PROTON RADIOGRAPHY WITH THE PIXEL DETECTOR TIMEPIX

This article presents the processing of radiographic data acquired using the position-sensitive hybrid semiconductor pixel detector Timepix. Measurements were made on thin samples at the medical ion-synchrotron HIT [1] in Heidelberg (Germany) with a 221 MeV proton beam. The charge is energy by the particles crossing the sample is registered for generation of image contrast. Experimental data from the detector were processed for derivation of the energy loss of each proton using calibration matrices. The interaction point of the protons on the detector were determined with subpixel resolution by model fitting of the individual signals in the pixelated matrix. Three methods were used for calculation of these coordinates: Hough transformation, 2D Gaussian fitting and estimate the 2D mean. Parameters of calculation accuracy and calculation time are compared for each method. The final image was created by method with best parameters

Self-medication by orang-utans (Pongo pygmaeus) using bioactive properties of Dracaena cantleyi

This is the final version of the article. Available from Springer Nature via the DOI in this record.Animals self-medicate using a variety of plant and arthropod secondary metabolites by either ingesting them or anointing them to their fur or skin apparently to repel ectoparasites and treat skin diseases. In this respect, much attention has been focused on primates. Direct evidence for self-medication among the great apes has been limited to Africa. Here we document self-medication in the only Asian great ape, orang-utans (Pongo pygmaeus), and for the first time, to our knowledge, the external application of an anti-inflammatory agent in animals. The use of leaf extracts from Dracaena cantleyi by orang-utan has been observed on several occasions; rubbing a foamy mixture of saliva and leaf onto specific parts of the body. Interestingly, the local indigenous human population also use a poultice of these leaves for the relief of body pains. We present pharmacological analyses of the leaf extracts from this species, showing that they inhibit TNFα-induced inflammatory cytokine production (E-selectin, ICAM-1, VCAM-1 and IL-6). This validates the topical anti-inflammatory properties of this plant and provides a possible function for its use by orang-utans. This is the first evidence for the deliberate external application of substances with demonstrated bioactive potential for self-medication in great apes.We thank our financial supporters: the Wildlife Conservation Society, the U.S. Fish and Wildlife Service Great Apes Conservation Fund, Primate Conservation Inc., Foundation UMI – Saving of Pongidae, the L.S.B. Leakey Foundation, NERC (Natural Environmental Research Council) and the University of Exeter. L.R. and K.D. were supported by the Ministry of Education Youth and Sports, Czech Republic (grant LO1204 from the National Program of Sustainability and Agricultural Research). We are also very grateful to grant No. P505/11/1163 from The Grant Agency of The Czech Republic and to Prof. Jitka Ulrichová for the kind gift of HUVEC cells

Irradiation of luminescence dosimeters in pulsed mixed radiation fields

UHDpulse - Metrology for Advanced Radiotherapy using beams with Ultra-High Pulse Dose Rates is a European project aimed at developing novel dosimetry standards, as well as improving existing ones, for FLASH radiotherapy, very high energy electrons radiotherapy, and laser-driven medical accelerators. Within the scope of this project, Thermoluminescence (TL) and Optically Stimulated Luminescence (OSL) detectors are used to measure stray radiation fields. Experiments performed with conventional pulsed particle-beams allow to characterize the dosimeters in known and controllable radiation fields. In turn, this allows to develop models and predict their behavior in complex radiation fields, such as those at laser-driven and FLASH facilities. TL and OSL detectors were irradiated at the Microtron MT25 electron accelerator in Prague, Czech Republic. GAFChromicTM films and plastic nuclear track detectors were used to study the beam profile and the neutron background respectively. The responses of the different detector to the pulsed mixed radiation fields of the Microtron MT25 are compared among each other and presented in this paper

Influence of heat treatment mode on mechanical properties and microstructure of the OCTG

Tato diplomová práce se zabývá vlivem režimu tepelného zpracování na úroveň mechanických vlastností a struktury bezešvých trubek jakosti L80, jež byly válcovány na středisku Velkého Mannesmannu provozu Válcovny trub, Třineckých železáren, a.s. Sledovány byly hlavně mechanické vlastnosti zušlechtěných trubek, u nichž bylo důležité, aby odpovídaly požadavkům normy API 5CT. Dalšími předměty zkoumání, byla analýza mikročistoty, mikrostruktury a lomu.This thesis deals with the effects of thermal deformation conditions on the resulting structure and mechanical properties of seamless tubes from grade L80, which were rolled on the Mannesmann pipe rolling mill plant, as TŽ. The investigated parameters of this work were primarily mechanical properties of quenched and tempered tubes, which had to agree with requirements of API 5CT standard. Other studied subjects were analysis of microcleaness, microstructure and fracture analysis.636 - Katedra materiálového inženýrstvídobř

