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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
111

Computer aided fatigue design

Yazdanpanah, Amir January 1990 (has links)
Today's competitive market requires engineers to produce reliable light weight products at low cost. This can be achieved by more effective use of computer aided engineering tools during early stages of the design process. A research programme has been undertaken to investigate the data requirements of integrating commercially available software packages (finite element analysis and fatigue life evaluation) to evaluate the integrity and durability of engineering components at the conceptual design stage. A real engineering component, in the form of a steering arm, supplied by a European truck manufacturer was used as a basis for the investigation. This is a typical vehicle component, in which, under service loading conditions, a multiaxial state of stress occurs. A geometric model of the component was created using the Prime "MEDUSA" software suite. The model was used to locate the boundary co-ordinates necessary for the development of a PAFEC Finite Element model. By imposing the conditions experienced during the service, the critical areas of the component were identified by analysing the F.E. model and a detailed description of the elastic stress/strain fields were also established. These were incorporated in an energy density approach and Neuber's uniaxial analysis to predict total local elastic/plastic strains at these critical- locations. These were compared with strain gauge measurements. The calculated results were used to plot a number of load/local strain calibration curves for the development of a load history, suitable for experimental fatigue life assessment. Fatigue crack initiation tests were performed on the steering arm using a computer controlled DARTEC multiaxial fatigue testing machine. Fatigue life assessment based on full service loading was carried out using a software package based on the critical location approach. A comparison of computerised, experimental and actual test circuit fatigue lives has been made. The work enabled a specification to be produced for the integration of the two items of software. This integrated software was developed by third parties and used to produce a computerised life map of the steering arm.
112

The long term effects of chiropractic adjustment therapy on the activity and strength of the biceps brachii muscle

Du Plessis, Louwrens Hermias 01 April 2014 (has links)
M.Tech. (Chiropractic) / Aim: The aim of this study was to determine the effects of chiropractic adjustment therapy (CAT) to the cervical spine on the reflex motorneuron excitability of C5 and C6 nerves on the biceps brachii muscle bilaterally. This study was also aimed at measuring the subsequent increase in strength of the biceps brachii muscle. Method: A selection of 30 participants, male or female and between the ages of 18 and 40 were recruited. Participants had to meet all the inclusion criteria and present with no contra-indications. Only one group was used as each participant served as their own control. Participants were seen seven times over a period of three weeks. The measurements were taken during the 1st, 4th and 7th consultations. On the 2nd, 3rd, 5th and 6th consultations only treatment was applied. On the 7th consultation only data was collected and no treatment was done. Results: Statistically significant improvement of dynamometry and electromyographic measurements were noted over the consultation periods on both sides. No conclusion could be made regarding the comparison of dynamometer and sEMG measurements of the biceps brachii between each consultation and between each side (left and right) over the study period. Conclusion: Based on the results obtained in this research it may be deduced that CAT may have an effect on the neurological system and further more an effect by increasing motorneuron excitability at sites distant to the spine itself. These results are important to the Chiropractic profession as it shows that CAT does not only produce a segmental response, but that there are wide spread effects on structures distant to the spinal column. The extent of the effects CAT can elicit on the nervous system requires further investigation.
113

A study of the taxonomy and some aspects of the ecology of marine ostracods in the plankton of Indian Arm, British Columbia

McHardy, Robert Alexander January 1961 (has links)
In 1960 a program was carried out to study some aspects of the distribution of planktonic ostracods in Indian Arm, an inlet of the coast of British Columbia. As a result, Paradoxostoma striungulum Smith, Phllomedes sp., Conchoecia elegans Sars, and C. pseudohamata n.sp. were collected, described and illustrated. Of these species, C. elegans and C, pseudohamata were abundant in the plankton, and provided material for the diagnoses of growth stages and for the comparison of the adult stages with those collected from other British Columbia inlets and from the Ocean Weather Station ”P” (50° N., 145° W.) The distributions of Conehoecia elegans and C. pseudohamata were studied in relation to temperature, salinity, oxygen, and light. The species were seldom found in water above the thermocline and halocline. The general distributions of Conehoecia elegans and C. pseudohamata may have been partly influenced by the mixing between water long resident in Indian Arm and water entering by way of the mouth of the Inlet. . Both species generally inhabited waters having temperatures from 7 to 9° C, and salinities from 26 to 27°/₀₀. Both occurred at depths greater than the shallow sill at the mouth; the one living more deeply seems to have been more restricted to the inlet than the other. Diurnal vertical migration differed for the two species except within the shallower part of the water column, where both seem to have descended in the presence of light. The time of maximal breeding seems to have been in the early summer for Conchoecia elegans and from early summer to early autumn for C. pseudohamata. Examination of stomach contents shows that both species were omnivorous. / Science, Faculty of / Zoology, Department of / Graduate
114

Women's Self-Management of Arm Morbidity After Breast Cancer: A Secondary Data Analysis

