Springs Creation

What seemed like an endless wait is now over. It s spring, and the wet ground seems almost to be aUve. The air too seems alive and we tingle all over with expectation. We expect the commitment we had to our visions and ideas throughout the winter to come to something. We expect our patience during the darkness and the silence to be rewarded with creation, and we get that in spring. 

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Leade, Jane Ward. Tree of Faith or The Tree of Life Springing up in the Paradise of God From which All the Wonders of the new Creation, in the Virgin Church of the First- bom of Wisdom must proceed. London , 1696. 

Judson, H. F. (1996(1980]), The Eighth Day of Creation Makers of the Revolution in Biology, Cold Spring Harbor Laboratory Press, Cold Spring Harbor, NY. 

Water intrusion-extrusion isotherms performed at room temperature on hydrophobic pure silica chabazite show that the water-Si-CHA system displays a real spring behavior. However, Pressure/Volume differences are observed between the first and the second cycle indicating that some water molecules interact with the inorganic framework after the first intrusion. 29Si and especially H solid state NMR and powder X-ray diffraction demonstrated the creation of new defect sites upon the intrusion-extrusion of water and the existence of two kinds of water molecules trapped in the super-cage of the Si-CHA a first layer of water strongly hydrogen bonded with the silanols of the framework and a subsequent layer of liquid-like physisorbed water molecules in interaction with the first water layer. 

Silent Spring was immensely popular and influential. Carson s work almost single-handedly created modern society s fears about synthetic chemicals in the environment and, among other things, fostered renewed interest in the science of toxicology. It also helped pave the way for the introduction of several major federal environmental laws in the late 1960s and early 1970s, and for the creation of the EPA in 1970. 

In the electronic Hamiltonian t +i, is the transfer integral, i.e. the re-electron wavefunction overlap between nearest neighbour sites in the polymer chain, and is equivalent to the parameter /3 in Equation (4.20), and c 1+,s. and clhS are creation and annihilation operators that create an electron of spin s ( 1/2) on the carbon atom at site n-f 1 and destroy an electron of spin, s at the carbon atom on site n, i.e. in effect transfer an electron between adjacent carbon atoms in the polymer chain. The elastic term is just the energy of a spring of force constant k extended by an amount ( +1— u ), where the u are the displacements along the chain axis of the carbon atoms from their positions in the equal bond length structure, as indicated in Fig. 9.8(b). The extent of the overlap of 7i-electron wavefunction will depend on the separation of nearest neighbour carbon atoms and is approximated by ... 

Judson, H., 1996. The Eighth Day of Creation. Cold Spring Harbor Laboratory. 

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