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Articles 191581 - 191610 of 5154166

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Microfacies, Biostratigraphy, Depositional Environment, Seismic Refraction And Correlation Of Coralline Limestones Of The Barzaman Formation (Oligocene-Pliocene? Al-Khod, Muscat Area, Sultanate Of Oman), Frank Mattern Journal, Abdul Razak Al-Sayigh, Mohammed Farfour, Andreas Scharf, Shaima Al-Amri, Juhaina Al-Omairi Apr 2025

Microfacies, Biostratigraphy, Depositional Environment, Seismic Refraction And Correlation Of Coralline Limestones Of The Barzaman Formation (Oligocene-Pliocene? Al-Khod, Muscat Area, Sultanate Of Oman), Frank Mattern Journal, Abdul Razak Al-Sayigh, Mohammed Farfour, Andreas Scharf, Shaima Al-Amri, Juhaina Al-Omairi

Sultan Qaboos University Journal For Science

The “Carbonates” unit of the Oligocene-Pliocene Barzaman Formation, north of the Oman Mountains at Sultan Qaboos Campus, is at least 10 m thick. It consists of three coralline limestone beds in (1) bedded facies (base; eastern outcrop), (2) very thick-bedded debris facies (middle; western and eastern outcrops) and (3) bedded facies (top; western and eastern outcrops). These three beds can be correlated between two outcrops over a distance of 160 m based on facies, stratigraphic positions and thickness as well as on a seismic refraction survey. The most common bioclasts are poritid corals, red algae and benthic foraminifers. Dasycladacean algae …

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Dicyclic Groups And Frobenius Manifolds, Yassir Dinar, Zainab Al-Maamari Apr 2025

Dicyclic Groups And Frobenius Manifolds, Yassir Dinar, Zainab Al-Maamari

Sultan Qaboos University Journal For Science

The orbits space of an irreducible representation of a finite group is a variety whose coordinate ring is finitely generated by homogeneous invariant polynomials. Boris Dubrovin showed that the orbits spaces of the reflection groups acquire the structure of polynomial Frobenius manifolds. Dubrovin’s method to construct examples of Frobenius manifolds on orbits spaces was carried for other linear representations of discrete groups which have in common that the coordinate rings of the orbits spaces are polynomial rings. In this article, we show that the orbits space of an irreducible representation of a dicyclic group acquires two structures of Frobenius manifolds. …

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Doubly Periodic Functions And Floquet Theorem, Nafya H. Mohammed Journal, Nazaneen Q.M. Saeed Apr 2025

Doubly Periodic Functions And Floquet Theorem, Nafya H. Mohammed Journal, Nazaneen Q.M. Saeed

Sultan Qaboos University Journal For Science

In complex analysis, an elliptic function is a meromorphic function that is periodic in two directions. Just as a periodic function of a real variable is defined by its values on an interval, an elliptic function is determined by its values on a fundamental parallelogram, which then repeat in a lattice. Such a doubly periodic function cannot be holomorphic, as it would then be a bounded entire function, and by Liouville's theorem every such function must be constant. Historically, elliptic functions were first discovered by Niels Henrik Abel as inverse functions of elliptic integrals, and their theory was improved by …

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Effects Of Thermal Stratification And Anisotropic Porous Material In A Symmetrically Heated Vertical Channel, Basant K. Jha, Muhammad K. Musa, Abiodun O. Ajibade Apr 2025

Effects Of Thermal Stratification And Anisotropic Porous Material In A Symmetrically Heated Vertical Channel, Basant K. Jha, Muhammad K. Musa, Abiodun O. Ajibade

Sultan Qaboos University Journal For Science

The coexistence in nature of thermally stratified fluids and directionally inclined porous structures abound in geophysical fluid flow. Despite their important applications especially in underground flow, their combined effects on natural convection have not been intensively investigated. This article aims to investigate a fully developed time dependent natural convection of viscous incompressible stably stratified fluid in the presence of anisotropic porous material. The semi analytical solutions of the governing equations for the temperature and velocity fields are obtained using the Laplace Transform Technique, Riemann Sum Approximation and D’Alembert Methods. The choice of the D’Alembert Method is to provide a systematic …

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Magneto-Optical Kerr Microscopy For Nano-Structures With Perpendicular Magnetic Anisotropy, Suleiman Al-Risi, Rachid Sbiaa, Hanan Mohammed, Jurgen Kosel Apr 2025

