Derivation of extracellular fluid volume fraction and equivalent dielectric constant of the cell membrane from dielectric properties of the human body. Part 2: A preliminary study for tracking the progression of surgical tissue injury

2000 ◽  
Vol 38 (4) ◽  
pp. 384-389 ◽  
Author(s):  
T. Tatara ◽  
K. Tsuzaki
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Cell Membrane ◽  
Human Body ◽  
Volume Fraction ◽  
Tissue Injury ◽  
Extracellular Fluid ◽  
Body Part ◽  
Human Body Part ◽  
Preliminary Study

scholarly journals Effect of Terminal Groups on Thermomechanical and Dielectric Properties of Silica–Epoxy Composite Modified by Hyperbranched Polyester

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2451
Author(s):  
Jianwen Zhang ◽  
Dongwei Wang ◽  
Lujia Wang ◽  
Wanwan Zuo ◽  
Lijun Zhou ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Binding Energy ◽  
Epoxy Resin ◽  
Volume Fraction ◽  
Epoxy Composite ◽  
Mean Square Displacement ◽  
Mean Square ◽  
Hyperbranched Polyester ◽  
Free Volume Fraction

To study the effect of hyperbranched polyester with different kinds of terminal groups on the thermomechanical and dielectric properties of silica–epoxy resin composite, a molecular dynamics simulation method was utilized. Pure epoxy resin and four groups of silica–epoxy resin composites were established, where the silica surface was hydrogenated, grafted with silane coupling agents, and grafted with hyperbranched polyester with terminal carboxyl and terminal hydroxyl, respectively. Then the thermal conductivity, glass transition temperature, elastic modulus, dielectric constant, free volume fraction, mean square displacement, hydrogen bonds, and binding energy of the five models were calculated. The results showed that the hyperbranched polyester significantly improved the thermomechanical and dielectric properties of the silica–epoxy composites compared with other surface treatments, and the terminal groups had an obvious effect on the enhancement effect. Among them, epoxy composite modified by the hyperbranched polyester with terminal carboxy exhibited the best thermomechanical properties and lowest dielectric constant. Our analysis of the microstructure found that the two systems grafted with hyperbranched polyester had a smaller free volume fraction (FFV) and mean square displacement (MSD), and the larger number of hydrogen bonds and greater binding energy, indicating that weaker strength of molecular segments motion and stronger interfacial bonding between silica and epoxy resin matrix were the reasons for the enhancement of the thermomechanical and dielectric properties.

Bio-material human body part (palm fingers) based electronic FET transistor

2012 ◽  
Vol 10 (4) ◽  
pp. 368
Author(s):  
Shiv Prasad Kosta ◽  
Y.P. Kosta ◽  
Jitendra Prasad Chaudhary ◽  
Piyush R. Vaghela ◽  
Harsh Mehta ◽  
...  
Keyword(s):  
Human Body ◽  
Body Part ◽  
Human Body Part ◽  
Bio Material

DIELECTRIC PROPERTIES OF POLY (VINYLIDENE FLUORIDE)/BARIUM TITANATE NANOCOMPOSITES UNDER GAMMA IRRADIATION

2019 ◽  
Vol 184 (3-4) ◽  
pp. 342-346
Author(s):  
K Waree ◽  
K Pangza ◽  
N Jangsawang ◽  
P Thongbai ◽  
S Buranurak
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Gamma Irradiation ◽  
Nanocomposite Film ◽  
Gamma Ray ◽  
Vinylidene Fluoride ◽  
Volume Fraction ◽  
Composite Films ◽  
Significant Difference ◽  
Accumulated Dose

