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Nanoscale strain engineering of graphene and graphene-based devices

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Acta Mechanica Sinica 2016年第3期32卷 497-509页

作者： N.-c.Yeh c.-c.Hsu M.L.Teague J.-Q.Wang D.A.Boyd c.-c.chen Department of Physics Institute for Quantum Information and Matter and Kavli Nanoscience InstituteCalifornia Institute of Technology Department of Physics Fudan University Department of Physics California Institute of Technology

Structural distortions in nano-materials can induce dramatic changes in their electronic properties. This situation is well manifested in graphene, a two-dimensional honeycomb structure of carbon atoms with only one atomic layer thickness. In particular, strained graphene can result in both charging effects and pseudo-magnetic fields, so that controlled strain on a perfect graphene lattice can be tailored to yield desirable electronic properties. Here, we describe the theoretical foundation for strain-engineering of the electronic properties of graphene, and then provide experimental evidence for strain-induced pseudo-magnetic fields and charging effects in monolayer graphene. We further demonstrate the feasibility of nano-scale strain engineering for graphene-based devices by means of theoretical simulations and nano-fabrication technology.

关键词： Graphene Strain-engineering Nanostructures Dirac fermions Pseudo-magnetic field Valleytronics

etUDE THEORIQUE,DES EFFetS cOMBINES DE LA cONVEcTION NATURELLE et FORcEE,AU-DESSUS D'UNE SURFAcE PLANE INcLINEE SOUMISE A UN FLUX DE RAYONNEMENT

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chinese Science Bulletin 1983年第5期28卷 701-706页

作者：郭廷玮 RAcHMAT BAcHRUN et MIcHEL DAGUENet Institut de production d'électricité de l'Académie des Sciences de chine PEKIN CHINE. Institut de Technologie de Banduug BANDUNG-JAVA INDONESIE. Laboratoire de Thermodynamique et Energétique Université de Perpignan Perpignan Cedex France? INTRODUCTION Dans un précédent travail nous avons analysé l'influence de la convection naturelle sur la convection forcée au-dessus d'une surface plane verticale soumise à un flux de rayonnement.

Ⅰ. INTRODUcTION Dans un précédent travail nous avons analysé l’influence de la convection naturelle sur la convection forcée au-dessus d’une surface plane verticale soumise à un flux de rayonnement.

关键词： SURFAcE convection Petit Plaque quant masse 日卜 param divergent varia

Eltrombopag in chronic hepatitis c

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World Journal of Gastroenterology 2014年第35期20卷 12517-12521页

作者： Romeo-Gabriel Mih?il? Remus-c?lin cip?ian Faculty of Medicine "Lucian Blaga" University of Sibiu

chronic hepatitis c is a public health problem ***,not all patients may benefit from antiviral therapy due to *** causes are represented by portal hypertension and platelet sequestration in the spleen,decreased serum levels or activity of thrombopoietin,the bone marrow suppression induced by hepatitis c virus and a possible adverse effect of *** receptor analogs may contribute to increase platelet counts in these *** binds to another region of the thrombopoietin receptor compared to endogenous thrombopoietin and stimulates the proliferation and maturation of megakaryocytes and the platelet production in a dose-dependent *** has proven its effectiveness for the treatment of patients with primary immune *** indication for other hemopathies or situations(like thrombocytopenia secondary to chemo- or radiotherapy,acute leukemia,myelodysplastic syndroms,acquired and hereditary bone marrow failure,and platelet donors) is under *** may be particularly useful in patients with advanced chronic hepatitis or liver cirrhosis who require antiviral *** present a minireview on the results of treatment with eltrombopag in patients chronically infected with hepatitis c virus,highlighting the benefits and mentioning possible adverse *** some studies eltrombopag increased the number of virological responses after clasical antiviral treatment of patients with chronic hepatitis c and reduced the transfusional requirements of those who had to be subjected to invasive *** is a solution for many of these patients,which allows them receiving antiviral therapy and sometimes getting a sustained virological response,but they must be well monitored to prevent possible thromboembolic or bone marrow complications or liver failure occurrence.

