Bahadi M.A.,National University of Malaysia |
Bahadi M.A.,Hadhramout University |
Salimon J.,National University of Malaysia |
Japir A.-W.M.,National University of Malaysia
AIP Conference Proceedings | Year: 2016
This study was carried out to determine the physicochemical properties and the thermal behavior of Malaysian high free fatty acid crude palm oil (HFFA-CPO). The physicochemical properties showed that the free fatty acid (FFA %), acid value, iodine value, saponification value, unsaponifiable matter, hydroxyl value, specific gravity, refractive index at 28°C, moisture content, viscosity at 28°C and colour at 28°C values were 9.4±0.1 %, 21.3±0.1 mg/g, 50.6±0.2 mg/g, 203.1±0.1 mg/g, 0.7±0.1%, 43.4±0.2 mg/g, 0.878 g/ml, 1.4669, 0.6 %, 52 cP and 50R-40Y respectively. Gas chromatography (GC) was used to determine the fatty acid (FA) composition in HFFA-CPO. The fatty acids were found to be comprised mostly with 45.7 % palmitic acid (C16:0), 39.5 % oleic acid (C18:1), 9.4 % linoleic acid (C18:2) and 4.3 % stearic acid (C18:0). The analysis of triacylglycerol components with high performance liquid chromatography (HPLC) has resulted with 3.5 % triunsaturated (OOO, OLL and OLO), 32.7 % monosaturated (POO, PLO, SOO and PLL), 35.7 % disaturated (MLP, PPL, PPO, POS and SOS) and 2.32 % trisaturated fatty acids (PPP and PPS). The differential scanning calorimetry (DSC) showed that the crystallization of TAG displayed two major exothermic regions of HFFA-CPO with the di and trisaturated TAG at 23.11°C and the di and triunsaturated TAG at 9.31°C. The melting curve displayed multiple endothermic peak regions at 25.13°C and 35.31°C could be attributed to the di and trisaturated TAGs. While the peaks at 0.95°C, 6.94°C and 9.77°C could be attributed to the mono, di and triunsaturated TAGs. © 2016 Author(s).
Al Haj A.E.,King Abdulaziz University |
Al Haj A.E.,Hadhramout University |
Al Aidaroos A.M.,King Abdulaziz University |
Kumar A.A.J.,King Abdulaziz University
Marine Biodiversity | Year: 2017
Ovigerous females of Cymo melanodactylus, C. andreossyi and C. quadrilobatus were collected from a coral reef, Jeddah (Biadah, Obhur) and Thuwal, Saudi Arabia and reared in the laboratory. The morphological features of the zoea I of C. andreossyi, and zoeae I and II of C. quadrilobatus, as well as the complete larval stages of C. melanodactylus, have been described for the first time. Some characters distinguish these species: cephalothorax size; ratio of the length of antennal protopod and exopod; setations of the endopod of second maxilliped and the presence of a small tooth on the basal endite of the maxillule in the zoea I of C. melanodactylus and C. andreossyi. Morphological features of cephalothorax spines, setations of the endopod of antenna, first and second maxillipeds and the inner spines of telson change as the larval stages of C. melanodactylus progress. The morphological features of the zoeal and megalopal stages of the above-mentioned crabs were compared with those of the larvae of some conspecifics and other xanthid larvae described from the Red Sea. The megalopa of C. melanodactylus can easily be differentiated from those of Chlorodiella nigra and Leptodius exaratus by the setations of the exopod and endopod of antennule, antenna, maxillule and first to third maxillipeds. © 2017 Senckenberg Gesellschaft für Naturforschung and Springer-Verlag GmbH Germany
Alsobaai A.,Hadhramout University
Journal of Engineering Research | Year: 2017
This work investigated the nitrous oxide (NOx) storage process using alumina-based catalysts (K2O/Al2O3, CaO/Al2O3, and BaO/Al2O3). The feed was a synthetic exhaust gas containing 1,000 ppm of nitrogen monoxide (NO), 1,000 ppm i-C4H10, and an 8% O2 and N2 balance. The catalyst was carried out at temperatures between 250-450°C and a contact time of 20 minutes. It was found that NOx was effectively adsorbed in the presence of oxygen. The NOx storage capacity of K2O/Al2O3 was higher than that of BaO/Al2O3. The NOx storage capacity for K2O/Al2O3 decreased with increasing temperature and achieved a maximum at 250°C. Potassium loading higher than 15% in the catalyst negatively affected the morphological properties. The combination of Ba and K loading in the catalyst led to an improvement in the catalytic activity compared to its single metal catalysts. As a conclusion, mixed metal oxide was a potential catalyst for de-NOx process in meeting the stringent diesel engine exhaust emissions regulations. The catalysts were characterized by a number of techniques and measurements, such as X-ray diffraction (XRD), electron affinity (EA), a scanning electron microscope (SEM), Brunner-Emmett-Teller (BET) to measure surface area, and pore volume and pore size distribution assessments.
