Browse Items (1473 total)
Sort by:
-
Study of the diffuse ultraviolet background radiation at high galactic latitudes
The diffuse background radiation is observed throughout the whole sky and across every wavelength of the electromagnetic spectrum. The study of this background is of great importance as it contains photons coming from a variety of astrophysical environments, traveling over the time scales of a few hundred light years to the age of the universe itself. After the discover of the cosmic microwave background, the diffuse sky in all the other wavelengths was studied with great interest as the could provide useful insights into the formation history of the universe. -
Study of the diffuse ultraviolet background radiation at high galactic latitudes
The diffuse background radiation is observed throughout the whole sky and across every wavelength of the electromagnetic spectrum. The study of this background is of great importance as it contains photons coming from a va- riety of astrophysical environments, traveling over the time scales of a few hundred light years to the age of the universe itself. After the discovery of the cosmic microwave background, the diffuse sky in all the other wave- lengths was studied with great interest as they could provide useful insights into the formation history of the universe. In the work outlined in this the- sis, I will be describing this diffuse background radiation observed in the ultraviolet (UV) region. Over more than three decades of observations of the diffuse sky in the UV has revealed our lack of understanding of all the components that con- tribute to the observed background sky in this wavelength region. Initial studies arrived at controversial conclusions with one group suggesting that most of the observed diffuse surface brightness is due to the dust scat- tered starlight while another group suggested contribution from an exotic component along with the dust scattered component. We will explore this background sky in detail by trying to identify individual components and quantify its contribution at various regions in the sky. We have started our analysis at the Galactic pole regions with |b| > 80 using the data from Galaxy Evolution Explorer (GALEX) in the ultravio- let band. A major Galactic component of the diffuse sky in the UV is the starlight scattered by interstellar dust (also called Diffuse Galactic Light: DGL). We chose to study the Galactic poles due to the low dust environ- ment in these regions and easier modeling of the DGL component. We found consistent offsets in the UV data at a level of 230 290 photons s?1 cm?2 sr?1 1 (hereafter photon units) in the far-UV (FUV: 1539 and 480 580 photon units in the near-UV (NUV: 2316 when the UV surface brightness was compared with Galactic tracers like E(B-V) and the infrared surface brightness. These offsets represent the UV brightness at zero column densities. Part of this offset comes from the extragalactic background light (EBL) originating in background galaxies, Quasi-Stellar Objects (QSOs), etc. After careful estimation of this EBL component, we found a residual UV surface brightness of about 120 180 photon units in the FUV and 300 400 photon units in the NUV. The DGL component came to be about 120 photon units in these regions. We also found evidence for contribution from molecular hydrogen fluorescence at a column density of log NH > 20.2 (NH is in cm?2). We conclude that this contribution from H2 is from the cirrus features present at high Galactic latitudes. We further confirmed our findings at the north and south Galactic poles by studying the region between latitudes 70< b < 80 where we found similar offsets and the fluorescence contribution from H2 at the same levels as in the NGP. We proposed a possible contribution to the observed residual surface brightness coming from Hawking evaporation of Primordial Black Holes. But the level of this radiation was not sufficient to account for the entirety of the observed excess. The failure of this explanation only further deepens the mystery of the source of the excess surface brightness of the UV sky. -
Study of three-dimensional mapping of interstellar extinction in milky way galaxy
It is very difficult to model the three-dimensional distribution of interstellar matter (ISM) in our Galaxy because of the general lack of distance information. One of the few ways to probe the distance of the interstellar gas and dust is through absorption line measurements (in the case of gas) or through extinction (in the case of the dust), but these have been limited to a relatively small number of directions. -
Study of Three-Dimensional Mapping of Interstellar Extinction in Milky Way Galaxy
