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Self-assembly and electrochromic property of electroactive tetraaniline-b-PEG diblock copolymer

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Science China Chemistry 2017年第1期60卷 99-104页

作者： Linyu Cao Jiping Yang Chen Gong meng wang Key Laboratory of Aerospace Advanced Materials and Performance Ministry of Education School of Materials Science and Engineering Beihang University Beijing 100083 China

A kind of amphiphilic rod-coil diblock copolymer consisting both of tetraaniline(TAni)and polyethylene glycol(PEG)blocks,TAni-b-PEG,was *** diblock copolymer shows excellent electrochromic properties,especially,in switching time and coloration efficiency compared with ***-b-PEG is able to self-assemble into spherical structure,which is attributed to the formation of conducting channels and increase of ion-exchange capacity of TAni-b-PEG,implying that a block copolymer with electrochromic block and high ionic conductive block simultaneously possesses improving electrochromic properties.

关键词： tetraaniline PEG block copolymer self-assembly electrochromic property

Position Control of a Series Elastic Actuator Based on Global Sliding Mode Controller Design

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IEEE/CAA Journal of Automatica Sinica 2019年第3期6卷 850-858页

作者： Wei Yin Lei Sun meng wang Jingtai Liu IEEE the Institute of Robotics and Automatic Information System Nankai University and also with Tianjin Key Laboratory of Intelligent Robotics

A series elastic actuator(SEA) is a powerful device in the area of human-machine integration, but it still suffers from difficult position control issues. Therefore, in this paper,an efficient approach is proposed to solve this problem. The approach design is divided into two steps: feedback linearization(FL) and global sliding mode(GSM) controller design. The bounded analysis is presented and global asymptotic convergence is analytically proven. Simulation and experiment results illustrate the effectiveness of the proposed scheme.

关键词： Feedback linearization (FL) global sliding mode (GSM) position control series elastic actuator (SEA)

Coral-like carbon-based composite derived from layered structure Co-MOF-71 with outstanding impedance matching and tunable microwave absorption performance

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Journal of Materials Science & Technology 2022年第13期108卷 10-17页

作者： Panpan Zhou meng wang Zhi Song Yongkang Guan Lixi wang Qitu Zhang College of Materials Science and Engineering Nanjing Tech UniversityNanjing 211816China Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites Nanjing 211816China

Metal-organic frameworks(MOFs)are considered as a novel type of microwave absorption(MA)material owing to the sufficient pore structure,diverse configurations,and easy-to-control magnetic ***,their evolution is limited by the imperfect impedance matching conditions caused by the undesirable ***,two types of novel porous coral-like carbon/Co_(3)O_(4)and carbon/Co composites have been effectively fabricated for the first time by a facile heat treatment process of precursor *** graphitization degree,magnetic property and MA ability of the product can be effortlessly tuned by altering the heat treatment temperature of ***,S500(Co-MOF-71 calcined at 500℃)composite displays strong and multi-frequency absorption performance,whose minimum reflection loss(RL)value achieves-36.4 d B with an absorbing thickness of 3.0 mm and attains an effective absorbing bandwidth(RL≤-10 dB)of 5.76 GHz(almost covers whole Ku band)at a thinner coating thickness of 2.5 *** superb MA ability has roots in the coral-like structure derived from the layer Co-MOF-71,sufficient electromagnetic *** work ameliorates the MA ability of MOFs through a special nanostructural design,which provides a fresh way for the preparation of novel MA materials.

关键词： Co-MOF-71 Coral-like structure Ku band Magnetoelectric synergy Electromagnetic absorption

Cobalt oxide and carbon modified hematite nanorod arrays for improved photoelectrochemical water splitting

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Chinese Chemical Letters 2017年第12期28卷 2207-2211页

作者： Miao wang meng wang Yanming Fu Shaohua Shen International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi'an fiaotong UniversityXi'on 710049China

Given the proper band gap, low cost and good stability, hematite （α-Fe2O3） has been considered as a promising candidate for photoelectrochemical （PEC） water splitting, however suffers from the sluggish surface water oxidation reaction kinetics. In this study, a simple dip-coating process was used to modify the surface of α-Fe2O3 nanorod arrays with cobalt oxide （COOx） and carbon （C） for the improved PEC performance, with a photocurrent density at 1.6V （vs. reversible hydrogen electrode, RHE） increased from 0.10 mA/cm2 for the pristine α-Fe2O3 to 0.37 mA/cm2 for the CoOx/C modified α-Fe2O3 nanorods. As revealed by electrochemical analysis, thanks to the synergistic effect of CoOx and C, the PEC enhancement could be attributed to the enhanced charge transfer ability, decreased surface charge recombination, and accelerated water oxidation reaction kinetics. This study serves as a good example for improving PEC water splitting performance via a simple method.

