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Search Results: 1 - 10 of 190 matches for " Sadia Kennour "
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Impedance spectroscopy studies on lead free (Ba0.85Ca0.15)(Ti0.9Zr0.1)O3 ceramics
Ahcène Chaouchi,Sadia Kennour
Processing and Application of Ceramics , 2012,
Abstract: The AC complex impedance spectroscopy technique has been used to obtain the electrical parameters of polycrystalline sample of (Ba0.85Ca0.15)(Ti0.9Zr0.1)O3 in a wide frequency range at different temperatures. This sample was prepared by a high temperature solid-state reaction technique and single phase formation was confirmed by X-ray diffraction technique. This study was carried out by the means of simultaneous analysis of impedance, modulus, and electrical conductivity. The Cole-Cole (Nyquist) plots suggest that the grains and grain boundaries are responsible in the conduction mechanism of the material at high temperature. The ColeCole (Nyquist) plot studies revealed the presence of grain and grain boundary effect at 485 °C. On the other hand, it showed only the presence of grain boundary component of the resistivity at 535 °C. Complex impedance analysis indicated the presence of non-Debye type dielectric relaxation. The bulk resistance of the material decreases with rise in temperature similar to a semiconductor, and the Cole-Cole (Nyquist) plot showed the negative temperature coefficient of resistance (NTCR) character of (Ba0.85Ca0.15)(Ti0.9Zr0.1)O3. The value of activation energy is found to be 0.7433 eV, which suggests that the conduction may be the result of defect and charge carriers present in the materials.
Low temperature sintered ZnTiO3 dielectric ceramics with temperature coefficient of dielectric constant near zero
Ahcéne Chaouchi,Sadia Kennour,Sophie d’Astorg,Sylvain Marinel
Processing and Application of Ceramics , 2010,
Abstract: ZnTiO3 compound is an attractive dielectric ceramics owing to its interesting dielectric properties in high frequency range (εr= 19, QXf = 30,000GHz, τε ≈ +120 ppm/°C). The structure, microstructure and dielectric properties of sintered ZnTiO3, with a mixture of ZnO-B2O3 glass phase and CuO oxide as sintering aids, have been investigated. For all compounds, the sintering temperature becomes 850°C due to the glass addition. It is also shown that the addition of CuO oxide allows a control of the temperature coefficient of the permittivity (τε). This parameter varies from positive to negative values with increasing the CuO content. The ZnTiO3 composition sintered at 850°C with 5 wt.% ZnO-B2O3 glass phase and 2.2 wt.% CuO addition exhibits attractive dielectric properties (εr = 23, tan δ < 10-3 and a temperature coefficient of the dielectric constant near zero, τε= 3 ppm/°C) at 1 MHz. All these properties lead this system compatible for manufacturing Ag based electrodes multilayer dielectrics devices needed for LTCC application or other multilayer dielectric components.
Evolution and Fate of Haloacetic Acids before and after Chlorination within the Treatment Plant Using SPE-GC-MS  [PDF]
Sadia Waseem, Ijaz Ul Mohsin
American Journal of Analytical Chemistry (AJAC) , 2011, DOI: 10.4236/ajac.2011.25062
Abstract: The previous research on the occurrence of disinfection by-products (DBPs) in drinking water has focused on trihalomethane (THMs) formation and evolution, in particular within distribution systems. In this study, the variability of occurrence of haloacetic acids (HAAs) before and after treatment was investigated. The investigation focused on point–to-point fluctuations of HAAs in different treatment stages within the treatment plant. The research was also carried out to find out the possible sources for the presence of HAAs before chlorination in the raw water. The results showed that the presence of HAAs from the raw water point until the filtered water occurred due to industrial waste and sewages. Subsequent formation of HAAs from treated point until service reservoir due to disinfection. The HAAs concentration was the highest and most variable in the plant where level of DBP precursor indicators and the chlorine dose were both higher. However, HAAs level and in particular dichloroacetic acids (DCAA) (the preponderant HAAs species in the waters under study), trichloroacetic acids (TCAA) decreased dramatically during filtration, very probably because of the biodegradation within the filter. An ANNOVA test was used to evaluate the level of significance of HAAs between treated water and service reservoir outlet water.
