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Nanodiamond/Ti_(3)C_(2) MXene-coated quartz crystal microbalance humidity sensor with high sensitivity and high quality factor

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Rare Metals 2024年第6期43卷 2719-2729页

作者： Yao Yao Qiao Chen Yan-Qi Li Xian-He Huang Wei-Wei Ling Zhe-MiaoXie jia-QiWang chang-ming Chen College of Communication Engineering Chengdu University of Information TechnologyChengdu 610225China School of Automation Chongqing University of Posts and TelecommunicationsChongqing 400065China School of Automation Engineering University of Electronic Science and Technology of ChinaChengdu 611731China Advanced Micro-/Nano-Devices Lab Department of Systems Design EngineeringUniversity of WaterlooWaterlooON N2L 3GlCanada

To address the challenge of achieving both high sensitivity and a high quality factor in quartz crystal microbalance(QCM)humidity sensors,a nanodiamond(ND)/Ti_(3)C_(2)MXene composite-coated QCM humidity sensor was *** material characteristics of ND,Ti_(3)C_(2)MXene,and ND/Ti_(3)C_(2)MXene composite were analyzed by transmission electron microscopy(TEM)and Fourier transform infrared(FTIR)*** experimental results demonstrated that the hydrophilic ND nanoparticles coated on Ti_(3)C_(2) MXene nanosheet prevented the self-stacking of Ti_(3)C_(2)MXene and enhanced the sensitivity of Ti_(3)C_(2) MXene-based QCM humidity ***,the high mechanical modulus of Ti_(3)C_(2) MXene material helped ND/Ti_(3)C_(2)MXene composite-coated QCM humidity sensor to achieve a high quality factor(>20,000).ND/Ti_(3)C_(2)MXene compositecoated QCM humidity sensor exhibited a sensitivity of 82.45 Hz/%RH,a humidity hysteresis of 1.1%RH,fast response/recovery times,acceptable repeatability,and good stability from 11.3%RH to 97.3%*** response mechanism of ND/Ti_(3)C_(2) MXene composite-coated QCM humidity sensor was analyzed in combination with a bi-exponential kinetic adsorption ***,the potential application of ND/Ti_(3)C_(2)MXene composite-coated QCM humidity sensor was demonstrated through its frequency response to wooden blocks with different moisture contents.

关键词： Humidity sensor Quartz crystal microbalance Nanodiamond Ti_(3)C_(2)MXene High quality factor

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Orthogonal isometric projection for face recognition

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The Journal of China Universities of Posts and Telecommunications 2011年第1期18卷 91-97,128页

作者： LU Guan-ming ZUO jia-kuo College of Communication and Information Engineering Nanjing University of Posts and Telecommunications Nanjing 210003 China

Isometric projection （IsoProjection） is a linear dimensionality reduction method, which explicitly takes into account the manifold structure embedded in the data. However, IsoProjection is non-orthogonal, which makes it extremely sensitive to the dimensions of reduced space and difficult to estimate the intrinsic dimensionality. The non-ortbogonality also distorts the metric structure embedded in the data. This paper proposes a new method called orthogonal isometric projection （O-IsoProjection）, which shares the same linear character as IsoProjection and overcomes the metric distortion problem of IsoProjection. Similar to IsoProjection, O-lsoProjection firstly constructs an adjacency graph which can reflect the manifold structure embedded in the data and the class relationship between the sample points of face space, and then obtains the projections by preserving such a graph structure. Different from IsoProjection, O-IsoProjection requires the basis vectors to be orthogonal, and the orthogonal basis vectors can be calculated by iterative way. Experimental results on ORL and Yale databases show that O-lsoProjection has better recognition rate for face recognition than Eigenface, Fisherface and IsoProjection.

