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Design,fabrication and energy-saving evaluation of five-layer structure based transparent heat mirror coatings for windows application

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Building Simulation 2023年第12期16卷 2333-2342页

作者： Xiaoqiang Hong yue Yang Huaying Chen qi Tao School of Architecture and Civil Engineering Xiamen UniversityXiamen 361005China Xiamen Key Laboratory of Integrated Application of Intelligent Technology for Architectural Heritage Protection Xiamen UniversityXiamen 361005China Fujian Key Laboratory of Digital Simulations for Coastal Civil Engineering School of Architecture and Civil EngineeringXiamen UniversityXiamen 361005China School of Mechanical Engineering and Automation Harbin Institute of TechnologyShenzhen 518055China

Transparent heat mirror which allows the transmission of visible sunlight while reflects the infrared thermal energy is an effective building energy efficiency technology for hot climatic *** this work,a five-layer dielectric/metal/dielectric/metal/dielectric(DMDMD)coating of Si_(3)N_(4)/Ag/Si_(3)N_(4)/Ag/Si_(3)N_(4)structure is *** radiative properties of the five-layer coatings are theoretically investigated by transfer matrix *** thicknesses of the layers are optimized by using particle swarm optimization *** sample of the designed Si_(3)N_(4)/Ag/Si_(3)N_(4)/Ag/Si_(3)N_(4)coating is prepared and the building energy performance when applying the DMDMD coating in a simple office room is also investigated,taking the hot weather condition of Guangzhou,China as an *** simulated results show that the Tave+Rave value of the five-layer coating is 8%higher than that of the three-layer coating,and the long-wave emittance of the five-layer coating is 24.8%lower than that of the three-layer *** the application of the five-layer coatings on the glazed window could provide the highest energy saving rate of 8.9%when compared with the traditional low-e coatings.

关键词： transparent heat mirror spectrally selective coating energy-efficient windows building energy efficiency

Ion migration in halide perovskite solar cells:Mechanism,characterization,impact and suppression

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Journal of Energy Chemistry 2021年第12期30卷 528-549,I0013页

作者： Huachao Zai yue Ma qi Chen Huanping Zhou Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials Key Laboratory of Polymer Chemistry and Physics of Ministry of EducationBIC-ESATSchool of Materials Science and EngineeringPeking UniversityBeijing 100871China Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications Experimental Center of Advanced MaterialsSchool of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China

Metal halide perovskites are emerging as the most promising candidate for the next-generation Photovoltaics(PV)materials,due to their superior optoelectronic properties and low ***,the resulting Perovskite solar cells(PSCs)suffer from poor *** particular,the temperature and light activated ionic defects within the perovskite lattice,as well as electric-field-induced migration of ionic defects,make the PSCs unstable at operating condition,even with device *** is no doubt that the investigation of ion migration is crucial for the development of PSCs with high intrinsic *** this review,we first briefly introduce the origin and pathways of ion migration,and also the essential characterization methods to identify ion ***,we discuss the impact of ion migration on the perovskite films and cells with respect to photoelectric properties and ***,several representative strategies to suppress ion migration are systematically summarized in the context of composition engineering,additive engineering and interface engineering,with an in-depth understanding on the underlying mechanisms which may provide more clues for further fabrication of PSCs with improved ***,a perspective with some suggestion on future research directions and chemical approaches are provided to alleviate ion migration in perovskite materials and the entire devices.

关键词： Ion migration Perovskite Solar cell Defect Stability

A visualized soundscape prediction model for design processes in urban parks

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Building Simulation 2023年第3期16卷 337-356页

作者： Ran yue qi Meng Da Yang yue Wu Fangfang Liu Wei Yan Key Laboratory of Cold Region Urban and Rural Human Settlement Environment Science and Technology Ministry of Industry and Information TechnologySchool of ArchitectureHarbin Institute of TechnologyChina

Existing soundscape prediction model application conditions and calculation processes are very complex,and difficult to combine with design ***,in this study,a visual soundscape prediction model is constructed for sound pressure level(SPL)prediction,sound source prediction,and soundscape evaluation prediction by inputting the elements of urban design under the meshing method(grid 50 m)into a machine learning Gaussian mixture model(GMM).Taking three typical urban parks as examples,the soundwalk method is used to collect subjective perception information on-site to verify prediction *** results show that by applying geographic information data,including the minimum distance values from predicted points to roads,entrances and exits,and internal nodes,the SPL can be *** the accuracy rate is stable within a 3 dBA error range,the prediction accuracy rate is 67.7%.The visual perception information added is used to quickly predict the sound source type,and the output is the visualized distribution of the natural,human,and mechanical sound perception with a 77.4%accuracy ***,combining geographic,visual and sound data to predict soundscape evaluation,the model's output are good,medium,and poor categories for each descriptor of the soundscape evaluation,and the prediction results are visualized in three colours with a 74.2%accuracy *** convenient soundscape prediction model proposed in this paper can be applied to design *** adjusting park design elements,the distribution results can be compared,and an optimal design scheme from the soundscape perspective can be *** with the model output,this study compares the model simulation results after adjusting the design elements and the original,and proposes targeted optimisation strategies for urban park soundscape.

