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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.
171

A geometric study of Dynkin quiver type quantum affine Schur-Weyl duality / ディンキン箙に付随する量子アフィン型シューア・ワイル双対性の幾何学的研究

Fujita, Ryo 25 March 2019 (has links)
京都大学 / 0048 / 新制・課程博士 / 博士(理学) / 甲第21535号 / 理博第4442号 / 新制||理||1638(附属図書館) / 京都大学大学院理学研究科数学・数理解析専攻 / (主査)准教授 加藤 周, 教授 重川 一郎, 教授 並河 良典 / 学位規則第4条第1項該当 / Doctor of Science / Kyoto University / DFAM
172

Assessment of the ballistic performance of compositional and mesostructural functionally graded materials produced by additive manufacturing

Daugherty, Timothy J. 06 August 2020 (has links)
No description available.
173

Funkční pěny s gradientem hustoty / Functional foams with densit ygradient

Svatík, Juraj January 2019 (has links)
Vycházíme-li z lehčených přírodních materiálů, lze od porézních materiálů s gradientem porozity očekávat mechanické vlastnosti nadřazené konvenčím polymerním pěnám, a to díky jejich specifické architektuře. Tyto vlastnosti umožňují použití lehčených materiálů jako strukturních prvků. V této práci je popsaná příprava gradientních porézních materiálů pomocí laminování a/nebo 3D tisku. Provedeny byly statické a dynamické mechanické testy na obou kvazi homogenních a gradientně porézních pěnách poskytující experimentální podklad pro hypotézu deformační odezvy plynoucí ze strukturní architektury. Data se interpretovala užitím zavedených teoretických modelů. Naše výsledky vedly k závěru, že tyto teoretické modely odvozené od pěn s pravidelnou strukturou není vhodné aplikovat pro pěny s gradientem porozity, protože prokazují podstatně lepší mechanické vlastnosti než homogenně porézní pěny.
174

The effect of bedding errors on the accuracy of plate load tests

Barnard, Hendrik Francois Taljaard January 2013 (has links)
A series of plate load tests were conducted at the experimental farm of the University of Pretoria. The test areas were levelled by means of three surface preparation methods namely, i) a thin layer of plaster of Paris; ii) a thin layer of well-graded sand and iii) by using only hand tools. In addition, a modified plate load test was designed to eliminate the effect of bedding errors that occur during these tests. Telescopic probes were used to measure the relative displacement at two points below the centre of the plate. The main objective of this research project was to first quantify the bedding errors that occur during plate load tests. Secondly, to evaluate the three different surface preparation methods used in plate load tests to achieve a levelled and smooth test surface, and lastly to evaluate the effectiveness of using telescopic probes in routine plate load tests to eliminate the effects of bedding errors. The stiffness values, determined from the vertical displacement of the plate, were compared with the internal stiffness values determined by means of the telescopic probes. All stiffness values were compared with continuous surface wave (CSW) measurements performed on the same material. The test apparatus, methods and results are discussed in this dissertation. To my / Dissertation (MEng)--University of Pretoria, 2013. / gm2014 / Civil Engineering / unrestricted
175

Computational Ideal Theory in Finitely Generated Extension Rings

Apel, Joachim 15 July 2019 (has links)
One of the most general extensions of Buchberger's theory of Gröbner bases is the concept of graded structures due to Robbiano and Mora. But in order to obtain algorithmic solutions for the computation of Göbner bases it needs additional computability assumptions. In this paper we introduce natural graded structures of finitely generated extension rings and present subclasses of such structures which allow uniform algorithmic solutions of the basic problems in the associated graded ring and, hence, of the computation of Gröbner bases with respect to the graded structure. Among the considered rings there are many of the known generalizations. But, in addition, a wide class of rings appears first time in the context of algorithmic Gröbner basis computations. Finally, we discuss which conditions could be changed in order to find further effective Gröbner structures and it will turn out that the most interesting constructive instances of graded structures are covered by our results.
176

“IN THAT CASE I CHOOSE TO WORK WITH SHORT STORIES” : A study about how English short stories are taught by nine upper secondary school teachers in Sweden and said teachers’ attitudes towards short stories

Engwers, Anton January 2020 (has links)
Reading English literature can help learners of English as a foreign language (EFL) to develop their reading ability as well as other language skills. Reading can also have other benefits for EFL students such as learning about the target language’s culture or an English variety in written form. This present study investigates what types of literature are used in Swedish upper secondary school, the EFL teachers’ attitudes towards short stories compared to simplified novels/graded readers and their preferred assessment methods associated with literature teaching. The majority of the teachers that took part in this survey have a positive attitude towards short stories and use them in their EFL classes. The results also show that after the students have completed reading a short story, most of the teachers that participated in this survey preferred to combine examination methods such as a group discussion with a written test.The title of this paper comes from one of the informants’ comments when asked if she would rather use a short story or a graded reader in her English class. This informant had used graded readers in her English language classroom, but she and everyone that took part in this survey chose short stories over graded readers.
177

Vibration Characteristics of Axially Graded Viscoelastic Beams

Heras Segura, Mariona 06 May 2019 (has links)
No description available.
178

III-Nitride Transistors for High Linearity RF Applications

Sohel, Md Shahadat Hasan January 2020 (has links)
No description available.
179

Application of Adaptive Filters in Processing of Solar Corona Images / Application of Adaptive Filters in Processing of Solar Corona Images

Druckmüllerová, Hana January 2014 (has links)
Fotografování sluneční koróny patří mezi nejobtížnější úlohy astrofotografie a zároveň je jednou z klíčových metod pro studium koróny. Tato práce přináší ucelený souhrn metod pro pozorování sluneční koróny pomocí snímků. Práce obsahuje nutnou matematickou teorii, postup pro zpracování snímků a souhrn adaptivních filtrů pro vizualizaci koronálních struktur v digitálních obrazech. Dále přináší návrh nových metod určených především pro obrazy s vyšším obsahem šumu, než je běžné u obrazů bílé koróny pořízených během úplných zatmění Slunce, např. pro obrazy pořízené pomocí úzkopásmových filtrů. Fourier normalizing-radial-graded filter, který byl navržen v rámci této práce, je založen na aproximaci hodnot pixelů a jejich variability pomocí trigonometrických polynomů s využitím dalších vlastností obrazu.
180

Regulation of Oxygen Transport in Potassium-Oxygen Batteries Using Conducting Polymers

Gilmore, Paul 04 September 2019 (has links)
No description available.

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