-
Open Access Article
1 - Investigation of Magnitude and Position of Maximum von Mises Stress in The Cylindrical Contact Problems
Hasan Heirani Reza Naseri -
Open Access Article
2 - Investigation of Compressive Stresses of Stainless Steel 316L Diamond Lattice Structures Under the Effect of Spherical Connections Produced by SLM Additive Manufacturing
Behnam Ahmadi Roozbahani AliAkbar Lotfi NeyestanakIn this study, the compressive stresses of dodecahedron diamond lattice structures have been investigated. The finite element method has been used for Stress analysis. After the simulation, it was found that more stresses are applied at the junction of the struts of thi MoreIn this study, the compressive stresses of dodecahedron diamond lattice structures have been investigated. The finite element method has been used for Stress analysis. After the simulation, it was found that more stresses are applied at the junction of the struts of this structure due to the application of compressive force. For this purpose, the connection point of the structure’s struts was strengthened by spherical connections, and a new type of dodecahedron structure was created. The validation and effect of spherical connections in compressive stresses have been evaluated experimentally. Two types of diamond lattice structures are made of stainless steel 316L by the SLM method. The results show that in the same condition, the use of spherical connections with twice the diameter of the structure’s struts helps to strengthen the structure and increase its compressive strength by 18% compared to the simple structure. Manuscript profile -
Open Access Article
3 - Weld Distortion and Residual Stresses in Aluminum Hollow Section T-Joint
Asghar Mahdian Arash Babamiri Behrooz Shahriari -
Open Access Article
4 - Analysis of Thermal-Bending Stresses in a Simply Supported Annular Sector Plate
T Dhakate V Varghese L Khalsa -
Open Access Article
5 - Multi-Objective Optimization of Shot-Peening Parameters Using Modified Taguchi Technique
M Hassanzadeh S. E Moussavi Torshizi -
Open Access Article
6 - Thermoelastic Behaviour in a Multilayer Composite Hollow Sphere with Heat Source
S.P Pawar J.J Bikram G.D Kedar -
Open Access Article
7 - Thermoelastic Analysis of Annular Sector Plate Under Restricted Boundaries Amidst Elastic Reaction
A Mahakalkar V Varghese -
Open Access Article
8 - Effect of Thermosensitivity on Heat Conduction and Stresses of a Multilayered Annular Disk
G.D. Kedar V.B. Srinivas V.R Manthena -
Open Access Article
9 - Magneto-Thermo-Elastic Behavior of Cylinder Reinforced with FG SWCNTs Under Transient Thermal Field
A Ghorbanpour Arani M.R Mozdianfard V Sadooghi M Mohammadimehr R Kolahchi -
Open Access Article
10 - Two New Non-AFR Criteria for Depicting Strength Differential Effect (SDE) in Anisotropic Sheet Metals
F Moayyedian M Kadkhodayan -
Open Access Article
11 - Mathematical Modeling of Thermoelastic State of a Thick Hollow Cylinder with Nonhomogeneous Material Properties
V. R Manthena N.K Lamba G.D Kedar -
Open Access Article
12 - Thermoelastic Analysis of a Rectangular Plate with Nonhomogeneous Material Properties and Internal Heat Source
V. R Manthena N.K Lamba G.D Kedar -
Open Access Article
13 - Steady Thermal Stresses in a Thin Rotating Disc of Finitesimal Deformation with Mechanical Load
J Kaur P Thakur S.B Singh -
Open Access Article
14 - Semi-analytical Solution for Time-dependent Creep Analysis of Rotating Cylinders Made of Anisotropic Exponentially Graded Material (EGM)
A Loghman V Atabakhshian -
Open Access Article
15 - Stress Analysis in Thermosensitive Elliptical Plate with Simply Supported Edge and Impulsive Thermal Load
V Varghese P Bhad L Khalsa -
Open Access Article
16 - Plane Strain Deformation of a Poroelastic Half-Space Lying Over Another Poroelastic Half-Space
A Miglani N Kumari -
Open Access Article
