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Open Access Article
1 - Optimizing Product Combination in Continuous Production Companies
S. Savadkouhi F. Hosseinzadeh Lotfi M.r. Shahriyari M. Vaez-GhasemiThe optimum use of the upstream resources, production corresponding to the market demands, and structural constraints for the optimum production with the less wastes during the most rapid time required by the market which finally result in the more profit for the shareh MoreThe optimum use of the upstream resources, production corresponding to the market demands, and structural constraints for the optimum production with the less wastes during the most rapid time required by the market which finally result in the more profit for the shareholders are considered as the major objectives of this research. In this research, for the purpose of increasing the efficiency and optimum production, a model with a sequence proportional to the constraints of the problem is proposed by use of zero–one, integer programming based on the operational research science. The gained mathematical model is studied and verified with the actual data of Jam Polypropylene Co. and executed during monthly periods with one year planning horizon that the expected results of this research will realize during the term of study and assessment will result in increase of net profit, decrease in product storage, the faster responding the market demand corresponding to the profit of the company by taking the structural constraints of the factory and production into account. Manuscript profile -
Open Access Article
2 - Investigation of the effect of compatibilization of oxidized polypropylene in molten phase on the mechanical, physical, and morphological properties of reed plant flour-high density polyethylene composite
Mohammad Shamsian Mohammad Dahmardeh Ghalehno Fatemeh Dehdast Seyedeh Rahil ChalakehThis study aimed to investigate the possibility of making reed plant flour-high density polyethylene composite usingoxidized poly-propylene as a compatibilizer. For this purpose, reed plant flour, high density polyethylene, and oxidizedpoly-propylene compatibilizer in t MoreThis study aimed to investigate the possibility of making reed plant flour-high density polyethylene composite usingoxidized poly-propylene as a compatibilizer. For this purpose, reed plant flour, high density polyethylene, and oxidizedpoly-propylene compatibilizer in the specified value were mixed into the internal mixer for 6 min and after that, theresulting amorphous materials turned to the granules using a laboratory mill. Finally, the granules turned to reed-plasticplates using a hot press. Mechanical tests such as bending and tensile resistances and their modulus and physicalproperties such as water absorption and thickness swelling in 2 and 24 h were measured. A fourier transform infraredspectroscopy machine was used to check the modification of oxidized poly-propylene and the morphology of thecomposites was studied by electron microscopy images. The results demonstrated that with increasing thecompatibilizer, the mechanical properties were linearly increased, while the water absorption and thickness swellingwere decreased. Electron microscopy images showed that improved adhesion at the interface between the reed plantflour and polymer fibers. The Fourier-transform infrared spectroscopy also showed that due to the oxidation ofpolypropylene, hydrophilic regions are formed in it. Manuscript profile -
Open Access Article
3 - Investigation on the physical and morphological properties of the biocomposite manufactured by mixing treated OCC pulp fibers and polypropylene with various molecular weights
Mohammadreza Amiri margavi Mohammad Talaeipour AmirHooman Hemmasi Hemmasi Behzad Bazyar Ismaeil GhasemiIn this study, the effect of the chemical treatment of OCC pulp and polypropylene molecular weight on the physical and morphological properties of cellulosic biocomposite was studied. For this purpose, OCC fibers were treated with acetic anhydride and then mixed with po MoreIn this study, the effect of the chemical treatment of OCC pulp and polypropylene molecular weight on the physical and morphological properties of cellulosic biocomposite was studied. For this purpose, OCC fibers were treated with acetic anhydride and then mixed with polypropylene and the compatibilizing agent (0 and 3%). The ratio of fibers and polymer materials was considered 30 to 70, which was manufactured by the hot-pressing method at 