The phrase "absorption is present" is correct and usable in written English.
It can be used in contexts discussing scientific phenomena, processes, or observations where absorption occurs.
Example: "In this experiment, we observed that absorption is present, indicating that the material is effectively taking in the light."
Alternatives: "absorption occurs" or "absorption exists".
Spectroscopic ellipsometry measurements have shown that no absorption is present in the visible spectrum range.
The aim of this study is to determine if systemic absorption is present after 5-fluorouracil (5FU) is used in the vitrectomy infusion.
The baseline has been assumed to be a second degree polynomial, as in laboratory condition it has been shown to well reproduce the signal when no absorption is present [20].
The quantitative interpretation of the transmission spectrum is performed in the portion where no absorption is present (300 820 nm) leading to reliable estimated of particle size populations in the range of 0.02 20 μm.
CH2O absorption is present throughout the whole 327 331 nm range, which can severely affect the accuracy of NCN concentration measurements if both species are present in the measurement volume.
It is shown by numerical calculations that diffraction efficiencies as high as 80%and90%0% can be achieved with sinusoidal and binary contact grating profiles, respectively, in the 1.4 1.7 µm pump wavelength range, where no two-photon absorption is present, thereby allowing higher pump intensities.
A new concept for active vibration absorption is presented.
A novel CO2 gas analyzer based on infrared ray (IR) absorption is presented sufficiently in this paper.
The state of art of the mathematical theory of vibration absorption is presented and illustrated for the benefit of the reader with numerous simple examples.
Two-dimensional concentration distribution for a most typical case of a point source release on the free water surface in a channel flow with bed absorption is presented by means of Chatwin's long-time asymptotic technique.
Failure to demonstrate significant antibody binding by indirect immunofluroescence tests with immune sera, or by absorption, is presented as evidency that H-2 antigen expression is substantially modified on BNU induced leukaemia cells.
