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Showing result 1 - 5 of 7 essays matching the above criteria.

  1. 1. Non-destructive Evaluation of Ultrasound Contrast Agent

    University essay from KTH/Skolan för kemi, bioteknologi och hälsa (CBH)

    Author : Wendi Löffler; [2019]
    Keywords : ultrasound; microbubbles; contrast agent; attenuation; phase velocity;

    Abstract : Clinical ultrasound imaging techniques can be greatly improved by the use of ultrasound contrast agents (UCAs). While microbubbles (MBs) without shell are unstable and cannot be used for practical applications,a shell produced from biocompatible polyvinylalcohol (PVA) significantly improves chemical versatility and stability. READ MORE

  3. 2. Direction Finding : Determine the direction to a transmitter with randomly placed sensors

    University essay from KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Author : Fernando Franzén; [2019]
    Keywords : Direction Finding; TDOA; MUSIC; UCA; Random Array; DOA;

    Abstract : There are a lot of stand-alone and mobile platforms using transmitters today. Some want to be found while others do not. In our modern society there is a great demand of mobility and communication abilities. This means that several mobile platforms could potentially carry a sensor to record incoming signals to be used in Direction Finding. READ MORE

  4. 3. The effect of environmental and disturbance factors on the presence of different crab species in Pranburi Forest Park, Thailand

    University essay from SLU/Dept. of Ecology

    Author : Johanna Rosenquist; [2017]
    Keywords : mangrove forest; Thailand; biodiversity; canopy shade; water depth; human disturbance; Brachyura; Scylla serrata; Uca vocans; Sesarma mederi; Perisesarma bidens;

    Abstract : The mangrove forest is one of the world’s most threatened ecosystems today and they have decreased significantly in Southeast Asia over the past 40 years. Brachyura (crabs) are important for this ecosystem and they function as ecosystem engineers with their burrowing activities that affects the soil and carbon uptake. READ MORE

  5. 4. Massive MIMO Channel Modeling

    University essay from Lunds universitet/Institutionen för elektro- och informationsteknik

    Author : Yongchun Wang; Xin You; [2015]
    Keywords : massive MIMO; 5G; channel modeling; the Kronecker model; the Weichselberger model; capacity; sum-rate; singular value spread; the Random Cluster Model; cluster; spatial correlation; large-scale fading; Technology and Engineering;

    Abstract : Massive MIMO has attracted many researchers’ attention as it is a promising technology for future 5G communication systems. To characterize the propagation channels of the massive MIMO and to evaluate system performance, it is important to develop an accurate channel model for it. In this thesis, two correlative models, i.e. READ MORE

  6. 5. Impact of Mutual Coupling among Antenna Arrays on the Performance of the Multipath Simulator System

    University essay from Avdelningen för elektronik, matematik och naturvetenskap

    Author : Dhayalini Ramamoorthy; [2014]
    Keywords : MIMO; MPS system; Antenna array;

    Abstract : This thesis work presents a study on the impact of mutual coupling among antenna arrays on the performance of the multipath simulator (MPS) system. In MIMO systems, it is a wellknown fact that the mutual coupling significantly affects their system performance. READ MORE