检索结果-南通市图书馆

Detection of green apples in natural scenes based on saliency theory and Gaussian curve fitting

在线全文

学校读者我要写书评

暂无评论

International Journal of Agricultural and Biological Engineering 2018年第1期11卷 192-198页

作者： bairong li Yan Long Huaibo Song College of Mechanical and Electronic Engineering Northwest A&F UniversityYangling 712100ShaanxiChina Key Laboratory of Agricultural Internet of Things Ministry of AgricultureYangling 712100ShaanxiChina Key Laboratory of Agricultural Information Perception and Intelligent Services Yangling 712100ShaanxiChina

Green apple targets are difficult to identify for having similar color with backgrounds such as *** primary goal of this study was to detect green apples in natural scenes by applying saliency detection and Gaussian curve fitting ***,the image was represented as a close-loop graph with superpixels as *** nodes were ranked based on the similarity to background and foreground queries to generate the final saliency ***,Gaussian curve fitting was carried out to fit the V-component in YUV color space in salient areas,and a threshold was selected to binarize the *** verify the validity of the proposed algorithm,55 images were selected and compared with the common used image segmentation algorithms such as k-means clustering algorithm and FCM(Fuzzy C-means clustering algorithm).Four parameters including recognition ratio,FPR(false positive rate),FNR(false negative rate)and FDR(false detection rate)were used to evaluate the results,which were 91.84%,1.36%,8.16%and 4.22%,*** results indicated that it was effective and feasible to apply this method to the detection of green apples in nature scenes.

关键词： image processing green apple natural scene machine vision object detection saliency theory Gaussian curve fitting

In situ TEM revealing the effects of dislocations on lithium-ion migration in transition metal dichalcogenides

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

Journal of Energy Chemistry 2021年第7期30卷 280-284页

作者： Ruiwen Shao Chengkai Yang Chen Yang Shulin Chen Weikang Dong bairong li Xiumei Ma Jing Lu lixin Dong Peng Gao Dapeng Yu Beijing Advanced Innovation Center for Intelligent Robots and Systems and Institute of Convergence in Medicine and Engineering Beijing Institute of TechnologyBeijing 100081China Electron Microscopy Laboratory School of PhysicsPeking UniversityBeijing 100871China College of Materials Science and Engineering Fuzhou UniversityFuzhou 350108FujianChina State Key Laboratory for Artiﬁcial Microstructure&Mesoscopic Physics School of PhysicsPeking UniversityBeijing 100871China Analysis and Testing Center Beijing Institute of TechnologyBeijing 100081China Collaborative Innovation Center of Quantum Matter Beijing 100871China Department of Biomedical Engineering City University of Hong KongHong KongChina International Center for Quantum Materials School of PhysicsPeking UniversityBeijing 100871China Department of Physics South University of Science and Technology of ChinaShenzhen 518055GuangdongChina

The two-dimensional (2D) structure of layered transition metal dichalcogenides (TMDs) provides unusual physical properties [1,2]and chemical reactivity [3,4], which can be influenced by defects such as dislocations [5,6]. For example, dislocations can act as nucleation sites for the onset of deformation when subjected to stress [7].

关键词： Batteries Defect Structure–property relationships Electrodes Transition metal dichalcogenides

Performance enhancement and active sites identification of Cu-Cd bimetallic oxide derived catalysts for electrochemical CO_(2) reduction

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第4期91卷 50-58页

作者： Cai Wang Xin Hu bairong Chen Houan Ren Xiaoyu Wang Yilin Zhang Xinyu Chen Yuping liu Qingxin Guan Wei li State Key Laboratory of Elemento-Organic Chemistry Key Laboratory of Adv.Energy Mater.Chemistry(Ministry of Education)College of ChemistryNankai UniversityTianjin 300071China

The development of earth-abundant electrocatalysts with high performance for electrochemical CO_(2)reduction(ECR)is of great ***-based catalysts have been widely investigated for ECR due to their unique ability to generate various carbonaceous products,but directing selectivity toward one certain product and identifying the real active sites during ECR are still full of ***,after the incorporation of CdO into CuO,the Cu_(0.5)Cd_(0.5)-O catalyst achieves a 10.3-fold enhancement for CO selectivity in comparison with CuO,and a CO faradic efficiency nearly 90%with a current density around20 mA cm^(-2)could maintain at least 60 ***,a wide CO/H_(2)ratio(0.07-10)is reached on Cu_(x)Cd_(1-x)-O catalysts by varying the Cu/Cd ratio,demonstrating the potential of syngas production using such *** results of ex situ XRD,XPS,and in situ Raman reveal that the real active sites of Cu_(0.5)Cd_(0.5)-O catalysts for CO production during ECR reaction are the reconstructed mixed phases of CuCd alloy and CdCO_(3).In situ FTIR and theoretical calculations further implicate the presence of Cd related species promotes the CO desorption and inhibits the H_(2)evolution,thus leading to an enhanced CO generation.

