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crystallization study of cu_(56)Zr_7Ti_(37) Metallic Glass by Electrical Resistivity Measurement

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Journal of Materials science & Technology 2011年第3期27卷 275-279页

作者： Ansu J.Kailath Kalpalata Dutta Thomas c. alex Amitava Mitra National Metallurgical Laboratory

In this paper, the crystallization behaviour of amorphous cu56Zr7Ti37 alloy using thermal electrical resistivity （TER） and differential scanning calorimetry （Dsc） studies has been described. Isochronal TER and Dsc measurements indicate that crystallization occurs in two stages. Isothermal crystallization studies of the alloy by TER show that the kinetics conforms to Johnson-Mehl-Avrami model. Avrami exponents derived from kinetics, between 1.1 and 1.2, imply that the crystallization processes are diffusion controlled with near zero nucleation. Activation energy has been found to increase with the transformed volume fraction. A plausible explanation has been presented by separating the contributions due to nucleation and crystal growth towards total activation energy.

关键词： Metallic glass crystallization Electrical resistivity Avrami exponent Activation energy

catalytically active interfaces in titania nanorod-supported copper catalysts for cO oxidation

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Nano Research 2020年第2期13卷 533-542页

作者： Wasim U.Khan season s.chen Daniel c.W.Tsang Wey Yang Teoh Xijun Hu Frank L.Y.Lam alex c.K.Yip Department of chemical and Process Engineering The University of canterbury Christchurch 8041New Zealand Department of civil and Environmental Engineering.The Hong Kong Polytechnic University Hong Kong.China school of chemical Engineering The University of New South WalesSydneyNSW 2052Australia Department of chemical and Biological Engineering The Hong Kong University of Science and TechnologyHong KongChina

One-dimensional titanium dioxide nanorod(TNR)-supported cu catalysts(2.5 wt.%-12.5 wt.%)were synthesized using deposition-precipitation.X-ray photoelectron spectroscopy,temperature programmed reduction and cO chemisorption measurements showed that cu doping over TNR offered metal-support interactions and interfacial active sites that had a profound impact on the catalytic *** role of the cu-TNR interface was investigated by comparing the catalytic activity of cu-TNR catalysts with that of pure cuO nanoparticles in cO *** presence of highly dispersed copper species,a high number of interfacial active sites,cO adsorption capacity and surface/lattice oxygen were found to be responsible for the excellent activity of 7.5cU-TNR(ie,cu loading of 7.5 wt.%on TNR).Moreover,the cu-TNR catalysts followed the Langmuir-Hinshelwood reaction mechanism with 7.5cU-TNR,exhibiting an apparent activation energy of 44.7 kJ/*** TNR-supported cu catalyst gave the highest interfacial catalytic activity in medium-temperature cO oxidation(120-240℃)compared to other commonly used supports,including titanium dioxide nanoparticles(TiO2-P25),silica(siO2)and alumina(Al20g)in which copper species were nonhomogeneously *** study confirms that medium-temperature cO oxidation is highly sensitive to the morphology and structure of the supporting material.

关键词： supported catalysts nanorod oxygen species interfacial active sites cO oxidation

A more general form of lump solution,lumpoff,and instanton/rogue wave solutions of a reduced (3+1)-dimensional nonlinear evolution equation

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chinese Physics B 2018年第12期27卷 147-156页

作者： Panfeng Zheng man Jia Physics Department Ningbo UniversityNingbo 315211China Ningbo collaborative Innovation center of Nonlinear Hazard system of Ocean and Atmosphere Ningbo UniveisityNingbo 315211China

In this manuscript,a reduced(3+1)-dimensional nonlinear evolution equation is *** first construct the bilinear formalism of the equation by using the binary Bell polynomials theory,then explore a lump solution to the special case for z=***,a more general form of lump solution of the equation is found which possesses seven arbitrary parameters and four constraint *** cutting the lump by the induced soliton(s),lumpoff and instanton/rogue wave solutions are also constructed by the more general form of lump solution.

