El Minya Higher Institute of Engineering and Technology
Recent publications
Corrugated steel-plate girders are used as structural elements in many applications because of their properties, cutouts are always provided in these plate elements to enable inspection and servicing. This study presents an experimental and analytical study to investigate the efficiency of a steel-plate girder with corrugated webs (GCWs) and flat webs (GFWs) having cutouts under shear loading. In this study, we investigated the influence of some important parameters on the girders’ load-bearing capacity. The experimental program was conducted on six full-scale plate girders, which have been tested under central load at mid-span. The analysis was conducted using ANSYS V20 to perform a nonlinear technique for the determination of the ultimate load of the tested girders. Finally, experimental and finite element model were used to define the ratio of increasing carrying capacity in plate girder with flat and corrugated web, having cutout under shear loading. The ultimate strength, failure mechanism, and load-deflection curves from the experimental and analytical study show that the shear capacity of the girder with corrugated web girders extends loads by 22 % compared with the flat web.
Convection across circular concentric gaps between cylinders is crucial in industrial applications, including electronic cooling, heat exchangers, and solar collectors. The effect of longitudinal and annular grooves on the outside surface of the inside tube on natural convective heat transmission in enclosure concentric circular annulus is experimentally investigated in the present work. Twin pairs of circular aluminum cylinders with the same radius ratio, length, and surface area were examined. Each one consists of two concentric circular cylinders. To maintain a steady heat flux, the inside cylinder of each pair has an electrical heater connected. The results indicate that the increases in the Nusselt number of around 25%, 43%, 67%, 123%, 142%, 157%, and 172% are seen for groove depths of 0.05 cm, 0.10 cm, 0.15 cm, 0.20 cm, 0.25 cm, 0.3 cm, 0.35 cm, and 0.4 cm. In addition, increasing the depth of the longitudinal groove raises the Nusselt number by roughly 33%, 51%, 79%, 99%, 136%, 153%, 173%, and 184%. The longitudinal grooves with a depth of 4.0 mm enable a 38% increase in free convection over prior research. An annular groove of 4.0 mm depth increases free convection by 36%. Furthermore, a further advancement over earlier research is attributable to the extensive surface contact area of the inner cylinder made possible by longitudinal or annular grooves. ARTICLE HISTORY
Transition metals are usually applied for activating persulfate to degrade organic contaminants efficiently, and there are numerous researches utilizing bimetallic catalysts to harvest the higher performance. Mechanisms of reactive oxygen species (ROS) generation as well as the mutual transformation of bimetal have been reported a lot, yet the deviation of ROS contribution for contaminants degradation and the relevant role of metals seem to be explored deficiently. Herein, biochar decorated with bimetal of Co/Fe (Fe1/4Co1/2-PWBC600) was prepared for peroxymonosulfate (PMS) activation and oxytetracycline (OTC) degradation, and properties of catalysts were analyzed for elaborating the intrinsic difference of ROS generation. Results showed that the structure of ROS contribution was optimized in Fe1/4Co1/2-PWBC600/PMS system, and the co-dominance of SO4•‒ and ¹O2 realized the better OTC degradation performance compared with the merely cobalt-based catalyst. Besides, durability tests showed that Fe1/4Co1/2-PWBC600 performed much better in oxidation resistance and reusability, which was owing to the co-dominance effect and the consumption buffering of oxygen vacancies. This work offered a new insight into the synthesis of bimetallic catalysts to strengthen the properties pertinently, realizing the higher performance of pollutants degradation and catalyst lifetime.
The uprising era of technological applications seeks solutions that facilitate daily life activities. Sensors with their different types provide fast and reliable information. The employment of graphene oxide in these sensors complies with the general requirement for sensor's functionalization and easily achieves the purpose for which the sensor was prepared. In this report, we have synthesized rGO/SnO 2 /Co 3 O 4 composite with a star-like structure through a facile chemical route. The mentioned structure was employed as a temperature sensor within a temperature range of 25–125 °C and a wide span of relative humidity values. In order to assess the quality of preparation and the sensing ability, the composite was inspected by the following techniques: XRD, FTIR, SEM, and thermal analysis in addition to the sensing measurements. The XRD results affirmed the successful incorporation of the SnO 2 /Co 3 O 4 onto the rGO with 18 nm average crystallite size. The SEM results revealed the characteristic star-like structure with a mean length of 100 nm. The main functional groups are reflected in the FTIR results. The outcomes elucidated a linear response between the resistance and temperature, where the temperature coefficient of resistance is estimated to be 0.006/°C. These results confirm the validity of this structure for temperature sensing applications.
