Oscillating neutrinos: theory vs experiment

Possible hints on neutrino masses are reviewed. They come from the deficits in the solar as well as atmospheric neutrinos and from need of a significant amount of hot component in the dark matter of the universe. The role of three generation mixing in simultaneously solving the solar and atmospheric neutrino problem is discussed. All the three hints can be reconciled if three neutrinos are almost degenerate. Models for neutrino masses and mixing implied by the above hints are briefly discussed.     

Electrical conduction and diffusion studies in NH4H2PO4 and KH2PO4 single crystals

Electrical conduction (dc) studies are made with pure and cobalt(II)-doped single crystals of NH₄H₂PO₄ and KH₂PO₄. The effect of the dopant concentration on the enthalpy for the migration of protons and the enthalpy for the rotation of the H₂PO₄ group have been studied. It is suggested that proton migration occurs through a synchronous phosphate rotation mechanism. Tritium diffusion studies in KDP and ³²PO₄ diffusion in ADP crystals have been made. The mechanisms for the conduction and diffusion processes are found to be different in nature. The distribution coefficients of Co(II) dopant in ADP (2.92 × 10^?3) and KDP (1.14 × 10^?3) are calculated. The following enthalpy values are obtained.

     

113.

Application of <Emphasis Type="Italic">G</Emphasis>′/<Emphasis Type="Italic">G</Emphasis>-expansion method to Kuramoto-Sivashinsky equation     

Ghodrat Ebadi  Anjan Biswas 《应用数学学报(英文版)》2016,32(3):623-630

This paper obtains the solutions of the Kuramoto-Sivashinsky equation. The G′/G method is used to carry out the integration of this equation. Subsequently, its special case, will be integrated and topological 1-soliton solution will be obtained by the soliton ansatz method. The restrictions on the parameters and exponents are also identified.     

114.

Asymmetric hydrogenation of unsaturated ureas with the BIPI ligands     

Busacca CA  Lorenz JC  Grinberg N  Haddad N  Lee H  Li Z  Liang M  Reeves D  Saha A  Varsolona R  Senanayake CH 《Organic letters》2008,10(2):341-344

Asymmetric hydrogenation of unsaturated urea esters with the BIPI Ligands has been examined. Optimization of the P-N ligand structure has led to the development of chiral rhodium catalysts capable of producing the targets with >99% ee. The critical phosphine borane SNAr reaction needed for ligand synthesis has been optimized to give the adducts in high yield at ambient temperature with no racemization. An extremely concise, economical, and scalable sequence to these important new ligands for catalysis of asymmetric hydrogenation has been developed.     

115.

Photoinduced electron transfer reaction in polymer-surfactant aggregates: Photoinduced electron transfer between N,N-dimethylaniline and 7-amino coumarin dyes     

Chakraborty A  Seth D  Setua P  Sarkar N 《The Journal of chemical physics》2008,128(20):204510

Photoinduced electron transfer between coumarin dyes and N,N-dimethylaniline has been investigated by using steady state and picosecond time resolved fluorescence spectroscopy in sodium dodecyl sulphate (SDS) micelles and PVP-polyvinyl pyrrolidone (SDS) polymer-surfactant aggregates. A slower rate of electron transfer is observed in PVP-SDS aggregates than in polymer-free SDS micelles. A Marcus type inversion is observed in the correlation of free energy change in comparison with the electron transfer rate. The careful investigation reveals that C-151 deviates from the normal Marcus inverted region compared to its analogs C-152 and C-481 due to slower rotational relaxation and smaller translational diffusion coefficient.     

116.

Stochastic perturbation of Kerr law optical solitons     

Anjan Biswas 《Optical and Quantum Electronics》2005,37(4):359-369

The soliton perturbation theory is used to study and analyze the stochastic perturbation of optical solitons, due to Kerr law nonlinearity, in addition to deterministic perturbations of optical solitons that is governed by the nonlinear Schrödingers equation. The Langevin equations are derived and analyzed. The deterministic perturbations that are considered here are of both Hamiltonian as well as of non-Hamiltonian type.     

117.

Quasi-Linear Pulses in Multiple Channels     

Anjan?BiswasEmail author 《Optical and Quantum Electronics》2005,37(9):813-834

The evolution of quasilinear optical pulses in multiple channels, with strong dispersion-management, is studied analytically. The nonlinear terms of the Gabitov-Turitsyn equations are analysed asymptotically. The total spectral intensity, for a lossless system, is found to be an invariant of propagation, while for a lossy system it is dependent on the relative position of the amplifier in the dispersion map.     

