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Adsorptive removal of methylene blue as organic pollutant by marble dust as eco-friendly sorbent
Mostafa M. Hamed,I.M. Ahmed,S.S. Metwally 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
Inexpensive and eco-friendly sorbent, marble dust, has been successfully utilized for the removal of some organic pollutants from aqueous solutions. The excessive release of organics into the environment is a major concern worldwide. Therefore, adsorption of methylene blue (MB), as an organic pollutant, onto low cost adsorbent from aqueous solutions was investigated. The adsorption of MB can be approximated more favorably by the pseudo-second-order model. Langmuir isotherm is applicable, the monolayer capacity was found to be 16.36 mg/g. The thermodynamic parameters were also determined. The obtained results indicated that, sorption was found to be rapid, 98% within 10 min.
A.A. Naser,S.S. Metwally,G.E. Sharaf El-deen,Ahmed A. Bhran,A.M. El-Kamash 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.32 No.-
Silica-based urea–formaldehyde (SiO2/UF) composite material was prepared and impregnated withorganophosphorus extractant, namely; 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester, forremoval of Eu3+ and Nd3+ from aqueous solutions. The sorption capacity of the impregnated SiO2/UF forEu3+ and Nd3+ were determined and found to be 3.1 and 2.8 meq/g, respectively. Pseudo-second-orderkinetic model is applicable and the sorption process is controlled by intra-particle diffusion mechanism. The values of thermodynamic parameters indicated that the sorption process is spontaneous and hasendothermic nature. The prepared impregnated composite is an efficient sorbent media andrecommended for removal of some lanthanide elements from aqueous solution
Naser Alkenani,S.R. Mahmoud,Ahmed M. Metwally,Afaf S. Alwabli,Habeeb M. Al-Solami 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.79 No.6
In the present paper, an analysis of elastic stability for mosquito fascicle with the elastic foundation is investigated by the variational iteration method. A mathematical model is established for the mosquito fascicle for the associated clamped and free boundary conditions. Results attained expert the stability condition of mosquito fascicle for given parameters. Design guidelines for the dynamically stable microneedle are developed and critically debated. A uniform homogeneous mosquito fascicle is considered to be restrained by labium along its length. The restraint considered in this work is an elastic foundation model by labium, and it is of great interest to bioengineering and foundation engineers. An analytical solution is not a simple procedure since the equations are highly nonlinear. This study presents the application of the variational iteration method for obtaining exact solutions for continuously restrained mosquito fascicle. The research proves that the variational iteration method is a very efficient and promising approach to understand the probing behavior of mosquitoes and the process of penetration.
Zaki, Seham Mahrous,Abdel-Azeez, Hala A.,El Nagar, Mona Roshdy,Metwally, Khaled Abdel-Aziz,Ahmed, Marwa M. Samir S. Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.3
Background: Fragile histidine triad (FHIT) gene is a tumor suppressor gene which involved in breast cancer pathogenesis. Epigenetics alterations in FHIT contributes to tumorigenesis of breast cancer. Objective: Our objective was to study FHIT promoter region hypermethylation in Egyptian breast cancer patients and its association with clinicopathological features. Materials and Methods: Methylation-specific polymerase chain reaction was performed to study the hypermethylation of FHIT promoter region in 20 benign breast tissues and 30 breast cancer tissues. Results: The frequency of hypermethylation of FHIT promoter region was significantly increased in breast cancer patients compared to bengin breast disease patients. The Odd's ratio (95%CI) of development of breast cancer in individuals with FHIT promoter hypermethylation (MM) was 11.0 (1.22-250.8). There were also significant associations between FHIT promoter hypermethylation and estrogen, progesterone receptors negativity, tumor stage and nodal involvment in breast cancer pateints. Conclusions: Our results support an association between FHIT promotor hypermethylation and development of breast cancer in Egyptian breast cancer patients. FHIT promoter hypermethylation is associated with some poor prognostic features of breast cancer.