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Simplified prediction models for acoustic installation effects of train-mounted equipment

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Railway Engineering Science 2024年第2期32卷 125-143页

作者： David Thompson Dong zhao Giacomo Squicciarini Institute of Sound and Vibration Research University of SouthamptonSouthampton SO171BJUK

Acoustic models of railway vehicles in standstill and pass-by conditions can be used as part of a virtual certification process for new *** each piece of auxiliary equipment,the sound power measured on a test bench is combined with meas-ured or predicted transfer *** is important,however,to allow for installation effects due to shielding by fairings or the train *** the current work,fast-running analytical models are developed to determine these installation *** model for roof-mounted sources takes account of diffraction at the corner of the train body or fairing,using a barrier *** equipment mounted under the train,the acoustic propagation from the sides of the source is based on free-field Green’s *** bottom surfaces are assumed to radiate initially into a cavity under the train,which is modelled with a simple diffuse field *** sound emitted from the gaps at the side of the cavity is then assumed to propagate to the receivers according to free-field Green’s *** show good agreement with a 2.5D boundary element model and with *** uncertainty and parametric uncertainty are *** largest variability occurs due to the height and impedance of the ground,especially for a low *** leads to standard deviations of up to 4 dB at low *** the roof-mounted sources,uncertainty over the location of the corner used in the equivalent barrier model can also lead to large standard deviations.

关键词： Train noise Auxiliary equipment Acoustic installation effects Virtual certification Uncertainty

Quantum Statistical Properties of the Exciton in a Leaky Quasi-Mode Cavity

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Communications in Theoretical Physics 2002年第7期38卷 81-84页

作者： YU zhao-Xian JIAO Zhi-Yong Theoretical Physics Division Nankai Institute of Mathematics Nankai University Tianjin 300071 China Department of Physics Petroleum University (East China) Dongying 257061 Shandong Province China Department of Physics Petroleum University (East China) Dongying 257061 Shandong Province China

We have studied quantum statistical properties of the exciton in a leaky quasi-mode cavity. It is shown that when the exciton is initially in a squeezed coherent state whereas cavity initially in a vacuum state, there is energy exchange between the exciton and cavity. Both the exciton and cavity may exhibit sub-Poissonian distribution and exist quadrature squeezing. Calculation shows that correlation between the exciton and cavity is classical, which implies that there is not the violation of the Cauchy-Schwartz inequality.

关键词： sub-Poissonian distribution, quadrature squeezing, exciton, a leaky quasi-mode cavity

China needs long-term solutions for African Swine Fever

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Science Bulletin 2019年第20期64卷 1469-1471页

作者： Jun zhao zhaohai Bai Lin Ma Key Laboratory of Agricultural Water Resources Hebei Key Laboratory of Soil EcologyCenter for Agricultural Resources ResearchInstitute of Genetic and Developmental BiologyChinese Academy of SciencesShijiazhuang 050021China School of Social and Public Administration East China University of Science and TechnologyShanghai 200237China

African Swine Fever(ASF)has received a lot of public concerns in and outside of China(1)Currently,more than 1 million head of pigs have been culled,and the stocking number of fattening pigs and sows has been reported reduced by more than 20%(Fig.1a,b),and the price of pork has been increased by around 30%compared with the same period in 2018(Fig.1c).ASF in China has also had a significant impact on the world meat market,due to its huge contribution to global pig production.

关键词： pro China needs long-term solutions for African Swine Fever ASF

CO adsorption on metal doped 2D InSe:Mechanism and application

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Progress in Natural Science:Materials International 2019年第3期29卷 305-309页

作者： Chenxu zhao Wang Gao Qing Jiang Key Laboratory of Automobile Materials Ministry of EducationDepartment of Materials Science and EngineeringJilin University

A novel-type material based on metal doped 2D InSe (M@2DInSe) has been proposed for CO *** results reveal that the conventional Blyholder mechanism can be applicable to M@2DInSe systems,and the charge transfer between CO and M@2DInSe can serve as an effective measurement for the adsorption energy of *** M@2DInSe,the response of electronic structures towards CO adsorption is also strongly correlated with the adsorption energy of CO,demonstrating an apparent metal-to-insulator transition for Fe@2DInSe and Mo@2DInSe under the influence of CO *** findings provide a new material-design scheme to detect CO molecules and promising candidates for further experimental studies.

关键词： Se CO adsorption on metal doped 2D InSe:Mechanism and application

A polysaccharide/tetraphenylethylene-mediated blue-light emissive and injectable supramolecular hydrogel

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Chinese Chemical Letters 2018年第1期29卷 84-86页

作者： Qian zhao Yong Chen Yu Liu College of Chemistry State Key Laboratory of Elemento-Organie Chemistry Nankai University tianjin 300071 China Collaborative Innovation Center of Chemical Science and Engineering (tianjin) Nankai University Tianjin 300071 China

A luminescent and injectable supramolecular hydrogel was successfully constructed through the non- covalent cross-linking of polymers mediated by tetraphenylethylene-bridged cyclodextrin oligomers, presenting the strong blue fluorescence, the reversible gelation behavior responsive to various external stimuli and the good mechanical property of shear thinning.

