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Amino acid assisted aqueous synthesis of highly stable CsPbBr_(3)nanocrystals for cell imaging

Nano Research 2025年第1期18卷 675-683页

作者： Xue Li yanan guo guoying Tan Qingyi Liu Nan Song Yu Tang State Key Laboratory of Applied Organic Chemistry Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu ProvinceCollege of Chemistry and Chemical EngineeringLanzhou UniversityLanzhou 730000China State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization Baotou Research Institute of Rare EarthsBaotou 014030China

Lead halide perovskite nanocrystals(NCs)exhibit excellent optoelectronic performance and have drawn great interests in the fields of biological imaging and ***,the poor stability of CsPbX_(3)(X=Cl,Br,I)in water is still a challenge to hinder their practical *** this work,a facile strategy has been developed for aqueous synthesis of CsPbX_(3) nanocrystals,in which L-glutamic acid(LGlu)has been used to replace oleic acid in the synthetic *** from the synergic effects of L-Glu and oleylamine(OAm),CsPbBr_(3)nanocrystals(L-Glu/OAm-CsPbBr_(3)NCs)with high water stability have been directly prepared under a mild condition at room temperature in water,facilitated by the process of crystal phase transformation from Cs_(4)PbBr_(6) to CsPbBr_(3).L-Glu/OAm-CsPbBr_(3)NCs exhibit a high quantum yield of 85%and a narrow full width at half maximum of 16 nm,demonstrating their efficient luminescence in ***,L-Glu on the surface have contributed greatly to an acidic environment and passivation of surface defects,improving the water stability and dispersibility of CsPbBr_(3)***,L-Glu/OAm-CsPbBr_(3)NCs exhibit great biocompatibility due to the presence of L-Glu,resulting in their good performance for HeLa cell ***,we propose a facile and effective method to prepare CsPbBr_(3)nanocrystals with excellent water stability by using L-Glu and OAm as cooperated ligands and expand their application in cell imaging.

关键词： aqueous synthesis cell imaging lead halide perovskite nanocrystals L-glutamic acid phase transformation

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Solving nonlinear soliton equations using improved physics-informed neural networks with adaptive mechanisms

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Communications in Theoretical Physics 2023年第9期75卷 36-50页

作者： yanan guo Xiaoqun Cao Kecheng Peng Simulation and Training Center Naval Aviation UniversityHuludao 125001China College of Computer National University of Defense TechnologyChangsha 410073China College of Meteorology and Oceanography National University of Defense TechnologyChangsha 410073China

Partial differential equations(PDEs)are important tools for scientific research and are widely used in various ***,it is usually very difficult to obtain accurate analytical solutions of PDEs,and numerical methods to solve PDEs are often computationally intensive and very *** recent years,Physics Informed Neural Networks(PINNs)have been successfully applied to find numerical solutions of PDEs and have shown great *** the while,solitary waves have been of great interest to researchers in the field of nonlinear *** this paper,we perform numerical simulations of solitary wave solutions of several PDEs using improved *** improved PINNs not only incorporate constraints on the control equations to ensure the interpretability of the prediction results,which is important for physical field simulations,in addition,an adaptive activation function is *** introducing hyperparameters in the activation function to change the slope of the activation function to avoid the disappearance of the gradient,computing time is saved thereby speeding up *** this paper,the m Kd V equation,the improved Boussinesq equation,the Caudrey–Dodd–Gibbon–Sawada–Kotera equation and the p-g BKP equation are selected for study,and the errors of the simulation results are analyzed to assess the accuracy of the predicted solitary wave *** experimental results show that the improved PINNs are significantly better than the traditional PINNs with shorter training time but more accurate prediction *** improved PINNs improve the training speed by more than 1.5 times compared with the traditional PINNs,while maintaining the prediction error less than 10~(-2)in this order of magnitude.

