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This study evaluates changes in species composition, catch, and CPUE of three species of kilkas in the Caspian Sea from 1961 to 2009. The effects of fluctuations in sea level rise and fall on the catch of kilka as well as the impacts of a recent invasion by Mnemiopsis leidyi (Ctenophora) were assessed in terms of species composition and CPUE of kilkas in the Iranian coastal region of the Caspian Sea. We found a negative correlation between long-term sea level changes and total catch (R2 = –0.56; P<0.001, which significantly declined in 1995 when the sea level increased to its highest level. Comparing catch per unit effort (CPUE) values during the pre-invasion (1996–1999) and post-invasion (2000–2009) periods indicated significant declines in anchovy and bigeye kilka, while common kilka increased significantly after the ctenophore invasion. During 2000–2009 overfishing, together with various environmental impacts following the introduction of Mnemiopsis, were major factors that contributed to changes in species composition and the collapse of kilka stocks in the Caspian Sea.

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Recently the previous Caspian ecosystem is in a catastrophic condition which caused changes in the absolute and relative abundance of the commercially important Caspian kutum (Rutilus frisii kutum) in Iranian waters. The paper presents estimates of yield-per-recruit and spawning biomass-per-recruit under various harvest strategies of F_max, F_0.1, F_30%. It proposes a method for estimating acceptable biological catch (ABC) that accounts for large differences in the quality and quantity of information and available data. The current average Y/R (with F=0.61/y, and t_c=3.2 y) was 218.3 g per recruit, which indicates that the fishery is operating below the maximum Y/R at 236.9 g when t_c = 3.5 y. The Y/R was the highest at F_max and F_0.1, when t_c = 4 y (244.8 g and 214.2 g), respectively. The F_30% value was 0.85/y at t_c of 4 y with the SB/R of 338.3 g. The F_current (0.61/y at current t_c is 3.2 y) is higher than the corresponding reference points, F_0.1 (0.47/y) and F_30% (0.46/y). The ABC of kutum was estimated at 7,850 mt in 2009-2010.

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The runoff generation and soil erosion in the Kechik Watershed, Golestan Province, was assessed, using a designed and constructed portable rainfall simulator. Treatments were applied on different land-uses, slopes and aspects as the most influential factors. Results showed that land-use significantly affected runoff generation (13.35 l, 6.9 l, and 4.12 l, respectively for agriculture, forest and rangeland uses), however slope (7.7 l for Class I; 9.23 l for Class II) and aspect (8.52 l for the northern aspects; 8.32 l for the southern aspects) did not have significant influence. All factors, significantly altered sediment concentration (Agriculture 9.6 g l^-1, forest 8.24 g l^-1, and rangeland 5.26 g l^-1; slope class I 6.6 g l^-1 and slope class II 8.7 g l^-1; northern aspect 8.7 g l^-1, and southern aspect 6.9 g l^-1). Agricultural fields generated the highest runoff and sediment under simulated rainfalls. Rangeland and forest did not have significant runoff generation and sediment concentration. Results showed that land-use management, especially in terms of agriculture, could not only hamper current erosion, but reduced further advancement of this encroaching phenomenon.

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 The changes of biodiversity, indicator species (IS) and catch per unit effort (CPUE) of bony fishes in beach seines in Iranian waters of the Caspian Sea during 1996 to 2012 was investigated. Among the catch of 14 species/groups, kutum and mullet comprised 56.78% and 31.81% of the total catch. Minimum and maximum CPUE were 158.5±9.1 and 344.9±31.2 kg/haul and Shannon diversity was 0.57±0.02 and 0.92±0.02, respectively. There were significant differences in community composition of fishes in beach seines among three seining times (morning, afternoon and night time), three seining periods (1996-2000, 2000-2005 and 2005-2012), three regions (west, middle and east), and different seasons (in all cases MRPP, p<0.001). During 1996-2000, Rutilus rutilus, Vimba vimba, Chalcalburnus chalcoides, Aspius aspius, Barbus sp., Salmo trutta caspius and, Silurus glanis in the years 2000-2005 species/groups shads, Abramis brama and Esox lucius and in the years 2005-2012 species Cyprinus carpio and Stizostedion lucioperca were indicator species. Also, in the west region of the Caspian Sea species/groups V. vimba, C. chalcoides, A. aspius, Barbus sp., A. brama,S.lucioperca,E.lucius and S. glanis; in middle Rutilus frisii kutum, shads and S. trutta caspius and in east species/groups mullets, R. rutilus and C. carpio were identified as indicator species.

