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Effect of hydration on the elasticity of mantle minerals and its geophysical implications

Science China Earth Sciences 2016年第5期59卷 873-888页

作者： MAO Zhu li xinyang Laboratory of Seismology and Physics of Earth's Interior School of Earth and Space Sciences University of Science and Technology of China Hefei 230026 China National Geophysics Observatory at Mengcheng Mengcheng 233500 China

Recent studies have shown that major nominally anhydrous minerals in the Earth's mantle, such as olivine, pyroxene and garnet, can incorporate considerable amounts of water as structurally bound hydroxyl. Even a small amount of water is present in mantle minerals, it can strongly affect a number of physical properties, including density, sound velocity, melting temperature, and electrical conductivities. The presence of water can also influence the dynamic behavior, lead to lateral velocity heterogeneities, and affect the material circulation of the Earth's deep interior. In particular, seismic studies have reported the existence of low-velocity zones in various locations of the Earth's upper mantle and transition zone, which has been expected to be associated with the presence of water in the region. In the past two decades, the effect of water on the elasticity and sound velocities of minerals at relevant pressure-temperature(P-T) conditions of the Earth's mantle attracted extensive interests. Combining the high P-T experimental and theoretical mineralogical results with seismic observations provides crucial constraints on the distribution of water in the Earth's mantle. In this study, we summarize recent experimental and theoretical mineral physics results on how water affects the elasticity and sound velocity of nominally anhydrous minerals in the Earth's mantle, which aims to provide new insights into the effect of hydration on the density and velocity profile of the Earth's mantle, which are of particular importance in understanding of water distribution in the region.

关键词： Water Elasticity Sound velocity Upper mantle Transition zone Olivine polymorphs

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Characteristics of Bi-2223 HTS Tapes Under Short-Circuit Current Impacts in Hybrid Energy Transmission Pipelines

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CSEE Journal of Power and Energy Systems 2024年第2期10卷 736-745页

作者： Yuguang Sun Chao Yin Weizhen li xinyang li Xiaohua Jiang Department of Electric Engineering Tsinghua UniversityBeijing 100084China

A hybrid energy transmission pipeline is proposed with the aim of long-distance cooperative transmission of electricity and chemical fuels, which is composed of an inner high-temperature superconducting (HTS) power cable and outer liquefied natural gas (LNG) pipeline. The flowing LNG could maintain the operating temperature of the inner HTS power cable within the range of 85 K-90 K, thus the Bi-2223 superconductors in the HTS power cable produce little Joule loss with the transmission current below the critical current. Owing to the advantages of high power density, low transmission losses and economical manufacturing costs, the hybrid energy transmission pipeline is expected to be widely utilized in the near future. In order to ensure the safety of the HTS power cable and explosive LNG in case of short-circuit faults, this paper tests and analyzes the characteristics of Bi-2223 HTS tapes of the Type HT-CA, Type HT-SS and Type H models under short-circuit current impacts at the LNG cooling temperature (85 K-90 K). An experimental platform is designed and established for the ampacity tests of HTS tapes above LN2 cooling temperature (77 K). The AC over-current impact tests at 85 K-90 K are carried out on each sample of Bi-2223 tapes respectively, and the experimental results are analyzed and compared to evaluate their performances under different operating conditions. The results indicate that the Type HT-CA tape can withstand 50 Hz short-circuit current impact with the amplitude of 1108 A (10 times of critical current Ic ) for 100 ms at 90 K, and its resistance is the smallest of the three tested samples under similar current impacts. Therefore, the Type HT-CA Bi-2223 tape is the optimal superconductor of the HTS power cable in the hybrid energy transmission pipeline.

关键词： Bi-2223 high-temperature superconducting(HTS)tape critical current hybrid energy transmission pipeline liquefied natural gas(LNG)cooling temperature short-circuit current impact characteristics

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Bluetooth Low Energy Device Identification Based on link Layer Broadcast Packet Fingerprinting

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Tsinghua Science and Technology 2023年第5期28卷 862-872页

作者： Jinghui Zhang xinyang li Junhe li Qiangsheng Dai Zhen ling Ming Yang School of Computer Science and Engineering Southeast UniversityNanjing 211189China School of Cyber Science and Engineering Southeast UniversityNanjing 211189China Research Institute State Grid Jiangsu Electric Power Company Ltd.Nanjing 210024China

