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The role of land use on the local climate and air quality during calm inter-monsoon in a tropical city

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Geoscience Frontiers 2019年第2期10卷 405-415页

作者： M.C.G.Ooi A.Chan M.J.Ashfold M.Y.Oozeer K.I.Morris S.S.K.Kong Department of Atmospheric Science "Central University" Department of Civil Engineering University of Nottingham Malaysia Campus School of Environmental and Geographical Sciences University of Nottingham Malaysia Campus Department of Geography and Environmental Management University of Waterloo Center of Excellence for Sustainable innovation and Research Initiative (CESIRI) Department of Mechanical Engineering Ashesi University College

The modification of land use is known to be a major climate change driver to the local warming and air quality in cities. Despite the reduction of NOx over the years, the Selangor state has captured a higher level of O_3 in year 2011. The measurement result has shown that the surge in O_3 level was attributed to the reduction of NO_x/NMHC ratio. This paper hence attempted to identify the role of land use change from 1999 to 2011 on the ground ozone air quality in the tropical urban conurbation, Greater Kuala Lumpur(GKL), Selangor, Malaysia. With the state-of-the-art chemical weather prediction tool, WRFChem, the external synoptic factors and emission inventory were controlled when comparing the chronological land use changes. The results showed that the urban-induced temperature and wind bias in the tropical region has induced stronger wind to disperse the NO_x and carries the TVOC from the suburban to the downwind urban region. The reduction of NO_x/TVOC has gradually shifted towards the optimum O_3 formation regime in 2011. The formation of highly concentrated ozone becomes more sensitive to the increment of TVOC as the NO_x level reduces in the urban. This highlights the essential involvement of TVOC in the ozone formation in lieu of the NOx reduction in the tropical city, a region with growing emitter of reactive biogenic ozone precursors.

关键词： Land use change Urban Ground ozone TVOC WRF-Chem Tropics

Skill-assessments of statistical and Ensemble Kalman Filter data assimilative analyses using surface and deep observations in the Gulf of Mexico

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Frontiers of Earth Science 2013年第3期7卷 271-281页

作者： Zhibin SUN Lie-Yauw OEY Yi-Hui ZHOU Universities Space Research association Columbia MD 21044 USA Princeton University AOS Sayre Hall Forrestal Campus Princeton NJ 08544 USA Department of Biostatistics University of North Carolina Chapel Hill NC 27599 USA

A new data assimilation algorithm （Quasi- EnKF） in ocean modeling, based on the Ensemble Kalman Filter scheme, is proposed in this paper. This algorithm assimilates not only surface measurements （sea surface height）, but also deep （-2000 m） temperature observations from the Gulf of Mexico into regional ocean models. With the use of the Princeton Ocean Model （POM）, integrated for approximately two years by assimilating both surface and deep observations, this new algorithm was compared to an existing assimilation algorithm （Mellor-Ezer Scheme） at different resolutions. The results show that, by comparing the observations, the new algorithm out-performs the existing one.

关键词： data assimilation deep observation Gulf of Mexico

Study on the propagation velocity of internal solitary waves in the Andaman Sea using Terra/Aqua-MODIS remote sensing images

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Journal of Oceanology and Limnology 2021年第6期39卷 2195-2208页

作者： Lina SUN Jie ZHANG Junmin MENG First Institute of Oceanography Ministry of Natural ResourcesQingdao 266061China technology innovation Center for Ocean Telemetry Ministry of Natural ResourcesQingdao 266061China

