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Calcium-Doped Boron Nitride Aerogel Enables Infrared Stealth at High Temperature Up to 1300℃

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Nano-Micro Letters 2022年第1期14卷 295-306页

作者： Mengya Zhu guangyong li Wenbin Gong lifeng Yan Xuetong Zhang School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026People’s Republic of China Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of SciencesSuzhou 215123People’s Republic of China School of Physics and Energy Xuzhou University of TechnologyXuzhou 221018People’s Republic of China School of Chemistry and Materials Science University of Science and Technology of ChinaHefei 230026People’s Republic of China Division of Surgery&Interventional Science University College LondonLondon NW32PFUK

Boron nitride(BN)aerogels,composed of nanoscale BN building units together with plenty of air in between these nanoscale building units,are ultralight ceramic materials with excellent thermal/electrical insulation,great chemical stability and high-temperature oxidation resistance,which offer considerable advantages for various applications under extreme ***,previous BN aerogels cannot resist high temperature above 900℃ in air atmosphere,and hightemperature oxidation resistance enhancement for BN aerogels is still a great ***,a calcium-doped BN(Ca-BN)aerogel with enhanced high-temperature stability(up to~1300℃ in air)was synthesized by introducing Ca atoms into crystal structure of BN building blocks via high-temperature reaction between calcium phosphate and melamine diborate *** Ca-BN aerogels could resist the burning of butane flame(~1300℃)and keep their megashape and microstructure very ***,Ca-BN aerogel serves as thermal insulation layer,together with Al foil serving as both low-infrared-emission layer and high-infrared-reflection layer,forming a combination structure that can effectively hide high-temperature target(heated by butane flame).Such successful chemical doping of metal element into crystal structure of BN may be helpful in the future design and fabrication of advanced BN aerogel materials,and further extending their possible applications to extremely high-temperature environments.

关键词： Aerogel Boron nitride Calcium doping Infrared stealthy Butane flame

Evaporative enrichment of stable isotopes(δ^(18)O and δD) in lake water and the relation to lake-level change of Lake Qinghai, Northeast Tibetan Plateau of China

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Journal of Arid Land 2015年第5期7卷 623-635页

作者： WU Huawu li Xiaoyan li Jing JIANG Zhiyun li guangyong liU Lei State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal University College of Resources Science and Technology Beijing Normal University Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences University of Chinese Academy of Sciences

Stable isotopic compositions （δ18O and 6D） have been utilized as a useful indicator for evaluating the current and historical climatic and environmental changes. Therefore, it is vital to understand the relationship be- tween the stable isotopic contents in lake water and the variations of lake level, particularly in Lake Qinghai, China. In this study, we analyzed the variations of isotope compositions （δ18O, 6D and d-excess） in lake water and pre- cipitation by using the samples that were collected from Lake Qinghai region during the period from 2009 to 2012. The results showed that the average isotopic contents of δ18O and 6D in lake water were higher than those in pre- cipitation, which were contrary to the variations of d-excess. The linear regression correlations between δ18O and 6D in lake water and precipitation showed that the local evaporative line （LEL） in lake water （δD=5.88δ18O-2.41） deviated significantly from the local meteoric water line （LMWL）in precipitation （δD=8.26δ18O＋16.91）, indicating that evaporative enrichment had a significant impact on isotopic contents in lake water. Moreover, we also quanti- fied the Eli ratio （evaporation-to-input ratio） in Lake Qinghai based on the lake water isotopic enrichment model derived from the Rayleigh equation. The changes of E/I ratios （ranging from 0.29 to 0.36 between 2009 and 2012） clearly revealed the shifts of lake levels in Lake Qinghai in recent years. The average E/I ratio of 0.40 reflected that water budget in Lake Qinghai was positive, and consistent with the rising lake levels and the increasing lake areas in many lakes of the Tibetan Plateau. These findings provide some evidences for studying the hydrological balance or water budget by using δ18O values of lake sedimentary materials and contribute to the reconstruction of paleo- lake water level and paleoclimate from an isotopic enrichment model in Lake Qinghai.

