Hot-humid Areas Research Articles

Brooding chicks with or without supplemental heat and light

The need for supplemental heat in brooding chicks in a hot humid tropical area where prevalent mean environmental temperature and relative humidity are 33°C and 60%, respectively, was tested in an experiment using 320 broiler chickens.

Modification of the skin blood flow-body temperature relationship by upright exercise.

Modification of the skin blood flow-body temperature relationship by upright exercise.

COLOR OF RECENT SEDIMENTS IN TROPICAL MEXICO: A CONTRIBUTION TO THE ORIGIN OF RED BEDS

The color of Recent fluvial sediments in tropical Mexico supports the hypothesis that the hematite pigment in ancient red beds forms in situ after deposition and is not derived from erosion of red tropical (lateritic) soils, as is commonly claimed. Although red soils do occur in the region9s hot humid source areas, the Recent alluvium that is transported and deposited by rivers is grayish brown because the red detritus is masked by more abundant nonred material. Red coloration occurs only in soils resulting from prolonged weathering on well-drained upland surfaces of Pleistocene age or older.

Limits for cold, heat and humidity in underground shelters.

In the light of information available, underground fall-out shelters can be designed to maintain acceptable thermal conditions in temperate or arctic regions for isolation periods of about 2 weeks, with little or no artificial heating or cooling, and with only minimal ventilation. Mechanical cooling of shelters is essential in desert regions and in many hot-humid areas of the south, where soil temperatures at shelter depths are of the order of 75 to 85 ts F, compared with 45 to 55 ts F in the Temperate Zone, and 10 to 30 ts F in subarctic or arctic areas. (auth)