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Author Topic: New developments in the field of science  (Read 211751 times)

T40cfr403

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Re: New developments in the field of science
« Reply #1650 on: April 04, 2018, 03:46:23 PM »
An article on Viking ship navigation referenced the ability of migratory birds to use polarized light for navigation.

Behavioural and physiological mechanisms of polarized light sensitivity in birds

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3049006/


The avian sun compass is time compensated and takes into consideration the movement of the Sun across the sky during the day. Animals using such a time-compensated sun compass need to compensate for the azimuthal change of the Sun over the day when determining their goal direction (dark arrow). The example shows three sun positions over a day (sunrise in pink, noon in yellow and sunset in orange) and the changing relationships (angles in respective colours) between sun position and the goal direction. In order to be able to determine this angle correctly, the animals needs to be able to precisely measure local time. gN, geographical north.
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T40cfr403

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Re: New developments in the field of science
« Reply #1651 on: April 06, 2018, 03:38:15 PM »
How birds "see" magnetic fields

https://www.zmescience.com/science/bird-magnetic-field-71351354/

Paper: Expression patterns of cryptochrome genes in avian retina suggest involvement of Cry4 in light-dependent magnetoreception

http://rsif.royalsocietypublishing.org/content/15/140/20180058

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T40cfr403

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Re: New developments in the field of science
« Reply #1652 on: April 06, 2018, 05:10:58 PM »
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Only within the moment of time represented by the present century has one species -- man -- acquired significant power to alter the nature of the world.
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T40cfr403

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Re: New developments in the field of science
« Reply #1653 on: April 06, 2018, 05:12:18 PM »
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Only within the moment of time represented by the present century has one species -- man -- acquired significant power to alter the nature of the world.
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T40cfr403

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Re: New developments in the field of science
« Reply #1654 on: April 06, 2018, 05:17:43 PM »
Personal outreach to landowners is vital to conservation program success

https://phys.org/news/2018-04-personal-outreach-landowners-vital-success.html

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Only within the moment of time represented by the present century has one species -- man -- acquired significant power to alter the nature of the world.
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T40cfr403

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Re: New developments in the field of science
« Reply #1655 on: April 06, 2018, 05:26:37 PM »
Pepco Holdings Employee Receives National Technology Award

"...research incorporated telemetry data of eagle flight paths with geographic information systems data and existing distribution and transmission lines. The analysis identified 78 new eagle roosts in the company's service territory and highlighted more than 20 line segments with potential risk of collision. Incorporating eagle telemetry provided new data to reduce eagle collision outages and improve system reliability while minimizing injury and mortality risk to eagles."

http://washingtoninformer.com/pepco-holdings-employee-receives-national-technology-award/

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T40cfr403

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Re: New developments in the field of science
« Reply #1656 on: April 07, 2018, 02:04:10 PM »
Climate change also threatens the survival of seabirds

https://www.sciencedaily.com/releases/2018/04/180405095844.htm?utm_source=feedburner&utm_medium=email&utm_campaign=Feed%3A+sciencedaily%2Fplants_animals%2Fbirds+%28Birds+News+--+ScienceDaily%29


This situation will be particularly harmful for the giant petrels, fulmars and albatrosses.
Credit: Jacob Gonz?lez-Sol?s, UB-IRBio
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Only within the moment of time represented by the present century has one species -- man -- acquired significant power to alter the nature of the world.
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T40cfr403

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Re: New developments in the field of science
« Reply #1657 on: April 07, 2018, 11:02:58 PM »
« Last Edit: April 07, 2018, 11:05:05 PM by T40cfr403 »
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T40cfr403

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Re: New developments in the field of science
« Reply #1658 on: April 13, 2018, 04:41:47 PM »
Cracking the mystery of egg shape (cool graphics)

http://vis.sciencemag.org/eggs/

Abstract: Avian egg shape: Form, function, and evolution

http://science.sciencemag.org/content/356/6344/1249

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Only within the moment of time represented by the present century has one species -- man -- acquired significant power to alter the nature of the world.
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T40cfr403

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Re: New developments in the field of science
« Reply #1659 on: April 13, 2018, 04:50:49 PM »
Peregrine falcons maneuver best when dive-bombing at more than 300 kilometers per hour (very interesting & with a video because, you know, math!)

http://www.sciencemag.org/news/2018/04/peregrine-falcons-maneuver-best-when-dive-bombing-more-300-kilometers-hour?utm_campaign=news_daily_2018-04-12&et_rid=213094054&et_cid=1969675

Paper: Physics-based simulations of aerial attacks by peregrine falcons reveal that stooping at high speed maximizes catch success against agile prey

http://journals.plos.org/ploscompbiol/article?id=10.1371/journal.pcbi.1006044


Flight performance graphs in the flight simulator for the peregrine falcon (dark blue) and the common starling (light blue).

