Prof. Dr. ISMAIL YILDIRIM
A novel biomass-based and low cost magnetic activated carbon (MAC) was synthesized from a peanut shell via a simple one-step method using hydrochloric acid pickling water as an activating agent. The effectiveness of MAC in the removal of methylene blue (MB) has been investigated extensively. The morphology and surface chemistry of the obtained MAC were characterized by Fourier transform infrared (FT-IR), X-ray diffraction spectra (XRD), scanning electron microscopy (SEM) and Brunauer–Emmett–Teller (BET) surface area. A batch adsorption study was performed at varying pH levels, dye concentrations, temperatures, and adsorbent doses. In order to examine the adsorption kinetic and the mechanism of adsorption, pseudo-first-order, pseudo-second-order and intra-particle diffusion models were fitted. It was found that the equilibrium data were best represented by the Langmuir isotherm, with the maximum monolayer adsorption capacity of 201.61 mg/g at 298 K. The adsorption kinetic followed a pseudo-second-order equation. Thermodynamic study showed that the adsorption was a spontaneous and endothermic process.
Twenty six cattle, age ranging from 8 months to 4 years and different sex were employed in this study. All were clinically diagnosed as bloat due to different causes. On humanitarian ground no control maintained. All the 26 were orally drenched with the extract of finely grounded Leucas aspera. Purgation occured within 1 – 2 hours and 22 cattle were found relieved of the bloat. 84% recovery rate noticed.
This study concern the measurement of the diameter of abdominal aortaat its bifurcation to right and left femur artery, for diabetic patients and hypertensive patients and normal ascontrol group using Multi Detector Computed Tomography MDCT 64 slice. Information was available for 300 patients, 100 patient’s diabetics, 100 hypertensives and 100 normal as a control group, Diameter measurement of abdominal aortic at its bifurcation to right and left femur artery and the study sample diabetic patients and hypertensive and control group a normal; the average diameter of normal femoral artery was (7.96 mm) which is bigger than that of hypertensive patients (7.41 mm) and diabetic (5.91 mm) patients, for abdominal aorta bifurcation of hypertensive patients the diameter was (17.18 mm) which is bigger thanthe normal (16.47 mm) and diabetic patient’s which is (14.89 mm). diameter of abdominal aorta and its bifurcation to left and right femoral artery show that the hypertensive patients showed bigger diameter than the normal and diabetic patients, and the dimension of left and right femoral artery the normal patients showed bigger diameter than hypertensive and diabetic patients.
The carbon monoxide is a toxic and life-threatening gas to humans and other forms of air-breathing life. In present time, the low-temperature oxidation of carbon monoxide is applicable in large scale of application in automobile and other fields. In this paper, the different types of cobalt precursors were prepared in the laboratory for oxidation of carbon monoxide at low temperature. The precursor was converted into the catalyst by calcination at 300oC temperature. The cobalt precursor first drying at 120oC temperature for 12h then calcined at 300oC in different calcination conditions. The catalytic activity measurements were examined in room temperature to 250oC, the 100mg of catalyst was used in presence of 2.5%CO with air and total flow rate was 60mL/min. They are several techniques has used for the characterization of the catalysts such as XRD, SEM-EDX, FTIR and XPS analysis. The low-temperature CO oxidation activity measurement showed in all of the catalyst and the best activity was obtained from cobalt oxalate precursor prepared catalyst at 110oC temperature. The order of activity for different cobalt precursor was as follows: Cobalt Oxalate > Cobalt Acetate > Cobalt Nitrate.
This study reports fabrication and characterization of Tin sulphide (SnS) based thin film solar cells. The solar cell was fabricated using simple two electrodes electro-deposition technique to deposit window layer; Zinc sulphide (ZnS) and absorber layer; Tin sulphide (SnS) thin films on an Indium doped Tin oxide (ITO) coated glass slide and Silver paste was paste on the absorber layer (SnS) as back contact of the cell. Thus, a device structure of glass/ITO/ZnS/SnS/Ag solar cells is obtained. The active region SnS/ZnS hetero-junction was characterized using X-Ray diffractometer to reveals the presence of these phases. The device area is 1 cm2 and was characterised using solar simulator at 1.5 AM with Keithley source metre coupled with interactive characterisation software to obtain both dark and illuminated I-V characteristic of the cell. From characteristic curves of the cell, the Voc is read to be 0.17 V; Isc to be -2.85x 10-8A; Vmax to be 0.06 V and Imax to be -1.21x10-8A. Thus, the fill factor (ff) was calculated to be 0.15 while the efficiency below 1 % was computed for the cell. The study therefore concludes that a SnS based thin film solar cell free of Cd is feasible and recommend further research to improve the efficiency of the cell.