Abstract The main focus of this study is to investigate the effect of gamma irradiation on the electrical properties of PVDF/BT nanocomposites. A 1.25 MeV gamma-ray was delivered to the composite films with different BaTiO3-volume fraction, ƒBT = 0–0.4, and with different absorbed doses ranged 50–2500 Gy. Dielectric properties of PVDF/BaTiO3 composites under frequencies ranged from 100 Hz to 10 MHz at room temperature were investigated using an impedance analyser. An increase of 28% in the dielectric constant and a decrease of 15% in the loss tangent were observed in the PVDF/BT 40 vol% nanocomposite film under the accumulated dose of 1500 Gy. Scanning electron microscopy provided no significant difference in microscopic structures between non-exposed and gamma-exposed materials. Fourier-transform infra-red spectroscopy provides gamma-induced transition of PVDF-crystalline forms as alpha-PVDF into beta-PVDF/gamma-PVDF which has been reported as one of the main factors affected the change of dielectric constant in polymers. UV–visible spectrophotometry has been observed gamma-induced red shift in the absorption edge of the PVDF/BT 40 vol% nanocomposite film from 400 nm to 420 nm under the accumulated dose of 1500 Gy. However, a blue shift is observed with increase the accumulated dose up to 2000 Gy.

The effects of obesity on the human body, part I: Skin and musculoskeletal

2020 ◽  
Author(s):  
Graham Dupont ◽  
Stephen J. Bordes ◽  
Stefan Lachkar ◽  
Lauren Wahl ◽  
Joe Iwanaga ◽  
...  
Keyword(s):  
Human Body ◽  
Body Part ◽  
Human Body Part

Preparation, Morphology and Dielectric Properties of Polyamide-6/Poly(Vinylidene Fluoride) Blends

2012 ◽  
Vol 496 ◽  
pp. 263-267
Author(s):  
Rui Li ◽  
Jian Zhong Pei ◽  
Yan Wei Li ◽  
Xin Shi ◽  
Qun Le Du
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Flexible Electronics ◽  
High Dielectric Constant ◽  
Vinylidene Fluoride ◽  
Volume Fraction ◽  
Polyamide 6 ◽  
Dielectric Constants ◽  
Poly Vinylidene Fluoride ◽  
High Dielectric

A novel all-polymeric material with high dielectric constant (k) has been developed by blending poly (vinylidene fluoride) (PVDF) with polyamide-6 (PA6). The dependence of the dielectric properties on frequency and polymer volume fraction was investigated. When the volume fraction of PA6 is 20%, the dielectric property is better than others. The SEM investigations suggest that the enhanced dielectric behavior originates from significant interfacial interactions of polymer-polymer. The XRD demonstrate that the PA6 and PVDF affect the crystalline behavior of each component. Furthermore, the stable dielectric constants of the blends could be tuned by adjusting the content of the polymers. The created high-k all-polymeric blends represent a novel type of material that are simple technology and easy to process, and is of relatively high dielectric constant, applications as flexible electronics.

When romantic love in Gĩkũyũ becomes a human body part

2015 ◽  
Vol 2 (1) ◽  
pp. 79-93 ◽  
Author(s):  
Moses Gatambuki Gathigia ◽  
Ruth W. Ndung’u ◽  
Daniel Ochieng Orwenjo
Keyword(s):  
Human Body ◽  
Cognitive Linguistics ◽  
Body Part ◽  
Body Parts ◽  
Conceptual Metaphor Theory ◽  
Identification Procedure ◽  
Interview Schedule ◽  
Human Body Part ◽  
Metaphor Theory ◽  
Research Assistants

Studies in Cognitive Linguistics show that metaphors are fundamental to the structuring of people’s thought and language (Sweetser 1990; Kövecses 2009). It is against this backdrop that this study discusses human body parts as metaphors of conceptualizing love in Gĩkũyũ. To achieve this objective, an interview schedule was administered to 48 respondents of different gender by the researcher assisted by four research assistants. The Conceptual Metaphor Theory (CMT) and the main principles of the Metaphor Identification Procedure Vrije Universiteit (MIPVU) (see Steen et al. 2010) were used in this study. The principles of the MIPVU were employed to find out whether the lexical items collected were metaphorical or not. Using three annotators and the researcher, the study identified 100 Metaphor Related Words (MRWs) as per the annotation guidelines adapted from the MIPVU procedures and three lexical units which were annotated as Discard From Metaphor Analysis (DFMA). From the MRWs, the study identified eight metaphors of human body parts which play an indispensable role in the conceptualization of love in Gĩkũyũ. Further, the study noted that gender is a vital variable that provides people with the prism through which they view love since males registered more lexical frequencies for LOVE IS A HUMAN BODY PART than females. The study concludes that metaphor in Cognitive Linguistics is not only a creative device, but an important mental facility and cognitive instrument.

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