52 research outputs found
ΠΠΈΡΠΎΠ²ΠΎΠ·Π·ΡΠ΅Π½ΡΠ΅ΡΠΊΠΈΠ΅ ΠΎΡΠ½ΠΎΠ²Π°Π½ΠΈΡ ΡΠΊΠΎΡΠ΅Π½ΡΡΠΈΠ·ΠΌΠ° ΠΈ ΡΠΊΠΎΠΌΡΡΠ»Π΅Π½ΠΈΠ΅
ΠΡΠΎΠ²Π΅Π΄Π΅Π½ ΡΡΠ°Π²Π½ΠΈΡΠ΅Π»ΡΠ½ΡΠΉ Π°Π½Π°Π»ΠΈΠ· ΡΠΊΠΎΡΠ΅Π½ΡΡΠΈΡΡΡΠΊΠΈΡ
ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½ΠΈΠΉ Π² ΡΠΎΠ²ΡΠ΅ΠΌΠ΅Π½Π½ΠΎΠΉ Π½Π°ΡΠΊΠ΅. ΠΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΎ ΠΏΠΎΠ½ΡΡΠΈΠ΅ ΡΠΊΠΎΡΠ΅Π½ΡΡΠΈΠ·ΠΌΠ° ΠΊΠ°ΠΊ Π½ΠΎΠ²ΠΎΠ³ΠΎ, ΡΠΊΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΌΠΈΡΠΎΠ²ΠΎΠ·Π·ΡΠ΅Π½ΠΈΡ. Π Π°Π·ΡΠ°Π±ΠΎΡΠ°Π½Ρ ΠΎΡΠ½ΠΎΠ²Π½ΡΠ΅ ΠΌΠΈΡΠΎΠ²ΠΎΠ·Π·ΡΠ΅Π½ΡΠ΅ΡΠΊΠΈΠ΅ ΡΡΡΠ°Π½ΠΎΠ²ΠΊΠΈ ΡΠΊΠΎΡΠ΅Π½ΡΡΠΈΠ·ΠΌΠ°, ΡΠ²Π»ΡΡΡΠΈΠ΅ΡΡ Π°Π»ΡΡΠ΅ΡΠ½Π°ΡΠΈΠ²Π½ΡΠΌΠΈ ΡΡΡΠ°Π½ΠΎΠ²ΠΊΠ°ΠΌ ΠΌΠΈΡΠΎΠ²ΠΎΠ·Π·ΡΠ΅Π½ΠΈΡ Π°Π½ΡΡΠΎΠΏΠΎΡΠ΅Π½ΡΡΠΈΠ·ΠΌΠ° ΠΈ Π½Π°ΡΡΡΡΠ΅Π½ΡΡΠΈΠ·ΠΌΠ°. Π€ΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΠ΅ Π³Π½ΠΎΡΠ΅ΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΡΡΠ°Π½ΠΎΠ²ΠΎΠΊ ΡΠΊΠΎΡΠ΅Π½ΡΡΠΈΠ·ΠΌΠ° ΡΠ°ΡΡΠΌΠΎΡΡΠ΅Π½ΠΎ Π½Π° ΠΏΡΠΈΠΌΠ΅ΡΠ΅ ΡΠΊΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΌΡΡΠ»Π΅Π½ΠΈΡ, Ρ.Π΅. ΠΌΡΡΠ»Π΅Π½ΠΈΡ, Π² ΠΊΠΎΡΠΎΡΠΎΠΌ Π΄ΠΈΠ°Π»Π΅ΠΊΡΠΈΡΠ΅ΡΠΊΠΈ ΡΠΈΠ½ΡΠ΅Π·ΠΈΡΡΡΡΡΡ Π»ΠΎΠ³ΠΈΠΊΠ° ΠΈ ΡΡΠ²ΡΡΠ²Π° Π² Ρ
ΠΎΠ΄Π΅ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΠΎΡΠ½ΠΎΡΠ΅Π½ΠΈΠΉ ΠΎΠ±ΡΠ΅ΡΡΠ²Π° ΠΈ ΠΏΡΠΈΡΠΎΠ΄Ρ
Argon metastable dynamics in a filamentary jet micro-discharge at atmospheric pressure
Space and time resolved concentrations of Ar () metastable atoms at
the exit of an atmospheric pressure radio-frequency micro-plasma jet were
measured using tunable diode laser absorption spectroscopy. The discharge
features a coaxial geometry with a hollow capillary as an inner electrode and a
ceramic tube with metal ring as outer electrode. Absorption profiles of
metastable atoms as well as optical emission measurements reveal the dynamics
and the filamentary structure of the discharge. The average spatial
distribution of Ar metastables is characterized with and without a target in
front of the jet, showing that the target potential and therewith the electric
field distribution substantially changes the filaments' expansion. Together
with the detailed analysis of the ignition phase and the discharge's behavior
under pulsed operation, the results give an insight into the excitation and
de-excitation mechanisms
Π‘Π²Π΅Π΄Π΅Π½ΠΈΡ ΠΎΠ± Π°Π²ΡΠΎΡΠ°Ρ
ΠΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½Ρ Π² Π°Π»ΡΠ°Π²ΠΈΡΠ½ΠΎΠΌ ΠΏΠΎΡΡΠ΄ΠΊΠ΅ Π°Π²ΡΠΎΡΡ ΠΈ ΠΎΠ±Π»Π°ΡΡΠΈ ΠΈΡ
Π½Π°ΡΡΠ½ΡΡ
ΠΈΠ½ΡΠ΅ΡΠ΅ΡΠΎΠ², ΠΊΠΎΠ½ΡΠ°ΠΊΡΠ½Π°Ρ ΠΈΠ½ΡΠΎΡΠΌΠ°ΡΠΈΡ
Axial light emission and Ar metastable densities in a parallel plate dc micro discharge in steady state and transient regimes
Axial emission profiles in a parallel plate dc micro discharge (feedgas:
argon; discharge gap d=1mm; pressure p=10Torr) were studied by means of time
resolved imaging with a fast ICCD camera. Additionally, volt-ampere (V-A)
characteristics were recorded and Ar* metastable densities were measured by
tunable diode laser absorption spectroscopy (TDLAS). Axial emission profiles in
the steady state regime are similar to corresponding profiles in standard size
discharges (d=1cm, p=1Torr). For some discharge conditions relaxation
oscillations are present when the micro discharge switches periodically between
low current Townsend-like mode and normal glow. At the same time the axial
emission profile shows transient behavior, starting with peak distribution at
the anode, which gradually moves towards the cathode during the normal glow.
The development of argon metastable densities highly correlates with the
oscillating discharge current. Gas temperatures in the low current
Townsend-like mode (T= 320-400K) and the high current glow mode (T=469-526K)
were determined by the broadening of the recorded spectral profiles as a
function of the discharge current.Comment: submitted to Plasma Sources Sci. Techno
