In the educational context it is examined the teacher-stress association. The teacher’s stress is related with variables of academic environment, of out of the school and of the teacher. The impact of that association can be see in the teacher’s health, in his achievement and in the quality of the teaching-learning process. With the objective to present one view of how issue is being considered...

Noises with tonal components, howling sounds, and modulated signals are often the cause of customer complaints when emitted from technical products. The perception and evaluation of sound events containing such components has become increasingly important, e.g., in the field of vehicle acoustics for the assessment of tonality due to alternative drives. Furthermore, Information Technology (IT) d...

By lowering the transaction costs associated with barter, a payments system greatly facilitates the exchange of goods and services. Although vastly improved over the years, the process of transferring funds remains costly, and the evolution of the payments system has been at least partially determined by efforts to trim these costs further. Increasing the productivity of the payments system imp...

Agricultural needs in poor, tropical countries differ significantly from those in temperate, rich countries. Yet little agricultural research is performed on products for the tropics. Private sector research is particularly concentrated in rich countries. This is a result of significant failures in the market for R&D, in particular, the difficulty of preventing the resale of seed in developing ...

In the past all engineering students took a drafting class. This involved the use of T-squares, triangles, architectural scales, pounce, eraser shields, bow compasses, pencils, and patience. It gave students a sense of how drawings and diagrams are made and used. As new subjects have come into the curriculum most engineering programs have dropped the drafting requirement, or at least replaced i...

Based on a sample of about 600 state enterprises from 1980 to 1994, this paper investigates the productivity performance of SOEs using Data Envelopment Analysis and a Malmquist index. Our empirical results show that the average technical efficiency was low for these firms. Considerable productivity growth was found, but it was accomplished mainly through technical progress rather than through e...