Islamic University of Gaza
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Effect of elevated temperatures on mechanical properties of lightweight geopolymer concrete
No full textThis study aims to examine the effect of high temperatures on lightweight geopolymer concrete (LWGC) and lightweight ordinary concrete (LWOC) made of natural pumice and lightweight expanded clay aggregate (LECA) with the addition of trapped air. To this end, a geopolymer concrete matrix has been synthesized by the alkali-activation of fly ash (FA) and granulated blast furnace slag (GBFS). The geopolymer concrete samples were cured for 24 h at a temperature of 80 °C. To study the properties of fresh concrete, slump and slump flow tests and unit weight were applied. The mechanical properties were also measured by the compressive strength, splitting tensile, flexural strength, and elastic modulus tests. High temperatures of 100 °C, 200 °C, 300 °C, 400 °C, 500 °C, 600 °C, 700 °C, and 800 °C were applied on the geopolymer concrete samples to obtain the residual compressive strength. In general, pumice and LECA can be used as an alternative to the dolomite aggregate to produce LWGC and LWOC. The mixture F-50D50P-A achieved the lowest of unit weight of 1660 kg/m, a slump flow of 555 mm, and compressive strength of 32.9 MPa at 91-days. Lightweight geopolymer concrete containing 50 % fly ash and 50 % GBSF achieved the best compressive strength test results. The results showed a similarity in the behaviour of LWGC with LWOC under the influence of all the variables applied in this study.This study aims to examine the effect of high temperatures on lightweight geopolymer concrete (LWGC) and lightweight ordinary concrete (LWOC) made of natural pumice and lightweight expanded clay aggregate (LECA) with the addition of trapped air. To this end, a geopolymer concrete matrix has been synthesized by the alkali-activation of fly ash (FA) and granulated blast furnace slag (GBFS). The geopolymer concrete samples were cured for 24 h at a temperature of 80 °C. To study the properties of fresh concrete, slump and slump flow tests and unit weight were applied. The mechanical properties were also measured by the compressive strength, splitting tensile, flexural strength, and elastic modulus tests. High temperatures of 100 °C, 200 °C, 300 °C, 400 °C, 500 °C, 600 °C, 700 °C, and 800 °C were applied on the geopolymer concrete samples to obtain the residual compressive strength. In general, pumice and LECA can be used as an alternative to the dolomite aggregate to produce LWGC and LWOC. The mixture F-50D50P-A achieved the lowest of unit weight of 1660 kg/m, a slump flow of 555 mm, and compressive strength of 32.9 MPa at 91-days. Lightweight geopolymer concrete containing 50 % fly ash and 50 % GBSF achieved the best compressive strength test results. The results showed a similarity in the behaviour of LWGC with LWOC under the influence of all the variables applied in this study
Engineering properties of sustainable green concrete incorporating eco-friendly aggregate of crumb rubber: A review.
No full textThe disposal of waste rubber tires has become a main ecological issue around the world. Each year, millions of tires are disposed of, buried, or thrown away, which is a severe hazard for the environment due to its prolonged degrading period. Therefore, recycling waste rubber as aggregates as a supplemental construction material is beneficial. The usage of crumbs rubber (CR) would be led to sustainable utilization of waste material, which would preserve depleting natural aggregate sources and protecting the environment. This paper reviews the published research on the performance of concrete containing CR as eco-friendly aggregates. Moreover, it highlights the impact in terms of aggregate substitution content, form, size, and waste treatment on the fresh and mechanical properties of crumb rubber concrete (CRC). The paper also aims to update the database for further experimental and numerical research on rubberized concrete.The disposal of waste rubber tires has become a main ecological issue around the world. Each year, millions of tires are disposed of, buried, or thrown away, which is a severe hazard for the environment due to its prolonged degrading period. Therefore, recycling waste rubber as aggregates as a supplemental construction material is beneficial. The usage of crumbs rubber (CR) would be led to sustainable utilization of waste material, which would preserve depleting natural aggregate sources and protecting the environment. This paper reviews the published research on the performance of concrete containing CR as eco-friendly aggregates. Moreover, it highlights the impact in terms of aggregate substitution content, form, size, and waste treatment on the fresh and mechanical properties of crumb rubber concrete (CRC). The paper also aims to update the database for further experimental and numerical research on rubberized concrete
