Sökning: "protection coefficients"

Visar resultat 1 - 5 av 12 uppsatser innehållade orden protection coefficients.

1. 1. Risk computation for atmospheric re-entry

   Master-uppsats, KTH/Rymdteknik

   Författare :Florian Teilhard; [2021]
   Nyckelord :Spacecraft Dynamics; Atmospheric re-entry; Rymdfarkosters dynamik; Atmosfäriska återinträdet;

   Sammanfattning : In the present work, two numerical tools are under scrutiny. Both were made to study the atmospheric re-entry of a spacecraft: DEBRISK computes the trajectory and the survivability of the spacecraft as well as its fragments, and ELECTRA calculates the trajectory of the spacecraft and its fragments, as well as the associated on-ground risk of human casualty. LÄS MER

3. 2. SUSTAINABLE LUBRICATION FOR FUTURE TRANSMISSIONS : Micropitting performance of Glycerol-based lubricants

   Master-uppsats, Luleå tekniska universitet/Institutionen för teknikvetenskap och matematik

   Författare :Zapata Tamayo Juan Guillermo; [2021]
   Nyckelord :micropitting; mild sliding wear; surface coating; diamond-like carbon DLC; glycerol-based lubrication; green lubricant; rolling contact fatigue; rolling-sliding;

   Sammanfattning : Achieving sustainable lubrication by using environmentally friendly formulated lubricants has became an essential component of the transition process from fossil-powered vehicles to electrified transportation. Mixtures, or aqueous solutions of molecules such as polyhydroxy alcohols, and glycols usually known as green lubricants make it possible to achieve low friction coefficients under different lubrication conditions, which constitutes a potential alternative to improve the tribological performance of moving parts in automotive systems, at the same time that the environmental requirements are satisfied. LÄS MER

4. 3. Socialsekreterares bedömningar av sexuella syskonövergrepp

   Master-uppsats, Lunds universitet/Socialhögskolan

   Författare :Marcus Westergren; [2021]
   Nyckelord :Sibling sexual abuse; social workers’ professional judgements; child protection; gender differences in judgments; Sexuella syskonövergrepp; socialsekreterares professionella bedömningar; social barnavård; könsskillnader i bedömningarna; Social Sciences;

   Sammanfattning : Social workers’ judgements of sexual abuse among siblings The aim of this study was to investigate which factors relating to 1) the child and family and to 2) the respondent have an impact on social workers’ professional judgments about sexual sibling incest. The study was carried out in the form of an experimental vignette survey (a factorial survey), in which the respondents made judgements about fictitious cases describing various situations of potential sexual sibling incest. LÄS MER

5. 4. B-plane orbital resonance analysis and applications

   Master-uppsats, KTH/Rymdteknik

   Författare :Alessandro Masat; [2020]
   Nyckelord :;

   Sammanfattning : Many space engineering and orbital mechanics applications seek for the usage of focused mathematical models, capable of providing useful insight onto particular phenomena or exploiting some theoretical and physical tools to reduce the computational costs and/or increase the level of accuracy reached. Orbital resonances are one of the phenomena that needs to be properly modelled, both for exploiting such features in the mission design phase and to predict possible resonant returns of threatening objects closely approaching a specified planet. LÄS MER

7. 5. Förhindrande av frostbildning i plattvärmeväxlare via variabel förvärmd uteluft

   Kandidat-uppsats, Högskolan i Gävle/Energisystem och byggnadsteknik

   Författare :Mathias Svedman; [2019]
   Nyckelord :Freeze protection in heat exchangers; energy recovery; plate heat exchanger; analytical model; turbulent flow in heat exchangers; ventilation; preheating; Påfrostning i värmeväxlare; värmeåtervinning; plattvärmeväxlare; turbulent flöde i värmeväxlare; ventilation; analytisk modell; FTX-ventilation; förvärmning.;

   Sammanfattning : Denna studie har undersökt om förvärmning av luft är en bra metod för att undvika frostbildning i motströmsplattvärmeväxlare i luftbehandlingsaggregat. Frostbildning i värmeväxlare för ventilation är ett problem i kalla klimat och sänker den återvunna energimängden när potentialen för energiåtervinning är som högst. LÄS MER