检索结果-南通市图书馆

ASSESSMENT OF THE SFIM ALGORITHM

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Geographical Science 2004年第1期14卷 48-56页

作者： xuhan-qiu CollegeofEnvironmentandResources FuzhouUniversityFuzhou350002P.R.China

Fusion of images with different spatial and spectral resolutions can improve the visualization of the images. Many fusion techniques have been developed to improve the spectral fidelity and/or spatial texture quality of fused imagery. Of them, a recently proposed algorithm, the SFIM (Smoothing Filter-based Intensity Modulation), is known for its high spectral fidelity and simplicity. However, the study and evaluation of the algorithm were only based on spectral and spatial criteria. Therefore, this paper aims to further study the classification accuracy of the SFIM-fused imagery. Three other simple fusion algorithms, High-Pass Filter (HPF), Multiplication (MLT), and Modified Brovey (MB), have been employed for further evaluation of the SFIM. The study is based on a Landsat-7 ETM+ sub-scene covering the urban fringe of southeastern Fuzhou City of *** effectiveness of the algorithm has been evaluated on the basis of spectral fidelity, high spatial frequency information absorption, and classification accuracy. The study reveals that the difference in smoothing filter kernel sizes used in producing the SFIM-fused images can affect the classification accuracy. Compared with three other algorithms, the SFIM transform is the best method in retaining spectral information of the original image and in getting best classification results.

关键词： data fusion SFIM algorithm evaluation classification remote sensing

GSH-responsive camptothecin prodrug-based hybrid micellar nanoparticles enable antitumor chemo-immunotherapy by PD-L1 knockdown

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第1期16卷 834-848页

作者： Xi Tan Hong zhou Chenhui Wang xuhan Liu Xiangliang Yang Wei Liu College of Life Science and Technology Huazhong University of Science and TechnologyWuhan 430074China The Key Laboratory for Human Disease Gene Study of Sichuan Province and the Department of Laboratory Medicine Sichuan Provincial People’s HospitalUniversity of Electronic Science and Technology of ChinaChengdu 611731China Department of Emergency Medicine Shenzhen University General HospitalShenzhen University Clinical Medical AcademyShenzhen 518060China National Engineering Research Center for Nanomedicine Huazhong University of Science and TechnologyWuhan 430074China

The combinational chemo-immunotherapy as a novel treatment strategy has been widely studied and applied in clinic to enhance antitumor therapeutic efficacy and relieve side *** interference(RNAi)targeting PD-L1 via inhibiting novo production of PD-L1 will overcome the innate and adaptive PD-L1 expression during chemotherapy,thus enable sustained and efficient immune checkpoint blockade(ICB)to active antitumor immune ***,we designed a glutathione(GSH)-responsive camptothecin(CPT)prodrug-based hybrid micellar nanoparticles(siPD-L1@HM-CPT)to achieve synergistic antitumor chemoimmunotherapy by PD-L1 ***-L1@HM-CPT derived from the one-step loading PD-L1 siRNA(siPD-L1)into the CPT prodrug-based hybrid micelles(HM-CPT)which were co-assembled from biodegradable polyphosphoesters-based prodrug CPT-ss-PAEEP15 and stabilizer DSPE-PEG,showed high loading efficiency,GSH-responsive drug release,and excellent stability and ***-L1@HM-CPT achieved simultaneously the co-delivery of CPT and siPD-L1 in vitro and in vivo,high accumulation at the tumor sites,and rapid intracellular release to promote antitumor efficacy via sensitizing CPT chemotherapy,inducing strong immunogenic cell death(ICD)and sustained ICB to improve intratumoral CD8+T cells *** addition,the antitumor immunity response limited by the differentiated immunogenicity,intrinsic PD-L1 expression,and intracellular GSH level was facilitated by efficient ICD and ICB from silencing PD-L1 and synergistic CPT chemosensitization in our experimental B16-F10 and 4T1 tumor *** study might offer a perspective on designing novel co-delivery nanoparticles by convenient and controllable preparation for antitumor chemo-immunotherapy.

关键词： camptothecin prodrug hybrid micellar nanoparticles glutathione(GSH)-responsive PD-L1 knockdown chemoimmunotherapy

Remote sensing of the urban heat island and its changes in Xiamen City of SE China

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 Environmental Sciences 2004年第2期16卷 276-281页

作者： xuhan-qiu CHENBen-qing CollegeofEnvironinenlalandResourcesEngineering FuzhouUniversityFuzhou350002.China.

