Autor: Mishra, P.K. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Effect of visible light on the process of accelerated oxidation of dye contained in red paprika powder
Wpływ światła widzialnego na proces przyspieszonego utleniania barwnika zawartego w proszku z czerwonej papryki
Autorzy:: Ekielski, A.
Klepacka, A.M.
Mishra, P.K.
Shivani, Shivani
Powiązania:: https://bibliotekanauki.pl/articles/950817.pdf
Data publikacji:: 2013
Wydawca:: Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:: visible light
accelerated oxidation
dye
red pepper
pepper powder
Opis:: Effect of visible light on the process of accelerated oxidation of dye contained in red paprika powder. The effect of temperature and visible light intensity on changes in ground paprika colour was investigated. In determination of changes in colour parameters there were used the colour space L*. a*, b*, the total colour change TCD and sample whiteness index WI. Investigations were carried out at three lighting intensity levels of D65 light (6000, 4500, 0 lx) at storage temperature (30º, 40º, 50ºC). The DOE model for investigation planning included in Statistica Program was used in investigations. The validation investigations were carried out to verify the model. Colour changes in the investigated samples were connected, first of all, with their lighting intensity and less so with storage temperature. A two-stage process of colour changes in the samples illuminated with the light of intensity 6000 lx was found. The carried out investigations can be used in predicting the time of changes in colour parameters of ground paprika exposed to intense radiation in the range of visible light.
Wpływ światła widzialnego na proces przyspieszonego utleniania barwnika zawartego w proszku z czerwonej papryki. W pracy badano wpływ temperatury i natężenia światła widzialnego na zmiany barwy mielonej papryki. Do określenia zmian parametrów barwy wykorzystano przestrzeń barw L*, a*, b* oraz całkowita zmianę barwy TCD, wskaźnik białości próbki WI. Badania przeprowadzono dla trzech poziomów intensywności oświetlenia światłem D65 (6000, 4500, 0 lx) w temperaturze przechowywania (30°, 40°, 50°C). W badaniach wykorzystano model planowania badań DOE zawarty w Programie Statistica. W celu weryfikacji modelu przeprowadzono badania walidacyjne. Zmiany barwy badanych próbek były związane przede wszystkim z intensywnością ich oświetlania, w mniejszym stopniu z temperaturą przechowywania. Zaobserwowano dwuetapowy proces zmiany barwy dla próbek oświetlonych światłem intensywności 6000 lx. Przeprowadzone badania mogą być wykorzystane do przewidywania czasu zmian parametrów barwy zmielonej papryki wystawionej na działanie intensywnego promieniowania w zakresie światła widzialnego.
Źródło:: Annals of Warsaw University of Life Sciences - SGGW. Agriculture; 2013, 61 Agric.Forest Eng.
0208-5712
Pojawia się w:: Annals of Warsaw University of Life Sciences - SGGW. Agriculture
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Nanofluid motion past a shrinking sheet in porous media under the impact of radiation and heat source/sink
Autorzy:: Sharma, R. P.
Jha, A. K.
Gaur, P. K.
Mishra, S. R.
Powiązania:: https://bibliotekanauki.pl/articles/264665.pdf
Data publikacji:: 2019
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: magnetohydrodynamika
promieniowanie cieplne
wytwarzanie ciepła
MHD
nanofluid
shrinking surface
thermal radiation
heat generation
porous medium
Opis:: An investigation has been carried out for the MHD 3-dimensional flow of nanofluid over a shrinking sweet saturating a porous media in the presence of thermal radiation and heat generation. Convective boundary conditions for the flow phenomena are used in the present analysis. The governing equations are reduced to ODEs employing suitable similarity transformations. The solutions of formulated differential equations have been attained mathematically by fourth order R-K technique along with the shooting method. The impact of the governing constraints on momentum, heat, and local Nusselt number, are explored. It is noticed that the momentum and heat decrease with raise in the porosity variable, temperature reduces with an enhance in the thermal radiation variable, and temperature enhances with an enhance in the heat source/sink parameter.
Źródło:: International Journal of Applied Mechanics and Engineering; 2019, 24, 4; 183-199
1734-4492
2353-9003
Pojawia się w:: International Journal of Applied Mechanics and Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Study of air flow pattern in mine model gallery and its validation using CFD modelling
Autorzy:: Biswal, P. K.
Parida, D.
Mishra, G.
Sahoo, A. K.
Powiązania:: https://bibliotekanauki.pl/articles/1066257.pdf
Data publikacji:: 2019
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: k– model
Opis:: Several turbulence models have been urbanized in the past decades, and many of them have been used in predicting airflows and turbulence in enclosed environments. It is vital to approximate the generality and heftiness of the turbulence models for various indoor airflow scenarios in various sections. The present work developed the geometry of the mine model gallery using CATIA version V5R20. It carried out air flow simulation for different inlet velocities and studied the air flow velocity through the section by grid section method and traverse method. An artificial flow regulator was created to study the flow behaviour and calculated Reynolds’s no at bends and turns to characterize the air flow. In this model the turbulence has also been calculated and the zone of turbulence is being located using Ansys fluent. The model was validated by comparing the results of the readings of the actual mine model gallery and by means of mass flow rate at different sections to establish a CFD model for mine gallery and validation of the results of flow behaviour, viz. air velocity, pressure profile, and determination of zone of turbulence of mine model gallery developed using Ansys 18.2.
