3,147 research outputs found
1988 Parry, Jonathan. Death in Banaras.
No full textRecordings of lectures, poster for the 1988 Lewis Henry Morgan Lectures, "Death and Exchange in Benares," by Jonathan P. Parry, presented April, 1988, and images of the book cover of Parry's "Death in Banaras."
Note: audio quality not guaranteed; lectures may need time to buffer before playing
Bloch (Maurice) Parry (Jonathan) éd Death and the Regeneration of Life
No full textThomas Louis-Vincent. Bloch (Maurice) Parry (Jonathan) éd Death and the Regeneration of Life. In: Archives de sciences sociales des religions, n°55/2, 1983. p. 211
The low-energy phenomenology of a supersymmetric extension of the standard model
No full textWe attempt to explore the relationship between low-energy phenomenology and the pattern of Yukawa couplings at high-energies. A working supersymmetric Pati-Salam model which fits all phenomenological constraints is constructed. This model is typical of a broad class of models and its predictions are representative of all models of this type. A χ2 analysis is used to determine points in parameter space where experimental measurements and bounds are most accurately reproduced. These best fit points are then be used to make predictions for unmeasured quantities such as neutrino mixing angles and lepton flavour violating decays. For example we find that the branching ratio for τ → μγ is very near its present experimental bound. In the context of this model we also study the degree of deviation from Yukawa unification observed by our best fit points. The effects of future experimental results upon the best fit regions of parameter space are also considered and we find that in some cases our allowed parameter space may be much reduced. We extend the study of our models predictions by investigating Higgs-mediated contribution to rare flavour changing neutral current processes and discuss the possibility of them being among the very first indirect signals of supersymmetry. We also study rare lepton flavour violating decays mediated by Higgs bosons discovering that in this case the Higgs contribution is sub-dominant and doesn’t hold such clear hopes for indirect discovery.</p
Thermocapillary approaches to the deliberate patterning of polymers
No full textThe phenomenon of thermocapillarity, the response of fluids to thermal gradients due to thermal alteration of their surface tension, was first reported over a century ago. Since then, research has focused generally on either the fundamentals or mitigation of this effect during the processing of materials. Only in the past two decades has the deliberate use of thermocapillary forces for the patterning of polymers been actively pursued, either for the ordering of internal structure or the introduction of topographic features. This review seeks to highlight this work and further identify directions for further investigation. In particular, while thermocapillary forces are often inextricably bound to other mechanisms, there are emerging directions in the deliberate coupling of forces to improve the capabilities of each mechanism. Further, the applications of thermocapillary patterning to polymer-nanoparticle composites has recently provided another promising route to active architectures.Peer reviewed
Focused Laser-Induced Marangoni Dewetting for Patterning Polymer Thin Films
No full textHighly-localized focused laser spike (FLaSk) heating of polymer thin films is a resist- and developer-free alternative to 2D laser direct write for creating patterns on the single micron or, by exploiting overlap effects, submicron scale. The massive temporal and spatial thermal gradients and resulting thermal Marangoni stresses generated by FLaSk are an effective means for the directed dewetting and patterning of such films. Here, the general applicability of this technique to glassy amorphous polymer thin film systems is investigated through systematic investigation of film thickness, glass transition temperature, and polymer mobility. The results reveal that the important parameters are the film thickness (coupled to the optical heating effects through anti-reflection coating effects) and the high-temperature polymer melt mobility, allowing for generation of single features with linewidths of down to ~1 μm. Further, the introduction of spatial mobility variations by using polymer brushes, bilayers, and microphase separated block copolymers leads to additional profile manipulation effects (i.e. spontaneous 2D pattern generation and flattened top profiles).Peer reviewe
On the Douglas-Rachford splitting method and the proximal point algorithm for maximal monotone operators
No full textCover title. "This paper consists mainly of dissertation research results of the first author."--Cover.Includes bibliographical references (p. 31-34).Research supported in part by the Army Research Office. DAAL03-86-K-0171 Research supported in part by the National Science Foundation. ECS-8519058by Jonathan Eckstein, Dimitri P. Bertsekas
Early Emissions Reduction Programs: An Application to CO2 Policy
No full textIn the wake of the December 1997 Kyoto Protocol, which, if implemented, would oblige the United States and other industrialized countries to reduce greenhouse gases (GHGs) by 2008–2012, a number of proposals have been offered to increase the incentives for reducing emissions over the nearer term. The existence of an interim period between setting and implementing environmental goals is ubiquitous in environmental policymaking. The existence of this interim period gives rise to several potential rationales for early emissions reductions. In this paper we use a series of simple models and numerical illustrations to analyze some aspects of the performance of early emissions reduction programs in the case of GHGs. We show that there is a compelling economic case for allowing early GHGs reduction credits if countries (not just individual firms) could bank early credits to offset future emissions. The annualized cost savings to the United States from spreading out abatement over time could easily amount to several billion dollars. But without the aggregate banking provision, such credits could easily generate an excessive amount of abatement and produce net economic losses. We analyze a number of other issues that affect the economic efficiency of early reduction credits, including asymmetric information, learning-by-doing (LBD), and fiscal impacts. We also compare the performance of an early reduction credits program with that of an early cap-and-trade program. This latter approach, if properly scaled, can avoid many of the problems associated with early reduction credits.
