Detecting the magnitude of depression in Twitter users using sentiment analysis
Depression; Emotional integrity; Sentiment analysis; Twitter data; Weighted average scoring
Today the different social networking sites have enabled everyone to easily express and share their feelings with people around the world. A lot of people use text for communicating, which can be done through different social media messaging platforms available today such as Twitter, Facebook etc, as they find it easier to express their feelings through text instead of speaking them out. Many people who also suffer from stress find it easier to express their feelings on online platform, as over there they can express themselves very easily. So if they are alerted beforehand, there are ways to overcome the mental problems and stress they are suffering from. Depression stands out to be one of the most well known mental health disorders and a major issue for medical and mental health practitioners. Legitimate checking can help in its discovery, which could be useful to anticipate and prevent depression all-together.Hence there is a need for a system, which can cater to such issues and help the user. The purpose of this paper is to propose an efficient method that can detect the level of depression in Twitter users. Sentiment scores calculated can be combined with different emotions to provide a better method to calculate depression scores. This process will help underscore various aspects of depression that have not been understood previously. The main aim is to provide a sense of understanding regarding depression levels in different users and how the scores can be correlated to the main data. 2019 Institute of Advanced Engineering and Science. All rights reserved.
International Journal of Electrical and Computer Engineering, Vol-9, No. 4, pp. 3247-3255.
Institute of Advanced Engineering and Science
All Open Access; Gold Open Access; Green Open Access
https://doi.org/10.11591/ijece.v9i4.pp3247-3255 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85067230531&doi=10.11591%2fijece.v9i4.pp3247-3255&partnerID=40&md5=546cb2e7738d44d3dd92312d312041ec
Stephen J.J., Department of Computer Science, Christ (Deemed to Be University), Hosur Main Road, Bangalore, 560029, India; Prabu P., Department of Computer Science, Christ (Deemed to Be University), Hosur Main Road, Bangalore, 560029, India
Empirical analysis of ensemble methods for the classification of robocalls in telecommunications
Ensemble method; Machine Learning; Random Forest; Robocalls; XGBoost
With the advent of technology, there has been an excessive use of cellular phones. Cellular phones have made life convenient in our society. However, individuals and groups have subverted the telecommunication devices to deceive unwary victims. Robocalls are quite prevalent these days and they can either be legal or used by scammers to trick one out of their money. The proposed methodology in the paper is to experiment two ensemble models on the dataset acquired from the Federal Trade Commission (DNC Dataset). It is imperative to analyze the call records and based on the patterns the calls can classify as a robocall or not a robocall. Two algorithms Random Forest and XgBoost are combined in two ways and compared in the paper in terms of accuracy, sensitivity and the time taken. 2019 Institute of Advanced Engineering and Science. All rights reserved.
International Journal of Electrical and Computer Engineering, Vol-9, No. 4, pp. 3108-3114.
https://doi.org/10.11591/ijece.v9i4.pp3108-3114 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85067249556&doi=10.11591%2fijece.v9i4.pp3108-3114&partnerID=40&md5=5de1b797aa825326a6929c9d83c87dcc
Ghosh M., Department of Computer Science, Christ (Deemed to Be University), Hosur Main Road, Bangalore, 560029, India; Prabu P., Department of Computer Science, Christ (Deemed to Be University), Hosur Main Road, Bangalore, 560029, India
Are Narrow-line Seyfert 1 Galaxies Powered by Low-mass Black Holes?
accretion, accretion disks; galaxies: active; galaxies: Seyfert
Narrow-line Seyfert 1 galaxies (NLS1s) are believed to be powered by the accretion of matter onto low-mass black holes (BHs) in spiral host galaxies with BH masses M BH ? 106-108 M o. However, the broadband spectral energy distribution of the ?-ray-emitting NLS1s are found to be similar to flat-spectrum radio quasars. This challenges our current notion of NLS1s having low M BH. To resolve this tension of low M BH values in NLS1s, we fitted the observed optical spectrum of a sample of radio-loud NLS1s (RL-NLS1s), radio-quiet NLS1s (RQ-NLS1s), and radio-quiet broad-line Seyfert 1 galaxies (RQ-BLS1s) of ?500 each with the standard Shakura-Sunyaev accretion disk (AD) model. For RL-NLS1s we found a mean log() of 7.98 0.54. For RQ-NLS1s and RQ-BLS1s we found mean log() of 8.00 0.43 and 7.90 0.57, respectively. While the derived values of RQ-BLS1s are similar to their virial masses, for NLS1s the derived values are about an order of magnitude larger than their virial estimates. Our analysis thus indicates that NLS1s have M BH similar to RQ-BLS1s and their available virial M BH values are underestimated, influenced by their observed relatively small emission line widths. Considering Eddington ratio as an estimation of the accretion rate and using , we found the mean accretion rate of our RQ-NLS1s, RL-NLS1s, and RQ-BLS1s as , and , respectively. Our results therefore suggest that NLS1s have BH masses and accretion rates that are similar to BLS1s. 2019. The American Astronomical Society. All rights reserved.
