The effect of temperature, time of curing and Na2O/SiO2 molar ratio on mechanical and chemical properties of geopolymer cement

The geopolymer cement is a suitable alternative material for Portland cement due to their environmental compatibility, low curing temperature, and high strength. In this research, Kaolin was used as a raw material for the construction of a geopolymer cement, while sodium hydroxide was an alkali hydroxide. Kaolin is calcined at 750 °C to obtain meta-kaolin. Geopolymer samples were prepared at various curing temperatures (25, 50, and 75 °C), different curing times (3, 7, 21, 28, and 60 days) and with different activator ratios (0.6-0.9). The thermal analysis of kaolin was done via DTA/TGA. Investigation on the geopolymer cement structure and phases were performed using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and magic angle spinning nuclear magnetic resonance (MAS-NMR). Also, the effects of temperature and time of curing and Na2O/SiO2 molar ratio were studied. The results showed that the maximum compressive strength was 115MPa, which obtained at a molar ratio of Na2O/SiO2=0.9, a curing time of 60 days, and a curing temperature of 75 °C. The microstructure of cement was studied using scanning electron microscopy (SEM)

Examine the Relationship Between Locus of Control and Happiness Male Physical Education and Non Physical Education Teachers in Yazd Province

This study examined the relationship between locus of control and happiness for male physical and non-physical education teachers in Yazd province. A total of 260 teachers (physical education 53 people, non-PE 207) by random sampling, and finally 258 questionnaires were examined. In this study, Pearson correlation method for carrying out the Questionnaire of resources Rotter (short form) and Oxford were used. The results showed a positive relationship between locus of control and happiness (001/0 P =). There is a significant. The findings showed Components of mental health, life satisfaction, self-efficacy and positive role in the happiness of the highest physical and non-physical education teachers have. In addition, the comparative study between the two groups in terms of locus of control, physical education teachers from internal locus of control than non-PE teachers, respectively. Keywords: Happiness, locus of control, physical education teachers, physical education Dbyrghr DOI: 10.7176/RHSS/9-12-13 Publication date:June 30th 201

Genetic algorithms-based quality of service service selection in cloud computing using multilayer perceptron

There exist many similar services by different service providers available within the cloud environment. When the service offerings are packaged with similar functionalities, service consumers will be having a difficult time in evaluating the most relevant services that fit to their individual requirement. To address this issue, this paper proposes an effective services classification in cloud environment, which will classify the equivalent services based on their quality of service (QoS). The attribute selection method is based genetic algorithms (GA) and is designed to rank the cloud services before the attributes are being fed into a multi-layer perceptron (MLP) classification system. The results have shown a considerably high performance of 98.5%

Analgesic Efficacy of Aloe Vera and Green Tea Mouthwash After Periodontal Pocket Reduction Surgery: A Randomized Split-Mouth Clinical Trial

Objectives: The aim of this study was to assess the efficacy of aloe vera and green tea mouthwash for reducing pain after periodontal pocket reduction surgery.Methods: This randomized, split-mouth, double-blind, cross-over clinical trial was carried out on 45 patients between 25 and 50 years of age requiring pocket reduction surgery. Patients underwent bilateral surgeries in two sessions. After the first surgery, the patients were randomized to receive either mouthwash or placebo for 10 days; then, each group used the other product for the same time period. The parameters assessed following each procedure were the numeric pain rating scale (NPRS) and number of painkillers taken by patients to alleviate postoperative pain. Also, patients were requested to report side effects, if any, after using the mouthwash.Results: The reported postoperative pain score was significantly lower after using the aloe vera and green tea mouthwash compared to the placebo only in the first postoperative day (P=0.002). Furthermore, number of analgesic tablets used in the first postoperative day was significantly lower than that in the control group (P=0.007).Conclusion: Our results indicated that patients experienced significantly less early postoperative pain when they used aloe vera and green tea mouthwash. Thus, its application can be recommended to decrease pain after periodontal pocket reduction surgery

