Sökning: "RARE-EARTH ELEMENTS"

Visar resultat 36 - 40 av 67 avhandlingar innehållade orden RARE-EARTH ELEMENTS.

1. 36. Magma generation and formation of continental crust in the Izu arc

   Författare :Haochen Duan; Abigail Barker; Jaroslaw Majka; Stefan Wastegård; Kate Saunders; Susanne M. Straub; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Oceanic arc; Izu rear-arc; Melt inlcusions; Oxygen isotopes; Boron isotopes; Continental crust; Mantle hererogeneity; In-situ microanalysis; IMS-1280; Geovetenskap med inriktning mot mineralogi; petrologi och tektonik; Earth Science with specialization in Mineral Chemistry; Petrology and Tectonics;

   Sammanfattning : The Izu oceanic arc is produced by the subduction of the Pacific Sea Plate beneath the Philippine Sea Plate. The proto-Izu oceanic arc was initially formed at ca. 50 Ma, then it was separated into the Kyushu-Palau and Izu arc by the extension of the Shikoku basin from ca. 25 Ma. LÄS MER

3. 37. Modulations in Intermetallic Families of Compounds

   Författare :Hanna Lind; Sven Lidin; Gervais Chapuis; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; intermetallic; incommensurate structure; single crystal X-ray diffraction; Inorganic chemistry; Oorganisk kemi;

   Sammanfattning : This thesis is based on a study of five distinct intermetallic systems with the aim of expanding the general knowledge of aperiodically modulated crystal structures. Families of compounds that contain a variety of superstructures together with incommensurately modulated structures have been investigated mainly by means of single crystal X-ray diffraction and higher dimensional structure models. LÄS MER

4. 38. Material Constraints on Technology Evolution: The Case of Scarce Metals and Emerging Energy Technologies

   Författare :Björn A. Andersson; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; energy; metal scarcity; solar cell; sustainable development; technology policy; lock-in; industrial ecology; technical change; battery; electric vehicle;

   Sammanfattning : A radical transformation of the energy system in the 21st century will require a large-scale diffusion of a range of new energy technologies. Thin-film solar photovoltaics (PV) and battery-electric vehicles have been suggested as possible major components of a more sustainable energy system. LÄS MER

5. 39. Recycling of nickel metal hydride (NiMH) batteries; Characterization and recovery of nickel, AB5 alloy and cobalt

   Författare :Filip Holmberg; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; recycling; nickel; AB5 alloy; cobalt; NiMH battery; hydrogen storage alloy; leaching;

   Sammanfattning : Nickel metal hydride (NiMH) batteries are used today for applications that can assist in the adaptation toward carbon-neutral energy sources (i.e. hybrid vehicles and smart grids). Recovery of metals such as nickel, cobalt and rare earth elements (REEs) from discarded NiMH batteries is important for economic and/or technological reasons. LÄS MER

7. 40. Nanostructured Tungsten Materials by Chemical Methods

   Författare :Sverker Wahlberg; Mamoun Muhammed; Håkan Engqvist; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : Tungsten based-materials are used in many different technical fields, particularly in applications requiring good temperature and/or erosion resistance. Nanostructuring of tungsten alloys and composites has the potential to dramatically improve the materials’ properties, enhancing the performance in present applications or enabling totally new possibilities. LÄS MER