"explanation at hand" is a correct and usable phrase in written English.
You can use it to refer to an explanation that can be quickly accessed or is easily understood. For example, "I didn't need to look up the definition, the explanation at hand was sufficient enough."
The effect is calming: if you feel like you don't understand why there are sandbags set up in the foyer, or why there are holes sawn out of the gallery walls, an explanation is at hand.
Demonstrating that an adequate scientific explanation is at hand, however, imposes demands beyond the acquisition of information about initial conditions and laws.
Even when information is conveyed using diagrams and simulations, for example, as long as it satisfies conditions (CA-1) through (CA-4 no CA-4 nohether those conditions are satisfied imattertly or explicitly—an adequate scientific explanation is at hand.
One can notice measurable differences in isotopic character, and reasonable explanations are at hand for such observation of variations in the nature.
His fortunes decline when valid explanations are at hand.
But not everyone puts it down to extraterrestrial activity; other explanations are easily at hand.
Even from a purely scientific perspective, the process of nuclear fission has given rise to many puzzles and complexities, and a complete theoretical explanation is still not at hand.
To that end, in addition to a thoughtful, plain language explanation of the issues at hand and Aereo's stance, you'll also find copies of the existing decisions on the books regarding Aereo's service from lesser courts, as well as the company's own briefs, and the Amicus briefs of companies and advocacy organizations that support Aereo's argument.
The explanations are as near at hand as the general television trend since Sept. 11: viewers have been flocking to the so-called comfort food of reliable old TV favorites and shying away from anything new or outrageously different.
