Crystal Composition and Afterglow in Mixed Silicates: The Role of Melting Temperature

2015 ◽  
Vol 4 (2) ◽  
Author(s):  
O. Sidletskiy ◽  
A. Vedda ◽  
M. Fasoli ◽  
S. Neicheva ◽  
A. Gektin
Keyword(s):  
Melting Temperature ◽  
Crystal Composition

scholarly journals The interaction of spermine and pentamines with DNA

1987 ◽  
Vol 244 (1) ◽  
pp. 243-246 ◽  
Author(s):  
H S Basu ◽  
L J Marton
Keyword(s):  
High Temperature ◽  
Melting Temperature ◽  
Conformational Changes ◽  
Thermus Thermophilus ◽  
Total Charge ◽  
Amino Groups ◽  
Carbon Chains ◽  
Naturally Occurring ◽  
Calf Thymus

We studied the effects of spermine, two naturally-occurring pentamines isolated from the thermophile Thermus thermophilus and one synthetic pentamine on the aggregation and ‘melting’ temperature of calf-thymus DNA and on the B-to-Z transition of poly(dG-me5dC). All pentamines caused aggregation of DNA at much lower concentrations than that of spermine. Concentrations that increased the melting temperature of DNA and induced the B-to-Z transition in poly(dG-me5dC) were different for each pentamine, but were comparable with the concentration of spermine needed to cause these effects. Our results suggest that both the total charge and the distance separating the charge, which is a function of the length of the carbon chains between amino groups, are important for the induction of conformational changes in DNA. The biological role of pentamines in T. thermophilus appears to be related to their ability to promote DNA condensation at high temperature.

scholarly journals Effect of 1,4-Naphthalenedicarboxylic Acid Derivative on Crystallization and Performances of Poly(L-lactide)

2021 ◽  
Vol 58 (1) ◽  
pp. 57-68
Author(s):  
Lisha Zhao ◽  
Jun Qiao ◽  
Xueling Shan ◽  
Yanhua Cai ◽  
Jie Zhang
Keyword(s):  
Thermal Decomposition ◽  
Melting Temperature ◽  
Crystallization Temperature ◽  
Crystallization Rate ◽  
Decomposition Temperature ◽  
Organic Additive ◽  
Onset Crystallization Temperature ◽  
Nucleation Sites ◽  
Biodegradable Poly

In this work, biodegradable Poly(L-lactide) (PLLA) was modified through adding a new organic additive N, N -bis(benzoyl) 1, 4-naphthalenedicarboxylic acid dihydrazide (NABH). A comparison on crystallization of the pure PLLA and PLLA/NABH revealed that the NABH as effective heterogeneous nucleation sites enhanced PLLA𠏋 crystallization, and an increase of NABH loading was able to further accelerate crystallization rate of PLLA; whereas a faster cooling rate was not conducive to PLLA𠏋 crystallization, but the appearance of obvious crystallization peak upon cooling at 30şC/min confirmed the advanced enhancing role of NABH for PLLA crystallization again. The investigation on influence of the final melting temperature on the crystallization behavior of PLLA showed that the 170 şC was optimum final melting temperature for enhancing crystallization, even the onset crystallization temperature of PLLA/NABH were higher than 150şC. The melting processes of PLLA/NABH after different crystallization not only could reflect the previous crystallization, but also depended on crystallization temperature and heating rate. Thermal decomposition results showed that the existence of NABH slightly weakened thermal stability of PLLA, and the maximum difference in onset thermal decomposition temperature was only 9.4şC comparing with the pure PLLA. However, the presence of NABH in PLLA matrix seriously weakened optical property.

Tin in granitic melts: The role of melting temperature and protolith composition

Lithos ◽  
2018 ◽  
Vol 310-311 ◽  
pp. 20-30 ◽  
Author(s):  
Mathias Wolf ◽  
Rolf L. Romer ◽  
Leander Franz ◽  
Francisco Javier López-Moro
Keyword(s):  
Melting Temperature

scholarly journals Role of amount of council and diameter of copper on metal smelting temperature

2021 ◽  
Vol 9 (3) ◽  
pp. 339-341
Keyword(s):  
Melting Temperature ◽  
Copper Wire ◽  
Wire Diameter ◽  
Average Value ◽  
Average Temperature ◽  
Metal Smelter ◽  
Metal Melting