关键词： Hematite nanorodsSurface modificationPhotoelectrochemical water splittingWater oxidationElectrochemical impedance spectroscopy

Flexible Vis/NIR wireless sensing system for banana monitoring

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Food Quality and Safety 2023年第3期7卷 492-502页

作者： meng wang Bingbing wang Ruihua Zhang Zihao Wu Xinqing Xiao College of Engineering China Agricultural UniversityBeijingChina

Objectives:The quality of the fruit seriously affects the economic value of the *** quality is related to many ripening parameters,such as soluble solid content(SSC),pH,and firmness(FM),and is a complex *** methods are inefficient,do not guarantee quality,and do not adapt to the current rhythm of the fruit *** this paper,a was designed and implemented for quality prediction and maturity level classification of Philippine Cavendish *** and Methods:The quality changes of bananas in different stages were *** light intensity reflectance values for each maturity stage were compared to conventionally measured SSC,FM,PH,and color ***:Our device can be compared with traditional forms of quality *** experimental results show that the established predictive model with specific preprocessing and modeling algorithms can effectively determine various banana quality parameters(SSC,pH,FM,L^(*),a^(*),and b^(*)).The RPD values of SSC and a^(*)were greater than 3.0,the RPD values of L^(*)and b^(*)were between 2.5 and 3.0,and the pH and FM were between 2.0 and *** addition,a new banana maturity level classification method(FSC)was proposed,and the results showed that the method could effectively classify the maturity level classes(*** maturity levels)with an accuracy rate of up to 97.5%.Finally,the MLR and FSC models are imported into the MCU to realize the near-range and long-range real-time display of ***:These methods can also be applied more broadly to fruit quality detection,providing a basic framework for future research.

关键词： Banana Vis/NIR flexibility ripening classification chemometrics

Diagenesis of shale and its control on pore structure, a case study from typical marine, transitional and continental shales

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Frontiers of Earth Science 2021年第2期15卷 378-394页

作者： Weidong XIE meng wang Hua wang Ruying MA Hongyue DUAN School of Earth Resources China University of GeosciencesWuhan 430074China Low Carbon Energy Institute China University of Mining and TechnologyXuzhou 221008China College of Geology and Mining Engineering Xinjiang UniversityUrumqi 830000China

Due to discrepancies in pore structure,the productivity of shale gas reservoirs under different diagenesis stages varies *** study discussed the controlling of sedimentation and diagenesis on shale pore structure in typical marine,transitional,and continental shales,*** shale samples from the Shuinan Formation,Jiaolai Basin,transitional shale samples from the Taiyuan,Shanxi and Xiashihezi Formations,Ordos Basin,and marine shale samples from the Longmaxi Formation,Sichuan Basin,were *** electron microscope with argon ion polishing,high-pressure mercury injection,and low-temperature nitrogen adsorption experiments were conducted to acquire pore structure *** the diagenetic stage of the reservoir was classified according to thermal maturity,organic geochemical parameters,and mineral *** results exhibit that continental,transitional,and marine shales are period A,period B of the middle diagenetic stage,and the late diagenetic stage,*** pore structure,micropore(0–2 nm)and mesopore(2–50 nm)controlled pore volume and specific surface area of transitional and marine shales,and specific surface area of continental shale have similar results,while micropore,mesopore,and macropore(>50 nm)all have a significant proportion of pore volume in continental *** pore structure characteristics and controlling factors exhibit a pronounced difference in different diagenesis stages,the compaction and cementation in period A of the middle diagenesis stage is relatively weak,intergranular pore and interlayer pore of clay minerals are well preserved,and moldic pore and dissolved pore developed as well;organic matter is in high maturity in period B of the middle diagenesis stage,organic matter pore developed correspondingly,while the intergranular pore developed poorly affected by compaction,notably,the carbonate is negligible in transitional shale,and the interlayer pore of clay minerals are well preserved

关键词： shale gas reservoirs diagenesis stage pore structure controlling factors

Food Insecurity and Depressive Symptoms in Adolescents Aged 12–15 Years from Low- and Middle-Income Countries

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International Journal of Mental Health Promotion 2021年第2期23卷 177-187页

作者： meng wang School of Sports and Health Nanjing Sport of InstituteNanjing210014China

