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A Comprehensive Mathematical Programming Model for Minimizing Costs in A Multiple-Item Reverse Supply Chain with Sensitivity Analysis

Hoda Mahmoudi Hamed Fazlollahtabar

Management and Production Engineering Review | 2014 | No 3 | DOI: 10.2478/mper-2014-0026

Keywords Wydział IV Nauk Technicznych

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Abstract

Management and Production Engineering Review (MPER) is a peer-refereed, international, multidisciplinary journal covering a broad spectrum of topics in production engineering and management. Production engineering is a currently developing stream of science encompassing planning, design, implementation and management of production and logistic systems. Orientation towards human resources factor differentiates production engineering from other technical disciplines. The journal aims to advance the theoretical and applied knowledge of this rapidly evolving field, with a special focus on production management, organisation of production processes, management of production knowledge, computer integrated management of production flow, enterprise effectiveness, maintainability and sustainable manufacturing, productivity and organisation, forecasting, modelling and simulation, decision making systems, project management, innovation management and technology transfer, quality engineering and safety at work, supply chain optimization and logistics. Management and Production Engineering Review is published under the auspices of the Polish Academy of Sciences Committee on Production Engineering and Polish Association for Production Management. The main purpose of Management and Production Engineering Review is to publish the results of cutting-edge research advancing the concepts, theories and implementation of novel solutions in modern manufacturing. Papers presenting original research results related to production engineering and management education are also welcomed. We welcome original papers written in English. The Journal also publishes technical briefs, discussions of previously published papers, book reviews, and editorials. Letters to the Editor-in-Chief are highly encouraged.

Authors and Affiliations

Hoda Mahmoudi

Hamed Fazlollahtabar

Applying of water quality indices methods for assessment of 9-Nissan Water Treatment Plant

Hayder M. Abdul-Hameed

Journal of Water and Land Development | 2020 | No 47 | 25-29 | DOI: 10.24425/jwld.2020.135028

Keywords nitrate pH suspended solids water quality index water treatment plant

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Abstract

In this research different methods for measuring water quality indices were conducted to investigate the performance of the newly designed, constructed and operated 9-Nissan water treatment plant, Iraq. Data gathering and implementation took place throughout winter and summer. Water samples were taken periodically, according to the standard method, the re-search was carried out by collecting different random samples for eight months (Jun. 2015–Jan. 2016) and measuring (tur-bidity, total hardness, pH, total dissolved solids, suspended solids, Cl–, Mg2+, Fe2+,NO3–, NH3+) for each sample. Five dif-ferent approaches and methodologies of calculating the water index were applied. The results revealed that the Water Qual-ity Indices varied from 70.55 to 88.24, when applying Canadian Council of Ministers of the Environment Water Quality Index (CCMEWQI) and British Columbia water quality index (BCWQI) geometric weighted mean respectively. All the results, from the five approaches indicated good water quality, multiple regression analyses were conducted for turbidity, total hardness and suspended solids, they found that these parameters are strongly related to each other and to other pa-rameters.

Authors and Affiliations

Hayder M. Abdul-Hameed

Assessment of control strategies against Cydia pomonella (L.) in Morocco

Salma El Iraqui M’hamed Hmimina

Journal of Plant Protection Research | 2016 | vol. 56 | No 1 | DOI: 10.1515/jppr-2016-0012

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Authors and Affiliations

Salma El Iraqui

M’hamed Hmimina

Characterization of the climatic drought indices application to the Mellah catchment, North-East of Algeria

Lina Bendjema Kamila Baba-Hamed Abderrazak Bouanani

Journal of Water and Land Development | 2019 | No 43 | 28-40

Keywords drought drought break drought index humidity Mellah catchment

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Abstract

Drought is one of the important phenomena resulting from variability and climate change. It has negative effects on all economic, agricultural and social sectors. The objective of this study is to rapidly detect climate dryness situations on an annual scale at the Mellah catchment (Northeast Algeria) for periods ranging from 31 years through the calculation of: the standardized precipitation index (SPI), the standardized Streamflow index (SSFI), the standardized temperature index (STI). Calculations made it possible to locate periods of drought more precisely by their intensity, duration and frequency, and detect years of breaks using the tests of Pettitt, rang, Lee and Heghinian, Hubert and Buishand. The use of the statistical tests for the rainfall series analyzed show all breaks, the majority of which are in 1996/1997 and 2001/2002. For the tem-peratures the breaks are situated in 1980/1981.

