检索结果-南通市图书馆

基于“时间-空间-关系”三个维度的美丽城市建设研究

在线全文

学校读者我要写书评

暂无评论

生态经济 2025年第1期41卷 19-27页

作者：包存宽申沐曦李红丽复旦大学环境科学与工程系上海200438 复旦大学大气与海洋科学系上海200438

论文探讨了人与自然和谐共生美丽城市的时代内涵,即美丽城市是坚持以人民为中心的发展思想,兼具客观性与主观性,呈现绿色低碳、环境优美、生态宜居、安全健康、智慧高效等时代特征的,并从景观生态学及“存在的三元辩证”,构建了“时间... 详细信息

论文探讨了人与自然和谐共生美丽城市的时代内涵,即美丽城市是坚持以人民为中心的发展思想,兼具客观性与主观性,呈现绿色低碳、环境优美、生态宜居、安全健康、智慧高效等时代特征的,并从景观生态学及“存在的三元辩证”,构建了“时间—空间—关系”的三维分析框架,阐述了美丽城市建设的“全领域转型”“全方位提升”“全地域建设”以及“全社会行动”四大关键任务,最后提出了美丽城市建设的政策建议。

关键词：美丽中国美丽城市城市治理城市更新

Movement behavior and separation of Al_(2)O_(3)from Al melt under rotating magnetic field

在线全文

学校读者我要写书评

暂无评论

China Foundry 2024年第6期21卷 625-633页

作者： Shan-hao Du Yu-ting shen Yu-bo Zhang Shao-jun Yu De-hua liu Ting-ju li Key Laboratory of Solidification Control and Digital Preparation Technology(liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024LiaoningChina Ningbo Institute of Dalian University of Technology Ningbo 315016ZhejiangChina School of Mechanics Dalian University of TechnologyDalian 116024LiaoningChina

The effect of a rotating magnetic field(RMF)on the distribution of Al_(2)O_(3)particles with an Al melt was studied by means of simulation and *** results show that Al_(2)O_(3)particles(diameter of 1-10μm,1wt.%)are significantly agglomerated at the top of ingots when subjected to an RMF,and their distribution is influenced by both the intensity and the duration of RMF *** optimal separation efficiency is achieved with the magnetic intensity of 12 mT for 120 *** number of the particles at the bottom and the middle decreases by 64.5%and 69.7%,respectively,while that at the top increases by 242.5%compared to the condition without an ***,if further increase the intensity or the duration of RMF,it can induce turbulent flows that draw some of the separated Al_(2)O_(3)particles back into the melt,reducing separation *** calculation results show that as the magnetic intensity increases from 6 mT to 18 mT,the velocity difference between the particles and the Al melt flow quadruples,increasing from 0.013 m·s^(-1)to 0.066 m·s^(-1).Driven by this velocity difference,centrifugal motion,and secondary circulation,Al_(2)O_(3)particles tend to migrate upwards within the melt,facilitating the separation of impurity particles and enhancing the purity of the melt.

关键词： Al_(2)O_(3)particles rotating magnetic field numerical simulation electromagnetic purification

Consistent comparison of angle Kappa adjustment between Oculyzer and Topolyzer Vario topography guided LASIK for myopia by EX500 excimer laser

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2018年第4期11卷 662-667页

作者： Ming-shen Sun li Zhang Ning Guo Yan-Zheng Song Feng-ju Zhang Beijing Tongren Eye Center Beijing Tongren Hospital Capital Medical University Beijing Ophthalmology & Visual Sciences Key Lab

