Garuda - Garba Rujukan Digital

Muhamad Hamdi

Unknown Affiliation

Author-ID : 323090

Earth & Planetary Sciences Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

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Articles

1

Investigation on the MHz-THz Radiation Field Regime Absorption in Cancer-Health Cell Tissue Muhamad Hamdi; Usman Malik
Komunikasi Fisika Indonesia Vol 10, No 7 (2013)
Publisher : Universitas Riau

This paper focuses on the thermoregulation rise due to exposure of the MHz-THz radiation field regime in cancer-health cell tissue. In fact it may occur some processes such as absorption, transmission, reflection and scattering when this radiation interacts with tissue. It depends on the exposure power source. During in cell tissue there is basically the existence of this radiation field contribution to the cell tissue bioelectric and bio magnetic field result in heat production rate. It has a source from excitations of cell macromolecule photonic-phonon vibrations. The self cell tissue has the periodic bio potential with a small cellular volume results in the bioelectric field. This main reason we investigate and solve the simultaneous equations using Maxwell, heat conduction and sinusoidally modulated intensity equation with spectral method. We assume a small tissue piece to form the spherical or cylindrical cell membrane layer. Absorption involves the extraction of vibration energy from MHz-THz radiation regime field by a cell macromolecular species; the vibration must cause a change in the cell electric dipole moment. Energy absorption is the primary mechanism that allows radiation field of MHz-THz source to produce physical effects on tissue for treatment purposes. While transitions between two energy levels of a molecule that are well defined at specific THz wavelengths could serve as a spectral fingerprint of the cancer molecule for diagnostic purposes.

MODEL OF TERAHERTZ PULSE-BLOOD FLOW INTERACTION FOR OVERCOMING CHOLESTEROL PLAQUE VENTURI EFFECT IN ARTERY Usman Malik; Muhamad Hamdi
Komunikasi Fisika Indonesia Vol 11, No 9 (2014)
Publisher : Universitas Riau

This model attempts to analyze involvement using THz radiation interaction with cholesterol depositsform plaque on the inner walls of an artery. It interacts with blood fluid by principle of THz radiation heattransfer mechanism for overcoming cholesterol plaque venture effect in artery. Athermanous plaque, abuildup of white blood cell wherein is sometimes termed fatty, despite absence of adiposities depositswithin the wall of an artery. When cholesterol deposits form plaque on the inner walls of an artery, thevelocity of blood flow increases when t increases and generates higher pressure according to the ventureeffect. Consequences of this effect can lead to collapse the artery, causing a myocardial infarction in acoronary artery. Analysis on the cholesterol plaque effect in blood flow through the forced convection ofterahertz pulse heat release in artery causes the blood flow change after interacting with terahertz pulse.The results indicate that blood velocity and diffusivity for axial positions to higher with change oftemperature rises along radial position caused by heat release of the absorbed terahertz pulse power inblood flow. Transient behavior of a 10 THz pulse-blood flow interaction in artery wherein the resultchosen varies the blood kinematics viscosity to see how fast this final blood velocity profile is attained.Indeed, for very small blood kinematics viscosities, the response is slower. This result is to be expectedsince the blood kinematics viscosity unit is cm2/s just like the diffusion coefficient and the thermaldiffusivity.

INVESTIGATION ON BIO-ELECTROMAGNETIC FIELD OF TERAHERTZ RADIATION BEHAVIORS AT THE INTERFACE OF BRAIN-FAT TISSUE Muhamad Hamdi
Asian Journal of Innovation and Entrepreneurship Vol 1 No 02 (2012): May 2012
Publisher : UII

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/ajie.vol1.iss2.art2

Analysis at a boundary of brain-fat tissue has been concerned with use of terahertz radiation for fundamental studies in cellular organization and as tools in medical practice. The penetration in these two tissue is analyzed by means of numerical analysis. The 0.1-10 THz gap radiation frequency range is used for realistic theoretical analysis while it is compared to the 0.1-10 MHz and 0.1-10 GHz radiation frequency , respectively. The result of dielectric constant for brain and fat show remain constant for all frequencies in ultrasound and microwave ranges which describe dependence of dielectric constant on frequency. The sharp decrease of K in this specific THz range due to its phenomena absorbs water strongly in near infrared rotational-vibrational spectra and brain tissue included a kind of dielectric medium loss. In addition to in fact the brain tissues consist of most of glucose contained discrete tissue structures relate to water content. The result of the numerical calculation in the THz-MHz signal radiation penetration in interface of brain-fat tissue indicates reduction of electric field intensity amplitude ratio values is caused by properties of dielectric loss tissue from fat ( K = 100 ) to brain (K = 200) and also this radiation absorbs water strongly in the liquid contained tissues. The ratio of magnetic and electric field intensity amplitude is a rise linearly with increasing ranges of higher frequencies. This fact caused besides the higher frequency the higher magnetic field intensity, also THz radiation transmission includes light emissions traveling in a straight line. Keywords: brain-fat tissue, dielectric loss medium, interface, penetration, THz radiation

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