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秀丽隐杆线虫在食品营养功能评价中的研究进展

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食品与机械 2024年第1期40卷 197-203页

作者：陈旺何海伦郑艳君易翠平长沙理工大学食品与生物工程学院湖南长沙410114 中南大学生命科学学院湖南长沙410083 湖南女子学院社会发展管理学院湖南长沙410004

秀丽隐杆线虫作为一种理想的模式生物,已被越来越多地应用于食品营养功能的评价。与细胞、小鼠等其他模型比较,线虫具有体积小、寿命短、与人类基因同源性高、研究结果易于观察且能够在实验室大批量培养等优点。文章综述了秀丽隐杆线虫... 详细信息

秀丽隐杆线虫作为一种理想的模式生物,已被越来越多地应用于食品营养功能的评价。与细胞、小鼠等其他模型比较,线虫具有体积小、寿命短、与人类基因同源性高、研究结果易于观察且能够在实验室大批量培养等优点。文章综述了秀丽隐杆线虫在抗肥胖、抗氧化、抗衰老的食品营养功能评价中的研究方法、潜在机理及研究进展,并展望了秀丽隐杆线虫在食品抗肥胖、抗氧化、抗衰老中的研究前景。

关键词：秀丽隐杆线虫抗肥胖抗氧化抗衰老营养功能

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内锥型空心弹关键参数与阻力特性仿真研究

兵器装备工程学报 2024年第5期45卷 52-57页

作者：郑艳军钟建华李昌坤杨慧西南技术工程研究所重庆400039

为了揭示内锥型空心弹关键参数与阻力特性之间的关系,基于30 mm口径内锥型空心弹模型,通过改变锲角和喉径比关键参数,利用计算流体动力学软件Fluent对空心弹在不同马赫数下进行数值仿真,得到了不同参数下的阻力特性。结果表明:在喉径比... 详细信息

为了揭示内锥型空心弹关键参数与阻力特性之间的关系,基于30 mm口径内锥型空心弹模型,通过改变锲角和喉径比关键参数,利用计算流体动力学软件Fluent对空心弹在不同马赫数下进行数值仿真,得到了不同参数下的阻力特性。结果表明:在喉径比为0.2时,空心弹会发生阻塞现象,单独增加马赫数不能消除阻塞;消除阻塞前,在同一马赫数条件下,随着喉径比不断增加,阻力系数数值逐渐减小,尤其在阻塞临界点附近,阻力系数数值会出现骤降;消除阻塞后,随着喉径比不断增加,阻力系数数值变化不明显;消除阻塞现象所需马赫数随喉径比增加逐渐减小,喉径比越大越易于消除阻塞问题。锲角的大小对阻力特性影响较大,锲角越大,越易于造成阻塞现象;在喉径比和马赫数相同条件下,锲角越大阻力系数数值越大。在锲角和喉径比相同时,马赫数越大阻力系数值反而越小。在空心弹及类似弹丸设计时,需同时兼顾锲角、喉径比和马赫数对气动特性的影响。

关键词：内锥型空心弹阻力系数仿真阻塞锲角喉径比

Effects of Predeformation on the Reverse Martensitic Transformation of TiNi Shape Memory Alloy

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Journal of Materials Science & Technology 2000年第6期16卷 611-614页

作者： yanjun zheng Lishan CUI Fan ZHANG Dazhi YANG Department of Materials Science and Engineering University of Petroleum Beijing 102200 China Department of Materials Engineering Dalian University of Technology Dalian 116024 China

DSC was used to study the effects of predeformation on the reverse martensitic transformation of near-equiatomic TiNi alloy. Both the start temperature As and the finish temperature Af of the reverse transformation increased with increasing degree of predeformation, but the algebraic difference between As and Af decreased with increasing predeformation until it reached a minimum value, then remained unchanged with further deformation. Transformation heat also increased with increasing predeformation until it reached a maximum value, then decreased with further predeformation. All the phenomena above were considered to be closely related with the release of elastic strain energy during predeformation.

