553 results on '"Juncheng JIANG"'
Search Results
2. Analysis of chemical production accidents in China: data mining, network modeling, and predictive trends
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Yang Shi, Haitao Bian, Qingguo Wang, Yong Pan, and Juncheng Jiang
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chemical production accidents ,data mining ,network modeling ,accident analysis ,Crisis management. Emergency management. Inflation ,HD49-49.5 - Abstract
In recent years, China has experienced frequent chemical production accidents. This study collates 1900 briefings of such accidents from 2012 to 2023, sourced from a variety of repositories. By employing association rule mining, we analyzed the connections between causative factors and patterns of these accidents. The analysis revealed significant association rules characterized by high lift values, severe consequences, and patterns not previously recognized. A network model was constructed utilizing Gephi® software to represent the causative factors of these accidents. Through a centrality analysis of the network nodes, key factors contributing to these incidents were identified. Moreover, a SARIMAX model was developed and validated using time series data to predict future accident trends in chemical production. The forecasts generated by this model provide valuable insights for chemical production sectors, highlighting periods with an increased likelihood of accidents. Conclusively, this integration of data mining and predictive modeling could provide a critical method for improving safety protocols and enhancing risk management in chemical industry.
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- 2024
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3. Thermal hazard evaluation and risk assessment of 1-allyl-3-methylimidazole nitrate ionic liquid
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Jie Zhang, Demeng Qian, Han Zhang, Juncheng Jiang, Xu Zhang, Tao He, Jianye Wang, and Shang-Hao Liu
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Physics ,QC1-999 - Abstract
Imidazole ionic liquids (ILs) have broad application prospects in batteries and other fields. Researching the thermal decomposition features of ILs holds paramount importance for the application in battery electrolyte. 1-allyl-3-methylimidazole nitrate ionic liquid (IL) as a new functional IL, and its related thermal decomposition properties are unknown. In this paper, the thermal decomposition peculiarities of 1-allyl-3-methylimidazole nitrate IL were systematically analyzed by thermogravimetric analyzer, differential scanning calorimetry, and accelerating rate calorimeter techniques, and the relevant thermodynamic parameters and thermal decomposition models were derived. In addition, 1-allyl-3-methylimidazole nitrate IL possesses strong thermal runaway characteristics and the risk of thermal runaway is also evaluated. The main gaseous products formed by the pyrolysis of 1-allyl-3-methylimidazole nitrate IL was detected and analyzed by thermogravimetry-Fourier transform infrared spectroscopy and thermogravimetric-photoionization mass spectrometry techniques. The results showed that flammable gas, toxic gas, and asphyxiating gas are formed during the pyrolysis of 1-allyl-3-methylimidazole nitrate IL. This study lays a theoretical foundation for the safe application and the formulation of corresponding safety protection measures of 1-allyl-3-methylimidazole nitrate IL.
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- 2024
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4. Dynamic multi-attribute evaluation of digital economy development in China: a perspective from interaction effect
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Qinzi Xiao, Mingyun Gao, Lin Chen, and Juncheng Jiang
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digital economy evaluation ,grey relational degree ,fuzzy integral ,grey information coverage ,normal cloud matrix ,Economic growth, development, planning ,HD72-88 ,Business ,HF5001-6182 - Abstract
This study aims to reflect the grey information coverage and complex interactions effect in digital economy development. Therefore, a multi-attribute decision making method based on the grey interaction relational degree of the normal cloud matrix (GIRD-NCM) model is proposed. First, the original information coverage grey numbers are transformed into normal cloud matrixes, and then a novel Minkowski distance between normal clouds is proposed by using different information principles. Second, the GIRD-NCM model is established according to the Choquet fuzzy integral and grey relational degree. Finally, the dynamic comprehensive evaluation of digital economy development in China from 2013 to 2020 is conducted. The implementation, availability, and feasibility of the GIRD-NCM model are verified by comparative analysis with three existing evaluation models. The empirical findings reveal a stable growth trend in China’s digital economy, with an annual growth rate of 7.87%, however, there are notable regional development disparities. The change in interaction degree has no effect on the rankings of provinces that are in the lead or have a moderately high level of digital economy development, but has a positive and negative impact on the rankings of these provinces with high and low levels of digital economy development, respectively.
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- 2023
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5. Numerical Simulation and Consequence Analysis of Full-Scale Jet Fires for Pipelines Transporting Pure Hydrogen or Hydrogen Blended with Natural Gas
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Meng Li, Zhenhua Wang, Juncheng Jiang, Wanbing Lin, Lei Ni, Yong Pan, and Guanghu Wang
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hydrogen ,natural gas ,pipeline leak jet fire ,flame height ,CFD simulation ,thermal radiation ,Physics ,QC1-999 - Abstract
The use of existing natural gas pipelines for the transport of hydrogen/natural gas mixtures can achieve large-scale, long-distance and low-cost hydrogen transportation. A jet fire induced by the leakage of high-pressure pure hydrogen and hydrogen-blended natural gas pipelines may pose a severe threat to life and property. Based on the Abel–Nobel equation of state and a notional nozzle model, an equivalent pipe leakage model is established to simulate high-pressure pipeline gas leakage jet fire accidents. Large-scale high-pressure hydrogen and natural gas/hydrogen mixture jet fires are simulated, showing the jet impingement process and obtaining an accurate and effective simulation framework. This framework is validated by comparing the simulated and experimental measured results of flame height, flame appearance and thermal radiation. Several combustion models are compared, and the simulated data show that the non-premixed chemical equilibrium combustion model is superior to other combustion models. The influence of the pipe pressure and the hydrogen blending ratio on the consequences of natural gas/hydrogen mixture pipeline leakage jet fire accidents is explored. It is found that when the hydrogen blending ratio is lower than 22%, the increase in the hydrogen blending ratio has little effect on the decrease in the thermal radiation hazard distance.
