Alkali Activated Eco-friendly Metakaolin/Slag Geopolymer Building Bricks

Alkali activation of alumino-silicate materials is a complex chemical process evolving dissolution of raw materials, transportation or orientation and polycondensation of the reaction products. This study explores the physico-mechanical characteristics of geopolymer bricks using eco-friendly slag/metakaolin binder. Alkaline activation of slag – metakaolin binder of geopolymer brick results in formation of C-A-S-H as well as N-A-S-H gel, which adopts different structures depending on the nature of the alkaline activator. Activators used are 10% NaOH solution in addition to 5% liquid sodium silicate both used from the total binder weight), Geopolymer bricks prepared by partial binder substitution of metakaolin (fired kaolin) by water cooled slag in the ratio from 0 up to 100 %, while the used fine sand(passing 1 mm) in the ratio of 15% from the total weight. The properties of the produced geopolymer bricks have been studied through measurement of compressive strength, water absorption, FTIR, XRD and SEM imaging. Results demonstrate the possibility of substitution of metakaolin by water cooled amorphous slag materials in producing geopolymer bricks with superior properties where an increase in mechanical strength with water cooled slag increase up to 40 %  was noticed giving compressive strength values exceed 70 MPa which can be used for production of  heavy duty  bricks which can be applied in a severe weathering condition as well as special purposes building applications, however further increase results in lowering strength values as a  but still exceed 30 MPa after 28 days of hydration. Keywords: slag, metakaolin, bricks, eco-friendly, sustainability

Nutrient Chemo Prevent to Enhance Cancer Prevention: A Review

Introduction: Nutrients Chemoprevention is dietary compounds to reduce the incidence of cancer, and the dietary compounds could be fibers, nutrients, or vitamins.Purpose: the aim of this integrative literature review to determine effect of nutrients chemo-prevents to reduce risk of cancer.Design: integrative literature review.Method: the electronic databases of CINAHL with full text MEDLINE with full text for article published between 2009 and 2014.Finding: most of nutrients chemo prevents reduce risk some type of cancer. Conclusion: review the nutrients chemo prevents enhance cancer prevention and reduce risk of cancer, so all of country's must be educate the people about the important the nutrition to prevent cancer and enhance health care provider to apply this finding when they make education for the patient or clients, and this topic need more study to become evidence based practice. Keywords: Chemo Prevent, Cancer Prevention, Dietary Intake

Selection of productivity improvement techniques via mathematical modeling

This paper presents a new mathematical model to select an optimal combination of productivity improvement techniques. The proposed model of this paper considers four-stage cycle productivity and the productivity is assumed to be a linear function of fifty four improvement techniques. The proposed model of this paper is implemented for a real-world case study of manufacturing plant. The resulted problem is formulated as a mixed integer programming which can be solved for optimality using traditional methods. The preliminary results of the implementation of the proposed model of this paper indicate that the productivity can be improved through a change on equipments and it can be easily applied for both manufacturing and service industries

Computational modeling of sublattice magnetizations of nano-magnetic layered materials

In the present work, we model the salient magnetic properties of the alloy layered ferrimagnetic nanostructures $[Co_{1-c}Gd_c]_{\ell^{\prime}}[Co]_\ell[Co_{1-c}Gd_c]_{\ell^{\prime}}$ between magnetically ordered cobalt leads. The effective field theory (EFT) Ising spin method is used to compute reliable $J_{Co-Co}$ and $J_{Gd-Gd}$ exchange values for the pure cobalt and gadolinium materials in comparison with experimental data. Using the combined EFT and mean field theory (MFT) spin methods, the sublattice magnetizations of the $Co$ and $Gd$ sites on the individual hcp basal planes of the layered nanostructures, are calculated and analyzed. The sublattice magnetizations, effective magnetic moments per site, and compensation characteristics on the individual hcp atomic planes of the embedded nanostructures are presented as a function of temperature and the thicknesses of the layered ferrimagnetic nanostructures, for different stable eutectic concentrations $c\leq$ 0.5. In the absence of first principles calculations for these basic physical variables for the layered nanostructures between cobalt leads, the combined EFT and MFT approach, and appropriate magnetic modeling of the well-defined interfaces of these systems, yield the only available information for them at present. These magnetic variables are necessary for spin dynamic computations, and for the ballistic magnon transport across embedded nanojunctions in magnonics. The model is general, and may applied directly to other composite magnetic elements and embedded nanostructures

The relationship between nonword repetition, root and pattern effects, and vocabulary in Gulf Arabic speaking children

Nonword repetition has received great attention in the last three decades due to its ability to distinguish between the performance of children with language impairment and their typically developing peers and due to its correlation with variety of language abilities, especially vocabulary skills. This study investigates early phonological skills, as represented by nonword repetition (NWR), in TD Gulf Arabic speaking children and those with language impairment and tries to examine findings in relation to two important NWR hypotheses, namely the phonological short term memory account (PSTM, Gathercole& Baddeley, 1990a) and the linguistic account of Snowling, Chiat & Hulme (1991). In the first experiment, a new Arabic word and nonword test (WNRep) was developed and conducted with 44 TD children and a clinical group (CL) that consisted of 15 children with language impairment. The participants’ ages were between two and four years old. The results show that the TD group scored significantly higher than the CL group on the WNRep and across one, two and three syllable words/nonwords and that NWR scores correlated significantly with receptive and expressive vocabulary tests. Apart from its ability to differentiate between TD and those with language impairment, NWR results revealed significant differences in groups’ performance even on one syllable word and nonwords, which differs from findings in other languages. These results raise questions about whether these findings relate to the characteristic root and pattern morphology in Arabic. Therefore, the second experiment in chapter 5 was conducted to investigate the effects of roots and patterns on TD children’s repetition skills and their relation to receptive and expressive vocabulary tests. A root and pattern nonword repetition test (RAP-NWR) was developed to measure this effect. The RAP-NWR consisted of three different types of root and pattern combinations (real root and nonpattern nonwords, real pattern and nonroot nonwords and nonpattern and nonroot nonwords). All 89 participants were TD Gulf Arabic speaking children aged two to seven years old and divided into six age bands. Results showed that these children’s repetitions were sensitive to the presence of roots but not patterns and that RAP-NWR scores were significantly correlated with both vocabulary tests. Findings from both studies show that while phonological storage may explain some of the results of children’s performance on NWR, there are a myriad of phonological and morphological factors that could have significant effects on NWR, such as the effects of roots and patterns, and it seems that roots more important role to play as it roots awareness emerges earlier than pattern awareness. Based on these findings, clinical utility of root and pattern NWR tests is discussed and further investigations of effects of roots and patterns on NWR are recommended