فهرست مطالب s amiri

We introduced Mask R-CNN+CNN as a deep learning model to classify COVID-19 and non-COVID-19 cases. Radiomic features relevant to COVID-19 was presented for Iranian and other nationalities.

Chest CT images from 800 COVID-19 positive and negative patients were studied. The automated volume of the lung and segmentation of COVID-19 lung lesions were implemented using 3D U-net, Capsule network, and Mask R-CNN on annotated CT images. Deep learning models designed were based on Mask R-CNN, CNN, and Mask R-CNN+CNN algorithms to classify COVID-19 cases. We also explored radiomic features relevant to the COVID-19 pandemic in the lungs for chest CT images and implemented random forest (RF), decision tree (DT), and gradient boosting decision tree (GBDT) algorithms on two datasets.

The Mask R-CNN+CNN model demonstrated a higher classification accuracy (96.39 ± 2.94) compared to the Mask R-CNN and CNN models. The RF algorithm had greater power in differentiating relevant COVID-19 radiomic features compared to DT and GBDT, with an accuracy of at least 91 and an AUC of at least 985 in both datasets. We identified six radiomic features that were relevant to the pathological characteristics of COVID-19 positive/negative patients and were common across all datasets.

This study emphasizes the power of Mask R-CNN+CNN with a ResNet-101 backbone as a CNN algorithm that utilizes bounding box offsets output from Mask R-CNN as the input for classifying COVID-19 cases. Radiomic features extracted from lung CT images might aid the diagnosis of COVID-19 in patients at various stages of the disease.

We deal with some effective numerical methods for solving a class of nonlinear singular two-point boundary value Fredholm integro-differential equations. Using an appropriate interpolation and a q-order quadrature rule of integration, the original problem will be approximated by the non-linear finite difference equations and so reduced to a nonlinear algebraic system that can be simply implemented. The convergence properties of the proposed method are discussed, and it is proved that its convergence order will be of O(hmin{ 72 ,q− 12 }). Ample numerical results are addressed to con-firm the expected convergence order as well as the accuracy and efficiency of the proposed method.

The sedimentary succession of Cenomanine-Turonian, which is introduced by Sarvak Formation, is the most important hydrocarbon (reservoir) formation of Abadan plain. Reservoir facies of this formation show variable temporal and spatial distribution in this time period due to tectonic and sedimentary conditions. In this study, using subsurface seismic data and well data (petrophysical logs and core thin sections), and also comparison with surface outcrops data of Izeh zone, facies, sedimentary environments and diagenetic changes of Sarvak Formation have been studied and analyzed in the framework of sequence stratigraphy. Investigation lateral and vertical variations of facies belts and sequences indicated sedimentation of Sarvak Formation on a rimmed carbonate shelf and intra-platform basins. By examining the changes and geometries of sedimentary-seismic facies along with well, paleontological and petrophysical data and comparison with outcrops, four third-order sedimentary sequences have been separated in the Sarvak Formation (Cenomanian – Turonian interval) with an average age of about 4 million year. These sequences include K120, K130, and K135 in the early Cenomanian, mid Cenomanian, and late Cenomanian respectively, and the K140 sequence is in the early to mid-Turonian. This study showed that distribution and migration of system tracts are consistent with the reservoir zones of Sarvak Formation. The best reservoir facies are in Highstad Systems Tract (HST) which are grain-supported, high porosity and permeability and are subjected to diagenetic processes such as dissolution and karstification. The K135 Sequence forms the best hydrocarbon-containing reservoir facies of shoal, rudist, and channel type in the area.

This study examined the effect of adding selenium to levothyroxine on controlling  primary overt hypothyroidism and reducing the serum level of thyroid peroxidase antibody.

This study was a double-blind, randomized clinical trial on individuals with primary autoimmune hypothyroidism. The patients were randomly divided into two intervention (I) and control (C) groups. Group I was treated with levothyroxine plus selenium, and Group C was treated with levothyroxine alone for three months. The anti-TPO antibody titer and serum levels of TSH, T3, and T4 were measured before and after treatment. Individuals were matched according to the season of visit and body mass index.

