Effect of temperature conditions for failure on the structure and properties of steel 12Kh18N10T and alloy D16T

1983 ◽  
Vol 25 (5) ◽  
pp. 377-380
Author(s):  
B. P. Kuz'michev ◽  
L. P. Kryuchkov ◽  
R. Yu. Tsimberova
Keyword(s):  
Effect Of Temperature ◽  
Steel 12Kh18n10t ◽  
Structure And Properties ◽  
Alloy D16t ◽  
Temperature Conditions

scholarly journals Effect of Temperature Conditions on Flame Evolutions of Turbulent Jet Ignition

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2226
Author(s):  
Jiaying Pan ◽  
Yu He ◽  
Tao Li ◽  
Haiqiao Wei ◽  
Lei Wang ◽  
...  
Keyword(s):  
Flame Propagation ◽  
Early Stage ◽  
Turbulent Jet ◽  
Combustion Stability ◽  
Effect Of Temperature ◽  
Main Chamber ◽  
Detailed Chemical Kinetics ◽  
Jet Flame ◽  
Spherical Flame ◽  
Temperature Conditions

Turbulent jet ignition technology can significantly improve lean combustion stability and suppress engine knocking. However, the narrow jet channel between the pre-chamber and the main chamber leads to some difficulties in heat exchange, which significantly affects combustion performance and mechanical component lifetime. To clarify the effect of temperature conditions on combustion evolutions of turbulent jet ignition, direct numerical simulations with detailed chemical kinetics were employed under engine-relevant conditions. The flame propagation in the pre-chamber and the early-stage turbulent jet ignition in the main chamber were investigated. The results show that depending on temperature conditions, two types of flame configuration can be identified in the main chamber, i.e., the normal turbulent jet flame propagation and the spherical flame propagation, and the latter is closely associated with pressure wave disturbance. Under low-temperature conditions, the cold jet stoichiometric mixtures and the vortexes induced by the jet flow determine the early-stage flame development in the main chamber. Under intermediate temperature conditions, pre-flame heat release and leading pressure waves are induced in the jet channel, which can be regarded as a transition of different combustion modes. Whereas under high-temperature conditions, irregular auto-ignition events start to occur, and spherical flame fronts are induced in the main chamber, behaving faster flame propagation.

High-Pressure Synthesis, Crystal Structure, and Properties of the New Orthorhombic Rare-Earth meta-Oxoborates RE(BO2)3 (RE = Dy – Lu)

2004 ◽  
Vol 59 (2) ◽  
pp. 202-215 ◽  
Author(s):  
Holger Emme ◽  
Tanja Nikelski ◽  
Thomas Schleid ◽  
Rainer Pöttgen ◽  
Manfred Heinrich Möller ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Ambient Pressure ◽  
Structure And Properties ◽  
Crystal Data ◽  
Temperature Conditions ◽  
Pressure Synthesis ◽  
Ir Spectroscopic ◽  
Pressure Phase

The new orthorhombic meta-oxoborates RE(BO2)3 (≡REB3O6) (RE = Dy-Lu) have been synthesized under high-pressure and high-temperature conditions in a Walker-type multianvil apparatus at 7.5 GPa and 1100 °C. They are isotypic to the known ambient pressure phase Tb(BO2)3, space group Pnma. In contrast to Dy(BO2)3, which was also obtained in small amounts under high-temperature conditions, the preparation of the higher orthorhombic homologues RE(BO2)3 (RE = Ho-Lu) was only possible using high-pressure. The meta-oxoborates RE(BO2)3 (RE = Dy-Er) were synthesized as pure products, whereas the orthorhombic phases with RE = Tm-Lu were only obtained as byproducts. With the exception of Yb(BO2)3 it was possible to establish single crystal data for all compounds. The results of temperature-resolved in-situ powder-diffraction measurements, DTA, IR-spectroscopic investigations, and magnetic properties are also presented.

Temperature Reception and Responses in Fish

1954 ◽  
Vol 11 (2) ◽  
pp. 153-170 ◽  
Author(s):  
Charlotte M. Sullivan
Keyword(s):  
Temperature Gradient ◽  
Lateral Line ◽  
Effect Of Temperature ◽  
Acclimation Temperature ◽  
Lateral Line System ◽  
Line System ◽  
Equilibration Temperature ◽  
Ampullae Of Lorenzini ◽  
Temperature Conditions ◽  
Spontaneous Movements

Conditioned-response experiments show that both bony fishes and selachians have surface thermal receptors. Electrophysiological studies have demonstrated in selachians two mechanisms which could provide continuous information about constant temperature conditions—the ampullae of Lorenzini and the lateral-line system. In other fishes only one such mechanism has been demonstrated, namely the trunk lateral-line system. Impulses from the ampullae and the lateral-line organs are, apparently, always being poured into the central nervous system at a rate which is characteristic of the temperature of the environment. The change in frequency of these action potentials with a given change in temperature is not great and there is no sign of adaptation. These sensory receptor mechanisms could operate in such a way as to give fish an absolute sense of temperature. In addition to this non-adaptive effect of temperature on these two kinds of receptors, there occurs, in the ampullae of Lorenzini only, another spectacular change in frequency of the nerve impulses with change in temperature, and this response is adaptive. This effect disappears with continued exposure to the new temperature, and the spontaneous impulses gradually assume the stable frequency which is characteristic of the temperature.The principal effects of temperature on the activities of fish are as follows: Fish moving in a temperature gradient select a particular temperature because of an effect of the gradient temperatures on their movements. When fish move through the temperatures of a gradient, the frequency of their movements is least in the selected region. Moderately rapid changes of temperature do not elicit locomotor responses from resting fish until very high temperatures are reached, but do affect the frequency of movements of active fish. The frequency of spontaneous movements is related to the equilibration temperature, being greatest at the temperature ordinarily selected by the same fish if placed in a temperature gradient. Maximum cruising speed, as measured at different equilibration temperatures, is greatest at the selected temperature, as is also the distance moved in response to an electric shock. The maximum cruising speed that can be maintained by fish increases, with acclimation temperature, to a peak at the final preferendum.Temperature selection by fish in a gradient is a function of surface thermal receptors not in the trunk lateral line, and of the forebrain. The relation between frequency of spontaneous movements and equilibration temperature depends in some way upon the integrity of the cerebellum.There are a few instances where a correlation has been demonstrated between temperature conditions and behaviour of fish in nature because of the effect of temperature on activity. There are other instances in which distribution of fish in nature appears to be correlated with temperature as a result of selection responses to temperature gradients.

Effect of temperature and deformation on the destruction of bimetal steel 80-steel 12Kh18N10T

1990 ◽  
Vol 32 (10) ◽  
pp. 766-769
Author(s):  
M. A. Krishtal ◽  
Ya. A. Gokhberg ◽  
V. I. Frolov ◽  
L. E. �pshtein ◽  
N. V. Volokhova
Keyword(s):  
Effect Of Temperature ◽  
Steel 12Kh18n10t

Structure and properties of steel 12Kh18N10T after prolonged operation at −183°C

1976 ◽  
Vol 18 (5) ◽  
pp. 430-432 ◽  
Author(s):  
G. A. Stepanov ◽  
L. K. Lokhankina ◽  
V. A. Gorbunov
Keyword(s):  
Steel 12Kh18n10t ◽  
Structure And Properties ◽  
Prolonged Operation
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