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Calculation of Apparent Activation Energy of Coal Oxidation at Low Temperatures by Measuring CO Yield

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Journal of China University of Mining and Technology 2006年第1期16卷 37-41页

作者： QI Feng LI Zeng-hua pan Shang-kun ZHANG Lin School of Mining and Safety Engineering China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China

By analyzing previous studies on activation energy of coal oxidation at low temperatures, a theoretical calculation model of apparent activation energy is established. Yield of CO is measured by using the characteristic detector of coal oxidation at 30-90 ℃. The impact of parameters, such as airflow and particle size, on activation energies is analyzed. Finally, agreement was obtained between activation energies and the dynamic oxygen absorbed in order to test the accuracy of the model. The results show that： 1） a positive exponential relation between concentration of CO and temperature in the process of the experiment is obtained： increases are almost identical and the initial CO is low; 2） the apparent activation energies increase gradually with the sizes of particle at the same airflow, but the gradients increase at a decreasing rate; 3） the apparent activation energies increase linearly with airflow. For the five coal particles, the differences among the energies are relatively high when the airflow was low, but the differences were low when the airflow was high; 4） the optimum sizes of particle, 0.125-0.25 ram, and the optimum volume of airflow, 100 mL/min, are determined from the model; 5） the apparent activation energies decrease with an increase in oxygen absorbed. A negative exponential relation between the two is obtained,

关键词： coal oxidation at low temperature apparent activation energy particle size airflow

The effects of orientation control via tension-compression on microstructural evolution and mechanical behavior of AZ31 Mg alloy sheet

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Journal of Magnesium and Alloys 2022年第2期10卷 446-458页

作者： Qingshan Yang Bin Jiang Bo Song Zujian Yu Dewei He Yanfu Chai Jianyue Zhang Fusheng pan School of Metallurgy and Material Engineering Chongqing University of Science and TechnologyChongqing 401331China National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China School of Materials and Energy Southwest UniversityChongqing400715China MagIC–Magnesium Innovation Centre Helmholtz-Zentrum GeesthachtMax-Planck-Straße 1Geesthacht 21502Germany School of Engineering Technology Purdue UniversityWest LafayetteIN 47907-2021United States

The grain orientation control via twinning activity on deformation features is of great significance to offer a key insight into understanding the deformation mechanism of Mg alloy ***{10–12}twinning were performed by pre-strain paths,i.e.,tension(6%)and compression(5%)perpendicular to the c-axis along extrusion direction(ED),to investigate the microstructural evolution and mechanical properties of AZ31 Mg alloy *** distinction in the texture evolution and strain hardening behavior was illustrated in connection with the pre-strain paths for the activities of twinning and *** result shows that the activation of the deformation mode was closely bound up with the grain orientation and the additional applied load ***{10–12}twin-texture components with c-axis//ED were generated by precompression,which can provide an appropriate alternative to accommodate the thin sheet thickness strain and enhance the room temperature formability of Mg alloy sheet.

关键词： Mg alloy Orientation control Microstructural evolution Texture Stretch formability

Effect of donor age on graft function and longterm survival of recipients undergoing living donor liver transplantation

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Hepatobiliary & pancreatic Diseases International 2015年第1期14卷 50-55页

作者： Kai Wang Wen-Tao Jiang Yong-Lin Deng Cheng pan Zhong-Yang Shen Department of Transplant Surgery Tianjin First Center Hospital Key Laboratory of Organ Transplantation of Tianjin

