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Linear and non linear electroconvection in a micropolar fluid /
This thesis presents a theoretical study of linear and non-linear analyses of Rayleigh–Bénard–Marangoni/Rayleigh–Bénard electro convection in a micropolar fluid. The effects of non-uniform basic temperature gradient, suction–injection combination and gravity modulation have been studied in the presence of electric field. The effect of heat transfer in a micropolar fluid in the presence of electric field is also studied and results are presented graphically and discussed qualitatively. These problems assume greater importance in geophysics, astrophysics, oceanography, and engineering and in space situations with g-jitter connected with gravity stimulation study. Keeping in mind the importance and relevance of externally controlled internal convection in a micropolar liquid. -
Study of magnetoconvection with maxwell cattaneo law /
This thesis deals with the study of Rayleigh-Bénard-convection in a Newtonian fluid and micropolar fluid by replacing the classical Fourier law by non-classical Maxwell-Cattaneo heat flux law. The effects of second sound, non-uniform basic temperature gradients, suctioninjection-combination, temperature modulation and gravity modulation in
presence of external constraints like magnetic field and rotation are studied. The problems investigated in this thesis throw light on externally controlled convection in Newtonian and micropolar fluids in the presence of Maxwell-Cattaneo law. The problems investigated in this thesis deal with practical problems with very large heat fluxes and/or short time duration. With this motivation, we investigate in this thesis five problems and their summary is given below. (i) Effects of Coriolis force and non-uniform basic temperature gradients on the onset of Rayleigh-Bénard-Chandrasekhar convection with Maxwell-Cattaneo law The effect of non-uniform temperature gradient on RayleighBénard-Chandrasekhar convection in a rotating Newtonian fluid with
Maxwell-Cattaneo law is studied using the Galerkin technique. The eigenvalues is obtained for free-free, rigid-free and rigid-rigid velocity boundary combinations with isothermal and adiabatic boundaries. A linear stability analysis is performed. The influence of various parameters on the onset of convection has been analyzed. One linear and fiveix non-linear temperature profiles are considered and their comparative influence on onset is discussed. It is found that the results are noteworthy
at short times and the critical eigenvalues are less than the classical ones. It is shown that the system having magnetic field will delay in the onset of instability. In general, it is observed that step function and inverted parabolic temperature profile are the most destabilizing and stabilizing profiles. The range of values of the parameters of the problem for which oscillatory convection in the case of free-free isothermal boundary exists is also discussed. (ii) The effect of temperature modulation on the onset of RayleighBénard-Chandrasekhar convection using Maxwell-Cattaneo law The effect of imposed time-periodic boundary temperature (ITBT, also called temperature modulation) and magnetic field at the onset of Rayleigh-Bénard convection is investigated by making a linear analysis. The classical Fourier heat law is replaced by the non-classical MaxwellCattaneo law. The venezian approach is adopted in arriving at the critical Rayleigh number and wave number for small amplitude of ITBT. Three
cases of oscillating temperature field are examined: (a) symmetric, so that the wall temperatures are modulated in-phase, (b) asymmetric, corresponding to out-of-phase modulation and (c) only the lower wall is modulated. The temperature modulation is shown to give rise to sub-critical motion. The shift in the critical Rayleigh number is calculated
as a function of frequency and it is found that it is possible to advance or delay the onset of convection by time modulation of the wall temperatures. It is shown that the system is more stable when the boundary temperatures are modulated out of phase.x
(iii) The effect of gravity modulation on the onset of RayleighBénard-Chandrasekhar convection using Maxwell-Cattaneo law The effect of gravity modulation and magnetic field at the onset of Rayleigh-Bénard-Chandrasekhar convection is investigated by making a regular perturbation technique. The stability of the horizontal fluid layer heated from below is examined by assuming time-periodic body acceleration called g-jitter, which normally occurs in satellites and in vehicles connected with microgravity simulation studies. The venezian
approach is adopted in arriving at the critical Rayleigh number and wave number for small amplitude of gravity modulation. The shift in the critical Rayleigh number is calculated as a function of frequency of modulation. It is observed that gravity modulation leads to delayed convection. (iv) The effect of suction-injection-combination (SIC) on the onset of Rayleigh-Bénard-Chandrasekhar convection in a micropolar fluid with Maxwell-Cattaneo law The effect of suction-injection-combination (SIC) on the onset of Rayleigh-Bénard-Chandrasekhar convection in a micropolar fluid with Maxwell-Cattaneo law is studied using the Galerkin technique. The eigenvalue is obtained for free-free, rigid-free and rigid-rigid velocity boundary combinations with isothermal and adiabatic on the spinvanishing boundaries. A linear stability analysis is performed. The influence of various micropolar fluid parameters on the onset of convection has been analyzed. It is found that the effect of Prandtl number on the stability of the system is dependent on the SIC beingxi pro-gravity or anti-gravity. A similar Pe-sensitivity is found in respect of the critical wave number. The problem suggests an elegant method of external control of internal convection. (v) The effect of non-uniform temperature gradients on RayleighBénard-Chandrasekhar convection in a micropolar fluid with
Maxwell-Cattaneo law The effect of non-uniform temperature gradient on RayleighBénard-Chandrasekhar convection in a micropolar fluid with MaxwellCattaneo law is studied using the Galerkin technique. The eigenvalue is obtained for free-free, rigid-free and rigid-rigid velocity boundary combinations with isothermal and adiabatic on the spin-vanishing boundaries. A linear stability analysis is performed. The influence of various micropolar fluid parameters on the onset of convection has been
analyzed. Six different non-uniform temperature profiles are considered their comparative influence on onset is discussed. It is observed that the micropolar fluid layer heated from below is more stable compared to the classical Newtonian fluid layer. -
Study of single and two component convection in micropolar liquid /
In this thesis, we study linear and non-linear analysis of RayleighBénard and double diffusive convection in a micropolar liquid. The effect of non-uniform basic temperature gradient, non-uniform basic concentration gradient, temperature modulation at the boundary and gravity modulation are studied.