关键词： Tetraphenylethylene Supramolecular Emissive Injectable Hydrogel

Designing interstitial boron-doped tunnel-type vanadium dioxide cathode for enhancing zinc ion storage capability

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Carbon Energy 2023年第8期5卷 78-86页

作者： Shiwen Wang Hang Zhang Kang zhao Wenqing Liu Nairui Luo Jianan zhao Shide Wu Junwei Ding Shaoming Fang Fangyi Cheng Henan Provincial Key Laboratory of Surface&Interface Science College of Materials and Chemical EngineeringZhengzhou University of Light IndustryZhengzhouChina Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) College of ChemistryNankai UniversityTianjinChina

Chemical doping is a powerful method to intrinsically tailor the electrochemical properties of electrode ***,an interstitial boron-doped tunnel-type VO_(2)(B)is constructed via a facile hydrothermal *** analysis techniques demonstrate that boron resides in the interstitial site of VO_(2)(B)and such interstitial doping can boost the zinc storage kinetics and structural stability of VO_(2)(B)cathode during ***,we found that the boron doping level has a saturation limit peculiarity as proved by the quantitative ***,the 2 at.%boron-doped VO_(2)(B)shows enhanced zinc ion storage performance with a high storage capacity of 281.7 mAh g^(-1) at 0.1 A g^(-1),excellent rate performance of 142.2 mAh g^(-1) at 20 A g^(-1),and long cycle stability up to 1000 cycles with the capacity retention of 133.3 mAh g^(-1) at 5 A g^(-1).Additionally,the successful preparation of the boron-doped tunneltype α-MnO_(2) further indicates that the interstitial boron doping approach is a general strategy,which supplies a new chance to design other types of functional electrode materials for multivalence batteries.

关键词： cathode interstitial boron doping tunnel-type VO_(2)(B) zinc ion battery

Co/Zn-metal organic frameworks derived functional matrix for highly active amorphous Se stabilization and advanced lithium storage

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Rare Metals 2023年第1期42卷 76-84页

作者： Hong Yu Jin-zhao Kang Long-Sheng Huang Jin-Jin Wang Xiao-Mei Wang Xiang-Yuan zhao Cheng-Feng Du State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi’an710072China Northwestern Polytechnical University Chongqing Technology Innovation Center Chongqing400000China College of Chemistry and Chemical Engineering Hubei UniversityWuhan430062China

Lithium-selenium batteries,as an advanced rechargeable battery system,have attracted wide ***,its application is hurdled by the ambiguous underlying mechanism such as the unclear active phase and the key role of the host ***,a three-dimensional(3D) functional matrix derived from the Co/Znmetal organic framework is synthesized to unravel the questions *** reveals that the strong interaction and voids in the 3D matrix serve to anchor the amorphous Se with high electrochemical *** obtained 3DC/Se exhibits 544.2 and 273.2 mAh·g^(-1) t current densities of 0.1C and 2.0C,respectively,with a diffusion-controlled *** excessive amount of Se beyond the loading capacity of the matrix leads to the formation of trigonal phase Se,which shows an unsatisfying electrochemical property.

关键词： Metal-organic frameworks(MOFs) Amorphous Se Functional matrix Li-Se batteries

A Facile and Efficient Synthesis of N,N-Dimethylarylamines from Aryl Bromides

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Chinese Chemical Letters 2002年第12期13卷 1149-1151页

作者： Jian Kui zhao Yan Guang WANG Department of Chemistry Zhejiang UniversityHangzhou 310027

Catalytic amination of aryl bromides with in situ generated dimethylamines from N, N- dimethylacetamide (DMA) has been successfully carried out using Ni(Phen)Cl2 as catalyst. Both electron-rich and electron-poor aroma... 详细信息

关键词： Amination nickel-catalyzed cross-coupling reaction N, N-dimethylarylamine.

INVESTIGATION OF NITROGEN CONTENT INFLUENCE ON ELECTRON SPIN RESONANCE IN a-Si:H/a-SiN_(x):H MULATLATYERS

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Chinese Physics Letters 1990年第2期7卷 79-82页

作者： LIU Xiangna zhao Zhouyin WANG Yong Physics Department Laboratory for Solid State MicrostructuresNanjing UniversityNanjing210008 Institute of Electronic Devices Nanjing210008

Influence of nitrogen content on electron spin resonance(ESR)in a-Si:H/a-SiN_(x):H multilayers is studied,associated with infrared absorption *** spin density decreases rapidly in the region x>~0.7 and approaches a saturated value,which is much less than common *** results are explained in terms of the structure relaxation due to the increase of N-H bonds with increasing x and the transfer doping across interfaces.

关键词： analysis. relaxation