Viswanath G.; Stalin C.S.; Rakshit S.; Kurian K.S.; Ujjwal K.; Gudennavar S.B.; Kartha S.S.
Astrophysical Journal Letters, Vol-881, No. 1
All Open Access; Bronze Open Access; Green Open Access
https://doi.org/10.3847/2041-8213/ab365e https://www.scopus.com/inward/record.uri?eid=2-s2.0-85071224038&doi=10.3847%2f2041-8213%2fab365e&partnerID=40&md5=2ee9e3e92bbaf0221226e1dc8c52cee8
Viswanath G., Department of Physics and Electronics, CHRIST (Deemed to Be University), Bengaluru, Karnataka, 560029, India; Stalin C.S., Indian Institute of Astrophysics, Block II, Koramangala, Bengaluru, Karnataka, 560034, India; Rakshit S., Finnish Centre for Astronomy with ESO (FINCA), University of Turku, Quantum, Vesilinnantie 5, FI-20014, Finland; Kurian K.S., Indian Institute of Astrophysics, Block II, Koramangala, Bengaluru, Karnataka, 560034, India; Ujjwal K., Department of Physics and Electronics, CHRIST (Deemed to Be University), Bengaluru, Karnataka, 560029, India; Gudennavar S.B., Department of Physics and Electronics, CHRIST (Deemed to Be University), Bengaluru, Karnataka, 560029, India; Kartha S.S., Department of Physics and Electronics, CHRIST (Deemed to Be University), Bengaluru, Karnataka, 560029, India
Extraction and characterization of biofuel from industrial waste organic pupae-silkworm
Blends; Pupae; Silkworm; Soxhlet Extractor
The current work carted out of analysis on the production of fuel from pupae fat extracted from silkworm, and exhaustive investigations were conducted to determine the characteristics of obtained fuel and its blends. The oily organic compounds derived from silkworm is effectively adopted to produce biofuel. The soxhlet extractor is utilized here to separate the oil content from pupae and obtained oil processed into biofuel by undertaking the transesterification process using NaOH as a fast reactive agent along with methanol. The rate of biofuel derived from pupae oil has been noticed to be 65-70 by vol%. The extracted fuels from the transesterification process were mixed with high-speed diesel at a rate of B10, B20, B30 and B40 on volume base. The most important physical and chemical characteristics of generated fuel and their mixture with conventional diesel were examined. The investigation results reveal that the fuel sample B20 satisfies all the requirements of ASTM standards. Pure biofuel shows that the lesser heating value, higher KV, flash point, fire point and density than that of conventional diesel. The blended samples reveal that all the properties are keep moving towards higher value with an increasing percentage of biofuel presence except calorific value. Finally results in evidence that, well suitable biofuel can be generated from organic waste material like silkworm and effectively use it in practical applications. BEIESP.
Ravikumar R.; Harish Kumar M.; Kiran K.; Hebbar G.S.
International Journal of Recent Technology and Engineering, Vol-8, No. 3, pp. 1603-1607.
Blue Eyes Intelligence Engineering and Sciences Publication
https://doi.org/10.35940/ijrte.C4422.098319 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85073735740&doi=10.35940%2fijrte.C4422.098319&partnerID=40&md5=e4b6220b5bef8c1e5c6b5faab1cccd09
Ravikumar R., Department of Mechanical and Automobile Engineering, Faculty of Engineering, CHRIST (Deemed to be University), India; Harish Kumar M., Department of Mechanical and Automobile Engineering, Faculty of Engineering, CHRIST (Deemed to be University), India; Kiran K., Department of Mechanical and Automobile Engineering, Faculty of Engineering, CHRIST (Deemed to be University), India; Hebbar G.S., Department of Mechanical and Automobile Engineering, Faculty of Engineering, CHRIST (Deemed to be University), India
Prediction of indoor air circulation of residential room with adaptation of solar chimney using numerical technique
Natural Convection; Numerical Technique; Solar chimney; Ventilation
With the exponential increase in consumption of electrical power during the summer season by household, there is a great need for households to withhold sustainability. To maintain the temperature of the household a passive heating and cooling system is used i.e. Solar Chimney. Ventilation, through a natural convection process, is gaining a lot of attention to be an alternative technique for mechanical air conditioning ventilation because of its reduced power usage when compared to the external cooling devices used in residential buildings of hot regions. The present study, involve solar chimney of horizontal and vertical designs in comparison with different width and height. The following paper studies the effect of a solar chimney on the indoor thermal behavior using Numerical Technique for a prototype of a residential room. The performance on the ventilation velocity and air temperature operation inside the room with varying air gap width is studied based on multiple numerical analysis solutions. The present study deals with two different architectures of a two dimensional model and results have shown that the ventilation velocity has increased to 0.017626444 kg/s and operative air temperature has been decreased by 7.26C for the vertical model while the horizontal model has shown a mass flow rate of 0.018027636 kg/s and a temperature decrease of 9.15C. The most efficient chimney was found to be model 7 which is horizontal solar chimney 3 with an air gap width of 0.05625m and a height of 0.3175 m, when compared to the other models from model number one to six. BEIESP.
