854 research outputs found
MSJ786058_supplementary_table_2 – Supplemental material for Primary optic neuropathy in Behçet’s syndrome
No full textSupplemental material, MSJ786058_supplementary_table_2 for Primary optic neuropathy in Behçet’s syndrome by Qinglin Yang, Lin Sun, Qian Wang, Jiawei Wang, Chao Meng, Qinglin Chang, Xuehui Shi, Shilei Cui, Lei Liu and Chuntao Lai in Multiple Sclerosis Journal</p
MSJ786058_supplementary_table_1 – Supplemental material for Primary optic neuropathy in Behçet’s syndrome
No full textSupplemental material, MSJ786058_supplementary_table_1 for Primary optic neuropathy in Behçet’s syndrome by Qinglin Yang, Lin Sun, Qian Wang, Jiawei Wang, Chao Meng, Qinglin Chang, Xuehui Shi, Shilei Cui, Lei Liu and Chuntao Lai in Multiple Sclerosis Journal</p
MSJ786058_supplementary_figures – Supplemental material for Primary optic neuropathy in Behçet’s syndrome
No full textSupplemental material, MSJ786058_supplementary_figures for Primary optic neuropathy in Behçet’s syndrome by Qinglin Yang, Lin Sun, Qian Wang, Jiawei Wang, Chao Meng, Qinglin Chang, Xuehui Shi, Shilei Cui, Lei Liu and Chuntao Lai in Multiple Sclerosis Journal</p
A spatial-fractional thermal transport model for nanofluid in porous media
No full textHighlights\ud
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• A spatial fractional-order model is derived for heat transfer of nanofluid.\ud
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• The model may be capable of describing enhanced convective heat transfer in nanofluid in disordered porous media.\ud
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• Effects of parameters on temperature and local Nusselt number are analyzed.\ud
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Abstract\ud
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In this paper, a spatial fractional-order thermal transport equation with the Caputo derivative is proposed to describe convective heat transfer of nanofluids within disordered porous media in boundary layer flow. This equation arises naturally when the effect of anomalous migration of nanoparticles on heat transfer is considered. The numerical results show that local Nusselt numbers of four different kinds of nanofluids are all inversely proportional to the fractional derivative exponent β. Based on this finding, it is concluded that the anomalous diffusion of nanoparticles improves the convective heat transfer of nanofluids and the space fractional thermal transport equation may serve as a candidate model for studying nanofluids. Additionally, the effects of other involved physical parameters on temperature distribution and Nusselt number are presented and analyzed.\ud
Keywords\ud
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Fractional calculus; Nanofluids; Caputo derivative; Random walks; Lévy flight
Application of 1D attapulgite as reservoir with benzotriazole for corrosion protection of carbon steel
No full textThe development of active systems to protect metal substrates against corrosion by using inhibitor loaded nanocontainers is a promising approach for many industrial applications. This study introduces attapulgite as a reservoir for loading a corrosion inhibitor (benzotriazole). As a key component, inhibitor loaded attapulgite was dispersed in a water-based epoxy coating to protect carbon steel. The release behavior of the encapsulated inhibitor from the attapulgite nanocontainers in response to pH variation was investigated using UV-visible spectroscopy. The corrosion properties of the composite coatings were explored by electrochemical impedance spectroscopy. The coating with inhibitor-loaded attapulgite demonstrated enhanced film barrier properties compared with blank coating. The scratched coating with inhibitor-loaded attapulgite showed increased corrosion resistance relative to that of the blank coating after immersion and hence exhibited an active corrosion protection. The coating's self-healing mechanism can be attributed to the passive film formation on the metal surface promoted by the inhibitor release from the nanocontainers. (C) 2017 Elsevier B.V. All rights reserved
Unsteady Marangoni convection heat transfer of fractional Maxwell fluid with Cattaneo heat flux
No full textHighlights\ud
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• Unsteady Marangoni convection heat transfer of viscoelastic fluid over flat surface with variable heat flux are investigated.\ud
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• Fractional shear stress and Cattaneo heat flux models are introduced firstly in characterizing constitutive relations.\ud
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• Numerical solutions are obtained and some novel phenomena are found.\ud
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• Effects of fractional derivative, Marangoni number and power law exponent on velocity and temperature fields are analyzed.\ud
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Abstract\ud
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Fractional shear stress and Cattaneo heat flux models are introduced in characterizing unsteady Marangoni convection heat transfer of viscoelastic Maxwell fluid over a flat surface. Governing equations and boundary condition are formulated firstly via the balance between the surface tension and shear stress. Numerical solutions are obtained by new developed numerical technique and some novel phenomena are found. Results shown that the fractional derivative parameters, Marangoni number and power law exponent have significant influence on characteristics velocity and temperature fields. As fractional derivative parameters increase, the temperature profiles rises remarkably and the viscoelastic effects of the fluid enhance with delayed response to surface tension, however the temperature profiles decline significantly with a thinner thickness of thermal boundary layer with the increase of Marangoni number. The average skin friction coefficient increases with the augment of Marangoni number, while the average Nusselt number decreases for larger values of power law exponent.\ud
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Keywords\ud
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Marangoni convection; Maxwell fluid; Fractional Cattaneo model; Surface tension; Variable heat flu
Structure Elucidation of a Pyrazolo[3,4]pyran Derivative by NMR Spectroscopy
No full textThe structure of a representative pyrazolo[3,4]pyran derivative was determined by 1D and 2D NMR techniques. Complete 1H and 13C chemical shifts for this compound are reported. Careful analysis of the HMBC (Heteronuclear Multi-Bond Correlation) spectrum helped to elucidate the configuration of the derivative around C7 and C8. The results showed that the characteristic double-strong and double-weak cross peak pattern in the HMBC spectrum for C7 and C8 might be useful for establishing the structures of other pyrazolo[3,4]pyran derivatives
PREPARATION AND ELECTRORHEOLOGICAL EFFECT OF ACETAMIDE-MODIFIED TITANATE NANOTUBE SUSPENSIONS INSTRUCTIONS
No full textTitanate nanotube (TN) synthesized by hydrothermal reaction of titania nanoparticles in alkali solution, then the TNs were modified by acetamide. X-ray diffraction analyses, scanning electron microscopy and Fourier transform infrared spectrometry are used to determine the structure of the TNs. Under DC electric field, the yield stress of these acetamide-modified TN suspensions shows large yield stress. It is also found that the ER effect is sensitive to the wettability of the TNs
Characteristics of the Chinese vocabulary learning process of advanced native English speaking students
No full textLanguage learning goes from input to output, and during this process the learners’ developing language is referred to as "interlanguage". This thesis investigates this process from a second language teacher's point of view, starting from the learners’ output - their "feedback". The method employed is to analyse the results of a survey of word usage errors committed by advanced native English speaking learners of Chinese in writing compositions, and categorise the errors according to type. Contrastive analysis of the two languages, and interlanguage theory is used to deduce the reasons for these errors and the roles played by the native language and the target language in their learning strategies. The general features of advanced learners' interlanguage in their vocabulary usage are described, the phenomenon of regression, or increased dependency on the mother tongue in particular aspects of the learning process, is noted and reasons for this suggested. It is concluded that there are objective and subjective reasons for these errors, and that improvements to textbooks, learning strategies and teaching methods should help to alleviate the difficulties students presently experience in vocabulary usage at the advanced stage and allow their learning process to progress more smoothly
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