BACKGROUND： Donor shortage is the biggest obstacle in organ transplantation. Living donor liver transplantation（LDLT） has been considered as a valuable approach to shortening waiting time. The objectives of this study were to investigate the feasibility of utilizing donors older than 50 years in LDLT and to evaluate the graft function and recipient ***： All LDLT cases（n=159） were divided into the older（donor age ≥50 years, n=10） and younger（donor age 〈50 years,n=149） donor groups. Donor graft and recipient condition pre-,intra- and post-operation were compared between the two *** particular, graft functions and recipient survivals were ***： The median donor age was 58.5（52.5-60.0） years in the older donor group and 25.0（23.0-32.0） in the younger donor group. There was no significant difference in cold ischemic time, anhepatic phase and operation time between the older and younger donor groups（P〉0.05）. However, the volume of red blood cell transfused in operation was greater in the older donor group than in the younger donor group（1900 vs 1200 m L, P=0.023）. The 1-, 3- and 5-year graft survival rates were 90%, 80% and 80% for the older donor group, and 92%, 87% and 87% for the younger donor group, respectively（P=0.459）.The 1-, 3- and 5-year survival rates were 100%, 90% and 90% for recipients with older grafts, and 93%, 87% and 87% for those with younger grafts, respectively（P=0.811）.CONCLUSION： It is safe for a LDLT recipient to receive liver from donors older than 50 years, and there is no significant adverse effect on graft function and long-term patients’ survival.

关键词： living donor liver transplantation donor age graft liver function long-term survival

Sequencing analysis of matrix metalloproteinase 7-induced genetic changes in Schwann cells

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Neural Regeneration Research 2020年第11期15卷 2116-2122页

作者： pan-Jian Lu Gang Wang Xiao-Dong Cai Ping Zhang Hong-Kui Wang Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education Co-innovation Center of NeuroregenerationNantong UniversityNantongJiangsu ProvinceChina

Previous research revealed the positive activity of matrix metalloproteinase 7(MMP7) on migration and myelin regeneration of Schwa nn cells(SCs). However, understanding of the molecular changes and biological activities induced by increased amounts of MMP7 in SCs remains limited. To better understand the underlying molecular events, primary SCs were isolated from the sciatic nerve stump of newborn rats and cultured with 10 nM human MMP7 for 24 hours. The results of genetic testing were analyzed at a relatively relaxed threshold value(fold change ≥ 1.5 and P-value < 0.05). Upon MMP7 exposure, 149 genes were found to be upregulated in SCs, whereas 133 genes were downregulated. Gene Ontology analysis suggested that many differentially expressed molecules were related to cellular processes, single-organism processes, and metabolic processes. Kyoto Enrichment of Genes and Genomes pathway analysis further indicated the critical involvement of cell signaling and metabolism in MMP7-induced molecular regulation of SCs. Results of Ingenuity Pathway Analysis(IPA) also revealed that MMP7 regulates biological processes, molecular functions, cellular components, diseases and functions, biosynthesis, material metabolism, cell movement, and axon guidance. The outcomes of further analysis will deepen our comprehension of MMP7-induced biological changes in SCs. This study was approved by the Laboratory Animal Ethics Committee of Nantong University, China(approval No. 20190225-004) on February 27, 2019.

关键词： bioinformatic analysis ingenuity pathway analysis matrix metalloproteinase 7 peripheral nerve regeneration RNA sequencing Schwann cells sciatic nerve injury

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膜表面嵌段接枝聚合物刷制备离子识别膜

北京化工大学学报（自然科学版） 2015年第1期42卷 69-73页

作者：尹雪宇曹兵姜敏潘凯北京化工大学材料科学与工程学院碳纤维及功能高分子教育部重点实验室北京100029

采用原子转移自由基聚合(ATRP)方法,首先在聚对苯二甲酸乙二醇酯(PET)径迹-刻蚀膜表面接枝聚合物N-异丙基丙烯酰胺(NIPAM),然后二次接枝甲基丙烯酸羟乙酯(HEMA),最后用具有离子识别功能的5-胺基-1,10-邻菲罗啉(5-N-1,10-Phen)对HEMA进... 详细信息