Kongi P.; Thejaraju R.; Madan Kumar T.S.; Joseph P.
International Journal of Innovative Technology and Exploring Engineering, Vol-8, No. 11, pp. 4110-4116.
https://doi.org/10.35940/ijitee.K1477.0881119 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85073382269&doi=10.35940%2fijitee.K1477.0881119&partnerID=40&md5=a5e5d1f16db122c43704dbbedafc62ca
Kongi P., B.V.B College of Engineering and Technology, India; Thejaraju R., Department of Mechanical and Automobile Engineering in the area of Heat Transfer, Fluid Dynamics and Energy, India; Madan Kumar T.S., Department of Mechanical and Automobile Engineering, India; Joseph P., CHRIST (Deemed to Be University), Faculty of Engineering, India
2--Intercalated NiCo-Layered Double Hydroxide Nanospikes: An Efficiently Synergized Material for Urine to Direct H2 Generation
hydrogen evolution reaction; layered double hydroxide; nickel oxyhydroxide; sewage denitrification; urea oxidation reaction; urine/urea electrolysis
Substituting the energy-uphill water oxidation half-cell with readily oxidizable urea-rich urine, a ground-breaking bridge is constructed, combining the energy-efficient hydrogen generation and environmental protection. Hence, designing a robust multifunctional electrocatalyst is desirable for widespread implementation of this waste to fuel technology. In this context, here, we report a simple tuning of the electrocatalytically favorable characteristics of NiCo-layered double hydroxide by introducing [MoS4]2- in its interlayer space. The [MoS4]2- insertion as well as its effect on the electronic structure tuning is thoroughly studied via X-ray photoelectron spectroscopy in combination with electrochemical analysis. This insertion induces overall electronic structure tuning of the hydroxide layer in such a way that the designed catalyst exhibited favorable kinetics toward all the required reactions of hydrogen generation. This is why our homemade catalyst, when utilized both as a cathode and anode to fabricate a urea electrolyzer, required a mere .37 V cell potential to generate sufficient H2 by reaching the benchmark 10 mA cm-2 in 1 M KOH/0.33 M urea along with long-lasting catalytic efficiency. Other indispensable reason of selecting [MoS4]2- is its high-valent nature making the catalyst highly selective and insensitive to common catalyst-poisoning toxins of urine. This is experimentally supported by performing the real urine electrolysis, where the nanospike-covered Ni foam-based catalyst showed a performance similar to that of synthetic urea, offering its industrial value. Other intuition of selecting [MoS4]2- was to provide a ligand-based mechanism for hydrogen evolution half-cell [hydrogen evolution reaction (HER)] to preclude the HER-competing oxygen reduction. Another crucial point of our work is its potential to avoid the mixing of two explosive product gases, that is, H2 and O2. 2019 American Chemical Society.
Nadeema A.; Kashyap V.; Gururaj R.; Kurungot S.
ACS Applied Materials and Interfaces, Vol-11, No. 29, pp. 25917-25927.
https://doi.org/10.1021/acsami.9b06545 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85070485703&doi=10.1021%2facsami.9b06545&partnerID=40&md5=282f8030ba09bd6347ea7072fd5950a6
Nadeema A., Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune, 411008, India, Academy of Scientific and Innovative Research (AcSIR), New Delhi, 110001, India; Kashyap V., Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune, 411008, India, Academy of Scientific and Innovative Research (AcSIR), New Delhi, 110001, India; Gururaj R., Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune, 411008, India, Christ University, Bengaluru, 560029, India; Kurungot S., Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune, 411008, India, Academy of Scientific and Innovative Research (AcSIR), New Delhi, 110001, India
Are muslims incurring higher out-of-pocket expenditures than hindus in reproductive healthcare at sub-district levels in Karnataka?
Health and inequality; Health expenditures; Health insurance; OOP health expenditure; Reproductive health
Background and Objective: This study was undertaken to evaluate level of differences found in Out-of-pocket expenditures (OOPE) among Hindus and Muslims, OOPE being a sub-component while constructing reproductive health account (RHA) matrices for Ramanagara district, Karnataka. Method: Adopting multistage stratified sampling method, individual level data was collected using survey tools, catering to six dimensions of RH functions, taken from WHO Guide to produce RH Sub-Account. 517 Hindu and Muslim men and women meeting inclusion criteria of reproductive age (15-49) incurring RH expenditures in last one year were included followed later by only 382 uninsured individuals for hypothesis testing. Results: Muslims showing almost double OOPE in RH necessitated hypothesis testing of significant difference in OOPE, equating groups, post exclusion of insured individuals. Statistically significant difference was revealed in RH expenditures using Mann-Whitney U test. Interpretations and conclusions: Vicious cycle of disparity in education levels, lower income levels, negligible health coverage, strenuous work conditions, poor living standards, repeated RH contingencies leading to massive borrowing financed OOPE in RH continues. 2019, Indian Journal of Public Health Research and Development. All rights reserved.
