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Study on Evacuation Strategy of Commercial High-Rise Building under Fire Based on FDS and Pathfinder

Computer Modeling in Engineering & Sciences 2024年第2期138卷 1077-1102页

作者： zheng Yan Ying Wang Longxiao Chao Jian guo Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education SoutheastUniversityNanjing210096China Nanjing Yang Zi State-Owned Investment Group Nanjing210096China

With the development of economy and society and the growth of population,the high-rise and multi-function of commercial buildings have become an international *** it also poses huge fire *** of the existing studies’research objects are predominantly high-rise residential buildings,without considering the impact of different functional zones(Standard floor,entertainment zone,office zone,equipment room and so on)and personnel distribution of commercial buildings *** the influence of using elevators to carry evacuees on the refuge floor on personnel evacuation is rarely *** this work,the fire scenario of the Yangtze River InternationalConferenceCenter,a high-rise commercial building,is simulated with the Pyrosim programto get the necessary parameters under various fire scenarios and to calculate the available evacuation time *** the same time,according to the complex functional zone of the commercial high-rise building and the distribution of people in different time periods,a reasonable evacuation strategy is developed and simulated by Pathfinder *** results indicate that unorganized evacuation will lead individuals to take the erroneous evacuation route,resulting in a vast region of congestion;comprehensive consideration of the time staggering and the reasonable distribution of evacuation routes can significantly improve evacuation efficiency,and the TRSET of night and working hours is 36.6%–55.3%and 49.9%–79.6%of unorganized evacuation,*** the night fire,60%of the people use elevator-refuge floor to evacuate is the optimal strategy;for the fire during working hours,half of the people on standard floors use the elevator to evacuate and people on multifunctional floors evacuate in four batches is the best *** results of this study can provide viable solutions and a foundation for analyzing the fire evacuation and safety of big commercial high-rise buildings.

关键词： High-rise building fire personnel evacuation refuge floor safety analysis

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Macroscopic polarization enhancement boosting piezo-photocatalytic performance via Nb-doping on B-site of Bi_(4)Ti_(3)O_(12)nanosheets

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Journal of Advanced Ceramics 2024年第4期13卷 437-446页

作者： hongjian Yu Xindong Wei Min Wang Yan Zhang zheng Wu Fan guo Jie Han School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002China Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid WastesNational Laboratory of Mineral MaterialsSchool of Material Sciences and TechnologyChina University of Geosciences(Beijing)Beijing 100083China School of Environmental and Chemical Engineering Xi’an Key Laboratory of Textile Chemical Engineering AuxiliariesXi'an Polytechnic UniversityXi'an 710048China

The development of a high-performance ferroelectric piezo-photocatalyst is an efficient strategy for advancing sustainability within the environmental and energy ***,a major challenge lies in the creation of a strong polarized electric field that can effectively hinder charge recombination,both within the bulk and on the surface of ***,we synthesize a series of Nb-doped Bi_(4)Ti_(3)O_(12)nanosheets via a facile one-pot hydrothermal method to achieve synergistically enhanced piezo-photocatalytic performance in CO_(2)reduction and pollutant *** optimized doped Bi_(4)Ti_(3)O_(12)demonstrates remarkable efficiency in the conversion of CO_(2)into CO,with a high production rate of 72.7μmol∙g−1∙h−1 without using co-catalysts or any sacrificial agent,surpassing the performance of unmodified Bi_(4)Ti_(3)O_(12)by up to 4.69 ***,our catalyst demonstrates ultra-fast piezo-photocatalytic degradation of organic pollutant Rhodamine B(RhB)at low concentrations and exceptional piezo-photocatalytic activity at high concentrations,outperforming most previously reported state-of-the-art *** systematic corroboration of catalyst characterization and experimental analysis reveals that the synergistic effect arises from the amplified macroscopic polarization induced by lattice distortion caused by the larger Nb ions,thereby improving piezo-photocatalytic *** research thus offers valuable insights into the direct design and fabrication of versatile catalytic systems,with applications spanning CO_(2)valorization and beyond.

