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Search Results: 1 - 10 of 342018 matches for " R. K. Singh "
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Power Law Nature in Electron Solid Interaction  [PDF]
Moirangthem Shubhakanta Singh, R. K. Brojen Singh
Advances in Materials Physics and Chemistry (AMPC) , 2017, DOI: 10.4236/ampc.2017.71002
Abstract: Monte Carlo simulation of paths of a large number of impinging electrons in a multi-layered solid allows defining area of spreading electrons (A) to capture overall behavior of the solid. This parameter “A” follows power law with electron energy. Furthermore, change in critical energies, which are minimum energies loses corresponding to various electrons, as a function of variation in lateral distance also follows power law nature. This power law behavior could be an indicator of how strong self-organization a solid has which may be used in monitoring efficiency of device fabrication.
Stability Analysis of Cut Slopes Using Continuous Slope Mass Rating and Kinematic Analysis in Rudraprayag District, Uttarakhand  [PDF]
R. K. Umrao, R. Singh, M. Ahmad, T. N. Singh
Geomaterials (GM) , 2011, DOI: 10.4236/gm.2011.13012
Abstract: In mountain terrains of Himalaya, road and highway networks play a vital role in remote areas for transportation, public network and all kind of socio-economic activities. The stability of rock slopes along the roads and highways is a major concern in these hilly regions. Any kind of slope failure may lead to disruption in traffic, loss of properties and lives/injuries as well as environmental degradation. The unplanned excavations of rock slopes for construction or widening purposes may undermine the stability of the slopes. The present study incorporates the stability analysis of road cut slopes along NH-109 which goes to holy shrine of Kedarnath. Slope failure is not only a phenomenon of rainy season but it has also been encountered even in dry season. The study area experiences high vehicular traffic especially from March to August due to pilgrims since it is the only road to Kedarnath. The distance of about 20 km between Rudraprayag and Agastmuni has been investigated. The continuous slope mass rating (CSMR) technique has been used for slope stability analysis at five different locations. CSMR is modification of original slope mass rating (SMR) proposed by Romana which is based on well established rock mass rating (RMR) technique. Kinematic analysis was also carried out to evaluate these sites for types of failure and its potential failure directions. The potentially vulnerable sites were identified. The results indicate that the CSMR technique may be exploited to assess the stability of rock slopes in the Himalayan territory.
Development of Algorithm of Traditional Kei-Yen Game  [PDF]
Lourembam Herojit Singh, Pooja Sapra, R. K. Brojen Singh
Journal of Computer and Communications (JCC) , 2018, DOI: 10.4236/jcc.2018.68004
Abstract: Manipuri traditional game Kei-Yen, which originates from the ancient Meitei mythological story, is a mind game between two players of different mindsets, one has the mindset of killing (Kei), whereas the other (Yen) has the mindset of protecting itself and block the moves of Kei. We propose and develop an algorithm of this game by incorporating various possible logical tactics and strategies for a possible computer software of this game. Since this game involves various logical mind games, playing this game can improve our way of thinking, strategies, tricks and other skills related to mind game. In this play there is not the case of draw which means one has to win over the other at the end of the game. This game could become one of most interesting indoor national or international game.
Simulink Based Analysis and Realization of Solar PV System  [PDF]
S. Badie Asghar, R. K. Singh
Energy and Power Engineering (EPE) , 2015, DOI: 10.4236/epe.2015.711051
Abstract: Non-conventional energy resources are increasingly used to fulfill load demands. Before using such energy sources, the very important thing is analysis at the basic level. This paper presents analysis and realization of solar PV system. The current-voltage and power-voltage characteristics of solar PV array changes as parameters like solar insolation, and temperature changes. These characteristics are found and realized by using MATLAB software.
Microwave Scattering for Soil Texture at X-Band and Its Retrieval Using Genetic Algorithm  [PDF]
Rajesh Tiwari, R. K. Singh, D. S. Chauhan, O. P. Singh, R. Prakash, D. Singh
Advances in Remote Sensing (ARS) , 2014, DOI: 10.4236/ars.2014.33010
Abstract: In the present paper, we have studied the effect of soil textures, i.e., sand, silt and clay on microwave scattering at X-band (10 GHz) at various incidence angles and like polarizations (i.e., Horizontal-Horizontal; HH-, Vertical-Vertical; VV-). We have proposed a retrieval technique based on Genetic Algorithm (GA) to retrieve soil texture. For this purpose, ten types of soil mixtures having different percentage of sand, silt and clay have been analyzed. The observations were carried out by ingeniously assembled X-band scatterometer. A good agreement has been noticed between estimated and observed soil texture. Study infers that soil texture is quite sensitive to radar scattering and it is possible to retrieve soil texture with radar/scatterometer data with good accuracy and this type of retrieved results can be helpful to predict soil strength as well as soil erosion of the particular area.
MRR Improvement in Sinking Electrical Discharge Machining: A Review  [PDF]
Kuldeep Ojha, R. K. Garg, K. K. Singh
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2010, DOI: 10.4236/jmmce.2010.98051
Abstract: Electrical discharge machining (EDM) is one of the earliest non-traditional machining processes. EDM process is based on thermoelectric energy between the workpiece and an electrode. Material removal rate (MRR) is an important performance measure in EDM process. Since long, EDM researchers have explored a number of ways to improve and optimize the MRR including some unique experimental concepts that depart from the traditional EDM sparking phenomenon. Despite a range of different approaches, all the research work in this area shares the same objectives of achieving more efficient material removal coupled with a reduction in tool wear and improved surface quality. The paper reports research on EDM relating to improvement in MRR along with some insight into mechanism of material removal. In the end of the paper scope for future research work has been outlined.
Parametric Optimization of PMEDM Process using Chromium Powder Mixed Dielectric and Triangular Shape Electrodes  [PDF]
Kuldeep Ojha, R. K. Garg, K. K. Singh
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2011, DOI: 10.4236/jmmce.2011.1011083
Abstract: In this article, parametric optimization for material removal rate (MRR) and tool wear rate (TWR) study on the powder mixed electrical discharge machining (PMEDM) of EN-8 steel has been carried out. Response surface methodology (RSM) has been used to plan and analyze the experiments. Average current, duty cycle, angle of electrode and concentration of chromium powder added into dielectric fluid of EDM were chosen as process parameters to study the PMEDM performance in terms of MRR and TWR. Experiments have been performed on newly designed experimental setup developed in laboratory. Most important parameters affecting selected performance measures have been identified and effects of their variations have been observed.
Synergistic Influence of Pre-Harvest Calcium Sprays and Postharvest Hot Water Treatment on Fruit Firmness, Decay, Bitter Pit Incidence and Postharvest Quality of Royal Delicious Apples (Malus x domestica Borkh)  [PDF]
R. R. Sharma, D. Singh, R. K. Pal
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.41020
Abstract: Experiments were conducted to observe the effect of pre-harvest calcium (Ca) applied as calcium chloride (1% W/V) and postharvest hot water treatment (HWT) on Royal Delicious apples. For this, apples were divided in 4 lots viz., untreated (neither Ca nor HWT), Ca alone (pre-harvest 3 sprays of CaCl2 (1.0% w/v) in the orchard), HWT (42℃ for 2 h). Apples of all four lots were stored in cold storage maintained at 0℃ ± 1℃ and 90% - 95% relative humidity for 6 months. After storage, fruits were removed to ambient conditions for 5 days, and then observations on decay area and incidence, bitter pit incidence, fruit Ca content, lipoxygenase (LOX) and antioxidant (AOX) activity, fruit firmness and fruit quality parameters were recorded. After 6 months in cold storage plus 5 day at 22℃ ± 2℃ and 70% + 4% RH, apples, which received Ca as pre-harvest spray or those which received postharvest hot water treatment or Ca + HWT had significantly lesser decay area (decay lesions) caused by Penicillium expansum or Botrytis cinerea than untreated ones (control). Ca + HWT treatment was significantly more effective on B. cinerea than P. expansum. Untreated apples exhibited higher incidence of bitter pit (18.2%) than those treated with Ca or HWT or both. Fruit Ca content
Assessment of Rockfall Hazard along the Road Cut Slopes of State Highway-72, Maharashtra, India  [PDF]
M. Ahmad, R. K. Umrao, M. K. Ansari, Rajesh Singh, T. N. Singh
Geomaterials (GM) , 2013, DOI: 10.4236/gm.2013.31002

