24 research outputs found
Machine Learning Algorithm for Early Detection and Analysis of Brain Tumors Using MRI Images
Among the human body's organs, the brain is the most delicate and specialized. It is proven that after the heart stops then also brain death occurs within 3 to 5 minutes of death or within 3 to 5 minutes of loss of oxygen supply. A brain tumor is a life-threatening disease that can be detected at any age from an infant to an old person. Though a lot of people did research in the detection and analysis of a tumor, but then also detecting tumors at the early phase is still a much more arduous field in the biomedical study. This paper focuses on the comparative study of various existing algorithms in this field. This paper addresses the challenges and some issues in MRI brain tumor detection which are also addressed in this research
Acoustic and volumetric properties of aqueous solutions of imidazolium based ionic liquids at 298.15 K
Activity and Activity Coefficient Studies of Aqueous Binary Solutions of Procaine, Lidocaine, and Tetracaine Hydrochloride at 298.15 K
Thermodynamics of Azo Dye Adsorption on a Newly Synthesized Titania-Doped Silica Aerogel by Cogelation: A Comparative Investigation with Silica Aerogels and Activated Charcoal
The adsorption isotherms of azo dyes on a newly synthesized
titania-doped
silica (TdS) aerogel compared to silica aerogels and activated charcoal
(AC) are systematically investigated. Monolithic TdS aerogels were
synthesized by the cogelation process followed by supercritical drying
of tetraethyl orthosilicate (TEOS) as a gel precursor and titanium(IV)
isopropoxide (TTIP) as a metal complex precursor for co-polymerization
in ethanol solvent. An acid–base catalyst was used for the
hydrolysis and condensation of TEOS and TTIP. The effect of Ti4+ doping in a silica aerogel on the mesoporous structure and
the adsorption capacity of methylene blue (MB) and crystal violet
(CV) dyes were evaluated from the UV–vis absorption spectra.
In order to compare the adsorption isotherms, the surface areas of
silica and TdS aerogels were first normalized with respect to AC,
as adsorption is a surface phenomenon. The azo dye equilibrium adsorption
data were analyzed using different isotherm equations and found to
follow the Langmuir adsorption isotherm. The maximum monolayer adsorption
capacities for the adsorbent TdS aerogel normalized with the AC of
the Langmuir isotherm are 131.58 and 159.89 mg/g for MB and CV dyes,
respectively. From the Langmuir curve fitting, the Qmax value of the TdS aerogel was found to increase by
1.22-fold compared to AC, while it increased 1.25–1.53-fold
compared to the silica aerogel. After four cycles, regeneration efficiency
values for MB and CV dyes are about 84 and 80%, respectively. The
study demonstrates the excellent potential and recovery rate of silica
and TdS aerogel adsorbents in removing dyes from wastewater. The pore
volume and average pore size of the new aerogel, TdS, were found to
be lower than those of the silica aerogel. Thus, a new TdS aerogel
with a high capacity of adsorption of azo dyes is successfully achieved
Highly Efficient Regioselective Synthesis of 2‑Imino-4-oxothiazolidin-5-ylidene Acetates via a Substitution-Dependent Cyclization Sequence under Catalyst-Free Conditions at Ambient Temperature
A green
and efficient method for the synthesis of newer 2-imino-4-oxothiazolidin-5-ylidene
acetate derivatives under catalyst-free conditions by simply stirring
symmetrical and unsymmetrical 1,3-diarylthioureas with dialkyl acetylenedicarboxylates
in ethanol at room temperature has been developed. Interestingly,
the regioselective synthesis affords the 2-imino-4-oxothiazolidin-5-ylidene
acetate derivatives: the amine nitrogen bonded to an electron-withdrawing
substituent becomes part of the imino component, and the amine nitrogen
bonded to an electron-donating substituent becomes the heterocyclic
nitrogen. This is the first report wherein the impact of substituents
in directing the regiocyclization has been explained and the structure
conflict resolved by single-crystal X-ray analysis