Fifty-three persons with a mean age of 33 years (10% male) participated in this study. Twenty-one individuals in Group I and twenty individuals in Group C completed the study. There was no significant difference between the two groups regarding age and gender. In none of the groups, anti-TPO antibody titer did not change significantly before and after the intervention. The serum level of the antibody did not differ significantly between the two groups before and after the study. Following the treatment, Group C was euthyroid; however, the intervention group, despite a decrease in TSH and an increase in T3 and T4, was not euthyroid. The participants reported no side effects.

In this study, adding selenium to levothyroxine sodium did not significantly change the serum level of anti-TPO, TSH, T3, and T4 in the patients with overt primary hypothyroidism.

This study aimed to formulate a philosophical model of rationalism based on the three axes of thought, speech and behavior for the students of the philosophy of education. The study used a qualitative method to analyze the content of a collection of books, commentaries and articles on philosophy from the perspective of rationalism in three parts: thought, behavior and speech. Findings obtained in qualitative content analysis were compiled in the form of a researcher-made questionnaire and was given to a predetermined statistical population including experts in the field of education. The face of the researcher-made questionnaire was confirmed. The data were analyzed by descriptive and inferential statistical methods (SPSS and Smart PLS). Findings of the qualitative part showed that the final model from the perspective of rationalism based on rational and logical principles in thought, behavior and speech for students of philosophy of education consisted of five indicators of goals, methods, challenges and gaps, elements and the consequences. The output of the qualitative stage of the final model from the point of view of rationalism, relying on rational and logical principles in thought, behavior and speech, also included the dimensions, factors and components of the model along with their factor loadings. Also, factor analysis in the quantitative part showed that each of these variables had acceptable fitting indices.

This paper presents an E-ring shaped printed monopole antenna for UWB applications with dual notched bands performance. In order to generate single frequency band notch function, we applied a U-ring shaped monopole antenna, and by inserting a rectangular ring in the centre of it an E-ring shaped radiating patch created and a dual band-notch function can be achieved. The measured bandwidth of the proposed antenna is from 2.75 GHz to 11.43 GHz (110%) for VSWR < 2. The proposed antenna offers two notched bands, covering all the 5.2/5.8GHz of WLAN, 3.5/5.5 GHz of WiMAX and 4-GHz of C bands ranges. Good radiation behavior within the UWB frequency range has been obtained. The antenna has a small dimension of 10 *17 mm2.

In the present study, the feasibility of implementing the shallow tunneling method (STM) for the Abshenasan (Z6) subway station construction in geological conditions of Tehran's alluvium was conducted numerically based on the evaluation of deformation and subsidence of the ground surface. The numerical modeling process was performed in three-dimensional method using Plaxis finite element software. The results obtained from numerical modeling using the STM method show a significant reduction in the deformation and surface subsidence compared to the traditional pile and rib method. So that the maximum subsidence estimated at ground level is about 6.09 mm and is related to the front of the face excavation. This amount of deformation and displacement behind the face excavation was recorded at a distance of approximately one times the width of the station at about 3.52 mm. In fact, with the implementation of the STM method for the Z6 station, the deformation and displacement of the ground occurred at a lower rate than the pile and rib method, resulting in a reduction of maximum subsidence in the ground surface.