Indian Journal of Public Health Research and Development, Vol-10, No. 8, pp. 283-289.
Sarkar R., Adjunct Faculty, CHRIST (Deemed to be University), Bangalore, India; Mahesh E., Department of Economics, CHRIST (Deemed to be University), Bangalore, India
Impact of corporate governance on financial performance of information technology companies
Corporate Governance; Financial performance; IT companies
Corporate Governance is a broad term in todays competitive world. It is a series of processes, policies, rules, and regulations by which companies are managed and governed. In this perspective, the study attempts to analyze the impact of corporate governance on the financial performance of Information Technology (IT) Companies in India. Specifically, the study analyzed the impact of Board size, Board Composition, and Audit Committee Independence on Return on Assets and Return on Equity, which are considered as measures of financial performance. The findings of the study revealed that there is a significant and positive impact of Corporate Governance on Financial performance of IT companies, and Audit Committee Independence shows the most significant effect on Financial performance. The finding of the study endeavors to contribute to the limited literature available in the context of corporate governance in IT companies in India. BEIESP.
International Journal of Recent Technology and Engineering, Vol-8, No. 3, pp. 7460-7464.
https://doi.org/10.35940/ijrte.C5603.098319 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85073564091&doi=10.35940%2fijrte.C5603.098319&partnerID=40&md5=a2818915693b950797a637eb94ae02ac
Kaura P., Institute of Management, Christ (Deemed to be University), NCR, Dehli, India; Dharwal M., School of Business Studies, Sharda University, Greater Noida, India; Kaur H., S.S. Bhatnagar University, Institute of Chemical Engineering and Technology, Punjab University, Chandigarh, India; Kaur P., Punjabi University, Patiala, Punjab, India
Data visualization and toss related analysis of IPL teams and batsmen performances
"R" tool; "Spyder" tool; Data visualization; Player performance; Sports analytics
Sports play a very significant role in the development of the human persona. Getting involved in games like Cricket and other various sports help us to build character, discipline, confidence and physical fitness. Indian Premier League, IPL provides the most successful form of cricket as it gives opportunities to young and talented players to show case their talents on various pitch. Decision-makers are the utmost customers for all fundamentals in the sports analytics framework. Sports analytics has been a smash hit in shaping success for many players and teams in various sports. Sports analytics and data visualization can play a crucial role in selecting the best players for a team. This paper is about the Toss Related analysis and the breadth of data visualization in supporting the decision makers for identifying inherent players for their teams. Copyright 2019 Institute of Advanced Engineering and Science. All rights reserved.
International Journal of Electrical and Computer Engineering, Vol-9, No. 5, pp. 4423-4432.
https://doi.org/10.11591/ijece.v9i5.pp4423-4432 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85067626841&doi=10.11591%2fijece.v9i5.pp4423-4432&partnerID=40&md5=281043e4624e602de894a149b826d936
Kanungo V., Department of Computer Science, CHRIST (Deemed to Be University), 77/38 Pius Villa, 1st Main, 11th Cross, SG Palya, India; Tulasi B., Department of Computer Science, CHRIST (Deemed to Be University), 77/38 Pius Villa, 1st Main, 11th Cross, SG Palya, India
EEG Neurofeedback Training in Children With Attention Deficit/Hyperactivity Disorder: A Cognitive and Behavioral Outcome Study
ADHD; attention deficit/hyperactivity disorder; children; EEG neurofeedback; follow-up
Background. Attention deficit/hyperactivity disorder (ADHD) is a highly prevalent childhood disorder with symptoms of inattention, impulsivity, and hyperactivity. EEG neurofeedback training (NFT) is a new intervention modality based on operant conditioning of brain activity, which helps reduce symptoms of ADHD in children. Methods and Procedures. To examine the efficacy of NFT in children with ADHD, an experimental longitudinal design with pre-post comparison was adopted. A total of 30 children in the age range of 6 to 12 years diagnosed as ADHD with or without comorbid conditions were assigned to treatment group (TG; n = 15) and treatment as usual group (TAU; n = 15). TG received EEG-NFT along with routine clinical management and TAU received routine clinical management alone. Forty sessions of theta/beta NFT at the C3 scalp location, 3 to 4 sessions in a week for a period of 3.5 to 5 months were given to children in TG. Children were screened using sociodemographic data and Binet-Kamat test of intelligence. Pre-and postassessment tools were neuropsychological tests and behavioral scales. Follow-up was carried out on 8 children in TG using parent-rated behavioral measures. Results. Improvement was reported in TG on cognitive functions (sustained attention, verbal working memory, and response inhibition), parent- and teacher-rated behavior problems and on academic performance rated by teachers. Follow-up of children who received NFT showed sustained improvement in ADHD symptoms when assessed 6 months after receiving NFT. Conclusion. The present study suggests that NFT is an effective method to enhance cognitive deficits and helps reduce ADHD symptoms and behavior problems. Consequently, academic performance was found to be improved in children with ADHD. Improvement in ADHD symptoms induced by NFT were maintained at 6-month follow-up in children with ADHD. EEG and Clinical Neuroscience Society (ECNS) 2018.
