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One of the most common castings applied in industrial production is aluminum-silicon alloy (ca. 17% Si). Non-modified Al-Si alloy is characterized by coarse-grained structure, responsible for its poor mechanical properties. In the present studies, which constitute part of thorough research on complex treatment of hypo-eutectic silumins directly in the casting mold, an attempt was made to analyze the...
The top quark, a much sought-after subatomic particle, was discovered at Fermilab in 1994. Evidence for this discovery came from both of the two giant collision detectors at this facility. This article describes some of the precise measure-ment techniques used during the major rework project for one of these machines, the Collider Detector at Fermilab (CDF), a 12 m high, 12 m wide, 10 m long assemblage...
The main aim of the present studies was to assess the accuracy of velocity determination of a single GPS receiver. Velocity is determined on the basis of the Doppler shift. The single point positions, required in the model applied, are derived from code measurements. The theoretical basis of Doppler measurements, the computational model applied and the results obtained are analyzed in the paper.
The paper deals with the stereometric properties of a 50H grade steel surface layer modified with a semi-continuous CO2 laser beam. The results were subjected to a mathematical analysis and described with a function depending on the treatment parameters. The dependences were presented graphically. The direction of treatment parameter variation allowing to obtain the most beneficial surface roughness...
A method of vertical cuboid fitting into a set of points is described in the paper. This method was employed to determine the layout corrections during the construction of a swimming pool.
The paper presents the effects of magnetizers on combustion-ignition engine operation. The research was carried out with an Opel Astra car, using magnetizers in the fuel supply systems for both petrol and LPG. The results show that fuel consumption decreased as the results of fuel preliminary treatment with a magnetic field. The composition of exhaust gases was unchanged.
A photogrammetric method of stress analysis has been developed to test thin, nonstandard windows designed for hydrogen absorbers, major components of a muon cooling channel. The purpose of the absorber window tests is to demonstrate an understanding of the window behavior and strength as a function of applied pressure. This is done by comparing the deformation of the window, measured via photogrammetry,...
Wheat grains were stored in the three types of the steel cover grain elevators with different systems of ventilation. The subject of analysis was the pattern of temperature, humidity modifications, as well as physical and biological properties of the grain in some sampling points of grain elevators. In the elevators placed outside the store grain temperature in the centre of grain mass was decreasing...
The method of testing presented in the paper consists in setting seeds in motion at such a velocity that their collision with a plane perpendicular to the motion trajectory of a seed results in seed coat cracking. Seeds were put in motion on a test stand with a rotating radial disk. After leaving the disk seeds strike planes placed perpendicularly to the motion trajectory. The results obtained show...
After harvesting winter wheat grain (Roma and Elena varieties) was dried and stored in three types of silos. A floor store in which grain was stored in corn-bin after drying in M - 807 dryer was used for comparison purposes. After 4, 8 and 10 months of storage, phytopathological analysis of the dried grain from different types of silos was carried out. It was found that the best storage conditions...
The paper presents different forms of trochoid equations which may be used for describing the geometry of solid sections formed by seed outer surfaces. Special attention was paid to the possibility of choosing a given type of a trochoid equation with its modifications, as well as to the possibility of selecting parameters and coefficients characteristic of a given equation form.
The paper presents the results of studies on the effects of the fat content on plant material density during compression and pressing, as well as the density and hardness of the agglomerate. The experimental material were wheat and rape mixtures (fat content: 1.5% - 44.1%). It was found that a higher fat content results in lower density of plant material in the chamber of a pressing unit for characteristic...
The paper presents a method enabling random generation of the solid shape. Coefficients and indices (exponents) of the power were introduced into a system of parametric equations of a sphere. The system of equations modified in this way was used for describing the solid shape. Random changes in the values of coefficients and indices (exponents) of the power resulted in changes in the dimensions of...
The paper presents the results of tests performed on rapeseeds whose coats were removed using disks equipped with cylindrical blades. The disks were mounted on a laboratory disk huller. The working parameters of the huller were changed during the experiment. Before starting the hulling process, the feed hopper was placed 30 mm from the disk center. The height of the slot between the hulling disk and...
The parameters and translocation velocity of a laser beam, as well as the focus position in relation to the sample surface and the thickness of a hardened layer of 50H grade steel were analyzed. The sample surface was treated with a CO2 laser beam with power of 75W. The thickness of the hardened layer was evaluated on the basis of micro-hardness distribution on the surface layer cross-section. The...
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