关键词： CO_(2)reduction Cu-Cd bimetallic Real active sites CO production

内镜下纵行切开联合曲安奈德注射治疗化学烧伤性食管狭窄的特征分析及效果评价

在线全文

学校读者我要写书评

暂无评论

空军军医大学学报 2024年第3期45卷 292-297页

作者：陈虹羽徐梦楠张静郭瑞陈晓李曼华张小朋银新李白容孙涛范崇熙宁守斌安徽医科大学空军临床学院消化内科空军特色医学中心消化内科北京100142

目的探讨内镜下纵行切开联合曲安奈德注射治疗化学烧伤性食管狭窄的疗效及可行性。方法选取2019年2月至2023年2月在空军特色医学中心接受内镜下纵行切开联合曲安奈德注射治疗的15例化学烧伤性食管狭窄患者的临床资料进行回顾性观察。结... 详细信息

目的探讨内镜下纵行切开联合曲安奈德注射治疗化学烧伤性食管狭窄的疗效及可行性。方法选取2019年2月至2023年2月在空军特色医学中心接受内镜下纵行切开联合曲安奈德注射治疗的15例化学烧伤性食管狭窄患者的临床资料进行回顾性观察。结果15例患者共接受内镜治疗59次,平均手术用时(31.73±11.36)min,切开狭窄长度(7.53±4.88)cm,治疗过程中有6例合并支架置入,末次治疗结束8周后吞咽困难情况及BMI明显改善,总有效率80%,且末次治疗后6个月60%(9/15)患者Stooler分级为0~1级。59次治疗过程中有3次出现肌层损伤或微小穿孔,均给予术中钛夹封闭,无其他内镜治疗相关严重并发症。结论内镜下纵行切开联合曲安奈德注射治疗化学烧伤性食管狭窄的短期内安全、有效,但其长期疗效仍有待随访观察。

关键词：化学烧伤性食管狭窄内镜下纵行切开曲安奈德注射 Stooler分级疗效评价

A novel deep generative model for mRNA vaccine development: Designing 5′ UTRs with N1-methyl-pseudouridine modification

在线全文

学校读者我要写书评

暂无评论

Acta Pharmaceutica Sinica B 2024年第4期14卷 1814-1826页

作者： Xiaoshan Tang Miaozhe Huo Yuting Chen Hai Huang Shugang Qin Jiaqi Luo Zeyi Qin Xin Jiang Yongmei liu Xing Duan Ruohan Wang lingxi Chen Hao li Na Fan Zhongshan He Xi He bairong Shen Shuai Cheng li Xiangrong Song Institute of Systems Genetics Department of Critical Care MedicineFrontiers Science Center for Disease-related Molecular NetworkState Key Laboratory of Biotherapy and Cancer CenterWest China HospitalSichuan UniversityChengdu 610000China Department of Computer Science City University of Hong KongHong Kong 99907China Department of Biology Brandeis UniversityBostonMA 02453USA

Efficient translation mediated by the 5'untranslated region(5'UTR)is essential for the robust efficacy of mRNA ***,the N1-methyl-pseudouridine(m1)modification of mRNA can impact the translation efficiency of the 5'*** discovered that the optimal 5'UTR for m1y-modified mRNA(m1y-5'UTR)differs significantly from its unmodified counterpart,high-lighting the need for a specialized tool for designing mly-5'UTRs rather than directly utilizing high-expression endogenous gene 5'*** response,we developed a novel machine learning-based tool,Smart5UTR,which employs a deep generative model to identify superior m1y-5'UTRs in *** tailored loss function and network architecture enable Smart5UTR to overcome limitations inherent in existing *** a result,Smart5UTR can successfully design superior 5'UTRs,greatly benefiting mRNA vaccine ***,Smart5UTR-designed superior 5'UTRs significantly enhanced antibody titers induced by COVID-19 mRNA vaccines against the Delta and Omicron variants of SARS-CoV-2,surpassing the performance of vaccines using high-expression endogenous gene 5'UTRs.

