angewandte Chemie-International Edition中的相关论文展开实证研究,结果表明,本文提出的模型可以较精准地筛选出“非常重要论文(very important paper,VIP)”;最后,与其他主流评价指标进行比较分析,证实了本文模型具有较高的区分度和鉴别度,在论文学术水平评价中具有显著优越性。

关键词：引用评论论文证据评价高水平

资源分散型传统村落保护与利用方式研究——以四川两个传统村落为例

在线全文

学校读者我要写书评

暂无评论

小城镇建设 2024年第4期42卷 100-107页

作者：李志新何子怡宋国庆中国建筑设计研究院有限公司城镇规划设计研究院历史所中国城市发展规划设计咨询有限公司文化和旅游研究中心

资源分散型传统村落主要指传统建筑资源在村域分布比较分散,与农田等用地交叉分布的传统村落。资源分散型传统村落在保护区划与管控措施、保护利用方式方面均区别于资源集中型村落。本文以四川省泸州市泸县石牌坊村、自贡市大安区三多... 详细信息

资源分散型传统村落主要指传统建筑资源在村域分布比较分散,与农田等用地交叉分布的传统村落。资源分散型传统村落在保护区划与管控措施、保护利用方式方面均区别于资源集中型村落。本文以四川省泸州市泸县石牌坊村、自贡市大安区三多寨村为例,分析两个传统村落资源分散的特点和区别,由传统建筑分散性引出村落格局特色价值,提出保护和利用的方式,并进行方法总结,以期对全国范围内资源分散型传统村落的保护与利用方式方法研究有所启发。

关键词：资源分散传统村落保护利用石牌坊村三多寨村

蛇形空间机械臂单个2-DOF关节的运动学标定

在线全文

学校读者我要写书评

暂无评论

机床与液压 2024年第3期52卷 1-9页

作者：宋国庆赵成浩袁俊杰张忠海何广平北方工业大学机械与材料工程学院北京100144 北京航天测控技术有限公司北京100041

绳索驱动的分段式蛇形空间机械臂通常具有相同结构的模块化关节,能够在狭小空间中灵巧操作,其精度是制约机器人发展的主要因素。为了提高蛇形空间机械臂的位置精度,指导蛇形空间机械臂的精度设计,以单个2-DOF关节为对象,提出一种正则化... 详细信息

绳索驱动的分段式蛇形空间机械臂通常具有相同结构的模块化关节,能够在狭小空间中灵巧操作,其精度是制约机器人发展的主要因素。为了提高蛇形空间机械臂的位置精度,指导蛇形空间机械臂的精度设计,以单个2-DOF关节为对象,提出一种正则化的运动学标定方法。首先,对具有多重映射关系的2-DOF关节的运动学进行分析,通过矩阵全微分理论建立包含所有几何误差参数的误差模型。然后,对2-DOF关节各部件的所有误差源进行灵敏度分析,依据3σ原则和理想的位置精度设计指标指导各部件的公差设计。最后,考虑所有的制造和装配误差,采用正则化方法对2-DOF关节进行误差辨识,用于补偿控制器中的名义运动学模型。结果表明,经过修正后的运动学模型的位置精度提高了50%,验证了运动学标定的有效性。

关键词：运动学误差分析灵敏度分析运动学标定精度设计

A Case Report of One-Point Gastric Cancer

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Clinical Oncology 2008年第4期5卷 309-310页

作者： guoqing song Qiang Wang Department of Gastrointestinal Surgery Shengjing Hospital of China Medical University Shenyang 110004 Liaoning ProvinceChina.

Carcinoma of the stomach is the most common malignant tumor in China. Due to advanced endoscopic techniques and equipment, the detection of early gastric carcinoma （EGC） has increased worldwide. Yet gastric one-poin... 详细信息

关键词： gastric one-point cancer early gastric cancer endoscopic mucosal resection endoscopic submucosaldissection.

