Autor: Singh, G. N. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Studies on High Burning Rate Composite Propellant Formulations using TATB as Pressure Index Suppressant
Autorzy:: Mehilal, -
Jawalkar, S.
Kurva, R.
Sundaramoorthy, N.
Dombe, G.
Singh, P. P.
Bhattacharya, B.
Powiązania:: https://bibliotekanauki.pl/articles/951502.pdf
Data publikacji:: 2012
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:: composite propellant
ammonium perchlorate
TATB
pressure index suppressant
Opis:: High burning rate propellant compositions are generally used in gas generators to eject missile from canister. Because of high burning rate, pressure index of the composition increases during burning. To reduce the pressure index, a high burning rate composite propellant formulations (~20 mm/s) based on AP/HTPB/Al have been prepared by incorporating TATB and studied in detail for viscosity build-up, thermal and mechanical properties, sensitivity as well as burning rate and pressure index (n). The data indicate that there is a decrease in end of mix viscosity on increasing the percentage of TATB. The same trend was also observed with mechanical properties while significant improvement in overall thermal stability was clearly observed. The sensitivity data indicate that impact and friction values show decreasing trend infer better safe to handle. The burn rate data reveal that on addition of TATB from 0.5 to 2% decrease in burning rate was not observed while on addition of further TATB up to 5% and beyond this significant decrease in burning rate was observed. The data on pressure index (n) also reveal that TATB is very effective in reducing the 'n' value up to 2% and beyond this 'n' value increases close to standard composition. The data on 'n' value reveal that it reduces from 0.47 to that of standard composition to 0.36 for the compositions containing TATB up to 2.0% in the pressure range of 60-90 kg/cm2.
Źródło:: Central European Journal of Energetic Materials; 2012, 9, 3; 237-249
1733-7178
Pojawia się w:: Central European Journal of Energetic Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: A study into occurrence of fire in opencast workings over developed coal pillars and evolving control parameters for its safe extraction
Badanie przypadku wystąpienia pożaru w wyrobiskach odkrywkowych ponad udostępnianymi filarami węglowymi i opracowanie parametrów kontrolnych dla zapewnienia ich bezpiecznego wydobycia
Autorzy:: Panigrahi, D.
Sinha, S. K.
Singh, G. N.
Powiązania:: https://bibliotekanauki.pl/articles/219289.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: prowadzenia odkrywki powyżej filarów podziemnych udostępnionych metodą filarowo-komorową
parametry krytyczne określające możliwość wystąpienia pożaru
parametry górnicze
przegląd krytyczny
parametry związane z wydobyciem
przedział ufności
analiza wariancji
opencast over underground bord and pillars
critical to fire
mining parameters
critical review
mine operational parameters
confidence interval and analysis of variance
Opis:: In India, a number of opencast mines are being worked over the coal pillars developed by underground bord and pillar method of mining. In these cases, the fires have occurred in most of these opencast mines causing loss of the coal reserve, production, productivity and safety. In this research work, 13 such mines have been studied over a period of three years and critical parameters for occurrence of these fires have been identified. This paper presents the details of observations for two such mines and detailed statistical analyses have been carried out by using confidence interval (C.I.) and analysis of variance (ANOVA-Two-way classification) for finding out the range of these critical parameters which can be controlled to reduce the occurrence of these fires.
W wielu kopalniach odkrywkowych w Indiach wydobycie prowadzi się w wyrobiskach ponad filarami ochronnymi udostępnianymi przy wykorzystaniu metody filarowo-komorowej. W takich warunkach powstające często w kopalniach pożary powodują utratę zasobów węglowych, zmniejszenie wydajności i poziomu wydobycia oraz negatywnie wpływają na bezpieczeństwo pracy. W artykule tym przeanalizowano przypadki 13 kopalni odkrywkowych na przestrzeni trzech lat, zidentyfikowano krytyczne parametry dla określenia możliwości wystąpienia pożaru. Artykuł przedstawia dokładne obserwacje poczynione w dwóch kopalniach, poparte szczegółową analizą statystyczną z zastosowaniem przedziałów ufności i analizy wariancji (ANOVA - klasyfikacja dwukierunkowa) do określenia wartości parametrów krytycznych w celu zminimalizowania ryzyka wystąpienia pożarów.
