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Institution

Vikram Sarabhai Space Centre

FacilityThiruvananthapuram, India
About: Vikram Sarabhai Space Centre is a facility organization based out in Thiruvananthapuram, India. It is known for research contribution in the topics: Aerosol & Ultimate tensile strength. The organization has 2092 authors who have published 3058 publications receiving 47975 citations. The organization is also known as: VSSC.


Papers
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Journal ArticleDOI
TL;DR: In this paper, a non-singular analytical theory for the motion of near-Earth satellite orbits with air drag is developed in terms of KS elements, utilizing a model of the atmosphere that allows for oblateness and in which the density behaviour approximates to the observed diurnal variation.
Abstract: A non‐singular analytical theory for the motion of near‐Earth satellite orbits with air drag is developed in terms of KS elements, utilizing a model of the atmosphere that allows for oblateness and in which the density behaviour approximates to the observed diurnal variation. The series expansions include up to cubic terms in e (eccentricity) and c (a small parameter dependent on the flattening of the atmosphere). Only two of the nine equations are solved analytically to compute the state vector at the end of each revolution due to symmetry in the KS element equations. Numerical comparisons between the analytical and numerically integrated values of the drag perturbed orbital parameters (semi‐major axis, eccentricity and argument of perigee) are made up to 100 revolutions for the test cases with different inclinations, over a range of perigee and apogee heights, which experience significant diurnal bulge effects. The comparisons are found to be good. The accuracies of the numerical computations are checked with the bilinear relation in KS elements, and are found to be very satisfactory.

19 citations

Journal ArticleDOI
TL;DR: In this article, the effect of mechanical milling of gas-atomized powders on mechanical properties of the hot-pressed and subsequently hot-rolled Cu-8-at% Cr-4 -nb alloy with a microstructure consisting of pure copper matrix hardened by intermetallic Cr 2 Nb precipitates was investigated.

19 citations

Journal ArticleDOI
TL;DR: In this paper, the authors presented the coordinate systems; coordinate transformations and equations of motion useful for the design and analysis of satellite separation system using the helical compression spring mechanism using the fourth-order Runge-Kutta method.

19 citations

Journal ArticleDOI
TL;DR: Insight is provided into how various power reduction techniques can be used and orchestrated such that satisfactory performance can be achieved for a given energy budget.

19 citations

Journal ArticleDOI
TL;DR: In this paper, 3-mercaptopropylsulfonate (MPS) stabilized ultrasmall NiO nanoclusters modified with conical Ni(II)-SR staples.
Abstract: Herein, we report 3-mercaptopropylsulfonate (MPS) stabilized ultrasmall NiO nanoclusters modified with conical Ni(II)-SR staples (NiO@Ni(II)-SR NCs). The surface tuning of MPS (-SR) staples over NiO NCs by varying metal to ligand (M–L) ratio resulted in the size-dependent supercapacitor behaviors. The formation of NiO@Ni(II)-SR NCs was ligand-specific with trace amounts of NaOH in the absence of NaBH4, wherein similar attempts with glutathione (GS) were unsuccessful. Atomic force microscopic (AFM) studies have confirmed the decreasing trend in the sizes of ultrasmall NiO@Ni(II)-SR NCs from ∼10 nm to ∼2 nm on increasing the M–L ratio and that of NiO nanoparticles synthesized with NaBH4i.e. the sizes of the NiO@Ni nanoparticles were found to be much greater (∼250 nm). High resolution scanning electron microscopy (HRSEM) images suggested the presence of lesser NiO aggregates in NiO@Ni(II)-SR NCs than NiO@Ni. X-ray diffraction studies confirm the amorphous nature of the ultrasmall NiO@Ni(II)SR NCs than NiO@Ni nanoparticles. Raman peaks around 510, 740 and 1090 cm−1 validate the presence of Ni–O vibrations, which get intensified with laser exposure, and peaks at 141, 242, 255, 285, 343 cm−1 suggest Ni–S vibrational modes indicating the formation of Ni(II)-SR staples over the core NiO nanoclusters. The specific capacitance (Sc) for NiO@Ni(II)-SR NCs is ∼449 F g−1, which is higher than that of NiO@Ni at 5 mV s−1 by CV analyses. The charge–discharge studies observed a maximum Csp of ∼512 F g−1 at a current density of 1 A g−1, and the cyclic stability for 1000 cycles retained ∼82% of its initial Csp for NiO@Ni(II)-SR NCs.

19 citations


Authors

Showing all 2111 results

NameH-indexPapersCitations
M. Santosh103134449846
Sabu Thomas102155451366
S. Suresh Babu7049817113
K. Krishna Moorthy542639749
Sathianeson Satheesh5317211099
M. Y. Hussaini4920716794
J.R. Banerjee441465620
C. P. Reghunadhan Nair371814825
K. N. Ninan361594156
Anil Bhardwaj352304527
Ivatury S. Raju331216626
Venkata Sai Kiran Chakravadhanula321023011
P.K. Sinha321182918
J.-P. St.-Maurice311133446
Subramaniam Gopalakrishnan281232951
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
202313
202230
2021186
2020160
2019149
2018136