Comparative analysis of analog LDO design

The presented research analyses different topologies of low dropout (LDO) regulator, mostly focusing on different frequency compensation schemes and power supply rejection analysis. This thesis discusses different analog LDO topologies and analyzes how they achieve stability using small signal analysis and related equations. The power supply rejection (PSR) of a different error amplifier and pass device has been analyzed and concluded that a Type-B amplifier with n-channel metal oxide semiconductor field effect transistor (MOSFET) output stage or a Type-A amplifier with p channel MOSFET (PMOS) output stage yields the best PSR. Digital LDO regulator topologies have also been discussed. The digital LDO regulator is intriguing due to its low power and synthesizability, but it suffers from coarse voltage regulation and poor PSR compared to the analog LDO regulator

Tomographic Reconstruction of Carboniferous Arthropods

Carboniferous fossils are often found as three-dimensional voids within siderite (FeCO3) nodules. Traditional techniques of study – splitting the host concretion and inspecting the surfaces revealed – do not allow the investigation of morphology within the part / counterpart, and prevent complete data recovery. X-ray micro-tomography (XMT) and 'virtual palaeontology' can overcome such limitations. This thesis documents the application of XMT to a number of Carboniferous arthropod groups. In the trigonotarbids (Arachnida: Trigonotarbida) the technique has revealed novel features such as coxal endites and tarsal claws, and allowed a taxonomic revision of the family Anthracomartidae. The harvestmen (Arachnida: Opiliones) have a sparse fossil record, resulting from their poorly sclerotized exoskeleton and terrestriality. Two new species have been reconstructed, greatly expanding morphological data from the early history of the group, and the cladistic assignment of both to extant clades supports molecular estimates of early (Palaeozoic) cladogenesis among the Opiliones. XMT of Compsoscorpius buthiformis (Arachnida: Scorpiones) has allowed a taxonomic revision of numerous Carboniferous scorpions, and provided insight regarding the species' mode of life. XMT analysis of stem-dictyopteran Archimylacris eggintoni (Insecta: Neoptera) – now one of the morphologically best known 'roachoid' fossils – has provided evidence that it was a fast runner, an adept climber and a detritivore. Two new species of insect nymph have also been reconstructed: a heavily spined example is quite unlike any previously described taxa, whereas the other has possible roachoid affinities. The investigation of the enigmatic arthropod Camptophyllia has failed to reveal a sternal surface or appendages, but has nevertheless provided new details of the morphology of this unusual taxon. XMT is a powerful new technique for studying siderite-hosted fossils: it reveals their morphology in great detail, and can inform debates regarding the mode of life, phylogeny, and taxonomy of a wide range of Carboniferous arthropods

GSI Scientific Report 2016

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Argonne National Laboratory Reports

Representatives of the Laboratories of the International Collaboration on Advanced Neutron Sources gathered between 28 June and 2 July, 1982 at Argonne National Laboratory for their sixth meeting, ICANS-VI. The meeting was the first opportunity for participants to see Argonne's Intense Pulsed Neutron Source, which went into full operation in August, 1981, and in an important sense celebrated the coming-on-line of this most recent entry into the world's complement of the new generation of neutron sources. The main topics of the meeting were "Targets and Moderators" and "Neutron Scattering Instrumentation", following what has become the customary rotation of subjects. An additional topic, "Nuclear Data and Codes" emerged this time as a separate entity, closely related to the Targets and Moderators subjects. These Proceedings are organized roughly in the order and organization of presentations. In addition, a record of some of the discussions is included following each Status Report, and separate summaries of discussions on various subjects of the topical sessions. The manuscripts have been reproduced essentially as received