关键词： soundscape prediction model urban park architectural design visualization

Sulfur cycle as an nitrate in a electron mediator between carbon and constructed wetland microcosm

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Frontiers of Environmental Science & Engineering 2020年第4期14卷 17-29页

作者： Wenrui Guo yue Wen Yi Chen qi Zhou State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China Key Laboratory of the Three Gorges Region's Eco-Environment Ministry of EducationCollege of Environment and EcologyChongqing UniversityChongqing 400044China

A constructed wetland microcosm was employed to investigate the sulfur cycle-mediated electron transfer between carbon and *** accepted electrons from organics at the average rate of 0.84 mol/(m3·d)through sulfate reduction,which accounted for 20.0%of the electron input *** remainder of the electrons derived from organics were accepted by dissolved oxygen(2.6%),nitrate(26.8%),and iron(III)(39.9%).The sulfide produced from sulfate reduction was transformed into acidvolatile sulfide,pyrite,and elemental sulfur,which were deposited in the substratum,storing electrons in the microcosm at the average rate of 0.52 mol/(m3·d).In the presence of nitrate,the acid-volatile and elemental sulfur were oxidized to sulfate,donating electrons at the average rate of 0.14 mol/(m3•d)and driving autotrophic denitrification at the average rate of 0.30 g N/(m3·d).The overall electron transfer efficiency of the sulfur cycle for autotrophic denitrification was 15.3%.A mass balance assessment indicated that approximately 50%of the input sulfur was discharged from the microcosm,and the remainder was removed through deposition(49%)and plant uptake(1%).Dominant sulfatereducing(i.e.,Desulfovirga,Desulforhopalus,Desulfatitalea,and Desulfatirhabdium)and sulfuroxidizing bacteria(i.e.,Thiohalobacter,Thiobacillus,Sulfuritalea,and Sulfurisoma),which jointly flilfilled a sustainable sulfur cycle,were *** results improved understanding of electron transfers among carbon,nitrogen,and sulfur cycles in constructed wetlands,and are of engineering significance.

关键词： Constructed wetland Sulfur cycle Electron transfer Denitrification

Effects of magnetic field on electron power absorption in helicon fluid simulation

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Plasma Science and Technology 2021年第8期23卷 29-37页

作者： Mingyang WU Chijie XIAO yue LIU Xiaoyi YANG Xiaogang WANG Chang tan qi SUN State Key Laboratory of Nuclear Physics and Technology School of PhysicsFusion Simulation CenterPeking UniversityBeijing 100871People's Republic of China Key Laboratory of Materials Modification by Laser Ion and Electron Beams(Ministry of Education)School of PhysicsDalian University of TechnologyDalian 116024People's Republic of China Harbin Institute of Technology Harbin 150001People's Republic of China Shaanxi Key Laboratory of Plasma Physics and Applied Technology Xi'an 710100People's Republic of China Xi'an Aerospace Propulsion Institute Xi'an 710100People's Republic of China School of Physics Beijing Institute of TechnologyBeijing 100081People's Republic of China

In this study,a code,named Peking University Helicon Discharge(PHD),which can simulate helicon discharge processes under both a background magnetic field greater than 500 G and a pressure less than 1 Pa,is *** the code,two fluid equations are *** PHD simulations led to two important findings:(1)the temporal evolution of plasma density with the background magnetic field exhibits a second rapid increase(termed as the second density jump),similar to the transition of modes in helicon plasmas;(2)in the presence of a magnetic field,the peak positions of electron power absorption appeared near the central axis,unlike in the case of no magnetic *** results may lead to an enhanced understanding of the discharge mechanism.

关键词： helicon plasma discharge process numerical simulation

Better nutrition, healthier mind? Experimental evidence from primary schools in rural northwestern China

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Journal of Integrative Agriculture 2019年第8期18卷 1768-1779页

作者： LIU Xiao-yue ZHAO qi-ran CHEN qi-hui Center for Food and Health Economic Research College of Economics and Management China Agricultural University

Malnutrition and mental health problems are both prevalent among rural students in China. To provide a better understanding of the functional linkage between these two problems, this study estimates the causal effect of improved nutrition on rural students’ mental health status, exploiting a randomized controlled trial involving 6 044 fourth and fifth graders in rural northwestern China. Estimation results show that a nutrition subsidy provided by the project significantly improved students’ mental health status(measured by their anxiety scale). However, an add-on incentive provided to school principals, which was tied to anemia reduction, almost entirely offset the beneficial impact of the nutrition subsidy. These findings suggest that to improve students’ mental health in rural China, not only direct subsidies, such as low-priced school meals, but also correct incentives, especially those tied closely to students’ mental health outcomes, should be provided.

