Essays about: "Cheng Cheng"

Showing result 1 - 5 of 88 essays containing the words Cheng Cheng.

  1. 1. Evaporation Duct Modelling for a Wave-Propagation Simulator

    University essay from Karlstads universitet/Institutionen för ingenjörsvetenskap och fysik (from 2013)

    Author : Oscar Eklund; [2022]
    Keywords : evaporation; duct; height; monin; obukhov; mos; surface; layer; ssft; byc; pj; businger; dyer; beljaars; holtslag; cheng; brutsaert; sheba;

    Abstract : Long-range communication proves to be a challenge due to the Earth’s curvature, since electromagnetic waves propagate away from the Earth’s surface in a free atmosphere. A possible solution to beyond line-of-sight communication is the atmospheric phenomenon known as the evaporation duct. READ MORE

  3. 2. Efficient High-level Synthesis Implementation of massive MIMO Processing on RFSoC

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

    Author : Sijia Cheng; [2022]
    Keywords : Technology and Engineering;

    Abstract : Massive multiple-input multiple-output (MIMO) refers to a wireless access technology that equips base station (BS) with hundreds to thousands of antennas to serve tens of user equipment (UE) in the same time-frequency resource. These extensive antennas improve spectral and energy efficiency, but the detection algorithms tend to be more complex with operations, multiplications, and inversions on larger size matrix. READ MORE

  4. 3. Data-driven Dynamic Baseline Calibration Method for Gas Sensors

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

    Author : Cheng Yang; [2021]
    Keywords : CO2 gas sensing; drift; dynamic baseline calibration; time series analysis; data-driven modeling; clustering; classification; CO2 gasavkänning; drift; dynamisk baslinjekalibrering; tidsserieanalys; datadriven modellering; kluster; klassificering;

    Abstract : Automatic Baseline Correction is the state-of-the-art calibration method of non-dispersive infrared CO2 sensing, which is the standard CO2 gas monitoring method. In this thesis, we improve it by introducing the dynamic baseline based on environmental data. READ MORE

  5. 4. Adaptation of buildings for climate change : A literature review

    University essay from Högskolan i Gävle/Avdelningen för byggnadsteknik, energisystem och miljövetenskap

    Author : Cheng Cheng; [2021]
    Keywords : Climate change; Extreme weather; Building energy efficiency; Passive houses;

    Abstract : In September 2020, Northeast China suffered three unprecedented typhoons in half a month, and there was freezing rain in early November, all of which led to the large-scale urban power failure. The occurrence of these phenomena makes people directly see climate change and its impact on the living environment of human beings. READ MORE

  6. 5. The Impact of COVID-19 Restrictions on Air Quality- Based on Seven Cities in China

    University essay from Lunds universitet/Nationalekonomiska institutionen

    Author : Cheng Chen; [2021]
    Keywords : COVID-19; air quality; fixed effect model; regression discontinuity; Business and Economics;

    Abstract : Many researchers have studied the impact of the COVID-19 restrictions. However, in terms of the air quality impact, few studies have done so for specific cities. In this study, seven cities in China under the first stage of transmission prevention have been selected. The air quality standard indicators discussed are NO2 (Nitrogen dioxide), PM2. READ MORE