Fascioliasis is an emerging and important food and water-borne disease in human communities which has become one of the most important health challenges in countries, like Iran. It causes weight loss, a decrease in feed conversion ratio as well as milk and meat production, and also reduces fertility in animals the prevalence of fasciolosis is increasing in some regions of the world due to various factors. Different methods have been used for the detection of Fasciola hepatica in animals. This study is the first to detect F. hepatica in Lori sheep using polymerase chain reaction (PCR) and conventional diagnostic methods in Western Iran. During three months, 195 fecal samples were collected from sheep in Lorestan province, Iran, using the stratified random sampling method. The conventional diagnostic methods, including wet mount microscopic examination and concentration assays, as well as the PCR technique targeting the intergenic spacer gene of F. hepatica, were used for the detection of the parasite in sheep. In total, 4 (2.1%) out of 195 examined stool samples were positive for F. hepatica based on the conventional assays. The PCR test was positive for F. hepatica in7 (3.6%) samples of 195 studied specimens. Statistical analyses of the data revealed that there is a significant difference between the results of diagnostic methods for F. hepatica detection (P=0.0421). Finally, the results showed that PCR has more diagnostic sensitivity, compared to conventional diagnostic methods, including the concentration techniques and microscopic examination. Hence, it can be advised to use PCR for the detection of F. hepatica in sheep.

Identification of the scour pattern around bridge piers is one of the most important issues in optimized designing of such structures. In this study, for the first time, the scour pattern around twin bridge piers was predicted using an optimized hybrid algorithm. The hybrid algorithm (ANFIS-FA) was developed through combining the Adaptive Neuro-Fuzzy Inference System (ANFIS) and the Firefly algorithm (FA). The ANFIS system is often used with a Takagi-Sugeno-Kang (TSK) fuzzy system. The FA has the ability to find optimized values for non-linear problems (e.g. scour depth). This method has a more accurate search procedure than most optimization methods. Due to its high convergence rate and successful applications in various optimization problems, we decided to employ it for this research. Its high convergence rate causes to reduce computation volume as well as reaching to a convergent response in a small number of iterations. After that, four ANFIS and ANFIS-FA models were introduced by means of parameters affecting the scour depth around twin piers. In order to evaluate the accuracy of soft computing models, the Monte Carlo simulations were employed. In addition, the validation of the numerical models was carried out by the k-fold cross validation approach with k=5. In this study, the experimental data obtained by Wang et al. (2016) were used for validating the results of the numerical models. Their experimental model consists of a rectangular channel with a length of 12m, the width of 0.42 and the height of 0.7m. They installed two abutments to report the scour amount around them. It is worth noting that the initial depth of the sediment layer in this experimental study is 15cm, its length is 6m, and the twin abutments were placed with the distance d from each other in the middle of the sediment layer. Based on the modeling results, the analysis of the results indicated that ANFIS-FA models are more accurate than ANFIS models. Then, the superior model was introduced through conducting a sensitivity analysis. The superior model is a function of all input parameters. This model estimated scour values with reasonable accuracy. For example, the values of R2, MAPE and RMSE were calculated 0.991, 5.876 and 0.015, respectively. Furthermore, the error distribution results showed that about 66% of the superior model results have an error less than 5%. Next, the Froude number was detected as the most effective input parameter for estimating the scour hole around twin bridge piers. Finally, by conducting an uncertainty analysis, it was concluded that the superior model has an overestimated performance.

In the present work, the triple and double differential cross sections of atomic hydrogen ionization in the collision with protons at intermediate and high energy ranges are calculated. Interaction potentials were considered as Coulomb form and the calculations of the triple differential cross section have been performed entirely analytically by using the first-order Born-Faddeev approximation. The triple differential cross sections at different energies and momentum transfers are compared with the first Born approximation results. Finally, the results of the double differential cross section have been obtained by this approximation are compared with experiment and available theoretical results.

Microalgae are considered to be functional foods due to their unique bioactive compounds. Dunaliella salina is a single-celled green alga that lives in coastal waters, brackish waters, and rocky parts of ocean waters. This marine microalga contains beta-carotene pigment, phycocyanin, polysaccharides, iron, and zinc. Dunaliella salina is most important because of its high ability to collect various levels of beta-carotene. Beta-carotene of Dunaliella salina is currently widely used in the food and pharmaceutical industries. Feeding alkaline algae due to the presence of vitamins C and E and large amounts of beta-carotene increase the activity of complement and lysozyme, and ultimately increases the body's immune system. Also, the high level of protein and its usability has made algae a valuable source of protein. The price of the cultivation medium is one of the important factors affecting the final price of the biotechnological product. Whey is used as a culture medium for the cultivation of microorganisms, such as bacteria and algae, due to water-soluble proteins, minerals, organic acids, and vitamins. Regarding the high cost of culture medium used for microalgae cultivation, the aim of this study was to determine the feasibility of Dunaliella salina microalgae cultivation in whey as a cultivation medium and to study its biomass production.