Samuel, Vicky Rosine January 2017 (has links)
Background: Arm morbidity continues to impact the lives of many breast cancer survivors long after acute treatments are completed. The most debilitating symptoms of arm morbidity are pain, lymphedema and limitation with range of motion (ROM). As a chronic condition, management of arm morbidity symptoms requires survivors to engage in self-management practices that alleviate symptoms. Objective: To explore self-management practices performed by breast cancer survivors, and the treatments women receive from healthcare practitioners in managing symptoms of arm morbidity. Methods: A secondary analysis of quantitative and qualitative data was undertaken. A descriptive correlational design was used to analyze data from breast cancer survivors (N = 740). Logistic regression identified variables related to self-management that were associated with pain, lymphedema and ROM limitations. A descriptive qualitative design was used to analyze data from a subset of participants (n = 40). Inductive content analysis approach was applied to develop codes, categories and themes related to how women self-manage arm morbidity symptoms and the treatments they received from healthcare providers to manage their arm morbidity. Results: Participants reported ongoing symptoms of pain (24%), lymphedema (21%), and range of motion limitation (34%) 30 to 36 months post-surgery. Pain was associated with experiencing swelling, taking pain medications, and discussing treatments for pain. Lymphedema was associated with swelling and receiving treatment for pain. ROM limitations were associated with swelling, receiving treatment for pain and taking pain medication. Two overarching qualitative themes emerged: 1) physical symptoms self-management, and 2) psychosocial self-management of uncertainty. Themes for treatments options included: rehabilitation and taking medications. Conclusion: Findings highlight that women living with symptoms of arm morbidity require ongoing monitoring and support for self-management, and there is a need for multidisciplinary approaches. Self-management practices reported are in line with the current lymphedema guidelines, however, the complexities associated with self-management practices can be burdensome to women. Chronic pain and ROM limitation necessitates further investigation to understand their cause and develop management strategies. Oncology nurses are well positioned to implement survivorship care plans that address survivorship needs with multidisciplinary teams and primary healthcare practitioners when women with breast cancer transition from acute cancer care to home. Future research is needed to provide an in depth understanding of self-management of arm morbidity in breast cancer survivors.
115

Návrh pulzního generátoru pro laserovou spektroskopii / Design of pulse generator for laser spectroscopy

Cebo, Patrik January 2020 (has links)
This diploma thesis deals with the design of a precise multi-channel pulse generator for the synchronization of laser-induced breakdown spectroscopy (LIBS) instrumentation. The thesis reflects current state-of-the-art solutions in communication and trends in the field of laser spectroscopy. Moreover, the device is based on the modern implementation of embedded devices using C and C++ programming languages using the Ethernet for communication. The communication with the control software is provided via the SDD protocol; designed at CEITEC BUT. Finally, the data of the SDD protocol are sent by the hypertext transfer protocol (HTTP) protocol in native file format (JSON). This thesis brings the synchronization of the 10 devices by precision timing.
116

Návrh nápravy pro autonomní elektrický minibus / Axle design for autonomous electric minibus

Müller, Viktor January 2020 (has links)
This thesis deals with an axle design for an autonomous minibus. The theoretical part is about axles then the next one goes over the given parameters. Following with a selection of suitable parts for use and designs of parts for production. This chapter is also about geometry and driving characteristics analyzation. The next chapters are devoted to the calculations of the loads on the lower arm, its design and static analysis. The last chapter combines all the parts together into a conceptual design.
117

Systém pro monitorování a nastavení signálového procesoru v digitálním reproduktorovém systému / System for monitoring and setup of signal processor in digital loudspeaker system

Laník, Jakub January 2013 (has links)
This project solves teoretical design of digital reproductor system and controlling GUI software. This digital system is composed of one master unit, which digitalize different audio sources and stream them by ethernet to slave units. The controlling software is be able to set and monitor the audio system.
118

Návrh embedded systému / Embedded system design

Gábor, Tomáš January 2015 (has links)
This work deals with application of ARM based development board as platform for remote controlling of attached peripherals. It describes practical experiences with A20- OLinuXino-Micro-4GB development board and it’s available options. Used hardware and testing peripherals are described in the next part along with programming of the software for web interface and for communication in between development board and peripherals. The second half of this document describes design process of own embedded system beginning with schematic, continuing with PCB wiring. Each step of PCB wiring process is described with required details in text, including crucial connections between processor and memory chips. The last part contains details about setting a calibration of memory chips and designing optional peripheral modules.
119

Optické snímání a analýza bytových měřidel / Optical Recognition and Analysis for Home Metering

Machala, Petr January 2015 (has links)
The topic of this master’s thesis is a study and solution of problems regarding an optical recognition and home metering analysis for the following recording and statistical processing. For this required application a STMicroelectronics 32F429IDISCOVERY development board with ARM Cortex-M4 microcontroller and OmniVision OV7670 camera module was used, where a required firmware was implemented. This thesis therefore generally represents a complex solution from acquisition of images by used camera module to final analysis and data processing and building a functional prototype of the proposed sensor system.
120

Využití ARM procesorů v řídicím systému vytápění

Steiger, Václav January 2017 (has links)
Steiger, V. Usage of ARM processors in heating control system. Diploma thesis. Brno: Mendel University, 2016. This thesis aims to simplify the process of controlling heating and cooling systems with standardised, widely accessible computers on purpose of integration into smart home systems. In theoretical part, heating systems available on the market are reviewed, mainly with focus on communication interfaces and protocols in use. Then the specifications of one of the most widely used protocol in heating systems communication OpenTherm, and one of the most widely used protocols in industrial computers communication RS485 Modbus are examined. Theoretical part also contains a description of integrated development environment and platform-specific development properties for STM32 ARM platform. In desing and Implementation is described RS485 Modbus OpenTherm converter firmware written in C language. Behaviour of the converter is then tested in practise.

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