Norania A.A.,University of Technology Malaysia |
Ahmad A.,University of Technology Malaysia |
Khalil M.A.R.,Hadhramout University |
Al-Shanini A.,University of Technology Malaysia
Chemical Engineering Transactions | Year: 2017
In ensuring safety of plant operation, both the reliability of plant components and human resources are important. Moving towards optimising resources, there is a need to prioritise intervention measures such as maintenance program and review of standard operating procedures. In this paper, a technique known as basic event ranking approach (BERA) is applied to a hydrogen station. BERA examines the relative importance of plant components based on their probability of failure within the realm of fault tree analysis model, and yields values of importance index for each basic event investigated. To incorporate changes in reliability data throughout the plant lifetime, a dynamic extension to BERA is introduced. The vulnerability of plant components and human actions are ranked with respect to the selected top events of fault trees generated from plant functions. The results revealed the potential of BERA to facilitate risk-based intervention initiatives to support process safety. Copyright © 2017, AIDIC Servizi S.r.l..
Webair H.H.,Hadhramout University |
Bin Ghouth A.S.,Hadhramout University
BMC Public Health | Year: 2014
Background: Globally, about seven million children under the age of five died in 2011. Local illness concepts are thought to be related to inappropriate health-seeking behaviour, and therefore, lead to child mortality. The aim of this study was to contribute to the definition of common local illness concepts with their effects on health-seeking behaviour for common childhood illnesses. Methods. A qualitative focus group study was conducted between April 1 and 6, 2013. Participants were drawn purposefully from the vaccination unit at Shuhair Health Centre in Yemen. Four focus group discussions were conducted. The total number of participants was 31 mothers with at least one child under the age of five with a history of fever, diarrhoea, cough, or difficulty breathing during the 14 days preceding the study. Data was collected and analysed using micro-interlocutor analysis. Results: The mean age of the participants was 31 years (SD ± 4). There was remarkable concordance in local illness concepts across the focus groups. During focus group discussions, six local illness concepts (Senoon, lafkha, halib, didan, raqaba, and ayn) were mentioned. Local illness concepts determined the type of treatment. Most of these illnesses were not treated medically. Lafkha, halib, raqaba, and ayn were always classified as "not for medical treatment", whereas senoon and didan as sometimes "not for medical treatment". For medical symptoms, i.e. fever, diarrhoea, cough, and difficulty breathing, medical therapy was usually an option; these were classified as never or sometimes "not for medical treatment". Mothers trust in traditional medicine and believe that it is always beneficial and never harmful. The participants do not disclose traditional medicine use with their doctors because doctors oppose these practices and are not open enough to these types of treatment. Conclusions: Local illness concepts for common child illnesses are widespread, and they determine the type of treatment used. Interventions to improve children's health should use local illness concepts to educate parents. Traditional medicine as a treatment option in primary care should be considered. © 2014 Webair and Bin Ghouth; licensee BioMed Central Ltd.
Hamada G.M.,United Arab Emirates University |
Almajed A.A.,King Fahd University of Petroleum and Minerals |
Okasha T.M.,Saudi Aramco |
Algathe A.A.,Hadhramout University
Journal of Petroleum Exploration and Production Technology | Year: 2013
Reservoir evaluation is one of the critical tasks of any reservoir exploration and field development plan. Water saturation calculated from open-hole resistivity measurements is a primary input to hydrocarbon reserves evaluation. Archie's equation is the water saturation model for the determination of water saturation. Application of Archie equation in carbonate reservoir is not easy due to high dependency of its parameters on carbonate characteristics. Determination techniques of Archie's parameters are relatively well known and validated for sandstone reservoirs, while carbonates are heterogeneous and a correct estimation of Archie' parameter is important in their evaluation. In the case of carbonate rocks, there are considerable variations in texture and pore type, so, Archie's parameters become more sensitive to pores pattern distribution, lithofacies properties and wettability. Uncertainty in Archie's parameters will lead to non-acceptable errors in the water saturation values. Uncertainty analysis has shown that in calculating water saturation and initial oil in place, the Archie's parameters (a, m, n) have the largest influence and Rt and Rw are the least important. The main objective of this study was to measure Archie's parameters on 29 natural carbonate core plugs at reservoir conditions, using live oil, these core samples were taken from three wells. For this purpose, three techniques were implemented to determine Archie's parameters; conventional technique, core Archie's parameters estimate technique and three-dimensional technique. Water saturation profiles were generated using the different Archie parameters determined by the three techniques. These profiles have shown a significant difference in water saturation values and such difference could be mainly attributed to the uncertainty level for the calculated Archie parameters. These results highlight the importance of having accurate core analysis's measurements performed on core samples that yield representative a, m and n values that highly influence the water saturation values. © 2012 The Author(s).