The Ultraviolet Imaging Telescope (UVIT) is scheduled to be launched as a part of the ASTROSAT satellite. As part of the mission planning for the instrument we have studied the efficacy of UVIT observations for interstellar extinction measurements. We find that in the best case scenario, the UVIT can measure the reddening to an accuracy of about 0.02 magnitudes, which combined with the derived distances to the stars, will enable us to model the three-dimensional distribution of extinction in our Galaxy. The knowledge of the distribution of the ISM will then be used to study distant objects, affected by it. This work points the way to further refining the UVIT mission plan to best satisfy different science studies. newlineWe report here on our plans to use data from the Ultraviolet Imaging Telescope (UVIT) aboard the ASTROSAT mission to probe the extinction across the entire sky. This mission has been in develonment since 2000 (Agrawal 2001) and is expected to be launched on a Polar Satellite Launch Vehicle (PSLV) rocket by the Indian Space Research Organization (ISRO) in 2013. The UVIT instrument is being developed at the Indian Institute of Astrophysics (IIA) and includes three telescopes, two in the ultraviolet (FUV and NUV) and one in the visible, each including a filter wheel with a number of different filters (Kumar et al. 2012). We have run a series of simulations to determine which filters are best suited for our purpose and will use these results in planning our observations with the UVIT. -
Study of triple diffusive convection in non newtonian liquids
This thesis presents the study of triple diffusive convection in two nonNewtonian liquids couple stress liquid and viscoelastic liquid of type Oldroyd-B in the presence of external constraints like rotation, gravity modulation and temperature modulation. Linear stability analysis provides the stability condition of stationary and oscillatory convection and the resultant eigen function describes the newlineconvective flow. However, linear analysis can neither help to examine the rate newlineof heat and mass transfer nor provides information on the convection newlineamplitudes. Therefore, it is also important to do nonlinear analysis. In view of newlinethis, all the problems considered in this thesis are studied for both linear and newlinenonlinear cases. The eigen value arising in the linear case for the problems newlinewithout modulation is solved by normal mode technique whereas for the problems with modulation is solved by perturbation method by adopting Venezian approach. The nonlinear study is done by using Ginzburg Landau newlinemodel for the problems with couple stress liquid whereas the nonlinear study is done by truncated representation of Fourier series by Lorenz model for the problems with viscoelastic Oldroyd-B liquid. The present study has wide range of applications in material processing, solidification of alloys, underground spreading of chemical pollutants, petroleum reservoirs, cooling of electronic devices, thermal insulation newlinematerial, crystal growth, transport of chemical substances, solar receivers, newlineinjection moulding, chemical industries, nuclear industries, bioengineering, newlineoceanography, meteorology, astrophysics, geophysics and so on. The extensive description of wide-ranging applications of triple diffusive convection in non-Newtonian liquids is accountable for the motivation of this thesis. The following four problems are carried out in this thesis: (i) EFFECT OF ROTATION ON TRIPLE DIFFUSIVE CONVECTION IN COUPLE STRESS LIQUID The effect of rotation on triple diffusive convection in couple newlinestress liquid is considered. -
-
Study of two-dimensional, all-time dispersion of a solute in a fluid-saturated porous medium
The effect of interphase mass transfer on dispersion in a unidirectional flow through a horizontally extent of infinite porous channel is examined using the generalized dispersion model of Sankarasubramanian and Gill [91]. The model brings into focus three important coefficients namely the exchange coefficient, the convection coefficient and the dispersion coefficient. The exchange co- efficient exists due to interphase mass transfer. The effects of reaction rate parameter, ? porous parameter, ? and Brinkman number, ??, on the veloc- ity and thereby the convective and dispersion coefficients are discussed. The time-dependent dispersion coefficient and mean concentration distribution are computed and results are represented graphically for various values of ? ? and ??. The results have applications in heat exchangers, petroleum and chemical engineering problems, chromatography and bio-mechanical problems. -
-
Study on Effect of Overdraft facility on market liquidity and income of private banks in Bangalore