Shereena E.A.; Gupta R.K.; Bennett C.N.; Sagar K.J.V.; Rajeswaran J.
Clinical EEG and Neuroscience, Vol-50, No. 4, pp. 242-255.
ISSN: 15500594; PubMed ID: 30453757; CODEN: CENLB
Shereena E.A., National Institute of Mental Health & Neuro Sciences, Bengaluru, Karnataka, India; Gupta R.K., National Institute of Mental Health & Neuro Sciences, Bengaluru, Karnataka, India; Bennett C.N., Department of Psychology, Christ (Deemed to be University), Bengaluru, Karnataka, India; Sagar K.J.V., National Institute of Mental Health & Neuro Sciences, Bengaluru, Karnataka, India; Rajeswaran J., National Institute of Mental Health & Neuro Sciences, Bengaluru, Karnataka, India
"On the same page, but in different books?" exploring pedagogical beliefs of various stakeholders in management education
Application based learning; Correspondence analysis; Employability; Management education; Pedagogical mix; Perceptual difference; Students' engagement
The declining MBA enrolment numbers and campus placements are indicators of an alarming situation in India. The key stakeholders comprising of teachers, students, and corporates desire the same outcome, which is students with high employability. This implies everyone is on the same page, but the falling salary packages and rising unemployment make one wonder if this page is from a different book for each stakeholder? Through this study, we tried to bring in more clarity on the perception of the stakeholders in such B-schools regarding their choice of pedagogy to be employed. Drawing on the body of literature and peer group discussions, this study identified 15 pedagogical methods employed in higher education. Thus, to explore the preferred pedagogy, an exploratory research was designed and owing to the categorical nature of the data collected over a seven-month period, correspondence analysis was applied. Data analysis confirmed the existence of a huge perceptual gap amongst the stakeholders about the appropriate pedagogy to be used in management education. Student engagement and application based learning emerged as the two most important dimensions of pedagogy in this study. The results and findings can be extended further to understand causes for this perceptual gap and identify measures to bridge the same to ensure that these B - schools yield job ready students resulting in MBA regaining its lost glory. 2019, Associated Management Consultants Pvt. Ltd.. All rights reserved.
Prabandhan: Indian Journal of Management, Vol-12, No. 7, pp. 22-35.
Associated Management Consultants Pvt. Ltd.
Poulose J., Institute of Management, CHRIST (Deemed to be University), Mariam Nagar, Nandgram, Meerut Road, Ghaziabad, 201 003, Uttar Pradesh, India; Sharma V., Institute of Management, CHRIST (Deemed to be University), Mariam Nagar, Nandgram, Meerut Road, Ghaziabad, 201 003, Uttar Pradesh, India
Foreign Exchange, Gold, and Real Estate Markets in India: An Analysis of Return Volatility and Transmission
GARCH DCC; Gold; Spillover; U.S. dollar volatility
This empirical analysis endeavored to investigate the return volatility, covolatility, and the spillover impact of gold, real estate, and U.S. dollar in India. The generalized autoregressive conditional heteroskedasticity dynamic conditional correlation (GARCH -DCC) was used to reveal the return volatility and conditional correlation. The volatility spillover was examined by using the variance decomposition technique. The empirical outcome clearly revealed the presence of ARCH and GARCH effect on gold, realty, and U.S. dollar. Additionally, the results also manifested that the returns of these variables were not moving away from their means in the long run. On the other hand, the consequences of volatility spillover reported that real estate was the most dominating among all markets. This is so because returns on real estate had a significant contribution to the return volatility of the other markets. Finally, it was also found that return volatility of U.S. dollar was most affected as it was the net receiver of volatility, while return volatility of gold seemed to be neutral in the Indian financial market.
Indian Journal of Finance, Vol-13, No. 7, pp. 50-64.