دور الدعاة في تجويد أثر الرعاية التلطيفية
Full text linkThis study aimed to demonstrate the positive impact of alddaeiat in improving the effect of palliative care in the lives of relevant members of society. Therefore, it exposed the study to define the alddaeia, and the Palliative Care, with an explanation of the relationship between them. Then, it explained the qualities of the influential alddaeia in improving the impact of palliative care, Then, it discusses its impact on improving the output of palliative care, by following the inductive approach and analytical descriptive, and deductive. Then, the study concluded should be alddaeiat have a responsibility to improve the impact of palliative care with the improvement of the religious speech to patients, by selecting the texts that affect them, with guiding a direct relationship to patience and endurance, to obtain reward from God Almighty.هدفت هذه الدراسة إلى بيان الدور الإيجابي للدعاة في تجويد أثر الرعاية التلطيفية في حياة ذوي العلاقة من أفراد المجتمع، بحيث تعرضت الدراسة لتعريف مصطلحي الداعية، والرعاية التلطيفية، مع بيان طبيعة العلاقة بينهما، ثم عرجت إلى صفات الداعية المؤثرة في تجويد أثر الرعاية التلطيفية، ثم الحديث عن دوره في تحسين مخرجات الرعاية التلطيفية، وذلك باتباع المنهج: الاستقرائي، والوصفي، والتحليلي، والاستنباطي. ثم خلصت الدراسة إلى وجوب تحمل الدعاة المسؤولية في تجويد أثر الرعاية التلطيفي، مع تجويد الخطاب الدعوي الموجه إلى المرضى؛ بانتقاء النصوص المؤثرة فيهم، مع توجيه ذوي العلاقة إلى الصبر والاحتمال، لنيل الأجر من الله تعالى
Is Gaza Sandy Shoreline Region Contaminated with Human Gastrointestinal Parasites?
No full textThe study was implemented to test if the sandy shoreline of Gaza city is contaminated with human gastrointestinal parasites or not and to determine the types of intestinal parasites and the extent of contamination. A total of 104 s and samples (52 dry sand and 52 wet sand) were analyzed during the summer season period. Samples were collected from the study area of about 12km along the seashore region of Gaza City. Dry samples and wet sand samples were analyzed using water-sedimentation technique and a light microscope. The results showed that the percentage of the parasitic contamination was 40.4% of the wet sand samples and 34.6% of the dry sand samples along the shoreline region of the Gaza City. The human gastrointestinal parasites detected were the following: Ascaris lumbricoides, S. stercoralis, E. vermicularis, E. histolytica/dispar, G. lamblia, E. coli and Taenia. spp. The findings showed that there was no statistically significant difference in the concentration of parasitic contamination between the dry and wet sand samples at confidence level of p-value < 0.05. It is recommended to conduct a periodical routine sampling of sand at the swash zone because the results of this study showed that the wet and the dry sand may pose a high level of health risk. Residents should be informed clearly by posting signs indicating polluted areas to keep them safe
تحديد الانتشار المصلي لداء المقوسات بين النساء المجهضات في غزة
No full textAims: The microbial pathogen Toxoplasma gondii is commonly associated with congenital infections that are not clinically apparent. Primary T. gondii infection in the first trimester pregnancy may cause severe congenital anomalies or even foetal loss. The present study is aimed to determine the seroprevalence of toxoplasmosis among aborted women in Gaza, to study the relationship between animal rearing and the presence of Toxoplasmosis and to assess the relation of some abnormalities and infection with Toxoplasmosis.
Materials and Methods: A hospital-based study was implemented to detect, describe and analyze toxoplasmosis among women with abortion attending Al-shifa hospital in Gaza strip. Quantitative investigation of each blood sample for the levels of the specific IgG and IgM of T.gondii was done from 312 aborted women.
Results: The overall prevalence of Toxoplasma IgG was found 17.9% and Toxoplasma IgM was found to be 12.8%. The age of the participant woman ranged from 16 to 45 years old; 216 came from Gaza city (69.2%) and the others reside in near villages 96 (30.8%). Most of the participants (59.0%) had secondary education level. Animal breading was reported for 33.3% of the aborted women.
