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This study includes the evaluation of the problem of seawater intrusion in Al-Bassa area in 2014 through chemical monitoring of a group of sampling wells, under certain condition that were subjected to the area during the research, representing by rainfall precipitation in the study area was only 500 mm/ year, as a result in the suspension of irrigation from 16 October lake and reuse of many abandoned pumping wells. This study founds an increasing in the salinity values in the Al- Bassa coastal area of summer in 2014, ranging between(665.6-6432mg/l)after increasing daily pumping rates, in addition to the increasing of chloride and sodium concentrations in most of sampling wells water in conjunction with high salinity levels. In the fall, the salinity values ranged between 490-950 mg / l. The geochemistry of Na/Cl indicates values less than 0.84 in most water samples during the summer, while in autumn this percentage was higher than 0.84 in most samples ,to be an indicator for marine water.
Residual Calcium Hydroxide dressing on the root canal is considered one of the reasons of endodontic treatment failure. So ,the removal of this dressing completely before filling is required. The aim of the study was to evaluate the efficiencies o f passive ultrasonic irrigation And increasing the instrumentation of the medicated canal to the file one size larger than MAF in removal of Calcium Hydroxide dressing.
The importance of diagram system MnO2─NaVO3 is in obtaining a crystal phase (chemical compounds or solid solutions). Acknowledging the fact that these compounds have grade properties in the field of technology, it was important to study the possibi lity of obtaining new phases with different mole ratios, and to draw phase diagram for it, especially the used compounds in this study have different crystal structures. The samples were made beginning from powders of reagent grade MnO2 and NaVO3 of 5gr for each of them at following percentage mole ratios of MnO2: (10, 20, 25, 30, 33.33, 50, 66.66, 70, 71, 75, 80, 90). The mixing and grinding process was made for these samples. Then, it made pills ellipsoidal using manually hydraulic press, and it burned into oven at different degrees. The study was made using powder X─Rays diffraction PXRD and different thermal analysis TG─ DTA. The results are compared with X─rays spectrums of grade compounds and parameters of it. Then, the formation phase changes degrees were determined. New compound was formed at ratio (MnO2)10(NaVO3)90 mole%, and crystal solid solution was formed to ratio (MnO2)25(NaVO3)75 mole%. As well solid solution (amorphous+ new compound) was formed until mole ratio (MnO2)75(NaVO3)25 mole%, and amorphous solid solution was formed beginning mole ratio (MnO2)80(NaVO3)20 mole%, then the phase diagram for the studied system was drawing.
This research was carried out to test the effect of three basic preservation methods cooling, canning and freezing on the nutritional value of mushroom Agaricus bisporus. Mushroom were picked from a private sector then stored for 20 weeks. Chemica l analyses of mushroom were conducted at three phases: at time zero which means immediately after preservation, after ten weeks and after 20 weeks. Sodium benzoate 5% and potassium serrate and 5% were tested as preservatives.
Lead and sodium molybdates form one of the most promising chemical compounds because of their various and important properties when used in many different technological applications such ceramic preparation, melting resistance materials and used in solar energy applications. This research aims to study the equilibriums phases in the binary system of sodium molybdate with lead molybdate. We used there for tow techniques :The technique of X-ray diffraction, and technique of differential thermal analysis to study some physical properties. The result of this research was the obtaining of a solid solution based on a lead molybdates, where the sodium molybdate is dissolved in the lead molybdateup to 40 % molar percentage.
Photosynthetic transport was studied as an indicator of photosynthesis efficiency in two bread wheat cultivars (ACSAD 899, ACSAD 1059) under the influence of one of the salt stress. This study was carried out in sand cultures irrigated with nutrie nt solution in a growth chamber, and 14 days seedlings were treated with 100 mM of sodium chloride. Later the electron transport rates in those plants thylakoids were measured in 21, 28, 35 days of the experiment. Electron transport rates decreased in ACSAD 899 and reached 57% in the last day of the experiment, while it was 24.6% in ACSAD 1059. The decrease in photosynthetic electron transport rate leads to a decrease in the reduction rate of CO2 and the plant productivity as a consequence. Therefore, it could be used as criterion to express photosynthesis.
In this research, we studied the quantum effect of the electronic density change effect of some sodium( Nan) clusters properties, electronic and spectral properties changes.We have been studied using density functional theory: (DFT/B3LYP(6-311+G(2d))). Density Functional Theory (DFT) is a computational method that derives properties of The sodium clusters (neutral and positively) based on a determination of the electron density of the clusters.
In this research study Toisat phase in bilateral Wholesale (NaVO3-CaMoO4) in vitro (in the laboratories of the Faculty of Science), where is the concept of phase transitions, the basis for many of the natural sciences chemistry , physics and biolog y, which is the premise of science engineering, mechanical and electrical such as engineering and materials engineering. Transitions are considered the metaphase common in nature, it has benefited rights in the development and improvement of old materials, which was able to elaborate the phase transitions unfamiliar (Fluid high, conductivity high, glass metals) and in which they can solve many of the technical problems that were facing the technology, and this is still the door open as long as the will to improve life on the basis of scientific progress exist. ??When examining any material changes within the stages, studying the so-called scheme of balance or eccentric scheme, since the material balance energy Minimal when changing variables Altermdinamekih. Practically impossible to reach a state of equilibrium, lies the importance of research to obtain crystalline compounds in the binary strings of dead sodium vanadate with calcium molybdate what these salts from the properties of the quality in the areas of technology, so it was important to study the possibility of obtaining new phases at different Molar ratios and fee balances schemes her eccentric. Especially since the salts derived for the study have different crystalline structures and can therefore predict that the outputs of the study will be important and good. This study shows form the core of a solution on the basis of calcium molybdate where dissolved sodium molybdateMataffanadat in calcium up to 40% of sodium Mataffanadat.
The Objective is to determined whether enamel conditioning with sodium hypochlorite (5,25%) and EDTA prior to etching was increased shear bond strength of orthodontic brackets bonded with resin – modified glass ionomer. our sample consisted of 42 extracted human premolars were randomly divided into 3 groups.
In this paper, detail technical and economic feasibility study are implemented to use the improved solvent instead of the used solvent in Syrian field (Sodium hydroxide, NaOH) until this time, to prevent and remove the sulfur deposits in the gas w ells that most suffer from this problem. Has also been confirmed on the technical best method for suggested solvent injection and depend on the field data of the studied wells /Jbissah-223, Jbissah-220/ to carrying out the required economical calculations, and the sensitivity analyzing for changes of economical with changes of dollar exchange rate and gas production rate from studied wells are performed, and then the curves of economic Feasibility study resulting from the comparison process was drawing. And recommending the use of the improved solvent where this solvent is the most economic solvent.
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