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- 2024
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6. Adsorption of Co2+ and Cr3+ in Industrial Wastewater by Magnesium Silicate Nanomaterials
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Jing Bao, Yongjun Feng, Yong Pan, and Juncheng Jiang
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magnesium silicate nanomaterial ,hierarchical pore structure ,heavy metals Co2+ and Cr3+ ,adsorption ,industrial wastewater ,Technology ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Microscopy ,QH201-278.5 ,Descriptive and experimental mechanics ,QC120-168.85 - Abstract
In this paper, two flower-like magnesium silicate nanomaterials were prepared. These and another two commercial magnesium silicate materials were characterized using a scanning electron microscope, the N2 adsorption–desorption method, and other methods. The structure–activity relationship between the adsorption performance of these four magnesium silicate materials and their specific surface area, pore size distribution, and pore structure was compared. The results showed that the 3-FMS modified by sodium dodecyl sulfonate (SDS) had the largest specific surface area and pore size, the best adsorption performance, and the largest experimental equilibrium adsorption capacity (qe,exp) for Co2+, reaching 190.01 mg/g, and Cr3+, reaching 208.89 mg/g. The adsorption behavior of the four materials for Co2+ and Cr3+ both fitted the pseudo-second-order kinetic model and Langmuir adsorption model, indicating that chemical monolayer uniform adsorption was the dominant adsorption process. Among them, the theoretical adsorption capacity (qm) of 3-FMS was the highest, reaching 207.62 mg/g for Co2+ and 230.85 mg/g for Cr3+. Through further research, it was found that the four materials mainly removed Co2+ and Cr3+ through electrostatic adsorption, surface metal ions (Mg2+), and acidic groups (-OH and -SO3H) exchanging with ions in solution. The adsorption performance of two self-made flower-like magnesium silicate materials for Co2+ and Cr3+ was superior to that of two commercial magnesium silicates.
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- 2024
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7. Case study of fire and explosion accident based on damage consequence and numerical results: Explosion medium traceability
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Xiaojie Wang, Xingyu Shen, Xinming Qian, Qianran Hu, Mengqi Yuan, Mingzhi Li, and Juncheng Jiang
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Accident investigation ,Computational fluid dynamics ,Explosion modeling ,Alcohol-based fuel ,Liquefied petroleum gas ,Thermal analysis ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
Alcohol-based fuel is widely used in the catering industry due to the excellent economy, but its explosion risk has not been paid much attention in thermal engineering. In this paper, a serious fire accident caused by the leakage of civil alcohol-based fuel vapor in Northeast China is introduced in detail. A case study is carried out by means of on-site investigation and computational fluid dynamics (CFD) technology, and the accurate evaluation and reproduction of the multi-physical field loads are realized. There were two flammable and explosive gas leakage sources, liquefied petroleum gas and alcohol-based fuel, in the building during the accident. Which kind of gas was involved in the explosion process in the early stage of the accident and caused a major fire is an important part of the primary solution of the accident investigation team. In this paper, the damage consequences of the two gases after explosion were effectively restored by CFD. By comparing the on-site damage and numerical results, the explosion medium is identified as the alcohol-based fuel vapor and air explosive mixed gas in the gas cylinder room. The explosion process is that the sparks and high-temperature spatter generated during the welding process of the bracket ignite the methanol-air vapor near the inlet of the fuel tank, and the flame enters the upper gas-phase space of the tank from the inlet pipe and cause the explosion, resulting in a large amount of fuel splashing in the tank and causing fire. The key investigation techniques and research ideas provide an important reference for accident investigation and disaster analysis, and have scientific significance for revealing the accident cause and preventing similar accidents.
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- 2023
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8. Progress and prospects in crowd safety evacuation research in China
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Xiaowen Shao, Ran Ye, Jinghong Wang, Jiaojiao Feng, Yan Wang, and Juncheng Jiang
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safety evacuation ,web of science ,bibliometrics ,vosviewer ,hot spots and trends ,Crisis management. Emergency management. Inflation ,HD49-49.5 - Abstract
China has a population of 1.4 billion, ranking first in the world. With the increase in China's economic development and population, the construction of various types of buildings in China is also increasing, and associated safety hazards are gradually increasing. Therefore, it is necessary to study the safe evacuation of people inside and outside the building in emergency situations. In recent years, some scholars have used the traditional statistical method of literature review to analyze the research frontiers in the field of safety evacuation, but few scholars have used bibliometric methods to analyze and review the current situation of research in this field. Therefore, this paper adopts the analysis method combining bibliometrics and traditional literature review to summarize the research status of crowd evacuation published by Chinese scholars in the Web of Science core database, and uses VOSviewer to analyze the authors, institutions, and keywords of the literature search results, so as to identify their research hotspots. The results show that the last three years have been the peak period of crowd evacuation studies, with many disciplines involved in this field and they are closely related, led by the number of papers related to architecture. Simulation, model, behavior, among others, have been the most used keywords in this research field, and the research on path planning and exit selection behavior has also increased significantly. According to the keyword analysis, three hot spots of safety evacuation research, namely large-scale group evacuation, evacuation path planning and evacuation exit selection are analyzed in detail.
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- 2023
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9. A flame retardant containing dicyandiamide and aluminum hypophosphite for polyethylene
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Wenqing Yang, Wanyi Zhang, Dong Xie, Yi Wang, Xiaoyan Sun, Ru Zhou, and Juncheng Jiang
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Polyethylene ,Aluminum hypophosphite ,Dicyandiamide ,Flame retardancy ,Materials of engineering and construction. Mechanics of materials ,TA401-492 - Abstract
Polyethylene (PE) is a widely used industrial plastic, but its flammable feature limits its further application. A novel composite based on dicyandiamide (DICY) and aluminum hypophosphite (AHP) was integrated into PE. FT-IR confirmed the chemical structures of the composite. During vertical burning and limiting oxygen index tests, the UL-94 flame retardant grade reached level V-0 and the LOI index increased from 18.8 % to 26.3 % when the ratio of AHP and DICY was 4: 1 (occupying 20 wt% of PE). The CCT tests showed the peak heat release rate of 4-AHP/DICY (AHP: DICY = 4: 1) decreased from 620.3 to 323.4 kW/m2 compared with pure PE. Moreover, the carbon residue of 4-AHP/DICY was higher than that of other samples. After cone calorimetry tests, a compact and stable carbon layer formed on the surface of PE composites through the digital photographs and SEM images of the char residue.
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- 2023
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10. Preparation and Study on the Flame-Retardant Properties of CNTs/PMMA Microspheres
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Lanjuan Xu, Juncheng Jiang, Xinlei Jia, Yingying Hu, Lei Ni, Chao Li, and Wenjie Guo
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Chemistry ,QD1-999 - Published
- 2021
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11. Spread behavior of spill fire under lateral wind and temperature distribution of PE sandwich panels on facade
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Tianran Wu, Ru Zhou, Yipeng Zhang, Chenxi Huang, Zhihao Chen, and Juncheng Jiang
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PE sandwich panel ,Flame height ,Temperature distribution ,Horizontal flame propagation length ,Materials of engineering and construction. Mechanics of materials ,TA401-492 - Abstract
This study examines the spreading behavior of window spill fire under the action of lateral wind and its influence on the temperature distribution of polyethylene sandwich panels on the outer surface of buildings. Twelve working conditions were set up based on different opening sizes and wind speeds. Under the action of lateral wind, with a constant opening size, this study has found greater wind speed, lower average flame height, and longer horizontal flame propagation length. This study is based on the feature-length. The facade flame height model without wind was developed, and the average flame height model under extreme conditions was established based on the speculation of a lateral wind Froude number. In addition, under constant opening size, the peak surface temperature of the PE sandwich panel is the highest when the wind speed is 1 m/s. These conclusions are of great significance for fire studies.
