Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 9 of 9 for “"R phase"”.
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An experimental investigation of the behavior of Nitinol
… material are determined. Phenomena such as the R-phase and stress induced martensite serration are investigated. A one-dimensional constitutive model is presented that quantitatively predicts stress-strain and shape memory effect behavior and was developed with the intention of being an …
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A Code Division Multiple Access Communication System for the Low Frequency Band
… CDMA schemes in that K users share a channel by phase modulating their transmissions with signature sequences. Our LF/CDMA scheme is different in that each user's signature sequence set consists of M orthogonal sequences and thus log(,2)M bits of information are transmitted by choosing among the …
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Transmission Electron Microscopy Studies In Shape Memory Alloys
… or stress between a cubic (B2) austenite phase and a monoclinic (B19') martensite phase. Ni-rich binary compositions are cubic at room temperature (requiring stress or cooling to transform to the monoclinic phase), while Ti-rich binary compositions are monoclinic at room temperature …
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Cryogenic Shape Memory Alloy Actuators For Spaceport Technologies: Materials Characterization And Prototype Testing
… change their shape by undergoing a solid-state phase transformation at a particular temperature. The shape change is associated with a large strain recovery as the material returns to its "remembered" shape. Their ability to act as both sensor and actuator has made them an attractive subject of …
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Synthesis and characterization of plasma enhanced chemically vapor deposited tantalum films
… detected by NRA. These studies indicated that a phase predominant Ta coatings with traces of oxygen, carbon, chlorine, and hydrogen were deposited by PECVD method. The coatings properties had been investigated in relation to deposition temperature, precursor temperature, RF input power, plasma …
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The characteristics of Titanium-nickel alloys produced by powder technology
… and the occurrence of a transient liquid phase during sintering above 955°C. Subsequent hot isostatic pressing of the sintered material allows densification to near full density.<br></br><br></br>The transformation temperatures and hardness of TiNi alloys containing excess amounts of …
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Design, Fabrication And Testing Of A Shape Memory Alloy Based Cryogenic Thermal Conduction Switch
… up to 8%) by undergoing a temperature-induced phase transformation. This strain recovery can occur against large forces, resulting in their use as actuators. The SMA elements in such actuators integrate both sensory and actuation functions. This is possible because SMAs can inherently sense a …
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Development of novel methodologies utilizing quaternary ammonium salts as catalysts
… this thesis (Chapter 3) details development of a phase transfer catalyzed [2,3]-sigmatropic rearrangement of allyloxy carbonyl compounds. Initial investigation focused on identifying viable substrate classes that would undergo selective [2,3]-rearrangement under phase transfer conditions. Under …
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Ring oscillator based injection locked clock multiplier
This thesis describes a ring-based injection locked clock multiplier (ILCM) designed with the goal of generating a high-frequency and low-jitter clock. Building on prior research done on injection locking, this design uses a reference frequency doubling technique to push the noise bandwidth of the …