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排序方式: 共有238条查询结果,搜索用时 15 毫秒
231.
Communicated by
P. Rabinowitz 相似文献
232.
Howard Yi Fan Sim Jaslyn Ru Ting Chen Charlynn Sher Lin Koh Hiang Kwee Lee Xuemei Han Gia Chuong Phan‐Quang Jing Yi Pang Chee Leng Lay Srikanth Pedireddy In Yee Phang Edwin Kok Lee Yeow Xing Yi Ling 《Angewandte Chemie (International ed. in English)》2020,59(39):16997-17003
The electrochemical nitrogen reduction reaction (NRR) offers a sustainable solution towards ammonia production but suffers poor reaction performance owing to preferential catalyst–H formation and the consequential hydrogen evolution reaction (HER). Now, the Pt/Au electrocatalyst d‐band structure is electronically modified using zeolitic imidazole framework (ZIF) to achieve a Faradaic efficiency (FE) of >44 % with high ammonia yield rate of >161 μg mgcat?1 h?1 under ambient conditions. The strategy lowers electrocatalyst d‐band position to weaken H adsorption and concurrently creates electron‐deficient sites to kinetically drive NRR by promoting catalyst–N2 interaction. The ZIF coating on the electrocatalyst doubles as a hydrophobic layer to suppress HER, further improving FE by >44‐fold compared to without ZIF (ca. 1 %). The Pt/Au‐NZIF interaction is key to enable strong N2 adsorption over H atom. 相似文献
233.
B. B. Manna P. N. Srikanth 《NoDEA : Nonlinear Differential Equations and Applications》2014,21(6):915-927
Let \({A=\{x\in \mathbb{R}^{2m}: 0 < a < |x| < b\}}\) be an annulus. We consider the following singularly perturbed elliptic problem on A $$\left\{\begin{array}{lll}-\varepsilon ^2{\Delta u} + |x|^{\eta}u =|x|^{\eta}u^p, \quad {\rm in} A,\\ u > 0, \quad \quad \quad \quad \quad \quad \quad {\rm in} A, \\ u=0, \quad \quad \quad \quad \quad \quad \quad {\rm on}\partial A,\end{array}\right. $$ where \({1 < p < \frac{m+3}{m-1}}\) . We shall prove the existence of a positive solution \({u_\epsilon }\) which concentrates on two different orthogonal spheres of dimension (m?1) as \({\varepsilon \to 0}\) . We achieve this by studying a reduced problem on an annular domain in \({\mathbb{R}^{m+1}}\) and analysing the profile of a two point concentrating solution in this domain. 相似文献
234.
Venkata Ramana Gedela Vadali Venkata Satya Siva Srikanth 《Applied Physics A: Materials Science & Processing》2014,115(1):189-197
Granular type polyaniline (PANi), PANi nanofibers (NFs), and PANi nanotubes (NTs) expedient as working electrode materials for supercapacitors are synthesized. The synthesis procedure used in this work facilitates not only the synthesis of solid powders of the PANi nanostructures, but also thin films constituted by the same PANi nanostructures in the same experiment. PANi NFs are found to exhibit faster electrode kinetics and better capacitance when compared to PANi NTs and granular PANi. Specific capacitance and energy storage per unit mass of PANi NFs are 239.47 Fg?1 (at 0.5 Ag?1) and 43.2 Wh?kg?1, respectively. Electrical conductivity of PANi NFs is also better when compared to the other two nanostructures. Properties of the three PANi nanostructures are explicated in correlation with crystallinity, intrinsic oxidation state, doping degree, BET surface area, and ordered mesoporosity pertaining to the nanostructures. 相似文献
235.
V.V.S.S. Srikanth T. Staedler X. Jiang 《Applied Physics A: Materials Science & Processing》2008,91(1):149-155
Nanocrystalline diamond/β-SiC composite films are synthesized by microwave plasma chemical vapor deposition using a gas mixture
of H2, CH4, and tetramethylsilane (Si(CH3)4, TMS) in a single process step. Structural and compositional analyses revealed that the films consist of a mixture of diamond
and β-SiC nanocrystalline phases in a desired volume fraction combinatorial form. Transmission electron microscopy analysis
confirmed the X-ray diffraction results and showed that the major diffraction lines corresponded to a two-component nanocrystalline
composite film. Infrared spectroscopic analysis showed that the content of β-SiC in the films can be increased by increasing
the TMS concentration. This correlated very well with electron probe microanalysis and Rutherford backscattering analysis
that showed an almost linear correspondence of β-SiC content in the films with the TMS concentration in the gas phase. The
phase purity of the diamond crystallites decreased with increase in the β-SiC content in the films, as shown by micro Raman
scattering studies. Smooth surface morphologies are measured for these films by using atomic force microscopy; the root mean
square roughness was 12 ± 1 nm. The β-SiC volume fraction (vol. %) was identified as an important compositional factor to
determine any mechanical and frictional properties of these films.
