1,587 research outputs found
(Table 2) Summary of lithofacies associations recognised in sediment core CRP-3
No full text(Table 2) Summary of lithofacies associations recognised in sediment core CRP-
Pliocene-Pleistocene marine cyclothems, Wanganui Basin, New Zealand: a lithostratigraphic framework
No full textThe Rangitikei River valley between Mangaweka and Vinegar Hill and the surrounding Ohingaiti region in eastern Wanganui Basin contains a late Pliocene to early Pleistocene (c. 2.6-1.7 Ma), c. 1100 m thick, southward-dipping (4-9deg.), marine cyclothemic succession. Twenty sedimentary cycles occur within the succession, each of which contains coarse-grained (siliciclastic sandstone and coquina) and fine-grained (siliciclastic siltstone) units. Nineteen of the cycles are assigned to the Rangitikei Group (new). Six new formations are defined within the Rangitikei Group, and their distribution in the Ohingaiti region is represented in a new geologic map. The new formations are named: Mangarere, Tikapu, Makohine, Orangipongo, Mangaonoho, and Vinegar Hill. Each formation comprises one or more cyclothems and includes a previously described and named distinctive basal horizon. Discrete sandstones, siltstones, and coquinas within formations are assigned member status and correspond to systems tracts in sequence stratigraphic nomenclature. The members provide the link between the new formational lithostratigraphy and the sequence stratigraphy of the Rangitikei Group. Base of cycle coquina members accumulated during episodes of sediment starvation associated with stratigraphic condensation on an open marine shelf during sea-level transgressions. Siltstone members accumulated in mid-shelf environments (50-100 m water depth) during sea-level highstands, whereas the overlying sandstone members are ascribed to inner shelf and shoreface environments (0-50 m water depth) and accumulated during falling eustatic sea-level conditions. Repetitive changes in water depth of 50-100 m magnitude are consistent with a glacio-eustatic origin for the cyclothems, which correspond to an interval of Earth history when successive glaciations in the Northern Hemisphere are known to have occurred. Moreover, the chronology of the Rangitikei River section indicates that Rangitikei Group cyclothems accumulated during short duration, 41 ka cycles in continental ice volume attributed to the dominance of the Milankovitch obliquity orbital parameter.
The Ohingaiti region has simple postdepositional structure. The late Pliocene formations dip generally to the SSW between 4deg. and 9deg.. Discernible discordances of c. 1deg. between successively younger formations are attributed to synsedimentary tilting of the shelf concomitant with migration of the tectonic hingeline southward into the basin. The outcrop distribution of the Rangitikei Group is strongly influenced by this regional tilt and also by three major northeast-southwest oriented, high-angle reverse faults (Rauoterangi, Pakihikura, and Rangitikei Faults)
Antarctic drilling recovers stratigraphic records from the continental margin
No full textThe Antarctic Geological Drilling (ANDRILL) program—a collaboration between Germany, Italy, New Zealand, and the United States that is one of the larger programs endorsed by the International Polar Year (IPY; http:// www .ipy .org)—successfully completed the drilling phase of the Southern McMurdo Sound (SMS) Project in December 2007. This second drill core of the program’s campaign in the western Ross Sea, Antarctica, complements the results of the first drilling season [Naish et al., 2007] by penetrating deeper into the stratigraphic section in the Victoria Land Basin and extending the recovered time interval back to approximately 20 million years ago.
The primary objectives of ANDRILL (http:// www .andrill .org/) were to recover stratigraphic records from the Antarctic continental margin that document key steps in Antarctica’s Cenozoic (0- to 65-million- year- old) climatic and glacial history, and in the tectonic evolution of the Transantarctic Mountains and the West Antarctic Rift System [Harwood et al., 2006]. These two ANDRILL stratigraphic drill cores are guiding the understanding of the speed, size, and frequency of the past 20 million years of glacial and interglacial changes in the Antarctic region. The drill cores will help to establish, through their correlation to existing records and their integration with climate and ice sheet models, how these local changes relate to regional and global events
(Table 1) Lithofacies interpretation and distribution in sediment core CRP-3
No full textSeven hundred and nineteen samples from throughout the Cainozoic section in CRP-3 were analysed by a Malvern Mastersizes laser particle analyser, in order to derive a stratigraphic distribution of grain-size parameters downhole. Entropy analysis of these data (using the method of Woolfe & Michibayashi, 1995) allowed recognition of four groups of samples, each group characterised by a distinctive grain-size distribution. Group 1, which shows a multi-modal distribution, corresponds to mudrocks, interbedded mudrock/sandstone facies, muddy sandstones and diamictites. Group 2, with a sand-grade mode but showing wide dispersion of particle size, corresponds to muddy sandstones, a few cleaner sandstones and some conglomerates. Group 3 and Group 4 are also sand-dominated, with better grain-size sorting, and correspond to clean, well-washed sandstones of varying mean grain-size (medium and fine modes, respectively). The downhole disappearance of Group 1, and dominance of Groups 3 and 4 reflect a concomitant change from mudrock- and diamictite-rich lithology to a section dominated by clean, well-washed sandstones with minor conglomerates. Progressive downhole increases in percentage sand and principal mode also reflect these changes. Significant shifts in grain-size parameters and entropy group membership were noted across sequence boundaries and seismic reflectors, as recognised in other studies