This Dissertation depicts about the use of overdraft facility by the business men/women as customers of the private banks and how it affects the liquidity status and income of those private banks in Bangalore. This study helps the private bankers to identify the financial changes in the annual reports supported by statistical tools depicting the significant changes in relation to market liquidity and the income of the private banks. An overdraft allows an individual to continue withdrawing money even if the account has no funds in it and the bank will cover the checks which would otherwise bounce. The interest on the outstanding balance of an overdraft loan often is lower than credit cards. Market Liquidity is an asset's ability to be sold without causing a significant movement in the price and with minimum loss of value. Referring this meaning to the banks, overdraft plays a small part in changing the interest rates and also incurring a very minimal expense to maintain the OD account for the customers among the banks compared to cash credits and loan repayable on demand which are the major reasons for the influence on bank rates. In order to provide for the overdraft facility to the customers, even though for period of 22 days up to 45 days depending on the respective banks policies, banks must maintain a ready source to compensate the customers demand to withdraw beyond a nil balance. Thus Total Deposits are considered to represent the market liquidity of the banks. Income of private banks mainly in connection to the topic of the study considers only the interest earned on the overdraft for approximate comparison between the overdraft balance and interest earned on it. Thus giving no grounds for confusions as to why net profit or income earned through other sources is not considered. Reason for taking the liquidity and income to compare it with overdraft is that all three factors are of shorts terms in nature. It gives a common ground for significant comparison. It also provides appropriate data for correct statistical analysis giving accurate result. While increase in overdraft balance increases the interest amount earned on it or the banks have to increase the deposits to provide for the increasing overdraft balances. Other than the problem of the study, smooth or turbulent financial periods, behaviour of funds rate in response to declining required reserves, political scandals, bad cheques etc. are the various factors practically influencing the overdraft to affect the private banks market liquidity and income The scope of the study reckons to give the results as an answer for various queries of not only to the selected sample private banks but also to other banks that are providing the overdraft facility. It also helps the other researchers to carry on the further study. The hypothesis is to prove whether or not the overdraft affects the market liquidity and income. Sample size N=20 taken for data analysis includes the five years of the three variables of the study from 17 NSE Listed and 3 non listed private banks located in Bangalore which are available from annual reports the websites of sample banks, pay sites like report junction and CMIE-business beacon. This sample size is accumulated through convenient sampling of non-probabilistic sampling technique. Mainly Correlation is used as Statistical Technique for analysis and other than that, financial analytical tools are also employed i.e. Growth analysis, Peer group comparison and Industrial benchmarking. Through correlation analysis, findings are drawn that the effect of overdraft on market liquidity and as well as the effect of overdraft on income of the 20 banks are highly significant (p<0.01). Thus, the null hypothesis 1 and 2which shows that overdraft does not affect the market liquidity and income is proved otherwise. Increase in overdraft does affect the market liquidity and income positively. -
Study on Graphs Associated with Groups
In this dissertation, the notions of non-inverse graphs, order sum graphs and coset newlinecomponent graphs associated with groups are introduced. These graphs are simple graphs whose vertices are the elements of the group and the adjacency between the vertices depends on certain properties of the group concerned. Vertices belonging to non-inverse graphs are adjacent if they are not inverses of each other in the group. The vertices in order sum graphs are adjacent if the sum of their orders is strictly greater than the order of the group. The vertices belonging to the coset component graphs are adjacent if their left cosets or right cosets of the subgroups of groups are equal. These algebraic graphs are studied in detail in terms of their structural characteristics, parametric properties and spectral properties. Various characterisations of these graphs are obtained in the study concerned. These notions are further extended to the concept of signed graphs and domination. Properties of signed graphs such as balance, clusterability, consistency, sign-compatibility and so on are investigated for these algebraic signed graphs. The relations between various types of domination are obtained for non-inverse graphs, order sum graphs, complement and line graphs of order sum graphs. -
