Coefficient, absorption accumulation

Any thermal effect due to heat accumulation was not observed in these experiments. The NL absorption coefficients obtained from 7 xm beam waist radius were... 

The foliar absorption coefficient k ranges from 0.3 to 1.3 for most plants. Light penetrates the vertically oriented blades of grasses rather easily in such cases, k can be near 0.4. What cumulative leaf area per ground area reduces the incident PPF by 95% for grasses with such a foliar absorption coefficient By Equation 9.5, the accumulated leaf area per unit ground area in this case is... 

The new potential photosensitizer octa-alpha-butyloxy ZnPc (8-alpha-bo-ZnPc) is characterised by a high absorption coefficient in the far-red (735 nm). However, this compound showed no accumulation in the Lewis lung carcinoma in mice over a one-week investigation period [45]. 

A variety of assumptions could be made to explain the low temperature coefficient of the resonance absorption. The calculated temperature coefficient is due to the absorption in the Doppler region. The extent of the Doppler region could be decreased, most simply, by increasing the a and F of the lines. If this interpretation is correct, it re-emphasizes the great variability in the constants of the various lines. In view of the experimental data which have been accumulated in. the last few years on the constants of resonance lines, such a variability should be even less surprising now than it was when our reports were written. 

Neutron absorption in uranium is believed to be principally of two general types an absorption by U-238, chiefly without fission, in the thermal region and in a resonance region and absorption by U-235 which leads to fission. A detailed knowledge of these absorption processes is of interest in calculating the optimum size and spacing of the spheres to be used in the experiments on the chain reaction. The object of the present series of experiments is the study of the absorption processes in uranium and in particular is the accumulation of data from which can be calculated absorption coefficients for thermal and resonance neutrons. 

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