Questões Militares

Texto 1

                  LANDFILLS AND THE INTRODUCTION OF NANOMATERIALS IN WASTE

      Waste disposal on land (dumping) and landfilling remain the most prominent waste management techniques used ______. The standards and practices for this type of waste disposal vary greatly ranging from uncontrolled sites to highly specialised and controlled engineered landfills. The potential ______ of contaminants through landfill gas and leachate is largely dependent on landfill design, site conditions and the sophistication of the control measures in place, ______ landfill gas recovery and leachate collection and treatment systems.

Modern engineered landfills use ______ barriers, with few relying on natural barriers, to line the bottom of a landfill and incorporate collection systems for both leachate and landfill gas. The purpose of these collection systems is to capture and treat leachate and landfill gas; ______ preventing the migration of leachate into ground/surface water and the release of untreated landfill gases to the atmosphere. An un-engineered landfill would be considered an uncontrolled system due to the lack of environmental controls, potentially resulting in significant environmental exposure of contaminants.

      Because of widespread use of ENMs in a broad range of products, it is possible that some ENMs ______ through landfill gases; however this report will primarily focus on ENMs that may be present in landfill leachate, as this is considered to be the primary means by which ENMs could be transported______ a landfill. Characterisation of landfill gases to identify the presence of ENMs ______ an important area for further research.

      Landfill leachate is generated when rain passes through the waste mass and by the liquid generated due to the breakdown of waste ______ the landfill. The composition of leachate is extremely ______ depending on the type of waste landfilled, the quantity of precipitation, the construction and operation of the landfill, the age of the landfill and other factors such as pH, temperature and microbial populations.

                                                                              (…)

ENMs = engineered nanomaterials.

Organisation for Economic Co-operation and Development. Landfills and the introduction of nanomaterials in waste. In: Landfilling of waste containing nanomaterials and nanowaste, 2015. Disponível em: . Acesso em: 22/04/2015. 

            Operation Desert Storm Was Not Won By Smart Weaponry Alone

      Technology has long been a deciding factor on the battlefield, from powerful artillery to new weaponry to innovations in the seas and the skies. Twenty-five years ago, it was no different, as the United States and its allies proved overwhelmingly successful in the Persian Gulf War. A coalition of U.S. Army Apache attack helicopters, cruise missiles from naval vessels, and Lockheed F-117 Nighthawk “stealth fighters” soundly broke through Saddam Hussein’s army defenses in Kuwait during Operation Desert Storm, which became known as the “100-hour war”.

      But for all the possibilities that this “Computer War” offered, Operation Desert Storm was not won by smart weaponry, alone. Despite the “science fiction”-like technology deployed, 90 percent of the pieces of ammunition used in Desert Storm were actually “dumb weapons”. The bombs, which weren’t guided by lasers or satellites, were lucky to get within half a kilometer of their targets after they were dumped from planes. While dumb bombs might not have been exciting enough to make the headlines during the attack, they were cheaper to produce and could be counted on to work. But frequency of use doesn’t change why history will remember Desert Storm for its smart weapons, rather than its dumb ones.

Adapted from http://www.smithsonianmag.com/history/ operation-desert-storm-was-not-won-smart-weaponry-alone- 180957879/