-
Study On Impact of Employee Retention Strategies on Employee Turnover in IT IndustryAn Exploratory Study in Bangalore
Employee Turnover is a major challenge faced by the companies globally. Employee Turnover is predominant not only in IT sector, but in other sectors as well. This study has focused in IT sector. Employees are the assets of any organization. Organizations are striving to retain their talents by implementing effective retention strategies. High Employee Turnover would subsequently have an impact on productivity and sustainability of the organization. There are two types of Employee Turnover ?? functional and dysfunctional. When productive employees leave the organization, it is said to be dysfunctional turnover and when the poor performers leave, it is called functional turnover. The focus of this study was dysfunctional turnover. Dysfunctional turnover is the concern of HR managers. When an employee leaves, it takes approximately eight weeks for this position to be replaced and in the meantime, productivity suffers. Causes and consequences of the Employee Turnover is mentioned in detail in Chapter 2. This study is an attempt to understand the impact of Retention Strategies on Employee Turnover in IT sector in India. Bangalore, being the IT hub of India, was chosen as the location of the study. Results of the study showed that Retention Strategies has an impact on Employee Turnover. Other variables such as Welfare Benefits, Personal Satisfaction and Organization Culture, which are said to be associated with the Employee Turnover were also investigated as a part of this study. -
Study on nonlinear convective flow of hybrid nanofluids in an annulus
In this modern fluid field technology, hybrid nanofluids are of great interest to researchers due to their improved thermal properties which provide a superior improvement in heat transfer compared to nanofluids. The hybrid nanofluid flow in an annular geometry finds its relevance in engineering and material manufacturing processes such as heat exchangers, nuclear power plants, hot rolling, and heat storage systems due to their high heat transport rate. Since these devices are operated at moderate and very high temperatures adopting linear Boussinesq approximation becomes inappropriate. Owing to this, the present research is devoted to the study of flow, heat, and mass transport characteristics of hybrid nanofluid in an annulus including the effects of radial/transversal magnetic field, thermal radiation, exponential space-related heat source, uniform/non-uniform heat source and variable thermophysical properties under the nonlinear Boussinesq approximation. The fundamental equations are obtained from the laws of conservation of mass, momentum, and energy. The dimensionless governing nonlinear equations are treated analytically/numerically. Further, the sensitivity analysis using response surface methodology (RSM) is performed to enhance the understanding of heat and mass transport behavior. The significance of various flow parameters (involving in the problem) on the flow structure, thermal model, concentration field, heat, and mass transport rate are analysed through 2D/3D-surface plots and discussed quantitatively. -
STUDY ON ORGANIZATIONAL CULTURE IN RELATION TO HUMAN RESOURCE MANAGEMENT PRACTICES IN HOTEL INDUSTRY IN BANGALORE
This research focuses and examines the relationship between organizational culture and human resource management practices in hotel industry in Bangalore. Organizational culture is palpable in any organization which has a diversified work force. Hotel industry is built with employees with various values and beliefs. These factors reflect in the culture and are related with the various human resource management practices. There is a significant relationship between organizational culture and human resource management practices in the hotel industry in Bangalore. There were eleven dimensions of organizational culture and thirteen dimensions of human resource management practices that were considered for examining the relationship between organizational culture and human resource management practices. The sample for the study was 135 mid-level managers of different category of hotels in the geographical location of Bangalore. Organizational culture survey scale developed by Pareek, U. (2003) and human resource management practices scale developed by Sebastian, S., & Patrick, H. A. (2010) was administered for this study. This research concludes by the finding fact that there is significant relationship between organizational culture and human resource management practices in the hotel industry. The study also shows that the culture in hotel industry is narcissistic. Keywords: Organizational culture, Human resource management practices, hotel industry -
STUDY ON SENSE OF HUMOR AND WORK CULTURE IN HOTEL INDUSTRY IN BANGALORE