关键词： malnutrition mental health randomized controlled trial rural China

Characterization of humic substances in bio-treated municipal solid waste landfill leachate

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Frontiers of Environmental Science & Engineering 2012年第5期6卷 711-716页

作者： Guangxia qi Dongbei yue Yongfeng NIE Key Laboratory for Solid Waste Management and Environment Safety(Ministry of Education) Tsinghua UniversityBeijing 100084China

Considerable organic matter remains in muni- cipal solid waste landfill leachate after biological treat- ments. Humic substances （HSs） dominate the organic matter in bio-treated landfill leachate. In this study, the HSs from landfill leachate treated by membrane bioreactor （MBR-HSs） were analyzed via elemental analysis, ultra- violet-visible spectroscopy, Fourier transform infrared spectroscopy, and charge polarized magic-angle spin- ning-~3C-nuclear magnetic resonance. The characteristic absorption in the UV wavelength range indicated the presence of high C=C and C=O double bonds within the MBR-HSs. Compared with commercial HSs, MBR-HSs had lower carbon content [48.14% for fulvic acids （FA） and 49.52% for humic acids （HA）], higher nitrogen content （4.31% for FA and 6.16% for HA）, lower aromatic structure content, and higher carbohydrate and carboxylic atoms of carbon content. FA predominantly had an aliphatic structure, and HA had less condensed or substituted aromatic ring structures than natural HA. The aromatic carbon content of MBR-HSs was lower than that of humus-derived HSs but higher than that of waste- derived HSs, indicating that MBR-HSs appeared to be more similar to humus-derived HSs than waste-derived HA.

关键词： bio-treated landfill leachate humic sub-stances elemental analysis spectroscopic characteristics

The Promiscuous Activity of the Radical SAM Enzyme NosL toward Two Unnatural Substrates

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Chinese Journal of Chemistry 2021年第9期39卷 2417-2421页

作者： yue Yin Xinjian Ji qi Zhang Department of Chemistry Fudan UniversityShanghai 200433China

The radical S-adenosyImethionine(SAM)enzyme NosL catalyzes the conversion of L-tryptophan((-Trp,1)to 3-methyl-2-indolic acid(MIA,2),a key in termediate in the biosynthesis of the peptide an tibiotic no *** study showed that this remarkable recombination reaction starts from the cleavage of the Cα-COO^(-) bond to result in a·CO_(2)^(-) radical *** contrast to the radical SAM tyrosine lyases,NosL appears unable to cleave the Cα-Cβ bond,which is intrinsically more favorable to be cleaved than the Cα-COO^(-) *** this study,we investigate the NosL activity with tryptamine(11)and tryptophol(12),two L-Trp analogues lacking a carboxylate *** showed that NosL cleaves the C1-C2 bond of these two substrates to produce 3-methylindole(7),suggesting that the enzyme can still catalyze a β-scission when the carboxyl group of Trp is *** also showed the enzyme exhibits a promiscuous activity,initiating the reaction by abstracting hydrogen atoms from two different sites to produce two sets of products.

关键词： Biosynthesis Antibiotics Cleavage reactions Lyase Enzyme catalysis

Chinese Relation Extraction on Forestry Knowledge Graph Construction

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Computer Systems Science & Engineering 2021年第6期37卷 423-442页

作者： qi yue Xiang Li Dan Li College of Information and Computer Engineering Northeast Forestry UniversityHarbin150040China

Forestry work has long been weak in data integration;its initial state will inevitably affect the forestry project development and *** Graph(KG)can provide better abilities to organize,manage,and understand forestry *** Extraction(RE)is a crucial task of KG construction and information *** researches on relation extraction have proved the performance of using the attention ***,these methods focused on the representation of the entire sentence and ignored the loss of *** lack of analysis of words and syntactic features contributes to sentences,especially in Chinese relation extraction,resulting in poor *** on the above observations,we proposed an end-to-end relation extraction method that used Bi-directional Gated Recurrent Unit(BiGRU)neural network and dual attention mechanism in forestry KG *** dual attention includes sentence-level and word-level,capturing relational semantic words and direction *** enhance the performance,we used the pre-training model FastText to provide word vectors,and dynamically adjusted the word vectors according to the *** used forestry entities and relationships to build forestry KG and used Neo4j to store forestry *** method can achieve better results than previous public models in the SemEval-2010 Task 8 *** training the model on forestry dataset,results showed that the accuracy and precision of FastText-BiGRU-Dual Attention exceeded 0.8,which outperformed the comparison methods,thus the experiment confirmed the validity and accuracy of our *** the future,we plan to apply forestry KG to question and answer system and achieve a recommendations system for forestry knowledge.

关键词： Forestry KG RE BiGRU dual attention FastText