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Search Results: 1 - 10 of 14165 matches for " Ravinder Singh "
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Stochastic Model of a Cold-Stand by System with Waiting for Arrival & Treatment of Server  [PDF]
Rohtash K. Bhardwaj, Ravinder Singh
American Journal of Operations Research (AJOR) , 2016, DOI: 10.4236/ajor.2016.64031
Abstract: The service facility or server is the key constituent to keep a system operational for desired period of time. As any eventuality with the system necessitates immediate presence of it (server) so the time point of arrival and treatment of server significantly affects the system performance. This paper works out the steady state behavior of a cold standby system equipped with two similar units and a server with elapsed arrival and treatment times following general probability distributions. It practices the theory of semi-Markov processes, regenerative point technique and Laplace transforms to derive the expressions for state transition probabilities, mean sojourn times, mean time to system failure, system availability, server busy period and expected frequencies of repairs and treatments. The profit function is also developed taking different costs and revenue in to account. For tracing wider applicability of the model for different reliability and cost-effective systems, a particular case study is also presented as an illustration.
Gamma Radiation Shielding Properties of Steel and Iron Slags  [PDF]
Ravinder Singh, Sukhpal Singh, Gurmel Singh, Kulwant Singh Thind
New Journal of Glass and Ceramics (NJGC) , 2017, DOI: 10.4236/njgc.2017.71001
Using steel slag and two types of (soft and hard) iron slags, ten samples were prepared. Different gamma radiation interaction parameters were computed theoretically and measured experimentally at different energies: 60 keV, 136 keV, 662 keV, 1173 keV and 1332 keV in low and medium energy range using narrow transmission geometry. It has been observed that shielding effectiveness of a sample is inversely proportional to Half Value Layer (HVL). The obtained results were compared with Pure Flyash and it was observed that slag is better aggregate than flyash in shielding radiation as well as in construction applications. The results have been presented in the form of tables and graphs with more useful conclusions.
Patients with Dementia and Epilepsy: Does Family and Kinship Care Matters?  [PDF]
Ravinder Singh, Vibha Sharma, Upmesh Kumar Talwar
Advances in Anthropology (AA) , 2013, DOI: 10.4236/aa.2013.32008

Paper reports nine Case Studies each of epilepsy and dementia patients. Content analysis of family and kinship care in their families reveals significant issues of social stigma, marriage, school education, employment etc. among epilepsy patients as main concern while care of dementia patients in family concerns to spouse caring. It explores stigma affecting socio-cultural understanding of epilepsy and dementia. How these patients are cared within their family. Who care them most? It illuminates relevance of family and kinship care givers and recommend culturally appropriate interventions in community of such neuropsychiatric diseases.

International Journal of Engineering Science and Technology , 2011,
Abstract: Cold spraying has been effectively investigated for spraying of various metals, alloys and composites. Coating of ceramics like Hydroxyapatite (HAP) using thermal spraying has been investigated extensively, but there is a dearth of research related with HAP deposition using cold spraying. Many investigations have discussed theinfluential cold spraying parameters, but none has reported the relative percentage contribution of each of them. This paper examined the numerically investigated percentage contribution of five important factors of cold spraying viz. gas type, gas inlet pressure, gas inlet temperature, particle size and particle temperature on nozzle exit particle velocity from convergent-divergent (CD) nozzle. Simulated particle was given the properties of HAP powder. Optimum combination of levels and expected optimum exit particle velocity was analyzed through confirmation test and highest velocity was then mathematically validated and plotted using gas dynamic principles. Critical particle velocity for HAP deposition was also reported. Hence this research investigation throws light on the relative importance of cold spraying parameters using HAP powder and thus provides more insight into the behavior of HAP particle velocity for its successful deposition using cold spraying.
Ravinder Pal Singh,Harvinder Singh
International Journal of Engineering Science and Technology , 2011,
Abstract: Rice Husk ash and fly ash are agricultural and coal wastes respectively. These are produced in abundance globally and poses risk to health as well as environment. Thus their effective, conducive and eco-friendly utilization has always been a challenge for scientific community. The fly ash has been used as reinforcement for improved mechanical properties of composites (1,3-5,9). Rice husk ash can also be used for similar applications as its composition is almost similar to that of fly ash. This paper mainly deals with identification ofcharacteristics of both the fly ash and rice husk ash using spectroscopic and microscopic analysis. SEM, XRD,XRF and FTIR spectroscopic methods were used for the characterization of treated and untreated ashes. The results were compared and it was observed that both ashes possesses nearly same chemical phases and otherfunctional groups thus proposing the use of rice husk ash as reinforcement like fly ash in Metal Matrix Composites (MMCs) specifically for wear resistance applications.
Polymorphism of Renalase Gene in Patients of Chronic Kidney Disease  [PDF]
Ravinder Singh Ahlawat, Swapan Gupta, Seema Kapoor, Premashish Kar
Open Journal of Nephrology (OJNeph) , 2012, DOI: 10.4236/ojneph.2012.24021

