Ion probing with Luminescent PbS Quantum dots in PVA

The PbS quantum dots synthesized in PVA are used to investigate their photoluminescence (PL) response to various ions such as Zn, Cd, Hg, Ag, Cu, Fe, Mn, Co, Cr and Ni ions. The enhancement in the photoluminescence intensity is observed with specific ions namely Zn, Cd, Hg and Ag. Among these four ions, the PL response to Hg and Ag even at sub-micro-molar concentrations is quite high, approximately an order of magnitude higher than Zn and Cd. It is interesting to observe that the change in Pb and S molar ratio has profound effect on the selectivity of these ions. The samples prepared under excess of S are quite effective compared to Pb. Indeed, the later one has hardly any effect on the photoluminescence response. These results also indicate that the sensitivity of these QDs could be fine-tuned by controlling the S concentration at the surface. Contrary to the above, Cu, Fe and Co quenches the photoluminescence. Another interesting property of PbS in PVA observed is photo-brightening mechanism due to the curing of the polymer with laser. However, the presence of excess ions at the surface changes its property to photo-darkening/brightening that depends on the direction of carrier transfer mechanism (from QDs to the surface adsorbed metal ions or vice-versa), which is an interesting feature for metal ion detectivity.

A risk-estimation-based formulation for speech enhancement and its relation to Wiener filtering

The goal of speech enhancement algorithms is to provide an estimate of clean speech starting from noisy observations. The often-employed cost function is the mean square error (MSE). However, the MSE can never be computed in practice. Therefore, it becomes necessary to find practical alternatives to the MSE. In image denoising problems, the cost function (also referred to as risk) is often replaced by an unbiased estimator. Motivated by this approach, we reformulate the problem of speech enhancement from the perspective of risk minimization. Some recent contributions in risk estimation have employed Stein's unbiased risk estimator (SURE) together with a parametric denoising function, which is a linear expansion of threshold/bases (LET). We show that the first-order case of SURE-LET results in a Wiener-filter type solution if the denoising function is made frequency-dependent. We also provide enhancement results obtained with both techniques and characterize the improvement by means of local as well as global SNR calculations.

Corporate social responsibilities of Indian public sector enterprises-a case study of Bharat Heavy Electricals Limited (BHEL)

The high level of public accountability attached to Public Sector Enterprises as a result of public ownership makes them socially responsible. The Committee of Public Undertakings in 1992 examined the issue relating to social obligations of Central Public Sector Enterprises and observed that ``being part of the `State', every Public Sector enterprise has a moral responsibility to play an active role in discharging the social obligations endowed on a welfare state, subject to the financial health of the enterprise''. It issued the Corporate Social Responsibility Guidelines in 2010 where all Central Public Enterprises, through a Board Resolution, are mandated to create a CSR budget as a specified percentage of net profit of the previous year. This paper examines the CSR activities of the biggest engineering public sector organization in India, Bharath Heavy Electricals Limited. The objectives are twofold, one, to develop a case study of the organization about the funds allocated and utilized for various CSR activities, and two, to examine its status with regard to other organizations, the 2010 guidelines, and the local socio-economic development. Secondary data analysis results show three interesting trends. One, it reveals increasing organizational social orientation with the formal guidelines in place. Two, Firms can no longer continue to exploit environmental resources and escape from their responsibilities by acting separate entities regardless of the interest of the society and Three the thrust of CSR in public sector is on inclusive growth, sustainable development and capacity building with due attention to the socio-economic needs of the neglected and marginalized sections of the society.