Mishra A., Department of Economics, CHRIST (Deemed to be University), MariumNagar, Ghaziabad, 201 003, Uttar Pradesh, India
Brinkman-Forchheimer slip flow subject to exponential space and thermal-dependent heat source in a microchannel utilizing SWCNT and MWCNT nanoliquids
Brinkman-Forchheimer model; carbon nanofluid; carbon nanotubes; exponential heat source; Joule heating; microchannel
This communication examines the impact of carbon nanotubes (single-wall carbon nanotubes [SWCNT] and multi-wall carbon nanotubes [MWCNT]) on magnetohydrodynamic Brinkman and Forchheimer flow in a planar microchannel with multiple slips. Flow through a porous medium is modeled via Brinkman and Forchheimer theory. The impacts of thermal-dependent heat source (THS) and exponential space-dependent heat source (ESHS) are deployed. Aspects of Joule and viscous dissipations are also retained. The dimensionless equations are solved using the Runge-Kutta-Fehlberg joint with shooting methodology. The significance of various nondimensional parameters on the flow distributions as well as skin-friction and Nusselt number is illustrated and analyzed. Closed form solution of momentum quantity is developed for a particular case. Obtained numerical results are in perfect agreement with analytical results. Further, the results of SWCNT and MWCNT are compared. 2019 Wiley Periodicals, Inc.
Shehzad S.A.; Mahanthesh B.; Gireesha B.J.; Shashikumar N.S.; Madhu M.
Heat Transfer - Asian Research, Vol-48, No. 5, pp. 1688-1708.
https://doi.org/10.1002/htj.21452 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85067569162&doi=10.1002%2fhtj.21452&partnerID=40&md5=d07d2ac2577dab32a8a0198baf7600b0
Shehzad S.A., Department of Mathematics, COMSATS Instituteof Information Technology, Sahiwal, Pakistan; Mahanthesh B., Department of Mathematics, CHRIST (Deemed to be University), Bangalore, India; Gireesha B.J., Department of Studies and Research in Mathematics, Kuvempu University, Shimoga, India; Shashikumar N.S., Department of Studies and Research in Mathematics, Kuvempu University, Shimoga, India; Madhu M., Department of Studies and Research in Mathematics, Kuvempu University, Shimoga, India
Comparative experimental study of base line and thermal barrier coated four stroke four cylinder diesel fueled engine with low heat rejection
Base line engine; Diesel engine; Low heat rejection engine; Piston crown; Thermal barrier coating; Yttria partially stabilized zirconia
The depletion of conventional fuel source at a fast rate and increasing of environment pollution motivated extensive research in energy efficient engine design. In the present work, experimental investigations were carried out on a four-stroke four-cylinder diesel-fuelled Base Line Engine (BLE) by conducting a normal load test and measuring the required Brake Thermal Efficiency (BThE) and Specific Fuel Consumption (SFC) in a 100 HP dyno facility. A six-gas Analyser was used for the measurement of Unburnt Hydrocarbons (UBHC), Carbon monoxide (CO), Carbon dioxide (CO2), free Oxygen (O2), Nitrogen oxides (NOx), Sulphur oxides (SOx) and a smoke meter was used to measure smoke opacity. Low Heat Rejection (LHR) engine was realized by coating the crown of the aluminium alloy piston with the most popular Thermal Barrier Coating (TBC) material, namely 8%Yttria Partially Stabilized Zirconia (8YPSZ), after coating qualification on research pistons, specifically fabricated to retain the piston material specification, and the geometry of the crown contour. A normal load test was conducted on LHR engine to evaluate the performance as well as to determine the concentration of pollutants. A ~30% improvement in BThE and ~35% improvement in SFC was exhibited by the LHR engine at all loads studied (7 to 64%). While UBHC level showed an increase, the CO, CO2 and O2 contents as revealed in the emission test showed a mixed response (high and low) for an LHR engine. Compared with BLE, NOx and smoke level in LHR engine emission showed an increasing trend with the load. On comparing BLE and LHR engine test results, value addition to the BLE in terms of reduced fuel consumption and pollutants was observed. Universiti Malaysia Pahang, Malaysia.
International Journal of Automotive and Mechanical Engineering, Vol-16, No. 3, pp. 6889-6905.
Reghu V.R., Mechanical and Automobile Engineering Department, Faculty of Engineering CHRIST (Deemed to be University), Bangalore, 560074, India; Shankar V., Mechanical and Automobile Engineering Department, Faculty of Engineering CHRIST (Deemed to be University), Bangalore, 560074, India; Ramaswamy P., Mechanical and Automobile Engineering Department, Faculty of Engineering CHRIST (Deemed to be University), Bangalore, 560074, India
Green Luminescence and Irradiance Properties of Carbon Dots Cross-linked with Polydimethylsiloxane
In the present report, we have synthesized carbon dots by using anthracite coal as a precursor. The purpose of this work is to address the sensitivity and surface coating ability of carbon dots with polydimethylsiloxane (PDMS) polymer. The photoluminescence study shows the shift in emission wavelength of carbon dots in water and polymer individually for different excitation wavelengths (320-480 nm). The shifted peaks have higher intensities for higher excitation wavelengths, which are desirable for real world optical applications. This study gives a simple and novel approach to tune the fluorescence spectrum over the entire UV region just by varying the concentration of carbon dots in the polymer base. Detailed characterization revealed that the increase in the intensity of emission peaks can be obtained by using a polymer base system and changing the concentration of carbon dots. This new approach significantly opens a new window for multiapproach sensing methods. The irradiance studies of carbon dots with PDMS resulted in a decrease in absorption. This explains the photodegradation and photophysical properties of the material. The wettability property of the sample by using contact angle studies reveals its significance in coating industries such as nanoengineering, adhesives, casting, and injection molding. Copyright 2019 American Chemical Society.
