Seismic characteristics of sediment drifts: An example from the Agulhas Plateau, southwest Indian Ocean

Sediment drifts provide information on the palaeoceanographic development of a region. Additionally, they may represent hydrocarbon reservoirs. Because of this, sediment drift investigation has increased over the last few years. Nevertheless, a number of problems remain regarding the processes controlling their shape, the characteristic lithological and seismic patterns and the diagnostic criteria.As an example, sediment drifts from the Agulhas Plateau, southwest Indian Ocean, are presented here. They show a variety of seismic features and facies including an asymmetric mounded geometry, changes in internal reflection pattern, truncation of internal reflectors at the seafloor and discontinuities. This collection of observations in combination with the local oceanography appears to comprise a diagnostic tool for sediment drifts

Long-time-tail Effects on Lyapunov Exponents of a Random, Two-dimensional Field-driven Lorentz Gas

We study the Lyapunov exponents for a moving, charged particle in a two-dimensional Lorentz gas with randomly placed, non-overlapping hard disk scatterers placed in a thermostatted electric field, $\vec{E}$. The low density values of the Lyapunov exponents have been calculated with the use of an extended Lorentz-Boltzmann equation. In this paper we develop a method to extend these results to higher density, using the BBGKY hierarchy equations and extending them to include the additional variables needed for calculation of Lyapunov exponents. We then consider the effects of correlated collision sequences, due to the so-called ring events, on the Lyapunov exponents. For small values of the applied electric field, the ring terms lead to non-analytic, field dependent, contributions to both the positive and negative Lyapunov exponents which are of the form ${\tilde{\epsilon}}^{2} \ln\tilde{\epsilon}$, where $\tilde{\epsilon}$ is a dimensionless parameter proportional to the strength of the applied field. We show that these non-analytic terms can be understood as resulting from the change in the collision frequency from its equilibrium value, due to the presence of the thermostatted field, and that the collision frequency also contains such non-analytic terms.Comment: 45 pages, 4 figures, to appear in J. Stat. Phy

Thermostating by deterministic scattering: the periodic Lorentz gas

We present a novel mechanism for thermalizing a system of particles in equilibrium and nonequilibrium situations, based on specifically modeling energy transfer at the boundaries via a microscopic collision process. We apply our method to the periodic Lorentz gas, where a point particle moves diffusively through an ensemble of hard disks arranged on a triangular lattice. First, collision rules are defined for this system in thermal equilibrium. They determine the velocity of the moving particle such that the system is deterministic, time reversible, and microcanonical. These collision rules can systematically be adapted to the case where one associates arbitrarily many degrees of freedom to the disk, which here acts as a boundary. Subsequently, the system is investigated in nonequilibrium situations by applying an external field. We show that in the limit where the disk is endowed by infinitely many degrees of freedom it acts as a thermal reservoir yielding a well-defined nonequilibrium steady state. The characteristic properties of this state, as obtained from computer simulations, are finally compared to the ones of the so-called Gaussian thermostated driven Lorentz gas.Comment: 13 pages (revtex) with 10 figures (encapsulated postscript

A Poet Builds a Nation: Hafez as a Catalyst in Emerson’s Process of Developing American Literature

Numerous studies have tried to elucidate the relationship between Emerson and Hafez. While most of these studies laid emphasis on influence of Hafez on Emerson and others on similarity and/or infatuation, they left untouched some vital historical aspects of this relationship. Taking into consideration the political and literary discourses of Emerson‘s America may illuminate the issue. America‘s attempt to gain independence from Britain, Emerson‘s resolution to establish an American literary tradition, his break with the European fathers to establish that identity, his open-mindedness in receiving non-European cultures and the correspondence between Emerson‘s transcendentalism and Hafez‘s mysticism led to Hafez‘s reception by Emerson

The changing role of cell culture in the generation of transgenic livestock

Transgenesis may allow the generation of farm animals with altered phenotype, animal models for research and animal bioreactors. Although such animals have been produced, the time and expense involved in generating transgenic livestock and then evaluating the transgene expression pattern is very restrictive. If questions about the ability and efficiency of expression could be asked solely in vitro rapid progress could be achieved. Unfortunately, experiments addressing transcriptional control in vitro have proved unreliable in their ability to indicate whether a transgene will be transcribed or not. However, initial studies suggest that cell culture may be able to predict in vivo post-transcriptional events. We review these issues and propose that strategies which engineer the transgene integration site could enhance the probability for efficient expression. This approach has now become feasible with the development of techniques allowing animals to be generated from somatic cells by nuclear transfer. The important step in this procedure is the use of cells grown in culture as the source of genetic information, allowing the selection of specific transgene integration events. This technology which has dramatically increased the potential use of transgenic livestock for both agricultural and biotechnological applications, is based on standard cell culture methodology. We are now at the start of a new era in large animal transgenics

An Asia-Pacific Model of Development Cooperation

Part One of the Osaka Action Agenda has clarified the implications of the basic political commitment to free and open trade and investment in the Bogor Declaration and has set out operational guiding principles and a well-developed strategy of implementation. This paper seeks to build on the broad concepts set in Part Two of Osaka Agenda to clarify the implications of the shared commitment of APEC leaders to development cooperation. From the concepts put forward by the APEC Eminent Person Group and the proposal of Partners for Progress, precise objective, guiding principles and priorities can be set out for the implementation of a realistic and balanced strategy for development cooperation.trade sector, investment, APEC

The Role of PIDS and Its Contribution to Research and Policymaking in the Philippines

Established in 1977, the Philippine Institute for Development Studies (PIDS) has been an important research resource in the country. It has served to bring together an unprecedented concentration of intellectual minds from institutions and organizations all over the country and abroad--to engage in an independent agenda that has generated a prolific body of work with a strong orientation and focus on policy. But how effective has this been? The author gives a brisk overview of why the wealth of insights and recommendations have not translated into enhanced developmental outcomes and laments that Philippine governments since at least Macapagal and Marcos have never built on each other--they "just selectively chose what they liked, not what the country needed."policy research, Philippine development

The Recent Recession and Rising Protectionism in Developed Countries: Some Thoughts on the ASEAN Economies

This paper has been presented at the Southeast Asia Program luncheon seminar in Cornell University, Ithaca, New York on April 11, 1985. Analysis suggests that bilateral trade grow rapidly during 1962-1981. To realize the country’s full potential, internal barriers and trade regime prove to be an important areas of concentration.trade sector, General Agreement on Tariff and Trade, ASEAN, recession, protectionism

China's WTO Entry: Effects on Its Economy and Implications for the Philippines

This paper investigates the implications of China’s accession to the World Trade Organization in December 2001 for the Philippines based on an analysis of Philippine-China bilateral trade structure, a presentation of the commitments made by China for its WTO accession, and a discussion of this significant event on China’s own economy. It points to finer applications of the theory of comparative advantage, e.g., identifying niche markets, building brand images, and engaging in strategic cooperation or competition with international partners, as the ways to survive in, if not profit from, the emerging world order.competitiveness, foreign direct investment, China, WTO entry, bilateral trade structure