This paper discusses the role of the number of turns and the diameter of copper wire on metal melting temperature. The aim is to determine the effect of the number of turns and wire diameter on the temperature produced in the metal smelter. The method used by testing using the number of turns referred to is 20 turns, 25 turns, 30 turns, and a wire diameter of 1 mm, 1.5 mm and 2 mm. The results of the average value of the number of turns that vary, where the number of turns (30) has the highest average temperature value of 681.11 ° C, while the number of turns (25) produces the lowest average temperature of 648.22 ° C, the number of turns (20) the averagetemperature value is 651.11 ° C. and the larger the coil wire diameter is used, the higher the temperature produced. At 2mm, the coil wire diameter has the highest average temperature value of 691.11 ° C, while the coil wire diameter of 1.5mm has the highest average temperature value of 691.11 ° C. The average temperature value is 667.22 ° C, then the coil wire diameter of 1 mm has the lowest average value of 622.11 ° C

scholarly journals The Role of Phonons in Stability of Metallic Nanoparticles

2020 ◽  
Vol 15 (2) ◽  
Author(s):  
Vladimir L. Orlov ◽  
Aleksey V. Orlov
Keyword(s):  
Melting Temperature ◽  
Hollow Sphere ◽  
Metallic Nanoparticles ◽  
Elastic State ◽  
Metallic Nanoparticle ◽  
Novel Model

A novel model of a metallic nanoparticle is proposed. The model represents the nanoparticle as a hollow sphere. The existence of a nanohollow inside a particle is related to the behavior of phonons. The strain in the walls of a particle when it's heated is calculated utilizing the theory of a thick-walled shell. We show that in the transition to the elastic state, the expansion strains at the surface of a nanoparticle become sufficient for melting. The dependency of melting temperature on the size of a nanoparticle is discussed.

Mantle Plume – Spreading Ridge Interaction: A Comparative Study of the Red Sea and Reykjanes Ridges

2020 ◽  
Author(s):  
Zachary Molitor ◽  
Oliver Jagoutz ◽  
Leigh Royden ◽  
Stephanie Brown ◽  
Guido Port ◽  
...  
Keyword(s):  
Melting Temperature ◽  
Red Sea ◽  
Dynamic Pressure ◽  
Spreading Ridge ◽  
Mantle Plumes ◽  
Reykjanes Ridge ◽  
Mid Ocean Ridge ◽  
Mantle Temperature ◽  
Ocean Ridge

<p>As a young, mid ocean ridge, the Red Sea is a unique natural laboratory for studying the processes that drive continental rifting and breakup. The role of hot spots, frequently attributed to mantle plumes, in triggering or driving breakup and their impact on crustal structure and topography is not well understood. We have found that the Red Sea ridge bears a resemblance to the Reykjanes ridge in terms of bathymetry, morphology, geophysical properties, basalt chemistry, and modelled melting temperature and pressure of primary basalts. The results of modelling basalt melting temperature call into question the role of mantle temperature on generating excess melt beneath the Red Sea and Reykjanes ridges. Within 300 kilometers of a hotspot center, determined by seismic tomography, mantle excess temperatures are as high as 300 degrees relative to an ambient mantle temperature of about 1300 C. Outside of this radius excess temperatures are not significant (less than 50 C), and unlikely to cause significant melting anomalies. It is likely that the southern Red Sea and northern Reykjanes ridge are directly affected by hot, buoyant upwelling from the Afar and Iceland mantle plumes, and the central Red Sea and southern Reykjanes ridge may be affected by dynamic pressure related to actively upwelling mantle around the mantle plumes.</p>

Role of melting temperature in intermixing of miscible metal/metal bilayers induced by swift heavy ions

2011 ◽  
Vol 166 (8-9) ◽  
pp. 689-695 ◽  
Author(s):  
A. Gupta ◽  
R. S. Chauhan ◽  
D. C. Agarwal ◽  
S. Kumar ◽  
S. A. Khan ◽  
...  
Keyword(s):  
Melting Temperature ◽  
Heavy Ions ◽  
Swift Heavy Ions ◽  
Metal Metal ◽  
Metal Bilayers

Role of dactinomycin in the improved survival of children with Wilms' tumor

JAMA ◽  
1966 ◽  
Vol 195 (12) ◽  
pp. 1005-1009 ◽  
Author(s):  
D. J. Fernbach
Keyword(s):  
Wilms Tumor
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