Audubon's famous banding experiment: fact or fiction?

2018 ◽  
Vol 45 (1) ◽  
pp. 118-121 ◽  
Author(s):  
Matthew R. Halley

John James Audubon has been hailed as the progenitor of bird banding in America, but the high rate of natal philopatry in banded Eastern Phoebes (Sayornis phoebe) that he reported is an outlier when compared to modern data. More troubling, a reconstruction of the timeline of events with multiple independent primary sources, shows that Audubon was not in Pennsylvania when he claimed to have re-sighted two banded phoebes there in 1805. These facts cast doubt on the veracity of his story.

2021 ◽  
Vol 9 (4) ◽  
pp. 684-714
Author(s):  
Оtkirbay Agatay ◽  

Research objectives: This article discusses Joči’s military-political role and status in the Mongol Empire (Yeke Mongol Ulus), beginning in the early thirteenth century and within the intra-dynastic relations of Činggis Khan’s chief sons. In particular, the article seeks to answer questions about Joči’s birth. Discrepancies between the Secret History of the Mongols and other written sources cast doubt on whether Joči was even a legitimate son of Činggis Khan, let alone his eldest one. In addition, this article includes an analysis of Joči’s place within the family and the traditional legal system of the medieval Mongols based on the principles of majorat succession outlined in the Mongol Empire. It establishes evidence of his legitimacy within the Činggisid dynasty’s imperial lineage (altan uruġ) – a point of view supported by his military-political career, his pivotal role in the western campaigns, his leadership at the siege of Khwārazm, and the process of division of the ulus of Činggis Khan. Research materials: This article makes use of Russian, English, and Turkic (Kazakh, Tatar, etc.) translations of key primary sources including the Secret History of the Mongols and works of authors from the thirteenth to seventeenth centuries, including Al-Nasawī, Shіhāb al-Dīn al-Nuwayrī, ‘Alā’ al-Dīn ’Aṭā-Malik Juvāynī, Minhāj al-Dīn Jūzjānī, Zhao Hong, Peng Daya, John of Plano Carpini, William of Rubruck, Jamāl al-Qarshī, Rashīd al-Dīn, Ibn Faḍl Allāh al-ʿUmarī, Uluġbeg, Ötämiš Hājī, Lubsan Danzan, Abu’l-Ghāzī, and Saγang Sečen. New secondary works regarding Joči published by modern Kazakh, Russian, Tatar, American, French, Chinese, Korean and other scholars were also consulted. Results and novelty of the research: Taking into consideration certain economic and legal traits of the medieval Mongols, their traditional practices, military-political events, and longterm developments in the Mongol Empire’s history, descriptions of Joči being no more than a “Merkit bastard” are clearly not consistent. The persisting claims can be traced to doubts about Joči’s birth included in the Secret History of the Mongols, the first extensive written record of the medieval Mongols which had a great impact on the work of later historians, including modern scholars. Some researchers suspect this allegation may have been an indirect result of Möngke Khan inserting it into the Secret History. This article argues that the main motivation was Batu’s high military-political position and prestige in the Yeke Mongol Ulus. After Ögödei Khan’s death, sons and grandsons of Ögödei and Ča’adai made various attempts to erode Batu’s significant position in the altan uruġ by raising questions regarding his genealogical origin. This explains why doubts about Joči’s status in the imperial lineage appeared so widely following his death in an intra-dynastic propaganda struggle waged between the houses of Joči and Тolui and the opposing houses of Ča’adai and Ögödei’s sons. This conflict over the narrative was engendered by the struggle for supreme power in the Mongol Empire and the distribution of conquered lands and property.


2020 ◽  
Vol 14 (4) ◽  
pp. 7589-7599
Author(s):  
C. S. Ho ◽  
M. K. Mohd Nor ◽  
M. A. Ab Rani ◽  
N. Ma'at ◽  
M. T. Hameed Sultan ◽  
...  

Aluminium alloys have been widely used in many applications, and its usage is increasing yearly due to its distinctive properties. Nevertheless, it required high energy consumption and pollution during the production of primary sources. This leads to the attention in producing secondary sources to substitute the primary aluminium. Recycling of aluminium alloys adopted in automotive structures is a great option to save thousands of energy and prevent tons of CO2 from being released to the atmosphere. Numerous investigations must be conducted to establish the mechanical behaviour before the specific applications can be identified. However, there is a challenge for such recycled aluminium to achieve the same application as the primary sources due to material properties degradation related to damage. It is still an open study area to be explored for a better understanding of the behaviours of recycled aluminium. Thus, in this work, the Taylor Cylinder Impact test is used to investigate anisotropic-damage behaviour of recycled aluminium alloy AA6061 undergoing high-velocity impact from 190m/s to 300 m/s using two length-to-diameter (L/D) ratios. The recovered samples are observed under an optical microscope (OM) and scanning electron microscope (SEM). A strong strain rate dependency can be seen as the damage evolution is increasing as the impact velocity increase. Further, the corresponding digitized footprints analysis exhibit plastic anisotropic and localized plastic strain in such recycled material. This can be clearly observed from the development of a non-symmetrical footprint within the impact surface. This test is the first to explore the deformation behaviour of recycled materials using high-velocity cylinder impact in a high rate of strain deformation regime.


Author(s):  
L. E. Murr ◽  
G. Wong

Palladium single-crystal films have been prepared by Matthews in ultra-high vacuum by evaporation onto (001) NaCl substrates cleaved in-situ, and maintained at ∼ 350° C. Murr has also produced large-grained and single-crystal Pd films by high-rate evaporation onto (001) NaCl air-cleaved substrates at 350°C. In the present work, very large (∼ 3cm2), continuous single-crystal films of Pd have been prepared by flash evaporation onto air-cleaved (001) NaCl substrates at temperatures at or below 250°C. Evaporation rates estimated to be ≧ 2000 Å/sec, were obtained by effectively short-circuiting 1 mil tungsten evaporation boats in a self-regulating system which maintained an optimum load current of approximately 90 amperes; corresponding to a current density through the boat of ∼ 4 × 104 amperes/cm2.


Author(s):  
A. Elgsaeter ◽  
T. Espevik ◽  
G. Kopstad

The importance of a high rate of temperature decrease (“rapid freezing”) when freezing specimens for freeze-etching has long been recognized1. The two basic methods for achieving rapid freezing are: 1) dropping the specimen onto a metal surface at low temperature, 2) bringing the specimen instantaneously into thermal contact with a liquid at low temperature and subsequently maintaining a high relative velocity between the liquid and the specimen. Over the last couple of years the first method has received strong renewed interest, particularily as the result of a series of important studies by Heuser and coworkers 2,3. In this paper we will compare these two freezing methods theoretically and experimentally.


2005 ◽  
Vol 38 (3) ◽  
pp. 8
Author(s):  
BRUCE JANCIN
Keyword(s):  

2001 ◽  
Author(s):  
Z. Steel ◽  
J. Jones ◽  
S Adcock ◽  
R Clancy ◽  
L. Bridgford-West ◽  
...  

1989 ◽  
Vol 136 (5) ◽  
pp. 405 ◽  
Author(s):  
J. Sun ◽  
I.S. Reed ◽  
H.E. Huey ◽  
T.K. Truong

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