Authors and Affiliations

Lina Bendjema

Kamila Baba-Hamed

Abderrazak Bouanani

Efficiency of some meteorological drought indices in different time scales, case study: wadi Louza basin (NW-Algeria)

Fayçal Djellouli Abderrazak Bouanani Kamila Baba-Hamed

Journal of Water and Land Development | 2016 | No 31

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Authors and Affiliations

Fayçal Djellouli

Abderrazak Bouanani

Kamila Baba-Hamed

Buckling of moderately thick annular plates subjected to torque

Hamed Bagheri Yaser Kiani Mohammad Reza Eslami

Archive of Mechanical Engineering | 2019 | vol. 66 | No 2 | 209-227 | DOI: 10.24425/ame.2019.128445

Keywords annular plate torque generalized differential quadrature asymmetric buckling trigonometric expansion

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Abstract

An attempt is made in the current research to obtain the fundamental buckling torque and the associated buckled shape of an annular plate. The plate is subjected to a torque on its outer edge. An isotropic homogeneous plate is considered. The governing equations of the plate in polar coordinates are established with the aid of the Mindlin plate theory. Deformations and stresses of the plate prior to buckling are determined using the axisymmetric flatness conditions. Small perturbations are then applied to construct the linearised stability equations which govern the onset of buckling. To solve the highly coupled equations in terms of displacements and rotations, periodic auxiliary functions and the generalised differential quadrature method are applied. The coupled linear algebraic equations are a set of homogeneous equations dealing with the buckling state of the plate subjected to a unique torque. Benchmark results are given in tabular presentations for combinations of free, simply-supported, and clamped types of boundary conditions. It is shown that the critical buckling torque and its associated shape highly depend upon the combination of boundary conditions, radius ratio, and the thickness ratio.

Bibliography

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[2] J. Tani and T. Nakamura. Dynamic stability of annular plates under pulsating torsion. Journal of Applied Mechanics, 47(3):595–600, 1980. doi: 10.1115/1.3153739.
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[4] D. Durban and Y. Stavsky. Elastic buckling of polar-orthotropic annular plates in shear. International Journal of Solids and Structures, 18(1):51–58, 1982. doi: 10.1016/0020-7683(82)90015-4.
[5] T. Irie, G. Yamada, and M. Tsujino. Vibration and stability of a variable thickness annular plate subjected to a torque. Journal of Sound and Vibration, 85(2):277–285, 1982. doi: 10.1016/0022-460X(82)90522-3.
[6] T. Irie, G. Yamada, and M. Tsujino. Buckling loads of annular plates subjected to a torque. Journal of Sound and Vibration, 86(1):145–146, 1983. doi: 10.1016/0022-460X(83)90951-3.
[7] J. Zajączkowski. Stability of transverse vibration of a circular plate subjected to a periodically varying torque. Journal of Sound and Vibration, 89(2):273–286, 1983. doi: 10.1016/0022-460X(83)90394-2.
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[11] Chang-Jun Cheng and Xiao-an Lui. Buckling and post-buckling of annular plates in shearing, Part I: Buckling. Computer Methods in Applied Mechanics and Engineering, 92(2):157–172, 1991. doi: 10.1016/0045-7825(91)90237-Z.
[12] Chang-Jun Cheng and Xiao-an Lui. Buckling and post-buckling of annular plates in shearing, Part II: Post-buckling. Computer Methods in Applied Mechanics and Engineering, 92(2):173–191, 1991. doi: 10.1016/0045-7825(91)90238-2.
[13] P. Singhatanadgid and V. Ungbhakorn. Scaling laws for buckling of polar orthotropic annular plates subjected to compressive and torsional loading. Thin-Walled Structures, 43(7):1115–1129, 2005. doi: 10.1016/j.tws.2004.11.004.
[14] T.X. Wu. Analytical study on torsional vibration of circular and annular plate. Journal of Mechanical Engineering Science, 220(4):393–401, 2006. doi: 10.1243/09544062JMES167.
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[16] S.E. Ghiasian, Y. Kiani, M. Sadighi, and M.R. Eslami. Thermal buckling of shear deformable temperature dependent circular annular FGM plates. International Journal of Mechanical Sciences, 81:137–148, 2014. doi: 10.1016/j.ijmecsci.2014.02.007.
[17] H. Bagheri, Y. Kiani, and M.R. Eslami. Asymmetric thermal buckling of temperature dependent annular FGM plates on a partial elastic foundation. Computers & Mathematics with Applications, 75(5):1566–1581, 2018. doi: 10.1016/j.camwa.2017.11.021.
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[19] J.N. Reddy. Mechanics of Laminated Composite Plates and Shells, Theory and Application. CRC Press, 2nd Edition, 2003.
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Authors and Affiliations

