There has been much concern as to the validity of the Graduate Record Examination in determining the ability of a student to do effective graduate work. Some hold that the Profile score is a necessary index of a person’s ability to do graduate work, while others believe there is no close relationship between the two There is also a feeling that students who have been out of school for many years are at a disadvantage when taking the Graduate Record Examination Profile Tests, and that some departments prepare their students better for the tests. The lack of agreement as stated above led to the following problems: (1) What relationship is there between a student’s grade-point average and this total score on the Graduate Record Examination Profile Tests?; (2) What apparent variations are there between the scores of men and women; the scores of students majoring in the departments of education, history, literature, fine arts, psychology, and science; and the number of years since receiving the A.B. in relation to the scores obtained on Graduate Record Examination Profile Tests?

This diploma thesis deals with examination of a steel construction of an overhead travelling crane with a span of 28 metres, lifting capacity of 18 tons and maximum lifting height of 6.5 metres. The crane will be installed in a hall. Solution of this project contains calculation of load and examination of the crane construction with fatigue under the Czech standard ČSN 27 0103 and the European standard EN 13001 and comparison of calculations under both of the technical norms.

This diploma thesis deals with the experiment of welding galvanized sheets using fiber laser. The experiment is based on testing of welds lap joints with different gap between the welded parts. Theoretical part of this diploma thesis describes the principles and different types of lasers, laser welding technology, welding defects, galvanizing and inspection of welded joints. In the experimental part of the thesis welding tests and analysis of the results of the experiment have been realised and evaluated.

Friction stir welding (FSW) is an advantageous solid-state joining process, suitable for many materials in the energy, aerospace, naval and automotive industries. Like all other welding processes, friction stir welding requires non-destructive evaluation (NDE). The time and resources to preform NDE is expensive. To reduce these costs, nontraditional NDE methods are being developed for FSW. Spectral based defect recognition uses the forces during the welding process to validate weld quality. Although spectral NDE methods have shown promise as an alternative NDE processes, many research welding speeds do not correspond to manufacturing speeds, nor do they explain the relationship between the spectral data and the process. The purpose of this work is to explore the possibility of acquiring additional information about the defect. Namely the defect’s type, location, and magnitude. In this study, welds with “wormhole” defects were produced at 2000, 2500 and 3000 mmpm in 5754 aluminum. The welding process forces and torque were measured and analyzed spectrally. The welded plates were then imaged with x-ray photography, a validated NDE method. It was found that low frequencies (0 – 4 Hz) in the y & z force signals correlate with defect presence in high speed FSW. In addition, the strong correlation between the spectral data and the presence of a defect allowed for defect magnitude predictions. Linear fits were applied to the defect measurements and the spectral data. Large error inhibits the wide use of this prediction method.

Den här undersökningen gjorde i samband med ett försök i lärarutbildningen, där studenterna själva fick välja examinationsform i en kurs. Dels fick de fyra olika examinationsformer angivna, men de erbjöds även att själva föreslå hur de skulle bli examinerade. Syftet var att undersöka hur studenterna såg på sin egen bedömning och examination, och hur de valde examinationsform utifrån detta. Som metod valdes att studenterna, efter att ha genomfört kursen med den examination de valt, fick bevara en enkät om tidigare erfarenheter av examinationer, om sin syn på dessa och på bedömningar, om vilka examinationsformer/aktiviteter de såg som mest nyttiga i sina egna lärprocesser, och om vilken examinationsform de valde och varför. Resultatet visar att även om studenterna såg examinationen som ett lärtillfälle och uppskattade möjligheten att fritt välja examinationsform, så valde de inte examinationsform efter hur de tillmätte olika former av uttryck/aktiviteter nytta i sin lärprocess. Bara två av de 119 studenter som besvarade enkäten valde att själva formulera sin examination. Snarare valde studenterna den examinationsform de ansåg sig ha lättast att formulera sig genom och få högst betyg i. Fokus för examinationen kom alltså att hamna där istället för på den egna lärprocessen, vilken ofta upplevs som desto mer frustrerande och arbetsam ju gynnsammare den är. I diskussionen tas upp frågan om huruvida det är bra om studenterna själva får välja hur de ska examineras, och hur man i så fall kan påverka dem att välja de examinationsformer som utvecklar respektive individ bäst.