17 - Estimation of Thermoelastic State of a Thermally Sensitive Functionally Graded Thick Hollow Cylinder: A Mathematical Model
V. K Manthena N.K Lamba G.D Kedar -
Open Access Article
18 - A review of some studies on the effects of various irrigation methods on some oilseeds
Mostafa Mobasher Najme YazdanpanahAbout 70% of the world's population's food comes directly from crops, of which the important role of oilseeds can not be denied. Oil consumption in Iran has increased in recent years due to population growth and per capita consumption, so that considering the per capita MoreAbout 70% of the world's population's food comes directly from crops, of which the important role of oilseeds can not be denied. Oil consumption in Iran has increased in recent years due to population growth and per capita consumption, so that considering the per capita consumption of 14 kg, about 750,000 tons of oil is needed annually. However, less than 10% of this oil is produced domestically. Due to this issue, oil production through rapeseed cultivation has been considered in recent years. Drought is a threat to the successful production of crops worldwide. Drought occurs when a combination of physical and environmental factors causes internal stress in a plant and reduces production. Water stress has a negative effect on many plant processes, including photosynthesis, evaporation, accumulation and allocation of precursors, and causes a significant reduction in crop production. Therefore, one of the ways to maximize water use efficiency and increase yield per unit of water consumption is low irrigation, in which the crop is subjected to water stress at a certain stage of development or throughout the development season. On the other hand, the positive effects of potassium in increasing the resistance of plants to dehydration stress have been reported by researchers. Manuscript profile -
Open Access Article
19 - Effects of Paclobutrazol Application on Plants as a Chilling Stress Ameliorator
Mahroo Mojtabaie Zamani -
Open Access Article
20 - Effect of oil gallery on the piston thermo-mechanical stresses
Hojjat Ashouri Afshin AfshariThe piston is the heart of an engine, which is subjected to thermal and mechanical loading, and due to the fact that it withstands extreme fluctuations in temperature and gas pressure, it is considered a very critical part. The aim of this study is to evaluate the effec MoreThe piston is the heart of an engine, which is subjected to thermal and mechanical loading, and due to the fact that it withstands extreme fluctuations in temperature and gas pressure, it is considered a very critical part. The aim of this study is to evaluate the effect of oil gallery on the thermo-mechanical stresses for XU7JP/L3 engine piston. For this purpose, first Solidworks software was used to model the XU7JP/L3 engine piston. An oil gallery was also created on the piston head. Then ANSYS software was used to analysis the thermo-mechanical stress of the piston. Finally, the effect of the oil gallery on the thermomechanical stress distribution of the piston was studied. Boundary conditions in thermal and mechanical analysis were extracted from one-dimensional simulation in GT-POWER and MATLAB software. The results of the thermal analysis showed that the oil gallery reduces the temperature of the engine piston by about 12°C. The results of the mechanical analysis showed that the Von-Mises stress in the modified piston is reduced by about 13 MPa. To evaluate properly of thermo-mechanical results, the simulated results is compared with real sample of damaged piston and it has been shown that critical identified areas, match well with areas of failure in the real sample. Manuscript profile -
Open Access Article
21 - Analysis and presenting an optimum post weld heat treatment cycle to maximum reduction of residual stresses of electron beam welding
