Simulation of Demographic Change in Palestinian Territories

Mortality, birth rates and retirement play a major role in demographic changes. In most cases, mortality rates decreased in the past century without noticeable decrease in fertility rates, this leads to a significant increase in population growth. In many poor countries like Palestinian territories the number of births has fallen and the life expectancy increased. In this article we concentrate on measuring, analyzing and extrapolating the age structure in Palestine a few decades ago into future. A Fortran program has been designed and used for the simulation and analysis of our statistical data. This study of demographic change in Palestine has shown that Palestinians will have in future problems as the strongest age cohorts are the above-60-year olds. We therefore recommend the increase of both the retirement age and women employment.Comment: For Int. J. Mod. Phys. C 18, issue 11; 9 pages including figures and progra

Thermal performance analysis of a new structured-core translucent vacuuminsulation panel in comparison to vacuum glazing: Experimental and theoretically validated analyses

The notion at which, nowadays, building sector is being recognized to be nearly zero-energy buildings (NZEBs) relies partly on the thermal performance of its fabric insulation. Vacuum glazing (VG) technology attracted the research interest as an option to reduce heat loss through windows. However, the total glazing thermal transmittance (U-value) for VG increases with the use of smaller glazing area due to the edge-seal effects, due to the thermal short-circuit around the edges and the overall construction cost of VG leading to an unaffordable option to deal with energy conservation of buildings. Therefore, this study aims to propose a new structured core transparent vacuum insulation panel (TVIP) to accomplish insulation for the windows without edge sealing effect, with lower cost and can be easily retrofitted to the conventional windows of the existing buildings. To do this, VG and TVIP were constructed and their thermal conductivity were measured using heat flow meter apparatus. In addition, a 3D finite volume model considering the effect of surface to surface radiation, gas conduction, and thermal bridges through the spacer material and sealing material is developed. The model is validated with the experiments in this work and with the data for VG in the literature. The effect of vacuum pressure increase is simulated to mimic the vacuum deterioration problem and the effect of glazing size on the insulation performance of both VG and TVIP were investigated. The results indicate that for a smaller glazing area of less than 30 cm × 30 cm, the TVIP accomplished lower U-value compared with the VG at vacuum pressure of 0.1 Pa and 1 Pa. While, at a vacuum pressure of 10 Pa, the TVIP attained a lower U-value over the entire range of the investigated glazing sizes. Further, the edge-seal effect in the VG is diminished with the use of TVIP. Furthermore, the material cost per unit area of the TVIP is three times less than the cost of VG at laboratory scale. The results of the current study can guide vacuum window designers and researchers to further enhance the performance of TVIP based window to compete for the VG in the markets

Hydrothermal Preparation Of Palladium Supported On Magnetite For Catalysis Applications

Herein, versatile, and reproducible method to prepare Pd/Fe3O4 via hydrothermal synthesis. The vital role of this catalyst is in its potential use in CO oxidation catalysis. The Pd/Fe3O4 shows a distinctive activity. TEM images confirmed that Pd nanoparticles of 8-12 nm have a well dispersion on the surface of magnetite (Fe3O4). Moreover, the prepared catalyst is recycled with remarkable catalytic activity. This outstanding activity is mainly a direct result of the strong metal-support interaction. The defect sites in the reduced iron oxide act as nucleation centers that enable anchoring of Pd nanoparticles leading to prevention of agglomeration

The Effect of Nano–Micro Silica Mixture on the Shear Strength of Reinforced Concrete Beams

This paper examines the significance of nano silica and micro silica mixture on the shear strength of reinforced concrete beams. The nano and micro silica mixture was used as a partial replacement for Portland cement with different proportions to produce four (4) concrete mixtures. In this research, the tests on fresh concrete mixtures (slump test, density test and air content test) were performed. The compressive strength of concrete mixtures was tested. The shear strength of reinforced concrete beams with and without shear reinforcement is examined. Moreover, the influence of the multi-sized silica mixture on other mechanical characteristics of concrete related to the shear behavior of concrete beams, shear crack width, the inclination angle of shear cracks and deflection were also examined. From test results, the mixture of 2% nano silica with 8% micro silica was found to lead to the highest compressive strength, it improve the concrete compressive strength up to 33% compared with control specimens. The shear strength of the concrete beam incorporating 8% micro silica and 2% nano silica mixture was also improved, it increased by 30% and 59 % for beams with and without steel stirrups, respectively. The significance of nano-micro silica mixture on the concrete contribution to the shear strength of reinforced concrete beams is examined. The nano-micro silica mixture increased concrete contribution to shear strength of reinforced concrete beams up to 17%

Experimental and theoretical performance evaluation of parabolic trough mirror as solar thermal concentrator to thermoelectric generators

This paper presents the prospects of harnessing radiative heat from the sun with a parabolic trough mirror, as a solar thermal concentrator, in comparison to the mathematical model and experimental quartz-halogen concentrator model for the electrical energy conversion utilizing thermoelectric generators (TEG). The construction and design of TEG-setup along with Parabolic trough mirrors and quartz-halogen lamps are presented. The Parabolic trough mirror used as a focal point at a distance of 19.05 cm. With eight quartz-halogen concentrated heat, the maximum performance achieved at ΔT of 11.8 K, Voc of 292 mV and Isc of 95.8 mA, recorded at the concentrated hot-side surface temperature of 317.8 K. When compared to the natural solar concentrated heat, higher temperature of 473.15 K at the hot-side surface temperature of TG was achieved. It is concluded that the heat concentration of the parabolic mirror increases with an increase in the intensity of heat using natural solar radiations. The Voc of 1.76 V and Isc of 1.1 A at a temperature difference of 110 K were measured, which are in good agreement with validated mathematical results. The parabolic through mirror utilized is smaller in size and thus collected lesser sun rays than the larger dish style mirror, and hence the heat in the focal point was very low, for better results, parabolic trough mirror with higher surface area would be important for future experiments