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- 2022
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12. Preparation of a cobalt metal-organic framework (Co-MOF) and its application as a polypropylene flame retardant by compounding with melamine polyphosphate
- Author
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Ya Xu, Ru Zhou, Gang Ma, Lisha Deng, Huimin Liu, Yanming Ding, and Juncheng Jiang
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Polypropylene ,Cobalt metal-organic framework ,Melamine polyphosphate ,Flame retardant ,Polymers and polymer manufacture ,TP1080-1185 - Abstract
A cobalt metal-organic framework (Co-MOF) was successfully prepared, and its combination with melamine polyphosphate (MPP) was studied to enhance the fire retardant properties of polypropylene (PP) composites. The morphology, composition, and structure of PP/MPP/Co-MOF composites were characterized by scanning electron microscopy, Fourier-transform infrared spectroscopy, and X-ray photoelectron spectroscopy. The maximum limiting oxygen index of the PP/MPP/Co-MOF composite was 26.8%, which is 49% higher than that of pure PP and its combustion grade reached the V-0 level. When 2 wt% Co-MOF was added, the carbon residue of the composite reached 19.6 wt%, peak heat release rate was significantly reduced, smoke emission was suppressed, fire growth index was significantly reduced, and the fire risk of the composite was effectively reduced. Analysis of the carbon residue showed that aggregated carbon spheres were present on the carbon residue surface of the composite material supplemented with Co-MOF. The generation of carbon spheres effectively prevented the heat exchange and release of combustible gas during the combustion of the composite material, significantly improving the flame retardancy and stability of the material. As a new material, MOF has great innovation and necessity in researching polymer flame retardant. Moreover, the latest composite materials synthesized in this paper contribute to environmental safety to a great extent.
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- 2022
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13. Physical model experiment on the influence of water depth on the underwater pipeline surface impacted by landslide surge
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Hong Ji, Weikang Liu, Ke Yang, Juncheng Jiang, Zhixiang Xing, Yaxin Wang, and Shuhua Zhao
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Medicine ,Science - Abstract
Abstract A physical model experiment of flume block landslide was used to study the influence of landslide surge impact on underwater pipeline surface under different water depths. The influence of surge impact pressure on pipelines with different water depths and the impact pressure of surge at different angles of underwater pipelines wall were analyzed. And the relationship between the maximum impact pressure of underwater pipelines and the depth of water was obtained. The results indicated that with the decrease of the water depths, the maximum impact pressure at the wall of the underwater pipeline increases approximately linearly, and the slider is easier to form higher first wave height. The maximum impact pressure of the upper surface of the pipeline wall is greater than that of the lower surface of the pipeline wall under the same working conditions. It is also found that the smaller the depth of water, the larger the maximum pressure and average pressure at the measuring point would be and the greater the pressure fluctuation becomes when slider volume and landslide water inlet angle and speed remain the same.
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- 2021
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14. Multi-element synergistic effects to improve the flame retardancy of high impact polystyrene
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Xiaoyan Sun, Chenxi Huang, Zhihao Chen, Ru Zhou, and Juncheng Jiang
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High impact polystyrene ,Nano-silica ,Nitrogen-phosphorus-silicon flame retardant ,Combustion performance analysis ,Polymers and polymer manufacture ,TP1080-1185 - Abstract
Pure high impact polystyrene (HIPS) is widely used, but it is flammable. During combustion, it produces black smoke, drips, and poses other hazards to human safety, making it necessary to study flame-retardant HIPS. In this study, nitrogen-phosphorus-silicon flame retardants were prepared by using melamine cyanurate (MC), aluminum hypophosphite (ALHP), and nano-silica (nano-SiO2) to improve the flame retardancy of HIPS. The flame retardancy and mechanism of HIPS composites were studied. The results showed that when the ratio of MC to ALHP was 1:4 and nano-SiO2 was 1.5 wt%, the limiting oxygen index (LOI) value of HIPS composite was 26.9%, and PHRR and THR were reduced to 254 kW/m2 and 85 MJ/m2, respectively. The smoke production decreased by 32%, and the carbon residue increased by 70%. ALHP and nano-SiO2 mainly play a flame retardant role in the condensed phase. MC mainly plays a flame retardant role in the gas phase, as well as the condensed phase.
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- 2022
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15. The Synthesis and Polymer-Reinforced Mechanical Properties of SiO2 Aerogels: A Review
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Wang Zhan, Le Chen, Qinghong Kong, Lixia Li, Mingyi Chen, Juncheng Jiang, Weixi Li, Fan Shi, and Zhiyuan Xu
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silica aerogels ,polymer ,mechanical properties ,crosslinking ,Organic chemistry ,QD241-441 - Abstract
Silica aerogels are considered as the distinguished materials of the future due to their extremely low thermal conductivity, low density, and high surface area. They are widely used in construction engineering, aeronautical domains, environmental protection, heat storage, etc. However, their fragile mechanical properties are the bottleneck restricting the engineering application of silica aerogels. This review briefly introduces the synthesis of silica aerogels, including the processes of sol–gel chemistry, aging, and drying. The effects of different silicon sources on the mechanical properties of silica aerogels are summarized. Moreover, the reaction mechanism of the three stages is also described. Then, five types of polymers that are commonly used to enhance the mechanical properties of silica aerogels are listed, and the current research progress is introduced. Finally, the outlook and prospects of the silica aerogels are proposed, and this paper further summarizes the methods of different polymers to enhance silica aerogels.
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- 2023
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16. The Cytotoxicity of Tungsten Ions Derived from Nanoparticles Correlates with Pulmonary Toxicity
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Jun Yao, Pengfei Zhou, Xin Zhang, Beilei Yuan, Yong Pan, and Juncheng Jiang
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tungsten carbide nanoparticles ,epithelial cells ,macrophages ,cytotoxicity ,Chemical technology ,TP1-1185 - Abstract
Tungsten carbide nanoparticles (nano-WC) are prevalent in composite materials, and are attributed to their physical and chemical properties. Due to their small size, nano-WC particles can readily infiltrate biological organisms via the respiratory tract, thereby posing potential health hazards. Despite this, the studies addressing the cytotoxicity of nano-WC remain notably limited. To this purpose, the BEAS-2B and U937 cells were cultured in the presence of nano-WC. The significant cytotoxicity of nano-WC suspension was evaluated using a cellular LDH assay. To investigate the cytotoxic impact of tungsten ions (W6+) on cells, the ion chelator (EDTA-2Na) was used to adsorb W6+ from nano-WC suspension. Subsequent to this treatment, the modified nano-WC suspension was subjected to flow cytometry analysis to evaluate the rates of cellular apoptosis. According to the results, a decrease in W6+ could mitigate the cellular damage and enhance cell viability, which indicated that W6+ indeed exerted a significant cytotoxic influence on the cells. Overall, the present study provides valuable insight into the toxicological mechanisms underlying the exposure of lung cells to nano-WC, thereby reducing the environmental toxicant risk to human health.
