IEEE 802.X Mobile Ad-Hoc Network Performance Measurement

Wireless ad-hoc network does not rely on a preexisting infrastructure unlike the wired and managed wireless networks and hence are decentralized in nature. This decentralized nature makes it suitable for some services, which are mobile in nature. It is more scalable to design a service using a wireless ad-hoc network, where centralized design cannot be relied on. This makes it important to measure the performance of a wireless ad-hoc network to determine its theoretical and practical limits. A wireless network performance is dependent on a lot of factors, some of them are blindingly obvious while others are relatively obscure. Which makes the measurements of such limits challenging. In this study we review the previous works done so far, to determine the performance of wireless ad-hoc networks. Another purpose of this study is to calculate the theoretical limit of the performance of such networks. Finally we carry out experiments in real life conditions and use the results to find out the difference between theoretical and practical limits

An Efficient Method for the Synthesis of Dihydropyrimidines Using Bronsted Acidic Ionic Liquid: a Solvent and Heating Free Reaction

This work was funded by Russian Science Foundation (Ref. No. 18-73-00301)

MECHANOCHEMICAL CROSS DEHYDROGENATIVE COUPLING: SYNTHESES OF VARIOUS ORGANIC MOLECULES

S. Santra is thankful to the Russian Science Foundation (ref # 20-73-10205) for funding

A Cross-sectional Observational Study of the Etio-pathology, Socioeconomic Distribution and Clinical Pictures of Ectopic Pregnancy in a Tertiary Medical College and Hospital in Bankura, West Bengal, India

Background: Ectopic pregnancy or abnormal implantation of embryo is one of the foremost causes of mortality and morbidity in women of reproductive age worldwide. Its serious consequences can be effectively averted by early diagnosis and timely intervention. This study aimed at determining the incidence, predisposing socio-economic factors and etiolo-pathology, and assessment of various clinical manifestations and treatment modalities of ectopic pregnancy. Methods: This observational cross- sectional survey was conducted in the department of obstetrics and gynaecology BSMCH, Bankura from 1.4.2015 to 31.3.2016. It included 100 patients with admitted with clinically or sonologically confirmed ectopic pregnancy after informed consent, data was collected and analysed thereafter. Results: It was observed that 68% of the cases belonged to 21-30 years of age, 80% with low socio-economic status, 69 % comprised of multigravidas. The typical risk factors detected were history of PID, abortion and previous tubal surgery. The most consistent clinical feature was pain in lower abdomen (98%) followed by amenorrhoea (90%) and vaginal bleeding (82%). 97% of the patients presented with pallor and 23% with shock. In 73% patients cervical motion tenderness could be elicited clinically and adnexal mass in USG was found in 95 %. Urine pregnancy test was positive in all patients and right side was the commonest side of involvement (53%). All the patients underwent surgical intervention. Conclusion: Prompt detection from history, clinical features, USG and appropriate and well-timed management are of utmost importance to enhance better maternal survival and conservation of reproductive capacity. Keywords: Ectopic pregnancy, UPT, PID, Tubal surgery, Adnexal mass, POD fluid, Ampull

A CONVENIENT AND SUSTAINABLE METHOD FOR THE SYNTHESIS OF 4-SUBSTITUTED COUMARINS CATALYZED BY BRØNSTED ACIDIC IONIC LIQUIDS

The authors thank Russian Science Foundation (Ref. # 20-73-10205)

Effect of Alkylation on the Kinetic Stability of Arsenodiester and Organoarsenicals against Hydrolysis: A Theoretical Study

Received: 14.06.2018. Accepted: 27.07.2018. Published: 30.07.2018.Arsenic diesters have same structural and chemical properties as Pi (phosphate) diester. Beside this structural similarity, arsenate is not considered by cellular processes to replace phosphate. Quantum calculation reveals that this happens due to very high hydrolysis rate of Asi diester (As–O-bond-based compounds) as compared to Pi, but how organoarsenicals (As–C-bond-based compounds) that are produced by alkylation of Asi survive in highly aqueous tissues of marine organisms? We found that this alkylation results in lower hydrolysis rate of Asi diester. Our work concluded that alkylating effort by our body on Asi is to avoid structural ambiguity with phosphate and excrete out arsenic in the form of organoarsenicals from body

Bronsted Acidic Ionic Liquid: an Efficient and Reusable Catalyst for the Synthesis of Coumarin Derivatives

This work was funded by Russian Science Foundation (Ref. No. 18-73-00301)

Recent advances in visible light mediated photoinduced aryl radical generation and its application in synthesis

The reactions involving aryl radicals is an efficient strategy for the synthesis of a wide variety of important molecules. We have highlighted here recent developments on the generation of aryl radicals from various substrates by visible light mediated photocatalysis and their reactions with different substrates to produce a library of arylated and het-arylated compounds. These reactions are performed at room temperature using LED bulbs. Thus, this strategy is green involving less energy