Accuracy of dose planning for prostate radiotherapy in the presence of metallic implants evaluated by electron spin resonance dosimetry

Radiotherapy is one of the main approaches to cure prostate cancer, and its success depends on the accuracy of dose planning. A complicating factor is the presence of a metallic prosthesis in the femur and pelvis, which is becoming more common in elderly populations. The goal of this work was to perform dose measurements to check the accuracy of radiotherapy treatment planning under these complicated conditions. To accomplish this, a scale phantom of an adult pelvic region was used with alanine dosimeters inserted in the prostate region. This phantom was irradiated according to the planned treatment under the following three conditions: with two metallic prostheses in the region of the femur head, with only one prosthesis, and without any prostheses. The combined relative standard uncertainty of dose measurement by electron spin resonance (ESR)/alanine was 5.05%, whereas the combined relative standard uncertainty of the applied dose was 3.35%, resulting in a combined relative standard uncertainty of the whole process of 6.06%. The ESR dosimetry indicated that there was no difference (P>0.05, ANOVA) in dosage between the planned dose and treatments. The results are in the range of the planned dose, within the combined relative uncertainty, demonstrating that the treatment-planning system compensates for the effects caused by the presence of femur and hip metal prostheses.

Vibration analysis of a power take-off line

Gear rattle is a phenomenon that occurs when idling or lightly loaded gears collide due to engine’s torque fluctuations. This behaviour is related to vibration behaviour of the transmission system. Aim of this master’s thesis is to evaluate Adams and Adams/Machinery as a simulation tools for modelling the rattle e ect in a transmission system. A case study of tractor’s power take-o driveline, suspected to be prone to rattle, is performed in this work. Modelling methods used by Adams in this type of study are presented in the theory section while simulation model build with the software during this work is presented in the results. The Machinery toolbox is used to create gears and bearings while other model components are created with standard Adams tool set. Geometries and excitations are exported from other softwares. Results were obtained from multiple variations of a base model. These result sets and literature review suggest that Adams/Machinery may not be the most suitable tool for rattle analysis. While the system behaviour was partially captured, for accurate modelling user-written routines must be used which may be more easily performed with other tools. Further research about this topic is required.

Liiketoimintayksikön materiaalihallinnan nykytila ja sen tehostaminen materiaalien suoratoimituksilla

Tutkimuksen tarkoituksena on tutkia kansainvälisesti toimivan konserniyrityksen yhden liiketoimintayksikön materiaalinhallinnan ja siihen liittyvien toimintojen nykytilaa. Lisäksi tutkimuksessa selvitetään, miten materiaalinhallintaa varastoinnin osalta voidaan kehittää suoratoimitusmallin periaatetta hyödyntäen ja mitä säästöpotentiaaleja tämän kaltaiseen malliin liittyy kohdeorganisaation toimintaympäristö huomioiden. Tutkimuksen teoriaosion lähdeaineisto koostuu materiaalinhallinnan perusteosten lisäksi tieteellisistä artikkelijulkaisuista. Käytännönosuuden aineisto pohjautuu kohdeorganisaatiossa käytyihin keskusteluihin, tuotannonohjausjärjestelmästä saatuun tietoon ja omiin havaintoihin. Nykytilanteen analyysissä selvisi, että kohdeorganisaation varastointiin liittyy tehostamispotentiaalia erityisesti tila-, käsittely, ja työkustannusten osalta. Kohdeorganisaation varastoinnin tehostamista tutkittiin suoratoimitusmallin avulla. Suoratoimitusmallissa materiaalit eivät kierrä kohdeorganisaation pitämän välivaraston kautta, vaan ne toimitetaan toimittajan tiloista suoraan tuotannon välittömään tarpeeseen. Mallin avulla voidaan jakaa toimittajien kanssa sellaisia resursseja, joita molempien toiminta vaatii ja täten vapauttaa nykyistä varastointitilaa ja keventää sisäisen logistiikan kuormaa. Suoratoimitusmallin liittyvien hyötyjen kannalta on oleellista, että malliin valitaan sellaiset materiaalit, jotka sisältävät eniten potentiaalia niin säästö- kuin soveltuvuusnäkökulmasta. Valittujen kriteerien avulla kohdeorganisaation hankkimista materiaaleista löydettiin joukko materiaaleja, joiden avulla pystyttiin osoittamaan, että suoratoimitusmallin avulla on mahdollista saavuttaa kustannussäätöjä varastoinnin osalta.

Getting Off the Water

Brock's Junior Varsity crew of '76 pictured looking appropriately worn out after practice. Their shirts read "Brock Crew '76: Up Y'Oars" Cox: Kari Syri, Stroke: Ed Cooling, Ralph Martens, Paul Kivell, Don Rickers, Sean Stackwood, Clark Wochis, Jack Pyke, Bow: Bruce Petrie, Coach (the leg on the boat): Tony Biernacki.

Pushing Off

Women's eight getting ready to push off form the dock.

Academic Staging Building

A view from the main parking lot near the time of completion of the complex.

Academic South and North ( September 2002)

The Academic South and Academic North buildings are located at the west end of campus. The 80 000 square-foot facilities include the Computer Commons, several multimedia lecture halls, office space, state-of-the-art labs, a food court, and student meeting space. The complex included some of the most modern technology, including broadband Internet video conferencing that enabled real-time visual contact between professors, students, and researchers from around the world.

In distrust we trust : analysis of academic apocalypse

The paper concentrates on trust as a research topic that receives increasing attention from the side of different social disciplines. The author of this thesis attempts to identify the reasons of this phenomenon, as well as the decline in usage of the concepts conveying a congenial idea, such as, solidarity, cooperation, social cohesion, social capital or connectedness. The key hypotheses, such as paradigmatic change within the social sciences, emergence of risk society, proliferation of the postmodem condition, new infonnation and communication technologies and the crisis of democracy are considered through the works of the authors who now mainly responsible for the shaping of the discourse of trust. The concepts of Luhmann, Putnam, Sztompka, Fukuyama and Hardin are analyzed from an epistemological viewpoint in its ontological and political implications. The primary goal of the paper is to overview trust from the methodological viewpoint, illustrating the limitations of the concept as a research strategy as weII as it advantages in the epoch when the social sciences acquire a status of moral disciplines.