检索结果-南通市图书馆

Chinese Physics B 2024年第5期33卷 117-123页

作者：吴思远朱天念涂思佳肖睿娟袁洁吴泉生李泓翁红明 Institute of Physics Chinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China College of Materials Science and Optoelectronic Technology University of Chinese Academy of SciencesBeijing 100049China Condensed Matter Physics Data Center of Chinese Academy of Sciences Beijing 100190China

The exponential growth of literature is constraining researchers’access to comprehensive information in related fields.While natural language processing(NLP)may offer an effective solution to literature classification,it remains hindered by the lack of labelled dataset.In this article,we introduce a novel method for generating literature classification models through semi-supervised learning,which can generate labelled dataset iteratively with limited human input.We apply this method to train NLP models for classifying literatures related to several research directions,i.e.,battery,superconductor,topological material,and artificial intelligence(AI)in materials science.The trained NLP‘battery’model applied on a larger dataset different from the training and testing dataset can achieve F1 score of 0.738,which indicates the accuracy and reliability of this scheme.Furthermore,our approach demonstrates that even with insufficient data,the not-well-trained model in the first few cycles can identify the relationships among different research fields and facilitate the discovery and understanding of interdisciplinary directions.

关键词： natural language processing text mining materials science

数字经济驱动黄河流域高质量发展路径研究——基于TOE框架的动态QCA分析

在线全文

学校读者我要写书评

暂无评论

经济体制改革 2024年第2期 25-32页

作者：张远记韩存烟台理工学院经济管理学院(黄河流域美丽乡村振兴协同创新中心) 山东烟台264003 山东工商学院会计学院山东烟台264005

以黄河流域9省份为研究样本,运用TOE理论框架和动态汇总型fsQCA方法,采用2011~2020年省际数据,探究数字基础设施、数字技术应用、数字组织创新、数字组织能力、政府数字政策、区域数字金融6个前因条件对黄河流域高质量发展的协同效应。... 详细信息

以黄河流域9省份为研究样本,运用TOE理论框架和动态汇总型fsQCA方法,采用2011~2020年省际数据,探究数字基础设施、数字技术应用、数字组织创新、数字组织能力、政府数字政策、区域数字金融6个前因条件对黄河流域高质量发展的协同效应。研究发现:数字经济技术、数字经济组织、数字经济环境框架下的6个条件均不是区域高/非高质量发展的必要条件;识别出驱动黄河流域高质量发展的“政策-创新型”“组织-环境型”两种组态;黄河流域高质量发展驱动路径存在多重轨迹演化现象,政策-创新型是转折轨迹,组织-环境型则属于混合轨迹。据此,黄河流域9省份可结合区域数字资源禀赋,分阶段制定差异化的区域高质量发展策略。同时,应高度重视数字创新效能,推动新业态、新模式、新服务不断涌现,促进区域创新发展。

关键词：数字经济黄河流域高质量发展动态QCA TOE框架

基于贝叶斯卷积神经网络的渗透系数反演与不确定性分析

在线全文

学校读者我要写书评

暂无评论

中国农村水利水电 2024年第4期 50-57,66页

作者：季俣哲查元源武汉大学水资源工程与调度全国重点实验室湖北武汉430072

地下水资源的科学管理及决策高度依赖于精确的地下水模型,其中渗透系数这一水文地质参数发挥着至关重要的作用。为了全面理解和有效利用地下水,不仅需要准确估计渗透系数空间分布,还需对参数的不确定性进行量化,以评价其可信度。研究利... 详细信息