关键词： physics-informed neural networks adaptive activation function partial differential equations solitary wave

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Mechanism of ethanol/water reverse separation through a functional graphene membrane:a molecular simulation investigation

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Frontiers of Chemical Science and Engineering 2023年第3期17卷 347-357页

作者： Quan Liu Xian Wang yanan guo Gongping Liu Kai-Ge Zhou School of Chemical Engineering Analytical and Testing CenterAnhui University of Science and TechnologyHuainan 232001China State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 211816China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China

Reverse-selective membranes have attracted considerable interest for bioethanol ***,to date,the reverse-separation performance of ethanol/water is poor and the separation mechanism is ***-based membranes with tunable apertures and functional groups have shown substantial potential for use in molecular *** molecular dynamics simulations,for the first time,we reveal twoway selectivity in ethanol/water separation through functional graphene *** graphene(PG)exhibits reverse-selective behavior with higher ethanol fluxes than water,resulting from the preferential adsorption for *** flow mappings show that this ethanol-permselective process is initiated by the presence of ethanol-enriched and water-barren pores;this has not been reported in previous *** contrast,water molecules are preferred for hydroxylated graphene membranes because of the synergistic effects of molecular sieving and functional-group attraction.A simulation of the operando condition shows that the PG membrane with an aperture size of 3.8Åachieves good separation performance,with an ethanol/water separation factor of 34 and a flux value of 69.3 kg∙m‒2∙h‒1∙bar‒*** study provides new insights into the reverse-selective mechanism of porous graphene membranes and a new avenue for efficient biofuel production.

关键词： reverse separation graphene membrane ethanol/water separation molecular simulation

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Two-dimensional MXene hollow fiber membrane for divalent ions exclusion from water

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Chinese Journal of Chemical Engineering 2022年第1期35卷 260-266页

作者： guozhen Liu yanan guo Baochun Meng Zhenggang Wang Gongping Liu Wanqin Jin State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 211816China

Two-dimensional material membranes with fast transport channels and versatile chemical functionality are promising for molecular ***,for the first time,we reported design and engineering of two-dimensional Ti_(3)C_(2)Tx MXene(called transition metal carbides and nitrides)membranes supported on asymmetric polymeric hollow fiber substrate for water *** membrane morphology,physicochemical properties and ions exclusion performance were systematically *** results demonstrated that surface hydrophilicity and electrostatic repulsion and size sieving effect of interlayer channels synergistically endowed the MXene hollow fiber membrane with fast water permeation and efficient rejection of divalent ions during nanofiltration process.

关键词： Two-dimensional material MXene membranes Hollow fiber Desalination Nanofiltration

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Effects of LiAl-Layered Double Hydroxides on Early Hydration of Calcium Sulphoaluminate Cement Paste

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Journal of Wuhan University of Technology(Materials Science) 2017年第5期32卷 1101-1107页

作者：李海艳管学茂 YANG Lei LIU Songhui ZHANG Jianwu guo yanan School of Material Science and Engineering Henan Polytechnic University Jiaozuo 454000 China

As a 3D micro-nano material, layered double hydroxides have been widely used in many fields, especially for reinforced composite materials. In this paper, Li Al-LDHs was obtained by a hydrothermal method. In order to investigate the effects of Li Al-LDHs on the early hydration of calcium sulphoaluminate（CSA） cement paste, compressive strength, setting time and hydration heat were tested while X-ray diffraction（XRD）, Fourier transform infrared spectroscopy（FT-IR）, scaning electron microscopy（SEM） and differential scanning calorimetry（DSC） analysis were employed. The results indicated that Li Al-LDHs could significantly improve the early compressive strength and shorten the setting time of calcium sulphoaluminate cement paste with 3 wt% concentration. Besides, the hydration exothermic rate within 5h was accelerated with increasing Li Al-LDHs content. Moreover, the addition of Li Al-LDHs did not result in the formation of a new phase, but increased the quantity of hydration products providing higher compressive strength, shorter setting time and denser microstructure.

