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Development of acoustic computer simulation for performance spaces: A systematic review and meta-analysis

Building Simulation 2022年第10期15卷 1729-1745页

作者： Chao Wang Jian kang School of Architecture Tianjin UniversityTianjin 300072China UCL Institute for Environmental Design and Engineering The BartlettUniversity College London(UCL)Central House14 Upper Woburn PlaceLondon WC1H0NNUK

This article aims to review the development of acoustic computer simulation for performance spaces. The databases of Web of Science and Scopus were searched for peer-reviewed journal articles published in English between 1960 and 2021, using the keywords for “simulation”, “acoustic”, “performance space”, “measure”, and their synonyms. The inclusion criteria were as follows: (1) the searched article should be focused on the field of room acoustics (reviews were excluded);(2) a computer simulation algorithm should be used;(3) it should be clearly stated that the simulated object is a performance space;and (4) acoustic measurements should be used for comparison with the simulation. Finally, twenty studies were included. A standardised data extraction form was used to collect the modelling information, software/algorithm, indicators for comparison, and other information. The results revealed that the most used acoustic indicators were early decay time (EDT), reverberation time (T30), strength (G), and definition (D50). The accuracy of these indicators differed greatly. For non-iterative simulation, the simulation accuracies of most indicators were outside their respective just noticeable differences. Although a larger sample size was required for further validation, simulations of T30, EDT, and D50 all showed an increase in accuracy with increasing time from 1979 to 2020, except for G. In terms of frequency, the simulation was generally less accurate at lower frequencies, which occurred at T30, G, D50 and T20. However, EDT accuracy did not exhibit significant frequency sensitivity. The prediction accuracy of inter-aural cross-correlation coefficients (IACC) was even higher at low frequencies than it was at high frequencies. The average value of most indicators showed a clear systematic deviation from zero, providing hints for future algorithm improvements. Limitations and the risks of bias in this review were discussed. Finally, various types of benchmark tests were sug

关键词： acoustic simulation accuracy systematic review performance space iterative simulation

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Fatigue Life Prediction for NiTi Shape Memory Alloy Micro-tubes Under Uniaxial Stress-Controlled One-Way Shape Memory Cyclic Loading

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Acta Mechanica Solida Sinica 2022年第1期35卷 15-25页

作者： Tianxing Zhao Guozheng kang Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province School of Mechanics and EngineeringSouthwest Jiaotong UniversityChengdu 610031China Institute of Applied Mechanics State Key Laboratory of Traction PowerSouthwest Jiaotong UniversityChengdu 610031China

By choosing the dissipation energy as the damage variable,corresponding damage evolution equations are established,respectively,for the mechanical cyclic loading part and the thermal one during the thermo-mechanical cyclic loading of NiTi shape memory alloys(SMAs)involving one-way shape memory effect(simply denoted as the OWSME cycling).And then,the evolution law of total damage is obtained by a superposition of such two damage ***,the uniaxial OWSME fatigue lives of NiTi SMA micro-tubes are predicted by combining the proposed damage model with an adopted failure *** results show that all the predicted fatigue lives are located within the twice scatter band with regard to the experimental ones,and most of them are located within a scatter band of 1.5 *** is indicated that the predicted OWSME fatigue lives are in good agreement with the experimental ones.

关键词： NiTi shape memory alloy One-way shape memory effect Damage evolution Fatigue life prediction Uniaxial loading

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A dispersed vegetative cover contributes to urban biodiversity:plant diversity across land use types and scale in an Asian city

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Journal of Forestry Research 2023年第2期34卷 539-551页

作者： Jiefeng kang Shozo Shibata Laboratory of Landscape Ecology and Planning Graduate School of Global Environmental StudiesKyoto UniversityKyotoJapan

Urbanization provides both challenges and opportunities for biodiversity conservation,but patterns of urban plant diversity across land uses,especially in Asian countries,remains *** determine these patterns of diversity,woody plants in 174 sample quadrats across various land use types in Kyoto City were ***,abundance,and evenness were evaluated at city,land use,and quadrat scales,and biodiversity of different land use types was *** the city level,223 species in 77 families were *** the land use level,residential areas had the highest total biological richness,with moderate to low evenness,while commercial areas exhibited low *** the quadrat level,the low-rise residential area had higher species richness than the other land *** abundance and evenness in quadrats were significantly different across land use types for the canopy layer but not for the *** results provide insights into urban biodiversity design and management by identifying prior land uses for biodiversity improvement and by highlighting the contribution of residential private *** heterogeneity,scale,and multidimensionality should be considered when measuring urban biodiversity.

