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1st International Conference of Urban Climate, Sustainability, and Urban Design, UCSUD 2023

作者： Gao, Yuejing Zhao, Jingyuan Han, Li School of Architecture and Civil Engineering Xi’an University of Science and Technology Shaanxi Xi’an710054 China School of Architecture Chang’an University Shaanxi Xi’an710054 China Geological Resources and Geological Engineering Postdoctoral Research Station Xi’an University of Science and Technology Shaanxi Xi’an710054 China

ISBN: (纸本)9789819784004

In the post-epidemic era and extreme climate context, the study of urban health development, especially the urban thermal environment, has increasingly received extensive attention. In this paper, using Web of Science Core Collection as data sources, we analyzed the relevant literature in the field of urban thermal environment research during 1990–2019 by using scientific knowledge mapping and bibliometric method. It is found that the research in this field tends to be diversified and integrated, and the observation methods are gradually transitioning from field measurements to numerical simulation combined with field measurements. Furthermore, the focus tends to be on the quantitative studies of the urban thermal environment combined with the corresponding response mechanism for the planning action, which is shifting from passive adaptation to active governance. In the future, the research on adaptation planning under the role of urban microclimate especially thermal environment, the quantitative indicators, and dynamic collaborative planning methods will be the focus of research in this field. © The Author(s) 2025.

关键词： Anthropogenic

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Analytical time-like geodesics in modified Hayward black hole space-time

arXiv

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arXiv 2021年

作者： Hu, Jian-Ping Shi, Li-Li Zhang, Yu Duan, Peng-Fei Faculty of Science Kunming University of Science and Technology KunmingYunnan650500 China Geological Resources and Geological Engineering Postdoctoral Programme Kunming University of Science and Technology KunmingYunnan650093 China

The properties of modified Hayward black hole space-time can be investigated through analyzing the particle geodesics. By means of a detailed analysis of the corresponding effective potentials for a massive particle, we find all possible orbits which are allowed by the energy levels. The trajectories of orbits are plotted by solving the equation of orbital motion numerically. We conclude that whether there is an escape orbit is associated with b (angular momentum). The properties of orbital motion are related to b, α (α is associated with the time delay) and β (β is related to 1-loop quantum corrections). There are no escape orbits when b Copyright © 2021, The Authors. All rights reserved.

关键词： Angular momentum

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Structure of geodesics in the regular Hayward black hole space-time

arXiv

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arXiv 2021年

作者： Hu, Jian-Ping Zhang, Yu Shi, Li-Li Duan, Peng-Fei Faculty of Science Kunming University of Science and Technology KunmingYunnan650500 China Geological Resources and Geological Engineering Postdoctoral Programme Kunming University of Science and Technology KunmingYunnan650093 China City College Kunming University of Science and Technology KunmingYunnan650051 China

The regular Hayward model describes a non-singular black hole space-time. By analyzing the behaviors of effective potential and solving the equation of orbital motion, we investigate the time-like and null geodesics in the regular Hayward black hole space-time. Through detailed analyses of corresponding effective potentials for massive particles and photons, all possible orbits are numerically simulated. The results show that there may exist four orbital types in the time-like geodesics structure: planetary orbits, circular orbits, escape orbits and absorbing orbits. In addition, when , a convenient encoding of the central energy density 3/8π2, is 0.6M, and b is 3.9512M as a specific value of angular momentum, escape orbits exist only under b > 3.9512M. The precession direction is also associated with values of b. With b = 3.70M the bound orbits shift clockwise but counter-clockwise with b = 5.00M in the regular Hayward black hole space-time. We also find that the structure of null geodesics is simpler than that of time-like geodesics. There only exist three kinds of orbits (unstable circle orbits, escape orbits and absorbing orbits). Copyright © 2021, The Authors. All rights reserved.

关键词： Orbits

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Geodesic Structure of a Non-linear Magnetic Charged Black Hole Surrounded by Quintessence

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Communications in Theoretical Physics 2019年第10期71卷 1187-1195页

作者： Li-Li Shi Jian-Ping Hu Yu Zhang Chen Ma Peng-Fei Duan Faculty of Science Kunming University of Science and TechnologyKunming650500China Geological Resources and Geological Engineering Postdoctoral Programme University of Science and TechnologyKunming650093China City College Kunming University of Science and TechnologyKunming650051China

This paper aims to investigate the geodesic motion in the spacetime of a non-linear magnetic charged black hole surrounded by quintessence. By varying the Lagrangian corresponding to the metric, the orbital motion equation has been obtained. The effects of the magnetic charge Q, positive normalization factor C, angular momentum b, and energy E on time-like and null geodesic motion are discussed from three aspects: orbital stability, orbital types, and circular orbits. By comparing the effects of the above parameters C, b on the effective potential, it is found that quintessence has an impact on the types and stability of orbits. In addition, for time-like orbital motion, when 3.443113 ≤ b ≤ 6.392 578(for fixed C = 0.0002, M = 1, Q = 0.7), there are bound orbits, and within this range, the stable circular orbits exist,and the radii of the innermost and outermost stable circular orbit are r = 5.912 654 and r = 56.745 933, respectively. For null orbital motion, the orbital types have only unstable circular orbit which occur at r = 2.951 072(E2= E22= 0.4),absorb orbits and escape orbits, but no stable circular orbits, and bound orbits.

