Multidecadal warming of Antarctic waters

Decadal trends in the properties of seawater adjacent to Antarctica are poorly known, and the mechanisms responsible for such changes are uncertain. Antarctic ice sheet mass loss is largely driven by ice shelf basal melt, which is influenced by ocean-ice interactions and has been correlated with Antarctic Continental Shelf Bottom Water (ASBW) temperature. We document the spatial distribution of long-term large-scale trends in temperature, salinity, and core depth over the Antarctic continental shelf and slope. Warming at the seabed in the Bellingshausen and Amundsen seas is linked to increased heat content and to a shoaling of the mid-depth temperature maximum over the continental slope, allowing warmer, saltier water greater access to the shelf in recent years. Regions of ASBW warming are those exhibiting increased ice shelf melt

Corrosion-protective coatings from electrically conducting polymers

In a joint effort between NASA Kennedy and LANL, electrically conductive polymer coatings were developed as corrosion protective coatings for metal surfaces. At NASA Kennedy, the launch environment consist of marine, severe solar, and intermittent high acid and/or elevated temperature conditions. Electrically conductive polymer coatings were developed which impart corrosion resistance to mild steel when exposed to saline and acidic environments. Such coatings also seem to promote corrosion resistance in areas of mild steel where scratches exist in the protective coating. Such coatings appear promising for many commercial applications

Crosstalk between the M1 muscarinic acetylcholine receptor and the endocannabinoid system: A relevance for Alzheimer's disease?

Alzheimer's disease (AD) is a neurodegenerative disorder which accounts for 60-70% of the 50 million worldwide cases of dementia and is characterised by cognitive impairments, many of which have long been associated with dysfunction of the cholinergic system. Although the M muscarinic acetylcholine receptor (mAChR) is considered a promising drug target for AD, ligands targeting this receptor have so far been unsuccessful in clinical trials. As modulatory receptors to cholinergic transmission, the endocannabinoid system may be a promising drug target to allow fine tuning of the cholinergic system. Furthermore, disease-related changes have been found in the endocannabinoid system during AD progression and indeed targeting the endocannabinoid system at specific disease stages alleviates cognitive symptoms in numerous mouse models of AD. Here we review the role of the endocannabinoid system in AD, and its crosstalk with mAChRs as a potential drug target for cholinergic dysfunction. [Abstract copyright: Copyright © 2019. Published by Elsevier Inc.

The Seasonal Cycle and Interannual Variability in Stratospheric Temperatures and Links to the Brewer–Dobson Circulation: An Analysis of MSU and SSU Data

Previous studies have shown that lower-stratosphere temperatures display a near-perfect cancellation between tropical and extratropical latitudes on both annual and interannual time scales. The out-of-phase relationship between tropical and high-latitude lower-stratospheric temperatures is a consequence of variability in the strength of the Brewer–Dobson circulation (BDC). In this study, the signal of the BDC in stratospheric temperature variability is examined throughout the depth of the stratosphere using data from the Stratospheric Sounding Unit (SSU). While the BDC has a seemingly modest signal in the annual cycle in zonal-mean temperatures in the mid- and upper stratosphere, it has a pronounced signal in the month-to-month and interannual variability. Tropical and extratropical temperatures are significantly negatively correlated in all SSU channels on interannual time scales, suggesting that variations in wave driving are a major factor controlling global-scale temperature variability not only in the lower stratosphere (as shown in previous studies), but also in the mid- and upper stratosphere. The out-of-phase relationship between tropical and high latitudes peaks at all levels during the cold-season months: December–March in the Northern Hemisphere and July–October in the Southern Hemisphere. In the upper stratosphere, the out-of-phase relationship with high-latitude temperatures extends beyond the tropics and well into the extratropics of the opposite hemisphere. The seasonal cycle in stratospheric temperatures follows the annual march of insolation at all levels and latitudes except in the mid- to upper tropical stratosphere, where it is dominated by the semiannual oscillation. M

Meridional heat transport across the Antarctic Circumpolar Current by the Antarctic Bottom Water overturning cell

The heat transported by the lower limb of the Southern Ocean meridional overturning circulation is commonly held to be negligible in comparison with that transported by eddies higher in the water column. We use output from one of the first global high resolution models to have a reasonably realistic export of Antarctic Bottom Water, the OCCAM one twelfth degree model. The heat fluxed southward by the deep overturning cell using the annual mean field for 1994 at 56S is 0.033 PW, but the 5-day mean fields give a larger heat flux (0.048 and 0.061 PW depending on calculation method). This is more than 30% of previous estimates of the total heat flux. Eddies and other transients add considerably to the heat flux. These results imply that this component of meridional heat flux may not be negligible as has been supposed

