期刊：
The Journal of Chemical Physics,1949年17(1):93 ISSN：0021-9606
作者机构：
Spectroscopy Laboratory, Department of Physics, The Pennsylvania State College, State College, Pennsylvania
摘要：
The Raman spectra of 2‐methyl butane and 2,3‐dimethyl butane were investigated between room temperature and 90°K. In marked contrast to the behavior of the normal paraffins all the main lines persist in the solid phase. The slight change with temperture in the relative intensity of one line pair in liquid 2‐methyl butane was investigated quantitatively with the photoelectric spectrograph. No measurable intensity changes were observed in the 2,3‐dimethyl butane spectrum. The results were interpreted in terms of both a very small (<100 cal. mole−1) and a very large (1600 cal. mole−1) energy difference between the rotational isomers. Although both interpretations appear consistent with the spectroscopic results, neither affords a completely straightforward explanation of all the facts. It is shown for 2‐methyl butane that accurate gaseous heat capacities would distinguish between these alternatives. The spectroscopic data on 2,3‐dimethyl butane are inconsistent with a single molecular configuration possessing a center of symmetry.
期刊：
Eos, Transactions American Geophysical Union,1949年30(1):26-28 ISSN：2324-9250
通讯作者：
Neuberger, H.
作者机构：
Division of Meteorology, Pennsylvania State College, State College, Pennsylvania, United States
通讯机构：
Division of Meteorology, Pennsylvania State College, State College, United States
摘要：
A method for use with captive balloons is described, by means of which the signals from a modified chronometric radiosonde can be transmitted through a nonconducting mooring string. The devices for transmitting and receiving the signals of the meteorosonde are outlined.
期刊：
Eos, Transactions American Geophysical Union,1949年30(3):369-385 ISSN：2324-9250
通讯作者：
Kirkham, D.
作者机构：
Iowa State College, Ames, Iowa, United States
通讯机构：
Iowa State College, United States
摘要：
On the assumption that uniform, water‐saturated soil covered by ponded water, and overlying an impervious layer is drained by equally spaced circular drain tubes at equal depth, two sets of expressions for the velocity potential, stream potential, the drain flux, and the surface inflow distribution are derived. Each alternate expression yields the same result, one set of results being useful in numerical work when the impervious layer is at shallow depth, the other when the impervious layer is at great depth. Parameters are soil permeability, drain depth, drain spacing, drain radius, depth to the impervious layer, and depth of ponded water. The method of complex variable is used. The results are of practical interest in the problem of artificial drainage of land and in the problem of leaching.
