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Rough neighborhood ideal and its applications
Abdel Fatah A. Azzam 한국지능시스템학회 2024 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.24 No.1
In this study, we present a novel notion of an approximation space based on the idea of an ideal,called the rough neighborhood ideal, and its properties. Additionally, we combine two areasin which decision-making precision is improved using rough ideal expansions. An applicationscenario was presented to show how decision-making accuracy increased for COVID-19diagnosis. We also use variable precision to improve the accuracy of decision-making. Finally,we compared our strategy with another strategy.
Failure Investigation of Fire-Side Water-Wall Tube Boiler
( M. C. Fatah ),( D. Agustiadi ),( A. W. Pramono ) 한국부식방식학회 2021 Corrosion Science and Technology Vol.20 No.5
Unforeseen failures of boilers in power plants may affect the continuation of electricity generation. Main failures in boilers are influenced by the tube material, tube position, boiler service temperature and pressure, and chemical composition of the feed water and coal. This investigation was intended to find answers on the causes and mechanism of failure of the fire-side boiler water-wall tubes, due to perforation and corrosion. The tube conformed to the material requirements in terms of its chemical composition and hardness. Microscopic examination showed ferrite and pearlite indicating no changes in its microstructure due to the temperature variation. SEM test showed a single layer and homogenous film density particularly on the area far from perforation. However, layers of corrosion product were formed on the nearby perforation area. EDX showed that there were Na, Ca, S, and O elements on the failed surface. XRD indicated the presence of Fe<sub>2</sub>O<sub>3</sub> oxide. The failure mechanism was identified as a result of significant localized wall thinning of the boiler water wall-tube due to oxidation.
An Overview of Seabed Storage Methods for Pipelines and Other Oil and Gas Equipment
( M. C. Fatah ),( A. Mills ),( A. Darwin ),( C. Selman ) 한국부식방식학회 2017 Corrosion Science and Technology Vol.16 No.2
In the construction of subsea oil and gas developments, it is increasingly common that subsea oil and gas equipment will be installed in subsea well before final hookup and production. Installation of wellheads, subsea hardware, pipelines, and surface facilities (platforms, FPSO, FLNG, connected terminals, or gas plants) are increasingly driven by independent cost and vessel availability schedules; this gives rise to requirements that the subsea facilities must be stored in the seabed for a specific time. In addition, schedule delays, particularly in the installation or startup of the connected platform, FPSO, FLNG, or onshore plant may cause unexpected extensions of the intended storage period. Currently, there are two methods commonly used for storage subsea facilities in the seabed: dry parking and wet parking. Each method has its own risks, challenges, and implications for the facility life and its integrity. The corrosion management and preservation method selection is a crucial factor to be considered in choosing the appropriate storage method and achieving a successful seabed storage. An overview of those factors is presented, along with a discussion on the internal corrosion threats and assessments.
Ouf, Abd El-Fatah M.,Ali, Mayada S.,Soliman, Mamdouh S.,El-Defrawy, Ahmed M.,Mostafa, Sahar I. Korean Chemical Society 2010 대한화학회지 Vol.54 No.4
New complexes cis-[$Mo_2O_5(Hapdhba)_2$], trans-[$UO_2(Hapdhba)_2$], [Pd(Hapdhba)Cl($H_2O$)], [Pd(bpy)(Hapdhba)]Cl, [Ag(bpy)(Hapdhba)], [$Ru(Hapdhba)_2(H_2O)_2$], [$Rh(Hapdhba)_2Cl(H_2O)$] and [Au(Hapdhba)$Cl_2$] are reported, where $H_2$apdhba is the Schiff-base derived from 2-aminopyrimidine and 2,4-dihydroxy benzaldehyde. The complexes were characterized by IR, electronic, $^1H$ NMR and mass spectra, conductivity, magnetic and thermal measurements. The inhibitive effect of $H_2$apdhba for the corrosion of copper in 0.5 M HCl was also determined by potentiodynamic polarization measurements. 새로운 착물인 cis-[$Mo_2O_3(Hapdhba)_2$], trans-[$UO_2(Hapdhba)_2$], [Pd(Hapdhba)Cl($H_2O$)], [Pd(bpy)(Hapdhba)]Cl, [Ag(bpy) (Hapdhba)], [$Ru(Hapdhba)_2(H_2O)_2$], [$Rh(Hapdhba)_2Cl(H_2O)$] 및 [Au(Hapdhba)$Cl_2$]를 보고한다. 여기서 $H_2$apdhba는 2-aminopyrimidine 및 2,4-dihydoxybenzaldehyde에서 비롯된 Schiff-염기이다. 이들 착물은 IR, UV-Vis 그리고 질량 스펙트럼을 비롯하여 전기전도도, 자기 및 열 분석을 통해 특성을 조사하였다. 구리의 부식에 대한 $H_2$apdhba의 방해효과는 0.5 M HCl에서 potiodynamic polarization 측정을 통해 조사하였다.