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In recent decades, due to fluctuations in sea levels, environmental pollutions, and invader species invasion, the ecosystem of the Caspian Sea has been changed. In this study, assessing impact on ecosystem functiuons was conducted according to the new invader species (Mnemiopsis leidyi) by using commercial catches during three periods: 1996-2000, 2001-2006 and 2007-2011; in three phases of the invasion: establishment, expansion and adjustment, respectively. The results showed that in the three periods the average of catch of bonyfish were 15700.0±1993.2, 18430.8±3857.6 and 19176.6±1579.6 mt which was no significantly different among them (p>0.05) but the catch of kilkas (75080.0±16171.7, 25129.5±10441.5 and 21105.2±5199.2 mt, repectively) and sturgeons (1010.2±242.8, 385.5±264.3 and 51.8±19.9 mt, respectively) declined sharply and were significantly different among them (p<0.05). During three periods, ecosystem functions had a wide ranged change. The ecosystem functions were shifted E0 (No impact) in first period to E2 (moderate impact) and E3 (strong impact) in the second and third periods. Loss functions of two keystone species (anchovy and bigeye kilka) can be one of the resesons of sharp decline in upper layer of food web chain, i.e. sturgeons and Caspian seal in the Caspian Sea.  

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1. Introduction

 
The usefulness of error correction in improving students’ grammatical accuracy has been the focus of attention in the past decades, and hot debates have raged on over this issue. There is yet no clear answer, to date, as to the efficacy of feedback and its various types. The aim of this study is, thus, to shed more light on the relative effectiveness of feedback per se and also the efficiency of some types of grammatical feedback, delivered electronically through MS Word software, over the others in improving students’ written accuracy.
 
 

2. Research questions

 

1. Is there any effect, whatsoever, for different types of feedback (i.e. direct, indication only & indication plus location) when delivered electronically in improving students’ level of grammatical accuracy?
2. Is there any priority for each of the above feedback types over the others?

 
 

3. Method

 
Participants
 
The participants of this study included 85 Iranian English majors. Of the total participants, 53 were female and 32 were male. The number of females and males were 15 and 11, 13 and 6, 12 and 8 and, 13 and 7 for control group, direct feedback group, indication group and indication and location group respectively.
Design and procedure
This study employed a pretest-treatment-posttest format. Of the four groups involved in the study, three were treatment groups and one was the control group. In the first treatment group, direct feedback group, the correct form of the students’ grammatical errors was provided. The two other treatment groups were, however, both provided with indirect feedback. In one of them, the indication-only group, the students were provided with an indication in the margin of the line in which the error was committed to show that an error or errors have occurred. The indication and location group was provided with feedback as to the exact word or phrase in the text that included a grammatical error.
Analysis
To answer the first research question (i.e. its three sub-questions), three paired sample T-test were used. The second research question (i.e. its three sub-questions) was answered using one-way ANOVA.

4. Results

Significant difference was found between the pretest and the posttest of the direct feedback group in the mean rate of errors (t=3.475; p‹.05). It means that the provision of direct written corrective feedback has been effective in improving students’ level of accuracy to a statistically significant level. However, the second group of the study, the indication only group, did not show any significant improvement in accuracy from the pretest to the posttest (t=1.627; p›.05). No significant improvement in grammatical accuracy was also observed for the indication and location group.
The primary result of the analysis indicated that there was a significant difference between the four groups with respect to their improvement from the pretest to the posttest (F=6.771; p‹.001). To further investigate the details of this comparison Tukey’s post hoc measure was used. Tukey’s index indicated that there were significant differences between direct feedback group on the one hand and control group (p‹.001), indication only group (p‹.05) and indication and location group (p‹.05). It was, in fact, the direct corrective feedback group whose improvement in accuracy was statistically significantly higher than the other groups. No other significant difference was found between other pairs of the groups with respect to accuracy improvement.
 

