Results 11 to 20 of about 252,127 (151)

Els vostres préstecs s'han renovat fins al 18 de maig. (Abril 2020)

open access: yes, 2020
Imatge utilitzada per fer publicitat de novetats del CRAI de la Universitat de Barcelona - Vitrina Abril 2020.El CRAI de la UB, d'acord amb la resta d'institucions del CSUC, modifica el període de préstec de documents i l'allarga fins al 18 de maig.
Universitat de Barcelona. CRAI
core   +6 more sources

PAS a PAS fins Nadal

open access: yes, 2023
De l'1 al 24 de desembre descobreix el ‘PAS a PAS fins Nadal’, un calendari d’Advent en format audiovisual per visibilitzar com el personal tècnic, de gestió i d’administració i serveis (PTGAS) contribueix a fer comunitat amb la seva feina diària i a ...

core   +1 more source

Design and performance analysis of a new evacuated tube solar air heaters equipped with fins and coils

open access: yesInternational Journal of Sustainable Energy, 2020
Evacuated tube solar air heaters (ETSH) are efficient, easy to maintain, and have low energy losses due to the vacuum between the absorber and the outer tubes.
Tareq Abu Hamed, Salem Alkharabsheh
doaj   +1 more source

Numerical Study on Heat Transfer and Enhancement Mechanism in PCM-Filled Shell-and-Tube Heat Exchangers

open access: yesFrontiers in Energy Research, 2022
A numerical model was established using the enthalpy-porosity approach to study the heat transfer characteristics of a shell-and-tube phase change heat exchanger filled with paraffin wax RT50.
Jiabin Fang   +4 more
doaj   +1 more source

S'atura el Servei PUC - préstec consorciat - aturat fins a nou avís. (Setembre 2021)

open access: yes, 2021
Imatge utilitzada per fer publicitat de novetats del CRAI de la Universitat de Barcelona - Vitrina setembre 2021.Com ja us vam informar fa unes setmanes, el CRAI de la UB, juntament amb la resta de les biblioteques del CSUC, està canviant el sistema ...
Universitat de Barcelona. CRAI
core   +6 more sources

A Numerical Investigation of a Melting Rate Enhancement inside a Thermal Energy Storage System of Finned Heat Pipe with Nano-Enhanced Phase Change Material

open access: yesNanomaterials, 2022
Thermal energy storage via the use of latent heat and phase transition materials is a popular technology in energy storage systems. It is vital to research different thermal enhancement techniques to further improve phase transition materials’ weak ...
Anuwat Jirawattanapanit   +8 more
doaj   +1 more source

Development of cytochrome-c-oxidase 1 specific primers for genetic discrimination of the European eel Anguilla anguilla (Linnaeus, 1758). [PDF]

open access: yesJournal of Bioscience and Applied Research, 2016
The European eel Anguilla anguilla (Anguillidae, Anguilliformes) is amongst the most peculiar, economically-important fish species in the Egyptian and Mediterranean waters. Very rare studies are available about its populations in the Mediterranean.
Khaled Mohammed- Geba   +2 more
doaj   +1 more source

A Variational Formulation for Fins with Nonzero Contact Thermal Resistance at the Base

open access: yesAxioms, 2023
This paper considers the steady-state heat transfer process in a fin with a Robin boundary condition at the base (instead of the usual Dirichlet boundary condition at the base). Robin boundary condition models the effect of the thermal resistance between
Rogério Martins Saldanha da Gama   +3 more
doaj   +1 more source

Enhancing the Melting Process of Shell-and-Tube PCM Thermal Energy Storage Unit Using Modified Tube Design

open access: yesNanomaterials, 2022
Recently, phase change materials (PCMs) have gained great attention from engineers and researchers due to their exceptional properties for thermal energy storing, which would effectively aid in reducing carbon footprint and support the global transition ...
Aissa Abderrahmane   +7 more
doaj   +1 more source

Efficient and simple determination of olive oil rancidity [PDF]

open access: yesJournal on Processing and Energy in Agriculture, 2012
There are two major factors that cause cooking oils to become rancid. The first one is exposure of oil to light, starting a cascade of radical reactions leading to the breaking down of chains of unsaturated fatty acids.
Vujić Đura   +3 more
doaj  

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