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FeWO4 nanorods with excellent UV–Visible light photocatalysis

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Progress in Natural Science:Materials International 2017年第5期27卷 556-560页

作者： Qunxiang Gao zhijian liu Department of Power Engineering North China Electric Power University

FeWO4nanorods were synthesized through a hydrothermal progress with the assistant of L-cysteine. The synthesized FeWO4nanorods were characterized by X-ray powder diffraction, Raman spectrometer, scanning electron microscopy, transmission electron microscopy, high-resolution transmission electron microscopy,energy-dispersive X-ray spectroscope and X-ray photoelectron spectroscopy. The optical property, photocatalytic activity and magnetic property of the synthesized FeWO4nanorods were investigated. The photodecomposition of Methyl orange for FeWO4nanorods depends on the wavelength of the irradiating light. Under ultraviolet-visible light irradiation, FeWO4nanorods show higher photocatalytic activity for the decomposition of Methyl orange than that of ultraviolet light irradiation. A possible mechanism of FeWO4on the decomposition of Methyl orange was proposed. The value of Néel temperature is lower than that of bulk FeWO4, which is associated with the size effects and the shape of the synthesized FeWO4nanorods.

关键词： FeWO4 Nanorods Photocatalysis

Quantitative distribution of human exhaled particles in a ventilation room

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Building Simulation 2022年第5期15卷 859-870页

作者： zhijian liu Hangyao Zhu Yangfan Song Guoqing Cao Department of Power Engineering North China Electric Power UniversityBaoding 071003China Institute of Building Environment and Energy China Academy of Building ResearchBeijing 100013China

Respiratory viruses can be attached to human exhaled particles and spread from person to person through respiratory *** purpose of this study is to obtain the quantitative description formula of human exhaled particles in the ventilated room through amount number of numerical simulation calculations and regression statistical analysis of the simulated *** this study,a combination of numerical simulation and laboratory experiments was used,and the results were tallied *** subtilis was released as a release source to investigate the migration and distribution of *** results show that under the condition of high air supply velocity,due to the disturbance of human respiration and airflow,the diffusion velocity of exhaled particles was faster and the diffusion range is larger than that of low air supply velocity within the same time *** matter where the location of the manikin was in the room,the exhaled particles would spread to the whole room in at least 900 *** method used in this study could be used to predict the distribution of human exhaled particles concentration in different indoor spaces,such as public transport and *** findings could provide valuable reference for the location of indoor air purifiers,which plays a guiding role in the construction of a healthy indoor environment.

关键词： droplet aerosols particulate concentrations bioaerosol release experiment CFD predictions

Role of Tip60 tumor suppressor in DNA repair pathway

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Chinese Science Bulletin 2011年第12期56卷 1212-1215页

作者： liu zhijian SUN YingLi Beijing Institute of Genomics Chinese Academy of Sciences Beijing 100029 China

To prevent the damage caused by DNA strand breaks, eukaryotic cells have evolved a series of highly conserved DNA repair mechanisms. The ubiquitously expressed acetyltransferase, Tip60, plays a central role in ATM (ataxia-telangiectasia mutated) activation which is involved in DNA repair. Recent work uncovered a new mechanism of ATM activation mediated by Tip60 and demonstrated that histone methylation, specifically, trimethylation of histone H3, is a key factor in the process. Here, we review the current understanding of how Tip60 is activated and how it activates ATM in response to DNA damage.

关键词： DNA修复抑癌作用组蛋白H3 DNA链断裂毛细血管扩张修复机制 DNA损伤 ATM

MICROSTRUCTURE AND MECHANICAL PROPERTY OF LAVES PHASE TiCr_2-BASED ALLOYS

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中国有色金属学会会刊：英文版 1997年第2期7卷 124-128页

作者： He, Yuding Qu, Xuanhui Huang, Baiyun liu, zhijian Central South Univ of Technology Changsha China

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关键词： Laves phase TiCr 2 microstructure phase structure microhardness

Prevention of surgical site infection under different ventilation systems in operating room environment

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Frontiers of Environmental Science & Engineering 2021年第3期15卷 63-76页

作者： zhijian liu Haiyang liu Hang Yin Rui Rong Guoqing Cao Qihong Deng Department of Power Engineering North China Electric Power UniversityBaoding 071003China Department of Civil Engineering Technical University of DenmarkCopenhagenDK-2800 KgsDenmark Institute of Building Environment and Energy China Academy of Building ResearchBeijing 100013China School of Energy Science and Engineering Central South UniversityChangsha 410083China