关键词： LiAl-layered double hydroxides calcium sulphoaluminate cement paste hydration compressive strength setting time

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Loss of the ubiquitin-conjugating enzyme Rad6B disturbs mitochondrial function and cellular homeostasis in mouse skin

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BIOCELL 2021年第3期45卷 761-772页

作者： LINGHUI YU RONG SHEN yanan guo YANXUAN guo CHEN LI YANFENG SONG DEGUI WANG Department of Anatomy and Histology School of Basic Medical SciencesLanzhou UniversityLanzhou730000China

Various factors can induce cell degeneration by altering the phenotype and metabolism of *** play an essential role in cellular homeostasis and function,rendering aging processes highly associated with mitochondrial function and ***,we describe an aging-prone phenotype of murine skin cells caused by depletion of Rad6B(Ube2b),an E2 ubiquitin-conjugating *** this study,using Masson’s trichrome,we showed that loss of Rad6B causes physiological structure changes in mouse skin with *** addition,a combination of western blotting experiments,transmission electron microscopy and employment of immunofluorescence staining revealed that depletion of Rad6B was characterized by an abnormal mitochondrial metabolic profile,including decreased mitochondrial biosynthesis and mitochondrial complex activities,increased ROS production and suppressed mitophagy resulting in metabolic *** together,these results highlight an important relationship between Rad6B and skin senescence,suggesting that Rad6B plays an indispensable role in maintaining a healthy mitochondrial network and intracellular homeostasis.

关键词： Rad6B Skin Mitochondria Respiratory chain Senescence

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Polyaniline-based electrocatalysts through emulsion polymerization:Electrochemical and electrocatalytic performances

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Journal of Energy Chemistry 2017年第1期26卷 182-192页

作者： Shehnaz Xuedan Song Suzhen Ren Ying Yang yanan guo Hongyu Jing Qing Mao Ce Hao State Key Laboratory of Fine Chemicals Dalian University of TechnologyDalian 116024LiaoningChina College of Chemical Engineering Dalian University of TechnologyDalian 116024LiaoningChina

One of the major challenges associated with fuel cells is the design of highly efficient electrocatalysts to reduce the high overpotential of the oxygen reduction reaction (ORR). Here we report Polyaniline (PANI) based micro/nanomaterials with or without transition metals, prepared by the emulsion polymerization and subsequent heat treatment. PANI microspheres with the diameter of about 0.7 mu m have been prepared in basic (NH3 solution) condition, using two different types of surfactant (CTAB, SDS) as the stabilizer, ammonium persulphate (APS) as oxidant with aniline/surfactants molar ratio at 1/1 under the hydrothermal treatment. PANI nanorods, Fe-PANI, and Fe-Co-PANI have been synthesized in acidic (HCI) medium with aniline/surfactants molar ratio at 1/2 and polymerization carried out without stirring for 24 h. Products mainly Fe-Co-PANI have shown high current density with increasing sweep rate and excellent specific capacitance 1753 F/g at the scan rate of 1 mV/s. Additionally, it has shown high thermal stability by thermogravimetric analysis (TGA). Fe-PANI has been investigated for excellent performance toward ORR with four electron selectivity in the basic electrolyte. The PANI-based catalysts from emulsion polymerization demonstrate that the method is valuable for making non-precious metal heterogeneous electrocatalysts for ORR or energy storage and conversion technology. (C) 2016 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.

关键词： Emulsion polymerization Interfacial conductivity Fe-Co-PANI Non-precious metal electrocatalyst Oxygen reduction reaction

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Ultraviolet communication technique and its application

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Journal of Semiconductors 2021年第8期42卷 32-44页

作者： Liang guo yanan guo Junxi Wang Tongbo Wei Research and Development Center for Semiconductor Lighting Technology Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Beijing Engineering Research Center for the 3rd Generation Semiconductor Materials and Application Beijing 100083China

With recent developments of deep ultraviolet(DUV)light-emitting diodes and solar-blind detectors,UV communication(UVC)shows great potential in replacing traditional wireless communication in more and more *** on the atmospheric scattering of UV radiation,UVC has gained considerable attention due to its non-line-of-sight ability,omnidirectional communication links and low background *** advantages make UVC an ideal option for covert secure communication,especially for military *** this review,we present the history and working principle of UVC with a special focus on its light sources and *** comparison and application of its light sources and detectors are provided to the best of our *** further discuss the future application and outlook of ***,this review will offer valuable insights into the future development of UVC.

