نتایج جستجو برای: phase change materials pcm
تعداد نتایج: 1542353 فیلتر نتایج به سال:
Phase Change Materials (PCMs) have high thermal inertia, and hemp concrete (HC), a bio-based concrete, has strong hygroscopic behavior. In previous studies, PCM been extensively combined with many materials, however, most of these studies focused on properties while neglecting aspects. this study, the two materials into building envelope related hygrothermal studied. particular, numerical perfo...
PURPOSE To compare mean global cerebral blood flow (CBF) measured by phase-contrast mapping magnetic resonance imaging (PCM MRI) and by 15 O-H2 O positron emission tomography (PET) in healthy subjects. PCM MRI is increasingly being used to measure mean global CBF, but has not been validated in vivo against an accepted reference technique. MATERIALS AND METHODS Same-day measurements of CBF by ...
During the fast switching in Ge2Sb2Te5 phase change memory devices, both the amorphous and fcc crystalline phases remain metastable beyond the fcc and hexagonal transition temperatures respectively. In this work, the metastable electrical properties together with crystallization times and resistance drift behaviour of GST are studied using a high-speed, device-level characterization technique i...
We present a practical method to determine femtosecond laser induced refractive index changes in transparent materials. Based on an iterative Fourier transform algorithm, this technique spatially resolves the refractive index of complex structures by combining the dimensions of the modified region with the corresponding phase change extracted from far-field intensity measurements. This approach...
This study is focused on the preparation and performance of a building energy storage panel (BESP). The BESP was fabricated through a mold pressing method based on phase change material particle (PCMP), which was prepared in two steps: vacuum absorption and surface film coating. Firstly, phase change material (PCM) was incorporated into expanded perlite (EP) through a vacuum absorption method t...
Phase-change materials are functionally important materials that can be thermally interconverted between metallic (crystalline) and semiconducting (amorphous) phases on a very short time scale. Although the interconversion appears to involve a change in local atomic coordination numbers, the electronic basis for this process is still unclear. Here, we demonstrate that in a nearly vacancy-free b...
Freezers and dry ice are used for cold chains. Besides them, phase change materials (PCMs) also involved. A PCM is a substance absorbing releasing energy at transition. The therefore useful heating cooling applications. Here we review some facts about the use of freezer, dry-ice PCMs equipment in Ultra Low Temperature Logistics.
To address the increasing energy demand, replacing conventional systems with non-conventional resources like solar power generation is crucial. Photovoltaic (PV) panels play a significant role in harnessing and converting it into electrical power. However, cells’ temperature dramatically influences panel’s performance, particularly hot climates. In this study, detailed mathematical model develo...
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