Magneto-Optical Kerr Microscopy For Nano-Structures With Perpendicular Magnetic Anisotropy, Suleiman Al-Risi, Rachid Sbiaa, Hanan Mohammed, Jurgen Kosel

Sultan Qaboos University Journal For Science

Magneto-optical Kerr effect (MOKE) microscopy is a powerful imaging technique that can be employed to study the magnetization reversal of thin films and nanoscale structures. In this work, we describe the MOKE microscopy which is used to observe nanomagnetic domain structures of Co/Pt multilayers (MLs) and plot hysteresis loops. We were able to image sub-micrometer size magnetic domains and trace their evolution in a ms time scale with a lateral spatial resolution down to 300 nm. The magnetization reversal for Co/Pt MLs is described by the expansion of the domains in all directions as dendritic domain wall propagation. For a …

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A Statistical Analysis On Forecasting Prices Of Some Important Food Commodities In Bangladesh, Mohammad Abdullah Al-Mamun, Sheikh Mohammad Sayem, Khondaker Mohammad Mostafizur Rahman, Mohammad Zakir Hossain Apr 2025

A Statistical Analysis On Forecasting Prices Of Some Important Food Commodities In Bangladesh, Mohammad Abdullah Al-Mamun, Sheikh Mohammad Sayem, Khondaker Mohammad Mostafizur Rahman, Mohammad Zakir Hossain

Sultan Qaboos University Journal For Science

This paper investigates the best possible forecasting price models for three important agricultural products in Bangladesh namely potato, onion and garlic using time-series and secondary data from January 2000 to December 2014. The main objective of this paper is to find out the appropriate time series models using some of the latest selection criteria that could describe the best price patterns of the above mentioned three crops. To forecast the prices of the crops, the ARIMA models were used, based on model selection criteria and error statistics among the competing models. The overall findings of the study indicate that the …

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Effect Of Smokeless Tobacco Product, Afzal, On The Reproductive Hormones And Gonadal Pathology Of Wistar Rats, Nawal Al-Mukhaini, Taher Ba Omar, Elsadig Eltayeb, Aisha Al Khayat Al-Shehi, Jamila Al-Belushi, Nafila Al-Riyami, Romulo Cipriano, Kawther Al-Adawi Apr 2025

Effect Of Smokeless Tobacco Product, Afzal, On The Reproductive Hormones And Gonadal Pathology Of Wistar Rats, Nawal Al-Mukhaini, Taher Ba Omar, Elsadig Eltayeb, Aisha Al Khayat Al-Shehi, Jamila Al-Belushi, Nafila Al-Riyami, Romulo Cipriano, Kawther Al-Adawi

Sultan Qaboos University Journal For Science

Afzal is a common smokeless tobacco product (STP) in Oman, and it is believed to contain toxins that may affect the reproductive hormones and hence reproductive function. This study assessed the effect of Afzal on the gonads of Wistar rats. In order to assess gonad toxicity induced by this STP, an aqueous extract of Afzal was added to drinking water to be administrated orally to Wistar albino rats (n = 72) classified as young (4 weeks old) and adult (20 weeks old) of both genders weighing between 60-80 g and 150-240 g respectively for 8 weeks. The rats were divided …

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Nutrient Content, In Vitro Ruminal Fermentation Characteristics And Antimethanogenic Potential Of Three Algerian Asteraceae Species, Serine Amokrane, Rabah Arhab, Serina Calabro, Raffaella Tudisco, Federico Infascelli, Moufida Aggoun Apr 2025

Nutrient Content, In Vitro Ruminal Fermentation Characteristics And Antimethanogenic Potential Of Three Algerian Asteraceae Species, Serine Amokrane, Rabah Arhab, Serina Calabro, Raffaella Tudisco, Federico Infascelli, Moufida Aggoun

Sultan Qaboos University Journal For Science

The in vitro rumen fermentation parameters and the antimethanogenic potential of three Asteraceae species: Chamaemelum nobile, Centaurea pulata and Chrysanthemum segetum were determined. Serum bottles containing 200 mg of each plant and 30 ml of the culture medium (artificial saliva plus rumen juice) were incubated for 24 h. After incubation, pH, volatile fatty acid (VFA), ammonia (NH3) and methane (CH4) productions were recorded. Methanogens and protozoa were quantified using a Real Time PCR technique (qPCR). Cumulative gas productions, in vitro organic matter digestibility and VFA were not significantly affected by the added species when compared to the control (P > 0.05). …

