An efficient sequential four-component reaction of chromone carbaldehydes, Meldrum's acid, 4-hydroxyl coumarin or 6-methyl-4-hydroxyl-pyrone and primary alcohols is reported which leads to 5a-i in aqueous media. Replacing the primary alcohol with isopropyl alcohol and tert-butyl alcohol results in different products 10 and 11. The environmentally friendly features, good to high yields and easy ...

Bio BIO I'm a professional computational scientist. I specialize in simulations of complex multidimensional flows and transport (6 years), simulation of heat transfer (6 years), parallel computations in MPI (6 years), scientific visualization and data processing (6 years), simulations and mesh preparation in OpenFOAM (2 years), development in Wolfram Mathematica (6 years), Python and Fortran 90...

Indigenous acidophilic bacteria separated from mine-waste can be used in return for the addition of the reagents like sulfuric acid. Among the tailings bacteria, Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans are of the most-studied ones for the bioleaching and bioremediation of elements. In this work, the isolation and characterization of the mentioned bacteria are studied by...

The paper presents a study on automatic sentence boundary detection in social media texts such as Facebook messages and Twitter micro-blogs (tweets). We explore the limitations of using existing rule-based sentence boundary detection systems on social media text, and as an alternative investigate applying three machine learning algorithms (Conditional Random Fields, Naïve Bayes, and Sequential ...

BACKGROUND The success of in vitro fertilization techniques is defined by multiple factors including embryo culture conditions, related to the composition of the culture medium. In view of the lack of solid scientific data and in view of the current general belief that sequential media are superior to single media, the aim of this randomized study was to compare the embryo quality in two types ...

-Detection of important events in a region through social media has been a recent development with scope for multiple applications. One of the applications is the analysis of the mobility of the users in the region to adapt the energy and resources as per their movement. For this purpose, the travel or movement behaviour of the social media users is analysed through their posts and related mess...

abstract background iron overload is a major problem in patients with major thalassemia. an effective and safe iron chelator protocol with high compliance rate plays an important role in treatment of these patients. this study was done to assess the efficacy and safety of the sequential deferoxamine and deferasirox protocol in major thalassemia patients in khuzestan province, iran. material and...

The modeling of three-phase fluid flow has many important applications in reservoir simulation. In this paper, we introduce a high order method for sequentially solving the phase pressuresaturation formulation of three-phase flow. The sequential approach, while less stable than a fully coupled approach, is more computationally efficient. We present a discontinuous Galerkin method in space, suit...