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Development of index system for inherently safer process design using an integrated approach

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Chinese Journal of Chemical Engineering 2019年第11期27卷 2725-2733页

作者： Junjie Feng Bin zhang Wei Xu Bing Sun fan zhang Jie Jiang State Key Laboratory of Safety and Control for Chemicals SINOPEC Research Institute of Safety EngineeringQingdao 266071China Jiangsu Key Laboratory of Hazardous Chemicals Safety and Control College of Safety Science and EngineeringNanjing Tech UniversityNanjing 211816China

With a growing population, an increasing number of petrochemical facilities are built with larger capacity and more complexity, which pose a great risk to assets, community and environment. The value of inherently safer design is recognized with time by all stakeholders, and an effective tool is needed to evaluate and compare inherent safety of alternative technologies. This study developed a safety index to evaluate existing technologies for their safety levels and guide inherently safer design. The Integrated Risk-based Safety Index(IRSI) was developed based on a comprehensive review of petrochemical processes, incident cases from Sinopec and US Chemical Safety Board, and existing safety index systems. The IRSI included all major hazards, including fire, explosion,toxic release, dust explosion, physical explosion, and runaway. Also, the integrated life cycle approach considered chemical hazards, equipment failure rates and safety measures in this risk-based index. Advanced modeling techniques, PHAST simulation and Neural Network, were used in the development of three novel sub-indices in the projects, fire, explosion and toxic release. The index system could be easily incorporated into a user friendly tool for the ease of application. A case study of hydrogen dioxide was conducted using the IRSI, which showed its capability for evaluating the safety level of process facilities.

关键词： Inherently safety Chemical process safety Integrated risk-based safety index PHAST Hydrogen dioxide

Non-thermal emission from Vela X and PWN G0.9+0.1

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Chinese Journal of Astronomy and Astrophysics 2009年第4期9卷 449-456页

作者： Wei-fan Qiao Li zhang Jun fang Department of Physics Yunnan University Kunming 650091 China

We study the multi-waveband non-thermal emission from the pulsar wind nebulae （PWNe） Vela X and G0.9＋0.1 in the frame of a time-dependent model describing non-thermal radiation from the PWNe. In such a model, the relativistic wind of particles driven by a central pulsar blows into the ambient medium and creates a termination shock that accelerates the particles to very high energy in a PWN. The non-thermal photons in the PWN are produced both by synchrotron radiation and the inverse Compton process, with electrons coming directly from the pulsar magnetosphere and electrons being accelerated at the termination shock. We apply this model to reproduce the observed multi-waveband photon spectra of Vela X and the G0.9＋0.1, both of which have been detected emitting very high energy photons. Our results indicate that TeV photons are produced by the inverse Compton scattering of the high-energy electrons in the infrared photon field in both Vela X and PWN G0.9＋0.1. The TeV photons from these two PWNe may have leptonic origins.

关键词： ISM individual objects Vela X, G0.9 + 0.1-gamma-rays theory

Historical trends in the anthropogenic heavy metal levels in the tidal flat sediments of Lianyungang, China

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Journal of Environmental Sciences 2013年第7期25卷 1458-1468页

作者： Rui zhang fan zhang Yingjun Ding Jinrong Gao Jing Chen Li Zhou School of Geodesy and Geomatics Engineering Huaihai Institute of Technology State Key Laboratory of Pollution Control and Resources Reuse Nanjing University Jiangsu Marine Resources Development Research Institute Huaihai Institute of Technology

The sedimentation of metals can preserve the historical record of contaminant input from local and regional sources and provide information on the historical changes in regionalwater and sediment quality. We report the 210Pb activities and the heavy metal （Cd, Cr, Cu, Mn, Pb and Zn）depth profiles from sediment cores retrieved in 2010. The mean sedimentation rates of 0.85-1.5 cm/yr aredetermined by 210 Pbdating. The sediments in the tidal flat have recorded heavy metaldeposition and thus allow the establishment of a connection between the temporal evolution of the heavy metal pollution and the historical changes in the economicdevelopment of Lianyungang. The enrichment factors （EF） are calculated to estimate the level of contamination stored in these sediments. The results show that in the studied sites, Cr and Cudisplay low EF values and are mainly from lithogenic origin. For the other studied trace metals, a great variability in the sedimentary record is observed. Significant anthropogenic enrichment over the last 50 years is revealed at the tidal flat that receives fluvial inputs. Zinc is the elementwith the highest EF values, followed by the order of Pb 〉 Cd 〉 Mn 〉 Cu and Cr. The temporal variations of the heavy metals peakduring the late 1980s to the early2000s and show adecreasing trend afterward. The pollution intensity of the tidal flat isdetermined by using EF and thegeo-accumulation index （Igeo ）,which show that, based on the Igeo scale, the tidal flat of Haizhou Bay is unpolluted to moderately polluted.