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Distribution Of Nutrient Salts And Chlorophyll-A In Surface Water Along The Gulf Of Aden And Arabian Sea Coast, Yemen, Ibrahim A. Al-Akhaly, Nabil A. Al-Shwafi, Shehab A. Al-Kabsh Apr 2025

Distribution Of Nutrient Salts And Chlorophyll-A In Surface Water Along The Gulf Of Aden And Arabian Sea Coast, Yemen, Ibrahim A. Al-Akhaly, Nabil A. Al-Shwafi, Shehab A. Al-Kabsh

Sultan Qaboos University Journal For Science

The distribution of inorganic nutrient salts (ammonium, nitrite, nitrate, phosphate and silicate) and phytoplankton chlorophyll-a (Chl-a) were investigated in the Gulf of Aden and along the Arabian Sea coast, Yemen. Seventy two surface water samples were collected during cruises in August 2014 and January 2015. The sampled area extends from As Suqayyah in the west of the Gulf of Aden to Hawf in the east. The study showed that the average values of nutrient salts (μg/l) in waters collected in August 2014 and January 2015 were 0.83 and 0.60, 10.98 and 10.03, 16.41 and 14.73, 10.36 and 8.76, and 29.72 …

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Dimension Reduction And Relaxation Of Johnson’S Method For Two Machines Flow Shop Scheduling Problem, Mekonnen Redi, Mohammad Ikram Apr 2025

Dimension Reduction And Relaxation Of Johnson’S Method For Two Machines Flow Shop Scheduling Problem, Mekonnen Redi, Mohammad Ikram

Sultan Qaboos University Journal For Science

The traditional dimensionality reduction methods can be generally classified into Feature Extraction (FE) and Feature Selection (FS) approaches. The classical FE algorithms are generally classified into linear and nonlinear algorithms. Linear algorithms such as Principal Component Analysis (PCA) aim to project high dimensional data to a lower-dimensional space by linear transformations according to certain criteria. The central idea of PCA is to reduce the dimensionality of the data set consisting of a large number of variables. In this paper, PCA was used to reduce the dimension of flow shop scheduling problems. This mathematical procedure transforms a number of (possibly) correlated …

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Magnetization Dynamics In A Perpendicular Anisotropy Free Layer Under A Spin Torque Effect With Crossed Polarization, Nafeesa Rahman, Rachid Sbiaa Apr 2025

Magnetization Dynamics In A Perpendicular Anisotropy Free Layer Under A Spin Torque Effect With Crossed Polarization, Nafeesa Rahman, Rachid Sbiaa

Sultan Qaboos University Journal For Science

The transfer of spin angular momentum from a spin polarized current provides an efficient way of reversing the magnetization direction of the free layer of the magnetic tunnel junction (MTJ), and while faster reversal will reduce the switching energy, this in turn will lead to low power consumption. In this work, we propose a design where a spin torque oscillator (STO) is integrated with a conventional magnetic tunnel junction (MTJ) which will assist in the ultrafast reversal of the magnetization of the free layer of the MTJ. The structure formed (MTJ stacked with STO), will have the free layer of …

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Behavior Of Small Variable Mass Particle In Electromagnetic Copenhagen Problem, Abdullah A. Ansari Apr 2025

Behavior Of Small Variable Mass Particle In Electromagnetic Copenhagen Problem, Abdullah A. Ansari

Sultan Qaboos University Journal For Science

The paper presents the behavior of the motion properties of the variable mass test particle (third body), moving under the influence of the two equal primaries having electromagnetic dipoles. These primaries move on the same circular path around their common center of mass in the same plane. We have determined the equations of motion of the test particle whose mass varies according to Jean's law. Using the system of equations of motion we have evaluated the locations of equilibrium points, their movements and basins of the attracting domain. Finally, we examine the stability of these equilibrium points, all of which …

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Mössbauer Study Of Weathered H-Meteorite From The Desert Of Oman, Ahmed D. Al-Rawas, Abbasher M. Gismelseed, Subhi Nasir, Ali A. Yousif, Mohamed E. Elzain, Hisham Widatallah, Ali Al-Kathiri, Susan Al-Riyami Apr 2025