Źródło:: Archives of Mining Sciences; 2013, 58, 4; 1145-1162
0860-7001
Pojawia się w:: Archives of Mining Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Applications of Some Well-Known Skewed Distributions to Greenhouse Gas Emissions Data
Autorzy:: Shakil, M.
Singh, J. N.
Kibria, B. M. G.
Khadim, A.
Ahsanullah, M.
Powiązania:: https://bibliotekanauki.pl/articles/1839385.pdf
Data publikacji:: 2021
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Goodness of fit test
Greenhouse gas emissions
Probability distributions
Statistical analysis
Opis:: In many problems of transportation and environmental processes and designs, fitting of a continuous probability distribution to the greenhouse gas emissions data from cars may be helpful in predicting the probability or forecasting the frequency of occurrence of the greenhouse gas emissions from burning fossil fuel for our cars, trucks, ships, trains, and planes, and planning beforehand. The objective of this paper is to study and conduct a statistical analysis of the greenhouse gas emissions data from cars. Since our data are skewed in nature, we fit the following well known skewed distributions: 3 parameter Birnbaum-Saunders (or fatigue-life), gamma, 3 parameter gamma, generalized extreme value, 3 parameter lognormal, 4 parameter Pearson 6 and Weibull distributions. We have tested the goodness of fit these distributions to a random sample of the greenhouse gas emissions data from 32 different models of cars to determine their applicability and best fit to these data based on the Kolmogorov-Smirnov, Anderson-Darling, and Chi-Squared Goodness-of-Fit Tests.
Źródło:: World Scientific News; 2021, 162; 1-15
2392-2192
Pojawia się w:: World Scientific News
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Investigations on Chemical, Thermal Decomposition Behavior, Kinetics, Reaction Mechanism and Thermodynamic Properties of Aged TATB
Autorzy:: Singh, A.
Kaur, G.
Sarkar, C.
Mukherjee, N.
Powiązania:: https://bibliotekanauki.pl/articles/357970.pdf
Data publikacji:: 2018
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:: 1,3,5-triamino-2,4,6-trinitrobenzene
thermal decomposition
kinetics
thermodynamics
Opis:: 1,3,5-triamino-2,4,6-trinitrobenzene (TATB) is a kind of insensitive high explosive that can be used as an energetic material in nuclear weapon and space applications. In this work, we have studied the effect of aging on the properties of TATB from a 20 year old lot that had been in direct contact with casing and natural environment conditions. The kinetics was studied using the temperature at the maximum reaction rate (peak) and isoconversional methods from TGA and DTA data obtained at five heating rates under a nitrogen atmosphere. The properties investigated for thermal stability indicate that there is no change in the properties during prolonged exposure in natural environment conditions. The activation energy calculated by the Kissinger method was 179.9 kJ·mol−1 by DTG and the 176.9 kJ·mol−1 by DTA. The experimental results of kinetic analysis obtained by isoconversional methods are in good agreement and very close to each other. In the analysis of reaction mechanisms, the reaction models could be probably best described by a surface contraction mechanism using the Coats-Redfern and Criado methods. The thermodynamic parameters such as Gibbs free energy, enthalpy and entropy of activation were also investigated. The self-accelerating decomposition temperature (TSADT) and critical temperature for thermal explosion (Tb) were also calculated.
Źródło:: Central European Journal of Energetic Materials; 2018, 15, 2; 258-282
1733-7178
Pojawia się w:: Central European Journal of Energetic Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Best Linear Unbiased Estimators of Population Mean on Current Occasion in Two-Occasion Rotation Patterns
Autorzy:: Singh, G. N.
Prasad, S.
