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Wyszukujesz frazę "Kumar, S." wg kryterium: Autor


Wyświetlanie 1-10 z 10
Tytuł:
Homotopy Perturbation Method of Hydromagnetic Flow and Heat Transfer of a Casson Fluid over an Exponentially Shrinking Sheet
Autorzy:
Murugesan, Thiagarajan
Varshini, S.
Kumar, M. Dinesh
Powiązania:
https://bibliotekanauki.pl/articles/1031915.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Casson Fluid
Homotopy Perturbation method
MHD
Runge-Kutta method
suction
Opis:
Nonlinear hydromagnetic flow and heat transfer of a Casson fluid over an exponentially shrinking sheet has been investigated. The fluid is assumed to be viscous, incompressible and electrically conducting. The similarity transformations are applied to reduce the non-linear partial differential equations into the non-linear ordinary differential equations. Homotopy Perturbation Method is used to solve the resulting non-linear differential equations under appropriate boundary conditions. The impact of Casson fluid parameter, magnetic interaction parameter, suction parameter and Prandtl number on both velocity and temperature profiles are shown graphically. Thermal boundary layer thickness decreases with increasing Prandtl number. Effect of Casson fluid parameter is to reduce both the velocity and temperature. Quantities of physical interest such as skin-friction coefficient, non-dimensional rate of heat transfer are solved numerically. A comparison reveals a remarkable agreement between the Homotopy Perturbation Method and Runge-Kutta fourth order method.
Źródło:
World Scientific News; 2020, 140; 59-78
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatial Distribution of Rainfall with Elevation in Satluj River Basin: 1986-2010, Himachal Pradesh, India
Autorzy:
Kumar, Sandeep
Gil, G. S.
Santosh, Santosh
Powiązania:
https://bibliotekanauki.pl/articles/1193947.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
DEM
GIS
Himalayas
Interpolation
Orographic effect
Precipitation
Satluj River Basin
Opis:
The complex relationship between topography and precipitation in mountainous regions such as Himalayas is evident from the pattern of rainfall distribution. The variation in precipitation with altitude is controlled by mean height of clouds and decrease in water vapours with altitude. Spatially distributed measurements of precipitation have gained renewed interest in connection with climate change impact studies. Precipitation values are usually available from a limited number of gauge stations and their spatial estimates can be obtained by interpolation techniques such as Inverse Distance Weighted (IDW), Kriging and Spline. In the present study, precipitation-elevation relationship can be established using Digital Elevation Model (DEM) (Advanced Spaceborne Thermal Emission and Reflection Radiometer-ASTER, 30m resolution), Spline interpolation technique in Geographical Information System (GIS) environment and point data from various gauge stations spread over the Satluj River Basin. Changes of spatial distribution of precipitation with elevation show a distinct shift. Bhakra Dam (5854.60 mm) to Rampur (4451.10 mm), there is continuous variation in rainfall with increase in altitude. But beyond Rampur, variation is very high. Swarghat shows exceptional rainfall (8031.76 mm), may be due to position of mountains and their orographic effects. Maximum rainfall was observed in the lower Himalayas i.e. Shiwalik range. Negligible rainfall was observed beyond Kaza (470 mm), above the elevation of around 3756 m. The general trend of rainfall exhibits that the lower and middle parts experience good rainfall whereas the upper part experiences less rainfall. Such spatial and temporal distribution of rainfall with elevation provides an important platform for hydrologic analysis, planning and management of water resources.
Źródło:
World Scientific News; 2015, 19; 1-15
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Trend analysis of rainfall in Satluj River Basin, Himachal Pradesh, India
Autorzy:
Kumar, Sandeep
Gill, G. S.
Santosh, Santosh
Powiązania:
https://bibliotekanauki.pl/articles/1193980.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Himachal Pradesh
Mann-Kendall test
Rainfall
Regression
Satluj River Basin
Trend analysis
Opis:
attention recently, especially in connection with climate change. The changing pattern of rainfall deserves urgent and systematic attention for planning, development, utilisation and management of water resources. The daily data on variable were converted to monthly and then computed to seasonal and annual series. Annual rainfall (mm/yr) was calculated as the sum of monthly values. The missing values in the data were computed by using average method. The records of rainfall were subjected to trend analysis by using both non-parametric (Mann-Kendall test) and parametric (linear regression analysis) procedures. For better understanding of the observed trends, data were computed into standardised precipitation indices (SPI). These standardised data series were plotted against time and the linear trends observed were represented graphically. Trend analysis results of rainfall show that out of 15 annual trends 6 (40%) are increasing and 9 (60%) are decreasing in nature where 1 (6.6%) is statistically significant (increasing) and 2 (13.3%) are statistically significant (decreasing) at 95% confidence level. Similarly, the changes were investigated for the four seasons: winter (December-March), pre-monsoon (April-June), monsoon (July-September) and post-monsoon (October-November). The analysis of rainfall, annual as well as seasonal, of different gauge stations in Satluj River Basin showed a large variability in the trends and magnitudes from 1984 to 2010. The rainfall shows great temporal and spatial variations, unequal seasonal distribution with frequent departures from normal. Majority of gauge stations have experienced decreasing trends, both on seasonal and annual scales. Some were statistically significant at 95% confidence level. The sensitivity of rainfall variations provides important insight regarding the responses and vulnerability of different areas to climate change. It will further strengthen the formulation of future strategy for management of water resources.