World-wide urbanization has significantly modified the landscape, which has important climatic implications across all scales due to the simultaneous removal of natural land cover and introduction of urban materials. This resulted in a phenomenon known as an urban heat island(UHI). A study on the UHI in Xiamen of China was carried out using remote sensing technology. Satellite thermal infrared images were used to determine surface radiant temperatures. Thermal remote sensing data were obtained from band 6 of two Landsat TM/ETM\++ images of 1989 and 2000 to observe the UHI changes over 11-year period. The thermal infrared bands were processed through several image enhancement technologies. This generated two 3-dimension-perspective images of Xiamen's urban heat island in 1989 and 2000, respectively, and revealed heat characteristics and spatial distribution features of the UHI. To find out the change of the UHI between 1989 and 2000, the two thermal images were first normalized and scaled to seven grades to reduce seasonal difference and then overlaid to produce a difference image by subtracting corresponding pixels. The difference image showed an evident development of the urban heat island in the 11 years. This change was due largely to the urban expansion with a consequent alteration in the ratio of sensible heat flux to latent heat flux. To quantitatively compare UHI, an index called Urban-Heat-Island Ratio Index(URI) was created. It can reveal the intensity of the UHI within the urban area. The calculation of the index was based on the ratio of UHI area to urban area. The greater the index, the more intense the UHI was. The calculation of the index for the Xiamen City indicated that the ratio of UHI area to urban area in 2000 was less than that in 1989. High temperatures in several areas in 1989 were reduced or just disappeared, such as those in old downtown area and Gulangyu Island. For the potential mitigation of the UHI in Xiamen, a long-term heat island red

关键词： remote sensing urban heat island urban-heat-island ratio index digital brightness model Xiamen City

Tb^(3+)-nucleic acid probe-based label-free and rapid detection of mercury pollution in food

在线全文

学校读者我要写书评

暂无评论

Food Science and Human Wellness 2024年第2期13卷 993-998页

作者： xuhan Xia Chenxi zhou Yulin Zhu Yi Dong Qiang He Mohammad Rizwan Khan Yuanlong Chi Rosa Busquets Ruijie Deng Yao Ren College of Biomass Science and Engineering Healthy Food Evaluation Research CenterSichuan UniversityChengdu 610065China Department of Chemistry College of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia School of Life Sciences Pharmacy and ChemistryKingston University LondonKingston Upon Thames KT12EEUK

Mercury is a threatening pollutant in food,herein,we developed a Tb^(3+)-nucleic acid probe-based label-free assay for mix-and-read,rapid detection of mercury *** assay utilized the feature of light-up fluorescence of terbium ions(Tb^(3+))via binding with single-strand *** ion,Hg^(2+)induced thymine(T)-rich DNA strand to form a double-strand structure(T-Hg^(2+)-T),thus leading to fluorescence *** on the principle,Hg^(2+)can be quantified based on the fluorescence of Tb^(3+),the limit of detection was 0.0689μmol/L and the linear range was 0.1-6.0μmol/*** to the specificity of T-Hg^(2+)-T artificial base pair,the assay could distinguish Hg^(2+)from other metal *** recovery rate was ranged in 98.71%-101.34%for detecting mercury pollution in three food *** assay is low-cost,separation-free and mix-to-read,thus was a competitive tool for detection of mercury pollution to ensure food safety.

关键词： Mercury pollution Food safety Nucleic acid probe Label-free Terbium

Metamaterial-enabled arbitrary on-chip spatial mode manipulation

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2022年第7期11卷 1482-1492页

作者： Jinlong Xiang Zhiyuan Tao Xingfeng Li Yaotian Zhao Yu He xuhan Guo Yikai Su State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China

On-chip spatial mode operation,represented as mode-division multiplexing(MDM),can support high-capacity data communications and promise superior performance in various systems and numerous applications from optical sensing to nonlinear and quantum ***,the scalability of state-of-the-art mode manipulation techniques is significantly hindered not only by the particular mode-order-oriented design strategy but also by the inherent limitations of possibly achievable mode ***,metamaterials capable of providing subwavelength-scale control of optical wavefronts have emerged as an attractive alternative to manipulate guided modes with compact footprints and broadband ***,we propose a universal yet efficient design framework based on the topological metamaterial building block(BB),enabling the excitation of arbitrary high-order spatial modes in silicon *** simply programming the layout of multiple fully etched dielectric metamaterial perturbations with predefined mathematical formulas,arbitrary high-order mode conversion and mode exchange can be simultaneously realized with uniform and competitive *** extraordinary scalability of the metamaterial BB frame is experimentally benchmarked by a record high-order mode operator up to the *** a proof of conceptual application,an 8-mode MDM data transmission of 28-GBaud 16-QAM optical signals is also verified with an aggregate data rate of 813 Gb/s(7%FEC).This user-friendly metamaterial BB concept marks a quintessential breakthrough for comprehensive manipulation of spatial light on-chip by breaking the long-standing shackles on the scalability,which may open up fascinating opportunities for complex photonic functionalities previously inaccessible.

