Non-Isotropic Angular Distribution for Very Short-Time Gamma-Ray Bursts

While most gamma-ray bursts (GRBs) are now believed to be from cosmological distances, the origin of very short-time GRBs is still not known. In the past, we have shown that GRBs with time duration (T90) less than 100 ms may form a separate class of GRBs based on the hardness and time distribution of these events. We have also shown that the ln N ln S distribution is consistent with the expectation of quasi-Euclidean distribution of sources. In this paper, we report the study of the angular location of these GRBs showing a strong deviation from isotropy within the Galactic coordinates of plus 180 degrees < longitude < 90 degrees and -30 degrees < latitude < 30 degrees. We have studied the rest of the GRBs and do not find a similar deviation. This further indicates that the very-short GRBs likely form a separate class of GRBs, most probably from sources of Galactic or near solar origin

Groundnut Trade Liberalization: Could the South Help the South?

This paper analyzes policies affecting global groundnut-products markets. The new US groundnut policy is now a minor source of distortion in world markets where India and China stand out as the major distorters. We analyze and quantify the effects of groundnut-products trade liberalization on consumer welfare and producer income. Our analysis shows that African exporters would gain significantly from reductions in protection and subsidies in India, and to a lesser extent, China, although Chinaï¾’s exports of food-quality groundnuts would expand dramatically. Net-importing OECD countries would suffer from higher world prices. The paper draws direct implications for the Doha trade negotiations.

THE IMPACT OF GROUNDNUT TRADE LIBERALIZATION: IMPLICATION FOR THE DOHA ROUND

We use a partial-equilibrium multi-market international model to analyze trade and agricultural policies affecting peanut/groundnut products markets. The model covers four goods (food and crush quality groundnuts, groundnut oil and cake) in 13 countries/regions including a large set of developing countries (Argentina, China, the Gambia, India, Malawi, Mexico, Nigeria, Senegal, and South Africa). Welfare is evaluated by looking at the consumer's equivalent variation, quasi-profits in farming (groundnut farming, livestock), quasi-profit in crushing, and taxpayers' revenues and outlays implied by distortions. We calibrate the model on recent historical data. We analyze several groundnut trade liberalization scenarios. The impact of the reforms is measured in deviation from the recent historical baseline. Trade liberalization in groundnut markets has a strong South-South dimension opposing two large developing countries (India and China) to smaller developing countries mainly located in Africa. Current Chinese and Indian policies substantially depress the world prices of edible groundnuts, groundnut oil and groundnut meal. Following the removal of these distortions, African exporters present in these world markets would gain because they are net sellers of the cash crops. Consumers in China and India would be better off as well with lower consumer prices resulting from the removal of high tariffs more than offsetting the higher world prices of groundnut oil. The cost of adjustment would fall on farmers in India and China who would have to shift to other crops or activities. Crushing in India would also decrease because crushing margins would deteriorate. Net buyers of groundnut products in OECD countries will be worse off. We draw implications for Doha negotiations.International Relations/Trade,

On the origin of bimodal duration distribution of Gamma Ray Bursts

The modified version of a bullet model for gamma ray bursts is studied. The central engine of the source produces multiple sub-jets that are contained within a cone. The emission of photons in the source frame of a sub-jet either takes part in an infinitesimally thin shell, or during its expansion for a finite time. The analysis of the observed profiles of GRBs taken by BATSE leads us to the conclusion that the latter possibility is much more favored. We also study the statistical distribution of GRBs, in the context of their bimodality of durations, taking into account the detector's capability of observing the signal above a certain flux limit. The model with shells emitting for a finite time is able to reproduce only one class of bursts, short or long, depending on the adopted physical parameters. Therefore we suggest that the GRB bimodality is intrinsically connected with two separate classes of sources.Comment: 12 pages, 12 figures; accepted by MNRAS. Small changes to match the corre cted proof

AGRICULTURAL MARKETS LIBERALIZATION AND THE DOHA ROUND

Using a partial equilibrium model of world agriculture, we investigate the multilateral removal of all border taxes and farm programs and their distortion of world agricultural markets. These distortions have significant terms-of-trade effects. World trade is also significantly impacted by both types of distortions. Trade expansion is substantial for most commodities, especially dairy, meats, and vegetable oils. Net agricultural and food exporters (Brazil, Australia, and Argentina) emerge with expanded exports; whereas net importing countries with limited distortions before liberalization are penalized by higher world markets prices and reduced imports. The US gains significant export shares in livestock products and imports more dairy products. Without protection and domestic subsidies, the EU loses many of its livestock and dairy export markets.Doha, Agriculture, trade liberalization, domestic policy, International Relations/Trade,

Events in the affective city: Affect, attention and alignment in two ordinary urban events

In a representational regime, planned urban events are used by urban planners to render urban projects visible and acceptable. As a corollary of the focus of urban studies on their representational dimension and in spite of a burgeoning literature on the notion of affective urbanism, the experiential character of events remains surprisingly unexplored. This paper argues that an ordinary regime of events is mobilised by city-makers to act on the embodied, affective experience of the city and on the ways urban dwellers know and act upon the city. By analysing planned urban events in their embodied, experiential dimension, we focus on the ways in which, through the design of ephemeral material dispositives, urbanists attempt to encourage citizens to incorporate ways of knowing and acting on space and on the modalities of knowing and acting that are at play. We stage an encounter between critical event studies and Ingoldian approaches to affect and attention, examining two urban events in a Swiss canton. We show how intense encounters with urban matter are staged in an attempt to modulate affects, guide attention, and produce alignment with a specific political project, asking urban dwellers either to embody a project still in the making or to cultivate expectations regarding an already-written future