Źródło:
World Scientific News; 2015, 14; 1-55
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Condition Monitoring of Rotating Machines: A Review
Autorzy:
Goyal, Deepam
Chaudhary, Anurag
Dang, Rajeev Kumar
Pabla, B. S.
Dhami, S. S.
Powiązania:
https://bibliotekanauki.pl/articles/1159447.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Condition monitoring
fault detection
motor current signature analysis
wireless monitoring
Opis:
An uninterrupted health monitoring of machine is essential in various applications where failure of machine leads to loss of quality control, productivity and safety against catastrophic failure. Condition monitoring of machine involves continuous assessment on the performance of rotating components i.e. bearings, gears and motors and anticipating the faults before it cause any adversity. Rotating machines are commonly used in the industry for different applications such as railways, pumps, conveyors, blowers, elevator, mining industry, etc. Condition monitoring of rotating machines has been an important task for technicians, engineers, and researchers mainly to enhance structural reliability in a real time. This paper presents an enlarged survey on the expansion and the recent approaches in the condition monitoring of rotating machines. In current scenario, condition monitoring has proved their ability for fault detection of incipient faults in mechanical machines and equipments. Several techniques such as vibration monitoring, acoustic emission monitoring, invasive monitoring, oil monitoring are available for determining the health of rotating machines but all these monitoring methods needs expensive transducers and sensors.
Źródło:
World Scientific News; 2018, 113; 98-108
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mucocele – A benign lesion of accessory salivary gland
Autorzy:
Chengappa, Dewan
Vijayendranath, Nayak S.
Raghavendra, Kini
Prasanna, Kumar Rao J.
Boricha, Vishal Kumar
Manjunath, Rai
Powiązania:
https://bibliotekanauki.pl/articles/1157168.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Diagnosis
excision
lower lip
minor salivary glands
mucocele
Opis:
Mucoceles are the most common soft tissue lesions seen in the oral cavity. They usually occur due to injury to the minor salivary glands. Spontaneous regression of mucocele can happen if its superficial or else surgical excision is recommended. Herein we report a case of oral mucocele of lower labial mucosa.
Źródło:
World Scientific News; 2018, 94, 2; 305-307
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On Nigerian and Indian Toponyms: Socio-Cultural Divergence and Development
Autorzy:
Oha, Anthony C.
Kumar, Bachchan
Anyanwu, Bibian
Omoera, Osakue S.
Powiązania:
https://bibliotekanauki.pl/articles/1179271.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
English
India
Language development
Nigeria
Socio-cultural divergence
Toponyms/Place-names
Opis:
In onomastic studies, toponyms are defined as place-names or names given to geographical locations which include towns, streets, and tourist centres. It is pertinent to note that India and Nigeria were both British colonies. Thus, English is placed as the official language of business and politics in both countries. However, Indians were quick to understand the power of language, due to the philosophical influence of Mahatma Gandhi, which enabled them to embrace Hindi language early, as a second official language. Deploying onomastics, semiotics, interpretative approach to translation, text analysis and cultural studies, we have selected one hundred (100) toponyms from different parts of India and Nigeria and analysed them in order to show the development of place-names in both countries in the new millennium. In Nigeria, the influence of British English is everywhere in the names of cities, towns, villages, streets, tourist centres, rivers, including ‘Douglas Road’, ‘Wetheral Road’, ‘Owerri’ instead of ‘Owere’, ‘Awka’ instead of ‘Oka’, ‘Warri instead of ‘Wori,’ among others. In India, however, we see indigenized naming forms such as ‘Tilak Nagar’, ‘Mahavir Nagar’, ‘Rama Krishna Ashram Marg’ and ‘Rajiv Chowk’. English language in India is fast dying, while in Nigeria, the reverse is the case. The conclusion reached is that while India is making serious efforts towards a complete linguistic independence, through the development of place-names, Nigeria is promoting anglicised place- names, which is detrimental to the development of indigenous Nigerian languages.
Źródło:
World Scientific News; 2017, 80; 268-283
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Voltage Security Assessment of Power System
Autorzy:
Chowdhury, Amit Kumar
Mondal, Surajit
Alam, S. K. Mehboob
Pal, Jagadish
Powiązania:
https://bibliotekanauki.pl/articles/1193939.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
1P-1Q Method
Fast Decoupled Load flow
Voltage Collapse
Voltage Performance index
Voltage Stability
Voltage insecurity
Opis:
This paper deals with the security aspects of power system by evaluating the severity of transmission line outage. Voltage security assessment is made by determining the power flow in the line using load flow for each contingency. The severity of contingency is measured using a scalar index called Voltage performance index. 1P-1Q Method and Fast Decoupled load flow are used as approximate and exact load flow methods for Voltage security assessment respectively. Contingency analysis is carried out and ranked lists in the decreasing order of severity based on Voltage Performance Index values are prepared for standard test systems. The severity of line is evaluated and compared using these load flow methods.