Evaluating Citebase, an open access Web-based citation-ranked search and impact discovery service
No full textCitebase is a new citation-ranked search and impact discovery service that measures citations of scholarly research papers which are openly accessible on the Web, i.e. papers that are assessable continuously online. Other services, such as ResearchIndex, have emerged in recent years to offer citation indexing of Web research papers. In the first detailed user evaluation of an open access Web citation indexing service, Citebase has been evaluated by nearly 200 users from different backgrounds. The paper details the procedures used in the evaluation, and analyses the results of this study, which took place between June and October 2002. It was found that within the scope of its primary components, the search interface and services available from its rich bibliographic records, Citebase can be used simply and reliably for the purpose intended, and that it compares favourably with other bibliographic services. It is shown tasks can be accomplished efficiently with Citebase regardless of the background of the user. More data need to be collected and the process refined before it is as reliable for measuring citation impact of indexed papers. Better explanations and guidance are required for first-time users. Coverage is seen as a limiting factor, even though Citebase indexes over 200,000 papers from arXiv. Non-physicists were frustrated at the lack of papers from other sciences. The principle of citation searching of open access archives has thus been demonstrated and need not be restricted to current users. Since the evaluation, Citebase has become a featured service of the ArXiv physics eprint archives
(Appendix 1) Planktonic foraminifera abundances in ODP Site 181-1123
No full textAge model of Hall et al. (2001, doi:10.1038/35090552
(Appendix 2) Paleotemperature reconstruction of ODP Site 181-1123
No full textAge model of Hall et al. (2001, doi:10.1038/35090552
Accepting Optimally in Automated Negotiation with Incomplete Information (abstract)
No full textIntelligent SystemsElectrical Engineering, Mathematics and Computer Scienc
Antarctic environmental change and ice sheet evolution through the Miocene to Pliocene – a perspective from the Ross Sea and George V to Wilkes Land Coasts
No full textThe Miocene to Pliocene (Neogene) occurred between 23.04 and 2.58 million years ago and includes intervals of peak global warmth where Earth’s average surface temperature was up to 8℃ warmer than present. Major cooling steps also occurred, across which Antarctica’s ice sheets advanced to the continental shelf for the first time and sea ice expanded across the Southern Ocean. Knowledge of Antarctic environmental change and ice sheet variability through this dynamic period in Earth history has advanced over the past 15 years. Major field and ship-based efforts to obtain new geological information have been completed and significant advances in numerical modelling approaches have occurred. Integration of ice proximal data and coupled climate-ice sheet model outputs with high-resolution reconstructions of ice volume and temperature variability from deep sea δ18O records now offer detailed insight into thresholds and tipping points in Earth’s climate system. Here we review paleoenvironmental data through key episodes in the evolution of Neogene climate to include the Miocene Climatic Optimum (MCO), Middle Miocene Climate Transition (MMCT), Tortonian Thermal Maximum (TTM), Late Miocene Cooling (LMC), and Pliocene Warm Period (PWP). This review shows that Antarctica’s climate and ice sheets remained dynamic throughout the Neogene. Given the analogous nature of warm episodes in the Miocene and Pliocene to future projections, the environmental reconstructions presented in this chapter offer a stark warning about the potential future of the AIS if warming continues at its current rate. If average global surface warming above pre-industrial values exceeds 2℃, a threshold will be crossed and AIS instabilities would likely be irreversible on multi-century timescales
Dr. Tim Brock
No full textTimothy R. Brock, PhD, CPT, CRP, ID(S&L+)
Dr. Tim Brock is the Founder and CEO of The Institute 4 Worthy Performance, a company dedicated to helping organizations apply the evidence-based principles, practices, and 10 international standards of performance improvement using 21st Century human capital big data analytics to achieve sustainable organizational and mission goals and objectives.
Dr. Brock’s PhD is in Education with a specialization in Training and Performance Improvement. He wrote his dissertation, “Training NASA Astronauts for Deep Space Exploration Missions: A Research Study to Develop and Validate a Competency-Based Training Framework” while he was the Senior Training and Human Performance Architect author for Lockheed Martin’s (LM) winning Crew Exploration Vehicle (now known as the Orion Multi-Purpose Crew Vehicle (MPCV)) proposal selected by NASA. His learning and sustainment architecture included the initial training and competency sustainment/development for all managers, mission maintainers, ground and mission controllers, and astronauts. Dr. Brock was also led a team of human performance engineers to JSC to conduct a training situation analysis of mission controller training that resulted in a white paper of options NASA could adopt to decrease time and cost to proficiency. He also supported LM’s Facility Development and Operations Contract (FDOC) with NASA with the NASA Constellation Training Facility (CxTF) leadership team. During his Air Force career, Dr. Brock was also a US Air Force missile launch officer for two ICBM weapon systems and was responsible for the initial qualification weapon system academic classroom and high fidelity simulation curriculum for all missile launch officer candidates for all five of the US Air Force’s ICBM fleet.