Mössbauer Study Of Weathered H-Meteorite From The Desert Of Oman, Ahmed D. Al-Rawas, Abbasher M. Gismelseed, Subhi Nasir, Ali A. Yousif, Mohamed E. Elzain, Hisham Widatallah, Ali Al-Kathiri, Susan Al-Riyami

Sultan Qaboos University Journal For Science

A number of meteorites from the desert of Oman, classified as H-chondrites, with known and unknown ages, were studied by using 57Fe Mössbauer spectroscopy to determine their Fe3+-bearing compositions. Mössbauer spectra measured at 78 K were composed of paramagnetic doublets superimposed on magnetic sextets. The doublets are assigned to the silicate minerals olivine and pyroxene and Fe3+ phases. The magnetic sextets in most samples showed the presence of at least three magnetic phases, namely troilite, magnetite and kamacite, which commonly exist in most ordinary chondrites. The relative amounts (area %) of Fe3+ in the known-age meteorites, determined from the Mössbauer …

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Nutritional Value Of Vegetable Wastes As Livestock Feed, Osman Mahgoub, Hafidh Al-Mahrouqi, Sadeq Al-Lawati, Rabea Al-Muqbali Apr 2025

Nutritional Value Of Vegetable Wastes As Livestock Feed, Osman Mahgoub, Hafidh Al-Mahrouqi, Sadeq Al-Lawati, Rabea Al-Muqbali

Sultan Qaboos University Journal For Science

A study was carried out to evaluate the nutritional value of spirulina (Arthrospira platensis) to determine its potential use for feeding livestock in Oman. Spirulina was grown in wooden cubicles and harvested after 10 days. One batch of spirulina was dried by centrifugation (CS) and the other was dried in an oven without centrifugation (NCS). Samples were analyzed for dry matter (DM) and proximate chemical components. An in vitro assessment was carried out to measure gas production and in vitro DM degradability of spirulina. The DM was 56.1 and 57.1% in CS and NCS, respectively. The proximate composition for CS …

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Flora, Life-Forms And Biological Spectrum Of Muscat Governorate, Neelam Sherwani Apr 2025

Flora, Life-Forms And Biological Spectrum Of Muscat Governorate, Neelam Sherwani

Sultan Qaboos University Journal For Science

The present study evaluated the floristic diversity and biological spectrum of Muscat Governorate, Sultanate of Oman. Heterogeneity of geology, topography and climatic conditions create a diverse array of habitats across the 3,500 km2 study area, supporting a range of vegetation types. Floristic studies were conducted across 42 sites spread across various habitats such as sand dunes, alluvial plains, gravel plains, wadis, saline dunes, coastal areas, farms and plantations. A total of 264 species belonging to 183 genera and 54 families of angiosperm were documented during sampling the vegetation from different wilayats of the Governorate. Maximum number of species belonged to …

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Synthesis Of Pullulan-Mediated Silver Nanoparticles (Agnps) And Their Antimicrobial Activities, Yusra Al-Owasi, Abdulkhadir Elshafie, Nallusamy Sivakumar, Saif Al-Bahry Apr 2025

Synthesis Of Pullulan-Mediated Silver Nanoparticles (Agnps) And Their Antimicrobial Activities, Yusra Al-Owasi, Abdulkhadir Elshafie, Nallusamy Sivakumar, Saif Al-Bahry

Sultan Qaboos University Journal For Science

The synthesis of silver nanoparticles (AgNPs), using plant extracts, bacteria, fungi and yeasts, and their antimicrobial activities have been widely investigated and well documented. However, pullulan AgNPs and their antimicrobial activities have not received much attention. The objective of this study was to synthesize pullulan AgNPs, characterize them, and test their antibacterial and antifungal activities. Pullulan was extracted from Aureobasidium mangrovei isolated from Oman and, using UV-Vis spectroscopy and Fourier Transform Infrared (FT-IR), found to be identical to the commercial pullulan obtained from Sigma, USA. Transmission electron microscopy (TEM) showed that most of the synthesized particles were poly-dispersed, irregular in …

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Molecular Characterization Of Fumonisin Mycotoxin Genes Of Fusarium Sp Isolated From Corn And Rice Grains, Latifa Al-Husnan, Muneera Al-Kahtani, Randa Farag Apr 2025

Molecular Characterization Of Fumonisin Mycotoxin Genes Of Fusarium Sp Isolated From Corn And Rice Grains, Latifa Al-Husnan, Muneera Al-Kahtani, Randa Farag

