The relationship between the aboveground dry weight and diameter for a wide size range of erect land plants

1984 ◽  
Vol 62 (11) ◽  
pp. 2370-2374 ◽  
Author(s):  
B. Freedman
Keyword(s):  
Standing Crop ◽  
Size Range ◽  
Terrestrial Ecosystems ◽  
Dry Weight ◽  
Land Plants ◽  
High Wind ◽  
Site Specific ◽  
Wind Speeds ◽  
The Relationship ◽  
Wide Size Range

For 765 stems of plants that spanned eight orders of magnitude of aboveground dry weight (DWT) and three orders of magnitude of stem diameter (DIAM), a plot of log10DWT vs. log10DIAM was highly linear, with an r2 value of 0.997 and a slope of 2.6. The value of this slope may be related to the minimum diameters that are required by upright plants to withstand the horizontal forces of drag that arc exerted at high wind speeds. The multispecies biomass regression gave a similar estimate of the standing crop of a conifer stand to that computed using species- and site-specific tree regressions, indicating the possible general use of such equations in estimating the standing crops of terrestrial ecosystems.

The Relationship Between Colliery-waste Particle Sizes and Plant Growth

1974 ◽  
Vol 1 (4) ◽  
pp. 281-284 ◽  
Author(s):  
Christopher G. Down
Keyword(s):  
Particle Size ◽  
Plant Growth ◽  
Water Retention ◽  
Size Range ◽  
Growth Period ◽  
Dry Weight ◽  
Particle Sizes ◽  
Small Particles ◽  
The Relationship ◽  
Water Holding

Seed germination and dry-weight production in Lolium perenne were examined in relation to growth on 12-years-old colliery waste separated into seven size-fractions. The size-range was from more than 4,000 μ to less than 125 μ, and the growth period was up to 30 days. Germination percentages after 6 days generally increased with decreasing particle-size, as did dry-weight. Shoot : root ratios also showed an inverse relationship with particle size.After 30 days there was no distinction between dryweights on different particle sizes, except that on the largest fractions it had been found impossible to keep the plants alive. Problems of water-holding capacity are discussed, and the significance of soil particle-size in revegetation work is examined, it being concluded that an admixture of small particles is important for water retention and plant growth.

scholarly journals A social Beaufort scale to detect high winds using language in social media posts

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Iain S. Weaver ◽  
Hywel T. P. Williams ◽  
Rudy Arthur
Keyword(s):  
Social Media ◽  
Wind Speed ◽  
Temporal Correlation ◽  
Weather Conditions ◽  
Local Area ◽  
High Wind ◽  
Wind Speeds ◽  
The Uk ◽  
The Relationship ◽  
High Winds

AbstractPeople often talk about the weather on social media, using different vocabulary to describe different conditions. Here we combine a large collection of wind-related Twitter posts (tweets) and UK Met Office wind speed observations to explore the relationship between tweet volume, tweet language and wind speeds in the UK. We find that wind speeds are experienced subjectively relative to the local baseline, so that the same absolute wind speed is reported as stronger or weaker depending on the typical weather conditions in the local area. Different linguistic tokens (words and emojis) are associated with different wind speeds. These associations can be used to create a simple text classifier to detect ‘high-wind’ tweets with reasonable accuracy; this can be used to detect high winds in a locality using only a single tweet. We also construct a ‘social Beaufort scale’ to infer wind speeds based only on the language used in tweets. Together with the classifier, this demonstrates that language alone is indicative of weather conditions, independent of tweet volume. However, the number of high-wind tweets shows a strong temporal correlation with local wind speeds, increasing the ability of a combined language-plus-volume system to successfully detect high winds. Our findings complement previous work in social sensing of weather hazards that has focused on the relationship between tweet volume and severity. These results show that impacts of wind and storms are found in how people communicate and use language, a novel dimension in understanding the social impacts of extreme weather.

