MatriVasha: A Multipurpose Comprehensive Database for Bangla Handwritten Compound Characters

At present, recognition of the Bangla handwriting compound character has been an essential issue for many years. In recent years there have been application-based researches in machine learning, and deep learning, which is gained interest, and most notably is handwriting recognition because it has a tremendous application such as Bangla OCR. MatrriVasha, the project which can recognize Bangla, handwritten several compound characters. Currently, compound character recognition is an important topic due to its variant application, and helps to create old forms, and information digitization with reliability. But unfortunately, there is a lack of a comprehensive dataset that can categorize all types of Bangla compound characters. MatrriVasha is an attempt to align compound character, and it's challenging because each person has a unique style of writing shapes. After all, MatrriVasha has proposed a dataset that intends to recognize Bangla 120(one hundred twenty) compound characters that consist of 2552(two thousand five hundred fifty-two) isolated handwritten characters written unique writers which were collected from within Bangladesh. This dataset faced problems in terms of the district, age, and gender-based written related research because the samples were collected that includes a verity of the district, age group, and the equal number of males, and females. As of now, our proposed dataset is so far the most extensive dataset for Bangla compound characters. It is intended to frame the acknowledgment technique for handwritten Bangla compound character. In the future, this dataset will be made publicly available to help to widen the research.Comment: 19 fig, 2 tabl

Is depression a concern among medical students: a cross sectional study in different academic years of a private medical college in Bangladesh

Background: Depression is not uncommon among medical students all over the world. Few studies have been conducted so far in Bangladesh to depict its actual prevalence and severity. So, the aim of this study was to assess the severity of depression and the level of difficulty faced by medical students in different academic years.Methods: This cross-sectional study was conducted in North East medical college of Bangladesh from January 2018 to June 2018 involving 443 students from 1st year to 5th year. Students were instructed to fill up the patient health questionnaire (PHQ-9) which incorporates diagnostic and statistical manual of mental disorders (DSM-IV) depression diagnostic criteria categorized as no, mild, moderate, moderately severe, and severe depression and also evaluates their level of function.Results: The prevalence of depression was quite high (79.68%). 196 (44.24%) and 157 (35.44%) students had mild and major depression respectively, while 90 (20.32%) showed no depression. Students with major depression were scored as moderate depression 24.38%, moderately severe depression 8.35%, and severe depression 2.71%. Moderate depression was significantly higher in year 1 and year 2 students in comparison to year 3, 4 and 5. Students from year 1 to year 5 with mild, moderate, moderately severe and severe depression experienced varying degree of difficulty in their daily activities. Almost all the students in all years with severe depression found themselves very difficult or extremely difficult to cope.Conclusions: High prevalence of depression among medical students is really alarming and underlying factors need to be addressed

A Potential Bio-sorbent for Heavy Metals in the Remediation of Waste Water

Bay leaves are used for flavoring in cold drinks production, in bakery goods, sauces, confectionary products and liquors. The waste generated from these sources has been valorized by attempting the remediation of waste water. Hence, adsorption of toxic metals onto Bay leaves has been investigated after optimizing the experimental parameters, namely the pH, contact time, adsorbent and Zn(II) concentrations as well as the temperature of the equilibrium mixture (consisting of the metal solution in contact with the adsorbent). The participation of the constituent functional groups, of the adsorbent, was ascertained with Fourier transform spectroscopic studies. The mode of adsorption was examined by employing important isotherm models, namely Langmuir, Freundlich and Dubinin-Radushkevich models. The adsorption process was found to follow pseudo-first order kinetic model and also followed the intraparticle diffusion up to 60 minutes of contact time. The thermodynamic parameters suggest the spontaneous nature of adsorption

Paraperesis: A rare complication after depressed skull fracture

Depressed skull fracture is an inward buckling of the skull bones, often because of direct blow to a small surface area of the skull with a bluntobject. Monoparesis is often among its clinical presentations, but midline depressed skull fracture presenting as motor weakness of both lowerlimbs (Paraperesis) has not yet been reported. We report the case of 55 year old male admitted to emergency department with alleged history ofhit on head by a wooden rod. He had pain, mild swelling and a small cut over scalp without any symptoms & signs of neurological deficit. On daytwo of admission patient developed weakness of both lower limbs. On CT scan patient had bilateral depressed skull fracture of high parietal boneon either side of midline. Patient was managed conservatively, made remarkable recovery and was discharged after 2 weeks.Key words: Fracture, paraperesis, edema, depressed fracture, skul

Disorder mediated splitting of the cyclotron resonance in two-dimensional electron systems

We perform a direct study of the magnitude of the anomalous splitting in the cyclotron resonance (CR) of a two-dimensional electron system (2DES) as a function of sample disorder. In a series of AlGaAs/GaAs quantum wells, identical except for a range of carbon doping in the well, we find the CR splitting to vanish at high sample mobilities but to increase dramatically with increasing impurity density and electron scattering rates. This observation lends strong support to the conjecture that the non-zero wavevector, roton-like minimum in the dispersion of 2D magnetoplasmons comes into resonance with the CR, with the two modes being coupled via disorder.Comment: accepted to PRB Rapid Com

Acoustic phonon scattering in a low density, high mobility AlGaN/GaN field effect transistor

We report on the temperature dependence of the mobility, $\mu$, of the two-dimensional electron gas in a variable density AlGaN/GaN field effect transistor, with carrier densities ranging from 0.4$\times10^{12}$ cm$^{-2}$ to 3.0$\times10^{12}$ cm$^{-2}$ and a peak mobility of 80,000 cm$^{2}$/Vs. Between 20 K and 50 K we observe a linear dependence $\mu_{ac}^{-1} = \alpha$T indicating that acoustic phonon scattering dominates the temperature dependence of the mobility, with $\alpha$ being a monotonically increasing function of decreasing 2D electron density. This behavior is contrary to predictions of scattering in a degenerate electron gas, but consistent with calculations which account for thermal broadening and the temperature dependence of the electron screening. Our data imply a deformation potential D = 12-15 eV.Comment: 3 pages, 2 figures, RevTeX. Submitted to Appl Phys Let

Spectral, Magnetic and Biological Studie on Some Bivalent 3d Metal Complexes of Hydrazine Derived Schiff-Base Ligands

Metal(II) complexes of hydrazine derived Schiff-base ligands of the type M(L)2Cl2 where M = Co, Cu, Ni and Zn and L = L1 and L2 have been prepared and characterised by molar conductance, magnetic moment, elemental analysis and electronic, IR, H-NMR and 13C spectral data.The different modes of chelation of the ligands and their comparative biological properties against different bacterial species are reported

Biological Role of Cobalt(II), Copper(II) and Nickel(II) Metal Ions on the Antibacterial Properties of Some Nicotinoyl-Hydrazine Derived Compounds

Several cobalt(II), copper(II) and nickel(II) complexes of nicotinoylhydrazine-derived compounds were prepared and characterised by physical, spectral and analytical data. These compounds and their complexes have proven to be antibacterial. The screening data show the metal complexes to be more potential/bactericidal than the uncomplexed compounds against one or more bacterial species