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Head position influence on stabilographic variables

Szczygieł E., Piotrowski K., Golec J., Czechowska D., Masłoń A., Bac A., Golec E.

Acta of Bioengineering and Biomechanics

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2016

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Vol. 18, no. 4

49--54

EN

Purpose: Head constitutes 6% of our body weight and significantly influences human body motor system mechanics. From physiological point of view, it should be located at extension of body middle line. Its location being modified results in many consequences in motor system. Our research was aimed at assessing the influence of head position on human body balance stabilographic variables. Methods: The research was made on a group of 62 patients: 45 women and 17 men, aged from 40 to 60 yrs, 46 yrs on average. Head position in sagittal and frontal plane was assessed with photogrammetric method. Chosen stability parameters were estimated with dynamometric platform PEL 38 and computer software TWIN 99. Results: The results confirmed correlations between existing stabilographic values and head position in frontal plane only. Head position, when changed in this plane, increased the amplitude ( p = 0.001) and average speed of body gravity center trembilng ( p = 0.002). There were no significant relations found in sagittal plane ( p > 0.05). Conclusions: Our results show that the head position influences stabilographic variables. Its change in frontal plane decreases body posture stability to the largest extent.

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Fly ash vitrification as the effective physico-chemical waste stabilization method

Sobiecka E., Sroczyński W.

Biotechnology and Food Science

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2011

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Vol. 75, nr 2

35-38

EN

In this paper, the physico-chemical stabilization method of electrical power plant fly ash of the Province of Lodz in central Poland was studied. The chemical composition and leachability of metals were determined in the investigated samples. The ashes were vitrified in a thermal plasma process and their chemical stability was tested to determine whether the ashes can be disposed safely into the environment, specifically onto surface soil. The heavy metal leachability tests proved that the products after vitrification were more stable than non-vitrified waste making it more suitable for disposal into the environment.

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Stabilizowanie nasypów drogowych

Zabuski L.

Zeszyty Naukowo-Techniczne Stowarzyszenia Inżynierów i Techników Komunikacji w Krakowie. Seria: Materiały Konferencyjne

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2009

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Nr 88, z. 144

441-461

PL

W artykule przedstawiono mechanizm działania geosiatki komórkowej przy wzmacnianiu podłoża, tj. zwiększaniu jego nośności i zmniejszaniu odkształcalności. Omówiono metody stabilizowania nasypów drogowych przy zastosowaniu geosiatki. Analizowano przykład wzmocnienia geosiatką nasypu istniejącego, na którym wystąpiło osuwisko oraz przypadki nasypów projektowanych na słabym i na nośnym (mocnym) podłożu. Wykazano pozytywny wpływ zastosowania wzmocnienia w postaci warstw geosiatki na stateczność nasypów.

EN

The paper presents the operation mechanism of the geocell layer, reinforcing the soil foundation, i.e. improving its bearing capacity and decreasing deformability. The methods of road embankments stabilisation using geocells have been described. The example of the reinforcement by geocells of the existing embankment, destroyed by the landslide has been analysed as well as the examples of the embankments in a design stage, founded on the weak- and strong bearing foundations. The positive influence of such reinforcement on the embankment stability has been proved.

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Struktura i właściwości mechaniczne staliwa typu 0.3C-30Ni-18Cr z dodatkami Nb i Ti

Garbiak M., Lenart S.

Inżynieria Materiałowa

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2003

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R. XXIV, nr 6

674-676

PL

W pracy omówiono zmiany w strukturze i właściwościach mechanicznych staliwa typu 0.3%C-30%Ni-18%Cr wywoływane stabilizowaniem stopu dodatkami niobu i tytanu. Zawartość niobu w trzech badanych stopach wynosiła kolejno 0.0, 0.55 i 1.75 a tytanu odpowiednio 0.03, 0.28 i 0.93% mas. Mikrostrukturę stopów badano za pomocą mikroskopii świetlnej, mikroanalizy metodą EDX oraz dyfrakcji rtg z izolatów. W badanych stopach, w zależności od ich składu chemicznego, stwierdzono obecność węglików typu M23C6 i MC a także fazy G. Pomiary właściwości mechanicznych stopów w temperaturze otoczenia i 900 stopni Celsjusza wykazały niższe wartości parametrów R0.2, Rm i A10 przypadku stopów stabilizowanych.

EN

The study discusses the changes in microstructure and mechanical properties of cast steel 0.3%C-30%Ni-18%Cr due to stabilization with niobum and titanium. The niobum content in three tested alloys was 0.0, 0.55 and 1.75 and that of titanium 0.03, 0.28 and 0.93 (wt%) respectively. Microstructure was examined using light and a scanning electron microscope with EDX attachment and X-ray diffraction of residues from annealed alloys. The following phases, depending on chemical composition of cast steel, where identified: carbides of M23C6 and MC type and a G phase. The mechanical properties such as R0.2, Rm, and A10 were examined at both ambient and temperature of 900 degrees centigrade. Stabilized alloys had lower values of those parameters.