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- 2023
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17. Predicting Thermal Decomposition Temperature of Binary Imidazolium Ionic Liquid Mixtures from Molecular Structures
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Hongpeng He, Yong Pan, Jianwen Meng, Yongheng Li, Junhong Zhong, Weijia Duan, and Juncheng Jiang
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Chemistry ,QD1-999 - Published
- 2021
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18. Risk Assessment of Urban Gas Pipeline Based on Different Unknown Measure Functions
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Kai Sheng, Xiaolin Lai, Yong Chen, Juncheng Jiang, and Lin Zhou
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credible degree recognition criteria ,risk assessment ,unascertained measure ,unknown measure function ,urban gas pipeline ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
Several risk factors threaten the safety of urban gas pipeline. How to effectively identify various risk factors affecting urban gas pipeline and put forward scientific risk assessment method is the focus in the field of urban safety research. To explore the uncertain factors in the process of gas pipeline risk assessment, and propose a practical assessment method, a three-layer index system for the risk assessment of urban gas pipeline was established using unascertained measure theory, which included 5 first-class evaluation factors and 34 second-class evaluation indexes. Four unascertained measure models (linear, parabolic, exponential and sinusoidal) were constructed, and the unascertained measure values of each evaluation index under four unknown measure function models were calculated. The weight of evaluation factors was determined by Analytic Hierarchy Process (AHP), and the confidence criterion was used for discriminant evaluation. Results demonstrate that the risk assessment models constructed with different measurement functions can effectively reduce the uncertainty of urban gas pipeline risk assessment, but for the same object, the risk level of the linear measurement model in 4# pipeline is lower than other measurement functions, and the risk level of sinusoidal measurement model in 8# pipeline is higher than other measurement functions. Therefore, considering the evaluation results under different measure functions and focusing on monitoring objects with different results is necessary when using unascertained measure theory for risk assessment. The conclusions obtained from this study clarify the application conditions of unascertained measure theory in urban gas pipeline risk assessment, which helps to reduce the uncertainty in the assessment process and improve the accuracy of the assessment results.
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- 2021
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19. Theoretical Studies on the Performance of HMX with Different Energetic Groups
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Lina Hao, Xuqin Liu, Diandian Zhai, Lei Qiu, Congming Ma, Peng Ma, and Juncheng Jiang
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Chemistry ,QD1-999 - Published
- 2020
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20. Synergistic Effect of the Total Acid Number, S, Cl, and H2O on the Corrosion of AISI 1020 in Acidic Environments
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Shuoxun Shen, Zhirong Wang, Juncheng Jiang, Xingyan Cao, Peipei Sun, Yawei Lu, and Rongrong Yang
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Chemistry ,QD1-999 - Published
- 2020
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21. Theoretical Study on CL-20-Based Cocrystal Energetic Compounds in an External Electric Field
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Lina Hao, Jinpeng Wang, Diandian Zhai, Peng Ma, Congming Ma, Yong Pan, and Juncheng Jiang
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Chemistry ,QD1-999 - Published
- 2020
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22. Influence of graphene on fire protection of intumescent fire retardant coating for steel structure
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Wang Zhan, Le Chen, Zhaozhan Gu, and Juncheng Jiang
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Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 - Abstract
Graphene (GR) was used as filler to improve the performance of fire resistance, thermal stability, smoke suppression of waterborne intumescent fire-retardant coating. The influence of graphene (GR) on the properties of the intumescent fire-retardant coating was studied by fire protection test, TGA, SEM and smoke density test. The results showed that the GR can effectively enhanced the performance of fire resistance and thermal stability of the coating. The result of SEM test indicated the coating with GR had excellent intumescent effect and enhanced foam structure. The smoke density test of the coating demonstrated the coating contain GR had excellent performance of smoke suppression. Keywords: Graphene, Fire resistance, Coating, Steel structure
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- 2020
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23. Prediction and Construction of Energetic Materials Based on Machine Learning Methods
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Xiaowei Zang, Xiang Zhou, Haitao Bian, Weiping Jin, Xuhai Pan, Juncheng Jiang, M. Yu. Koroleva, and Ruiqi Shen
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energetic material ,machine learning ,materials discovery and prediction ,data augmentation ,computer-learned representation ,Organic chemistry ,QD241-441 - Abstract
Energetic materials (EMs) are the core materials of weapons and equipment. Achieving precise molecular design and efficient green synthesis of EMs has long been one of the primary concerns of researchers around the world. Traditionally, advanced materials were discovered through a trial-and-error processes, which required long research and development (R&D) cycles and high costs. In recent years, the machine learning (ML) method has matured into a tool that compliments and aids experimental studies for predicting and designing advanced EMs. This paper reviews the critical process of ML methods to discover and predict EMs, including data preparation, feature extraction, model construction, and model performance evaluation. The main ideas and basic steps of applying ML methods are analyzed and outlined. The state-of-the-art research about ML applications in property prediction and inverse material design of EMs is further summarized. Finally, the existing challenges and the strategies for coping with challenges in the further applications of the ML methods are proposed.
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- 2022
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24. Geographical discrimination of ethanol based on stable isotope ratio analysis coupled with statistical methods: The Chinese case study
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Teng Su, Chang Liu, Jingjing Mu, Ru Zhou, and Juncheng Jiang
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Traceability of chemicals ,Ethanol ,Stable isotope ratios ,PCA ,K-NN ,Geographic origin ,Environmental pollution ,TD172-193.5 ,Environmental sciences ,GE1-350 - Abstract
The demand for the effective traceability of hazardous chemicals is crucial for preventing and controlling chemical spills and other accidents involving hazardous chemicals. The aim of the study was to investigate the correlation between the geographical location of ethanol-producing industrial sites and the carbon, hydrogen, and oxygen stable isotope ratios of the Chinese-manufactured ethanol using statistical classification analysis to enable the traceability of the ethanol. The isotopic data of 54 ethanol samples obtained from 18 different ethanol manufacturing plants in China between 2019 and 2020. The results of the statistical analysis demonstrated that the δ18O values of the ethanol positively correlated with latitudes of the production plants but negatively correlated with the δ13C values of the ethanol. A small number of samples derived from sites that were geographically close to each other could not be visually distinguished by PCA and HCA. However, by applying and comparing the results of classification by LDA, K-NN and Ensemble, an optimal classification model was obtained. Upon application of these models, 96.3% of the ethanol samples were correctly classified based on their geographical origin, indicating that the combination of isotopic ratios and latitude data is practical and effective for measuring the traceability of ethanol.
