Papers by Ibrahim Abdulrahman
IOP conference series, 2020
A vitreous enamel coat is a thin layer of glass, typically a few hundred microns in thickness, wh... more A vitreous enamel coat is a thin layer of glass, typically a few hundred microns in thickness, which is fused onto a metal substrate. The glass used for vitreous enamelling is referred to as the 'frit' and is formulated from a wide range of inorganic raw materials including quartz, borax and titania. This research called for the preparation and development of a mixture of ceramic materials, consisting of various metal oxides, for coating low-alloy steel plates with a carbon percentage of 0.18%. A single coating layer was used with a dipping method. Before dipping, the samples were treated with sand blasting. The effects of heat treatment temperature and time, the percentage of quartz additions and coating powder particle sizes were all studied. It was found that crystalline phases (such as (SiO2), (Na2O-Al2O3-TiO2-SiO2), (Li5AlSi2O8), (TiO2)) were developed in the structure of the coating after heat treatment processing. The results showed significant improvement in all properties of coating hardness, adhesion, thermal stability and chemical resistance by increase in the heat-treating temperature and time; the best results were obtained in the properties of the coating with the treatment temperature at 650 ° C, a time of 120 minutes and 15% quartz addition. The results also showed a clear effect of the particle size of powder coating on the properties of hardness and adhesion. When the particle size decreased, the mechanical properties (hardness, adhesion) and thermal stability improved. The results indicated that the increase in coating particles' size led to an increase in the coating thickness.
Journal of Ecosystem & Ecography, Jun 25, 2013
R ecent international effort regarding global warming has focused on Kyoto protocol. At the Earth... more R ecent international effort regarding global warming has focused on Kyoto protocol. At the Earth summit in 1992, the World agreed to prevent "dangerous" climate change. The first step was the 1997 Kyoto protocol, which finally came into force in 2005. It will bring modest emission reduction from industrialized countries. But many observers say deeper cuts are needed from developing nations that have large growing populations and depend on climate deriving agriculture. In that context, the use of biological to absorb or reduce emissions of carbon dioxide (CO 2) (often referred to as carbon "sink") has to be employed. The Kyoto Protocol required a reduction of about 0.2billion ton of carbon/year during the 5years commitment period or a total of 1 billion tons of Carbon. The bottom line is that we will need to cut CO 2 emission by 70% to 80% simply to stabilize atmospheric CO 2 concentrations-and thus temperatures. The quicker we do that, the less unbearably hot our future world will be. Agriculture is an accumulator of carbon dioxide, offsetting losses when organic matter is accumulated in the soil or when above-ground woody biomass acts either as permanent sink or as energy sources that substitute for fossil fuels. Agriculture activities can help to reduce and avoid the atmospheric build up of CO 2 , CH 4 and N 2 O in a number of ways. It is widely accepted that Carbon dioxide in the atmosphere can be remove by plant via photosynthesis which increases the amount of Carbon stored in vegetation (living above and below ground biomass). As the live biomass dies the carbon is then stored as dead organic matter (such as litter and dead wood) until it decomposes and some transferred to mineral soil. If the trees are harvested, some of the carbon is stored in durable wood products The paper looks at the influence/role of agricultural activities in carbon mitigation as carbon sinks to abate climate change and suggest some ways forward especially as its affects developing nations like Nigeria.
This thesis reviews some features of the PDM Lagrangians. We reach the mapping of the PDM equatio... more This thesis reviews some features of the PDM Lagrangians. We reach the mapping of the PDM equation into a unit-mass Lagrangian in the generalized coordinates by the insertion of a nonlocal point transformation. The invariance of the PDM Euler-Lagrange equations under specific conditions is proved. We analyze the dynamical equations obeyed by nonlinear oscillator systems with position-dependent mass. Four classes of such examples with PDM-nonlinear oscillators are specified. They include Mathews-Lakshmanan oscillators, a quadratic nonlinear oscillator, a Morse-type oscillator, and a nonlinear deformation of an isotonic oscillator. Attainment among them the mapping of an isotonic nonlinear oscillator into a PDM deformed isotonic oscillator.