采用原子转移自由基聚合(ATRP)方法,首先在聚对苯二甲酸乙二醇酯(PET)径迹-刻蚀膜表面接枝聚合物N-异丙基丙烯酰胺(NIPAM),然后二次接枝甲基丙烯酸羟乙酯(HEMA),最后用具有离子识别功能的5-胺基-1,10-邻菲罗啉(5-N-1,10-Phen)对HEMA进行封端,制备出具有两嵌段聚合物刷结构的离子识别功能膜。通过傅里叶变换全反射红外光谱(ATR FT-IR)、X-射线电子能谱(XPS)、扫描电子显微镜(SEM)以及接触角测试仪等手段对所制备的膜进行了表征,同时考察了所制备功能膜对溶液中Cu2+的吸附能力。结果表明,通过ATRP方法能够将NIPAM和HEMA链段嵌段接枝在PET膜表面形成聚合物刷,采用的邻菲罗啉能够对HEMA进行封端,且所制备的膜对Cu2+具有吸附作用。

关键词：原子转移自由基聚合(ATRP) 功能膜离子识别 PET径迹-刻蚀膜邻菲罗啉

Characterization of the Promoter of a Homolog of Maize MADS-Box Gene m18

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Journal of Integrative Agriculture 2014年第11期13卷 2330-2345页

作者： QIN Hui-juan pan Hong FAN Xian-wei WU Qiao LI You-zhi Key Laboratory for Microbial and Plant Genetic Engineering Ministry of Education/State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources Ministry of Science and Technology/College of Life Science and Technology Guangxi University

Maize （Zea mays L.） is one of the world’s major food crops, and often suffers from tremendous yield loss caused by abiotic stresses. The MADS-box genes are known to play versatile roles in plants, controlling plant responses to multiple abiotic stresses. However, understanding of regulation of their expressions by the conventional loss-of-function approach is very dififcult. So far, regulation of MADS-box gene expression is little known. The best approach to retrieve expression regulation of this category of genes is to characterize expression of their promoters. In this study, the promoter of a homolog （GenBank accession no. EC864166） of maize MADS-box gene m18 was cloned by way of genome-walking PCR, named Pro66. Predicative analysis indicated that Pro66 contains more than one TATA box and multiple cis-acting environmental conditions-responsive elements （ECREs）. Pro66 could drive expression of theβ-glucuronidase （GUS）-encoding gene in maize, and heterologous expression of GUS in red pepper stressed by water deifcit, salt, copper, iron deifciency, heat, cold, and grown under short and long photoperiods, echoing predicative ECREs. Conclusively, maize MADS-box gene m18 likely plays versatile functions in maize response to multiple abiotic stresses due to the promoter with multiple cis-acting elements. The complex arrangement of multiple cis-acting elements in the promoter features meticulously regulated expression of m18. The results give informative clues for heterologous utilisation of the promoters in monocot and dicot species. The copy of the ECREs and heterologous expression of the promoter in dicot species are also discussed.

关键词： maize MADS-box gene promoter stress transcription

A non-nucleophilic electrolyte based on all-inorganic salts with conditioning-free characteristic for rechargeable magnesium batteries

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Journal of Magnesium and Alloys 2024年第8期12卷 3357-3369页

作者： Jiaxin Wen Jingdong Yang Xueting Huang Xin Zhang Guangsheng Huang Jingfeng Wang Lingjie Li Fusheng pan Chongqing Industry Polytechnic College Chongqing 401120PR China National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044PR China School of Chemistry and Chemical Engineering Chongqing UniversityChongqing 400044PR China

