iPhoneAlle anzeigen
iPhone 11iPhone 11 ProiPhone 11 Pro MaxiPhone 12iPhone 12 ProiPhone 12 Pro MaxiPhone 12 miniiPhone 13iPhone 13 ProiPhone 13 Pro MaxiPhone 13 miniiPhone 14iPhone 14 PlusiPhone 14 ProiPhone 14 Pro MaxiPhone 15iPhone 15 PlusiPhone 15 ProiPhone 15 Pro MaxiPhone 16iPhone 16 PlusiPhone 16 ProiPhone 16 Pro MaxiPhone 16eiPhone 8iPhone 8 PlusiPhone SE 2020iPhone SE 2022iPhone XiPhone XRiPhone XSiPhone XS Max
Galaxy A-SerieAlle anzeigen
Galaxy A12Galaxy A13Galaxy A13 5GGalaxy A14Galaxy A15Galaxy A16Galaxy A17Galaxy A17 5GGalaxy A20eGalaxy A21Galaxy A22Galaxy A23Galaxy A24Galaxy A25Galaxy A26 5GGalaxy A32Galaxy A33Galaxy A34Galaxy A35Galaxy A36 5GGalaxy A37Galaxy A40Galaxy A41Galaxy A42Galaxy A50Galaxy A51Galaxy A52Galaxy A53Galaxy A54Galaxy A55Galaxy A56 5GGalaxy A57 5GGalaxy A70Galaxy A71Galaxy A72
Redmi SeriesAlle anzeigen
Redmi 10Redmi 13CRedmi 15 5GRedmi Note 10Redmi Note 10 ProRedmi Note 11Redmi Note 11 ProRedmi Note 11 Pro Plus 5GRedmi Note 11sRedmi Note 12Redmi Note 12 5GRedmi Note 12 ProRedmi Note 12 Pro 5GRedmi Note 12 Pro PlusRedmi Note 13Redmi Note 13 5GRedmi Note 13 ProRedmi Note 13 Pro PlusRedmi Note 14Redmi Note 14 Pro PlusRedmi Note 15Redmi Note 15 5GRedmi Note 15 ProRedmi Note 15 Pro 5GRedmi Note 15 Pro Plus 5GRedmi Note 8Redmi Note 8 ProRedmi Note 9Redmi Note 9 Pro
- Startseite
Bücher Englische Bücher Wissen & Bildung Naturwissenschaft, Medizin, Informatik, Technik Physik & Astronomie Thermodynamik Investigation of non-roating piston gauges as primary and secondary standards for the intermediate vacuum-pressure range from 0 to 15 kPA
Derzeit nicht verfügbar
Handgeprüfte Gebrauchtware
Bis zu 50 % günstiger als neu
Der Umwelt zuliebe
Investigation of non-roating piston gauges as primary and secondary standards for the intermediate vacuum-pressure range from 0 to 15 kPA
Ahmed Salama Hashad (Broschiert, Englisch)
★★★★★
☆☆☆☆☆ Keine Bewertungen vorhanden
Optischer Zustand
Beschreibung
Intermediate pressure range measurements in the range of few pascals up to few
kilopascals are very important for many production lines in the industry. This range of
pressure suffers from a lack of pressure standards suitable to measure with low uncertainty.
This research aims at filling this gap by establishing a suitable pressure standard such as
Force-Balanced Piston Gauge (FPG) and to… characterise it as a primary pressure standard
measuring this range of pressure with sufficiently low uncertainty. FPG is a pressure
standard working in the intermediate pressure range of 1 Pa to 15 kPa in both absolute and
gauge pressure operating modes.
FPG uses a special Piston Cylinder Assembly (PCA) with a bi-conically shaped inner
surface of the cylinder. The PCA was measured dimensionally for straightness, roundness,
and diameter. A 3D model was generated by filtering the raw measurement data using a
Gaussian filter and applying the least-squares method to minimise the discrepancies
between dimensional data of different types.
It was challenging to determine the effective area using the dimensional properties of PCA,
considering the effect of the gas flow, and calculating the pressure distribution in the
piston-cylinder gap with boundary conditions presented by the three pressures at the top,
middle, and bottom of PCA. Different mathematical models (ideal and real gas flow as
well as kinetic model) were considered to achieve an effective area of PCA with low
uncertainty.
The uncertainty of this realization depends significantly on the geometric imperfectness of
the PCA, i.e. deviations of the piston and cylinder bore from the ideal cylindrical form. In
the case of axially non-symmetrical PCAs, the latter was a major uncertainty factor. The
effective area was determined with a 2D flow model, which considers PCA radius
variations in both tangential and axial directions. A single effective area value for the entire
PCA was obtained and the contribution of uncertainty due to the axial non-symmetry of
the PCA was excluded.
With this procedure, the effective area of PCA was determined traceable to the SI unit
metre. Additionally, all other parameters affecting the pressure measured by the FPG were
analysed to get an accurate result with decreasing uncertainties and traceable to the SI base
units.
The results were validated by determining the effective area of the FPG taking it as a
secondary standard and comparing it to a classical deadweight pressure balance. Moreover,
the FPG was compared with two other primary pressure standards such as a mercury
manometer and a static expansion system to validate FPG's measurement capability over
the whole operation range of the FPG Dieses Produkt haben wir gerade leider nicht auf Lager.
Handgeprüfte Gebrauchtware
Bis zu 50 % günstiger als neu
Der Umwelt zuliebe
Technische Daten
Erscheinungsdatum
16.09.2021
Sprache
Englisch
EAN
9783956066146
Herausgeber
Fachverlag NW in Carl Ed. Schünemann KG
Serien- oder Bandtitel
PTB-Berichte. Thermodynamik - Wärme (W)
Sonderedition
Nein
Autor
Ahmed Salama Hashad
Seitenanzahl
146
Auflage
1
Einbandart
Broschiert
-.-
★★★★★
☆☆☆☆☆ Leider noch keine Bewertungen
Leider noch keine Bewertungen
Sicher bei rebuy kaufen
Schreib die erste Bewertung für dieses Produkt!
Wenn du eine Bewertung für dieses Produkt schreibst, hilfst du allen Kund:innen, die noch überlegen, ob sie das Produkt kaufen wollen. Vielen Dank, dass du mitmachst!
Sicher bei rebuy kaufen