118.

Study of energy transfer from 7-amino coumarin donors to the rhodamine 6G acceptor in lecithin vesicles and sodium taurocholate-lecithin mixed aggregates     

Seth D  Chakraborty A  Setua P  Chakrabarty D  Sarkar N 《The journal of physical chemistry. B》2005,109(24):12080-12085

The energy transfer using 7-amino coumarin dyes as the donor and rhodamine 590 (Rh6G) as the acceptor was investigated in lecithin vesicles and sodium taurocholate (NaTC)-lecithin mixed aggregates using steady-state and time-resolved fluorescence spectroscopy. All energy transfer parameters were calculated. The coumarin 153-Rh6G pair is the most efficient donor-acceptor pair as reflected by the value of k(ET). With addition of NaTC in lecithin, in the case of the coumarin 153-Rh6G pair, the energy transfer rate or efficiency does not change very much, whereas in the case of the coumarin 151-Rh6G pair, the energy transfer rate decreases 2-fold upon going from lecithin vesicles to NaTC-lecithin mixed aggregates where the molar ratio is 2.5. It is mainly due to the deeper location of coumarin 153 in the lipid bilayer or in mixed aggregates. Rotational relaxation data also support this idea.     

119.

Investigation of energy band gap and its correlation with vacancy defects in Pb1-xNixO nanoparticles synthesized through sol-gel method     

Ali  Sk Irsad  Das  Anjan  Dutta  Dhanadeep  Das  Ajit  Mahata  Nagendranath  Mandal  Samiran  Mandal  Atis Chandra 《Journal of Sol-Gel Science and Technology》2021,100(1):89-100

Journal of Sol-Gel Science and Technology - Nickel doped lead oxide (Pb1-xNixO) nanoparticles with different concentration (x = 0.00, 0.01, 0.05, 0.10, 0.15, 0.20, 0.25, and 0.30) of...     

120.

Site‐selective synthesis and characterization of BODIPY–acetylene copolymers and their transistor properties          下载免费PDF全文

Anjan Bedi  Kothandam Krishnamoorthy  Sanjio S. Zade 《Journal of polymer science. Part A, Polymer chemistry》2016,54(13):1978-1986

To study the effect of site‐selective copolymerization of borondipyrromethene (BODIPY) with acetylene on the structural and optoelectronic properties, three copolymers P1–P3 were synthesized by the Sonogashira cross‐coupling of BODIPY units with diacetylene and bromine capping through all the possible linkages: α‐α ( P1 ), α‐β ( P2 ), and β‐β ( P3 ). The optoelectronic properties of the polymers were investigated systematically to understand the effect of site‐selective polymerization. The HOMO levels of the polymers were significantly tuned from P1 to P3 with negligible change in the LUMO levels. Broadening of absorption spectra from P3 to P1 was observed because of increase in the extent of conjugation. Additionally, the charge transport properties of these polymers in organic thin‐film transistors (OTFTs) revealed that P1 and P3 exhibited only p‐type mobility, whereas P2 exhibited electron mobility. Notably, the further investigations of the surface morphology of polymer films by atomic force microscopy (AFM) unveiled that comb like nanostructural arrangements in P3 was beneficial for the charge‐carrier mobility over the circular arrangements in P1 and P2 . © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2016 , 54, 1978–1986     

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	KDP (eV)	ADP (eV)
Enthalpy for the migration of protons	0.01 ± 0.01	0.15 ± 0.02
Enthalpy for the rotation of phosphate group	0.71 ± 0.01	0.66 ± 0.01
Enthalpy for T-diffusion	0.14 ± 0.01	—
Enthalpy for 32PO4 diffusion	—	0.24 ± 0.01

Application of <Emphasis Type="Italic">G</Emphasis>′/<Emphasis Type="Italic">G</Emphasis>-expansion method to Kuramoto-Sivashinsky equation

This paper obtains the solutions of the Kuramoto-Sivashinsky equation. The G′/G method is used to carry out the integration of this equation. Subsequently, its special case, will be integrated and topological 1-soliton solution will be obtained by the soliton ansatz method. The restrictions on the parameters and exponents are also identified.     

Asymmetric hydrogenation of unsaturated ureas with the BIPI ligands

Asymmetric hydrogenation of unsaturated urea esters with the BIPI Ligands has been examined. Optimization of the P-N ligand structure has led to the development of chiral rhodium catalysts capable of producing the targets with >99% ee. The critical phosphine borane SNAr reaction needed for ligand synthesis has been optimized to give the adducts in high yield at ambient temperature with no racemization. An extremely concise, economical, and scalable sequence to these important new ligands for catalysis of asymmetric hydrogenation has been developed.     