关键词： sediment rates heavy metals pollution anthropogenic input tidal flat

Alternative Splicing and Differential Expression of Two Transcripts of Nicotine Adenine Dinucleotide Phosphate Oxidase B Gene from Zea mays

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Journal of Integrative Plant Biology 2009年第3期51卷 287-298页

作者： fan Lin Yun zhang Ming-Yi Jiang College of Life Sciences Nanjing Agricultural University Nanjing 210095 China

With the exception of rice, little is known about the existence of respiratory burst oxidase homolog （rboh） gene in cereals. The present study reports the cloning and analysis of a novel rboh gene, termed ZmrbohB, from maize （Zea mays L.）. The full-length cDNA of ZmrbohB encodes a 942 amino acid protein containing all of the respiratory burst oxidase homolog catalytically critical motifs. Alternative splicing of ZmrbohB has generated two transcript isoforms, ZmrbohB-α and -β. Spliced transcript ZmrbohB-β retains an unspliced intron 11 that carries a premature termination codon and probably leads to nonsense-mediated mRNA decay. Expression analysis showed that two splice isoforms were differentially expressed in various tissues and at different developmental stages, and the major product was ZmrbohB-e. The transcripts of ZmrbohB-α accumulated markedly when the maize seedlings were subjected to various abiotic stimuli, such as wounding, cold （4℃）, heat （40℃）, UV and salinity stress. In addition, several abiotic stimuli also affected the alternative splicing pattern of ZmrbohB except wounding. These results provide new insight into roles in the expression regulation of plant rboh genes and suggest that ZrnrbohB gene may play a role in response to environmental stresses.

关键词： abiotic stress alternative splicing respiratory burst oxidase homolog Zea mays.

Evaluation of the correlation between ammonia nitrogen and p-toluidine using sequencing batch reactor treating synthetic p-toluidine wastewater

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Journal of Environmental Sciences 2006年第2期18卷 259-262页

作者： zhang Bo CHEN Jin-long WANG fan zhang Wei-ming zhang Quan-xing Department of Environmental Engineering Nanjing University Nanjing 210093 China

This paper presents lab-scale experiment carried out to evaluate the correlation between ammonia nitrogen （NH3-N） and p-toluidine using sequencing batch reactor treating synthetic p-toluidine wastewater. The profiles of NH3-N and p-toluidine were traced under the concentration of sucrose in the influent varied from 0 to 500 mg/L, aerated airflow varied from 0.6 to 1.2 L/min and temperature varied from 10 to 25℃, respectively. The results showed that the concentration of NH3-N turned from increase to decrease when p-toluidine was nearly completely biodegraded, so the profile of NH3-N could clearly indicate the endpoint of p-toluidine biodegradation. And the profile of NH3-N was not influenced by the sucrose in the influent, aerated airflow and temperature. It is showed that using ammonia nitrogen as monitoring and control parameter is feasible and reliable and has promising application in amine wastewater treatment by SBR.

关键词： sequencing batch reactor correlation ammonia nitrogen p-toluidine biodegradation

Two-dimensional organic cathode materials for alkali-metal-ion batteries

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Journal of Energy Chemistry 2018年第1期27卷 86-98页

作者： Chao zhang Chenbao Lu fan zhang Feng Qiu Xiaodong Zhuang Xinliang Feng Shanghai Key Lab of Electrical Insulation and Thermal Ageing Shanghai Electrochemical Energy Devices Research CenterSchool of Chemistry and Chemical EngineeringShanghai Jiao Tong University School of Chemical and Environmental Engineering Shanghai Institute of Technology Department of Chemistry and Food Chemistry Center for Advancing Electronics Dresden(cfaed)Technische Universit?t Dresden

With the increasing demand for large-scale battery systems in electric vehicles（EVs） and smart renewable energy grids, organic materials including small molecules and polymers utilized as electrodes in rechargeable batteries have received increasing attraction. In recent years, two-dimensional（2D） organic materials possessing planar layered architecture exhibit optional chemical modification, high specific surface area as well as unique electrical/magnetic properties, which have been emerging as the promising functional materials for wide applications in optoelectronics, catalysis, sensing, etc. Integrating with high-density redox-active sites and hierarchical porous structure, significant achievements in 2D organic materials as cathode materials for alkali-metal-ion batteries have been witnessed. In this review, the recent progress in synthetic approaches, structure analyses, electrochemical characterizations of 2D organic materials as well as their application in alkali-metal-ion batteries containing lithium ion battery（LIB）, lithium sulfur battery（LSB）, lithium air battery（LAB） and sodium ion battery（SIB） are summarized systematically,and their current challenges including cycling stability and electron conductivity for cathode materials in battery fields are also discussed.

