Evolution of Hindu Temples in Calcutta

Traditional norms of temple buildings, especially the form and location of Hindu temples, were meticulously standardized by Sanskrit texts to conform with a basic idea that a temple is the personal dwelling place of a deity.

This study, using a historical comparison method, presents tangible exndence of changes in the form and location of Calcutta's temples and the erosion of the old ideology within the urban milieu. A classification of temples according to their organizational characteristics provides insight into the nature of their changes, their cause and implications.     

Anomalous fading and crystalline structure: Studies on individual chondrules from the same parent body

Plagioclase feldspar is the major luminescent mineral in meteorites. Thermoluminescence (TL) characteristics, peak temperature (T_m), full width at half maximum (FWHM), ratio of high (HT) to low temperature (LT) peak, and TL sensitivity (TL/dose/mass) to an extent reflect degree of crystallinity of the mineral. The present study explores and establishes a correlation between quantum mechanical anomalous (athermal) fading and structural state by examining TL of individual chondrules. Chondrules were separated using freeze-thaw technique from a single fragment of Dhajala meteorite. The results show large variation in T_m (155?230°C), FWHM (80?210°C) and HT/LT (0.07–0.47) and seem to be positively correlated. TL sensitivity (ranging from 14 to 554 counts/s/Gy/mg) decreases with increasing T_m and FWHM. Large variations in TL parameters (Tm, FWHM, HT/LT, and Sensitivty) suggest that individual chondrules had different degree of crystallization. Thermal annealing experiments suggest that comparatively ordered form of feldspar can be converted to a disordered form by annealing the sample at high temperatures (1000°C) for long time (10 hr) in vacuum (1 mbar pressure) condition and rapidly cooling it. Measured anomalous fading suggest that fading rate increases as the crystal form changes from an ordered state to a disordered state. However, the fading rate becomes nearly negligible for the most disordered feldspars.     

Aspects of Infrared Radioluminescence dosimetry in K-feldspar

Infrared radioluminescence (IRRL) of K-feldspar, detected at peak wavelength of 865 nm, is emerging as a potential geochronometric tool. The present study explores and attempts to optimize the IRRL dating protocols and proposes a revised protocol for estimation of palaeodose. UV light (395 nm; 700 mW/cm2) bleach of 800 s was optimum to remove the trapped charges responsible for IRRL and, reduced the interference of radio-phosphorescence due to prior irradiations. Validation of the proposed protocol was carried out by dose recovery tests on mineral and sediment K-feldspar samples of different provenances. An overestimation in dose recovery was observed and was attributed to difference in sensitivity of natural IRRL and regenerated IRRL. The sensitivity changes were significant and systematic and were documented by repeating bleach-IRRL cycles. Corrections for sensitivity changes between natural and regenerated IRRL, gave reliable results and, have now been included in the proposed dating protocol.     

(Re)imagining the idea of India: Contestations about Hindutva among the Indian American diaspora

This paper explores the motivations and actions of Indian Americans who actively oppose Hindutva, that is, a Hindu nationalist vision for India. Diaspora activists who advocate in favour of progressive values for India tend to be underreported in the media and underanalysed in scholarship. The following study addresses this gap. Based on public records, interviews with activist leaders, and participant-observation, the paper demonstrates how anti-Hindutva diaspora actors identify and leverage political opportunities in order to engage in moral signalling in local, national and global spaces. By shining a light on ongoing counternarratives to Hindutva, this study highlights contestations within Indian-origin communities and challenges monolithic portrayals of diaspora politics.