Hossein Rajabi Ali HeidariIn this research, the electron beam welding process of P91 steel plates was simulated by the finite element method in two dimensions and in a short time with acceptable accuracy in two steps (non-coupled thermal and mechanical analysis). The simulation results were vali MoreIn this research, the electron beam welding process of P91 steel plates was simulated by the finite element method in two dimensions and in a short time with acceptable accuracy in two steps (non-coupled thermal and mechanical analysis). The simulation results were validated with experimental and numerical results presented by other researchers. Moreover, by applying post weld heat treatment, the residual stresses were reduced. Then, the effect of heat treatment cycle parameters such as heat input power, heating time, holding time and cooling rate were investigated on the quantity of residual stress reduction. By examining the results of the effects of the parameters, an optimum heat treatment cycle is introduced to maximum reduction of the residual stress. Using this optimum heat treatment cycle, the residual stress value was reduced to 55 percent. Manuscript profile -
Open Access Article
22 - The effect of muscular stresses on the quality of broiler meat
یوسف Doustar فرید Sarkarati افشین Javadi وحید Haji AbaloCollection and transport of chickens from the production farm to the slaughterhouse causes stress. In this study, the relationship between stress causing factors and broiler meat quality was evaluated. Thirty apparently healthy 60-day-old broilers of the same sex and br MoreCollection and transport of chickens from the production farm to the slaughterhouse causes stress. In this study, the relationship between stress causing factors and broiler meat quality was evaluated. Thirty apparently healthy 60-day-old broilers of the same sex and breed were allocated equally to three groups (A and B as treatment and C as the control group). The nutritional and rearing conditions were similar for all groups. Broilers in the first treatment group (A) were subjected to various muscular injuries similar to those occurring during gathering and transfer to abattoir while those in the second treatment group (B) were forced to flap their wings severely. Twelve hours after exertion, blood samples were collected for measurement of creatine phosphokinase (CPK) and total volatile nitrogen (TVN) levels and tissue samples were taken from deep pectoral muscle to prepare microscopic sections in all groups. Macroscopically, swelling, bruising and severe hemorrhage was evident in deep pectoral muscle of the treatment groups, while edema, degeneration, necrosis and infiltration of heterophiles, lymphocytes and macrophages were observed microscopically. Specific tissue changes were not seen in the control group. The levels of CPK and TVN had increased in treatment groups compared to the control group and their mean differences were also statistically significant (P<0.005). Manuscript profile -
Open Access Article
23 - Role of exogenous phytoprotectants in mitigation of adverse effects of abiotic stresses
Ali Namvar Hashem Hadi Raouf Seyed sharifiPlants are always subjected to various environmental adverse factors such as salinity, drought, high/low temperatures, heavy metal toxicity, waterlogging, UV-B radiation, and ozone. Abiotic stresses cause hampering in the growth, physiology, and yield of crops and thus, MorePlants are always subjected to various environmental adverse factors such as salinity, drought, high/low temperatures, heavy metal toxicity, waterlogging, UV-B radiation, and ozone. Abiotic stresses cause hampering in the growth, physiology, and yield of crops and thus, are an important challenge for crop production and food security. Various strategies have been proposed to improve crop production under stress conditions, but attempts to enhance yield under these conditions have been largely unsuccessful. However, in recent years, exogenous application of phytoprotectants