关键词： effective potential orbital stability orbital types

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Influence of nano materials on strength characteristics and microstructure of red clay 7

Influence of nano materials on strength characteristics and ...

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7th International Symposium on Project Management, ISPM 2019

作者： Chen, Xuejun Li, Jiaming Zhou, Zihan Bai, Hanying College of Civil Engineering and Architecture Guilin University of Technology Guilin541004 China Guangxi Key Laboratory of Geotechnical Mechanics and Engineering Guilin541004 China School of Mechanics and Civil Engineering China University of Mining and Technology Beijing10008 China Geological Resources and Geological Engineering Postdoctoral Station Guilin University of Technology Guilin541004 China

ISBN: (纸本)9781921712692

To explore nanometer materials on the strength of red clay characteristic and the influence of the microstructure, choose the nano graphite, nano bentonite, nano CaCO3 three kinds of nanometer materials as admixture mixed with the red clay, through the triaxial test, electron microscope and mercury injection experiment with different initial dry density under the condition of mechanical properties of the blended material were studied. The results showed that the change of mechanical strength of red clay doped with ghanaian rice was closely related to the effect of nano-materials on the cementation and pore structure of red clay, nano-graphite powder and nano-bentonite enhanced the mechanical properties of red clay, and nano CaCO3 weakened the mechanical properties of red clay. © 2019 by Aussino Academic Publishing House.

关键词： Graphite

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Research on the Bionic Non-Smooth Nozzle for High-Pressure Jet Grouting Based on Computational Fluid Dynamics

Research on the Bionic Non-Smooth Nozzle for High-Pressure J...

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2019 2nd International Conference on Sustainable Energy, Environment and Information engineering(SEEIE 2019)

作者： Jiwei Wen College of Environment and Civil Engineering Center for Postdoctoral Studies of Geological Resources and Geological Engineering State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of Technology

In the practical engineering, high-pressure jet grouting(HPJG) has been widely used for reinforcing the soil mass and preventing seepage in the many different fields. Nozzle is the crucial component for HPJG, its hydraulic characteristics determine the working efficiency of HPJG directly. The bionic non-smooth technology is applied to design the nozzle's internal structure. According to the computational fluid dynamics(CFD) to compare the hydraulic characteristics of the normal nozzle and the bionic non-smooth nozzle, comparing the values of impact forces of high-pressure cement-slurry jets impact on the soil mass surfaces ejected by them, the value of bionic non-smooth nozzle is 17.05 N bigger than the normal nozzle. The relevant results show that the bionic non-smooth nozzle has better hydraulic characteristics. In addition, the grooves with equal intervals on the inner walls make the nozzle with a non-smooth surface. Moreover, the opposite rotational vortexes in the grooves on the inner walls of the bionic non-smooth nozzle are the main reason for increasing efficiency and reducing energy consumption.

关键词： High-pressure jet grouting bionic non-smooth nozzle CFD

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A Novel and High-Efficiency Reaming Assembly for Underground Pipelines Pulling Back Laying in Horizontal Directional Drilling

A Novel and High-Efficiency Reaming Assembly for Underground...

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2019 International Conference on Energy, Environmental and Civil engineering(EECE 2019)

作者： Ji-wei WEN College of Environment and Civil Engineering Center for Postdoctoral Studies of Geological Resources and Geological Engineering State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of Technology

In recent years, the available urban ground space is less and less with the rapid development of economy and urban infrastructure construction. Thus, the rational utilization and development of urban underground space is gradually becoming the focus of the world. Trenchless technology is a great invention to effectively resolve the various subsurface pipelines investigation, laying, rehabilitation and replacement without digging ground. In which, horizontal directional drilling is a kind of method to achieve the subsurface pipelines with the different diameters laying. In this study, a novel and high-efficiency reaming assembly for underground pipelines pulling back laying is presented. It mainly combines torque impactor or hydraulic impactor, several cutting circular rings with gradually decreased diameters, nozzles and sealing connector. It cuts and breaks rock by the means of percussion rotary jet drilling, resulting in the smooth implementation of trenchless pipeline laying, especially in the rock strata.

