检索结果-南通市图书馆

Advances in metal-organic framework-derived single-atom catalysts for biomedicine

在线全文

学校读者我要写书评

暂无评论

Nano Materials Science 2024年第4期6卷 396-412页

作者： Li qiu Yingxi Lin Jun Song Chen Hong Luo Rui Wu Department of Ultrasound West China Second University Hospital Sichuan University Key Laboratory of Obstetric and Gynecologic and Pediatric Diseases and Birth Defects of Ministry of Education Sichuan University School of Materials and Energy University of Electronic Science and Technology of China Interdisciplinary Materials Research Center Institute for Advanced Study Chengdu University

As a alternative for natural enzymes, nanozymes has shown enzyme-like activity and selectivity in the field of various kinds of biomedical application, which has attracted considerable research interest. Recently, single-atom catalysts(SACs) have been extensively studied due to their similar active centers, coordination environment and better stability to natural enzymes. Metal-organic frameworks(MOFs) have been demonstrated as highly promising precursors for the synthesis of various types of SACs. MOF-derived SACs can not only significantly enhance the catalytic activity, but also improve the selectivity of nanozymes due to tunable coordination environment and structure, thereby receiving widespread attention in biomedicine. This review provided an overview of the preparation strategies for MOF-derived SACs, and then detailed the latest research progress of the SACs in the biomedical field for cancer, antibacterial, antioxidation and biosensors. Finally, the challenges and potential future opportunities of MOF-derived SACs in biomedical applications are proposed.

关键词： Biomedicine MOF-Derived SAC nanozymes Catalytic mechanisms

Significant enhancement in local thermal conductivity of erythritol at interface with nanoparticles due to their interaction

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2024年第8期17卷 7726-7736页

作者： Ning Cao Yanhui Feng Kening Yan Zihan Liu Jiawei Wan Lin qiu School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Biochemical Engineering Key Laboratory of Biopharmaceutical Preparation and DeliveryInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China

When nano-fillers are used to enhance the thermal conductivity of organic phase change materials(PCMs),the naturally formed interface is considered to hinder thermal transport of the composite ***,the effect of the interface on the thermal properties of surrounding PCM has not been fully *** this paper,three composite PCMs(Ery@SiC,Ery@SiO_(2) and Ery@Si_(3)N_(4))were prepared by melt-blending *** local thermal conductivity and reduced Young’s modulus(E^(*))of the erythritol at the interface and far away from the interface in the composite PCMs were simultaneously measured by scanning thermal microscopy(SThM).The results revealed significant enhancement in local thermal conductivity of erythritol at the interface and its obvious positive correlation with E^(*).For different composite PCMs,molecular dynamics(MD)simulations suggested that the increase in intrinsic thermal conductivity and E^(*)of erythritol is attributed to the increase in interaction energy between erythritol and nanoparticles,as more erythritol phonon vibrations transform from localized mode to delocalized mode and erythritol has a higher density at the *** findings will provide new ideas for the design of PCM for energy storage.

关键词： scanning thermal microscopy phase change materials thermal conductivity reduced Young’s modulus interaction energy phonon participation ratio

Clinical risk factors for preterm birth and evaluating maternal psychology in the postpartum period

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

World Journal of Psychiatry 2024年第5期14卷 661-669页

作者： Jia-Jun Chen Xue-Jin Chen qiu-Min She Jie-Xi Li qiu-Hong Luo Department of Clinical Laboratory Shenzhen Bao’an District Songgang People’s HospitalShenzhen 518000Guangdong ProvinceChina Department of Otolaryngology Head and Neck Surgery Outpatient Shenzhen Children’s HospitalShenzhen 518000Guangdong ProvinceChina Department of Prevention and Health Care Shenzhen Bao’an District Songgang People’s HospitalShenzhen 518000Guangdong ProvinceChina Department of Obstetrics Shenzhen Bao’an District Songgang People’s HospitalShenzhen 518000Guangdong ProvinceChina