such as osmoprotectants (like proline and Glycinebetaine), phytohormones (for instance Abscisic acid, Salicylic acid, Gibberellic acid, Jasmonic acid, Brassinosteroids, and polyamines), antioxidants (including Ascorbic acid, Glutathione, and Tocopherol), micro nutrients (like Iron and Zinc), and trace elements (including Selenium and Silicon) have been found effective in mitigating the stress-induced damage in plant. This strategy has gained considerable attention because of its high efficiency, feasibility, and cost and labor effectiveness. Moreover, exogenous phytoprotectants show acceptable capacity to enhance plants’ growth, yield, as well as stress tolerance under adverse environmental factors. Regarding the importance of the application of exogenous phytoprotectants under stress condition, this article provides a review of the major responses of plants to these components in the presence of growth restriction factors. Manuscript profile -
Open Access Article
24 - Phytochemical and physiological study of Satureja sahendica Bornm essential oil and extract to water-deficit stress
Hamid Mohammadi Parya Pourmohammad Saeid HazratiTo investigate the effect of water-deficit stress on physiological characteristics, content and composition of Satureja sahendica Bornm essential oil, an experiment was conducted in greenhouse conditions in a randomized complete block with three replications in 2019. Di MoreTo investigate the effect of water-deficit stress on physiological characteristics, content and composition of Satureja sahendica Bornm essential oil, an experiment was conducted in greenhouse conditions in a randomized complete block with three replications in 2019. Different levels of water-deficit stress included: control at 100% field capacity, 40% and 70% field capacity depletion. Essential oils were extracted by water distillation and then were analyzed using GC-MS. After preparing methanolic extract, total phenol content was measured by Folin-Ciocalteu method. The results showed that water-deficit stress in both levels (40 and 70% moisture depletion) caused a significant reduction of 74.73 and 78.83% of dry weight compared to the control, respectively, but no significant difference was observed between the two stress levels. Water-deficit stress with 40 % and 70% moisture depletion led to a reduction of 18.49% and 30.87% of total chlorophyll content, 13.84% and 25.35% of relative leaf water content (RWC) content, respectively. The content of hydrogen peroxide, malondialdehyde and proline increased significantly under water-deficit stress conditions. The total phenol content increased by 25.78% and 48.44% in 40% and 70% moisture depletion, respectively. The most important composition of S.sahendica essential oil in all treatments included p-cymene, γ-terpinene and thymol; water stress affected the amount of these compounds and a significant increase of 11.47% and 30.65% in thymol content was observed in 40 and 70% moisture depletion, respectively. Based on the results, it was found that water-deficit stress can increase the physiological properties, quantity and quality of S. Sahandi essential oils. Manuscript profile -
Open Access Article
25 - Experimental Study on In-Depth Residual Stress due to 420 Stainless Steel Creep-Feed Grinding Using the Deflection-Electro Polishing Technique
Vahid Jafarpour Rasoul Moharrami -
Open Access Article
26 - Evaluation of initial imperfection mode shapes and slashing of steel tanks