关键词： Urban biodiversity Woody plants Land uses Residential areas Japan

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Thermal comfort in winter incorporating solar radiation effects at high altitudes and performance of improved passive solar design-Case of Lhasa

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Building Simulation 2021年第6期14卷 1633-1650页

作者： Lingjiang Huang Jian kang Department of Architecture Wuhan UniversityWuhan 430072China UCL Institute for Environmental Design and Engineering The BartlettUniversity College London(UCL)London WC1H 0NNUK

The solar incidence on an indoor environment and its occupants has significant impacts on indoor thermal *** can bring favorable passive solar heating and can result in undesired overheating(even in winter).This problem becomes more critical for high altitudes with high intensity of solar irradiance,while received limited *** this study,we explored the specific overheating and rising thermal discomfort in winter in Lhasa as a typical location of a cold climate at high ***,we evaluated the thermal comfort incorporating solar radiation effect in winter by field ***,we investigated local occupant adaptive responses(considering the impact of direct solar irradiance).This was followed by a simulation study of assessment of annual based thermal comfort and the effect on energy-saving potential by current solar ***,we discussed winter shading design for high altitudes for both solar shading and passive solar use at high altitudes,and evaluated thermal mass shading with solar louvers in terms of indoor environment *** results reveal that considerable indoor overheating occurs during the whole winter season instead of summer in Lhasa,with over two-thirds of daytime beyond the comfort ***,various adaptive behaviors are adopted by occupants in response to overheating due to the solar ***,it is found that the energy-saving potential might be overestimated by 1.9 times with current window to wall ratio requirements in local design standards and building codes due to the thermal adaption by drawing *** developed thermal mass shading is efficient in achieving an improved indoor thermal environment by reducing overheating time to an average of 62.2% during the winter and a corresponding increase of comfort time.

关键词： thermal comfort overheating passive solar design high altitude Tibet solar shading

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Deep-ultraviolet nonlinear optical crystals: concept development and materials discovery

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Light(Science & Applications) 2022年第8期11卷 1718-1729页

作者： Lei kang Zheshuai Lin Functional Crystals Lab Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing100190China

Deep-ultraviolet (DUV, wavelength λ < 200 nm) nonlinear optical (NLO) crystal is the core component of frequency conversion to generate DUV laser, which plays an important role in cutting-edge laser technology and fundamental science. Significant progress has been made in both experimental exploration and theoretical design in the field of DUV NLO crystals over the past three decades. In-depth insight into “structure-property correlations”, in particular, allows for rigorous and precise identification of DUV NLO crystals. In this article, we reviewed the current experimental and theoretical research progress while elucidating the core concepts and stringent criteria of qualified DUV phase-matched second-harmonic generation crystals. We also discussed the development of the DUV NLO “structure-property correlations” from first principles and how it has sparked interest in related materials, as well as future directions for obtaining potential DUV NLO crystals.

关键词： optical ultraviolet Deep

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Transient process of methane-oxygen diffusion flame-street establishment in a microchannel

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Frontiers in Energy 2022年第6期16卷 988-999页

作者： Xin kang Yu WANG School of Civil Engineering and Architecture Wuhan University of TechnologyWuhan 430070China School of Automotive Engineering Wuhan University of TechnologyWuhan 430070China