Journal of Physical Chemistry C, Vol-123, No. 32, pp. 19835-19843.
https://doi.org/10.1021/acs.jpcc.9b04130 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85070705969&doi=10.1021%2facs.jpcc.9b04130&partnerID=40&md5=ba3b3fd93a4c3a3e72d74b7860f87a11
Pandey M., Department of Physics and Electronics, CHRIST (Deemed to Be University), Bengaluru, 560029, Karnataka, India; Manoj B., Department of Physics and Electronics, CHRIST (Deemed to Be University), Bengaluru, 560029, Karnataka, India
ALT speech recognition system using F0 improvement and spectral tilt method
ALT speech; Disordered speech; DREL noise; Formant frequency; Healthy speech (HE speech); Spectral Tilt
Human Beings use voice as the medium for communication. Human Speech is a very complex signal with multiple frequencies, amplitudes and intensities that mix up to convey specific information. In international terminology, voice disorders are described as dysphonia. Various dysphonias are clearly organic origin due to nervous, muscular, neuro or cellular degenerative disease affecting the body or it is from local laryngeal changes. Other dysphonias having no visible laryngeal causes are grouped as non organic involving habitual dysphonias that arise from faulty speaking habits or the psycho genic dysphonias that stem from emotional causes. This paper looks at a speech recognition system for disordered speech generated by Physically Disabled people using Artificial Larynx Transducer (ALT) device from the perspective of Speech Signal Processing. From the ALT speech features like formant, pitch and spectral tilt is estimated. For formant frequency estimation RNN technique is used. Before training the system pitch frequency improvement is accomplished. Now the features and homomorphic based coefficients are used for training the system. The same operation is performed during the test phase and compared with the training set. Comparison and decision making is accomplished using distance estimator. BEIESP.
International Journal of Engineering and Advanced Technology, Vol-8, No. 6, pp. 3556-3561.
https://doi.org/10.35940/ijeat.F9348.088619 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85072044607&doi=10.35940%2fijeat.F9348.088619&partnerID=40&md5=e304761b46779dae633617347980a18f
Inbanila K., CHRIST (Deemed to be University), Bangalore, Karnataka, India; Krishnakumar E., East Point College of Engineering and Technology, Avalahalli, Bengaluru, Karnataka, India
Impact of determinants on early internationalization: An exploratory study of Indian engineering SMEs
Determinants; Early internationalization; Emerging economy; Engineering industry; Exploratory study; SMEs
Purpose: The purpose of this paper is to analyze the influence of determinants on early internationalization in the context of an emerging economy, i.e. India. Design/methodology/approach: The study is based on an ex post facto exploratory research using primary data collected from a sample of 102 exporting small- and medium-sized enterprises (SMEs) in Bangalore. Findings: The overall results reveal that it is the proactive entrepreneurs and their previous experience that determine the early internationalization of SMEs. Further, competitive constraint was a major obstacle to enter the international market at an early age for late internationalized SMEs. Practical implications: The policy initiatives should aim to develop the international orientation of the entrepreneurs in the firm as a precursor for the formulation and subsequent implementation of internationalization strategies. Originality/value: Although studies have been conducted on determinants and early internationalization, these are confined to a few dimensions, and none of the studies have looked into the issues affecting the early internationalization holistically and with respect to SMEs in India. 2019, Emerald Publishing Limited.
Journal of Engineering, Design and Technology, Vol-17, No. 5, pp. 1018-1034.