Optimal Bidding Strategy for PV and BESSs in Joint Energy and Frequency Regulation Markets Considering Carbon Reduction Benefits

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2024年第2期12卷 427-439页

作者： Jing Bian Yuheng song Chen Ding Jianing Cheng Shiqiang Li guoqing Li Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology Ministry of Education Northeast Electric Power UniversityJilin 132000China Datang Northeast Electric Power Test&Research Institute Co. Ltd.Changchun 130102China

Photovoltaic(PV)and battery energy storage systems(BESSs)are key components in the energy market and crucial contributors to carbon emission reduction *** systems can not only provide energy but can also generate considerable revenue by providing frequency regulation services and participating in carbon *** study proposes a bidding strategy for PV and BESSs operating in joint energy and frequency regulation markets,with a specific focus on carbon reduction benefits.A two-stage bidding framework that optimizes the profit of PV and BESSs is *** the first stage,the day-ahead energy market takes into account potential real-time forecast *** the second stage,the real-time balancing market uses a rolling optimization method to account for multiple ***,a real-time frequency regulation control method is proposed for the participation of PV and BESSs in automatic generation control(AGC).This is particularly relevant given the uncertainty of grid frequency fluctuations in the optimization model of the real-time balancing *** control method dynamically assigns the frequency regulation amount undertaken by the PV and BESSs according to the control interval in which the area control error(ACE)*** case study results demonstrate that the proposed bidding strategy not only enables the PV and BESSs to effectively participate in the grid frequency regulation response but also yields considerable carbon emission reduction benefits and effectively improves the system operation economy.

关键词： Photovoltaic(PV) battery energy storage system(BESS) energy market carbon market frequency regulation service bidding strategy

螺旋采集改善SPECT定量准确性及图像质量:体模研究

在线全文

学校读者我要写书评

暂无评论

中国医学影像技术 2024年第3期40卷 446-450页

作者：宋国庆马成皓杨双臣杨鑫张新超田丛娜胡玉敬秦亚楠魏强边艳珠河北省人民医院核医学科河北石家庄050051 河北省脑网络与认知障碍疾病重点实验室河北石家庄050051 石家庄市人民医院影像科河北石家庄050011

目的观察螺旋采集用于改善SPECT定量准确性及图像质量的价值。方法针对1个包含6个球体(直径分别为37、28、22、17、13和10 mm)的体模模型,分别向球体及体模腔内灌注640 kBq/ml及20 kBq/ml^(99)Tc^(m)O_(4)^(-)溶液,并以5、10及15秒/帧... 详细信息

目的观察螺旋采集用于改善SPECT定量准确性及图像质量的价值。方法针对1个包含6个球体(直径分别为37、28、22、17、13和10 mm)的体模模型,分别向球体及体模腔内灌注640 kBq/ml及20 kBq/ml^(99)Tc^(m)O_(4)^(-)溶液,并以5、10及15秒/帧行螺旋采集与常规步进采集;比较2种采集方式所获图像质量主观评分及客观参数,包括本底变异系数(CV)、对比度噪声比(CNR)、平均放射性计数(C_(sphere))和测量定量误差百分比(Error%)的差异。结果各采集时间下,螺旋采集图像质量评分均高于常规步进采集,以5秒/帧时二者差值最大;螺旋采集的CV、CNR、C_(sphere)均优于常规步进采集(P均0.05)。结论相同采集时间、尤其较短采集时间下,以螺旋采集所获SPECT的定量准确性及图像质量优于常规步进采集。

关键词：体层摄影术,发射型计算机,单光子体模,显像术定量图像质量

Chemical vapor deposition for perovskite solar cells and modules

在线全文

学校读者我要写书评

暂无评论

Journal of Semiconductors 2024年第4期45卷 1-4页

作者： Zhihao Tao Yuxuan song Baochang Wang guoqing Tong Liming Ding School of Materials Science and Engineering Hefei University of TechnologyHefei 230009China Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China

Metal halide perovskites are promising materials for solar cells because of high power conversion efficiency(PCE),tun-able bandgap,high defect tolerance,long carrier diffusion length,and low-cost fabrication[1-7].The PCE for perovskite solar cells(PSCs)reaches 26.14%for single-junction cells,29.1%for perovskite/perovskite tandem cells and 33.9%for perovskite/silicon tandem cells,being comparable to that for silicon and other thin-film solar cells[8-10].Perovskite solar cells have been made by solution methods including spin-coat-ing,blade coating and printing[11,12].