INFLUENCE OF MAGNETIZED WATER ON THE GROWTH OF CORN (ZEA MAYS) SEEDLINGS

This study was conducted to evaluate the response of some growth characteristics of corn (Zea mays) seedlings for watering with magnetized water. For this experiment, we took corn seedlings and separated it into two sets. The first set watered with magnetized water and the second one was given tap water (control). The magnetized water was prepared by passing of tap water through the magnetization device at a relatively low speed and then collected into bottle for distribution. The seedlings were immediately watered after magnetization of water. The growthrelated aspects of corn seedlings were investigated for 7 weeks. The results of the current study revealed that the seedlings’ length, stem thickness, leaves number and leaves morphology were affected by magnetized water. Analysis of the results revealed the positive effects of magnetized water on the growth of corn seedlings. The seedlings that given magnetized water exhibited marked increases in shoot length, stem thickness and leaves number per seedling, and also changes of morphology of leaves over the control.أجريت هذه الدراسة لتقييم استجابة بعض خصائص النمو شتلة الذرة (زيا ميس) لسقي بالماء الممغنط. لهذه التجربة ، اتخذنا الذرة الشتلات وفصلها إلى مجموعتين. المجموعة الأولى تسقى بالماء الممغنط والثانية أعطيت واحد ماء الصنبور (السيطرة). تم تحضير الماء الممغنط بتمرير ماء الصنبور من خلال جهاز مغنطة بسرعة منخفضة نسبيا ثم جمعت في زجاجة ل توزيع. تم سقي الشتلات على الفور بعد مغنطة المياه. تم التحقيق في الجوانب المرتبطة بالنمو لشتلات الذرة لمدة 7 أسابيع. نتائج الدراسة الحالية كشفت أن طول الشتلات وسمك الساق وعدد الأوراق والأوراق المورفولوجية كانت تتأثر المياه الممغنطة. كشف تحليل النتائج الآثار الإيجابية للممغنطة الماء على نمو شتلات الذرة. الشتلات التي أعطت المياه الممغنطة عرضت ملحوظ يزيد في طول تبادل لاطلاق النار ، وسمك الجذعية ويترك عدد لكل الشتلات ، وكذلك تغييرات التشكل من الأوراق على السيطرة

RESPONSE OF CORN (ZEA MAYS), BASIL (OCIMUM BASILICUM) AND EGGPLANT (SOLANUM MELONGENA) SEEDLINGS TO WI-FI RADIATION.

The objective of the present study was to investigate the changes of growth related aspects of seedlings after being exposed to Wi-Fi radiation. Experiment was carried out by exposing seedlings to radiation from a Wi-Fi router. The test seedlings and the control were subjected to the same environment during four weeks. The results showed that corn seedlings when exposed to Wi-Fi radiation grew faster and have shoot length and stem thickness significantly larger than the other control. On the other hand basils and eggplants, both exposed and not exposed to Wi-Fi radiation, were found with no significant effects on the shoot length and stem thickness. Moreover Wi-Fi radiation significantly reduced the fresh weight of corns and basils, whereas eggplants were not affected. Furthermore Wi-Fi radiation significantly increased the dry weight of eggplants, whereas corns and basils were not affected. Finally, the results showed that Wi-Fi radiation significantly decreased the water content of three tested seedlings. The study concluded that the Wi-Fi radiation may alter growth related characters of seedlings

CXCR 3 expression on CD4+T cells and in renal tissue of pediatric systemic lupus erythematosus patients

Background: Pediatric systemic lupus erythematosus (pSLE) accounts for about 20% of all cases of Systemic Lupus Erythematosus (SLE), with nephritis occurring in approximately 50% of the patients. Objective: to evaluate the expression of CXCR3 in the kidneys and on CD4+ T cells in pSLE. Methods: This study was conducted on 45 patients with pSLE following up at the Allergy and Immunology Clinic, Children’s Hospital, Ain Shams University and 45 age and sex matched healthy children as a control group. Medical history, clinical examination and routine laboratory investigations for assessment of disease activity were done for all patients, the frequency of CXCR3, CD4+ T cells was determined in all patients and controls. Twenty-five Paraffin blocks of patients with lupus nephritis (LN) (available at the time of the study) underwent immunohistochemistry staining for the frequencies of Chemokine C receptor (CXCR3). Results: The absolute level and percentage of serum CD4+CXCR3+ were significantly lower among our patients as compared to healthy controls. A significant direct correlation was found between serum CD4+CXCR3+ and both the lymphocytic count and quantitative Systemic Lupus erythematosus disease activity index (SLEDAI), as well as a significant inverse correlation between it and 24 hours urinary proteins. Variable degrees of CXCR3expression seemed to have no impact on laboratory tests, British Isles Lupus Assessment Group (BILAG) score and cumulative doses of Immunosuppressives. Conclusion: Serum CD4+CXCR3+ and not renal CXCR3 may be a potential marker of LN activity