A review of source tracking techniques for fine sediment within a catchment
Excessive transport of fine sediment, and its associated pollutants, can cause detrimental impacts in aquatic environments. It is therefore important to perform accurate sediment source apportionment to identify hot spots of soil erosion. Various tracers have been adopted, often in combination, to identify sediment source type and its spatial origin; these include fallout radionuclides, geochemical tracers, mineral magnetic properties and bulk and compound-specific stable isotopes. In this review, the applicability of these techniques to particular settings and their advantages and limitations are reviewed. By synthesizing existing approaches, that make use of multiple tracers in combination with measured changes of channel geomorphological attributes, an integrated analysis of tracer profiles in deposited sediments in lakes and reservoirs can be made. Through a multi-scale approach for fine sediment tracking, temporal changes in soil erosion and sediment load can be reconstructed and the consequences of changing catchment practices evaluated. We recommend that long-term, as well as short-term, monitoring of riverine fine sediment and corresponding surface and subsurface sources at nested sites within a catchment are essential. Such monitoring will inform the development and validation of models for predicting dynamics of fine sediment transport as a function of hydro-climatic and geomorphological controls. We highlight that the need for monitoring is particularly important for hilly catchments with complex and changing land use. We recommend that research should be prioritized for sloping farmland-dominated catchments
A review of source tracking techniques for fine sediment within a catchment
Excessive transport of fine sediment, and its associated pollutants, can cause detrimental impacts in aquatic environments. It is therefore important to perform accurate sediment source apportionment to identify hot spots of soil erosion. Various tracers have been adopted, often in combination, to identify sediment source type and its spatial origin; these include fallout radionuclides, geochemical tracers, mineral magnetic properties and bulk and compound-specific stable isotopes. In this review, the applicability of these techniques to particular settings and their advantages and limitations are reviewed. By synthesizing existing approaches, that make use of multiple tracers in combination with measured changes of channel geomorphological attributes, an integrated analysis of tracer profiles in deposited sediments in lakes and reservoirs can be made. Through a multi-scale approach for fine sediment tracking, temporal changes in soil erosion and sediment load can be reconstructed and the consequences of changing catchment practices evaluated. We recommend that long-term, as well as short-term, monitoring of riverine fine sediment and corresponding surface and subsurface sources at nested sites within a catchment are essential. Such monitoring will inform the development and validation of models for predicting dynamics of fine sediment transport as a function of hydro-climatic and geomorphological controls. We highlight that the need for monitoring is particularly important for hilly catchments with complex and changing land use. We recommend that research should be prioritized for sloping farmland-dominated catchments
The influence of torque and velocity on erector spinae muscle fatigue and its relationship to changes of electromyogram spectrum density
Verhalten der Hornhaut nach Implantation intraokularer Linsen durch kornealen Starschnitt
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