Hamed Bagheri

1

Yaser Kiani

2

Mohammad Reza Eslami

1

Mechanical Engineering Department, Amirkabir University of Technology, Tehran, Iran.
Faculty of Engineering, Shahrekord University, Shahrekord, Iran.

The Effect of Green Maintenance on Environmental Performance Applied Research in the General Company for Oil Products

Amer Abdul Latif KADHUM Huda Adeeb HAMEED

Management and Production Engineering Review | 2023 | vol. 14 | No 3 | DOI: 10.24425/mper.2023.147192

Keywords Green maintenance environmental performance Operational and management performanceindicators

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Abstract

The research aims to determine the effect of green maintenance “energy efficiency, health and safety risks, and environmental compatibility“ on environmental performance “environmental condition, operational performance, and management performance“ as analytical research in oil products distribution company by distributing a questionnaire distributed to 46 people. The research problem lies in the weak use of traditional maintenance technology, which negatively affects the environment. The research found that the research company’s reliance on green maintenance is weak in adopting new mechanisms and technologies to enhance environmental performance and the weakness of the efforts exerted by management in the field of environmental performance and the failure to involve its staff in training programs to create a culture of preserving the environment within the culture of the organization. The research recommends the need to use machines with low energy consumption and reduce the volume of pollution.

Authors and Affiliations

Amer Abdul Latif KADHUM

Huda Adeeb HAMEED

1

Rusafa Institute of Administration, Department of Materials Management Technologies, Iraq

An adaptive control scheme for hyperbolic partial differential equation system (drilling system) with unknown coefficient

Hamed Shirinabadi Farahani Heidar Ali Talebi Mohammad Baghermenhaj

Archives of Control Sciences | 2017 | No 1 | DOI: 10.1515/acsc-2017-0004

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Abstract

Abstract The adaptive boundary stabilization is investigated for a class of systems described by second-order hyperbolic PDEs with unknown coefficient. The proposed control scheme only utilizes measurement on top boundary and assume anti-damping dynamics on the opposite boundary which is the main feature of our work. To cope with the lack of full state measurements, we introduce Riemann variables which allow us reformulate the second-order in time hyperbolic PDE as a system with linear input-delay dynamics. Then, the infinite-dimensional time-delay tools are employed to design the controller. Simulation results which applied on mathematical model of drilling system are given to demonstrate the effectiveness of the proposed control approach.

Authors and Affiliations

Hamed Shirinabadi Farahani

Heidar Ali Talebi

Mohammad Baghermenhaj

MgFe-doubled layers hydroxide intercalated with low cost local adsorbent using for removal of lead from aqueous solution

Hayder M. Abdul-Hameed Maad F. Al Juboury

Journal of Water and Land Development | 2020 | No 45 | 10-18 | DOI: 10.24425/jwld.2020.133041

Keywords adsorption agriculture waste composite adsorbent heavy metals leaf date palm