BACKGROUND Although the specific pathogenesis of preterm birth(PTB)has not been thoroughly clarified,it is known to be related to various factors,such as pregnancy complications,maternal socioeconomic factors,lifestyle habits,reproductive history,environmental and psychological factors,prenatal care,and nutritional *** has serious implications for newborns and families and is associated with high mortality and ***,the prediction of PTB risk can facilitate early intervention and reduce its resultant adverse *** To analyze the risk factors for PTB to establish a PTB risk prediction model and to assess postpartum anxiety and depression in *** A retrospective analysis of 648 consecutive parturients who delivered at Shenzhen Bao’an District Songgang People’s Hospital between January 2019 and January 2022 was *** to the diagnostic criteria for premature infants,the parturients were divided into a PTB group(n=60)and a full-term(FT)group(n=588).Puerperae were assessed by the Self-rating Anxiety Scale(SAS)and Self rating Depression Scale(SDS),based on which the mothers with anxiety and depression symptoms were screened for further *** factors affecting PTB were analyzed by univariate analysis,and the related risk factors were identified by logistic *** According to univariate analysis,the PTB group was older than the FT group,with a smaller weight change and greater proportions of women who underwent artificial insemination and had gestational diabetes mellitus(P<0.05).In addition,greater proportions of women with reproductive tract infections and greater white blood cell(WBC)counts(P<0.05),shorter cervical lengths in the second trimester and lower neutrophil percentages(P<0.001)were detected in the PTB group than in the FT *** PTB group exhibited higher postpartum SAS and SDS scores than did the FT group(P<0.0001),with a higher number of mothers experiencing anxiety and depress

关键词： Preterm birth Risk factors Postpartum psychological state Risk model Prediction

A Mode-switching Strategy of Droop Control for VSC-MTDC Systems Considering Maximum DC Voltage Regulation Capability

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

CSEE Journal of Power and Energy Systems 2024年第3期10卷 903-912页

作者： Yizhen Wang Fengliang qiu Zhongguan Wang Yirun Ji Zhengguang Chen Chengshan Wang Key Laboratory of Smart Grid of Ministry of Education Tianjin UniversityTianjin 300072China Electric Power Research Institute of State Grid JiBei Electric Power Co.Ltd. Beijing 100045China State Grid Corporation of China Beijing 100031China IEEE

To achieve the goal of carbon neutrality,renewable energy integration through a voltage source converter based multi-terminal direct current(VSC-MTDC)system has been identified as a promising *** tackle the significant DC voltage over-limit problem in a VSC-MTDC system during disturbances,this paper proposes a mode-switching strategy of droop control considering maximum DC voltage regulation *** close relationship between node injection powers and node DC voltages in the MTDC system is elaborated,and the most effective regulation approach of local injection power for limiting DC voltage deviation is *** operating point trajectories of different droop control explains that the DC voltage deviation can be minimized by fully utilizing the capacity of ***,the mode-switching strategy with the maximum DC voltage regulation capability is realized by the switching between the voltage droop control and the constant maximum power *** addition,a mode recovery process and a smooth switching method are developed to make converters regain the capability of maintaining DC voltage and reduce power fluctuation during mode switching,***,three cases are investigated to verify the effectiveness of the proposed mode-switching *** with simulation results of the conventional droop control and the DC voltage deviation-dependent droop control,better performance of transient and steady-state DC voltage deviation is achieved through the proposed strategy.

关键词： Droop control maximum DC voltage regulation capability mode-switching VSC-MTDC

Exploring the Roles of Single Atom in Hydrogen Peroxide Photosynthesis

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

Nano-Micro Letters 2024年第2期16卷 32-67页

作者： Kelin He Zimo Huang Chao Chen Chuntian qiu Yu Lin Zhong Qitao Zhang International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518000China Queensland Micro‑and Nanotechnology Centre School of Environment and ScienceGriffith UniversityNathanQLD 4222Australia Institute for Sustainable Transformation School of Chemical Engineering and Light IndustryGuangdong University of TechnologyGuangzhou 51006China ZJU‑Hangzhou Global Scientific and Technological Innovation Center Zhejiang UniversityHangzhou 311215China