In this research, the effect of different ratios of whey and Walne medium on the biomass production of Dunaliella salina and biochemical properties including total phenolic compounds, total flavonoid, soluble sugars and antioxidant activity were studied. For this purpose, three factors including the concentration of Walne medium (0, 25 and 50 μl), whey (0, 2.5 and 5%), and incubation time (0, 7 and 14 days) were studied using the response surface methodology in a Box-Behnken design with 17 samples. After collecting the data, a second-order model was used for fitting and regression analysis at α = 0.05. Finally, the optimal conditions were determined using numerical optimization and based on the desirability function. Statistical analysis was done with Design-Expert 17. For the cultivation of Dunaliella salina microalgae, 20 ml of algal suspension was added to 100 ml of mixed medium with various concentrations of Walne medium and whey in a sterile condition. The pH of the culture medium was adjusted to 5.7 by 6N HCl and NaOH. In order to create an ideal growth condition, the salinity of the culture medium was constant. The incubation temperature was 25◦C and light intensity was 2500 lux. The samples were kept in the same conditions for 14 days and the air pump was used to prepare aerobic condition for the samples.

The results showed that with increasing whey content as well as Walne medium, cell density and flavonoids increased, which it was statistically significant (P<0.05). The results showed that the incubation time had a significant effect on cell density, antioxidant activity and soluble sugar (P<0.05), and cell density, antioxidant activity, soluble sugar, and amount of flavonoid decreased by increasing the incubation time. Also by increasing the percentage of whey and incubation time, the amount of soluble sugar decreased significantly at the end of incubation time (P<0.05). With increasing whey, total phenol content was not significantly decreased and soluble sugar content remained constant (P<0.05). By increasing the concentration of Walne medium and the incubation time, the antioxidant activity and soluble sugar decreased significantly (P<0.05). Minerals of whey such as calcium, phosphorus, magnesium, zinc, sodium and potassium are present in some of the chemical compounds of the Walne medium. As well as, whey contains a variety of water-soluble vitamins such as vitamins B12, B6, B5, B2, Acid folic acid and ascorbic acid which are essential to grow of Dunaliella salina and caused to increase its cell density. Sala et al. (2016) investigated the effect of whey protein concentrate on Spirulina platensis algae, and concluded that the use of whey protein concentrates in algae cultivation media increased the cell density (biomass) of Spirulina platensis. Generally, the changes in the antioxidant activity of Dunaliella salina cells depend on the concentration of nitrogen and NaCl sources. Also, the antioxidant level in Dunaliella salina increases with low nitrogen levels and high NaCl concentration and high light intensity. Therefore, due to the low nitrogen sources in this study, the antioxidant activity was decreased. Most algae increase the production of phenolic compounds under the environmental stress. Since this research has tried to minimize the environmental stresses in Dunaliella salina cultivation medium, it has reduced the production of phenolic compounds. Also, because phenolic compounds are produced at low temperatures, and the applied temperature to the growth of Dunaliella salina in this study was high which caused to reduce the amount of phenolic compounds. According to the literature, dilution of nutrients in Zarrouk medium and the addition of whey protein concentrate with high levels of lactose and low level of phosphorus, potassium and iron increase carbohydrate production in Spirulina platensis. So, the nitrogen concentration in the cultivation medium is a main factor that affecting the accumulation of carbohydrates in microalgae.

The optimum conditions were obtained at day 5 of incubation time, 5% whey and 0% of Walne medium. Based on the results of this study, the use of whey as a medium for cultivating Dunaliella salina microalgae has been successful.

