f. ebrahimi

Most daily activities need using hands and fingers dexterously. Hand prostheses in disabled people can be controlled using surface Electromyography (sEMG) signals acquired non-invasively by means of surface electrodes connected to superior limbs. After preprocessing 12 electrodes sEMG signals acquired from 10 amputees, different features in time and frequency domains were computed. Considering sEMG as a complex, random, non-stationary, and nonlinear signal a complex nonlinear feature was also extracted by the method of multifractal detrended fluctuation analysis (MFDFA). Different classification methods including support vector machine (SVM), linear discriminant analysis (LDA), and Multi-Layer Perceptron (MLP) were used to compare their performance in the classification of eight different finger movements. It was observed that the SVM performed better than the two other classifiers in finger movement classification. The best classification accuracy, precision, and recall (sensitivity), by the fusion of the new and traditional features were 98.70%, 98.74%, and 98.67%, respectively. Results showed that addition of the new feature extracted by MFDFA and other traditional features was effective in improving the data acquisitions.

The prediction of a Sudden Cardiac Death (SCD) long enough before its occurrence is vital for cases outside the hospital. This study investigate the effect of the simultaneous application of Electrocardiogram (ECG) and Heart Rate Variability (HRV) signals in the SCD prediction 60 minutes before its incidence. To do so, first, the SCD prediction was performed in each of the one-minute intervals by different groups of linear and nonlinear ECG and HRV features using the Support Vector Machine (SVM) classifier. The results showed that the best accuracy for SCD prediction was 91.23%. Next, all features were ranked locally in each of the one-minute intervals before the incidence of the death using the Minimum Redundancy and Maximum Relevancy (MRMR) method. Then, the SCD was predicted by applying four top local features from the ECG and HRV signals in each one-minute interval an hour before the death, showing a mean accuracy and sensitivity of 99% and 98.76%, respectively. Finally, by selecting the four most effective features according to the number of times they have been chosen in all one-minute intervals, the mean accuracy and sensitivity of SCD prediction were calculated at 96.15% and 95.07%, respectively. Additionally, since there is a similarity between the ECG signal of the pre-SCD and the Congestive Heart Failure (CHF), the classification of the Normal, CHF, and pre-SCD was performed, indicating a mean accuracy of 79.7%; it was also discovered that the Normal data could be separated from the SCD and CHF data with higher accuracy.

Persian poetry is very rich in the field of romantic issues. Many poets have repeatedly dealt with romantic themes and representation of the relationship between two lovers and the beloved, among which we can mention the stories of Zal and Rudabe, Bijan and Manijeh, Siavash and Sudaba. One of Ferdowsi's innovations has been that during the stories that have an epic and romantic structure, he spoke about moral and human-building teachings and strengthened his speech from the epistemological dimension. The goal and problem in this research, which was written with reference to library sources and descriptive-analytical method, was to represent the ethical approaches of poets while dealing with other issues, to show that the one-dimensional view and single naming The aspect of prominent works such as Shahnameh is not very acceptable and can be cited, and this should be reconsidered. Also, ethics is a dominant phenomenon and a fluid flow in the Shahnameh, and this shows Ferdowsi's ethicist mentality.

It seems that in the story of Zal and Rudabe, shame and in the story of Bijan and Manijeh, the spirit of philanthropy and in the story of Siavash and Soudabeh, not giving in to the illegitimate demands of others were among the main moral teachings. Is. Also, Siavash's character can be considered as a behavioral and moral model and Sudabah as an anti-ethical character. The most important moral teachings in these stories are: "altruism and the priority of group interests over personal desire", "shame and modesty", "avoiding harassment of others", "avoiding cheating". and lust and lies", "Priority of dialogue culture over war-mongering and conflict