The study entitled “Effect of IBA, PHB and time of planting on rooting of pomegranate (PunicagranatumL.) cuttings cv. Ganesh’’ was undertaken at the nursery of Department of Horticulture during 2015-2016. The objective of the study was to determine rooting ability of cuttings of pomegranate in response to (a) Effect of IBA, PHB and their combination (b) The time of planting (August and January). To achieve the objectives the same experiment was carried out in the both months. Uniform sized cuttings of pencil thickness, 20 cm long taken from healthy pomegranate in August and January. The growth regulators (IBA and PHB) was applied by adopting quick dip method (for 1 min.) technique. Results of the study showed that the maximum percentage of sprouted cuttings (85.45%), survival percentage (85.88%), maximum number of roots (18.58), maximum root length (11.13cm) and maximum root weight (1.80 g) were recorded in T6 (IBA 1000 ppm + PHB 750 ppm). The month of August proved to be the best time of planting for success of cuttings.
Turbulence is seen as one of the last outstanding unsolved problems in classical physics. In the last century, great minds viz, Heisenberg, von Weizs"acker, Kolmogorov, Prandtl and G.I. Taylor had worked on it. Einstein put his last postdoc Bob Kraichnan on the subject of Turbulence. Despite the fact that isotropic turbulence constitutes the simplest type of turbulent flow, it is still not possible to render the problem analytically traceable without introducing the two point double and triple longitudinal velocity correlations to admit self-similarity solution with respect to a single length-scale, which has served as a useful hypothesis since its inception by von Karman and Howarth (1938). Rapid development of experimental and numerical techniques in this area and the growth of computing power created a lot of activities on turbulence research. Here authors have elaborated a debated concept Loitsiansky’s type of invariant associated with turbulent study from analytical point.
Screening of hydrocarbon degrading microorganisms from crude oil contaminated soil (near Indian Institute of Petroleum, Dehradun) by selective enrichment technique, resulted in the collection of two distinct study species (Bacillus sp.and Micrococcus sp.). Both strains were firstly cultivated in liquid media with Glucose as the carbon and energy source. Morphological characteristics of strains were determined by preparing nutrient agar plates parallel. Further, both strains growth was examined by using four different hydrocarbons (n-Parrafin, Xylene and Naphthelenemixture (1:1), Petroleum coke and Lube aromatics) as a sole carbon and energy source in different set of experiments. Growth study and kinetics data of both strains in these set of experiments were studied and analysed. The results directly indicate the different hydrocarbon degradation potential of both strains.
Education equips people with knowledge and skills that enable them to function as agents of economic and social change in the society. When people are educated, their standard of living are likely to be improved, since they are empowered to access productive ventures which will ultimately lead them to an improvement in their livelihoods. In the developed part of the World like America and Europe, studies have shown that there exist a very strong relationship between leadership styles and job satisfaction of employees, however, little work has been carried out in Africa for which Ghana is inclusive. Even in relation to the little work done, the concentration has not been on subverted organizations such as Ghana Education Service in spite of the low standards of education. The study was purely descriptive in nature, which adopted a sample size of 217 with the help of systematic random sampling techniques. The study therefore examines how the three leadership styles (transformational, transactional and laissez-faire) influence job satisfaction of Senior High School teachers in the Techiman Municipality of Ghana. The study revealed that, there is no dominant leadership style exhibited by headmasters of the Senior High Schools in the Techiman Municipality. It also showed that the Senior High School teachers in the Techiman Municipality are moderately satisfied. Again, the study showed that transformational leadership showed the highest effect on the overall job satisfaction followed by transactional leadership. Laissez-faire leadership also showed a negative effect on the overall job satisfaction. The study recommended that, Ghana Education Service should organise training on ‘Full Range Leadership’ for headmasters of the Senior High Schools in Ghana in order for them to know the effects of the various leadership behaviours. Also, the study further recommended that, the government of Ghana should improve the salaries, working conditions and fringe benefits of teachers in the Senior High Schools in order to enhance satisfaction levels of the teachers on the job.
Reflective coating applied to building envelopes are becoming increasingly important because of their benefits in terms of internal cooling and energy savings. Because of their optical properties, reflective materials stay cooler than standard materials under the same conditions; therefore, they are also known as cool materials. This paper presents a review on the application of reflective materials on buildings’ walls, fenestration and roof. The thermal performance of these materials has been analyzed using different methodologies. Thus, the reported studies can be classified into five categories: envelope components, test cells, computational fluid dynamics, building simulation, monitored buildings,. The paper describes the results obtained by means of these methodologies, the main characteristics of the models and, when available, the optical properties of the standard and cool materials. The temperature of cities continues to increase because of the heat island phenomenon due to undeniable climatic change. The observed high building temperatures intensify the energy problem in buildings, deteriorates thermal comfort conditions, and increases cooling load. To counterbalance the phenomenon, important mitigation technologies have been developed and proposed. Among them, technologies aiming to increase the albedo of cities and use of insulators appear to be very promising, presenting relatively high building temperature mitigation potential. This paper aims to present the affect of, when applied in the building, the reduction in temperature was found up to 12⁰C and 40% saving in energy were achieved.