Theory on the Meshing of Skew Bevel Gears

By the aid of line geometry based on the Study\u27s coordinate of a straight line and also by the aid of the vectorial coordinates of a generating plane or a generating rigid surface, were obtained fundamental mathematical expressions denoting the condition for the meshing of skew bevel gears. Making use of these expressions we can treat the affairs concerning the meshing of skew bevel gears. By way of example two theorems were derived from these fundamental mathematical expressions

De Capa a Spielberg: uma estética para a representação da guerra

Este artigo aborda a utilização das fotografias de Robert Capa como fonte para acriação de cenas do filme “O resgate do soldado Ryan” de Steven Spielberg, produzido em 1998. Robert Capa acompanhou o desembarque das primeiras tropas aliadas no litoral da Normandia, no dia 6 de junho de 1944, o dia D. A pesquisa indica que as cenas do filme buscam, através de técnicas cinematográficas, reproduzir a estética das imagens de Capa, fazendo com que o espectador se sinta, assim como o fotógrafo, dentro do campo de batalha.http://dx.doi.org/10.5902/217549771069

Intelligent Method for Diagnosing Structural Faults of Rotating Machinery Using Ant Colony Optimization

Structural faults, such as unbalance, misalignment and looseness, etc., often occur in the shafts of rotating machinery. These faults may cause serious machine accidents and lead to great production losses. This paper proposes an intelligent method for diagnosing structural faults of rotating machinery using ant colony optimization (ACO) and relative ratio symptom parameters (RRSPs) in order to detect faults and distinguish fault types at an early stage. New symptom parameters called “relative ratio symptom parameters” are defined for reflecting the features of vibration signals measured in each state. Synthetic detection index (SDI) using statistical theory has also been defined to evaluate the applicability of the RRSPs. The SDI can be used to indicate the fitness of a RRSP for ACO. Lastly, this paper also compares the proposed method with the conventional neural networks (NN) method. Practical examples of fault diagnosis for a centrifugal fan are provided to verify the effectiveness of the proposed method. The verification results show that the structural faults often occurring in the centrifugal fan, such as unbalance, misalignment and looseness states are effectively identified by the proposed method, while these faults are difficult to detect using conventional neural networks

A Comparative Study on the Evaluation of Educational Materials for Appropriate Stoma Care Appliance Selection Based on Patient Conditions

Division of Nursing, University Hospital, Kyoto Prefectural University of MedicineSchool of Nursing, Kyoto Prefectural University of MedicineBackgroundPoor stoma management can reduce a patient’s quality of life. Therefore, nurses should have the knowledge on how to provide appropriate stoma care.AimsWe aimed to evaluate educational materials developed based on the results of a survey conducted among nurses.MethodsFirst, a first survey was conducted among 12 nurses to analyze their knowledge on stoma care. Next, a workshop using educational materials developed based on the results of the first survey was conducted. Subsequently, a second survey was performed after six months to evaluate the effectiveness of these educational materials.FindingsThe results of the first survey showed the areas where nurses lacked knowledge. Meanwhile, the results of the second survey demonstrated that images and photographs enhanced the learning effect of these educational materials.ConclusionThe use of educational materials developed based on survey results and provision of learning opportunities improved nurses’ stoma care knowledge