5. Conclusion

An explanation for the findings of the first question can be offered with regard to Schmidt (1990) noticing hypothesis. Among the three types of feedback offered to the groups of the study, direct feedback is apparently the most noticeable. This characteristic may lend this type of feedback to longer retention and quicker internalization. Comparison of the means of improvement for the three treatment groups clearly indicates that the direct group made the most substantial improvement of all. The second substantial improvement is made by indication and location group and the lowest improvement was made by the indication only group. This ranking of improvement is in other words a ranking of noticeability of feedback, and although not consistent with many parts of the literature, is totally consistent with some others especially Schmidt’s noticing hypothesis.
 
The findings of the second research question can also be interpreted and justified in light of the noticing hypothesis. This point that the direct feedback turned out to make a significant difference and is significantly different from other types of feedback can be justified in light of the fact that the participants of this study were roughly (and not definitely) of the intermediate level of proficiency. For these students, getting involved in problem solving (as the indirect types of feedback requires) while at the same time involved in the quite demanding task of following the ideas might be rather over-demanding, hence distracting their attention. Also, there are many grammatical points which are yet totally unknown to intermediate students and therefore any involvement in problem solving will lead nowhere, no matter how much effort the student makes. This point is also well recognized by Ferris and Roberts (2001) who suggest that direct feedback is perhaps more efficient than indirect corrective feedback with writers of low levels of proficiency.
 

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Aims: Evaluating diabetics’ health-promoting behaviors is an essential part of nursing care. This study aimed to examine the relationship between health-promoting behaviors and perceived social support from the family in patients with type 2 diabetes.
Instrument & Methods: This was a descriptive cross-sectional study. The data were collected from a foundation university hospital in Tabriz, Iran. The sample consisted of 183 type 2 diabetes patients. Data were collected using the Perceived Social Support from Family and Health-Promoting Behaviors scales.
Findings: The average score of social support was 15.07±6.74 (range: 0 to 20), and the average score of health-promoting behaviors was 49.62±17.74 (range: 0 to 112). There was a significant and positive correlation between the scores of health-promoting behaviors and perceived social support (r=0.28, p<0.001). We predicted the changes in health-promoting behaviors based on the regression analysis of the changes in perceived social support from the family (B=0.563).
Conclusions: Family social support affects health-promoting behaviors in type 2 diabetes patients, and should be considered during interventions to improve health-promoting behaviors by nurses and other healthcare providers. We suggest other descriptive correlational studies with a higher sample size and interventional studies on this subject.
 

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Aims: Hospital-acquired infections represent a significant global health challenge, leading to increased patient morbidity, mortality, and healthcare costs. This study aimed at evaluating the knowledge and practices of healthcare workers at Ghaem Hospital’s special care units concerning the control of hospital-acquired infections.
Instrument & Methods: This descriptive-analytical research employed a comprehensive approach, encompassing all nursing and patient-care staff in the special care units of Ghaem Hospital in Mashhad. Conducted from 2022 to 2023, the study utilized a census and sampling method to gather data, which were collected via two questionnaires-one capturing demographic details and the other assessing knowledge and practices related to infection control.
Findings: A total of 96 individuals participated in the study, predominantly nurses (62.5%), followed by paramedics (24%), and doctors (13.5%). Practices of hand hygiene before procedures varied in different groups. 30% of doctors, 34% of nurses, and 30% of paramedics thoroughly washed all parts of their hands; 63% of doctors, 57% of nurses, and 50% of paramedics used soap; complete fingernail washing was done by 43% of doctors, 45% of nurses, and 56% of paramedics, showing a statistically significant difference (p<0.05). Post-procedure hygiene responses were positive from 44% of doctors, 33% of nurses, and 50% of paramedics. Knowledge regarding the transmission of urinary and ventilator-associated respiratory infections was generally high among doctors and nurses but lower among paramedics.
Conclusion: Healthcare staff adheres to infection control guidelines to varying degrees, with doctors and nurses generally performing better than paramedics.
 

