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Bioactivated in vivo assembly(BIVA)peptide-tetraphenylethylene(TPE)probe with controllable assembled nanostructure for cell imaging

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Chinese Chemical Letters 2021年第6期32卷 1947-1952页

作者： Shizhao Lu Xiaoyan Guo Fangling Zhang xiaodong li Meishuai Zou li-li li School of Material Science and Engineering Beijing Institute of TechnologyBeijing 100081China CAS Center for Excellence in Nanoscience CAS Key Laboratory for Biomedical Effects of Nanomaterials and NanosafetyNational Center for Nanoscience and Technology(NCNST)University of Chinese Academy of SciencesBeijing 100190China

The emergence of fluorescent light-up molecular probe,which can specifically turn on their fluorescent in the presence of stimulation factors,has open up a new opportunity to advance biosensing and *** this work,we designed and synthesized a peptide-AIE conjugate probe for cell imaging with controlled in situ assembled *** modular designed probe is consisted of a selfassembled peptide-tetraphenylethene(TPE)motif,a fibroblast activation protein alpha(FAP-α)responsive motif,a hydrophilic motif and a targeting *** probe exhibits typically turn-on fluorescence property specifically triggered by FAP-α,which is a significant overexpressed membrane protein on pancreatic tumor ***,the peptide modified the TPE dramatically impacts the assembled nanostructure,which can be modulated by peptide *** a result,the peptide FF(PhePhe)modification of TPE as the self-assembled motif provides a suitable balance of the probe with lightup property and nanofiber assembled structure in ***,our probe could effectively detect the FAP-αon tumor cells with high ***,the nanofibers in situ assembled on the surface of CAFs enhanced the probe accumulation and prolonged the retention for cell *** envision that this study may inspire new insights into the design of nanostructure controlled AIE light-up bio-probe.

关键词： Peptide Self-assembly Tetraphenylethene(TPE) AIE Cell imaging

Real-time modular dynamic modeling for compression system of altitude ground test facilities

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Chinese Journal of Aeronautics 2023年第5期36卷 202-211页

作者： Yang SU Xuejiang CHEN Xin WANG xiaodong li Xiaoming liU School of Energy and Power Engineering Xi’an Jiaotong UniversityXi’an 710049China AECC Sichuan Gas Turbine Establishment Mianyang 621703China State Key Laboratory of Compressor Technology(Compressor Technology Laboratory of Anhui Province) Hefei 230031China

Modeling of a centrifugal compressor is of great significance to surge characteristics and fluid dynamics in the Altitude Ground Test Facilities(AGTF).Real-time Modular Dynamic System Greitzer(MDSG)modeling for dynamic response and simulation of the compression system is *** centrifugal compressor,pipeline network,and valve are divided into pressure output type and mass flow output type for module modeling,and the two types of components alternate when the system is *** pressure loss and thermodynamics of the system are *** air supply compression system of AGTF is modeled and simulated by the MDSG *** simulation results of mass flow,pressure,and temperature are compared with the experimental results,and the error is less than 5%,which demonstrates the reliability,practicability,and universality of the MDSG model.

关键词： Altitude Ground Test Facilities(AGTF) Compression modeling Dynamic simulation Real-time modelling Modular Dynamic System Greitzer(MDSG)modeling

Preparation and characterization of core-shell Al@PFHP with improving the combustion and ignition properties of aluminum powder

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Particuology 2023年第6期77卷 62-70页

作者： lichen Zhang Shuo Wang Xing Su xiaodong li Meishuai Zou School of Materials Science and Engineering Beijing Institute of TechnologyBeijing100081China

The dense alumina shell on the surface of aluminum powder will hinder the combustion of aluminum powder and increase its ignition *** this study,the aluminum oxide shell layer on the surface of aluminum powder was removed with hydrofluoric acid by one-pot method,and 3-Perfluorohexyl-1,2-epoxypropane(PFHP)(F3C(CF2)5CH2C2H3O)was coated to form a uniform and controllable core-shell Al@*** core-shell AI@PFHP showed better thermal reaction and ignition *** exothermic enthalpy of Al@0.15 PFHP was increased by about 1.9 times,with lower ignition temperature(reduced by about 140℃)and longer burning duration(increased by about 1.5 times)after coating with PFHP,compared with raw aluminum *** addition,the formation of PFHP coating shell can effectively improve the hydrophobicity and corrosion resistance of aluminum powder.