Diagnosis of hyperlipidemia in patients based on an artificial neural network with pso algorithm

One of the most common and most dangerous diseases of blood fats are such as heart disease, diabetes and stroke, heart and brain. It can control the timely diagnosis, treatment and then prevention of complications is become very effective even without using medicine. Heart disease and diabetes file if patients has useful information that can be used to estimate blood fat timely diagnosis. In this paper we introduce a method based on data mining according to the information of patients' medical records to predict and detect blood lipid cardiovascular. And to identify patients with high blood lipids,we use a category based on neural network without feedback and pso algorithm to train the neural network to determine the appropriate value to reduce error the weights of the neural network . Simulation is done in MATLAB environment by using Body Fat data set, it shows the accuracy of 93.22 percent compared to the same methods, which means high accurate, higher detection sensitivity and Democrats

GA-based feature subset selection in a spam/non-spam detection system

Spam has created a significant security problem for computer users everywhere. Spammers take an advantage of defrauds to cover parts of messages that can be used for identification of spam. For instance, a spammer does not need to consume much cost and bandwidth for sending junk mails even more than one hundred emails. On the other hand, from the feature selection perspective, one of the specific problems that decrease accuracy of spam and non-spam emails classification is high data dimensionality. Therefore, the reduction of dimensionality is related to decrease the number of irrelevant features. In this paper, a genetic algorithm (GA) is applied during feature selection in effort to decrease the number of useless features in a collection of high-dimensional email body and subject. Next, a Multi-Layer Perceptron (MLP) is employed to classify features that have been selected by the GA. Using LingSpam benchmark corpora as the dataset, the experimental results showed that a GA feature selector with the MLP classifier does not only decrease the data dimensionality but increase the spam detection rate as compared against other classifiers such as SVM and Naïve Bayes

Vent-proximal sub-seafloor replacement clastic-carbonate hosted SEDEX-type mineralization in the Mehdiabad world-class Zn-Pb-Ba-(Cu-Ag) deposit, southern Yazd Basin, Iran

© 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/The Mehdiabad Zn-Pb-Ba (Cu-Ag) deposit in the southern Yazd Basin, central Iran, is the largest sediment-hosted Zn-Pb deposit in Iran. This deposit is hosted by organic carbon matter-rich shale, fine-grained black siltstone, and dolomite interlayered with sandstone of the Taft Formation. Sedimentological and geochemical studies of the Taft Formation have shown that these organic carbon matter-rich shales formed during a period of basin deepening and under anoxic conditions. Based on the orebody structure, mineralogy, and ore fabrics, we recognize five different ore facies types in the Mehdiabad deposit: (1) a stockwork/feeder zone, consisting of a discordant sulfide mineralization, forming a stockwork of sulfide-bearing dolomite veins, cutting the sedimentary rocks of the footwall; (2) massive-replacement ore, including pervasive replacement carbonate by pyrite, chalcopyrite, galena, and sphalerite with minor barite; (3) a bedded ore, with laminated to disseminated pyrite, sphalerite, and galena; (4) barite ore, which contains accessory sulfide minerals and rare calcite at the top of the deposit, and (5) a distal facies, with minor disseminated and laminated pyrite, banded cherts, and disseminated barite. Two stages of base metal sulfide replacement have separate origins. Fine-grained sulfide bands (stage I), intricately interlayered with organic carbon-rich beds and thin turbidite beds, exhibit lamina and bedding textures, supporting a syn-sedimentary (onto the sea floor) origin. Coarse-grained base metal sulfides (stage II), occurring within breccias and veins to veinlets are considered to have formed by replacement during post sedimentation sub-seafloor fluid flow. d34S values of pyrite, sphalerite chalcopyrite and galena range from -22 to +4.6.8‰. The highest d34S values correspond to the feeder zone (+4.6 and -10.5‰), whereas massive-replacement (+3.7 to -13.7‰) and bedded (-22 to -17‰) ore facies display depleted compositions. The overall range of d34S values is remarkably higher than typical magmatic values, suggesting that sulfides formed from the reduction of seawater sulfate by bacteriogenic sulfate reduction in a closed or semi-closed system in the bedded ore, whereas thermochemical sulfate reduction likely played an important role in the feeder zone. The formation of the Mehdiabad deposit follows the evolution of the sedimentary basin. Abrupt lateral changes in facies and thickness, along with the existence of synsedimentary breccias and debris flows within the ore sequence, suggest the proximity to synsedimentary faults and tectonic activity contemporaneous with the sedimentation in the Lower Cretaceous, favorable for the formation of the ore deposit. The deposit formed from a combination of hydrothermal and syn-sedimentary processes. Sulfur isotopes, together with sedimentological, textural, mineralogical, and geochemical evidences, suggest that this deposit should be classified as a vent-proximal sub-seafloor replacement SEDEX ore deposit.Peer ReviewedPostprint (author's final draft