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Abstract

A new composite adsorbent was prepared by modifying low cost local adsorbent (LCL) using MgFe layered double hydroxide (LDH). This low cost local adsorbent was also prepared from the activation of date palm leaf derived from agricultural waste. In comparison to the low LCL, the adsorption capacity of the new composite adsorbent (LCL/MgFe-LDH) was improved. This was measured in terms of its ability to remove lead from wastewater. The Scanning electron microscope (SEM), Energy dispersive spectroscopy (EDS), Fourier-transform infrared spectroscopy (FTIR) and the specific surface area by the (Brunauer, Emmett and Teller) theory (BET) tests were conducted for the characterisation of LCL and LCL/MgFe-LDH. The behaviour of the lead adsorption processes by using LCL/MgFe-LDH as adsorbent was investigated in batch experiments by examining different values of solution pH, contact time, adsorbent dose and initial Pb2+ concentration. High removal efficiency was exhibited by LCL/MgFe-LDH, a value almost double that of LCL. This was attributed to the increase in surface area of LCL/MgFe-LDH (79.7 m2·g–1) in contrast to the surface area of LCL (24.5 m2·g–1). The Freundlich equations and pseudo-second-order kinetics model were appropriate for the provision of adsorption equilibrium data for Pb2+ on adsorbents. These results reveal the great potential of the new composite adsorbent (LCL/MgFe-LDH) if applied to the absorption of heavy metal ions.

Authors and Affiliations

Hayder M. Abdul-Hameed

Maad F. Al Juboury

PCR-based detection of Helicobacter pylori and non-Helicobacter pylori species among humans and animals with potential for zoonotic infections

A.I. Youssef A. Afifi S. Abbadi A. Hamed M. Enany

Polish Journal of Veterinary Sciences | 2021 | vol. 24 | No 3 | 445-450 | DOI: 10.24425/pjvs.2021.138737

Keywords Helicobacter spp. zoonotic infections detection identification

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Abstract

Helicobacter species have been reported in animals, some of which are of zoonotic importance. This study aimed to detect Helicobacter species among human and animal samples using conventional PCR assays and to identify their zoonotic potentials. Helicobacter species was identified in human and animal samples by genus-specific PCR assays and phylogenetic analysis of partial sequencing of the 16S ribosomal RNA gene. The results revealed that Helicobacter species DNA was detected in 13 of 29 (44.83%) of the human samples. H. pylori was identified in 2 (15.38%), and H. bovis was detected in 4 (30.77%), whereas 7 (53.85%) were unidentified. H. bovis and H. heilmannii were prevalent among the animal samples. Phylogenetic analysis revealed bootstrapping of sequences with H. cinaedi in camel, H. rappini in sheep and humans, and Wollinella succinogenes in humans. In conclusion, the occurrence of non-H. pylori infections among human and animal samples suggested zoonotic potentials.

Bibliography

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Buczolits S, Hirt R, Rosengarten R, Busse HJ (2003) PCR-based genetic evidence for occurrence of Helicobacter pylori and novel Helico-bacter species in the canine gastric mucosa. Vet Microbiol 95: 259-270.
Chong SK, Lou Q, Fitzgerald JF, Lee CH (1996) Evaluation of 16S rRNA gene PCR with primers Hp1 and Hp2 for detection of Helicobacter pylori. J Clin Microbiol 34: 2728-2730.
De Groote D, Van Doorn LJ, Van den Bulck K, Vandamme P, Vieth M, Stolte M, Debongnie JC, Burette A, Haesebrouck F, Ducatelle R (2005) Detection of non-pylori Helicobacter species in “Helicobacter heilmannii”-infected humans. Helicobacter 10: 398-406.
Fox JG (2002) The non-H pylori helicobacters: their expan- ding role in gastrointestinal and systemic diseases. Gut 50: 273-283.
Germani Y, Dauga C, Duval P, Huerre M, Levy M, Pialoux G, Sansonetti P, Grimont PA (1997) Strategy for the detection of Helicobacter species by amplification of 16S rRNA genes and identification of H. felis in a human gastric biopsy. Res Microbiol 148: 315-326.
Goodwin CS, Armstrong JA, Chilvers T, Peter M, Colins MD, Sly L, Mcconnell W, Harper WES (1989) Transfer of Campylobacter pylori and Campylobacter mustelae to Helicobacter gen. nov. as Helicobacter pylori comb. nov. and Helicobacter mustelae comb. nov. Respectively. Int J Syst Bacteriol 39: 397-405.
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Van den Bulck K, Decostere A, Baele M, Driessen A, Debongnie JC, Burette A, Stolte M, Ducatelle R, Haesebrouck F (2005) Identification of non-Helicobacter pylori spiral organisms in gastric samples from humans, dogs, and cats. J Clin Microbiol 43: 2256-2260.
Wolin MJ, Wolin EA, Jacobs NJ (1961) Cytochrome-producing anaerobic Vibrio succinogenes, sp. n. J Bacteriol 81: 911-917.

