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- 저자 : Mahrous Ali Mohammed Ali (검색결과 5 건)
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Utilization of Cement Kiln Dust in Industry Cement Bricks
Mahrous Ali Mohammed Ali,양형식 한국자원공학회 2011 Geosystem engineering Vol.14 No.1
Solid waste management is one of the major environmental concerns around the world. Cement kiln dust (CKD), also known as by-pass dust, is a by-product of cement manufacturing. The environmental concerns related to Portland cement production, specifically emissions to the atmosphere and the disposals of CKD are becoming progressively significant. CKD is fine-grained, particulate material chiefly composed of oxidized, anhydrous, micron-sized particles collected from electrostatic precipitators during the high temperature production of clinker. Some of the cement kiln dust that is generated is reused in the cement plant and some is landfilled. Recently, there have been trends of utilizing it for soil stabilization and treatment of sewage. The beneficial uses of CKD include serving as filler material in highway construction and maintenance and as a component of cement mortar/concrete. Also, attempts have been made to use it to make cement bricks for use in industrial construction, and this paper provides a review of the results and issues associated with this use. The paper reports the results of tests conducted by the authors to investigate the properties of cement-CKD combinations and the extent to which such combination are used to manufacture cement bricks. All of the properties of the bricks that were tested found to be satisfactory according to the Egyptian Code, e.g., compressive strength was satisfactory in the range of 59.9 to 213.3kg/cm2, water absorption was directly increased from 3.8 to 5.9% and the density ranged between 2.1 and 2.2 gm/cm3 with different percentage of cement kiln dust from 0 to 40%. In comparing the different types of bricks and their costs, this study found that cement bricks that include CKD as a component had acceptable properties and cost far less than other types of bricks. In addition, the use of CKD in the bricks precludes the need to dispose large quantities of this material in landfill.
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Farghaly Mohamed G.,Ali Mahrous,Kim Jong-Gwan 한국자원공학회 2021 Geosystem engineering Vol.24 No.3
This paper discusses a model that can optimize plant operation by considering transportation cost and metallurgical assays. All boundary conditions were set using ore samples taken from different locations in the same mine. Transportation from the mine to milling plants, dumping areas, and leaching units is also analyzed. Transportation from the mill to the smelter depends on assay results to ensure market readiness. We hypothesize that the grade of the material varies according to its source because milling plants are built to process different types of ore. Mines and processing units may be far apart, and therefore, it is critical to optimize production. Previous studies have discussed mine production optimization but did not consider metallurgical plants. The proposed model merges all units of a production system to determine the optimal planning solution. Linear programming uses network formulations of planning problems to consider a combination of mining and metallurgy operations. This technology is useful for analyzing the combination of two major systems, and hence, the dual theory was used in formulating the problem. The final model was applied to minimize the costs of production and distribution. The study checked the optimality of the solution for accuracy and its use as an indicator for long-term planning.
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Elsamany, Shereef Ahmed,Alzahrani, Abdullah Saeed,Mohamed, Mervat Mahrous,Elmorsy, Soha Ali,Zekri, Jamal Eddin,Al-Shehri, Ahmed Saleh,Haggag, Rasha Mostafa,Alnagar, Ahmed Abdel-Reheem,El Taani, Hani A Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.13
Background: The prognosis of young colorectal cancer (CRC) patients has been addressed by several studies but with contradictory results. The aim of the present study was to evaluate the clinico-pathological features of young Saudi patients with CRC in addition to displaying their survival outcome. Materials and Methods: In this retrospective study, young CRC patients (${\leq}40$ years) diagnosed between 2007 and 2011 from 4 centres in western Saudi Arabia, were included. Clinico-pathological features, tumor markers, dates of disease relapse and death were collected. Survival parameters were compared with those of older Saudi patients, reported in previous studies. Results: One hundred and sixteen young patients with CRC were identified (32.2% rectal, 67.8% colon). Some 44% were metastatic while 32.7% had stage III at diagnosis. Patients with grade 3 tumors made up 29.4% of the total while 49.5% had positive lymphovascular invasion (LVI), 56% had a lymph node (LN) ratio ${\geq}0.2$ and 40.2% were K-ras mutant. Median disease-free survival (DFS) and overall survival (OS) in non-metastatic cases were 22.8 and 49.6 months respectively with better median DFS in K-ras wild compared to mutant patients (28.5 vs 20.9 months, p=0.005). In metastatic cases, median OS was 19.5 months. These survival outcomes are inferior compared to those of older Saudi patients reported in prior studies. Conclusions: Young CRC patients present more commonly with advanced stage and a high incidence of adverse prognostic factors such as LVI and high LN ratio. Young CRC patients seem to have worse survival compared to older Saudi patients.
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Abdellah Wael R.,Kim Jong-Gwan,Hassan Mohamed M.A.,Ali Mahrous A. M. 한국자원공학회 2022 Geosystem engineering Vol.25 No.2
Digital transformation (DT) is defined as a strategy for boosting mining assets by attempting significant changes to of own properties through the integration of communication, data computing, and property technologies. Making large-scale changes will be difficult with digital technology, especially if the business is not well-positioned to do so. Increasing cybersecurity protection levels is the most effective way to ensure the success of the transformation. When making significant changes, a clear digital vision should be outlined and implemented with strong leadership. However, the majority of digital transformation initiatives fail before they are completed. The problem does not just affect the mining industry. The purpose of this paper is to investigate the major challenges encountered in digital transformation projects and to propose a strategic solution for implementing and scaling digital initiatives.
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Study of Thin Double-Gap RPCs for the CMS Muon System
K. S. Lee,S. W. Cho,S. Choi,B. Hong,M. Kang,J. H. Lim,Y. M. Jo,S. K. Park,K. R. Ryoo,R. Aly,S. Aly,Y. Assran,A. Mohamed,A. Mahrous,S. Constantini,M. Abbrescia,A. Gelmi,M. Maggi,G. Iaselli,G. Pugliese 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.73 No.8
High-sensitivity double-gap phenolic resistive plate chambers (RPCs) are studied for the Phase-2 upgrade of the Compact Muon Solenoid (CMS) muon system at high pseudorapidity . Whereas the present CMS RPCs have a gas gap thickness of 2 mm, we propose to use thinner gas gaps, which will improve the performance of these RPCs. To validate this proposal, we constructed double-gap RPCs with two different gap thicknesses of 1.2 and 1.4 mm by using high-pressure laminated plates having a mean resistivity of about 5 1010 -cm. This paper presents test results using cosmic muons and 137Cs gamma rays. The rate capabilities of these thin-gap RPCs measured with the gamma source exceed the maximum rate expected in the new high- endcap RPCs planned for future Phase-2 runs of the Large Hadron Collider (LHC).
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