Grain Relativity Humidity Real-Time Prediction Based on Different Saturated Humidity Models in the Process of Storage
A mathematical model was selected and established based on the granary internal temperature and humidity real-time monitoring. In the experiment, the relative humidity of different water content corns were predicted by using different saturated vapor pressure formula and select the fittest model by comparing with the calculations and the test results. The humidity calculated by the saturated vapor pressure at formula 3 was closest to the actual measurement in them. Using the model it was possible to predict the evolution of grain relativity humility. During the experiment process, the calculation appeared the fluctuation because the internal humidity of grain was greatly influenced by the temperature and relativity humidity of the environment.
Determination of Grain Stack's Equilibrium Absolute Humidity and Dewpoint Tempertaure
A moisture sorption equation named CAE was adopted to fit the EMC/ERH data of wheat,paddy and shelled corn,and the parameter-known CAE used for making curve graphs of equilibrium absolute humidity and equilibrium relative humidity of each grain species.The value of grain equilibrium absolute humidity was better for aeration decision than that of grain equilibrium relative humidity.Referring to atmosphere absolute humidity and dewpoint temperature,one can quickly make a decision on grain stack's aeration after checking the grain equilibrium absolute humidity and dewpoint temperature.
Expansion without equity: An analysis of current policy on access to higher education in Brazil
Access to higher education in Brazil is to a large extent restricted to the higher socio-economic groups. Public universities have limited places and entry is determined by highly competitive exams, thereby excluding those who have not had a high quality secondary education or attended an expensive preparatory course. There has been considerable growth in the private sector to absorb the excess demand, but the majority of Brazilians cannot afford the fees. This paper develops a concept of equity in higher education in which, firstly, there should be sufficient places in the system as a whole and, secondly, all people should have a fair opportunity of attending the university of their choice regardless of socio-economic background. Recent efforts to expand access are analysed, including incentives for the growth of private universities, student loans and the new Prouni initiative, in which private institutions provide free places to low-income students in return for tax exemptions. While these initiatives have the potential to increase the total number of places, they will not lead to an equitable expansion, as disadvantaged students will still be confined to courses of lower quality or with lower subsequent value on the employment market. Initiatives aimed at the public sector such as the introduction of quotas and changes to entry examinations are also discussed. Finally, some implications for future policy development are outlined.