关键词： Organic material Two-dimensional Cathode Alkali-metal-ion battery

The Market Reaction to Cross-border Listings:Evidence from AH Listed Firms

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China & World Economy 2022年第6期30卷 183-218页

作者： John fan zhang School of Business Macao University of Science and TechnologyChina

This study examines the abnormal returns of Chinese firms dual-listed on the Chinese mainland(A-share)and Hong Kong SAR(H-share)stock *** results show that abnormal returns are more significant for the existing H-share firms cross-listing back as(H-to-A cross-listings)than for those that are the other way around(A-to-H crosslistings).Further,the A-share market is more responsive to announcements,whereas the H-share market is more responsive to actual *** analysis of the underlying mechanisms reveals that the abnormal returns of A-to-H cross-listings are associated with improved *** contrast,the abnormal returns of H-to-A cross-listings are related to an increase in *** abnormal returns for H-to-A crosslistings are driven mainly by reduced systematic risks and are more pronounced in the post-1997 ***,these results suggest that investors generally respond positivelytoAHdual listingsof Chinesefirms.

关键词： Market fir mainland

β-Cyclodextrin functionalized graphene oxide： an efficient and recyclable adsorbent for the removal of dye pollutants

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Frontiers of Chemical Science and Engineering 2015年第1期9卷 77-83页

作者： Shanshan WANG Yang LI Xiaobin fan Fengbao zhang Guoliang zhang Department of Chemical Engineering and Technology Tianjin University Tianjin 300072 China

A novel method for the preparation of β- cyclodextrin grafted graphene oxide （GO-β-CD） has been developed. The GO-β-CD was characterized by Fourier transform infrared spectroscopy, 13C NMR spectroscopy, Raman spectroscopy and thermogravimetric analysis. The ability of GO-β-CD to remove fuchsin acid from solution was also studied. The GO-β-CD had an excellent adsorption capacity for fuchsin acid and could be recycled and reused. The adsorption capacities of GO-β-CD for other dye pollutants such as methyl orange and methylene blue were also investigated. The absorption capacities for the three dyes are in the order： fuchsin acid 〉 methylene blue 〉 methyl orange.

关键词： graphene oxide β-cyclodextrin adsorptioncapacity recycle

Numerical Study on the Gas Leakage and Dispersion at the Street Intersection of a Building Group

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Computer Modeling in Engineering & Sciences 2020年第6期123卷 1247-1266页

作者： Weitao zhang Mengqi Liu Kaiyi Wang fan zhang Lei Hou National Engineering Laboratory for Pipeline Safety Beijing Key Laboratory of Urban Oil and Gas Distribution TechnologyChina University of PetroleumBeijing102249China CangHaiBang Business Unit Supply Chain Business GroupSinochem Energy High-Tech Co.Ltd.Beijing100094China Sinopec Economics&Development Research Institute Beijing100029China College of Arts and Science Boston UniversityBostonMA 02215USA.

Accidents involving natural gas leakage and dispersion pose a significant threat to human life and *** threat is especially relevant at the street intersection at which dense buildings,heavy traffic flow,and complex underground pipe networks *** have conducted numerous studies on gas leakage and dispersion,but investigations of natural gas leakage and dispersion at the street intersection of a building group are not *** this paper,we presented a three-dimensional(3D)physical model based on the Computational Fluid Dynamic(CFD)methodology to study the natural gas leakage and dispersion at the street intersection of a building *** validated the CFD methodology applied in the research based on the data from the field tests and wind tunnel ***,we simulated and analyzed the pressure,wind,and concentration of natural gas dispersion at the street *** simulation results showed that vortex regions,low-pressure zones,and a building group effect could cause a build-up of natural gas concentration under perpendicular wind direction *** addition,the area of hazardous region tended to increase first and then drop with the dispersion *** the case of this study,the maximum area of hazardous region is 200 m2 located in the height of 55 m,which is the middle plane in the computational *** results in the paper can provide scientific references for the safe operation and emergency-management decisions of municipal gas.

关键词： Natural gas computational fluid dynamic building group street intersection leakage and dispersion numerical simulation concentration field