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Rietveld refinement,microstructure,mechanical properties and oxidation characteristics of Fe-28Mn-xAl-1C(x=10 and 12 wt.%)low-density steels

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Journal of Iron and Steel Research International 2017年第12期24卷 1190-1198页

作者： Zhen-yi huang A-long Hou Yue-shan Jiang ping Wang Qi Shi Qing-yu Hou xiang-hua Liu School of Metallurgical Engineering Anhui University of TechnologyMa'anshan 243002AnhuiChina Key Laboratory of Metallurgical Emission Reduction&Resources Recycling Ministry of EducationAnhui University of TechnologyMaranshan 243002AnhuiChina Industrial&Commercial College Anhui University of TechnologyMa'anshan 243002AnhuiChina State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina

The quantitative relationship between microstructure and properties of austenitic Fe-28Mn-xAl-1C（x=10 and 12 wt.%）low-density steels was evaluated using Rietveld method to refine X-ray diffraction（XRD）*** results showed that a typical three-phase austenitic steel was obtained in the forged Mn28Al10（***-28Mn-10Al-1C）steel,which included about 92.85 wt.% γ-Fe（Mn,Al,C）（austenite）,5.28 wt.%（Fe,Mn）_3AlC_（0.5）（κ-carbide）,and 1.87 wt.% α-Fe（Al,Mn）（ferrite）.For the forged Mn28Al12（***-28Mn-12Al-1C）steel,nevertheless,only about 76.64 wt.% austenite,9.63 wt.%κ-carbide,9.14 wt.%ferrite and 4.59 wt.% Fe_3Al（DO_3）could be ***κ-carbide and DO_3 were mainly distributed in austenite grains and at the interface between austenite and ferrite,*** forged Mn28Al10 steel had a better combination of strength,ductility and specific strength as compared with the forged Mn28Al12 *** ductility of the forged Mn28Al12 steel was far lower than that of the forged Mn28Al10 *** oxidation kinetics of Mn28Al10 steel oxidized at 1323 Kfor 5-25 h had two-stage linear rate laws,and the oxidation rate of the second stage was faster than that of the first *** the oxidation kinetics of Mn28Al12 steel under this condition also had two-stage linear rate laws,the oxidation rate of the second stage was slower than that of the first *** the oxidation temperature increased to 1373K,the oxidation kinetics of the two steels at 5-25 hhad only onestage linear rate law,and the oxidation rates of the two steels were far faster than those at 1323K for5-25 *** oxidation resistance of Mn28Al12 steel was much better than that of Mn28Al10 *** layer formed between the austenite matrix and the oxidation layer of the two Fe-Mn-Al-C steels oxidized at high temperature.

关键词： Low-density steel Rietveld method Microstructure Mechanical property Oxidation characteristics

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Effect of Halogen Chain End Fidelity on the Synthesis of Poly(methyl methacrylate-b-styrene)by ATRP

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Chinese Journal of Polymer Science 2018年第11期36卷 1217-1224页

作者： Guang-Cheng huang Sheng-xiang Ji Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China University of Chinese Academy of Sciences Beijing 100049China

Poly（methyl methacrylate-b-styrene）（PMMA-b-PS） block copolymers are synthesized by two consecutive ATRPs and fractionated into four fractions. The halogen chain end fidelity （CEF） in PMMA-b-PS is quantified based on the analysis of each fraction. Compared to ethyl 2-phenyl-2-bromoacetate/CuBr/2,2＇-bipyridine （EPBA/CuBr/bpy） and CuBr/N,N,N＇,N＂,N＂-pentamethyldiethylene- triamine （CuBr/PMDETA） catalysts, PMMA-b-PS synthesized using p-toluenesulfonyl chloride/CuCl/bpy （TsC1/CuC1/bpy） and CuC1/PMDETA catalysts has a higher halogen CEF and a better control on molecular weight.

关键词： Atom transfer radical polymerization Chain end fidelity Block copolymer

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Evaluating the Formation Mechanisms of the Equatorial Pacific SST Warming Pattern in CMIP5 Models

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Advances in Atmospheric Sciences 2016年第4期33卷 433-441页

作者： Jun YING ping huang Ronghui huang Center for Monsoon System Research Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100190 University of Chinese Academy of Sciences Beijing 100049 Joint Center for Global Change Studies Beijing 100875

Based on the historical and RCP8.5 runs of the multi-model ensemble of 32 models participating in CMIP5, the present study evaluates the formation mechanisms for the patterns of changes in equatorial Pacific SST under global warming. Two features with complex formation processes, the zonal E1 Nifio-like pattern and the meridional equatorial peak warm- ing （EPW）, are investigated. The climatological evaporation is the main contributor to the E1 Nifio-like pattern, while the ocean dynamical thermostat effect plays a comparable negative role. The cloud-shortwave-radiation-SST feedback and the weakened Walker circulation play a small positive role in the E1 Nifio-like pattern. The processes associated with ocean dynamics are confined to the equator. The climatological evaporation is also the dominant contributor to the EPW pattern, as suggested in previous studies. However, the effects of some processes are inconsistent with previous studies. For example, changes in the zonal heat advection due to the weakened Walker circulation have a remarkable positive contribution to the EPW pattern, and changes in the shortwave radiation play a negative role in the EPW pattern.