关键词： Aluminumpowder Core-shell 3-Perfluorohexyl-1 2-Epoxypropane Combustion

Analysis of the Pyrolysis of Solid Recovered Fuel and Its Sorted Components by using TG-FTIR and DAEM

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Journal of Thermal Science 2023年第4期32卷 1671-1683页

作者： WU Lei JIANG Xuguang LV Guojun li xiaodong YAN Jianhua State Key Laboratory of Clean Energy Utilization Institute for Thermal Power EngineeringZhejiang UniversityHangzhou310027China

Currently,waste disposal has been highlighted strategically all over the *** recovered fuel(SRF)with a high calorific value is manufactured from municipal solid waste(MSW).Thermogravimetric Fourier transform infrared spectroscopy(TG-FTIR)and distributed activation energy model(DAEM)were utilized to study the pyrolysis of the individual components and their mixture(***),which were obtained from a MSW incineration power *** best operating conditions were defined by comparing the effect of heating rates and flow rates of sweep *** gaseous products and functional groups in the pyrolysis of each component and their mixture were ***,a direct search method was presented to obtain the DAEM kinetic *** equations for volatile products were given to describe pyrolysis of *** model prediction results are consistent with the experimental *** kinetic data will provide a basis for gas composition regulation from theoretical modeling.

关键词： solid recovered fuel pyrolysis TG-FTIR DAEM

Aerosol pollution in a megacity of southwest China inferred from variation characteristics of sulfate-δ^34S and water-soluble inorganic compositions in TSP

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Particuology 2019年第2期17卷 202-209页

作者： Zhou Yang xiaodong li Shilu Wang Qinkai li Jun Huang Gaoyang Cui Department of Tourism and Geography Tongren University Tongren 554300 China Institute of Surface-Earth System Sciences Tianjin University Tianjin 300072 China State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guizhou 550081 China

Daytime and nighttime aerosol samples for total suspended particles (TSP) were collected in Chengdu from 12 to 23 January 2013 (winter) and 10 to 21 August 2014 (summer). The mass concentrations of TSP, major inorganic ions, and stable sulfur isotope ratios were determined. Clear winter-summer variatio n inT SPwas observed;the mass concentrations ofTSPin summerwere below levels defi ned by the Chinese National Ambient Air Quality Standard (GB3095-2012), whereas winter TSP levels exceeded the standard by 2-4 times. Overall, the sum of SO4^2-, NO3^-, and NH4^+ concentmtions represented the highest contribution to water-soluble ionic components, which showed similar trends to TSP mass. According to correlations among major ions, the major compounds in TSP were likely to be (NH4)2SO4, NH4NO3, CaCl2,and KCl in both sampling times, and CaSO4 and Ca(NO3)2 were also present in summer. The NO3 /SO42^- ratios ranged from 0.57 to 1.28 (average 0.85 ± 0.16) in winter and 0.5 to 0.93 (average 0.66 ±0.11) in summer, indicating stationary source ernissi ons (coal bur ning) were more im porta nt sources than the vehicle exhaust. The relationship between SO4^2- and δ^34S indicated the sulfate sources were affected by the low sulfur isotope value of biogenic sulfur release in summer, and the high sulfur isotope value of coal in winter. As a whole, the mixture of coal burning and vehicle exhaust represent the major TSP sources in Chengdu in the study period, and biogenic sulfur also contributes to TSP in summer.

关键词： Aerosol pollution Variation characteristics Sulfate-δ^34S Total suspended particle

Thermal Kinetics and Decomposition Mechanism of 1-Amino-1,2,3-triazolium Nitrate

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Chemical Research in Chinese Universities 2014年第1期30卷 130-136页

作者： DU Xujie li xiaodong YANG Rongjie li Yuchuan PANG Siping School of Materials Science and Engineering Beijing Institute of Technology Beijing 100081 P. R. China

The thermal decomposition kinetics of 1-amino-l,2,3-triazolium nitrate（ATZ-NO3） was investigated by non-isothermal TG-DTG at various heating rates（2,5,10,15 and 20 ℃/min）.The results show that the thermal decomposition of ATZ-NO3 consists of two stages corresponding to the losing of nitrate anion,substituent group and the splitting of triazole ring *** kinetic triplets of the two stages were described by a three-step ***,the differential Kissinger and intergral Ozawa methods were used to calculate the apparent activation energies（E） and pre-exponential factors（A） of the two decomposition ***,two calculation methods（intergral （S）atava-（S）esták and differential Achar methods） were used to obtain several probable decomposition mechanism ***,three judgment methods（average,double-extrapolation and Popescu methods） were used to confirm the most probable decomposition mechanism *** reaction models of the two stages were randominto-nucleation and random-growth mechanisms with n=3/2 for the first stage and n=1/3,m=3 for the second *** kinetic equations for the two decomposition stages of ATZ-NO3 may be expressed as da/dt=1013.60·e-128970/RT（1-α）[-1n（1-α）]-1/2 and da/dt=1011.41·e-117370/RT（1-α）[-1n（1-α）]-2/*** thermodynamic parameters including Gibbs free energy of activation（△G≠）,entropy of activation（△S≠） and enthalpy of activation（△H≠）,for the thermal decomposition reaction were also derived.

