Search Results

You are looking at 1 - 10 of 91 items for :

  • "Deflection" x
  • All content x
Clear All

minimisation. The technique is applicable to deflection functions with multiple degrees of freedom and seems to have more effective convergence than the Raleigh–Ritz technique [ 14 ]. The work principle is combined with Taylor's series to form the deflection

Open access

Bevezetés: A szívkatéter olyan intravascularis katéter, amelyet a szívbe vezetnek vagy ültetnek be diagnosztikus vagy terápiás célból. A katéterek felvezetés/eltávolítás közben megtörhetnek vagy eltörhetnek. Célkitűzés: A szerzők két azonos alapanyagú, de különböző átmérőjű katéter hajlékonyságának meghatározását tűzték ki célul a Food and Drug Administration ajánlása alapján. Módszer: Meghatározták a hajlítási pontokat, a pontokon az átmérőcsökkenést, az elhajlás változását, továbbá e két paraméter csúcstól mért távolságának függését, korrelációjukat és a katéter kezdeti átmérőjének hatását. A katétereket 9-9 ponton (120–280 mm-re a páciensbe bevezetett végtől 20 mm-ként), 16 különböző sugarú idomszeren hajlították meg, amelyek sugara 10 mm-től 2,5 mm-ig 0,5 mm-ként csökkent. Eredmények: Megállapították, hogy az átmérőcsökkenés és az elhajlás lineárisan korrelál egymással, és függetlenek a mérési pont helyétől mindkét katéter esetében. A nagyobb átmérőjű katéternél szignifikánsan (p = 0,05) nagyobb volt az átmérőcsökkenés, mint a kisebbnél, de az átmérőcsökkenés és az elhajlási görbék lefutása hasonló. Következtetések: Az alkalmazott módszer alkalmasnak tűnik az adott típusú katéterek lehetséges gyenge pontjainak vizsgálatára. Orv. Hetil., 2014, 155(39), 1544–1548.

Restricted access

In the 20th century more than 60000 torsion balance measurements were made in Hungary. At present efforts are made to rescue the historical torsion balance data; today 24544 torsion balance measurements are available for further processing in computer database. Previously only the horizontal gradients of gravity were used by geophysicists, but there is a good possibility in geodesy to interpolate deflections of the vertical, and to compute geoid heights from curvature gradients of gravity. First the theory of the interpolation method is discussed, than results of test computations are presented. We have selected a test area where all kinds of torsion balance measurements are available at 249 points. There were 3 astrogeodetic points providing initial data for the interpolation, and 10 checkpoints for controlling the results. The size of our test area is about 750 km2 and the average site distance of torsion balance data is 1.5-2 km. The standard deviations of geoid height and deflection of the vertical differences at checkpoints were about ±1-3 cm, and ± 0.6'' respectively; which confirm that torsion balance measurements give possibility to compute very precise deflections of the vertical and local geoid heights at least for flat areas.

Restricted access

Transverse photothermal deflection spectroscopy(PDS) is applied for the determination of thermal diffusivities of solid surfaces. The theory of PDS is briefly recalled and some approximated analytical formulae concerning the transverse configuration are derived. In materials where the thermal diffusivity is smaller than that of the air, the dependence of the deflection angle on the displacement between pump and probe beams is shown to have a minimum that relates to the thermal diffusivity, thereby allowing its straightforward measurement. Measurements carried out on Al2O3 samples with different porosities at room temperature show a good agreement between experiment and theory.

Restricted access

Abstract  

In this paper different aspects that cause the so-called Groos droop, are investigated. We start from pure Bradfordian data (i.e. without a Groos droop) and discuss what actions can cause a deflection on the Bradford-Leimkuhler curve. It is, of course, well-known, that incompleteness of the data is one aspect, but we show that taking unions of pure Bradfordian bibliographies can also yield a bibliography with a Groos droop. As such, a Groos droop can always be expected in interdisciplinary bibliographies.In this way we suggest an explanation for the experimental differences between the micro-and macro-curves obtained byBonitz andSchmidt (Scientometrics, 4 (1982) 283.). In conclusion we may say that the Groos droop can be explained through Bradford's law and hence that they do not contradict each other.

Restricted access

Abstract  

Cobalt, copper and mercury were determined in Dead Sea surface water, sampled in February 1979 after the complete overturn of the lake. Co, Cu and Hg have been coprecipitated with lead-APDC and detected by X-ray spectrometry following neutron activation. The beta ray interference in the determination of Co by X-ray spectrometry has been eliminated by magnetic deflection. The results for Co (1.3 ppb) and Cu (2.0 ppb) were compared with those obtained by previous workers. The concentration of Hg (1.2 ppb) is the first reported value for this element in the Dead Sea.

Restricted access

In this paper the most relevant and an important aspect of the motorway crossings is presented. The composite bridges are, in comparison with steel bridges and concrete bridges, the most proper solution for motorway crossings because they are efficient, the erection time is shorter and the “in situ” operations can be minimized. The attention is focused on general design criteria of these crossings. Fabrication and erection methods have a big influence on the detailed design of the steel structure. The supporting steel members must be designed so that they do not interfere with the placing of concrete slab.

Restricted access

Abstract  

The structureless background at X-ray and low energy -ray region, resulting from bremsstrahlung due to the stopping of -radiations, causes serious problems in nuclear spectroscopy. In this study, in order to reduce the background and therefore to increase the sensitivity of the nuclear analytical technique and the number of elements observable, a methodology is developed to deflect the -particles by a magnetic field. The experimental setup consists of a permanent magnet /1 kG/, Ge/Li/ solid-state detector, and multichannel analyzer.

Restricted access

The aim of the paper is to point out the inevitability of the proof-load tests for the real and correct behavior of bridge structures in ultimate limit state and maximum allowable deformations in serviceability limit states. It is needed to point to the most consequences of resistance, reliability, durability and lifetime of the bridge structures. Using the proof-load tests for new bridges is prescribed by the Slovak standard STN 73 6209.

Restricted access

E. Analyzing the cracks and deflections of RC beams reinforced with GFRP and conventional steel bars , Master Thesis , University of Pristina, 2017 . [15

Restricted access