Mu`'am shuyukh al-hafiz al-Dimyati min bidayat al-kitab ila nihayat al-juz' al-khamis : dirasah wa-tahqiq wa-tahdhib = Mu'jam suyukh al-hafiz al-Dimyati from the beginning of the book until chapter five : an analysis, critique and summarization / Ibrahim Najm Abdulrahman
Zenodo (CERN European Organization for Nuclear Research), Jan 3, 2023
Academic Journal of Nawroz University
تسعى هذه الدراسة إلى تحقيق أثر الاستثمار الاجنبي المباشر في الأداء المالي للشركات متعددة الجنسيات... more تسعى هذه الدراسة إلى تحقيق أثر الاستثمار الاجنبي المباشر في الأداء المالي للشركات متعددة الجنسيات خلال مدة الدراسة، وتم تطبيق مجموعة من المؤشرات والنسب المالية لتحليل البيانات التاريخية للشركات الاجنبية عينة الدراسة للمدة من (2009-2018)، فضلاً عن تطبيق عدد من الاساليب الاحصائية لتحليل العلاقة بين متغيرات الدراسة. وتوصلت الدراسة إلى مجموعة من الاستنتاجات، أهمها هي: تنصب أغلب استثمارات الشركات عينة الدراسة في فرع إقليم كوردستان العراق، وتعد ذلك اهتمام هذه الشركات الاجنبية باقتصاد الإقليم، وهذه دلالة على مدى اعتماد الشركات الرئيسة على فرع الإقليم، كما وتبين من التحليل المالي للدراسة أن فرع الإقليم له تأثير كبير على أداء الشركة الرئيس. واعتماداً على ما توصلت إليه الدراسة من الاستنتاجات؛ تم تقديم مجموعة من المقترحات منها: دراسة عدة بدائل مختلفة من اجل اختيار البديل الأفضل والاستفادة أكثر من الاستثمار.
DOAJ (DOAJ: Directory of Open Access Journals), Nov 15, 2021
Natural gas is the most widespread fossil fuel nowadays, used both domestically and in industry. ... more Natural gas is the most widespread fossil fuel nowadays, used both domestically and in industry. Its processing is highly energy and cost intensive and consists of multiple steps. The gas dehydration is an essential and irreplaceable process because water content minimization is crucial in prevention of hydrate formation, electrochemical corrosion control as well as for subsequent cryogenic processing if present. Despite its importance, the dehydration step is often designed and operated based on rules of thumb and good practice instead of a systematic approach. This makes dehydration an adequate candidate to apply a previously suggested complete and concise Process Intensification (PI) framework developed specifically for oil & gas (O& G) industry. This framework suggests the Rated Energy Consumption (REC) as the key and measurable driver for design and implementation of PI tools. This paper presents a case study on absorption dehydration using triethylene glycol (TEG). The study is based on an existing facility. First, a process model was built and used to evaluate REC of the system with three main contributors: reboiler, stripping gas and circulation pump. For a PI analysis, two key process parameters affecting the REC were identified, i.e. TEG circulation rate and stripping gas consumption. Using response optimization, it was shown that the original design point is sub-optimal with respect to REC and indirect CO2 emissions, which could be reduced by 23 and 19 % respectively, while maintaining the product water content. The outcome of this work represents an important foundation for future PI within a more complex dehydration process considering also cooling and condensation upstream of the TEG unit and adsorption as a subsequent step.
Background: Pulmonary artery hypertension (PAH) in the setting of end-stage renal disease (ESRD) ... more Background: Pulmonary artery hypertension (PAH) in the setting of end-stage renal disease (ESRD) has important prognostic and therapeutic consequences. We estimated the prevalence of PAH among patients with ESRD treated with automated peritoneal dialysis (APD), investigated the effect of different variables and compared pulmonary artery pressure and cardiac function at the beginning and end of the study. Methods: The study that started on 2015 and extended till 2020. Thirty-one ESRD patients on APD were recruited after ful lling inclusion criteria. Blood samples were collected from all patients for the biochemical and hematological data at the beginning of the study and every month and at the study termination. Total body water (TBW) and extracellular water (ECW) were calculated using Watson's and Bird's calculation methods. All patients were followed-up monthly by cardiologist for an echocardiographic examination. Cox regression analysis was used to assess the relation between different variables and PAH. Results: The mean age of the study population (n=31) was 51.23±15.24 years. PAH was found in 24.2% of the patients. Mean systolic pulmonary artery pressure (sPAP) and mean pulmonary artery pressure (mPAP) were signi cantly higher in the APD patients at study initiation than at the end of the study (40.75 + 10.61 vs 23.55 + 9.20 and 29.66 + 11.35 vs 18.24 + 6.75 mmHg respectively, p = 0.001). The median ejection fraction was signi cantly lower in patients with PAH at zero point than at study termination [31% (27-34) vs 50% (46-52), p = 0.002]. Hypervolemia decreased signi cantly at the end of study (p <0.001) and correlated positively with the PAP (r = 0.371 and r = 0.369), p = 0.002). sPAP correlated with left ventricular mass index, hemoglobin level, and duration on APD. Conclusions: Long term PD (> 2 years) seemed to decrease pulmonary artery pressure, right atrial pressure and improve left ventricular ejection fraction (LVEF). Risk factors for PAH in ESRD were hypervolemia, abnormal ECHO ndings and low hemoglobin levels. Clinical and echocardiographic abnormalities and complications are not uncommon among ESRD patients with PAH. Identi cation of those patients on and transthoracic echocardiography may warrant further attention to treatment with APD.