关键词： TiNi Effects of Predeformation on the Reverse Martensitic Transformation of TiNi Shape Memory Alloy

Effects of Severe Plastic Deformation and Heat Treatment on Transformation Behavior of Explosively Welded Duplex TiNi-TiNi

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Petroleum Science 2007年第4期4卷 107-112页

作者： Li Juntao zheng yanjun Cui Lishan Department of Materials Science and Engineering China University of Petroleum Beijing 102249 China

The effects of severe plastic deformation and heat treatment on the transformation behavior of explosively welded duplex TiNi-TiNi shape memory alloys （SMAs） were investigated by differential scanning calorimeter （DSC） measurements. The explosively welded duplex TiNi-TiNi plate of 0.7 mm thickness was cold-rolled at room temperature to a 60% reduction in thickness and then annealed at different temperatures for different durations. The results showed that low temperature （623-723K） heat-treatment led to the crystallization of the amorphous region, and re-crystallization occurred in the specimens annealed at higher temperatures （over 873 K）. Research indicated that the change of martensitic transformation temperature is due to the change of internal stresses with increasing heat treatment temperature. The change of annealing time also led to a change in martensitic transformation temperature, which was associated with the precipitation and decomposition of Ti3Ni4 in TiNi-1.

关键词： TiNi explosive welding cold rolling martensitic transformation differential scanning calorimeter

Influence of Pseudoelasticity on Mechanical Behavior of TiNi Alloy under Dynamic Impact Loading

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Petroleum Science 2007年第1期4卷 86-89页

作者： Xu Renbo Cui Lishan zheng yanjun Chen Hongling Department of Materials Science and Engineering China University of Petroleum Beijing 102249 China

The mechanical behavior of TiNi alloy and Cr12MoV alloy under dynamic impact loading was investigated with a self-made impact testing system. The real-time contact force was measured with a piezoelectric force sensor and digital signal processing system during impact. Equations for predicting instantaneous velocity anti displacement were presented. The results showed that the TiNi alloy exhibited a plateau of maximum contact force with increasing impact height. At the plateau stage, TiNi alloy in the parent phase can absorb impact energy and keep the maximum contact force nearly identical due to its pseudoelasticity.

关键词： TiNi alloy mechanical behavior contact force impact energy pseudoelasticity

Expression profile of circular RNAs in myocardial ischemia/reperfusion with and without intermittent hypobaric hypoxia preconditioning

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Science China(Life Sciences) 2019年第8期62卷 1104-1106页

作者： Jiliang Tan Shanshan Gu yanjun zheng Huangtian Yang CAS Key Laboratory of Tissue Microenvironment and Tumor Laboratory of Molecular CardiologyShanghai Institute of Nutrition and HealthShanghai Institutes for Biological SciencesChinese Academy of SciencesShanghai200031China Institute for Stem Cell and Regeneration Chinese Academy of SciencesBeijing100101China

Dear Editor,Myocardial injury following ischemia/reperfusion(I/R)is a common clinical scenario in patients suffering from ischemic heart disease(Hausenloy et al.,2016).The involvement of proteins and signaling pathways is well studied in myocardial I/R injury and protection(Hausenloy et al.,2016;Yang et al.,2012),however,more than 98%of the transcriptional output in mammals are noncoding RNAs(ncRNAs).These products range from short microRNAs(miRNAs)to long noncoding RNAs(lncRNAs,Das et al.,2018)and modulate critical pathophysiologic mechanisms,such as apoptosis,oxidative stress,Ca2+overload and inflammation,during myocardial I/R injury and protection(Das et al.,2018).

关键词： circRNA Expression profile of circular RNAs in myocardial ischemia/reperfusion with and without intermittent hypobaric hypoxia preconditioning profile

Properties of oxide films grown on 25Cr20Ni alloy in air-H_2O and H_2-H_2O atmospheres

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Petroleum Science 2014年第1期11卷 147-154页

作者： Wang Shenxiang Cui Lishan Wang Guoqing zheng yanjun Wang Hongxia Jia Jingsheng College of Science China University of Petroleum Beijing Research Institute of Chemical Industry

