A new three-dimensional heat flux-temperature integral relationship for half-space transient diffusion     

Jay I. Frankel  Majid Keyhani  Rao V. Arimilli 《Journal of The Franklin Institute》2010,347(9):1681-1688

This paper derives a new integral relationship between heat flux and temperature in a transient, three-dimensional heat conducting Cartesian half space (x>0, y∈(−∞,∞), z∈(−∞,∞)). A unified mathematical treatment has been developed based on operational and transform methods; and singular integral equation regularization. Regularization is accomplished based on a series of observations involving the diffusive nature of the operator. This newly developed relationship provides the local heat flux perpendicular to the front surface at any location within the half space. This expression suggests that an embedded plane of temperature sensors parallel to the surface can be used to acquire the local, in-depth heat flux in the x-direction. The relationship does not require a priori knowledge of the surface boundary condition which has analytically been removed in the process. The ill-posed nature of diffusion is highlighted owing to the appearance of the heating/cooling rate (°C/s) in the integrand of the new relationship. Integral relationships of this type are highly useful for experimental investigations since the in-depth heat flux can be extracted from well-established temperature transducers.  相似文献   

Predicting behavioral intention to use e-learning system: A case-study in Begum Rokeya University,Rangpur, Bangladesh     

Humida  Thasnim  Al Mamun  Md Habib  Keikhosrokiani  Pantea 《Education and Information Technologies》2022,27(2):2241-2265

Education and Information Technologies - Digital transformation and emerging technologies open a horizon to a new method of teaching and learning and revolutionizes the e-learning industry....  相似文献   

A Performance Approach to Job Analysis     

Al Folsom 《Performance Improvement Quarterly》2001,14(4):37-44

When we think of conducting analyses with a performance view, we commonly lean toward tools like front end analysis, needs assessment, performance analysis, and several variations. Usually, this starts because of a performance problem or because of an anticipated new performance. What about existing training? We look to training evaluation in its various levels to determine whether people like it, learn from it, transfer it, and whether the organization is benefiting from it. This paper describes a scenario where existing training was occurring, people suspected it could be more efficient, and yet the individuals' performance was for the most part satisfactory. We wanted to determine where the training could be made more efficient, determine if there were other barriers to performance, and do this with valid and reliable data from a large workforce. The Coast Guard's Performance Technology Center was in its infancy and was given the permission to try out alternative methods of conducting its work. This article describes the lessons learned about the process, about the technologies employed, and even the logistics of carrying out a rather large‐scale effort in minimal time.  相似文献