Israa University Journal for Applied Science最新文献

{"title":"Improvement of Steam Power Plants Performance Using a Heat Exchanger","authors":"Mohamed Alnahhal,, M. Elnaggar, M. Ghazal","doi":"10.52865/wxks1395","DOIUrl":"https://doi.org/10.52865/wxks1395","url":null,"abstract":"The present work focuses on the improvement of the ideal Rankine cycle performance used in steam power plants. Improving the steam power plant efficiency, or its components performance is desirable where the absence of renewable energy power conversion systems and the shortage of conventional fuels sources take place. The present work studies the possibility of using a counter flow heat exchanger along with the main components of the ideal Rankine cycle. The proposed counter flow heat exchanger will include the flow of compressed liquid exiting the pump and the flow of superheated steam exiting the steam turbine. The advantages of the proposed system which is investigated here include extracting heat through the heat exchanger which can be added to boiler for superheated steam production and thus reduce the amount fuel needed. In addition, since the proposed system assumes a superheated steam at the exit of the steam turbine, so no moisture is expected to form and thus increased effeciency of the steam turbine will be expected. The presents results show that the amount of heat extracted through the proposed heat exchanger for diffrent systematic four test cases of differet exits' temperatures of steam turbines and heat exchanger is systematically increasing when the those temperatures are decreasing suggesting the advantage of the proposed heat exchanger. In addition, however the proposed system eliminated the presence of moisture at the steam turbine which improve the performance of the steam turbine, a systematic reduction reduction in the delivered work by the steam turbine","PeriodicalId":223912,"journal":{"name":"Israa University Journal for Applied Science","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132796518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Activity of HYPR surfactant as Superplasticizer on the properties of concrete mixes","authors":"Abdel Fattah A. Qaraman","doi":"10.52865/ndcg2490","DOIUrl":"https://doi.org/10.52865/ndcg2490","url":null,"abstract":"Superplasticizers are a basic component in a today concretes, enhancing workability, which leads to producing durable and sustainable concrete. This research aims to study the effect of Alkyl dimethyl hydroxyl ethyl ammonium chloride (HYPR) cationic surfactant as superplasticizer on the properties of concrete to produce concrete with suitable workability. The mechanical properties concrete mixes first obtained for control mix, then for different concentration of HYPR that added to the concrete, 0.10, 0.25, 0.50 and 0.75% by cement weight. The slump tests, air content, compressive strength tests , microstructure and morphology of the hardened concrete were conducted for all specimens with and without HYPR. The results indicate that using HYPR admixture at their best ratios in the concrete mixes would improve the slump loss from 70 mm to 230 mm. The use of HYPR admixture showed an adverse effect on compressive strength. The scanning electron microscope (SEM) illustrates that the addition of HYPR on concrete produces consistent bubble structure with a uniform small air voids system (80.41 µm).","PeriodicalId":223912,"journal":{"name":"Israa University Journal for Applied Science","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132059367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Attitudes of Obese Women Toward Group Therapy as A method of Increasing Compliance with Therapeutic Program in Gaza Strip, Palestine","authors":"Mahmoud Al-Shaikh Ali","doi":"10.52865/xxyj6273","DOIUrl":"https://doi.org/10.52865/xxyj6273","url":null,"abstract":"This study aimed to examine the attitudes of overweight and obese women toward a group therapy in Gaza Strip, and to identify if they prefer group therapy and willing to continue participation in group therapy. The sample of the study consisted of 1004 overweight and obese women who are registered at Ibn El Nafees Center for weight reduction from July 2016 to June 2017. The researcher used descriptive, cross-sectional design, and for data collection constructed selfadministered questionnaire was used and prepared by the researcher, and validity and reliability of the questionnaire were tested by a pilot study on 50 participants. The results showed that about half of the study participants were from age group 26 – 45 years, and mean age was 34.43 years, and 87.5% had BMI of ≥ 30. The results also indicated that obese women have positive attitudes towards group therapy with weighted percentage of 84%. Furthermore, the vast majority of obese women (93.1%) preferred group therapy and willing to continue participation in group therapy during their therapeutic program. In addition, women aged 36 – 45 years preferred group therapy compared to women from other age groups, and are willing to continue participation in group therapy, while women aged 46 years and more had higher positive attitudes toward group therapy. Also, there were no significant differences in preference of group therapy and willingness to continue in group therapy related to marital status. Moreover, women who were working preferred group therapy, willing to continue participating in group therapy, and had more positive attitudes toward group therapy. The study concluded that group therapy could be an integrated approach in addition to individualized treatment that may enhance compliance to therapeutic program for weight reduction and control.","PeriodicalId":223912,"journal":{"name":"Israa University Journal for Applied Science","volume":"139 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128254624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improving Solar Power System's Efficiency Using Artificial Neural Network","authors":"M. Alfarra, H. Elaydi","doi":"10.52865/rffg5440","DOIUrl":"https://doi.org/10.52865/rffg5440","url":null,"abstract":"Renewable energy sources are the best solution to reduce dependence on conventional and nonrenewable sources that also cause environmental pollution. With the increase in the prices of conventional fuels globally, the increase of gas emissions resulting from its use, and the impact on the environment and the global climate; various renewable energy sources have emerged as an alternative to traditional sources of energy. Ssolar energy is one of the most important renewable energy sources used globally; The technology used is relatively simple and uncomplicated, compared to the technology used in other renewable energy sources. Solar energy is the ideal alternative to conventional energy in the Gaza Strip in Palestine, due to the relatively high solar radiation in the region, which makes its application more practical and economical compared to other parts of the world. Palestine has higher rates of total solar absorption, ranging from 4-8 kWh / m2 per day, which is high compared to other countries. This paper offers a solution to the Gaza Strip, which has suffered from a severe power shortage due to the Israeli blockade, by using solar PV as a backup system and a good alternative to diesel generators. Photovoltaic cells convert the sunlight into DC electric power. Where the major problem of the PV is that with the changing of atmospheric conditions, the voltage is changing, and so the maximum power is changing. We know that PV systems are still very expensive; therefore, the Artificial Neural Network controller is designed for the converter to secure the maximum power to the system to increase the efficiency of it. ANN controller is designed to bring out the maximum power from the solar panel. This paper uses a controller that utilizes MPPT technique to increase the efficiency of converting solar energy into electrical energy by modifying the duty cycle of Puls Width Modulation (PWM) for the boost converter to obtain the MPP energy from solar cells at all times. A solar panel applied and their components are individually modeled in the MATLAB / SIMULINK program to simulate a real PV system behavior, then an MPPT technique, including DC/DC boost converter was designed. Then an ANN controller is designed and then trained to get the maximum power 65 point from the solar panel at different atmospheric conditions. Also, this controller is compared with the direct connected method without an MPPT controller. The system performance is measured by changing solar radiation and temperature of the PV module. The findings indicate that MPPT ANN has a fast response to the variability and is more efficient, which means more power transfer to the system. The outcome shows that the photovoltaic module directly associated without MPPT technique has less efficiency because of the mismatch between the photovoltaic module and the load.","PeriodicalId":223912,"journal":{"name":"Israa University Journal for Applied Science","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114836866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of Indoor Air Quality at Engineering Campus Library at the University Sains Malaysia","authors":"Maher Elbayoum,, N. Ramli, N. F. M. Md Yusof, Norrimi Rosaida Awang, N. S. Zainordin, Maisarah Sulaiman, S. Shith, Teh Nur Amalina Zaki","doi":"10.52865/nvhy1702","DOIUrl":"https://doi.org/10.52865/nvhy1702","url":null,"abstract":"The indoor air quality (IAQ) in micro-environments is extremely important due to its impact on health and productivity of students. This