Mixed Convection Boundary Layer Flow over a Vertical Flat Plate with Radiative Heat Transfer  [PDF]
Sadia Siddiqa, M. A. Hossain
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.37104
Abstract: In this article, the problem of mixed convection boundary layer flow of viscous fluid along a heated vertical plate is examined. In the analysis radiative component of heat flux emulates the surface temperature. Appropriate set of variables are embraced here which reduces the governing boundary layer equations into dimensionless form. Subsequently, a group of continuous transformation is applied on the dimensionless equations in order to obtain the parabolic partial differential equations for the regimes where modified Richardson number, Ri*, is 1) small i.e. when Ri* 1, 2) large i.e. when Ri* 1, and 3) covers all its values i.e. when 0 ≤ Ri* ≤ ∞. The system of equation for the corresponding regimes are thus integrated numerically via straightforward finite difference method along with Gaussian elimination technique. Its worth mentioning that results obtained here are valid particularly for the liquid metals for which Pr 1. Moreover, the numerical results are demonstrated graphically by showing the effects of important physical parameters, namely, the modified Richardson number (or mixed convection parameter), Ri*, surface radiation parameter, R, and Prandtl number, Pr, in terms of local skin friction and local Nusselt number coefficients. In addition, comprehensive interpretation of thermal energy distributions is also given in terms of heatlines which is termed as good tool to visualize the flow patterns.
Internal and External Influences on the University Teachers in Semester System
Sadia Sarwar
International Journal of Emerging Sciences , 2011,
Abstract: There are so many influences a faculty member has to undergo at the higher education level in universities in semester system. We wanted to comb the universities for the internal and external influences on the university teachers and their consequences in Balochistan. It was done to determine the loss we bear due to the influences on the university teachers in Balochistan, and to generate such influence-free-mechanism in the universities of Balochistan to strengthen the educational milieu in the province. Faculty members play pivotal role in imparting the education at the higher education level in any country. They happen to be the nucleus of the education system. Disturbing and disrupting them in any was is, in effect, disturbing and disrupting the education process. Influencing them, directly or indirectly, halts the true teaching process. It creates many obstacles ranging from class boycotts, hunger strikes to processions and demonstrations either inside the institute or outside the institute. To forge such a composite mechanism not only to control these both internal and external factors in order to streamline the learning and imparting education process but also to afford a healthy and sound teaching environment.
MATERNAL MORTALITY
SADIA KHAN
The Professional Medical Journal , 2009,
Abstract: Objective: The women residing in a developing country have 200 times greater risk of suffering from pregnancy and childbirth related mortality compared with the women of a developed country. To investigate relevant causes and the determinants of maternal mortality through conducting scientific clinical studies. Methodologies: We conducted a prospective study of maternal deaths in the obstetrics and gynaecology unit of RGH for one year. Period: January 2007 to December 2007. We investigated the socio-demographic variables -- including age, parity, socio-economic status and literacy -- along with the social behavior towards the antenatal. We designed standardized data collecting forms to collect data from the confidential hospital notes of the patients. The collected medical data of the patients proved useful in analyzing the underlying causes and the risk factors behind direct and indirect maternal mortalities. Results: In our unit, we have recorded 28 maternal deaths during the study period. 24 (86%) deaths are due to the direct causes and 4 (14%) are due to the indirect causes. The leading direct causes are hemorrhage 9 (37.5%), eclampsia 7 (29%), septicemia 5 (21%) and anaesthesia complications 2 (8%). Similarly, the distribution of indirect causes is: blood transfusion reactions 2 (50 %), hepatic failure 2 (50 %), Consequently, crude maternal mortality rate can be extrapolated at 645 per 100,000 maternities and maternal mortality ratio at 659 per 100,000 live births. The socio demographics of the dead mothers are: 16 (57%) patients in the age group of 25-35 years, 13 (52%) are multiparas (G2-G4) and 10 (36%) are grandmulti para i.e. G5 and above. Moreover, 13 (46%) of them expired at term. The majority of them is illiterate and belongs to lower socio-economic group. 14 (42%) mothers have not received antenatal care and just 4 (15%) of them have received antenatal care from RGH or other hospital. 23 (92%) patients have been suffering from anemia and we received 15 (54%) of them in a critical state with the hospital stay of less than 12 hours. Conclusion: In our study hemorrhage and hypertensive disorders of pregnancy are the leading causes of maternal deaths. We argue that most of these maternal deaths could have been possibly avoided by periodic interventions during the pregnancy, child birth and the postpartum period.