180 °C. The ratio of fibers and polymer materials was considered 30 to 70, which was manufactured by the hot-pressing method at 180 °C. The water absorption, volumetric swelling, and contact angle were measured on each sample according to the ASTM standards. Fourier transform spectroscopy (FTIR) and scanning electron microscopy (SEM) were used to investigate the chemical modification of fibers and the morphology of biocomposites, respectively. The results of the measurements showed that the effect of chemical treatment and polypropylene on contact angle and water absorption was significant and chemical modification of the fibers reduced the water absorption and volumetric swelling. Finally, FTIR analysis showed that hydroxyl groups were decreased and the SEM images indicated the bond between fibers and polypropylene was improved through chemical modification of OCC fibers. Manuscript profile -
Open Access Article
4 - Study of Catalyst and Co- Catalyst Effect on Preparation of Lubricant from Heavy Propylene Tetramer (HPT)
Omid Moradi Mohammad Yari S. Sedaghat -
Open Access Article
5 - The Effect of Active Modified Atmosphere Packaging with Different Gas Composition on Physicochemical and Nutritional Compounds of (Agaricus bisporus) Mushroom
P. Rajaei L. Nateghi F. ZareiIntroduction: Today, mushrooms are used as a common food source in many countries. Edible mushrooms have a low shelf life. The aim of this study was to use modified atmosphere packaging with different ratios on the shelf life and nutritional value of button mushrooms.Ma MoreIntroduction: Today, mushrooms are used as a common food source in many countries. Edible mushrooms have a low shelf life. The aim of this study was to use modified atmosphere packaging with different ratios on the shelf life and nutritional value of button mushrooms.Materials and Methods: In this research, the mushroom samples were placed in polypropylene-covered packages, and the packaged were filled with gas mixtures of 100% oxygen, 25% oxygen with 75% nitrogen, 50% oxygen with 50% nitrogen, and also 25% oxygen, 25 the percentage of carbon dioxide and 50% of nitrogen were filled and packed. The control sample was button mushroom packed with polypropylene cover and without modified atmosphere (control).The investigated characteristics included the percentage of weight loss, the percentage of free amino acids, the percentage of ascorbic acid, the concentration of polysaccharides, the intensity of respiration, the ripening index, the browning coefficient, colorimetric characteristics and sensory characteristics on the first, fifth, tenth and fifteenth days of storage at 4ºC was evaluated.Results: The results showed that the weight loss indexes, free amino acids, ascorbic acid and brightness index of button mushroom significantly (p≤0.05) decreased during storage, and respiratory rate, browning coefficient, jaundice, and redness significantly (p≤0.05) increased. All sensory indicators of texture, spoilage and bad smell, appearance color and overall acceptance also faced a significant decrease during 15 days of packaging (p≤0.05). Among button mushroom treatments, gaseous conditions of 25% oxygen, 25% carbon dioxide and 50% nitrogen had the least amount of changes during the storage time compared to the first day and showed a higher ability to protect button mushroom, and the control treatment had the highest Drop rate over time. Also, the treatment of 25% oxygen with 75% nitrogen and the treatment of 50% oxygen with 50% nitrogen did not show significant differences during 15 days of storage (p>0.05). Conclusion: Finally, packaging with gaseous conditions of 25% oxygen, 25% carbon dioxide and 50% nitrogen was introduced as the optimal treatment. Manuscript profile -
Open Access Article
6 - A Study on the Effect of Nanosilicate-Based Coatings on Storage Life of Pomegranate Cultivar Malas-E-Saveh
