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Các bài báo tiêu biểu
A contribution to the mathematical theory of epidemics(1) One of the most striking features in the study of epidemics is the difficulty of finding a causal factor which appears to be adequate to account for the magnitude of the frequent epidemics of disease which visit almost every population. It was with a view to obtaining more insight regarding the effects of the various factors which govern the spread of contagious epidemics that the pres... ...
Tập 115 Số 772 - Trang 700-721 - 1927
Electron emission in intense electric fields
1.
Introduction
.—The main features of the phenomenon of the extraction of electrons from cold metals by intense electric fields are well known, and an approximate theory of the effect was first developed by Schottky. More recently the experimental data have been much improved, notably by Millikan and Eyring, and Millikan and ... ...
Tập 119 Số 781 - Trang 173-181 - 1928
The tension of metallic films deposited by electrolysisIt is well known that metallic films deposited electrolytically are in many cases liable to peel off if deposited to any considerable thickness. This is the case with nickel which, when deposited over a certain thickness, will curl up into beautiful close rolls, especially if it does not adhere very tightly to the body on which it is deposited. For example, if a piece of glass is silvered ... ...
Tập 82 Số 553 - Trang 172-175 - 1909
The quantum theory of the emission and absorption of radiation
The new quantum theory, based on the assumption that the dynamical variables do not obey the commutative law of multiplication, has by now been developed sufficiently to form a fairly complete theory of dynamics. One can treat mathematically the problem of any dynamical system composed of a number of particles with instantaneous forces acting between them, provided it is descr... ...
Tập 114 Số 767 - Trang 243-265 - 1927
The viscosity of a fluid containing small drops of another fluidThe viscosity of a fluid in which small solid spheres are suspended has been studied by Einstein as a problem in theoretical hydrodynamics. Einstein’s paper gave rise to many experimental researches on the viscosity of fluids containing solid particles, and it soon became clear that though complete agreement with the theory might be expected when the particles are true sphered, some modifi... ...
Tập 138 Số 834 - Trang 41-48 - 1932
Atmospheric diffusion shown on a distance-neighbour graph
If the diffusivity K of a substance whose mass per volume of atmosphere is
χ
be defined by an equation of Fick’s type
ū
∂
χ
/∂
x
+
v
... ...
Tập 110 Số 756 - Trang 709-737 - 1926
A theory of the electrical breakdown of solid dielectricsIn the modern theory of metallic conduction initiated by Bloch, conductors, semi-conductors, and non-conducting crystals may be represented by the same model. In this model each electron is supposed to move freely in the periodic field of the lattice. Owing to this field, not all electronic energy levels are allowed; the allowed levels are grouped into bands, separated by energy intervals ... ...
Tập 145 Số 855 - Trang 523-529 - 1934
The reflection of X-rays by crystalsIn a discussion of the Laue photographs it has been shown that they may conveniently be interpreted as due to the reflection of X-rays in such planes within the crystal as are rich in atoms. This leads at once to the attempt to use cleavage planes as mirrors, and it has been found that mica gives a reflected pencil from its cleavage plane strong enough to make a visible impression on a pho... ...
Tập 88 Số 605 - Trang 428-438 - 1913
On the theory of quantum mechanics
The new mechanics of the atom introduced by Heisenberg may be based on the assumption that the variables that describe a dynamical system do not obey the commutative law of multiplication, but satisfy instead certain quantum conditions. One can build up a theory without knowing anything about the dynamical variables except the algebraic laws that they are subject to, and can s... ...
Tập 112 Số 762 - Trang 661-677 - 1926
The cataphoresis of suspended particles. Part I.—The equation of cataphoresis
§ 1. The theory of cataphoresis, and of the complementary phenomenon of electrosmosis, is based on the conception of an “ electrical double layer ” at the interface between the two phases whose relative motion is under consideration.* In the original theory, as propounded by Quincke and Helmholtz, this electrical double layer was regarded as a kind of parallel plate condenser... ...
Tập 133 Số 821 - Trang 106-129 - 1931