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16 results for “Chalk”
Figure 2 in Spatial segregation between the native Tropical mockingbird and the invader Chalk-browed mockingbird (Passeriformes: Mimidae) along a Neotropical natural-urban gradient
Figure 2. Abundance (Punctual Abundance Index) of Tropical mockingbird (Mimus gilvus, closed circle and continuous line) and Chalk-browed mockingbird (M. saturninus, open circle and dashed line) regarding urbanization index (Normalized Difference Built-up Index) in a coastal region of southeastern Brazil. Urbanization increases toward a higher urbanization index.
Figure 1 in Spatial segregation between the native Tropical mockingbird and the invader Chalk-browed mockingbird (Passeriformes: Mimidae) along a Neotropical natural-urban gradient
Figure 1. Sampling design (transects) in the municipalities of Vila Velha and Guarapari, state of Espírito Santo, southeastern Brazil.
Рис. 8–13. ΔанΑшафты Южного УраΛа (8–11) и Русской равнины (12–13). 8 – разнотравная степь у поΑножия горы ВербΛюжка, местообитание Cionus rossicus; 9 – ксерофитные Λуга в пойме реки УраΛ вбΛизи горы ВербΛюжка, местообитание Cionus rossicus; 10 – южные степи в районе КзыΛаΑырского карстового поΛя, местообитание Cionus gebleri; 11 – степи низкогорий Южного УраΛа бΛиз с. КиΑрясово, местообитание Smicronyx albopictus; 12 – КаменноброΑские меΛовые горы на юго-запаΑе ПривоΛжской возвышенности, местообитание Mecinus janthiniformis, Smicronyx robustus и S. albopictus; 13 – меΛовой останец КобыΛья ГоΛова в прироΑном парке «Àонской», местообитание Mecinus janthiniformis. Figs 8–13. Landscapes of the Southern Urals (8–11) and the Russian Plain (12–13). 8 – forb steppe at the down of Verblyuzhka Mt., habitat of Cionus rossicus; 9 – xerophytic meadows in the floodplain of the Ural River near Verblyuzhka Mt., habitat of Cionus rossicus; 10 – southern steppes in the Kzyladyr karst area, habitat of Cionus gebleri; 11 – steppes of the low mountains of the Southern Urals near Kidryasovo village, habitat of Smicronyx albopictus; 12 – Kamennobrodsky chalk mountains in the southwest of the Volga Upland, habitat of Mecinus janthiniformis, Smicronyx robustus, and S. albopictus; 13 – Cretaceous outlier Kobyl'ya Golova in the Donskoy Nature Park, habitat of Mecinus janthiniformis. in Interesting records of weevils (Coleoptera: Curculionidae: Curculioninae) in the steppe zone of the European part of Russia and the Urals
Рис. 8–13. ΔанΑшафты Южного УраΛа (8–11) и Русской равнины (12–13). 8 – разнотравная степь у поΑножия горы ВербΛюжка, местообитание Cionus rossicus; 9 – ксерофитные Λуга в пойме реки УраΛ вбΛизи горы ВербΛюжка, местообитание Cionus rossicus; 10 – южные степи в районе КзыΛаΑырского карстового поΛя, местообитание Cionus gebleri; 11 – степи низкогорий Южного УраΛа бΛиз с. КиΑрясово, местообитание Smicronyx albopictus; 12 – КаменноброΑские меΛовые горы на юго-запаΑе ПривоΛжской возвышенности, местообитание Mecinus janthiniformis, Smicronyx robustus и S. albopictus; 13 – меΛовой останец КобыΛья ГоΛова в прироΑном парке «Àонской», местообитание Mecinus janthiniformis. Figs 8–13. Landscapes of the Southern Urals (8–11) and the Russian Plain (12–13). 8 – forb steppe at the down of Verblyuzhka Mt., habitat of Cionus rossicus; 9 – xerophytic meadows in the floodplain of the Ural River near Verblyuzhka Mt., habitat of Cionus rossicus; 10 – southern steppes in the Kzyladyr karst area, habitat of Cionus gebleri; 11 – steppes of the low mountains of the Southern Urals near Kidryasovo village, habitat of Smicronyx albopictus; 12 – Kamennobrodsky chalk mountains in the southwest of the Volga Upland, habitat of Mecinus janthiniformis, Smicronyx robustus, and S. albopictus; 13 – Cretaceous outlier Kobyl'ya Golova in the Donskoy Nature Park, habitat of Mecinus janthiniformis.