( Bahaa El-dein El-sayd Abd El-fatah ) 한국육종학회 2018 Plant Breeding and Biotechnology Vol.6 No.3
Five concentrations of 2,4-dichlorophenoxyacetic acid (2,4-D) and three combinations of indole-3-acetic acid (IAA) and benzyl-amino purine (BA) were used to analyze response to mature-embryo culture for six genotypes of wheat (Triticum aestivum L.) The differences between genotypes as well as between the concentrations of hormones were significant for three tissue culture traits, namely callus formation (C.%), embryogenic calli (E.C.%) and plant regeneration per embryogenic callus (No. Sh/E.C.). Murashige and Skoog basal medium (MS) supplemented with 7 mg/L 2,4-D showed the highest percentage of callus formation while the highest percentage of embryogenic calli (% of E.C.) was obtained on MS medium supplemented with 4 mg/L 2,4-D. MS medium containing 0.1 mg/L IAA and 1 mg/L BA exhibited the highest number of plant regeneration (No. Sh/E.C.). A half diallel mating was designed to produce 15 crosses among six genotypes. Mean square of the diallel analysis of variance indicated highly significant differences among the parents and F1 hybrids for E.C.% and No. Sh/E.C. traits. The results revealed that Lin-6 (P4) was the best combiner for E.C.% and No. Sh/E.C. Estimates of narrow-sense heritability were 83.1% and 69.0% for E.C.% and No. Sh/E.C., respectively. The genetic diversity among six wheat genotypes was analyzed using three tissue culture traits, 10 agro-morphological traits and three molecular marker systems. The Mantel test showed a positive and significant correlation between tissue culture traits studied and each of agro-morphological traits and molecular marker systems.
Protective effect of Arthrospira platensis against liver injury induced by copper nanoparticles
Reham Ebaid,Abd El-Fatah Abomohra,Elhussainy Elhussainy,Safinaz El-Shourbagy,Sameh Ali 경희대학교 융합한의과학연구소 2017 Oriental Pharmacy and Experimental Medicine Vol.17 No.3
Although copper oxide nanoparticles (nano-CuO) are one of widely used engineered nanoparticles, their human and animal exposure led to particular structural changes in tissues and organs. The present study was undertaken to examine the protective effects of the blue-green microalga Arthrospira platensis against nano-CuO-induced hepatotoxicity in albino rats. Results showed that nano-CuO injection led to significant reduction in serum albumin level with a significant increase in alanine transaminases (ALT) and aspartate transaminases (AST) activities after 24 h of administration. In addition, nano-CuO administration resulted in significant increase in malondialdehyde (MDA) level and catalase (CAT) activity, with a significant reduction in reduced glutathione (GSH) level. Administration of A. platensis alone did not significantly alter the normal levels of aminotransferase enzymes, antioxidants or oxidative stress marker. However, pretreatment with A. platensis prior to nano-CuO intoxication attenuated the levels of ALT, AST (liver function markers) and MDA (lipid peroxidation marker). It also normalized the levels of both hepatic enzymatic and non-enzymatic antioxidants (CAT and GSH, respectively). In conclusion, the present study confirmed the hepatotoxicity of nano-CuO at 10 mg kg−1 administration dose. However, administration of A. platensis could represent a significant protective mechanism against hepatotoxicity.
Effects of glass bead size, vortexing speed and duration on Eimeria acervulina oocyst excystation
Cha, Jang-Ock,Talha, Abul Fatah Shah Muhammad,Lim, Chae Woong,Kim, Bumseok Elsevier 2014 Experimental parasitology Vol.138 No.-
Improved methods for efficient excystation of Eimeria should be developed and standardized for future Eimeria-related studies. Here, the effects of different glass bead sizes (0.5, 1, 2, and 2.5 mm), and various vortex speeds (1000, 2000, and 3000 rpm) and durations (30s, 1, 3, and 5 min) have been examined for Eimeria (E.) acervulina oocyst excystation. At 3000 rpm, all glass beads, regardless of size, efficiently ruptured E. acervulina oocysts at 5 min. At 2000 and 3000 rpm, all four glass bead sizes increasingly ruptured oocysts in a time-dependent manner. In contrast, at 1000 rpm the excystation efficiency was not related with the glass bead size or with vortexing duration. It appeared that the 1 mm glass beads are most efficient for E. acervulina DNA extraction at a 3000 rpm vortexing speed for 3 and 5 min. The 2 mm glass beads delicately released the highest number of intact sporocysts at 2000 rpm for 3 min. Therefore, our data can provide valuable information for the efficient mechanical excystation of E. acervulina. (C) 2014 Elsevier Inc. All rights reserved.