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Influence of Ultra Fine Glass Powder on the Properties and Microstructure of Mortars

Fluid Dynamics & Materials Processing 2024年第5期20卷 915-938页

作者： Wei Chen Dingdan Liu Yue Liang School of Civil Engineering Architecture and EnvironmentHubei University of TechnologyWuhan430068China

This study focuses on the effect of ultrafine waste glass powder on cement strength,gas permeability and pore *** contents were considered,with particle sizes ranging from 2 to 20μ***,alkali activation was considered to ameliorate the reactivity and cementitious properties,which were assessed by using scanning electron microscopy(SEM),energy-dispersive X-ray spectroscopy(EDS),and specific surface area pore size distribution *** to the results,without the addition of alkali activators,the performance of glass powder mortar decreases as the amount of glass powder increases,affecting various aspects such as strength and resistance to gas *** 5%glass powder mortar demonstrated a compressive strength at 60 days higher than that of the control ***,adding alkali activator(CaO)during hydration ameliorated the hydration environment,increased the alkalinity of the composite system,activated the reactivity of glass powder,and enhanced the interaction of glass powder and pozzolanic *** general,compared to ordinary cement mortar,alkali-activated glass powder mortar produces more hydration products,showcases elevated density,and exhibits improved gas ***,alkali-activated glass powder mortar demonstrates an improvement in performance across various aspects as the content *** a substitution rate of 15%,the glass powder mortar reaches its optimal levels of strength and resistance to gas permeability,with a compressive strength increase ranging from 28.4%to 34%,and a gas permeation rate reduction between 51.8%and 66.7%.

关键词： Mortar waste glass powder alkali activation compressive strength gas permeability pore structure

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An Investigation into the Compressive Strength,Permeability and Microstructure of Quartzite-Rock-Sand Mortar

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Fluid Dynamics & Materials Processing 2024年第4期20卷 859-872页

作者： Wei Chen Wuwen Liu Yue Liang School of Civil Engineering Architecture and EnvironmentHubei University of TechnologyWuhan430068China

River sand is an essential component used as a fine aggregate in mortar and *** to unrestrained exploitation,river sand resources are gradually being *** requires alternative *** study deals with the properties of cement mortar containing different levels of manufactured sand(MS)based on quartzite,used to replace river *** river sand was replaced at 20%,40%,60%and 80%with MS(by weight or volume).The mechanical properties,transfer properties,and microstructure were examined and compared to a control group to study the impact of the replacement *** results indicate that the compressive strength can be improved by increasing such a *** strength was improved by 35.1%and 45.5%over that of the control mortar at replacement levels of 60%and 80%,*** there was a weak link between porosity and gas permeability in the mortars with manufactured sand,the gas permeability decreased with growing the replacement *** microstructure of the MS mortar was denser,and the cement paste had fewer microcracks with increasing the replacement level.

关键词： Manufactured sand quartzite compressive strength gas permeability microstructure

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DEVELOPMENT OF DAYLIGHT DEVICE WITH VARIABLE OPTICAL PROPERTIES USING NEAR-INFRARED ABSORBING REFLECTORS

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AIJ Journal of technology and Design 2025年第77期31卷 317-321页

作者： Ito, Daisuke Shinohara, Naoko Dept. of Architecture Faculty of Architecture NIPPON Institute of Technology Japan Dept. of Architecture and Building Engineering School of Architecture and Urban Planning Tokai Univ Japan

The purpose of this study is to develop a daylight device with variable optical properties using near-infrared absorbing reflectors that can provide adequate solar radiation shielding or solar heat utilization during daylight use throughout the year. By using a thermal barrier coating agent, a near-infrared absorbing reflector with high visible reflectance and low solar reflectance was created. The results of the light duct model experiment showed that daylight could be taken in stably, and solar radiation could be taken in at the solar altitude in the winter and shielded at the solar altitude in the summer. © 2025 Architectural Institute of Japan. All rights reserved.

关键词： Thermal barrier coatings

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Error Analysis of A New Higher Order Boundary Element Method for A Uniform Flow Passing Cylinders

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China Ocean engineering 2023年第3期37卷 369-377页

作者： SUN Shi-yan CUI Jie BAO Chao-ming School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China

A higher order boundary element method(HOBEM)is presented for inviscid flow passing cylinders in bounded or unbounded *** traditional boundary integral equation is established with respect to the velocity potential and its normal *** present work,a new integral equation is derived for the tangential *** boundary is discretized into higher order elements to ensure the continuity of slope at the element *** velocity potential is also expanded with higher order shape functions,in which the unknown coefficients involve the tangential *** expansion then ensures the continuities of the velocity and the slope of the boundary at element *** extensive comparison of the results for the analytical solution of cylinders,it is shown that the present HOBEM is much more accurate than the conventional BEM.

