Award Data

LOW SPEED, TWO PHASE (VAPOR-LIQUID) FLOW REGIMES ARE IMPORTANT TO SEVERAL SIGNIFICANT HEAT TRANSFER PROBLEMS IN SPACECRAFT. LOW SPEED FLOW RATES ALSO CREATE THE MOST GRAVITY-AFFECTED FLOW REGIMES. HIGH SPEED FLOW RATES CREATE FLOW REGIMES THAT ARE AFFECTED LITTLE BY GRAVITY. FEW STUDIES EXIST WHICH GIVE AN OVERVIEW OF FLOW REGIMES IN ZERO GRAVITY. IN PARTICULAR, FEW STUDIES HAVE ATTEMPTED TO USE R ...

IN THE PROPOSED RESEARCH THE FEASABILITY WILL BE ESTABLISHEDFOR DEVELOPING A LOW-COST EXPENDABLE TRANSDUCER MOUNTED IN ANATIONAL WEATHER SERVICE TYPE RADIOSONDE TO MEASURE VERTICALPROFILES OF SUPERCOOLED LIQUID WATER. THE TRANSDUCER IS BASED UPON A WIRE WHOSE NATURAL VIBRATION FREQUENCY VARIES ACCORDING TO THE AMOUNT OF ICE COLLECTED ON THE WIRE. THE RESEARCH WILL EXAMINE THE EFFECTS ON THE THE RE ...

THE TASK GOAL IS TO IDENTIFY A COMPLETE SET OF OPERATING SYSTEM PRIMITIVE (OR LOW-LEVEL OPERATING SYSTEM FUNCTIONS) WHICH ARE SUFFICIENT TO SUPPORT REAL-TIME MULTI-TASKING APPLICATIONS, WHICH ARE COMPATIBLE WITH ADA PROGRAMMING ENVIRONMENTS, AND WHICH ARE AMENABLE TO EFFICIENT IMPLEMENTATIONS IN MICROCODE OR HARDWARE. TECHNIQUES TO EVALUATE THE FEASIBILITY OF SUCH IMPLEMENTATIONS IN VARIOUS ENVIRO ...

A CATHODE WILL BE DEVELOPED WHICH MINIMIZES THE HEATING POWER REQUIRED PER AMPERE OF ELECTRON GUN BEAM CURRENT, IS OF STUDY CONSTRUCTION TO WITHSTAND ROCKET FLIGHT, DOES NOT DETERIORATE DURING EXPOSURE TO ATMOSPHERIC GASSES WHILE COLD AND PRODUCES AT LEAST TENS OF AMPERES CURRENT. AN ELECTRON GUN WILL BE DESIGNED WHICH WILL BE CAPABLE OF TENS OF AMPERES BEAM CURRENT AT ENERGIES UP TO TENS OF KILOV ...

A FLIGHT MODULE WILL BE DESIGNED AND CONSTRUCTED THAT WILL LEAD TO THE CONSTUCTION OF AN ELECTRON GUN SUITABLE FOR ROCKET, SPACE SHUTTLE, AND SATELLITE FLIGHT. AN ELECTRON GUN MODULE WITH A WIDE DYNAMIC RANGE IN CURRENT. ENERGY, ANDDENSITY WILL BE CONDTRUCTED, CAPABLE OF AT LEAST 100 MILLI- AMPERES AND ABOVE 10 KILOVOLTS BEAM ENERGY. A CATHODE WILL BE DESIGNED TO MEET THE ABOVE SPECIFICATIONS AND ...

THERE ARE NUMEROUS APPLICATIONS WHERE THE THERMAL AND ELECTROMAGNETIC PERFORMANCE OF PURE METAL CONDUCTORS CAN BE APPRECIABLY ENHANCED BY COOLING WITH LIQUID HYDROGEN. ONE SUCH APPLICATION INVOLVES COOPER AND TUNGSTEN CONDUCTORS OF ELECTROMAGNETIC LAUNCH SYSTEMS COMMONLY KNOWN AS RAIL GUNS. THIS PROPOSAL ADDRESSES A NOVEL CONCEPT TO ENHANCE THE PERFORMANCE OF RAIL GUNS BY INCREASIG THEIR EFFICIENC ...

SHIPBOARD LIQUEFIERS IN USE BY THE NAVY FOR PRODUCING LIQUID OXYGEN AND LIQUID NITROGEN EMPLOY HIGH-SPEED TURBOEXPANDERS WITH OILLUBRICATED BEARINGS. MECHANICAL SHAFT SEALS WITH BUFFER GAS STAGES ARE USED IN THESE MACHINES TO PREVENT CONTAMINATION OF THE SYSTEM BY THE LUBRICANT. SUCCESSFUL CONTINUOUS OPERATION OF THE TURBOEXPANDERS,AND THE LIQUEFIER SYSTEM AS A WHOLE, DEPENDS UPON THE INTEGRITY OF ...

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