Existence of two stages in amplitude-dependent attenuation of ultrasonic waves in metallic glasses at low temperatures

1982 ◽  
Vol 49 (3-4) ◽  
pp. 341-346 ◽  
Author(s):  
A. Hikata ◽  
G. Cibuzar ◽  
C. Elbaum
Keyword(s):  
Metallic Glasses ◽  
Low Temperatures ◽  
Ultrasonic Waves ◽  
Two Stages

ULTRASONIC STUDIES OF METALLIC GLASSES AT LOW TEMPERATURES

1981 ◽  
Vol 42 (C5) ◽  
pp. C5-517-C5-521
Author(s):  
G. Park ◽  
A. Hikata ◽  
C. Elbaum
Keyword(s):  
Metallic Glasses ◽  
Low Temperatures

scholarly journals Dual-stage sugar substitution in Tommy Atkins mango

2019 ◽  
Vol 23 (1) ◽  
pp. 60-64
Author(s):  
Rafael A. B. de Medeiros ◽  
Zilmar M. P. Barros ◽  
Carlos B. O. de Carvalho ◽  
Antonio C. D. Coêlho ◽  
Maria I. S. Maciel ◽  
...  
Keyword(s):  
Quality Parameters ◽  
Ultrasonic Waves ◽  
Total Phenolic ◽  
Second Stage ◽  
Study Results ◽  
Fruit Samples ◽  
Dual Stage ◽  
Sugar Replacement ◽  
Two Stages ◽  
High Calorie

ABSTRACT The dual-stage sugar substitution technique (D3S) was used to induce sugar replacement in mango. It involved two stages, in which high-calorie sugars were partially removed from the fruit samples in the first stage and, in the second one, low-calorie sugar was incorporated into the mango. Ultrasonic waves can be applied in one or both stages and their use was also evaluated in this study. Results showed that submitting samples to ultrasonic waves (25 kHz) in both stages and their immersion in Stevia-based solution (250 or 500 g kg-1) in the second stage for 10, 20 and 30 min of processing gave higher water loss during the process, while greater solids gain could be achieved by applying ultrasound only in the first stage. Samples were also evaluated in terms of some quality parameters. The use of this technique resulted in samples with higher values of total phenolic content and changes in color parameters (L*, a* and b*). When samples were subjected to ultrasonic waves in both stages, a higher carotenoid retention was observed.

scholarly journals Decapodid and early juvenile development in the protandrous shrimp Campylonotus vagans (Crustacea: Decapoda: Caridea), with notes on larval morphology

2003 ◽  
Vol 83 (1) ◽  
pp. 103-109 ◽  
Author(s):  
Sven Thatje ◽  
Gustavo A. Lovrich
Keyword(s):  
Low Temperatures ◽  
Juvenile Stage ◽  
Tierra Del Fuego ◽  
Caridean Shrimp ◽  
Early Juvenile ◽  
Morphological Variations ◽  
Sexual Determination ◽  
Juvenile Stages ◽  
Two Stages ◽  
Juvenile Development

The decapodid and first two juvenile stages of the caridean shrimp Campylonotus vagans from the Subantarctic Beagle Channel (Tierra del Fuego, Argentina) are described and illustrated in detail. The complete larval and early juvenile development of this species from rearings under controlled laboratory conditions were analysed. Zoeal morphology in two stages of an abbreviated development was identical to a description from plankton and hatched larvae of a previous work, and therefore we only compare and discuss slight morphological variations in this study. The first juvenile is large and already resembles some features of adults, lacking all ventral rostral and the fourth dorsal rostral spine only which appears in the following stage, and the second pereiopod not yet being as predominant as in adults. Sexual determination is not yet possible up to the described second juvenile stage. The abbreviated larval development in a Subantarctic shrimp species is discussed as an adaptation to low temperatures and pronounced seasonality.

Attenuation of longitudinal ultrasonic waves in aluminium at low temperatures

Physica ◽  
1962 ◽  
Vol 28 (4) ◽  
pp. 330-342 ◽  
Author(s):  
R. David ◽  
H.R. van der Laan ◽  
N.J. Poulis
Keyword(s):  
Low Temperatures ◽  
Ultrasonic Waves ◽  
Longitudinal Ultrasonic Waves

Some titanium germanium and silicon compounds: Reaction and properties

1990 ◽  
Vol 5 (7) ◽  
pp. 1453-1462 ◽  
Author(s):  
O. Thomas ◽  
F. M. d'Heurle ◽  
S. Delage
Keyword(s):  
Significant Role ◽  
Low Temperatures ◽  
Metal Substrate ◽  
Reaction Behavior ◽  
Silicon Compounds ◽  
Alloy Scattering ◽  
Diffusion Controlled ◽  
Two Stages ◽  
Diffusion Controlled Reaction

Titanium reacts with pure Ge in two different ways: At low temperatures one observes the formation of Ti6Ge5 with some characteristics typical of diffusion-controlled reaction. Upon completion of this first stage Ti6Ge5 reacts with remaining Ge to form TiGe2, isomorphous with C54 TiSi2, in a process which is clearly controlled by nucleation. The same observations apply to reactions with a Ge alloy containing 25 at.% Si. With an alloy containing 50 at.% Si the two stages become merged, so that while remaining identifiable, they are much less distinct than with the previous conditions. The reaction behavior observed with a Ge alloy containing 80 at.% Si resembles that generally obtained with pure Si: there are no easily identifiable steps between the initial Si–Ti sample and the final one, Si–TiSi2. With both the 50-50 and 80-20 Si–Ge alloys the formation of the C54 structure is preceded by that of the C49 structure (ZrSi2 type), as with pure Si. The gradual merging of the diffusion-controlled reaction and that controlled by nucleation as the concentration of Si in the substrate increases implies that nucleation plays a significant role in the formation of TiSi2, even if that role cannot be easily isolated. Effects due to gas impurities on the path of the metal-substrate reaction have been analyzed. The resistivities of several pure and alloyed phases have been measured. Alloy scattering in the system TiSi2–TiGe2 is briefly discussed.

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