Ahmad maleki Ali satariThin wall shell structure has low weight and high resistance. The load capacity, buckling behavior and post buckling behavior of steel tanks thin wall, is very sensitive to geometric imperfections. Due to the small wall thickness of the shell structures enabling t MoreThin wall shell structure has low weight and high resistance. The load capacity, buckling behavior and post buckling behavior of steel tanks thin wall, is very sensitive to geometric imperfections. Due to the small wall thickness of the shell structures enabling the creation of any deformation and there is a disturbance on the surface of the wall. Considering the types of errors occurred when build or assembled these structures, are not built these structure, ideally. This imperfections may be in the process of rolling, removable panels, installation or welding arise. Incomplete reports about the negative impact of the effect of welding on the axial bearing capacity. Comprehensive research on the effects of imperfection of initial geometrical shape on the steel tank vibration modes, and its effect on the bearing capacity steel storage tanks that considerable research It's not done. In this research, the actual behavior of cylindrical shells with initial geometric imperfections on mode shapes steel tanks in the pre-buckling and post-buckling. And the effect of initial geometric imperfections on steel tanks slashing been paid. Using finite element software, ABAQUS, and verification of the results of the analysis and nonlinear analysis with experimental results. Been paid. Imperfect geometric shape has changed mods. The effect of these changes on slashing are very small. Manuscript profile -
Open Access Article
27 - تاثیر سالیسیلیک اسید بر صفات مورفولوژیک و فیزیولوژیک گیاه زینتی-دارویی پریوش (Catharanthus roseus) تحت دورهای مختلف آبیاری
داود هاشم آبادی زهرا اسدی بیگ زاده محله فیروزه پورزرنگاربهمنظور بررسی اثر دورهای مختلف آبیاری (I) و محلول پاشی سالیسیلیک اسید (M) بر خصوصیات مورفولوژیکی و فیزیولوژیکی پریوش آزمایشی فاکتوریل بر پایه طرح کاملا تصادفی با سه تکرار به اجرا درآمد. تیمارهای آزمایشی شامل دورهای آبیاری (2 (I1)، 4 (I2)، 6 (I3) و 8 (I4) روز یکبار) و د Moreبهمنظور بررسی اثر دورهای مختلف آبیاری (I) و محلول پاشی سالیسیلیک اسید (M) بر خصوصیات مورفولوژیکی و فیزیولوژیکی پریوش آزمایشی فاکتوریل بر پایه طرح کاملا تصادفی با سه تکرار به اجرا درآمد. تیمارهای آزمایشی شامل دورهای آبیاری (2 (I1)، 4 (I2)، 6 (I3) و 8 (I4) روز یکبار) و دفعات مختلف محلولپاشی با 200 میلیگرم در لیتر SA (0 (M0)، 1 (M1) و 2 (M2) بار) بودند. نتایج نشان داد که در صفات مورفولوژیک، بیشترین تعداد گل ( 66/25)، کمترین ریزش برگ (8/3) و بیشترین وزن تر ریشه (181/1 گرم) متعلق به I2M2 است. I1M0 در صفات ارتفاع بوته (154 سانتی متر) ، تعداد برگ (36 عدد)، طول میانگره (243/9 میلیمتر)، وزن تر اندام هوایی (636/8 گرم) و ماده خشک اندام هوایی (20/26 درصد) دارای بیشترین مقدار بود. بیشترین قطر گل (176/1 میلیمتر)، تعداد گره در بوته (66/16)، وزن تر بوته (366/9 گرم) و ماده خشک ریشه (03/30 درصد) متعلق به I1M2 بود. در صفات فیزیولوژیک، I1M0 بیشترین مقدار کلروفیل b، کلروفیل کل و آنتوسیانین گلبرگ را داشت. بیشترین و کمترین مقدار پرولین به ترتیب متعلق به I3M2 و I2M0 بود. کمترین مقدار MDA (42/1 نانومول در هر گرم وزن تر) به I4M1 و بیشترین فعالیت SOD (IU g-1 F.W. 88 ) به I3M0 اختصاص داشت. فعالیت POD در تیمار I2M0 کمترین و در تیمار I4M2 بیشترین مقدار بود. در کل با توجه به وقوع آثار مخرب تنش کمبود آب در دورهای آبیاری 6 و 8 روز یکبار، کاربرد SA در این شرایط جهت بهبود رشد پریوش توصیه میشود. Manuscript profile -
Open Access Article
28 - Study of pH Changes of Culture Medium of Green Microalgae (Scenedesmus quadricauda) under Chemical Stresses
A. piraliBiological, chemical and physical factors influence on physiology of aquatic microalgae. Changes in these factors effect and disturb the life cycle of microalgae as well as their physiological parameters.In this study the changes of pH in the culture medium of green alg MoreBiological, chemical and physical factors influence on physiology of aquatic microalgae. Changes in these factors effect and disturb the life cycle of microalgae as well as their physiological parameters.In this study the changes of pH in the culture medium of green algae Scenedesmus quadricauda (Turp.)Bréb. In three different culture media under chemical stresses using herbicideMetribuzin and water hardness, was investigated. The experiment was conducted in a