Purpose:Little is known about the role of food insecurity(FIS)on depressive symptoms among ***,this study aimed to explore the association between FIS and depressive symptoms among adolescents aged 12–15 years from low-and middle-income countries across the ***:Data from the Global school-based Student Health Survey were analyzed in 51,702 adolescents[mean(SD)age 13.8(1.0)years;49.3% girls].Self-reported measures assessed depressive symptoms during the past 12 months,and food ***-pants reporting yes for depressive *** was categorized intofive levels,including‘never’,‘rarely’,‘some-times’,‘most of the time’and‘always’.Multivariable logistic regression analysis was performed,and a country-wise meta-analysis was undertaken to compare country difference in the associations between FIS and depressive ***:The prevalence of depressive symptoms was 30.0%,*** with those reporting never for FIS,adolescents with increased severity of FIS were more likely to report depressive symptoms regardless of ***-wise meta-analysis demonstrated that having FIS versus not having FIS was asso-ciated with 60%greater odds for depressive symptoms(OR=1.60;95%CI:1.52–1.69)but with a moderate between-country heterogeneity(I^(2)=12.7%).Conclusion:The current study indicates that alleviating FIS may be an effective prevention against depressive symptoms among adolescents from *** studies should adopt improved study design to confirm or negate our researchfindings,which informs more efficient public mental health interventions.

关键词： Food insecurity depressive symptoms global school-based health survey low-and middle-income countries

Characterization of Bacterial Community Structure and Diversity in Rhizosphere Soils of Three Plants in Rapidly Changing Salt Marshes Using 16S rDNA

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Pedosphere 2007年第5期17卷 545-556页

作者： wang meng CHEN Jia-Kuan LI Bo Coastal Ecosystems Research Station of Yangtze River Estuary Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering Institute of Biodiversity Science Fudan University 220 Handan Road Shanghai 200433 （China）.

The structure and diversity of the bacterial communities in rhizosphere soils of native Phragmites australis and Scirpus rnariqueter and alien Spartina alterniflora in the Yangtze River Estuary were investigated by constructing 16S ribosomal DNA （rDNA） clone libraries. The bacterial diversity was quantified by placing the clones into operational taxonomic unit （OTU） groups at the level of sequence similarity of 〉 97%. Phylogenetic analysis of the resulting 398 clone sequences indicated a high diversity of bacteria in the rhizosphere soils of these plants. The members of Alphaproteobacteria, Betaproteobacteria, Gammaproteobacteria, and Deltaproteobacteria of the phylum Proteobacteria were the most abundant in rhizobacteria. Chao 1 nonpaxametric diversity estimator coupled with the reciprocal of Simpson＇s index （l/D） was applied to sequence data obtained from each library to evaluate total sequence diversity and quantitatively compare the level of dominance. The results showed that Phragmites, Scirpus, and Spartina rhizosphere soils contained 200, 668, and 382 OTUs, respectively. The bacterial communities in the Spartina and Phragraites rhizosphere soils displayed species dominance revealed by 1/D, whereas the bacterial community in Scirpus rhizosphere soil had uniform distributions of species abundance. Overall, analysis of 16S rDNA clone libraries from the rhizosphere soils indicates that the changes in bacterial composition may occur concomitantly with the shift of species composition in plant communities.

关键词： 16S rDNA bacterial diversity plant succession rhizosphere salt marshes

Sustainable Seawater Desalination and Energy Management:Mechanisms,Strategies,and the Way Forward

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Research 2024年第3期2023卷 595-611页

作者： meng wang Yen Wei Ruoxin Li Xin wang Chengyu wang Nanqi Ren Shih-Hsin Ho State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin 150001China Department of Chemistry Tsinghua UniversityBeijing 100084China Key Laboratory of Bio-based Material Science&Technology(Northeast Forestry University) Ministry of EducationHarbin 150040China.

Solar-driven desalination systems have been recognized as an effective technology to address the water ***,evaporators prepared based on advanced manufacturing technologies have emerged as a promising tool in enhancing ocean energy *** this review,we discussed the thermal conversion,energy flow,salt deposition mechanisms,and design strategies for solar-driven desalination systems,and explored how to improve the desalination performance and energy use efficiency of the systems through advanced manufacturing *** future perspectives,we determined the feasibility of coupling solar-driven solar desalination systems with multi-stage energy utilization systems and emerging artificial intelligence technologies,for which conclusions are given and new directions for future desalination system development are ***,exciting opportunities and challenges in the face of basic research and practical implementation are discussed,providing promising solutions and blueprints for green and novel desalination technologies while achieving sustainable development.

关键词： Sustainable Solar directions