The problem investigated in this thesis through a light on externally controlled internal convection in a micropolar liquid. The problems investigated in this thesis have possible application in geophysics, astrophysics, oceanography engineering and in space situations with gjitter connected with gravity stimulation study. With this motivation, we investigate in this thesis four problems and their summary is given below one by one.
(i) EFFECT OF GRAVITY MODULATION ON HEAT
TRANSFER BY RAYLEIGH-BÉNARD CONVECTION IN A
MICROPOLAR LIQUID The vertical oscillation, or g-jitter or gravity modulation, is known to appear in the situation of the satellite. In the laboratory, Rayleigh-Bénard system subjected to time-periodic vertical oscillations may be useful in regulating the onset of convection and heat transfer. This aspect is also in
focus in the thesis. In this problem the effect of time-periodic body force or grtavity modulation on the onset of Rayleigh-Bénard convection in a micropolar liquid is investigated. The linear and non-linear analyses are performed. The linear theory is based on normal mode analysis and perturbation method. The expression for correction Rayleigh number is obtained as a function of frequency of modulation and other micropolar
liquid parameters. The non-linear analysis is based on the truncated Fourier series representation. The resulting non-autonomous Lorenzvii model is solved numerically to quantify the heat transport. It is observed that the gravity modulation leads to delayed convection and reduced heat transfer.
(ii) LINEAR AND WEAKLY NON- LINEAR STABILITY
ANALYSIS OF DOUBLE-DIFFUSIVE CONVECTION IN A
MICROPOLAR LIQUID The linear and non-linear stability analysis of double diffusive convection in a micropolar liquid layer heated and saluted below and cooled from above is studied. The linear and non-linear analyses are respectively based on normal mode technique and truncated
representation of Fourier series. The influence of various parameters on the onset of convection has been analyzed in the linear case. The resulting autonomous Lorenz model obtained in non-linear analysis is solved numerically to quantify the heat and mass transforms through Nusselt and Sherwood number. It is observed that the increase in coupling parameter, micropolar heat conduction parameter and solutal Rayleigh number
increases the heat and mass transfer. (iii) THE EFFECT OF NON - UNIFORM TEMPERATURE / CONCENTRTION DISTRIBUTION ON THE ONSET OF DOUBLE-DIFFUSIVE CONVECTION IN A MICROPOLAR LIQUID The effect of non-uniform temperature/concentration distribution on the onset of double diffusive convection in a micropolar liquid layer heated and soluted below and cooled from above between two parallel
plates of infinite extend separated by a thin layer is studied using linear stability analysis based on normal mode technique. The eigen value is obtained for free-free, rigid-free, rigid-rigid, velocity boundary conditions with isothermal temperature boundary conditions using Galerkian method. It is observed that by choosing the appropriate non-uniformviii temperature or concentration gradient it is possible to advance or delay
the onset of double diffusive convection. (iv) EFFECT OF TEMPERATURE MODULATION ON THE ONSET OF DOUBLE – DIFFUSIVE CONVECTION IN A MICROPOLAR LIQUID
The effect of temperature modulation on the onset of double-diffusive convection in a micropolar liquid is investigated by making a linear stability analysis. The stability of a horizontal layer of fluid heated from below is examined when, in addition to a steady temperature difference between the walls of the layer, a time-periodic sinusoidal perturbation is applied to the wall temperatures. The Venezian approach is adopted in arriving at the critical Rayleigh and wave numbers for small amplitude
temperature. -
A comparison of distressed and non distressed married couples on marital quality emotional intelligence and conflict resolution styles /
Aim: To compare and study the marital quality, emotional intelligence and conflict resolution styles of distressed and non-distressed married couples; and to examine the interrelationships between these variables. Method: The study utilized a cross sectional, between group, mixed method research design. The sample consisted of 43 heterosexual married couples (N=86) in non-clinical settings, in the age range of 20-60 years, living in Bangalore, who met the inclusion and exclusion criteria, were
recruited through purposive/ snowball sampling. The participants were administered a demographic data sheet, the Marital Quality Scale (Shah, 1995), the Emotional Intelligence Scale (Schutte, Malouff, Hall, Haggerty, Cooper, & Golden, 1998), the Conflict Resolution Scale (Kurdek, 1994) and a Semi-structured Interview Schedule for qualitative data (prepared by the researcher). Quantitative and Qualitative analysis was carried out. The MQS cutoff score of 80 was used to divide the sample into distressed and nondistressed couples. Results: The two groups significantly differed on the conflict resolution styles. A significant relationship was found between marital quality and conflict resolution styles of distressed as well as non distressed group. There was a significant positive relationship between withdrawal as a
conflict resolution style and marital quality among distressed wives. Correlations between marital quality and conflict resolution styles among non-distressed couples showed that withdrawal had a significant positive relationship with the marital quality of the husband. From the correlation between the emotional intelligence and conflict resolution styles of
