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Article ; Online: Dynamic spring constants of higher resonance modes of uniform and tapered microcantilevers with tip masses.

Mahmoud, M A

Micron (Oxford, England : 1993)

2019 Volume 129, Page(s) 102795

Abstract: A comprehensive data set is presented that covers eigenvalues and dynamic stiffness of width-tapered microcantilevers for a wide range of the taper ratio and tip mass ratios. Closed form expressions are presented, which could help designers and ... ...

Abstract	A comprehensive data set is presented that covers eigenvalues and dynamic stiffness of width-tapered microcantilevers for a wide range of the taper ratio and tip mass ratios. Closed form expressions are presented, which could help designers and researchers in the MEMS field in general, and atomic force microscopy in particular.
Language	English
Publishing date	2019-11-25
Publishing country	England
Document type	Journal Article
ZDB-ID	207808-9
ISSN	1878-4291 ; 0047-7206 ; 0968-4328
ISSN (online)	1878-4291
ISSN	0047-7206 ; 0968-4328
DOI	10.1016/j.micron.2019.102795
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Effect of femtosecond laser interaction with human fibroblasts: a preliminary study.

Zaki Ewiss, M A / Mahmoud, M A / Steiner, R

Lasers in medical science

2023 Volume 38, Issue 1, Page(s) 83

Abstract: In in vitro methods and cell culture models, femtosecond (fs) laser interaction has been employed to assess its effect on the proliferation and morphology of human skin fibroblasts. We cultured a primary human skin fibroblast cell line on a glass plate, ... ...

Abstract	In in vitro methods and cell culture models, femtosecond (fs) laser interaction has been employed to assess its effect on the proliferation and morphology of human skin fibroblasts. We cultured a primary human skin fibroblast cell line on a glass plate, passages 17-23. The cells were irradiated with a 90-fs laser at a wavelength of 800 nm and a repetition rate of 82 MHz. The target received an average power of 320 mW for 5, 20, and 100 s, corresponding to the radiation exposures of 22.6, 90.6, and 452.9 J/cm
MeSH term(s)	Humans ; Cell Communication ; Cell Count ; Cell Culture Techniques ; Fibroblasts ; Lasers
Language	English
Publishing date	2023-03-03
Publishing country	England
Document type	Journal Article
ZDB-ID	632808-8
ISSN	1435-604X ; 0268-8921
ISSN (online)	1435-604X
ISSN	0268-8921
DOI	10.1007/s10103-023-03740-2
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Chemical Treatment of Bio-Derived Industrial Waste Filled Recycled Low-Density Polyethylene: A Comparative Evaluation.

Sider, Ishaq / Nassar, Mahmoud M A

Polymers

2021 Volume 13, Issue 16

Abstract: The search for renewable alternatives for petroleum products that can be used in industrial applications is increasing. Each year, several tons of bio-derived industrial waste is produced and most of it is burned or placed in landfills. Olive pits (OP) ... ...

Abstract	The search for renewable alternatives for petroleum products that can be used in industrial applications is increasing. Each year, several tons of bio-derived industrial waste is produced and most of it is burned or placed in landfills. Olive pits (OP) have unique characteristics such as abundance, renewability, and biodegradability, which can be utilized to develop new types of biocomposites. One of the most promising uses of OP is that they can reinforce the mechanical properties of polymeric biocomposites. This study describes the preparation of recycled low-density polyethylene (rLDPE) that is filled with OP flour (10, 20, 30, and 40 wt.%) using a twin-screw extruder. The effects of the chemical treatment of the OP surface (sodium hydroxide (NaOH) and dimethyl sulfoxide (DMSO)) on the bio-filler/polymer compatibility along with the produced composite's chemical, physical, mechanical, and thermal properties have been explored. Overall, the reinforced composites that were obtained with alkali-treated OP have better biocomposite properties. This indicates an improved compatibility between the bio-filler and matrix. The results are promising in terms of using OP flour in developing green composites.
Language	English
Publishing date	2021-08-11
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2527146-5
ISSN	2073-4360 ; 2073-4360
ISSN (online)	2073-4360
ISSN	2073-4360
DOI	10.3390/polym13162682
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Evaluation of Novel Compatibility Strategies for Improving the Performance of Recycled Low-Density Polyethylene Based Biocomposites.