Biological particles in the operating room(OR)air environment can cause surgical site infections(SSIs).Various ventilation systems have been employed in ORs to ensure an ultraclean ***,the effect of different ventilation systems on the control of bacteria-carrying particles(BCPs)released from the surgical staff during surgery is *** this study,the performance of four different ventilation systems(vertical laminar airflow ventilation(VLAF),horizontal laminar airflow ventilation(HLAP),differential vertical airflow ventilation(DVAF),and temperature-controlled airflow ventilation(TAF))used in an OR was evaluated and compared based on the spatial BCP *** airflow field in the OR was solved by the Renormalization Group(RNG)k-e turbulence model,and the BCP phase was calculated by Lagrangian particle tracking(LPT)and the discrete random walk(DRW)*** was found that the TAF system was the most effective ventilation system among the four ventilation systems for ensuring air cleanliness in the operating *** study also indicated that air cleanliness in the operating area depended not only on the airflow rate of the ventilation system but also on the airflow distribution,which was greatly affected by obstacles such as surgical lamps and surgical staff.

关键词： Operating room(OR) Bacteria-carrying particles(BCPs) Surgical site infections(SSIs) Ventilation

Dust accumulated fungi in air-conditioning system:Findings based on field and laboratory experiments

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Building Simulation 2021年第3期14卷 793-811页

作者： zhijian liu Yuzhu Deng Shengyuan Ma Bao-Jie He Guoqing Cao Department of Power Engineering North China Electric Power UniversityBaodingHebei 071003China Faculty of Built Environment University of New South WalesNSW Sydney2052Australia Institute of Building Environment and Energy China Academy of Building ResearchBeijing 100013China

This study analyzes the growth and reproduction of dust accumulated fungi(DAF)in an air-conditioning system based on field measurement and molecular biology,laboratory experiment and prediction *** field measurement was conducted to collect dust in filter screen,surface cooler and air supply duct of two air handling units(AHUs).The results indicate that dust volume and fungal number in two AHUs generally met the hygienic specification of public buildings,but the cleansing did not fulfil ***-throughput sequencing was conducted,revealing that the dominant fungal species were Alternaria_betae-kenyensis,Cladosporium_delicatulum,Aspergillus_sydowii,Verticillium_*** experiment was conducted to analyze the impact of several factors(*** time,temperature,relative humidity,duct material)and their combination on the DAF *** results indicate that fungal growth increased with time,peaking at 4 days or 5 *** relative humidity or temperature was conducive to fungal *** orthogonal experiment revealed that the condition of“antibacterial composite,22±1℃and 45%-55%RH”had the strongest inhibiting impact on fungal *** model,Gompertz model and square-root model were further developed to predict the fungal growth under different *** results show that the Logistic model had high feasibility and accuracy,the Gompertz model was feasible with lower accuracy and the square-root model was feasible with high ***,this study facilitates the understanding of the DAF growth in air-conditioning ducts,which is important for real-time prediction and timely control of the fungal contamination.

关键词： dust accumulated fungi high-throughput sequencing air supply duct duct material orthogonal experiment fungal growth prediction

Optimizing Building Envelope Dimensions for Passive Solar Houses in the Qinghai-Tibetan Region: Window to Wall Ratio and Depth of Sunspace

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Journal of Thermal Science 2019年第6期28卷 1115-1128页

作者： liu zhijian WU Di LI Junyang YU Hancheng HE Baojie Department of Power Engineering North China Electric Power UniversityBaodingHebei 071003China Department of Building Energy Conservation Qinghai College of Architectural TechnologyXining 810002China Faculty of Built Environment University of New South WalesNSW 2052Australia

It has been a focus to reduce the energy consumption and improve the space heating performance of high-altitude buildings in winter seasons. In view of the abundant solar energy resources of the high-altitude region, the establishment of passive solar houses should be an effective strategy to deal with the problem of thermal comfort. Both window to wall ratio(WWR) and sunspace depth are of vital importance to determine the thermal comfort level of passive solar houses, while there are limited studies on analyzing their impacts on passive solar houses in high-altitude regions. Therefore, this study is designed to examine how WWR and sunspace depth affect space heating of passive solar houses in the Qinghai-Tibetan region. To be specific, the hourly radiation temperature variations and percentages of dissatisfaction of the residential building with different sunspace depth/WWR(including 0.9 m/33%, 0.9 m/45%, 0.9 m/60%, 1.2 m/33% and 1.5 m/33%) were quantitatively examined. Results indicated that under the condition of 0.9 m/45%, the overall average radiation temperature of the building was approximately 16°C during the entire heating season, which could better satisfy the heating requirements. Meanwhile, the average temperature was higher, and the thermal comfort level was better under the ratio of 45% or the depth of 1.5 m, when only an individual factor in either ratio or depth was considered. These findings can provide references for the determination of dimensions of passive solar houses in high-altitude regions.

