Fused particle fabrication (FPF) (or fused granular fabrication (FGF)) has potential for increasing recycled polymers in 3-D printing. Here, the open source Gigabot X is used to develop a new method to optimize FPF/FGF for recycled materials. Virgin polylactic acid (PLA) pellets and prints were analyzed and were then compared to four recycled polymers including the two most popular printing materials (PLA and acrylonitrile butadiene styrene (ABS)) as well as the two most common waste plastics (polyethylene terephthalate (PET) and polypropylene (PP)). The size characteristics of the various materials were quantified using digital image processing. Then, power and nozzle velocity matrices were used to optimize the print speed, and a print test was used to maximize the output for a two-temperature stage extruder for a given polymer feedstock. ASTM type 4 tensile tests were used to determine the mechanical properties of each plastic when they were printed with a particle drive extruder system and were compared with filament printing. The results showed that the Gigabot X can print materials 6.5× to 13× faster than conventional printers depending on the material, with no significant reduction in the mechanical properties. It was concluded that the Gigabot X and similar FPF/FGF printers can utilize a wide range of recycled polymer materials with minimal post processing.
Fab labs, which offer small-scale distributed digital fabrication, are forming a Green Fab Lab Network, which embraces concepts of an open source symbiotic economy and circular economy patterns. With the use of industrial 3D printers capable of fused particle fabrication/ fused granular fabrication (FPF/FGF) printing directly from waste plastic streams, green fab labs could act as defacto recycling centers for converting waste plastics into valuable products for their communities. Clear financial drivers for this process have not been studied in the past. Thus, in this study the Gigabot X, an open source industrial 3D printer, which has been shown to be amenable to a wide array of recyclables for FPF/FGF 3D printing, is used to evaluate this economic potential. An economic life cycle analysis of the technology is completed comprised of three cases studies using FPF for large sporting equipment products. Sensitivities are run on the electricity costs for operation, materials costs from various feed stocks and the capacity factors of the 3D printers. The results showed that FPF/FGF 3D printing is capable of energy efficient production of a wide range of large high-value sporting goods products. In all cases, a substantial economic savings was observed when comparing the materials and energy related costs to commercial goods (even for customized goods). Using locally-sourced shredded plastic represented not only the best environmental option, but also the most economic. For the case study products analyzed even the lowest capacity factor (starting only one print per week) represented a profit when comparing to high-end value products. For some products the profit potential and return on investment was substantial (e.g. over 1000%) for high capacity use of a Gigabot X. The results clearly show that open source industrial FPF/FGF 3D printers have significant economic potential when used as a distributed recycling/manufacturing system using recyclable feed stocks in the green fab lab context.
Peace operations have gained international attention in recent years, and many excellent studies have appeared on the role of the military in separating warring factions, enforcing cease-fires, and providing humanitarian relief. Another dimension of peacekeeping has become readily apparent, however: the need to strengthen or rebuild indigenous public security institutions. Without a functioning police force, judiciary, and penal system, any troubled state is further hindered in its attempts to overcome internal crisis.The Institute for National Strategic Studies at the National Defense University has addressed this growing concern and concluded that rebuilding viable law enforcement capabilities is more central to the success of peace operations than generally appreciated. INSS assembled a core group of experienced civilian and military experts to prepare a series of case studies for discussion. The case studies then formed the basis for a conference held in late 1997 and attended by over one hundred international specialists. This book is the end result of that effort.Policing the New World Disorder should prove useful in conducting comparative analyses of operations involving international assistance to public security institutions. Chapters contributed by the Dutch, Swedish, Norwegian, Australian, and Austrian experts take a broad view of the subject. A final chapter offers some specific recommendations for consideration by the United Nations, the United States, and other governments in improving the conduct of multilateral operations to assist police forces, courts, and prison systems in troubled states. This effort has already contributed to an increased understanding of this dimension of peace operations among members of U.S. civilian and military agencies as well as international and nongovernmental organizations. This book provides new insights that should help those charged with carrying out such operations become more effective in strengthening public security institutions in troubled countries.
Conclusions• Barring a fundamental alteration in the character of the post-Cold War environment, the international community will continue to mount multinational peace operations in which ultimate success requires dealing effectively with the public security function.• While the fundamental lessons have been identified, the same deficiencies often persist, demonstrating that the lessons have not really been learned. Even when there is a major U.S. role, some missions are cobbled together, with military and Civ-Pol elements operating as discrete entities-with only limited coordinated action, a weak public security mandate and inadequate resources.• The UN has not been given adequate financial or managerial resources for Civ-Pol functions. It continues to suffer delays in recruiting Civ-Pol contingents, and many recruits arrive woefully lacking in essential basic skills and unsuited for coalition operations abroad. This often leaves military elements of the peace mission to confront a "public security gap" for which they are not properly prepared. The aversion to military-civilian police partnership further complicates effective overall operations.
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