This thesis deals with design four-wheel crab of crane for overhead crane with capacity of 32,000 kg. Contains the functional calculations of steel rope , pulleys, cable drum. The integral part of the thesis constitutes the calculation and choice of driving mechanism for lifting, travel drive and motor drive pulley block hook rotation.

The topic of my Diploma’s thesis is a fatigue analyzing and judgmenting of main frame casting cat bridge crane. Use the beam model and thin shell model for comparising. The thesis contains of both of computation model. The loading states results of computation model are attachmented of this thesis. This diploma’s thesis was created for Kralovopolska a.s. company.

The diploma thesis deals with crab frame of bridge magnet crane with lifting capacity 15t used in steel mill for handling billets. Thesis contains strength analysis and fatigue strength check of crab frame based on ČSN EN 13001. Strength analyses are made by using beam and shell models of finite element method. The diploma thesis was carried out in cooperation with Královopolská a.s. company.

This master thesis deals with issue design of crab trolley. Concretely is acted about auxiliary crab trolley with required capacity 65 000 kg. This crab is on overhead crane, which is situated at hall of foundry. In particular chapters is processed design of lifting mechanism and travelling mechanism, which is amended to strength control of frame. This whole leads to output solutions, which is drawing documentation.

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In this thesis we present new results for the 99.9% confidence level flux upper limits on the pulsed VHE gamma ray signal coming from the Crab pulsar. In order to achieve optimum hadronic background suppression we implement a new neural network based selection technique and apply it to Cherenkov shower imaging data from the WHIPPLE 10m IACT telescope at Mount Hopkins Arizona. Special emphasis will be given to the fact that the neural network selector is trained with real data exclusively. An energy estimator for gamma ray induced extensive air shower events has been derived from Monte Carlo simulations using the Monte Carlo framework GrISU. This estimator, applied to the image data, serves as input to the neural set selector and is needed to determine the energy dependent flux upper limits. We compare our results to the results from previous studies and the performance of our neural network selection technique to the so-called Supercuts and Optimized Supercuts methods.The new flux upper limits and the new technique show the potential to settle the question about the production mechanism of pulsar radiation. However, the current analysis does not answer this question fully.

Polarisation of X-ray light is being investigated with polarimeters to extend the borders of what can be observed. Distant compact objects, such as pulsars, that are to small on the sky to be analysed with imaging can be investigated by analysing the polarisation of the emitted light. This can reveal physics previously hidden by their small nature. There are many models that aim to describe the polarisation of these compact objects to make sense of what is measured. Two examples are the outer gap and two-pole caustic models. The X-ray polarimeter XL-Calibur is a balloon-borne telescope capable of detecting X-rays in the $15-80$ keV energy range. In this thesis details on the polarisation of light, how it can be measured and some principles of X-ray polarimetery is discussed. A new feature in the simulation of XL-Calibur in Geant4 is also described and used to investigate the possibility for XL-Calibur to distinguish between different Crab pulsar polarisation models at different signal rates. The results show that signal rates under 2 Hz yield insufficient data to distinguish between the two models using the measured polarisation fraction and angle. For greater signal rates XL-Calibur does in fact differentiate between the models correctly. New methods for the statistical analysis of data can be explored to allow more data to be salvaged, even for low signal rates. The derivation of polarisation parameters is fixed through Stokes parameters in this thesis. / Polarisationen av röntgenljus undersöks med polarimetrar för att utvidga gränserna för vad som kan observeras. Avlägsna kompakta objekt, såsom pulsarer, som är för små och för långt borta på himlen för att analyseras med optiska metoder, kan undersökas genom att analysera polarisationen av det utstrålade ljuset. Detta kan avslöja fysik som tidigare var dold på grund av deras storlek. Det finns många modeller som syftar till att beskriva polarisationen av dessa kompakta objekt för att förstå vad som mäts. Två exempel är modellerna: outer gap och two-pole caustic. Röntgenpolarimetern XL-Calibur är ett ballongburet teleskop som kan detektera röntgenstrålning i energiområdet $15-80$ keV. I denna avhandling diskuteras detaljer om ljusets polarisation, hur det kan mätas och några principer för röntgenpolarimetri. En ny funktion i simuleringen av XL-Calibur i Geant4 beskrivs också. Den används för att undersöka möjligheten för XL-Calibur att särskilja mellan olika polariseringsmodeller för Krabbpulsaren vid olika signaltakter. Resultaten visar att för signaltakter under 2 Hz, blir datan otillräcklig för att särskilja mellan de två modellerna både för polarisationsgraden och vinkeln. För högre signaltakter kan XL-Calibur skilja mellan modellerna. Nya metoder för statistisk analys av data kan utforskas för att möjliggöra att mer data kan användas, även för låga signaltakter. I denna avhandling beräknas polarisationsparametrarna genom Stokesparametrarna.

