The phrase "a first proof" is correct and usable in written English.
It can be used in contexts related to publishing, printing, or academic work, referring to an initial version of a document or manuscript that is being reviewed or edited.
Example: "After several revisions, we finally received a first proof of the manuscript for our upcoming book."
Alternatives: "an initial draft" or "a preliminary version".
Electroformed copper-sulfur composite foils are chosen as a first proof of the new concept.
Materials used in practical devices have frequency dependent coefficients, and we provide a first proof of existence and uniqueness for a general class of such materials.
The work is laborious, and students such as Destiny Crowley of the Graduate School of Arts and Sciences were spending considerable time applying the thick black ink and then wiping it nearly off before attempting to print a first proof.
As a first proof of principle, CE-UPy-PCL and UPy-HBP were premixed in solution, dropcast and exposed to primary human monocyte-derived macrophages, in the presence or absence of IL-4-heparin functionalization.
Therefore, this work is intended to be a first proof of concept, with theoretical justifications and numerical investigations, of the advantage of using available multi-modal observations for the estimation and identification of an electromechanical model of the heart.
As a first proof of concept though, it's great.
A first proof-of-principle simulation is presented.
As a first proof-of-concept, we demonstrate the integration of a bioanode and a biocathode into a lamination-based ethanol/O2 microfluidic biofuel cell fabricated via rapid prototyping.
The above promising results have prompted further research toward clinical translation of the proposed concept in a first "proof-of-principle" study in man, using [111In-DOTA]MG11 as a paradigm.
However, compared with PA, TO and its prodrug Race induced less potent increases of tumor uptake, highlighting the significance of inhibitor type, administration route, and dose for implementing a first proof-of-principle study in human.
We have used typical parameters of present state-of-art experimental setups in order to identify the required improvements of these setups to allow for a first proof-of-principle experiment.