completely randomized design for a period of 21 days. Change in acidityof culture media A and B had direct relationship with water hardness and presence of herbicide. Results of pH changes in medium A suggest a direct correlation with the amount of chlorophyll a, b and carotenoid. According to the results of analysis of variance, there are also significant differences (P < 0.05) in some treatments in different media. The greatest amount of carotenoid was observed at 150 mg/L CaCO3. In general, it can be said that the green algae, Scenedesmus quadricauda species, had high tolerance to changes in the acidity of the medium, along with chemical stresses caused by water hardness and presence of herbicide Metribuzin. Manuscript profile -
Open Access Article
29 - Effects of Salinity and Drought Stresses on Seed Germination and Seedling Growth of Desert Wheatgrass Agropyron desertorum
Hamid Reza Saeedi Goraghani Ghodrat Alah Heidary Mojtaba Solaimani Sardo -
Open Access Article
30 - بررسی پارامترهای مؤثر در تعیین تنش های پسماند در صفحات فلزی و چندلایههای کامپوزیتی با روش شیارزنی
محمود مهرداد شکریه سعید اکبری رکنآبادیروش شیارزنی یکی از روش­های پرکاربرد در اندازه­گیری تنش­های پسماند است که طی آن شیاری در چند مرحله در قطعه مورد نظر ایجاد شده و کرنش­های آزاد شده در هر مرحله به وسیله کرنش­سنج ثبت می­شود. ارتباط بین کرنش­های ثبت شده و تنش­های پسماند Moreروش شیارزنی یکی از روش­های پرکاربرد در اندازه­گیری تنش­های پسماند است که طی آن شیاری در چند مرحله در قطعه مورد نظر ایجاد شده و کرنش­های آزاد شده در هر مرحله به وسیله کرنش­سنج ثبت می­شود. ارتباط بین کرنش­های ثبت شده و تنش­های پسماند به وسیله ماتریس ضرایب نرمی صورت می­گیرد. در این تحقیق به کمک روش اجزای محدود، پارامترهای مؤثر در محاسبه مقادیر ضرایب نرمی برای صفحات فلزی ایزوتروپیک و همچنین چند لایه­های کامپوزیتی بررسی شده است. در ابتدا فرایند شبیهسازی برای صفحات ایزوتروپیک بهصورت دو و سه بعدی انجام گرفته است. نتایج بهدست آمده بیانگر تطابق کامل نتایج دو مدل است. برای محاسبه ضرایب نرمی نیاز به محاسبه کرنش متوسط در محل کرنش­سنج است. برای این کار از روش­های مبتنی بر کرنش و مبتنی بر جابهجایی استفاده شده است. همچنین با مقایسه ترک و شیار، تأثیر عرض شیار بر ضرایب نرمی بررسی شده است. سپس میزان کرنش ثبت شده توسط کرنشسنجهای با طول اندازهگیرهای مختلف مقایسه و مشخص شد با استفاده از کرنشسنج­های با طول اندازهگیر کمتر، میزان کرنش ثبت شده افزایش یافته و در نتیجه خطای اندازه­گیری کاهش مییابد. در نهایت با استفاده از مدل سه­بعدی ارائه شده ضرایب نرمی برای دو چندلایه­ای کامپوزیتی کربن- اپوکسی و شیشه- اپوکسی تعیین شده­اند. Manuscript profile -
Open Access Article
31 - Biotic and abiotic stresses in crop and medicinal plants
Mahdi Malekpour Abdolmajid LiaghatPlants are subjected to a variety of environmental stresses, which reduces and limits agricultural crop productivity. Environmental stresses that affect plants are of two types: biotic and abiotic stresses. Abiotic stress includes temperature, ultraviolet radiation, sal MorePlants are subjected to a variety of environmental stresses, which reduces and limits agricultural crop productivity. Environmental stresses that affect plants are of two types: biotic and abiotic stresses. Abiotic stress includes temperature, ultraviolet radiation, salinity, floods, drought, heavy metals, etc., which results in the loss of important crop plants globally, while biotic stress refers to damage caused by insects, herbivores, nematodes, fungi, bacteria, or weeds. Plants respond to all these environmental factors because the pants are fixed in a particular place. To cope with these stresses, a number of strategies have been developed by plants. They detect that the environmental stresses become activated and then generate the necessary cellular responses. Several investigations have been carried out to determine and understand plant assimilates partitioning and stress tolerance plant genotype necessary for the understanding of the complexity of the response of a plant to biotic and abiotic stresses. Manuscript profile