Educating Future Environmental Health Professionals

Future environmental health problems will require a new generation of educated and trained professionals. Efforts to enhance the environmental public health workforce have been promoted by several organizations. While progress has been measured by these organizations, many environmental health academic programs are experiencing budget reductions and lower enrollments. One of the reasons for this trend is the so-called higher education crisis. We argue that training is not equivalent to education in the environmental health sciences, albeit the two terms are often used interchangeably. Organizations involved with the education, training, and credentialing of environmental health professionals must work together to ensure the viability and effectiveness of environmental health academic programs

Extending the nomological network of wellness at work

Modern-day organisations face rapid and continuous change. In order to deal with this rapidly changing and current hostile economic environment, most organisations have become increasingly dependent on a healthy and engaged workforce. As a result of the direct and indirect organisational costs associated with work wellness, the total well-being of the individual worker has become the focal point of many organisational interventions. Although work wellness is a multifaceted and continuously evolving concept, most studies have adopted either a pathological or a salutogenic (positive) perspective when examining the construct. Congruent with current thinking in vocational psychology, a balanced model of work wellness was conceptualised in this study, containing both salutogenic (work engagement) and pathological (burnout) constructs. Strong empirical support was found for the proposed balanced model of work wellness based on data collected from a sample of 854 employees working across various sectors of the South African economy.DHE

Thixotropy in macroscopic suspensions of spheres

An experimental study of the viscosity of a macroscopic suspension, i.e. a suspension for which Brownian motion can be neglected, under steady shear is presented. The suspension is prepared with a high packing fraction and is density-matched in a Newtonian carrier fluid. The viscosity of the suspension depends on the shear rate and the time of shearing. It is shown for the first time that a macroscopic suspension shows thixotropic viscosity, i.e. shear-thinning with a long relaxation time as a unique function of shear. The relaxation times show a systematic decrease with increasing shear rate. These relaxation times are larger when decreasing the shear rates, compared to those observed after increasing the shear. The time scales involved are about 10000 times larger than the viscous time scale and about 1000 times smaller than the thermodynamic time scale. The structure of the suspension at the outer cylinder of a viscometer is monitored with a camera, showing the formation of a hexagonal structure. The temporal decrease of the viscosity under shear coincides with the formation of this hexagonal pattern