Islamic University of Gaza
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Two-Year Non-Destructive Evaluation of Eco-Efficient Concrete at Ambient Temperature and after Freeze-Thaw Cycles
No full textThe increasing demand for eco-efficient concrete puts pressure on the industry to innovate new alternatives for its constituent materials. Coarse recycled concrete aggregates (RA) and supplementary cementitious materials (SCMs) are considered promising substitutes for coarse natural aggregates (NA) and cement, respectively. Using destructive and non-destructive testing methods, the present work aims to evaluate the effect of RA and different types of waste SCMs on the long-term performance of self-compacting high-performance concrete (SCHPC). Twenty-one mixes that were prepared with a 0.35 water-to-binder ratio were tested for their compressive strength, surface hardness, and ultrasonic pulse velocity. These tests were conducted over a two-year period at ambient temperature and again after exposure to up to 150 freeze–thaw cycles. Study findings demonstrated the possibility of developing eco-efficient SCHPC mixes using RA and waste SCMs. In addition, correlations have been introduced for predicting the compressive strength of SCHPC.The increasing demand for eco-efficient concrete puts pressure on the industry to innovate new alternatives for its constituent materials. Coarse recycled concrete aggregates (RA) and supplementary cementitious materials (SCMs) are considered promising substitutes for coarse natural aggregates (NA) and cement, respectively. Using destructive and non-destructive testing methods, the present work aims to evaluate the effect of RA and different types of waste SCMs on the long-term performance of self-compacting high-performance concrete (SCHPC). Twenty-one mixes that were prepared with a 0.35 water-to-binder ratio were tested for their compressive strength, surface hardness, and ultrasonic pulse velocity. These tests were conducted over a two-year period at ambient temperature and again after exposure to up to 150 freeze–thaw cycles. Study findings demonstrated the possibility of developing eco-efficient SCHPC mixes using RA and waste SCMs. In addition, correlations have been introduced for predicting the compressive strength of SCHPC
Flexural behavior of RC beams strengthened with steel wire mesh and self-compacting concrete jacketing — experimental investigation and test results
No full textStrengthening of reinforced concrete (RC) beams with Self-compacting concrete (SCC) jacketing reinforced with galvanized welded steel wire mesh (SWM) is one of the latest retrofitting applied techniques. Eighteen small-scale RC beam specimens with all over a length of 1200 mm for each specimen are experimentally assessed to study flexural strength under static loading conditions. Experimental tests have been performed until failure mode on, eleven strengthened samples, four control beams poured monolithically, and three original control beam. The eleven specimens are strengthened using the U-jacketing technique in which a relatively thin reinforced SCC layer is applied for the bottom width and both vertical sides of the original beams. The strengthened beams are categorized into two groups A and B based on test variables, namely, the SWM properties and the bonding mechanism. In this study, the flexural capacity, ductility, stiffness, crack width and deflection are also clarified. Based on achieved test results, all strengthened beams are designed to fail in a ductile manner. The first group of strengthened beams restored on average 110% of the original control beams load capacity, whereas the second strengthened group resorted to 163% on average. Moreover, it is found that the strengthened beams acted in the same manner of the monolithic control beams and acted as a single unit. Accordingly, it is concluded that this strengthening technique can be used confidently in real-life applications, especially for low-priced constructions.Strengthening of reinforced concrete (RC) beams with Self-compacting concrete (SCC) jacketing reinforced with galvanized welded steel wire mesh (SWM) is one of the latest retrofitting applied techniques. Eighteen small-scale RC beam specimens with all over a length of 1200 mm for each specimen are experimentally assessed to study flexural strength under static loading conditions. Experimental tests have been performed until failure mode on, eleven strengthened samples, four control beams poured monolithically, and three original control beam. The eleven specimens are strengthened using the U-jacketing technique in which a relatively thin reinforced SCC layer is applied for the bottom width and both vertical sides of the original beams. The strengthened beams are categorized into two groups A and B based on test variables, namely, the SWM properties and the bonding mechanism. In this study, the flexural capacity, ductility, stiffness, crack width and deflection are also clarified. Based on achieved test results, all strengthened beams are designed to fail in a ductile manner. The first group of strengthened beams restored on average 110% of the original control beams load capacity, whereas the second strengthened group resorted to 163% on average. Moreover, it is found that the strengthened beams acted in the same manner of the monolithic control beams and acted as a single unit. Accordingly, it is concluded that this strengthening technique can be used confidently in real-life applications, especially for low-priced constructions
Mechanical properties of semi-lightweight concrete containing nano-palm oil clinker powder