关键词： stable isotopes d-excess lake level E/I ratio isotopic enrichment model paleoclimate

Proteomic analysis of the gene DR1709 mutant in Deinococcus radiodurans

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Nuclear Science and Techniques 2009年第6期20卷 331-334页

作者： TIAN Shuangqi QIN guangyong li Yongliang CHANG Shenghe Ion Beam Bio-engineering Lab School of Physics ~engzhou University Zhengzhou 450052 China

DR1709 is a predicted Mn2+ transporter in Deinococcus radiodurans(***). The mensuration method to evaluate protein viability with two-dimensional electrophoresis in *** and the mutants was established in this study. The results showed that after DR1709 was disrupted, the expressions of DR1120 (acetokinase), DR1691 (heat shock protein), DR1485 (putative lipase), DR2095 (putative c-type cytochrome) and other three hypothetical proteins (DR0124, DR0047 and DR2474) were repressed. However the expression of DR1794 (putative nosX) was induced. Phenomena above suggested that the increased radiation-sensitivity of the mutant cells may be attributed to not only the protection of gene DR1709, but also the proteins' different expressions between the wild type and the mutant might also play important roles in protecting *** from irradiation. Although DR2095 was a homologue of c-type cytochrome, it has no realitic functions.

关键词：基因突变体耐辐射球菌蛋白质组学分细胞色素热休克蛋白双向电泳测定方法

Nano-frictional mechano-reinforcing porous nanowires scaffolds

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Friction 2024年第5期12卷 968-980页

作者： licheng HUA Conghu HU Jingkang ZHANG Jin li Chenjie GU Bin HUANG guangyong li Jianke DU Wanlin GUO Smart Materials and Advanced Structures Laboratory School of Mechanical Engineering&MechanicsNingbo UniversityNingbo315211China Key Laboratory for Intelligent Nano Materials and Devices of Ministry of Education Nanjing University of Aeronautics and AstronauticsNanjing210016China Key Laboratory of Impact and Safety Engineering Ministry of EducationSchool of mechanical Engineering and MechanicsNingbo UniversityNingbo315211China Department of Microelectronics and Engineering Ningbo UniversityNingbo315211China

Artificial biomaterials with dynamic mechano-responsive behaviors similar to those of biological tissues have been drawing great *** this study,we report a TiO_(2)-based nanowire(TiO_(2)NWs)scaffolds,which exhibit dynamic mechano-responsive behaviors varying with the number and amplitude of nano-deformation *** is found that the elastic and adhesive forces in the TiO_(2)NWs scaffolds can increase significantly after multiple cycles of *** nanofriction experiments show the triboelectric effect of increasing elastic and adhesive forces during the nano-deformation cycles of TiO_(2)NWs *** properties allow the TiO_(2)NW scaffolds to be designed and applied as intelligent artificial biomaterials to simulate biological tissues in the future.

关键词： TiO_(2)NWs scaffolds nano-deformation mechano-reinforcing triboelectric effect intelligent artificial biomaterials

Spatial pattern and mechanisms of farmland abandonment in Agricultural and Pastoral Areas of Qingzang Plateau

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Geography and Sustainability 2021年第3期2卷 139-150页

作者： Yuling li Tao Zhou Guanghui Jiang guangyong li Dingyang Zhou Yu Luo State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal UniversityBeijing 100875China School of Natural Resources Faculty of Geographical ScienceBeijing Normal UniversityBeijing 100875China National Geomatics Center of China Beijing 100830China

