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Ibrahim A. Abbas,Aboelnour Abdalla,Fathi Anwar,Hussien Sapoor Techno-Press 2023 Advances in materials research Vol.12 No.1
In the present article, the effects of three thermal relaxation times in living tissue under the three-phaselag (TPL) bioheat model are introduced. Using the Laplace transforms, the analyticalsolution of the temperature and the resulting thermal damagesin living tissues are obtained. The experimental data are used to validate the analytical solutions. By the formulations of Arrhenius, the thermal damage of tissue is estimated. Numerical outcomes for the temperature and the resulting of thermal damages are presented graphically. The effects of parameters, such as thermalrelaxation times, blood perfusion rate on tissue temperature are also discussed in detail.
Nonlocal heat conduction approach in biological tissue generated by laser irradiation
Abbas, Ibrahim A.,Abdalla, Aboelnour,Sapoor, Hussien Techno-Press 2022 Advances in materials research Vol.11 No.2
A novel nonlocal model with one thermal relaxation time is presented to investigates the thermal damages and the temperature in biological tissues generated by laser irradiations. To obtain these models, we used the theory of the non-local continuum proposed by Eringen. The thermal damages to the tissues are assessed completely by the denatured protein ranges using the formulations of Arrhenius. Numerical results for temperature and the thermal damage are graphically presented. The effects nonlocal parameters and the relaxation time on the distributions of physical fields for biological tissues are shown graphically and discussed.
Ibrahim Abbas,M. Saif AlDien,Mawahib Elamin,Alaa El-Bary Techno-Press 2024 Coupled systems mechanics Vol.13 No.1
This study seeks to develop analytical solutions for the biothermoelastic model without accounting for energy dissipation. These solutions are then applied to estimate the temperature changes induced by external heating sources by integrating relevant empirical data characterizing the biological tissue of interest. The distributions of temperature, displacement, and strain were obtained by utilizing the eigenvalues approach with the Laplace transforms and numerical inverse transforms method. The impacts of the rate of blood perfusion and the metabolic activity parameter on thermoelastic behaviors were discussed specifically. The temperature, displacement, and thermal strain results are visually represented through graphical representations.
Analytical solution of a two-dimensional thermoelastic problem subjected to laser pulse
Ibrahim A. Abbas,Faris S. Alzahrani 국제구조공학회 2016 Steel and Composite Structures, An International J Vol.21 No.4
In this article, the problem of a two-dimensional thermoelastic half-space are studied using mathematical methods under the purview of the generalized thermoelastic theory with one relaxation time is studied. The surface of the half-space is taken to be thermally insulated and traction free. Accordingly, the variations of physical quantities due to by laser pulse given by the heat input. The nonhomogeneous governing equations have been written in the form of a vector-matrix differential equation, which is then solved by the eigenvalue approach. The analytical solutions are obtained for the temperature, the components of displacement and stresses. The resulting quantities are depicted graphically for different values of thermal relaxation time. The result provides a motivation to investigate the effect of the thermal relaxation time on the physical quantities.
Ibrahim A. Abbas 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.10
The thermoelastic interaction in an unbounded medium with a spherical cavity is studied using two-temperature generalized thermoelasticitytheory. The medium is assumed to be initially quiescent. The inner surface of the cavity is taken traction free and subjected to athermal shock. By the Laplace transformation, the basic equations are expressed in the form of a vector-matrix differential equation,which is solved by an eigenvalue approach. Some comparison have been shown in figures to estimate the effect of the two-temperatureparameter.
2D deformation in initially stressed thermoelastic half-space with voids
Ibrahim A. Abbas,Rajneesh Kumar 국제구조공학회 2016 Steel and Composite Structures, An International J Vol.20 No.5
The present investigation is to study the plane problem in initially stressed thermoelastic half-space with voids due to thermal source. Lord-Shulman (Lord and Shulman 1967) theory of thermoelasticity with one relaxation time has been used to investigate the problem. A particular type of thermal source has been taken as an application of the approach. Finite element technique has been used to solve the problem. The components of displacement, stress, temperature change and volume fraction field are computed numerically. The resulting quantities are depicted graphically for different values of initial stress parameter. The relaxation time and the initial stress parameter have a significant effect on all distributions.
Ibrahim, Suzan Seif,Al-Attas, Safia Ali,Darwish, Zeinab Elsayed,Amer, Hala Abbas,Hassan, Mona Hassan Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.15
Background: To evaluate the effectiveness of Microlux/DL with and without toluidine blue in screening of potentially malignant and malignant oral lesions. Materials and Methods: In this diagnostic clinical trial clinical examination was carried out by two teams: 1) two oral medicine consultants, and 2) two general dentists. Participants were randomly and blindly allocated for each examining team. A total of 599 tobacco users were assessed through conventional oral examination (COE); the examination was then repeated using Microlux/DL device and toluidine blue. Biopsy of suspicious lesions was performed. Also clinicians opinions regarding the two tools were obtained. Results: The sensitivity and, specificity and positive predictive value (PVP) of Microlux/DL for visualization of suspicious premalignant lesions considering COE as a gold standard (i.e screening device) were 94.3%, 99.6% and 96.2% respectively, while they were 100%, 32.4% and 17.9% when considering biopsy as a gold standard. Moreover, Microlux/DL enhanced detection of the lesion and uncovered new lesions compared to COE, whereas it did not alter the provisional clinical diagnosis, or alter the biopsy site. On the other hand, adding toluidine blue dye did not improve the effectiveness of the Microlux/DL system. Conclusions: The Microlux/DL seems to be a promising adjunctive screening device.
Transdermal Delivery of Crocin Using Bacterial Nanocellulose Membrane
Mustapha Abba,Zaharah Ibrahim,Chun Shiong Chong,Nurliyana Ahmad Zawawi,Mohammed Rafiq Abdul Kadir,Abdul Halim Mohd Yusof,SAIFUL IZWAN ABD RAZAK 한국섬유공학회 2019 Fibers and polymers Vol.20 No.10
This work reports the inclusion of crocin (an active agent of saffron) into bacterial nanocellulose (BNC) membranefor transdermal drug delivery. The BNC showed good uptake of the crocin based on the swelling studies and vibrationalpeaks of the FTIR spectra. Surface morphology of the crocin loaded BNC showed that the fibrous nano feature was still intactwith no fiber damages. The crocin release via direct dissolution showed typical burst release. Franz diffusion test revealedstable and prolong drug permeation. Partition coefficient of the BNC-crocin via mice epidermal skin diffusion was found tobe 2.44×10-4 cm-2 min-1 with the average mass flux of 0.53 cm-2 min-1. This facile method of utilizing BNC for the carrier ofcrocin can be useful for administrating other water soluble active compound. Thus BNC opens up choices for the delivery ofcrocin for medicinal purposes.