A. Bekran E. Seifi F. VarastehIntroduction: The high nutritional and medicinal values and the increasing production anddemands, it is important to control the factors affecting the quality of pomegranate fruitduring storage. Regarding the understanding of how to store pomegranate fruit, it would bep MoreIntroduction: The high nutritional and medicinal values and the increasing production anddemands, it is important to control the factors affecting the quality of pomegranate fruitduring storage. Regarding the understanding of how to store pomegranate fruit, it would bepossible to offer this product at local and international markets for a long duration with highquality.Materials and Methods: In this study, the effect of nano silicate-based polyethylene andpolypropylene on the storage life of pomegranate fruit (cultivar Malas-e-Saveh) has beenstudied in a completely randomized factorial design. The treated fruits were stored in commonstorage for two and four months period. Qualitative and quantitative characteristics of fruitswere measured using the standard methods of analysis.Results: The results showed that the nano-based polyethylene and polypropylene couldmaintain the highest amount of moisture in the skin (75.72% and 73.14%, respectively) ascompared to the control (26.64%) at the end of storage period. These coating treatments alsomaintained the highest amount of aril moisture (76.88%) as compared to the control(71.09%). After storage period, the nano-based polypropylene showed the highestconcentrations of phenolic compounds (883.54 mg GAE/100 ml), flavonoids (487.71 mgGAE/100 ml) and anthocyanins (11.69 mg C3GE/100 ml) as compared to the control (649.76and 437.56 mg GAE/100 ml, and 7.9 mg C3GE/100 ml, respectively); although the normalcoating treatments showed less influence. Nano-based coating treatments also decreased thechanging rate of ascorbic acid but did not have any significant influence on pH and EC.Conclusion: The application of nano-based polyethylene and polypropylene treatments isrecommended to improve the keeping quality of pomegranate fruit during storage. Manuscript profile -
Open Access Article
7 - The effect of some parameters in the formulation of Lavash bread and its shelf life extension
B. Hejazi M. Mizani M. MohamadzadehIntroduction: Different types of bread and in particular Lavash type produces a considerable amounts of waste generaly. In this study, integrated strategies to deal with the waste of this type of bread have been studied. By changing the formulation and adding functional MoreIntroduction: Different types of bread and in particular Lavash type produces a considerable amounts of waste generaly. In this study, integrated strategies to deal with the waste of this type of bread have been studied. By changing the formulation and adding functional additives to bread, industrially produced and the use of appropriate packaging to reduce the staling and microbial contamination are the objects of this research work.Materials and Methods: Effect of natural anti-stagnation agents (including sprouted wheat powder, guar gum, kappa carrageenan) in concentrations of 0 to 0.3% and antimicrobial compounds (black cumin extract and propionic acid), maximum 0.5 ml with the package polypropylene packaging classification on the shelf life of industrial Lavash bread has been investigated. The physicochemical properties of flour (moisture, ash, pH, protein, wet gluten, Zeleny number, fall, and fat number) and rheological properties of dough produced in sixteen different formulations (such as water absorption, elasticity, maximum viscosity of the return factor) were tested. Using statistical optimization techniques, optimal treatments were determined. The treatments were produced, baked and packaged industrially, using black cumin extract and propionic acid. A control sample was also produced to compare the results. Series of microbial, textural and sensory evaluations according to the standards were carried out on the samples during storage at room temperature after production and ten and twenty days’ intervals.Results: The rate of fall in the initial flour sample was high and by adding 0.3% germinated wheat powder reached the appropriate level for the production of industrial Lavash bread. Two types of optimal formulations were obtained, of which with the shelf life of more than 10 days, that included 0.208% germinated wheat powder, 0.037% guar, and 0.055% kappa carrageenan with cumin extract and acid propionic was selected.Conclusion: By using the industrial production line, proper packaging, and formulation of raw materials for Lavash bread, which is known as the most widely used bread in Iran, a positive step can be taken to reduce the amount of waste in this bread and improve its quality. Manuscript profile -
Open Access Article
8 - Enhancing the efficiency of modified polypropylene fumarate (PPF) membrane by graphene oxide / pluronic F68 additive for wastewater treatment of ceramic factories
