Transition/transitional

Glass transition Transition region or state in which an amorphous polymer changed from (or to) a viscous or rubbery condition to (or from) a hard and relatively brittle one. Transition occurs over a narrow temperature region similar to solidification of a liquid to a glassy state. This transformation causes hardness, brittleness, thermal expansibility, specific heat, and other properties to change dramatically. 

In a combined experimental/computational study, the vibrational spectra of the N9H and N7H tautomers of the parent purine have been investigated [99SA(A) 2329]. Solvent effects were estimated by SCRF calculations. Vertical transitions, transition dipole moments, and permanent dipole moments of several low-lying valence states of 2-aminopurine 146 were computed using the CIS and CASSCF methods [98JPC(A)526, 00JPC(A)1930]. While the first excited state of adenine is characterized by an n n transition, it is the transition for 146. The... 

Transit Transit Passenger Intercity Intercity Year Bus Bail Car Bail Bus... 

Gx to S phase cell-cycle transition. Transition is required for the onset of IL-2 induced T-cell proliferation. Additionally, SRL also attenuates growth factor induced proliferation of several nonimmune cells and also inhibits metastatic tumor growth and angiogenesis. 

As is the case with mentoring for parfners, fhe executive mentor s task consists of supporting the executive in making significant transitions. Transitions can be effected in areas such as the executive s thought processes, their perspectives and their self-knowledge. 

In this section the effect of spin-orbit coupling on radiative and radiationless intercombinational transitions (transitions occurring between states of different multiplicity) will be investigated. We will be particularly concerned with the use of internal and external heavy atoms to induce spin-orbit coupling. The effect of heavy atoms on intercombinational processes occurring in aromatic hydrocarbons, carbonyl compounds, and heterocyclic compounds will be discussed. 

Figure 2. Reduced transition temperatures as a function of PPDA monomer and polymer concentration for the isotropic to smectic A transition before (O) and after polymerization ( ) and for the smectic A to smectic C transition transition before ( ) and after polymerization ( ).

The intensity of an n-> 7T transition (transition of one p-electron of a lone electron pair from a nonbonding (n) to an antibonding (tt ) orbital) is about two magnitudes less than the dominant transitions and thus has no effect on the... 

Fig. 5. Zr/AbOs vs. Y/AI2O3 plot showing tholeiitic-transitional, transitional, and transitional-calc-alkaline nature of the volcanic rocks that host the Restigouche massive sulfide deposit. Zr/Y boundary ratios for the trends that divide the tholeiitiic-transitional and transitional-calc-alkaline fields are 4.5 and 7, respectively.

The Mount Brittain Formation is made up of tholeiitic-transitional, transitional, and transitional-calc-alkaline dominantly felsic volcanic units and have similar magmatic nature that is recognized elsewhere in felsic volcanic rocks of the BMC. 

The soft mode concept can be extended to all distortive phase transitions (transitions with relatively small atomic displacements), even if they are only close to second order. In the case of a ferro-distortive transition, as for example in BaTiOs or KDP, the order parameter is proportional to the spontaneous electric polarization Fj. d F/ dp is not only proportional to co, but also to the dielectric susceptibility. This does not, however, mean that all components of the order parameter eigenvector must contribute to Ps. 

It was mentioned above (see Sect. 2) that for centrosymmetic molecules, such as all-trans polyenes and a,c<>-disubstituted frans-polyenes, there is a complementarity between the selection rules for IP- and 2P-allowed transitions. Transitions from the groimd state (which is of gerade type) to a B state are visible in the IPA spectriun, while transitions from the ground state to an Ag state appear in the 2PA spectrum. For this reason, 2P spectroscopy has... 

Spin-forbidden transitions. Transitions in which the spin of an electron changes are not allowed, because a change from one spin to the opposite involves a change in angular momentum and such a change would violate the law of conservation of angular momentum. 

If it happens that a single transition overwhelmingly dominates the spectral series then the f-value for this transition will be approximately given by the sum rule, equation (16). Such a situation may be expected to prevail when the ( and (/ +1) wavefunctions overlap very strongly and are radially separated from the core, e.g., in s—>p transitions. Transitions to be compared in the case ofthe alkali elements are [22]... 

Early adult transition Transition from adolescence through exploring and experimenting with different roles and career choices mainly through course work and practical experiences... 

Transitional Transitional cell papilloma Hematopoietic Transitional cell carcinoma... 

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