关键词： lsoProjection O-IsoProjection face recognition dimensionality reduction

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Thermal shock behavior of ZrB2-SiC ceramics with different quenching media

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Frontiers of Materials Science 2013年第2期7卷 184-189页

作者： chang-An WANG ming-Fu WANG State Key Lab of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing 100084 China Science and Technology on Scramjet Laboratory Beijing 100074 China

The thermal shock behavior of ZrB2-SiC ceramics was studied with water, air and methyl silicone oil as quenching media, respectively. The temperature of all coolants was room temperature （25℃） and the residual strength of the ceramics after quenching was tested. The strength of the ceramics after water quenching had an obvious drop when the temperature difference, AT, was about 275℃, while the residual strength of the specimens quenched by air and silicone oil only varied a little and even increased slightly when the temperature difference was higher than 800℃. The different thermal conductive coefficient of the coolants and surface heat transfer coefficient resulted in the differences in the thermal shock behavior. The formation of oxidation layer was beneficial for improving the residual strength of the ceramics after quenching.

关键词： ultra-high temperature ceramic (UHTC) zirconium diboride (ZrB2) siliconcarbide (SIC) thermal shock resistance mechanical property

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An Effective Eigenchannel R-Matrix Method for Calculating Electron-Ion Scattering Processes with Spectroscopic Precision

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Chinese Physics Letters 2012年第3期29卷 71-74页

作者： GAO Xiang LI jia-ming Beijing Computational Science Research Center Beijing 100084 Key Laboratory for Laser Plasmas(Ministry of Education)and Department of Physics Shanghai Jiao Tong UniversityShanghai 200240 Department of Physics and Center for Atomic and Molecular Nanosciences Tsinghua UniversityBeijing 100084

The electron-ion scattering processes are very important in various scientific research fields such as astrophysical studies and inertial confinement fusion *** report our recent development of an efficient method for providing such atomic data with spectroscopic *** on the Breit-Pauli and the Dirac R-matrix theory,we develop two eigenchannel R-matrix codes,referred to as R-eigen(non-relelativistic eigenchannel R-matrix)and R-R-eigen(relativistic eigenchannel R-matrix),to directly calculate the physical quantities in multichannel quantum defect theory in the whole energy *** such physical quantities,we can obtain all energy levels and the related scattering cross sections with accuracies comparable with spectroscopic *** e+Kr+system is used as an illustration example,the degrees of accuracies of scattering matrices are calculated within about 2%,which should be much more accurate than state-of-the-art scattering experiments.

关键词： quantities spectroscopic illustration

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Sugar-dependent targeting and immune adjuvant effects of hyperbranched glycosylated polypeptide nanoparticles for ovalbumin delivery

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Chinese Chemical Letters 2022年第8期33卷 4084-4088页

作者： Yingying Song chang-ming Dong School of Chemistry and Chemical Engineering Shanghai Key Laboratory of Electrical Insulation and Thermal AgingShanghai Jiao Tong UniversityShanghai 200240China

Sugar-dependent targeting and immune adjuvant effects of hyperbranched glycosylated polypeptide nanoparticles were disclosed for ovalbumin(OVA)delivery *** mannose-coated polypeptide nanoparticles can induce strongest targeting and immune adjuvant effects to macrophages than those glucose/lactose-coated ones,which effectively transported OVA into cells and facilitated OVA subcellular escape from endolysosomes into cytoplasm with the assistance of UV irradiation or intracellular acidic pH.

关键词： Polypeptide nanoparticles Sugar targeting Immune adjuvant Ovalbumin delivery system

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Theoretical Simulation of the Transmission Spectra of Fe and Ge Plasmas

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Chinese Physics Letters 2000年第3期17卷 194-196页

作者： YAN Jun LI jia-ming Center of Atomic and Molecular Sciences Department of PhysicsTsinghua UniversityBeijing 100084 Institute of Physics Chinese Academy of SciencesBeijing 100080

Using the detailed conGguration accounting with the term structures treated by the unresolved transition array model,we present a method to calculate the transmission spectra of hot dense *** to the fully relativistic treatment,incorporated with the quantum defect theory to calculate the atomic parameters of the huge number of conGgurations with high principal quantum number,we can study the opacities for any middle-and high-Z plasmas with much less computational *** can also conveniently identify the dominant configurations and the detailed features of transition arrays,which are very helpful for the diagnostic of the plasma *** accuracy of our theoretical model is tested by comparing the calculated transmission spectra of Fe and Ge plasmas with the bench mark experimental data.