No full textThe traditional materials used in concrete will run out some day. Therefore, waste materials can be used as an alternative material in concrete production. Palm oil clinker (POC) is one of these wastes. A new method to improve the performance of waste material characteristics is to treat and grind the waste materials to achieve nano-particle size. This study focused on the improvement of concrete strength by using different proportions of nano-palm oil clinker powder (NPOCP) as cement replacement, with a full replacement of POC as the coarse aggregate. Numerous replacement levels for cement have been conducted using NPOCP with 0% as the control mix and 10%, 20%, 30% and 40% of the total binder weight to test slump, density and compressive strength. Results illustrated that the workability of semi-lightweight aggregate concrete (semi-LWAC) increases along with the increase of NPOCP content. Density also decreases along with the increase of NPOCP in the concrete mix. Moreover, the NPOCP with 40% as replacement level has the lowest compressive strength value among all other mixtures, and the 10% replacement level has the highest compressive strength of 39 MPa.The traditional materials used in concrete will run out some day. Therefore, waste materials can be used as an alternative material in concrete production. Palm oil clinker (POC) is one of these wastes. A new method to improve the performance of waste material characteristics is to treat and grind the waste materials to achieve nano-particle size. This study focused on the improvement of concrete strength by using different proportions of nano-palm oil clinker powder (NPOCP) as cement replacement, with a full replacement of POC as the coarse aggregate. Numerous replacement levels for cement have been conducted using NPOCP with 0% as the control mix and 10%, 20%, 30% and 40% of the total binder weight to test slump, density and compressive strength. Results illustrated that the workability of semi-lightweight aggregate concrete (semi-LWAC) increases along with the increase of NPOCP content. Density also decreases along with the increase of NPOCP in the concrete mix. Moreover, the NPOCP with 40% as replacement level has the lowest compressive strength value among all other mixtures, and the 10% replacement level has the highest compressive strength of 39 MPa
بيتافاستاتين والسرطان: الآفاق الحالية والمستقبلية
No full textPitavastatin is a synthetic 3-hydroxy-3-methyl glutaryl coenzyme A reductase inhibitor, which was approved for the primary treatment of hypercholesterolemia and combined dyslipidemia since 2009. Today, in vitro and in vivo studies have shown pitavastatin as a potentially effective therapeutic agent for different cancers, including; liver, ovarian, breast, skin, and intestinal cancers. These studies have evaluated pitavastatin both as a single treatment and in combination with other therapeutic options. This chapter focuses on the potential anti-cancer effects of pitavastatin, including its mechanism of action as well as the potential adverse reactions linked to its clinical use.Pitavastatin is a synthetic 3-hydroxy-3-methyl glutaryl coenzyme A reductase inhibitor, which was approved for the primary treatment of hypercholesterolemia and combined dyslipidemia since 2009. Today, in vitro and in vivo studies have shown pitavastatin as a potentially effective therapeutic agent for different cancers, including; liver, ovarian, breast, skin, and intestinal cancers. These studies have evaluated pitavastatin both as a single treatment and in combination with other therapeutic options. This chapter focuses on the potential anti-cancer effects of pitavastatin, including its mechanism of action as well as the potential adverse reactions linked to its clinical use
Cognitive behavior therapy for low self esteem randomized controlled trial in a psychiatric hospital in Gaza Strip
No full textBackground: Substance use disorders (SUDs) are a serious threat to health and society; Focusing on improving the self-esteem of substance users through the Cognitive Behavioral Therapy (CBT) program is an important factor in addiction treatment.
Objectives: The study aims to evaluate the effectiveness of CBT in improving self-esteem among patients with SUBs in the Gaza Strip.
Methods: The experimental design was used, 30 male Participants were divided randomly into two groups: experimental and control (n = 15) per group. Both groups received the standard treatment, while only the experimental group underwent the CBT program consisting of (16) sessions over 2 months. All of the subjects completed a self-esteem questionnaire before and after the intervention, and 2 months later (follow-up). The required data were collected and analyzed.
Results: a statistically significant difference between the two groups in favor of the experimental group in the level of self-esteem was found. There are statistically significant differences between the mean scores of the experimental group regarding the post and follow-up measurements on the self-esteem scale after 2 months, p < .05 in self-esteem in posttest and follow-up measurement. Results indicated that CBT was effective in improving self-esteem among patients with SUDs.
Conclusions: The study concludes that CBT sessions have been effective and successful in improving self-esteem among patients with SUD.Background: Substance use disorders (SUDs) are a serious threat to health and society; Focusing on improving the self-esteem of substance users through the Cognitive Behavioral Therapy (CBT) program is an important factor in addiction treatment.