ehsan ghorban nejad ali arasteh nodeh susan khosroyar mahmoodreza khadangiBackground and Objective: Due to the fact that the wastewater of ceramic factories have higher TDS and turbidity, Poly propylene fumarate (PPF) membranes seems to be suitable for the treatment of this type of wastewater due to their good mechanical performance, adjustab MoreBackground and Objective: Due to the fact that the wastewater of ceramic factories have higher TDS and turbidity, Poly propylene fumarate (PPF) membranes seems to be suitable for the treatment of this type of wastewater due to their good mechanical performance, adjustable biodegradability and easy production. However, the main disadvantage of the PPF in membrane separation related to hydrophobicity property of it which leads to a low membrane flux and is easily susceptible for fouling. Presence of oxygenated functional groups such as hydroxyl, epoxy, and carboxyl in GO causes the modified membranes have high effective flux and better antifouling property. One of main problem associated with preparation of membranes containing GO is possibly related to the more homogenous dispersion of GO into the polymer matrix. The presence of Pluronic F-68 can solve this problem. Material and Methodology: In this work, in order to improve the hydrophilic and morphological properties of PPF membrane, the graphene oxide that has been modified by Pluronic F-68 was added in to the membrane. These membranes were prepared with VIPS method. The effects of the modified additive concentrations and vapor exposure times on hydrophilicity and permeation flux of the PPF membranes in mentioned wastewater treatment were investigated. Findings: Increasing GO/Pluronic F-68 loading from 0 wt. % to 4 wt. %, the hydrophilicity level is increased and the contact angle is decreased by increasing the exposure time up to 30 min due to the high poros­ity of membranes than others. The modificated membranes by Pluronic F-68 /GO present higher pure water permeability in comparison with the neat PPF mem­brane. Discussion and Conclusion: These membranes have higher pure water permeability in comparison with the neat PPF mem­brane. The membrane modified with 4wt. % of GO/Pluronic F-68 (Exposure time of 20 min) has high ability in reduction of wastewater pollution indices in comparison with others. Manuscript profile -
Open Access Article
9 - بررسی خاصیت آنتی اکسیدانی عصاره های اتانولی، پروپیلن گلایکولی و گلیسرولی گیاه Helichrysum oocephalum Boiss
عالمه سرایانی ندا امینیHarmful chemicals, exposure to various types of radiation, and lifestyle changes have disrupted the oxidative balance in the body, as a result of which the amount of free radicals has increased, and this increase has a direct role in causing various diseases such as can MoreHarmful chemicals, exposure to various types of radiation, and lifestyle changes have disrupted the oxidative balance in the body, as a result of which the amount of free radicals has increased, and this increase has a direct role in causing various diseases such as cancer. Therefore, it is very necessary to identify compounds with antioxidant properties, since plants are rich in antioxidant compounds and are available to people, so the present study was conducted with the aim of investigating the antioxidant properties of Helichrysum oocephalum Boiss plant extract. In this research, after collecting the plant, its aerial parts and roots were powdered, then extraction was done by maceration method. For this purpose, three different solvents (propylene glycol, ethanol and glycerol) were used and the concentrations were 2.5, 5, 10, 20 and 40 mg/ml were obtained from propylene glycol, ethanol and glycerol extracts. Finally, the antioxidant properties of the extracts were measured using the DPPH test. Using the IC50 test, the concentration of the extract, which has antioxidant properties, was obtained. The results showed that the propylene glycol extract of the plant at a concentration of 40 mg/ml has the highest antioxidant properties, while the glycerol and ethanol extracts were ranked next. Statistical analysis also showed a significant difference (P<0.05). Also, the IC50 value for propylene glycol extract is equal to 12.40, which shows the high antioxidant power of the desired extract compared to the control, and the ethanol and glycerol extracts are after the propylene glycol extract, respectively. It seems that the propylene glycol extract of the plant at a concentration of 40 mg/ml can be used as an antioxidant compound in various industries including pharmaceuticals. Manuscript profile -
Open Access Article