AIM： To evaluate and compare the uniformity of angle Kappa adjustment between Oculyzer and Topolyzer Vario topography guided ablation of laser in situ keratomileusis（LASIK） by EX500 excimer laser for ***： Totally 145 cases（290 consecutive eyes）with myopia received LASIK with a target of emmetropia. The ablation for 86 cases（172 eyes） was guided manually based on Oculyzer topography（study group）, while the ablation for 59 cases（118 eyes） was guided automatically by Topolyzer Vario topography（control group）. Measurement of adjustment values included data respectively in horizontal and vertical direction of cornea. RESULTS： Horizontally, synclastic adjustment between manually actual values（dx_（manu）） and Oculyzer topography guided data（dx_（ocu）） accounts 35.5% in study group, with mean dx_（manu）/dx_（ocu） of 0.78±0.48; while in control group, synclastic adjustment between automatically actual values（dx_（auto）） and Oculyzer topography data（dx_（ocu）） accounts 54.2%, with mean dx_（auto）/dx_（ocu） of 0.79±0.66. Vertically, synclastic adjustment between dy_（manu） and dy_（ocu） accounts 55.2% in study group, with mean dy_（manu）/dy_（ocu） of 0.61±0.42; while in control group, synclastic adjustment between dy_（auto） and dy_（ocu） accounts 66.1%, with mean dy_（auto）/dy_（ocu） of 0.66±0.65. There was no statistically significant difference in ratio of actual values/Oculyzer topography guided data in horizontal and vertical direction between two groups（P=0.951, 0.621）.CONCLUSION： There is high consistency in angle Kappa adjustment guided manually by Oculyzer and guided automatically by Topolyzer Vario topography during corneal refractive surgery by Wave light EX500 excimer laser.

关键词： angle Kappa adjustment Oculyzer Topolyzer uniformity laser in situ keratomileusis

Satisfiability and reasoning mechanism of terminological cycles in description logic vL

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

Science in China(Series F) 2008年第9期51卷 1204-1214页

作者： WANG ju JIANG YunCheng shen YuMing College of Computer Science and Information Engineering Guangxi Normal University Guilin 541004China

The current research works and the existing problems of terminological cycles in description logics are analyzed in this paper. Referring to the works of Baader F and Nebel B, we aim in a new direction. Firstly, description logic vL is defined, and the description graphs GT and GJ are redefined. A syntax condition for the satisfiability of membership relation is given. By using this syntax condition, we prove the following： The subsumption reasoning in vL with respect to gfp-model, Ifp-model and descriptive model is polynomial.

关键词： description logic terminological cycles description graph model

Modification and application of Fe_(3)O_(4) nanozymes in analytical chemistry:A review

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2023年第5期34卷 46-56页

作者： Jiahe ju Yitong Chen Zhiqiang liu Cheng Huang Yaqi li Dezhao Kong Wei shen sheng Tang School of Environmental and Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China School of Grain Science and Technology Jiangsu University of Science and TechnologyZhenjiang 212003China

In recent years,Fe_(3)O_(4)nanomaterials have received much attention in analytical chemistry due to their excellent magnetic and peroxidase-like *** the catalytic characteristics of Fe_(3)O_(4)nanomaterials is similar to those of horseradish peroxidase(HRP),Fe_(3)O_(4)nanomaterials are also used as peroxidase mimics and have achieved a certain development in many fields based on latest research *** improve the stability and catalytic ability of simple Fe_(3)O_(4)nanomaterials,various modification strategies of Fe_(3)O_(4)nanomaterials have been *** recent advances of these strategies have been presented and *** addition,this paper introduces the application of Fe_(3)O_(4)nanozymes in the detection of food and industrial pollutants,as well as in the field of biosafety.

关键词： Fe_(3)O_(4)nanomaterials Nanozyme Peroxidase-like activity Modification Application

Fuzzy c-means clustering based on spatial neighborhood information for image segmentation

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2010年第2期21卷 323-328页

作者： Yanling li Yi shen Institute of Systems Engineering Department of Control Science and EngineeringHuazhong University of Science and Technology Wuhan 430074 P. R. China College of Computer and Information Technology Xinyang Normal University Xinyang 464000 P. R. China

Fuzzy c-means （FCM） algorithm is one of the most popular methods for image segmentation. However, the standard FCM algorithm is sensitive to noise because of not taking into account the spatial information in the image. An improved FCM algorithm is proposed to improve the antinoise performance of FCM algorithm. The new algorithm is formulated by incorporating the spatial neighborhood information into the membership function for clustering. The distribution statistics of the neighborhood pixels and the prior probability are used to form a new membership func- tion. It is not only effective to remove the noise spots but also can reduce the misclassified pixels. Experimental results indicate that the proposed algorithm is more accurate and robust to noise than the standard FCM algorithm.

关键词： image segmentation fuzzy c-means spatial informa- tion. robust.