The emergence of some prominent political, economic, social, and biological crises plays a vital role in changing the behavior of human society. In this regard, the preventive and controlling actions of the Corona crisis, which require a comprehensive, systematic and multidimensional approach, have led to changes in consumers’ purchasing behavior. What is important in this regard is the need to use an interdisciplinary perspective (economics, management, marketing, psychology and sociology) to understand this complex phenomenon. To this end, this article has been conducted using a qualitative approach and with the aim of modeling consumer purchasing behavior in the condition of the Corona virus (COVID-19) crisis, with a multidimensional approach. The methods include of: review of specialized databases, observation, and in-depth interviews with 28 key informants that validity and reliability of them had been confirmed, were used for data gathering. Results showed that the predictive model of the demand situation for Corona's post-crisis goods or services depends on 3 indicators: "the nature of the good or service" and "the level of human interaction in exchange" as well as "income level". Moreover, complete deletion; delayed purchase; purchase substitution; and the relative decline in purchases are the four behavioral categories that consumers adopt during the Corona Crisis, and this model depends on a variety of variables. Finally, the necessary recommendations, with an approach influenced by different areas of knowledge, were presented in the form of a model during the Corona crisis in line with changes in the marketing mix (4P).

The aim of this research was to assess the effect of fat type and concentration as well as the continuous phase viscosity on the rheological properties of an oil-in-water (O/W) emulsion. Thus, sunflower oil and tallow fat were used as the dispersed phase of the emulsion both at 10 and 50% (w/v) and CMC solutions (at 0.1, 0.3 and 0.5% w/v) were acted as the continuous phase. CMC solutions and emulsions showed a shear-thinning behavior with increasing CMC or dispersed phase concentration. The rheological behavior of all samples was well modeled by Herschel-Bulkley, Power law and Casson equations. According to Herschel-Bulkley and Power law models, an increase in the consistency index and a decrease in the flow behavior index of all samples was occurred with increasing CMC concentration (0.1 to 0.5%), fat concentration (10 to 50%) and dispersed phase change from liquid oil to a solid fat. The obtained data were compared with Einstein, Larson, Pal and Dougherty-Krieger predicting models and the results showed that Larson model well described the flow behavior of emulsions with 10% fat content, and Dougherty and Krieger or Pal equations were fitted more with the experimental data of emulsions containing 50% fat content.

Although polychaetes are the most abundant organisms in marine ecosystems, still their genetic diversity is understood inadequately. In this study, molecular identification of Nereididae polychaetes was performed by sequencing a segment of mitochondrial COI gene, isolated from mitochondrial DNA, and comparing nucleotide divergence, Molecular taxonomy, interspecific and intraspecific relations of Nereid species among 4 intertidal stations assigned in Persian Gulf of Iran. Analysis of 109 identified specimens, revealed 78 provisional gene sequences, related to 9 species and 6 genera, in which interspecific divergence was 1.4 times higher than intraspecific divergence (2.82% versus 1.95%). The average pairwise sequence divergence for all sequences was estimated at 1.37%. In three cases maximum divergence within a lineage exceeded the minimum nearest-neighbor distance: Perinereis sp., Platynereis sp. and Platynereis bicanaliculata. Maximum species similarity was observed amongst 3 sampling sites assigned in Bushehr Province whilst Bandar Abbas`s specimens showed less similarity to Bushehr station. Out of the 109 COI gene sequences of Nereididae polychaetes in this study, 34 contained multiple lineages. These results support the assertion that many Nereid populations in the Persian Gulf previously thought of as a single species, actually consist of two or more divergent lineages.

In the present work, the triple and double cross sections of atomic hydrogen ionization in collision with the proton are  calculated. The potential of the interaction is considered as a Coulombic;  also,  the first and second order Born approximations have been used. The singularity of the Green operator in the second order approximation has been removed for the analytical solution of the scattering amplitude and the triple cross section calculation. Finally, the results for triple and double cross sections have been compared with the available theoretical and experimental results. The first and the second Born approximations are usually applied at intermediate and high impact energy ranges. However, it is  shown that it could be successfully applied at lower energies as well.