Iraqi Journal of Science, Jul 17, 2019
In this research, the frequency-frequency interactions in chaotic systems has been experimentally... more In this research, the frequency-frequency interactions in chaotic systems has been experimentally and numerically studied. We have injected two frequencies on chaotic system where one of these frequencies is modulated with chaotic waveform and the other is untiled as a scanning frequency to find modulating frequency. It is observed that the Fast Fourier Transformation (FFT) peaks amplitude increased when the value of the two frequencies are matched. Thus, the modulating frequency could be observed, this leads to discover a new method to detect the modulating frequency without synchronization.
Clinical Depression, 2018
Somnipathy can be categorized in to insomnia disorders, sleep-related breathing disorders, centra... more Somnipathy can be categorized in to insomnia disorders, sleep-related breathing disorders, central disorders of hyper somnolence, circadian rhythm sleep-wake disorders, sleep-related movement disorders, parasomnias, and others. It can be primary or secondary, signs and symptoms of which include exorbitant daytime sleepiness, irregular breathing or increased movement during sleep and difficulty falling asleep. A few outcomes of sleep loss are obesity in adults and children, diabetes and impaired glucose tolerance, cardiovascular disease and hypertension, anxiety symptoms, depressed mood and alcohol use. Sleep disorders are frequently associated with psychiatric issues particularly depression. Studies have demonstrated that individuals with a sleeping disorder have a ten times risk of having depression in contrast to individuals who rest soundly. OSA is also linked with depression. SSRIs which increase 5-HT function increase REM sleep latency, and reduce REM sleep. Some individuals show significant improvements in depressive symptoms following a night of incomplete or complete lack of sleep, leading physicians to consider using sleep deprivation as an intervention. Antidepressants and other treatments for depression can have a beneficial effect on sleep. There is a need to evaluate for primary somnipathies, any medications being taken and underlying medical, psychiatric or substance use disorder.
Background: Different percutaneous coronary intervention (PCI) strategies, including the use of s... more Background: Different percutaneous coronary intervention (PCI) strategies, including the use of single long stents (SLSs) and overlapping multiple stents (OMSs), have been introduced to treat very long coronary lesions (VLCLs). The aim of this study was to compare procedural and long-term clinical outcomes between SLSs and OMSs in patients with VLCLs. Methods: In this historical cohort study, 1709 patients who underwent PCI with the new generation of drug-eluting stents (length ≥38 mm) were stratified into the SLS [PROMUS /Resolute/XIENCE (PRX), (=38 mm), n=1121 (65.59%) and BioMime, (≥40 mm), n=124 (7.26%)] and OMS [(59.43±10.80 mm), n=464 (27.2%)] groups and followed up for 440.93±361.32 days. The study endpoints comprised immediate post-PCI outcomes, major adverse cardiovascular events (MACE), the patientoriented composite endpoint (POCE), and the device-oriented composite endpoint (DOCE) at the long-term follow-up. Results: The mean age of the patients was 59.28±10.60 years, and 69.6% of them were male. Flow grade 3 (P=0.296) and residual stenosis (P=0.533) were statistically similar between all the groups. A lower level of post-PCI troponin was observed in the BioMime group [
The journal of Tehran Heart Center, 2010
Splenomegaly-induced thrombocytopenia is fully described in hematological and surgical literature... more Splenomegaly-induced thrombocytopenia is fully described in hematological and surgical literature, but its association with severe aortic stenosis is rare. We present a case of severe aortic valve stenosis with severe splenomegaly-induced thrombocytopenia in which aortic valve replacement was done with a number 23 homograft and splenectomy was performed after the end of cardiopulmonary bypass. Platelet count turned to normal value post-operatively, and the patient spent an ordinary convalescence period and was discharged from the hospital without any complications.
Gastroesophageal reflux in bronchial asthma patients. A clinical note
Saudi medical journal, 2003
The objective is to correlate the symptoms of gastroesophageal reflux with the results of esophag... more The objective is to correlate the symptoms of gastroesophageal reflux with the results of esophageal reflux with the results of esophageal pH metry in asthmatic patients. A prospective study was carried out in King Fahd Hospital of the University, Al-Khobar, Kingdom of Saudi Arabia (KSA), during the period January 2000 through to February 2001, whereby 50 patients (34 females and 16 females) with primary diagnosis of bronchial asthma were consecutively enrolled, their mean age + SD was 38.01 + 9.8 years. Twenty-two subjects who were not suffering from asthma or gastroesophageal reflux (GER) (13 females and 9 males) constituted the control group. A questionnaire was administered to all participants and demographic data; asthma and GER symptoms were obtained. Esophageal manometry was performed, whereby the location, length and resting pressure of the lower esophageal sphincter (LES) were determined, pH catheter was inserted nasogastrically, and ambulatory pH data over 24 hours were co...