关键词： perovskite blade film

Efficient Micropropagation of Chestnut Hybrids(Castanea spp.)Using Modified Woody Plant Medium and Zeatin Riboside

在线全文

学校读者我要写书评

暂无评论

Horticultural Plant Journal 2021年第2期7卷 174-180页

作者： guoqing song Qiuxia Chen Pete Callow Mario Mandujano Xiaoyan Han Beatriz Cuenca Gregory Bonito Carmen Medina-Mora Dennis Wayne Fulbright Daniel EGuyer Plant Biotechnology Resource and Outreach Center Department of HorticultureMichigan State UniversityEast LansingMI 48824United States Department of Plant Soil and Microbial SciencesMichigan State UniversityEast LansingMI 48824United States Beijing Botanical Garden Institute of BotanyChinese Academy of SciencesBeijing 100093China TRAGSA Vivero de OurenseCtra.Maceda-Valdrey km 232700 MacedaOurenseSpain Department of Biosystems&Agricultural Engineering Michigan State UniversityEast LansingMI 48824United States

The chestnuts genus(Castanea spp.)is comprised of economically important trees native to the Northern hemisphere that are used as food and hardwood ***,a very efficient method for micropropagation of European×Japanese chestnut hybrids(Castanea sativa×***)is *** Plant Medium was used as the basal *** vitro shoots of four rootstock cultivars were micropropagated without shoot-tip necrosis on multiplication medium containing 5.7 or 11.4μmol·L^(−1)zeatin riboside,and were rooted on rooting medium containing 2.46μmol·L^(−1)indolebutyric *** shootmultiplication rates for each cultivarwere 2–5 *** vitro rooting percentages for four cultivars were 87%for‘Maraval’,67%for‘Marigoule’,93%for‘Marsol’,and 97%for‘Précoce Migoule’.Within a 5 week period,80%–95%of rooted shoots were successfully acclimated under high humidity conditions after they were planted in either soil or rockwool.

关键词： Castanea spp. micropropagation shoot multiplication rooting tissue culture zeatin riboside acclimation

Combination of High Yield Strength and Improved Ductility of 21Cr Lean Duplex Stainless Steel by Tailoring Cold Deformation and Low-Temperature Short-Term Aging

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2024年第4期37卷 695-702页

作者： Zhenghong Liu Zhigang Wu Ying Han Xiaolei song guoqing Zu Weiwei Zhu Xu Ran Key Laboratory of Advanced Structural Materials Ministry of EducationChangchun University of TechnologyChangchun130012China School of Materials Science and Engineering Changchun University of TechnologyChangchun130012China Jilin Province Key Laboratory of Advanced Materials Processing and Application for Rail Transit Changchun University of TechnologyChangchun130012China

Proper matching of cold-rolled deformation and low-temperature short-term aging can simultaneously enhance the strength and ductility of the lean duplex stainless steel. To investigate this, the microstructure evolution of cold-rolled and aging steels was observed by using scanning electron microscopy, transmission electron microscopy and electron backscattered diffraction. Additionally, the phase volume fraction was measured using X-ray diffraction. In this study, it was observed that the elongation of 21Cr lean duplex stainless steel significantly increased to 16.7% after undergoing moderate cold deformation (~ 40% reduction) and subsequent aging treatment at 550 ℃ for 30 min. Remarkably, the material still maintained a high yield strength of 1045 MPa. Such an excellent mechanical property was attributed to a unique microstructure combination of fine α'-martensite, twins, coarsened austenite resulting from partial martensite reverse transformation, and two-phase fine layered structure. The result of this study may open up new horizons for the alloy development in order to overcome the low ductility of cold-rolled high-strength lean duplex stainless steel.

关键词： Lean duplex stainless steel Cold rolling Aging Microstructure Mechanical properties Use our pre-submission checklist