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Visar resultat 1 - 5 av 151 avhandlingar som matchar ovanstående sökkriterier.

1. 1. Diagnosing Sharing Anxiety

   Författare :Sigma Dolins; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; ridehailing; sharing anxiety; shared autonomous vehicles; ridepooling; on-demand transport; qualitative methods; shared autonomous public transport; autonomous vehicles; public transport;

   Sammanfattning : Numerous studies indicate that the potential of autonomous vehicles (AVs) to reduce greenhouse gas emissions, reduce traffic congestion, and increase mobility access can only be fully realized through fleets of vehicles being used for shared rides, also known as dynamic ridepooling. This has the potential for transforming the public transport industry, as well as how transportation functions in urban and rural contexts. LÄS MER

3. 2. Continuous-Time Delta-Sigma Modulators for Wireless Communication

   Författare :Mattias Andersson; Institutionen för elektro- och informationsteknik; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; return-to-zero; A D converter; loop delay; delta-sigma; ADC; CMOS; STF; continuous-time; sigma; delta; filtering; CT; RZ;

   Sammanfattning : The ever increasing data rates in wireless communication require analog to digital converters (ADCs) with greater requirements on speed and accuracy, while being power efficient to prolong battery life. This dissertation contains an introduction to the field and five papers that focus on the continuous-time (CT) Delta-Sigma modulator (DSM) as ADC. LÄS MER

4. 3. Wideband Sigma-Delta Modulators

   Författare :Xiaolong Yuan; Svante Signell; Jakob Wikner; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; sigma-delta modulator; feedforward; reconfigurable; quadrature bandpass filtering; Electronics; Elektronik;

   Sammanfattning : Sigma-delta modulators (SDM) have come up as an attractive candidatefor analog-to-digital conversion in single chip front ends thanks to the continuousimproving performance. The major disadvantage is the limited bandwidthdue to the need of oversampling. LÄS MER

5. 4. Going Round in Circles : From Sigma Models to Vertex Algebras and Back

   Författare :Joel Ekstrand; Maxim Zabzine; Anton Alekseev; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Chiral de Rham complex; Conformal field theory; Poisson vertex algebra; Sigma model; String theory; Vertex algebra; Theoretical Physics; Teoretisk fysik;

   Sammanfattning : In this thesis, we investigate sigma models and algebraic structures emerging from a Hamiltonian description of their dynamics, both in a classical and in a quantum setup. More specifically, we derive the phase space structures together with the Hamiltonians for the bosonic two-dimensional non-linear sigma model, and also for the N=1 and N=2 supersymmetric models. LÄS MER

7. 5. Silicon Carbide Sigma-Delta Modulatorfor High Temperature Applications

   Författare :Ye Tian; Carl-Mikael Zetterling; Ana Rusu; Jerzy Dabrowski; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; silicon carbide SiC ; bipolar; sigma-delta; data conversion; OpAmp; integrated circuit IC ; Informations- och kommunikationsteknik; Information and Communication Technology;

   Sammanfattning : .... LÄS MER