关键词： conditions. quantum transition

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Functional Separable Solutions of Nonlinear Heat Equations in Non-Newtonian Fluids

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Communications in Theoretical Physics 2008年第2期49卷 257-262页

作者： GOU ming QU chang-Zheng Center for Nonlinear Studies Northwest University Xi＇an 710069 China Department of Mathematics Northwest University Xi＇an 710069 China

We study the functional separation of variables to the nonlinear heat equation： ut = （A（x）D（u）ux^n）x＋ B（x）Q（u）, Ax≠0. Such equation arises from non-Newtonian fluids. Its functional separation of variables is studied by using the group foliation method. A classification of the equation which admits the functional separable solutions is performed. As a consequence, some solutions to the resulting equations are obtained.

关键词： group foliation method functional separation of variable nonlinear heat equation symmetry group

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Relativistic Channel Theory: Abnormal Fine Structures of n^(2)D Rydberg States for Alkali Atoms

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Chinese Physics Letters 2001年第10期18卷 1334-1336页

作者： XIA Dan LI jia-ming Center for Atomic and Molecular Nanosciences Department of PhysicsTsinghua UniversityBeijing 100084 Institute of Physics:Chinese Academy of Sciences Beijing 100080

Based on relativistic channel theory, we have studied the fine structures of n^(2)D Rydberg states for alkali atoms. We explain the abnormal fine structures owing to the competition effect of the spin-orbit interactio... 详细信息

关键词： Rydberg relativistic Alkali

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Improvement of LCM model and determination of model parameters at watershed scale for flood events in Hongde Basin of China

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Water Science and Engineering 2017年第1期10卷 36-42页

作者： Jun Li chang-ming Liu Key Laboratory of Mountain Hazards and Earth Surface Processes Institute of Mountain Hazards and EnvironmentChinese Academy of Sciences Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of Sciences

Considering the fact that the original two-parameter LCM model can only be used to investigate rainfall losses during the runoff period because the initial abstraction is not included, the LCM model was redefined as a three-parameter model, including the initial abstraction coefficient l, the initial abstraction Ia, and the rainfall loss coefficient R. The improved LCM model is superior to the original two-parameter model, which only includes r and R, where r is the initial rainfall loss index and can be calculated with l using the Soil Conservation Service curve number （SCS-CN） method, with r = 1/（1 ＋ λ）. The trial method was used to determine the parameter values of the improved LCM model at the watershed scale for 15 flood events in the Hongde Basin in China. The results show that larger r values are associated with smaller R values, and the parameter R ranges widely from 0.5 to 2.0. In order to improve the practicability of the LCM model, r = 0.833 with λ = 0.2 is reasonable for simplifying calculation. When the LCM model is applied to arid and semi-arid regions, rainfall without yielding runoff should be deducted from the total rainfall for more accurate estimation of rainfall-runoff.

关键词： LCM model SCS-CN method Rainfall-runoff Initial abstraction Partial-area runoff Determination of parameter Loess Plateau

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Diophantine equations and Fermat's last theorem for multivariate(skew-)polynomials

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Applied Mathematics(A Journal of Chinese Universities) 2024年第1期39卷 159-173页

作者： PAN Jie jia Yu-ming LI Fang School of Mathematical Sciences Zhejiang UniversityHangzhou 310058China Henan Experimental High School Zhengzhou 450003China

Fermat’s Last Theorem is a famous theorem in number theory which is diﬃcult to ***,it is known that the version of polynomials with one variable of Fermat’s Last Theorem over C can be proved very *** aim of this paper is to study the similar problems about Fermat’s Last Theorem for multivariate(skew)-polynomials with any characteristic.

关键词： Fermat's last theorem polynomial ring skew polynomial ring

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