地下水资源的科学管理及决策高度依赖于精确的地下水模型,其中渗透系数这一水文地质参数发挥着至关重要的作用。为了全面理解和有效利用地下水,不仅需要准确估计渗透系数空间分布,还需对参数的不确定性进行量化,以评价其可信度。研究利用贝叶斯卷积神经网络(BCNN)探讨了渗透系数的参数反演和不确定性分析问题。为了检验该方法的有效性,进行了二维稳态水力层析抽水试验的虚拟数值实验。基准模型是具有编码-解码器结构的卷积神经网络,通过建立一个逆向映射模型,能够直接从空间插值得到的水头场中估计出参数场。在这个确定性模型的基础上,训练了贝叶斯卷积神经网络。结果表明,BCNN在不同训练数据规模下,都比确定性模型精度更高,特别是在数据量较少时,优势更加突出。通过对测试集样本进行分析,发现模型对不同区域的估计值有不同的可信度。训练良好的BCNN能够可靠地捕捉渗透系数分布的大致模式。此外,与生成式模型相比,BCNN在估计更加具挑战性的多峰非高斯对数渗透系数场时也有良好表现,这证明了BCNN在不同地质介质条件下的广泛适用性。贝叶斯卷积神经网络的使用能准确反演渗透系数并评估不确定性,为后续的地下水流模拟等物理过程提供了坚实的基础。

关键词：渗透系数参数反演不确定分析贝叶斯卷积神经网络

维普期刊数据库博看期刊

省际视角下社区医疗资源及其利用对中国老年人临终地点的影响——基于CLHLS死亡样本的实证分析

在线全文

学校读者我要写书评

暂无评论

南方人口 2024年第1期39卷 33-45页

作者：涂丽袁妙彧湖北经济学院财政与公共管理学院湖北武汉430205

不同于西方的纵向阶段式发展,中国医疗资源发展的省际空间差异造就了我国水平式结构性临终地点分布特征。基于此,本研究运用中国老年健康影响因素跟踪调查(CLHLS)死亡样本的微观数据和中国统计年鉴省级层面宏观数据,从省际空间视角分析... 详细信息

不同于西方的纵向阶段式发展,中国医疗资源发展的省际空间差异造就了我国水平式结构性临终地点分布特征。基于此,本研究运用中国老年健康影响因素跟踪调查(CLHLS)死亡样本的微观数据和中国统计年鉴省级层面宏观数据,从省际空间视角分析社区医疗资源及其利用对中国老年人临终地点及其变化的影响。研究发现:省际因素对中国老年人临终地点具13%左右的解释力度;中国城市省级社区医疗卫生资源的有效供给及合理利用对老年人主动回归居家临终具有明显促进作用。这种促进作用体现为资源供给与利用的双重推进;农村地区老年人的居家临终行为则多为医疗资源缺乏下的被动选择,对社区医疗卫生资源的充分利用能在一定程度上推动主动在家临终行为。此外,社区医疗资源及其利用的优化能够通过增加高收入家庭老年人主动临终家庭的概率,降低城市老年人临终地点分布的收入效应,进而置换出部分稀缺的医院医疗资源;而农村地区的社区医疗资源及其利用则有利于弱化失能程度对老年人临终地点的影响,减少农村失能老人的被动居家临终,增加其利用医院医疗资源的可能性。

关键词：临终地点社区医疗资源分层logistic模型

Application of efficient and sustainable freeze-dissolving technology in manufacturing of KHCO_(3)ultrafine particles

在线全文

学校读者我要写书评

暂无评论

Green Chemical Engineering 2024年第2期5卷 266-272页

作者： jiaqi Luo Qifan Su Qiushuo Yu Xinyue Zhai yuan Zou Huaiyu Yang School of Chemical Engineering Chemical Engineering Research Center of the Ministry of Education for Advanced Use Technology of Shanbei EnergyInternational Science&Technology Cooperation Base of MOST for Clean Utilization of Hydrocarbon ResourcesNorthwest UniversityXi’an710069China Department of Chemical Engineering Loughborough UniversityLoughboroughLE113TUUnited Kingdom