关键词： a reduced(3 + 1)-dimensional nonlinear evolution equation more general form of lump solution soliton induced by lump lumpoff and instanton/rogue wave solutions

Depleted uranium oxide supported nickel catalyst for autothermal cO_(2)methanation in non-adiabatic reactor under induction heating

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Journal of Energy chemistry 2023年第10期85卷 310-323,I0010页

作者： Lai Truong-Phuoc Jean-Mario Nhut Loïc Vidal cuong Duong-Viet sécou sall corinne Petit christophe sutter Mehdi Arab alex Jourdan cuong Pham-Huu Institute of chemistry and Processes for Energy Environment and Health(ICPEES)ECPMUMR 7515 CNRS-University of Strasbourg25 rue Becquerel67087 Strasbourg Cedex 02France BlackLeaf sAs 210 rue Geiler de Kaysersberg67400 IllkirchFrance Institute of Materials science of Mulhouse IS2MUMR 7361Universitéde Haute-AlsaceCNRS15rue Jean Starcky-BP 248868057 MulhouseFrance ORANO Tricastin Direction de La Recherche&DéveloppementSite du TRICASTIN BP 1626701 Pierrelatte CedexFrance

Undoped nickel-based catalysts supported on depleted uranium oxide allow one to carry out cO_(2)methanation process under extremely low reaction temperature under atmospheric pressure and powered by a contactless induction *** adjusting the reaction conditions,the catalyst is able to perform cO_(2)methanation reaction under autothermal process operated inside a non-adiabatic reactor,without any external energy *** autothermal process is possible thanks to the high apparent density of the UO_x which allows one to confine the reaction heat in a small catalyst volume in order to confine the exothermicity of the reaction inside the catalyst and to operate the reaction at equilibrium heat in-heat *** autothermal operation mode allows one to significantly reduce the complexity of the process compared to that operated using adiabatic reactor,where complete insulation is required to prevent heat disequilibrium,in order to reduce as much as possible,the heat exchange with the external *** catalyst displays an extremely high stability as a function of time on stream as no apparent *** is expected that such new catalyst with unprecedented catalytic performance could open new era in the field of heterogeneous catalysis where traditional supports show their limitations to operate catalytic processes under severe reaction conditions.

关键词： cO_(2)methanation Auto-methanation Induction heating Depleted uranium oxide Electrification process Operando DRIFTs

Morphology and strain control of hierarchical cobalt oxide nanowire electrocatalysts via solvent effect

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Nano Research 2020年第11期13卷 3130-3136页

作者： Xiuming Bu Xiongyi Liang Kingsley O.Egbo Zebiao Li You Meng Quan Quan Yang Yang Li Kin man Yu chi-man Lawrence Wu Johnny c.Ho Department of Materials science and Engineering City University of Hong KongKowloonHong Kong SARChina Department of Physics City University of Hong KongKowloonHong KongKowloonHong Kong SARChina state Key Laboratory of Terahertz and Millimeter Waves City University of Hong KongKowloonHong Kong SARChina

Designing highly efficient and low-cost electrocatalysts for oxygen evolution reaction is important for many renewable energy *** particular,strain engineering has been demonstrated as a powerful strategy to enhance the electrochemical performance of catalysts;however,the required complex catalyst preparation process restricts the implementation of strain ***,we report a simple self-template method to prepare hierarchical porous co_(3)O_(4)nanowires(PNWs)with tunable compressive strain via thermal-oxidation-transformation of easily prepared oxalic acid-cobalt nitrate(co(NO_(3))_(2))composite *** on the complementary theoretical and experimental studies,the selection of proper solvents in the catalyst preparation is not only vital for the hierarchical structural evolution of co_(3)O_(4) but also for regulating their compressive surface *** of the rich surface active sites and optimized electronic co d band centers,the PNWs exhibit the excellent activity and stability for oxygen evolution reaction,delivering a low overpotential of 319 mV at 10 mA·cm^(−2)in 1 M KOH with a mass loading 0.553 mg·cm^(−2),which is even better than the noble metal catalyst of RuO_(2).This work provides a cost-effective example of porous co_(3)O_(4)nanowire preparation as well as a promising method for modification of surface strain for the enhanced electrochemical performance.