Źródło:: World Scientific News; 2019, 130; 1-24
2392-2192
Pojawia się w:: World Scientific News
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Chatter detection using principal component analysis in cold rolling mill
Autorzy:: Usmani, N. I.
Kumar, S.
Velisatti, S.
Tiwari, P. K.
Mishra, S. K.
Patnaik, U. S.
Powiązania:: https://bibliotekanauki.pl/articles/329460.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:: chatter
principal component analysis
PCA
cold rolling
vibration
drgania samowzbudne
analiza składowych głównych
walcowanie na zimno
drgania
Opis:: Most cold rolling mills are prone to chatter problem. Chatter marks are often observed on the strip surface in cold rolling mill leading to downgrade and rejection of rolled material. Chatter impact product quality as well as productivity of mill. In absence of online chatter detection no corrective action can be taken immediately and whole campaign gets affected. Most conventional approach for online chatter detection is by using vibration measurement of mill stands in time & frequency domain. Present work proposes two approaches to detect chatter in cold rolling mill using a statistical technique called Principal Component Analysis (PCA). In this paper two methods are used for chatter detection. First method applies PCA on Fast Fourier Transform (FFT) to differentiate between chatter and non-chatter condition. Second method applies PCA on statistical parameters calculated from raw vibration data to detect chatter.
Źródło:: Diagnostyka; 2018, 19, 1; 73-81
1641-6414
2449-5220
Pojawia się w:: Diagnostyka
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Spatial and temporal precipitation trends of proposed smart cities based on homogeneous monsoon regions across India
Autorzy:: Singh, Lakhwinder
Khare, Deepak
Mishra, Prabhash K.
Pingale, Santosh M.
Thakur, Hitesh P.
Powiązania:: https://bibliotekanauki.pl/articles/1844405.pdf
Data publikacji:: 2020
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: smart city
trend
modified Mann–Kendall test
MMK
monsoon homogeneous regions
India
Opis:: The conservation of rainwater and augmentation of groundwater reserve is necessary to meet the increased water demands. Precipitation occurring in the smart cities need to be understood for a better water management action plan. Therefore, monotonic precipitation trend analysis was performed for eight smart cities drawn from six monsoon homogeneous regions across India. The precipitation data were investigated for trends using the modified Mann–Kendall (MMK) test and Sen’s slope estimator at annual, seasonal and monthly scales. The trend analysis was carried out over 118 years (from 1901 to 2018) at 95% significance level. The Dehradun city (Northern Himalayan region) showed a significant increasing annual precipitation trend (Z = +3.22). Indore and Bhopal cities from West Central region showed significant increasing annual trend (Z = +2.01) and non-significant decreasing annual trend respectively. Although, Vadodara and Jaipur are lying in the same Northwest region, the trends are opposite in nature. Jaipur city showed a significant increasing annual pre-monsoon trend (Z = +2.44). The winter rainfall in the city of Vadodara is showing a significant decreasing trend (Z = –2.16). The pre-monsoon rainfall in Bhubaneswar (Central Northeast region) and monsoon precipitation in Trivandrum (Peninsular region) are showing significant increasing (Z = +2.56) and decreasing (Z = –2.71) trends, respectively. A non-significant decreasing trend was seen in Guwahati city (Northeast region). The eight smart cities selected for investigation are not truly representing the entire country. However, the study is clearly pointing towards the regional disparity existing in the coun-try. These findings will be helpful for water managers and policymakers in these regions for better water management.
Źródło:: Journal of Water and Land Development; 2020, 47; 150-159
1429-7426
2083-4535
Pojawia się w:: Journal of Water and Land Development
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Application of a particle swarm optimization to a physically-based erosion model
Zastosowanie optymalizacji zbioru rozproszonych czasteczek do modelu erozji opartego na podstawach fizycznych
Autorzy:: Santos, C A G
Pinto, L.E.M.
De Macedo Machado Freire, P.K.
Mishra, S.K.
Powiązania:: https://bibliotekanauki.pl/articles/81761.pdf
Data publikacji:: 2010
Wydawca:: Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:: particle swarm optimization
application
erosion model
erosion simulation
run-off
optimization
erosion parameter
Opis:: The difficulties involved in calibration of physically based erosion models have been partly attributable to the lack of robust optimization tools. This paper presents the essential concepts and application to optimize channel and plane parameters in an erosion model, with a global optimization method known as Repulsive Particle Swarm (RPS), a variant of Particle Swarm Optimization (PSO) method. The physically-based erosion model that which was chosen is called WESP (watershed erosion simulation program). The optimization technique was tested with the field data collected in an experimental watershed located in a semi-arid region of Brazil. On the basis of these results, the recommended erosion parameter values for a semi-arid region are given, which could serve as an initial estimate for other similar areas.
