Bent in its pursuit. But in this company, we hear again in our minds the sound of distant battles. This room echoes once more to those words that describe the heights of bravery in war, above and beyond the call of duty. Five heroic sons of america come to us today from the tortured fields of vietnam. They come to remind us that so long as that conflict continues, our purpose and our hopes rest on these steadfast bravery of young men in battle. These five soldiers in their separate moments of supreme testing summoned a degree of courage that stores wonder and respect and an overpowering pride in all of us. Through their spectacular courage, they set themselves apart in a very select company. They represent the contribution of more than a half a million Young Americans to a world of order and of peace. Other bitter days and bitter and other battles still lie ahead. I cannot emphasize strongly enough that we have not attained peace. Only the possibility of peace. We shall need in the day
Molecular sieve membrane-based separation technology, featured with low energy consumption and small carbon footprint, has attracted much attention in gas separation.
Metal-organic frameworks (MO .