Similar catalytic systems, such as Pd/Al 2 O 3, were studied by the Freund group, wherein they measured lattice parameters as a function of particle size by TEM and reported a reduction of the distances within the lattice with decreasing cluster size.[ 40 ] Moreover, a recent study of γ-Al 2 O 3 -supported Pt particles with an average diameter of 1 nm demonstrated a Pt–Pt bond length contraction at elevated temperatures.[ 41 ] The largest rhodium particles were observed for zirconiated rhodium catalysts throughout CO exposure at the temperatures studied.
Last month, Nalgene introduced a line of bottles made from a relatively new plastic from the Eastman Chemical Company, Tritan copolyester, that shares most of polycarbonate’s properties, including shatter-resistance, but is made without the chemical.
He […] used to say that each separate death had taught him something new about death, and that he was going to resume this knowledge in a philosophic essay about dying.
The main defects of Comte's ethical system are those that are common to all forms of Eudaemonism: its norm of morality is relative and contingent; it possesses no principles by which the quality of its subject-matter, social happiness, may be defined; its imperative imposes no moral obligation.