10 - A Facile Strategy for Synthesis of Well-defined Polypropylenegrafted-polystyrene /MMT Nanocomposite Using Reversible Addition: Fragmentation Chain Transfer Polymerization and Solution Intercalated Method
Saber Ghasemi Karaj-Abad Parisa Shamsno Mojtaba Abbasian Mehdi Hosseinzadeh Solmaz Esmaeily Shoja -
Open Access Article
11 - Preparation of Cerium-Hierarchical SAPO-34 Catalyst and Presentation of a Kinetic Model for Methanol to Propylene Process (MTP)
Masoumeh Ghalbi-Ahangari Ali Taheri-Najafabadi Parviz Rashidi-Ranjbar Zahra Taheri -
Open Access Article
12 - Creep Evolution Analysis of Composite Cylinder Made of Polypropylene Reinforced by Functionally Graded MWCNTs
A Loghman H Shayestemoghadam E Loghman -
Open Access Article
13 - فرآیند تقویت فیلتر تصفیه آب خانگی با نانو ذرات گیاهی
محبوبه شادابی بجند مهداد انکاری استفاده از نانو به عنوان کاهش دهنده آلاینده‎های آب آشامیدنی، به عنوان یکی از راه‎کارهای مدیریتی مطرح گردیده است. یکی از موارد این فناوری در ارتباط با کیفیت آب شرب می‎باشد. از این رو هدف از ارائه این پژوهش استفاده از نانو ذرات گیاهی (گیاه آ More استفاده از نانو به عنوان کاهش دهنده آلاینده‎های آب آشامیدنی، به عنوان یکی از راه‎کارهای مدیریتی مطرح گردیده است. یکی از موارد این فناوری در ارتباط با کیفیت آب شرب می‎باشد. از این رو هدف از ارائه این پژوهش استفاده از نانو ذرات گیاهی (گیاه آلوئه‎ورا) برای تقویت کردن فیلتر تصفیه‎های آب خانگی از جنس الیاف پلی‎پروپیلن است. طی تجزیه و تحلیل بدست آمده بر روی گیاه آلوئه‎ورا به عنوان تقویت کننده فیلتر، نتایج نشان داد که از پارامترهای مرتبط با فیلتر تصفیه آب خانگی که این فیلتر از لحاظ میزان جرم و ضخامت الیاف پلی‎پروپیلنی تقویت شده و میزان فشار حباب، قطر روزنه و قطر میانگین روزنه دارای ضخامت شاخص‎های درونی مناسب می‎باشد. همچنین مقادیر پارامترهای کیفی ( نیترات، نیتریت، سولفات، کلراید، فلوراید، سدیم، پتاسیم، سختی، EC، TDS و کدورت) بعد از خروج از دستگاه تصفیه آب با نانو ذرات گیاهی نسبت به کیفیت آب ورودی به دستگاه تصفیه آب کاهش به سزایی داشته است. در بررسی میزان تاثیرگذاری این فیلتر تقویت شده با گیاه آلوئه‎ورا مشخص گردید که این فیلتر دارای قدرت مناسب در حذف پارامترهای فیزیکی و شیمیایی آب است که میتوان از آن در تصفیه آبهای آلوده مورد استفاده در فرایندهای خانگی و شرب استفاده کرد. Manuscript profile -
Open Access Article
14 - Effect of Basalt and Polypropylene Fibers on Unconfined Compressive Strength of Cement-Stabilized clay, an Experimental Approach
Seyed Hadi Sahlabadi Meysam Bayat Mohsen Mousivand Mohsen Saadat -
Open Access Article
15 - Development of Fiber Reinforced SCM for Sustainable Construction
Iman Mehdipour Nicolas Ali Libre Mohammad Shekarchia -
Open Access Article
16 - Effect of Polypropylene Fibers on Strength and Thermal Resistance of Concrete
Jamal Ahmadi Hossein Aghajanloo -
Open Access Article
17 - Investigating the effect of diluents contained EDTA and Propylene glycol on survival of Ghezel ram frozen semen
parisa Shafaati Gholamali Moghaddam hossein daghighkia sadegh AlijaniThe present study was performed to evaluate the effect of adding different levels of EDTA and propylene glycol on quality and survival of Ghezel ram frozen semen. After primary evaluations on fresh semen for parameters including total motility, progressive motility, non MoreThe present study was performed to evaluate the effect of adding different levels of EDTA and propylene glycol on quality and survival of Ghezel ram frozen semen. After primary evaluations on fresh semen for parameters including total motility, progressive motility, non-progressive motility, viability, abnormal sperm, and acrosome integrity in total cell and acrosome integrity in dead cells, samples with a concentration of 2.5 billion sperm and a progressive motility of over 70% and a volume greater than 0.5 ml were diluted with 1, 1.5, 2, 2.5 mM EDTA and 1, 2, 3% propylene glycol as an additive and propylene glycol 7% as a constitute. Straws (250 µl) were filled with dilution and were placed in a refrigerator for 1.5 to 2 hours to cool to reach 5°C. After cooling they are placed in 4-5 cm above nitrogen for 8-10 minutes and ultimately were immersed in liquid nitrogen. qualitative parameters of sperm included viability, total motility, progressive and non-progressive motility, hypo osmotic swelling test, percentage of acrosome integrity and acrosome health in dead cells were investigated in 0, 20, 40 and 60 days of freezing processes. The results of this experiment showed that diluent with 1% propylene glycol concentration in comparison with other group improved total and progressive motility, percentage of viability, acrosome integrity and HOST (p0.05). The results showed that dilutions of EDTA and propylene glycol could improve quantitative parameters of ram semen. Manuscript profile -