关键词： passive solar house indoor thermal comfort sunspace depth WWR (window to wall ratio) PPD (Predicted Percent Dissatisfied)

Performance Evaluation and Optimization of a Novel System Combining a Photovoltaic/Thermal Subsystem&an Organic Rankine Cycle Driven by Solar Parabolic Trough Collector

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Journal of Thermal Science 2021年第5期30卷 1513-1525页

作者： liu zhijian WEI Tianhe WU Di ZHANG Yulong LI Guiqiang YANG Xinyan Department of Power Engineering North China Electric Power UniversityBaoding 071003China Research Centre for Sustainable Energy Technologies University of HullHull HU67RXUK Institute of Building Environment and Energy China Academy of Building ResearchBeijing 100013China

A novel coupling system that combines a photovoltaic/thermal(PV/T)subsystem and an Organic Rankine Cycle(ORC)driven by solar parabolic trough collector(PTC)is presented in this *** mathematical model is initially *** the basis,the influence of area ratio of two collectors(PV/T and PTC)on the performance of system is *** results show that the optimal area ratio of PV/T to PTC is 8:2,which can achieve the maximum energy ***,the performance of the coupling system and two independent systems(PV/T and ORC system)are compared and *** results show that the coupling system is more reliable and its total output energy(heat and electricity)is the highest,compared with the other two independent *** solar energy utilization efficiency of the coupling system is 40%higher than that of the other two independent systems in the steady-state ***,the annual output energy per unit area collector of the coupling system is 13%higher than that of the other two independent systems in the dynamic ***,in the dynamic simulation of a typical day,the PV panels’temperature of the coupling system is 5℃–7℃ lower than that of the independent PV/T *** means that the power generation efficiency of PV panels can be increased by 1.5%–3.5%.This study aims to explore the operation characteristics of the novel solar energy utilization coupling system and promote the development of renewable energy utilization models,which provides a reference for the design and optimization of related energy systems.

关键词： solar energy utilization efficiency photovoltaic/thermal Organic Rankine Cycle novel coupling system area ratio

The influence of air supply inlet location on the spatial-temporal distribution of bioaerosol in isolation ward under three mixed ventilation modes

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Energy and Built Environment 2023年第4期4卷 445-457页

作者： zhijian liu Tianci Wang Yongxin Wang Haiyang liu Guoqing Cao Song Tang Department of Power Engineering North China Electric Power UniversityBaodingHebei 071003China Institute of Building Environment and Energy China Academy of Building ResearchBeijing 100013China China CDC Key Laboratory of Environment and Population Health National Institute of Environmental HealthChinese Center for Disease Control and PreventionBeijing 100021China

The outbreak of COVID-19 and the spread of infectious pathogens through bioaerosols have once again aroused widespread concern *** ward is an important place to prevent the spread of infectious ***,infection of health care workers(HCWs)in the isolation ward often occurs,so it is ur-gent to carry out relevant research to reduce the cross-infection between HCWs and *** this paper,the temporal and spatial distribution characteristics of bioaerosols under three mixed ventilation modes in a single ward were studied,namely,upper supply side return air of Case 1 and side supply and side return ventilation are Case 2 and Case 3 *** results show that the removal efficiency of bioaerosol in the ventilation mode of Case 3,in which directional airflow is formed from the air supply inlet to the release source and then to the exhaust outlet,is 46.6%and 67.7%higher than that of Case 1 and Case 2,*** addition,ventilation methods based on mixed theory do not guarantee good air quality in the breathing zone(1.3 m to 1.7 m)of HCWs,which may increase the inhalation risk for *** is hoped that our results can provide some useful suggestions for optimizing the airflow layout of the isolation ward,reducing the risk of cross-infection,and virus elimination.

关键词： Bioaerosol Isolation ward Mixed ventilation Breathing zone Computational fluid dynamics