Powiązania:: https://bibliotekanauki.pl/articles/465782.pdf
Data publikacji:: 2013
Wydawca:: Główny Urząd Statystyczny
Tematy:: successive sampling
auxiliary information
unbiased
variance
optimum replacement policy
Opis:: Best linear unbiased estimators have been proposed to estimate the population mean on current occasion in two-occasion successive (rotation) sampling. Behavior of the proposed estimators have been studied and their respective optimum replacement policies are discussed. Empirical studies are carried out to examine the performance of the proposed estimators and consequently the suitable recommendations are made.
Źródło:: Statistics in Transition new series; 2013, 14, 1; 57-74
1234-7655
Pojawia się w:: Statistics in Transition new series
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Some Effective Estimation Procedures Under Non- Esponse in Two-Phase Successive Sampling
Autorzy:: Singh, G. N.
Khetan, M.
Maurya, S.
Powiązania:: https://bibliotekanauki.pl/articles/465962.pdf
Data publikacji:: 2016
Wydawca:: Główny Urząd Statystyczny
Tematy:: non-response, successive sampling two-phase sampling
mean square error
optimum replacement strategy
Opis:: This work is designed to assess the effect of non-response in estimation of the current population mean in two-phase successive sampling on two occasions. Sub-sampling technique of non-respondents has been used and exponential methods of estimation under two-phase successive sampling arrangement have been proposed. Properties of the proposed estimation procedures have been examined. Empirical studies are carried out to justify the suggested estimation procedures and suitable recommendations have been made to the survey practitioners.
Źródło:: Statistics in Transition new series; 2016, 17, 2; 163-182
1234-7655
Pojawia się w:: Statistics in Transition new series
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Some Rotation Patterns in Two-Phase Sampling
Autorzy:: Singh, G. N.
Prasad, Shakti
Powiązania:: https://bibliotekanauki.pl/articles/465915.pdf
Data publikacji:: 2011
Wydawca:: Główny Urząd Statystyczny
Tematy:: Two-phase, successive sampling
auxiliary information
chain-type
bias
mean square error
optimum replacement policy
Opis:: A problem related to the estimation of population mean on the current occasion using two-phase successive (rotation) sampling on two occasions has been considered. Two-phase ratio, regression and chain-type estimators for estimating the population mean on current (second) occasion have been proposed. Properties of the proposed estimators have been studied and their respective optimum replacement policies are discussed. Estimators are compared with the sample mean estimator, when there is no matching and the natural optimum estimator, which is a linear combination of the means of the matched and unmatched portions of the sample on the current occasion. Results are demonstrated through empirical means of comparison and suitable recommendations are made.
Źródło:: Statistics in Transition new series; 2011, 12, 1; 25-44
1234-7655
Pojawia się w:: Statistics in Transition new series
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Optical Investigation of the Cu Ions Diffusion into Bulk Lithium Niobate
Autorzy:: Sugak, D.
Syvorotka, I.
Yakhnevych, U.
Buryy, O.
Martynyuk, N.
Ubizskii, S.
Zhydachevskyy, Ya.
Suchocki, A.
Kumar, H.
Janyani, V.
Singh, G.
Powiązania:: https://bibliotekanauki.pl/articles/1030967.pdf
Data publikacji:: 2018-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 66.30.-h
78.20.-e
Opis:: Spatial changes of optical properties of bulk LiNbO₃ crystal were investigated after annealing in CuO powder. The incorporation of copper ions into the crystal was confirmed by registration of additional absorption spectra that revealed formation of the absorption bands of both Cu⁺ (400 nm) and Cu²⁺ (1000 nm) ions. The changes of optical absorption caused by thermal treatment were registered along the direction of diffusion by the probe beam perpendicular to this direction. The anisotropy of diffusion was revealed. The maxima were observed on the depth dependences of additional absorption both for the wavelengths of 400 and 1000 nm for all main crystallographic directions. The concentrations of copper ions were calculated in accordance with the Smakula-Dexter formula. The X-ray diffraction study revealed reflexes which probably belong to CuNb₂O₆, CuNbO₃ and CuO. The halo was observed on these diffraction patterns that confirms the formation of the scattering centers (about 1 nm in diameter) in the near-surface region.
Źródło:: Acta Physica Polonica A; 2018, 133, 4; 965-972
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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