57,697 research outputs found
Revealing the influence of Mo addition on interphase precipitation in Ti-bearing low carbon steels
No full textMo is widely used as an effective microalloying element to improve mechanical performance of interphase precipitation steels, but the precise role of Mo in interphase precipitation behavior is not fully understood. In this contribution, interphase precipitation behavior in a series of Ti-Mo-bearing low carbon steels is systematically studied, and the role of Mo in interphase precipitates and its coarsening behavior is revisited. It is found that (Ti, Mo)C precipitates instead of TiC are formed in the Mo-containing alloys, and the average site fraction of Mo in (Ti, Mo)C is almost independent of the bulk Mo content. Moreover, the number density of interphase precipitates can be substantially enhanced by a minor addition of Mo, albeit it does not further rise with increasing the bulk Mo content. This is because the Mo fraction in (Ti, Mo)C rather than the bulk Mo content governs the driving force for precipitation nucleation and the interfacial energy of the (Ti, Mo)C/α and (Ti, Mo)C/γ interfaces. In addition to the reduced interfacial energy, decrease of Ti trans-interface diffusivity has been identified as another key reason for the enhanced carbide coarsening resistance in Mo-containing alloys.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Novel Aerospace Material
Charge-carrier mediated ferromagnetism in Mo-doped In2O3 films
No full textWe investigated the correlation between the ferromagnetism and electric resistivity of Mo-doped (3-10 at.) In 2O 3 films. We find that the saturation magnetization increases with the Mo concentration until it reaches its maximum at 7 at. Mo doping (7.1 emu/cm 3), after which it rapidly decreases upon higher doping concentration. Interestingly, the resistivity reveals opposite behavior with the Mo concentration, showing a minimum value at 7 at. Mo doping. According to the temperature-dependent resistivity and the Hall effect measurements, we find that the samples with higher magnetization show metallic behavior with higher electron concentration. Notably, the samples show a linear relationship between the carrier concentration and the degree of magnetization. We believe the ferromagnetism in Mo-doped In 2O 3 is ascribed to the indirect exchange interaction mediated by the charge carriers. © 2012 American Institute of Physics.
Compositive role of refractory element Mo in improving strength and ductility of face-centered-cubic complex concentrated alloys
No full textComplex concentrated alloys (CCAs) with a face-centered-cubic (FCC) structure exhibit remarkable mechanical properties, introducing the expansion of compositional space in alloy design for structural materials. The formation of a single solid-solution phase is enabled by configuring various 3d-transition elements, while doping other elements even of a small portion generally leads to the formation of brittle intermetallic compounds. Herein, we demonstrate through a systematic investigation of single FCC (CoNi)100-xMox alloys that a wide range of refractory element Mo can simultaneously improve the strength and ductility while sustaining the solid-solution structure. The addition of Mo with a larger atomic size than those of 3d-transition elements introduces severe lattice distortion in the FCC lattice and causes grain-boundary segregation enriched by Mo atoms. In addition, increasing Mo content effectively reduces the stacking fault energy (SFE). The increased lattice distortion with Mo content enhances the solid-solution strengthening of the alloys. Besides, along with reduced SFE and stabilization of the dislocation emission site by grain-boundary segregation, this elevated solid-solution strengthening increases grain-boundary strengthening, reaching a yield strength of ∼1 GPa. Moreover, the reduction of SFE with increasing Mo results in the transition of dislocation substructures and the refinement of deformation twins, allowing for enhanced strain-hardening capability and thus ∼1.3 GPa tensile strength and ∼50% ductility. Such compositive and synergetic effects of refractory element Mo enable the CCAs with a single FCC solid solution to overcome the strength and ductility trade-off.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Team Marcel Sluite
Honey, honey baby, honey don't you love no mo,
No full textvoiceCollected by Richard N. Shollmier For M. C. Parler Transcribed by Richard N. Shollmier
Sung by
Mr. Luther Shackelford Pine Bluff, Arkansas 23 December 1959
Reel 339, Item 8
Honey, honey baby, honey don't you love no mo, Honey, honey baby, honey don't you love no mo,
I dont know, baby won't you come back home, Honey, honey baby, won't you come on back home.Funding for digitization provided by the Arkansas Humanities Council and the Happy Hollow Foundation
density functional theory and molecular dynamics studies
No full text학위논문(박사) - 한국과학기술원 : 신소재공학과, 2009. 8., [ ix, 204 p. ]“Trial and Error” the traditional experimental synthesis and subsequent analysis of catalysts has been a widely applied strateagy in designing new heterogeneous catalysts. In this thesis, I use a computational approach, as a substitute of erroneous and time consuming experimental method, to study several interesting and most hot topics in the field of heterogeneous catalyst. Computational approach allows us to separately study a complex reaction pathway and to analyze the effect of a structure, composition, and a dimension of a catalyst. On account of such benefits of computational method, I set an object of this study to “Catalyst activation by designed reaction center.”