This research focuses two fundamental aspects of sense of humor and work culture in a hotel setting. Work culture is a complex construct in hotels, consisting of different attitudes, perceptions, values and beliefs and plays a significant role in moderating the relationship between sense of humor and work culture. The present investigation was carried out on 156 employees (managers, middle and front line staff)of different private sector hotels in Bangalore. Participants age range was 21 years to 50 years. The major objective of this study was to investigate the relationship between sense of humor and work culture among in hotel industry. Work opinion survey scale developed by Zeynep Aycan (2000) and for sense of humor a seven point scale developed by Paul Mc Ghee was administered. This research concludes that even though the interest in sense of humor by employees has been sporadic, sense of humor remains a pervasive and important topic and has potential of providing significant insights into management and work culture. Keywords: sense of humor, work culture, hotel industry -
STUDY ON THE SIMILARITIES IN THE NARRATIVE TECHNIQUES: A COMPARATIVE CONTENT ANALYSIS ON KOLLYWOOD TO HOLLYWOOD
The study analyses the Narration techniques that were used in the Hollywood movies, which were taken from the Tamizh cinema, which is known as Kollywood. The researcher used content analysis to find out the similarities and common similarities from the four films, two from Tamizh and two from English. Through the content analysis and qualitative research we can find out that the plot or the ways of stories were moving in the same direction and the techniques in the narrative that makes the plot looks same. -
SUBJECTIVE EXPERIENCE OF HIGHLY HYPNOTIZABLE INDIVIDUALS DURING HYPNOSIS SUBJECTIVE EXPERIENCE OF HIGHLY HYPNOTIZABLE INDIVIDUALS DURING HYPNOSIS
The aim of the present study was to examine the subjective experience of highly hypnotizable individuals during hypnosis. The study conducted also examined the structure and pattern of subjective experience among highly hypnotizable individuals. Further investigations were carried out regarding the dimensions of experience which are common and unique to highly hypnotizable individuals. The sample consisted of 10 post graduate college students. Among the 50 participants who volunteered for phase I of the study, 10 highly hypnotizable individuals were selected for phase II. The tools used in phase I of the study were General Health Questionnaire - 12 (GHQ-12), and Harvard Group Scale of Hypnotic Susceptibility- Form A (HGSHS: A). The Phenomenology Consciousness Inventory- Hypnotic Assessment Procedure (PCI-HAP) was used to examine the subjective experience of highly hypnotizable individuals in phase II of the study. Assessment was carried out in group sessions for phase I and individual sessions for phase II were conducted in the college premises. Data were analysed using descriptive statistics such as mean, standard deviation, frequency and percentage, to analyze the personal data of respondents and dimensions of subjective experience. Profile analysis was done using PCI-HAP interpretative manual. Collective analysis of profiles was executed through scaled phenomenological intensity profiles. Thematic analysis was carried out for the subjective responses given by the respondents that described their experience of the vacation (hypnotic dream imagery), trying to open their eyes (ideomotor challenge), two minute quiet period (PCI imagery), feelings after hypnosis, negative effects during or after hypnosis, how hypnotized they feel they became (depth experience). The results show that highly hypnotizable individuals experience distinct patterns of phenomenological experience during hypnosis. They differed in their trance typology profile, suggesting the existence of various subtypes among this population. Half of them were visualizers experiencing high intensity of vivid imagery, self awareness and intact memory. Highly experienced dimension by the group was absorption, highlighting as an important correlate of hypnotizability. The least experienced dimension was volitional control, suggesting less loss of phenomenological control during the PCI-HAP. Implications of the study are discussed. Keywords: Hypnotizability, Hypnotic susceptibility, Subjective experience, Hypnotic response, Phenomenology Consciousness Inventory (PCI). -
Subjectivity analysis using social opinion mining on stress and strain during covid 19 pandemic