关键词： ultraviolet communication non-line-of-sight optical wireless communication

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Impact of intensity variability of the Asian summer monsoon anticyclone on the chemical distribution in the upper troposphere and lower stratosphere

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Atmospheric and Oceanic Science Letters 2022年第3期15卷 25-30页

作者： Kecheng Peng Jiali Luo Jiayi Mu Xiaoqun Cao Hongying Tian Lin Shang yanan guo College of Meteorology and Oceanography National University of Defense TechnologyChangshaChina Key Laboratory of Semi-Arid Climate Change and College of Atmospheric Sciences Lanzhou UniversityLanzhouChina College of Computer National University of Defense TechnologyChangshaChina Shandong Provincial Climate Center JinanChina Trainer Simulation Training Center of Naval Aeronautical University HuludaoChina

During the Asian summer monsoon(ASM)season,the process of stratosphere-troposphere exchange significantly affects the concentration and spatial distribution of chemical constituents in the upper troposphere and lower stratosphere(UTLS).However,the effect of the intensity of the Asian summer monsoon anticyclone(ASMA)on the horizontal distribution of chemical species within and around the ASMA,especially on the daily time scale,remains ***,the authors use the MERRA-2 reanalysis dataset and Aura Microwave Limb Sounder observations to study the impact of ASMA intensity on chemical distributions at 100 hPa during the ASM *** intraseasonal variation of ASMA is classified into a strong period(SP)and weak period(WP),which refer to the periods when the intensity of ASMA remains strong and weak,*** relatively low ozone(O_(3))region is found to be larger at 100 hPa during SPs,while its mixing ratio is lower than during WPs in *** June,analysis shows that the O_(3) horizontal distribution is mainly related to the intensity of AMSA,especially during SPs in June,while deep convections also impact the O_(3) horizontal distribution in July and *** results indicate that the intraseasonal variation of the ASMA intensity coupled to deep convection can significantly affect the chemical distribution in the UTLS region during the ASM season.

关键词： Asian summer monsoon anticyclone Intensity index Chemical distribution Deep convection

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A review of spatial targeting methods of payment for ecosystem services

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Geography and Sustainability 2020年第2期1卷 132-140页

作者： yanan guo Hua Zheng Tong Wu Jian Wu Brian E.Robinson State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental SciencesChinese Academy of ScienceBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China School of Environment and Natural Resources Renmin University of ChinaBeijing 100872China Department of Geography McGill UniversityMontreal QC H3A 0B9Canada

Payments for Ecosystem Services(PES)have been studied extensively over the past decade as an important policy tool for coordinating ecological protection and regional socioeconomic *** of the greatest challenges of PES implementation is to understand where to pay,i.e.,spatial targeting,which can directly impact PES effectiveness and *** this study,we conducted a systematic review of spatial targeting methods based on literature analysis using ***,peer-reviewed articles related to spatial targeting of PES were selected from the Web of Science database based on *** applying PES spatial targeting methods were then chosen and analyzed after all articles were *** total,70%of the chosen cases focused on improving the compensation efficiency of biodiversity or another single environmental objective,whereas the remaining cases focused on coordinating trade-offs between equity and efficiency or multiple environmental *** main PES spatial targeting approaches included cost-benefit analysis,multi-objective optimization,data envelope analysis and other methods aimed at specific *** these,cost-benefit analysis has been most widely applied at different scales,including county,regional and watershed *** differences among the different PES spatial targeting methods were found,including in PES spatial targeting dimensions,efficiency optimization approaches and method application *** practice of PES spatial targeting requires the selection of appropriate methods based on contextual biophysical and socioeconomic conditions as well as relevant environmental *** combined application of PES spatial targeting methods,compensation willingness of stakeholders and dynamic implementation of PES spatial targeting should be considered in future research.

关键词： Payment for ecosystem services Spatial targeting Efficiency Cost-benefit analysis Multi-objective optimization Data envelopment analysis

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