“Flame-street”is an interesting diffusion flame behavior in which a series of flame-segments is separately distributed along the mixing layer in a narrow *** experimental phenomenon was experimentally and numerically investigated with the focus on the steady-state,thermo-chemical flame structures in previous *** the present paper,the dynamic formation process of a methane-oxygen diffusion flame-street structure was simulated with a reacting flow solver developed based on the open-source framework *** imposing a certain amount of ignition-energy near the channel outlet,a reaction-kernel was formed and ***,three separate flames were consecutively generated from this kernel and propagated within the *** whole process was completed within 15 ms and all the discrete flames were eventually in a ***,different propagation features were observed for the three flame segments:The leading flame experienced a flame shape/type change from a tribrachial structure in its fastpropagating phase to a long,trailing diffusion tail after being anchored to the *** successive flame had a much lower propagation speed,keeping its two wing-like(fuel-lean premixed and fuel-rich premixed)structure while moving toward its stabilization location,which was approximately in the middle of the *** last flame,after the ignition source was turned-off,was immediately convected a bit downstream,and eventually featured a similar two-branch-like structure as the second ***,chemical insights for the premixed and diffusion branches of the leading flame were also provided with the change of significance of some key elementary reactions focused on,in order to attain a detailed profiling of the flame-type *** paper is a first-ever one discussing the transient formation of flame-streets in literature and is believed to be useful for obtaining a comprehensive understanding of this unique flame characte

关键词： micro-combustion flame-street diffusion flame mixing layer flame propagation speed

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A study on neural mechanism of face processing based on fMRI

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Progress in Natural Science:Materials International 2008年第2期18卷 201-207页

作者： kang Lee Canada Institute of Child Study University of Toronto

Recently,there were debates about the specificity of lateral middle fusiform in face processing. The debates focused on whether these areas were specialized in face processing or involved in processing of visual expertise and categorization at individual level. The present study aims to investigate the neural mechanism of face processing,using Chinese characters as comparison stimuli. Chinese characters are greatly similar to faces on a variety of dimensions,among which the most significant one is that both faces and Chinese characters not only are extremely familiar to literate Chinese adults but also are processed at individual level. In the present study,faces and Chinese characters activated bilateral middle fusiform with great correlation. Greater activities were observed in the right fusiform face area (FFA) for faces than for Chinese characters. These results demonstrate that FFA is specialized in face processing per se rather than the processing of visual expertise and categorization at individual level.

关键词： Face processing Chinese characters Fusiform gyrus fMRI

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Review on fatigue life prediction models of welded joint

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Acta Mechanica Sinica 2020年第3期36卷 701-726页

作者： Guozheng kang Huiliang Luo Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province School of Mechanics and EngineeringSouthwest Jiaotong UniversityChengdu 610031China Institute of Applied Mechanics State Key Laboratory of Traction PowerSouthwest Jiaotong UniversityChengdu 610031China

Fatigue assessment of welded joint is still far from being completely solved now,since many influencing factors coexist and some important ones should be considered in the developed life prediction models ***,such influencing factors of welded joint fatigue are firstly summarized in this work;and then,the existing life prediction models are reviewed from two aspects,i.e.,uniaxial and multiaxial ones;finally,significant conclusions of existing experimental and theoretical researches and some suggestions on improving the fatigue assessment of welded joints,especially for the low-cycle fatigue with the occurrence of ratchetting,are provided.

关键词： Welded joint High-cycle fatigue Low-cycle fatigue Influencing factors Life prediction models

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Combinatorial principles between RRT2 2 and RT2 2

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Frontiers of Mathematics in China 2014年第6期9卷 1309-1323页

作者： Xiaojun kang School of Philosophy and Sociology Jilin University Changchun 130012 China Institute of Logic and Cognition Sun Yat-sen University Guangzhou 510275 China

We study the strength of some combinatorial principles weaker than Ramsey theorem for pairs over RCA0. First, we prove that Rainbow Ramsey theorem for pairs does not imply Thin Set theorem for pairs. Furthermore, we get some other related results on reverse mathematics using the same method. For instance, Rainbow Ramsey theorem for pairs is strictly weaker than ErdSs- Moser theorem under RCA0.

关键词： Reverse mathematics thin set free set ErdSs-Moser theorem,Rainbow Ramsey theorem

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CONTACT ALGORITHMS FOR CONTACT DYNAMICAL SYSTEMS

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Journal of Computational Mathematics 1998年第1期16卷 1-14页

作者： kang Feng 中科院计算数学与科学工程计算所北京

In this paper, we develop a general way to construct contact algorithms for contact dynamical systems. Such an algorithm requires the corresponding step transition map preserve the contact structure of the underlying contact phase space. The constructions are based on the correspondence between the contact geometry of R2n+1 and the conic symplectic one of R2n+2 and therefore, the algorithms are derived naturally from the symplectic algorithms of Hamiltonian systems.

关键词： contact algorithms contact systems conic symplectic geometry generating functions

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