The psychological health of several people across the globe has been under great risk newlineas a result of the COVID-19 pandemic that shook the entire world. The ubiquitous newlinepandemic had created a tectonic shift in everyone s life. The lives of people have newlineundergone a severe transition with strict measures like lockdown and social distancing newlineimposed by governments of several countries to stop the spread of the viral infections. newlineCoping through the adverse situation has been quite onerous causing stress among the people. The transition from normal life to a life filled with several restrictions has newlinebeen stressful and strenuous. A state of emotionally or physically being tensed can be newlineconsidered as stress. Stress can cause frustration, depression, nervousness and other mental health issues. Stress also leads to strain. Social media networking sites like newlineX(Earlier Twitter) and Facebook have emerged to become popular. During the times of lockdown and social distancing the social media networking sites have been a great newlineplatform for expressing opinions, exchange of ideas and thoughts. People have expressed their stressful situations and coping mechanisms through tweets , Facebook newlineposts and several other social media sites during the pandemic. The underlying stress newlineand strain of a person can be analyzed through the posts shared by the person through the social media sites. Early detection of the prevalence of the stress and strain is important, as medical help can be sought quickly and the person affected can be back to normalcy. Subjectivity analysis is the study that deals with analyzing the emotions, feelings, attitudes and polarity of opinions considering any subject matter. newlineThe present research focuses on subjectivity analysis through social opinion mining newlineduring the COVID-19 pandemic. Social opinion mining incorporates Natural Language Processing and Computational Linguistics that identifies the subjectivity across the posts of social media.
-
Subjectivity Analysis Using Social Opinion on Stress and Strain During Covid-19 Pandemic
The psychological health of several people across the globe has been under great risk newlineas a result of the COVID-19 pandemic that shook the entire world. The ubiquitous newlinepandemic had created a tectonic shift in everyone s life. The lives of people have newlineundergone a severe transition with strict measures like lockdown and social distancing newlineimposed by governments of several countries to stop the spread of the viral infections. newlineCoping through the adverse situation has been quite onerous causing stress among the people. The transition from normal life to a life filled with several restrictions has newlinebeen stressful and strenuous. A state of emotionally or physically being tensed can be newlineconsidered as stress. Stress can cause frustration, depression, nervousness and other mental health issues. Stress also leads to strain. Social media networking sites like newlineX(Earlier Twitter) and Facebook have emerged to become popular. During the times of lockdown and social distancing the social media networking sites have been a great newlineplatform for expressing opinions, exchange of ideas and thoughts. People have expressed their stressful situations and coping mechanisms through tweets , Facebook newlineposts and several other social media sites during the pandemic. The underlying stress newlineand strain of a person can be analyzed through the posts shared by the person through the social media sites. Early detection of the prevalence of the stress and strain is important, as medical help can be sought quickly and the person affected can be back to normalcy. Subjectivity analysis is the study that deals with analyzing the emotions, feelings, attitudes and polarity of opinions considering any subject matter. newlineThe present research focuses on subjectivity analysis through social opinion mining newlineduring the COVID-19 pandemic. Social opinion mining incorporates Natural Language Processing and Computational Linguistics that identifies the subjectivity across the posts of social media. -
SUBSTANCE USE IN WESTERN MUSIC VIDEOS- A comparative study
The approach towards the use of substances in western music videos has been thoroughly investigated by a lot of medical researchers. The main objectives were to produce evidence of the effect of television or any visual medium on the young minds. Most of these studies have come to conclusions that these mediums have enormous effect on the youth. This particular study compares four genres of music videos from the year 1991 till present. Each of these videos qualifies to be taken as subjects of research by their popularity in their particular time period. The four genres are hard rock, country, hip-hop and rap music videos. The main objectives are to find which medium carries such videos the most, which substances are mainly used in each genre and has it increase or decrease over the decade. There are various conclusions made from the findings of the study. New media has indeed made its presence in todays generation. Also, increase in promotion of new illegal substances over television and new media like YouTube is taking place with the increase of new cultures coming out of age.