One of the systems resistant from to lateral load is the flexible from. The joints of the flexible frame are designed as rigids in these flexible frames, the purpose of the design is so that the plastic joint is removed from the connection point and placed on the beam. For this purpose and create a plastic joint in the beam, systems such as Reduce section are used.by weakening the beam in the critical area, causes the plastic joint to come out of the connection point on the beam. In this article, a replaceable connection has been achieved by using the Reduced section method and the patch system with up and underskirt sheets. That many problems in the reduced section have been solved and the behavior of the system has been improved. By using replaceable system, the structure has been repaired at a high speed after the earthquake and also its cost is very low. In this article, eight models have been evaluated numerically with Abaqus finite element software. Good results have been achieved by examining the cyclical and functional diagrams obtained from the models. In addition to the fact that the plastic joint has been removed from the connection point and placed on the beam, the possibility of being replaceable has also been added to the designed model, which has improved the problems to some extent

Mishan Formation with a thickness of 395 meter which is composed of limestone, marly limestone and marl and early to middle Miocene age (Burdigalian-Langhian), has been measured and sampled in order to study the sedimentary environment and sequense stratigraphy in Bavarian stratigraphic section in the south of Kavar, Fars province. The Mishan Formation is located on the red evaporative and clastic sequence succession of the Razak Formation and under the clastic and carbonate succession of Agha Jari Formation (Miocene-Pliocene age). Based on the characteristics of petrographic features, field evidence, as well as examining the abundance and distribution of foraminifera and other other allochems and orthochems, eighteen microfacies packages were identified in six sub-environments or sedimentary zones (Facies zones) including tidal flat, lagoon, shoal, pach reef, shallow and deep open marine can be placed. The absence of barrier reefs (which are typical of rimmed platforms) and re-deposited carbonates and also gradual conversion of microfacies into each other and the existence of wide areas of tidal, indicate that the sedimentary sequence in this section was deposited on a homoclinal ramp carbonate platform. The sedimentation of limestone-marl deposits of Mishan Formation on the evaporite-clastic sedimentary rocks of Razak Formation, indicate the last transsgresion of the sea water during the Miocene age of the Zagros Basin. The investigation of the sequence stratigraphy of this Formation in the research section has led to the identification of four third-order sedimentary sequences with sequence boundaries of the second type.

The ability of phenological adjustment and accelerate maturation is one of the most drought tolerance mechanisms in crops. Tall fescue is one of the valuable forage and turf grasses that is used to prevent soil erosion and produce forage in pastures and is compatible with most soils and climates. In this research, yield potential and genetic variation of three phenological groups including mid-flowering group (parental group), early and late flowering groups each containing 25 genotypes, selected from a poly cross community, were studied under non-stress and water deficit conditions in the research farm of Isfahan University of Technology for two years. Irrigation was applied when 90 and 50% of available soil water were depleted for stress and normal environments, respectively. The results showed that there was considerable variation in the studied germplasms in terms of all studied traits and responses to water deficit stress. The highest value of genetic variation belonged to forage yield. The results showed that dry forage yield in the first and second harvest stress decreased by 17% and 52% due to water deficit, respectively. The highest estimate of heritability was related to the trait of day to anthesis and the lowest was related to the percentage of dry matter and forage yield. The results showed that the highest dry forage yield under non-stress conditions belonged to the late flowering group. Means comparison of genotypes showed that the highest dry forage yield under normal and water stress belonged to genotypes 10 (from America with 209.50 g/plant) and 3 (from Yasouj with 142.25 g/plant), respectively, in the late flowering group, genotypes 25 (from Shahrood with 383 g/plant) and 22 (from Poland with 178.50 g/plant), respectively in early flowering group and genotypes 25 (from Shahrood) with 222.50 and 182.25 g/plant in the parental group, respectively. The results indicate that the studied genotypes may have incomplete summer dormancy that should be investigated in future studies. Considerable genetic diversity between and within phenological groups and their different responses to drought stress can be used to develop and produce suitable synthetic varieties for soils with limited water resources.

