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Kinetic calculations for the thermal decomposition of calcium propionate under non-isothermal conditions

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Chinese Science Bulletin 2011年第12期56卷 1278-1284页

作者： niu ShengLi han KuiHua LU ChunMei National Engineering Laboratory for Coal-Burning Pollutants Emission Reduction Shandong University Jinan 250061 China

Calcium propionate (CP) is shown to be useful for simultaneous SO2/NO reduction in coal-fired power plants and its thermal decomposition characteristics are measured by thermogravimetric analysis in a feasibility study into more complete reduction of these hazardous gases. Calcium carbonate (CC), which has been used primarily for in-furnace desulfuration, was used for comparison. The thermal decomposition of this organic calcium-based sorbent began at low temperature, i.e. the carboxylic radical was evaporated from 565 K to 759 K for CP and the corresponding mass loss percentage was 47.79%. The residual was subsequently decomposed to release carbon dioxide between 843 K and 1012 K. The latter phase of the process occurred more readily than with CC because of the loose structure of CP resulting from evaporation of the carboxylic radical in the low temperature zone, which could be seen directly by scanning electron microscope. The maximum mass loss rates of this phase occurred at temperatures of 972 K and 1012 K for CP and CC, respectively. The Ozawa-Flynn-Wall method was used to calculate the activation energy during the thermal decomposition process at heating rates of 5, 7.5, 10 and 15 K/min. The result further confirmed the multistage characteristic of CP thermal decomposition, which could be seen in differential thermogravimetry curves. The reaction orders of CP in the conversion range 20%-80%, calculated using the Avrami theory were from 0.061 to 0.608, smaller than those of CC, which were 1.647 to 2.084.

关键词：热分解特性动力学计算丙酸钙非等温条件 Avrami理论扫描电子显微镜质量损失率钙基吸附剂

Adsorption Properties of Calcined Modified Sepiolite on SO4^2- and Cl^-

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Journal of Wuhan University of Technology(Materials Science) 2020年第1期35卷 32-41页

作者：孙凯利王彩辉 ZhanG Guanglei niu han FU Shifeng WU Yueze YANG Jinhui State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuang 050043China Hebei Institute of Technology Co. Ltd.ShiJiaZhuang 050021China

Three different kinds of sepiolite(Type A, Type B and Sepiolite fiber) were processed by calcination and analyzed by thermogravimetric analysis(TG), X-ray diffraction diffractometer(XRD), scanning electron microscopy(SEM), BET(specific surface area from N2 adsorption isotherms), mercury intrusion porosimetry(MIP), and infrared spectroscopic analysis(IR), respectively. The results show that the adsorption performance of sepiolite can be changed by calcination and environment temperatures, especially for calcination. The adsorption capacity of sepiolite fiber is bigger than that of Type A and B, and adsorption capacity of each sepiolite to sulfate is smaller than that of the chloride ions. Especially, the maximum value for adsorption of the sepiolite fibers, calcined at 600 ℃ and water bath at 60 ℃, to chlorine ion and sulfate are 5.95 and 5.71 mg/g, respectively(mg/g : the ions quantity adsorbed by a unit of sepiolite weight). The minimum adsorption of calcined sepiolite fiber to sulfate ions increased from 5.02 to 5.55 mg/g. While microstructure analysis of sepiolite by TG indicated that its structure was, for temperature not exceeding 700 ℃, was not changed significantly. Sepiolite has a porous structure, especially for sepiolite fiber, which can be observed by SEM. BET indicates that sepiolite fiber has a larger pore volume than others and this can be increased by calcination. IR shows that the adsorption of sepiolite to Cl-and SO42- belongs to physical absorption, instead of chemisorption.

关键词： adsorption chloridion sepiolite sulfate ion temperature

INTEGRATED APPROACH TO GENERATION OF PRECEDENCE RELATIONS AND PRECEDENCE GRAPHS FOR ASSEMBLY SEQUENCE PLANNING

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Chinese Journal of Mechanical Engineering 2002年第3期15卷 193-198页

作者： niu Xinwen Ding han Xiong YoulunSchool of Mechanical Science and Engineering, Huazhong University of Science and TechnologyWuhan 430074, China *** School of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China

An integrated approach to generation of precedence relations and precedencegraphs for assembly sequence planning is presented, which contains more assembly flexibility. Theapproach involves two stages. Based on the assembly model, the components in the assembly can bedivided into partially constrained components and completely con-strained components in the firststage, and then geometric precedence relation for every component is generated *** to the result of the first stage, the second stage determines and constructs allprecedence graphs. The algorithms of these two stages proposed are verified by two assemblyexamples.

