Sökning: "Phase change memory"

Visar resultat 1 - 5 av 20 avhandlingar innehållade orden Phase change memory.

  1. 1. First-Principles Studies of Materials Properties : Pressure-Induced Phase Transitions & Functional Materials

    Författare :Thanayut Kaewmaraya; Rajeev Ahuja; Scheicher Ralph; Naurang Saini; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Density functional theory; Pressure-induced phase transitions; Ab-initio molecular dynamic; hybrid functional; Ab-initio random structure searching; Phase change material; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

    Sammanfattning : This thesis presents the first-principles studies of materials properties within the framework of the density functional theory (DFT). The thesis constitutes three main parts, i. e., pressure-induced phase transitions in solids, data-storage and clean-energy materials. LÄS MER

  2. 2. Structural, Electronic and Mechanical Properties of Advanced Functional Materials

    Författare :Muhammad Ramzan; Rajeev Ahuja; S. K. Saxena; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; DFT; Hydrogen storage; Rechargeable batteries; Amorphization; Electronic structure; Crystal strcuture; Molecular dynamics; Diffusion; Intercalation voltage; High pressure; MAX phases; Mechanical properties; Optical properties; Phase change memory; Spintronics; Magnetism; Correlation effects; Band structure; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

    Sammanfattning : The search for alternate and renewable energy resources as well as the efficient use of energy and development of such systems that can help to save the energy consumption is needed because of exponential growth in world population, limited conventional fossil fuel resources, and to meet the increasing demand of clean and environment friendly substitutes. Hydrogen being the simplest, most abundant and clean energy carrier has the potential to fulfill some of these requirements provided the development of efficient, safe and durable systems for its production, storage and usage. LÄS MER

  3. 3. A Taxonomy and Design Methodology for Hybrid Memory Systems

    Författare :Dmitry Knyaginin; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Taxonomy; Non-Volatile Memory; Performance; System-Level Models; Methodology; Design Space Exploration; Energy Efficiency; DRAM;

    Sammanfattning : The number of concurrently executing processes and their memory demandin multicore systems continue to grow. Larger and still fast mainmemory is needed for meeting the demand and avoiding an increase inbacking store accesses that are much slower and less energy efficientthan main memory accesses. LÄS MER

  4. 4. Predictors of cognitive decline in memory clinic patients

    Författare :Christin Andersson; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Background: The major challenge in memory clinics is to predict development as well as non-development of dementia among the heterogeneous group of patients with cognitive complaints. Since the advent of pharmacological treatment possibilities for patients with Alzheimer s disease (AD), much research has been focused on predictors for dementia since initiation of treatment in the preclinical phase may prevent development of dementia. LÄS MER

  5. 5. Functional brain imaging of cognitive status in Parkinson's disease

    Författare :Urban Ekman; Johan Eriksson; Lars Nyberg; Lars Forsgren; Oury Monchi; Umeå universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Parkinson’s disease; functional MRI; Mild cognitive impairment; Working memory; Parkinson’s disease dementia; BOLD;

    Sammanfattning : Parkinson’s disease (PD) is next to Alzheimer’s disease (AD) the second most common neurodegenerative disease. PD has traditionally been characterised as a motor disorder, but more recent research has revealed that cognitive impairments are frequent. LÄS MER