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- 2021
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25. Study on explosion characteristics and self-suppression mechanism of R404A refrigerant in closed container under oxygen-enriched condition
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Xinming Qian, Ruoheng Zhang, Mengqi Yuan, Qi Zhang, and Juncheng Jiang
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R404A refrigerant ,Oxygen-enriched condition ,Explosion characteristics ,Evolution law ,Self-suppression mechanism ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
It is an urgent problem to explore the explosion characteristics and self-suppression mechanism of R404A refrigerant, because R404A refrigerant is widely used in daily life, the combustion and explosion mechanism of it is more complex and the related explosion accidents gradually appear. Based on theoretical analysis and experimental research methods, the explosion characteristics of R404A refrigerant with the main components of trifluoroethane (C2H3F3), tetrafluoroethane (C2H2F4), and pentafluoroethane (C2HF5) under an oxygen-enriched condition under normal temperature and atmospheric pressure were revealed. The flammability limit, critical oxygen content and explosion characteristic parameters of R404A refrigerant under different oxygen content were further revealed. The evolution law of explosion parameters of R404A refrigerant in an atmosphere with different oxygen and nitrogen ratios was obtained, and the self-suppression mechanism of R404A refrigerant was explored. The results can provide some guidance for the safe use of refrigerants and the establishment of relevant industry standards.
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- 2021
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26. Experimental Investigation of the Self-Ignition and Jet Flame of Hydrogen Jets Released under Different Conditions
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Xuhai Pan, Weiyang Yan, Yiming Jiang, Zhilei Wang, Min Hua, Qingyuan Wang, and Juncheng Jiang
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Chemistry ,QD1-999 - Published
- 2019
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27. An Inverse Transient Nonmetallic Pipeline Leakage Diagnosis Method Based on Markov Quantitative Judgment
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Yongmei Hao, Yifei Ma, Juncheng Jiang, Zhixiang Xing, Lei Ni, and Jian Yang
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Materials of engineering and construction. Mechanics of materials ,TA401-492 - Abstract
Aiming at the problems of early leakage monitoring of urban nonmetallic pipelines and the large positioning error, an inverse transient urban nonmetallic gas pipelines leakage location method based on Markov quantitative judgment was proposed. A Markov flow state transition probability matrix was established based on the flow data under different pressures obtained by experiments to quantitatively determine the pipeline leakage status. On this basis, an inverse transient leakage control equation suitable for urban nonmetallic gas pipeline leakage location was constructed according to the actual. The difference between the pressure and the calculated pressure was sought for the objective function. Finally, the objective function was optimized in conjunction with the sequential quadratic programming (SQP) method to obtain the actual leakage parameters and calculate the size and location of the leakage source. The results show that the inverse transient leakage localization method based on Markov’s quantitative judgment can more accurately determine the leakage status of the pipeline and calculate the early leakage parameters and leakage location of the gas pipeline, which improves the positioning accuracy.
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- 2020
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28. Research on Multipoint Leak Location of Gas Pipeline Based on Variational Mode Decomposition and Relative Entropy
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Yongmei Hao, Zhanghao Du, Juncheng Jiang, ZhiXiang Xing, Xinming Yan, Shuli Wang, and Yongchao Rao
- Subjects
Physics ,QC1-999 - Abstract
Pipeline leak detection has always been a relatively difficult technical problem; especially in urban pipeline leak detection, there are still many problems to be solved. A multipoint leak detection and location method for urban gas pipelines based on variational mode decomposition and relative entropy was proposed. Firstly, the experiment pipeline system was built, and the original signal was collected by acoustic emission technology; then, a variational model method was used to decompose the signal to obtain multiple intrinsic mode function (IMF) components with different characteristic scales. According to the characteristics of relative entropy, each component was analyzed, the appropriate IMF component was selected, and the selected component was reconstructed to obtain the observation signal. The multipoint leakage location model of the urban gas pipeline was established. The number of source signals was estimated by singular value decomposition, and the leakage signals were separated; finally, the accurate location of leakage point was achieved by cross-correlation positioning. The results showed that the average relative error of the pipeline leak location results is 2.97%, and the leak location accuracy is significantly improved, achieving the purpose of precise location.
- Published
- 2020
- Full Text
- View/download PDF
29. Experimental Study of the Thermal Decomposition Properties of Binary Imidazole Ionic Liquid Mixtures
- Author
-
Fan Yang, Xin Zhang, Yong Pan, Hongpeng He, Yuqing Ni, Gan Wang, and Juncheng Jiang
- Subjects
binary imidazole ionic liquid mixtures ,thermal decomposition temperature ,flash ignition temperature ,Organic chemistry ,QD241-441 - Abstract
Ionic liquids (ILs) have a wide range of applications, owing to their negligible vapor pressure, high electrical conductivity, and low melting point. However, the thermal hazards of ILs and their mixtures are also non-negligible. In this study, the thermal hazards of various binary imidazolium ionic liquids (BIIL) mixtures were investigated. The effects of parent salt components and molar ratios on the thermal decomposition temperature (Td) and flashpoint temperature (Tf) are investigated. It is found that both Td and Tf increase as the proportion of highly thermally stable components in BIIL mixtures increases. Furthermore, the decomposition process of BIIL mixtures can be divided into two stages. For most molar ratios, the Tf of the BIIL mixtures is in the first stage of thermal decomposition. When the proportion of highly thermally stable components is relatively high, Tf is in the second stage of thermal decomposition. The flammability is attributed to the produced combustible gases during the thermal decomposition process. This work would be reasonably expected to provide some guidance for the safety design and application of IL mixtures for engineering.
- Published
- 2022
- Full Text
- View/download PDF
30. Pattern formation of a Schnakenberg-type plant root hair initiation model
- Author
-
Yanqiu Li and Juncheng Jiang
- Subjects
schnakenberg-type model ,pattern formation ,global bifurcation ,steady state solution ,hopf bifurcation ,turing bifurcation ,Mathematics ,QA1-939 - Abstract
This paper concentrates on the diversity of patterns in a quite general Schnakenberg-type model. We discuss existence and nonexistence of nonconstant positive steady state solutions as well as their bounds. By means of investigating Turing, steady state and Hopf bifurcations, pattern formation, including Turing patterns, nonconstant spatial patterns or time periodic orbits, is shown. Also, the global dynamics analysis is carried out.