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One of the most favorable results of roasting process is increasing in antioxidant activity which is mainly due to the formation of mailard reaction products. Roasting of domestic pistachio nut (Ahmad Aghayi cultivar) and wild pistachio nut (P.mutica) was performed by two methods of oven and microwave. After oil extraction, the extract meals of pistachios were prepared and their phenolic content and antioxidant activities were determined. Phenolic content of pistachio meal extract was in the range of 915-797 mg Gallic acid in kg oil. By comparing phenolic compounds before and after roasting, it can be realized that roasting can increase the amount of phenolic compounds and antioxidant activity of pistachio meals. Pistachio meal extracts were added to soybean oil without antioxidant. The soybean oil samples containing pistachio extracts as a natural antioxidant, BHT as synthetic antioxidant and an oil without antioxidant as control maintained in oven at the temperature  of 60 in 30 days to evaluate the antioxidant stability and sampling was performed in 1, 15 and 30 days. The results of peroxide and thiobarbituric acid during the storage period showed that the extract of pistachio meal can be used as a good source of natural antioxidant to prevent oxidation in oils.  

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There is a global interest to study lactic acid bacteria (LAB) of artisanal fermented products like yoghurt for improving or replacing current strains used in commercial starter cultures. In this work, five traditional yoghurt samples were collected from different areas of Khorasan-e-Razavi. Grouping and identification of isolates were carried out on the basis of physiological and biochemical tests (non-molecular),as well as ARDRA technique and sequencing (molecular methods). Totally, 71 isolates including 33 Streptococcus thermophilus, 30 Lactobacillus delbrueckii (subsp. Bulgaricus and lactis), were identified as dominant strains in all yoghurt samples. Also 8 other isolates belonging to Lactobacillus helveticus, Pediococcus pentosaceus and Weissella cibaria were observed. Results of this research show the diversity of LAB population in collected samples.

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Electrohydraulic forming (EHF) is a high velocity forming process in which the electric energy stored in the capacitors are suddenly discharged between two electrodes submerged in a water-filled chamber. During the discharge, the water between the electrodes vaporizes and creates a shock wave that is transferred to the blank using the water and forms it. One of the key parameters in electrohydraulic forming is the determination of the suitable position of the electrodes. In this research the effect of electrodes position in electrohydraulic free-forming is investigated using the finite element simulation. First the experiments available in the literature is simulated using the software ABAQUS/ Explicit and compared with the experimental results which shows good agreement with. Then by changing the position of the electrodes, the effect of their position on the formability and thickness distribution of the blank is investigated. The results indicates that the forming a component is only possible in limited positions of the electrodes and there is a position for the electrodes that not only improves the sheet thickness but also decreases the possibility of the failure.

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The incremental forming process which can be used in low quantity production of the components is a relatively new forming process for sheet metal components. One of the problems of this method is thinning and non-uniform thickness distribution of the component in radial direction. In the incremental forming process, the sheet thickness in the wall of the formed cup is reduced considerably while the thickness in the bottom of the formed cup is unchanged. This problem is hindering the wide application of the incremental forming process in the industry. In this paper, a new method is presented for the improvement of the thickness distribution in the incremental forming process. In the presented method, a new preform is added to forming stages which reducing the sheet thickness in the bottom of the formed cup, increases the minimum thickness in the wall of the formed cup and improves its thickness distribution. The incremental forming process are simulated using the software ABAQUS and verified using the experiments available in the literature. Then the proposed method is simulated which its result indicates the capability of the presented method in thickness improvement.