The Andaman Sea has been a classic study region for internal solitary waves(ISWs)for several decades,and extraordinarily large ISWs are characteristic of the Andaman Sea in the Indian *** paper presents results on the estimation of the propagation velocity of ISWs in the Andaman Sea that were tracked using 195 image pairs acquired by MODIS National Aeronautics and Space Administration(NASA)Terra/Aqua satellites between January 2014 and December 2018.A total of 562 ISWs were identified during the period,and the results of the propagation velocity distribution of ISWs in the Andaman Sea are *** estimated propagation velocity of ISWs agrees well with the theoretical results derived from the Korteweg-de Vries(KdV)equation using monthly climatology stratification data and local *** ISW propagation velocity decreases as they propagate from deep to shallow water;the maximum propagation velocity of 3.27 m/s was estimated on the western side of the Nicobar Islands and minimum speed of 0.54 m/s occurred in the shallow water region of the southeastern Andaman *** results show that the ISW propagation characteristics differ in the northern,central,and southern regions of the Andaman *** the northern Andaman Sea,the velocity of ISWs propagating westward was greater than that of ISWs propagating eastward at the same water *** the central Andaman Sea,the propagation velocity of the ISWs differed over a small area at a depth of 2500 m,and the velocity of ISWs in the deep mixing layer in winter was higher than that in the shallow mixing layer in *** variations in ISW propagation velocity were analyzed in the southern Andaman Sea,and the velocity of ISWs differed greatly in shallow water and was not significantly different in deep *** depth and monthly stratification play vital roles in controlling the phase speed of ISWs in the Andaman *** study will provide a basis for the propagation and prediction of ISWs in the Anda

关键词： internal solitary waves propagation velocity remote sensing Andaman Sea

Controlling Chaos for the Buck Converter Using a Nonlinear Controller in the Form of the Cubic Difference 36

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Controlling Chaos for the Buck Converter Using a Nonlinear C...

Directed flow of isospin sensitive fragments within a modified clusterization algorithm in heavy-ion collisions

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作者： Meimei Jia School of Electric Power Jinchuan CampusInner Mongolia University of Technology

ISBN: (纸本)9781538629185

When the Buck converter is under the chaotic state, its working performance deteriorates. This paper proposes a novel nonlinear controller in the form of the cubic difference to eliminate the chaotic behavior in the Buck converter. This nonlinear controller is designed on basis of an idea that the cubic difference between the output voltage and the input voltage is multiplied by a feedback coefficient. Based on the state equations and the discrete mapping equations of the original Buck converter, it is confirmed that the chaotic phenomenon exists in the Buck converter. In terms of the controlled Buck converter model which can be obtained by introducing the nonlinear controller into the original Buck converter, the effectiveness of this controller is verified via analyzing the bifurcation diagrams with the feedback coefficient increasing, the inductor current waveform, the output voltage waveform, the Poincare section, the phase portrait and so on. Results show that without knowing the targeting orbit beforehand, this controller can transform the chaotic state of the Buck converter to the fixed point and the various periodic orbits by only adjusting one external parameter, that is, the feedback coefficient. The results of this paper provide a new thought for controlling chaotic phenomena in the power electronic circuits.

关键词： Chaos control Nonlinear controller Fixed point Periodic orbit Poincare section

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Nuclear Science and Techniques 2013年第5期24卷 44-49页

作者： KUMAR Sanjeev MA Yugang Amity Institute of Nuclear Science and technology Amity University Shanghai Institute of Applied Physics Chinese Academy of SciencesJiading Campus

By extending the minimum spanning tree(MST)clusterization algorithm for the binding energy cut,the isospin asymmetry dependence of directed flow for isospin sensitive isobar pairs(neutrons-protons,3H-3He) is studied from low towards high incident *** modified clusterization method(MSTB) has the advantage to identify the fragments at quite early *** enhances(reduces) the production of free nucleons(fragments) over MST *** directed flow of isobaric pair3H-3He is more sensitive towards isospin asymmetry caused by MSTB than isobaric pair *** sensitivity becomes quite strong towards the high incident energy and neutron-rich reaction *** conclusion,the inclusion of binding energy in clusterization method for the flow studies has been uniquely important for understanding the isospin physics,especially for high density behavior of symmetry energy.