关键词： global warming equatorial Pacific SST warming pattern multi-model ensemble CMIP5

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An upper(lower) bound for Max(Min) CSP

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Science China(Information Sciences) 2014年第7期57卷 129-137页

作者： huang ping YIN MingHao School of Electronics Engineering and Computer Science Peking University School of Computer Science and Information Technology Northeast Normal University

The random constraint satisfaction problem(CSP)instances generated by Model RB have been widely used in the field of CSP and have some nice *** this paper,we consider two optimization versions of CSP,i.e.,the maximum constraint satisfaction problem(Max-CSP)and the minimum satisfaction problem(Min-CSP)of Model *** problem of the Max-CSP is how to find an assignment to all the variables such that the maximum number of constraints are satisfied and the problem of Min-CSP is how to find an assignment to all the variables such that the minimum number of constraints are *** use the first moment method to prove that when r>2α(1/p-1)(or p>2α/(2α+r)),an upper bound of Max-CSP can be ***,we can prove that when r>2α(1/p-1)(or p>2α/(2α+r)),a lower bound of Min-CSP can be derived.

关键词： Max CSP Min CSP RB model upper bound lower bound

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Structural Insights into N^6-methyladenosine (m^6A) Modification in the Transcriptome

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Genomics, Proteomics & Bioinformatics 2018年第2期16卷 85-98页

作者： Jinbo huang ping Yin National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research Huazhong Agricultural University

More than 100 types of chemical modifications in RNA have been well documented. Recently, several modifications, such as N6-methyladenosine （m^6A）, have been detected in mRNA, opening the window into the realm of epitranscriptomies. The m^6A modification is the most abundant modification in mRNA and non-coding RNA （ncRNA）. At the molecular level, m^6A affects almost all aspects of mRNA metabolism, including splicing, translation, and stability, as well as microRNA （miRNA） maturation, playing essential roles in a range of cellular processes. The m^6A modification is regulated by three classes of proteins generally referred to as the ＂writer＂（adenosine methyltransferase）, ＂eraser＂（m^6A demethylating enzyme）, and ＂reader＂（m^6A-binding protein）. The m^6A modification is reversibly installed and removed by writers and erasers, respectively. Readers, which are members of the YT521-B homology （YTH） family proteins, selectively bind to RNA and affect its fate in an m^6A-dependent manner. In this review, we summarize the structures of the functional proteins that modulate the m^6A modification, and provide our insights into the m^6A-mediated gene regulation.

关键词： Epitranscriptomics M^6A modification Writer Reader Eraser

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Theory and contents of frictional mechanics

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Friction 2014年第1期2卷 27-39页

作者： ping huang Qianqian YANG School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou 510640China

In this paper,we first discuss the development of the field of tribology,and highlight some of the main problems encountered in this area,such as lack of systematicness,loose correlation,and inadequate focus on the microscopic ***,we provide basic formulas of frictional mechanics while considering the friction effect on classical mechanics *** order to carry out the frictional mechanics analysis,we first classify the *** to the size analysis of surface films,the manufacturing roughness of the surface,the contact width,and the roller radius of the rolling contact bearing,frictional mechanics has the features of interface mechanics,while interfaces are classified based on the presence or absence of a *** on the classification,we further analyze the pressure and frictional stress of sliding and rolling friction problems without a medium,such as a slider,wedge key,and V *** also analyze problems with a medium,such as journal and rolling contact *** comparing these results with those of classical mechanics without considering friction,we see that(1)friction causes deviations in the result for classical mechanics which does not consider friction,and(2)if the frictional stress and normal pressure affect each other,their interaction should be considered ***,we summarize the friction problems,namely,sliding and rolling,with and without a medium,and deformed and *** our analysis,we propose two ***,the frictional mechanics problem is a deviation of the classical mechanics problem,and secondly,frictional stress and normal pressure influence each other.

关键词： frictional mechanics interface normal pressure frictional stress

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Study on microscale adhesion between solid surfaces with scanning probe

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Science China(Technological Sciences) 2013年第12期56卷 2934-2952页

作者： LAI TianMao huang ping School of Mechanical and Automotive Engineering South China University of Technology

The adhesion between two parallel solid surfaces is of great interest with the rapid development of micro-nano devices and *** adhesion forces between a flat tip with a diameter^1.7μm and some surface have been determined by recording the force-displacement curves with an atomic force microscope(AFM).The flat tip is used to prevent wear and mimic the adhesion between two parallel *** free energy of the solid surface is calculated by the contact angles between the probe liquids and the *** adhesion force between parallel solid surfaces cannot be predicted by the theory of thermodynamic surface free *** adhesion measurements were carried out under ambient conditions,in a nitrogen-filled glove box,under distilled water,and under potassium chloride(KCl)*** outcome shows that the real contact area without the applied load is only a small proportion of the apparent contact *** measurement stability and repeatability of adhesion by the AFM depend on the surface characterization,measurement methods and the *** different environments,there are different interactions and factors affecting the adhesion force,and the dominant interactions and factors may be different *** various interactions and factors are mutually coupled to determine the final adhesion force.