Authors and Affiliations

A.I. Youssef

1

A. Afifi

2

S. Abbadi

3

A. Hamed

4

M. Enany

2

Animal Hygiene and Zoonoses, Faculty of Veterinary Medicine, Suez Canal University, 41522, 4.5 Km Ring Road, Ismailia, Egypt
Microbiology and Immunology Department, Faculty of Veterinary Medicine, Suez Canal University, Egypt
Microbiology and Immunology Department, Faculty of Medicine, Suez University, 43512, Alsalam City, Suez, Egypt
Biotechnology Department, Animal Health Research Institute, P.O. Box 264, Dokki, Giza 12618, Egypt

Application of the central composite design to optimization of petroleum hydrocarbons removal from oil ﬁeld water using advanced oxidation process

Mahdi Farzadkia Mahdi Ghorbanian Hamed Biglari Mitra Gholami Ehsan Abouee Mehrizi

Archives of Environmental Protection | 2018 | No 4 | DOI: 10.24425/aep.2018.122299

Keywords Advanced oxidation processes optimizing total oil hydrocarbons central composite design

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Authors and Affiliations

Mahdi Farzadkia

Mahdi Ghorbanian

Hamed Biglari

Mitra Gholami

Ehsan Abouee Mehrizi

Inundation maps for extreme flood events: Case study of Sidi Bel Abbes city, Algeria

M'hamed Atallah Abdelkrim Hazzab Abdelali Seddini Abdellah Ghenaim Khaled Korichi

Journal of Water and Land Development | 2018 | No 37

Keywords flood inundation maps Runge–Kutta discontinuous Galerkin Saint-Venant equations Wadi Mekerra

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Authors and Affiliations

M'hamed Atallah

Abdelkrim Hazzab

Abdelali Seddini

Abdellah Ghenaim

Khaled Korichi

A study of the climate and human impact on the future survival of the Al-Sannya marsh in Iraq

Amal Jabbar Hatem Ali Adnan N. Al-Jasim Hameed Majeed Abduljabbar

Journal of Water and Land Development | 2021 | No 51 | 168-173 | DOI: 10.24425/jwld.2021.139027

Keywords climate change human impact Landsat 5 Landsat 8 maximum likelihood classification south of Iraq

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Abstract

The marshes are the most abundant water sources and ecological rich communities. They have a significant impact on the ecological and economic well-being of the communities surrounding them. However, climatic changes directly impact these bodies of water, especially those marshes which depend on rainwater and flooding for their survival. The Al-Sannya marsh is used as the example of marshes in Southern Iraq for this study between 1987–2017. The research takes place throughout the winter season due to the revival of marshes in southern Iraq at this time of year. The years 1987, 1990, 1995, 2000, 2007, 2014, 2017 are the focus of this study. Satellite imagery from the Landsat 5 (TM) and Landsat 8 (OLI) and the meteorological parameters affecting the marsh were acquired from NASA. The calculation of the areas of water bodies after classification using satellite imagery is done using the maximum likelihood method and comparing it with meteorological parameters. These results showed that these marshes are facing extinction due to the general change of climate and the interference of humans in utilising the drylands of the marsh for agricultural purposes. The vegetation area can be seen to have decreased from 51.15 km2 in 2000 to 8.77 km2 in 2017.