关键词： higher order boundary element method(HOBEM) error analysis integral equations for potential and velocity cylinders

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Reduction behavior of iron ore powder by high-volatile coal in thermogravimetric-gas chromatographic and kinetic analysis

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Journal of Iron and Steel Research International 2024年第1期31卷 92-107页

作者： Rui-meng Shi Qi-yuan Mi Bin Li Xiao Shi Chong Zou Jing Guo Han-jie Guo School of Metallurgical Engineering Xi’an University of Architecture and TechnologyXi’an710055ShaanxiChina China International Engineering Consulting Corporation Beijing100048China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing100083China

The reduction behavior of iron ore powder by high-volatile coal was investigated,and its kinetic mechanism was *** effect of volatiles in coal on the reduction reaction of iron ore was compared by utilizing a Xinjiang lignite with a high volatile content and its pyrolysis carbon produced by high-temperature pyrolysis to remove volatiles,serving as a *** mass loss and gas composition of the samples during the reduction process were detected using thermo-gravimetric analysis and gas chromatography,and the morphological changes of iron ore powder were observed through scanning electron *** kinetic parameters of the iron oxide reduction reaction were calculated by the Flynn-Ozawa-Wall method,and the kinetic mechanism of volatile participation in the iron oxide reduction reaction was determined through the Coats-Redfern *** results indicate that the coupling effect between the high-volatile coal pyrolysis and reduction reactions occurs during the second stage of the entire coupling process,which corresponds to the late stage of coal pyrolysis with a substantial release of H_(2)and *** volatiles in coal actively participated in the reduction reaction,reducing the initiation temperature of the reaction by around 200℃.The reduction of iron oxides by high-volatile coal was jointly promoted by the"hydrogen cycle"and"carbon cycle",resulting in a higher reduction extent and metallization rate at the end of the *** high-volatile coal was used as the reductant,the average activation energy for the entire process was 76.5 kJ/mol,a significant decrease compared to the employment of pyrolysis carbon without volatiles as the reductant(1167 kJ/mol).

关键词： Direct reduction High-volatile coal Volatile Kinetics Reduction mechanism

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Analysis of Ship Motion in An Ice Ridge Field Based on Empirical Approach

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China Ocean engineering 2023年第6期37卷 912-922页

作者： SONG Ming YUAN Wei LIU Kun HAN Yue School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China

The estimation of ship speed in ice ridge fields is important for both route planning and prediction of emergency response *** analytical method for estimating ship motion in first-year ice ridge is developed based on ice resistance models and ship motion equations,in which the effect of ship speed on ridge resistance is taken into *** model tests in level ice and one model test in ice ridge for an icebreaking multipurpose vessel are used to validate and benchmark the presented *** predicted results including level ice resistances,net thrust and ship motion in the ice ridge field are compared with the model test *** comparisons show that the presented method can generate reasonable *** effects of input parameters on ship speed,penetration depth and number of necessary rams to transit ridge have been *** on the calibrated model,insights into the ice resistance and the ship motion are *** is found that the energy consumption of the keel obtained by integral calculation of the keel resistance at the penetration distance is with the same magnitude as the result of the maximum keel resistance multiplied by the ridge *** addition,the effect of ridge width and keel depth on keel resistance and average transit speed is investigated.

关键词： ice ridge ice resistance model tests average transit speed

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Diffusion characteristics of oxygenic–thermal coupled airflow in high-altitude sleeping environment

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Building Simulation 2024年第10期17卷 1749-1765页

作者： Cong Song Xiaohui Li Yanfeng Liu Longxiang Gao State Key Laboratory of Green Building Xi’an University of Architecture and TechnologyXi’anShaanxi 710055China School of Building Services Science and Engineering Xi’an University of Architecture and TechnologyXi’anShaanxi 710055China

About 1/3 of human life is spent *** hypoxic and cold environment in high-altitude areas leads to sleep disorders that are more prominently harmful to the human *** improve the quality of human sleep in high-altitude areas,this study explored the thermal and oxygen environment regulation for plateau *** this study,the influencing factors of the diffusion of oxygenic–thermal coupled airflow were determined through the theoretical analysis of a thermal fluid mechanic *** study used computational fluid dynamics(CFD)to investigate the diffusion characteristics of the oxygenic–thermal coupled airflow with a sleeping experiment conducted on the *** results showed that the influence of the thermal plume at 0.1 m near the human face was larger,and the oxygenic–thermal coupled airflow diffusion process was mainly divided into three phases over *** size and time to stabilize the oxygen volume fraction in the inhalation zone varied between conditions and were strongly influenced by the temperature difference of the supply *** effects of the thermal and oxygen environment were analyzed using indicators such as facial-area speed ratio,draft risk,and personal oxygen inhalation *** optimal design strategies were recommended with an outlet air velocity of 1.5 m/s,a temperature difference of 8 K between the outlet airflow and the indoor background air,and an outlet oxygen volume fraction of 30%.The results can provide implications for regulating the thermal and oxygen environment to improve human sleep quality in high-altitude areas.