In the present work, the total cross-section for the ionization of  H, He, Ne and Ar atoms by +He2+ ، H+ ، Li3 ions has been calculated. In these calculations, a binary encounter approximation in the form of a two-body process between projectile ions and atomic electrons at the high energy range has been implemented. In order to enter the nuclear role of the target atom, the atomic electron velocity distribution function for H, He, Ne and Ar atoms was calculated and the average cross-section was obtained. In these calculations, the Hartree Fock wave functions were used to describe the ground state of  He, Ne and Ne atoms. Also, in the calculations related to atomic helium, a single-parameter wave function was used. Finally, the findings were compared with the available experimental and theoretical results.

  Body image disorder can decrease the quality of life. The aim of this study was to compare the body image flexibility, psychopathological symptoms, psychological damage, and emotion regulation difficulties in athlete and non-athlete females. For this purpose, 100 people in two groups of 50 athletes and normal females were selected through available sampling. These participants were studied based on body image flexibility, psychological damage, and emotion regulation difficulties. To evaluate the results of this study, collected data were analyzed using one way analysis of variance. Our findings showed that in dimensions of depression, anxiety, and stress, there are significant differences between two groups. The normal females experienced the mentioned dimensions more than athlete ones. Also, female athletes had higher scores in the body image flexibility that make them more vulnerable, although this difference was not significant. It was mentioned that in some components of emotion regulation difficulties, significant differences were found between the two groups. Therefore, it seems that female athletes are less vulnerable to psychological damages, although they may have not a positive body image of their physical appearance.

The aim of this study was to investigate the prebiotic potential of Roman nettle seed mucilage in the growth and survival of Lactobacillus rhamnosus (LGG) as well as changes in different physicochemical, reological and sensory properties of fermented milk compared with inulin (commercial prebiotic) during the storage time. For this purpose, values of 0.025, 0.05, 0.1 and 0.2% (w/w) of nettle seed mucilage and 0.5 and 1% (w/w) inulin has been added to the recombined milk and after inoculation of bacteria, changes in acidity, syneresis, viscosity, the number of probiotic bacteria and sensory properties were studied during 21 days. The results showed that the addition of mucilage to fermented milk improved the growth and survival of L. rhamnosus and subsequently increase the acidity of the samples. Furthermore, the addition of mucilage compared with inulin, led to reduction in syneresis of the samples and higher counts of probiotics during storage. Finally, according to physico-chemical, microbiological and organoleptic results, samples containing 0.1% (w/w) of mucilage were considered as the best sample in this study.

In recent years, the expansion of soft war dimensions has exacerbated the destructive cultural and social effects on the behavior of people and the soft war aims to change the religious, cultural, indigenous and national identity of the people. This study has investigated the relationship between national, social and cultural identity and impressionability of soft war based on personality traits and religious orientation. The present research is descriptive-correlational study. The Scale of evaluating the soft war psychological vulnerability, national identity, social identity and cultural identity Questionnaire, Five-factor model of personality and religious orientation were distributed among the participants to respond. Results indicated that there is a relationship between identity dimensions and impressionability of soft war, so that there was a negative correlation between cultural, social and national identity with dimensions of the soft war. Also assessment of the relationship between personality traits with impressionability of soft war showed a negative correlation between five-factor model of personality and dimensions of soft war, however, only the correlation between conscientious and cultural dimension of soft war was significant (p<0.05). It seems that identity and religious orientation variables compared with the dimensions of personality play a greater role in identifying and predicting the impressionability of the soft war.