Determination of critical cooling rates in metallic glass forming alloy libraries through laser spike annealing
No full textThe glass forming ability (GFA) of metallic glasses (MGs) is quantified by the critical cooling rate (RC). Despite its key role in MG research, experimental challenges have limited measured RC to a minute fraction of known glass formers. We present a combinatorial approach to directly measure RC for large compositional ranges. This is realized through the use of compositionally-graded alloy libraries, which were photo-thermally heated by scanning laser spike annealing of an absorbing layer, then melted and cooled at various rates. Coupled with X-ray diffraction mapping, GFA is determined from direct RC measurements. We exemplify this technique for the Au-Cu-Si system, where we identify Au56Cu27Si17 as the alloy with the highest GFA. In general, this method enables measurements of RC over large compositional areas, which is powerful for materials discovery and, when correlating with chemistry and other properties, for a deeper understanding of MG formation.Peer reviewe
Multiscale Patterning of a Metallic Glass using Sacrificial Imprint Lithography
No full textBulk metallic glasses have been advanced as a means to achieve durable multiscale, nanotextured surfaces with desirable properties dictated by topography for a multitude of applications. One barrier to this achievement is the lack of a bridging technique between macroscale thermoplastic forming and nanoimprint lithography, which arises from the difficulty and cost of generating controlled nanostructures on complex geometries using conventional top-down approaches. This difficulty is compounded by the necessary destruction of any resulting reentrant structures during rigid demolding. We have developed a generalized method to overcome this limitation by sacrificial template imprinting using zinc oxide nanostructures. It is established that such structures can be grown inexpensively and quickly with tunable morphologies on a wide variety of substrates out of solution, which we exploit to generate the nanoscale portion of the multiscale pattern through this bottom-up approach. In this way, we achieve metallic structures that simultaneously demonstrate features from the macroscale down to the nanoscale, requiring only the top-down fabrication of macro/microstructured molds. Upon detachment of the formed part from the multiscale molds, the zinc oxide remains embedded in the surface and can be removed by etching in mild conditions to both regenerate the mold and render the surface of the bulk metallic glass nanoporous. The ability to pattern metallic surfaces in a single step on length scales from centimeters down to nanometers is a critical step toward fabricating devices with complex shapes that rely on multiscale topography for their intended functions, such as for biomedical and electrochemical applications.Peer reviewe
What does it mean to be alone?
No full textThis chapter discusses what it means to be ‘alone’ in particular ethnographic and historical contexts by considering the status of unmarried women. As countless instances in music, film and literature indicate, the spinster is often viewed as an icon of loneliness. Indeed, despite fairly high and consistent rates of non-marriage amongst both men and women, the never-married woman has long held a problematic status in much of Euro-American culture. The chapter is concerned only with women who have never been married, not with widows or the divorced who, in any case, are fairly thin on the ground in Catholic Flores. Perhaps the most crucial issue with regard to defining singlewomen is the age at which ‘spinsterhood’ can be said to be permanent. Unlike the more heavily-policed situation of unmarried women in some Muslim areas of Southeast Asia, singlewomen in Manggarai have a great deal of independence and freedom, a situation which only becomes easier as they age
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