关键词： high altitudes oxygenic–thermal coupled airflow sleep environment CFD method

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Semantic Comprehension Method for Chinese Sentences Based on Minimal Semantic Structures and Its Application

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Chinese Journal of Electronics 2023年第3期32卷 613-624页

作者： WEN Hao HE Qianru School of Information and Control Engineering Xi'an University of Architecture Technology

The importance of small Chinese sentences is no less than that of sentences, which is an inherent feature of Chinese itself. According to this characteristic, this paper proposes a sentence semantic understanding method for Chinese scientific and technological abstracts based on the minimum semantic structure. Firstly,a conceptual model was established for identifying the minimum semantic structure of a sentence based on a corpus of verbs, relative words, prepositions and markers based on Language technology Planform(LTP) ***, the model was used to extract the minimum semantic structure of abstract sentence. Finally, three experiments were carried out, namely, the classification of the abstract sentences, knowledge graph generation and automatic semantic inference discovery. Our study confirmed the practical value of the small Chinese *** experimental results show that the effect of using small sentences to understand the semantics of Chinese text is better than that of the full stop sentence, and the minimum semantic structure can be used as the basic unit of the Chinese sentence semantic comprehension. This method is conducive in the automatic understanding of the basic semantics of sentences in unstructured Chinese science and technology text sentences.

关键词： Semantics Knowledge graphs Computer applications Big Data Feature extraction Grammar Task analysis

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Collision behaviors of binary charged oil droplets in agglomeration pretreatment for purification

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Building Simulation 2025年第1期18卷 87-98页

作者： Qingfeng Cao Yang Yang Ningbin Zhu Yi Wang Yong Cui Kangning Xiong Yuming Zhang Sikang Li Xin Wang Fei Wang State Key Laboratory of Green Building Xi’an University of Architecture and Technology710055Xi’anChina School of Building Services Science and Engineering Xi’an University of Architecture and Technology710055Xi’anChina University of Shanghai for Science and Technology 200093ShanghaiChina

Purification of oil droplets is crucial for enhancing air quality in machining ***,the small particle size and high purification resistance of oil droplets present *** agglomeration pretreatment technology,which leverages strong inter-particle forces,improves the purification efficiency of small particles without increasing the resistance of purification equipment,showing significant application *** study numerically investigates the effectiveness of electricity agglomeration influenced by physical parameters(surface tension,droplet diameter)and collision parameters(collision velocity,collision angle)of oil *** indicate that surface tension and collision velocity are critical *** surface tension exceeds 20 mN/m,oil droplets are more likely to agglomerate upon ***,increasing collision velocity leads to progressive destabilization of oil *** critical velocities for agglomeration-separation and separation-fragmentation are identified as 8 m/s and 16 m/s,respectively.A Weber number(We)–collision angle map was constructed to represent the collision behaviors of oil droplets,revealing that at We<14.4,oil droplets agglomerate effectively after collision at any *** value is twice that of water droplets,indicating that oil droplets are more prone to agglomeration upon *** findings provide valuable insights for optimizing parameters in electrical agglomeration processes.

关键词： oil droplet electricity agglomeration collision behaviors purification

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The regulatory effect of the asymmetrical dress style on people’s thermal comfort and heat loss

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Building Simulation 2024年第12期17卷 2311-2329页

作者： Cong Song Dongxue Zhao Yanfeng Liu Jia Li Jinyu Zhao School of Building Services Science and Engineering Xi’an University of Architecture and TechnologyXi’anShaanxi 710055China State Key Laboratory of Green Building Xi’an University of Architecture and TechnologyXi’anShaanxi 710055China

On the plateau,symmetrical(WDS)and asymmetrical(WLS)dressing habits have been developed to adapt to the extreme climate of the plateau,which is characterized by large temperature *** studies have investigated the impact of these dressing styles on the heat loss and thermal comfort of the Xizang *** better characterize these impacts,models representing local heat loss of human are developed,and human heat loss experiments are conducted on the *** results showed that the WLS increased the total heat loss of the participants by a range between 7.2%and 25.7%compared to the WDS;however,WLS narrowed the range of localized heat loss and reset the distribution of heat loss *** the WLS,the localized convection and radiation heat loss reported in the right sleeve was higher than that of the WDS by a range of 3.1 to 12.5 W/m^(2)and 5.2 to 22.5 W/m^(2),***,the results of thermal neutral temperature of the participants increased by 2℃ when the WLS was *** on the distribution of heat loss to achieve localized insulation through clothing thermal regulation is an effective strategy to achieve human thermal comfort and energy savings.

关键词： local heat loss total heat loss Xizang people thermal comfort asymmetrical dressing

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