Treatment of highly contaminated composite tannery wastewater from common effluent treatment plant (CETP) was undertaken using indigenously developed ceramic microfiltration membranes. The had a high load organic and inorganic materials represented by about 5680 mg/L chemical oxygen demand (COD), 759 biochemical (BOD5) etc. current study proposed dual stage involving (MF) followed reverse osmosis (RO) compared to conventional process. final water fit for reuse in the tanning Organic loadings...

The 2011 outburst of the black hole candidate IGR J17091-3624 followed canonical track state transitions along with evolution Quasi-Periodic Oscillation (QPO) frequencies before it began exhibiting various variability classes similar to GRS 1915+105. We use this spectral and temporal properties determine mass J17091-3624, using three different methods, viz : Photon Index ($\Gamma$) - QPO frequency ($\nu$) correlation, Time (day) broadband modelling based on Two Component Advective Flow....

We present the results of Target Opportunity (ToO) observations made with AstroSat newly discovered black hole binary MAXI J1535-571. detect prominent C-type Quasi-periodic Oscillations (QPOs) frequencies varying from 1.85 Hz to 2.88 Hz, along distinct harmonics in all observations. note that while fundamental QPO is seen 3 - 50 keV energy band, harmonic not significant above ~ 35 keV. The were hard intermediate state, as state transitions observed by and Swift. attempt spectral modelling...

ABSTRACT We report the results of AstroSat observations GRS 1915+105 obtained using 100 ks Guaranteed Time during soft state. The colour–colour diagram indicates a variability class δ with detection high-frequency quasi-periodic oscillation (HFQPO) in power density spectra. HFQPO is seen to vary frequency range 67.96–70.62 Hz percentage rms ∼0.83–1.90 per cent and significance varying from 1.63 7.75. energy dependent spectra show that features are dominant only 6–25 keV band. broad-band...

ABSTRACT A comprehensive wideband spectral analysis of the brightest black hole X-ray binary 4U 1543−47 during its 2021 outburst is carried out for first time using NICER, NuSTAR, and AstroSat observations by phenomenological reflection modelling. The source attains a super-Eddington peak luminosity remains in soft state, with small fraction ($\lt 3{{\ \rm per\ cent}}$) inverse-Comptonized photons. modelling reveals steep photon index (Γ ∼ 2–2.6) relatively high inner disc temperature (Tin...

We present an in-depth spectral and timing analysis of the Black Hole binary 4U 1630-472 during 2016 2018 outbursts as observed by \textit{AstroSat} \textit{MAXI}. The extensive coverage with \textit{MAXI} is used to obtain Hardness Intensity Diagram (HID). source follows a `c'-shaped profile in agreement earlier findings. Based on HIDs previous outbursts, we attempt track evolution `super'-outburst `mini'-outbursts. model broadband energy spectra ($0.7-20.0$ keV) observations both using...

Objective— Coagulation factor VIIa (VIIa) binding to its cellular receptor, tissue (TF), not only initiates the coagulation cascade but also induces cell signaling by activating G-protein coupled protease-activated receptors. The objective of present study is investigate role lipid rafts and caveolae in modulating TF-VIIa coagulant functions. Methods Results— function was measured X activation assay evaluated phosphoinositide hydrolysis IL-8 gene induction. Buoyant density gradient...

We study the spectral and temporal characteristics of source GS 2023$+$338 (V404 Cyg) during initial phase its June 2015 outburst, over energy range 0.5 - 150 keV. This is first detailed this based on {\it SWIFT} observations, being reported. Based our analysis, we understand that existed in hard, intermediate soft states. find evolution parameters, hardness intensity diagram rms-intensity are not similar to those observed for most outbursting black hole sources. also observe presence weak...

The centrifugal barrier supported boundary layer (CENBOL) of a black hole affects the spectrum exactly in same way neutron star does. CENBOL is caused by standing or oscillating shock waves that accelerate electrons very efficiently and produce power-law distribution. accelerated particles turn emit synchrotron radiation presence magnetic field. We study spectral properties an accretion disk as function strength, compression ratio, flow rate geometry. In absence satisfactory description...