Nassar, Mahmoud M A / Sider, Ishaq

Polymers

2021 Volume 13, Issue 20

Abstract: The interfacial compatibility of the natural filler and synthetic polymer is the key performance characteristic of biocomposites. The fillers are chemically modified, or coupling agents and compatibilisers are used to ensure optimal filler-polymer ... ...

Abstract	The interfacial compatibility of the natural filler and synthetic polymer is the key performance characteristic of biocomposites. The fillers are chemically modified, or coupling agents and compatibilisers are used to ensure optimal filler-polymer compatibility. Hence, we have investigated the effect of compatibilisation strategies of olive pits (OP) flour content (10, 20, 30, and 40%wt.) filled with recycled low-density polyethylene (rLDPE) on the chemical, physical, mechanical, and thermal behaviour of the developed biocomposites. In this study, we aim to investigate the filler-polymer compatibility in biocomposites by employing novel strategies for the functionalisation of OP filler and/or rLDPE matrix. Specifically, four cases are considered: untreated OP filled rLDPE (Case 1), treated OP filled rLDPE (Case 2), treated OP filled functionalised rLDPE (Case 3), and treated and functionalised OP filled functionalised rLDPE (Case 4). In general, the evaluation of the performance of biocomposites facilitated the application of OP industrial waste as an eco-friendly reinforcing agent for rLDPE-based biocomposites. Furthermore, surface treatment and compatibilisation improved the properties of the developed biocomposites over untreated filler or uncoupled biocomposites. Besides that, the compatibilisers used aided in reducing water uptake and improving thermal behaviour, which contributed to the stability of the manufactured biocomposites.
Language	English
Publishing date	2021-10-11
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2527146-5
ISSN	2073-4360 ; 2073-4360
ISSN (online)	2073-4360
ISSN	2073-4360
DOI	10.3390/polym13203486
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Dynamic spring constants of higher resonance modes of uniform and tapered microcantilevers with tip masses

Mahmoud, M.A

Micron. 2020 Feb., v. 129

2020

Abstract	A comprehensive data set is presented that covers eigenvalues and dynamic stiffness of width-tapered microcantilevers for a wide range of the taper ratio and tip mass ratios. Closed form expressions are presented, which could help designers and researchers in the MEMS field in general, and atomic force microscopy in particular.
Keywords	atomic force microscopy ; data analysis ; data collection ; mathematics
Language	English
Dates of publication	2020-02
Publishing place	Elsevier Ltd
Document type	Article
ZDB-ID	207808-9
ISSN	1878-4291 ; 0047-7206 ; 0968-4328
ISSN (online)	1878-4291
ISSN	0047-7206 ; 0968-4328
DOI	10.1016/j.micron.2019.102795
Database	NAL-Catalogue (AGRICOLA)

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Zs.A 1927: Show issues

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Article ; Online: Development and validation of novel equation for prediction of resting energy expenditure in active Saudi athletes.

Abulmeaty, Mahmoud M A / Almajwal, Ali / Elsayed, Mervat / Hassan, Heba / Aldossari, Zaid / Alsager, Thamer

Medicine

2024 Volume 102, Issue 52, Page(s) e36826

Abstract: Being the most stable component of energy expenditure, resting metabolic rate (RMR) is usually used in the calculation of energy requirements for athletes. An adequate energy prescription is essential in supporting athlete development. This work aims to ... ...