This comprehensive review provides a deep exploration of the unique roles of single atom catalysts(SACs)in photocatalytic hydrogen peroxide(H_(2)O_(2))*** offer multiple benefits over traditional catalysts such as improved efficiency,selectivity,and flexibility due to their distinct electronic structure and unique *** review discusses the critical elements in the design of SACs,including the choice of metal atom,host material,and coordination environment,and how these elements impact the catalytic *** role of single atoms in photocatalytic H_(2)O_(2)production is also analysed,focusing on enhancing light absorption and charge generation,improving the migration and separation of charge carriers,and lowering the energy barrier of adsorption and activation of *** these advantages,several challenges,including H_(2)O_(2)decomposition,stability of SACs,unclear mechanism,and low selectivity,need to be *** towards the future,the review suggests promising research directions such as direct utilization of H_(2)O_(2),high-throughput synthesis and screening,the creation of dual active sites,and employing density functional theory for investigating the mechanisms of SACs in H_(2)O_(2)*** review provides valuable insights into the potential of single atom catalysts for advancing the field of photocatalytic H_(2)O_(2)production.

关键词： Single atom catalysts H_(2)O_(2)photosynthesis Catalyst design and optimization

Clustering for Bivariate Functional Data

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2024年第3期40卷 613-629页

作者： Shi-yun CAO Yan-qiu ZHOU Yan-ling WAN Tao ZHANG School of Science Guangxi University of Science and TechnologyLiuzhou 545006China School of Marxism Guangxi University of Science and TechnologyLiuzhou 545006China Key Laboratory of Intelligent Information Processing and Graph Processing Guangxi University of Science and TechnologyLiuzhou 545006China

In this paper,we consider the clustering of bivariate functional data where each random surface consists of a set of curves recorded repeatedly for each *** k-centres surface clustering method based on marginal functional principal component analysis is proposed for the bivariate functional data,and a novel clustering criterion is presented where both the random surface and its partial derivative function in two directions are *** addition,we also consider two other clustering methods,k-centres surface clustering methods based on product functional principal component analysis or double functional principal component *** results indicate that the proposed methods have a nice performance in terms of both the correct classification rate and the adjusted rand *** approaches are further illustrated through empirical analysis of human mortality data.

关键词： bivariate functional data -centres surface clustering functional principal component analysis partial derivative function

Hydrogen production from hydrolysis of NaBH_(4) solution over Co-Fe-B@g-C_(3)N_(4)/NF thin film catalyst

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第6期43卷 2648-2659页

作者： Yan Wang Jia-Xin Ma Jian Ren Di Zhang Feng-Yan Xu Ke Zhang Zhong-qiu Cao qiu-Ju Sun Guo-De Li Shi-Wei Wu Hong-Hui Chen College of Chemistry and Chemical Engineering Shenyang Normal UniversityShenyang 110034China Experimental Center Shenyang Normal UniversityShenyang 110034China Hunan Shande Energy Storage New Materials Research Institute Limited Company Changde 415000China

In this study,the double loaded Co-Fe-B@g-C_(3)N_(4)/NF(NF:Ni foam)thin film catalysts were prepared for the first time via chemical deposition method at room *** optimizing the reducing agent concentration to 0.9 mol·L^(-1),the as-obtained Co-Fe-B@g-C_(3)N_(4)/NF exhibited the twisted ribbon structure with more distinct three-dimensional hierarchy and the smaller particle size,showing the good catalytic property for the hydrolysis of NaBH_(4)*** H_(2)generation rate of Co-Fe-B@g-C_(3)N_(4)/NF and binary Co-B@g-C_(3)N_(4)/NF under visible light irradiation surpassed the value under natural *** apparent activation energy of Co-Fe-B@g-C_(3)N_(4)/NF(45.0 kJ·mol^(-1))under visible light irradiation was obviously reduced when compared with the natural condition(48.4 kJ·mol^(-1))and binary Co-B@g-C_(3)N_(4)/NF(60.6 kJ·mol^(-1))under visible light ***,the catalytic performance of the optimized Co-Fe-B@g-C_(3)N_(4)/NF thin film catalyst was superior to most of the reported non-noble metal and even noble metal ***,it illustrated that the catalytic H_(2)production performance of Co-Fe-B@g-C_(3)N_(4)/NF thin film was distinctly improved after the introduction of light and multicomponent recombination.

