2020-08

the Iraqi Journal of Agricultural Sciences, (القضية : 4) (الحجم : 51)

This study was aimed to investigated the relationship between the daily average of meteorological parameters (MP), and the daily average (DA) of air pollutant concentrations (PC) (including particulate matter (PM)). In this study, the DA of air PC, such as carbon monoxide (CO) and sulphur dioxide (SO 2), was measured during heavy traffic in the summer season for five different locations throughout 2017, and comparison made with results similarly obtained in 2012. The particulate matter sample has been collected for the same period. The daily average meteorological parameters (MP) such as temperature (T), atmospheric pressure (AP), wind direction (WD), wind speed (WS) and relative humidity (RH) were measured and collected from the Directorate of Meteorology and Seismology Instrument at DC during the same period. The microstructure and morphology of the particles have been investigated using scanning electron microscopy (SEM), and reflected light microscopy (RLM). The chemical composition of the particles has been studied using energy-dispersive X-ray (EDX) and atomic absorption spectrometry (AAS). The EDX analysis shows that silicon and calcium were found to be the most abundant elements in the dust particles. Mineralogical characterization was carried out using X-ray diffraction (XRD), and results of which indicate the presence of calcium carbonate (CaCO 3).

2020-08

Journal of Applied Science and Technology Trends (القضية : 3) (الحجم : 1)

In this work, a simple method for producing Perovskite solar cells [PSCs] by recycling automobile batteries is used. Trying to get rid of some structures or materials which are harm to the environment (ie recycled car batteries) by using lead [Pb] sheets from those battery. Also, by reusing car batteries we will avoid the disposal of toxic battery elements and provide an alternative technique, readily-available Pb source for fabricating PSCs. Perovskite solar cells [PSCs] were prepared by two-step spin coating solution method grown on the FTO glass substrate. The organo-halide PSCs consists of four layers over FTO glass substrate. Lead iodide (PbI2) and methyl-ammonium iodide (CH3NH3I) used to form the structure of the precursor (CH3NH3PbI3) by the above-mentioned coating method. The photovoltaic performance of PSCs was investigated, together with the stability of PSCs, and the effect of annealing temperature of PRK layer on performance of PSCs. Characterization of PSCs achieved by using X-ray diffraction, SEM, and Spectrophotometer techniques. The effect of annealing on the optical properties of MAPbI3 films were studied by measuring spectral transmittance. The energy band gap value of the MAPbI3 film was found to be 1.60 eV.

2016-09

American Scientific Research Journal for Engineering, Technology, and Sciences (ASRJETS) (القضية : 2) (الحجم : 26)

Environmental pollution is an emerging issues in the developed and developing countries. Rapid urbanization and industrialization is directly involved with the pollution of heavy metal in roadside dust. Heavy metals present in roadside dust are of interest due to their deleterious impacts on both human and ecosystem health. This study attempts to investigate the pollution by heavy metal in roadside dust at Duhok city, Iraq. Five locations were selected based on the traffic density on the roads and different anthropogenic activity. To assess the pollution of heavy metal in roadside dust samples were collected under stable weather conditions during dry season, and analyzed for Zinc (Zn), lead (Pb), Zinc (Zn), Nicle (Ni), Cobalt (Co) and Cadmium (Cd) concentrations. The range of Zn and Pb was concentration varied from 90.6 to 559.2 mg/kg and from 25.1 to 169.1 mg/kg in the roadside dust respectively, with a higher mean value observed in the industrial area. The results indicate that roadside dust is moderately contaminated with respect to Pb, Zn, Ni, Cd, and Co. High contents of these elements could be attributed to anthropogenic effects related to traffic sources. Also, the results of this study were compared with several cities around the world.

2015-08

International Journal of Advanced and Applied Sciences (القضية : 2) (الحجم : 8)

The present study is an attempt to assess and to find out the impact of human activities during the festival of Nawruz in Duhok City in Iraq. The study was conducted to determine the trends and variations of noise levels at various areas of the City. Noise levels were monitored during Nawruz Festival with the help of sound level meter. The results of noise monitoring show an enhanced pressure of noise during the festival of Nawruz. The average noise level on festive day show a rise of more than 20% compared to non-festive day. It was found that the noise level was higher as comparison to the standard limit of noise.

2014-01

International Journal of Innovative Research in Science, Engineering and Technology . (القضية : 1) (الحجم : 3)

Cooling of the solar cells is a critical issue, especially when designing concentrating photovoltaic (PV) systems. In the present work, the cooling of a photovoltaic panel via Water immersion technique is investigated. The aim of this project is to optimize the efficiency of a solar panel by submerged it in distillated water at different depths. Experiment is done for polycrystalline silicon panel. An evident increase of efficiency is found with increasing the water depth. Results are discussed; thermal drift has been reduced and the solar panel efficiency has increased by about 11% at water depth 6 cm.

1996-01

Journal of materials science (القضية : 1) (الحجم : 31)

Optical and microstructural properties of electrodeposited molybdenum-copper (Mo-Cu) black coatings have been studied with reference to their selectivity in absorption of solar radiation. Such coatings were found to have a solar absorptance, α, about 0.87 and low thermal emittance, ɛ, such that the selectivity, α/ɛ, was 3.6. Electrodeposited molybdenum-black coatings generally have selectivity α/ɛ∼3. The oxidation state of molybdenum in (Mo-Cu) black coatings as determined by X-ray photoelectron spectroscopy is about + 5 (which is fairly close to that of Mo4O11). Large numbers of irregular particles were found on the surface of molybdenum-copper black coatings. There is evidence that the particles contain copper oxide

1995-06

Metal Finishing, (القضية : 6) (الحجم : 93)

Addition of CuSO4 to the molybdenum black plating bath gave a selectivity factor value α/ε of 3.6, when α = 0.87. It was observed that the properties of these coatings depend on the deposition conditions and bath composition. Coatings of higher selectivity factor (α/ε = 5, when α = 0.87) could be obtained by using an intermediate layer of bright nickel instead of dull nickel. The microstructure of the electrodeposited coatings consists of relatively flat, smooth, irregular platelets with prominent fissures. The coatings have irregularly shaped particles on the surface and consist mainly of molybdenum oxide