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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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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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Parameter estimation for rigid body after micro-Doppler removal based on L-statistics in the radar analysis

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Journal of Systems Engineering and Electronics 2015年第3期26卷 457-467页

作者： Yong Wang jian kang School of Electronics and Information Engineering Harbin Institute of Technology

In traditional inverse synthetic aperture radar （ISAR） imaging of moving targets with rotational parts, the micro-Doppler （m-D） effects caused by the rotational parts influence the quality of the radar images. Recently, L. Stankovic proposed an m-D removal method based on L-statistics, which has been proved effective and simple. The algorithm can extract the m-D effects according to different behaviors of signals induced by rotational parts and rigid bodies in time-frequency （T-F） domain. However, by removing m-D effects, some useful short time Fourier transform （STFT） samples of rigid bodies are also extracted, which induces the side lobe problem of rigid bodies. A parameter estimation method for rigid bodies after m-D removal is proposed, which can accurately re- cover rigid bodies and avoid the side lobe problem by only using m-D removal. Simulations are given to validate the effectiveness of the proposed method.

关键词： parameter estimation L-statistics micro-Doppler (m-D) radar imaging.

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Feasibility study on heap bioleaching of chalcopyrite

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Rare Metals 2013年第5期32卷 524-531页

作者： Bo-Wei Chen jian-kang National Engineering Laboratory of Biohydrometallurgy General Research Institute for Nonferrous Metals

Bioleaching of chalcopyrite often encountered the formation of passivation layer, which inhibited the leaching process and resulted in a low leaching rate. This inhibitory effect can be eliminated by thermophilic biole- aching. The industrial test of BioCOP technology based on thermophiles was successfully completed, which confirmed the feasibility of chalcopyrite bioleaching. However, industrial leaching rate of chalcopyrite heap bioleaching is lower. This paper described the development status and industrial test of chalcopyrite heap bioleaching technology. The reasons for the lower efficiency of chalcopyrite heap bioleaching were analyzed. The strategies for successful chalcopyrite heap bioleaching were proposed.

关键词： Chalcopyrite Heap bioleaching Thermophiles Pyrite Feasibility

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Assessment and simulation of evacuation in large railway stations

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Building Simulation 2021年第5期14卷 1553-1566页

作者： Yue Wu jian kang Jingyi Mu Key Laboratory of Cold Region Urban and Rural Human Settlement Environment Science and Technology School of ArchitectureHarbin Institute ofTechnologyNo.66 WestDazhi StreetHarbin 150001China UCL Institute for Environmental Design and Engineering The BartlettUniversity College LondonLondonUK

Evacuation systems in buildings are frequently assessed to improve emergency response *** paper proposes a method to evaluate the performance of different evacuation modes,and determine a rational mode for large railway *** developed a simulation for the evaluation of fire safety in large buildings based on an analytic hierarchy process(AHP)*** approach includes AHP-based exploration and simulation-based *** considered a typical railway station for validation,conducted a field survey to collect the data,and calculated the influencing factors based on expert *** influencing factors were further processed based on the principles of a hierarchical *** relative weights of the influencing factors were calculated through a series of pairwise comparisons using the ***,we applied factor refinement based on the evacuation simulations to determine the degree and status of influence of each *** influence of external factors was generally stronger than that of the internal *** them,the building component characteristics and people's physiological capabilities were the core of the evacuation assessment in large railway ***,the exit width,seat layout,visibility,speed,and reaction capabilities were crucial to the evacuation *** proposed method is practical as it demands limited computations to provide useful information,such as a priority ranking of each influencing factor,for the evaluation process.

关键词： analytic hierarchy process risk analysis large railway station evacuation simulation

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Steel-refractory reactions in lanthanum-,cerium-,and ytrium-added steels

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Journal of Iron and Steel Research International 2024年第6期31卷 1473-1485页

作者： jian kang Hong-po Wang Yu Wang College of Materials Science and Engineering Chongqing UniversityChongqing 400044China The State Key Laboratory of Mechanical Transmissions Chongqing UniversityChongqing 400044China

A systematic experimental study was conducted on the similarities and differences in the reactions between commonly used rare earth elements(REEs)and frequently used refractories in the steelmaking *** results indicate that the reaction behaviors of La,Ce,and Y with MgO,Al_(2)O_(3),and MgO·Al_(2)O_(3) crucibles differed *** consumption rates of La,Ce,and Y in the molten steel were in descending order of La>Ce>Y for smelting with all three kinds of *** the REEs reacted with the crucible,the contents of Mg and Al showed a trend of first increasing and then *** laboratory-scale smelting conditions,the reactions related to REEs were dominated by steel-crucible reactions,and the contact area between the unit mass of molten steel and refractory materials mainly determined the consumption rates of ***-and Ce-crucible reactions generated loose and porous reaction interfaces;however,Y-crucible reactions generated a dense Y_(2)O_(3) layer,dramatically suppressing the consumption rate of *** calculation indicated that the reactions between rare earth and different refractory materials were first-order *** crucible materials significantly affected the product type and morphology of the steel-crucible reaction interfaces,thereby influencing the consumption rate of *** reactions between REEs and refractories must be seriously considered,especially for small-scale smelting.

