28 research outputs found
Notes on Hidden Mirror World
A few remarks on Dark Matter (DM) models are presented. An example is Mirror
Matter which is the oldest but still viable DM candidate, perhaps not in the
purest form. It can serve as a test-bench for other analogous DM models, since
the properties of macroscopic objects are quite firmly fixed for Mirror Matter.
A pedagogical derivation of virial theorem is given and it is pointed out that
concepts of virial velocity or virial temperature are misleading for some
cases. It is shown that the limits on self-interaction cross-sections derived
from observations of colliding clusters of galaxies are not real limits for
individual particles if they form macroscopic bodies. The effect of the heating
of interstellar medium by Mirror Matter compact stars is very weak but may be
observable. The effect of neutron star heating by accretion of M-baryons may be
negligible. Problems of MACHOs as Mirror Matter stars are touched upon.Comment: Latex, revtex, 24 pages, 1 figure, references updated and adde
ΠΠΎΡΠΈΡΡΡΠΉ ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡ Π΄Π»Ρ Π³Π΅ΡΠ΅ΡΠΎΠ³Π΅Π½Π½ΠΎΠ³ΠΎ ΠΊΠ°ΡΠ°Π»ΠΈΠ·Π°
A effect of the duration of mechanochemical activation process on morphology and particle size distribution of composite powder Cu-13 mass% Al has been investigated by quantitative stereological analysis. It has been found that intensive mechanical failure of particles and increased powder dispersion is directly related to the formation of brittle Cu9Al4 intermetal-lide. Hydraulic characteristics of porous elements for catalytic membranes obtained by hydration hardening of composite powder Cu-13 mass% Al in the form of an 80-100 ΞΌm thick layer on porous titanium discs have been investigated. It was established that the average pore size and permeability coefficient nonmonotonically depend on the particle size of the powder.ΠΠ΅ΡΠΎΠ΄ΠΎΠΌ ΠΊΠΎΠ»ΠΈΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎΠ³ΠΎ ΡΡΠ΅ΡΠ΅ΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π°Π½Π°Π»ΠΈΠ·Π° ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΎ Π²Π»ΠΈΡΠ½ΠΈΠ΅ Π΄Π»ΠΈΡΠ΅Π»ΡΠ½ΠΎΡΡΠΈ ΠΏΡΠΎΡΠ΅ΡΡΠ° ΠΌΠ΅Ρ
Π°Π½ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π°ΠΊΡΠΈΠ²ΠΈΡΠΎΠ²Π°Π½ΠΈΡ Π½Π° ΠΌΠΎΡΡΠΎΠ»ΠΎΠ³ΠΈΡ ΠΈ Π΄ΠΈΡΠΏΠ΅ΡΡΠ½ΠΎΡΡΡ ΡΠ°ΡΡΠΈΡ ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠ½ΠΎΠ³ΠΎ ΠΏΠΎΡΠΎΡΠΊΠ° ΡΠΎΡΡΠ°Π²Π° Cu-13 ΠΌΠ°Ρ.% Al. Π£ΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΎ, ΡΡΠΎ ΠΈΠ½ΡΠ΅Π½ΡΠΈΠ²Π½ΠΎΠ΅ ΠΌΠ΅Ρ
Π°Π½ΠΈΡΠ΅ΡΠΊΠΎΠ΅ ΡΠ°Π·ΡΡΡΠ΅Π½ΠΈΠ΅ ΡΠ°ΡΡΠΈΡ ΠΈ ΡΠ²Π΅Π»ΠΈΡΠ΅Π½ΠΈΠ΅ Π΄ΠΈΡΠΏΠ΅ΡΡΠ½ΠΎΡΡΠΈ ΠΏΠΎΡΠΎΡΠΊΠ° Π½Π΅ΠΏΠΎΡΡΠ΅Π΄ΡΡΠ²Π΅Π½Π½ΠΎ ΡΠ²ΡΠ·Π°Π½ΠΎ Ρ ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΠ΅ΠΌ Ρ
ΡΡΠΏΠΊΠΎΠ³ΠΎ ΠΈΠ½ΡΠ΅ΡΠΌΠ΅ΡΠ°Π»Π»ΠΈΠ΄Π° Cu9Al4. ΠΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½Ρ Π³ΠΈΠ΄ΡΠ°Π²Π»ΠΈΡΠ΅ΡΠΊΠΈΠ΅ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠΈ ΠΏΠΎΡΠΈΡΡΡΡ
ΡΠ»Π΅ΠΌΠ΅Π½ΡΠΎΠ² Π΄Π»Ρ ΠΊΠ°ΡΠ°Π»ΠΈΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΌΠ΅ΠΌΠ±ΡΠ°Π½, ΠΏΠΎΠ»ΡΡΠ΅Π½Π½ΡΡ
ΠΌΠ΅ΡΠΎΠ΄ΠΎΠΌ Π³ΠΈΠ΄ΡΠ°ΡΠ°ΡΠΈΠΎΠ½Π½ΠΎΠ³ΠΎ ΡΠ²Π΅ΡΠ΄Π΅Π½ΠΈΡ ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠ½ΠΎΠ³ΠΎ ΠΏΠΎΡΠΎΡΠΊΠ° Cu-13 ΠΌΠ°Ρ.% Al Π² Π²ΠΈΠ΄Π΅ ΡΠ»ΠΎΡ ΡΠΎΠ»ΡΠΈΠ½ΠΎΠΉ 80-100 ΠΌΠΊΠΌ Π½Π° ΠΏΠΎΡΠΈΡΡΡΡ
ΡΠΈΡΠ°Π½ΠΎΠ²ΡΡ
Π΄ΠΈΡΠΊΠ°Ρ
. Π£ΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΎ, ΡΡΠΎ ΡΡΠ΅Π΄Π½ΠΈΠΉ ΡΠ°Π·ΠΌΠ΅Ρ ΠΏΠΎΡ ΠΈ ΠΊΠΎΡΡΡΠΈΡΠΈΠ΅Π½Ρ ΠΏΡΠΎΠ½ΠΈΡΠ°Π΅ΠΌΠΎΡΡΠΈ Π½Π΅ΠΌΠΎΠ½ΠΎΡΠΎΠ½Π½ΠΎ Π·Π°Π²ΠΈΡΡΡ ΠΎΡ ΡΠ°Π·ΠΌΠ΅ΡΠ° ΡΠ°ΡΡΠΈΡ ΠΏΠΎΡΠΎΡΠΊΠ°
NOx conversion in La0.85Sr0.15Co0.03Mn0.97O3+d-Ce0.9Gd0.1O1.95 porous cell stacks infiltrated with Pt
Porous cell stacks with composite electrodes of La0.85Sr0.15Co0.03Mn0.97O3+d and Ce0.9Gd0.1O1.95 were characterized for the electrochemical reduction of NO in net oxidizing atmosphere in absence or presence of propene in the feed gas. No NOx was converted when the porous cell stacks were at OCV or when polarized. However, when the cells were infiltrated with Pt, an effect of this was observed. It was shown that Pt had a very positive effect on the NOx removal properties of the porous cell stacks, and that NOx could be removed both at OCV or when the porous cells stacks was polarized, both in the absence or presence of propene under net oxidizing conditions. The porous cell stacks was also investigated using electrochemical impedance spectroscopy. It was shown that the impedance data could be de-convoluted into four arcs. Each arc could be fitted with a constant phase elements in series with a resistor. The arcs could be attributed to physical processes