A method of using miniature samples for determining mechanical properties of metal of power-generating equipment at thermal power stations in Estonia

Devices for taking miniature samples of metal are described together with techniques for measuring mechanical properties of the metal of power-generating equipment using miniature samples.     

Structure and properties of plasmochemical powders of aluminum oxide

Using modern methods of analysis, investigations of the phase composition, structure, and properties of powders of aluminum oxide synthesized by the plasmochemical method are carried out. The possibility of plasmochemical technology of treatment of dispersed raw materials for obtaining submicrometer and nanodimensional particles of aluminum oxide is shown.     

Permeability of processed needle-punch material made of polyester fibre

Needle-punching produces film-fibre material without destroying the intermediate polymer film. At the minimum needle-punching density, the intermediate layer is perforated without being filled by fibres, and the holes are filled by fibres at significant needle-punching density. The film-fibre material ensures effective filtration of water to remove particles greater than 50 μm in size.     

Formation of the Pore Structure of Needle-Punch Materials

The pore structure of needle-punch materials is basically determined by their volume density. The needle-punching conditions determine the pore structure of the materials only by the volume density values attained during the treatment. The model presented adequately describes pore structure formation in the materials up to the defined values of their volume density. __________ Translated from Khimicheskie Volokna, No. 3, pp. 43–45, May–June, 2005.     

Oxidative transformations of methane: From the fixed bed to nanoreactors

Oxidative transformations of methane on a catalyst (0.9 wt % of La₂O₃ + 0.1 wt % of CeO₂)/MgO located inside the pores of a ceramic membrane occur at temperatures as low as 550°C with a high selectivity that was not previously observed, and terminate mainly with the formation of synthesis gas (carbon monoxide and hydrogen). The observed result is composed of the thermolysis reaction of methane yielding hydrogen and carbon, and comprises the subsequent reverse Buduar reaction. The reforming of carbon dioxide runs intensively when a methane-carbon dioxide mixture is fed into a membrane reactor at 650°C.

     

Faults in the testing and use of gravitational test working hypotheses

An example is given when Le Sage’s working hypothesis on gravity due to a misunderstanding was erroneously repudiated by Q. Majorana. Another example is given for the case of incorrect usage of this working hypothesis that led to erroneous denial of the unique experimental results of Majorana. __________ Translated from Izmeritel’naya Tekhnika, No. 4, pp. 7–12, April, 2006.     

Main results of researches in the area "Diabetes mellitus"

Perhaps no conditions other than cleft lip and palate and oral cancer assemble teams of dentists and physicians intensely focused on treatment and rehabilitation. The oral and maxillofacial surgeon's role is often pivotal especially in the 20-year term of care for the child born with a cleft lip and palate deformity (CLPD). Issues of basic orofacial functions of mastication, respiration and communication overlay human considerations of self-esteem and image. From the moment of birth the child with a CLPD is special and challenged. Early issues concern parent and family acceptance and insuring basic life functions. While not generally a part of the immediate surgical unit, the OMFS often provides surgical consultation, educational and emotional support for the family. A clear picture must be painted of the treatment that will unfold over the next two decades. Realistic optimism is the watchword. Indeed, today there is every reason to anticipate an outcome that will result in a balanced, functional and esthetic face.     

Effect of the Composition of Nonwoven Material on its Sorption Characteristics

The sorption capacity of a nonwoven is not a function of the content of polypropylene or polyester fibres but is determined by the bulk density of the material. The sorption capacity of a nonwoven is also a function of the surface tension of the liquid absorbed by the material.