https://cyberleninka.org/article/n/397759.pdf

Ethnobotany, ethnopharmacology and toxicity of Jatropha curcas L. (Euphorbiaceae): A review

Ethnomedicinal plants used to treat skin diseases by Tharu community of district Udham Singh Nagar, Uttarakhand, India

Ethnobotanical survey of Purulia district, West Bengal, India for medicinal plants used against gastrointestinal disorders.

A unique approach is described for widening the bandwidth of a helical antenna with improved gain, pattern, and axial ratio characteristics. The antenna may be described as a nonuniform or quasi-taper helix, which consists of a combination of uniform and tapered helix sections. Measured patterns, gain, axial ratio, and VSWR for various helical antenna configurations are presented and compared. It is shown that a nonuniform quasi-taper helix can provide an operating bandwidth twice that of a conventional uniform-diameter helix.

Broadband quasi-taper helical antennas

This monograph, the result of five years of research, presents a fully descriptive account of antennas and scatterers for a circularly polarized wave. The author presents the radiation characteristics of these antennas and scatterers with emphasis on their engineering aspects. Numerical examples treating a system consisting of wires and slots are described and thoroughly analyzed. The first chapter covers numerical methods and techniques for antenna analysis, followed by chapters describing the square spiral antenna, two-wire round spiral antenna, spiral antenna with two off-center sources, polarization diversity of Archimedian spiral antenna, helical antenna of endfire mode, helical antenna of backfire mode, conical helix antenna, and wire scatterer for a circularly polarized wave.

Helical and spiral antennas : a numerical approach

Magnetic field dependence of transport critical current density (Jc) of a polycrystalline YBCO superconductor in field cooled and zero field cooled cases have been studied experimentally. The measured Jc value when the sample was cooled in a field (FC) was always larger than that measured for a zero field cooled (ZFC) case in the same magnetic field. We also observe (i) a peak in the field dependence of the ratio of Jc in FC case to that of ZFC case and (ii) an anomalous rise in Jc in ZFC case with increasing field. These observations are explained as a signature of two types of regions (intergrain and intragrain) in sintered specimens.

Transport critical current density of polycrystalline YBCO in zero field cooled and field cooled states: a comparison

The state, Jharkhand, as the name suggests, is rich in biodiversity and their traditional usage. Birhore, a dwindling tribe of Jharkhand is the custodian of traditional botanical knowledge. Their day to day life is dependent solely on forest. Their ways of utilizing plants as food, medicine and for other house hold purposes are not only novel but scientific also. Because of various anthropogenic as well as natural reasons, the population of Birhores is declining rapidly. It is, therefore, urgent to document their knowledge. Conservation and proper management of local vegetation is required for sustainable existence of the tribe. The paper deals with the plants used by this tribe for various purposes.

http://nopr.niscair.res.in/bitstream/123456789/9775/1/IJTK%209%283%29%20467-470.pdf

Traditional botanical wisdom of Birhore tribes of Jharkhand

This letter explores geometrical optics-based raytracing in combination with modal analysis to realize an open cavity structure as an advanced variant of the resonant cavity antenna (RCA). Additional ray confinement has been ensured by determining accurate phase-locking conditions as demonstrated for the first time. Its combination with the analysis of the cavity mode has also been introduced to determine the optimum design parameters, achieving improved radiation properties. With respect to a reference RCA reported earlier, the proposed approach exhibits a remarkable improvement in gain by 4–9 dB, resulting in about 17 dBi peak value consistently over the full 18% matching bandwidth. This is resultant from an increase in aperture efficiency, typically from 27% to 74%. This is achieved without any compromise with the cross-polarization property. The sidelobe level improves over the band except in higher frequency in H-plane. The proposed concept is commercially viable, showing significantly advantageous features.

Geometrical Optics-Based Advanced Design of an Open Cavity Resonant Antenna

An innovative measurement methodology is developed and successfully implemented for a spot beam antenna and payload characterization of high-throughput satellites (HTSs) in a compact antenna test facility (CATF). With the developed measurement methodology, total measurement time and measurement setup duration are reduced by more than 70% with respect to conventional measurement techniques. The proposed methodology is successfully implemented in multiple spacecraft (SC) of the Indian Space Research Organisation (ISRO).

High-Throughput Satellite Characterization: Spot beam payload characterization of high-throughput satellites in a compact antenna test facility

A wideband ridged horn using printed circuit and substrate integrated waveguide (SIW) technologies has been explored in this letter. A stepped flaring has been introduced in E-plane by adding multiple substrate layers, which is further loaded by a pair of E-plane flared balanced ridges to increase its operating bandwidth. The proposed technique is free from the requirement of any chemical glue or adhesive. A conventional SIW-based H-plane flaring is used. This horn is found to operate over 70% impedance bandwidth showing a consistent three-dimensional symmetric broadside radiation with an 8.7–19 dBi peak gain.

Puneet Kumar Mishra

Papers

Transport critical current density of polycrystalline YBCO in zero field cooled and field cooled states: a comparison

Traditional botanical wisdom of Birhore tribes of Jharkhand

Geometrical Optics-Based Advanced Design of an Open Cavity Resonant Antenna

High-Throughput Satellite Characterization: Spot beam payload characterization of high-throughput satellites in a compact antenna test facility

Wideband Pyramidal Ridged Horn Design by SIW Technology