scholarly journals Flexible Characterization: Herstorical Performance in Heritage Sites

2020 ◽  
Vol 36 (4) ◽  
pp. 355-368
Author(s):  
Victoria Bianchi
Keyword(s):  
Identity Performance ◽  
School Of Education ◽  
Site Specific ◽  
Heritage Sites ◽  
Women's Narratives ◽  
Specific Performance ◽  
Spatial Exploration ◽  
The University ◽  
Heritage Performance ◽  
The Relationship

This article explores how performance and character can be used to represent the lives of real women in spaces of heritage. It focuses on two different site-specific performances created by the author in the South Ayrshire region of Scotland: CauseWay: The Story of the Alloway Suffragettes and In Hidden Spaces: The Untold Stories of the Women of Rozelle House. These were created with a practice-as-research methodology and aim to offer new models for the use of character in site-specific performance practice. The article explores the variety of methods and techniques used, including verbatim writing, spatial exploration, and Herstorical research, in order to demonstrate the ways in which women’s narratives were represented in a theoretically informed, site-specific manner. Drawing on Phil Smith’s mythogeography, and responding to Laurajane Smith’s work on gender and heritage, the conflicting tensions of identity, performance, and authenticity are drawn together to offer flexible characterization as a new model for the creation of feminist heritage performance. Victoria Bianchi is a theatre-maker and academic in the School of Education at the University of Glasgow. Her work explores the relationship between space, feminism, and identity. She has written and performed work for the National Trust for Scotland, Camden People’s Theatre, and Assembly at Edinburgh, among other institutions.

scholarly journals Dependence of Power Characteristics on Savonius Rotor Segmentation

Energies ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2912
Author(s):  
Krzysztof Doerffer ◽  
Janusz Telega ◽  
Piotr Doerffer ◽  
Paulina Hercel ◽  
Andrzej Tomporowski
Keyword(s):  
High Wind ◽  
Horizontal Axis Wind Turbine ◽  
Savonius Rotor ◽  
Power Characteristics ◽  
Wind Speeds ◽  
Single Segment ◽  
High Elongation ◽  
Low Wind Speeds ◽  
Number Of Segments ◽  
Rotor Type

Savonius rotors are large and heavy because they use drag force for propulsion. This leads to a larger investment in comparison to horizontal axis wind turbine (HAWT) rotors using lift forces. A simple construction of the Savonius rotor is preferred to reduce the production effort. Therefore, it is proposed here to use single-segment rotors of high elongation. Nevertheless, this rotor type must be compared with a multi-segment rotor to prove that the simplification does not deteriorate the effectiveness. The number of segments affects the aerodynamic performance of the rotor, however, the results shown in the literature are inconsistent. The paper presents a new observation that the relation between the effectiveness of single- and multi-segment rotors depends on the wind velocity. A single-segment rotor becomes significantly more effective than a four-segment rotor at low wind speeds. At high wind speeds, the effectiveness of both rotors becomes similar.

scholarly journals Embodying the Site: the Here and Now in Site-Specific Dance Performance

2005 ◽  
Vol 21 (4) ◽  
pp. 367-381 ◽  
Author(s):  
Victoria Hunter
Keyword(s):  
Creative Process ◽  
Dance Performance ◽  
Site Specific ◽  
The Creation ◽  
Spirit Of Place ◽  
The Moment ◽  
The University ◽  
The Relationship

In this article, Victoria Hunter explores the concept of the ‘here and now’ in the creation of site-specific dance performance, in response to Doreen Massey's questioning of the fixity of the concept of the ‘here and now’ during the recent RESCEN seminar on ‘Making Space’, in which she challenged the concept of a singular fixed ‘present’, suggesting instead that we exist in a constant production of ‘here and nows’ akin to ‘being in the moment’. Here the concept is applied to an analysis of the author's recent performance work created as part of a PhD investigation into the relationship between the site and the creative process in site-specific dance performance. In this context the notion of the ‘here and now’ is discussed in relation to the concept of dance embodiment informed by the site and the genius loci, or ‘spirit of place’. Victoria Hunter is a Lecturer in Dance at the University of Leeds, who is currently researching a PhD in site-specific dance performance.

