Evidence of isotropy at large-scale from polarizations of radio sources

We test the isotropy of radio polarization angle orientations with a robust and reliable dual frequency polarimetric survey of active galactic nuclei (AGN). We find that the polarization orientations are consistent with the assumption of isotropy for scales larger than or equal to $\sim 800$ Mpc. This provides further evidence of isotropy at large distance scales and is likely to impose strong constraints on some of the physical mechanisms that may be invoked to explain past observations of alignment of radio and optical polarizations at large distance scales.Comment: 6 pages, 9 figures, accepted for publication in Astronomy & Astrophysics (10/12/2018

Modeling and Analysis of Active Front-End Induction Motor Drive for Reactive Power Compensation

In this thesis, an active front end induction motor drive for reactive power compensation is analyzed. The classical vector control approach for high performance control of an induction motor drive is a well established industry standard today. The same idea of decoupled control is extended to the line-side PWM converter for achieving better dynamic performance. The system model is obtained using d-q rotating frame theory. The iqe component of line currents is used to control the reactive power. The idecomponent is used to control the dc-link voltage and also to supply active power required by the motor. A high gain feedback controller with input-output linearization is presented to remove coupling between iqe and ide currents. A load power feed-forward loop is added to the dc-link voltage controller for fast dynamic response. The drive performance is analyzed to define system specifications. The motor acceleration, deceleration, and variable power factor operation (reactive power compensation) of the active drive system are demonstrated. The motor load is varied from no load to full load in steps of 10% each. For each step the device currents, switching power loss, line harmonics, and dc-link ripples are plotted. This data is used to derive conclusions that define system specifications and also state operating limits. The control of the drive system is implemented in MATLAB-SIMULINK. The complete system hardware is implemented in commercially available simulation tool, PSIM. The two software packages are interlinked using an interface module

Weak Lensing Effect on CMB in the Presence of a Dipole Anisotropy

We investigate weak lensing effect on cosmic microwave background (CMB) in the presence of dipole anisotropy. The approach of flat-sky approximation is considered. We determine the functions $\sigma_0^2$ and $\sigma_2^2$ that appear in expressions of the lensed CMB power spectrum in the presence of a dipole anisotropy. We determine the correction to B-mode power spectrum which is found to be appreciable at low multipoles ($l$). However, the temperature and E-mode power spectrum are not altered significantly.Comment: 9 page

PATHOPHYSIOLOGY, MECHANISM AND MANAGEMENT OF OVERACTIVE BLADDER SYNDROME-A REVIEW

An overactive bladder (OAB) is a syndrome which causes an impulsive desire to pass the urine. This desire or urge may become difficult to control and eventually may lead to unintentional passage of urine. The marked increase in a number of patients who suffered with OAB feels very awkward and tries to isolate from societal-life. Such increase in a number of patients has drawn an attention of scientists to research on this area. The proper diagnosis and management of OAB can help the patient to get early relief and cure the symptoms. Looking at the rate of prevalence of OAB in patients, it is essential to understand the pathophysiology, available treatment and recent updates to direct the researchers for further investigation. This review article focuses on comprehensive information of normal bladder physiology, neural control, regulation of micturition, pathophysiology, and prevalence of overactive bladder. This article gives an information regarding diagnosis, different approaches for treatments and future perspective of OAB syndrome

A family business perspective on emergence and potential of mass retail industry in India

Mr. Birinder Singh Narula is a third generation member of the Darshan Singh (DS) family and is currently the Managing Director of Ebony Retail Holdings Private Limited. The DS family business started in 1940s and moved away from India in the 1960s when the family opted to try overseas ventures in construction building hospitals and roads among other things. They moved around in Iran, Iraq and Kuwait during the 1960s and then settled in Libya and stayed. They were one of the largest Indian construction companies in the 1980s.This was during 1995-96 when the organized retailing was started when they opened up with Ebony in Delhi