With the rapid development of social economy and urban−rural integration,the phenomenon of farmland aban-donment worldwide has proved to be one of the main trends of land use and land cover change(LUCC),and profoundly affected the rural landscape and regional ecological *** by the natural environ-ment,economic development and backward agricultural technology,the phenomenon of farmland abandonment is also common in the Qingzang Plateau(QP).Therefore,this paper adopted the spatial autocorrelation method to analyze the spatial pattern of abandonment in the agricultural and pastoral areas of the Qingzang Plateau(APA−QP)in 2017,and the geographically weighted regression(GWR)model to explore the effects of geograph-ical resources,socio-economic development and location conditions on farmland *** study found that:1)From 2015 to 2017,the abandoned farmland area in the APA−QP was approximately 18.23×10^(4)ha,with an overall abandonment rate of 15.18%.On the whole,it showed the distribution characteristics of“strong in the south and weak in the north,strong in the east and weak in the west”.2)There were positive spatial correlation between both abandoned area and abandonment rate in the APA−QP,showing“concave”and“convex”patterns,respectively,mainly concentrated in the Huang−shui Valley and the Southeast Tibet;while in the western and northern regions,the degree of abandonment was relatively low.3)Farmland abandonment in the APA−QP was mainly driven by the geographical environment changes and farmers’decision−making on farmland *** was significant spatial heterogeneity on farmland abandonment associated with the impact of geographical resources,socio−economics and location *** geographical resource factors had a positive impact on the abandonment,and were strongly constrained by natural geographic conditions such as altitude and *** farmland resources in the Qingzang Plateau are limited,but are of strategic signifi

关键词： Farmland abandonment Spatial pattern Formation mechanism Geographically weighted regression Qingzang Plateau,Agricultural and pastoral areas

Detecting CD20-Rituximab specific interactions on lymphoma cells using atomic force microscopy

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Science China(life Sciences) 2010年第10期53卷 1189-1195页

作者： li Mi liU lianQing XI Ning WANG YueChao DONG Zaili li guangyong XIAO XiuBin ZHANG WeiJing State Key Laboratory of Robotics Shenyang Institute of AutomationChinese Academy of SciencesShenyang 110016China Department of Electrical and Computer Engineering Michigan State UniversityEast Lansing 48824USA Department of Electrical and Computer Engineering University of PittsburghPittsburgh 15261USA Department of Lymphoma Affiliated Hospital of Military Medical Academy of Sciences Beijing 100071China Graduate University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Drug Research Shanghai Institute of Materia MedicaChinese Academy of SciencesShanghai 201203China

Elucidating the underlying mechanisms of cell physiology is currently an important research topic in life sciences. Atomic force microscopy methods can be used to investigate these molecular mechanisms. In this study, single-molecule force spectroscopy was used to explore the specific recognition between the CD20 antigen and anti-CD20 antibody Rituximab on B lymphoma cells under near-physiological conditions. The CD20-Rituximab specific binding force was measured through tip functionalization. Distribution of CD20 on the B lymphoma cells was visualized three-dimensionally. In addition, the relationship between the intramolecular force and the molecular extension of the CD20-Rituximab complex was analyzed under an external force. These results facilitate further investigation of the mechanism of Rituximab’s anti-cancer effect.

关键词： atomic force microscopy single-molecule force spectroscopy CD20 antigen Rituximab

Effects of biochar on water movement characteristics in sandy soil under drip irrigation

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Journal of Arid Land 2019年第5期11卷 740-753页

作者： PU Shenghai li guangyong TANG Guangmu ZHANG Yunshu XU Wanli liPan FENG Guangping DING Feng College of Water Resources and Civil Engineering China Agriculture UniversityBeijing 100083China Institute of Soil Fertilizer and Agricultural Water Saving Xinjiang Academy of Agricultural SciencesUrumqi 830091China Key Laboratory of Northwest Oasis Agricultural Environment Ministry of Agriculture of ChinaUrumqi 830091China

Biochar addition can improve the physical and hydraulic characteristics of sandy *** study investigated the effects of biochar on water holding capacity and water movement in sandy soil under drip *** indoor simulation experiments,the effects of biochar application at five levels(0%,1%,2%,4%and 6%)on the soil water retention curve,infiltration characteristics of drip irrigation and water distribution were tested and *** results showed that biochar addition rate was positively correlated with water holding capacity of sandy soil and soil available *** the same infiltration time,with an increasing amount of added biochar,the diffusion distance of the horizontal wetting front(HWF)tended to decrease,while the infiltration distance of vertical wetting front(VWF)initially declined and then *** features of wetted bodies changed from"broad-shallow"to"narrow-deep"*** relationship between the transport distances of HWF and VWF and the infiltration time was described by a power *** the same distance from the point source,the larger the amount of added biochar,the higher the soil water *** had a great influence on the water content of the layer with biochar(0–200 mm)and had some effects at 200–250 mm without biochar;but it had less influence on the soil water content deeper than 250 *** the application rate of biochar of 4%,most water was retained within 0–250 mm soil ***,when biochar application amount was high(6%),it would be helpful for water *** the improvement of sandy soil,biochar application rate of 4%in the plow layer had the best effect.