study presents the findings of indoor air quality (IAQ) investigations in engineering campus library at the University Sains Malaysia. Four levels of the library were investigated during May 2015. Measurements were carried out by using electrochemical analyzer and hand-held particulate matter (PM) instrument. The results showed that Formaldehyde, carbon monoxide (CO), Ozone, and total volatile organic compounds (TVOC) levels were found below Malaysian guideline values. Temperature ranged between 18.9–28.4 °C and relative humidity (RH) ranged between 49%–73% with an average of 62.2%. The indoor concentration PM2.5 level was 5.73±4.93μg/m3. All the monitoring pollutants’ levels were found below Malaysian guideline values in the ground floor, and the 1st and 2nd floors. However, several exceedances occurred in the 3rd floor. Inadequate introduction and/or distribution of fresh air may be the main problem in the left side of the building and in the 3rd floor. Thus, evaluation of the HVAC (Heating, Ventilation, and Air Conditioning) system should be examined","PeriodicalId":223912,"journal":{"name":"Israa University Journal for Applied Science","volume":"195 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128609477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Contribution of Major Factors Affecting Non-Revenue Water to Water Supply Network in Gaza Strip, Palestine","authors":"J. Alkasseh","doi":"10.52865/snmp9081","DOIUrl":"https://doi.org/10.52865/snmp9081","url":null,"abstract":": Water losses occurring in water distribution systems (WDSs) are now considered as a serious problem, necessitating a robust and effective management strategy. Non-revenue water (NRW) data indicate that most cities in Gaza Strip, Palestine experience high NRW. In 2015, the average percentage of NRW in Gaza Strip was 39%. This figure resulted in major financial, supply, and pressure losses, as well as excessive energy consumption. The estimated annual volume of NRW in 2015 was in the order of 34 million m3 which is equivalent to American $ 16 million. Furthermore, NRW is a good indicative of water utility performance; high levels of NRW usually indicate a poorly managed water utility. This paper investigates the reasons why NRW is so high in many cities in Gaza Strip. Results of the study revealed that the lack of incentives for management units, the lack of awareness of citizens-users of the water service, apparent losses, the blockade on Gaza Strip, the wars on Gaza are the main causes.","PeriodicalId":223912,"journal":{"name":"Israa University Journal for Applied Science","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125947768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation the Impact of Using Treated Wastewater for Irrigation on Soil Chemical Properties and Crop Productivity in Gaza Strip","authors":"R. Idais, A. R. Nassar, A. Mughari","doi":"10.52865/syrm9796","DOIUrl":"https://doi.org/10.52865/syrm9796","url":null,"abstract":"The aim of study is to investigate the impact of using treated wastewater for irrigation on soil chemical properties and plant productivity. An reuse pilot study was carried out in Al-Zaitoun agricultural farm in the Gaza Strip from May to September 2011. A comparison was carried out between the soil properties in two experimental plots; one was irrigated with the effluent from Gaza Wastewater Treatment Plant over a period of four months, and the other was irrigated with fresh water from agricultural well in the same period. The crop used was sorghum. Samples of fresh water and treated wastewater were obtained and analyzed for pH, TDS, EC, Na, Cl, TKN, TP, K, BOD, NO3, TSS, FC, Fe, Mn, Zn. Composite soil samples were taken from depth of 0-30 cm in both plots and analyzed for the main chemical parameters. The results indicated that the level of TDS, Na, Cl, TSS, Zn and Fe were higher in the effluent than the fresh water; it was above the recommended Palestinian standard for dry fodder irrigated by treated wastewater. Also, irrigation with wastewater lead to significant increase in O.M%, CEC, K, TP, Ca, Mg, Na, and Cl in soil than irrigation with fresh water. In addition, the increases of Zn, Fe, Mn, and Pb in soil and sorghum plant irrigated with treated wastewater were significant in comparison with the plants irrigated with fresh water. Further, treated wastewater increased the plants height, and grain weight of sorghum.","PeriodicalId":223912,"journal":{"name":"Israa University Journal for Applied Science","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123427994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Prediction of Hourly Indoor Carbon Monoxide Concentrations by Using Multivariate Methods with Sensitivity Analysis Technique","authors":"Maher Elbayoumi, Suheir Elbayoumi