关键词： Eltrombopag chronic hepatitis c Hepatitis c virus Platelets Thrombocytopenia

Mass spectra and Regge trajectories of Λ_c^+,∑_c^0,Ξ_c^0 and Ω_c^0 baryons

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chinese Physics c 2016年第12期40卷 10-21页

作者： Zalak Shah Kaushal Thakkar Ajay Kumar Rai P. c. Vinodkumar Department of Applied Physics Sardar Vallabhbhai National Institute of Technology Surat Gujarat 395007 India Department of Applied Sciences &: Humanities GIDC Degree Engineering college Abrama Navsari 396406 India Department of physics Sardar Patel University V.V. Nagar Anand 388120 India

We calculate the mass spectra of the singly charmed baryons （∧＋ c, ∑0 c,[I]0c and Ω0 c） using the hypercentral constituent quark model （hcQM）. The hyper color coulomb plus linear potential is used to calculate the masses ofpositive （up to JP = 7＋/2 ）9 and negative （up to JP = 9-/2）parity excited states. The spin-spin, spin-orbital and tensorinteraction terms are-also incorporated for mass spectra. We have compared our results with other theoretical and lattice QcD predictions for each baryon. Moreover, the known experimental results are also reasonably close to our predicted masses. By using the radial and orbital excitation, we construct Regge trajectories for the baryons in the （n,M2） plane and find their slopes and intercepts. Other properties of these baryons, like magnetic moments, radiative transitions and radiative decay widths, are also calculated successfully.

关键词： baryons potential model Regge trajectories

Synsepalum dulcificum extracts exhibit cytotoxic activity on human colorectal cancer cells and upregulate c-fos and c-jun early apoptotic gene expression

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Asian Pacific Journal of Tropical Biomedicine 2018年第3期8卷 173-178页

作者： Jichang Seong Glenn G.Oyong Esperanza c.cabrera Biology Department De La Salle University Molecular Science Unit Laboratory Center for Natural Science and Environmental Research De La Salle University

Objective: To explore cytotoxicity of Synsepalum dulcificum(S. dulcificum) Daniell(Sapotaceae) on human colon cancer(HcT-116 and HT-29), human monocytic leukemia(THP-1) and normal(HDFn) cell lines, and its effect on the expression of early apoptotic genes, c-fos and c-jun. Methods: Leaf, stem and berry of S. dulcificum were separately extracted by using 2 solvents, 10% ethanol(etOH) and 80% methanol(MeOH). PrestoB lue~? cell viability assay and q RT-PcR assay were conducted to examine the above objectives respectively. Results: Stem MeOH, stem etOH, and berry etOH extracts of S. dulcificum were cytotoxic to HcT-116 and HT-29 human colon cancer cells. For HcT-116, Ic_(50) values of these 3 extracts were not significantly different(P>0.05) from that of the positive control bleomycin(Ic_(50) of 33.57 μg/mL), while for HT-29, Ic_(50) values of these 3 extracts were significantly lower(Pcin(Ic_(50) of 25.24 μg/mL). None of the extracts were cytotoxic to the THP-1 monocytic leukemia cells and HDFn normal human dermal fibroblasts. For both HcT-116 and HT-29, these extracts significantly up-regulated(Pc-fos and c-jun compared to the untreated negative control. conclusions: The results of this study suggest that cytotoxicity of stem MeOH, stem etOH, and berry etOH extracts of S. dulcificum on HcT-116 and HT-29 colon cancer cells is due to the induced apoptosis which is caused by the up-regulation of the expression of early apoptotic genes, c-fos and c-jun.

关键词： Synsepalum dulcificum colon cancer Monocytic leukemia Apoptosis c-fos c-jun

Designing New Alloys with High Strength and Ductility

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材料导报 2020年第13期34卷 13003-13004页

作者： c.Suryanarayana Department of Mechanical and Aerospace Engineering University of Central FloridaOrlandoFL.32816-2450U.S.A

Materials scientists have been constantly on the lookout for materials that simultaneously exhibit high strength and good ductility,which is contrary to common wisdom[1].Earlier attempts to achieve this unusual combination have met with limited success[2].Novel approaches such as a duplex microstructure consisting of nanocrystalline and ultrafine grains yielded encouraging results[3].While the nanocrystalline structure provided high strength,the ultrafine-grained(or relatively coarse-grained)structure provided the needed ductility.