关键词： Assembly sequence planning Assembly flexibility Precedence relations Precedence graphs

Current status and future prospects of stem cell therapy in Alzheimer’s disease

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Neural Regeneration Research 2020年第2期15卷 242-250页

作者： Fu-Qiang Zhang Jin-Lan Jiang Jing-Tian Zhang han niu Xue-Qi Fu Lin-Lin Zeng Scientific Research Centre of China-Japan Union Hospital Jilin UniversityChangchunJilin ProvinceChina School of Life Sciences Jilin UniversityChangchunJilin ProvinceChina

Alzheimer’s disease is a common progressive neurodegenerative disorder, pathologically characterized by the presence of β-amyloid plaques and neurofibrillary tangles. Current treatment approaches using drugs only alleviate the symptoms without curing the disease, which is a serious issue and influences the quality of life of the patients and their caregivers. In recent years, stem cell technology has provided new insights into the treatment of neurodegenerative diseases, including Alzheimer’s disease, Parkinson’s disease, and amyotrophic lateral sclerosis. Currently, the main sources of stem cells include neural stem cells, embryonic stem cells, mesenchymal stem cells, and induced pluripotent stem cells. In this review, we discuss the pathophysiology and general treatment of Alzheimer’s disease, and the current state of stem cell transplantation in the treatment of Alzheimer’s disease. We also assess future challenges in the clinical application and drug development of stem cell transplantation as a treatment for Alzheimer’s disease.

关键词： Alzheimer's disease β-amyloid drug development embryonic stem cells induced pluripotent stem cells mesenchymal stem cells nerve regeneration neural regeneration neural stem cells neurodegenerative disorders stem cell therapy

Optimization of Supercontinuum Sources for Ultra-Broadband T-CARS Spectroscopy

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Chinese Physics Letters 2011年第3期28卷 78-80页

作者： LIU Xing LIU Wei YIN Jun QU Jun-Le LIN Zi-Yang niu han-Ben Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Optoelectronic EngineeringShenzhen UniversityShenzhen 518060 College of Precision Instrument and Optoelectronics Engineering Tianjin UniversityTianjin 300072

For a typical photonic crystal fiber with two zero-dispersion wavelengths,we theoretically demonstrate a new way to generate supercontinuum using an input pulse of 30fs duration and lOkW peak power for providing a compact and cost effective light source to the ultra-broadband time-resolved coherent anti-Stokes Raman scattering spectroscopy.

关键词： spectroscopy continuum coherent

Comparative transcriptomic evidence of physiological changes and potential relationships in vertebrates under different dormancy states

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Zoological Research 2024年第2期45卷 341-354页

作者： Yu-han niu Li-Hong Guan Cheng Wang Hai-Feng Jiang Guo-Gang Li Lian-Dong Yang Shun-Ping He State Key Laboratory of Freshwater Ecology and Biotechnology Institute of HydrobiologyChinese Academy of SciencesWuhanHubei 430072China College of Life Sciences Qinghai Normal UniversityXiningQinghai 810008China Academy of Plateau Science and Sustainability Qinghai Normal UniversityXiningQinghai 810016China Key Laboratory of Biodiversity Formation Mechanism and Comprehensive Utilization of the Qinghai-Tibet Plateau in Qinghai Province Qinghai Normal UniversityXiningQinghai 810008China College of Life Sciences and Technology Xinxiang Medical UniversityXinxiangHenan 453003China College of Animal Science and Technology Northwest A&F UniversityYanglingShaanxi 712100China

Dormancy represents a fascinating adaptive strategy for organisms to survive in unforgiving *** a period of dormancy,organisms often exhibit exceptional *** period is typically divided into hibernation and aestivation based on seasonal ***,the mechanisms by which organisms adapt to their environments during dormancy,as well as the potential relationships between different states of dormancy,deserve further ***,we selected Perccottus glenii and Protopterus annectens as the primary subjects to study hibernation and aestivation,*** on histological and transcriptomic analysis of multiple organs,we discovered that dormancy involved a coordinated functional response across *** analyses revealed noteworthy disparities between the two dormant species in their responses to extreme ***,similarities in gene expression patterns pertaining to energy metabolism,neural activity,and biosynthesis were noted during hibernation,suggesting a potential correlation between hibernation and *** further explore the relationship between these two phenomena,we analyzed other dormancy-capable species using data from publicly available *** comparative analysis revealed that most orthologous genes involved in metabolism,cell proliferation,and neural function exhibited consistent expression patterns during dormancy,indicating that the observed similarity between hibernation and aestivation may be attributable to convergent *** conclusion,this study enhances our comprehension of the dormancy phenomenon and offers new insights into the molecular mechanisms underpinning vertebrate dormancy.

