High-temperature emissivities of copper, aluminum, and silver

[[abstract]]Using a transient calorimetric technique, the total hemispherical emissivities Eh of very pure copper, aluminum, and silver have been measured at various temperatures in the range 335-1100'K. By carrying out measurements on a sphere, a thin circular disk, and a thin square plate all made of the same copper sample, it is shown that the measured (, is practically independent of the shape of the specimen. Measured E,, values of Cu, Al, and Ag show considerable departure from the theoretical predictions of Davisson and Weeks and the data of previous investigators. Eh data are presented in tabular form at 20'K intervals for all three materials in the range 400-1000'K.[[notice]]補正完畢[[booktype]]紙

A sequential study of circulating immune complexes, complement mediated IC solubilisation and immunoglobulins in borderline tuberculoid patients with and without reactions

Sequential estimates of the levels of circulating immune complexes (CIC), complement catabolic fragment C3d, complement-mediated immune complex solubilization (CMS) and immunoglobulins were made in 24 newly diagnosed patients with borderline tuberculoid leprosy over a 20 month period after initiation of chemotherapy. Fourteen of these patients had not suffered from reversal reactions either at the time of presentation or during the follow-up period. The levels of CIC were elevated in them from the third to the eleventh month after starting chemotherapy and immunoglobulin G (IgG) levels were elevated upto eight months. The concentrations of C3d and immunoglobulins A (IgA) and M (IgM) were normal in these patients. The other ten patients had reversal reaction at the time of diagnosis which subsided by the third month after starting treatment. They did not have reversal reactions later. The levels of CIC and IgG were elevated and those of CMS were depressed throughout the study period. Serum C3d level was initially elevated but came down to normal by the third month while IgA and IgM levels were within normal limits. The relevance of these findings to the genesis of reversal reaction is discussed in this communication

Congruence properties of &#963;<SUB>&#945;</SUB>(N)

This article does not have an abstract

Some applications of Ramanujan's trigonometrical sum C<SUB>m</SUB>(n)

This article does not have an abstract

On the Rogers-Ramanujan continued fraction

In the "Lost" note book, Ramanujan had stated a large number of results regarding evaluation of his continued fraction for certain values of &#964;. It is shown that all these results and many more have their source in the Kronecker limit formula

Theoretical evaluation of the acoustic wave-velocities in diamond

A dynamical method has been described for evaluating the acoustic wave-velocities in different directions in a crystal, from the interatomic forceconstants. The method, applied to the case of diamond, yields two transverse velocities for the dodecahedral directions, one of them coming out to be the same as the transverse velocity in a cubic direction. These facts are in full accordance with theoretical expectations

Variations in the absorption of infra-red radiation by diamond

Using a Residual-ray apparatus, the infra-red absorption coefficients have been measured for 37 cleavage plates of diamond in the 8 µ region. While the absorption coefficients measured with an infra-red monochromator in the region 4–5 µ remain constant within the error of the measurement for all diamonds, those in the 8 µ region show a wide range of variation. The results are correlated with the behaviour of diamond in respect of luminescence and ultraviolet absorption. Some cleavage plates of diamond have also been shown to exhibit patterns of infra-red transparency in the 8 µ region, closely analogous to the patterns of ultraviolet transparency and of luminescence

Dynamical theory of the vibration spectra of crystals. Part I diamond

Exact expressions have been derived for the frequencies of the nine normal modes of vibration of the diamond structure, which take account of the forces of interaction between each atom and its 28 nearest neighbours. The formulæ involve 8 independent constants together with an additional relation between them, and the constants are thus perfectly determinate

Temperature variation of total hemispherical emissivity of stainless steel AISI 304

[[abstract]]Numerical values of the total hemispherical emissivities Eh of a mechanically polished surface and an electropolished surface of a sample of stainless steel, type AISI 304, have been determined experimentally for the first time in the temperature range 340-1100 K. An absolute method incorporating the transient calorimetric principle was used in these measurements. It is found that the 4Eh values obtained are only very slightly different from those predicted by a classical expression for total hemispherical emissivity developed by Davisson and Weeks.[[notice]]補正完畢[[booktype]]紙

The effect of soil moisture perturbations on Indian Monsoon Depressions in a numerical weather prediction model

Indian monsoon depressions (MDs) are synoptic-scale cyclonic systems that propagate across peninsular India three or four times per monsoon season. They are responsible for the majority of rainfall in agrarian north India, thus constraining precipitation estimates is of high importance. Here, we use a case study from August 2014 to explore the relationship between varying soil moisture and the resulting track and structure of an incident MD using the Met Office Unified Model. We use this case study with the view to increasing understanding of the general impact of soil moisture perturbations on monsoon depressions. It is found that increasing soil moisture in the monsoon trough region results in deeper inland penetration and a more developed structure - e.g. a warmer core in the mid-troposphere and a stronger bimodal potential vorticity core in the middle/lower troposphere - with more precipitation, and a structure that in general more closely resembles that found in depressions over the ocean, indicating that soil moisture may enhance the convective mechanism that drives depressions over land. This experiment also shows that these changes are most significant when the depression is deep, and negligible when it is weakening. Increasing soil moisture in the sub-Himalayan arable zone, a region with large irrigation coverage, also caused deeper inland penetration and some feature enhancement in the upper troposphere but no significant changes were found in the track heading or lower-tropospheric structure