Shadow detection in real scene images is always a challenging but yet interesting area. Most shadow detection and segmentation methods are based on image analysis. This paper aimed to give a comprehensive and critical study of current shadow detection methods. Various approaches have been discussed related to shadow detection in images. The principles of these methods rely on intensity differen...

The Neotropical genus SchacontiaDyar (1914) is reviewed and revised to include eleven species. Schacontia replica Dyar, 1914, syn. n. and Schacontia pfeifferi Amsel, 1956, syn. n. are synonymized with Schacontia chanesalis (Druce, 1899) and eight new species are described: Schacontia umbra,sp. n., Schacontia speciosa,sp. n., Schacontia themis, sp. n., Schacontia rasa, sp. n., Schacontia nyx,sp....

Nothobranchius rachowi, a tropical fish that belongs to the family of the Cyprinodontidae, is introduced as a new animal for genetic toxicological studies. The karyotype of N. rachowi consists of 16 large chromosomes. This species can be used for studies on chromosomal aberrations as well as for observations on sister-chromatid exchanges (SCEs). Exposure to 120 mg ethyl methanesulphonate per li...

Oscillations in stomatal resistance to viscous air flow have been recorded in the juvenile and adult sclerophylls of Eucalyptus umbra R. T. Baker, in both controlled and natural environments. Under constant illumination, temperature, and humidity, irregular oscillations in stomatal resistance with a periodicity of approximately 20 to 30 minutes occurred spontaneously, when the soil water potent...

In this paper we study Multiple periodic solutions for a class of non-autonomous and convex Hamiltonian systems and we investigate use some properties of Ekeland index.  

Abstract We present a detailed study of very strong magnetic fields in the NOAA Active Region (AR) 12673, which was most flare productive AR solar cycle 24. It produced four X-class flares including X9.3 on 2017 September 6 and X8.2 limb event 10. Our analysis is based direct measurements full Zeeman splitting Fe i 1564.85 nm line using all Stokes I, Q, U, V profiles. This approach allowed us t...

Kodaikanal Solar Observatory (KoSO) possesses one of world's longest and homogeneous records sunspot observations that span more than a century (1904-2017). Interestingly, these (originally recorded in photographic plates/films) were taken with the same setup over this entire time period which makes data unique best suitable for long-term solar variability studies. A large part data, between 19...

In \citet{Stangalini20} and \citet{Deb20}, magnetic oscillations were detected in the chromosphere of a large sunspot found to be linked coronal locations where First Ionization Potential (FIP) effect was observed. an attempt shed light onto possible excitation mechanisms these localized waves, we further investigate same data by focussing on relation between spatial distribution wave power ove...