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SGformer:Boosting transformers for indoor lighting estimation from a single image

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Computational Visual Media 2024年第4期10卷 671-686页

作者： Junhong Zhao bing xue Mengjie Zhang Centre for Data Science and Artificial Intelligence&School of Engineering and Computer Science Victoria University of WellingtonWellington 6012New Zealand

Estimating lighting from standard images can effectively circumvent the need for resourceintensive high-dynamic-range(HDR)lighting ***,this task is often ill-posed and challenging,particularly for indoor scenes,due to the intricacy and ambiguity inherent in various indoor illumination *** propose an innovative transformer-based method called SGformer for lighting estimation through modeling spherical Gaussian(SG)distributions—a compact yet expressive lighting *** from previous approaches,we explore underlying local and global dependencies in lighting features,which are crucial for reliable lighting ***,we investigate the structural relationships spanning various resolutions of SG distributions,ranging from sparse to dense,aiming to enhance structural consistency and curtail potential stochastic noise stemming from independent SG component *** harnessing the synergy of local–global lighting representation learning and incorporating consistency constraints from various SG resolutions,the proposed method yields more accurate lighting estimates,allowing for more realistic lighting effects in object relighting and *** code and model implementing our work can be found at https://***/junhong-jennifer-zhao/SGformer.

关键词： lighting estimation transformer spherical Gaussian(SG) augmented reality

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综放开采下煤层底板采动破坏深度预测

煤炭技术 2025年第1期44卷 7-10页

作者：薛冰鲁海峰安徽理工大学地球与环境学院安徽淮南232063

以淮南顾北煤矿12121工作面为工程研究背景,收集了22个综放工作面地质资料和底板破坏深度实测值,通过线性回归分析建立新的预测模型,得出了底板采动破坏深度的拟合公式,准确计算出底板采动破坏的深度,并将计算值及3个传统统计公式计算... 详细信息

以淮南顾北煤矿12121工作面为工程研究背景,收集了22个综放工作面地质资料和底板破坏深度实测值,通过线性回归分析建立新的预测模型,得出了底板采动破坏深度的拟合公式,准确计算出底板采动破坏的深度,并将计算值及3个传统统计公式计算结果与现场实测值进行对比分析,得出新预测模型拟合公式比传统统计公式预测精度更高、误差更小,更接近实测值,基本可以满足现场需要。研究成果对淮南矿区煤层综放开采水害防治具有较高的实用价值,为类似工作面的水害防治提供更为科学的依据。

关键词：综放开采底板突水拟合公式底板采动破坏深度

Comptonization and Reprocessing Processes in Accretion Disks: Applications to the Seyfert 1 Galaxies NGC 5548 and NGC 4051

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Chinese Journal of Astronomy and Astrophysics 2006年第2期6卷 165-174页

作者： Fan Zhang xue-bing Wu Department of Astronomy Peking University Beijing 100871

Simultaneous multi-wavelength observations have revealed complex variability in AGNs. To explain the variability we considered a theoretical model consisting of an inner hot comptonizing corona and an outer thin accretion disk, with interactions between the two components in the form of comptonization and reprocessing. We found that the variability of AGNs is strongly affected by the parameters of the model, namely, the truncated disk radius rmin, the corona radius rs, the temperature KTe and the optical depth TO of the corona. We applied this model to the two best observed Seyfert 1 galaxies, NGC 5548 and NGC 4051. Our model can reproduce satisfactory the observed SEDs. Our fits indicate that NGC 5548 may have experienced dramatic changes in physical parameters between 1989-1990 and 1998, and that NGC 4051 has a much larger truncated disk radius （700 Schwarzschild radii） than NGC 5548 （several tens of Schwarzschild radii）. Since we adopted a more refined treatment of the comptonization process rather than simply assuming a cut-off power law, our results should be more reasonable than the previous ones.

