University of Rajasthan

About: University of Rajasthan is a education organization based out in Jaipur, India. It is known for research contribution in the topics: Chemical shift & Derivative (chemistry). The organization has 15058 authors who have published 15733 publications receiving 117400 citations. The organization is also known as: Rajasthan University.

Ion-acoustic compressive and rarefactive double layers in a warm multicomponent plasma with negative ions

Abstract: Propagation of ion-acoustic double layers has been studied in plasma consisting of warm positive- and negative-ion species with different masses, concentrations, and charge states along with electrons with two-electron temperature distributions. It is found that there exist two critical concentrations of negative ions, ${\ensuremath{\alpha}}_{R}$ and ${\ensuremath{\alpha}}_{Q}.$ One of them $({\ensuremath{\alpha}}_{R})$ generally decides the existence of the double layer, whereas the other one $({\ensuremath{\alpha}}_{Q})$ decides the nature of the double layer. It is found that the system supports ion-acoustic double layers only when the negative-ion concentration (\ensuremath{\alpha}) is greater than the critical concentration ${\ensuremath{\alpha}}_{R}.$ It is also found that below the critical concentration ${\ensuremath{\alpha}}_{Q},$ compressive double layers exist and above it rarefactive double layers exist. For some values of cold-electron concentrations (\ensuremath{\mu}) it is found that if the temperature of the negative-ion species is higher than the positive-ion species, then the system supports compressive double layers for all values of \ensuremath{\alpha} lying in the range $0l\ensuremath{\alpha}l{\ensuremath{\alpha}}_{Q}.$ The dependence of the critical concentrations on the temperatures of the two-ion species and on the concentration of cold electrons has also been investigated.

Analysis and Dynamics of Fractional Order Covid-19 Model with Memory Effect

Abstract: The present article attempts to examine fractional order Covid-19 model by employing an efficient and powerful analytical scheme termed as q-homotopy analysis Sumudu transform method (q-HASTM). The q-HASTM is the hybrid scheme based on q-HAM and Sumudu transform technique. Liouville-Caputo approach of the fractional operator has been employed. The proposed modelis also examined numerically via generalized Adams-Bashforth-Moulton method. We determined model equilibria and also give their stability analysis by employing next generation matrix and fractional Routh-Hurwitz stability criterion.

Prevention of gamma radiation induced anaemia in mice by diltiazem

Abstract: Intraperitoneal administration of diltiazem (DTZ), half an hour prior to whole body gamma irradiation (2.5, 5.0, & 7.5 Gy), showed the protection of animals from radiation-induced anaemia. Radiation exposure significantly (p < 0.001) reduced the number of pro- and normoblasts in bone marrow and RBC counts, hemoglobin (Hb), hematocrit (Hct ), and erythropoietin (EPO) level in blood, but increased myeloid / erythroid ratio. At all the radiation doses, the maximum decrease in these values was noted on the 3rd day, followed by a gradual recovery from the 7th day, but it was not recorded as normal even until the end of experimentation. In animals pretreated with DTZ, these values were measured higher at all the time periods in comparison to corresponding control, and these were almost normal at the last autopsy interval only at 2.5 Gy radiation dose. DTZ maintained the higher erythropoietin level in blood, which acted on bone marrow and spleen colony forming unit for erythroblast (CFU-E), and stimulated such cells to produce RBCs. These results confirm that DTZ has the potency to alter anaemic condition favorably through the protection of bone marrow stem cells, and subsequently it maintains the higher number of pro- and normoblasts in bone marrow, RBC counts, hemoglobin (Hb), hematocrit (Hct) percentage, and erythropoietin level in blood and the lower myeloid/erythroid ratio in bone marrow.