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Sathish Kumar, Sarath Kumar,Jurado-Manriquez, Edwin Antonio,Kim, YunHo,Choi, Chunghyeon,Baluch, Abrar H.,Kim, Chun-Gon Elsevier 2018 COMPOSITE STRUCTURES -BARKING THEN OXFORD- Vol.188 No.-
<P><B>Abstract</B></P> <P>This paper deals with how the use of Polybenzimidazole (PBI) as a film coating over conventional composite designs could help improve the hypervelocity impact ballistic performance of the system. PBI coated composite samples were studied for resistance to Low Earth Orbit environment conditions like high vacuum, thermal cycling, Atomic Oxygen and Ultraviolet Radiation in a simulation facility. It was observed that the PBI coated composites reduced mass loss and surface erosion compared to the non-coated samples after LEO exposure. Hypervelocity impact experiments were conducted on the PBI coated composites for impact velocities between 2.5 to 3 km/s. The experiments showed that the PBI film coating significantly increased the energy absorption of the composite system. The effect of thickness increase as a result of the film application on energy absorption was also found to be negligible confirming the effectiveness of PBI coating as a hypervelocity shield.</P>
Out of plane mode conversion and manipulation of Surface Plasmon Polariton Waves
Kumar, M. Sathish,Piao, Xianji,Koo, Sukmo,Yu, Sunkyu,Park, Namkyoo The Optical Society 2010 Optics express Vol.18 No.9
<P>We propose a rigorous design method of structured gratings for out of plane mode conversion, line focusing and manipulation of Surface Plasmon Polariton (SPP) waves. Employing a blazed grating to incorporate the directionality of SPP launch, and at the same time controlling grating depth and chirp to account for the radiation loss and diffraction angle, it was possible to achieve high efficiency and flexible SPP to freespace mode conversion. Devices with advanced functionalities, such as balanced SPP power splitter, and SPP wavelength demultiplexer are demonstrated with over 75% of power efficiencies at reasonable working distances of less than several wavelengths.</P>
Sathish Kumar, Y.,Unnithan, A.R.,Sen, D.,Kim, C.S.,Lee, Y.S. Elsevier 2015 Colloids and surfaces. A, Physicochemical and engi Vol.477 No.-
Electrospinning is a fabrication process that uses an electric field to control the deposition of polymer fibers onto a target substrate. Nanofiber possess the characteristic features of high length-to-diameter ratio and specific surface areas, enabling it to be used for protective clothing, filter, antibacterial membrane, reinforced composite, and tissue engineering. We have adopted a method of direct in situ electrospinning to produce mats composed of the culture filtrate from low shear modeled microgravity (LSMMG) grown Penicillium chrysogenum with a suitable carrier polymer to aid in its electrospinning. The antibacterial activity of the mat is attributed to the presence of penicillin in the culture filtrate. The presence of penicillin was confirmed by using liquid chromatography-mass spectrometry (LC-MS/MS). The mat was found to be effective against gram positive bacteria like Staphylococcus aureus and Enterococcus faecalis. The process, stability and characterization of the biological properties of such nanofibrous scaffolds are demonstrated.
Pristine graphene-ink for 3D-printed flexible solid-state supercapacitor
Kumar Satendra,Goswami Manoj,Singh Netrapal,Soni Prachi,Sathish N.,Kumar Surender 한국탄소학회 2022 Carbon Letters Vol.32 No.4
Due to its capacity to manufacture low-cost 3D-printed structures, 3D-printing technology offers a unique opportunity for the fast epitome of various applications. Using a typical fused deposition modeling 3D printer along with a Discovery extruder, a graphene-ink can be 3D printed to produce an interdigitated electrode (IDE) arrangement. This work fabricated a 3D-printed planar supercapacitor from pristine graphene-ink without using high-temperature processing or functional additives. The printable ink (89%) is formulated from pristine graphene without the addition of any functional additives. The symmetric flexible supercapacitor is demonstrated with an excellent specific capacitance of 137.50 F/g at 0.5 A/g and an energy density of 12.23 Wh/kg. The obtained gravimetric energy density beats reported earlier carbon-based supercapacitors that are 3D or inkjet printed. The flexibility and robustness of 3D-printed devices are achieved up to 150° folding angles. This work demonstrates an efficient and easy method for fabricating practical energy storage devices featuring a customizable shape and excellent flexibility.
Approximation by Generalized Kantorovich Sampling Type Series
Kumar, Angamuthu Sathish,Devaraj, Ponnaian Department of Mathematics 2019 Kyungpook mathematical journal Vol.59 No.3
In the present article, we analyse the behaviour of a new family of Kantorovich type sampling operators $(K^{\varphi}_wf)_{w>0}$. First, we give a Voronovskaya type theorem for these Kantorovich generalized sampling series and a corresponding quantitative version in terms of the first order of modulus of continuity. Further, we study the order of approximation in $C({\mathbb{R}})$, the set of all uniformly continuous and bounded functions on ${\mathbb{R}}$ for the family $(K^{\varphi}_wf)_{w>0}$. Finally, we give some examples of kernels such as B-spline kernels and the Blackman-Harris kernel to which the theory can be applied.
Pattern of Reproductive Cancers in India
Takiar, Ramnath,Kumar, Sathish Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.2
Background: Reproductive cancers are those that affect the human organs that are involved in producing offspring. An attempt is made in the present communication to assess the magnitude and pattern of reproductive cancers, including their treatment modalities, in India. The cancer incidence data related to reproductive cancers collected by five population-based urban registries, namely Bangalore, Bhopal, Chennai, Delhi and Mumbai, for the years 2006-08 were utilized. The reproductive cancers among females constituted around 25% of the total and around 9% among males. Among females, the three major contributors were cervix (55.5%), ovary (26.1%) and corpus uteri (12.4%). Similarly among males, the three major contributors were prostate (77.6%), penis (11.6%) and testis (10.5%). For females, the AAR of reproductive cancers varied between 30.5 in the registry of Mumbai to 37.3 in the registry of Delhi. In males, it ranged between 6.5 in the registry of Bhopal to 14.7 in the registry of Delhi. For both males and females, the individual reproductive cancer sites showed increasing trends with age. The leading treatment provided was: radio-therapy in combination with chemo-therapy for cancers of cervix (48.3%) and vagina (43.9%); surgery in combination with chemo-therapy (54.9%) for ovarian cancer; and surgery in combination with radio-therapy for the cancers of the corpus uteri (39.8%). In males, the leading treatment provided was hormone-therapy for prostate cancer (39.6%), surgery for penile cancer (81.3%) and surgery in combination with chemo-therapy for cancer of the testis (57.6%).