关键词： accretion - accretion disks - galaxies: active - galaxies: individual (NGC 5548 NGC 4051) - galaxies: Seyfert - X-rays: galaxies

Radio Identifications of Markarian Galaxies and the Correlation between Radio and Far-Infrared Properties

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Chinese Journal of Astronomy and Astrophysics 2005年第5期5卷 448-456页

作者： Shao-Guang Luo xue-bing Wu Department of Astronomy Peking University Beijing 100871 Shenzhen Graduate School Peking University Shenz-hen 518055

By checking DSS optical images and NVSS radio images, 782 Markarian galaxies were identified to be NVSS radio sources. A comparison of the radio luminosity at 1.4GHz and the far-infrared （FIR） luminosity for 468 “normal” galaxies shows a tight correlation. Most of the Seyfert galaxies and quasars follow the radio-FIR relation deduced from the “normal” galaxy sample, but with a somewhat larger scatter. A total 167 Markarian galaxies, comprising 100 “normal” galaxies, 66 Seyfert galaxies and one quasar, have either excess radio emission or much lower FIR spectral index α（25 μm, 60 μm）. These galaxies may be classified as “AGN-powered”. For “normal” galaxies, the average q value （defined as the log ratio between FIR and radio luminosities） is 2.3. There seems a trend for q to slightly decrease with increasing radio luminosity. This may imply that the ongoing active star formation in galaxies with higher radio luminosities is more efficient in heating the cosmic-ray electrons.

关键词： galaxies: active - galaxies: Seyfert - galaxies: starburst - radio continuum: galaxies - infrared: galaxies

Synthesis of a New Type of Amphilic and Water - soluble Tertiary Phosphine Ligands Substituted by an Ethoxylated Phosphonic Acid Chain and Their Palladium Complexes

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Chinese Chemical Letters 2002年第9期13卷 839-842页

作者： Xiang Kai FU xue bing MA College of Chemistry and Chemical Engineering Southwest-China Normal UniversityChongqing 400715

The highly water-soluble phosphine ligands Na2O3PCH2CH2NH(CH2CH2O)nCH2CH2N- (CH2PPh2)2 (n=1,2,3) were prepared by a new and simple route under mild conditions in good yield; the palladium (II) complexes of the ligands... 详细信息

关键词： Water-soluble diphenylphosphinomethyl phosphine ligands palladium complexes synthesis.

Effects of the Northeast China Revitalization Strategy on Regional Economic Growth and Social Development

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Chinese Geographical Science 2020年第5期30卷 791-809页

作者： REN Wanxia xue bing YANG Jun LU Chengpeng Key Laboratory of Pollution and Environment Engineering Institute of Applied EcologyChinese Academy of SciencesShenyang 110016China Key Lab for Environmental Computation and Sustainability of Liaoning Province Shenyang 110016China Ji-angho Architecture Northeastern UniversitShenyang 110016China Institute for County Economy Developments&Rural Revi-talization Strategy Lanzhou UniversityLanzhou 730000China

Measuring the economic and social effects of the Northeast China Revitalization Strategy is critical to addressing regional sustainable development in China. To shed light on this issue, an integrated perspective was adopted that is combined with the difference-in-differences method to measure the effects of the strategy on economic growth and social development in Northeast China. The findings suggest that the strategy has significantly improved regional economic growth and per-capita income by increasing its gross domestic product(GDP) and GDP per capita by 25.70% and 46.00%, respectively. However, the strategy has significantly worsened the regional employment in the secondary industry of the region. In addition, the strategy has not significantly improved regional infrastructural road, education investment or social security, and has had no significant effect on mitigating regional disparity. In addition, the policy effects are highly heterogeneous across cities based on city size and characteristics. Therefore, there is no simple answer regarding whether the Northeast China Revitalization Strategy has reached its original goals from an integrated perspective. The next phase of the strategy should emphasize improving research and development(R&D) and human capital investments based on urban heterogeneity to prevent conservative path-dependency and the lock-in of outdated technologies.