Sultan Qaboos University Journal For Science

Fungi mycotoxins can be a serious risk to health and lead to substantial economic loss. The environmental conditions of Saudi Arabia, with its mostly warm temperatures, are conducive to the growth of toxigenic fungi resulting in mycotoxin production in different food items. The current study elucidates the natural occurrence of toxigenic fungi and mycotoxin production in grains in Saudi Arabia. Samples of white rice and corn (yellow, red) grains were collected from different local markets and houses. Three fungal isolates were obtained from the corn and rice grains and examined using Potato Dextrose Agar (PDA) and Carnation Leaf Agar (CLA) …

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Finite Element Convergence Analysis Of A Schwarz Alternating Method For Nonlinear Elliptic Pdes, Messaoud Boulbrachene Apr 2025

Finite Element Convergence Analysis Of A Schwarz Alternating Method For Nonlinear Elliptic Pdes, Messaoud Boulbrachene

Sultan Qaboos University Journal For Science

In this paper, we prove uniform convergence of the standard finite element method for a Schwarz alternating procedure for nonlinear elliptic partial differential equations in the context of linear subdomain problems and nonmatching grids. The method stands on the combination of the convergence of linear Schwarz sequences with standard finite element L-error estimate for linear problems.

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Zero-Hopf Bifurcation In The Generalized Stretch-Twist-Fold Flow, Niazy H. Hussein, Azad I. Amen Apr 2025

Zero-Hopf Bifurcation In The Generalized Stretch-Twist-Fold Flow, Niazy H. Hussein, Azad I. Amen

Sultan Qaboos University Journal For Science

A zero-Hopf equilibrium in a three-dimensional system is an isolated equilibrium point which has a zero eigenvalue and a simple pair of purely imaginary eigenvalues. In general, for such an equilibrium, there is no theory for finding when some periodic solutions are bifurcated by perturbing the parameters of the system. In this work, we describe the values of the parameters for which a zero-Hopf equilibrium occurs at the equilibrium points in the generalized stretch-twist-fold flow. Thus, only one condition for parameters of the generalized stretch-twist-fold flow introduced in a system (Eq. 1) is found for which the equilibrium point is …

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Connected Components Of The Hurwitz Space For The Symmetric Group Of Degree 7, Haval M. Mohammed Salih, University Of Raparian, College Of Basic Education, Department Of Mathematic, Ranya, Kurdistan Region Of Iraq Apr 2025

Connected Components Of The Hurwitz Space For The Symmetric Group Of Degree 7, Haval M. Mohammed Salih, University Of Raparian, College Of Basic Education, Department Of Mathematic, Ranya, Kurdistan Region Of Iraq

Sultan Qaboos University Journal For Science

The Hurwitz space is the space of genus covers of the Riemann sphere with branch points and the monodromy group . Let be the symmetric group . In this paper, we enumerate the connected components of . Our approach uses computational tools, relying on the computer algebra system GAP and the MAPCLASS package, to find the connected components of . This work gives us the complete classification of primitive genus zero symmetric group of degree seven.

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Eventually Pointed Principally Ordered Regular Semigroups, G.A. Pinto Apr 2025

Eventually Pointed Principally Ordered Regular Semigroups, G.A. Pinto

Sultan Qaboos University Journal For Science

An ordered regular semigroup, , is said to be principally ordered if for every there exists . A principally ordered regular semigroup is pointed if for every element, we have . Here we investigate those principally ordered regular semigroups that are eventually pointed in the sense that for all there exists a positive integer, , such that . Necessary and sufficient conditions for an eventually pointed principally ordered regular semigroup to be naturally ordered and to be completely simple are obtained. We describe the subalgebra of generated by a pair of comparable idempotents and such that .

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Assessment Of Heavy Metal Contamination In Soil In And Around Sohar Industrial Port Area, Oman, Maha Al-Jabri, Daniel Moraetis, Reginald Victor Apr 2025

Assessment Of Heavy Metal Contamination In Soil In And Around Sohar Industrial Port Area, Oman, Maha Al-Jabri, Daniel Moraetis, Reginald Victor