The development of ultrafine particles provided a new way to solve problems in the fields of energy,environment,and medicine,and had become one of the most promising technologies.Therefore,the application of ultrafine particles required the development of cleaner,greener,and more efficient preparation methods.The new freeze-dissolving technology has been applied in manufacturing of KHCO_(3)ultrafine particles,with an aqueous solution of 0.02-0.1 g KHCO_(3)/g water.Frozen ice particles were formed after dripping the solution into liquid nitrogen.The antisolvent ethanol was used to dissolve the ice spherical template at a temperature below 273.15 K,and the pre-formed KHCO_(3)ultrafine particles inside the ice template remained in the ethanol aqueous solution.The ice particles were put into the freeze dryer to isolate the ultrafine KHCO_(3)particles.Compared with the particles produced with traditional freeze-drying technology,the ultrafine powder/particles produced by the freeze-dissolving technology were smaller with narrower size distribution.The freeze-dissolving technology has demonstrated a much more sustainable and efficient manufacturing process than the traditional freeze-drying process.In addition,the influence of the concentrations of KHCO_(3)and the sizes of ice particles were investigated with the discussions of mechanisms.

关键词： Freeze-dissolving Freeze-drying Ultrafine particles Sustainable

Chinese Medicine Prolongs Overall Survival of Chinese Patients with Advanced Gastric Cancer: Treatment Pattern and Survival Analysis of a 20-Year Real-World Study

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Integrative Medicine 2024年第6期30卷 489-498页

作者： CAO Ni-da ZHU Xiao-hong MA Fang-qi XU Yan DONG jia-huan QIN Meng-meng LIU Tian-shu ZHU Chun-chao GUO Wei-jian DING Hong-hua GUO yuan-biao LIU Li-kun SONG jin-jie WU ji-ping CHENG Yue-lei ZENG Lin ZHAO Ai-guang Oncology Department I Longhua Hospital Shanghai University of Traditional Chinese MedicineShanghai200032China Oncology Department Zhongshan HospitalFudan UniversityShanghai200032China Gastrointestinal Surgery Department Renji HospitalShanghai Jiaotong University School of MedicineShanghai200127China Oncology Department Fudan University Shanghai Cancer CenterShanghai200032China Oncology Department Shanghai General HospitalShanghai Jiaotong University School of MedicineShanghai200080China Traditional Chinese Medicine Department Ruijin HospitalShanghai Jiaotong University School of MedicineShanghai200025China Oncology Department Shanxi Traditional Chinese Medicine HospitalTaiyuan030012China Oncology Department Xiyuan HospitalChina Academy of Chinese Medical ScienceBeijing102445China Oncology Department Yunnan Province Hospital of Traditional Chinese MedicineKunming650021China Oncology Department Shuguang HospitalShanghai University of Traditional Chinese MedicineShanghai201203China Shanghai NewCore Biotechnology Co. Ltd.Shanghai200240China

Objective To describe the treatment patterns and survival status of advanced gastric cancer(AGC)in China in the past two decades,and objectively evaluate the impact of standardized Chinese medicine(CM)treatment on the survival of AGC patients.Methods This multicenter registry designed and propensity score analysis study described the diagnosis characteristics,treatment-pattern development and survival status of AGC from 10 hospitals in China between January 1,2000 and July 31,2021.Overall survival(OS)was evaluated between non-CM cohort(standard medical treatment)and CM cohort(integrated standard CM treatment≥3 months).Propensity score matching(PSM)and inverse probability of treatment weighting(IPTW)were performed to adjust any difference in average outcomes for bias.Results A total of 2,001 patients histologically confirmed locally advanced and/or metastasis stomach and gastroesophageal junction adenocarcinoma were enrolled.Among them,1,607 received systemic chemotherapy,215(10.74%)accepted molecular targeted therapy,44(2.2%)received checkpoint inhibitor therapy,and 769(38.43%)received CM.Two-drug regimen was the main choice for first-line treatment,with fluoropyrimidine plus platinum as the most common regimen(530 cases,60.09%).While 45.71%(16 cases)of patients with HER2 amplification received trastuzumab in first-line.The application of apatinib increased(33.33%)in third-line.The application of checkpoint inhibitors has increased since 2020.COX analysis showed that Lauren mixed type(P=0.017),cycles of first-line treatment>6(P=0.000),CM(P=0.000),palliative gastrectomy(P=0.000),trastuzumab(P=0.011),and apatinib(P=0.008)were independent prognostic factors for the OS of AGC.After PSM and IPTW,the median OS of CM cohort and non-CM cohort was 18.17 and 12.45 months,respectively(P<0.001).Conclusions In real-world practice for AGC in China,therapy choices consisted with guidelines.Two-drug regimen was the main first-line choice.Standardized CM treatment was an independent prognostic factor and could prolong the OS of C