Corrugated steel plate girders are widely used as structural elements in many fields because they have excellent properties; cutouts are often provided in these plate elements to enable inspection and servicing. This paper presents an experimental and analytical study for investigating the efficiency of a steel plate girder with corrugated webs (GCWs) and a girder with flat webs (GFWs) having cutouts under shear loading. In this paper, the influence of some important parameters on the load-bearing capacity of the girders is investigated. The experimental program was conducted on six full-scale plate girders that were tested under central load at midspan. Using ANSYS V20, nonlinear analysis for determining the ultimate load for the tested girders is performed. Finally, using the experimental method and finite element method, the load-carrying capacities of the plate girders having flat webs with the plate girders having corrugated webs with cutouts under shear loading are compared. The results obtained in terms of the ultimate strength, failure mechanism, and load deflection curves were compared with the results obtained from both the experimental and analytical studies. The shear capacity of the GCWs was better and tolerated loads 22% more than GFWs.
The effect of sodium metamizole as a corrosion inhibitor for carbon steel (CS) in 1 M hydrochloric acid at various concentrations was studied by using chemical (weight loss, WL) and electrochemical [electrochemical frequency modulation (EFM), electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP)] methods. The results of WL showed that the effectiveness of sodium metamizole as a CS preservative in a hydrochloric acid solution at room temperature raised by improvement of the concentration of the inhibitor and reached 82.87% at 300 ppm and 25 °C. The effect of temperature on the CS was studied and the thermodynamic parameters of activation and adsorption were computed and discussed. The results showed that the inhibition efficiency (IE) decreases with increasing temperature, suggestive of physisorption. This was collaborated by values of activation energy, which are all below 80 kJ mol⁻¹ and free energy which are below 20 kJ mol⁻¹. The adsorption mechanism was coherent with Langmuir adsorption model. Results of the PDP revealed that the inhibitor was adsorbed on CS surface by mixed type of behavior. Furthermore, EIS revealed the dip in the values of double-layer capacitance and improvement in the charge transfer resistance with increased dose of sodium metamizole. Surface examinations were performed using altered techniques. The theoretical studies were calculated to confirm the validity of the practical results and the results of both were compared with each other, demonstrating the validity of the results obtained.
Flash floods threaten the lives of people and properties in different regions around the world, especially in arid and semi-arid regions due to infrequent flood events. The current study aims to assess the geomorphological parameters of Wadi Sudr, South Sinai in Egypt to evaluate flash flood risks and provide adequate mitigation methods. This study presents an integrated method that combines geographic information system (GIS) and watershed modeling system (WMS) with HEC-HMS to visualize and assess flood events in the study area. Different morphologic parameters of the watershed were determined, including linear, areal, and relief parameters. GIS was used to analyze the satellite images and determine the characteristics of the valley to get the extension and number of stream orders in the valley, then WMS was used to estimate rainstorms and basin characteristics, as well as estimate the amount of rain that causes flooding. HEC-HMS program was used for hydrological demonstration and precipitation overflow estimation. The morphometric analysis provided a quantitative portrayal of the Wadi Sudr watershed. Wadi Sudr has 4029 streams connected with seventh order of streams spread over an area of 547.45 km2. Based on the results of morphologic and hydraulic parameters of the watershed, two locations of protection dams were suggested. A comparison between the two locations was made to select the best location based on some criteria, including storage capacity, water depth behind the dam, width and shape of the valley, and the area covered by water stored in the reservoir. The comparison between the two locations showed that the first location is more appropriate for dam construction based on the examined criteria. The valley shape in the first location is more regular than in the second. The first location provided higher storage capacity and water depth in front of the dam than the second. The area covered by water and the width of the valley is less than the second. The stability of the dam at the first site could be higher and the cost of construction could cost be less than the second due to these reasons. A comparison was made using the weighted linear combination (WLC) method, which consists of 13 criteria to determine the suitability index (SI) in order to select the best location from the proposed locations. SI proved that the first location is better than the second. The designed dam in the selected site could be cost-efficient to protect the study area from flood risks and harvesting water that can be used in different purposes. This methodology can be applied in different areas for mitigating flash flood risks.