Authors and Affiliations

Amal Jabbar Hatem

1

Ali Adnan N. Al-Jasim

1

e-mail:

ORCID:

Hameed Majeed Abduljabbar

1

University of Baghdad, College of Education for Pure Science (Ibn-Al-Haitham), Department of Physics, Baghdad, Iraq

Evaluation of wet cooling tower replacement by Heller cooling tower in a power plant

Mohamad Hasan Malekmohamadi Hossein Ahmadikia Siavash Golmohamadi Hamed Khodadadi

Archive of Mechanical Engineering | 2023 | vol. 70 | No 1 | 129-149 | DOI: 10.24425/ame.2022.144076

Keywords Heller cooling tower wet cooling tower condenser power plant

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Abstract

Water resources are the main component of natural systems affected by climate change in the Middle East. Due to a lack of water, steam power plants that use wet cooling towers have inevitably reduced their output power. This article investigates the replacement of wet cooling towers in Isfahan Thermal Power Plant (ITPP) with Heller natural dry draft cooling towers. The thermodynamic cycle of ITPP is simulated and the effect of condenser temperature on efficiency and output power of ITPP is evaluated. For various reasons, the possibility of installing the Heller tower without increasing in condenser temperature and without changing the existing components of the power plant was rejected. The results show an increase in the condenser temperature by removing the last row blades of the low-pressure turbine. However, by replacing the cooling tower without removing the blades of the last row of the turbine, the output power and efficiency of the power plant have decreased about 12.4 MW and 1.68 percent, respectively.

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Authors and Affiliations

Mohamad Hasan Malekmohamadi

1 2

Hossein Ahmadikia

1

e-mail:

ORCID:

Siavash Golmohamadi

2

Hamed Khodadadi

3

University of Isfahan, Isfahan, Iran
Isfahan Thermal Power Plant, Isfahan, Iran
Department of Electrical Engineering, Khomeinishahr Branch, Islamic Azad University, Isfahan, Iran

Spatial and temporal evaluation of global rainfall products in a data-scarce region: The Dez Basin, Iran

Mostafa Khoshchehreh Mehdi Ghomeshi Ali Shahbazi Hossein Bolboli Hamed Saberi Ali Gorjizade

Journal of Water and Land Development | 2021 | No 48 | 148-161 | DOI: 10.24425/jwld.2021.136158

Keywords CMORPH ERA5 ERA-Interim PERSIANN-CCS precipitation datasets reanalysis data satellite-based precipitation

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Abstract

The limitation in approachability to rainfall data sources with an appropriate spatial-temporal distribution is a signifi-cant challenge in different parts of the world. The development of general circulation models and mathematical algorithms has led to the generation of various rainfall products as new sources with the potential to overcome the shortage in data-scarce basins. In this study, the performance of the PERSIANN-CCS and CMORPH satellite-based rainfall product, as well as the ERA5 and ERA-Interim reanalysis, was evaluated based on detection skill and quantitative metrics in a daily, month-ly and seasonal time scales in the Dez basin located in the southwest of Iran. The basin has a wide topographic variation and scattered rain gauge stations. Overall results denote that the ERA5 dataset has the best performance in all statistic veri-fication than other rainfall products. Based on the daily evaluation of all rainfall products, the false alarm rate (FAR) is higher than 0.5, so none of the datasets could capture the temporal variability of rainfall occurrence. This study has covered the western parts of the Zagros steep slopes in which the topographic conditions have a significant effect on the activity of rainfall systems. On a monthly scale, the mean value of the correlation coefficient (CC) for ERA5, ERA-Interim, PER-SIANN-CCS, and CMORPH was equal to 0.86, 0.85, 0.51, 0.39, respectively. The results of seasonal evaluation suggested that all datasets have better rainfall estimation in autumn and winter, and the capability of all datasets dramatically de-creased in the spring. The current paper argues that the ERA5 reanalysis typically outperforms ERA-Interim and can be considered as a reliable rainfall source in the future hydrological investigation in the southwest of Iran.

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Authors and Affiliations

Mostafa Khoshchehreh

1

e-mail:

ORCID:

Mehdi Ghomeshi

1

Ali Shahbazi

1

Hossein Bolboli

1

Hamed Saberi

2

Ali Gorjizade

1

Shahid Chamran University of Ahvaz, Faculty of Water Science Engineering, Department of Water and Hydraulic Structures, Golestan Blvd., Ahvaz, 6135783151, Iran
Khorramshahr University of Marine Science and Technology, Faculty of Engineering, Khorramshahr, Iran

Surface Effect on Electronic, Magnetic and Optical Properties of PtCoBi Half-Heusler: A DFT Study