With the rapid development of the Internet of Things(IoT),wireless technology has become an indispensable part of modern computing platforms and embedded *** device fingerprint identification is deemed as a promising solution towards enhancing the security of device access authentication and communication process in the IoT ***,the extraction of features from the network layer and its upper layers often confront restrictions from specific devices:the association with a certain wireless network and the access to the plaintext of the ***,Bluetooth Low Energy(BLE)packets have been encrypted above the link layer,which makes those features difficult to *** tackle these problems,we introduce a novel method to identify BLE devices based on the fingerprint features in the data link ***,the BLE packets are collected through a receiver based on software-defined radio ***,fields that reflect device differences in BLE broadcast packets are extracted through traffic ***,a MultiLayer Perceptron(MLP)model is employed to recognize the category of BLE *** experimental result on a dataset with 15 types of BLE devices shows that the identification accuracy of the proposed method can reach 99.8%,which accomplishes better performance over previous work.

关键词： link layer fingerprint software-defined radio Bluetooth Low Energy(BLE)

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Effect of Particle Orientation on Heat Transfer in Arrays of Prolate Particles

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Computer Modeling in Engineering & Sciences 2023年第8期136卷 1509-1526页

作者： Romana Basit xinyang li Zheqing Huang Qiang Zhou School of Chemical Engineering and Technology Xi’an Jiaotong UniversityXi’anChina State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’anChina

Direct Numerical Simulations have been carried out to study the forced convection heat transfer of flow through fixed prolate particles for a variety of aspect ratios ar={5/4,5/3,5/1}with Reynolds number(Re)up to *** variations of the solid volume fraction c={0.1,0.2,0.3}with four Hermans orientation factors S={−0.5,0,0.5,1}are *** has been found that changes in S cause prominent variations in the Nusselt *** general,Nusselt number increases with the decrease of *** all three aspect ratios,the Nusselt number remains a linear function of S at different c and ***,it is concluded that,for heat transfer from prolate muti-particle system,the effects of orientations cannot be ignored.A new correlation for Nusselt number has been developed for arrays of prolate particles using the simulation data as a function of Re,c,S and ar.

关键词： Direct Numerical Simulation heat transfer lattice Boltzmann method particle orientations prolate particles

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Response of plant,litter,and soil C:N:P stoichiometry to growth stages in Quercus secondary forests on the Loess Plateau,China

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Journal of Forestry Research 2023年第3期34卷 595-607页

作者： Juanjuan Zhang xinyang li Meng Chen linjia Huang Ming li Xu Zhang Yang Cao College of Forestry Northwest A&F UniversityYangling 712100People’s Republic of China State Key Laboratory of Soil Erosion and Dryland Farming On Loess Plateau Northwest A&F UniversityYangling 712100ShaanxiPeople’s Republic of China Institute of Soil and Water Conservation Chinese Academy of Sciences and Ministry of Water ResourcesYangling 712100ShaanxiPeople’s Republic of China

Ecological stoichiometry is an important indicator of biogeochemical cycles and nutrient limitations in terrestrial ***,little is known about the response of ecological stoichiometry to plant *** this study,carbon(C),nitrogen(N),and phosphorus(P)concentrations were evaluated in plant tissues(trees,shrubs,and herbs),litter,and soil of young(≤40-year-old),middle-aged(41–60-year-old),near-mature(61–80-year-old),and mature(81–120-year-old)Quercus secondary forests on the Loess Plateau,*** composition,plant biomass,and C stock were determined to illustrate their interaction with *** tree biomass C signifi cantly increased with stand *** N and trunk P concentrationsgenerally increased,but branch P decreased with growth *** roots had the highest C and P concentrations at the middle-aged *** contrast,shrubs,herbs,litter,and soil C:N:P stoichiometry did not change signifi cantly during stand *** N and P were positively correlated with soil C,N,P,and their ***,there was no signifi cant correlation between litter and leaves in terms of C:N:P stoichiometry.A redundancy analysis showed that soil N best explained leaf N and P variance,and tree biomass and C stock were related to biotic factors such as tree age and shrub *** partitioning analysis indicated that,compared with soil or litter variables,stand age only accounted for a relatively small proportion of leaf C,N,and P ***,secondary Quercus ecosystems might have inherent ability to maintain sensitive responses of metabolically active organs to environmental factors during stand *** results of this work help to elucidate the biogeochemical cycling of secondary forest ecosystems in tree development,provide novel insights into the adaptation strategies of plants in diff erent organs and growth stages,and could be used to guide fertilization programs and optimize forest structure.