ANEMIA IN POSTNATAL PATIENTS
SADIA KHAN
The Professional Medical Journal , 2007,
Abstract: Objective: To determine the severity and the type of anemia in the postnatal patients admitted atRGH. Study Period: June 2006 - December 2006. Study Design: A descriptive observational study. Material &Methods: 160 female patients with anemia were clinically evaluated to establish the relationship between severity/typeof anemia with the socioeconomic status, age, parity and the past obstetric history. Results: Among 160 cases ofanemia, the iron deficiency anemia was the most common (87.5%), $ thalassaemia trait was in 3% of the cases. 47.5%of women were between 25-30 years of age. 83.7% of them belonged to the lower socioeconomic class. 52.5% ofpatients were multigravida. 67.5% of patients had moderate anemia. Conclusion: The present study concludes thatthe iron deficiency anemia of moderate severity is the most prevalent anemia in our lower socioeconomic class.
SENTINEL LYMPH NODE
SADIA HAMEED
The Professional Medical Journal , 2007,
Abstract: Objective: To assess the efficacy of a localization technique for thesentinel lymph node in patients with early breast carcinoma using 1% isosulphan blue. Study Design: Prospective studyPlace and Duration: Departments of Pathology, Punjab Medical College Faisalabad and Sheikh Zayed Hospital,Lahore and Departments of Surgery, Allied & DHQ Hospitals, Faisalabad from July 2002 – June 2003. Patients andMethods: 1% Isosulphan blue was used to identify the sentinel node in cases of early (T1 & T2) breast cancer. Thedye was injected just before the incision was made. The area was massaged. Mastectomy was done. The sentinel nodewas identified by following the blue track to the first coloured lymph node. This was removed and submitted separatelyfor histopathology along with the mastectomy specimen. Results: The procedure was performed in 95 cases. SLNwere identified in 80 (84%) patients. The mean age was 43.99 years. Majority of the tumours were located in the rightbreast in the upper outer quadrant. One SLN was identified in 93%, 2 in 3% and 3 were noted in 4% of the cases.Conclusion: Injection of 1% isosulphan blue around the tumour is an effective method for isolation of the SLN inselected cases. It saves the patient of the side effects of axillary clearance in node negative cases.
Origin and Development of Human Rights in Islam and the West: A Comparative Study
Sadia Rehan
International Journal of Social Science and Humanity , 2013, DOI: 10.7763/ijssh.2013.v3.189
Abstract: Human rights are the most complicated issue and challenge for the twenty first century. Islam has granted some fundamental rights for the whole humanity, without any discrimination that needs be practiced under all situations. The West claimed to be the founder of human rights due to which the people of the world are blessed with all human rights, otherwise they were steeped in ignorance. The question arisesare human rights absolute and bestowed on men by God or they are caused by the development of society or created by the society itself? Basically to answer this question, the present research is conducted by making a comparative study of the human rights granted by Almighty Allah in the Holy Quran and contemporary human rights practiced in the west. The objective of this study is to explore the origin and development of Human rights in Islam and West. After detailed study it is clear that Islam has laid down a comprehensive charter of universal fundamental rights for humanity fourteen hundred years ago. This charter granted a very noteworthy profound declaration of rights. Furthermore it is concluded that there is no substantial difference between some of the fundamental principles set forth in the West and the Islamic precepts, whereas, there is difference in their approaches. On the basis of research it is concluded that the inherent dignity of man and his fundamental freedom tracing its origin back to God or divine inspiration.
Controlling Speed of DC Motor with Fuzzy Controller in Comparison with ANFIS Controller  [PDF]
Aisha Jilani, Sadia Murawwat, Syed Omar Jilani
Intelligent Control and Automation (ICA) , 2015, DOI: 10.4236/ica.2015.61008
Abstract: Machines have served the humanity starting from a simple ceiling fan to higher industrial applications such as lathe drives and conveyor belts. This research work aims at providing an appropriate software based control system because it provides computer featured applications, prevents rapid signal loss, reduces noise while also significantly improves the steady state and dynamic response of the motor. In this research paper, we have worked on DC motors due to its significant advantages over other types of machine drives. We have first individually studied Fuzzy and ANFIS (Adaptive Neuro-Fuzzy Interference System) controller in controlling speed for a separately excited DC motor. Afterwards, we have analyzed both results to conclude that which technique is better to be adopted for precisely controlling the speed of DC motor. Outcomes from MATLAB fuzzy logic toolbox for simulation of our schematic has been provided in this research work. Our study parameters include input voltage of DC motor, its speed, percentage overshoot and rising time of the output signal. Our proposed research has interpreted the outcomes that ANFIS controller is better than Fuzzy controller because it produces less percentage overshoot and causes less distortion of the output signal as the overshoot percentage of ANFIS controller is 8.2% while that of Fuzzy controller is 14.4%.
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