Open Access Article
18 - Synthesis of Nanostructured MnNiAPSO-34 Catalyst: Catalytic Properties and Performance
Parisa Sadeghpour Mohammad Haghighi -
Open Access Article
19 - Effect of Different Fibers and Pozzolanic Materials on the Properties of non - structural Concrete(Foam Concrete)
Mahyar Kaveh Reza FarokhzadFoam concrete is new cover for several usages in building industry that is very useful because of its unique specification. The high value of strength to weight ratio, low Thermal conductivity Coefficient and the high Heat insulation and soundproof ability is the most a MoreFoam concrete is new cover for several usages in building industry that is very useful because of its unique specification. The high value of strength to weight ratio, low Thermal conductivity Coefficient and the high Heat insulation and soundproof ability is the most advantage of this type concrete. In this investigation we use Polypropylene fibers, Synthetic fibers, rice husk ash and nano silica to improve the foam concrete abilities. The fibers are used as additive and rice husk ash & nano silica are replaced as cement. The compressive strength test, tensile strength test and lentgh change test are performed on all foam concretes. Maximum compressive strength belongs to designs containing 1% synthetic fibers and 1% nano-silica. Finally, it was determined that rice paddy ash in 5% replacement has a 9% increase in compressive strength of 28 days and a 17% increase in tensile strength of 28 days. Compressive strength is not affected by Polypropylene fibers in 0.1% and 0.2%, and in 0.3%, compressive strength decreases. Adding 1% of synthetic fiber to concrete foam has 17% growth in compressive strength and 75% growth in tensile strength. Adding 1% nano-silica to foam concrete has a 20% growth in compressive strength and 38% growth in tensile strength. Nanosilica and rice husk ash decreased by 21% and 9% decrease in concrete shrinkage due to decreased absorption of foam concrete. Polypropylene and synthetic fibers cause 6 to 15% reduction in the contraction due to concrete drying. Manuscript profile -
Open Access Article
20 - Evaluation of Rheological and Mechanical Properties of Lightweight Concrete Containing Different Percentages of Polypropylene and Zeolite Fibers
Abdolkarim Abbasi Dezfouli Rezbeh AghajaryLightweight concrete is one of the most important and efficient materials in the modern construction industry and has a variety of applications. Proper application of lightweight concrete can have many positive influences on the construction process of concrete structur MoreLightweight concrete is one of the most important and efficient materials in the modern construction industry and has a variety of applications. Proper application of lightweight concrete can have many positive influences on the construction process of concrete structures. The possibility of application in the most geographical regions, utility of natural and cheap materials, high speed, low cost compared to the large volume of operations and its ductility due to the geometric shapes of the design, good performance and very high resistance, resistant to compressive forces and tensile strength, energy absorption and cracking stability are the prominent features of lightweight structural concretes. The main purpose of this research was to investigate the rheological and mechanical properties of the lightweight concrete containing different percentages of zeolite and polypropylene fiber separately. In this research, applying laboratory method, the rheological properties of fresh lightweight concrete (soft concrete) and the mechanical properties of hardened lightweight concrete at the ages of 7 and 28 days have been evaluated. According to ASTMC 39 standard, two samples of lightweight concrete without zeolite and polypropylene at the ages of 7 and 28 days have been prepared and mechanically evaluated. Then, in continuation of preparing of the light concrete samples prepared based on ASTMC 39 standard, three mixing designs with different percentages of polypropylene fibers (0.9, 1 and 1.1%) and 3 mixing designs with different percentages of zeolite (5, 10 and 15%) , at the mentioned ages were examined and compared with the base samples in the laboratory, which resulted in the following findings: Lightweight concrete samples containing zeolite had a higher electrical resistance than lightweight concrete samples containing polypropylene and the highest compressive strength was related to lightweight concrete samples containing 15% zeolite. This is equivalent to 400.75 kg / cm3 at the age of 28 days. Manuscript profile -