关键词： arbitrary proof breakthrough

Oxygen-vacancy-anchoring Ni_(x)O_(y) loading towards efficient hydrogen evolution via photo-thermal coupling reaction

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10期30卷 77-87,I0003页

作者： Qiliang Wu Zheng Li xuhan Zhang Chenyu Xu Mingjiang Ni Kefa Cen Yanwei Zhang State Key Laboratory of Clean Energy Utilization Zhejiang UniversityHangzhou 310027ZhejiangChina Department of Chemical and Materials Engineering University of AlbertaEdmonton ABT6G 1H9Canada

Oxygen vacancy(Vo)is a significant component in defect *** present work reports the anchoring effects of initial Vo for further loading modifications and the reducing capacity of photoinduced Vo for pure water ***,we propose Ni-loaded Cu-doped TiO_(2)(NCT)materials by successive doping and *** continuously added Ni ions should accumulate around the Vos and gradually grow into complete nickel oxide crystals,achieving a higher average valence state of the Ni *** crystals can be detected on a 0.5%NCT sample,while the structure of Ni_(2)O_(3) has been confirmed with a higher nickel mass ***,the introduction of nickel oxide effectively improves the photochemical and electrochemical performance by the interface charge separation,finally reaching an H2 yield of 30.6 pmol/g-cat on 0.5%NCT for Vo-based photo-thermal coupling reaction,which consists of Vo generation in photo and Vo consumption in thermal *** situ infrared spectroscopy further indicated that the presence of high valence state nickel oxide hindered the H2 formation but effectively promoted the conventional oxidizing reaction,with an H2 yield of 20.6 mmol/g-cat in a methanol-water reaction on the 2.0%NCT *** summary,Vo controls the morphological structure of Ni loading and produces diverse effects for reactions with dissimilar mechanisms,which provides a novel way to design modifications for promoting various chemical reactions.

关键词： Oxygen vacancy Nickel oxide Water splitting Photo-thermal coupling reaction DFT calculation

Comparative Study on Corrosion Behavior and Mechanism of As-Cast Mg-Zn-Y and Mg-Zn-Gd Alloys

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2023年第2期36卷 310-322页

作者： Guoqiang Xi xuhan Zhao Yanlong Ma Yu Mou Ju Xiong Kai Ma Jingfeng Wang College of Material Science and Engineering Chongqing University of TechnologyChongqing400054China College of Materials Science and Engineering Chongqing UniversityChongqing400044China

Rare earth(RE)elements have large solid solubility in magnesium and are widely used to regulate the microstructure and property of advanced magnesium ***,different kinds of RE elements have different effects on microstructure and property of the *** this study,a Mg-Zn-Y alloy and a Mg-Zn-Gd alloy with alloying elements of the same atomic percentage were designed to clarify the effect of yttrium(Y)and gadolinium(Gd)on the corrosion behavior of as-cast MgZn_(2)_Y(2.66) and MgZn_(2)Gd_(2.66)*** results show that the MgZn_(2)_Y(2.66) alloy is mainly composed ofα-Mg phase and long period stacking ordered(LPSO)phase,while MgZn_(2)Gd_(2.66)alloy is mainly composed ofα-Mg phase and(Mg,Gd)_(3)Zn phase(W phase).Generally speaking,the corrosion phenomena of the two alloys in 3.5 wt%NaCl solution are *** the early stages of exposure,the alloys underwent uniform corrosion at a relatively low corrosion *** prolonged exposure,localized corrosion became dominated and the corrosion rate was greatly ***,the corrosion rate of the MgZn_(2)_Y(2.66) alloy,in terms of the corrosion current density,is about one order of magnitude lower than that of the MgZn_(2)Gd_(2.66)*** high corrosion resistance of the MgZn_(2)_Y(2.66) alloy is mainly attributed to the presence of LPSO phase in form of continuous networks and the relatively high corrosion resistance of the corrosion product layer on the alloy.