Sorghum is of the most important forage plants with high production potential, the ability to grow in areas with poor soil, and high adaptation to stresses. To assess the effect of water deficit stress, the production potential and the relationship between important traits, 36 forage sorghum cultivars were studied under water deficit condition using a 6×6 Lattice design at the research farm of Shahid Bahonar University of Kerman in May, 2020. Water deficit was applied at the beginning of heading stage by irrigating at 85% depletion of soil available water. The non-stress conditions consisted of irrigation when 50% of the total available water was depleted from the root zone. The ANOVA showed that water deficit significantly reduced fresh forage yield and plant height by 44.80 and 18.28%, respectively. Cultivars unl Hybrid3, Wray, Speed Feed, and Smith had the highest fresh forage yields in both moisture conditions. Mean comparisons of MP, YI, GMP, and STI indices and principal component analysis for different indices showed that unl Hybrid3, Speed Feed, Wray, Smith, ICSV 25264, and Dale were as tolerant and high yielding cultivars in both moisture conditions. Based on the results of path analysis, plant height and stem diameter had the most direct effect on fresh forage yield under non-stress and water stress conditions, respectively. They had the most indirect effect on sorghum fresh forage yield through stem diameter and plant height, respectively. It may be concluded that water stress at the reproductive growth stage significantly reduced the growth and forage yield of sorghum. However, sufficient variation in the studied germplasm suggested the possibility of selection for more tolerant cultivars. The more tolerant cultivars with high yield potential in the studied germplasm may be proposed for cultivation in regions with limited water resources and traits identified effective on yield increase are suggested for breeding objectives.

One of the key parameters in climate change is Precipitable Water Vapor (PWV) which plays an important role in identifying precipitation distribution, hydrological cycles and important meteorological and climatic phenomena. Therefore, it is important to study the long-term changes in PWV time series in an area. MODIS near-infrared PWV product (MOD-NIR-PWV) provides a suitable spatial coverage of PWV with a resolution of 1 km and temporal resolution of 1 day. This study compares statistically the time series of MODIS PWV from 2000 to 2018 with radiosonde values. MODIS data under cloudless conditions at a maximum distance of 1 km from the position of the radiosonde station were used for statistical analysis. The results show that the consistency between two sets of water vapor data in terms of correlation coefficient was obtained at 0.81, 0.78 and 0.67 in Tehran, Isfahan and Mashhad stations, respectively. Also, the linear trend of PWV time series in the study areas was investigated using Mann-Kendall (MK) statistical test. PWV values in both datasets have undergone similar trends, according to time series analysis of radiosonde and MODIS. Therefore, free remote sensing methods such as MODIS products along with local data can be used for long-term studies of PWV to study the trends of the PWV parameter. Furthermore, a decrease in precipitation and an increase in surface temperature along with an increase in the PWV value of MODIS data was observed in studies with synoptic data in the studied stations, which may in some way reflect the effects of global warming in the studied stations.

The present article express the magneto thermo electric deformation of composite nano fiber reinforced by graphene oxide powder (GOP). To reach the governing equation of the problem a higher-order trigonometric refined beam model is utilized according to Hamilton’s principle. The effect of a nonuniform magnetic and  thermo piezo electric field is applied to the governing equations by combining the field relations with the displacement field equations. Then, obtained equations are solved by using Galerkin’s method to consider the influence of different boundary conditions on the vibrational responses of the fiber. The accuracy and efficiency of the presented model is verified by comparing the results with that of published researches. Further, the effects of different variant on the dimensionless frequency of GOP reinforced magneto piezo thermo elastic composite fibers are highlighted through tables and dispersion curves. The weight fraction of GOP and the magneto thermo electro effects have significant influence in the stiffness of the nano composites.

In this paper we discuss the effect of silica filler content on zinc oxide in curing process and the amount of Zn absorbed in the presence of silica gel in atomic absorption spectroscopy instrument. For this purpose the compounds have been made up of the mixture of stearin-butadiene, butadiene rubbers and other components with different contents of silica. Considering the results from rehometer test and the amount of zinc oxide absorbed in atomic absorption spectroscopy instrument for different amounts of silica, 4 new compounds have been introduced containing different amounts of zinc oxide. After doing some tests like mechanical tests (tensile strength, elongation, stiffness and Abrasion) the new compounds have been added to the solvent mixture for atomic absorption analysis. The results show that the maximum zinc absorption happens with the minimum silica content because a stable complex formed between zinc and silica gel results in preventing zinc oxide from taking part in curing process. Besides that adding the fluoric acid solvent for solving the silica gel will result in considerable increase in Zn absorption. The results of different analysis like mooney, Tension of rubber, hardness, abrasion resistance and Reometer tests show that increasing the silica content causes the curing process be slower and less cross links will be formed because of the increase in the amount of zinc oxide absorbed. In what follows studying the amount of zinc absorbed in atomic absorption spectroscopy instrument will confirm the absorption of zinc oxide by silica and forming a stable complex.

