On feature reduction with application to electroencephalograms

Random process model and feature reduction of spontaneous and alpha frequency electroencephalogram

Interplanetary Consequences of a Large CME

We analyze a coronal mass ejection (CME) which resulted from an intense flare in active region AR486 on November 4, 2003. The CME propagation and speed are studied with interplanetary scintillation images, near-Earth space mission data, and Ulysses measurements. Together, these diverse diagnostics suggest that the internal magnetic energy of the CME determines its interplanetary consequences.Comment: 5 pages, 9 figures, To appear in "Magnetic Coupling between the Interior and the Atmosphere of the Sun", eds. S.S. Hasan and R.J. Rutten, Astrophysics and Space Science Proceedings, Springer-Verlag, Heidelberg, Berlin, 200

Night sky at the Indian Astronomical Observatory during 2000-2008

We present an analysis of the optical night sky brightness and extinction coefficient measurements in UBVRI at the Indian Astronomical Observatory (IAO), Hanle, during the period 2003-2008. They are obtained from an analysis of CCD images acquired at the 2 m Himalayan Chandra Telescope at IAO. Night sky brightness was estimated using 210 HFOSC images obtained on 47 nights and covering the declining phase of solar activity cycle-23. The zenith corrected values of the moonless night sky brightness in mag/square arcsecs are 22.14(U), 22.42(B), 21.28(V), 20.54(R) and 18.86(I) band. This shows that IAO is a dark site for optical observations. No clear dependency of sky brightness with solar activity is found. Extinction values at IAO are derived from an analysis of 1325 images over 58 nights. They are found to be 0.36 in U-band, 0.21 in B-band, 0.12 in V-band, 0.09 in R-band and 0.05 in I-band. On average, extinction during the summer months is slightly larger than that during the winter months. No clear evidence for a correlation between extinction in all bands and the average night time wind speed is found. Also presented here is the low resolution moonless optical night sky spectrum for IAO covering the wavelength range 3000-9300 \AA. Hanle region thus has the required characteristics of a good astronomical site in terms of night sky brightness and extinction, and could be a natural candidate site for any future large aperture Indian optical-infrared telescope(s).Comment: 18 pages, 7 figures, uses basi.cls, accepted for publication in Bulletin of the Astronomical Society of Indi

Validity of international ovarian tumour analysis simple rules in characterization of ovarian mass

Background: Ovarian malignancy is one of the most common cancer in women and is diagnosed at later stage in majority. The limiting factor for early diagnosis is lack of standardized terms and procedures in gynaecological sonography. Recently, IOTA simple rules have been externally validated to have an increased sensitivity and specificity in diagnosing ovarian malignancy. Methods: This is a prospective study in the Department of obstetrics and gynaecology conducted at ESIC-MC & PGIMSR Hospital, Bangalore from January 2020 to June 2021. 50 women diagnosed with ovarian mass and scheduled for surgery were admitted and evaluated for nature of ovarian mass using IOTA simple rules on ultrasonography and correlated with their histopathological diagnosis. Results: Among 50 ovarian masses, all 38 masses (76%) characterized as benign by IOTA simple rules were true benign (100%) on histopathological diagnosis. 10 masses (20%) characterized as malignant, 9 were true malignant and 1 was false malignant on histopathological diagnosis. 2 cases which were inconclusive by IOTA simple rules were characterized as benign on histopathological diagnosis. Thus in our study test sensitivity was 100%, specificity 97.56%, positive predictive value 90% and negative predictive value 100%. Conclusions: In clinical practice, IOTA simple rules as a diagnostic tool helps in characterization of most ovarian masses, which aids in optimal management and enhance better outcome. In ovarian masses for which the rules yielded an inconclusive results, subjective assessment by an experienced sonologist is advocatedd

Optical Photometry of the GRB 010222 Afterglow

The optical afterglow of GRB 010222 was observed using the recently installed 2-m telescope at the Indian Astronomical Observatory, Hanle, and the telescopes at the Vainu Bappu Observatory, Kavalur, beginning ~ 0.6 day after the detection of the event. The results based on these photometric observations combined with others reported in the literature are presented in this paper. The R band light curve shows an initial decline of intensities proportional to t^{-0.542} which steepens, after 10.3 hours, to t^{-1.263}. Following the model of collimated outflow, the early break in the light curve implies a very narrow beam angle (~ 2-3 deg). The two decay rates are consistent with the standard jet model in a uniform density ambient medium, but require a hard spectrum of electron power density with p ~ 1.5. The R band light between 14 and 17 hours since outburst departs from the power law fit by 0.1 mag and shows some evidence for fluctuations over timescales of an hour in the observer's frame. Such deviations are expected due to density inhomogeneities if the ambient medium is similar to the local interstellar medium. GRB 010222 is thus an example of a highly collimated outflow with a hard spectrum of electron energy distribution in normal interstellar environment.Comment: 15 pages, Latex, including 2 postscript figures, to appear in the Bull. astro. Soc. India, September 2001 issu

