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    Wyświetlanie 1-5 z 5
    Tytuł:
    Adsorption kinetic, equilibrium and thermodynamic investigations of Zn(II) and Ni(II) ions removal by poly(azomethinethioamide) resin with pendent chlorobenzylidine ring
    Autorzy:
    Kumar, P. S.
    Ethiraj, H.
    Venkat, A.
    Deepika, N.
    Nivedha, S.
    Vidhyadevi, T.
    Ravikumar, L.
    Sivanesan, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/780002.pdf
    Data publikacji:
    2015
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    adsorption
    models
    Ni(II) ions
    poly(azomethinethioamide)
    Zn(II) ions
    Opis:
    This paper reports the application of poly(azomethinethioamide) (PATA) resin having the pendent chlorobenzylidine ring for the removal of heavy metal ions such as Zn(II) and Ni(II) ions from the aqueous solutions by adsorption technology. Kinetic, equilibrium and thermodynamic models for Zn(II) and Ni(II) ions adsorption were applied by considering the effect of contact time, initial metal ion concentration and temperature data, respectively. The adsorption influencing parameters for the maximum removal of metal ions were optimized. Adsorption kinetic results followed the pseudo-second order kinetic model based on the correlation coefficient (R2) values and closed approach of experimental and calculated equilibrium adsorption capacity values. The removal mechanism of metal ions by PATA was explained with the Boyd kinetic model, Weber and Morris intraparticle diffusion model and Shrinking Core Model (SCM). Adsorption equilibrium results followed the Freundlich model based on the R2 values and error functions. The maximum monolayer adsorption capacity of PATA for Zn(II) and Ni(II) ions removal were found to be 105.4 mg/g and 97.3 mg/g, respectively. Thermodynamic study showed the adsorption process was feasible, spontaneous, and exothermic in nature.
    Źródło:
    Polish Journal of Chemical Technology; 2015, 17, 3; 100-109
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fire management on container ships: new strategies and technologies
    Autorzy:
    Ricci, S.
    Ravikumar, B.
    Rizzetto, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/24201466.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    fire safety
    container ship
    drone
    CCTV
    fiber optic
    control strategy
    cargo safety
    maritime transport
    Opis:
    Design and construction of container ships follow consolidated requirements, with standard consideration of fire management. Indeed, cargo fires can have important consequence on crewmembers and cargoes, as well as impacting coastal zone and marine environment. Innovative strategies include prevention of events and mitigation of consequences. Digital solutions, providing with situational pictures onboard and around the vessel are fundamental for new fire management solutions, seamless and integrated into the vessel IT infrastructure, according to IMO regulations and the recent EMSA CARGOSAFE Report. The assessment of these solutions requires theoretical evaluation, validation activities in simulated environment and demonstration activities in real environments, with use cases to prove feasibility and benefits. This paper, after a review of traditional preventing and mitigating solutions against fire and an analysis of container ships fires, proposes applicable innovative technologies and operational measures, emerging problems for their potential implementation and requirements for virtual and real tests design.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2023, 17, 2; 415--421
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biochemical and molecular studies of Jatropha curcas L. - Biofuel species
    Autorzy:
    Patil, Ravikumar S.
    Patted, Mahesh
    Savitha, G.
    Naik, G. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1165369.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Biofuel
    DGAT
    Jatropha curcas
    biodiesel
    genomic DNA and Triglycerides
    Opis:
    Fossil fuels plays vital role in the development of the nation. The limitation of the Non-renewable energy required alternative energy sources such as solar, wind energy, hydro energy and biomass energy etc., and these renewable energies are eco-friendly in nature. The study has conducted for the determination of fatty acid profile in Jatropha curcas oil, determination of restriction sites in genomic DNA of Jatropha curcas, comparison of DGAT gene sequence alignment of different plants using Clustal W software. and PCR amplification of DGAT gene. The results confirmed that the solvent extraction produced high quality oil. From the thin layer chromatography plate, the saturated fatty acid like Linoleinic acid (0.14), Palmatic acid (0.38), Stearic acid (0.72), and unsaturated fatty acid like and Oleic acid (0.90) were identified. The genomic DNA was restriction digested with EcoRI, BamHI, PstI, HindIII. The observed that restriction bands for EcoRI was 3 sites and for Hind III was 1 site respectively. The amplification of gene encoding DGAT gene from the genomic DNA was carried out by polymerase chain reaction and also by bioinformatics software and was found to be approximately 2 kb size. Our study makes initial step for altering of the Jatropha seed oil for enhancing the oil content level.
