Concurrent Technologies Corporation is an American nonprofit organization that performs scientific research and development. CTC operates a number of Department of Defense programs such as the National Defense Center for Environmental Excellence and the Navy Metalworking Center .On November 4, 2007, the New York Times reported Concurrent Technologies Corporation had received $226 million in Congressional earmarks since 2004. Wikipedia.
Nastac L.,Concurrent Technologies Corporation
ISIJ International | Year: 2010
Minimizing macro-segregation during static casting of segregation prone alloys has always been a challenge. Over the years, alloy manufacturers have optimized the processing techniques for these alloys by balancing the total heat input of a casting and the rate of heat extraction from the casting surface. In this study, a computational fluid dynamics (CFD) code was used to develop a generic framework for studying macrosegregation and shrinkage in various casting processes. The code developed the framework by solving for the solid fraction evolution, micro-scale characteristics, temperature, flow and solute balance in multi-component alloy systems. Experiments were previously designed to measure solidification parameters using micro-probe compositional analysis. The thermo-physical properties of alloy 718 that were used in the simulations strongly depend on temperature. The partition coefficients of Nb, Ti, Al, and Mo in alloy 718 are also a strong function of temperature. They were determined based on quenching experiments during solidification of alloy 718. The model predictions were validated against measured macro-shrinkage and shrinkage porosities and against macro-segregation measured from pieces cut from both laboratory scale and industrials scale castings. A special segregation index was developed and then applied to properly assess the influence of material and process parameters on macro-segregation. The effect of Nb content and processing parameters such as super-heat, mold taper, mold type, and mold diameter on macro-segregation was also studied. Additional validation of the segregation model was performed using the literature analytical solution and experiments. Additional experimental validation of the model for prediction of macro-shrinkage and shrinkage porosities was performed using A356 plates cast in furan-silica sand molds. © 2010 ISIJ. Source
Concurrent Technologies Corporation | Date: 2015-07-10
A self-sealing flow frame is provided having a first frame component and a second frame component. Each frame component is provided with a tongue-and-groove configuration that when assembled forms a tessellation engagement, which creates the seal. When each frame component is assembled into a flow frame, with the inner surfaces facing towards each other, the tongue-and-groove arrangements create a seal profile that circumscribe constituent parts of a device within which the self-sealing flow frame is being employed. As the frame components are compressively secured and fastened together, a tessellation engagement of the seal profile forms the fluid seal. Fluids of the device are prevented from exfiltrating the device, and are contained within the self-sealing flow frame by the fluid seal.
Concurrent Technologies Corporation | Date: 2014-03-13
A system for converting a waste stream to energy including a water purification device that outputs purified water and a waste stream that includes an electrolyte, a wind and electrolytic energy generation device that receives the waste stream from the water purification device and outputs energy based on the electrolyte present in the waste stream and a power distribution system which receives and stores the energy from the wind and electrolytic energy generation device. The water purification device is further connected to the power distribution system and receives energy enabling further operation of the water purification device.
Concurrent Technologies Corporation | Date: 2012-03-09
Aluminum-magnesium alloys are ideal for ship construction; however, these alloys can become sensitized and susceptible to intergranular corrosion when exposed to moderately elevated temperatures. A stabilization treatment has been developed to reverse sensitization and restore corrosion resistance, such that in-service plate can be refurbished rather than replaced. This treatment involves a short exposure to a specific elevated temperature range and can be implemented with portable units onboard a ship.
Concurrent Technologies Corporation | Date: 2015-02-06
A self contained energy generating system that comprises a galvanic battery and a power distribution system. The energy generating system is used to purify water by using a reverse osmosis device that draws in a source of water and transfers electrolytes to the galvanic battery. Upon contact with the electrolyte, the galvanic battery produces energy by an oxidation-reduction reaction of the cathode and anode and transfers energy to the power distribution system, which in turn provides power to the osmosis device. Additionally, the system includes a hydrogen fuel cell to increase the amount of energy generated and a power storage device for storing excess energy generated. The system also includes a controller which is configured to regulate the overall operation of the system.