Corneal topography and higher-order aberrations in patients with type 2 diabetes mellitus

Background: Changes in blood sugar levels cause alterations in the anterior segment and retina of the eye. This study was aimed at evaluating corneal topography, aberrometry, and corneal asphericity in patients with treatment-naive type 2 diabetes mellitus (T2DM). Methods: Participants with treatment-naive T2DM were enrolled in this cross-sectional study. The inclusion criteria were glycated hemoglobin A1c (Hb A1c) greater than or equal to 7.5% and absence of other ocular or systemic diseases. Patients who refused to participate or had a history of topical or systemic steroid use, hyperlipidemia, hypertension, anemia, prior ocular disorder or surgery, diabetic retinopathy, glaucoma, cataract, active ocular inflammatory or infectious disease, or contact lens use were excluded. All participants underwent a comprehensive ophthalmic examination. The Pentacam HR Scheimpflug tomography system (Pentacam High Resolution; Oculus, Wetzlar, Germany) was used to measure the anterior-segment parameters. Results: Sixty eyes of 30 patients with a male-to-female ratio of 1:1 were included; the mean (standard deviation [SD]) age and Hb A1c were 51.63 (6.73) years and 8.82% (1.31%), respectively. The mean (SD) values of central corneal thickness, root mean square (RMS) of total aberration, RMS of lower-order aberrations, RMS of higher-order aberrations, spherical aberration, 0° coma, 90° coma, flat anterior keratometry (K), steep anterior K, mean anterior K, anterior topographic astigmatism, flat posterior K, steep posterior K, mean posterior K, posterior topographic astigmatism, anterior corneal asphericity, and posterior corneal asphericity were 540.22 (24.47) µm, 1.72 (0.73) µm, 1.63 (0.73) µm, 0.51 (0.17) µm, + 0.31 (0.09) µm, - 0.06 (0.15) diopters (D), 0.003 (0.21) D, 43.87 (1.49) D, 44.69 (1.50) D, 44.28 (1.44) D, + 0.82 (0.83) D, - 6.25 (0.27) D, - 6.55 (0.31) D, - 6.40 (0.28) D, - 0.30 (0.15) D, - 0.32 (0.12) Q-value, and - 0.47 (0.17) Q-value, respectively. Conclusions: We presented the mean values of Pentacam parameters for aberrometry, keratometry, and corneal asphericity in patients with treatment-naive T2DM. These values could serve as a baseline for prospective monitoring of the ocular health status of this cohort and for comparison with future cohorts of patients with well-controlled T2DM. Further studies are required to assess the presence and applicability of ocular changes following intensive blood glucose control in T2DM and further understand the related pathophysiology

Mineralization and structural controls of the AB-Bid carbonate-hosted Pb-Zn (±Cu) deposit, Tabas-Posht e Badam Metallogenic Belt, Iran

Peer ReviewedPostprint (published version