Solar Coronal Density Turbulence and Magnetic Field Strength at the Source Regions of Two Successive Metric Type II Radio Bursts

We report spectral and polarimeter observations of two weak, low-frequency (≈85–60 MHz) solar coronal type II radio bursts that occurred on 2020 May 29 within a time interval ≈2 minutes. The bursts had fine structures, and were due to harmonic plasma emission. Our analysis indicates that the magnetohydrodynamic shocks responsible for the first and second type II bursts were generated by the leading edge (LE) of an extreme-ultraviolet flux rope/coronal mass ejection (CME) and interaction of its flank with a neighboring coronal structure, respectively. The CME deflected from the radial direction by ≈25° during propagation in the near-Sun corona. The estimated power spectral density and magnetic field strength (B) near the location of the first burst at heliocentric distance r ≈ 1.35 Re are ≈2 × 10−3 W2m and ≈1.8 G, respectively. The corresponding values for the second burst at the same r are ≈10−3 W2 m and ≈0.9 G. The significant spatial scales of the coronal turbulence at the location of the two type II bursts are ≈62–1 Mm. Our conclusions from the present work are that the turbulence and magnetic field strength in the coronal region near the CME LE are higher compared to the corresponding values close to its flank. The derived estimates of the two parameters correspond to the same r for both the CME LE and its flank, with a delay of ≈2 minutes for the latter.Peer reviewe

POOL BOILING OF WATER OVER A STAINLESS STEEL FLAT PLATE HEATER

The purpose of this experiment is to study heat transfer characteristics of water through pool boiling over a flat stainless steel plate heater. The present experimental data of water is in good agreement with Stephen and Abdelsalam correlation (1980) with the given heat flux range 30-750 kW/m2. Without any modification in the Stephen and Abdelsalam correlation (1980), it is observed that the experimental data of water are within an error band of ± 20 percent, this is because of the Stephen and Abdelsalam correlation (1980) predicts their own data in an error band of 11.3 percent. In order to minimize the error band, the pool boiling experimental data of water have been analyzed by regression analysis using Stephen and Abdelsalam correlation (1980) and the powers and coefficient of the terms in the correlation are modified and the optimum values of the power index and coefficient which gives the minimum error band of ± 10 is obtained

Miniplate Removal Post-Open Reduction Internal Fixation: A Retrospective Analysis

Evolution of fracture management after the advent of asepsis and anesthesia has changed its trend toward open reduction and internal fixation(ORIF). In maxillofacial skeleton, to re-establish both form and function, semi-rigid fixation has been favored in recent times. Miniplates are commonly made of stainless steel and titanium. The fate of these post-ORIF is still controversial with both schools of thought providing substantial valid arguments. Aim of this study is to assess the incidence, site, type of material and reason for miniplate removal. This retrospective observational study was conducted among patients who reported to the Department of Oral and maxillofacial surgery, Saveetha Dental College, Chennai between June 2019 to March 2020. Inclusion criterias were patients of both gender and any age group undergoing miniplate removal post-ORIF and exclusion criteria were those undergoing hardware removal secondary to other procedures like orthognathic or reconstructive surgery and patients who are suffering from debilitating injuries physically and mentally challenged patients. Among 17 patients evaluated, incidence of miniplate removal was more common in males (76.5%) in the third decade of life. Infection (82.4%) was the most common reason for removal, while stainless steel was the most common type of miniplate removed (82.4%). 88.2% of miniplates removed had an adjacent dentate structure. No association was found between reason for removal and type of miniplate, proximity to dentate structure and reason for removal. Prospective studies and systematic analysis required to arrive at consensus

An investigation on image denoising technique using pixel-component-analysis

This paper authenticates a proficient image denoising scheme with the analysis local pixel coherence. In the dominion of a study about noise and pixel elements in image processing, the influence of the Gaussian effect on image contrast plays a key role. It is found in particular that pixel variations may be vast in some cases which potentially tend to develop irregularities in the image

19-Ferrocenyl-18-oxa-8,16-diaza­penta­cyclo­[8.6.3.01,10.02,7.012,16]nona­deca-2(7),3,5-triene-9,17-dione

In the title compound, [Fe(C5H5)(C21H19N2O3)], both pyrrol­idine rings of the pyrrolizine substructure show an envelope conformation. In the ferrocenyl moiety, the unsubstituted cyclo­penta­dienyl ring is disordered over two orientations with site occupancies of 0.64 (2) and 0.36 (2). In the pyrrolizine ring, one C atom is disordered over two positions, with site occupancies of 0.71 (1) and 0.29 (1). Intra­molecular C—H⋯O inter­actions occur. The crystal packing is established through weak inter­molecular C—H⋯O and N—H⋯O inter­actions

4′-Ferrocenyl-1′-methylacenapthylene-1-spiro-2′-pyrrolidine-3′-spiro-2′′-indane-2,1′′,3′′(1H)-trione

In the title compound, [Fe(C5H5)(C29H20NO3)], the acenaphthyl­ene ring system makes a dihedral angle of 83.77 (3)° with the indane-1,3-dione ring system. The central pyrrolidine ring exhibits a twist conformation. In the crystal, mol­ecules are linked by a weak inter­molecular C—H⋯O inter­action into a chain along the b axis. Two weak intra­molecular C—H⋯O inter­actions are also present

Methyl 9-p-tolyl-8a,9,9a,10,11,12,13,14a-octa­hydro-8H-benzo[f]chromeno[3,4-b]indolizine-8a-carboxyl­ate

In the title compound, C28H29NO3, the fused pyrrolidine and piperidine rings of the octa­hydro­indolizine unit exhibit envelope and chair conformations, respectively. The dihedral angle between the naphthalene ring system and the benzene ring is 40.37 (5)°. The crystal packing is stabilized by weak inter­molecular C—H⋯O inter­actions

A Comparative study of Siriraj and Greek Score in Differentiating Acute Ischemic Stroke from Hemorrhagic Stroke

BACKGROUND: Stroke is an important cause of death and disability in India, with a prevalence of 262/1000000 in rural areas and 424/100000 in urban areas. Classifying stroke in to Ischaemic and Haemorrhagic stroke as early as possible is very essential to start treatment. METHODS: A cross-sectional study was conducted in 120 patients with features of Anterior circulation stroke admitted to our hospital and the data collected is used to compute Siriraj and Greek stroke score. RESULTS: Analysis of Siriraj and Greek stroke scores shows accuracy of 62.3% and 79.2% in detecting Infarct respectively. Both scores shows 91.5 % accuracy in detecting Haemorrhage. CONCLUSION: Both the scores can be used to rule out Haemorrhage in rural set-ups where immediate radiographing is not available. When both the scores are used simultaneously, accuracy increases. Still, CT Brain is the investigatory modality whenever it is available