The double arrows denote the direction of acceleration displayed in the graph. The starling is able to outmaneuver the falcon at a given airspeed, if there exists a region under the curve of the starling that is not overlapping with that of the falcon. (a) Level acceleration versus air speed: level flight with the requirement that lift equals weight. Dashed lines denote the speed wherein torque forces constrain the maximum acceleration (mechanical constraints). Top level flight speed is reached at the point where level acceleration is zero. (b) Vertical dive acceleration (including gravity) versus air speed. At the end of the dashed lines, flapping is substituted by gliding with retracted wings in order to maximize vertical acceleration. (c) Load factor versus air speed. The load factor is defined as lift divided by weight. The maximum load factor does not scale quadratically with forward speed due to constraints in torque forces [11]. Instead, wings are retracted optimally to increase maximum load. (d) Roll acceleration versus air speed. Roll acceleration determines the speed with which the bird can redirect its lift and is calculated by estimating the whole-body inertia around the roll-axis and the maximum net torque production [11]. (e) Turning radius is calculated as the square of air speed divided by the maximum normal acceleration.   
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Only within the moment of time represented by the present century has one species -- man -- acquired significant power to alter the nature of the world.
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T40cfr403

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Re: New developments in the field of science
« Reply #1660 on: April 18, 2018, 01:43:23 PM »
Quote from: T40cfr403 on April 13, 2018, 04:50:49 PM
Peregrine falcons maneuver best when dive-bombing at more than 300 kilometers per hour (very interesting & with a video because, you know, math!)

http://www.sciencemag.org/news/2018/04/peregrine-falcons-maneuver-best-when-dive-bombing-more-300-kilometers-hour?utm_campaign=news_daily_2018-04-12&et_rid=213094054&et_cid=1969675

Paper: Physics-based simulations of aerial attacks by peregrine falcons reveal that stooping at high speed maximizes catch success against agile prey

http://journals.plos.org/ploscompbiol/article?id=10.1371/journal.pcbi.1006044


Flight performance graphs in the flight simulator for the peregrine falcon (dark blue) and the common starling (light blue).

The double arrows denote the direction of acceleration displayed in the graph. The starling is able to outmaneuver the falcon at a given airspeed, if there exists a region under the curve of the starling that is not overlapping with that of the falcon. (a) Level acceleration versus air speed: level flight with the requirement that lift equals weight. Dashed lines denote the speed wherein torque forces constrain the maximum acceleration (mechanical constraints). Top level flight speed is reached at the point where level acceleration is zero. (b) Vertical dive acceleration (including gravity) versus air speed. At the end of the dashed lines, flapping is substituted by gliding with retracted wings in order to maximize vertical acceleration. (c) Load factor versus air speed. The load factor is defined as lift divided by weight. The maximum load factor does not scale quadratically with forward speed due to constraints in torque forces [11]. Instead, wings are retracted optimally to increase maximum load. (d) Roll acceleration versus air speed. Roll acceleration determines the speed with which the bird can redirect its lift and is calculated by estimating the whole-body inertia around the roll-axis and the maximum net torque production [11]. (e) Turning radius is calculated as the square of air speed divided by the maximum normal acceleration.

More: Falcons are as fast as racecars. Pity their poor prey. (flight simulator video)

https://www.washingtonpost.com/news/speaking-of-science/wp/2018/04/12/falcons-are-as-fast-as-racecars-pity-their-poor-prey/?utm_term=.75b2fd8f27b6&wpisrc=nl_science&wpmm=1

Extremely fast dives help peregrine falcons maneuver to catch agile prey

https://www.sciencedaily.com/releases/2018/04/180412141110.htm?utm_source=feedburner&utm_medium=email&utm_campaign=Feed%3A+sciencedaily%2Fplants_animals%2Fbirds+%28Birds+News+--+ScienceDaily%29




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T40cfr403

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Re: New developments in the field of science
« Reply #1661 on: April 19, 2018, 10:56:48 AM »
Papers and abstracts resulting from a conversation in chat about the role preen oil may play in sibling recognition.

Smells may help birds identify their relatives

https://news.uchicago.edu/article/2011/09/21/smells-may-help-birds-identify-their-relatives

Odor-Based Recognition of Familiar and Related Conspecifics: A First Test Conducted on Captive Humboldt Penguins (Spheniscus humboldti)

http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0025002

Preen oil and bird fitness: a critical review of the evidence

https://onlinelibrary.wiley.com/doi/full/10.1111/brv.12324

Uropygial gland volatiles facilitate species recognition between two sympatric sibling bird species

https://academic.oup.com/beheco/article/24/6/1271/189438

Preen secretions encode information on MHC similarity in certain sex-dyads in a monogamous seabird

https://www.nature.com/articles/srep06920

« Last Edit: April 19, 2018, 11:10:03 AM by T40cfr403 »
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Re: New developments in the field of science
« Reply #1662 on: April 25, 2018, 04:25:48 PM »
Article: Dinosaurs breathed like birds (from 2005)

https://www.nature.com/articles/nature03716

Paper: Basic avian pulmonary design and flow-through ventilation in non-avian theropod dinosaurs

https://sci-hub.hk/10.1038/nature03716

Related article: New Guineans carved human bones into 'formidable, fierce-looking and beautiful' daggers

https://www.washingtonpost.com/news/speaking-of-science/wp/2018/04/24/new-guineans-carved-human-bones-into-formidable-fierce-looking-and-beautiful-daggers/?utm_term=.fb85578fe3d3&wpisrc=nl_science&wpmm=1


Bone daggers from New Guinea, carved from human bone, above, and from the bone of a bird called a cassowary, below. (Nathaniel J. Dominy. ? Hood Museum of Art, Dartmouth College)


Small raptors had air-filled bones to help them sprint.
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Only within the moment of time represented by the present century has one species -- man -- acquired significant power to alter the nature of the world.
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T40cfr403

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Re: New developments in the field of science
« Reply #1663 on: May 05, 2018, 08:15:06 AM »
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Only within the moment of time represented by the present century has one species -- man -- acquired significant power to alter the nature of the world.
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T40cfr403

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Re: New developments in the field of science
« Reply #1664 on: May 09, 2018, 02:31:30 PM »
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Only within the moment of time represented by the present century has one species -- man -- acquired significant power to alter the nature of the world.
― Rachel Carson, Silent Spring