Abstract	Being the most stable component of energy expenditure, resting metabolic rate (RMR) is usually used in the calculation of energy requirements for athletes. An adequate energy prescription is essential in supporting athlete development. This work aims to develop and validate an equation for calculating energy requirements for Arabic Saudi athletes. This cross-sectional study included 171 active athletes aged 18 to 45 years. The sample was divided into a development group (n = 127) and a validation group (n = 44). Anthropometry, indirect calorimetry, and body composition analysis via bioelectric impedance analysis were performed on all participants. The novel predictive equations were created by using stepwise linear regression analyses. The accuracy of the novel equations was compared with 10 equations, and Bland and Altman plots were used to estimate the limits of agreement between measured RMR and novel equations. The first novel equation used a set of basic measures, including weight, gender, and age, was [RMR = 1137.094 + (Wt × 14.560)-(Age × 18.162) + (G × 174.917)] (R = 0.753, and R2 = 0.567, wt = weight, G = gender; for male use 1 and female 0). The second equation used fat-free mass, age, and weight [RMR = 952.828 + (fat-free mass × 10.970)-(Age × 18.648) + (Wt × 10.297)] (R = 0.760 and R2 = 0.577). Validation of the second novel equation increased the prediction of measured RMR to 72.7% and reduced the amount of bias to 138.82 ± 133.18 Kcal. Finally, the new set of equations was designed to fit available resources in clubs and showed up to 72.73% accurate prediction and good agreement with measured RMR by Bland and Altman plots.
MeSH term(s)	Humans ; Male ; Female ; Basal Metabolism ; Cross-Sectional Studies ; Saudi Arabia ; Athletes ; Energy Metabolism ; Body Composition ; Calorimetry, Indirect ; Body Mass Index
Language	English
Publishing date	2024-01-11
Publishing country	United States
Document type	Journal Article
ZDB-ID	80184-7
ISSN	1536-5964 ; 0025-7974
ISSN (online)	1536-5964
ISSN	0025-7974
DOI	10.1097/MD.0000000000036826
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Resting Metabolic Rate and Substrate Utilization during Energy and Protein Availability in Male and Female Athletes.

Abulmeaty, Mahmoud M A / Almajwal, Ali / Elsayed, Mervat / Hassan, Heba / Alsager, Thamer / Aldossari, Zaid

Metabolites

2024 Volume 14, Issue 3

Abstract: Active athletes frequently develop low energy (LEA) and protein availabilities (LPA) with consequent changes in the vital metabolic processes, especially resting metabolic rate (RMR) and substrate utilization. This study investigated the association of ... ...

Abstract	Active athletes frequently develop low energy (LEA) and protein availabilities (LPA) with consequent changes in the vital metabolic processes, especially resting metabolic rate (RMR) and substrate utilization. This study investigated the association of energy and protein intakes with RMR and substrate utilization in male and female athletes and those with LEA and LPA. Sixty athletes (35% female, 26.83 ± 7.12 y) were enrolled in this study. Anthropometric measurements and body composition analysis were reported to estimate fat-free mass (eFFM). Dietary intakes were recorded by two-day multiple-pass 24 h recall records and three-day food records and then analyzed by food processor software to calculate protein intake (PI) and energy intake (EI). Indirect calorimetry was used to measure RMR and percentages of substrate utilization. Activity-energy expenditure (AEE) was assessed by using an Actighrphy sensor for three days. Energy availability was calculated using the following formula (EA = EI - AEE/eFFM). The correlation of EI and PI with RMR and substrate utilization was tested with Pearson correlation. In the LEA group, both EI and PI correlated positively with RMR (r = 0.308, 0.355, respectively,
Language	English
Publishing date	2024-03-17
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2662251-8
ISSN	2218-1989
ISSN	2218-1989
DOI	10.3390/metabo14030167
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Mesoscopic Analysis of Rounded and Hybrid Aggregates in Recycled Rubber Concrete.

Kamel, Mahmoud M A / Fu, Yu / Feng, Xiaowei / Peng, Yijiang

Materials (Basel, Switzerland)

2023 Volume 16, Issue 19

Abstract: Recycled rubber concrete (RRC), a sustainable building material, provides a solution to the environmental issues posed by rubber waste. This research introduces a sophisticated hybrid random aggregate model for RRC. The model is established by combining ... ...