Sultan Qaboos University Journal For Science

The increase in the number of heavy metal emitting sources in industrial areas is a serious issue in pollution science. Sohar Industrial Port (SIP) area is located in the northern part of Oman where different industrial activities like petrochemical production, metal processing, and waste disposal are prevalent. This study comprehensively identified the presence and quantities of heavy metals in the soils of Sohar Industrial Port area and traced their origin to geogenic or anthropogenic sources. Bulk geochemical and mineralogical analyses were carried out on all samples. Environmentally available and bioavailable heavy metals were extracted by diethylenetriaminepentaacetic acid (DTPA) and were …

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Preliminary Investigations Of Allelopathic Effects And Herbicide-Based Eradication Of Mesquite (Prosopis Juliflora), Salim Al-Abdali, Azan Al-Dhuhli, Hassan Al-Reasi Apr 2025

Preliminary Investigations Of Allelopathic Effects And Herbicide-Based Eradication Of Mesquite (Prosopis Juliflora), Salim Al-Abdali, Azan Al-Dhuhli, Hassan Al-Reasi

Sultan Qaboos University Journal For Science

Velvet mesquite, locally known as al-ghaf bahri (Prosopis juliflora), is a well-known invasive alien plant species in several regions around the world, including Oman, with various environmental effects. The allelopathic effect of P. juliflora leaves and seed pods on native ghaf (P. cineraria) and a crop species, mung bean (Vigna radiata) was demonstrated. Results indicated that P. juliflora extracts have inhibitory effects on seed germination and seedling growth of both species, particularly on P. cineraria when exposed to pod extracts. For eradication experiments, three herbicides (tribenuron methyl, clethodim and 2,4-D & MCPA) were investigated to determine their inhibitory properties on …

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Effect Of Alarm Chemicals And Predator Kairomones On The Behaviour Of Two Species Of Mosquito Larvae, Derek Roberts, Nargis Al-Alawi, Mai Al-Gharibi Apr 2025

Effect Of Alarm Chemicals And Predator Kairomones On The Behaviour Of Two Species Of Mosquito Larvae, Derek Roberts, Nargis Al-Alawi, Mai Al-Gharibi

Sultan Qaboos University Journal For Science

Mosquito larvae have developed a variety of responses to reduce the risk of predation, but this requires them to be able to identify the different species of predators and respond accordingly. We investigated the behavioural response of two mosquito species to three chemical signals: kairomones from two predators, and also to alarm semiochemicals from killed mosquito larvae. Culex perexiguus mosquito larvae are primarily surface filter-feeders. In response to all three chemical signals, they significantly reduced feeding by the high-risk active bottom scraping of biofilms in favour of the less active (and so lower predator-detection risk) surface filter feeding. Active escape …

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Radiometric Surveys For Detection Of Uranium In Dhofar Region, Sultanate Of Oman, Narasimman Sundararajan, Bernhard Pracejus, Salah Al-Khirbash, Talal Al-Hosni, Ala Ebrahimi Ebrahimi, Ali Al-Lazki, Musallam Al-Mushani Apr 2025

Radiometric Surveys For Detection Of Uranium In Dhofar Region, Sultanate Of Oman, Narasimman Sundararajan, Bernhard Pracejus, Salah Al-Khirbash, Talal Al-Hosni, Ala Ebrahimi Ebrahimi, Ali Al-Lazki, Musallam Al-Mushani

Sultan Qaboos University Journal For Science

The Proterozoic basement of the Dhofar region of the Sultanate of Oman might be considered as a potential source of Uranium mineralization like other Proterozoic basins of the world, which collectively contribute 30%-40% to the global production. Uranium exploration assumes great importance in this part of the world and therefore geochemical and geophysical exploration for Uranium was initiated. Initial, random sampling of the study area with Gamma ray spectrometry as well as in situ XRF (Xray Florescence) analysis indicated the presence of around 30-40 ppm of Uranium. Since Gamma ray spectrometry results in the calculation of the heat produced during …

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Preparation And Characterization Of Acidic, Basic And Hydrophobic Dehydrated Carbons And Their Capability For Methylene Blue Adsorption, El-Said El-Shafey, Syeda N.F. Ali, Haider Al-Lawati, Saleh Al-Busafi Apr 2025

Preparation And Characterization Of Acidic, Basic And Hydrophobic Dehydrated Carbons And Their Capability For Methylene Blue Adsorption, El-Said El-Shafey, Syeda N.F. Ali, Haider Al-Lawati, Saleh Al-Busafi

Sultan Qaboos University Journal For Science

Dehydrated carbon (DC) was prepared from date palm leaflets via sulfuric acid treatment. DC was functionalized via amide coupling using ethylene diamine (EDA) and propylene diamine (PDA) to produce basic dehydrated carbons (BDCs): BDC-EDA and BDC-PDA, respectively, and using ethylamine (EA) and aniline (AN) to produce hydrophobic dehydrated carbons (HDCs): HDC-EA and HDC-AN, respectively. Surface areas were found low, between 6.7-16 m2/g with mesoporosity domination. FTIR shows that –COOH content on DC almost disappeared after surface functionalization. Faster adsorption of methylene blue with larger adsorption capacity was found on HDC-EA than other adsorbents because of stronger hydrophobic interaction forces.