World Journal of Gastrointestinal Surgery, 2015
All study participants, or their legal guardian, provided informed written consent prior to study... more All study participants, or their legal guardian, provided informed written consent prior to study enrollment. Conflict-of-interest: Non declareted. Ciftci F and Adulrahman I haven't received fees for serving as a speaker, any of organi zations. Ciftci F and Abdulrahman I haven't received research funding from any of organizations. Ciftci F and Abdulrahman I aren't employee of any of organisations.
Does Helicobacter pylori infection in chronic renal failure increase the risk of gastroduodenal lesions? A prospective study
Saudi journal of gastroenterology : official journal of the Saudi Gastroenterology Association, 2004
Helicobacter pylori (H.pylori) plays an important role in gastroduodenal disease. However, there ... more Helicobacter pylori (H.pylori) plays an important role in gastroduodenal disease. However, there are few data concerning the epidemiology of H.pylori in patients with chronic renal failure and on hemodialysis (HD) treatment. This study is aimed to determine the epidemiology of H.pylori infection in patients with end stage renal disease (ESRD) on Hemodialysis (HD). Ninety-six patients with dyspeptic complaints were included in the study. They were divided into two groups; group one consisted of 46 patients with ESRD on HD and group two (control) of 50 patients without renal disease. All patients were subjected to upper gastrointestinal endoscopies, and gastric biopsies were obtained for histological evidence of H. pylori infection. The mean age of both groups was similar. The prevalence of H.pylori among the two groups was not significantly different (45.7% Vs 48%=p > 0.05). The prevalence of duodenal ulcers was significantly higher in H.pylori positive than in H.pylori negative E...
Drug Design, Development and Therapy, 2015
Diabetes is considered one of the main threats to global public health in this era. It is increas... more Diabetes is considered one of the main threats to global public health in this era. It is increasing rapidly in every part of the world; the prevalence of the disease will grow to the point where 366 million people will be affected by 2030. The prevalence of diabetes mellitus (DM) in the Saudi population is high, and the majority of patients suffer from type 2 DM. Marketed oral antidiabetic drugs have indicated poor tolerability during chronic treatments, and this contributes to the moderately large proportion of type 2 DM patients that remain inadequately managed. Vildagliptin nanospheres were prepared with aminated gelatin using a spray-drying method; narrow particle-size distribution was seen at 445 nm. The angle of repose was found to be θ 33.5°. The nanospheres appeared to be spherical with a smooth surface. The drug content and percentage yield of the nanospheres were found to be 76.2%±4.6% and 83%±2%, respectively. The nanosphere-swell profile was found to be 165%±7%. The pure drug was 100% dissolved in 30 minutes, and the nanosphere formulation took 12 hours to dissolve (97.5%±2%), and followed a Korsmeyer-Peppas kinetic model with an R 2 of 0.9838. The wash-off test of nanospheres found that they exhibited an excellent mucoadhesive property at 86.7% for 8 hours. The stability-study data showed no changes in the physicochemical properties of the nanospheres, and suggested that the nanospheres be stored below room temperature. The amount of vildagliptin retained was 1.6% within 3 hours, and in comparison with the gelatin vildagliptin nanoparticles formulation, the percentage that was retained was much higher (98.2% in 12 hours).
Procedia - Social and Behavioral Sciences, 2014
Outcome After Hyperbaric Oxygen Treatment for Cyclophosphamide-Induced Refractory Hemorrhagic Cystitis
Journal of Urology, 2003
... Auteur(s) / Author(s). KALAYOGLU-BESISIK Sevgl (1) ; SANWARA ABDUL-RAHMAN Ibrahim (1) ; ERER ... more ... Auteur(s) / Author(s). KALAYOGLU-BESISIK Sevgl (1) ; SANWARA ABDUL-RAHMAN Ibrahim (1) ; ERER Burak (1) ; YENEREL Mustafa N. (1) ; SAVRAN OGUZ Fatma (2) ; TUNS Murat (3) ; SARGIN Deniz (1) ; Affiliation(s) du ou des auteurs / Author(s) Affiliation(s). ...
Chemical Engineering and Processing - Process Intensification, 2021
This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
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Papers by Ibrahim Abdulrahman