In addition, while he was manager of LM’s Global Training and Science of Learning and Performance Improvement initiatives, Dr. Brock established and led a R&D and analysis team of distinguished, PhD-level, multi-disciplinary team of behavioral, social, cognitive, learning, and technology scientists and practitioners. His team crafted proprietary thought leadership (e.g., R&D, white papers, patents, etc.) in Human Cognitive and Behavior Modeling research to improve the effectiveness of the Human-in-the-Loop (HITL) within complex organization and technical systems. Dr. Brock’s team also provided innovative discriminator capabilities to solve complex, 100M+ bottom line learning and human performance challenges for existing and potential customers. For example, he was also the Principal Investigator for an R&D initiative that collaborated with a major health care provider to conduct a proof-of-concept prototype that integrated simulation technologies in an immersive learning environment to rapidly develop the affective, cognitive, and metacognitive skills of novice and experienced nurses. As a result of this proof-of-concept study, Dr. Brock was the lead inventor of a company-sponsored, patent-pending “Method and System for Accelerated Guided Experiential Learning and Performance Improvement” innovative instructional architecture. The invention created a method and system to generate a competency continuum of increasing competency levels, by interviewing a plurality of competency exemplar sets to elicit knowledge associated with a terminal skills and identifying cognitive discriminators associated with each competency level from the knowledge to establish cue-action schema norms to assess cognitive development.
Dr. Brock is a Certified Performance Improvement Practitioner through the International Society for Performance Improvement, a Certified Return on Investment Professional through the ROI Institute, and a Certified Instructional Designer with a specialization in high-fidelity simulations and labs through The Institute for Performance Improvement.
Dr. Brock’s PhD is in Education with a specialization in Training and Performance Improvement. He wrote his dissertation, “Training NASA Astronauts for Deep Space Exploration Missions: A Research Study to Develop and Validate a Competency-Based Training Framework” while he was the Senior Training and Human Performance Architect author for Lockheed Martin’s (LM) winning Crew Exploration Vehicle (now known as the Orion Multi-Purpose Crew Vehicle (MPCV)) proposal selected by NASA. His learning and sustainment architecture included the initial training and competency sustainment/development for all managers, mission maintainers, ground and mission controllers, and astronauts. Dr. Brock was also led a team of human performance engineers to JSC to conduct a training situation analysis of mission controller training that resulted in a white paper of options NASA could adopt to decrease time and cost to proficiency. He also supported LM’s Facility Development and Operations Contract (FDOC) with NASA with the NASA Constellation Training Facility (CxTF) leadership team. During his Air Force career, Dr. Brock was also a US Air Force missile launch officer for two ICBM weapon systems and was responsible for the initial qualification weapon system academic classroom and high fidelity simulation curriculum for all missile launch officer candidates for all five of the US Air Force’s ICBM fleet.
In addition, while he was manager of LM’s Global Training and Science of Learning and Performance Improvement initiatives, Dr. Brock established and led a R&D and analysis team of distinguished, PhD-level, multi-disciplinary team of behavioral, social, cognitive, learning, and technology scientists and practitioners. His team crafted proprietary thought leadership (e.g., R&D, white papers, patents, etc.) in Human Cognitive and Behavior Modeling research to improve the effectiveness of the Human-in-the-Loop (HITL) within complex organization and technical systems. Dr. Brock’s team also provided innovative discriminator capabilities to solve complex, 100M+ bottom line learning and human performance challenges for existing and potential customers. For example, he was also the Principal Investigator for an R&D initiative that collaborated with a major health care provider to conduct a proof-of-concept prototype that integrated simulation technologies in an immersive learning environment to rapidly develop the affective, cognitive, and metacognitive skills of novice and experienced nurses. As a result of this proof-of-concept study, Dr. Brock was the lead inventor of a company-sponsored, patent-pending “Method and System for Accelerated Guided Experiential Learning and Performance Improvement” innovative instructional architecture. The invention created a method and system to generate a competency continuum of increasing competency levels, by interviewing a plurality of competency exemplar sets to elicit knowledge associated with a terminal skills and identifying cognitive discriminators associated with each competency level from the knowledge to establish cue-action schema norms to assess cognitive development.
Dr. Brock is a Certified Performance Improvement Practitioner through the International Society for Performance Improvement, a Certified Return on Investment Professional through the ROI Institute, and a Certified Instructional Designer with a specialization in high-fidelity simulations and labs through The Institute for Performance Improvement.https://commons.erau.edu/space-congress-bios-2016/1027/thumbnail.jp
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