Conclusions: Toxoplasmosis still exists and considered one of the risk factors for pregnancy miscarriage. Both IgG and IgM tests are recommended as routine tests among pregnant women in Gaza.هدفت الدراسة الحالية الى تحديد الانتشار المصلي لداء المقوسات بين النساء المجهضات في غزة. و دراسة العلاقة بين تربية الحيوانات ووجدود المرض وتقييم العلاقة لبعض الحالات غير الطبيعية والاصابة بداء المقوسات. طبقت الدراسة في المستشفى للكشف ووصف وتحليل داء المقوسات بين النساء المجهضات الذيت يترددن على مستشفىالشفاء في قطاع غزة. و قد تم اجراء فحص كمي لكل عينة دم لقياس مستويات محددة لكل من أضداد الغلوبين المناعي G و M من 312 امرأة مجهضة. و قد أظهرت النتئج أن معدل انتشار أضداد من الغلوبولينات بين 16-45 سنة. وجدت الدارسة أن 69.2% من النساء يقطن مدينة غزة, بينما 30.8% من المشاركات يقطن القرى القريبة. كذلك بينت الدراسة ان معظم المشاركات 59.0% تلقوا التعليم الثانوي. سجلت تربية الحيوانات 33.3% من النساء المجهضات. تدل نتائج هذه الدراسة أن داء المقوسات لا يزال موجودا و يعتبر أحد عوامل الخطر المسببة للاجهاض. أوصت الدارسة بأن يعتبر فحص الغلوبولينات المناعية G و M كأحد الفحوصات الروتينية للنساء الحوامل في غزة
Histopathological study of Enterobius vermicularis among appendicitis patients in Gaza strip, Palestine
No full textEnterobius vermicularis is one of the most common intestinal parasite in human. The main objective of this study is to determine the role of E. vermicularis in appendicitis through histopathological examination. A cross sectional study included 200 patients who had appendectomy from three hospitals in Gaza strip. The inflamed appendix was the cause of attending the hospital. Histopathological examination for each appendix was carried out. A questionnaire was designed (interview with
patients who underwent appendectomy), and information were obtained from patient and analyzed by using SPSS.
The study showed that 30 (15.0 %) of 200 appendices had E. vermicularis in histopathological examination. It was found that ages of patients with histologically proven E. vermicularis in appendices less than 18 years old was found to be (18.2 %). Regarding sex, (16.5 %) of females, (14.0 %) of males patients had E. vermicularis in appendices. Patients who had the highest infection with E. vermicularis were students (17.3 %). In conclusion E. vermicularis occurs more frequently inflamed appendices than in normal. From these results we can conclude that E.vermicularis could be associated to cause of appendicitis inGaza strip
Gastrointestinal Parasites of the Roucktail Rock Agama, Laudakia stellio from Gaza Strip, Palestine
No full textPalestine is located to the east of the Mediterranean Sea between 29 and 33 North latitude 35 and 39 longitude, the West
Bank and Gaza Strip are two regions in Palestine. Parasitological examination of the gastrointestinal tract of 67 roucktail
rock agamas (Laudakia stellio) from the Gaza Strip, Palestine recovered 2 species of nematodes, Parapharyngodon
bulbosus and Strongyluris calotis, 1 species of cestode Oochoristica tuberculata and 1 species of ciliated protozoan,
Nyctotherus hardwickii. Prevalence of P. bulbosus was (100 %), S. calotis (67 %), O. tuberculata (78 %) and N. hardwickii
(90 %). Mean intensity ± SD and ranges were P. bulbosus 40.5 ± 24.2, (1-115 ), S. calotis 34.3 ± 21.6, ( 0-74 ); O.
tuberculata 1.5 ± 0.5, ( 0-2 ). Nyctotherus hardwickii and O. tuberculata are reported for the first time from the Gaza Strip,
Palestine
Mother knowledge, attitudes, perception regarding intestinal parasites and diarrhoea in three regions of Gaza strip, Palestine
No full textThe knowledge, attitudes and practice (KAP) among mothers towards intestinal parasites and diarhoea in three regions in Gaza strip were studied. A total of 659 mothers of children attended a primary health care centre (PHCC) for medical services were selected. Data were obtained through self administered questionnaire which distributed to each mother attending the PHCC. The questionnaire included some sociodemographic, economical information and implemented in year 2006. In the present study age group ranged between 15 and more than 35 years. It was found that children belonging to mothers in the age groups 15-25 years and > 35 years old were found infected with intestinal parasites and diarrhea and had similar prevalences (37.3 & 37.1%). Mother education had a positive effect for the decreasing of parasitosis among children. The variation in the prevalence of intestinal parasites due to region was noted where the south of Gaza Strip had the high prevalence (40.6%) with a significant difference (p = 0.004). Children living in houses with sandy yards was infected with intestinal parasites more those living in houses with tiles (p = .02)