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 20 of 1683 for “"cascade"”.
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Cascade
<p>Set in Colorado Springs, <em>Cascade</em> is a novel detailing the unraveling senses of belonging of its cast of characters. At the start of the novel Isa’s adoptive father, Ottis, leaves the city where they’ve built a life as a small, makeshift family. Isa and her mother Teresa, brother Zo, and …
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Bipolar cascade lasers
… issues of the design and modeling of the Bipolar Cascade Laser (BCL), a new type of quantum well laser. BCLs consist of multiple single stage lasers electrically coupled via tunnel junctions. The BCL ideally operates by having each injected electron participate in a recombination event in the …
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Terahertz quantum cascade lasers
… This thesis details the development of quantum cascade lasers (QCLs) that operate in the terahertz with photon energies below the semiconductor Reststrahlen band. Photons are emitted via electronic intersubband transitions that take place entirely within the conduction band, where the wavelength …
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Pose estimation using cascade trees
… and extended a face detector, based on cascades of boosted features, for use in real time systems. The extensions are twofold. First, I designed a way of combining several cascades into a cascade tree, and showed how such a tree provides a powerful mechanism for combining detector …
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Quantum Cascade Laser Frequency Combs
Quantum cascade lasers (QCLs) have been the dominant source of high-power infrared radiation ever since their invention in 1994. The ability to engineer their emission wavelengths from 3 𝜇m to 300 𝜇m has allowed scientists to use QCLs in a plethora of applications, ranging from spectroscopy to …
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Communication through channels in cascade
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1953.
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Cascade RLS with Subsection Adaptation
… speech coding purposes. We propose an RLS-based cascade adaptive filter structure that can significantly reduce the computational effort required by the RLS algorithm for inverse filtering types of applications. We named it the Cascade RLS with Subsection Adaptation (CRLS-SA) algorithm. The …
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Steady and unsteady cascade measurements
… measurements were made in a linear stationary cascade of compressor blades under high angles of attack. Laser-doppler velocimetry and flow visualization were used. A method was developed for inducing propagating stall and some triggered ensemble averaged velocity records were obtained. An …
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Cascade Approaches to Polycyclic Natural Products
… the studies detailed herein have employed cascade-based strategies to access the rigid, strained cores contained within all selected targets. The ability of cascade chemistry to rapidly form high levels of molecular complexity and introduce elements of considerable difficulty, such as rigid …
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The transistor-injected quantum cascade laser
Since its invention in 1994 the quantum cascade laser has become the most important coherent emission source for mid-infrared and terahertz ranges. The quantum cascade laser is a unipolar semiconductor laser that utilizes electron transitions between quantized states in the conduction band for …
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Electrically tunable terahertz quantum cascade lasers
… assisted electrically tunable terahertz quantum cascade lasers (THz QCLs) are designed and demonstrated. Two MEMS tuner devices are proposed to achieve electrically tunable THz QCLs. One is the electrostatic comb drive actuated tuner design and the other one is a two-stage flexure design that is …
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Design of a cascade test rig
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1947.
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Development of terahertz quantum-cascade lasers
… development of mid-infrared ( ... ) quantum-cascade lasers (QCLs) in the past decade, this thesis describes the development of electrically-pumped terahertz quantum-cascade lasers in GaAs/AlsGal_.As heterostructures that span a spectral range of 1.59 - 5.0 THz ( ... ). A quantum-cascade laser …
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Temporal Dynamics of the Defense Cascade
… for phobias, anxieties, and PTSD. The defense cascade is reviewed as a theoretical model that predicts behavioral and physiological responses to threats. Nineteen undergraduates (five male), average age 19.4 experienced a novel virtual reality (VR) threat scenario while their physiology was …
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Trace gas spectrometry using quantum cascade lasers
… swept laser. A bench mounted two channel quantum cascade laser absorption spectrometer was used during experiments to observe and reduce nonlinear effects that arise from tuning the lasers during the absorption of light by several atmospherically important gases. These gases include the oxides of …
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