Objectives: The study aims to evaluate the effectiveness of CBT in improving self-esteem among patients with SUBs in the Gaza Strip.
Methods: The experimental design was used, 30 male Participants were divided randomly into two groups: experimental and control (n = 15) per group. Both groups received the standard treatment, while only the experimental group underwent the CBT program consisting of (16) sessions over 2 months. All of the subjects completed a self-esteem questionnaire before and after the intervention, and 2 months later (follow-up). The required data were collected and analyzed.
Results: a statistically significant difference between the two groups in favor of the experimental group in the level of self-esteem was found. There are statistically significant differences between the mean scores of the experimental group regarding the post and follow-up measurements on the self-esteem scale after 2 months, p < .05 in self-esteem in posttest and follow-up measurement. Results indicated that CBT was effective in improving self-esteem among patients with SUDs.
Conclusions: The study concludes that CBT sessions have been effective and successful in improving self-esteem among patients with SUD
Intestinal Parasites in Relation to Haemoglobin Level and Nutritional Status of School Children in Gaza, Journal of the Egyptian Society of parasitology
No full textThe prevalence of intestinal paresite and their relations to anemia and nutritional status among school children aged 6-11 years in Gaza was studied. The target area is overcrowded with improper sewage disposal system and low socioeconomic levels. Anaemia was assessed by haemoglobin level ( Hb and nutritional status by anthropometric measurements includind weight for age ( WA , weight for height ( WH and height for age ( HA . Intestinal parasites were found to be prevalent in Gaza. The overall prevalence was 24.5%. Giardia lamblia ( 62.2% was the most common parasite detected particularly in age group 6-7 years. followed by Ascaris lumbricoides ( 20.0% , then Entamoeba histolytica ( 18.0% . Parasitosis was generally declining with older age groups for both sexes. In general, the prevalence of anaemia was more common in the younger children. Malnutrition was found to be prevalent among children. Infected children of age group 8-9 years showed higher incidence of low WA than non infected ones. The prevalence of stunting and wasting among infected children of the youngest group was greater than that observed for controls. Regarding sex, no specific trend that relates the prevalence of anaemia with sex. Malnutrition was more prevalent among females than males
Toxoplasmosis Among Pregnant and Non-Pregnant Women Attending Al-Shifa Hospital In Gaza Strip, Palestine
Full text linkThe aim our work is to study the occurrence of toxoplasmosis among pregnant and nonpregnant in Gaza strip. In cross-sectional study 164 sample was collected from pregnant and non pregnant woman attending Al-shifa hospital. Quantitative investigation of each blood sample for the levels of the specific IgG and IgM of T.gondii was done for collected sample.
The overall prevalence of Toxoplasma IgG was found 33.2% and Toxoplasma. IgM was found to be 21%. The highest rate of IgG ( 47.4% was in age group from 35-45 years old and IgM was ( 40% in age group 25 to 35 years old. The women residing in the East Gaza city had IgG ( 42.2% but in IgM was ( 32.1% in the women residing in the North and Midzone. The highest rate of IgG ( 57.1% and IgM ( 42.9% were noticed among the employed women. In conclusion the result of this study shows a significant high seroprevalence of toxoplasmosis infection in pregnant women, and an important association with different socioeconomic factors. It is recommended that Toxoplasma gondii should applied as a routine test in Gaza and further studies to determine the reality of the definitive host infection ( cats in Gaza
A survey on the knowledge and attitudes among the students of Al-Azhar University to HIV/AIDS, the Gaza Strip-Palestine
Full text linkObjective: The study assessed the knowledge and attitudes of students’ at a university in Gaza regarding HIV/AIDS and identified differences in knowledge about HIV, and attitudes by gender, locality, and social and economic status. Methods: This descriptive study targeted 492 students of Al-Azhar University-Gaza. The participants completed self-administered questionnaires that included the following dimensions: sociodemographic,measurements of student's knowledge level and measurement of student's attitudes towards HIV/AIDS. Results: Findings showed moderate level of knowledge regarding HIV/AIDS although there was a very low of perception regarding the acceptance and sharing of HIV/AIDS persons. It means that only one third of the study respondents are willingness to be in close touch with people living with HIV or even communication with them, and less than fifty percent thought that it is their right to be engaged in a public or governmental job, stigma and discriminatory attitudes toward HIV/AIDS persons is high only 48% of the students thought it right to employ
people living with HIV ( PLHIV and 35.5% refused to work in the same place with PLHIV. Conclusion: This study indicates the need for improving the level of knowledge as well as promoting the students' towards positive attitude
