Sökning: "coupled pairs"

Visar resultat 1 - 5 av 17 uppsatser innehållade orden coupled pairs.

1. 1. Towards a setup for narrowband terahertz generation through difference-frequency mixing of chirped ultrashort pulses

   Master-uppsats, Lunds universitet/Atomfysik; Lunds universitet/Fysiska institutionen

   Författare :Isa Clementsson; [2023]
   Nyckelord :Physics and Astronomy;

   Sammanfattning : Terahertz radiation is a useful tool for inducing lower-energy excitations in matter, where it can be used to cause structural changes through direct interaction with the crystal lattice. Sub-picosecond optical pulses can be used to generate intense broadband terahertz pulses through optical rectification in nonlinear crystals, reaching peak electric fields of several MV/m and conversion efficiencies as high as a few percent. LÄS MER

3. 2. The design of a hydraulic equalizer bar for the feeding mechanism on forest harvester heads

   Uppsats för yrkesexamina på avancerad nivå, Luleå tekniska universitet/Institutionen för teknikvetenskap och matematik

   Författare :Arvid Söderlund; [2023]
   Nyckelord :Harvester; Harvester head; Komatsu Forest; Hydraulics; Equalizer bar; Parallellstag; Stag; Skogsmaskin; Skördare; Aggregat; Skog;

   Sammanfattning : Due to the importance of a correct tree placement and the wear that occurs to equalizer bars inharvester heads, Komatsu Forest AB in Umeå was interested if the bar could be replaced with ahydraulic system. According to Komatsu, the problems were that the equalizer bars that are responsible forsynchronizing the delimbing knives and feeding mechanism add weight, take up space and have atendency to break before their life expectancy. LÄS MER

4. 3. On a novel soliton equation, its integrability properties, and its physical interpretation

   Master-uppsats, KTH/Fysik

   Författare :Alexander Fagerlund; [2022]
   Nyckelord :Calogero-Moser systems; Conservation laws; Elliptic dynamics; Fluid dynamics; Hamiltonian mechanics; Hyperbolic dynamics; Integrability; Lax pairs; Pole ansatz; Riemann-Hilbert problems; Solitons; Bevarandelagar; Calogero-Mosersystem; Elliptisk dynamik; Fluiddynamik; Hamiltonmekanik; Hyperbolisk dynamik; Integrabilitet; Laxpar; Polansats; Riemann-Hilbertproblem; Solitoner;

   Sammanfattning : In the present work, we introduce a never before studied soliton equation called the intermediate mixed Manakov (IMM) equation. Through a pole ansatz, we prove that the equation has N-soliton solutions with pole parameters governed by the hyperbolic Calogero-Moser system. LÄS MER

5. 4. Improving BERTScore for Machine Translation Evaluation Through Contrastive Learning

   Master-uppsats, Uppsala universitet/Institutionen för lingvistik och filologi

   Författare :Oreen Yousuf; [2022]
   Nyckelord :machine translation; evaluation; BERTScore; contrastive learning; SimCSE; Hausa; Somali; Chinese;

   Sammanfattning : Since the advent of automatic evaluation, tasks within Natural Language Processing (NLP), including Machine Translation, have been able to better utilize both time and labor resources. Later, multilingual pre-trained models (MLMs)have uplifted many languages’ capacity to participate in NLP research. LÄS MER

7. 5. Episodic memory placebo: first try

   Master-uppsats, Lunds universitet/Institutionen för psykologi

   Författare :Pietro Rizzo; [2021]
   Nyckelord :classical conditioning; cognitive placebo; episodic memory; placebo effects; subliminal speech priming; Social Sciences;

   Sammanfattning : Literature shows that it is possible to induce placebo effects through classical conditioning. Literature also offers first evidence of a semantic memory retrieval enhancement effect elicited through a manipulation of expectancy, which may or may not fit the name of semantic memory retrieval placebo. LÄS MER