distressed couples, compliance had a significant positive relationship with the wife’s emotional intelligence. Among non-distressed wives conflictxii engagement was negatively correlated and positive problem solving was positively correlated with their emotional intelligence. Through the thematic analysis, multiple themes were identified as factors that are fundamental for a happy and long-term marriage and at the same time reveal the factors that can be detrimental to a successful marital
relationship. These themes, including the importance of emotional intelligence in marital quality and ways of conflict resolution were classified. The study has implications for clinical practice and marital research. The study findings can be used by counsellors and therapists in helping distressed couples, and for premarital counselling work with individuals and dating couples to improve the chances of their marital quality. The primary limitation of the study was its small sample size that limits the
ability to generalize the findings of the study. For future research a larger sample size can be considered to study the influence and impact in depth. The variables can be studied in different cultures to understand the cultural differences. -
Fluorescence diffuse optical tomography: Synthesis, characterization and imaging of a novel target specific near infra-red contrast agent for breast cancer detection /
A paradigm shift is seen for cancer treatment since many decades in developing safe and efficient techniques to prevent, detect, treat and cure cancer worldwide. However, there is still a long way to stabilize the rate of cancer occurrence. Breast cancer is found to be among the top three cancer types in terms of incidence and fifth in terms of mortality. An estimate of 2.1 million new cases of breast cancer was recorded in the International Agency for Research on Cancer [IARC] Report 2018. Close to a half (43.6%) of all breast cancers were diagnosed within the Asia-Pacific region (approximately 911014 cases), with the greatest number of those occurring in China, Japan and Indonesia. Although the prognosis is relatively favorable, at least in more developed countries, early diagnosis is the lifesaver. Diffuse Optical Tomography (DOT) is one of the emerging diagnostic tools for early detection of breast cancer. It uses near infra-red (NIR) light to probe human soft tissues and is capable of continuous monitoring of the patient. DOT is cheaper, compact and uses non-ionizing radiation unlike its counterparts like CT-Scan, Mammogram and PET scan. The potential of DOT can be enhanced by using a NIR exogenous contrast agents, and the system is known as Fluorescence-DOT (FDOT). Indocyanine Green (ICG) is a popular FDA approved dye available in the market which is explored for cancer detection using FDOT. But, with its non-specific nature, there was a need for a specific and functionally orientated dye to further improve the efficacy of FDOT imaging. -
Models for load forecasting and demand response /
Increasing pressure on the utilities to accommodate energy efficiency, load management and progress in advanced technology has led to transformations of existing grids into smarter grids. With the development of Smart Grid Technology and the integration of smart meters it is possible to control the equipment installed at the consumer site. Creating awareness among the end users to participate in load management programs instead of capacity addition is the best solution for maintaining the stability in the grid. Utilities can also encourage consumer participation in load control activities. They can ensure that power is given to a consumer during his priority time. For this, loads have to be categorized, prioritized and then considered for load shedding so that revenue loss and social impacts of load shedding are minimized. It would be beneficial if a consumer's load is not completely shed during load shedding. Amount of power that is shed from a consumer can be limited and consumers can be allowed to adjust their loads based on the availability of power and get incentives from the utilities for their change in load pattern. Consumers are also benefited with the reduced energy charges on the consumed energy during these periods. -
Empirical evidence on usability of mobiles in healthcare /
Healthcare industry today has seen a lot of innovation and transformation like any other industry. With technological advancements it is growing leaps and bounds. One of the major challenges before the world today is effective management of diseases. The healthcare industry has been benefitted with the usage of information and communication technology (ICT). When integrated properly this technology has the potential to provide solutions to increased demands in quality, efficiency and improved workflow to help streamline healthcare operations. -
Relationship between competencies and performance of management teachers of B-schools in Bengaluru city /
The concept of competency mapping is an established practice in the corporate world for ages. It has been successful in contributing for performance management. The study was aimed to find out whether similar efforts can be made in management education. Researcher aimed to develop a competency mapping tool and to study the relationship between competencies and performance of B School faculty members in the city of Bengaluru. As an outcome of the study a competency mapping tool was developed with five key competency clusters namely Teaching Learning, Assessment Evaluation, Research Publication, Student Development and Administration Coordination. -