关键词： 1-Amino-1,2,3-triazolium nitrate Thermal decomposition Thermal gravimetric analysis Non-isothermal kinetics Gibbs free energy of activation(△G≠) Kinetic triplets Compensation effect

Jet Noise Reduction of Double-Mixing Exhaust System

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Transactions of Nanjing University of Aeronautics and Astronautics 2016年第2期33卷 129-136页

作者： Shao Wanren Wu Fei He Jingyu li xiaodong Shenyang Engine Design and Research Institute Aviation Industry Corporation of China Shenyang 110015 P.R. China China Academy of Aerospace Aerodynamics Beijing 100074 P.R. China School of Energy and Power Engineering Beihang University Beijing 100191 P.R. China

A jet noise reduction technique by using the external chevron nozzle with lobed mixer in the double-mixing exhaust system is investigated under cold *** computations of jet field and the experiments of noise field are conducted with scaled model of high-bypass-ratio turbofan engine mixing exhaust system composed of external chevron nozzle with lobed *** computational results indicate that comparing with the baseline nozzle with lobed mixer,the external chevron nozzle with lobed mixer increases mixing of jet and ambient air near the nozzle *** experimental results show that the external chevron nozzle with lobed mixer has better jet noise reduction at low frequencies,and this reduction rises with the increase of chevron bend *** experimental results also show that the external chevron nozzle with lobed mixer has sound pressure level(SPL)increase which is not obvious at high *** chevron bend angle increasing,SPL has relatively marked increase at 60°(directivity angle measured from upstream jet axis)and little fluctuations at 90°and 150°.The external chevron nozzle with lobed mixer has overall sound pressure level(OASPL)reduction in varying degrees at 60°and 150°,but it has little OASPL increase at 90°.

关键词： aerospace propulsion system high-bypass-ratio turbofan engine mixing exhaust system lobed mixer chevron nozzle jet noise reduction

Preparation of an environmentally friendly emulsion-type lubricant based on crude rice bran wax

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Petroleum 2019年第1期5卷 77-84页

作者： Zhengqiang Xiong Fan Fu xiaodong li Yanning li Beijing Institute of Exploration Engineering Beijing100083China

In this study,crude rice bran wax oil-in-water emulsion(named CRBWE)was prepared by agent-in-water *** critical factors influencing the sample preparation process were *** instance,the optimum hydrophile-lipophile balance value of compound emulsifier was 12.33–13.40,the content of compound emulsifier was 10 wt%,the emulsification temperature was 70°C–80°C,the agitation speed was 200 rpm,and the emulsification time was 30–45 *** performances as a lubricant of drilling fluid were also evaluated with respect to lubricity,rheology and filtration loss of *** results showed that CRBWE had good lubricity and didn't affect the rheological properties of drilling *** example,when it was added into bentonite dispersion at room temperature with the fraction of 1 wt%,the coefficient of friction of bentonite dispersion dramatically decreased to 0.077,and the coefficient of friction reduced rate was greater than 80%.Overall,these findings indicated that CRBWE would have promising applications as environmental friendly lubricant of drilling fluids to reduce torque and drag in petroleum and natural gas drilling.

关键词： Emulsion-type lubricant Crude rice bran wax Lubricity Biodegradable Water-based drilling fluids

Porous CoF2 Spheres Synthesized by a One-Pot Solvothermal Method as High Capacity Cathode Materials for lithium-Ion Batteries

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Chinese Journal of Chemistry 2017年第1期35卷 48-54页

作者： Qun Guan Jianli Cheng xiaodong li Bin Wang Institute of Chemical Materials China Academy of Engineering Physics Mianyang Sichuan 621900 China Sichuan R &D Center of New Materials Mianyang Sichuan 621900 China

Up to now, there are rare reports of CoF2 spheres used as high capacity cathode materials. Herein, porous CoF2 spheres were synthesized and studied as cathode materials for liBs. The porous CoF2 spheres were synthesized by a facile one-pot solvothermal method using a safe and inexpensive ammonium fluoride as the fluorine sources. The nature of the synthesis can avoid using corrosive fluorine sources and additional high-temperature thermal treatment The structure, morphologies and electrochemical performance of the samples obtained at different reaction times and solvothermal temperatures were investigated. The results show that the CoF2 spheres obtained at 200 ℃ for 20 h show better electrochemical performances, including a high initial discharge capacity, good capacity retention and high Coulombic efficiency. It can deliver a high initial discharge capacity of 537.8 mAoh·g-1 and keep 127.4 mA·h.g- 1 after 30 cycles used as cathode materials for lithium-ion batteries. The good electrochemical performances may be attributed to good crystallinity, porous structure and relatively intermediate sphere size.

关键词： CoF2 sphere solvothermal method cathode materials lithium-ion battery