This paper introduces the applications of renewable energy in contributing to the improvement of the electrical system of the nuclear power plant, specifically with regard to energy sources in case of emergency to ensure that there is no malfunction in the cooling systems after unplanned shutdown. The Fukushima accident had an impact on reassessing the design of the electrical systems of nuclear power plants to avoid partial or complete blackout of the nuclear power plants because of its effects on the environment and the population. We proposed a new design to add Wind/PV/Battery power system to the electrical emergency system to enhance the safety and reliability of the electrical emergency systems. This hybrid energy system is used to feed the loads in the event of different scenarios such as startup, normal operation, planned shutdown and unplanned shutdown of the station and the interruption of traditional sources of the Egyptian first nuclear power plant at El-Dabaa site (1200 MWe). The proposed Renewable energy systems are designed and analyzed using electrical transient and analysis program (ETAP), version 19.0.1, assuming different load flow audit scenarios. The study has proven the extent to which renewable energy can be used to ensure the safety functions and protect the nuclear power plant in the event of complete blackout.
The purpose of this article is to define a new general weighted class of hyperholomorphic functions, the so called Bα,ωq(G) Spaces. For this class we obtain characterizations by weighted Bloch Bωα spaces. Moreover, we characterize the hyperholomorphic Bα,ωq(G) functions by the coefficients of certain lacunary series expansions in Clifford analysis.
In this work, we presented the type I half logistic Burr-Weibull distribution, which is a unique continuous distribution. It offers several superior benefits in fitting various sorts of data. Estimates of the model parameters based on classical and nonclassical approaches are offered. Also, the Bayesian estimates of the model parameters were examined. The Bayesian estimate method employs the Monte Carlo Markov chain approach for the posterior function since the posterior function came from an uncertain distribution. The use of Monte Carlo simulation is to assess the parameters. We established the superiority of the proposed distribution by utilising real COVID-19 data from varied countries such as Saudi Arabia and Italy to highlight the relevance and flexibility of the provided technique. We proved our superiority using both real data.
Nowadays, in parallel to the appearance of the COVID-19 virus, the risk of viruses in water increases leading to the necessity of developing novel disinfection methods. This review focuses on the route of virus contamination in water and introduces non-thermal plasma technology as a promising method for the inactivation of viruses. Effects of essential parameters affecting the non-thermal discharge for viral inactivation have been exposed. The review has also illustrated a critical discussion of this technology with other advanced oxidation processes. Additionally, the inactivation mechanisms have also been detailed based on reactive oxygen and nitrogen species.
One of the popular techniques in forensic anthropology, known as "facial approximation" or "craniofacial reconstruction," models the appearance of the face from the skeletal remains. The average facial soft tissue thicknesses (FSTTs) with regard to sex and population affinity are necessary for a successful craniofacial reconstruction. The focus of this study is on the existence of sex-related changes in facial soft tissue composition. It offers the first data on FSTTs for the living Egyptian population utilizing cone beam computed tomography (CBCT) and also enriches the published FSTTs data for the Egyptian population, which could offer more accurate cranial reconstruction. Sex, age, and body mass index (BMI) were considered. From the repository, 10 adult males and 10 adult females were chosen from the repository according to a careful selection criteria.
Potentiodynamic polarization (PP) and electrochemical impedance spectroscopy (EIS), tests, mass loss (ML) and Hydrogen evolutions (HE) methods were used to examine the effects of the newly plant extracted compound (Cystosiera myrica). All these quantities exhibited that the effectiveness of inhibition increase with a rise in inhibitor concentration and with a rise in temperature. Polarization curves displayed that the inhibitor studied was an inhibitor of a mixed kind. Langmuir isotherm was attained for the adsorption of the inhibitor on the Aluminum surface. Thermodynamic parameters were determine and deduced such as activation enthalpy (ΔH*), activation entropy (ΔS*), adsorption equilibrium constant (Kads) and free adsorption energy (Goads) have been measured. UV/visible spectral, Attenuated Total Reflection Infra-Red (ATR-IR) and Atomic Force Microscopy (AFM) tested have observed the effect of this inhibitor on Al surface morphology. All other data approaches were compatible and in line with each other.
