The impact of base-level analyses on stratospheric circulation statistics for the Southern Hemisphere

1989 ◽  
Vol 130 (2-3) ◽  
pp. 181-194 ◽  
Author(s):  
David J. Karoly
Author(s):  
Diarmaid Lane ◽  
Sheryl Sorby

AbstractIn recent years, there has been a surge in research in spatial thinking across the international community. We now know that spatial skills are malleable and that they are linked to success across multiple disciplines, most notably Science, Technology, Engineering and Mathematics (STEM). While spatial skills have been examined by cognitive scientists in laboratory environments for decades, current research is examining how these skills can be developed in field-based environments. In this paper, we present findings from a study within a Technology Teacher preparation programme where we examined first-year students’ spatial skills on entry to university. We explain why it was necessary to embed a spatial skills intervention into Year 1 of the programme and we describe the impact that this had on students’ spatial scores and on academic performance. The findings from our study highlight a consistent gender gap in spatial scores at the start of the first-year with female students entering the Technology Teacher preparation programme at a lower base level than male students. We describe how we integrated spatial development activities into an existing course and how an improvement in spatial scores and overall course performance was observed. The paper concludes by discussing the long-term sustainability of integrating spatial interventions within teacher preparation programmes while also highlighting the importance of future research to examine spatial skills as a fundamental component of technological capability.


2021 ◽  
Vol 14 (9) ◽  
pp. 638-644
Author(s):  
Brian Zambri ◽  
Susan Solomon ◽  
David W. J. Thompson ◽  
Qiang Fu

2018 ◽  
Vol 10 (11) ◽  
pp. 4047 ◽  
Author(s):  
Jinchao Li ◽  
Tianzhi Li ◽  
Liu Han

In order to eliminate the impact of inter-regional differentiation of development demand on the objective evaluation of the development level of smart grid, this paper establishes the evaluation model of weight modification, transmission mechanism and combination of subjective and objective weights. Firstly, the Analytic Hierarchy Process method is used to calculate the weights of evaluation indices of effect layer and then the indices of development demand are used to modify the weights of them. The association analysis and the correlation coefficient are used to establish the weights conduction coefficient between the effect level and the base level. Then the subjective weights of the indices of the base layer are calculated. The objective weights of the indices of the base layer are obtained by using the entropy method. The subjective weights of the base layer and the objective weights obtained by the entropy method are averagely calculated, and the comprehensive weights of the evaluation indices of the base layer are obtained. Then each index is scored according to the weights and index values. Finally, the model is used to quantitatively inspect the level of development of smart grid in specific regions and make a horizontal comparison, which provides a useful reference for the development of smart grids. The relevant examples verify the correctness and validity of the model.


2009 ◽  
Vol 99 (3-4) ◽  
pp. 535-546 ◽  
Author(s):  
Ricardo M. Trigo ◽  
J. M. Vaquero ◽  
R. B. Stothers

2019 ◽  
Author(s):  
Erik Schmölter ◽  
Jens Berdermann ◽  
Norbert Jakowski ◽  
Christoph Jacobi

Abstract. This study correlates different ionospheric parameters with the integrated solar EUV radiation for an analysis of the delayed ionospheric response in order to confirm previous studies on the delay and to further specify variations of the delay. Several time series for correlation coefficients and delays are presented to characterize the trend of the delay from 2011 to 2013. The impact of the diurnal variations of ionospheric parameters in the analysis on hourly resolution for fixed locations are discussed and specified with calculations in different time scales and with comparison to solar and geomagnetic activity. An average delay for TEC of ≈ 18.7 hours and for foF2 of ≈ 18.6 hours is calculated at four European stations. Through comparison with the Australian region the difference between northern and southern hemisphere is analyzed and a seasonal variation of the delay between northern and southern hemisphere is calculated for TEC with ≈ 5 ± 0.7 hours and foF2 with ≈ 8 ± 0.8 hours. The latitudinal and longitudinal variability of the delay is analyzed for the European region and a decrease of the delay from ≈ 21.5 hours at 30° N to ≈ 19.0 hours at 70° N has been found. For winter months a roughly constant delay of ≈ 19.5 hours is calculated. In this study a North-South trend of the ionospheric delay during summer month has been observed with ≈ 0.06 hours per degree in latitude. The results based on solar and ionospheric data in hourly resolution and the analysis of the delayed ionospheric response to solar EUV show the seasonal and latitudinal variations. Results also indicate the dependence on the geomagnetic activity as well as on the 11-year solar cycle.


2016 ◽  
Vol 43 (13) ◽  
pp. 7160-7167 ◽  
Author(s):  
Eun-Pa Lim ◽  
Harry H. Hendon ◽  
Julie M. Arblaster ◽  
Francois Delage ◽  
Hanh Nguyen ◽  
...  

2017 ◽  
Vol 57 (2) ◽  
pp. 434
Author(s):  
Rob Duncanson ◽  
Walter P. Purio

This paper explores the emerging market for liquefied natural gas (LNG) as a marine fuel, with a particular focus on the market in Australasia. While LNG as a marine fuel is a growing market in the northern hemisphere, slower rates of adoption of LNG fuel technologies in maritime industry are evident in the southern hemisphere. This paper aims to ground the Australasian LNG marine fuel market in a global context and to explore opportunities for Australia to lead the region in developing and adopting LNG as a marine fuel. This paper looks at the key drivers behind championing LNG as a marine fuel, focusing on four main areas of impact; economy, environment, public health and innovation. This paper uses Australia as a case study for the adoption of LNG as a marine fuel in the southern hemisphere. It considers the opportunities presented by LNG as a marine fuel to assist Australia in: achieving energy independence; reducing the impact of air pollution from ships on the environment and public health; and positioning Australia as an innovative leader in LNG as a marine fuel.


1987 ◽  
Vol 11 (1) ◽  
pp. 9-14 ◽  
Author(s):  
Jon P. Caulfield ◽  
David B. South ◽  
James N. Boyer

Abstract Lowering nursery seedbed density can increase the proportion of high-quality (grade 1 and 2) seedlings relative to cull (grade 3) seedlings. Outplanting higher grade seedlings can increase survival and volume production. Lowering seedbed density from present levels may therefore increasestand value at rotation age. The relationship between four seedbed density levels (60, 90, 120, and 150 seedlings/lineal bed foot) is evaluated for slash (Pinus elliottii Engelm.) and loblolly (Pinus taeda L.) pine, and the impact of grade on growth performance is projected. An economic analysisdemonstrates how to determine the present value of the expenditure justified to alter seedbed density to obtain a projected future change in out-planting performance. Potential economic gains ranging from - $4.13 to $2 7.58 per thousand seedlings were derived by altering seedbeddensity from a base-level density of 120 seedlings/lineal bed foot. Positive values were associated with decreases in density and negative values with density increases. Site quality of outplanted areas plays a major role in determining the amount of the justifiable expenditure. South. J.Appl. For. 11(1):9-14.


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