关键词： CO_(2)reduction dye degradation piezo-photocatalysis Nb-doped Bi_(4)Ti_(3)O_(12) macroscopic polarization regulation

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Effect of microalloying on wettability and interface characteristics of Zr-based bulk metallic glasses with W substrate

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China Foundry 2024年第4期21卷 352-359页

作者： Zhen Zhang Lin-na Feng Jin-he Wang zheng-kun Li Hua-meng Fu hong Li zheng-wang Zhu Hai-feng Zhang School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China School of Metallurgy Northeastern UniversityShenyang 110004China

The infiltration casting method is widely employed for the preparation of ex-situ composite ***,the production of composite materials using this method must necessitates a comprehensive understanding of the wettability and interface characteristics between the reinforcing phase and the bulk metallic glasses(BMGs).This work optimized the composition of Zr-based BMGs through microalloying methods,resulting in a new set of Zr-based BMGs with excellent glass-forming *** experiments between the Zr-based BMGs melts and W substrates were conducted using the traditional sessile drop method,and the interfaces were characterized utilizing a scanning electron microscope(SEM)equipped with energy dispersive X-ray spectroscopy(EDS).The work demonstrates that the microalloying method substantially enhances the wettability of the Zr-based BMGs ***,the incorporation of Nb element impedes the formation of W-Zr phases,but the introduction of Nb element does not alter the extent of interdiffusion between the constituent elements of the amorphous matrix and W element,indicating that the influence of Nb element on the diffusion of individual elements is minute.

关键词： Zr-based BMGs infiltration casting method wettability interface characteristics W-Zr phases

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Science China(Life Sciences) 2024年第9期67卷 1970-1988页

作者： Jiayi Yu Changbing zheng Qiuping guo Yulong Yin Yehui Duan Fengna Li CAS Key Laboratory of Agro-ecological Processes in Subtropical Region Hunan Provincial Key Laboratory of Animal Nutritional Physiology and Metabolic ProcessNational Engineering Laboratory for Pollution Control and Waste Utilization in Livestock and Poultry ProductionInstitute of Subtropical AgricultureChinese Academy of SciencesChangsha 410125China University of Chinese Academy of Sciences Beijing 100049China College of Animal Science and Technology Hunan Agricultural UniversityChangsha 410128China

We previously demonstrated that lipopolysaccharide(LPS)injection-induced immune stress could impair muscle growth in weaned piglets,but the precise mechanisms behind this remain ***,we found that chronic immune stress induced by LPS resulted in a significant reduction of 36.86%in the total muscle mass of piglets at 5 d post-treatment compared with the control *** 1 d,prior to muscle mass loss,multiple alterations were noted in response to LPS *** included a reduction in the abundance of Bacteroidetes,an increase in serum concentrations of pro-inflammatory cytokines,compromised mitochondrial morphology,and an upregulation in the expression of dynamin-related protein 1(Drp1),a critical protein involved in mitochondrial *** highlight a strong negative correlation between Bacteroidetes abundance and the levels of serum pro-inflammatory cytokines,corroborated by in vivo intervention strategies in the musculature of both pig and mouse ***,the effects of Bacteroidetes on inflammation and muscle mass loss may involve the signaling pathway of the tauro-β-muricholic acid-fibroblast growth factor ***,the induction of overexpression of inflammatory cytokines,achieved without LPS treatment through oral administration of recombinant human IL-6(rh IL-6),led to increased levels of circulating cytokines,subsequently causing a decrease in muscle ***,pre-treatment with Mdivi-1,an inhibitor of Drp-1,markedly attenuated the LPS-induced elevation in reactive oxygen species levels and rescued the associated decline in muscle ***,these data indicate that LPS-induced muscle mass loss was linked to the reduction of Bacteroidetes abundance,increased inflammation,and the disruption of mitochondrial *** insights offer promising avenues for the identification of potential therapeutic targets aimed at mitigating muscle mass loss.

关键词： Bacteroidetes inflammation mitochondrial morphology muscle mass loss piglets

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Enhancer of Shoot Regeneration 2(ESR2)regulates pollen maturation and vitality in watermelon(Citrullus lanatus)

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Journal of Integrative Agriculture 2024年第10期23卷 3506-3521页

作者： Hu Wang Lihong Cao Yalu guo zheng Li Huanhuan Niu College of Horticulture Henan Agricultural UniversityZhengzhou 450002China State Key Laboratory of Crop Stress Biology in Arid Areas College of HorticultureNorthwest A&F UniversityYangling 712100China

Watermelon(Citrullus lanatus)holds global significance as a fruit with high economic and nutritional *** the regulatory network of watermelon male reproductive development is crucial for developing male sterile materials and facilitating *** its importance,there is a lack of research on the regulation mechanism of male reproductive development in *** this study,we identified that ClESR2,a VIIIb subclass member in the APETALA2/Ethylene Responsive Factor(AP2/ERF)superfamily,was a key factor in pollen *** insitu hybridization confirmed significantClESR2 expression in the tapetum and pollen during the later stage of anther *** pollens of transgenic plants showed major defects in morphology and vitality at the late development *** RNA-seq and protein interaction assay confirmed that ClESR2 regulates pollen morphology and fertility by interacting with key genes involved in pollen development at both transcriptional and protein *** suggest that Enhancer of Shoot Regeneration 2(ESR2)plays an important role in pollen maturation and *** study helps understand the male reproductive development of watermelon,providing a theoretical foundation for developing male sterile materials.