关键词： Magnesium alloys Rare earth Long period stacking ordered(LPSO)phase Microstructure Corrosion

色素沉着绒毛结节性滑膜炎研究趋势的可视化分析

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国组织工程研究 2025年第15期29卷 3290-3300页

作者：熊冰朗曹旭含张程郭紫嫣孙旭东白子兴孙卫东中国中医科学院望京医院骨关节二科北京市100015 中国中医科学院望京医院骨关节三科北京市100015 北京中医医院顺义医院骨伤科北京市101300

背景:色素沉着绒毛结节性滑膜炎在病因、临床表现、诊断与治疗等研究领域依然存在较大争议,对色素沉着绒毛结节性滑膜炎进行文献计量学及可视化研究可以理清该领域研究发展脉络,为未来的研究指明方向。目的:分析色素沉着绒毛结节性滑膜... 详细信息

背景:色素沉着绒毛结节性滑膜炎在病因、临床表现、诊断与治疗等研究领域依然存在较大争议,对色素沉着绒毛结节性滑膜炎进行文献计量学及可视化研究可以理清该领域研究发展脉络,为未来的研究指明方向。目的:分析色素沉着绒毛结节性滑膜炎全球研究现状、热点及趋势。方法:选用Web of Science及中国知网数据库检索1995-2023年所有与色素沉着绒毛结节性滑膜炎相关的文献出版物,用Citespace和Bibliometrics软件对所有文献进行聚类、共现和突现词分析。Web of Science核心合集数据库采用主题词加自由词进行检索,中国知网数据库通过主题词进行检索。最终纳入986篇英文文献和599篇中文文献。结果与结论:①美国在该领域研究占有绝对领导地位,共发文数量、H指数和被引次数均排名第一。中国总发文量排名第4,H指数排名第12,发文质量与国际合作方面仍有待加强。②中国知网数据库相关研究聚类分析显示排名前5的聚类为放射治疗、软组织肉瘤、类风湿性关节炎、磁共振影像和诊断。③持续突现至2023年的关键词有集落刺激因子1、腱鞘巨细胞瘤、个案报道、染色体易位、放射治疗、表达和激酶。④依据关键词及共被引文献分析发现,关于色素沉着绒毛结节性滑膜炎临床特征的研究、集落刺激因子1抑制剂新药开发,以及集落刺激因子1抑制剂在治疗过程中的应用是目前的研究热点。⑤结合主题演化及现有研究热点分析,未来在明确该病病因、发病机制及临床特征的基础上,提高色素沉着绒毛结节性滑膜炎诊断准确率、增强治疗的精准性、降低治疗后复发率将是需要重点关注的问题。

关键词：文献计量学可视化 Citespace 色素沉着绒毛结节性滑膜炎文献聚类分析共现分析关节热点

Improving Catalytic Performance of Burkholderiacepacia Lipase by Chemical Modification with Functional Ionic Liquids

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2018年第2期34卷 279-284页

作者： XU Chao YIN xuhan ZHANG Chuan CHEN Hongyue HUANG He HU Yi State Key Laboratory of Materials-Oriented Chemical Engineering School of Pharmaceutical Sciences Nanjing Tech University Nanjing 210009 P. R. China

Various imidazolium and choline-based functional ionic liquids（Ks） comprising different cations and anions were grafted onto Burkholderiacepacia lipase（BCL） through surface amino acids coupling. The catalytic activity, thermostability, organic solvent tolerance and adaptability to temperature and pH changes of the modified BCL were then evaluated in olive oil hydrolysis reaction. The results showed that different combinations of cations and anions in ILs had important influence on the catalytic performance of the modified lipases. BCL modified with IL [Choline][H2PO4] was the most improved lipase, in which increases by 1.2 folds in relative activity, 2.5 folds in typi- cal proton solvent（10% methanol, volume fraction）, and 1.4 folds in thermostability（after incubation at 70℃ for 2 h） were achieved in relative toits native form. BCL modified with [HOOCEPEG350[M][BF4] had higher optimal tempe- rature and pH, and better thermosability compared with the native and other modified BCLs. The conformational changes of BCLs were also confirmed by fluorescence spectroscopy and circular dichroism spectroscopy.

关键词： Burkholderiacepacia lipase Chemical modification Ionic liquid Catalytic activity