关键词： Hibernation Aestivation Multi-organs Convergent evolution

POLAR COORDINATES FOR THE GENERALIZED BAOUENDI-GRUSHIN OPERATOR AND APPLICATIONS

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Journal of Partial Differential Equations 2007年第4期20卷 322-336页

作者： Dou Jingbo niu Pengcheng han Junqiang Department of Applied Mathematics Northwestern Polytechnical University Xi'an 710072 China

In this parer, by using the polar coordinates for the generalized Baouendi- Grushin operatorLα=∑i=1^n 偏d^2/偏dxi^2＋∑j=1^m｜x｜^2α偏d^2/偏dy^2j,where x = （x1,x2,……,Xn）∈R^n,y = （y1,y2,… ,ym） ∈,α 〉 0, we obtain the volume of the ball associated to Lα and prove the nonexistence for a second order evolution inequality which is relative to Lα.

关键词： Generalized Baouendi-Grushin operator polar coordinate nonexistence second order evolution inequality.

SOD1^(G93A) Induces a Unique PSAP-Dependent Mitochondrial Apoptosis Pathway via Bax-Bak Interaction

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BIOCELL 2021年第4期45卷 963-970页

作者： han niu XIN CHEN XUEQI FU JINGTIAN ZhanG GUODONG LI YUXIANG WANG JIAYUE SONG XUETING MA CHEN HU XUEMIN XU FUQIANG ZhanG LINLIN ZENG Edmond H.Fischer Signal Transduction Laboratory College of Life SciencesJilin UniversityChangchun130012China Scientific Research Centre of China-Japan Union Hospital Jilin UniversityChangchun130033China Department of Biology College of Arts and SciencesUniversity of Texas of the Permian BasinOdessaTX 79762USA Department of General Surgery The Second Hospital of Jilin UniversityChangchun130041China School of Life Sciences and Technology Tongji UniversityShanghai200092China

Amyotrophic lateral syndrome(ALS)is a progressive degenerative disorder characterized by motor neuron death and axon *** dysfunction plays a key role in the pathogenesis of ALS,the mechanism of which remains poorly *** B-cell lymphoma-2(Bcl-2)family of proteins that control and mediate mitochondrial function and apoptosis,including the pro-apoptotic members Bcl2-Associated X(Bax),are involved in ALS *** death receptor 6(DR6)regulates motor neuron death in ALS,and DR6 antibodies can prevent axon degeneration and motor neuron damage by blocking *** studies demonstrated that PSAP localized to mitochondria and was required for DR6-induced *** this study,SOD1^(G93A) was transfected into the motor neuron cell line NSC-34 to serve as an ALS cell model in *** data assessed the role of PSAP in SOD1^(G93A)induced apoptosis and demonstrated that the overexpression of SOD1^(G93A),but not wtSOD1,induced PARP cleavage,caspase-3 activation,cytochrome c release,and Bax ***,Bax,and Bak were necessary for SOD1^(G93A)induced apoptosis,as silencing PSAP inhibited SOD1^(G93A)-mediated cell death that was dependent on Bax-Bak interaction.

关键词： ALS Bax Mitochondria PSAP SOD1^(G93A)

“问卷”发出之后——1990年代以来文学“问卷”中的青年写作问题

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扬子江文学评论 2024年第2期 52-58页

作者：牛菡中国矿业大学人文与艺术学院

创作谈即公开发表的,作家讲述个人创作动机、创作过程、创作内容、创作手法等的文本。问卷,也即“同题共答”,无疑是一种特殊类型的创作谈,它由一份问卷与多份答卷组成,具有作为“文本”与“行动”的双重意义,因此成为考察1990年代以来... 详细信息

创作谈即公开发表的,作家讲述个人创作动机、创作过程、创作内容、创作手法等的文本。问卷,也即“同题共答”,无疑是一种特殊类型的创作谈,它由一份问卷与多份答卷组成,具有作为“文本”与“行动”的双重意义,因此成为考察1990年代以来青年写作问题与症候的绝佳样本。学界对创作谈的研究,多集中在对其史料价值的发掘上,问卷作为特殊类型的创作谈,其“文本”外的“行动”意义相对被忽略,1990年代末的“断裂”问卷与同时期的《集体作业》、针对青年作家发起的绵延不断的问卷“调查”之间的精神关联,尚未被关注并阐明。

关键词：创作动机青年作家特殊类型创作谈史料价值精神关联问卷双重意义

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