Temperature Andhumidity Research Articles

Microclimatic interactions in agroforestry systems

The interaction of the components of an agroforestry system with elements of microclimate is presented in terms of the interception by foliage of radiant energy and of rainfall; and of the temperature, humidity and windspeed of air surrounding the foliage. Most of the measurements reported are from a trial in which pearl millet was grown at ICRISAT, Hyderabad, between hedges of Leucaena leucocephala Lam. In terms of microclimate, the main advantage of the alley system was to intercept more light throughout the year and therefore to produce more biomass. Temperatureand humidity within the alleys differed little from values in the open but windspeed was substantially less. The main disadvantage of the system in terms of pearl millet production was therefore competition below ground rather than above.

The distribution of the eggs of Mammalian Lice on their hosts. 2. Analysis of the Oviposition behaviour of Damalinia ovis (L)

The behaviour pattern of Damalinia ovis (L.) is adapted to the physical features of the environment in which the louse lives. In stage 1, the louse was attracted to temperatures between 35 and 40�C and this temperature zone was necessary for oviposition to proceed satisfactorily. Optimum temperature conditions were between 37 and 39�C. In stage 2, the louse orientated itself so that its head was directed towards the warm end of a temperature gradient or towards the saturated end of a humidity gradient, but when these gradients were antagonistic the orientation to temperature dominated. At the commencement of stage 3, the louse reversed its orientation to both temperature and humidity gradients but again the attraction to temperature was dominant. Before egg laying commenced, a fibre of suitable diameter had to be caught by a gonopod and held next to the abdomen. The resulting tactile stimulus was critical and its absence inhibited oviposition. Other factors which influenced oviposition were the depressant effect of high humidities, the orientation to light, and the attraction to other ovipositing lice and eggs.

A correlation computer and applications to radio propagation

Correlation functions of data, such as fading radio signals or temperature-and humidity fluctuations of the atmosphere, offer a powerful tool for analysis. By conventional methods, computation of these functions is long and tedious. Thi paper describes a computer which was constructed for this purpose. The data to be studied are transcribed onto magnetic tapes. These tapes are then run through a computer which computes the auto- or cross-correlation functions, and plots the resulting function through a recording meter. An example of the application of this computer to the study of the turbulence of the atmosphere is shown.