关键词： Trenchless technology Horizontal directional drilling High-efficiency reaming assembly Underground pipelines installation

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Study on the Mechanism of High-Pressure Jet Grouting Based on Computational Fluid Dynamics

Study on the Mechanism of High-Pressure Jet Grouting Based o...

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2019 International Conference on Applied Mathematics, Modeling, Simulation and Optimization(AMMSO 2019)

High-pressure jet grouting(HPJG) is an effective method to reinforce soil mass and to prevent seepage in the practical engineering. It has been used in the different fields for many years, and achieved the significant social and economic benefits. In this study, the processes and mechanisms of HPJG are discussed based on the computational fluid dynamics(CFD). The related results show that it is a good way to reveal the processes and mechanisms of HPJG. Using the suitable injection pressure and flow rate, nozzle structure and velocity of nozzle movement are the effective ways to increase the working efficiency of HPJG. Moreover, the effects of impacting, cutting, mixing, lifting, replacing, filling, extrusion, permeation, concretion, displacement and packing are the main mechanisms of HPJG.

关键词： High-pressure jet grouting Mechanism Nozzle CFD

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Sustainability assessment of groundwater in south-eastern parts of the western region of Ghana for water supply

Cleaner Water

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Cleaner Water 2024年 1卷

作者： Ernest Biney Bernard Akwasi Mintah Ernest Ankomah Albert Elikplim Agbenorhevi Daniel Buston Yankey Ernestina Annan Department of Geomatic Engineering Kwame Nkrumah University of Science and Technology University Post Office Box PMB Kumasi Ghana WASCAL Graduate Research Programme on Climate Change and Land Use Department of Civil Engineering Kwame Nkrumah University of Science and Technology Kumasi Ghana Department of Geological Engineering University of Mines and Technology Tarkwa Ghana Graduate Research Program on Climate Change and Water Resources West African Science Service Center on Climate Change and Adapted Land Use (WASCAL) University of Abomey-Calavi Benin

The study assessed the physicochemical and biological properties of selected groundwater sources in the Southeastern part of the Western Region, to assess the impact on water quality and health risk. The Piper Trilinear plot was used to categorize the water samples into water types based on the dominant anion and cation concentrations. Statistical analysis (One way ANOVA and two sample t-test) was used to determine the sources of variation in the data at 95% confidence interval. The Water Quality Index (WQI) and Hazard Quotient (HQ) were used to estimate the water quality and health risk respectively. TDS and turbidity were above the acceptable WHO guidelines in 16.7% of the samples with a mildly acidic pH in 83.3% of the water samples. Also, 91.7% of the water samples were contaminated with total coliform (TC) and 25% with e-coli. Generally, the groundwater samples were dominated by Ca 2+ and HCO 3- ion water types. The variations between parameters were found not significant for all the parameters (p>0.05). Water samples in the North are of good quality with a mean WQI of 96, but of poor quality in the South with a mean WQI of 144.6. HQ values for all the samples were less than 0.1, suggesting less harmful impacts of the heavy metal concentrations on human health. Overall, the results showed the presence of heavy metals in the groundwater sources sampled, however in quantities with low health risks either through oral or dermal channels. Groundwater within the communities is good for domestic purposes but needs treatment for drinking. To improve upon the study, it is recommended that further studies consider a higher number of samples and include other accessible groundwater stations where possible.

关键词： Health Risk Assessment Groundwater GIS Trace elements Water Quality Index

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Influence of Nano Materials on Strength Characteristics and Microstructure of Red Clay

Influence of Nano Materials on Strength Characteristics and ...

引用

第七届工程管理国际学术研讨会

作者： Xuejun CHEN Jiaming LI Zihan ZHOU Hanying BAI College of Civil Engineering and Architecture Guilin University of Technology Guangxi Key Laboratory of Geotechnical Mechanics and Engineering School of Mechanics and Civil Engineering China University of Mining and Technology Geological Resources and Geological Engineering Postdoctoral Station Guilin University of Technology

To explore nanometer materials on the strength of red clay characteristic and the influence of the microstructure, choose the nano graphite, nano bentonite, nano CaCO three kinds of nanometer materials as admixture mixed with the red clay, through the triaxial test, electron microscope and mercury injection experiment with different initial dry density under the condition of mechanical properties of the blended material were studied. The results showed that the change of mechanical strength of red clay doped with ghanaian rice was closely related to the effect of nano-materials on the cementation and pore structure of red clay, nano-graphite powder and nano-bentonite enhanced the mechanical properties of red clay, and nano CaCO weakened the mechanical properties of red clay.

关键词： nano materials red clay mechanical property microstructure

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