- Published
- 2018
- Full Text
- View/download PDF
31. Effect of Nano-SiO2 on Expression and Aberrant Methylation of Imprinted Genes in Lung and Testis
- Author
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Beilei Yuan, Huazhong Zhang, Xuan Wang, Yong Pan, and Juncheng Jiang
- Subjects
Nanoparticle ,Lung ,Testis ,Methylation ,Materials of engineering and construction. Mechanics of materials ,TA401-492 - Abstract
Abstract Nanotechnology has been developing rapidly and is now used in many cutting-edge medical therapeutics. However, there is increasing concern that exposure to nanoparticles (NPs) may induce different systemic diseases as epigenetic mechanisms are associated with more and more disease. The role of NP epigenomic modification is important to disease etiology. Our study aimed to determine the epigenetic mechanisms of damage in lung and testis cells by exposing cells to SiO2 NPs. We used male C57BL/6 mice to characterize the damaging effect of SiO2 NPs on lung and testis cells as well as the resulting methylation state at the imprinted Dlk1/Dio3 domain region. The A549 cells exposed to SiO2 NPs had cell apoptosis, and male mice exposed to SiO2 NPs had altered lung and testis tissues. The genes in the imprinted domains Dlk1/Dio3 region changed in both tissues; Dlk1, Rtl1, and Dio3 are upregulated in testis while Dlk1 and Dio3 are also upregulated in lung tissues. Bisulfite sequencing PCR of male adult lung and testis were mostly hypomethylated, with a few hypermethylated CpGs. These findings indicate that nanoparticles play an important role in DNA methylation of imprinted genes.
- Published
- 2018
- Full Text
- View/download PDF
32. Fire Spread Characteristics of Metal-Polyethylene Sandwich Panels
- Author
-
Ru Zhou, Zhihao Chen, Yinke Fan, Zhengjiang Yu, Jianan Qian, and Juncheng Jiang
- Subjects
metal-polyethylene sandwich panel ,fire spread rate ,flame characteristics ,bending deformation ,top flame ,Building construction ,TH1-9745 - Abstract
An experimental study was conducted to determine the characteristics of the flame spread and droplets of metal-polyethylene (PE) sandwich panels during combustion. The mass-loss rate, average flame height, temperature, and fire spread rate were investigated. The results showed that the fire spread rate, mass change of the droplets, average flame height, and temperature increased with an increase in the sample length, except for the mass loss rate of the 40 cm-long sample. The time interval between the droplets decreased, and the flame pulsation frequency increased. The relationship between the flame height and sample length was determined. During the combustion process, bending deformation and top flame phenomena occurred due to the shrinkage of the PE, which increased the fire risk. The distance between the outer surface of the expanded metal aluminum layer and the insulation panel increased with an increase in the panel length. A schematic diagram of the fire spread of the metal sandwich panel was established based on the observations and theoretical analysis. The mechanism and combustion behavior of the metal sandwich panels were determined to provide references for the construction of metal sandwich panels of exterior walls.
- Published
- 2021
- Full Text
- View/download PDF
33. Thermal Stability and Decomposition Kinetics of 1-Alkyl-2,3-Dimethylimidazolium Nitrate Ionic Liquids: TGA and DFT Study
- Author
-
Jianwen Meng, Yong Pan, Fan Yang, Yanjun Wang, Zhongyu Zheng, and Juncheng Jiang
- Subjects
ionic liquids ,1-alkyl-2,3-dimethylimidazolium nitrates ,thermal hazard ,kinetics analysis ,density functional theory calculations ,Technology ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Microscopy ,QH201-278.5 ,Descriptive and experimental mechanics ,QC120-168.85 - Abstract
The thermal stability and decomposition kinetics analysis of 1-alkyl-2,3-dimethylimidazole nitrate ionic liquids with different alkyl chains (ethyl, butyl, hexyl, octyl and decyl) were investigated by using isothermal and nonisothermal thermogravimetric analysis combined with thermoanalytical kinetics calculations (Kissinger, Friedman and Flynn-Wall-Ozawa) and density functional theory (DFT) calculations. Isothermal experiments were performed in a nitrogen atmosphere at 240, 250, 260 and 270 °C. In addition, the nonisothermal experiments were carried out in nitrogen and air atmospheres from 30 to 600 °C with heating rates of 5, 10, 15, 20 and 25 °C/min. The results of two heating modes, three activation energy calculations and density functional theory calculations consistently showed that the thermal stability of 1-alkyl-2,3-dimethylimidazolium nitrate ionic liquids decreases with the increasing length of the alkyl chain of the substituent on the cation, and then the thermal hazard increases. This study could provide some guidance for the safety design and use of imidazolium nitrate ionic liquids for engineering.
- Published
- 2021
- Full Text
- View/download PDF
34. Nano-SAR Modeling for Predicting the Cytotoxicity of Metal Oxide Nanoparticles to PaCa2
- Author
-
Haihua Shi, Yong Pan, Fan Yang, Jiakai Cao, Xinlong Tan, Beilei Yuan, and Juncheng Jiang
- Subjects
cellular uptake ,metal oxide nanoparticles ,cytotoxicity ,nano-SAR ,norm index descriptors ,Organic chemistry ,QD241-441 - Abstract
Nowadays, the impact of engineered nanoparticles (NPs) on human health and environment has aroused widespread attention. It is essential to assess and predict the biological activity, toxicity, and physicochemical properties of NPs. Computation-based methods have been developed to be efficient alternatives for understanding the negative effects of nanoparticles on the environment and human health. Here, a classification-based structure-activity relationship model for nanoparticles (nano-SAR) was developed to predict the cellular uptake of 109 functionalized magneto-fluorescent nanoparticles to pancreatic cancer cells (PaCa2). The norm index descriptors were employed for describing the structure characteristics of the involved nanoparticles. The Random forest algorithm (RF), combining with the Recursive Feature Elimination (RFE) was employed to develop the nano-SAR model. The resulted model showed satisfactory statistical performance, with the accuracy (ACC) of the test set and the training set of 0.950 and 0.966, respectively, demonstrating that the model had satisfactory classification effect. The model was rigorously verified and further extensively compared with models in the literature. The proposed model could be reasonably expected to predict the cellular uptakes of nanoparticles and provide some guidance for the design and manufacture of safer nanomaterials.