Introduction: Chronic kidney disease (CKD) is an important public health problem. Early detection and treatment is a key factor for prevention of its complications. Hypertensive nephrosclerosis is a subtype of CKD which has a poor correlation between hypertension and development of nephropathy, implying role of genetic factors or epigenetic factors. The knowledge regarding genetic factors is limited. Renalase is a novel hormone with its gene on chromosome 10, which secretes flavin adenine dinucleotide dependent amine oxidase. Renalase metabolizes circulating catecholamines and modulates blood pressure and cardiac function. Recently, two single nucleotide polymorphisms of renalase gene rs2576178 GG and rs2296545 CC have been linked to essential hypertension. The SNPrs2296545 CC is also shown to be associated with cardiac hypertrophy, dysfunction and ischemia. The association of these two single nucleotide polymorphisms with hypertensive nephrosclerosis has not been investigated. Methods: We designed a case-control study to investigate whether the two known renalase gene polymorphisms rs2576178 and rs2296545 are associated with CKD particularly hypertensive nephrosclerosis. We genotyped these two polymorphisms in 287 subjects from North Indian population (106 CKD cases and 181 controls). Results: Comparison shows that subjects with hypertensive nephrosclerosis had higher frequencies of rs2296545 Callele than the healthy controls (0.63 versus 0.47, p < 0.02). The odds ratio for rs2296545 CC genotype in hypertensive nephrosclerosis were 2.55 (95% CI, 1.03 to 6.42; p = 0.02) (CC versus GG) and 2.11(95% CI, 1.01 to 4.42; p = 0.03) (CC versus CG + GG) compared to controls. Conclusion: These findings may provide novel insight into the role of additional genomic regions as susceptibility gene in the pathophysiology of hypertensive nephrosclerosis. Further, to account for geoethnic variation, studies on heterogeneous populations involving a larger sample size are required. The correlation between this structural change and actual levels of the enzyme or the activity are required to strengthen this association as well as to be clinically applicable.

Genetically modified crops and climate change linkages: An Indian perspective  [PDF]
Amanpreet Kaur, Ravinder Kumar Kohli, Paramjit Singh Jaswal
Agricultural Sciences (AS) , 2013, DOI: 10.4236/as.2013.410073

Genetically Modified Crops (GMCs) and Climate Change (CC) are the two most contentious ecological issues the world faces today. Application of transgenics in agriculture is most debated because of its direct and indirect implications. The advertized benefits in the backdrop of the potentially harmful effects on health and environment make this an issue of greater concern. On the other hand, Climate Change is a problem of enormous scale and its after-effects even more grave. The impact of climate change on agriculture, though well researched, is still very uncertain. Further, the introduction and global embrace of a technology with unverified credentials may prove to be an ill-conceived and ill-timed act. The future of GMC technology in India will be both challenging as well as exciting. Therefore any decision on this front should be taken with scientific rigor and logic. Our aim is to explore this complex inter-relationship and provide impetus for further research.

Golden Research Thoughts , 2013, DOI: 10.9780/22315063
Abstract: With the increasing knowledge in manifolds and related pressure on the individual, it is very difficult to keep balance of body, mind and soul. As said 'healthy body has healthy mind'. If a student is healthy, he will be full of self-confidence. Here a study is conducted to find the relationship between Mental Health of a student and his Self-confidence. The sample for the study was taken from three districts of Punjab i.e. Mohali, Fatehgarh Sahib and Ropar. 600 class X students from Government and Private school were included in the sample. It is found that majority of adolescents have average level of mental health and self confidence. Here from this point we can say in the state of Punjab, society is not aware about the Mental Health so the students. The importance of the Mental Health is realized here and need serious attempt on the part of society and NGOs to aware the people and make a future of healthy Body, Mind and Soul.
Static displacements due to single couples in a layered half-space
Ravinder Kumar Sahrawat,Kuldip Singh
Journal of Engineering and Applied Sciences , 2009,
Abstract: Closed form analytical expressions for the displacement field due to single couples in a layer overlying a half-space using the Fourier Transform Method in term of Galerkin vector are obtained. In engineering, elastic layer represents an elastic plate while in geophysics it represents a lithosphere. This type of coupling of an elastic layer overlying an elastic half-space corresponds to the realistic earth model-lithosphere lying over an asthenoshere. These expressions are true for all Lame’s parameters to remain non-zero and non-infinite. The final results are simple and quite convenient.
A Comparative Evaluation of Cryptographic Algorithms
Kumar Saurabh,Ravinder singh Mann
International Journal of Computer Technology and Applications , 2012,
Abstract: Security of information has become animportant issue in data communication.Encryption has come up as a solution, andplays a vital role in information securitysystem. This security mechanism usessome algorithms to scramble data intounreadable text which can be only beingdecoded or decrypted by party thosepossesses the associated key. Thesealgorithms consume a significant amountof computing resources such as CPU time,memory and battery power andcomputation time. This paper performscomparative analysis of three algorithm;ECC, AES and RSA considering certainparameters such as computation time andcomplexity of the algorithms. Acryptographic tool is used for conductingexperiments. Experiments results are givento analyses the effectiveness of eachalgorithm
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