scholarly journals Dental functional traits of mammals resolve productivity in terrestrial ecosystems past and present

2012 ◽  
Vol 279 (1739) ◽  
pp. 2793-2799 ◽  
Author(s):  
Liping Liu ◽  
Kai Puolamäki ◽  
Jussi T. Eronen ◽  
Majid M. Ataabadi ◽  
Elina Hernesniemi ◽  
...  
Keyword(s):  
Net Primary Productivity ◽  
Terrestrial Ecosystems ◽  
Functional Trait ◽  
Geological Time ◽  
Crown Height ◽  
Short Term ◽  
Functional Interpretation ◽  
Terrestrial Mammals ◽  
Terrestrial Biomes ◽  
The Relationship

We have recently shown that rainfall, one of the main climatic determinants of terrestrial net primary productivity (NPP), can be robustly estimated from mean molar tooth crown height (hypsodonty) of mammalian herbivores. Here, we show that another functional trait of herbivore molar surfaces, longitudinal loph count, can be similarly used to extract reasonable estimates of rainfall but also of temperature, the other main climatic determinant of terrestrial NPP. Together, molar height and the number of longitudinal lophs explain 73 per cent of the global variation in terrestrial NPP today and resolve the main terrestrial biomes in bivariate space. We explain the functional interpretation of the relationships between dental function and climate variables in terms of long- and short-term demands. We also show how the spatially and temporally dense fossil record of terrestrial mammals can be used to investigate the relationship between biodiversity and productivity under changing climates in geological time. The placement of the fossil chronofaunas in biome space suggests that they most probably represent multiple palaeobiomes, at least some of which do not correspond directly to any biomes of today's world.

Cold tolerance of the Antarctic springtail Gomphiocephalus hodgsoni (Collembola, Hypogastruridae)

2001 ◽  
Vol 13 (3) ◽  
pp. 271-279 ◽  
Author(s):  
Brent J. Sinclair ◽  
Heidi Sjursen
Keyword(s):  
Cold Tolerance ◽  
Thermal Environment ◽  
Strong Relationship ◽  
Dry Weight ◽  
Glycerol Content ◽  
Recrystallization Inhibition ◽  
Low Levels ◽  
Inhibition Studies ◽  
The Antarctic ◽  
The Relationship

Cold tolerance of the springtail Gomphiocephalus hodgsoni Carpenter (Collembola: Hypogastruridae) was studied at Cape Bird, Ross Island, Antarctica (77°13′S, 166°26′E). Microclimate temperatures indicate a highly seasonal thermal environment, with winter minima <–39°C. Snow cover significantly buffers both minimum temperatures and cooling rates. Gomphiocephalus hodgsoni survives low temperatures by avoiding freezing. Mean low group supercooling points (SCPs) ranged from –35.4°C in October to –28.3°C in January. The lowest SCP measured was –38.0°C. The high SCP group was very small, making up only 18% of the population in January. In October, G. hodgsoni had a very high glycerol content (>80 μg mg−1 dry weight), although this declined rapidly to low levels (c. 7–10 μg mg−1 dry weight) in January. Quantities of glucose and trehalose were low during October, but steadily increased throughout the summer. Haemolymph osmolality was exceptionally high (up to 1755 mOsm kg−1) at the end of November, but this rapidly declined to c. 500 mOsm kg−1 by late December. The presence of thermal hystersis proteins was indicated by both osmometry on haemolymph samples and recrystallization inhibition studies of springtail homogenates. There was a strong relationship between glycerol content and SCP, but the relationship between haemolymph osmolality, SCP and carbohydrates is uncertain.

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