A unified approach to problems on guessing, source coding and encoding of tasks See

We study four problems namely, Campbell's source coding problem, Massey's guessing problem, Huieihel et al.'s memoryless guessing problem, and Bunte and Lapidoth's encoding of tasks problem. We observe a close relationship among these problems. In all these problems, the&#...

Univalent functions and area problems See

This thesis contains a survey of basic properties of univalent functions in the analytic function theory. Mostly we focuses on the class of univalent functions in the unit disk in which each of them has a Taylor’s series expansion with a specific normalized form. T...

Morphologically tailored CuO photocathode using aqueous solution technique for enhanced visible light driven water splitting See

Cupric oxide (CuO) nanostructures are grown on fluorine doped tin oxide (FTO) coated glass substrate using aqueous solution approach. The concentration of precursor’s solution has significant impact on morphology of CuO nanostructure. By varying concentration of precursor, the growth of two ...

Electrochemical supercapacitive performance of potentiostatically cathodic electrodeposited nanostructured MnO2 films See

Nanostructured MnO2 films were prepared via cathodic electrodeposition under potentiostatic condition. X-ray diffraction (XRD) analyses reveal that the deposited films possess the hexagonal phase of epsilon manganese dioxide (ε-MnO2). Fourier transform infrared (FTIR) spectroscopy studies also confirm the ...

Critical review on sputter-deposited Cu2ZnSnS4 (CZTS) based thin film photovoltaic technology focusing on device architecture and absorber quality on the solar cells performance See

Thin film photovoltaic Cu2ZnSnS4 (copper zinc tin sulfide or CZTS) is one of the most promising sustainable solar cell absorber material. The CZTS absorber layer containing earth-abundant materials such as copper, zinc, tin and sulfur can be an alternative to existing materials for ...

Stable and Efficient CuO Based Photocathode through Oxygen-Rich Composition and Au–Pd Nanostructure Incorporation for Solar-Hydrogen Production See

Abstract Image Enhancing stability against photocorrosion and improving photocurrent response are the main challenges toward the development of cupric oxide (CuO) based photocathodes for solar-driven hydrogen production. In this paper, stable and efficient CuO-photocathodes have been developed using ...

Influence of electrodeposition modes on the electrochemical performance of MnO2 films prepared using anionic MnO4− (Mn7+) precursor See

In this work, we report the comparative electrochemical performance of the nanostructured MnO2 films prepared via three different electrodeposition modes, namely, potentiostatic (PS), potentiodynamic (PD), and galvanostatic (GS), using anionic MnO4- (Mn7+) precursor. All the MnO2 films have been found...

A Unified Scalable Quasi-Ballistic Transport Model of GFET for Circuit Simulations See

A unified quasi-ballistic transport model is developed for single- and double-gate graphene field-effect transistors (GFETs) using the McKelvey flux theory approach. The proposed model is compact, scalable, and compatible for the simulation of I-V characteristics of GFET for all regions of d...

Transparent heat regulating (THR) materials and coatings for energy saving window applications: Impact of materials design, micro-structural, and interface quality on the THR performance See

This review highlights the development of energy saving transparent heat regulating (THR) materials and coating for energy saving window applications. Current state-of-the-art technologies including transparent heat reflecting mirror (THM), thermo-chromic (TC), transparent solar cells (TSC), and luminescent bas...

First detection at 5.5 and 9 GHz of the radio relics in bullet cluster with ATCA See

We present here results from observations at 5.5 and 9 GHz of the Bullet cluster 1E 0657–55.8 with the Australia Telescope Compact Array (ATCA). Our results show detection of diffuse emission in the cluster. Our findings are consistent with the previous observations by Shimwell...

The effects of the ionosphere on ground-based detection of the global 21 cm signal from the cosmic dawn and the dark ages See

Detection of the global H i 21 cm signal from the Cosmic Dawn and the Epoch of Reionization is the key science driver for several ongoing ground-based and future ground-/space-based experiments. The crucial spectral features in the global 21 cm signal (turning points) occur&#x...

‘Rings’ of diffuse radio emission surrounding the bullet cluster See

We present the discovery of ringlike diffuse radio emission structures in the peripheral regions of the Bullet cluster 1E 0657 − 55.8. Ring formations are spanning between 1–3 Mpc away from the center of the cluster, significantly further away from the two alread...

आईआईटी: एक करोड़ से बनेगा ऑडिटोरियम और लेक्चरर हॉल See

Probing Individual Sources during Reionization and Cosmic Dawn using Square Kilometre Array HI 21-cm Observations See

Detection of individual luminous sources during the reionization epoch and cosmic dawn through their signatures in the HI 21-cm signal is one of the direct approaches to probe the epoch. Here, we summarize our previous works on this and present preliminary results on the prosp...

Clusters of Galaxies and the Cosmic Web with Square Kilometre Array See

The intra-cluster and inter-galactic media that pervade the large scale structure of the Universe are known to be magnetized at sub-micro Gauss to micro Gauss levels and to contain cosmic rays. The acceleration of cosmic rays and their evolution along with that of magnetic fie...

Line-of-Sight Anisotropies in the Cosmic Dawn and Epoch of Reionization 21-cm Power Spectrum See

The line-of-sight direction in the redshifted 21-cm signal coming from the cosmic dawn and the epoch of reionization is quite unique in many ways compared to any other cosmological signal. Different unique effects, such as the evolution history of the signal, non-linear peculiar ve...

A Space-based Observational Strategy for Characterizing the First Stars and Galaxies Using the Redshifted 21 cm Global Spectrum See

The redshifted 21 cm monopole is expected to be a powerful probe of the epoch of the first stars and galaxies ($10\lt z\lt 35$). The global 21 cm signal is sensitive to the thermal and ionization state of hydrogen gas and thus provides a tracer of sources&#...

Effects of ionosphere and troposphere on sensitive radio observations from 70 MHz to 24 GHz See

Any electromagnetic signal coming from outside the Earth's atmosphere will get affected by the Ionosphere at centimeter and meter wavelengths while the same will get affected by the Troposphere between centimeter and millimeter wavelengths. In this work, we explore a uniform formalism&#x...

Relativistic inverse Compton scattering of photons from the early universe See

Electrons at relativistic speeds, difusing in magnetic felds, cause copious emission at radio frequencies in both clusters of galaxies and radio galaxies through non-thermal radiation emission called synchrotron. However, the total power radiated through this mechanism is ill constrained, ...