关键词：集群化同位旋敏感性重离子碰撞流量算法修改入射能量

Extracellular synthesis of silver nanoparticles by Pseudomonas sp. THG-LS1.4 and their antimicrobial application

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Journal of Pharmaceutical Analysis 2018年第4期8卷 258-264页

作者： Hina Singh Juan Du Priyanka Singh Tae Hoo Yi Department of Oriental Medicine Biotechnology College of Life Science Kyung Hee University Global Campus College of Food and Bioengineering Zhengzhou University of Light Industry Henan Province Collaborative Innovation Center for Food Production and Safety

Silver nanoparticles（Ag NPs） are known to have bacteriostatic and bactericidal effects. The present study highlights the extracellular synthesis of Ag NPs and its antibacterial properties. The Ag NPs were synthesized using Pseudomonas sp. THG-LS1.4 strain which had been isolated from soil. The Ag NPs were characterized by field emission-transmission electron microscopy（FE-TEM）, X-ray diffraction（XRD）,Fourier transform-infrared（FT-IR） spectroscopy, and particle size distribution（DLS）. The Ag NPs displayed maximum absorbance at 412 nm and were irregular in shape ranging from 10 to 40 nm. The XRD spectroscopy results demonstrated the crystalline nature of nanoparticles. The Ag NPs showed antimicrobial activity against Bacillus cereus, Staphylococcus aureus, Candida tropicalis, Vibrio parahaemolyticus, Escherichia coli and Pseudomonas aeruginosa. Furthermore, the Ag NPs were also evaluated for their increased antibacterial activities with various antibiotics against Escherichia coli, Pseudomonas aeruginosa and Salmonella enterica. Additionally, Ag NPs showd biofilm inhibition activity. The biosynthesized Ag NPs were found to be a potent agent against tested pathogens. More importantly, we highlight the applications of Ag NPs as an antimicrobial agent.

关键词： Extracellular synthesis Silver nanoparticles Pseudomonas sp.THG-LS1.4 Antimicrobial activity

A lateral-immobilization zebrafish microfluidic chip-based system for in vivo real-time evaluation of antithrombotic agents

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Chinese Chemical Letters 2024年第3期35卷 312-315页

作者： Lijuan He Hongxia Du Yi Yang Zhihua Guan Jinjin Li Honglin Li Xudong Lin Lili Zhu Shanghai Key Laboratory of New Drug Design School of PharmacyEast China University of Science&TechnologyShanghai 200237China Guangdong Provincial Key Laboratory of Sensor technology and Biomedical Instrument School of Biomedical EngineeringShenzhen Campus of Sun Yat-sen UniversityShenzhen 518000China innovation Center for AI and Drug Discovery East China Normal UniversityShanghai 200062China

Thrombosis remains a major global health concern mainly characterized by high rates of morbidity and *** models serve as an indispensable tool to understand the underlying pathogenesis of thrombosis and assess the efficacy of novel antithrombotic ***,zebrafish has emerged as a valuable model organism for thrombosis ***,the traditional method of studying zebrafish thrombosis requires a laborious and time-consuming procedure,including anesthesia and manual immobilization of *** this study,based on hydrodynamic force,a lateral-immobilization zebrafish microfluidic chip(LIZMC)was designed to evaluate the cardiovascular system of multiple larvae within a single microscope field of ***,coupling with microscope imaging,real-time monitoring of the peripheral blood circulation in the tail of phenylhydrazine(PHZ)-induced zebrafish thrombosis was ***,the reliability of LIZMC for in vivo evaluation of antithrombotic agents in zebrafish was verified using ***,this novel LIZMC-based system can be used for in vivo zebrafish thrombosis studies and rapid screening of antithrombotic agents.

