The phrase "ascertain the existence" is correct and usable in written English.
It can be used when you want to determine or find out whether something is present or true.
Example: "The researchers aimed to ascertain the existence of a correlation between the two variables."
Alternatives: "determine the presence" or "verify the existence".
Fermium-250 (30-minute half-life), the alpha-decay product of nobelium, was used to ascertain the existence of nobelium-254.
The attempted inspection of appellant's home was merely to ascertain the existence of evils to be corrected upon due notification or, in default of such correction, to be made the basis of punishment.
Hart laid particular stress on what he designated as the "rule of recognition"—namely, the array of normative presuppositions that underlie the behaviour of legal officials (especially judges and administrators) as they ascertain the existence and contents of the laws in their system of governance.
To ascertain the existence and measure the OB phenomenon in food handlers in relation to foodborne disease and 2. To examine the association of OB with food handlers' risk perceptions, knowledge, attitudes, self-reported practices, training participation, food safety performance of the establishments and microbiological analysis.
We have performed a series of morphology and CO2-probe diffusion analyses to ascertain the existence and composition dependence of voids in graphite/poly vinylidene fluoride) composites both above and below the graphite percolation threshold, as determined from electrical conductivity measurements.
Even if counterfactually all and only intelligent people would wear such apparel, a test designed in this manner would not ascertain the existence of intelligence by testing for capacities directly associated with our understanding of intelligence.
It proves only that at the time of Sima Qian a certain Li family (see above) pretended to be descended from the Daoist sage; it does not give a basis for ascertaining the existence of the latter.
The following year the Japa nese Government sent a survey team to the seas surrounding the isles and ascertained the existence of sediment a mile and a half deep and 90 to 150 miles wide.
This study was an extension to a previous work that ascertained the existence of the binder creep phenomenon as reflected from the continual permeability loss especially on samples conditioned at elevated temperatures.
Some new sufficient conditions for ascertaining the existence and global exponential stability of the periodic solution of such BAM neural networks are obtained by using the properties of nonsingular M-matrix, integral inequality analysis and a continuation theorem based on coincidence degree.
Since vacancies in perovskite oxide film affect transport properties more than ferromagnetic properties, we believe that our stoichiometric BiMnO3 films should have sufficient quality for ascertaining the existence of ferroelectricity in stoichiometric BiMnO3.