Magister Scientiae Dentium - MSc(Dent) / Cephalometric landmark detection is important for accurate diagnosis and treatment planning. The most common cause of random errors, in both computer-aided cephalometry and manual cephalometric analysis, is inconsistency in landmark detection. These methods are time-consuming. As a result, attempts have been made to automate cephalometric analysis, to improve the accuracy and precision of landmark detection whilst also minimizing errors caused by clinician subjectivity.This mini-thesis aimed to determine the precision of two cephalometric landmark identification methods, namely an artificial intelligence programme (BoneFinder®) and a computer-assisted examination software (Dolphin ImagingTM).

Friction stir welding (FSW) is an advantageous solid-state joining process, suitable for many materials in the energy, aerospace, naval and automotive industries. Like all other welding processes, friction stir welding requires non-destructive evaluation (NDE). The time and resources to preform NDE is expensive. To reduce these costs, nontraditional NDE methods are being developed for FSW. Spectral based defect recognition uses the forces during the welding process to validate weld quality. Although spectral NDE methods have shown promise as an alternative NDE processes, many research welding speeds do not correspond to manufacturing speeds, nor do they explain the relationship between the spectral data and the process. The purpose of this work is to explore the possibility of acquiring additional information about the defect. Namely the defect’s type, location, and magnitude. In this study, welds with “wormhole” defects were produced at 2000, 2500 and 3000 mmpm in 5754 aluminum. The welding process forces and torque were measured and analyzed spectrally. The welded plates were then imaged with x-ray photography, a validated NDE method. It was found that low frequencies (0 – 4 Hz) in the y & z force signals correlate with defect presence in high speed FSW. In addition, the strong correlation between the spectral data and the presence of a defect allowed for defect magnitude predictions. Linear fits were applied to the defect measurements and the spectral data. Large error inhibits the wide use of this prediction method.

京都大学 / 0048 / 新制・課程博士 / 博士(エネルギー科学) / 甲第20484号 / エネ博第353号 / 新制||エネ||70(附属図書館) / 京都大学大学院エネルギー科学研究科エネルギー変換科学専攻 / (主査)教授 木村 晃彦, 教授 星出 敏彦, 教授 今谷 勝次 / 学位規則第4条第1項該当 / Doctor of Energy Science / Kyoto University / DFAM

京都大学 / 0048 / 新制・課程博士 / 博士(社会健康医学) / 甲第21266号 / 社医博第89号 / 新制||社医||10(附属図書館) / 京都大学大学院医学研究科社会健康医学系専攻 / (主査)教授 辻川 明孝, 教授 中山 健夫, 教授 小杉 眞司 / 学位規則第4条第1項該当 / Doctor of Public Health / Kyoto University / DFAM

För att ta reda på i vilket utsträckning digitala prov kan användas i ämnet matematik på gymnasiet har en studie gjorts, där fokus legat på ämnesplanens olika förmågor, vilka utmaningar som är förknippade med denna examinationsform samt hur det kan påverka elevernas motivation. Studien har en kvalitativ inriktning och består av en inledande dokumentanalys, implementation och genomförande av prov på dator, samt utvärdering av resultat. Genomförandet gjordes med en grupp elever på det naturvetenskapliga programmet, vilka fick lösa uppgifter digitaliserade från ett nationellt prov, och sedan fylla i en enkät som utvärdering. Tolkningen av resultaten var att examination av förmågorna begrepp, procedur och problemlösning var digitaliserbar i hög utsträckning, medan modellering och kommunikation var de mest problematiska. Vidare kunde några utmaningar fastställas och bland dessa var dels behovet av att minska tidsåtgången och dels att hitta ett lämpligt program som hanterar matematiska uttryck utan att vara för komplicerat, men även symbolhantering och grafritning generellt. I studien finns belägg för att digitaliserade prov i matematik kan ha positiva effekter på elevernas motivation.