关键词： ESR2 watermelon overexpression pollen maturation pollen vitality

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Review on research and development of oxy-coal burner for carbon capture

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Science China(Technological Sciences) 2024年第3期67卷 647-672页

作者： guo JunJun LIU JingZhang ZHANG Tai HU Fan LI PengFei LIU ZhaoHui zheng ChuGuang State Key Laboratory of Coal Combustion School of Energy and Power EngineeringHuazhong University of Science and Technology Wuhan 430074China CCRC King Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Kingdom of Saudi Arabia Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China National Key Laboratory of High Efficiency and Low Carbon Utilization of Coal Beijing 100049China Institute of Energy Research Jiangxi Academy of SciencesNanchang 330096China Carbon Neutrality Research Center of Jiangxi Province Nanchang 330096China Faculty of Engineering China University of Geosciences(Wuhan)Wuhan 430074China National Energy Research and Development Center of Clean and Low Carbon Coal-based Power Generation Technologies Wuhan 430074China

In the past two decades, the oxy-fuel combustion of pulverized coal has been extensively developed, leading to the completion of several large industrial pilot oxy-fuel plants worldwide. Various types of oxy-fuel burners have been designed and tested in largescale pilot plants as key components of oxy-fuel combustion. These burners face major challenges in terms of their flame stability because of their decreasing stream momentum ratio and increasing carbon dioxide concentration. However, it offers flexibility in adjusting the oxygen concentration in each burner stream. This study aims to provide a comprehensive review of the state-of-the-art knowledge on oxy-coal burner design and operation in power plants. First, the combustion characteristics under oxy-fuel conditions are briefly introduced. Subsequently, the principal requirements and fundamental parameters of the oxy-coal burners are discussed. The development process of oxy-fuel burners is also presented. Moreover, a compatible design strategy and scaling-up techniques are described for oxy-coal burners developed by the authors over the past ten years. The performances of oxy-coal burners in three large pilot oxy-fuel plants worldwide are summarized and compared. Finally, concluding remarks are provided and potential research needs are suggested.

关键词： carbon capture oxy-fuel combustion oxy-fuel burner pulverized coal compatible design

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Degradation Behavior of Zn-Cu Stents with Different Coatings in Sodium Chloride Solution

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Acta Metallurgica Sinica(English Letters) 2024年第9期37卷 1564-1580页

作者： Xingpeng Liao Jialuo Huang Zhilin Liu Jingru guo Dajiang zheng Pengbo Chen Fuyong Cao Center for Marine Materials Corrosion and Protection Fujian Key Laboratory of Surface and Interface Engineering for High Performance MaterialsCollege of MaterialsXiamen UniversityXiamen361005China Light Alloys Research Institute College of Mechanical and Electrical EngineeringCentral South UniversityChangsha410083China First Affiliated Hospital of Xi’an Jiao Tong University Xi’an710061China

The Zn0.6Cu wires are fabricated into stents for the potential biodegradable application of nasal wound *** degradation behavior of Zn0.6Cu stents in 0.9 wt%NaCl at 36.5℃ is *** shows that the untreated Zn0.6Cu stent experiences severe crevice corrosion with acceleration and autocatalytic effects within the micro-cracks and ruptures at 4.67±1.15 d,with the average corrosion rate of 0.28 mm y^(-1).Fortunately,the anodic polarization(AP)+hydrothermal(H)conversion coating,consisting of ZnCO_(3),Zn(OH)_(2) and ZnO,could inhibit the crevice corrosion significantly by reducing the cathode/anode ratio,extending the rupture time up to 16.50±2.95 d,with the average corrosion rate of 0.14 mm y^(-1).This research indicates that the biodegradable Zn-based stent has some potential applications in nasal wound recovery area.

关键词： Zn alloys wires Corrosion behavior Biodegradable stents Coating Degradation characterization

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Strengthening and control of second-phase particle precipitation in ferritic/austenitic/martensitic heat-resistant alloys:a review

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Journal of Iron and Steel Research International 2024年第1期31卷 3-23页

作者： Xue-cheng Peng Han-jie guo Xin-fang Zhang Yi-wa Luo Ye Sun Jing guo Rong-guang Yang Xiao-dan zheng School of Metallurgical and Ecological Engineering University of Science and Technology Beijing(USTB)Beijing100083China Beijing Key Laboratory of Special Melting and Preparation of High-End Metal Materials University of Science and Technology Beijing(USTB)Beijing100083China Beijing Shougang Gitane New MATERIALS Co. Ltd.Beijing102206China