In many nations, particularly those experiencing water scarcity, novel approaches are being applied to clean wastewater. Heterogeneous photocatalysis is the most widely used of these approaches because it entails the decomposition of organic molecules into water and carbon dioxide, which is a more ecologically benign process. In our study, we studied the photocatalytic degradation process on the effluent flumequine. This treatment is made through a solar pilot reactor in the presence of immobilized titanium dioxide with three light intensities and two types of water as solvents. A variety of factors that might influence the rate of deterioration, such as flow rate, light intensity, and initial concentration, have been investigated. The maximal degradation of flumequine was achieved at more than 90% after 2.5 h under optimal conditions (an initial concentration of 5 mg/L, three lamp light intensities, and a flow rate of 29 L/h). By combining the oxidized agent H2O2 with this process, the photocatalytic activity was improved further to 97% under the same conditions. The mineralization of this product has also been tested using total organic carbon (TOC) analysis. A high mineralization rate has been recorded at around 50% for a high initial concentration (20 mg/L) at a flow rate of 126 L/h. The results demonstrated the highly effective removal of flumequine and the efficacy of this photocatalytic system.
The development of ultra-high-performance concrete (UHPC) is still practically limited due to the scarcity of robust mixture designs and sustainable sources of local constituent materials. This study investigates the engineering characteristics of Styrene Butadiene Rubber (SBR) polymeric fiber-reinforced UHPC with partial substitution of cement at 0, 5 and 20 wt.% with latex polymer under steam and air curing techniques. The compressive and tensile strengths along with capillary water absorption and sulfate resistance were measured to evaluate the mechanical and durability properties. Scanning Electron Microscopy (SEM) was carried out to explore the microstructure development and hydration products in the designed mixtures under different curing regimes. The results indicated that the mixtures incorporating 20 wt.% SBR polymer achieved superior compres-sive strength at later ages. Additionally, the tensile strength of the polymeric UHPC without steel fibers and with 20% polymers was enhanced by 50%, which promotes the development of novel UHPC mixtures in which steel fibers could be partially replaced by polymer, while enhancing the tensile properties.
Electrical power networks are expanded regularly to meet growing energy requirements. Reactive power dispatch (RPD) optimization is a powerful tool to enhance a system’s efficiency, reliability, and security. RPD optimization is classified as a non-linear and non-convex problem. In this paper, the RPD optimization problem is solved based on novel hybrid genetic algorithms—equilibrium optimizer (GAEO) optimization algorithms. The control variables are determined in such a way that optimizes RPD and minimizes power losses. The efficiency of the proposed optimization algorithms is compared to other techniques that have been used recently to solve the RPD problem. The proposed algorithm has been tested for optimization RPD for three test systems, IEEE14-bus, IEEE-30bus, and IEEE57-bus. The obtained results show the superiority of GAEO over other techniques for small test systems, IEEE14-bus and IEEE-30bus.
Survival analysis is a collection of statistical techniques which examine the time it takes for an event to occur, and it is one of the most important fields in biomedical sciences and other variety of scientific disciplines. Furthermore, the computational rapid advancements in recent decades have advocated the application of Bayesian techniques in this field, giving a powerful and flexible alternative to the classical inference. The aim of this study is to consider the Bayesian inference for the generalized log-logistic proportional hazard model with applications to right-censored healthcare data sets. We assume an independent gamma prior for the baseline hazard parameters and a normal prior is placed on the regression coefficients. We then obtain the exact form of the joint posterior distribution of the regression coefficients and distributional parameters. The Bayesian estimates of the parameters of the proposed model are obtained using the Markov chain Monte Carlo (McMC) simulation technique. All computations are performed in Bayesian analysis using Gibbs sampling (BUGS) syntax that can be run with Just Another Gibbs Sampling (JAGS) from the R software. A detailed simulation study was used to assess the performance of the proposed parametric proportional hazard model. Two real-survival data problems in the healthcare are analyzed for illustration of the proposed model and for model comparison. Furthermore, the convergence diagnostic tests are presented and analyzed. Finally, our research found that the proposed parametric proportional hazard model performs well and could be beneficial in analyzing various types of survival data.