关键词： advancedgastriccancer real-world study treatment pattern survival analysis Chinese medicine

利用建筑虚拟储能提升风电消纳能力的电热联合系统优化调度方法

在线全文

学校读者我要写书评

暂无评论

太阳能学报 2024年第5期45卷 206-216页

作者：侯俊禹袁至王维庆李骥新疆大学可再生能源发电与并网控制教育部工程研究中心乌鲁木齐830017 国网新疆电力有限公司电力科学研究院乌鲁木齐830011

利用建筑虚拟储能能提升电热联合系统的风电消纳能力,但若只考虑建筑结构储能而不考虑室内空气储能会导致虚拟储能利用不足。针对此问题,在奖惩阶梯碳交易背景下提出一种利用建筑虚拟储能提升风电消纳能力的电热联合系统优化调度方法。... 详细信息

利用建筑虚拟储能能提升电热联合系统的风电消纳能力,但若只考虑建筑结构储能而不考虑室内空气储能会导致虚拟储能利用不足。针对此问题,在奖惩阶梯碳交易背景下提出一种利用建筑虚拟储能提升风电消纳能力的电热联合系统优化调度方法。首先,以室内空气和建筑结构热平衡模型为基础建立精细化建筑虚拟储能模型;其次,在系统中引入奖惩阶梯碳交易机制及需求响应机制;再次,考虑电、热功率平衡以及室内温度等约束,以电热联合系统总成本最低为目标函数,并提出改进型平衡器优化算法对目标函数进行优化求解;最后,对不同场景下电热联合系统对风电的消纳、CO_(2)排放及经济性进行分析,结果表明:所提方法不仅提高了电热联合系统的风电消纳率,降低了CO_(2)的排放量,且提升了经济性。

关键词：风电消纳建筑虚拟储能平衡优化器算法奖惩阶梯碳交易综合需求响应

维普期刊数据库博看期刊

增强优势地区高质量发展土地保障能力的制度保障

在线全文

学校读者我要写书评

暂无评论

河北学刊 2024年第4期44卷 141-149页

作者：蔡继明熊柴刘媛清华大学社会科学学院清华大学政治经济学研究中心中国政法大学商学院首都经济贸易大学

如何通过深化土地管理制度改革增强土地要素在优势地区高质量发展中的保障能力,是关系到中国式现代化能否顺利实现的重大现实命题。现行土地管理制度对优势地区高质量发展存在着“计划性”土地供给约束,一方面不利于城市化优势地区有效... 详细信息

如何通过深化土地管理制度改革增强土地要素在优势地区高质量发展中的保障能力,是关系到中国式现代化能否顺利实现的重大现实命题。现行土地管理制度对优势地区高质量发展存在着“计划性”土地供给约束,一方面不利于城市化优势地区有效发挥集聚效应,另一方面抑制了农业转移人口市民化进程和农村户均土地经营规模的扩大,限制了农业劳动生产率的提高和农业现代化进程的发展。因此,本文提出以下建议:第一,在取消对特大超大城市人口总量限制的同时,增加城市化优势地区“计划性”土地供给;第二,扩大宅基地流转和城乡建设用地增减挂钩范围,增加城市化优势地区“市场化”土地供给。通过以上土地管理制度的改革,一方面可以为提高城市化优势地区高质量发展和城市化水平提供土地保障能力;另一方面可以加快农业转移人口市民化进程,扩大农村户均土地经营规模,增强农业优势地区的土地保障能力。

