In this study, NaOH dissolution method was applied to dissolve cellulose fibers which extracted from date palm fronds (type Al-Zahdi) taken from Iraqi gardens. In this process, (NaOH)-solution is brought into contact with the cellulose fibers at low temperature. Experiments were conducted with different concentrations of NaOH (4%, 6%, 8% and12%) weight percent at two cooling bath temperatures (-15 oC) and (-20oC). Maximum cellulose dissolution was 23 wt% which obtained at 8 wt% concentration of NaOH and at cooling bath temperature of -20oC. In order to enhance the cellulose fibers dissolution, the sample was pretreated with Fenton's reagent which consists of hydrogen peroxide (H2O2), oxalic acid (C2H2O4) and ferrous sulfate (FeSO4). This reagent reacts with cellulose fibers and produces free radicals which increase cellulose dissolution. In this work three variables were studied: cooling bath temperature (-15oCand-20oC), NaOH concentration (4%, 6%, 8% and12%) and time of Fenton's reagent treatment (1-48) hrs. The results showed that the best percent of cellulose dissolution was (42 wt %) which occurred at treatment time (24 hours), temperature (-20oC) and NaOH concentration 8%. In another set of experiments urea was added to NaOH solution as a catalyst with proportion (6%NaOH+4% urea) at two temperatures -15 and -20 oC. The results show that the solubility of cellulose increase to 62% for the sample which treated with Fenton's reagent and to 35% for the untreated sample, both values were obtained at -15oC.
Background The escalating global concern over increased body weight in adolescents, coupled with the rising rates of adolescent pregnancy worldwide, presents a significant challenge to healthcare systems. We plan to identify the maternal and neonatal consequences associated with pre-pregnancy overweight in adolescent women. Methods Throughout five years, all singleton adolescent pregnant women with pre-pregnancy self-reported body mass index (BMI) of 18.5– ≤ 29.9 were involved during the first-trimester visit. Two groups were generated: overweight and appropriate-weight (BMI 25–29.9 and 18.5–24.9, respectively). Obstetric and neonatal outcomes were observed prospectively and statistically adjusted for the confounding factors.
... Show MoreSelexipag is an orally selective long-acting prostacyclin receptor agonist, which indicated for the treatment of pulmonary arterial hypertension. It is practically insoluble in water ( class II, according to BCS). This work aims to prepare and optimized Selexipag nanosuspensions to achieve an enhancement in the in vitro dissolution rate. The solvent antisolvent precipitation method was used for the production of nanosuspension, and the effect of formulation parameters (stabilizer type, drug: stabilizer ratio, and use of co-stabilizer) and process parameter (stirring speed) on the particle size and polydispersity index were studied. SLPNS prepared with Soluplus® as amain stabilizer (F15) showed the smallest particle size 47nm wi
... Show MoreFlexible pavement design and analysis were carried out in the past with semi-experimental methods, using elastic characteristics of pavement layers. Due to the complex interferences between various layers and their time consumption, the traditional pavement analysis, and design methods were replaced with fast and powerful methods including the Finite Element Method (FEM) and the Discrete Element Method (DEM). FEM requires less computational power and is more appropriate for continuous environments. In this study, flexible pavement consisting of 5 layers (surface, binder, base, subbase, and subgrade) had been analyzed using FEM. The ABAQUS (6.14-2) software had been utilized to investigate the influence of the base layer depth on ver
... Show Moreان التطور التكنولوجي في عناصر انتاج الصورة المسرحية يرتبط بعدة مفردات يتم توظيفها في رسم المنظر المسرحي والذي يرتبط بالمكان مباشرة ، اذ ان الية اشتغال السينوغرافيا في مسرح الطفل تتشكل عبر منظومة الضوء بأجهزتها المختلفة ومؤثراتها الصورية وتقنياتها المتقدمة، اذ يمكن ان يشكل الحضور الكمي والنوعي لتلك المفردتين مسبوقتين بمعرفة فنية تسمح بتحديد فنية التزامن وفنية التركيب، اي بمعنى ان كل قطعة ديكورية يجب ا
... Show MoreThe theater has made a qualitative transition at the level of presenting shows by starting from new theatrical spaces and activating the role of formative values through the mass distribution of the elements of creating the scene and granting visual techniques more functions to enhance the theatrical space and create a partnership between the show and the recipient through the actor's performance. The theater director sought to activate the participatory space through the directorial variables and the text of the show and the use of new techniques and the production of participatory spaces and moving towards new spaces and discovering them and leaving traditional spaces. According to the above, the researchers asked (Does the participatory
... Show Moreامتازت النصوص المسرحية بما تحمله من قيم تربوية ورؤى فنية في المسرحية التعليمية من مضامين فكرية واضحة، وأن المسرحية التعليمية ليست محصورة فقط في الحاضر، بل إنها تعمل على استعراض وتوثيق التاريخ والتراث، وتقديمها بشكل يجعلها ملائمة ومثيرة للاهتمام للأجيال الجديدة، ولأنها تلعب دورًا مهمًا في نقل القيم والمعارف وتعزيز التواصل الثقافي بين الماضي والحاضر والمستقبل، وهي وسيلة فعّالة لتعليم الجمهور بطريقة تف
... Show MoreDiabetic retinopathy is an eye disease in diabetic patients due to damage to the small blood vessels in the retina due to high and low blood sugar levels. Accurate detection and classification of Diabetic Retinopathy is an important task in computer-aided diagnosis, especially when planning for diabetic retinopathy surgery. Therefore, this study aims to design an automated model based on deep learning, which helps ophthalmologists detect and classify diabetic retinopathy severity through fundus images. In this work, a deep convolutional neural network (CNN) with transfer learning and fine tunes has been proposed by using pre-trained networks known as Residual Network-50 (ResNet-50). The overall framework of the proposed
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