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Petroleum Hydrocarbon Residues In Surficial Sediment Samples From Aden City Coasts, Yemen, Ibrahim Al-Akhaly, Nabil Al-Shwafi, Basem Al-Matari, Eman I.Siam Apr 2025

Petroleum Hydrocarbon Residues In Surficial Sediment Samples From Aden City Coasts, Yemen, Ibrahim Al-Akhaly, Nabil Al-Shwafi, Basem Al-Matari, Eman I.Siam

Sultan Qaboos University Journal For Science

The environmental quality along Aden coasts is affected by the anthropogenic pressure of Aden city. Field work has been carried out to investigate the occurrence of petroleum pollution along these coasts. To determine the status of aliphatic hydrocarbon (AH) (n-C10 to n-C34) and polycyclic aromatic hydrocarbon (PAH) pollution in surface sediments, twenty seven surface sediment samples were collected in July and December 2014 and March 2015 and analysed for AHs and PAHs by using gas chromatography–mass spectrometry (GC-MS) to determine their levels and sources. Concentrations of AHs ranged from 6.25 µg/g at station 5 (Goldmoor) to 41.05 µg/g at station …

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Two Groups 2^3.〖Psl〗_2 (7) And 2^3:〖Psl〗_2 (7) Of Order 1344, Mehmet Koca, Ramazan Koc, Nazife O.Koca Apr 2025

Two Groups 2^3.〖Psl〗_2 (7) And 2^3:〖Psl〗_2 (7) Of Order 1344, Mehmet Koca, Ramazan Koc, Nazife O.Koca

Sultan Qaboos University Journal For Science

No abstract provided.

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An Overview Survey Of Recent Routing Protocols For Underwater Wireless Sensor Networks, Al-Salti Faiza A., Al-Zeidi Nasser M., Day Khaled, Arafeh Bassel, Touzene Abderezak Apr 2025

An Overview Survey Of Recent Routing Protocols For Underwater Wireless Sensor Networks, Al-Salti Faiza A., Al-Zeidi Nasser M., Day Khaled, Arafeh Bassel, Touzene Abderezak

Sultan Qaboos University Journal For Science

With the recent advances in underwater sensor devices and technologies, underwater wireless sensor networks (UWSNs) enable a variety of applications such as underwater exploration and monitoring, disaster prevention, and military surveillance and reconnaissance. However, these kinds of networks faces a number of challenges induced by the nature of the underwater environment and its influence on the physical media. Therefore, new routing protocols are proposed specifically for such networks to mitigate these challenges. This paper surveys some of the recent routing protocols for UWSNs. Specifically, the idea of each protocol is presented as well as its advantages and disadvantages. Furthermore, the …

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Effect Of Management System On Serum Copper Level And Haematology Of Jabal Akhdar Breed Goats In Two Sites In Al Jabal Al Akhdar Region Of Oman, I.E.D. Osman Nur El Huda, Bobade Patrick A. Apr 2025

Effect Of Management System On Serum Copper Level And Haematology Of Jabal Akhdar Breed Goats In Two Sites In Al Jabal Al Akhdar Region Of Oman, I.E.D. Osman Nur El Huda, Bobade Patrick A.

Sultan Qaboos University Journal For Science

ABSTRACT: Blood samples were collected from randomly selected healthy Jabal Akhdar breed goats reared in two sites in the Jabal Akhdar region of Oman. Seven males and 65 female goats, age range 2 months to 4 years, raised in Shnoot Al-Dar village were kept under a semi-intensive system (SIS) and 2 males and 18 females, age range 4 months to 5 years, raised in Al-Ala'lana village and kept the under free range system (FRS) were studied. Serum Cu and haematological values were measured. There were no significant (p>0.05) effects of age, sex or serum copper levels on the haematology …

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