关键词： mRNA vaccine Machine learning 5'UTR mRNA design Sequence design N1-Methyl-pseudouridine COVID-19 SARS-CoV-2

THE TWO TYPES OF FLARES IN THE ACTIVE REGION AR5395

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

天文研究与技术 1990年第4期 34-37,328页

作者： Zhang bairong, Luan Di, li QiongyingYunnan Observatory, Chinese Academy of Sciences Kunming, Yunnan Province, 650011, China

1 Introduction In the 1970s, it had been known that two kinds of flares may be existed. One isthe "Compact flare", in EUV and X-ray, it is appeared as static brightenning coronalloop arches preexisted in lower level. Another kind of flare is the "two-ribbon flare", it isinitiated from the collapse of filament and characterized by the continued increasing

关键词： ribbon filament collapse Solar continued explain bright appeared listed magnet

中小城市对高层公寓的需求——以银川市紫微星座为例

在线全文

学校读者我要写书评

暂无评论

小城镇建设 2007年第6期25卷 70-72页

作者：李柏荣宁夏银帝房地产开发有限公司

公寓作为城市化发展的产物，最早出现在欧美。国内的公寓于上世纪末开始在北京、广州、上海等大城市快速发展。相对于传统住宅，公寓以其完善的服务配套、时尚的建筑风格、充满活力的居住模式、紧凑精巧的户型设计、相对低廉的房屋总价... 详细信息

公寓作为城市化发展的产物，最早出现在欧美。国内的公寓于上世纪末开始在北京、广州、上海等大城市快速发展。相对于传统住宅，公寓以其完善的服务配套、时尚的建筑风格、充满活力的居住模式、紧凑精巧的户型设计、相对低廉的房屋总价而深受都市年轻人和创业者的追捧，在住宅市场中独树一帜。但在中小城市中，由于土地资源的相对富裕和人口密度相对较小以及人均收入等种种因素的制约，

关键词：高层公寓中小城市银川市星座城市化发展传统住宅服务配套建筑风格

α-酮戊二酸对小鼠胆汁淤积性肝损伤的缓解作用

在线全文

学校读者我要写书评

暂无评论

陆军军医大学学报 2022年第13期44卷 1322-1329页

作者：谢雨虹唐波范崇熙李白容孙涛宁守斌安徽医科大学空军临床学院合肥230032 空军特色医学中心消化内科北京100142 陆军军医大学(第三军医大学)第二附属医院消化内科重庆400037

目的探讨α-酮戊二酸(alpha-ketoglutarate,AKG)对小鼠胆管结扎(bile duct ligation,BDL)所致胆汁淤积性肝损伤的缓解作用及其机制。方法32只C57BL/6雄性小鼠按随机数字表法分为4组(每组8只):假手术(Sham)组、假手术+AKG(Sham+AKG)组、... 详细信息

目的探讨α-酮戊二酸(alpha-ketoglutarate,AKG)对小鼠胆管结扎(bile duct ligation,BDL)所致胆汁淤积性肝损伤的缓解作用及其机制。方法32只C57BL/6雄性小鼠按随机数字表法分为4组(每组8只):假手术(Sham)组、假手术+AKG(Sham+AKG)组、胆管结扎(BDL)组、胆管结扎+AKG(BDL+AKG)组,所有小鼠均于术后7 d取材。检测血清ALT、AST、TBIL、TBA、ALP水平,HE染色评估各组肝组织损伤程度,免疫组化检测肝组织F4/80、MPO的表达水平,qRT-PCR检测肝组织促炎细胞因子mRNA表达水平,TUNEL染色观察肝细胞凋亡。结果与BDL组相比,BDL+AKG组小鼠血清ALT、AST、TBIL、TBA、ALP水平均明显降低(P<0.05),肝组织损伤程度明显减轻(P<0.05),F4/80、MPO表达减少(P<0.05),肝组织促炎细胞因子mRNA表达明显减少(P<0.05),TUNEL阳性肝细胞数目明显减少(P<0.05)。结论α-酮戊二酸对小鼠胆管结扎所致胆汁淤积性肝损伤具有缓解作用,其机制可能与其抑制炎症反应和减少肝细胞凋亡有关。

关键词： α-酮戊二酸胆汁淤积性肝损伤炎症反应细胞凋亡小鼠

在线全文

学校读者我要写书评

暂无评论

化学实验探究教学中情境创设的有效策略

科教导刊 2018年第15期 134-135页

作者：李柏荣徐飞玲广东省台山市第一中学广东台山529200

创设探究情境是提高学生的实验探究能力和科学素养的首要环节,结合具体案例,讨论化学实验探究教学中情境创设的有效策略:挖掘新闻热点素材、依托日常生活经验、引用化学实验史实、激化思维认知冲突、开发相关趣味实验。

关键词：化学实验探究情境创设策略