Rockfall is a major problem in high hill slopes and rocky mountainous regions and construction of highways at these rockfall prone areas often require stable slopes. The causes of rockfall are presence of discontinuities, high angle cut slopes, heavy rainfall, and unplanned slope geometry etc. Slope geometry is one of the most triggering parameters for rockfall, when there are variations in slope angle along the profile of slope. The Present study involves rockfall hazard assessment of road cut slopes for 15 km distance starting from Mahabaleshwar town along State Highway-72 (SH-72). The vertical to subvertical cut slopes are prone to instability due to unfavorable orientation of discontinuities in slope face of weathered and altered basaltic rockmass. The predominant type of instability has been found as wedge type failure involving medium to large size blocks. In order to investigate the existing stability conditions, analyses were carried out at two locations under different slope conditions. The kinematic analysis was performed using stereographic projection method. RockFall 4.0 numerical simulator software was used to calculate the maximum bounce heights, total kinetic energies and translational velocities of the falling rockmass blocks, and a comparative analysis is presented with increasing the mass of blocks and height of the slope. The result of numerical analysis shows that varying slope angle geometry creates more problems as compared to the mass of blocks in the scenario of rockfall.

Translation and Validation of the Nepalese Version of Derriford Appearance Scale (DAS59)  [PDF]
Varun Pratap Singh, R. K. Singh, T. P. Moss, D. K. Roy, D. D. Baral
Modern Plastic Surgery (MPS) , 2013, DOI: 10.4236/mps.2013.32010

Objectives: To establish a valid and reliable translated version of Derriford Appearance Scale (DAS59) for Nepali population. Methods: A standard translation-back-translation procedure was used followed by evaluation of semantic, conceptual and society equivalence by the committee and changes were made according to recommendations. This corrected version was pretested and a final version was developed. A validation study was performed using the final version on 424 patients including 212 patients with clinical appearance problems and similar number of young adults who had no concern for facial appearance. Reliability was assessed by Cronbach’s alpha value and test-retest correlation coefficient. Discriminate and convergent validity were assessed by comparison between clinical and normal population and correlation with Beck’s Anxiety Inventory (BAI), Beck’s Depression Inventory (BDI) and General Health questionnaire (GHQ). Results: The results indicated excellent internal consistency (Cronbach’s alpha = 0.98) and good test-retest reliability (0.91 for clinical population, 0.86 for normal population). The Discriminate validity was good with statistically significant differences between clinical and normal population. The convergent validity was confirmed by good correlation with other related psychometric tools. Conclusion: A valid and reliable Nepali DAS59 version was developed which can be used for research and clinical assessment of patients with appearance problems and concerns.

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