关键词： biochar sandy soil water holding capacity water movement drip irrigation

Detecting CD20-Rituximab interaction forces using AFM single-molecule force spectroscopy

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Chinese Science Bulletin 2011年第35期56卷 3829-3835页

作者： li Mi liU lianQing XI Ning WANG YueChao DONG Zaili li guangyong XIAO XiuBin ZHANG WeiJing State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences Shenyang 110016 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Department of Electrical and Computer Engineering Michigan State University East Lansing 48824 USA Department of Electrical and Computer Engineering University of Pittsburgh Pittsburgh 15261 USA Department of Lymphoma Affiliated Hospital of Military Medical Academy of Sciences Beijing 100071 China

The invention of atomic force microscopy(AFM) has provided new technology for measuring specific molecular interaction *** AFM single-molecule force spectroscopy(SMFS) techniques,CD20-Rimximab rupture forces were measured on purified CD20 proteins,Raji cells,and lymphoma patient B *** molecules were linked onto AFM tips using AFM probe functionalization technology,and purified CD20 proteins were attached to mica using substrate functionalization *** cells(a lymphoma cell line) or lymphoma patient cells were immobilized on a glass substrate via electrostatic adsorption and chemical *** topography of the purified CD20 proteins,Raji cells,and patient lymphoma cells was visualized using AFM imaging and the differences in the rupture forces were analyzed and *** results showed that the rupture forces between the CD20 proteins on Raji cells and Rituximab were markedly smaller than those for purified CD20 proteins and CD20 proteins on lymphoma patient B *** findings provide an effective experimental method for investigating the mechanisms underlying the variable efficacy of Rituximab.

关键词：原子力显微镜相互作用力单分子光谱 Raji细胞蛋白质纯化功能化技术 AFM探针

Fully Recyclable liquid Metal-Based Ultra-St retch able Electronics Enabled by Water-Modulation-Degradation-Reconstruction Polymer-Gel

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Energy & Environmental Materials 2024年第5期7卷 400-407页

作者： Husheng Chen Tianfeng Hou Minghua Zhang Jianke Du licheng Hua Xing Chen Aibing Zhang Yuan Jin Lvwen Zhou guangyong li Smart Materials and Advanced Structure Laboratory School of Mechanical Engineering and MechanicsNingbo UniversityNingbo 315211China CAS Key Laboratory of Quantitative Engineering Biology Shenzhen Institute of Synthetic BiologyShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China Beijing Advanced Innovation Center for Biomedical Engineering School of Engineering MedicineBeihang UniversityBeijing 100191China

The rapid development of stretchable electronics made by circuits,microchips,and encapsulation elastomers has caused the production of a large amount of electronic waste(e-waste).The degradation of elastomers can highly minimize the negative effects of ***,chemicals that included acid,alkali,and organics were repeatedly used during the recycling process,which were environmentally ***,a water-modulation-degradation-reconstruction(WDR)polyvinylpyrrolidone(PVP)-honey composite(PHC)polymer-gel was developed and could be regarded as encapsulation elastomers to realize a fully recyclable water-degradable stretchable(WS)electronics with *** stretchability of the PHC polymer-gel could be modulated by the change of its water *** Chip-integrated liquid metal(LM)circuits encapsulated with the modulated PHC encapsulation elastomer could withstand a strain value of~3000%.Moreover,we developed a WS biomedical sensor composed of PHC encapsulation elastomer,LM circuits,and microchips,which could be fully recycled by biodegrading it in water to reconstruct a new *** before,the reconstructed WS biomedical sensor could still simultaneously realize the combination of ultra-stretchability,recycling,self-healing,self-adhesive,and self-conformal *** results revealed that this study exercises a profound influence on the rational design of multi-functional WS electronics.

关键词： liquid metal polymer-gel recycling stretchable electronics water-degradation