scholarly journals Role of isostaticity and load-bearing microstructure in the elasticity of yielded colloidal gels

2012 ◽  
Vol 109 (40) ◽  
pp. 16029-16034 ◽  
Author(s):  
L. C. Hsiao ◽  
R. S. Newman ◽  
S. C. Glotzer ◽  
M. J. Solomon
Keyword(s):  
2017 ◽  
Vol 284 (1861) ◽  
pp. 20171174 ◽  
Author(s):  
Brianna K. McHorse ◽  
Andrew A. Biewener ◽  
Stephanie E. Pierce

Digit reduction is a major trend that characterizes horse evolution, but its causes and consequences have rarely been quantitatively tested. Using beam analysis on fossilized centre metapodials, we tested how locomotor bone stresses changed with digit reduction and increasing body size across the horse lineage. Internal bone geometry was captured from 13 fossil horse genera that covered the breadth of the equid phylogeny and the spectrum of digit reduction and body sizes, from Hyracotherium to Equus . To account for the load-bearing role of side digits, a novel, continuous measure of digit reduction was also established—toe reduction index (TRI). Our results show that without accounting for side digits, three-toed horses as late as Parahippus would have experienced physiologically untenable bone stresses. Conversely, when side digits are modelled as load-bearing, species at the base of the horse radiation through Equus probably maintained a similar safety factor to fracture stress. We conclude that the centre metapodial compensated for evolutionary digit reduction and body mass increases by becoming more resistant to bending through substantial positive allometry in internal geometry. These results lend support to two historical hypotheses: that increasing body mass selected for a single, robust metapodial rather than several smaller ones; and that, as horse limbs became elongated, the cost of inertia from the side toes outweighed their utility for stabilization or load-bearing.


Soft Matter ◽  
2016 ◽  
Vol 12 (46) ◽  
pp. 9303-9313 ◽  
Author(s):  
Ronja F. Capellmann ◽  
Néstor E. Valadez-Pérez ◽  
Benedikt Simon ◽  
Stefan U. Egelhaaf ◽  
Marco Laurati ◽  
...  

2007 ◽  
Vol 2007 (02) ◽  
pp. P02010-P02010 ◽  
Author(s):  
Jean-Michel Condre ◽  
Christian Ligoure ◽  
Luca Cipelletti

2001 ◽  
Vol 67 (1) ◽  
pp. 114-121 ◽  
Author(s):  
Peter Pregelj ◽  
Janez Sketelj

Author(s):  
D.S. Shevsky

The article justifies why the collapse of the Soviet Union should be analyzed as the intersection of a number of diverse processes and phenomena. According to the author, the existing discord within the discussion about the reasons for the collapse of the USSR can be largely explained by the fact that researchers are not trying to determine the essence of the phenomenon they are studying and to reveal the totality of its features. The lack of the reflection on what exactly the end of the existence of the USSR was and when it happened, leads to isolating individual components of the process. As a result, some authors associate the collapse of the USSR with the dire economic straits, others consider the rise of nationalism to be the main culprit, others emphasize the role of specific actors, etc. In order to determine what exactly the collapse of the USSR meant and when it happened, the author identifies the fundamental characteristics of the entity itself, dividing it into the USSR-system and the USSR-state, and traces how these characteristics changed. His research shows that the collapse of the USSR can be divided into at least two different, albeit related processes: the collapse of the system and the collapse of the state. The collapse of the system meant a change in a self-describing narrative, the most important elements of which were the discourse of the indisputable achievements of the 1917 October Revolution, the CPSU’s monopoly of power and its monolithic nature, confrontation with the capitalist countries and the socialist (state-owned) economy. It is the breakdown of these “load-bearing structures” that predetermined the future collapse of the state, making it possible for destructive factors to materialize in the form of a fiscal crisis, intra-elite conflict and mass mobilization.


Soft Matter ◽  
2014 ◽  
Vol 10 (46) ◽  
pp. 9254-9259 ◽  
Author(s):  
Lilian C. Hsiao ◽  
Heekyoung Kang ◽  
Kyung Hyun Ahn ◽  
Michael J. Solomon

RSC Advances ◽  
2016 ◽  
Vol 6 (92) ◽  
pp. 89467-89483 ◽  
Author(s):  
Sayantan Ray ◽  
Rituparna Acharya ◽  
Suman Saha ◽  
Amirul Islam ◽  
Sangeeta Dey ◽  
...  

This study demonstrates the material and biological properties of a unique osteogenic drug eluting (local) coating on load bearing SS316L implant material with a tunable release profile.


Sign in / Sign up

Export Citation Format

Share Document