关键词： Ecological stoichiometry Tree biomass C stock Understory plant Age Stand development

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Study on the investment value and investment opportunity of renewable energies under the carbon trading system

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Chinese Journal of Population,Resources and Environment 2016年第4期16卷 271-281页

作者： Piqin Gong xinyang li School of Management and Economics Beijing China School of Software and Microelectronics Peking University Beijing China

China has promised to start the national carbon trading system in *** the carbon trading system,the renewable energy projects may obtain additional benefits through the Certified Carbon Emission Reduction(CCER) *** the carbon price fluctuates along with the market conditions,such fluctuation enables the renewable power projects to acquire the rights of an option,*** may contain an even higher value due to the uncertainties in the *** making an investment decision,the renewable power companies may choose to make the investment immediately,or postpone the investment and accumulate more information to increase the return of investment;and for immediate investments,the return must be sufficient to exceed the potential value of a waiting *** study the investment in renewable power projects subject to the fluctuation of carbon price,this paper adopts the trinomial tree model of real options to estimate the net present value(NPV) and real option value(ROV) of three types of renewable power projects;according to the decision-making rules of real options to defer,all the three types of projects will exercise the option to postpone the investment *** thesis also calculates the benchmark prices of the three types of renewable projects at different times,in the two situations of having no government subsidy and having the government subsidy,so as to determine the investment opportunity of a *** benchmark price decreases gradually along with the increase of government subsidy,indicating that the government subsidy will stimulate the investment in renewable *** benchmark price also increases gradually along with the lapse of time,indicating that the uncertainty will increase together with the time span and thus requires an even higher carbon price to determine the investment *** thesis also analyzes the sensitivity of factors affecting the investment in renewable projects and draws the conclusion that the fluctuat

关键词： Renewable energies trinomial tree model carbon trading fluctuation of carbon price

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Functionalized periodic Au@MOFs nanoparticle arrays as biosensors for dual-channel detection through the complementary effect of SPR and diffraction peaks

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Nano Research 2017年第7期10卷 2257-2270页

作者： lifeng Hang Fei Zhou Dandan Men Huilin li xinyang li Honghua Zhang Guangqiang liu Weiping Cai Cuncheng li Yue li Key Lab of Materials Physics Anhui Key Lab of Nanomaterials and Nanotechnology Institute of Solid State Physics Chinese Academy of Sciences Hefei 230031 China University of Science and Technology of China Hefei 230026 China School of Chemistry and Chemical Engineering University ofJinan Jinan 250022 China

A facile and low-cost method to prepare periodic Au@metal-organic framework （MOF）（MIL-100（Fe）） nanoparticle arrays was developed. The arrays were fabricated in situ using monolayer colloidal crystals as templates, followed by Au deposition on substrates, and annealing. MIL-100（Fe） coatings were applied on the nanospheres using a simple solvent thermal process. The prepared periodic Au@MIL-100（Fe） nanoparticle （NP） arrays were characterized by two peaks in the visible spectra. The first peak represented the surface plasmon resonance （SPR） of the Au nanospheres, and the other peak, or the diffraction peak originated from the periodic structure in the NP array. After modification with 3-aminophenylboronic acid hemisulfate （PBA）, the Au@MIL-100（Fe） NP arrays exhibited sensitive responses to different glucose concentrations with good selectivity. These responses could be due to the strong interaction between PBA and glucose molecules. The diffraction peak was sensitive at low glucose concentrations （less than 12 mM）, whereas the SPR peak rapidly responded at high concentrations. The peaks thus demonstrated satisfactory complementary sensitivity for glucose detection in different concentration regions. These results can be used to develop a dual-channel biosensor. We also created a standard diagram, which can be used to efficiently monitor blood glucose levels. The proposed strategy can be extended to develop different dual-channel sensors using Au@MIL-100（Fe） NP arrays agents. functionalized with different recognition

关键词： Au nanosphere array Au@MIL-100(Fe) 3-aminophenylboronicacid hemisulfate glucose dual-channel detection

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Electro-catazone treatment of an ozone-resistant drug:Effect of sintering temperature on TiO_(2) nanoflower catalyst on porous Ti gas diffuser anodes

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Chinese Chemical Letters 2021年第10期32卷 3221-3225页

作者： xinyang li Yannan li Hao Zhang Zhen Shen Shuang Cheng Guicheng liu Hong Yao Beijing International Scientific and Technological Cooperation Base of Water Pollution Control Techniques for Antibiotics and Resistance Genes Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality SafeguardDepartment of Municipal and Environmental EngineeringSchool of Civil EngineeringBeijing Jiaotong UniversityBeijing 100044China Department of Physics Dongguk UniversitySeoul 04620Republic of Korea