关键词： hierarchical structure morphology control compressive strain solvent effect oxygen evolution reaction

Regional-scale surface Air Temperature and East Asian summer Monsoon changes during the Last Millennium simulated by the FGOALs-gl climate system Model

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Advances in Atmospheric sciences 2014年第4期31卷 765-778页

作者： man Wenmin ZHOU Tianjun state Key Laboratory of Numerical Modeling for Atmospheric sciences and Geophysical Fluid Dynamics Institute of Atmospheric Physics Chinese Academy of Sciences Key Laboratory of Meteorological Disaster of Ministry of Education Nanjing University of Information Science and Technology climate change Research center Chinese Academy of Sciences

The spatial patterns and regional-scale surface air temperature （sAT） changes during the last millennium,as well as the variability of the East Asian summer monsoon （EAsM） were simulated with a low-resolution version of Flexible Global Ocean-Atmosphere-Land-sea-ice （FGOALs-gl） *** model was driven by both natural and anthropogenic forcing *** features of the simulated past millennial Northern Hemisphere （NH） mean sAT variations,including the Medieval climate Anomaly （McA）,the Little Ice Age （LIA） and the 20th century Warming （20cW）,were generally consistent with the *** simulated McA showed a global cooling pattern with reference to the 1961-90 mean conditions,indicating the 20cW to be unprecedented over the last millennium in the *** LIA was characterized by pronounced coldness over the continental extratropical NH in both the reconstruction and the *** simulated global mean sAT difference between the McA and LIA was 0.14°c,with enhanced warming over high-latitude NH continental *** between the simulation and the reconstruction on regional scales were lower than those on hemispheric *** major features agreed well between the simulated and reconstructed sAT variations over the chinese domain,despite some inconsistency in details among different *** EAsM circulation during the McA was stronger than that during the LIA The corresponding rainfall anomalies exhibited excessive rainfall in the north but deficient rainfall in the *** the zonal and meridional thermal contrast were enhanced during the *** temperature anomaly pattern favored a stronger monsoon circulation.

关键词： last millennium surface air temperature spatial patterns regional-scale variation East Asian summer monsoon

Responses of soil nitrogen, phosphorous and organic matter to vegetation succession on the Loess Plateau of china

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Journal of Arid Land 2015年第2期7卷 216-223页

作者： man cHENG shao shan AN college of Natural Resources and Environment Northwest A&F University state Key Laboratory of soil Erosion and Dryland Farming on the Loess Plateau Northwest A&F University

Revegetation is a traditional practice widely used for soil protection. We evaluated the effect of natural revegetation succession on soil chemical properties and carbon fractions （particulate organic carbon （POc）, humus carbon （Hs-c）, humic acid carbon （HA-c） and fulvic acid carbon （FA-c）） on the Loess Plateau of china. The vegetation types, in order from the shortest to the longest enclosure duration, were：（a） abandoned overgrazed grassland （AbG3; 3 years）; （b） Hierochloe odorata Beauv. （HiO7; 7 years）; （c） Thymus mongoficus Ronnm （ThM15; 15 years）; （d） Artemisia sacrorum Ledeb （Ats25; 25 years）; （e） stipa bungeana Trin Ledeb （stB36; 36 years） and （f） stipa grandis P. smirn （stG56; 56 years）. The results showed that the concentrations of soil organic carbon, total nitrogen and available phosphorus increased with the increase of restoration time except for ThM15. The concen- tration of NH4-N increased in the medium stage （for ThM15 and Ats25） and decreased in the later stage （for stB36 and stG56） of vegetation restoration. However, NO3-N concentration significantly increased in the later stage （for stB36 and stG56）. carbon fractions had a similar increasing trend during natural vegetation restoration. The con- centrations of POc, Hs-c, FA-c and HA-c accounted for 24.5%-49.1%, 10.6%-15.2%, 5.8%-9.1% and 4.6%-6.1% of total carbon, respectively. For AbG3, the relative changes of POc, Hs-c and FA-c were significantly higher than that of total carbon during the process of revegetation restoration. The higher relative increases in POc, Hs-c and FA-c confirmed that soil carbon induced by vegetation restoration was sequestrated by higher physical and chemical protection. The increases of soil c fractions could also result in higher ecological function in semiarid grassland ecosystems.