关键词： Rare earth Inclusion Refractory Thermodynamics Dynamics

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An Autophosphorylation Site of the Protein Kinase SOS2 Is Important for Salt Tolerance in Arabidopsis

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Molecular Plant 2009年第1期2卷 183-190页

作者： Hiroaki Fujii jian-kang Zhu Department of Botany and Plant Sciences 2150 Batchelor Hall University of California Riverside CA 92521 USA

The protein kinase SOS2 （Salt Overly Sensitive 2） is essential for salt-stress signaling and tolerance in Arabidopsis. SOS2 is known to be activated by calcium-SOS3 and by phosphorylation at its activation loop. SOS2 is autophosphorylated in vitro, but the autophosphorylation site and its role in salt tolerance are not known. In this study, we identified an autophosphorylation site in SOS2 and analyzed its role in the responses of Arabidopsis to salt stress. Mass spectrometry analysis showed that Ser 228 of SOS2 is autophosphorylated. When this site was mutated to Ala, the autophosphorylation rate of SOS2 decreased. The substrate phosphorylation by the mutated SOS2 was also less than that by the wild-type SOS2. In contrast, changing Ser228 to Asp to mimic the autophosphorylation enhanced substrate phosphorylation by SOS2. Complementation tests in a sos2 mutant showed that the S228A but not the $228D mutation partially disrupted the function of SOS2 in salt tolerance. We also show that activation loop phosphorylation at Thr168 and autophosphorylation at Ser228 cannot substitute for each other, suggesting that both are required for salt tolerance. Our results indicate that Ser 228 of SOS2 is autophosphorylated and that this autophosphorylation is important for SOS2 function under salt stress.

关键词： SOS2 autophosphorylation salt tolerance protein kinase Arabidopsis

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Micro RNAs and Short-interfering RNAs in Plants

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Journal of Integrative Plant Biology 2007年第6期49卷 817-826页

作者： Ramanjulu Sunkar jian-kang Zhu Department of Biochemistry and Molecular Biology Oklahoma State University Stillwater OK 74078 USA Department of Botany and Plant Sciences University of California Riverside CA 95251 USA

Gene silencing can occur either at the transcriptional level or post-transcriptional level or both. Many instances of sequence-specific silencing requires small RNAs that can be divided into two major classes： microRNAs （miRNAs） and short-interfering RNAs （siRNAs）. miRNAs function in post-transcriptional gene silencing by guiding mRNA degradation or translational repression, Endogenous siRNAs are more diverse in plants than in animals and can direct post-transcriptional gene silencing through mRNA degradation or transcriptional gene silencing by trigger- ing DNA methylation and histone modifications. This review discusses recent advances in the field of small RNA- guided gene silencing in plants including rice.

关键词： gene silencing microRNAs short-interfering RNAs plants.

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Micro-Macro Scale Relationship in Creep Deformation of Ultra High Molecular Weight Polyethylene

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Chinese Journal of Polymer Science 2021年第12期39卷 1665-1672页

作者： Bi-Jin Xiong Zhen-Xian Chen jian kang Key Laboratory of Materials Chemistry for Energy Conversion and Storage(HUST)of Ministry of Education School of Chemistry and Chemical EngineeringHuazhong University of Science and Technology(HUST)Wuhan 430074China State Key Laboratory of Polymer Materials Engineering Polymer Research Institute of Sichuan UniversityChengdu 610065China

Macroscopic and microscale creep deformations of UHMWPE were investigated by using in situ SAXS.A methodology for the measurement of the local creep deformation of inter-lamellar amorphous phase has been *** local strain of inter-lamellar amorphous phase(£a)and macroscopic strain(£macro)were evaluated and they were compared to study the relati on ship betwee n macroscopic and microscale creep deformation of *** of them exhibit two deformation regions against creep *** entanglements show a strong impact on both the macroscopic and local inter-lamellar amorphous phase creep behavior and they can be well correlated to the molecular weight between two entanglements estimated from strain-hardening *** to the macroscopic creep deformation,local inter-lamellar amorphous layers have a smaller creep *** the local creep measurement,the apparent modulus of inter-lamellar amorphous phase can also be estimated(200

关键词： Ultra-high molecular weight polyethylene Creep Small angle X-ray scattering Microscale

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Mechanism of Mg2+ dissolution from olivine and serpentine: Implication for bioleaching of high-magnesium nickel sulfide ore at elevated pH

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International Journal of Minerals,Metallurgy and Materials 2019年第9期26卷 1069-1079页

作者： jian-zhi Sun jian-kang Wen Bo-wei Chen Biao Wu National Engineering Laboratory of Biohydrometallurgy GRINM Group Corporation Limited

To inhibit the dissolution of Mg^2+ during the bioleaching process of high-magnesium nickel sulfide ore, the effect of major bioleaching factors on the dissolution of Mg^2+ from olivine and serpentine was investigated and kinetics studies were carried out. The results indicated that the dissolution rate-controlling steps are chemical reaction for olivine and internal diffusion for serpentine. The most influential factor on the dissolution of Mg^2+ from olivine and serpentine was temperature, followed by p H and particle size. A novel method of bioleaching at elevated pH was used in the bioleaching of Jinchuan ore. The results showed that elevated pH could significantly reduce the dissolution of Mg^2+ and acid consumption along with slightly influencing the leaching efficiencies of nickel and cobalt. A model was used to explain the leaching behaviors of high-magnesium nickel sulfide ore in different bioleaching systems. The model suggested that olivine will be depleted eventually, whereas serpentine will remain because of the difference in the rate-controlling steps. Bioleaching at elevated pH is a suitable method for treating high-magnesium nickel sulfide ores.

关键词： olivine serpentine high-magnesium nickel sulfide ore bioleaching shrinking core model elevated pH

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