PACS 68.55.-a; 68.55.Nq; 68.60.-p 相似文献
236.
Kamzin A. S. Valiullin A. A. Khurshid H. Nemati Z. Srikanth H. Phan M. H. 《Physics of the Solid State》2018,60(2):382-389
Physics of the Solid State - FeO/Fe3O4 nanoparticles were synthesized by thermal decomposition. Electron microscopy revealed that these nanoparticles were of the core-shell type and had a spherical... 相似文献
237.
Charles Gnanaraj Mahendran Sekar Shivkanya Fuloria Shasank S. Swain Siew Hua Gan Kumarappan Chidambaram Nur Najihah Izzati Mat Rani Tavamani Balan Sarah Stephenie Pei Teng Lum Srikanth Jeyabalan M. Yasmin Begum Vivek Chandramohan Lakshmi Thangavelu Vetriselvan Subramaniyan Neeraj Kumar Fuloria 《Molecules (Basel, Switzerland)》2022,27(9)
Parkinson’s disease (PD) and Alzheimer’s disease (AD) are neurodegenerative disorders that have emerged as among the serious health problems of the 21st century. The medications currently available to treat AD and PD have limited efficacy and are associated with side effects. Natural products are one of the most vital and conservative sources of medicines for treating neurological problems. Karanjin is a furanoflavonoid, isolated mainly from Pongamia pinnata with several medicinal plants, and has been reported for numerous health benefits. However, the effect of karanjin on AD and PD has not yet been systematically investigated. To evaluate the neuroprotective effect of karanjin, extensive in silico studies starting with molecular docking against five putative targets for AD and four targets for PD were conducted. The findings were compared with three standard drugs using Auto Dock 4.1 and Molegro Virtual Docker software. Additionally, the physiochemical properties (Lipinski rule of five), drug-likeness and parameters including absorption, distribution, metabolism, elimination and toxicity (ADMET) profiles of karanjin were also studied. The molecular dynamics (MD) simulations were performed with two selective karanjin docking complexes to analyze the dynamic behaviors and binding free energy at 100 ns time scale. In addition, frontier molecular orbitals (FMOs) and density-functional theory (DFT) were also investigated from computational quantum mechanism perspectives using the Avogadro-ORCA 1.2.0 platform. Karanjin complies with all five of Lipinski’s drug-likeness rules with suitable ADMET profiles for therapeutic use. The docking scores (kcal/mol) showed comparatively higher potency against AD and PD associated targets than currently used standard drugs. Overall, the potential binding affinity from molecular docking, static thermodynamics feature from MD-simulation and other multiparametric drug-ability profiles suggest that karanjin could be considered as a suitable therapeutic lead for AD and PD treatment. Furthermore, the present results were strongly correlated with the earlier study on karanjin in an Alzheimer’s animal model. However, necessary in vivo studies, clinical trials, bioavailability, permeability and safe dose administration, etc. must be required to use karanjin as a potential drug against AD and PD treatment, where the in silico results are more helpful to accelerate the drug development. 相似文献
238.
Dr. Gourishetty Srikanth Dr. Anil Ravi Dr. Anusha Sebastian Jobi Joseph Prof. Monther A. Khanfar Prof. Mohammed I. El-Gamal Prof. Raed A. Al-Qawasmeh Prof. Imad A. Abu-Yousef Prof. Amin F. Majdalawieh Prof. Taleb H. Al-Tel 《European journal of organic chemistry》2023,26(9):e202201354
Azepino[3,4,5-cd]indole derivatives represent the core scaffold of important natural products and biologically relevant compounds. Therefore, the establishment of step- and atom-economic strategies to access this class of compounds is of paramount importance. To this end, complexity-to-diversity (CtD) strategy has become one of the most important tools that transforms complex molecules into diverse skeleta. However, many of the reactions that could be employed in CtD are restricted by the functional handles exist in these molecules. This limits the achievement of the desired skeletal diversity. Herein, an efficient and step-economic strategy to access a diverse collection of azepino-[3,4,5-cd]indole architectures through a cascade that combines Pictet-Spengler with Michael addition, is described. This was achieved by reacting cyclohexadienone acetaldehydes 2 a – 2 d with indolyl-4-ethyl amine 1 . Employing a CtD strategy on the developed azepino-[3,4,5-cd]indoles, a rapid rearrangement reaction that provided a modular, chemo- and diastereoselective access to diverse collection of spiro azepinocarbazole nature-inspired frameworks, was encountered. 相似文献