关键词： particulate organic carbon humus carbon humic acid carbon fulvic acid carbon carbon fraction natural vegetation succession

Effect of age and different doses of dietary vitamin E on breast meat qualitative characteristics of finishing broilers

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Animal Nutrition 2021年第1期7卷 163-167页

作者： Vivian Vieira Francielle O.Marx Lucas s.Bassi Marley c.santos alexandre Oba simone Gisele de Oliveira alex Maiorka Federal University of Paraná Curitiba80035-050Brazil state University of Londrina Londrina86055-900Brazil

The supplementation of vitamin E on broiler chicken diets is essential to the prevention of lipid oxidation reactions in the meat and improvement of meat *** objective of this study was to assess the effect of different doses of dietary vitamin E on breast meat quality of broiler chickens in the finishing *** doses of vitamin E were used(30,90,150,210,and 270 mg/kg feed)in broilers'diets from 42 to 54 d of age.A completely randomized design was conducted,followed by a split-plot,where the vitamin E dose was considered as the whole plot,and broilers'age at slaughter was the *** meat quality was assessed at 4 different ages(45,48,51,and 54 d old),using 50 birds per age,totaling 200 *** quality characteristics evaluated were:pH at 24 h post mortem,color(brightness,redness,and yellowness),water holding capacity,cooking loss,shear force,and lipid *** was no interaction between age and dose of vitamin E for meat quality characteristics(P>0.05).The age at slaughter had a quadratic effect(Pss,redness,and water holding *** pH values were higher in the breast meat of older birds(51 and 52 d old),breast meat of younger birds(48 d)had a more reddish *** force value was higher in breast meat of birds slaughtered at later ages(Ps a linear age-effect was *** increased linearly(Pses,whereas treatments did not alter yellowness,cooking loss,and lipid *** this study,increasing vitamin E doses in the finishing period increased the brightness of broiler breast meat,whereas slaughtering at later ages resulted in greater meat pH and shear force value.

关键词： Alpha-tocopherol Broiler chicken Meat quality Oxidation Vitamin

Beneficial mechanisms of aerobic exercise on hepatic lipid metabolism in non-alcoholic fatty liver disease

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Hepatobiliary & Pancreatic Diseases International 2015年第2期14卷 139-144页

作者： Rui Guo Emily c Liong Kwok Fai so man-Lung Fung George L Tipoe Departments of Anatomy Li Ka shing Faculty of Medicine The University of Hong Kong Physiology Li Ka Shing Faculty of MedicineThe University of Hong Kong

BAcKGROUND：Non-alcoholic fatty liver disease（NAFLD）refers to any fatty liver disease that is not due to excessive use of *** probably results from abnormal hepatic lipid metabolism and insulin *** exercise is shown to improve *** review aimed to evaluate the molecular mechanisms involved in the beneficial effects of aerobic exercise on *** sOURcE：We searched articles in English on the role of aerobic exercise in NAFLD therapy in Pub ***： The mechanisms of chronic aerobic exercise in regulating the outcome of NAFLD include：（i） reducing in- trahepatic fat content by down-regulating sterol regulatory element-binding protein-lc and up-regulating peroxisome proliferator-activated receptor y expression levels; （ii） decreas- ing hepatic oxidative stress through modulating the reactive oxygen species, and enhancing antioxidant enzymes such as catalase and glutathione peroxidase; （iii） ameliorating hepatic inflammation via the inhibition of pro-inflammatory media- tors such as tumor necrosis factor-alpha and interleukin-1 beta; （iv） attenuating mitochondrial dependent apoptosis by reducing cytochrome c released from the mitochondria to the cytosol; and （v） inducing hepato-protective autophagy. cONcLUsION： Aerobic exercise, via different mechanisms, significantly decreases the fat content of the liver and improves the outcomes of patients with NAFLD.

关键词： non-alcoholic fatty liver disease chronic aerobic exercise oxidative stress inflammation apoptosis autophagy