| 1. |
- Feng, Qingguo, et al.
(author)
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An advanced multi-orbital impurity solver for dynamical mean field theory based on the equation of motion approach
- 2012
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In: Journal of Physics. - : IOP Publishing. - 0953-8984 .- 1361-648X. ; 24:5, s. 055603-
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Journal article (peer-reviewed)abstract
- We propose an improved fast multi-orbital impurity solver for the dynamical mean field theory based on equations of motion (EOM) for Green's functions and a decoupling scheme. In this scheme the inter-orbital Coulomb interactions are treated fully self-consistently, and involve the inter-orbital fluctuations. As an example of the use of the derived multi-orbital impurity solver, the two-orbital Hubbard model is studied for various cases. Comparisons are made between numerical results obtained with our EOM scheme and those obtained with quantum Monte Carlo and numerical renormalization group methods. The comparison shows a good agreement, but also reveals a dissimilarity of the behaviors of the densities of states which is caused by inter-site inter-orbital hopping effects and on-site inter-orbital fluctuation effects, thus corroborating the assertion of the value of the EOM method for the study of multi-orbital strongly correlated systems.
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| 2. |
- Abderrazek, K., et al.
(author)
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Photocatalytic degradation of indigo carmine using [Zn-Al] LDH supported on PAN nanofibres
- 2015
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In: Clay minerals. - : Mineralogical Society. - 0009-8558 .- 1471-8030. ; 50:2, s. 185-197
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Journal article (peer-reviewed)abstract
- Zn-Al layered double hydroxides (LDH), before and after calcination, were tested for the removal of indigo carmine (IC) dye from solution. These LDH photocatalysts were characterized by powder x-ray diffraction (PXRD), Fourier transform infrared (FTIR) spectroscopy, thermogravimetry/differential thermogravimetry (TG/DTG), nitrogen physisorption at -196 degrees C, scanning electron microscopy (SEM) and diffuse reflectance spectrophotometry (DRS). The different photocatalysts were supported on polyacrylonitrile (PAN) nanofibres, so that filtration was unnecessary. The PXRD and FTIR analyses showed that the IC adsorption on c-Zn-Al-3-500 (LDH calcined at 500 degrees C) was enhanced by construction of the hydrotalcite matrix intercalated with the dye. The intercalation was clearly evidenced by the appearance of a peak at low degrees 2 theta values. All of the materials prepared exhibited photocatalytic activity, which for the c-Zn-Al-3-500 was comparable to that of commercial PAN-supported ZnO nanoparticles (100% degradation after 180 min). Kinetic studies showed that the degradation of the IC followed a pseudo-first order rate. The high activity and the ease of both synthesis and separation processes rendered this photocatalyst a promising candidate for environmental remediation.
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| 3. |
- Feng, Pei Zhong, et al.
(author)
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Study on Oxidation Behavior of (W, Mo) Si2 Powders in Air at 400, 500 and 600textordmasculineC
- 2007
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In: Progress in powder metallurgy. - Uetikon-Zürich : Trans Tech Publications Inc.. ; , s. 1289-1292
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Conference paper (peer-reviewed)abstract
- The oxidation of (W,Mo)Si2 powders has been examined at 400, 500 and 600°C for 12.0 hours in air. It was shown that the low temperature oxidation resistance of (W,Mo)Si2 was worse than that of MoSi 2, and they showed great changes in mass, volume and colour. At 500°C, the amount of volume expansion of (W,Mo)Si2 was as high as about 7-8 times and color changed from black to yellow after 4.0h with MoO 3, WO3, (W,Mo)O3 and amorphous SiO2 as main reaction products. It took about 8.0h to obtain the same results for MoSi2. The mass gain and oxidation rate were relatively slower at 400°C and 600°C than that at 500°C These were probably due to the lower oxidation rate at 400°C and the protective silica glass on surface of powders formed from the volatilization of MoO3, WO3 and (W,Mo)O3 at 600°C, which would restrain the diffusion of molybdenum from matrix to exterior and oxygen from outside to inside and the further accelerated oxidation.
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| 4. |
- François, Camille, et al.
(author)
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Design and synthesis of biobased epoxy thermosets from biorenewable resources
- 2017
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In: Comptes rendus. Chimie. - : Elsevier BV. - 1631-0748 .- 1878-1543. ; 20:11-12, s. 1006-1016
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Journal article (peer-reviewed)abstract
- Biobased diepoxy synthons derived from isoeugenol, eugenol or resorcinol (DGE-isoEu, DGE-Eu and DGER, respectively) have been used as epoxy monomers in replacement of the diglycidyl ether of bisphenol A (DGEBA). Their curing with six different biobased anhydride hardeners leads to fully biobased epoxy thermosets. These materials exhibit interesting thermal and mechanical properties comparable to those obtained with conventional petrosourced DGEBA-based epoxy resins cured in similar conditions. In particular, a high T-g in the range of 90-130 degrees C and instantaneous moduli higher than 4.3 GPa have been recorded. These good performances are very encouraging, making these new fully biobased epoxy thermosets compatible with the usual structural application of epoxy materials.
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| 7. |
- Ranjan, Ram Krishna
(author)
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Elephant Trumpet. In/out of the black box
- 2022
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In: Inmaterial. - : Bau, Centre Universitari de Disseny. - 2462-5892. ; 7:14, s. 64-103
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Journal article (peer-reviewed)abstract
- This text weaves reflections on the (im)possibility of foregrounding caste-subalterns’, specifically Dalits’ experiences and imaginations of the Bengal Famine of 1943. This text is in conjunction with, next to, between, and in/out of the film You deny my living and I defy my death. The film has emerged as a result of a collaborative-performative workshop between two caste-subalterns, initiated and organised in the context of a PhD in Artistic Practice. Just like the workshop, the film is also animated by the desire to complicate the dominant representational realm ascribed to Dalits, which is often either essentialising or reductive. The film explores methodological and aesthetical approaches to go beyond the default imaginaries. Constructed across multiple modes, genres, fragments, and layers, this text aims to expand, extend, inflect, and build on the key themes explored in the workshop and the film. Some text precedes the workshop and film, some emerged during the process, and some came afterwards. Mobilising iterative and assemblage-style writing, this text anchors itself in the Bengal Famine of 1943 to critically engage with ideas around ‘critical presence’ and the ‘representation’ of Dalits. The text also aims to explore notions around malnutrition, hunger, starvation, and famine as categories, ‘recovery and representation’ of caste-subaltern histories in the context of famine, opacity and affect as aesthetic choices, and collaborative practice as a method.
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