16,023 research outputs found
Novel MoP/HY catalyst for the selective conversion of naphthalene to tetralin
No full text
MoP catalyst supported on HZSM-5, HBeta and HY were prepared by wet impregnation and temperature programmed reduction (H-2-TPR), applied for the conversion of naphthalene to tetralin, and characterized by XRD, SEM, TEM, BET, H-2-TPR, and NH3-TPD. Catalytic tests revealed the highest selectivity to tetralin was observed over MoP/HY with a naphthalene conversion of 85% and a tetralin selectivity of 99%. The effect of temperature and liquid hourly space velocity (LHSV) was also studied. Well dispersed and small particles of MoP, reduced pore size and weak acidity of HY contribute to enhanced catalytic activity and selectivity in conversion of naphthalene to tetralin. (C) 2014 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.</p
Hardness of T-carbon: Density functional theory calculations
No full textWe reconsider and interpret the mechanical properties of the recently proposed allotrope of carbon, T-carbon [Sheng et al., Phys. Rev. Lett. 106, 155703 (2011)], using density functional theory in combination with different empirical hardness models. In contrast with the early estimation based on Gao et al.'s model, which attributes to T-carbon a high Vickers hardness of 61 GPa comparable to that of superhard cubic boron nitride (c-BN), we find that T-carbon is not a superhard material, since its Vickers hardness does not exceed 10 GPa. Besides providing clear evidence for the absence of superhardness in T-carbon, we discuss the physical reasons behind the failure of Gao et al.'s and Simunek and Vackar's (SV) models in predicting the hardness of T-carbon, residing in their improper treatment of the highly anisotropic distribution of quasi-sp(3)-like C-C hybrids. A possible remedy for the Gao et al. and SV models based on the concept of the superatom is suggested, which indeed yields a Vickers hardness of about 8 GPa
Mice lacking C1q or C3 show accelerated rejection of minor H disparate skin grafts and resistance to induction of tolerance
No full textComplement activation is known to have deleterious effects on organ transplantation. On the other hand, the complement system is also known to have an important role in regulating immune responses. The balance between these two opposing effects is critical in the context of transplantation. Here, we report that female mice deficient in C1q (C1qa(-/-)) or C3 (C3(-/-)) reject male syngeneic grafts (HY incompatible) at an accelerated rate compared with WT mice. Intranasal HY peptide administration, which induces tolerance to syngeneic male grafts in WT mice, fails to induce tolerance in C1qa(-/-) or C3(-/-) mice. The rejection of the male grafts correlated with the presence of HY D(b)Uty-specific CD8(+) T cells. Consistent with this, peptide-treated C1qa(-/-) and C3(-/-) female mice rejecting male grafts exhibited more antigen-specific CD8(+)IFN-gamma(+) and CD8(+)IL-10(+) cells compared with WT females. This suggests that accumulation of IFN-gamma- and IL-10-producing T cells may play a key role in mediating the ongoing inflammatory process and graft rejection. Interestingly, within the tolerized male skin grafts of peptide-treated WT mice, IFN-gamma, C1q and C3 mRNA levels were higher compared to control female grafts. These results suggest that C1q and C3 facilitate the induction of intranasal tolerance.</p
Pathogenicity of a birnavirus to hard clam (Meretrix-lusoria) and effect of temperature stress on its virulence.
No full textFinding Hy-Brasil: The Gateway Between Reality And Unreality
No full textThrough Irish history, different spiritual demands in specific historical moments impacts on the legends of Hy-Brasil. In turn, the stories of Hy-Brasil reflects the history of Ireland through its possible position, appearances, items events, viewpoints gateways and monuments. The project is to use the history of Hy-Brasil, a mystical island of Ireland, to explore the architecture of myth, which are expected to be triggered and formed by the current situation of Ireland. It looks to design a pragmatic space by providing a gateway to the mythic island of Hy-Brasil. Siting on the north end the Ireland, the Lough Foyle in Donegal, the project constructs an architectural artifact out of a particular strata of Ireland’s specific geology and monumental landscape to take people into the imagination and expectation of perceive the Irish mythology.The Berlage Post-MSc in Architecture and Urban Desig
Electronic, optical, and mechanical properties of superhard cold-compressed phases of carbon
No full textBy means of standard and hybrid density functional theory, we analyzed the electronic, optical, and mechanical properties of the two discovered superhard orthorhombic (W) and monoclinic (M) phases of carbon, synthesized by cold compression. We demonstrated that both phases exhibit a transparent insulating behaviour with indirect band gaps of about 5.4 eV (W) and 4.5 eV (M), and highly isotropic optical spectra, substantially different to those of the related body centered tetragonal C-4 phase. The analysis of the elastic constants and Vickers hardness confirmed that these phases are as hard as the second hardest material c-BC2N (C) 201/ American Institute of Physics. [doi:10.1063/1.3610996
Local electronic structure of LiMn2O4 probed by solid state Li-7-NMR
No full text[[abstract]]Crystalline LiMn2O4 materials were synthesized through a low temperature reflux (LTR) process. The LTR material exhibits an essential electrochemical behavior to present only one transition during the charge/discharge process and gives promises for the future application. The X-ray data hardly distinguishes either conventional high temperature (HT) or LTR material since both materials possess similar molecular structure. However, solid-state NMR results suggest substantial difference for their electronic structure. The Li-7-NMR of HT material exhibits the isotropic peak at 529 ppm and spreads for 160 kHz wide indicating the interaction between the lithium nucleus and the conducting electrons around the nucleus. The LTR material presents the main isotropic peak at 217 ppm but spreads for almost 400 kHz wide asymmetrically implying the existence of multiple electronic environments. (C) 2001 Elsevier Science Ltd. All rights reserved.[[note]]SC
Backbone Conformation Modulation in Quinoxaline based Copolymers for Non-Fullerene Organic Solar Cells
No full textIdentification of two novel RET kinase inhibitors through MCR-based drug discovery: design, synthesis and evaluation
No full textFrom an MCR fragment library, two novel chemical series have been developed as inhibitors of RET, which is a kinase involved in the pathology of medullary thyroid cancer (MTC). Structure activity relationship studies (SAR) identified two sub-micromolar tractable leads, 6g and 13g. 6g was confirmed to be a Type-II RET inhibitor. 13g and 6g inhibited RET in cells transformed by RET/C634. A RET DFG-out homology model was established and utilized to predict Type-II inhibitor binding modes
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