The oxidation kinetics,surface morphology and phase structure of oxide films grown on 25Cr20Ni alloy in air-H2O and H2-H2O atmospheres at 900 ℃ for 20 h were *** anti-coking performance and resistance to carburization of the two oxide films were compared using 25Cr20Ni alloy tubes with an inner diameter of 10 mm and a length of 850 mm in a bench scale naphtha steam pyrolysis *** oxidation kinetics followed a parabolic law in an air-H2O atmosphere and a logarithm law in a H2-H2O atmosphere in the steady-state *** oxide film grown in the air-H2O atmosphere had cracks where the elements Fe and Ni were enriched and the un-cracked area was covered with octahedral-shaped MnCr2O4 spinels and Cr1.3Fe0.7O3 oxide clusters,while the oxide film grown in the H2-H2O atmosphere was intact and completely covered with dense standing blade MnCr2O4 *** the pyrolysis tests,the anti-coking performance and resistance to carburization of the oxide film grown in the H2-H2O atmosphere were far better than that in the air-H2O *** mass of coke formed in the oxide film grown in the H2-H2O atmosphere was less than 10％ of that in the air-H2O *** Cr1.3Fe0.7O3 oxide clusters converted into Cr23C6 carbides and the cracks were filled with carbon in the oxide film grown in the air-H2O atmosphere after repeated coking and decoking tests,while the dense standing blade MnCr2O4 spinels remained unchanged in the oxide film grown in the H2-H2O *** ethylene,propylene and butadiene yields in the pyrolysis tests were almost the same for the two oxide films.

关键词： 25Cr20Ni alloy air-H2O H2-H2O oxide film anti-coking resistance to carburization

The Synthesis of TiNi and Composite Particles in Molten Salts

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Petroleum Science 2005年第3期2卷 37-39页

作者： Yang Ruisong Cui Lishan zheng yanjun Department of Materials Science and Engineering China University of Petroleum ChinaBeijing 102249

A novel process for synthesizing TiNi and TiNi/TiC particles, called the high-temperature salt-melting method, is discussed in this paper. So far as this method is concerned, the molten salts are a reaction medium that does not take part in the chemical reaction but can be easily dissolved by water washing. With this method, TiNi shape memory alloy and TiNi/TiC composite particles were prepared in molten salts at 680-850℃. TiNi particles, ranging from 100 nm to several microns in diameter, are obtained and the reverse martensitic transformation is confirmed in these particles by the differential scanning calorimetry （DSC）. The reaction temperature and the holding time have no significant influence on the particle size, morphology or the reverse martensitic transformation characteristics. In the molten salts, the released heat of the chemical reaction causes the local temperature to rise quickly, which is the key to obtaining the desired particulate composite.

关键词： TiC particles TiNi particles molten salts martensitic transformation

Photothermal scaffolds/surfaces for regulation of cell behaviors

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Bioactive Materials 2022年第2期7卷 449-477页

作者： Yangcui Qu Kunyan Lu yanjun zheng Chaobo Huang Guannan Wang Yanxia Zhang Qian Yu College of Biomedical Engineering&the Key Laboratory for Medical Functional Nanomaterials Jining Medical UniversityJining272067PR China Joint Laboratory of Advanced Biomedical Materials(NFU-UGent) College of Chemical EngineeringNanjing Forestry UniversityNanjing210037PR China Department of Cardiovascular Surgery of the First Affiliated Hospital&Institute for Cardiovascular Science Soochow UniversitySuzhou215006PR China State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials College of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou215123PR China

Regulation of cell behaviors and even cell fates is of great significance in diverse biomedical applications such as cancer treatment,cell-based therapy,and tissue *** the past decades,diverse methods have been developed to regulate cell behaviors such as applying external stimuli,delivering exogenous molecules into cell interior and changing the physicochemical properties of the substrates where cells *** scaffolds/surfaces refer to a kind of materials embedded or coated with photothermal agents that can absorb light with proper wavelength(usually in near infrared region)and convert light energy to heat;the generated heat shows great potential for regulation of cell behaviors in different *** the current review,we summarize the recent research progress,especially over the past decade,of using photothermal scaffolds/surfaces to regulate cell behaviors,which could be further categorized into three types:(i)killing the tumor cells via hyperthermia or thermal ablation,(ii)engineering cells by intracellular delivery of exogenous molecules via photothermal poration of cell membranes,and(iii)releasing a single cell or an intact cell sheet via modulation of surface physicochemical properties in response to *** the end,challenges and perspectives in these areas are commented.

关键词： Photothermal scaffolds Photothermal surfaces Tumor ablation Intracellular delivery Cell detachment