关键词： policy evaluation difference-in-differences(DID)method regional disparity urban heterogeneity regional revitalization old industrial base Northeast China

A Novel Fusion Forecast Model for Hail Weather in Plateau Areas Based on Machine Learning

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Journal of Meteorological Research 2021年第5期35卷 896-910页

作者： Yan ZHANG Zhong JI bing xue Ping WANG School of Electrical and Information Engineering Tianjin UniversityTianjin 300072 Public Meteorological Service Center China Meteorological AdministrationBeijing 100081

In order to improve the accuracy of hail forecasting for mountainous and plateau areas in China,this study presents a novel fusion forecast model based on machine learning ***,known mechanisms of hail formation and two newly proposed elevation features calculated from radar data,sounding data,automatic station data,and terrain data,are firstly combined,from which a hail/short-duration heavy rainfall(SDHR)classification model based on the random forest(RF)algorithm is built ***,we construct a hail/SDHR probability identification(PI)model based on the Bayesian minimum error decision and principal component analysis ***,an"and"fusion strategy for coupling the RF and PI models is *** addition to the mechanism features,the new elevation features improve the models’performance *** results show that the fusion strategy is particularly notable for reducing the number of false alarms on the premise of ensuring the hit rate.A comparison with two classical hail indexes shows that our proposed algorithm has a higher forecasting accuracy for hail in mountainous and plateau *** 19 hail cases used for testing could be identified,and our algorithm is able to provide an early warning for 89.5%(17 cases)of hail cases,among which 52.6%(10 cases)receive an early warning of more than 42 minutes in *** PI model sheds new light on using Bayesian classification approaches for highdimensional solutions.

关键词： hail identification hail warning random forest Bayesian minimum error decision fusion strategy

NUMERICAL SIMULATION OF HYDRODYNAMIC CHARACTERISTICS ON AN ARC CROWN WALL USING VOLUME OF FLUID METHOD BASED ON BFC

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Journal of Hydrodynamics 2011年第6期23卷 767-776页

作者： LI xue-yan REN bing WANG Guo Yu WANG Yong-xue State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian 116023China

In the present study, a new algorithm based on the Volume Of Fluid （VOF） method is developed to simulate the hydrodynamic characteristics on an arc crown wall. Structured grids are generated by the coordinate transform method in an arbitrary complex region. The Navier-Stokes equations for two-dimensional incompressible viscous flows are discretized in the Body Fitted Coordinate （BFC） system. The transformed SIMPLE algorithm is proposed to modify the pressure-velocity field and a transformed VOF method is used to trace the free surface. Hydrodynamic characteristics on an arc crown wall are obtained by the improved numerical model based on the BFC system （BFC model）. The velocity field, the pressure field and the time profiles of the water surface near the arc crown wall obtained by using the BFC model and the Cartesian model are compared. The BFC model is verified by experimental results.

关键词： Body Fitted Coordinate (BFC) SIMPLE scheme Volume Of Fluid (VOF) method arc crown wall staggered grid

Effect of sintering temperature on the microstructure and thermal conductivity of Al/diamond composites prepared by spark plasma sintering

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International Journal of Minerals,Metallurgy and Materials 2010年第2期17卷 234-240页

作者： Ke Chu Cheng-chang Jia xue-bing Liang Hui Chen School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

Spark plasma sintering was used to fabricate Al/diamond *** effect of sintering temperature on the microstructure and thermal conductivity（TC） of the composites was investigated with the combination of experimental results and theoretical *** composite sintered at 550℃shows high relative density and strong interfacial bonding,whereas the composites sintered at lower（520CC） and higher（580-600℃） temperatures indicate no interfacial bonding and poor interfacial bonding,*** relative density and strong interfacial bonding can maximize the thermal conductivity of Al/diamond composites,and taking both effects of particle shape and inhomogeneous interfacial thermal conductance into consideration can give a fairly good prediction of composites＇ thermal conduction properties.

关键词： metal matrix composites thermal properties spark plasma sintering interface