Effect of Cryogenic and QPQ Compound Treatment on the Microstructures and Performance of High Speed Steel

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2012年第1期25卷 184-189页

作者： LUO Defu li shen School of Materials Science and Engineering Xihua UniversityChengdu 610039China

China’s High-speed steel cutting tools hold a considerable share in the global market. However, the overproduction of low-end HSS tools causes serious resource waste and low efficiency, which has become one of the major problems in the tool industry in China. So a new Surface Modification technology is developed, which can make the low-end HSS tools into the high-end ones. On the analysis of the mechanism of cryogenic and quenching-polish-quenching(QPQ), the cryogenic and QPQ compound treatment are studied by using ?8 HSS(M2) drills. The nitriding layer and the base of the drill bit are Studied and analyzed, and the mechanism of compound treatment is discussed by the technological parameters adjustment and the combination test of cryogenic, nitrogen, tempering procedures, and several analysis methods such as the optics metallographic microscope, the scanning electronic microscope (SEM), X-ray diffraction and micro hardness. The cutting test is done on the drills by cryogenic treatment, QPQ treatment and cryogenic and QPQ compound treatment separately. The results indicates that the cutting life of HSS (M2) drill can be increased dramatically by cryogenic and QPQ compound treatment.

关键词： high-speed steel (HSS) cryogenic treatment quenching-polish-quenching (QPQ)

Okazaki fragment maturation:nucleases take centre stage

在线全文

学校读者我要写书评

暂无评论

Journal of Molecular Cell Biology 2011年第1期3卷 23-30页

作者： li Zheng Binghui shen Department of Cancer Biology City of Hope National Medical Center and Beckman Research InstituteDuarteCA 91010USA

Completion of lagging strand DNA synthesis requires processing of up to 50 million Okazaki fragments per cell cycle in mammalian *** in yeast,the Okazaki fragment maturation happens approximately a million times during a single round of DNA ***,efficient processing of Okazaki fragments is vital for DNA replication and cell *** this process,primase-synthesized RNA/DNA primers are removed,and Okazaki fragments are joined into an intact lagging strand *** processing of RNA/DNA primers requires a group of structure-specific nucleases typified by flap endonuclease 1(FEN1).Here,we sum-marize the distinct roles of these nucleases in different pathways for removal of RNA/DNA *** findings reveal that Okazaki fragment maturation is highly *** dynamic interactions of polymerase d,FEN1 and DNA ligase I with prolif-erating cell nuclear antigen allow these enzymes to act sequentially during Okazaki fragment *** protein–protein interactions may be regulated by post-translational *** also discuss studies using mutant mouse models that suggest two distinct cancer etiological mechanisms arising from defects in different steps of Okazaki fragment *** that affect the efficiency of RNA primer removal may result in accumulation of unligated nicks and DNA double-strand *** DNA strand breaks can cause varying forms of chromosome aberrations,contributing to development of cancer that associates with aneuploidy and gross chromosomal *** the other hand,mutations that impair editing out of polymerase a incorporation errors result in cancer displaying a strong mutator phenotype.

关键词： Okazaki fragment maturation FEN1 DNA2 PCNA RPA cancer

On the Preconditioning Properties of RHSS Preconditioner for Saddle-Point linear Systems

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

Communications on Applied Mathematics and Computation 2021年第1期3卷 177-187页

作者： ju-li Zhang School of Mathematics Physics and StatisticsShanghai University of Engineering ScienceShanghai 201620China

In this paper,for the regularized Hermitian and skew-Hermitian splitting(RHSS)preconditioner introduced by Bai and Benzi(BIT Numer Math 57:287–311,2017)for the solution of saddle-point linear systems,we analyze the spectral properties of the preconditioned matrix when the regularization matrix is a special Hermitian positive semidefinite matrix which depends on certain *** accurately describe the numbers of eigenvalues clustered at(0,0)and(2,0),if the iteration parameter is close to *** estimate about the condition number of the corresponding eigenvector matrix,which partly determines the convergence rate of the RHSS-preconditioned Krylov subspace method,is also studied in this work.

关键词： Saddle-point linear systems RHSS preconditioner Preconditioning properties Matrix similar transformation Condition number of eigenvector matrix