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In this paper, the single point incremental forming (SPIF) of friction stir welded (FSWed) 5083 aluminum alloy sheets are investigated experimentally and numerically. The aluminum sheets with 2mm thickness are friction stir welded with the same FSW parameters. In order to obtain the effect of FSW on the formability of SPIF, the base sheets and FSWed sheets are formed to conical shapes with different forming angles and then the limiting wall angles are determined for each condition. The experimental results indicate that the limiting forming angle of FSWed sheet is not so much different than the base sheet and FSW does not have a negative effect on the sheet metal formability in SPIF. To study the effect of SPIF and FSW in mechanical and microstructural properties of the formed parts, the effects of these process on the grain size and micro-hardness is investigated. Furthermore, the incremental forming is numerically simulated using the ABAQUS software and the sheet thickness distribution, obtained from the simulation, is compared with the experimental results. After verification of the numerical simulation model, the effect of FSW on the thickness distribution and strain distribution in SPIF is studied. The results indicate that in weld region and base metal region, the distributions of thickness and major strain are uniform while the distribution of minor strain is non-uniform.

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In this paper, the performance of three turbulence models, zonal k-ε, linear low-Reynolds k-ε and nonlinear low-Reynolds k-ε in the prediction of flow and heat transfer through a dimpled channel is investigated. Furthermore, the effect of YAP term replacement with NYP length scale correction term is studied. Dimples are heat transfer devices which are employed in gas turbine blades to increase the heat transfer levels. These devices do not act as an obstacle for flow, and thus they produce low pressure losses. In this study, the governing equations on flow and energy are solved using the finite volume method together with the SIMPLE algorithm. The results obtained with YAP term indicate that the nonlinear model predicts larger recirculation flow inside the dimple than zonal and linear models. Also, the intensity of impingement and upwash flow in this model is greater than other models. Heat transfer results show that the zonal model predicts the heat transfer levels lower than experimental measurement. Using the linear model leads to a better prediction of heat transfer inside the dimples and their back rim. Compared to these models, the nonlinear model yields a better prediction not only for the smooth area between the dimples, but in the back rim of the dimple. The replacement of the YAP term with the NYP term in linear and nonlinear models leads to more accurate results for heat transfer in dimple span-wise direction and back rim.

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One of the usual methods for river banks protection is using spur dike structures that if properly designed and executed, in addition to controlling erosion, It leads to the rehabilitation of rivers margin valuable lands. Spur dikes affect the streamlines and it make changes in the velocity and direction of the flow, leading to major changes in the bed topography around the spur dike as well as the beaches. Recognizing and directing these changes will lead to the River Affordable Planning in the desired areas.  In the present study, the effect of the Deflecting open gabion spur dike, attracting and repelling on the bed topography of the flow path and flow pattern has been investigated. ADV was used to measure flow velocity in different directions. This velocity meter is submitted by transmitting waves of 10 or 16 MHz frequency from a transmitter to a sample size of 6 mm in diameter and 3 mm in diameter at a distance of 5 cm from the transmitter and receiving waves by receiver antennas measures the velocity of particles within the sampling volume. The device has the ability to measure the distance from the floor inside the water. Therefore, taking into account the baseline level, the measured distance at each point was deducted from the base value and the scouring of that point was obtained. In these experiments, the Froude number was fixed at 0.26. Also, the depth of flow in the set of experiments is 14.6 cm, which is extracted according to the discharge rate and the displacement threshold formula. The experiments were carried out in such a way that after the equilibrium of the bedding and scouring harvest, the flow pattern was started using the ADV device.
 In this review, the performance of the spur dikes will be compared with the impervious spur dike. The results show that by decreasing the porosity of the spur dikes, the mainstream deviation and the intensity of the secondary flows around the spur dike have increased, which increases the topographic changes of the bed and creates larger cavities around the spur dike. As the erosion rate increases around the spur dike, sedimentation on the edges increases.In all three types of spur dikes, with increasing porosity, the dimensions of the scour hole are reduced. By increasing the porosity of the spur dike, the flow velocity from the pores of the spur dike increases, which reduces the difference in the flow rate from the headland and the flow through the pores of the spur dike and reduces the ability to carry flow sedimentation. In a spur dike with 50% porosity, bed topography changes occurred in a very small area around the spur dike and focused on the nose, while for a spur dike with zero porosity, the topography of the bed, depending on the type of spur dike, is several times the length of the spur dike, in Channel length and width occurred. The attracting spur dike has created much less variation in the flow pattern due to the way it is placed in the path of flow, and therefore the bed topography is less influenced by the presence of the spur dike.
 