Non‐orthogonal multiple access (NOMA) is an attractive candidate for 6G networks to support ultra‐massive machine‐type communications (umMTC). Power domain NOMA (PD‐NOMA) is the simplest type of NOMA, which assigns a different power level to each user. Power allocation in PD‐NOMA can be classified into fixed/dynamic power allocation (FPA/DPA). FPA is simple, but DPA is more suitable for the mobile environment than FPA. However, finding optimum power per each user in DPA is extremely complex. Fortunately, many DPA strategic design methods were introduced in literature as simple suboptimal solutions of DPA. Therefore, DPA strategic design methods and FPA techniques are simple approaches to implement PD‐NOMA in 6G and beyond. In literature, no previous work had compared the performances of all DPA strategic design methods, nor FPA techniques, to ease the selection of a simple strategy for PD‐NOMA in 6G. Motivated by that, this work compares performances of all DPA strategic design methods as well as FPA techniques, in terms of sum‐rate capacity, fairness, and bit error rate (BER). Results showed that the best DPA strategic design method and the best FPA technique have comparable performance.
2‐(4‐Oxo‐4H‐benzo[d][1,3]oxazin‐2‐yl)acetonitrile (4) was synthesized through the reaction of anthranilic acid with ethyl cyanoacetate. The reactivity of the latter product toward chemical reagents was studied to produce coumarin, ylidene, thiophene, thieno[2,3‐b]pyridine, thiazole and pyrazole derivatives. The synthesized compounds were evaluated against three cancer cell lines namely HEPG2, HONE1 and MCF and normal cell line W138. The most active compounds 4, 6, 8 b, 12, 14, 16, 18 a, 18 b, 19, 21, 23 a, 23 b, 27 a, 27 b, 29 b, 31, 33 b, 36, 38 c and 39 b were further evaluated toward c‐Met kinase inhibitions. Overall results of inhibition toward the cancer cell lines showed that most of the tested compounds have high potent effect. The obtained results of c‐Met kinase inhibitions showed that all tested compounds gave high inhibitions. The results obtained through this work encourage us for future work using benzo[d]oxazine derivatives to produce target molecules as anticancer agents. Molecular docking of compounds 4, 6 and 16 were performed. Through this work a series of heterocyclic compounds were synthesized starting from 2‐(4‐oxo‐4H‐benzo[d][1,3]oxazin‐2‐yl)acetonitrile that was produced from the reaction of anthranilic acid with ethyl cyanoacetate in glacial acetic acid solution. The latter compound underwent different heterocyclization reactions to produce coumarin, ylidene, thiophene, thieno[2,3‐b]pyridine, thiazole and pyrazole derivatives. The synthesized compounds were screened against different cancer cell lines and the results obtained showed that some of these compounds considered as good anticancer agents. Interestingly, in such compounds the nature of substituent attached to both the heterocyclic ring and aryl moiety play a rule through their cytotoxicity.
This work proposes an appropriate method for cleaning pharmaceutical wastewater from hazardous compounds like cephalosporin and also conducts innovative full design criteria for commercial-scale applications associated with full economic evaluation. The sillenite Bi12TiO20 (BTO) was used as a catalyst in this approach, and it was chosen based on previous studies. First, the BTO catalyst was characterized and tested before proposing it as an alternative solution. The catalyst BTO has been characterized using various characterization techniques such as XRD, TEM, BET, XPS and DRS. This catalyst was found to be a nanoparticles sillenite type with a space group cubic structure type I 23 agglomerated in grains form with particle size around 3-15 μm and a surface area of 8.84 m 2 /g; its bandgap was found to be at ~2.9 eV. After characterization, the catalyst BTO was tested for the removal of three different antibiotics, which are Cefixime (CFX), Cefaclor (CFC), Cefuroxime (CFRM), and it has shown efficient photocatalytic activity with rates of 94%, 81%, and 69.71% within 210 min for CFX, CFC and CFRM; respectively. After that, a photocatalytic treatment system was proposed as a large scale of the previous process. An integrated economic assessment for treating 1 L/min antibiotic polluted effluents using this pilot scale design was presented to examine the system's commercial potential. The findings of batch experimental testing and pilot-scale designs proved the viability of employing BTO sillenite in a large-scale demonstration for pharmaceutical wastewater treatment as a sustainable and cost-effective photocatalytic system.
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37 members
Yasser Gamal
  • Civil Engineering Department
Omar Makram Kamel
  • Electrical Engineering & Computers Departments
Dr Mostafa Abd Elrazek
  • Civil Engineering Department
Tony Mohamed Sherif Saad
  • Civil Engineering Department
Shaimaa Mubarak
  • basic sciences (Mathematics)
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Al Minyā, Egypt
Website
http://mhiet.edu.eg/