Conditioning-free electrolytes with high reversibility of Mg plating/stripping are of vital importance for the commercialization of the superior rechargeable magnesium batteries(RMBs).In the present work,a non-nucleophilic electrolyte(denoted as MLCH)based on all-inorganic salts of MgCl_(2),LiCl and CrCl_(3) for RMBs is prepared by a straightforward one-step *** a result,the MLCH electrolyte shows the noticeable performance of high ionic conductivity(3.40 mS cm^(−1)),low overpotential(∼46 mV vs Mg/Mg^(2+)),high Coulombic efficiency(∼93%),high anodic stability(SS,∼2.56 V vs Mg/Mg^(2+))and long-term(more than 500 h)cycling stability,especially the conditioning-free *** main equilibrium species in the MLCH electrolyte are confirmed to be the tetracoordinated anions of[LiCl2(THF)2]−and solvated dimers of[Mg_(2)(μ-Cl)3(THF)6]+.The addition of LiCl can assist the dissolution of MgCl_(2) and activation of the electrode/electrolyte interface,resulting in a superior Mg plating/stripping *** synergistic effect of LiCl,CrCl_(3),a small amount of HpMS and the absence of polymerization THF enable the conditioning-free characteristic of the MLCH ***,the MLCH electrolyte exhibits decent compatibility with the cathodic materials of *** Mg/CuS full cell using the MLCH electrolyte presents a discharge specific capacity of 215 mAh g^(−1)at 0.1 C and the capacity can retain∼72%after 40 ***,the MLCH electrolyte has other superiorities such as the broad sources of materials,low-cost and easy-preparation,leading to the potential prospect of commercial application.

关键词： Rechargeable magnesium batteries Non-nucleophilic electrolyte All-inorganic salt Conditioning-free Mg plating/stripping

Numerical simulation for recognition of coalfield fire areas by Rayleigh waves

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International Journal of Mining Science and Technology 2013年第1期23卷 27-31页

作者： Hu Mingshun pan Dongming Chen Shenen Dong Shouhua Li Juanjuan School of Resource and Geosciences China University of Mining & Technology Department of Civil and Environmental Engineering University of North Carolina at Charlotte Charlotte NC 28223 USA State Key Laboratory of Geomechanics & Deep Underground Engineering China University of Mining & Technology

Effective recognition of a coalfield fire area improves fire-fighting efficiency and helps avoid potential geological hazards. Coalfield fire areas are hard to detect accurately using general geophysical methods. This paper describes simulations of shallow, buried coalfield fires based on real geological conditions. Recognizing the coalfield fire by Rayleigh wave is proposed. Four representative geological models are constructed, namely; the non-burning model, the pseudo-burning model, the real-burning model, and the hidden-burning model. Numerical simulation using these models shows many markedly different characteristics between them in terms of Rayleigh wave dispersion and Eigen displacement. These characteristics, as well as the shear wave velocity obtained by inverting the fundamental dispersion, make it possible to distinguish the type of the coalfield fire area and indentify the real and serious coalfield fire area. The results are very helpful for future application of Rayleigh waves for the detection of coalfield fire area.

关键词： Coalfield fire area Rayleigh wave Dispersion Eigen displacement Dispersion inversion

Study on fault source diagnosis technology and air velocity trans- ducers placement for underground

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Journal of Coal Science & Engineering(China) 2012年第1期18卷 67-72页

作者： Dan Zhao Jian Liu Jing-tao pan College of Safety Science and Engineering Liaoning Technical University Fuxin China Department of Mechanical Engineering Southeast University Nanjing China

The current mine safety monitoring system used can only get the air volume change of roadway placed air velocity transducers, as this change is caused by this roadway, or for other roadway, and fault source has one point or more, which be- longs to the problem of fault source diagnosis for ventilation system. Ventilation system fault can be attributed to the variation of air resistance of branch in the entire network. If the changes of air resistance for each branch in ventilation system are ana- lyzed, then it is impossible to place air velocity transducers in every branch. Therefore, the problem of the minimum quantities and location for placing air velocity transducers should be mainly studied. The relationship of air resistance and air volume variation of matrix method has been proposed, which can reflect the variation relationship between the air volume of the branch and air resistance of the relevant branches. Fault roadway range library of ventilation network built to determine fault roadway range will cause air velocity to exceed the limit. Minimum and full coverage of distribution method has been proposed, and the concept of branch coverage degree and impact roadway range library has also been brought forword to get the macro-distribution of air velocity transducers.

关键词： fault source air velocity transducers mine ventilation branch