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Current management pattern of the rural development plan, has caused to the different challenges (environmental, socio, economic, and physical) in the case study region (villages of Tehran Province) because of the Up-down and sector approach dominance. Thus, this study seeks to answer this strategic question that “how much management of the rural development plan has considered to the principles, framework and process of spatial planning in various stages of preparation ,implementation and evaluation of development plans in the study area,? " To answer that strategic question, descriptive-analytical method has been used. The required data have been collected by documentary and field methods. The study population is 129 village with more than 20 households in Shemiranat, Tehran and Rey Towns, that 12 villages were selected.The number of 12 questionnaires at the level of village's administrators (The Council /Rural manager) and 120 questionnaires at the level of heads of households have been distributed and filled. The statistical t-test is used to analyze. results showed that, with the exception of a few cases (like Chaleh-Tarkhan village that was average), generally, there is no meaningful differences between case study villages in terms of the amount of attention to the framework, principles and process of spatial planning in the preparation, implementation and monitoring and evaluation stages of the rural development plan and actually, most of the villages have undesirable situation in discussed indicators.        

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Abstact:  Hydrodynamically, there is a complex confrontation among the porous obstacles along the flow path and the fluid is significantly important Existence of obstacles in the flow path causes changes in hydraulics and hydrodynamic parameters of the flow. Among the hydrodynamic parameters that change due to the presence of obstacles in the flow path, we can mention the intensity of flow turbulence. Since turbulence is related to the energy dissipation of flow, it has always been important to study this phenomenon.one of the most important issues of river engineering is The construction of obstacles in the fluid path, especially when these obstacles are built at the river crossing. The results of studying the behavior of fluid around porous obstacles can be used in the design of gabion groins, as well as the construction of gabion obstacles in the flow path, to dissipate flow energy .In this study, the flow structure around porous groins on the side of the canal and porous obstacles in the middle of a straight channel with a fixed bed has been investigated in a laboratory. The ADV  was used to measure three-dimensional velocities and reynolds stresses around the gabion obstacles with different porosity on the side and middle of the channel The obstacles on the side of the canal act as groins and the obstacles in the middle of the canal act as obstacle consuming the energy of the stream. The velocity was measured at 1265 points for groins and it was measured at 1525  points for obstacles located in the middle of the channel .The results showed that the three-dimensional velocity components  decrease with increasing porosity in groins and obstacles. Also, the separation of flow, return flow, ..., is more severe when the obstacles is in the middle of the channel than when the groin is on the side of the channel wall.Also, the effect of porosity percentage on obstacles is much greater and clearer than on groins.And the intensity of turbulence and the extent of the area have the maximum intensity of turbulence in the obstacles in the middle of the canal is more severe than the groins in the side wall. The maximum amount of kinetic energy for obstacles is somewhat larger than for similar groins. However, the maximum turbulence intensity for the obstacles with porosity percentages of 0, 20, 40 and 60 is about 2.95, 2.4, 1.9 and 1.6 times the maximum turbulence intensity in the same groin, which is relatively large. Therefore, it can be understood that the presence of a obstacles in the middle of the channel, although it does not cause much change in flow energy, but the presence of obstacles in the middle causes the current energy dissipation up to about 2 times the current energy dissipation behind the groin.and, the process of reducing the intensity of turbulence is slower at higher porosities. Finally, The width of the zone with more turbulence intensity in the cross section for the obstacles with porosity of 0, 20, 40 and 60% is about 2.3, 2.1, 2 and 1.9 times the range in the same groin, respectively. Which in itself indicates a greater depreciation of the flow behind the obstacle.