Heat-resistant alloys with excellent mechanical properties are widely used in various fields,and further improvement in their properties is essential to meet the requirements in new-generation advanced supercritical boilers,nuclear reactors,superheaters,and other new materials *** effectively enhance the comprehensive performance of heat-resistant alloys,second-phase particle strengthening has been widely studied,and in the face of different service envi-ronments of advanced heat-resistant steels,the selection of suitable second-phase particles is essential to maximize the performance of these *** this end,three major types of reinforcing phases in heat-resistant alloys such as carbides,rare earth oxides,and intermetallic compounds are summarized.A comparative analysis of the precipitation behavior of the reinforcing phases with different types as well as the risks and means of controlling their use in service,is *** parameters for the application of various types of second-phase particles in heat-resistant alloys are provided to support the design and preparation of new ultrahigh-performance heat-resistant alloys.

关键词： Heat-resistant alloy Second-phase particle Carbide Rare earth oxide Intermetallic compound Strengthening

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Both host and diet shape bacterial communities of predatory mites

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Insect Science 2024年第2期31卷 551-561页

作者： hong Yan Endong Wang guo-Shu Wei Bo Zhang Xuenong Xu Institute of Plant Protection Chinese Academy of Agricultural SciencesBejingChina College of Plant Protection Hebei Agricultural UniversityBaodingHebei ProvinceChina Key Laboratory of Natural Enemies Insects Ministry of Agriculture and Rural AffairsBeijingChina

Microbial communities,derived from food,ambient,and inner,can affect host ecological adaption and *** with most phytophagous arthropods,predators may have more opportunities to develop specific microbiota depending on the level of prey *** explore how diet sources affect host microbial communities and vary across predator species,we considered 3 types of predators from Phytoseiidae(Acari:Mesostigmata):polyphagous(Amblyseius orientalis Ehara,Neoseiulus barkeri Hughes,and Amblyseius swirski Athias-Henrio),oligophagous(Neoseiulus californicus McGregor),and monophagous(Phytoseiulus persimilis Athias-Henriot)predatory *** polyphagous species were fed on 2 types of diets,natural prey and alternative *** using 16S rRNA sequencing,we found that diet was the main source of microbiota in predatory mites,while there was no clear pattern affected by prey *** 3 polyphagous predators,host species had a larger impact than prey on microbial *** *** or *** which showed consistency in their microbiota,prey switching significantly affectedβ-diversity of bacterial composition in ***,with 56%of the microbial *** short,our results confirmed the substantial influence of diet on host microbial construction in predatory species,and highlighted species differences in shaping the microbiota which are not necessarily related to prey specialization.

关键词： diet switching feeding habits host-microbial interactions invertebrate microbiota 16S rRNA

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Platelet-derived microparticles and their cargos: The past, present and future

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Asian Journal of Pharmaceutical Sciences 2024年第2期19卷 72-88页

作者： Jingwen guo Bufeng Cui Jie zheng Chang Yu Xuran zheng Lixin Yi Simeng Zhang Keke Wang Department of Pharmacy The First Hospital of China Medical UniversityShenyang 110001 China School of Pharmacy China Medical UniversityShenyang 110122China Key Laboratory of Medical Cell Biology of Ministry of Education Key Laboratory of Major Chronic Diseases of Nervous System of Liaoning ProvinceHealth Sciences Institute of China Medical UniversityShenyang 110122China Department of Pharmacy The Fourth Affiliated Hospital of China Medical UniversityShenyang 110032China Department of Medical Oncology the First Hospital of China Medical UniversityShenyang 110001China

All eukaryotic cells can secrete extracellular vesicles, which have a double-membrane structure and are important players in the intercellular communication involved in a variety of important biological processes. Platelets form platelet-derived microparticles (PMPs) in response to activation, injury, or apoptosis. This review introduces the origin, pathway, and biological functions of PMPs and their importance in physiological and pathological processes. In addition, we review the potential applications of PMPs in cancer, vascular homeostasis, thrombosis, inflammation, neural regeneration, biomarkers, and drug carriers to achieve targeted drug delivery. In addition, we comprehensively report on the origin, biological functions, and applications of PMPs. The clinical transformation, high heterogeneity, future development direction, and limitations of the current research on PMPs are also discussed in depth. Evidence has revealed that PMPs play an important role in cell-cell communication, providing clues for the development of PMPs as carriers for relevant cell-targeted drugs. The development history and prospects of PMPs and their cargos are explored in this guidebook.

关键词： Platelet-derived particles Application Heter ogeneity Potential and limitations

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