Two-component advective flows have Keplerian accretion disks on the equatorial plane that is surrounded by sub-Keplerian transonic flows. In this Letter, we study spectral properties of these when shocks are present. The shock acceleration produces nonthermal electrons in postshock region turn produce power-law synchrotron radiation. soft photons generated bremsstrahlung and processes flow, as well multicolor blackbody emission from disk, Comptonized thermal electrons. By varying rates, able...

We study the properties of two-temperature accretion flow around a non-rotating black hole in presence various dissipative processes where pseudo-Newtonian potential is adopted to mimic effect general relativity. The encounters energy loss by means radiative acted on electrons and at same time, heats up as consequence viscous heating effective ions. assumed that exposed with stochastic magnetic fields which leads Synchrotron emission these emissions are further strengthen Compton scattering....

We investigate a relativistic fluid jet driven by radiation from shocked accretion disc around non-rotating black hole approximated Paczy\'nski-Wiita potential. The sub-Keplerian and Keplerian rates control the shock location therefore, field disc. compute radiative moments with full special transformation. effect of fraction absorbed has been approximated, over above transformations. show that super massive are different compared to stellar mass hole. terminal speed jets increases...

We study the two-temperature magnetized advective accretion flow around Kerr black holes. During accretion, ions are heated up due to viscous dissipation, and when Coulomb coupling becomes effective, they transfer a part of their energy electrons. On contrary, electrons lose various radiative cooling processes, namely bremsstrahlung, synchrotron, Comtonization respectively. To account for magnetic contribution inside disc, we consider toroidal fields which assumed be dominant over other...

Spectra in outburst sources are found to become soft viscous timescales before going back hard as the pre-outburst phase. By using two component accretion disks we show that major characteristics of spectral evolution can be reproduced. We find is possibly caused by a sudden rise viscosity which gradually converts sub-Keplerian flow into Keplerian flow. The decline reduces rate, and system goes states. discuss genesis characteristic shape hardness–intensity diagram reproduce this for...

We study the spectral and temporal properties of MAXI J0637-430 during its 2019-2020 outburst using \textit{NICER}, \textit{AstroSat} \textit{Swift-XRT} data. The source was in a disc dominant state within day detection traces out `c' shaped profile HID, similar to `mini'-outbursts recurrent BHB 4U 1630-472. Energy spectrum is obtained $0.5-10$ keV band with \textit{NICER} \textit{Swift-XRT}, $0.5-25$ \textit{AstroSat}. spectra can be modelled multicolour emission (\textit{diskbb}) convolved...

We present a comprehensive spectral and temporal study of the black hole X-ray transient MAXI J1820+070 during its outbursts in 2018 using Swift/XRT, NICER, NuSTAR AstroSat observations. The Swift/XRT NICER shows plateau light curve with softening (hardness changes from $\sim$ $2.5$ to $2$) followed by gradual decline without first outburst. Also, modelling suggests that outburst is low/hard state throughout truncated disk whereas thermal emission dominates second During entire outburst,...

We investigate the role of radiative driving shock-ejected bipolar outflows from advective accretion discs in a self-consistent manner. Radiations inner disc affects subsonic part jet while those pre-shock supersonic part, and there by constitutes multistage acceleration process. show that radiation not only accelerate but also increase mass outflow rate, increases kinetic energy flow. With proper proportions these two radiations, very high terminal speed is possible. estimated post-shock...

We investigate the global structure of advection dominated accretion flow around a Schwarzschild black hole where disc is threaded by toroidal magnetic fields. consider synchrotron radiative process as an effective cooling mechanism active in flow. With this, we obtain transonic solutions exploring variety boundary conditions and dissipation parameters, namely rate (⁠|${\dot{m}}$|⁠) viscosity (αB). The fact that depending on initial steady state flows can possess centrifugally supported...

Low radio frequencies are favourable for the identification of emission from non-thermal processes such as synchrotron emission. The massive protostellar jet associated with IRAS 18162-2048 (also known HH80-81 system) has been imaged at low frequencies: 325, 610 and 1300 MHz, using Giant Metrewave Radio Telescope, India. This is first instance detection a frequencies. central region displays an elongated structure characteristic jet. In addition, Herbig-Haro objects HH80, HH81, HH80N, other...