The aim of this study was to investigate the influence of different parameters on exopolysaccharide (EPS) production from Enterobacter cloacae subsp. dissolvens using seawater as a basal medium. For this purpose, the effect of carbon (sucrose, molasses, paraffin and sunflower oil) and nitrogen sources, NaCl concentration, incubation time, pH as well as seawater dilution or enrichment with distilled water or Aloe vera, respectively on EPS production was investigated. Incubation of bacteria at 30°C in the seawater for 24 hours resulted in 0.56% EPS production. Increasing the incubation time from 1 to 4 days led to a decrease in biopolymer production. EPS yield was not affected by the addition of sucrose, pH (6-8) or by bacteria inoculation in brine (1-4% NaCl). Dilution of seawater with different ratios of distilled water (1:2, 1:1 and 2:1) or seawater enrichment with various concentrations of Aloe vera leads to EPS yield reduction. Polymer production was drastically increased with sunflower (to 5%) or paraffin (to 3%) concentration. The interactions between different parameters on EPS production in the formulated mediums with distilled water were studied. The results showed that EPS production was reduced significantly in the formulated mediums containing different concentrations of water, NaCl, nutrient broth, glucose, ammonium sulfate and potassium phosphate. Among different formulations, the highest yield (0.27%) was achieved with the formulation of distilled water, 3.4% NaCl, 1% paraffin and 0.05% KH2PO4, indicating that simulation of seawater using formulated distilled water didn’t provide comparable results. Therefore, paraffin and sunflower oil would be the matter of choice due to their higher productivity.

This study was performed for a period of 3 weeks, on the survival of Polychaeta Perinereis nuntia, at various salinities, temperatures and dissolved oxygen levels, in laboratory condition. Among these factors, salinity had the most significant effecton the survival of P. nuntia. There were one control group and 3 treatments at different salinities, includeing 1/5 (7.1 ppt), 3/5 (21.3 ppt) and 7/5 (49.7 ppt) of sea water salinity. The salinity of the control group was 35.5 ppt. Maximum rate of survival was observed in control group with 70% mortality and the minimum was in 7.1 ppt treatment by full fatality in the first week. There was significant difference in survival rate of various temperature treatments (p<0.05). Minimum and maximum survival rate in temperature treatments were in 44º Ϲ with 33% and 24 º Ϲ with 70%, respectively. Dissolved oxygen concentration was the least effective factor on survival of P. nuntia. The highest survival rate was in 5-6 ppm of dissolved oxygen concentration with 80% survival and the lowest was in 7-8 ppm with 73% survival. Results showed that the maximum survival rate of Perinereis nuntia was in dissolved oxygen treatments and the highest mortality rates were in different concentrations of salinity.

In the present work the first and second order scattering amplitudes and the related phase were calculated in the charge transfer channel. The positronium formation, with the impact of molecular hydrogen ion, has been carried out using multiple channel scattering formulation and transition matrix. The calculation of differential cross section has been done by varying the scattering angle from 0 to 180 in the fixed orientation of the molecule. In the next calculation the scattering angles were fixed while the spatial molecular orientation was varied. At last the calculated differential cross section was compared with available results in the literature. The scattering angle spanned from 0 to 180 degrees in the second order nuclear and electronic terms were calculated while the molecular orientation was assumed to be fixed. Otherwise, the scattering angles were fixed in the calculation of the corresponding amplitudes while the orientation was varied. At last our calculations were compared with available results

In order to investigate genetic correlation and path analysis between grain yield and yield components, fifteen early maturing hybrids of grain corn (Zea. mays) using a randomized complete block design with 4 replications were evaluated in Khoramabad agricultural research center, Iran. The data were collected and analyzed for ear emergence date, anthesis date, maturity date, plant height, ear height, plant stand, ear cover, grain number per row, row number per ear, grain depth, 1000- grain weight, plant value, cob percent, grain yield, stay green, stem and leaf resistante to disease. The results showed grain yield was positively correlated with plant height, ear height, grain depth, row number per ear, grain number per row, but negatively with 1000-grain weight, ear cover, cob percent and stay green. Between emergence date and maturity date and It was observed significant negative correlation stay green and leaf disease and positive significant correlation with ear height, grain depth and ear cover, suggested that late maturing hybrids with higher productivity were more resistante to diseases. The results of regression and path analysis showed that 1000-grain weigh and cob percent were correlated with yield negatively, and grain depth, plant height and plant stand were positively (R2=0.52) and had higher effects on grain yield.