Synthesis of benzothiazinones, benzothiazines and their selenium analogues through novel synthetic routes /
Benzo fused N-heterocyclic scaffolds containing oxygen, sulphur or selenium have found wide interest in the field of drug-discovery. Among these N-heterocycles, benzothiazine, benzoxazine, benzoselenazine and benzothiazinone derivatives are a unique class of compounds and have a larger scope towards the development of efficient and simple synthetic methodologies for their synthesis with readily available substrates. -
Studies on thermal, structural, electrical and optical properties of Se-Te-Sb chalcogenide glasses /
Glasses, an intriguing state of matter, known to mankind since ages, have seen systematically reported investigations only in the 20th century. Of the various kinds of glasses such as silicates, oxides, halides, chalcogenide etc., a large spectrum of commercial and technological applications of chalcogenide glasses(ChG), have made them a subject of great interest and studied for more than four decades now. -
A study on the impact of foreign investment in infrastructure sector in India /
The growth of an economy is determined by the amount of investment made or the capital created in the economy. Capital creation happens when the economy has excess of income over expenditure, in other words, savings. Foreign Investment is a good source of fund for developing economies whose savings is low. -
A critical analysis of the law relating to elementary education in India viz-a-viz minimum level of learning /
The “demand for free and compulsory education” started in the British period. The framers directed that the object of Article 45 must be achieved within ten years of the commencement of the constitution. After several judicial strictures the Constitutional (Eighty Sixth) Amendment Act 2002 (Amendment Act, 2002) declared ‘education’ as a fundamental right. -
Linear and nonlinear convection in magnetic fluids /
The thesis deals with linear and nonlinear Rayleigh-Benard ferroconvection in a horizontal porous layer. Modified Darcy law is used to describe the fluid motion. The effect of chemical reaction, temperature modulation, gravity modulation and finite amplitudes on the onset of Darcy ferroconvection is considerd. The findings of the problems addressed in the thesis may come in handy for heat transfer application situations with ferromagnetic fluids as working medium. -
Development and standardization of a tool to assess spirituality in families for family based interventions /
The aim of the study was to develop and standardize a tool for family spiritual assessment. The sample consisted of 1502 Indian participants which included members from three religious backgrounds namely: Christianity, Hinduism and Islam. The data collected through face-to-face interview was analyzed using exploratory factor analysis (EFA), t-test and ANOVA. A five-item Likert-type tool developed was named as Family Spiritual Assessment Scale (FSAS) through a process of item development. -
A study on work engagement of secondary school teachers in relation to their psychological well-being, leadership behaviour of principals and organizational health /
Organizational success is determined by work engagement and psychological well-being of the workforce. Efficient leadership and a healthy teaching environment determine the professional conduct of school teachers. Work engagement not only reflects teachers’ performance but also implies the performance of pupils and the school. Work engagement depends on the congeniality of the working conditions. The present study explores work engagement of 516 secondary school teachers working in Bengaluru, India. -
A study on socio-economics impact of remittances on forward migrants household of the Tibetan refugees in India /
Migration and Development is an agenda of every country’s economic policy in recent time. Migration has been linked to the flow of remittances influencing socio-economic development particularly of developing countries. Studies on remittances have also reflected its positive side having potential effect at all levels including micro (households), macro (country) and meso (community) levels. The existing literature on remittance manifested the prominent role of remittance in enhancing livelihood of receiving households. Empirical study conducted on developing economies concluded that households receiving remittances are better off than those of non-receiving households. -
Empirical analysis of antecedents and mediators of student loyalty among undergraduate business students in Bangalore, India
The higher education sector has undergone major changes throughout India which has led to increase in competition for institutions in this sector. Thus, there is a need to find ways to attract and retain the potential and current students. Student loyalty is crucial to create sustainable competitive advantage. Student loyalty is widely accepted as a critical factor in the long term economic success of an educational institution that aims at positive recommendation (word of mouth) by students and attracting the students back to the institution for further studies. Review of literature reveals that service quality, price fairness, customer value, customer satisfaction and affective commitment are key antecedents to customer loyalty.