Full-text resources of PSJD and other databases are now available in the new Library of Science.
Visit https://bibliotekanauki.pl
Preferences help
Polish version English version Language
enabled [disable] Abstract
Number of results

Results found: 4

Number of results on page
first rewind previous Page / 1 next fast forward last

Search results

help Sort By:

help Limit search:
first rewind previous Page / 1 next fast forward last
1

Fertility improvement in pea (Pisum sativum L.) autotetraploids - mutation breeding

100%
Kumar H., Mercykuty V. C., Srivastava C. P.
Journal of Applied Genetics
|
1995
|
vol. 36
|
issue 1
43-48
EN
C2 seeds of autotetraploids (colchicine-induced) of two diverse genotypes, T 163 and 5064-S, of pea (Pisum sativum L.) and their corresponding diploids were irradiated with 10 kR gamma-ray.Autotetraploids showed high seed-sterility as compared to diploids.Seed fertility increased in M2 as compared to M1.Both quadrivalent and bivalent frequancies desreased in the M1 generation of autotetraploids in relation to their respective controls.However, a positive shift in the mean bivalent formation was noted at the cost of other configurations in C3-M2 with respect to C2-M1 and varied with the genotype.In the M2 generation of autotetraploic, the variability was relatively higher for the number of pods per plnt and seed yield per plant.Although the mean values for pods per plant, number of seeds per plant and seed yield per plant remained more or less parallel in autotetraloids in M1 and M2 generations, there was an increase in the upper range limit probably due to micromutation for these characters in M2.
2
Content available remote

Dynamics of Shallow Water Waves with Various Boussinesq Equations

100%
Kumar H., Malik A., Singh Gautam M., Chand F.
Acta Physica Polonica A
|
2017
|
vol. 131
|
issue 2
275-282
EN
Attempt has been made to construct the solitary waves and shock wave solutions or domain walls (in higher dimension) for various Boussinesq equations. The method of undetermined coefficients have been used to explore the exact analytical solitary waves and shock wave solutions in terms of bell-shaped sech^p function and kink-shaped tanh^p function for the considered equations. The Boussinesq equation in the (1+1)-dimensional, the (2+1)-dimensional and the (3+1)-dimensional equations are studied and the parametric constraint conditions and uniqueness in view of both solitary waves and shock wave solutions are determined. Such solutions can be valuable and desirable for explaining some nonlinear physical phenomena in nonlinear science described by the Boussinesq equations. The effect of the varying parameters on the development of solitary waves and shock wave solutions have been demonstrated by direct numerical simulation technique.
3
Content available remote

Eight-Channel Optical Add Drop Multiplexer Based on Ring Resonator Using LNOI Channel Waveguides

76%
Kumar H., Janyani V., Buryy O., Ubizskii S., Sugak D., Singh G.
Acta Physica Polonica A
|
2018
|
vol. 133
|
issue 4
997-999
EN
In this paper we report on an eight-channel optical add drop multiplexer based on ring resonator using lithium niobate on insulator channel waveguides. It is suitable for a DWDM-GPON network with channel spacing of 100 GHz in C-band and data rate is 10 Gbps. The insertion loss at the drop port is maximum 1.2 dB and the Q-factor is 1636. It can be used as multiplexer as well as demultiplexer in 8-channel DWDM systems.
4
Content available remote

Optical Investigation of the Cu Ions Diffusion into Bulk Lithium Niobate

52%
Sugak D., Syvorotka I., Yakhnevych U., Buryy O., Martynyuk N., Ubizskii S., Zhydachevskyy Y., Suchocki A., Kumar H., Janyani V., Singh G.
Acta Physica Polonica A
|
2018
|
vol. 133
|
issue 4
965-972
EN
Spatial changes of optical properties of bulk LiNbO₃ crystal were investigated after annealing in CuO powder. The incorporation of copper ions into the crystal was confirmed by registration of additional absorption spectra that revealed formation of the absorption bands of both Cu⁺ (400 nm) and Cu²⁺ (1000 nm) ions. The changes of optical absorption caused by thermal treatment were registered along the direction of diffusion by the probe beam perpendicular to this direction. The anisotropy of diffusion was revealed. The maxima were observed on the depth dependences of additional absorption both for the wavelengths of 400 and 1000 nm for all main crystallographic directions. The concentrations of copper ions were calculated in accordance with the Smakula-Dexter formula. The X-ray diffraction study revealed reflexes which probably belong to CuNb₂O₆, CuNbO₃ and CuO. The halo was observed on these diffraction patterns that confirms the formation of the scattering centers (about 1 nm in diameter) in the near-surface region.
first rewind previous Page / 1 next fast forward last
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.