Źródło:
World Scientific News; 2015, 21; 36-50
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An overview of current research trends on graphene and it’s applications
Autorzy:
Krishna, R. S.
Mishra, Jyotirmoy
Das, Shaswat Kumar
Mustakim, Syed Mohammed
Powiązania:
https://bibliotekanauki.pl/articles/1068613.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Concrete
Doping
Electrical
Graphene
Material
Mechanical
Properties
Sustainability
Opis:
Graphene is no doubt called a wonder-material due to its outstanding superlative traits. It has its application near about in every field. Its properties are extraordinary and different from any day-to-day material. Albeit bearing such qualities, its structure is rather simple than most individuals cerebrate of. It has a thickness of an atom. It is a two-dimensional carbon arranged in a honeycomb crystal structure. It could transmute the way we view, in numerous fields of science. Its applications can be an asset to a greener environment for which Graphene engineered cement/concrete composites have an immense potential in the present times when sustainable construction materials are the need of the hour. Graphene can act as a good adsorbent for pollutant abstraction due to its high surface area. Either alone or in coalescence with different materials, it very well may be used for the debasement or deliberation of a sizably voluminous assortment of contaminants through a few strategies. Incipient heights can be achieved as the list of operations for graphene is virtually illimitable. Utilization of graphene in the coming years will give inundating difference to current technologies. This paper fixates on the applications and developments of Graphene in fields like Electronics, Batteries, Filtration, Medicine, Construction, and Composites.
Źródło:
World Scientific News; 2019, 132; 206-219
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chemical-induced seed germination and enhancement of seed potential of seven wild plant taxa of Ericaceae in India
Autorzy:
Chandan Kumar, Pati
Bhattacharjee, Aloke
Roy, Priyankar
Mahanty, Dibyendu S.
Panda, Subhasis
Powiązania:
https://bibliotekanauki.pl/articles/1158777.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Ericaceae
Seed germination
T50 of germination
catalase
protein
seed metabolism
Opis:
Pretreatment of seeds of seven wild plant taxa (viz., Gaultheria hookeri C. B. Clarke, G. stapfiana Airy Shaw, G. semi-infera (C. B. Clarke) Airy Shaw, G. trichophylla Royle var. ovata Panda & Sanjappa, Lyonia ovalifolia (Wall.) Drude var. ovalifolia, Pieris formosa (Wall.) D. Don and Vaccinium glauco-album C. B. Clarke) in the family Ericaceae using Na-dikegulac (Na-DK) for 8 hours (4 + 4 h in two installments) before keeping in ambient storage condition (32±2 ºC) for different durations (0 and 20 days) slowed down the rapid loss of germination and reduced the time (h) required for 50% seed germination (T50). Concomitantly, the reduction of protein level as well as the activity of catalase of seed kernels during storage period was ameliorated to a significant extent in the chemical pretreated seed lots.
Źródło:
World Scientific News; 2018, 114; 249-255
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of volatile organic compound producing Lignicolous fungal cultures from Gujarat, India
Autorzy:
Nagadesi, Praveen Kumar
Arya, Arun
Babu, Duvvi Naveen
Prasad, K. S. M.
Devi, P. P.
Powiązania:
https://bibliotekanauki.pl/articles/1178801.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
India
Lenzites sterioides
Lignicolous fungi
Volatile organic compound (VOC)
Opis:
This study aims to identify the lignicolous basidiomycetes species that synthetize volatile organic compounds with potential applications in food industry, cosmetics, perfumery and agriculture. We have collected fruiting bodies from different woody plants and the lignicolous basidiomyctes species were identified by their macroscopic and microscopic characteristics. From the context of the fresh fruiting bodies small fragments of dikaryotic mycelium were extracted and inoculated on PDA and MEA media for isolation and pure cultures are kept in dark at a temperature of 25°C. 11 species of lignicolous basidiomycetes, belonging to 6 families and 5 orders were isolated in pure culture. The isolates were analyzed in vitro and the main characteristics that were observed are: the general aspect of the surface and the reverse of the colonies, the changing in colour and the growth rate of the mycelium and also the specific odour which indicates the presence of the organic volatile compounds. for the first time lignicolous fungi like Flavodon flavus (Klotz.) Ryv., Ganoderma lucidum(Curtis) P. Karst, Hexagonia apiaria (Pers.) Fr., Lenzites betulina (L.) Fr. Lenzites eximia Berk. & M.A. Curtis, Lenzites sterioides (Fr.) Ryv., Navisporus floccosus (Bres.) Ryv., Phellinus gilvus (Schwein.) Pat., and Trametes pini (Thore) Britzelm. were producing characteristic smell that indicates presence of Volatile organic compounds. For the first time from Gujarat, India the Volatile organic compound producing fungi were identified and their culture characters also described.
Źródło:
World Scientific News; 2017, 90; 150-165
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-10 z 10

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