Treesearch

A "bench-top" calorimeter was constructed to determine the radiation-convection partition of energy released in the burning of fuel. Samples of 1 to 2 g, no larger than 4 cm in horizontal dimension, and with flame height less than 15 cm, can be accommodated. The apparatus functions by (1) absorbing radiant energy from the burning fuel in an insulated thin aluminum shell whose temperature rise is recorded by a series of imbedded thermocouples, and (2) measuring convective energy by recording the electric power required to heat an air stream so that it just balances the flow rate and...

When samples undergo a complicated set of simultaneous and sequential reactions, as cellulose does on heating, results of thermogravimetric and differential thermal analyses are difficult to interpret. Nevertheless, careful comparison of pure and contaminated samples, pyrolyzed under identical conditions, can yield useful information. In these experiments TGA and DTA curves were obtained, in air and in an inert atmosphere (nitrogen). with "ash-free" cellulose (ash content <0.01%), "pure" cellulose (ash content ~0.15%), and "treated" cellulose (1.5% KHCO3, added). The results show that as...

The mutarotation of α- and β-D-glucose near their melting points has been studied in the neat materials as well as in the presence of water, and at low temperature in the presence of H3BO3 and NaHCO3. The process of mutarotation was found to become very fast as soon as the bulk of the material melted.

Lists 60 references, 21of which emphasize the desirable wood working characteristics of the species.

Describes the design and construction of a 1-pound, battery-operated, time-signal transmitter, which is usable with portable radio or field telephone circuits for synchronizing multi-theodolite observation of pilot balloons.

Within the area sampled, potentially hazardous lodgepole pine were common on recreational sites. The incidence of decayed and mechanically weak trees was correlated with fire damage. Two-thirds of fire-scarred trees were decayed; one-third were rated potentially hazardous. Fire scars occurred roughly in proportion to level of plot recreational use.

Two versions of a commonly used U.S. Forest Service sign ('America Needs Productive Forests') were tested on four adult special-interest groups in Butte County, California. Half the members were shown the regularly used sign; the other half, a modified sign that included the Smokey Bear symbol. Responses to questionnaires by both groups suggested that each sign had a different impact and meaning, and brought out different concepts.

Forest fires started by children playing with matches pose a threat to the Angeles National Forest. An investigation of the problem has gathered some data on the characteristics of the offenders, appraised existing organizational structures and procedures for dealing with the problem, and recommended some action to improve the situation.

A feasibility study was conducted on the Stanislaus National Forest to find out if logging slash, thinnings, and brush could be disposed of by burying. This method of slash disposal shows promise and has some distinct advantages over disposal by chipping and burning.

Helicopters may prove the best method of applying sulfur fertilizer on rangeland too steep for ground application, or with no nearby landing strip for fixed-wing aircraft. Helicopter fertilization of 457 acres of the San Joaquin Experimental Range in central California in 1960 and 1963 was fast and practical.