关键词： micro-scale adhesion force atomic force microscope force-displacement curve flat tip surface free energy

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Vegetation Change of Ecotone in West of Northeast China Plain Using Time-series Remote Sensing Data

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Chinese Geographical Science 2010年第2期20卷 167-175页

作者： huang Fang WANG ping School of Urban and Environmental Sciences Northeast Normal University Changchun 130024 China

Multi-temporal series of satellite SPOT-VEGETATION normalized difference vegetation index (NDVI) and normalized difference water index (NDWI) data from 1998 to 2007 were used for analyzing vegetation change of the ecotone in the west of the Northeast China Plain. The yearly and monthly maximal values,anomalies and change rates of NDVI and NDWI were calculated to reveal the interannual and seasonal changes in vegetation cover and vegetation water content. Linear regression method was adopted to characterize the trends in vegetation change. The yearly maximal NDVI decreased from 0.41 in 1998 to 0.37 in 2007,implying the decreasing trend of vegetation activity. There was a significant decrease of maximal NDVI in spring and summer over the study period,while an increase trend was observed in autumn. The vegetation-improved regions and vegetation-degraded regions occupied 17.03% and 20.30% of the study area,respectively. The maximal NDWI over growing season dropped by 0.027 in 1998–2007,and about 15.15% of the study area showed a decreasing trend of water content. Vegetation water stress in autumn was better than that in spring. Vegetation cover and water content variations were sensitive to annual precipitation,autumn precipitation and summer temperature. The vegetation degradation trend in this ecotone might be induced by the warm-drying climate especially continuous spring and summer drought in the recent ten years.

关键词： vegetation change normalized difference vegetation index (NDVI) normalized difference water index (NDWI) SPOT-VEGETATION ecotone Northeast China Plain

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Reversing multidrug resistance by RNA interference through the suppression of MDR1 gene in human hepatoma cells

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World Journal of Gastroenterology 2006年第21期12卷 3332-3337页

作者： Xiao-ping Chen Qi Wang Jian Guan Zhi-Yong huang Wan-Guang Zhang Bi-xiang Zhang Department of Surgery and Hepatic Surgery Center Tongji Hospital of Tongji Medical CollegeHuazhong University of Science and Technology Wuhan 430030China

AIM： To reverse the multidrug resistance （MDR） by RNA interference （RNAi）-mediated MDRI suppression in heparoma ***： For reversing MDR by RNAi technology, two different short hairpin RNAs （shRNAs） were designed and constructed into pGenSil-1 plasmid, respectively. They were then transfected into a highly adriarnycin-resistant HepG2 hepatorna cell line （HepG2/ADM）. The RNAi effect on MDR was evaluated by real-time PCR, cell cytotoxicity assay and rhodarnine 123 （Rh123） efflux assy. RESULTS： The stably-transfected clones showed various degrees of reversal of MDR phenotype. Surprisingly, the MDR phenotype was completely reversed in two transfected clones. CONCLUSION： MDR can be reversed by the shRNAmediated MDRI suppression in HepG2/ADM cells, which provides a valuable clue to make multidrug-resistant hepatoma cells sensitive to anti-cancer drugs.

关键词： Multidrug resistance ShRNA MDR1 Hepatocellular carcinoma

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Scattering Law Analysis Based on Hapke and Lommel-Seeliger Models for Asteroidal Taxonomy

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Research in Astronomy and Astrophysics 2017年第10期17卷 83-90页

作者： xiang-Jie huang Xiao-ping Lu Jian-Yang Li Bao Mei Chih-Hao Hsia Hai-Bin Zhao Macao University of Science and Technology Lunar and Planetary Science Laboratory Macao University of Science and Technology - Partner Laboratory of Key Laboratory of Lunar and Deep Space Exploration Chinese Academy of Sciences Key Laboratory of Planetary Sciences Chinese Academy of Sciences Planetary Science Institute Purple Mountain Observatory Chinese Academy of Sciences

In deriving the physical properties of asteroids from their photometric data, the scattering law plays an important role, although the shape variations of asteroids result in the main variations in lightcurves. By following the physical behaviors of light reflections, Hapke et al. deduced complex functions to represent the scattering process, however, it is very hard to accurately simulate the surface scattering law in reality. For simplicity, other numerical scattering models are presented for efficiently calculating the physical properties of asteroids, such as the Lommel-Seeliger （LS） model. In this article, these two models are compared numerically. It is found that in some numerical applications the LS model in simple form with four parameters can be exploited to replace the Hapke model in complex form with five parameters. Furthermore, the generated synthetic lightcurves by the Cellinoid shape model also show that the LS model can perform as well as the Hapke model in the inversion process. Finally, by applying the Principal Component Analysis （PCA） technique to the parameters of the LS model, we present an efficient method to classify C and S type asteroids, instead of the conventional method using the parameters of the Hapke model.

关键词： scattering -- techniques: photometric -- minor planets -- asteroids: general

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