Electrochemical heterogeneous catalytic ozonation(E-catazone) is a promising and advanced oxidation technology that uses a titanium dioxide nanoflower(TiO_(2-NF))-coated porous Ti gas diffuser as an anode *** previous study has highlighted that the importance of the TiO_(2-NF)coating layer in enhancing*OH production and rapidly degrading O_(3)-resistant *** is well known that the properties of TiO_(2-NF)are closely related to its sintering ***,to date,related research has not been conducted in E-catazone ***,this study evaluated the effect of the sintering temperature on the degradation of the O_(3)-resistant drug para-chlorobenzoic acid(p-CBA) using both experimental and kinetic modeling and revealed its influence *** results indicated that the TiO_(2-NF)sintering temperature could influence p-CBA degradation and*OH ***_(2-NF)prepared at 450 C showcased the highest p-CBA removal efficiency(98.5% in 5 min) at a rate of 0.82 min^(-1),and an*OH exposure of 8.41 x 10^(-10) mol L^(-1) *** modeling results and interface characterization data revealed that the sintering temperature could alter the TiO_(2) crystallized phase and the content of surfaceadsorbed oxygen,thus affecting the two key limiting reactions in the E-catazone *** is,≡TiO_(2) surface reacted with H_(2) O to form TiO_(2)-(OH)_(2),which then heterogeneously catalyzed O_(3) to form ****,E-catazone with a TiO_(2-NF)anode prepared at 450°C generated the highest surface reaction rate(5.00 x 10^(-1) s^(-1) and 4.00 x 10^(-3) L mol^(-1) s^(-1),respectively),owing to its higher anatase content and adsorbed ***,a rapid O_(3)-TiO_(2) reaction was achieved,resulting in an enhanced*OH formation and a highly effective p-CBA ***,this study provides novel baseline data to improve the application of E-catazone technology.

关键词： Electrochemical Ozonation Sintering temperature Crystallized phase Interface reactions

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Direct fabrication of carbon nanotube-graphene hybrid films by a blown bubble method

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Nano Research 2015年第5期8卷 1746-1754页

作者： Shiting Wu Enzheng Shi Yanbing Yang Wenjing Xu xinyang li Anyuan Cao Department of Materials Science and Engineering College of Engineering Peking University Beijing 100871 China College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 China

Hybridization of carbon nanotubes （CNT） with graphene provides a promising means of integrating the attributes of both materials, thereby enabling widespread application. Here, we present a method to directly assemble hybrid CNT- graphene films by a blown bubble method combined with selective substrate annealing. We use polymethylmethacrylate （PMMA） as the polymeric matrix to blow bubbles containing self-assembled multi-walled CNT arrays, and then transform the bubble film into a CNT-graphene hybrid film by thermal annealing on a Cu substrate; PMMA serves as the carbon source for growing single to few-layer graphene among the CNT network until a continuously hybridized structure is formed. Compared to the bare （non-hybridized） CNT networks, the hybrid films exhibit improved electrical conductivity and structural integrity. Our method also enables the fabrication of a multi-walled CNT-Si solar cell, which has high power conversion efficiency, through the assembly of hybrid CNT-graphene structures.

关键词： carbon nanotube graphene hybrid structure blown bubble assembly solar cell

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Fabrication and mechanical properties of single-wall carbon nanotubes and hyperbranched diazonium salt multilayers

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Frontiers of Chemical Science and Engineering 2008年第3期2卷 286-290页

作者： xinyang li Pengwei FAN Xinlin TUO Xiaogong WANG Department of Chemical Engineering Laboratory for Advanced MaterialsTsinghua UniversityBeijing 100084China

Acidized single-wall carbon nanotubes(SWNTs)were fabricated into multilayers with a hyperbranched azobenzene-containing polymeric diazonium salt(PDAS)using the layer-by-layer adsorption *** fabrication process,multilayer thickness variation,multilayer surface morphology and the interaction between SWNTs and PDAS were monitored byUV-Vis absorption spectroscopy,optical ellipsometry,Atomic Force Microscopy,Scanning Electron Microscopy and Raman ***,the nanomechanical properties of the multilayer films were measured by *** results show that SWNTs and PDAS can be fabricated intomultilayers based on the cooperation of electrostatic absorption and chemical cross-linkage between SWNTs and ***,this cooperation endows the SWNT/PDAS multilayer films with outstanding nanomechanical *** hardness and modulus are about 2.0GPa and 10.0GPa,***,the SWNT/PDAS multilayer film can be peeled off to be a free-standing film.

关键词： SWNTs PDAS Cross-linkage Self-assembled multilayers

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