In Chaper 1, the combined computational method of a molecular dynamics, the modified basin-hopping Monte Carlo simulation, and the Density Functional Theory is applied to study an Ag-Pd bimetallic nano cluster. The temperature dependent structural evolution, the surface catalytic reaction, and the structure dependent catalytic activity of nano clusters are discussed. I show that a small Ag-Pd bimetallic nano cluster can be a robust catalyst for CO oxidation. Solute element acted not only a reaction modifier but also a structural stabilizer. In Chapter 2 and 3, I expand the scope of the study to metal oxide catalysts. In Chapter 2, doped metal oxides are suggested as a new kind of oxidation catalyst. The modified catalytic activity of V, Cr, Mo, W, or Mn doped catalyst is tested via CO oxidation. I propose the vacancy formation energy as a reaction descriptor. In Chapter 3, the reaction mechanism of methanol dehydrogenation catalyzed by supported VOx, MoOx, and CrOx catalysts is analyzed. The location of the reactive surface oxygen species is studied by a state-of-art Density Functional Theory.한국과학기술원 : 신소재공학과
Author, publisher and bookseller : a tripartite synergy in Nigerian book industry
No full textThis work is about the roles of Author, Publisher and Bookseller in Book development in
Nigeria. The paper started by delving into the history of Book Publishing in Nigeria after
which it proceeded by defining who an author, a publisher, and a bookseller is and
expatiated on the indispensable roles of these key actors in Nigerian Book Industry and in
the emerging Information Society. Furthermore, the various constraints to book
development were identified while the paper advised on how the Book Industry can be
further promoted in Nigeria. However, the paper concluded and made recommendations
on how the Book sector can help in enhancing scholarship in the country
Preferential segregation of Pd atoms in the Ag-Pd bimetallic cluster: Density functional theory and molecular dynamics simulation
No full textClassical molecular dynamics simulations of the coalescence between an Ag cluster composed of 135 atoms and a Pd cluster of 16 atoms were performed at 500 K. All Pd atoms penetrated into the Ag cluster and preferentially segregated at the subsurface layer. The density functional theory calculations revealed that the center site is the most stable position for Pd atoms. However, the energy barrier for further penetration of Pd atoms located at the subsurface was too high to overcome, and thus a metastable structure with Pd atoms segregated at the subsurface did not evolve
Atomistic simulation study of deformation twinning of nanocrystalline body-centered cubic Mo
No full textDeformation twinning of nanocrystalline body-centered cubic Mo was studied using molecular dynamics simulations, and the effects of grain sizes and temperatures on the deformation were evaluated. With small grain size, grain rotation accompanying grain growth was found to play important role in nanocrystalline Mo during tensile deformation. Additionally, grain rotation and the deformation controlled by GB-mediated processes induce to the difficulty of creating crack. Twin was formed by successive emission of twinning partials from grain boundaries in small grain size systems. However, the twin mechanisms of GB splitting and overlapping of two extended dislocations were also found in larger size grain. Twin induced crack tips were observed in our simulation, and this confirmed the results of previous molecular dynamics simulations. At higher temperatures, GB activities can be thermally activated, resulting in suppression of twinning tendency and improvement of ductility of nanocrystalline Mo.Xiaofeng Tian, Dan Li, You Yu, Zhen Jiang You, Tongye Li, Liangquan G
A new species of Procontarinia (Diptera: Cecidomyiidae) damaging fruit of mango, Mangifera indica (Anacardiaceae), in China
No full textJiao, Ke-Long, Mo, Jian-You, Kolesik, Peter (2018): A new species of Procontarinia (Diptera: Cecidomyiidae) damaging fruit of mango, Mangifera indica (Anacardiaceae), in China. Zootaxa 4413 (2): 368-376, DOI: 10.11646/zootaxa.4413.2.
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