Photoinduced electron transfer reaction in polymer-surfactant aggregates: Photoinduced electron transfer between N,N-dimethylaniline and 7-amino coumarin dyes

Photoinduced electron transfer between coumarin dyes and N,N-dimethylaniline has been investigated by using steady state and picosecond time resolved fluorescence spectroscopy in sodium dodecyl sulphate (SDS) micelles and PVP-polyvinyl pyrrolidone (SDS) polymer-surfactant aggregates. A slower rate of electron transfer is observed in PVP-SDS aggregates than in polymer-free SDS micelles. A Marcus type inversion is observed in the correlation of free energy change in comparison with the electron transfer rate. The careful investigation reveals that C-151 deviates from the normal Marcus inverted region compared to its analogs C-152 and C-481 due to slower rotational relaxation and smaller translational diffusion coefficient.     

Stochastic perturbation of Kerr law optical solitons

The soliton perturbation theory is used to study and analyze the stochastic perturbation of optical solitons, due to Kerr law nonlinearity, in addition to deterministic perturbations of optical solitons that is governed by the nonlinear Schrödingers equation. The Langevin equations are derived and analyzed. The deterministic perturbations that are considered here are of both Hamiltonian as well as of non-Hamiltonian type.     

Quasi-Linear Pulses in Multiple Channels

The evolution of quasilinear optical pulses in multiple channels, with strong dispersion-management, is studied analytically. The nonlinear terms of the Gabitov-Turitsyn equations are analysed asymptotically. The total spectral intensity, for a lossless system, is found to be an invariant of propagation, while for a lossy system it is dependent on the relative position of the amplifier in the dispersion map.     

Study of energy transfer from 7-amino coumarin donors to the rhodamine 6G acceptor in lecithin vesicles and sodium taurocholate-lecithin mixed aggregates

The energy transfer using 7-amino coumarin dyes as the donor and rhodamine 590 (Rh6G) as the acceptor was investigated in lecithin vesicles and sodium taurocholate (NaTC)-lecithin mixed aggregates using steady-state and time-resolved fluorescence spectroscopy. All energy transfer parameters were calculated. The coumarin 153-Rh6G pair is the most efficient donor-acceptor pair as reflected by the value of k(ET). With addition of NaTC in lecithin, in the case of the coumarin 153-Rh6G pair, the energy transfer rate or efficiency does not change very much, whereas in the case of the coumarin 151-Rh6G pair, the energy transfer rate decreases 2-fold upon going from lecithin vesicles to NaTC-lecithin mixed aggregates where the molar ratio is 2.5. It is mainly due to the deeper location of coumarin 153 in the lipid bilayer or in mixed aggregates. Rotational relaxation data also support this idea.     

Investigation of energy band gap and its correlation with vacancy defects in Pb1-xNixO nanoparticles synthesized through sol-gel method

Journal of Sol-Gel Science and Technology - Nickel doped lead oxide (Pb1-xNixO) nanoparticles with different concentration (x = 0.00, 0.01, 0.05, 0.10, 0.15, 0.20, 0.25, and 0.30) of...     

Site‐selective synthesis and characterization of BODIPY–acetylene copolymers and their transistor properties

To study the effect of site‐selective copolymerization of borondipyrromethene (BODIPY) with acetylene on the structural and optoelectronic properties, three copolymers P1–P3 were synthesized by the Sonogashira cross‐coupling of BODIPY units with diacetylene and bromine capping through all the possible linkages: α‐α ( P1 ), α‐β ( P2 ), and β‐β ( P3 ). The optoelectronic properties of the polymers were investigated systematically to understand the effect of site‐selective polymerization. The HOMO levels of the polymers were significantly tuned from P1 to P3 with negligible change in the LUMO levels. Broadening of absorption spectra from P3 to P1 was observed because of increase in the extent of conjugation. Additionally, the charge transport properties of these polymers in organic thin‐film transistors (OTFTs) revealed that P1 and P3 exhibited only p‐type mobility, whereas P2 exhibited electron mobility. Notably, the further investigations of the surface morphology of polymer films by atomic force microscopy (AFM) unveiled that comb like nanostructural arrangements in P3 was beneficial for the charge‐carrier mobility over the circular arrangements in P1 and P2 . © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2016 , 54, 1978–1986