关键词： Microfluidic chip Zebrafish Thrombosis In vivo evaluation Real-time monitor

Modulating Myofibroblastic Differentiation of Fibroblasts through Actin-MRTF Signaling Axis by Micropatterned Surfaces for Suppressed Implant-Induced Fibrosis

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Research 2023年第3期6卷 609-618页

作者： Weiju Han Qi Chu Junliang Li Zixuan Dong Xuetao Shi Xiaoling Fu School of Materials Science and Engineering South China University of TechnologyGuangzhou 510006P.R.China National Engineering Research Center for Tissue Restoration and Reconstruction and innovation Center for Tissue Restoration and Reconstruction Guangzhou 510006P.R.China Laboratory of Biomedical Engineering of Guangdong Province South China University of TechnologyGuangzhou 510006P.R.China School of Biomedical Sciences and Engineering South China University of TechnologyGuangzhou International CampusGuangzhou 511442P.R.China

Myofibroblasts,the primary effector cells for implant-induced fibrosis,contribute to this process by secreting excessive collagen-rich matrix and ***,approaches that suppress myofibroblasts may achieve desirable suppression effects in the fibrotic *** one of the important physical properties of materials,material topographical structures have been proven to affect various aspects of cell behaviors,so is it possible to manipulate the formation of myofibroblasts by tailoring the topographical properties of medical devices?In this study,polycaprolactone(PCL)surfaces with typical micropatterns(micro column and micro pit)were *** regulatory effects of surface micropatterns on the myofibroblastic differentiation of fibroblasts were *** to the flat surfaces and surfaces with micro pit,surfaces with micro columns triggered the F-to G-actin transition,inhibiting the nuclear transfer of myocardin-related transcription ***,the downstream geneα-smooth muscle actin,which is a marker of myofibroblasts,was *** in vivo investigation showed that PCL implants with micro-column-patterned surfaces inhibited the formation of peri-implant fibrotic *** results demonstrate that surface topographical properties are a potent regulator of fibroblast differentiation into myofibroblasts and highlight the antifibrotic potential of modifying surfaces with micro-column patterns.

关键词： process column pressed

Heparinized PGA host-guest hydrogel loaded with paracrine products from electrically stimulated adipose-derived mesenchymal stem cells for enhanced wound repair

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Engineered Regeneration 2023年第3期4卷 225-237页

作者： Mengyao Li Junliang Li Xueru Xiong Yushi Wang Yong-Guang Jia Xuetao Shi Xiaoling Fu School of Materials Science and Engineering South China University of TechnologyGuangzhou 510641China School of Biomedical Sciences and Engineering South China University of TechnologyGuangzhou International CampusGuangzhou 511442China National Engineering Research Center for Tissue Restoration and Reconstruction and innovation Center for Tissue Restoration and Reconstruction Guangzhou 510006China Key Laboratory of Biomedical Engineering of Guangdong Province South China University of TechnologyGuangzhou 510006China

The microenvironment of the wound bed is essential in the regulation of wound *** this regard,strategies that provide a repairing favorable microenvironment may effectively improve healing ***,we attempted to use electrical stimulation(ES)to boost the paracrine function of adipose-derived stem cells from rats(rASCs).By examining the concentrations of two important growth factors,VEGF and PDGF-AA,in the cell culture supernatant,we found that ES,especially 5𝜇A ES,stimulated rASCs to produce more paracrine factors(5𝜇A-PFs).Further studies showed that ES may modulate the paracrine properties of rASCs by upregulating the levels of TRPV2 and TRPV3,thereby inducing intracellular Ca^(2+) *** deliver the PFs to the wound to effectively improve the wound microenvironment,we prepared a heparinized PGA host-guest hydrogel(PGA-Hp hydrogel).Moreover,PGA-Hp hydrogel loaded with 5𝜇A-PFs effectively accelerated the repair process of the full-thickness wound model in *** findings revealed the effects of ES on the paracrine properties of rASCs and highlighted the potential application of heparinized PGA host-guest hydrogels loaded with PFs derived from electrically stimulated rASCs in wound repair.

关键词： Wound repair Electrical stimulation Paracrine factors Heparinized PGA host-guest hydrogel