The American horseshoe crab (HSC), Limulus polyphemus, is one of four species of horseshoe crabs found throughout the world, and the only one found in North America. It is an economically and ecologically important species throughout its native range from Maine to the Yucatan Peninsula. Harvested for fertilizer and livestock feed in the 19th century, the species is now harvested as bait for whelk and eel fisheries, and for their blood by the biomedical industry. The Atlantic States Marine Fisheries Commission (ASMFC) started to formally manage HSC in 1998 with its Interstate Fisheries Management Plan (IFMP). Unique emphasis and harvest limits have been placed on the Delaware Bay stock, as it is commercially exploited and a critical food source for the threatened red knot, Calidris canutus rufa. Previously, estimates of relative and total abundance of HSC in the Delaware Bay area were based on a design-based approach using a stratified random sampling design. In Chapter 1 of this work, I developed hurdle models for each of the six HSC demographic groups to standardize catch-per-unit-effort (CPUE) and estimate relative abundance using a model-based approach. It was determined that while the two approaches resulted in mostly convergent estimates of relative abundance, external factors such as month, time-of-day, and average depth have major effects on the observed CPUE of all demographic groups. Chapter 2 involved the development of hurdle models for the three species of bycatch frequently caught in our trawls, channeled whelk (Busysotypus canaliculatus), knobbed whelk (Busycon carica), and summer flounder (Paralichthys dentatus). It was found that channeled whelk relative abundance has been at a historical low since 2016, while summer flounder has been at a consistent high. Recent estimates of knobbed whelk relative abundance have been less variable than previously seen, with estimates since 2016 being similar to those seen before 2012. These results provide the first estimates for whelk population trends in the mid-Atlantic region and add to the growing knowledge of summer flounder relative abundance in the area. In Chapter 3, I applied the hurdle models developed in Chapter 1 to estimate the total abundance of HSC in the Delaware Bay area. For this work, I developed two spatio-temporal variograms to estimate bottom temperature and bottom salinity at unmeasured cells per month in the time series. The results showed that night estimates of total abundance were consistently higher than daytime estimates, and estimates from September or November resulted in the highest estimated catch for all demographic groups. The results suggest that when comparing September model-based estimates at night to those of the design-based approach, nearly a third of all previous design-based estimates significantly underestimated the total abundance of HSC in the Delaware Bay area. This result suggests that the ASMFC can recommend increased harvest limits for mature individuals if that action aligns with the goals of their adaptive resource management (ARM) framework. / Master of Science / The American horseshoe crab (HSC), Limulus polyphemus, is one of four species of horseshoe crabs found throughout the world, and the only one found in North America. It is an economically and ecologically important species throughout its native range from Maine to the Yucatan Peninsula. Harvested by the millions in the 19th century, the species is still harvested as bait for whelk and eel fisheries, and for their blood by the biomedical industry, on the order of hundreds of thousands. Formal management of HSC by the Atlantic States Marine Fisheries Commission (ASMFC) began in 1998, and allowable catch and landings have decreased since 1999. A strong focus has been placed on the Delaware Bay population, as it is the center of HSC abundance and provides a critical food source for the threatened red knot, Calidris canutus rufa, while also being commercially exploited. To effectively manage the species, it is important to accurately estimate relative and total abundance so that proper harvest limits can be set. Previously, estimates of relative and total abundance of HSC in the Delaware Bay area were based on a design-based approach using a stratified random sampling design. In Chapter 1 of this work, I developed hurdle models (a generalized linear model that models the probability of observations and the observed positive counts using two separate regression models that are then combined) for each of the six HSC demographic groups to remove the effect of external factors (year, latitude, longitude, depth [inshore/offshore], topography, average trawl depth, time-of-day, month, bottom temperature, bottom salinity, and distance from shore) on our observed catch-per-unit-effort (CPUE) and estimate relative abundance using a model-based approach. It was determined that while the two approaches resulted in mostly convergent estimates of relative abundance, factors like month, time-of-day, and average depth had major effects on the observed CPUE of all demographic groups. Chapter 2 involved developing similar hurdle models for three species of bycatch frequently caught in our trawls, i.e., channeled whelk (Busysotypus canaliculatus), knobbed whelk (Busycon carica), and summer flounder (Paralichthys dentatus). It was found that channeled whelk relative abundance has been at a historical low since 2016, while summer flounder has been at a consistent high. Recent estimates of knobbed whelk relative abundance have been less variable than previously seen, with estimates since 2016 being similar to those seen before 2012. These results provide the first estimates for whelk population trends in the mid-Atlantic region and add to the growing knowledge of summer flounder relative abundance in the area. In Chapter 3, I applied the hurdle models developed in Chapter 1 to estimate the total abundance of HSC in the Delaware Bay area. To do this, the bottom temperature and salinity had to be estimated for each geographic cell. This was accomplished by developing two spatio-temporal variograms which allowed me to estimate either variable at an unmeasured point and time based on its spatial and temporal distance from a measured value in a process known as spatio-temporal kriging. The results showed that night estimates of total abundance were consistently higher than daytime estimates and that estimates from September or November resulted in the highest estimated total abundance for all demographic groups. The results suggest that when using September model-based estimates at night to compare against the design-based approach, nearly a third of all previous design-based estimates significantly underestimated the total abundance of HSC in the Delaware Bay area. This outcome could justify ASMFC increasing recommended harvest limits for mature individuals if that action aligns with the goals of their adaptive resource management (ARM) framework.

No description available.

No description available.