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Advanced Journal of Chemistry, Section B
Number of Followers: 4  

  This is an Open Access Journal Open Access journal
ISSN (Online) 2716-9634
Published by Sami Publishing Company Homepage  [3 journals]
  • Investigation of Predictive Methods of Gas Hydrate Formation in Natural
           Gas Transmission Pipelines

    • Abstract: Natural gas hydrate is a solid crystalline compound formed from the composition of water and gas and is part of the clathrate family. Gas hydrate can be formed by pure gas or a gas mixture consisting of two or more components. Gas hydrates are recognized as non-stoichiometric solids. One of the methods or methods that has been most successful in predicting or recognizing hydrate phases in hydrocarbon equilibrium is based on the relative Kvs size of the vapor-solid equilibrium constant. Tables of equilibrium for species or constituents of hydrates known as normal butane are listed in various articles and books. With the discovery of the heaviest constituents of hydrates, their equilibrium constants need to be more accurately predicted in the un-hydrated phase of the hydrocarbon mixtures, especially in the reservoir fluids.
      PubDate: Fri, 31 Jul 2020 19:30:00 +010
       
  • A Review on Biomimetic Synthesis of Ag2O Nanoparticles using Plant
           Extract, Characterization ...

    • Abstract: Nanotechnology is a swiftly growing field due to its huge range of uses in various branches of science and technology. Divergent types of routes are employed for the production of nanoparticles (NPs) because of their broad applications. The conventional physical and chemical approaches have certain constraints with them either in the form of chemical contaminations during their syntheses methodology or use of higher amount of energy. During the last one or two decades research have been concentrated on creating facile, safe, non-noxious, affordable and eco-accommodating procedures for synthesis of NPs. In order to get this purpose, green synthesis approaches have been improved in order to fill this lacuna. The biogenic synthesis of NPs is facile, one pot, eco-benevolent, sustainable and a green methodology. The different biological specimens like plant tissues, yeast, bacteria, fungi, etc. are used for green synthesis for metal oxide NPs. In this review, we summed up recent literature on biomimetic synthesis of silver oxide (Ag2O) NPs which have revolutionized method of fabrication for their stupendous applications in various sectors. Due to biocompatibility of Ag2O NPs, it has found its efficacious applications in biomedical field. The characterization techniques and mechanism of green synthesis of Ag2O NPs along with diverse applications have also been investigated.
      PubDate: Fri, 31 Jul 2020 19:30:00 +010
       
  • Review of the Effects of SAGO Consumption on Oxidative Stress Exercise

    • Abstract: Exercise in hot and humid conditions cause remarkable physiologic challenges for endurance athletes. The aim of the current study was to investigate the effects of carbohydrate consumption during endurance cycling performance on F2–Isoprostanes as an oxidative stress biomarker. Sago flour is a commercial starch source that is frequently used in tropical countries, like Malaysia, as carbohydrate ingestion. The consumptions of sago have been shown to improve endurance performance. Twelve well–trained male cyclists (age: 19.0±5.6 years, body weight: 60.1±11.2 kg, height: 170.8±7.6 cm, and VO2max: 56.5±6.5 mL.kg-1.min-1) pedaled at 60% of VO2max for 1.5 hours followed by a 20–km cycling time trial in the heat (31°C; 70% relative humidity). From the start of the cycling and at 20– minute intervals during 1.5 hours cycling participants ingested 200 mL of 7.5% of the sago supplement. There was a significant reduction of plasma F2–Isoprostanes concentrations after endurance cycling as compared to the baseline levels. This study has shown that sago supplementation was able to lower the oxidative stress in the recovery after endurance cycling performance in the heat.
      PubDate: Fri, 31 Jul 2020 19:30:00 +010
       
  • The Electrochemical Study of the Effects of Herbal Tea on Calcium Oxalate
           Renal Stones

    • Abstract: Objective: Present study designed to evaluate the effectiveness of an extract obtained from Cleome dolichostyla on calcium oxalate crystallization in vitro. Materials and Methods: In this laboratory research, after taking the aqueous extract of 5 grams of Cleome dolichostyla by 100 ml of distilled water at gentle heating, the formation and dissolution of calcium oxalate in the absence and presence of extract was investigated by complexometric and conductometric methods. Results: The effect of the extracts on the prevention of sediment formation was studied and the results of the conductometric titration curve method for leaves of Cleome dolichostyla showed a significant difference (175.0 µmol) between the concentration of calcuim in the absence (450.0 µmol) and presence of the extract (625.0 µmol) and for seeds, the difference was (38/0 µmol) in the absence (450/0 µmol) and presence (488/0 µmol) of the extract. In the study of the effect of extract on the stone dissolution, the results of the complexometry method showed that the amount of calcium measured by the dissolution of calcium oxalate crystals for the leaves of Cleome dolichostyla in the presence of extract, was 2.5 µmol higher than that in the absence of extract and for seeds was 6.0 µmol higher. Conclusion: According to this study, Cleome dolichostyla aqueous extract dissolves calcium oxalate kidney stone, but cannot prevent the formation of them.
      PubDate: Fri, 31 Jul 2020 19:30:00 +010
       
  • A Review on Green Synthesis of Sulfur Nanoparticles via Plant Extract,
           Characterization and its ...

