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

Looking Beyond AFTA: Prospects and Challenges for Inter-regional Trade

The world-trading environment has witnessed the proliferation of regional trading arrangements during the last decade. This development has been accompanied by the perceived threat this may bring to the rules-based multilateral trading system. The Association of Southeast Nations (ASEAN), for its part, has not only reaffirmed its commitment to move forward beyond the ASEAN Free Trade Area (AFTA) and toward a higher level of economic integration, but is also looking at enhanced interaction and closer linkages with other regional groupings. This paper examines the prospects and challenges for expanding AFTA for inter-regional trade by first identifying the elements and principles that should govern such an expansion for it to contribute toward global liberalization. Areas for inter-regional linkages are also identified, highlighting the issues and conflicts that may arise considering the differing objectives and scope that AFTA has with the other trade blocs with which it may want to develop an inter-regional linkage. Some probable arrangements for linking/expanding AFTA with other groupings or non-ASEAN countries are then explored, particularly those involving the Australia-New Zealand Closer Economic Relation (CER), the East Asian Countries and the Andean Community.trade liberalization, trade reforms, trade sector, liberalization, ASEAN, trade policies, Andean Community

Review of Structural Adjustment in the Philippines

This article has been delivered during the Central Bank Diamond Jubilee celebration on November 21,1988. It reviews the issues of Philippine structural adjustments with a focus on the identification of elements in the past Philippine efforts that appear to be critical in the future adjustment endeavor. It also discusses the problems and the potentials of policy-based lending in support of future structural adjustment efforts in the Philippines.tax structure, agrarian reform, liberalization, structural adjustment, balance of payments, structural reforms, policy adjustment, industrialization

An Evaluation of the Home Consumption Value System

The Philippines has been one among the few that still adheres to the home consumption valuation (HCV), a system that, according to many importers, results to overvaluation. This article assesses the validity of the claim through analysis of HCV’s impact on the level of protection structure. It also estimates the revenue effects of a change in valuation basis.Bureau of Customs, trade sector, import commodities, consumption pattern, valuation system

Agricultural Biotechnology: Opportunities and Challenges for the Philippines

Developing countries, still heavily dependent on agriculture, must now harness biotechnology to modernize agricultural production and diversify product outputs. The Philippines was one of the first Asian countries to establish a biotechnology research and development program. However, not much progress in harnessing the tools of biotechnology has been achieved, especially in the area of varietal improvement. Despite an early realization of the importance of biotechnology in national agricultural development, there was little political will to provide resources for this program to move forward. Modern technology must be regarded as one of the tools in modernizing Philippine agriculture. Its role in varietal improvement, biosecurity, product standards and pest and disease prevention and management must be enhanced. A critical mass of highly trained human resources in the natural and social sciences that will undertake the research and development activities in agricultural technology must also be assured. Private participation must also be encouraged.biotechnology, agricultural technology, agriculture sector, agricultural productivity

International Debt of Developing Countries--Any Step Towards Solution?

This article is a brief review of the financial position of developing countries in the international market. It offers specific policy proposal concerning the macroeconomic management of LDCs.Less Developed Countries

Growth Models, Development Planning, and Implementation in the Philippines

Has Philippine development planning benefited from the wisdom, if any, of economic growth theory? In this article, the author discusses the key question of whether development planning in the Philippines has worked in delivering growth. He investigates the theoretical foundations of national development plans since independence in 1946 for indications and reflections of economic theories of growth prevailing at the time, the quality of the plans themselves and their impact.economic growth models, economic growth theory, development planning