Buddhism and the earth : environmental thought in early Buddhist philosophy

Introduction Fundamental to the philosophy of Buddhism, is the insight that there is "unsatisfactohness" (dukkha) in the world and that it can be eliminated through the practice of the Noble Eight Fold Path. Buddhism also maintains that the world as we experience and entities that exist are bereft of any substantiality. Instead existence is manifest through dependent origination. All things are conditional; nothing is permanent. However, inherent in this dependent existence is the interconnectedness of all beings and their subjection to the cosmic law of karma. Part of cultivating the Eight Fold path includes a deep compassion for all other living things, 'trapped' within this cycle of dependent origination. This compassion or empathy (karuna) is crucial to the Buddhist path to enlightenment. It is this emphasis on karuna that shows itself in Mahayana Buddhism with respect to the theory of the boddhisatva (or Buddha-to-be) since the boddhisatva willingly postpones his/her own enlightenment to help others on the same path. One of the ramifications of the theory of dependent origination is that there is no anthropocentric bias placed on humans over the natural world. Paradoxically the doctrine of non-self becomes an ontology within Buddhism, culminating in the Mayahana realization that a common boundary exists between samsara and nirvana. Essential to this ontology is the life of dharma or a moral life. Ethics is not separated from ontology. As my thesis will show, this basic outlook of Buddhism has implications toward our understanding of the Buddhist world-view with respect to the current human predicament concerning the environment. While humans are the only ones who can 4 attain "Buddhahood", it is because of our ability to understand what it means to follow the Eight fold path and act accordingly. Because of the interconnectedness of all entities {dharmas), there is an ontological necessity to eliminate suffering and 'save the earth' because if we allow the earth to suffer, we ALL suffer. This can be understood as an ethical outlook which can be applied to our interaction with and treatment of the natural environment or environment in the broadest sense, not just trees plants rocks etc. It is an approach to samsara and all within it. It has been argued that there is no ontology in Buddhism due to its doctrine of "non-self". However, it is a goal of this thesis to argue that there does exist an original ontology in Buddhism; that according to it, the nature of Being is essentially neither "Being nor non-being nor not non-being" as illustrated by Nagarjuna. Within this ontology is engrained an ethic or 'right path' (samma marga) that is fundamental to our being and this includes a compassionate relationship to our environment. In this dissertation I endeavour to trace the implications that the Buddhist worldview has for the environmental issues that assail us in our age of technology. I will explore questions such as: can the Buddhist way of thinking help us comprehend and possibly resolve the environmental problems of our day and age? Are there any current environmental theories which are comparable to or share common ground with the classical Buddhist doctrines? I will elucidate some fundamental doctrines of early Buddhism from an environmental perspective as well as identify some comparable modern environmental theories such as deep ecology and general systems theory, that seem to share in the wisdom of classical Buddhism and have much to gain from a deeper appreciation of Buddhism.

Emptiness and becoming : integrating Madhyamika Buddhism and process philosophy

Beginning with a comparison of process philosophy and Madhyamika Buddhism -focussing in particular on Charles Hartshorne and Nagarjuna - which seeks to find points of similarity and difference, this thesis goes on to ask whether the differences are disagreements or complementary insights that may be integrated by means of a hermeneutical framework which can facilitate the enrichment of both systems. It is argued that process philosophy's method of creative synthesis and Madhyamika's method of negative dialectics are complementary rather than rival methods, because: (1) the Madhyamika bi-negation of symmetrical internal and external relations is complemented by process philosophy's argument that asymmetrical relations have primacy, which can be integrated into a theory of 'asymmetrical interdependence'; (2) the Madhyamika bi-negation of being and non-being is complemented by process philosophy's argument that becoming has primacy; (3) Madhyamika's emptiness (or openness) and process philosophy's creativity are complementary ideas that can be integrated into a ‘creative emptiness’; (4) Madhyamika's deconstruction of theism and acceptance of a conventional (and thus empty) ‘Cosmic Buddha-Bodhisattva’ and process philosophy's panentheism are complementary and can be integrated in the idea of an ‘empty God’; (5) The creative emptiness and the empty God are two different but complementary ultimates - the ultimate activity and the ultimate actuality; (6) Madhyamika’s two truths -conventional (empty world) and ultimate (emptiness) - can be enriched by expanding the conventional to include ultimate actuality (empty God), and not subordinating the conventional to the ultimate; (7) process philosophy can be similarly enriched by meditating on creative emptiness, which reveals the empty God-world, which is not dominant vis-a-vis creative emptiness. An attempt is made to develop a hermeneutical framework for the comparison and integration of Madhyamika and process thought, which can also be used to construct a general theory of worldviews and a theory of interreligious dialogue. Finally, the practical applications of the integration of process thought and Madhyamika Buddhism are explored, focussing on ethical and socio-political issues and how the integration of the two systems can be used to advantage in these contexts.

Why is there nothing rather than something? An essay in the comparative metaphysics of nonbeing

The paper is an essay in the comparative metaphysics of nothingness that begins by pondering why Leibniz thought of the opposite question as the preeminent one. In Eastern philosophical thought, like the numeral ‘zero’ (śānya) that Indian mathematicians first discovered, nothingness as non-being looms large and serves as the first quiver on the imponderables they seem to have encountered (e.g. ‘In the beginning was neither non-being nor being’ RgVeda X.129). The concept of non-being and its permutations of nothing, negation, nullity, receive more sophisticated treatment in the works of grammarians, ritual hermeneuticians, logicians, and their dialectical adversaries, variously across Jaina and Buddhist schools, in respect of the function of negation /the negative copula, nãn, fraying into ontologies of non-existence and extinction; not least also the suggestive tropes that tend to arrest rather than affirm the inexorable being-there of something. After some passing references to interests in non-being and nothingness in contemporary (Western) thinking, the paper dwells at some length on Heidegger’s extensive treatment of nothingness in his 1927 inaugural lecture ‘Was ist Metaphysik?’, published later as What is Metaphysics? The essay however distances itself from any pretensions toward a doctrine of Nihilism.