Elevated Temperature Affects Phenotypic Plasticity in the Bull Kelp ( Nereocystis luetkeana , Phaeophyceae)

2020 ◽  
Vol 56 (6) ◽  
pp. 1534-1541
Author(s):  
Varoon P. Supratya ◽  
Liam J.M. Coleman ◽  
Patrick T. Martone
Keyword(s):  
Elevated Temperature ◽  
Phenotypic Plasticity ◽  
Nereocystis Luetkeana

Evidence for a shear mechanism for the precipitation of γ-zirconium hydride in zirconium

1978 ◽  
Vol 36 (1) ◽  
pp. 658-659
Author(s):  
G.J.C. Carpenter
Keyword(s):  
Elevated Temperature ◽  
Strain Field ◽  
Zirconium Hydride ◽  
Zirconium Atom ◽  
Atom Diffusion ◽  
Solvus Temperature ◽  
Hexagonal Close Packed ◽  
Partial Dislocations ◽  
The Face

In zirconium-hydrogen alloys, rapid cooling from an elevated temperature causes precipitation of the face-centred tetragonal (fct) phase, γZrH, in the form of needles, parallel to the close-packed <1120>zr directions (1). With low hydrogen concentrations, the hydride solvus is sufficiently low that zirconium atom diffusion cannot occur. For example, with 6 μg/g hydrogen, the solvus temperature is approximately 370 K (2), at which only the hydrogen diffuses readily. Shears are therefore necessary to produce the crystallographic transformation from hexagonal close-packed (hep) zirconium to fct hydride.The simplest mechanism for the transformation is the passage of Shockley partial dislocations having Burgers vectors (b) of the type 1/3<0110> on every second (0001)Zr plane. If the partial dislocations are in the form of loops with the same b, the crosssection of a hydride precipitate will be as shown in fig.1. A consequence of this type of transformation is that a cumulative shear, S, is produced that leads to a strain field in the surrounding zirconium matrix, as illustrated in fig.2a.

Microstructural characterization of a rapidly solidified Al-Fe-V-Si alloy for elevated temperature applications

1988 ◽  
Vol 46 ◽  
pp. 550-551
Author(s):  
R. E. Franck ◽  
J. A. Hawk ◽  
G. J. Shiflet
Keyword(s):  
High Temperature ◽  
Elevated Temperature ◽  
Grain Growth ◽  
Volume Fraction ◽  
Microstructural Characterization ◽  
Second Phase ◽  
Microstructural Stability ◽  
Elevated Temperature Strength ◽  
Temperature Applications

Rapid solidification processing (RSP) is one method of producing high strength aluminum alloys for elevated temperature applications. Allied-Signal, Inc. has produced an Al-12.4 Fe-1.2 V-2.3 Si (composition in wt pct) alloy which possesses good microstructural stability up to 425°C. This alloy contains a high volume fraction (37 v/o) of fine nearly spherical, α-Al12(Fe, V)3Si dispersoids. The improved elevated temperature strength and stability of this alloy is due to the slower dispersoid coarsening rate of the silicide particles. Additionally, the high v/o of second phase particles should inhibit recrystallization and grain growth, and thus reduce any loss in strength due to long term, high temperature annealing.The focus of this research is to investigate microstructural changes induced by long term, high temperature static annealing heat-treatments. Annealing treatments for up to 1000 hours were carried out on this alloy at 500°C, 550°C and 600°C. Particle coarsening and/or recrystallization and grain growth would be accelerated in these temperature regimes.

Ecology and biogeography in the introduction to “De bestiis marinis” by Georg Wilhelm Steller

2019 ◽  
Vol 46 (1) ◽  
pp. 63-74
Author(s):  
Stefano Mattioli
Keyword(s):  
Body Size ◽  
Phenotypic Plasticity ◽  
Geographical Distribution ◽  
Functional Traits ◽  
Marine Mammals ◽  
Main Part ◽  
Wide Distribution ◽  
Restricted Range ◽  
Direct Influence ◽  
Modern Biology

The rediscovery of the original, unedited Latin manuscript of Georg Wilhelm Steller's “De bestiis marinis” (“On marine mammals”), first published in 1751, calls for a new translation into English. The main part of the treatise contains detailed descriptions of four marine mammals, but the introduction is devoted to more general issues, including innovative speculation on morphology, ecology and biogeography, anticipating arguments and concepts of modern biology. Steller noted early that climate and food have a direct influence on body size, pelage and functional traits of mammals, potentially affecting reversible changes (phenotypic plasticity). Feeding and other behavioural habits have an impact on the geographical distribution of mammals. Species with a broad diet tend to have a wide distribution, whereas animals with a narrow diet more likely have only a restricted range. According to Steller, both sea and land then still concealed countless animals unknown to science.

Growth and Physiological Characteristics of Abies koreana, Pinus densiflora, Quercus serrata Seedlings under Elevated Temperature and CO2 Concentration

2020 ◽  
Vol 11 (1) ◽  
pp. 1-9
Author(s):  
Woo Kyung Song ◽  
Go Eun Park ◽  
Sun Mi Je ◽  
Sun Hee Kim ◽  
Jong-Hwan Lim
Keyword(s):  
Elevated Temperature ◽  
Pinus Densiflora ◽  
Co2 Concentration ◽  
Quercus Serrata ◽  
Physiological Characteristics ◽  
Abies Koreana

An uncoupled viscoplastic constitutive model for metals at elevated temperature

1983 ◽  
Author(s):  
W. HAISLER ◽  
J. CRONENWORTH
Keyword(s):  
Elevated Temperature ◽  
Constitutive Model

Evaluation of creep crack growth criteria in IN-100 at elevated temperature

1981 ◽  
Author(s):  
T. HINNERICHS ◽  
A. PALAZOTTO ◽  
T. NICHOLAS
Keyword(s):  
Elevated Temperature ◽  
Crack Growth ◽  
Creep Crack Growth ◽  
Creep Crack

Pulse Velocity Behaviour of glass fibre self compacting concrete at Elevated Temperature

2010 ◽  
Vol 6 (1) ◽  
pp. 40-43
Author(s):  
T. Seshadri Sekhar ◽  
◽  
P. Sravana ◽  
P. Srinivasa Rao ◽  
◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Glass Fibre ◽  
Pulse Velocity ◽  
Self Compacting Concrete

A Finite Element (FE) simulation of naked solid steel beam at elevated temperature

2018 ◽  
Vol 10 (9) ◽  
Author(s):  
Fariz Aswan Ahmad Zakwan ◽  
◽  
Renga Rao Krishnamoorthy ◽  
Azmi Ibrahim ◽  
Ruqayyah Ismail ◽  
...  
Keyword(s):  
Finite Element ◽  
Elevated Temperature ◽  
Fe Simulation ◽  
Steel Beam
Sign in / Sign up

Export Citation Format

Share Document