The characterization of sabkhas in the Eastern parts of Saudi Arabia and its implications for engineering.

PhDThe sabkhas of the Eastern Province of Saudi Arabia, some coastal some well inland, exhibit variation in clastic fraction, evaporite type, and brine composition. The clastic fraction largely reflects the local host lithologies with carbonate tending to be more important inland than on the coast. While halite is ubiquitous, its abundance is highly varied and it is derived sometimes by evaporation of brine, sometimes deposited as wind blown material. Gypsum forms mainly in layers and again has varied origins. It is particularly abundant where it occurs in the host rocks of the sabkha. The brines are of varied density and composition with the aquifer brines being sometimes relatively fresh while the shallow groundwater is nearly saturated in NaC1. The molar ratio of C1 to Na exceeds unity and varies up to about 1.4. Magnesium is also locally very high- especially where sodium chloride has been extracted from the brine. There are systematic relationships between the ionic concentrations with a numerical relationship occurring between sulphate, bicarbonate, magnesium, and sodium. Brine composition also relates to location but this appears to relate to brine/mineral equilibria with water origin and blending playing a lesser role. The water table has risen into a layer of some 3 metres of fill placed on Sabkhat A1 Fasl while the level, has remained unchanged in residual windows in the sabkha. Experiments show both seasonal and diurnal cycles in water level and that the rise probably relates mainly to lateral tlow of the groundwater. The flow reflects evaporation in areas where the capillary fringe broaches the ground surface. Where infiltration occurs it does not link up with the capillary fringe but evaporates to produce an embryonic salt crust where the salt is added from wind blown dust. Test beds show that the capillary fringe rises into fill by nearly a metre in a little over a year. The presence of salts in the fill, reduces the level to which the capillary fringe reaches. The fill is clearly ineffective and observed damage to construction and cultivation may be mitigated by the use of a more varied thickness of fill combined with the excavation of windows or drains in the original sabkha surface. Experiments in the use of capillary breaks show that though they slow the rise of mositure and salts they are not particularly effective and consideration needs to be given to the design of such breaks to make them more effective. They are however likely to prevent infiltration

Empirically Investigating Saudi Arabian Accountants’ Readiness to Implement IAS 2

This study focuses on practicing accountants in Saudi Arabia to examine their readiness to adopt the mandatory International Financial Reporting Standards (IFRS). More specifically, it investigates the International Accounting Standard for Inventories, an indicator for accountants’ understanding of IFRS requirements. To do so, we conduct an online questionnaire survey, which reveals that 52.27% accountants may not be ready for IFRS implementation. The lack of knowledge about certain IAS 2 requirements raises further concerns about accountants’ readiness to implement more complicated IFRS, some of which have no comparable local financial accounting standards. These findings draw attention to the effectiveness of IFRS training courses. Further, 57.20% accountants, all of whom reviewed the Saudi Organization for Certified Public Accountants’ (SOCPA) website, provided appropriate answers, indicating SOCPA’s significant contribution toward the spreading of awareness and knowledge about IFRS. Our findings have implications for practitioners and accounting regulators as well as bodies responsible for standardizing accounting practices in Saudi Arabia. In particular, they suggest steps necessary to increase accountants’ readiness for IFRS adoption, which became mandatory since January 1, 2017, for all listed companies. In conclusion, this study serves as a foundation for future research on the topic, which can be extended to the realm of auditors, and obstacles confronting accountants in IFRS implementation

Some Results on f-Simultaneous Chebyshev Approximation

Let X be Hausdorff topological vector space and f be a real valued continuous function on X: In this paper we introduce and study the concept of f-simultaneous approximation of a nonempty subset K of X as a generalization to the problem of simultaneous approximation. Further we present some results regarding f-simultaneous approximation in the quotient space

The Ability of Green Tea (Camellia sinensis) Extract in Modulating the Cytogenetic and Haematological Effects of Mitomycin C in Albino Male Mice