Hamed Rezazadeh Mohamadreza Hantehzadeh Arash Boochani

Archives of Metallurgy and Materials | 2022 | vol. 67 | No 1 | 155-166 | DOI: 10.24425/amm.2022.137484

Keywords PtCoBi [001] film DFT Electronic property Optical property

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Abstract

The electronic, magnetic, and optical properties of PtCoBi half-Heusler compound [001] surfaces and its bulk state have been investigated in the framework of density functional theory using GGA approximation. The half-metallic behaviors of CoBi-term, CoPt-term and PtBi-term decrease with respect to its bulk state. The spin polarization at the Fermi level is 73.2% for the bulk state, and it is –64.4% and –64.1% for the CoBi-term and PtBi-term, respectively while less polarization has been observed for the CoPt-term. All terminations have given almost similar optical responses to light. Plasmon oscillations for the terminations occur in the range of 12.5 to 14.5 eV (21 to 22 eV) along xx (zz), and it occurs at 23 eV for the bulk state. The refractive index for the bulk and all three terminations is very high in the infrared and visible areas, meaning a very strong metallic trend in these compounds. The phenomenon of super-luminance occurs for the incident light with energy exceeding 5.5 eV for all three terminations, and it occurs in the range of 10 eV for the bulk mode. These terminations show transparent behavior after the energy of 10 eV.

Authors and Affiliations

Hamed Rezazadeh

1

e-mail:

ORCID:

Mohamadreza Hantehzadeh

1

e-mail:

ORCID:

Arash Boochani

2

e-mail:

ORCID:

Islamic Azad University, Department of Physics, Science and Research Branch, Tehran, Iran
Islamic Azad University, Department of Physics, Kermanshah Branch, Kermanshah, Iran

Hybrid PAPR reduction schemes for different OFDM-based VLC systems

Mohamed Y. El-Ganiny Ashraf A. M. Khalaf Aziza I. Hussein Hesham F. A. Hamed

Opto-Electronics Review | 2022 | 30 | 3 | e141951 | DOI: 10.24425/opelre.2022.141951

Keywords visible light communication peak-to-average power ratio bit error rate

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Abstract

Orthogonal frequency division multiplexing has been widely used in many radio frequency wireless communication standards as a preferable multicarrier modulation scheme. The modulated signals of a conventional orthogonal frequency division multiplexing system are complex and bipolar. In intensity-modulated direct detection optical wireless communications, transmitted signals should be real and unipolar due to non-coherent emissions of an optical light emitting diode. In this paper, different hybrid optical systems have been proposed to satisfy real and unipolar signals. Peak-to-average power ratio is one of the biggest challenges for orthogonal frequency division multiplexing-based visible light communications. They are based on a combination of non-linear companding techniques with spreading or precoding techniques. Simulation evaluation is performed under direct current-biased optical orthogonal frequency division multiplexing, asymmetrically clipped optical orthogonal frequency division multiplexing, and Flip-orthogonal frequency division multiplexing systems in terms of peak-to-average power ratio, bit error rate, and spectral efficiency. The proposed schemes are investigated to determine a scheme with a low peak-to-average power ratio and an acceptable bit error rate. MATLABTM software has been successfully used to show the validity of the proposed schemes.

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Authors and Affiliations

Mohamed Y. El-Ganiny

1

Ashraf A. M. Khalaf

2

e-mail:

ORCID:

Aziza I. Hussein

3

e-mail:

ORCID:

Hesham F. A. Hamed

4

Department of Electrical Engineering, Higher Technological Institute, 10th of Ramadan City, Sharqia, Egypt
Department of Electrical Engineering, Faculty of Engineering, Minia University, Minia 61519, Egypt
Electrical and Computer Engineering Department, Effat University, Jeddah, Kingdom of Saudi Arabia
Department of Telecommunications Engineering, Egyptian Russian University, Badr City, Egypt

A proposed preamble channel estimation scheme for flip FBMC-based indoor VLC systems

Mohamed Y. El-Ganiny Ashraf A. M. Khalaf Aziza I. Hussein Hesham F. A. Hamed

Opto-Electronics Review | 2022 | 30 | 1 | e140859 | DOI: 10.24425/opelre.2022.140859