Bahartha A.S.,Hadhramout University |
Alezzi J.I.,Hadhramout University
Saudi Medical Journal | Year: 2015
Objectives: To assess the risk factors associated with diarrhea among children below 5-years-old in Mukalla, Yemen, and compare with other studies. Methods: We conducted a case-control study on 200 children (100 cases and 100 controls) who attended the Maternity and Child Hospital, outpatient-clinics, and the Primary Health Care Centers in Al-Mukalla, Hadhramout, Yemen between February and April 2013. Results: We found that the significant risk factors associated with diarrhea were crowded housing (odds ratio [OR] 2.02; p=0.02; confidence interval [CI] 1.03-4.01), incomplete vaccination of the child (OR=2.02; p=0.027; CI: 1.08-3.8), and recurrent diarrheal illness during the last 3 months (OR=6.61; p=0.001; CI: 3.41-12.90). Conclusion: Diarrheal diseases are strongly associated with incomplete vaccination, recurrent diarrheal disease, and crowded housing. © 2015, Saudi Med J. All Rights Reserved.
Alayouty H.D.,Suez Canal University |
Hasan T.M.,Suez Canal University |
Alhadad Z.A.,Hadhramout University |
Barabba R.O.,Hadhramout University
Interactive Cardiovascular and Thoracic Surgery | Year: 2011
The current study is designed to compare the effectiveness of brushing the pleura vs. instillation of minocycline for the management of primary spontaneous pneumothorax, and to assess the sensitivity of echography in defining areas of defects. Blebectomy and pleurodesis were carried out thoracoscopically on 84 patients. In group A (42 patients), abrasions were induced using a sponge on a long ring forceps. Group B (42 patients) received intrapleural instillation of minocycline. Echography was carried out two weeks after discharge and then repeated two weeks later. Follow-up ranged between 28 and 39months. Two patients were excluded from group A for incomplete follow-up. In group A, five patients (12%) showed areas of free mobility of the lung on first echography. At the second examination, three (7% of the total) showed the same areas of mobility; one patient developed an attack of localized pneumothorax after 32 and another after 45weeks. Each had three adjacent areas of free mobility. In group B, two patients each showed one area of free mobility on the first and second examinations but no recurrence during follow-up. The two groups had comparable chest drainage, postoperative hospital stay and complication rates. The patients in group B demonstrated a trend towards a decreased rate of prolonged air leaks (2% vs. 5%; P=0.100). Thus, pleurodesis by instillation of minocycline as a part of thoracoscopy is more effective than brushing the pleura. Thoracic echography is a highly sensitive method for assessing the effectiveness of pleurodesis. © 2011 Published by European Association for Cardio-Thoracic Surgery. All rights reserved.
Bin-Thalab R.,Hadhramout University |
El-Tazi N.,Cairo University
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2015
Managing temporal data gets increased demand for many significant areas such as scientific and financial applications. This paper proposes a new index (TOIX), which is designed in order to provide more efficient evaluation of temporal queries on XML documents. The index lies on mapping the twigs into temporal objects and then using these objects instead for answering the query. An improvement of the naive algorithm using a B-tree as well. Finally, a set of conducted experiments were performed and showed that our proposed algorithm outperforms the state of the art indexing algorithms in certain cases. © Springer International Publishing Switzerland 2015.
PubMed | Hadhramout University
Type: Journal Article | Journal: Saudi medical journal | Year: 2016
To describe the patterns of childhood cancers in Hadhramout Sector, Yemen between January 2002 and December 2014.This descriptive retrospective study was based on secondary data from Hadhramout Cancer Registry, Hadhramout, Yemen. All Yemeni childrenunder age of 15 years, who were diagnosed with cancer were included. The International Childhood Cancer Classification system was used to categorize cancer types.A total of 406 childhood cancers of both gender less than 15 years of age were reported. These represented 8.5% of all cases registered. The mean age was 7.34 4.18 years. There were 240 males (59.1%) and 166 females (40.9%) with a male to female ratio of 1.4:1. Calculated incidence of cancer in children in this population is 1.9 per 100,000. The predominant age group was 5-9 years (35%) followed by 10-14 years (33.7%), and 0-4 years group (31%). The most common group of malignancies were hematological malignancies accounting for 47% of cases, followed by nervous system malignancies (15%). The most frequently reported cancer types were lymphoma (24%), leukemia (23%), carcinoma (13.1%), and central nervous system (CNS) tumors (11.6%).There is a lower frequency of childhood cancer in Hadhramout Sector when compared with developed countries. The most common cancers among children were lymphoma, leukemia, carcinoma, and CNS tumors.