DESIGN OF ONCHIP LOW DROPOUT (LDO) REGULATOR FOR POWER MANAGEMENT APPLICATION

A low dropout regulator is proposed in this paper. The regulator is designed with classic five pack model to decrease the number of devices and make the design compact and also reduce the power consumption. The system is designed and simulated in cadence virtuoso environment under 180nm technology node. Three models of LDO is proposed in this paper, with all having same error amplifier but with small variations. The advantages and disadvantages of each model will be discussed in the paper. The LDOs have linear characteristic over a good input range. It has good transient response to load variation.Â

Association of atherogenic cardiac index and markers of oxidative stress in non-diabetic dyslipidemia stroke patients in a tertiary care hospital in Eastern India

Background: Stroke is a clinical syndrome consisting of rapidly developing clinical signs of focal or global disturbance of cerebral function. Antioxidants are exogenous or endogenous compounds acting by scavenging reactive oxygen species or their precursors, inhibiting reactive oxygen species formation and binding metal ions needed for the catalysis of its generation. Atherogenic index, a predictor of atherosclerosis, increases in dyslipidemia also shows a positive association with oxidative stress. Aims and Objectives: Our objective was to compare the lipid profile, the markers of lipid peroxidation (malonaldehyde and paraoxonase [PON]), and atherogenic index in non-diabetic stroke patients with healthy controls and to evaluate the correlation between the lipid parameters with markers of lipid peroxidation and atherogenic index in those patients. Materials and Methods: One hundred diagnosed stroke patients from the Neurology department were compared with 100 age-matched healthy controls. Estimation of lipid profile parameters was done by AutoAnalyzer using standardized kits. Estimation of serum malonaldehyde was done based on the principle of utilization of Thiobarbituric acid. Serum PON1 activity was estimated using paranitrophenyl acetate substrate. Results: Among the lipid profile parameters, high-density lipoprotein (HDL) was significantly lower (P<0.001) and low-density lipoprotein (LDL) was significantly higher among stroke patients. Serum malonaldehyde level was significantly increased and PON1 activity was significantly decreased in stroke patients in comparison to healthy individuals. A significant positive correlation between HDL and PON1 and a negative correlation between LDL and PON1 were found. Atherogenic index is negatively correlated with PON1. Conclusion: Low level of PON1 activity and an increased level of malonaldehyde were found in stroke patients indicating an imbalance between free radical generation and its scavenging action and also associated with more chance of atherosclerosis

Two unusual neuro-psychiatric manifestations of malaria in a tertiary care hospital: a review of literature

Malaria, a highly prevalent parasitic disease in tropical country, have some atypical neuro-psychiatric manifestations seen in both vivax and falciparum malaria. We are reporting two cases of unusual neuro-psychiatric manifestations of malaria admitted in our hospital, one with intralobar haemorrhage and other with atypical psychiatric features. The rarity of the presentation has been highlighted with possible pathogenesis discussed after literature review

Search for gravitational-lensing signatures in the full third observing run of the LIGO-Virgo network

Gravitational lensing by massive objects along the line of sight to the source causes distortions of gravitational wave-signals; such distortions may reveal information about fundamental physics, cosmology and astrophysics. In this work, we have extended the search for lensing signatures to all binary black hole events from the third observing run of the LIGO--Virgo network. We search for repeated signals from strong lensing by 1) performing targeted searches for subthreshold signals, 2) calculating the degree of overlap amongst the intrinsic parameters and sky location of pairs of signals, 3) comparing the similarities of the spectrograms amongst pairs of signals, and 4) performing dual-signal Bayesian analysis that takes into account selection effects and astrophysical knowledge. We also search for distortions to the gravitational waveform caused by 1) frequency-independent phase shifts in strongly lensed images, and 2) frequency-dependent modulation of the amplitude and phase due to point masses. None of these searches yields significant evidence for lensing. Finally, we use the non-detection of gravitational-wave lensing to constrain the lensing rate based on the latest merger-rate estimates and the fraction of dark matter composed of compact objects

Search for eccentric black hole coalescences during the third observing run of LIGO and Virgo

Despite the growing number of confident binary black hole coalescences observed through gravitational waves so far, the astrophysical origin of these binaries remains uncertain. Orbital eccentricity is one of the clearest tracers of binary formation channels. Identifying binary eccentricity, however, remains challenging due to the limited availability of gravitational waveforms that include effects of eccentricity. Here, we present observational results for a waveform-independent search sensitive to eccentric black hole coalescences, covering the third observing run (O3) of the LIGO and Virgo detectors. We identified no new high-significance candidates beyond those that were already identified with searches focusing on quasi-circular binaries. We determine the sensitivity of our search to high-mass (total mass M&gt;70 M⊙) binaries covering eccentricities up to 0.3 at 15 Hz orbital frequency, and use this to compare model predictions to search results. Assuming all detections are indeed quasi-circular, for our fiducial population model, we place an upper limit for the merger rate density of high-mass binaries with eccentricities 0&lt;e≤0.3 at 0.33 Gpc−3 yr−1 at 90\% confidence level

Ultralight vector dark matter search using data from the KAGRA O3GK run

Among the various candidates for dark matter (DM), ultralight vector DM can be probed by laser interferometric gravitational wave detectors through the measurement of oscillating length changes in the arm cavities. In this context, KAGRA has a unique feature due to differing compositions of its mirrors, enhancing the signal of vector DM in the length change in the auxiliary channels. Here we present the result of a search for U(1)B−L gauge boson DM using the KAGRA data from auxiliary length channels during the first joint observation run together with GEO600. By applying our search pipeline, which takes into account the stochastic nature of ultralight DM, upper bounds on the coupling strength between the U(1)B−L gauge boson and ordinary matter are obtained for a range of DM masses. While our constraints are less stringent than those derived from previous experiments, this study demonstrates the applicability of our method to the lower-mass vector DM search, which is made difficult in this measurement by the short observation time compared to the auto-correlation time scale of DM

Quadriparesis due to Gitelman′s syndrome diagnosed with thiazide diuretic test response

Gitelman′s syndrome is characterized by hypocalciuria, severe hypomagnesemia, and prominent muscular involvements such as fatigue, weakness, cramps, and tetany. It is due to mutations in the thiazide sensitive NaCl co-transporter in the distal convoluted tubule. The administration of thiazide diuretics may induce a subnormal increase of urinary Cl− excretion in patients with Gitelman′s syndrome, consistent with the hypothesis that less than normal Cl− is reabsorbed by the thiazide-inhibitable transporter in Gitelman′s syndrome. Thus, we report a case of Gitelman′s syndrome presenting with quadriparesis diagnosed by using thiazide clearance test

An uncommon initial presentation of snake bite-subarachnoid hemorrhage: A case report with literature review

Snake bites are very common in India, particularly in West Bengal. Snake bite can cause various hematological, neuromyopathical complications. It can be very fatal if not detected and treated early. Timely intervention can save the patient. We are reporting a case of hematotoxic Russell viper snake bite presented with subarachnoid hemorrhage. Patient was successfully treated with antivenom serum (AVS) along with other conservative management. Subarachnoid hemorrhage as an initial presentation in viper bite is very rare and we discuss the case with proper literature review