Open Access Article
21 - Olefin production from catalytic cracking of light fuel oil over different additives
Ali Afshar Ebrahimi Sara Tarighi -
Open Access Article
22 - Laboratory evaluation on the effectiveness of polypropylene fibers on the strength behavior of CKD-stabilized Soil
Sadegh Ghavami Hamid Jahanbakhsh Fereidoon Moghadas Nejad -
Open Access Article
23 - Investigating the antimicrobial effects of textiles impregnated with ginger plant extract on some pathogenic microbes
Hamidreza Karimi Mohhamadreza Basiri Zahra DarabIn this article the antimicrobial effects and activity of the polypropylene fabrics used in medical textiles impregnated with ginger plant extract with the scientific name Zingiber officinale Rosc from the ginger family were investigated. For this purpose the fabrics ar MoreIn this article the antimicrobial effects and activity of the polypropylene fabrics used in medical textiles impregnated with ginger plant extract with the scientific name Zingiber officinale Rosc from the ginger family were investigated. For this purpose the fabrics are impregnated with aqueous, methanol and ethyl acetate extracts of ginger, and then the antimicrobial effect of the prepared fabrics on the microbes S. aureus, C. albicans, B. cereus, E. aerogenes, E. coli, B. subtilis, P. vulgaris were investigated. For anti-microbial tests, the growth inhibition halo diameter measurement method and disk blank were used. Each experiment had three simultaneous repetitions. For each repetition four petri dishes were considered. Statistical analysis of the results was done by comparing the mean of repetitions (Duncan's test). The results showed that ginger extracts have an inhibitory effect on all the microorganisms used in this research, and it can be considered an effective plant against microbes. Manuscript profile -
Open Access Article
24 - Electrically Conductive nanocomposite foam with electromagnetic wave absorption and shielding ability based on EPDM rubber and MWCNT: Effect of foam morphology and electrical conductivity
Hasti Bizhani Ali Asghar KatbabIn the present study, electromagnetic wave absorber nanocomposite foams based on Ethylene-propylene-diene-monomer (EPDM) and multi-walled carbon nanotubes (MWCNT) were fabricated using a chemical blowing agent and compression molding. Foam nanocomposites showed lower el MoreIn the present study, electromagnetic wave absorber nanocomposite foams based on Ethylene-propylene-diene-monomer (EPDM) and multi-walled carbon nanotubes (MWCNT) were fabricated using a chemical blowing agent and compression molding. Foam nanocomposites showed lower electrical percolation threshold and higher electromagnetic wave absorption compared to their solid counterparts. Above the percolation threshold, the foam nanocomposites show a shielding effectiveness of 28-45 dB in the X-band frequency range (8.2- 12.4 GHz). It was shown that the dominant shielding mechanism is absorption for the prepared foams. Also, the electromagnetic shielding effectiveness of the foam was insignificantly affected under repeated bending. Our results indicate the high potential of cross-linked EPDM/MWCNT foams as a lightweight electromagnetic wave absorber with high flexibility and deformability. Manuscript profile -
Open Access Article
25 - Comparative Effects of Benzyl Ester and Propylene Glycol Administration on Quantitative Indices of Rat Seminiferous Tubules
Atarod Sadat Mostafavinia Zahra Nadia Sharifi Mahnaz Nouri Parsa Nazari Fatemeh Mohammadi Parmida Seraj Seyed Mohammad Hossein Noori MugahiAccording to highlighted role of men in family planning, the use of reversible methods of contraception with no adverse effects on androgen-dependent metabolic reactions is very important. In order to achieve a conductor combination in the designing contraceptive drugs, MoreAccording to highlighted role of men in family planning, the use of reversible methods of contraception with no adverse effects on androgen-dependent metabolic reactions is very important. In order to achieve a conductor combination in the designing contraceptive drugs, in the study, the effect of two drugs: Propylene glycol and Benzyl Ester on histological parameters of seminiferous tubules was investigated. This study was conducted on the 33 