    • Abstract: Among diverse non-metal nanoparticles (NPs), sulfur nanoparticles (SNPs) are one of the most significant and intriguing nanomaterials. An important concern about the synthesis of SNPs is the formation of hazardous wastes, noxious by-products and ruinous pollutants. The best solution to mitigate and/or exclude these noxious substances are plant mediated biosynthesis of SNPs. Eco-benevolent SNPs from plant extracts have been identified as precious nanomaterial in various agricultural, biomedical and catalytic applications including lithium-sulfur batteries, pesticides, fungicides, carbon nanotube modification, gas sensor and neutron capture in cancer therapy because of their splendid performance and selectivity. They have captured the consideration of researchers owing to their sustainable, economical, non-noxious, convenient, green and eco-benevolent nature. This review attempts to cover the recent advancements in the biosynthesis, characterization techniques and applications of biogenic SNPs in environmental and biomedical systems. Furthermore, the stability of biosynthesized SNPs and mechanism of their formation are briefly discussed.
      PubDate: Fri, 31 Jul 2020 19:30:00 +010
       
  • The Impact of Effective Risk Management on Corporate Financial Performance

    • Abstract: This Present study examines the corporate financial performance and risk management in oil and gas companies. Basically, the importance and qualitative method of any research can be examined from two basic and applied aspects. In general, no comprehensive research has been conducted, regardless of the limited number of articles and sources that have occasionally examined and referred to the subject, as well as studies conducted at the theoretical level. Risk management is essentially the process of identifying, analyzing and accepting or reducing uncertainty in investment decisions. In terms of risk management in all financial markets, there are people who are always right and well-planned, both in terms of analysis and investment. In today's modern world, the importance of monetary and financial science is not hidden from anyone. In the meantime, the discussion of proper financial reporting and its various methods have particular importance due to the analysis of the next steps of investors. The most important type of financial information is information about companies and their performance.
      PubDate: Fri, 31 Jul 2020 19:30:00 +010
       
  • The necessity of risk management evaluations in petrochemical industries

    • Abstract: The study looked at the need to manage risk in the petrochemical industry due to the horrific events of recent accidents such as India's Bhopal (with 4,000 killed), Ukraine's Chernobyl (with 38 killed), Flixborough, England (With 28 people killed) and Italy's Seveso (with a gas mass released from the blast 6 km long and 1 km wide) (Flixborough Vapor Cloud Explosion). Recent events have drawn public attention to the chemical industry and various risks involved in the petrochemical industry, and then as a result have increased the need for systematic safety analysis of various processes in the chemical industry. According to the International Labor Organization, 5,000 people die every day in the world due to accidents and work-related illnesses and 4% of the world's GDP per year, or 51.53, 1.3 and 2 percent, respectively. Millions of US dollars are spent on direct and indirect costs of work-related illnesses and accidents, which is 20 times more than the total international aid for development of third world countries
      PubDate: Fri, 31 Jul 2020 19:30:00 +010
       
  • Synthesis of monodisperse magnetic hydroxyapatite/Fe3O4 nanospheres for
           removal of Brilliant ...

    • Abstract: Conventional wastewater treatments such as chemical coagulation, activated sludge, trickling filter, carbon adsorption and photo-degradation were used for the removal of dyes. The characteristics of (HAp /Fe3O4) were investigated using Fourier transform infrared (FTIR) and scanning electron microscope (SEM). The surface area was measured by the Brunauer–Emmett–Teller (BET) nitrogen adsorption apparatus. The crystal phases of the products were characterized by X-ray diffraction with monochromatic Cu Ka radiation. Selectivity analysis for binary system dye removal was investigated. The effect of operational parameter (adsorbent dosage, dye concentration and salt) on dye removal was evaluated in details. UV–vis spectrophotometer was employed for absorbance measurements of samples. The maximum wavelength used for determination of residual concentration of CBB and BG in supernatant solution using UV–vis spectrophotometer were 627 nm, 629 nm, respectively. The effect of adsorbent dosage on dye removal from single (sin.) and binary (bin.) systems was investigated by contacting 10 mL of dye solution with initial dye concentration of 5 mg/L at single (sin.) and binary (bin.). In this paper, monodisperse magnetic HAp (HAp/Fe3O4) microspheres was synthesized and used for the remove dye from single (sin.) and binary (bin.) systems.
      PubDate: Fri, 31 Jul 2020 19:30:00 +010
       
  • Isolation and structural elucidation of new steroid from Stem Bark of
           Boswellia papyrifera (Del. ...

    • Abstract: Phytochemical investigation on the ethanol extract of Boswellia papyrifera stem barks let to the isolation of new sterol (29-methyl, nonanoate-cholest-7, 22-dien-3β-ol 2) along with three known related compounds, Stigmasterol 1, β-sitosterol-3-O-β-D-glucoside 3 and Spinasterol 3-O-β-Dglucopyranoside 4. Their structures were defined by various spectroscopic studies including 1D, 2D-NMR, MS analysis and by comparison with those reported in the literature.
      PubDate: Fri, 31 Jul 2020 19:30:00 +010
       
  • Synthesis of a fluorescent mechanochromic polymer based on TGA-capped CdTe
           Quantum Dots and ...

    • Abstract: A flexible polymer based on latex and CdTe Quantum Dots (QDs) is introduced here which shows color changing properties under UV light as the polymer is stretched. After synthesis of TGA-capped CdTe QDs with different sizes and emissions in the optimal conditions, the flexible polymer is synthesized and different colors such as green, pale green, white, and pale red were observed under UV light. The effective parameters of fluorescent QDs such as size, extinction coefficients, and concentrations were calculated by absorption and emission spectra.
      PubDate: Fri, 31 Jul 2020 19:30:00 +010
       
 
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