Extra-large crystal emulsion detectors for future large-scale experiments

Photographic emulsion is a particle tracking device which features the best spatial resolution among particle detectors. For certain applications, for example muon radiography, large-scale detectors are required. Therefore, a huge surface has to be analyzed by means of automated optical microscopes. An improvement of the readout speed is then a crucial point to make these applications possible and the availability of a new type of photographic emulsions featuring crystals of larger size is a way to pursue this program. This would allow a lower magnification for the microscopes, a consequent larger field of view resulting in a faster data analysis. In this framework, we developed new kinds of emulsion detectors with a crystal size of 600-1000 nm, namely 3-5 times larger than conventional ones, allowing a 25 times faster data readout. The new photographic emulsions have shown a sufficient sensitivity and a good signal to noise ratio. The proposed development opens the way to future large-scale applications of the technology, e.g. 3D imaging of glacier bedrocks or future neutrino experiments.Comment: Version accepted for publication in JINS

Private sector responses to public investments and policy reforms: The case of fertilizer and maize market development in Kenya

millions fed, food security, Fertilizer, maize, Liberalization market,

The Stairways to Heaven: A Model of Career Choice in Sports and Games, with an Application to Chess

We model individual careers in sports and games from initial entry to eventual exit or success as a discrete - choice, finite - horizon optimization problem. We apply this model to the international game of chess and study cross - country differences in the relative success of players. While we find no evidence that the players in our sample from the ex-Warsaw Pact are more talented than European and American players, there is evidence that they face lower training costs.occupational choice, sports and games

A new application of emulsions to measure the gravitational force on antihydrogen

We propose to build and operate a detector based on the emulsion film technology for the measurement of the gravitational acceleration on antimatter, to be performed by the AEgIS experiment (AD6) at CERN. The goal of AEgIS is to test the weak equivalence principle with a precision of 1% on the gravitational acceleration g by measuring the vertical position of the anni- hilation vertex of antihydrogen atoms after their free fall in a horizontal vacuum pipe. With the emulsion technology developed at the University of Bern we propose to improve the performance of AEgIS by exploiting the superior position resolution of emulsion films over other particle de- tectors. The idea is to use a new type of emulsion films, especially developed for applications in vacuum, to yield a spatial resolution of the order of one micron in the measurement of the sag of the antihydrogen atoms in the gravitational field. This is an order of magnitude better than what was planned in the original AEgIS proposal.Comment: 17 pages, 14 figure

How do high school graduates in Japan compete for regular, full time jobs? An empirical analysis based upon an internet survey of the youth

We use a survey of the Japanese youth within 10 year after high school graduation to investiage the impacts of the academic and social skills on their success in the job market. We find three major factors account for the job market outcome immediately after school: school characteristics and job placement services, academic performance, and social skills, including the negative impacts of problematic behaviors at the school. Second, when we run a Probit regression on whether or not the surveyed individuals hold regular, full time job, we find the persistent but declining (over age) im- pact of the job placement immediately after school. Moreover, we find the impact of variables pertaining to the sociall skills remain significant even after controling for the job placement outcome after school, whereas other variables such as GPA or attributes of highschools are largely irrelevant to the current employment status.

Mismeasurement of the CPI

In this paper, we investigate several key problems in Japanese economic statistics. We use CPI mismeasurements and biases as an example to explore the roots of the problems and also to offer guidelines for improvements. We emphasize 3 major shortcomings shared by many official statistics in Japan: (1) long delays in adjustments, (2) lack of proper coordination, and 3) insufficient information disclosure. In the analysis of CPI bias, we limit our focus to potential biases due to aggregation, survey methodology and sample selection procedures. We estimate that, in recent years, the commodity CPI inflation rate is biased upward by at least 0.5% per year, even if we assume away the potential bias associated with the quality adjustment, delay in incorporating changes in consumption basket, and other important unresolved problems.

Trends in Kenyan Agricultural Productivity: 1997-2007

Egerton University Tegemeo Institute of Agricultural Policy and DevelopmentAfrica, Kenya, productivity, Productivity Analysis, Q10,