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31.
Practical applications of integrated optics require understanding of light propagation in dielectric waveguides of various
geometries and calls for elegant and quick methods of analysis. In this paper, we use beam propagation method to analyse some
integrated optic waveguiding elements such as waveguide with bend and branching waveguide. The method is extended to cylindrical
co-ordinates, so that structures with circular symmetry can be easily solved. We first present a general beam propagation
method algorithm, followed by results taking typical values for various parameters. Our studies show that the efficiency of
the method depends on thez-propagation steps and on the number of points chosen for the Fourier transform. The algorithm developed can be used to analyse
many other integrated optic structures and to study the effect of other input beam profiles. 相似文献
32.
Barman Pubali Dwibedi Debasmita Jayanthi K. Meena Sher Singh Nagendran Supreeth Navrotsky Alexandra Barpanda Prabeer 《Journal of Solid State Electrochemistry》2022,26(9):1941-1950
Journal of Solid State Electrochemistry - In pursuit of high-energy density sodium insertion materials, polyanionic frameworks can be designed with tuneable high-voltage operation stemming from... 相似文献
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The time-dependent behavior of bulk polymer film and wire with polymer insulation is studied using indentation. The indenter
is displaced into the material at a constant rate and then held at a fixed indentation depth to monitor load relaxation. A
finite element simulation of the experiment is performed; this analysis is parameterized in terms of the unknown shear compliance
modeled as a Prony series. An optimization method is then presented to determine the unknown material parameters by minimizing
the RMS error between the model and the experimental data. The method is demonstrated with poly (vinyl chloride) (PVC) films
after thermal aging and pristine polyethylene sheet; excellent agreement between the model and the data is demonstrated. The
method is also demonstrated to successfully characterize the material properties for the compression of a wire with PVC insulation;
the resulting properties are then shown to adequately predict the crossed-cylinder indentation behavior of the same wire using
a 3D finite element model. The chief benefit of the method is that an analytical solution method is not required for its implementation;
as such, the optimization approach can be readily applied to the determination of material properties from arbitrarily complex
experimental geometries.
相似文献
R. D. Bradshaw (SEM member)Email: |
35.
A C 3-symmetric triphenylbenzene based photoluminescent compound, 1,3,5-tris(4′-(N-methylamino)phenyl) benzene ([NHMe]3TAPB), has been synthesized by mono-N-methylation of 1,3,5-tris(4′-aminophenyl) benzene (TAPB) and structurally characterized. [NHMe]3TAPB acts as a selective fluorescent sensor for picric acid (PA) with a detection limit as low as 2.25 ppm at a signal to noise ratio of 3. Other related analytes (i.e. TNT, DNT and DNB) show very little effect on the fluorescence intensity of [NHMe]3TAPB. The selectivity is triggered by proton transfer from picric acid to the fluorophore and ground-state complex formation between the protonated fluorophore and picrate anion through hydrogen bonding interactions. The fluorescence lifetime measurements reveal static nature of fluorescence quenching. 相似文献
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Pseudohalogenogermylenes versus Halogenogermylenes: Difference in their Complexation Behavior towards Group 6 Metal Carbonyls
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Mahendra Kumar Sharma Soumen Sinhababu Dhirendra Yadav Goutam Mukherjee Prof. Gopalan Rajaraman Prof. Selvarajan Nagendran 《化学:亚洲杂志》2018,13(10):1357-1365
Pseudohalogenogermylenes [(iBu)2ATI]GeY (Y=NCO 4 , NCS 5 ) show different coordination behavior towards group 6 metal carbonyls in comparison to the corresponding halogenogermylenes [(iBu)2ATI]GeX (X=F 1 , Cl 2 , Br 3 ) (ATI=aminotroponiminate). The reactions of compounds 4 – 5 and 1 – 3 with cis‐[M(CO)4(COD)] (M=Mo, W, COD=cyclooctadiene) gave trans‐germylene metal complexes {[(iBu)2ATI]GeY}2M(CO)4 (Y=NCO, M=Mo 6 , W 11 ; Y=NCS, M=Mo 7 ) and cis‐germylene metal complexes {[(iBu)2ATI]GeX}2M(CO)4 (M=Mo, X=F 8 , Cl 9 , Br 10 ; M=W, X=Cl 12 ), respectively. Theoretical studies on compounds 7 and 9 reveal that donor–acceptor interactions from Mo to Ge atoms are better stabilized in the observed trans and cis geometries than in the hypothetical cis and trans structures, respectively. 相似文献
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Santhisudha Sarva Jayaprakash Soora Harinath Siva Prasad Sthanikam Selvarajan Ethiraj Mohanasrinivasan Vaithiyalingam Suresh Reddy Cirandur 《中国化学快报》2016,27(1):16-20
A series of bioactive bis(indolyl)methanes are synthesized by one-pot green reaction of indole with various substituted aldehydes by microwave irradiation under solvent free conditions. The antibacterial activity against Staphylococcus aureus and anti-inflammatory activity of the synthesized bis(indolyl)-methanes are evaluated in vitro and compared to standard drugs tetracycline and diclofenac, respectively. The majority of the compounds showed good antibacterial and anti-inflammatory activity. Interestingly, compounds 3j, 3i, 3k and 3g exhibited much higher anti-inflammatory activity than the standard diclofenac drug and thus qualify for clinical trials to be used as an anti-inflammatory compound. 相似文献
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