    Źródło:
    World Scientific News; 2018, 107; 108-124
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bioethanol production from agro waste – Pigeon pea (Cajanus cajan (L.) Millsp.) stalk using solid state fermentation
    Autorzy:
    Kirti, Kirti
    Patil, Ravikumar S.
    Londonkar, Ramesh L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1076037.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Aspergillus niger
    Bioethanol
    Cajanus cajan
    Pigeon pea
    Saccharomyces cerevisiae
    agro waste
    biomass
    lignocellulose
    Opis:
    In view of raising prices of crude oil and due to increasing demands the need for alternative sources of bioenergy is expected to increase sharply in the coming years. Cajanus cajan Stalks is the major agricultural residue, more than 25% primary energy demands met through imports mainly in the form of crude oil and natural gas. Biofuels as a domestic renewable energy source can significantly reduce India’s dependence on foreign oil and fossil fuels. The Plant cell wall is a composite material in which cellulose, hemicelluloses & lignin are closely associated. The major constraint in successful bioconversion process is the lignin. The study was conducted for various pretreatment methods. The best is the steam pretreatment method. This method serves as best and effective pretreatment with the maximum removal of lignin and isolation of more reducing sugars and less pentose’s. The alkaline method specially NaOH treatment is used for extraction of more pentose’s in crude extract. Finally, our approach was to find out the best pretreatment method that result in release of maximum reducing sugars. Steam pretreatment serves to be best followed by saccharification by cellulose. Further, these fermentable sugars can be utilized for bioethanol production. Cajanus cajan stalk is mostly cultivated in Kalaburagi district of Karnataka for that can be used for ethanol production. Screening for isolation of S. cereviceae was carried out by using baker’s yeast and was grown in YPD media. The optimization of culture condition was carried out for growth of yeast showed optimum temperature at 30 ºC and optimum pH at 5. Optimum Cellulase enzyme activity was found to be at temperature 40 ºC and pH 4.5. The ethanol production reaction was optimized by the maximum utilization of sugars by yeast was optimized by providing hexose and with combination of xylose at temperature 30 ºC and pH 5.0 and the inoculum size was optimized at 5% volume of total volume for SSF. From the above results, it is clear that the cellulase enzyme isolated from Aspergillus niger has ability to grow and produce hexoses under conditions of optimum temperature and acidic pH. The reducing sugar and pentose’s both can be used together for ethanol production. The obtained reducing sugar and pentose’s sugar conc. were 1.025 gm/500 ml & 0.5 gm/500 ml. This is only possible by using biological enzymatic pretreatment. The resultant substrate can used for making 2-3% ethanol. Thus fermentable sugars by these methods can be utilized for bioethanol production. The ethanol produced from this agro waste is 2-3% in lab scale. Then go for pilot scale 4-5% and later for industrial scale 7-8% by treat with different pretreatment methods using SSF. This helps in increases the utilization of wastes for economic use and improves the biofuel production resources.
    Źródło:
    World Scientific News; 2019, 117; 59-81
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of lead on growth and nutrient accumulation in Black gram (Vigna mungo L.)
    Autorzy:
    Ravikumar, S.
    Thamizhiniyzn, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/11034.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    lead
    toxic effect
    plant growth
    nutrient accumulation
    black gram
    Vigna mungo
    Opis:
    This study was conducted to investigate toxic effects of Pb on growth and nutrient uptake in Black gram. Black gram was subjected to seven (5, 10, 25, 50, 75, 100 & 200 kg-1) levels of lead. Due to Pb toxicity, plant growth was adversely affected and relatively a severe reduction in root biomass was recorded. The Pb accumulation increased with the increase in lead concentrations. The uptake of different nutrients, i.e., N, P, K, Ca and Mg was reduced in black gram due to the lead treatment.
    Źródło:
    International Letters of Natural Sciences; 2014, 16
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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