Estimating Pure Diffusion Contributions in Alkaline Pulping Processes

A model that predicts isothermal alkali diffusion and reaction with acetyl groups in moist wood chips was derived and approximated. System parameters were estimated from unsteady-state experimental data. Simulation results reinforce the idea that the diffusion effect is not fully exploited in pulping processes. Traditionally, digestion is conducted at high temperature, where delignification reaction kinetics is enhanced and the reaction effect is predominant. This approach is being reviewed by modern industry since energy and environmental savings associated with low temperature operation might compensate for high-yield productivity. The concentration of alkali at the center of the chip is a measure of the completeness of wood deacetylation, which translates into the aptitude of the final product for pulping purposes. This concentration is predicted here from the solution to a pair of coupled ODE’s. Since alternatives combining both low and high-temperature processes are being studied, the results in this paper provide basic data for optimization analysis.Fil: Costanza, Vicente. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; ArgentinaFil: Costanza, Pedro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; Argentin

Do Migrants Improve Governance at Home? Evidence from a Voting Experiment

This paper tests the hypothesis that international migration experiences may promote better institutions at home by raising the demand for political accountability. In order to examine this question, we use a simple postcard voting experiment designed to capture the population’s desire for better governance. Using data from a tailored household survey, we examine the determinants of voting behavior in our experiment, and isolate the positive effect of international emigration on the demand for political accountability. We find that this effect can be mainly attributed to the presence of return migrants, particularly to those who emigrated to countries with better governance.international migration, governance, political accountability, institutions, effects of emigration in origin countries, household survey, Cape Verde, sub-Saharan Africa

Do Migrants Improve Governance at Home? Evidence from a Voting Experiment

Can international migration promote better institutions at home by raising the demand for political accountability? In order to examine this question, we designed a behavioral measure of the population's desire for better governance. A postcard was distributed to households with the pledge that, if enough postcards were mailed back, results from a survey module on perceived corruption would be made public in the national media. Using data from a tailored household survey, we examine the determinants of our behavioral measure of demand for political accountability (i.e. of undertaking the costly action of mailing the postcard), and isolate the positive effect of international emigration using locality level variation. The estimated effects are robust to the use of instrumental variables, including both past migration and macro shocks in the migrant destination countries. We find that the estimated effects can be mainly attributed to those who emigrated to countries with better governance, especially return migrants.international migration, governance, political accountability, institutions, effects of emigration in origin countries, household survey, Cape Verde, sub-Saharan Africa.

Do Migrants Improve Governance at Home? Evidence from a Voting Experiment

This paper tests the hypothesis that international migration experiences may promote better institutions at home by raising the demand for political accountability. In order to examine this question, we use a simple postcard voting experiment designed to capture the population’s desire for better governance. Using data from a tailored household survey, we examine the determinants of voting behavior in our experiment, and isolate the positive effect of international emigration on the demand for political accountability. We find that this effect can be mainly attributed to the presence of return migrants, particularly to those who emigrated to countries with better governance.international migration, household survey, governance, political accountability, institutions, effects of emigration in origin countries, Cape Verde, Sub-Saharan Africa

Legal Corruption

We challenge the conventional definition of corruption as the abuse of public office for private gain, making a distinction between legal and illegal forms of corruption, and paying more attention to corporate patterns of corruption (which also affect public corruption). We undertake to identify general determinants of the pattern of legal and illegal corruption worldwide, and present a model where both corruption (modeled explicitly in the context of allocations) and the political equilibrium are endogenous. Three types of equilibrium outcomes are identified as a function of basic parameters, namely initial conditions (assets/productivity), equality, and fundamental political accountability. These equilibria are: i) an illegal corruption equilibrium, where the political elite does not face binding incentives; ii) a legal corruption equilibrium, where the political elite is obliged to incur on a cost to deceive the population; and iii) a no-corruption equilibrium, where the population cannot be deceived. An integral empirical test of the model is performed, using a broad range of variables and sources. Its core variables, namely regarding legal corruption (and other manifestations of corporate corruption) come from an original survey developed with the World Economic Forum (in the Executive Opinion Survey 2004 of the Global Competitiveness Report). The empirical results generally validate the model and explanations. Some salient implications emerge.

Votes and Violence: Evidence from a Field Experiment in Nigeria

Following the wave of democratization during the 1990s, elections are now common in low-income societies. However, these elections are frequently flawed. We investigate the Nigerian general election of 2007, which is to date the largest election held in Africa and one seriously marred by violence. We designed and conducted a nationwide field experiment based on randomized anti-violence grassroots campaigning. We find direct effects on violence outcomes from exploring both subject-surveying and independent data sources. Crucially, we establish that voter intimidation is effective in reducing voter turnout, and that the violence was systematically dissociated from incumbents. We suggest that incumbents have a comparative advantage in alternative strategies, vote buying and ballot fraud. Voter intimidation may be a strategy of the weak analogous to terrorism.Violence, Conflict, Electoral Politics, Political Economy, Randomized Experiment, Field Experiment, Nigeria, West Africa

Testing the 'Brain Gain' Hypothesis: Micro Evidence from Cape Verde

Does emigration really drain human capital accumulation in origin countries? This paper explores a unique household survey purposely designed and conducted to answer this research question. We analyze the case of Cape Verde, a country with allegedly the highest 'brain drain' in Africa, despite a marked record of income and human capital growth in recent decades. Our micro data enables us to propose the first explicit test of 'brain gain' arguments according to which the prospects of own future migration can positively impact educational attainment. According to our results, a 10pp increase in the probability of own future migration may improve the average probability of completing intermediate secondary schooling by 8pp for individuals who do not migrate before age 16. Strikingly, this same 10pp increase may raise the probability of completing intermediate secondary schooling by 11pp for an individual whose parents were both non migrants when the educational decision was made. Our findings are robust to the choice of instruments and econometric model. Overall, we find that there may be substantial human capital gains from lowering migration barriers.household survey, Cape Verde, brain drain, brain gain, international migration, human capital, effects of emigration in origin countries, sub-Saharan Africa