- Published
- 2021
- Full Text
- View/download PDF
35. Synergistic Effects of Graphene and Ammonium Polyphosphate Modified with Vinyltrimethoxysilane on the Properties of High-Impact Polystyrene Composites
- Author
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Xianghui Shi, Yong Pan, Yuguo Wang, Zhimeng Jia, Tingting Chen, Junhui Gong, and Juncheng Jiang
- Subjects
ammonium polyphosphate ,graphene ,high-impact polystyrene ,thermal stability ,flame retardancy ,Organic chemistry ,QD241-441 - Abstract
Ammonium polyphosphate (APP) was modified with a silane coupling agent (vinyltrimethoxysilane, Si-171), and then the synergistic flame retarding effect of graphene and surface-modified APP (APP@Si-171) on high-impact polystyrene (HIPS) was investigated. Surface modification and thermal stability characterization of APP were analyzed by Fourier transform infrared spectroscopy (FTIR), energy dispersive spectrometer (EDS), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). The results showed that surface-modified APP (APP@Si-171) exhibited significantly better dispersion and less agglomeration tendencies compared with pure APP. A series of target HIPS composites containing different mass fractions of the two flame retardants were prepared by melt blending. TGA and cone calorimeter tests (CCT) were conducted to quantitatively investigate the thermal and flammability properties of the composites, respectively. Results from TGA and CCT demonstrated that the addition of the flame retardants delayed the onset and peak temperatures in differential thermogravimetry (DTG) curves and weakened the peak heat release rate (PHRR) and total heat release (THR). Moreover, the synergistic effect index (SE) was employed to quantify the synergistic behavior between the two fillers, and the results showed that APP@Si-171 and graphene had a synergistic effect on improving the thermal stability and flame retardancy of HIPS.
- Published
- 2021
- Full Text
- View/download PDF
36. Effect of Magnesium Hydroxide and Aluminum Hydroxide on the Thermal Stability, Latent Heat and Flammability Properties of Paraffin/HDPE Phase Change Blends
- Author
-
Ru Zhou, Zhuang Ming, Jiapeng He, Yanming Ding, and Juncheng Jiang
- Subjects
phase change material ,thermal stability ,flammability properties ,metal hydroxide ,Organic chemistry ,QD241-441 - Abstract
In this study, paraffin was selected as the phase change material (PCM) and high-density polyethylene (HDPE) as the supporting material to prepare a flame-retardant PCM system. The system consisted of paraffin, HDPE, expanded graphite (EG), magnesium hydroxide (MH) and aluminum hydroxide (ATH). The thermal stability and flame retardancy were studied by thermo-gravimetric analysis (TGA), scanning electron microscopy (SEM) and cone calorimeter test (CONE). The SEM proved that the addition of MH and ATH can produce an oxide film on the surface of the composite material and form a “physical barrier” with the char layer, generated by the expansion of EG, preventing the transfer of heat and oxygen. The TGA test showed that, compared with other flame-retardant systems, the materials with added MH and ATH have a higher thermal stability and carbonization ability, and the amount of char residue has increased from 17.6% to 32.9%, which reduces the fire risk of the material. The flame retardant effect is obvious. In addition, the addition of MH and ATH has no significant effect on the phase transition temperature and latent heat value of PCMs. The CONE data further confirmed that MH and ATH can work with EG to prevent heat release, reduce the total heat release rate (THR) value and effectively suppress the generation of smoke, CO and CO2. The peak heat release rate (PHRR) value also decreased, from 1570.2 kW/m2 to 655.9 kW/m2.
- Published
- 2020
- Full Text
- View/download PDF
37. Synergistic Effects of Aluminum Diethylphosphinate and Melamine on Improving the Flame Retardancy of Phenolic Resin
- Author
-
Ru Zhou, Wenjuan Li, Jingjing Mu, Yanming Ding, and Juncheng Jiang
- Subjects
phenolic resin ,aluminum diethylphosphinate ,melamine ,flame retardancy ,Technology ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Microscopy ,QH201-278.5 ,Descriptive and experimental mechanics ,QC120-168.85 - Abstract
A series of novel flame retardants (aluminum diethylphosphinate and melamine) were used to improve the fire performance of phenolic resin. Fourier transform infrared spectroscopy (FTIR) was used to characterize the modification results. Thermo-gravimetric analysis (TGA) was used to study the thermal decomposition of phenolic resin system, and the flame retardancy of phenolic resin system was tested by vertical combustion test (UL-94) and limiting oxygen index (LOI). The combustion properties of modified phenolic resin were further tested with a cone calorimeter(CCT). Finally, the structure of carbon residue layer was measured by scanning electron microscopy (SEM). The results show that with the introduction of 10 wt % aluminum diethylphosphinate in phenolic resin, the LOI reaches 33.1%, residual carbon content increase to 55%. The heat release rate (HRR) decreased to 245.6 kW/m2, and the total heat release (THR) decreased to 58.6 MJ/m2. By adding 10 wt % aluminum diethylphosphinate and 3 wt % melamine, the flame retardancy of the modified resin can pass UL-94 V-0 flame retardant grade, LOI reaches 34.6%, residual carbon content increase to 59.5%. The HRR decreases to 196.2 kW/m2 at 196 s, relatively pure phenolic resin decreased by 35.5%, and THR decreased to 51 MJ/m2. Compared with pure phenolic resin, the heat release rate and total heat release of modified phenolic resin decreased significantly. This suggests that aluminum diethylphosphinate and melamine play a nitrogen-phosphorus synergistic effect in the phenolic resin, which improves the thermal stability and flame retardancy of the phenolic resin.
- Published
- 2019
- Full Text
- View/download PDF
38. Prediction of the Auto-Ignition Temperatures of Binary Miscible Liquid Mixtures from Molecular Structures
- Author
-
Shijing Shen, Yong Pan, Xianke Ji, Yuqing Ni, and Juncheng Jiang
- Subjects
quantitative structure-property relationship (QSPR) ,auto-ignition temperature (AIT) ,simplex representation of molecular structure (SiRMS) ,binary miscible liquid mixtures ,Biology (General) ,QH301-705.5 ,Chemistry ,QD1-999 - Abstract
A quantitative structure-property relationship (QSPR) study is performed to predict the auto-ignition temperatures (AITs) of binary liquid mixtures based on their molecular structures. The Simplex Representation of Molecular Structure (SiRMS) methodology was employed to describe the structure characteristics of a series of 132 binary miscible liquid mixtures. The most rigorous “compounds out” strategy was employed to divide the dataset into the training set and test set. The genetic algorithm (GA) combined with multiple linear regression (MLR) was used to select the best subset of SiRMS descriptors, which significantly contributes to the AITs of binary liquid mixtures. The result is a multilinear model with six parameters. Various strategies were employed to validate the developed model, and the results showed that the model has satisfactory robustness and predictivity. Furthermore, the applicability domain (AD) of the model was defined. The developed model could be considered as a new way to reliably predict the AITs of existing or new binary miscible liquid mixtures, belonging to its AD.