Abstract	Recycled rubber concrete (RRC), a sustainable building material, provides a solution to the environmental issues posed by rubber waste. This research introduces a sophisticated hybrid random aggregate model for RRC. The model is established by combining convex polygon aggregates and rounded rubber co-casting schemes with supplemental tools developed in MATLAB and Fortran for processing. Numerical analyses, based on the base force element method (BFEM) of the complementary energy principle, are performed on RRC's uniaxial tensile and compressive behaviors using the proposed aggregate models. This study identified the interfacial transition zone (ITZ) around the rubber as RRC's weakest area. Here, cracks originate and progress to the aggregate, leading to widespread cracking. Primary cracks form perpendicular to the load under tension, whereas bifurcated cracks result from compression, echoing conventional concrete's failure mechanisms. Additionally, the hybrid aggregate model outperformed the rounded aggregate model, exhibiting closer peak strengths and more accurate aggregate shapes. The method's validity is supported by experimental findings, resulting In detailed stress-strain curves and damage contour diagrams.
Language	English
Publishing date	2023-10-08
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2487261-1
ISSN	1996-1944
ISSN	1996-1944
DOI	10.3390/ma16196600
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Modeling of charged-particle multiplicity and transverse-momentum distributions in pp collisions using a DNN.

Shokr, E / De Roeck, A / Mahmoud, M A

Scientific reports

2022 Volume 12, Issue 1, Page(s) 8449

Abstract: A machine learning technique is used to fit multiplicity distributions in high energy proton-proton collisions and applied to make predictions for collisions at higher energies. The method is tested with Monte Carlo event generators. Charged-particle ... ...

Abstract	A machine learning technique is used to fit multiplicity distributions in high energy proton-proton collisions and applied to make predictions for collisions at higher energies. The method is tested with Monte Carlo event generators. Charged-particle multiplicity and transverse-momentum distributions within different pseudorapidity intervals in proton-proton collisions were simulated using the PYTHIA event generator for center of mass energies [Formula: see text]= 0.9, 2.36, 2.76, 5, 7, 8, 13 TeV for model training and validation and at 10, 20, 27, 50, 100 and 150 TeV for model predictions. Comparisons are made in order to ensure the model reproduces the relation between input variables and output distributions for the charged particle multiplicity and transverse-momentum. The multiplicity and transverse-momentum distributions are described and predicted very well, not only in the case of the trained but also in the case of untrained energy values. The study proposes a way to predict multiplicity distributions at a new energy by extrapolating the information inherent in the lower energy data. Using real data instead of Monte Carlo, as measured at the LHC, the technique has the potential to project the multiplicity distributions for different intervals at very high collision energies, e.g. 27 TeV or 100 TeV for the upgraded HE-LHC and FCC-hh respectively, using only data collected at the LHC, i.e. at center of mass energies from 0.9 up to 13 TeV.
Language	English
Publishing date	2022-05-19
Publishing country	England
Document type	Journal Article
ZDB-ID	2615211-3
ISSN	2045-2322 ; 2045-2322
ISSN (online)	2045-2322
ISSN	2045-2322
DOI	10.1038/s41598-022-11618-6
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Chemical Treatment of Bio-Derived Industrial Waste Filled Recycled Low-Density Polyethylene

Ishaq Sider / Mahmoud M. A. Nassar

Polymers, Vol 13, Iss 2682, p

A Comparative Evaluation

2021 Volume 2682

Abstract	The search for renewable alternatives for petroleum products that can be used in industrial applications is increasing. Each year, several tons of bio-derived industrial waste is produced and most of it is burned or placed in landfills. Olive pits (OP) have unique characteristics such as abundance, renewability, and biodegradability, which can be utilized to develop new types of biocomposites. One of the most promising uses of OP is that they can reinforce the mechanical properties of polymeric biocomposites. This study describes the preparation of recycled low-density polyethylene (rLDPE) that is filled with OP flour (10, 20, 30, and 40 wt.%) using a twin-screw extruder. The effects of the chemical treatment of the OP surface (sodium hydroxide (NaOH) and dimethyl sulfoxide (DMSO)) on the bio-filler/polymer compatibility along with the produced composite’s chemical, physical, mechanical, and thermal properties have been explored. Overall, the reinforced composites that were obtained with alkali-treated OP have better biocomposite properties. This indicates an improved compatibility between the bio-filler and matrix. The results are promising in terms of using OP flour in developing green composites.
Keywords	biocomposites ; filler/polymer compatibility ; chemical treatment ; industrial waste ; recycled polymer ; Organic chemistry ; QD241-441
Subject code	660
Language	English
Publishing date	2021-08-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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