Rosuvastatin plus fenofibrate in diabetic dyslipidemia: a hospital record based study

Background: Cardiovascular diseases (CVD) are the leading cause of death throughout world population each and every year. Focus on dyslipidemia management is urgently required in India to halt the rising tide of CVD. The purpose of diabetic dyslipidemia study is a record based one, to find out the effect of Rosuvastatin plus Fenofibrate, in adult Type 2 diabetes with dyslipidemia, with high TGL/HDL ratio in Lipid profiles, in a tertiary care hospital in the Union territory of Puducherry.Methods: There were 101 patients hospital records were analysed in which male were 45 and females were 56. The various biochemical parameters like serum Total Cholesterol, HDL, LDL, TGL, Non-HDL, TCL/HDL Ratio and TGL/HDL ratio reports were collected before and after 12-weeks of Rosuvastatin 10 mg with Fenofibrate 145 mg combination, for the treatment period once daily for their lipid-lowering therapy.Results: The combination therapies of Rosuvastatin plus Fenofibrate were safe and feasible to achieve more TG goal and proved that has predominately decreased the elevated lipid profiles from the medical resources of our record based study. The use of combination medications of rosuvastatin (10mg) plus Fenofibrate (145mg) is often needed to effectively treat the lipid triad, by the potency of rosuvastatin to lower LDL-C and Fenofibrates effectiveness in lowering TG in treating mixed diabetic dyslipidemia.Conclusions: After Rosuvastatin (10mg) plus Fenofibrate (145mg), the lipid profile data proved that the importance of TGL/HDL ratio apart from the TCL/HDL ratio, for good lipid control in diabetic dyslipidemic patients

Retrieval of Anomaly Details Using Vehicle Number Plate Identification for Traffic Guards

The ascent in number of vehicles makes different issues in regular daily existence. Arranging such substantial number of vehicles and transportation are intricate and tedious assignment. This paper centers over the above issue. This framework will consequently perceive the number plate of vehicles. The perceived number plate takes after the given strides: 1.To catch continuous picture of number plate. 2. To fragment and perceive characters at the server. 3. Perceived tag is shown on the graphical UI and furthermore put away in database alongside time and date for further utilize. 4. Book the complaint against the anomaly. The different methodologies for the issue are contemplated as takes after

Multi-frequency, Multi-Epoch Study of Mrk 501: Hints for a two-component nature of the emission

Since the detection of very high energy (VHE) $\gamma$-rays from Mrk 501, its broad band emission of radiation was mostly and quite effectively modeled using one zone emission scenario. However, broadband spectral and flux variability studies enabled by the multiwavelength campaigns carried out during the recent years have revealed rather complex behavior of Mrk 501. The observed emission from Mrk 501 could be due to a complex superposition of multiple emission zones. Moreover new evidences of detection of very hard intrinsic $\gamma$-ray spectra obtained from {\it Fermi}--LAT observations have challenged the theories about origin of VHE $\gamma$-rays. Our studies based on {\it Fermi}--LAT data indicate the existence of two separate components in the spectrum, one for low energy $\gamma$-rays and the other for high energy $\gamma$-rays. Using multiwaveband data from several ground and space based instruments, in addition to HAGAR data, the spectral energy distribution of Mrk~501 is obtained for various flux states observed during 2011. In the present work, this observed broadband spectral energy distribution is reproduced with a leptonic, multi-zone Synchrotron Self-Compton model.Comment: Published in Astrophysical Journal (ApJ

The evolution of the peculiar Type Ia supernova SN 2005hk over 400 days

$UBVRI$ photometry and medium resolution optical spectroscopy of peculiar Type Ia supernova SN 2005hk are presented and analysed, covering the pre-maximum phase to around 400 days after explosion. The supernova is found to be underluminous compared to "normal" Type Ia supernovae. The photometric and spectroscopic evolution of SN 2005hk is remarkably similar to the peculiar Type Ia event SN 2002cx. The expansion velocity of the supernova ejecta is found to be lower than normal Type Ia events. The spectra obtained \gsim 200 days since explosion do not show the presence of forbidden [\ion{Fe}{ii}], [\ion{Fe}{iii}] and [\ion{Co}{iii}] lines, but are dominated by narrow, permitted \ion{Fe}{ii}, NIR \ion{Ca}{ii} and \ion{Na}{i} lines with P-Cygni profiles. Thermonuclear explosion model with Chandrasekhar mass ejecta and a kinetic energy smaller (\KE = 0.3 \times 10^{51} {\rm ergs}) than that of canonical Type Ia supernovae is found to well explain the observed bolometric light curve. The mass of \Nifs synthesized in this explosion is 0.18 \Msun. The early spectra are successfully modeled with this less energetic model with some modifications of the abundance distribution. The late spectrum is explained as a combination of a photospheric component and a nebular component.Comment: Accepted for publication in The Astrophysical Journal. Minor revision, discussion section adde