Chalk Line
"Broad-axing began with a Chalk-Line as the log was bark-stripped to the brown under-bark and "twanged" with a Squaring Cord." -[Eric Sloane](https://en.wikipedia.org/wiki/Eric_Sloane), [*Museum of Early American Tools*](https://www.amazon.com/Museum-Early-American-Tools-Americana/dp/0486425606/ref=sr_1_1?crid=1MDB8783EQVPS&dchild=1&keywords=museum+of+early+american+tools&qid=1613590281&s=books&sprefix=museum+of+early%2Cstripbooks%2C170&sr=1-1) Modeled from Eric Sloane's [*Museum of Early American Tools*](https://www.amazon.com/Museum-Early-American-Tools-Americana/dp/0486425606/ref=sr_1_1?crid=1MDB8783EQVPS&dchild=1&keywords=museum+of+early+american+tools&qid=1613590281&s=books&sprefix=museum+of+early%2Cstripbooks%2C170&sr=1-1). Textured with [CC0 Textures](https://cc0textures.com) assets. Made with [Blender](https://blender.org). Source: Objaverse 1.0 / Sketchfab
Chalk Barge Bed Rotherhithe
The remains of a chalk barge bed on the Thames foreshore, below 'Charles Hay & Son' Rotherhithe, London. Date: 18th Century. Chalk beds were used as soft material for ships/boats to lay on when docked at low tide. The chalk stops the underside of the boat from being damaged by the foreshore. This one lies under a later layer of hard material which is being eroded to reveal the chalk beneath. Amongst the chalk and nearby are large quantities of discarded ship nails and other metal work. 167 photos taken in February 2020 with a Sony a6000 and processed in Reality Capture. Source: Objaverse 1.0 / Sketchfab
Data from: Improving governance outcomes for water quality: insights from participatory social network analysis for chalk stream catchments in England
<p>Globally important chalk streams in England are in poor ecological health, in part due to inadequate water quality. Addressing this issue requires an understanding of the governance systems that surround water quality. The complexity and uncertainty inherent in hydrological systems has led to the emergence of integrated and adaptive forms of governance. In these multi-actor governance systems, the structure of the relationships between actors (the social network) has been shown to affect governance processes and outcomes.</p> <p>Using participatory social network analysis, we mapped and analysed the social networks for the River Test and River Itchen in Hampshire, UK, to identify actors and their roles, determine the network characteristics, and identify interventions to improve governance.</p> <p>Although the results suggest a well connected network of actors from the state, private sector and civil society, we find that decision making is not decentralised. Bureaucratic governance by central state actors dominates. However, trust in these central state actors and private actors in the networks is low, which undermines collaboration and co-ordination in the network.</p> <p>Devolving authority to local actors, building trust in the networks, and improving connections to important actors could help to improve governance outcomes for water quality.</p>
Data from: Improving governance outcomes for water quality: insights from participatory social network analysis for chalk stream catchments in England
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Chalk weight, from Tresness, Sanday, Orkney
**Chalk weight, from Tresness, Sanday, OM.2018.55.2** This fishing net or basket weight was found after a storm, and is in the collections at The Orkney Museum, see http://bit.ly/2HrKfjp It's made from chalk, found in the local till of boulders, rocks and beach pebbles; rocks eroded from deposits outside Orkney. This type of weight was common in medieval times, but similar examples can be dated to other periods too. The suspension hole has been drilled from both sides creating an hour-glass profile. Its dimensions are: Base: 54 x 38mm. Height: 61mm. It was found with this spindle whorl http://bit.ly/2CqSNTA Find out more about where they were found at http://bit.ly/2Oe3Yny This is part of the "New Connections" Virtual Museum, funded by Museums Galleries Scotland and the Hugh Fraser Foundation, see irc.hw.ac.uk/new-connections.html Source: Objaverse 1.0 / Sketchfab
Nitrate trend reversal in Dutch dual-permeability chalk springs, evaluated by tritium-based groundwater travel time distributions [Data set]
<p>Data set covering measured nitrate and sulfate data of 90 springs, the tritium and nitrate input data for the convolution models and the age distributions metrics for the base case model and the stringent denitrification model, which were described in the publication in Science of the Total Environment (2024); doi: <em>10.1016/j.scitotenv.2024.175250</em></p>
The distribution of climbing chalk on climbed boulders and its impact on rock-dwelling fern and moss species
<p>Rock climbing is popular and the number of climbers rises worldwide. Numerous studies on the impact of climbing on rock-dwelling plants have reported negative effects, which were mainly attributed to mechanical disturbances such as trampling and removal of soil and vegetation. However, climbers also use climbing chalk (magnesium carbonate hydroxide) whose potential chemical effects on rock-dwelling species have not been assessed so far. Climbing chalk is expected to alter the pH and nutrient conditions on rocks, which may affect rock-dwelling organisms. We elucidated two fundamental aspects of climbing chalk:</p> <ol> <li>Its distribution along non-overhanging climbing routes was measured on regularly spaced raster points on gneiss boulders used for bouldering (ropeless climbing at low height). These measurements revealed elevated climbing chalk levels even on 65% of sampling points without any visual traces of climbing chalk.</li> <li>The impact of climbing chalk on rock-dwelling plants was assessed with four fern and four moss species in an experimental set-up in a climate chamber.</li> </ol> <p>The experiment showed significant negative, though varied effects of elevated climbing chalk concentrations on the germination and survival of both ferns and mosses. The study thus suggests that along climbing routes elevated climbing chalk concentration can occur even were no chalk traces are visible and that climbing chalk can have negative impacts on rock-dwelling organisms.</p>
The distribution of climbing chalk on climbed boulders and its impact on rock-dwelling fern and moss species
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). com (III TABLE in Nematodes From an English Chalk Grassland: Species Distributions
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Water infiltration monitoring in chalks through time-lapse GPR
<p>These time-lapse GPR measurement data are used to investigate the water flow in near surface chalks.</p>
Drinking Fountain Chalk Farm
A drinking fountain at the junction of Regents Park Road and Haverstock Hill, Chalk Farm, London. Date: 1882 http://www.mdfcta.co.uk/details-f/f059.html 167 photos taken in November 2020 with a Sony a6000 and processed in Reality Capture. Source: Objaverse 1.0 / Sketchfab
Laser microdissection-based tissue specific transcriptome analyses reveals novel regulatory network of genes involved in heat-induced grain chalk in rice endosperm.
GEO Series GSE122115. Oryza sativa. 24 samples. Type: Expression profiling by array.
Prediction of chalk porosity and water saturation by combining seismic and GPR data
<p>We predict porosity and water saturation of chalk by combining seismic and GPR data.</p>
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