Indian Institute of Technology, Jodhpur

About: Indian Institute of Technology, Jodhpur is a education organization based out in Jodhpur, India. It is known for research contribution in the topics: Computer science & Welding. The organization has 914 authors who have published 2221 publications receiving 19243 citations.

A novel method for suppression of motion artifacts from the seismocardiogram signal

Abstract: Seismocardiography (SCG) measures the precordial vibrations using a sensor called accelerometer, which is of small size and low weight. These features support better attachment of it to the subject's body and hence get less affected by the slow motion of the subject. However, noise generated due to the footsteps, while walking, contaminates the SCG signal. Therefore, in this paper, a novel method is proposed to remove these contaminations from the SCG signal. A three-axis accelerometer was attached to the chest wall such that heart sound components are reflected in the z-axis while the motion noise due to footstep will be seen in the x-axis. To remove the noise components from the heart signal (z-axis), the location of footsteps from the x-axis are identified and the corresponding components from the z-axis are removed. After noise removal fundamental heart sounds (FHS), S1 and S2, are identified using Otsu's threshold method. The obtained results show that the proposed algorithm outperforms the state-of-the-art methods. It efficiently removes most of the contamination due to footsteps and identifies the heart sound components.

Entanglement generation in spatially separated systems using quantum walk

Abstract: We present a novel scheme to generate entanglement between two spatially separated systems. The scheme makes use of spatial entanglement generated by a single-particle quantum walk which is used to entangle two spatially separated, not necessarily correlated, systems. This scheme can be used to entangle any two systems which can interact with the spatial modes entangled during the quantum walk evolution. A notable feature is that we can control the quantum walk dynamics and its ability to localize leads to a substantial control and improvement in the entanglement output.

Chemical insights into electrophilic fluorination of SnO2 for photoelectrochemical applications

Abstract: Recently, there has been substantial interest in the fluorination of nanomaterials-based thin films used in various optoelectronic devices for optimum charge transport across semiconducting layers. The discovery of electrophilic fluorinating agents such as Selectfluor® (F-TEDA) has led to the development of novel methods for fluorination of metal oxides such as tin oxide (SnO2) in this work. Herein, we elucidate the fluorination of SnO2 thin films using X-ray photoelectron spectroscopy (XPS) depth profiling. The interaction of the F-TEDA molecule with the SnO2 surface occurs via N–F bonds. Fluorine is found to occupy interstices and substitutional sites in the SnO2 lattice. The interstitial fluorine (1.21 at%) decays off by a depth of 61 nm in the SnO2 film. The substitutional fluorine (1.28 at%) in SnO2 results in remarkable changes in its electronic structure due to the lowering of oxygen defects by ∼80%. The electrical properties of the F–SnO2 film is examined by impedance spectroscopy analysis. F–SnO2 exhibits an increase in electrical conductivity by ∼1–2 orders of magnitude and an increase in electron density by ∼65%, making it suitable as a charge transport layer in photoelectrochemical cells (PECs). The PEC in aqueous medium at neutral pH with F–SnO2 as the charge transport layer shows ∼81% increase in the photocurrent density (at 1.6 V versus RHE) and decrease in charge transfer resistance by ∼36%. Thus, the efficient transport of photogenerated charge carriers is observed in PECs with minimal recombination losses for the fluorinated SnO2 films. This study helps in understanding the role of defect passivation via single-step fluorination of metal-oxide for charge transport layers which can be extended to perovskite solar cells in the future.

Surface-directed spinodal decomposition on chemically patterned substrates.

Abstract: Surface-directed spinodal decomposition (SDSD) is the kinetic interplay of phase separation and wetting at a surface This process is of great scientific and technological importance In this paper, we report results from a numerical study of SDSD on a chemically patterned substrate We consider simple surface patterns for our simulations, but most of the results apply for arbitrary patterns In layers near the surface, we observe a dynamical crossover from a surface-registry regime to a phase-separation regime We study this crossover using layerwise correlation functions and structure factors and domain length scales