Harb","doi":"10.52865/phse9970","DOIUrl":"https://doi.org/10.52865/phse9970","url":null,"abstract":"Precise site prediction of indoor hourly carbon monoxide (CO) concentrations in school buildings is a key issue in air quality research nowadays due to its impact on children’s health. In this study multivariate statistical methods, multiple linear regression (MLR) and principle component analysis (PCA), were employed to predict hourly indoor CO concentration in Gaza Strip, Palestine. Measurements were carried in 12 schools from October 2012 to May 2013 (one academic year). The results suggested that the selected models are effective forecasting tools and hence can be applicable for short-term forecasting of indoor CO level. The predicted indoor CO concentration values agree strongly well with the measured data with high coefficients of determination (R2) 0.869, 0.870 for MLR and PCA-MLR (PCR) respectively. Overall, results showed that PCA model combined with MLR improved MLR model of predicting indoor CO concentration, with reduced errors by as much as 7.14%.","PeriodicalId":223912,"journal":{"name":"Israa University Journal for Applied Science","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128538290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Estimation of Temperature in Aluminum Plasma Using Laser Induced Breakdown Spectroscopy","authors":"S. Mansour","doi":"10.52865/mmvg3776","DOIUrl":"https://doi.org/10.52865/mmvg3776","url":null,"abstract":"Plasma produced by a 1.064 µm pulsed with a pulse duration of 6ns focused onto a pure aluminum solid sample (~99.99%) in air at atmospheric pressure is studied spectroscopy. An Echelle spectrograph coupled with a gate intensified charge coupled detector is used to record the plasma emissions. The plasma temperature was measured by time-resolved spectroscopy of aluminum neutral atom line emissions in the time window of 1-5 µs, using SahaBoltzmann plot method. The aluminum neutral lines were found to suffer from optical thickness over the entire delay times. Analytical relations were used and experimental procedures devised for evaluation of the self-absorption coefficients of several Al-lines, which are important to get reliable temperature measurements. The results shows that Al (I) lines have highest plasma temperature of 1.427 eV before correction against self absorption, while revealed a lowest temperature of 1.092 eV after correction","PeriodicalId":223912,"journal":{"name":"Israa University Journal for Applied Science","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130786956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Land Reclamation using Construction Waste for Offshore Gaza Fishery Port","authors":"Mazen Abualtayef, H. Ziara, A. Seif","doi":"10.52865/griy1218","DOIUrl":"https://doi.org/10.52865/griy1218","url":null,"abstract":"The world experience rapidly growing in population density and lack of areas especially coastal areas, which is considered the most vital, economic and cultural areas around the world. This force the experts investigating different suggestions such as sea reclamation and its exploitation for many goals>In this study, it is proposed to relocate the construction features of the Gaza fishery port for better sediment transport and hydraulic conditions. Therefore, the study methodology started with estimation of the construction waste quantity resulted from 2014 aggression, then ensuring its testing results, specifications and possibility of using it in land reclamation. Furthermore, the existing Gaza fishery port sediment transportation and features were studied and its bathymetry was identified. As a result, the new proposed reclaimed area was identified in west of the existing western breakwater at Gaza fishery port and its area was estimated according to estimation the quantity of debris resulted from removing the existing breakwaters in addition to construction wastes resulted from 2014 aggression. The total estimated quantity of available debris is about one million cubic meters, which adequate to reclaim about 11 hectares. However, the new reclaimed area should be surrounded by sheet piles, so the sheet pile type is assumed to be PZC 28 and finally the total cost of the proposed reclaimed area was estimated as USD130 per square meter of reclaimed area. Finally, to facilitate transportation and movement through this reclaimed area, the bridge is recommended to be constructed. Finally, the cost of sea reclamation is feasible especially that Gaza fishery seaport is very vital and important place, which will be as a fishery port and for recreational activities.","PeriodicalId":223912,"journal":{"name":"Israa University Journal for Applied Science","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125740108","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}