关键词： ductility grain strength

Finite Element Modeling in Drilling of Nimonic c-263 Alloy Using Deform-3D

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computer Modeling in Engineering & Sciences 2019年第3期118卷 679-692页

作者： M.Nagaraj A.John Presin Kumar c.Ezilarasan Rishab Betala Research Scholar Department of Mechanical EngineeringHindustan Institute of Technology and ScienceChennai-603103India Associate Professor Department of Mechanical EngineeringHindustan Institute of Technology and ScienceChennai-603103India Professor Department of Mechanical EngineeringSMK Fomra Institute of TechnologyKelambakkamChennai-603103India Design Engineer ARE PEE PolymerGummidipoondiTiruvallur-601201India

The paper proposes a simulated 3D Finite Element Model(FEM)for drilling of Nickel based super alloy known as Nimonic *** Lagrangian finite element model-based simulations were performed to determine the thrust force,temperature generation,effective stress,and effective *** simulations were performed according to the L27 orthogonal array.A perfect plastic work piece was assumed,and the shape is considered to be *** spindle speed,feed rate,and point angle were considered as the input *** work piece was modeled by Johnson-cook(Jc)material model and tungsten carbide(Wc)was chosen as the drill bit and the body was assumed to be *** demonstrative results of the thrust force and the temperature at drill bit cutting edge were substantiated with the simulated results and a percentage error was observed within 10%.Further,simulated results of effective stress and strain were also observed.

关键词： Nimonic c-263 Thrust force temperature effective stress effective strain deform-3D simulation

EFFEcT OF cHLORIDE ON THE ATMOSPHERIc cORROSION OF SIMULATED ARTIFAcT IRON IN NO_3^- BEARING POLLUTANT ENVIRONMENT

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Acta Metallurgica Sinica(English Letters) 2006年第1期19卷 34-42页

作者： X. cao c.c. Xu Beijing University of chemical Technology Beijing 100029 China

The effect of chloride in nitrogen-bearing pollutant on the atmospheric corrosion of cast iron was investigated by using periodic wet-dry test, electrochemical experiment and surface tension test. Scanning electron microscopy （SEM） with energy disperse atomic X-ray （EDAX） was used to identify the corrosion processes and products. The results of the weight loss measurement showed that the whale corrosion kinetics can be approximately described by： AW=At^8. With the addition of NacI, B increases. The result presented that cI^- accelerated the corrosion rate obviously during the whale corrosion process. The initial corrosion process was investigated from the viewpoint of surface tension. At the initial corrosion period, the corrosion rate was proportion to the adsorption of anions contained the solutions. And as corrosion went on, the penetration effect of anions and different characteristics of the corrosion products began to dominant the corrosion process, which led to the accelerated effect.

关键词： corrosion simulated archaeological iron corrosion rate chloride,nitrogen-bearing pollutant

Hot cracking in AZ31 and AZ61 Magnesium Alloy

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Journal of Materials Science & Technology 2011年第7期27卷 633-640页

作者： c.J. Huang c.M. cheng c.P. chou F.H. chen Department of Mechanical Engineering National Chiao Tung University Hsinchu 300 Taiwan China Department of Industrial Education National Taiwan Normal University Taipei 106 Taiwan China

This paper examined the impact of the number of thermal cycles and augmented strain on hot cracking in AZ31 and AZ61 magnesium alloy. Statistical analyses were performed. Following observation using a scanning electron microscope （SEM）, an energy dispersive spectrometer （EDS） was used for component analysis. Results showed that Al content in magnesium alloy has an effect on hot cracking susceptibility. In addition, the nonequilibrium solidification process produced segregation in Al content, causing higher liquid Mg-alloy rich Al content at grain boundaries, and resulting into liquefied grain boundaries of partially melted zone （PMZ）. In summary, under multiple thermal cycles AZ61 produced serious liquation cracking. AZ61 has higher （6 wt%） Al content and produced much liquefied Mg17Al12 at grain boundaries under multiple thermal cycles. The liquefied Mg17Al12 were pulled apart and hot cracks formed at weld metal HAZ due to the augmented strain. Since AZ31 had half the Al content of AZ61, its hot-cracking susceptibility was lower than AZ61. In addition, AZ61 showed longer total crack length （TcL） in one thermal cycle compared to that in three thermal cycles. This phenomenon was possibly due to high-temperature gasification of Al during the welding process, which resulted in lower overall Al content. consequently, shorter hot cracks exhibited in three thermal cycles. It was found the Al content of AZ31 and AZ61 can be used to assess the hot-cracking susceptibility.

关键词： Varestraint test Thermal cycles Hot-cracking susceptibility Gas tungsten arc welding (GTAW) AZ31 AZ61