Materials Science (MATER SCI-MEDZG)

Journal description

Current impact factor: 0.34

Impact Factor Rankings

2015 Impact Factor Available summer 2015
2013 / 2014 Impact Factor 0.336
2012 Impact Factor 0.522
2011 Impact Factor 0.492
2010 Impact Factor 0.409
2009 Impact Factor 0.299

Impact factor over time

Impact factor

Additional details

5-year impact 0.47
Cited half-life 3.40
Immediacy index 0.00
Eigenfactor 0.00
Article influence 0.12
ISSN 1392-1320

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: Cellular phones are used in the vicinity of a human head, which absorbs power from antenna radiation. This investigation analyzes the effects of antenna substrate materials on electromagnetic (EM) absorption in a human head. Antennas are used in analysis with four different dielectric substrate materials, which are Bakelite, FR4 glass epoxy, Rogers R04003, and Taconic TLC. Moreover, two different thicknesses of each substrate are considered in the experimental setup. The EM absorption associated with two types of cell phone antennas is evaluated in the closed vicinity of the human head model. One of them is planar inverted-F antenna (PIFA), which is used as the internal handset antenna and another one is helical antenna, which is used as external handset antenna. This investigation consists of two different operating frequency bands, GSM 900MHz and DCS 1800 MHz. The EM absorption in the human head is presented using the peak specific absorption rate (SAR) and total absorbed power (TAP) by the user. The finite-difference time-domain (FDTD) method based on Computer Simulation Technology (CST) Microwave studio is utilized in this investigation. The obtained results show that the substrate materials do not effect SAR and TAP values considerably for both antennas, but substrate thickness affects the SAR and TAP values significantly. In addition, the substrate thickness affects the SAR and TAP values significantly in most of the cases Moreover, PIFA produces lower SAR than that of a helical antenna significantly for both GSM and DCS frequency band.
    Materials Science 08/2015; Article in Press.
  • [Show abstract] [Hide abstract]
    ABSTRACT: e present the solution of the problem of process zone which develops under the condition of plain deformation from the tip of an interface crack that coincides with the corner point of the interface of two different materials. The process zone is modeled by the line of discontinuity of tangential displacements on the interface and by the lateral line of discontinuity of the normal displacements. The equation for finding the lengths of both discontinuity lines and the expression for the crack opening displacement are obtained. We study the influence of plasticity of the material of the joint on the direction and conditions of crack start.
    Materials Science 11/2014; 50(1):46-54.
  • Materials Science 08/2014;
  • [Show abstract] [Hide abstract]
    ABSTRACT: One of the most severe pathologies suffered by early industrially produced tiles in Portugal in late nineteenth century is glaze detachment in wall tiles placed in the lower part of the façade. It is known that salts crystallize provoking the glaze detachment, destroying the waterproofing and the beauty of the wall tile and this is one of the crucial factors towards this occurrence. The present work questions the importance of the thickness of glaze/ceramic body interface, in what concerns glaze detachment provoked by salt crystallization. SEM-EDS was used to perform all the observations that lead to the conclusion that the exuberance of the interface between glaze and ceramic body has no influence in the resistance of the glaze to salt crystallization though time, being the porous network more determinant. Keywords: ancient wall tiles, glaze/ceramic body interface, salt crystallization, glaze detachment.
    Materials Science 04/2014; 20(1):108-113. DOI:10.5755/
  • [Show abstract] [Hide abstract]
    ABSTRACT: Three dimensionally ordered macroporous bioactive glasses (3DOM-BGs), namely 80SiO2-15CaO-5P2O5, were synthesized by sol-gel method. PMMA colloidal crystals and non-ionic block copolymers P123 were used as cotemplates. The amorphous 3DOM-BGs had skeletal walls enclosing macropores. Such structure resulted from octahedral and tetrahedral holes of the face-centered cubic (fcc) closest packed PMMA templates and windows interconnecting through macropores network. The thicknesses of the walls were around 50 nm – 80 nm and the windows were 90 nm – 110 nm in diameter. These wall thickness is increased by with an increase in ageing time up to 24 h and then gradually reduced with further increase in aging time. Vibration bands of Si–O–Si and P–O were evident in infrared spectra which are in agreement with EDS spectra indicating Si, P and Ca compositions. After in vitro bioactivity testing by soaking 3DOM-BGs in simulated body fluid at 37 °C, the crystallization of amorphous calcium phosphate layers compatible to the bone component of hydroxyl carbonate apatite were rapidly formed within 3 h. These results indicated that these 3DOM-BGs resembled ideal bone implant materials.
    Materials Science 04/2014; 20(1):97. DOI:10.5755/
  • [Show abstract] [Hide abstract]
    ABSTRACT: The reduced dimensionality of present electronic devices brings along changes in the dopant distribution in the device channel, in which only a small number of dopants exist. Recent studies demonstrated that individual dopants strongly affect the electrical characteristics of nanoscale transistors. On the other hand, nanoscale pn junctions, building unit of more complex devices, have not been sufficiently studied from this viewpoint. In this work, we report several experiments that we carried out on nano-pn junctions in which the individuality of dopants is prominently observed. In electrical characteristics, we report, under various conditions, random telegraph signals (RTS) related to dopants as traps. The dynamic behavior of the depletion region of nano-pn junctions is also characterized by Kelvin probe force microscopy.
    Materials Science 01/2014; 20(2):129. DOI:10.5755/