The present study aimed to investigate the toxic and mutagenic and anti – mutagenic effects of the aqueous extract (5, 10 and 15 mg/kg) of green tea (Camellia sinensis) in modulating the genotoxic effects of mitomycin C (MMC). Albino male mice (Mus musculs) were employed as a biological system and four parameters were performed in vivo; total leucocyte count, mitotic index, chromosomal aberrations and micronucleus formation. The plant extract was evaluated through three types of treatments. In the first, the extract was given alone orally. While the second and third treatment included two types of interactions with MMC; pre – and post – MMC treatments. All treatments were paralleled by negative and positive controls. In the first treatment, the dose 15 mg/kg of green tea extract enhanced the parameters investigated and a significant increase was observed in total count of leucocyte (8070 cells/cu. mm. blood) as compared to either negative (6900 cells/cu. mm. blood) or positive (5060 cells/cu. mm. blood) controls, Such observation was positively correlated with the mitotic index. In contrast, the spontaneous formation of micronuceli and chromosomal aberrations were decreased in the three investigated doses of the extract. The results showed that the plant extract had no genotoxic or mutgenic effects. In the second and third treatments, green tea extract showed a good performance in protecting the bone marrow cells in mice against genotoxic MMC effect by increasing the total leucocyte count and mitotic index and decreasing the chromosomal aberration and mironuclei when the treatment were before or after the MMC

An experimental study of binary collisions of miscible droplets with non-identical viscosities

The dynamics of binary collisions of equi-diameter droplets with non-identical viscosities have been investigated experimentally and compared to previously generated data from identical droplet collisions (Al-Dirawi and Bayly in Phys Fluids 31(2):027105, 2019). Three hydroxypropyl methylcellulose (HPMC) aqueous solutions, 2%, 4%, and 8% HPMC, were used to generate the droplets of different viscosities, 2.8, 8.2, and 28.4 mPa s, respectively. High-speed imaging techniques were applied to observe and capture the collision outcomes. Collision outcomes were characterised and regime maps were generated. The non-identical viscosity droplet collisions produced regime maps with well-defined boundaries which are comparable in shape to the conventional regime maps of identical droplet collisions. The boundaries of the bouncing and reflexive separation regimes of the non-identical collisions show intermediate position between the identical cases of the low and the high viscosity droplets. However, the boundary of the stretching separation regimes of the non-identical collisions showed good agreement with the boundary of the identical case of the lower viscosity droplet. Moreover, the ability of models developed for predicting the regimes boundaries of collisions of identical viscosity droplets was assessed for the non-identical collisions. They proved capable in the non-identical cases, and the changes in adjustable parameters were consistent with the underlying physical basis of the models

The Effect Of Thickness on The Optical Properties Of ZnS

Zinc sulfide(ZnS) thin films of different thickness were deposited on corning glass with the substrate kept at room temperature and high vacuum using thermal evaporation technique.the film properties investigated include their absorbance/transmittance/reflectance spectra,band gap,refractive index,extinction coefficient,complex dielectric constant and thickness.The films were found to exhibt high transmittance(59-98%) ,low absorbance and low reflectance in the visible/near infrared region up to 900 nm..However, the absorbance of the films were found to be high in the ultra violet region with peak around 360 nm.The thickness(using optical interference fringes method) of various films thichness(100,200,300,and 400) nm.The band gap measured was found to be in the range (3.52 -3.78 )eV

Influence of Josephson current second harmonic on stability of magnetic flux in long junctions

We study the long Josephson junction (LJJ) model which takes into account the second harmonic of the Fourier expansion of Josephson current. The dependence of the static magnetic flux distributions on parameters of the model are investigated numerically. Stability of the static solutions is checked by the sign of the smallest eigenvalue of the associated Sturm-Liouville problem. New solutions which do not exist in the traditional model, have been found. Investigation of the influence of second harmonic on the stability of magnetic flux distributions for main solutions is performed.Comment: 4 pages, 6 figures, to be published in Proc. of Dubna-Nano2010, July 5-10, 2010, Russi