By John W. Kress
Within the 20th century, scientists within the particularly new box of biology performed a massive position in exposing the threats of environmental degradation, lack of species variety, habitat fragmentation, scarce power assets, and human inhabitants progress. within the essays present in a brand new Century of Biology, a number of the world's such a lot impressive biologists think of how their self-discipline needs to evolve to handle those difficulties within the twenty-first century.
The subsequent 100 years, the participants argue, will probably be ruled via breakthroughs in evolutionary biology and structures ecology; by way of an elevated desire for scientists to combine examine, educating, and repair missions; and through problem-solving ventures on larger spatial and temporal scales. simply because human job and elevated inhabitants will proceed to have a profound impression at the surroundings, biologists needs to outline an efficient approach for integrating the organic sciences with worldwide economics and human social structure.
The 11 members are leaders within the fields of ecology, and evolution, morphology, and improvement, habit, microbiology, atmosphere energetics and biogeochemistry, biodiversity and conservation biology, and human sciences. whereas acknowledging the genuine difficulties their self-discipline needs to tackle, they provide an confident schedule for the longer term.
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444 Current Topics in Non-Elastic Deformation of Geological Materials, V. N. NIKOLAEVSKII, Institute of Physics of the Earth, and J. R. • 455 CONTENTS OF VOLUME 2 X L-4 L-5 Computer Simulation of Fracture in Small Scale Borehole Experiments in Oil Shale, W. J. MURRI, D. R. CURRAN, D. A. SHOCKEY, L. SEAl1AN, R. E. TOKHEIH, S. L. MC HUGH and C. YOUNG, SRI International 465 A Computational Model for Explosive Fracture of Oil Shale, D. A. SHOCKEY, H. J. MURRI, R. E. TOKHEIM, C.
These results constitute an excellent illustration of the use of pressure to perform a critical t est of a theory important in a wide variety of atmospheric pressure applications. ELECTRONIC TRANSITIONS Finally we turn to the third class of phenomena, electronic transitions. These have been observed in a variety of materials, 12 H. G. 2 ~~ z "' Thick Samp le 0 Thin Sample "u. 3 ,------ - - - - -- • --------, 18 kbor !!! i 0:: w "- • • • ,.. l!! >-- W KCI ' Ag,TJ ENERGY TRANSFER EFFICIENCY Fig. 15.
ZnS involves a complex combination of ionic and covalent binding and there are various theories of the behavior of dopants which are useful in describing one aspect or another of the observed phenomena [12-15]. The theory we apply here is perhaps the most general l y usef ul one. It pictures the luminescence as an electron from the coac tivator as donor to the cu+ (with trapped hole) as acceptor. The donor wave functions are spread out over a number of lattice parameters with the effective radius of the orbit a strong function of the trap depth ED.
A New Century of Biology by John W. Kress