rats Sprague-Dawley with weighing 250-300 gr and least 100 days. Then they were divided into a group containing 13 rats and two groups containing 10 rats and were Received respectively 15 mg/kg of Propylene glycol and Benzyl Ester and Normal Saline as subcutaneous injection daily for 60 days. Next, samples of testicular fixative were stained by the usual method (H&E) and Histological parameters of seminiferous tubules were measured through stereometry and morphometry methods. Reduce the Diameter and Perimeter of seminiferous tubules in the group of Benzyl Ester had significant difference with the two other groups while there was not noticeable difference among the three studied groups in terms of seminiferous tubules number. Benzyl ester was more effective on Histological parameters of seminiferous tubules. Thus, with eliminating the cardiovascular effects and Conservation the contraceptives properties, it can be used as a guide combination. Manuscript profile -
Open Access Article
26 - بررسی تجربی و عددی ضخامت قطعه بر میزان جمع شدگی و عدم گردی قطعات استوانه ای در فرآیند تزریق پلاستیک
ناتان جعفریان جم پیام سرائیان آیت اله عرب امین ابادیفرآیند تزریق پلاستیک، یکی از مهم­ترین روش­های شکل­دهی در صنعت تولید پلاستیک­ها می­باشد. جمع­شدگی و عدم­گردی پدیده­هایی هستند که کیفیت نهایی محصول را تحت تأثیر قرار می­دهند. در این تحقیق تأثیر ضخامت قطعه استوانه­ای از جنس پلی­پ Moreفرآیند تزریق پلاستیک، یکی از مهم­ترین روش­های شکل­دهی در صنعت تولید پلاستیک­ها می­باشد. جمع­شدگی و عدم­گردی پدیده­هایی هستند که کیفیت نهایی محصول را تحت تأثیر قرار می­دهند. در این تحقیق تأثیر ضخامت قطعه استوانه­ای از جنس پلی­پروپیلن بر میزان جمع­شدگی و عدم­گردی بررسی شده­است. بنابراین با استفاده از نرم­افزار MOLDFLOW، فرآیند تزریق پلاستیک برای جمعشدگی و عدم­گردی، شبیه­سازی و تحلیل می­شود. سپس یک قالب تزریق پلاستیک پنج­حفره­ای از قطعات استوانه­ای توخالی با پنج ضخامت مختلف ساخته شده و با استفاده از یک دستگاه تزریق پلاستیک، حداقل 5 نمونه از قطعات تولید می­شود. در ادامه ابعاد نمونه­های تولید شده توسط دستگاه اندازه­برداری سه­بعدی نوری اندازه­گیری شده و میانگین جمع­شدگی ابعادی هر نمونه به­دست می­آید. با انجام این تحقیق نتیجه می­گیریم که با افزایش ضخامت قطعه، میزان جمع­شدگی و عدم­گردی افزایش می­یابد و دلیل آن، آهسته­تر سرد شدن پلیمر مذاب با افزایش ضخامت قطعه و داشتن زمان بیشتر برای تشکیل بلور است. بلورینگی بیشتر ماده موجب جمع­شدگی و عدم­گردی زیادتری می­شود. در پایان نتایج شبیه­سازی با نتایج تجربی مقایسه می­شوند و مشاهده می­شود که که نتایج تجربی و نتایج شبیهسازی تطابق خوبی با هم دارند. Manuscript profile -
Open Access Article
27 - Investigating the mechanical properties of the composite made of polypropylene and Conocarpus wood flour
Amir Mohammadinia parizad sheikhiThe current research, the possibility of making composite from Conocarpus wood flour-based polypropylene was investigated. Conocarpus erectus is an imported species that has been cultivated in the southern provinces of the country like Khuzestan province, and as a ligno MoreThe current research, the possibility of making composite from Conocarpus wood flour-based polypropylene was investigated. Conocarpus erectus is an imported species that has been cultivated in the southern provinces of the country like Khuzestan province, and as a lignocellulosic source has not yet been investigated in making wood-plastic composites. Wood flour-based polypropylene composite with different flour weight fractions (0, 10, 20. 30 and 40%) and constant 4% maleated polypropylene (MAPP) coupling agent have been fabricated using extrusion injection molding process. The effect of wood flour content has been compared with neat polypropylene specimen. Based on the results, with the increment in the proportion of wood flour, the density and mechanical properties showed a significant increase, except for the impact resistance, but no statistically significant difference was observed between the specimens containing 10 to 30% by weight of wood flour. The highest density and mechanical resistances were obtained in the products containing 40% by weight of wood flour. The impact resistance was significantly reduced with the addition of 10% wood flour, and the increase of wood flour from 10 to 40% had no significant effect. Electron microscope images of the fracture surface of the samples were also used to investigate the distribution of wood flour particles in the polymer matrix. In these images, both the overlapping of particles by polymer and the accumulation of wood flour can be seen. Manuscript profile
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