https://doi.org/10.1108/JEDT-01-2019-0001 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85067067904&doi=10.1108%2fJEDT-01-2019-0001&partnerID=40&md5=c7feaacc46cd4ba6067483abb5d7c2ee
Santhosh C., Department of Economics, Christ University, Bangalore, India
Effect of supercooling on the microstructural development and optimization of physical properties of melt grown SnSe crystals
The microstructural development of stoichiometric tin monoselenide (SnSe) crystals grown by vertical BridgmanStockbarger method using an indigenously fabricated furnace has been investigated under high vacuum (~ 10?6 mbar). The ampoule translation rate (tr) and supercooling, ?T (= Tm ? T, where Tm is the melting point and T is the crystallization temperature) were varied in the range, 122mm/h and 20100C respectively. Enhancement of ?T and tr led to constitutional supercooling, inducing compositional changes and non-stoichiometry. Low ?T (2040C) and high tr (1210mm/h) resulted in globules, flakes and cavities. When ?T = 60C and tr = 9 to 7mm/h, mounds were formed with closed contours and ripples, due to atomically rough liquidsolid (l-?) interface. Fine tuning of ?T (60C) and tr (2mm/h) enabled smooth planar interface, so as to yield good quality crystalline structures with periodic atomic deposition promoting crystal growth, layer-by-layer. Energy dispersive analysis by X-rays and powder X-ray diffraction studies revealed appreciable crystallinity, chemical homogeneity and phase purity. The density of crystals estimated from crystallographic data (6.183g/cm3) corroborates with that obtained utilizing Archimedes principle. Thermogravimetric and microindentation analyses established thermal and mechanical stability. The low etch pit density (~ 102 cm?2) manifests nearly perfect growth of crystals than their melt counterparts. UVVisNIR and PL spectra reflected direct transition with an energy gap of 1.32eV, validating immense potential of the grown crystals for photovoltaic applications. 2019, Springer Science+Business Media, LLC, part of Springer Nature.
Kunjomana A.G.; Bibin J.; Karthikeyan R.; Varadharajaperumal S.
Journal of Materials Science: Materials in Electronics, Vol-30, No. 15, pp. 14300-14311.
https://doi.org/10.1007/s10854-019-01799-8 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85068864413&doi=10.1007%2fs10854-019-01799-8&partnerID=40&md5=2cab1d9d8ec4bb52f59bcd2ea10d11b1
Kunjomana A.G., Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore, 560 029, Karnataka, India; Bibin J., Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore, 560 029, Karnataka, India; Karthikeyan R., Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore, 560 029, Karnataka, India; Varadharajaperumal S., Centre for Nano Science and Engineering (CeNSE), Indian Institute of Science (IISc), Bangalore, 560 012, Karnataka, India
Perception of Entrepreneurial Ecosystem: Testing the ActorObserver Bias
actors; entrepreneurial capability; Entrepreneurial ecosystem; entrepreneurs; non-entrepreneurs; observers; socio-cultural norms
Entrepreneurial ecosystem is the interacting socio-economic environment that facilitates entrepreneurs to start and develop their enterprises. A vibrant and supportive entrepreneurial ecosystem is necessary for the start-up and growth of an enterprise. The entrepreneurial action would largely depend on the perception of entrepreneurs about the ecosystem. In this context, a study was designed to understand the perceptions of actors (entrepreneurs) and observers (non-entrepreneurs) on various components of the entrepreneurial ecosystem. Data for this study were collected from 296 entrepreneurs and 315 non-entrepreneurs from India, who responded to a 77-item questionnaire by giving their ratings of various aspects of the ecosystem on a 5-point scale. Findings of the study showed that perceptions of the entrepreneurial ecosystem were significantly different for most of the subgroups. Most notable among these differences was those between entrepreneurs and non-entrepreneurs, where the mean scores on all dimensions were found to be significantly higher for non-entrepreneurs than for entrepreneurs except for entrepreneurial capability which was found to be higher for entrepreneurs. Hence, the hypothesis of actorobserver bias in the perceptions of entrepreneurs and non-entrepreneurs is supported. 2019 SAGE Publications.
Journal of Entrepreneurship, Vol-28, No. 2, pp. 316-342.
Manimala M.J., Indian Institute of Management Bangalore, Bengaluru, India; Thomas P., CHRIST (Deemed to be University), Bengaluru, India; Thomas P.K., ICIER-India, Bengaluru, India
N-tier modelling of robust key management for secure data aggregation in wireless sensor network
Adversary; Attack; Cryptography; Public key encryption; Wireless sensor network
Security problems in Wireless Sensor Network (WSN) have been researched from more than a decade. There are various security approaches being evolving towards resisting various forms of attack using different methodologies. After reviewing the existing security approaches, it can be concluded that such security approaches are highly attack-specific and doesnt address various associated issues in WSN. It is essential for security approach to be computationally lightweight. Therefore, this paper presents a novel analytical modelling that is based on n-tier approach with a target to generate an optimized secret key that could ensure higher degree of security during the process of data aggregation in WSN. The study outcome shows that proposed system is computationally lightweight with good performance on reduced delay and reduced energy consumption. It also exhibits enhanced response time and good data delivery performance to balance the need of security and data forwarding performance in WSN. 2019 Institute of Advanced Engineering and Science.
International Journal of Electrical and Computer Engineering, Vol-9, No. 4, pp. 2682-2690.
https://doi.org/10.11591/ijece.v9i4.pp2682-2690 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85066233139&doi=10.11591%2fijece.v9i4.pp2682-2690&partnerID=40&md5=cc5a1b14b292893e38bcbf77debc167e
Metan J., Department of Computer Science and Enggineering, ACS College of Engineering, Bangalore, India; Narashinha Murthy K.N., Faculty of Engineering, Christ University, India