THE INFLUENCE OF THE SPEED OF REVOLUTION OF A HAMMER MILL ON MISCANTHUS CHIPPINGS

Taking into consideration the fact that biomass is gradually replacing the existent energy resources, it is necessary to know the preparation process. The first step of this process takes place from the harvesting stage that can be done with or without cutting. High volume of biomass represents an impediment in its usage as a final product. It is necessary to transform it in pellets or briquettes. Thus, each stage of the preparation process was studied by researchers both for establishing the influence of biomass properties on the process as well as for designing the equipment used for preparation process. In this paper experimental research regarding the influence of the speed of revolution of a hammer mill on miscanthus chippings were done. The usage of hammer mills it happens in generally during the second stage of preparation process which refers to fine grinding process of vegetal biomass

Boundedness, compactness and Schatten-class membership of weighted composition operators

The boundedness and compactness of weighted composition operators on the Hardy space ${\mathcal H}^2$ of the unit disc is analysed. Particular reference is made to the case when the self-map of the disc is an inner function. Schatten-class membership is also considered; as a result, stronger forms of the two main results of a recent paper of Gunatillake are derived. Finally, weighted composition operators on weighted Bergman spaces $\mathcal{A}^2 \alpha(\mathbb{D})$ are considered, and the results of Harper and Smith, linking their properties to those of Carleson embeddings, are extended to this situation.Comment: 12 page

EXPERIMENTAL RESEARCH ON ENERGY AND OPERATING PARAMETERS OF THE TILLER M7.5 + REVERSIBLE PLOW PR1 AGGREGATE

This paper shows some information about the experimental research made todetermine the operating parameters of an aggregate which consists of a 7.5 hp tiller, symbolized M7,5 and a reversible plow with a band, symbolized PR1. The researches were carried out in real working conditions, the ultimate goal being to promote the marketing of the mentioned machine. To achieve optimal conditions for growing plants in general, and vegetables particularly in small farms and individual households, a good quality plowing it’s essential. This work can be realized with smaller equipment and addequate working capacities such as tillers in aggregate with technical working equipments, these being the ideal solution to meet the needs of small farmers

STAND FOR DETERMINING THE WEAR OF ACTIVE BODIES UNDER ACCELERATED REGIME

This paper presents the results of experimental research for the comparative testing of chisel knives for soil processing (manufactured of steel type 30MnCrB5, respectivelyof those charged with electrode made of tungsten carbide in the coating), from combiners, by analyzing their mass wear at different speeds and working depths in friction with the abrasive media (fine quartz sand) on the stand