Hodnocení napadení vybraných odrůd tritikale houbovými patogeny v polních podmínách

The bachelor thesis presents results of small-scale experiments with winter triticale on the grounds of Mendel University in Žabčice. Triticale was sown in two variants. One variant was with application of fungicide and the other without. A total of 6 varieties were tested with 3 repetitions. The work compares the fungal pathogen attack on both variants and evaluates other parameters such as yield, 1000 seed weight, plant height, ears per m2, number of grains in the spike and weather conditions. Due to insufficient precipitation, fungal pathogens had poor conditions to spread and yield has been greatly reduced. Untreated variants were slightly infected with Powdery mildew and leaf blights

Sulphide stress cracking of welded joint made from supermartensitic steel

Import 02/11/2016Tématem této práce je hodnocení základového materiálu a svarového spoje supermartenzitické oceli vystavené sulfidickému praskání pod napětím. Tento typ korozního namáhání se zkouší podle normy NACE TM 0177. V této práci byla hodnocena supermartenzitická ocel 13Cr6Ni2,5Mo SSC metodou A. Všechny vzorky byly namáhány do porušení. Lomové plochy těchto vzorků byly podrobeny fraktografické analýze na řádkovacím elektronovém mikroskopu.The theme of this work is the evaluation of the base material and weld joint of supermartensitic steel exposed to sulphide stress cracking. This type of corrosion stress cracking is tested according to NACE TM 0177. In this study was evaluated Supermartensitic steel 13Cr6Ni2.5Mo by SSC method A. All samples were subjected to failure. The fracture surfaces of these samples were subjected fractographic analysis on a scanning electron microscope.636 - Katedra materiálového inženýrstvívelmi dobř

Vibrodiagnostics of gearing

Import 23/06/2008Prezenční340 - Katedra výrobních strojů a konstruováníNeuveden

Assessment of Tribodiagnostic Influence on Plant Productivity of Choice Company

Import 29/09/2010Tato diplomová práce se zabývá tribotechnickou diagnostikou vstřikovacích lisů v návaznosti na produktivitu provozu. V první části diplomové práce jsou uvedeny základní informace o podniku, provozovaných strojích a materiálech používaných ve výrobě. Důležitou součástí práce je popis hydraulických kapalin, včetně vhodných a prakticky používaných zkoušek. K provoznímu sledování bylo vybráno v podniku celkem šest lisů. Ve druhé části následuje vyhodnocení prováděných měření od roku 2005 do současnosti a ekonomické zhodnocení vlivu tribodiagnostiky. Na závěr je uvedeno několik návrhů pro budoucí provoz a zhodnocení celé práce.This thesis deals with the tribotechnic diagnosis of injection molding machines in response to productivity of an operation. In the first part of this thesis there are basic information about the company, operated machines and materials used in production. An important part of the thesis is a description of hydraulic fluids including use of appropriate and practical tests. In the company there were selected six molding machines to be monitored. The measurement of the evaluation from 2005 to the present and the economic evaluation of the effect of tribodiagnostics is described in the second part of the thesis. There were written suggestions for the future operations and the evaluation the whole thesis in the conclusion.340 - Katedra výrobních strojů a konstruovánívýborn

Effect of mass ratio and milling on compressive strength and corrosion resistance of blast-furnace slag/fly ash geopolymer activated by solid alkali activator

Fly ash and granulated blast-furnace slag can be considered "multifunctional waste." This study is focused on properties of a non-cement binder prepared from slag and fly ash activated by solid alkali activator. Fly ash was milled (2.5, 5.0, and 7.5 min) in order to increase its reactivity, and particle size distribution, specific surface area, and grain morphology were determined for all milled FA samples. Two GBFS +FA mixtures (70:30 and 85:15 w/w) were studied. Prepared mixtures were activated by solid alkali activator (Na2SiO3). Optimal weight ratios were calculated for CaO, SiO2, and Al2O3 components. Properties of the mixtures were studied in dependence on the GBFS:FA mass ratio and FA milling time (0-7.5 min). After 2 and 28 days of hydration, compressive strength of all mixtures exceeded 20 and 60 MPa, respectively. The 85:15 ratio led to generally higher compressive strength 108.3 MPa was reached after 90 days using FA milled for 7.5 min. Corrosion resistance was tested by exposing mixtures to distilled water, 0.5% HCl, and 3% Na2SO4 for 65 days, and evaluated by measuring changes in CS. Also the corrosion resistance was found higher (Na2SO4) than and comparable (HCl, water) to the 70:30 ratio. This study aims to show that GBFS +FA mixtures (70:30 and 85:15 w/w) activated by solid Na2SiO3 can achieve high CS and good corrosion resistance.Web of Science841974196