NsShortcut.ps1

function Join-Namespace {
    ($args | %{$_})-join "."
}

function Invoke-Apply {
    $func, $arg = $args
    Invoke-Expression "$func $arg"
}

Set-Alias ns Join-Namespace
Set-Alias apply Invoke-Apply

$d = ns System Data
$table = apply New-Object (ns $d DataTable)

Write-Host $table.GetType().FullName

  #=> System.Data.DataTable