An alternative method for the measurement of the mechanical impulse of a vertically directed blast.
An alternative method for the measurement of the total mechanical impulse of a vertically directed blast due to an explosive charge is presented. The method differs from apparatus that employ a vertically displaced mass (similar in principle to the ballistic pendulum) in that a relatively compact spring-damper system is employed to constrain the movement of the mass. The mechanical impulse is determined by integrating, with respect to time, the net force applied to the spring-damper system. The details of an explosive impulse measuring instrument rated to 12 kN s are presented.
The influence of the height of burial of buried charges – Some experimental observations
Abstract This paper presents the results of an experimental investigation to determine the effect of the height of burial (the amount of sand beneath the buried charge) on a buried charge in terms of impulses imparted onto a rigid steel target plate (suspended from a vertical pendulum). The 40 mm rigid target plate of exposed area 400 mm × 400 mm is located at a constant stand-off distance of 47 mm above the surface of the sand. Tests conducted at a height of burial of 0 mm (placed flush on a steel base plate) resulted in the largest impulse transfer for all depth of burial (amount of sand above the buried charge) values tested. The optimal depth of burial for impulse transfer was observed to occur within 50–70 mm irrespective of the height of burial (0–110 mm). Semi-infinite height of burial conditions are attained when any further increase in the height of burial does not influence the impulse transfer to the target plate. The height of burial representing semi-infinite conditions observed in the experiments is a function of the depth of burial.
La participacion de los stakeholders en las iniciativas de branding del hospital en las redes sociales: una propuesta de modelo para construir marcas colectivas
Introduction : All health organizations face many managerial and economic challenges such as the consolidation of private and international hospitals, the increasingly interest of society for health education issues or the development of telemedicine. In this framework, many organizations prioritize social media as the main corporate communication tool for building a reputed brand in a collective way along with stakeholders. Objectives : This paper aims to identify a communication model allowing hospitals to efficiently apply branding initiatives on social media in order to build a brand in a collective way with stakeholders. Methodology : We carried out a literature review about corporate communication, health communication, branding and social media; and, then, we proposed the PET Model for Branding Hospitals on Social Media. Results and Conclusion : We conclude that hospitals should create a multidisciplinar corporate communication department, implement management initiatives for allowing health professionals have more time for using social media and integrate health education and patient’s empowerment in every communication initiative.