Keywords channel estimation filter bank multicarrier IEEE 802.15.7 standard interference approximation method visible light communication

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Abstract

Filter bank multicarrier waveform is investigated as a potential waveform for visible light communication broadcasting systems. Imaginary inter-carrier and/or inter-symbol interference are causing substantial performance degradation in the filter bank multicarrier system. Direct current-biased optical filter bank multicarrier modulation overcomes all the problems of direct current-biased optical-orthogonal frequency division multiplexing modulation approaches in terms of speed and bandwidth. However, it also wastes a lot of energy while transforming a true bipolar signal into a positive unipolar signal by adding direct current-bias. In this paper, a flip-filter bank multicarrier-based visible light communication system was introduced to overcome this problem. In this system, a bipolar signal is converted to a unipolar signal by isolating the positive and negative parts, turning them to positive and then delivering the signal. Also, a new channel estimation scheme for a flip-filter bank multicarrier system is proposed which improves the channel estimation performance compared to that of each of the conventional schemes. The proposed system performance is measured in terms of bit error rate, normalized mean squared error, and constellation diagram. The superiority of the proposed scheme over other conventional structures has been successfully verified by MATLAB 2020b simulation experiments results. These results are evaluated under indoor visible light communication standard.

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Authors and Affiliations

Mohamed Y. El-Ganiny

1

Ashraf A. M. Khalaf

2

e-mail:

ORCID:

Aziza I. Hussein

3

e-mail:

ORCID:

Hesham F. A. Hamed

4

Department of Electrical Engineering, Higher Technological Institute, 10th of Ramadan City, Sharqia, Egypt
Department of Electrical Engineering, Faculty of Engineering, Minia University, Minia, Egypt
Electrical and Computer Engineering Department, Effat University, Jeddah, Kingdom of Saudi Arabia
Department of Telecommunications Engineering, Egyptian Russian University, Badr City, Egypt

A comparative assessment of meteorological drought in the Tafna basin, Northwestern Algeria

Hanane Bougara Kamila Baba Hamed Christian Borgemeister Bernhard Tischbein Navneet Kumar

Journal of Water and Land Development | 2021 | No 51 | 78-93 | DOI: 10.24425/jwld.2021.139018

Keywords drought meteorological drought indices Tafna basin trend analysis

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Abstract

The drought ranked first in terms the natural hazard characteristics and impacts followed by tropical cyclones, regional floods, earthquakes, and volcanoes. Drought monitoring is an important aspect of drought risk management and the assessment of drought is usually done through using various drought indices. The western region in Algeria is the most affected by the drought since the middle of the 70s.The current research focuses on the analysis and comparison of four meteorological drought indices (standardized precipitation index – SPI, percent of normal index – PN, decile index – DI, and rainfall anomaly index – RAI) in the Tafna basin for different time scales (annual, seasonal, and monthly) during 1979–2011. The results showed that the SPI and DI have similar frequencies for dry and wet categories. The RAI and PN were able to detect more drought categories. Meanwhile, all indices have strong positive correlations between each other, especially with Spearman correlation tests (0.99; 1.0), the meteorological drought indices almost showed consistent and similar results in the study area. It was determined in 1982 as the driest year and 2008 as the wettest year in the period of the study. The analysis of the trend was based on the test of Mann– Kendall (MK), a positive trend of the indices were detected on a monthly scale, this increasing of indices trend represent the increasing of the wet categories which explains the increasing trend of the rainfall in the last 2000s. These results overview of the understanding of drought trends in the region is crucial for making strategies and assist in decision making for water resources management and reducing vulnerability to drought.

Authors and Affiliations

Hanane Bougara

1 2

e-mail:

ORCID:

Kamila Baba Hamed

1

Christian Borgemeister

3

e-mail:

ORCID:

Bernhard Tischbein

3

e-mail:

ORCID:

Navneet Kumar

3

e-mail:

ORCID:

University of Abou Bekr Belkaid, Faculty of Technology, Tlemcen BP 230 - 13000, Chetouane Tlemcen, Algeria
Pan African University Institute of Water and Energy Sciences (PAUWES), Tlemcen, Algeria
University of Bonn, Center for Development Research (ZEF), Bonn, Germany

1

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