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    Wyświetlanie 1-4 z 4
    Tytuł:
    Geospatial Analysis of the Impact of Flood and Drought Hazards on Crop Land and Its Relationship with Human Migration at the District Level in Uttar Pradesh, India
    Autorzy:
    Islam, Zubairul
    Singh, Sudhir Kumar
    Powiązania:
    https://bibliotekanauki.pl/articles/1837994.pdf
    Data publikacji:
    2021
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    flood
    drought
    migration
    climate change
    hot spot analysis
    geographical weighted regression
    Opis:
    The main objective was to explore the connection between flood and drought hazards and their impact on crop land and human migration. The Flood and Drought effect on Cropland Index (FDCI), hot spot analysis and the Global Regression Analysis method was applied for the identification of the relationship between human migration and flood and drought hazards. The spatial pattern and hot and cold spots of FDCI, spatial autocorrelation and Getis-OrdGi* statistic techniques were used respectively. The FDCI was taken as an explanatory variable and human migration was taken as a dependent variable in the environment of the geographically weighted regression (GWR) model which was applied to measure the impact of flood and drought hazards on human migration. FDCI suggests a z-score of 4.9, which shows that the impact of flood and drought frequency on crop land is highly clustered. In the case of the hot spots analysis, out of seventy districts in Uttar Pradesh twenty-one were classified as hot spot and eight were classified as cold spots with a confidence level of 90 to 99%. Hot spot indicate maximum and cold spots show minimum impact of flood and drought hazards on crop land. The impact of flood and drought hazards on human migration show that there are fourteen districts where migration out is far more than predicted while there are ten districts where migration out is far lower.
    Źródło:
    Geomatics and Environmental Engineering; 2021, 15, 4; 117-127
    1898-1135
    Pojawia się w:
    Geomatics and Environmental Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A review of the Indian species of genus Polygraphus Erichson, 1836 (Coleoptera: Curculionidae: Scolytinae) with bio-ecological notes on P. major, a pest of Pinus wallichiana A. B. Jacks (Pinaceae) in Kashmir, India
    Autorzy:
    Khanday, Abdul Lateef
    Buhroo, Abdul Ahad
    Kerchev, Ivan Andreevich
    Singh, Sudhir
    Zubair, R.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2041523.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    bark beetles
    Polygraphus
    bioecology
    Kashmir
    Opis:
    The Indian species of the genus Polygraphus Erichson, 1836 (Coleoptera: Curculionidae: Scolytinae) collected from various localities of the Western Himalayan region and the species available at the National Forest Insect Collection (NFIC), Forest Research Institute, Dehradun (India) were studied and are reviewed herewith. A key to Indian species of Polygraphus is provided. Detailed bioecological field and laboratory observations of P. major including mating behaviour, gallery pattern, life cycle and seasonal history are reported.
    Źródło:
    Folia Forestalia Polonica. Series A . Forestry; 2020, 62, 3; 171-183
    0071-6677
    Pojawia się w:
    Folia Forestalia Polonica. Series A . Forestry
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies on Curing of an Aluminized Ammonium Perchlorate Composite Propellant Based on Nitrile Butadiene Rubber Using a Quinol Ether of 1,4-Benzoquinone Dioxime
    Autorzy:
    Singh, Sudhir
    Raveendran, Sidharth
    Kshirsagar, Dhirendra R.
    Gupta, Manoj
    Bhongale, Chetan J.
    Powiązania:
    https://bibliotekanauki.pl/articles/27788068.pdf
    Data publikacji:
    2022
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    dinitrosobenzene
    nitrile butatadiene rubber
    quinol ether
    unsaturated rubber
    Opis:
    The isocyanate-based curing agents used for polyurethane are toxic and hygroscopic in nature. In the present work, an alternate approach was adopted, a reaction between the unsaturated rubber having an α-methylene hydrogen atom and a dinitrosobenzene (DNB) - generating system (quinol ether of 1,4-benzoquinone dioxime, QE) without a catalyst, thus generating a cured system. QE is a novel curing agent for propellant applications which imparts the necessary curing. The curing reaction between nitrile butatadiene rubber (NBR) and quinol ether (QE) was studied by FTIR and the results revealed the formation of anil groups (Ar–C=N). The anil group results from the reaction between NBR and DNB, generated on decomposition of QE. Propellant formulations were prepared with variation of the curing agent from 0.2 to 0.5%. The composition and rheological, mechanical, ballistic and thermal properties of the resulting cured systems were investigated. The viscosity and spreadability were suitable for casting. The tensile strength, modulus, and hardness show an increasing trend and the elongation decreases on varying QE from 0.2 to 0.5% in the propellant. However, all of the compositions showed nearly the same burning rate and pressure exponent. The QE based curing system is non-hygroscopic and has extremely low toxicity. The experimental results revealed that the proposed curing agent may find application in explosives and propellants.
    Źródło:
    Central European Journal of Energetic Materials; 2022, 19, 1; 18--38
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies on the High Performance Characteristics of an Aluminized Ammonium Perchlorate Composite Solid Propellant Based on Nitrile Butadiene Rubber
    Autorzy:
    Sudhir, Singh
    Sidharth, Raveendran
    Dhirendra, Kshirsagar R.
    Gupta, Manoj
    Chetan, Bhongale
    Powiązania:
    https://bibliotekanauki.pl/articles/27787902.pdf
    Data publikacji:
    2021
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    composite solid propellant
    dibutyl phthalate
    high density specific impulse
    nitrile-butadiene rubber
    pot life
    spreadibility
    yield stress
    Opis:
    n the present study, a high performance composite solid propellant formulation was prepared based on nitrile butadiene rubber (NBR) and dibutyl phthalate (DBP) plasticizer, which has a longer pot life and high density specific impulse. The developed cost effective novel binder system was prepared with readily available raw materials (NBR and DBP). The formulation of the composition was performed by varying the content of the NBR/DBP binder in the range of 14-20%. The rocket performance characteristics were determined theoretically using PROPEP and compared with those of an HTPB based propellant. The rheological, mechanical, physical, ballistic and thermal properties of the NBR/DBP propellant were studied and compared with literature data for similar compositions based on an HTPB/dioctyl adipate (DOA) binder. The yield stress was determined by spreadibilty measurements, and indicated the superiority of this binder based propellant over existing composite propellants. It was concluded that following decreasing the content of the NBR/DBP binder in the propellant from 20 to 14%: in the range 58.83-78.45 bar (5.883-7.845 MPa), the pressure index increased from 0.159 to 0.371, – at 68.64 bar (6.864 MPa), the burning rate increased from 4.10 to 6.54 mm/s, but the theoretical specific impulse value did not change significantly (258.0259.8 s), – the tensile strength and E-modulus increased from 6.03 to 9.88 (0.591-0.969) to and from 18.00 to 75.00 kgf/cm2 (1.765 to 7.355 MPa), respectively. Moreover, a DSC and TGA study indicated a lower decomposition temperature for the NBR/DBP propellant compared to the HTPB propellant. The NBR/DBP propellant exhibited a pot life more than double that of a conventional HTPB/ DOA based propellant.
    Źródło:
    Central European Journal of Energetic Materials; 2021, 18, 4; 492--511
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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