关键词：优势地区高质量发展土地管理制度土地保障能力

基于PLUS-InVEST模型的酒泉市生态系统碳储量时空演变与预测

在线全文

学校读者我要写书评

暂无评论

环境科学 2024年第1期45卷 300-313页

作者：石晶石培基王梓洋程番苑西北师范大学地理与环境科学学院兰州730070 甘肃省土地利用与综合整治工程研究中心兰州730070

基于“双碳”战略背景探讨西北干旱区土地利用变化对碳储量的影响及碳储量空间分异驱动因素,对提高区域生态系统碳汇增量和促进区域碳收支平衡具有重要意义.中国西北干旱区为自然生态极端脆弱区,随着新型城镇化快速推进,土地利用变化速... 详细信息

基于“双碳”战略背景探讨西北干旱区土地利用变化对碳储量的影响及碳储量空间分异驱动因素,对提高区域生态系统碳汇增量和促进区域碳收支平衡具有重要意义.中国西北干旱区为自然生态极端脆弱区,随着新型城镇化快速推进,土地利用变化速率明显加快并对生态系统碳储量及固持能力产生一定影响.运用PLUS-InVEST模型模拟了酒泉市2035年自然发展、集约发展、水资源约束和生态保护情景下碳储量的时空演变特征,并采用参数最优地理探测器模型分析了碳储量空间分异驱动力.结果表明:①1990~2020年酒泉市耕地、水域和建设用地面积呈显著增加趋势,其余土地利用类型面积呈减小趋势.②1990~2020年酒泉市碳储量从7722808.1 t增至7784371 t,草地转换成未利用地是造成区域碳储量损失的主要原因,占损失总量的85%.③2035年4种发展情景的碳储量均为增加趋势,其中生态保护情景增幅最为显著,增量为76989.29 t.④土地利用程度、人口密度、GDP密度和NDVI是酒泉市碳储量空间分异的主要驱动因子,其中土地利用程度解释力最强(q值为0.849),自然与人为因子的交互作用增强了各因子对碳储量空间分异的解释力.研究结果可为酒泉市生态系统综合管理及国土空间优化提供科学基础和决策依据.

关键词：碳储量 InVEST模型 PLUS模型参数最优地理探测器酒泉市

Molecular docking-aided AIEgen design: concept, synthesis and applications

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第8期 2614-2628页

作者： jian-Qing Zhang Xiao-Yu Xu Fu-Sheng Liu Shu-Qiang Cao Yu-Xin Gui Yi-Wen Su Xiao-Yu He ji-yuan Liang You-Quan Zou Department of Radiation and Medical Oncology Zhongnan Hospital of Wuhan University School of Pharmaceutical Sciences Wuhan University Key Laboratory of Combinatorial Biosynthesis and Drug Discovery Ministry of Education Wuhan University Tai Kang Center for Life and Medical Sciences Wuhan University Department of Hepatobiliary & Pancreatic Surgery Zhongnan Hospital of Wuhan University

Aggregate-induced emission luminogens（AIEgens） have been widely used in biological imaging, chemical sensing, and disease treatments. The rational design and construction of AIEgens have received considerable research interests during the last few years. Herein, molecular docking-aided AIEgen design has been reasonably proposed and AIEgen TBQZY with excellent1O2generation ability has been synthesized. The newly developed TBQZY could efficiently kill S. epidermidis and methicillinresistant S. epidermidis（MRSE） by tightly binding to bacteria and triggering the accumulation of1O2in bacteria. TBQZY specifically regulated the immune system and polarized macrophages from M1 to M2 to accelerate the elimination of biofilm in vivo. In addition, healing acceleration was observed in chronic wounds treated with TBQZY, and side effects were negligible.Meanwhile, TBQZY had extraordinary potential for combating drug-resistant bacteria in the clinical setting. This research not only provided new concepts for the design of AIEgens, but also shed some lights on the discovery of drugs against drug-resistant bacteria.

关键词：