Trudności w kalibracji modeli erozji opartych na podstawach fizycznych przyczyniły się do braku ogólnych narzędzi optymalizacji. W pracy przedstawiono podstawowe koncepcje i zastosowanie do zoptymalizowania parametrów kanału i płaszczyzny w modelu erozji, globalną metodą optymalizacji znaną jako Repulsive Particle Swarm (RPS), wariantem metody Particle Swarm Optimisation (SPO). Fizycznie uzasadniony model erozji, który został wybrany jest nazywany WESP (watershed erosion simulation program). Technika optymalizacji została wypróbowana na danych terenowych zebranych w zlewni eksperymentalnej zlokalizowanej w umiarkowanie suchym regionie Brazylii. Na podstawie tych wyników przedstawiono wartości rekomendowanego parametru erozji dla umiarkowanie suchego regionu, który może służyć jako początkowe oszacowanie dla podobnych obszarów.
Źródło:: Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation; 2010, 42, 1; 39-49
0208-5771
Pojawia się w:: Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Obstructive sleep apnea risk for driving license applicants in India – A community based study
Autorzy:: Dubey, Abhishek
Bajaj, Darshan K.
Mishra, Apurva
Singh, Balendra P.
Gupta, Vinay
Kant, Surya
Dixit, Swati
Powiązania:: https://bibliotekanauki.pl/articles/2161795.pdf
Data publikacji:: 2017-10-18
Wydawca:: Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:: obstructive sleep apnea
drivers
sleepiness
road traffic accidents
STOP-Bang
high blood pressure
Opis:: Objectives: To determine the risk of obstructive sleep apnea (OSA) for male permanent driving license (DL) applicants of Lucknow, India. Material and Methods: In this cross-sectional community based, study body mass index, waist–hip ratio, blood pressure of each subject were determined as an anthropometric parameter along with the history of habit of smoking, tobacco chewing, alcohol consumption. STOP-Bang (Snoring, Tired or sleepy, Observed apnea, high blood Pressure, Body mass index, Age, Neck, Gender) Questionnaire – a scoring risk assessment tool – was applied for assessment of OSA risk (high OSA risk defined by score ≥ 3) for 542 male DL recipients at 2 Regional Transport Office (RTO) centers in Lucknow, India. The statistical software SPSS 17.0 was applied to the testing. Results: In total 23% (N = 125) of participants were found with the risk of OSA. High blood pressure (≥ 140/90 mm Hg) was found for the maximum number of participants (40.5%) followed by neck circumference > 40 cm (17.1%), age (> 50 years old) (15.3%), snoring (12.3%) and tired/sleepy (10.5%). Mean values of age, anthropometric measurements and blood pressure were observed significantly higher (p < 0.001) for participants with the OSA risk. In this population the risk of OSA risk (STOP-Bang score ≥ 3) was observed for 6.7% of young (< 35 years old), 34% of middle (35–45 years old) and 73% of elder age adults (> 45 years old). Conclusions: In view of findings of this study a high number of male driving license applicants were observed with the risk of OSA. Therefore efforts should be made to develop a national screening guideline/protocol for the OSA risk assessment for driving license applicants in India. This may reduce the possibility of road traffic accidents due to the OSA-associated fatigue and drowsiness behind the wheels. Int J Occup Med Environ Health 2018;31(1):25–36
Źródło:: International Journal of Occupational Medicine and Environmental Health; 2018, 31, 1; 25-36
1232-1087
1896-494X
Pojawia się w:: International Journal of Occupational Medicine and Environmental Health
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: An extension of line spring model for vibration analysis of thin isotropic plate containing multiple part-through cracks: an analytical approach
Autorzy:: Jain, N. K.
Gupta, A.
Salhotra, R.
Rawani, A. M.
Soni, S.
Mishra, A.
Joshi, P. V.
Powiązania:: https://bibliotekanauki.pl/articles/128046.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:: multiple cracks
Line Spring Model
vibration
partial crack
pęknięcie wielokrotne
sprężyna liniowa
drgania
pęknięcie częściowe
Opis:: In the present study, the effect of multiple part-through cracks on the vibration characteristics of thin isotropic rectangular plate is presented. The proposed analytical model is developed using Kirchhoff’s classical plate theory and the crack terms are formulated using the simplified Line Spring Model (LSM). The application of Berger's formulation helps to transform the derived governing equation in the form of well known Duffing equation with cubic nonlinearities and then the solution for final governing equation is obtained using Galerkin's method for two different boundary conditions. The fundamental frequency of the plate as affected by the number of cracks, cracks length, cracks orientation, and plate aspect ratio for different boundary condition is presented. It is found that the results obtained for natural frequencies are maximally affected by number of cracks, crack length and orientations.
Źródło:: Vibrations in Physical Systems; 2018, 29; 1-25
0860-6897
Pojawia się w:: Vibrations in Physical Systems
Dostawca treści:: Biblioteka Nauki

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