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Vaida-Cămăraș, Romania

The article will present the constructive and functional characteristics optimization of the straw walkers at the Romanian cereal harvester combine C110, to increase its working capacity, based on theoretical study of pile displacement on the shaker element of the straw walkers on two axes, shown in previous issues of this journal.

The article continues to present some results related to those in [3], thoroughly studying the results of aggregates working optimization operating mode designed to soil works, their significance and interpretation.

The paper presents a precise method of comparing the energy performance provided by a Diesel engine in diesel fuel supply situation and an alternative fuel option. It is motivated the need for statistical approach of engine operating parameters developments and the technique of this approach is described. Using statistical expressions of parameters developments the ways in which homologous developments, belonging to two different supply variants, can be compared to evaluations, are highlighted. The described theoretical appliance is illustrated with the results of an experiment made by the author to assess the performance of mixtures diesel -biodiesel used to alternative supply of a Diesel engine.

Frasineanu C.,Academy of Economic Studies Bucharest | Chiurciu I.A.,USAMV | Stamate V.,INMA
INMATEH - Agricultural Engineering | Year: 2013

Environmental protection is of major importance because economic development takes place in the natural environment in which we are existing and working. According to the Environmental Protection Law 137/1995, pollution is the direct or indirect introduction, as a result of activities carried out by humans, of substances in soil or air that can harm human society and environment quality. Pollutants can be characterized according to the source, the aggregation, of changes determined. Among the elements that characterize a pollutant analyzed through its interactions with the environment, the most important are the maximum permissible concentration, degree of persistence and synergy effects that trigger when they are together with other pollutants. This article presents the optimal level of pollution reduction and of losses in correlation with the benefits and the costs of implementing. © 2013.

Tomoaia-Cotisel M.,Babes - Bolyai University | Cota C.,INMA | Mocanu A.,Babes - Bolyai University | Horovitz O.,Babes - Bolyai University
Materiale Plastice | Year: 2010

The present work provides new insights about the micro and nanostructure of native starch granules from potato and maize by scanning electron microscopy (SEM) and atomic force microscopy (AFM). SEM images revealed the shape and the size distribution of the granules as well as some features, such as holes and wrinkles, on the surface of granules. These data were confirmed by AFM observations which showed the presence of numerous protrusions (nodules) on the granules surface of both starches. The structure of granules surface consisted of small spherical particles of about 30 nm in diameter, identified particularly for potato starch. These nanoparticles might be related with highly branched amylopectin molecules in substantial agreement with amylopectin blocklets (of about 20 nm) model. Larger particles of about 60 nm up to 80 nm were also visualized especially on the surface of maize starch granules representing different associations of amylopectin and amylose. The largest elongated particles of about 100 nm to 200 nm found randomly on granules of both starches might be assigned to arise from the granule-surface components, such as starch carbohydrates attached to granule proteins and phospholipids, in general agreement with starch granule surface composition data. This investigation also supports the complex structural network for the starch granule surface (periphery) and its role in maintaining the integrity of starch granules and in the starch gelatinization process.

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