关键词： Sodium borohydride Co-Fe-B@g-C_(3)N_(4)/NF catalyst Chemical deposition Hydrogen production

叶酸对高血糖孕鼠子代心脏发育相关蛋白表达的影响

在线全文

学校读者我要写书评

暂无评论

安徽医科大学学报 2014年第7期49卷 905-909页

作者：詹一科仇小强马若嘉桂林医学院附属医院心血管内科桂林541001 广西医科大学公共卫生学院南宁530021

目的探讨叶酸对高血糖孕鼠子代心脏发育相关蛋白GATA4、Nkx2.5表达的影响。方法将受孕的40只SD大鼠随机均分为5组:正常对照组、模型组、叶酸第3天组(FA3rd组)、叶酸第7天组(FA7th组)、叶酸第15天组(FA15th组);确认受孕后,除正常对照组外... 详细信息

目的探讨叶酸对高血糖孕鼠子代心脏发育相关蛋白GATA4、Nkx2.5表达的影响。方法将受孕的40只SD大鼠随机均分为5组:正常对照组、模型组、叶酸第3天组(FA3rd组)、叶酸第7天组(FA7th组)、叶酸第15天组(FA15th组);确认受孕后,除正常对照组外,其他4个组一次性按38 mg/kg予腹腔注射链脲佐菌素(STZ)复制高血糖孕鼠模型,其中FA3rd组、FA7th组、FA15th组3个干预组分别从孕第3、7、15天开始,每天予叶酸0.8 mg/kg灌胃至妊娠结束。在孕鼠孕21 d时取子鼠心脏,HE染色观察子鼠心肌;免疫组化法及Western blot法检测子鼠心脏发育相关基因GATA4、Nkx2.5的蛋白表达。结果 STZ干预后孕鼠血糖明显升高(P<0.05),部分子鼠心肌可见损伤;免疫组化显示,GATA4蛋白在心房、心室、室间隔、瓣膜均有表达;Nkx2.5蛋白在心房、心室、室间隔均有表达,但在瓣膜未见明显表达;Western blot显示,与正常对照组比较,STZ干预组GATA4及Nkx2.5蛋白表达均下调(P<0.05),FA3rd组及FA7th组的蛋白表达水平均显著高于模型组(P<0.05),且FA3rd组的蛋白上调程度高于FA7th组(P<0.05),FA15th组与模型组的蛋白表达水平差异无统计学意义。结论孕鼠的高血糖状态可使子代心脏损伤及心脏发育相关蛋白GATA4、Nkx2.5表达水平下调;及时补充叶酸可上调GATA4、Nkx2.5蛋白表达水平,对处于母体高血糖状态影响下的子鼠心脏的发育可能具有保护作用。

关键词：叶酸心脏发育子代母体高血糖

在线全文

学校读者我要写书评

暂无评论

中国热带作物产业发展与科技创新

热带农业科学 2010年第12期30卷 1-6页

作者：邱小强刘海清中国热带农业科学院海南儋州571737 中国热带农业科学院科技信息研究所海南儋州571737 中国热带农业科学院热带农业经济研究所海南儋州571737

热带农业科技创新是实现热带农业现代化的法宝之一,热带农业增效、热区农民增收的关键在于科技创新。在阐述热带作物产业发展现状的基础上,分析热带农业科技创新的紧迫性,并就如何通过科技创新来加快热带作物产业的发展提出相关的政策... 详细信息

热带农业科技创新是实现热带农业现代化的法宝之一,热带农业增效、热区农民增收的关键在于科技创新。在阐述热带作物产业发展现状的基础上,分析热带农业科技创新的紧迫性,并就如何通过科技创新来加快热带作物产业的发展提出相关的政策建议。

关键词：热带作物科技创新政策