Self-weighting estimation through equal probability selection methods (epsem) is desirable for variance efficiency. Traditionally, the epsem property for (one phase) two stage designs for estimating population-level parameters is realized by using each primary sampling unit (PSU) population count as the measure of size for PSU selection along with equal sample size allocation per PSU under simple random sampling (SRS) of elementary units. However, when self-weighting estimates are desired for parameters corresponding to multiple domains under a pre-specified sample allocation to domains, Folsom, Potter and Williams (1987) showed that a composite measure of size can be used to select PSUs to obtain epsem designs when besides domain-level PSU counts (i.e., distribution of domain population over PSUs), frame-level domain identifiers for elementary units are also assumed to be available. The term depsem-A will be used to denote such (one phase) two stage designs to obtain domain-level epsem estimation. Folsom et al. also considered two phase two stage designs when domain-level PSU counts are unknown, but whole PSU counts are known. For these designs (to be termed depsem-B) with PSUs selected proportional to the usual size measure (i.e., the total PSU count) at the first stage, all elementary units within each selected PSU are first screened for classification into domains in the first phase of data collection before SRS selection at the second stage. Domain-stratified samples are then selected within PSUs with suitably chosen domain sampling rates such that the desired domain sample sizes are achieved and the resulting design is self-weighting. In this paper, we first present a simple justification of composite measures of size for the depsem-A design and of the domain sampling rates for the depsem-B design. Then, for depsem-A and -B designs, we propose generalizations, first to cases where frame-level domain identifiers for elementary units are not available and domain-level PSU counts are only approximately known from alternative sources, and second to cases where PSU size measures are pre-specified based on other practical and desirable considerations of over- and under-sampling of certain domains. We also present a further generalization in the presence of subsampling of elementary units and nonresponse within selected PSUs at the first phase before selecting phase two elementary units from domains within each selected PSU. This final generalization of depsem-B is illustrated for an area sample of housing units.

Soil hydraulic conductivity and water retention curves are the most important factors that effect on water flow in soil. The aim of this study is investigation the effect of land use changing on soil hydraulic properties. Tension disk infiltrometer was used for measurement of in situ soil hydraulic properties. Infiltration experiments were conducted at 3 land uses (including range، Horticulture and Agriculture lands) in 5 tensions (including 0، 3، 6، 10، 18 cm H2O) and 3 replications for each land uses. Horticulture and Agriculture land use have been created of rang land use changing. Hydraulic conductivity and water retention curves were simulated by inverse method using Hydrus 2D software and 3 model of Rosetta، then compaired with observation data. Results showed، SSC+BD is the best model to predicting hydraulic conductivity curve in all 3 land use. Simulation of water retention curve showed، for all 3 models of Rosetta (including Textural class، SSC and SSC+BD)، GMER parameter was less than 1، for therefore، inverse method underestimated the water content. Statistical parameters amount showed، in range land-use textural class model، in horticulture land use SSC model and in agriculture land use SSC+BD model are the best models for simulation retention curve. RMSE and MAE amounts for mentioned land uses and models are 0. 055، 0. 048 (range land use)، 0. 046، 0. 03 (horticulture land use) and 0. 05، 0. 041 (agriculture land use) respectively.

We have performed extensive numerical simulations to estimate the fractal dimension of the mass and also the anisotropy in the shape of sample spanning cluster (SSC) in 2-D site invasion percolation processes with and without trapping. In agreement with the most recent works, we have observed that these two different processes belong to two different universality classes. Furthermore, we have determined for the first time, the degree of anisotropy in the shape of SSC by evaluating its gyration ratio. It is found that despite isotropy of the media and also the dynamics, the shape of invasion percolation clusters are not isotropic. The degree of anisotropy is more for clusters of invasion percolation with trapping. We have also studied the distribution of invaded pore sizes for the two invasion percolation processes.