- Published
- 2019
- Full Text
- View/download PDF
39. Prediction of Lower Flammability Limits for Binary Hydrocarbon Gases by Quantitative Structure—Property Relationship Approach
- Author
-
Yong Pan, Xianke Ji, Li Ding, and Juncheng Jiang
- Subjects
lower flammability limit ,binary hydrocarbon gases ,mixture descriptors ,quantitative structure–property relationship (QSPR) ,Organic chemistry ,QD241-441 - Abstract
The lower flammability limit (LFL) is one of the most important parameters for evaluating the fire and explosion hazards of flammable gases or vapors. This study proposed quantitative structure−property relationship (QSPR) models to predict the LFL of binary hydrocarbon gases from their molecular structures. Twelve different mixing rules were employed to derive mixture descriptors for describing the structures characteristics of a series of 181 binary hydrocarbon mixtures. Genetic algorithm (GA)-based multiple linear regression (MLR) was used to select the most statistically effective mixture descriptors on the LFL of binary hydrocarbon gases. A total of 12 multilinear models were obtained based on the different mathematical formulas. The best model, issued from the norm of the molar contribution formula, was achieved as a six-parameter model. The best model was then rigorously validated using multiple strategies and further extensively compared to the previously published model. The results demonstrated the robustness, validity, and satisfactory predictivity of the proposed model. The applicability domain (AD) of the model was defined as well. The proposed best model would be expected to present an alternative to predict the LFL values of existing or new binary hydrocarbon gases, and provide some guidance for prioritizing the design of safer blended gases with desired properties.
- Published
- 2019
- Full Text
- View/download PDF
40. Effects of Combined Surface and In‐Depth Absorption on Ignition of PMMA
- Author
-
Junhui Gong, Yixuan Chen, Jing Li, Juncheng Jiang, Zhirong Wang, and Jinghong Wang
- Subjects
surface absorption ,in‐depth absorption ,ignition ,thermal degradation ,PMMA ,Technology ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Microscopy ,QH201-278.5 ,Descriptive and experimental mechanics ,QC120-168.85 - Abstract
A one‐dimensional numerical model and theoretical analysis involving both surface and in‐depth radiative heat flux absorption are utilized to investigate the influence of their combination on ignition of PMMA (Polymethyl Methacrylate). Ignition time, transient temperature in a solid and optimized combination of these two absorption modes of black and clear PMMA are examined to understand the ignition mechanism. Based on the comparison, it is found that the selection of constant or variable thermal parameters of PMMA barely affects the ignition time of simulation results. The linearity between tig-0.5 and heat flux does not exist anymore for high heat flux. Both analytical and numerical models underestimate the surface temperature and overestimate the temperature in a solid beneath the heat penetration layer for pure in‐depth absorption. Unlike surface absorption circumstances, the peak value of temperature is in the vicinity of the surface but not on the surface for in‐depth absorption. The numerical model predicts the ignition time better than the analytical model due to the more reasonable ignition criterion selected. The surface temperature increases with increasing incident heat flux. Furthermore, it also increases with the fraction of surface absorption and the radiative extinction coefficient for fixed heat flux. Finally, the combination is optimized by ignition time, temperature distribution in a solid and mass loss rate.
- Published
- 2016
- Full Text
- View/download PDF
41. Inherent thermal runaway hazard evaluation method of chemical process based on fire and explosion index
- Author
-
Juncheng, Jiang, Dan, Wei, Lei, Ni, Gang, Fu, and Yong, Pan
- Published
- 2020
- Full Text
- View/download PDF
42. Process hazard and thermal risk evaluation of m-xylene nitration with mixed acid
- Author
-
Hang Yao, Lei Ni, Yinshan Liu, Gang Fu, Juncheng Jiang, Zhen Cheng, Yuqing Ni, and Zhiquan Chen
- Subjects
Environmental Engineering ,General Chemical Engineering ,Environmental Chemistry ,Safety, Risk, Reliability and Quality - Published
- 2023
43. Physical evidence and system theory based accident investigation of strongly constrained environments: A case study
- Author
-
Xinming Qian, Zhengrun Huang, Juncheng Jiang, Xingyu Shen, Mingzhi Li, Mengqi Yuan, and Qianran Hu
- Subjects
Environmental Engineering ,General Chemical Engineering ,Environmental Chemistry ,Safety, Risk, Reliability and Quality - Published
- 2023
44. Shock waves, overpressure, and spontaneous ignition of pressurized hydrogen in T-shaped tubes
- Author
-
Yiming Jiang, Xuhai Pan, Tao Zhang, Zhilei Wang, Xilin Wang, Qingyuan Wang, Yunyu Li, Min Hua, and Juncheng Jiang
- Subjects
Environmental Engineering ,General Chemical Engineering ,Environmental Chemistry ,Safety, Risk, Reliability and Quality - Published
- 2023
45. Organ distribution of Nano-WC particles after repeated intratracheal instillation into the lungs of SD rats and subsequent organ injury
- Author
-
Pengfei Zhou, Yong Pan, Beilei Yuan, Jiyuan Zhou, and Juncheng Jiang
- Subjects
Biophysics ,Cell Biology ,Molecular Biology ,Biochemistry - Published
- 2023
46. Predicting thermal runaway in styrene polymerization reactions: Divergence criterion with phase space reconstruction
- Author
-
Andong Yu, Juan Zhou, Min Hua, Xuhai Pan, Juncheng Jiang, and Sanming Wang
- Subjects
Environmental Engineering ,General Chemical Engineering ,Environmental Chemistry ,Safety, Risk, Reliability and Quality - Published
- 2023
47. Experimental study on methane explosion suppression by heptafluoropropane drived modified ABC powder
- Author
-
Hong Ji, Renjie Lu, Ke Yang, Juncheng Jiang, Zhixiang Xing, and Jie Guo
- Subjects
Environmental Engineering ,General Chemical Engineering ,Environmental Chemistry ,Safety, Risk, Reliability and Quality - Published
- 2023
48. Breakup regime of flashing jet under thermal nonequilibrium and mechanical forces and its relationship with jet characteristics during depressurized releases of superheated liquid
- Author
-
Xueliang Zhu, Xuhai Pan, Hao Tang, Xilin Wang, Yucheng Zhu, Lian X. Liu, Juncheng Jiang, and Tao Chen
- Subjects
Environmental Engineering ,General Chemical Engineering ,Environmental Chemistry ,Safety, Risk, Reliability and Quality - Published
- 2023
49. A Simulation Study on the Impact of Abandoned Trolley Cases on Pedestrian Evacuation
- Author
-
Dongyue Xu, Jinghong Wang, Juan Liu, Yan Wang, and Juncheng Jiang
- Subjects
Civil and Structural Engineering - Published
- 2023
50. A modified inherent thermal runaway hazard index (m-ITHI) for risk assessment of chemical processes based on cloud model
- Author
-
Feifei Chen, Dan Wei, Lei Ni, Juncheng Jiang, and Gang Fu
- Subjects
Environmental Engineering ,General Chemical Engineering ,Environmental Chemistry ,Safety, Risk, Reliability and Quality - Published
- 2023
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