STEAM (SCIENCE, TECHNOLOGY, ENGINEERING, ART, AND MATHEMATICS) EDUCATION AND TEACHERS’ PEDAGOGICAL DISCONTENTMENT LEVELS

Literature focused on the emerging implementation of STEAM (Science, Technology, Engineering, Art, and Mathematics) education within K-12 education programs in the USA emphasizes the need for researchers to address the potential for disrupting the pedagogical contentment of teachers assigned to teach in STEAM disciplines who have no backgrounds in the fields represented by STEAM and/or who have no prior teaching experience in the areas of STEAM. Research objectives for the current study focused on examining the influence of intensive professional development on K-12 teachers’ pedagogical discontentment levels relative to the implementation of STEAM in all classrooms within a rural school district in the southeast region of the United States. Data sources included: (a) pre-post assessments of 93 teachers’ pedagogical discontentment levels; (b) classroom observation data collected by external observers; and (c) teachers’ perceptions of STEAM coaching.  Data retrieved were analyzed using quantitative analyses. Study findings indicated teachers’ pedagogical discontentment levels decreased over time. Future research must support teachers new to STEAM activities

Harnessing Marine Renewable Energy from Poole Harbour: Case Study

Global warming and its impact on our environment, society, economies and security is one of the fundamental concerns of our time. In response, the United Kingdom government has put in place a legally binding target of an 80% reduction in greenhouse gas emissions on 1990 levels by 2050. The United Kingdom will need to achieve a tenfold expansion of energy supply from renewable sources by 2020 to meet its share of the European Union renewable energy target. The marine and coastal environment’s renewable energy potential in Britain is high. It is estimated that it has 50% of the tidal energy, 35% of wave and 40% of wind resources in the European Union. Use of geothermal resources using heat pump technology is the least evolved sector, but in 2010 contributed to 0.7 TWh of energy and it is believed that non domestic heat pumps could contribute up to 22 TWh by 2020. In the Southwest of England, Poole Harbour has been recognised as a potential, highly predictable source of tidal and heat energy. Local groups are embarking on a feasibility study for harnessing this energy for the benefit of the community. The purpose of this article is to examine the potential conflict of interest between the laudable aims of promoting the use of renewable energy and of safeguarding ecosystems and their biodiversity. Using Poole Harbour as a case study, it will consider the environmental and economic costs and benefits of a Community Renewable Energy project (the Poole Tidal Energy Partnership) in the context of an area subject to a number of statutory and non-statutory designations to protect nationally and internationally important habitats and species. The paper identifies key environmental legislation, including spatial planning law and policy, which will facilitate exploring whether there is potential for reconciling what may be perceived as competing objectives for sustainable development

Urban transport networks and overseas visitors : analysis of the factors affecting usage and the implications for destination management

Whilst transport has repeatedly been identified as an integral component in the tourism system, the relationship between urban public transport networks and visitor behaviour at urban destinations remains largely unexplored. Furthermore, tourist transport is rarely the subject of the same quality benchmarking techniques that are applied to other elements of the tourism product. The thesis reviews the use of service quality and customer satisfaction measures in urban tourism and urban public transport, highlighting dimensions of urban public transport quality which may be of particular relevance to overseas visitors at urban destinations. The results of a survey of overseas visitors to Greater Manchester, employing both quantitative and qualitative data collection techniques, are subsequently presented, identifying factors affecting the use of public transport by overseas visitors to Greater Manchester. Attributes of public transport service quality, revealed by the research to be of importance in measuring overseas visitors’ satisfaction with urban public transport performance in Greater Manchester, are reduced by means of principal components analysis to reveal the underlying dimensions of overseas visitors’ satisfaction with Manchester’s public transport system. An ensuing regression analysis reveals the relationships between the dimensions of public transport performance, overall satisfaction with public transport and satisfaction with Manchester as a visitor destination. Additionally, an importance-performance analysis is employed to uncover the strengths and weaknesses of public transport service in Manchester from an overseas visitor perspective. The implications for destination management are discussed.EThOS - Electronic Theses Online ServiceGBUnited Kingdo

Connectivity & Communication: A Study of How Small Wine Businesses Use the Internet

This paper addresses the development and effects of Internet use by small wine businesses.   It includes useful insights that can be applied to other small businesses, and also provides helpful information for consultants and entrepreneurship educators. An exploratory framework is presented that includes a four-stage sequence through which small businesses typically progress in relation to the use of Internet-related tools. The stages include awareness, design, implementation, and practice. Propositions are also developed to guide analysis of the framework, and an  empirical test of various parts of the framework is performed using a sample of 382 wineries. Results showed that, beyond the use of e-mail for communication and connectivity, awareness of the Internet's uses is moderate, while implementation is moderate to low. Thirty-nine percent of the respondents believe the Internet will make a strong contribution to sales and profitability in the future, though only 9% report they are currently achieving this with Internet utilization

XPS and XMCD study of Fe3O4/GaAs interface

Ultrathin Fe oxide films of various thicknesses prepared by post-growth oxidation on GaAs(100) surface have been investigated with X-ray photoelectron spectroscopy (NPS), X-ray absorption spectroscopy (XAS), and X-ray magnetic circular dichroism (XMCD). The XPS confirms that the surfaces of the oxide are Fe3O4 rather than Fe2O3. XAS and XMCD measurements indicate the presence of nsulating Fe divalent oxide phases (FeO) beneath the surface Fe-3 O-4 layer with the sample thickness above 4 mn. This FeO might act as a barrier for the spin injection into the GaAs