In the current work various types of epoxy composites were added to concrete to enhance its effectiveness as a gamma- ray shield. Four epoxy samples of (E/clay/B4C) S1, (E/Mag/B4C) S2, (EPIL) S3 and (Ep) S4 were used in a comparative study of gamma radiation attenuation properties of these shields that calculating using Mont Carlo code (MCNP-5). Adopting Win X-com software and Artificial Neural Network (ANN), µ/ρ revealed great compliance with MCNP-5. By applying (µ/ρ) output for gamma at different energies, HVL, TVL and MFP have been also estimated. ANN technique was simulated to estimate (µ/ρ) and dose rates. According to the results, µ/ρ of all epoxy samples scored higher than standard concrete. Both S2 and S3 samples having higher values of µ/ρ, show minimum dose rate values. (µ/ρ) and RPE% values were enhanced, the concrete containing E/Mag/B4C (S2) had the best results, while the concrete containing Ep (S4) provide the worst results. The ANN prediction results take 15 sec for estimating gamma doses corresponding to seventeen shield thicknesses, while the theoretical MCNP-5 results took approximately between 7 to 10 hours for five gamma doses. ANN provides excellent predictions with a high degree of correlation depending on increasing the number of attenuation parameters used in the training process. Also, it predicts gamma dose rates for a large number of shield thicknesses that cannot be calculated theoretically in a very short time. This supports, the created epoxy composite offers good attenuation properties for many shielding applications and could be proposed as an injecting mortar for cracks in biological shields and the walls of diagnostic and radiotherapy rooms. However, further investigations are planned for different filler ratios, for comparison purposes, in order to reach optimal shielding properties
NeighShrink is an efficient image denoising algorithm based on the discrete wavelet
transform (DWT). Its disadvantage is to use a suboptimal universal threshold and identical
neighbouring window size in all wavelet subbands. Dengwen and Wengang proposed an
improved method, which can determine an optimal threshold and neighbouring window size
for every subband by the Stein’s unbiased risk estimate (SURE). Its denoising performance is
considerably superior to NeighShrink and also outperforms SURE-LET, which is an up-todate
denoising algorithm based on the SURE. In this paper different wavelet transform
families are used with this improved method, the results show that Haar wavelet has the
lowest performance among
The phenomenon of black money laundering (money laundering) receives wide and great attention from researchers of all their intellectual orientations, legal or economists, as this process acquires great importance in light of commercial developments and electronic transactions, Especially after the opening of Iraq to the outside world after 2003, and there are many factors that encourage the process of money laundering, including the large number of crimes, the prevalence of financial and administrative corruption, and the weakness of legal procedures to combat it, as the phenomenon of black money laundering is considered a criminal case that affects developed and developing countries. Because it impedes the tracking and seizure of funds
... Show MoreThis paper deals with defining Burr-XII, and how to obtain its p.d.f., and CDF, since this distribution is one of failure distribution which is compound distribution from two failure models which are Gamma model and weibull model. Some equipment may have many important parts and the probability distributions representing which may be of different types, so found that Burr by its different compound formulas is the best model to be studied, and estimated its parameter to compute the mean time to failure rate. Here Burr-XII rather than other models is consider because it is used to model a wide variety of phenomena including crop prices, household income, option market price distributions, risk and travel time. It has two shape-parame
... Show MoreAcquisition provisions in Islamic jurisprudence
Thermal conductivity for epoxy composites filled with Al2O3 and Fe2O3 are
calculated, it found that increasing the weight ratio of Al2O3 and Fe2O3 lead to
increase in the values of thermal conductivity, but the epoxy composite filled with
Fe2O3, have values of thermal conductivity less than for epoxy composite filled with
Al2O3, for the same weight ratio. Also thermal conductivity calculated for epoxy
composites by contact to every two specimens (like sandwich) content same weight
ratio of alumina-oxide and ferrite-oxide, its found that the value of thermal
conductivity lays between the values of epoxy filled Al2O3 and of epoxy filled Fe2O3
Undue influence is considered as a vitiating factor or defect in English law. It is a dominating influence, with which the ascending party enjoys, and which enables him to exert an illegitimate pressure on the unduly influenced weaker party, in order to induce, or force him, to conclude a contract and enter into a transaction, against his will. It is also worth-bearing in mind that the doctrine of undue influence is an equitable one, originating from the rules of equity, applied by English courts of equity, and by which these courts set aside unconscionable bargains, in which one party is in a position to exploit the weakness of the other. It is also worth-mentioning that this doctrine has been included in the English common law. W
... Show MoreIn the current study, the researchers have been obtained Bayes estimators for the shape and scale parameters of Gamma distribution under the precautionary loss function, assuming the priors, represented by Gamma and Exponential priors for the shape and scale parameters respectively. Moment, Maximum likelihood estimators and Lindley’s approximation have been used effectively in Bayesian estimation.
Based on Monte Carlo simulation method, those estimators are compared depending on the mean squared errors (MSE’s). The results show that, the performance of Bayes estimator under precautionary loss function with Gamma and Exponential priors is better than other estimates in all cases.
This study aims to Statement of the relationship between Total Quality Management philosophy and Organizational performance from the point of view of the internal customer. A comparison has been made between two companies, one of which applies the requirements of TQM well and the other does not apply these requirements as the (General Company for Electrical Industries/ Diyala) and (General Company for Electrical Industries/ Baghdad) to conduct the search, During the questionnaire prepared for this purpose and distributed to a sample of 30 employees in the General Company for Electric Industries/ Diyala and (20) employees of the General Company for Electrical Industries/ Baghdad. Their answers were analyzed using a simple correlation coef
... Show MoreThe labor inspector may be exposed - while performing his duties that are legally assigned to him - to threats or attacks on him by employers, which makes it impossible for the inspector to perform these jobs.
This has prompted international and Arab labor inspection standards, as well as national labor laws, to emphasize the need to provide security support and legal protection for the labor inspector, and to punish employers' violators, with the aim of extending the authority and prestige of the state and ensuring the enforcement of laws and thus achieving the goals for which it was legislated.
The majority of constitutions stipulate and regulate public rights and freedoms in them, including the right to strike as one of the means of expressing an opinion, which public officials or workers resort to in the labor law in order to improve their working conditions and achieve legitimate professional demands while continuing the work of the public facility, However, his capacity as a public servant imposes some restrictions on him in his exercise of political freedoms, including the right to strike because it intersects with the principle of the continuation of the regular and steady functioning of public utilities, which governs the work of public utilities in satisfying the public needs of individuals. The Iraqi legislator permitt
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