17 research outputs found
Ammonium 5-Bromo-7-fluorobenzo-2-oxa-1,3-diazole-4-sulphonate: A New Fluorogenic Reagent for the Determination of Aminothiols by HPLC
Prognozowanie moment贸w zginaj膮cych w kluczu konstrukcji gruntowo-pow艂okowych budowanych jako przej艣cia ekologiczne dla zwierz膮t
The paper concerns soil-metal structures made of a thin shell (usually - corrugated steel) and soil backfill. During backfilling significant deformations of the structure can be observed (the upper part of the shell buckles and its width narrows). This phenomenon results in a subsequent prestressing effect during placing the backfill material above the crown of the structure. In the paper the method of bending moment determination in the crown of the structure, which is the main component affecting stresses in the steel shell, is proposed. The results obtained using in-situ method were compared with the results obtained using FEM software. The conclusions were drawn and the diagrams presenting the curvatures necessary to estimate values of the bending moment in the crown of the structure were obtained from the studies. Relations that could help in development of the methodology for determining internal forces in the crown of the structure of different geometry were found. The studies will help in designing of that type of structures and will allow to prevent critical forces in the steel shells during the erection process.Praca dotyczy konstrukcji gruntowo-pow艂okowych wykonanych z wiotkiej pow艂oki (przewa偶nie blacha falista) oraz zasypki gruntowej. Podczas zasypywania konstrukcja deformuje si臋 w znacznym stopniu (wypi臋trza si臋 g贸ra pow艂oki i zw臋偶a na szeroko艣ci). Zjawisko to przek艂ada si臋 na p贸藕niejszy efekt spr臋偶enia, gdy grunt uk艂adamy nad kluczem pow艂oki. W artykule zaproponowano metod臋 wyznaczania momentu zginaj膮cego w kluczu pow艂oki, kt贸ry jest g艂贸wnym czynnikiem wp艂ywaj膮cym na napr臋偶enia w stalowej pow艂oce. Wyniki otrzymane metod膮 in-situ zosta艂y por贸wnane z wynikami otrzymanymi w programie MES. Z bada艅 nad r贸偶nymi kszta艂tami pow艂ok wyci膮gni臋to wnioski oraz otrzymano krzywe potrzebne do szacowania moment贸w zginaj膮cych w kluczu pow艂oki. Znaleziono zale偶no艣ci kt贸re pomog膮 w opracowaniu metodyki wyznaczania si艂 wewn臋trznych w kluczu pow艂ok o r贸偶nej geometrii. Badania pomog膮 projektowa膰 tego typu konstrukcje oraz pozwol膮 na zapobieganie wyst臋powania krytycznych si艂 w pow艂oce w trakcie budowy
E18-2007-91 SIMULATIONS OF PROTON BEAM DEPTH-DOSE DISTRIBUTIONS
Rajcan M., Molokanov A. G., Mumot M. E18-2007-91 Simulations of Proton Beam Depth-Dose Distributions Proton beams are successfully used in radiotherapy. A correct modi藝cation of beam parameters enables to spare normal surrounding tissues from radiation action. Our work is focused on passive beam-shaping techniques, which are used to modify the proton beam properties. The beam passes through the scattering system, which consists of scattering materials, energy degraders, drift spaces and collimators. In order to model the proton beam transport through the scattering system, the new Monte Carlo (MC) computer code Track has been developed. The code Track can predict output proton beam parameters modulated by various system adjustments and helps to optimize them. It calculates a beam pro藝le, creates beam emittance diagram at a speci藝ed position of the system and predicts proton beam depthdose distribution in a water phantom. In addition it calculates beam losses on individual components. We present a physical model of the beam transport calculations and algorithm implemented in a code Track. We compared the Track code calculations of depth-dose distributions in water phantom with experimental data and with a set of MC calculations in the FLUKA code. The accuracy of simulation results and calculation time in Track code are observed