Psycology
Nasim Gholipour; Abalfazl Amiripour
Abstract
Adolescence is a critical period of life after childhood that causes certain changes in the body, motivations, emotions. According to Piaget, it occurs when a person moves from the stage of objective operations to formal operations of self-centeredness. At this stage, the adolescent has difficulty distinguishing ...
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Adolescence is a critical period of life after childhood that causes certain changes in the body, motivations, emotions. According to Piaget, it occurs when a person moves from the stage of objective operations to formal operations of self-centeredness. At this stage, the adolescent has difficulty distinguishing between his or her own abstract views and those of others. One of the states of cognitive distortion in adolescents is the personal myth that at this stage he thinks is in the center of everyone's attention and has an impact on individual decisions and risky behaviors that can affect the general health of adolescents. In the present study, the relationship between personal myth, early maladaptive schemas and general health of third year male and female high school students in Islamshahr has been investigated. For this purpose, 300 students (136 boys and 164 girls) who were selected by cluster random sampling method answered three questionnaires of personal myth, Young's early maladaptive schemas and general health. Mean and standard deviation, Pearson correlation coefficient, stepwise multiple regression, independent t-test and multivariate analysis of variance were used to analyze the data. The results showed that there is a statistically positive and significant relationship between personal myth, early maladaptive schemas and general health, but a negative and significant relationship conceptually. According to the stepwise regression model, it was found that fourteen after the initial maladaptive schemas and personal myths were able to predict general health and were able to explain 90% of the variance of general health variables.
Clinical Medicine
Mansour Rezaei; Ramin Azhough
Abstract
Introduction: Diosmin is effective in inhibiting the inflammatory response pathways and improving the acute and chronic symptoms of hemorrhoids. Very few studies have been conducted in this field, and the effectiveness of this drug in different studies has not been presented in a single study so that ...
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Introduction: Diosmin is effective in inhibiting the inflammatory response pathways and improving the acute and chronic symptoms of hemorrhoids. Very few studies have been conducted in this field, and the effectiveness of this drug in different studies has not been presented in a single study so that it can be used or not used based on its results. Therefore, the present study aims to investigate the effectiveness of Diosmin on pain after hemorrhoidectomy in the form of a systematic review of clinical trial studies.Methods: The present study was a systematic review that was designed and conducted based on the PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analysis) statement. The search was done in SID, Magiran, Embase, PubMed, Cochrane Library, Scopus, and Web of Science databases by following the entry and exit criteria and the keywords such as pain, hemoroide, hemorrhoidectomy, Diosmin, surgery, and post-operative.Results: 824 patients participated in these 4 randomized clinical trial studies (with a high quality). The instrument used to assess pain intensity in all studies was the Visual Analogic Scale. Diosmin tablets were prescribed in two forms: 500 mg (in three studies) and 300 mg (in one study) after hemorrhoidectomy. In three studies, Diosmin tablets led to a reduction in pain intensity after hemorrhoidectomy, and in one study, no significant difference was seen.Conclusion: The results of our study indicated that the use of 500 mg Diosmin oral tablets can lead to a reduction in pain intensity after hemorrhoidectomy. Due to the lower number of studies, the results of this study should be used with caution.
Psycology
Farzaneh Shiralinejad; Azam Hamedi; Hamideh Amadi; Siamak Ahmadi
Abstract
The present study was conducted with the aim of investigating the spiritual status and organizational commitment of elementary school teachers. It was an applied survey study and its statistical population included all elementary school teachers of district 1 in Kerman City which included a total of ...
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The present study was conducted with the aim of investigating the spiritual status and organizational commitment of elementary school teachers. It was an applied survey study and its statistical population included all elementary school teachers of district 1 in Kerman City which included a total of 1050 subjects. Simple random sampling was used in this study and the sample size was 285 subjects. Two questionnaires were used for data collection: a researcher-made spirituality questionnaire that included 13 questions with a Likert Scale of 5 which was an extraction of Kenda nd Foreman's (2010) questionnaire and Allen and Mayer's organizational commitment questionnaire (1993) which included 18 questions with a Likert Scale of 5. The content validity and reliability of the questionnaires were estimated by Cronbach's alpha. Descriptive and inferential statistics including one sample t –test and regression test were used for data analysis. Results of the one sample t-test showed that the teachers had a high level of spirituality and organizational commitment. In addition, results of the regression test showed that spirituality has managed to predict 0.91 of the teachers' organizational commitment.
Basic Medicine
Jaya B Puri; AbdulBasit M.A. Shaikh; Umesh Pravin Dhuldhaj
Abstract
In the present study, we have collected the leucocephala seeds which are seasonal and having good amount of oil content. The oil seeds can be used as the one of the adulterant for the coffee. The whole plant having importance for human being, it could be as the food or furniture. The immature seeds, ...
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In the present study, we have collected the leucocephala seeds which are seasonal and having good amount of oil content. The oil seeds can be used as the one of the adulterant for the coffee. The whole plant having importance for human being, it could be as the food or furniture. The immature seeds, pods and flower buds are used as the salad while the gum obtained from this plant can be used for the confectionary, pharmaceutics, and cosmetics industry. In some of the region, it is considered as the recalcitrant and attracts rodents. The plant is well-known in traditional medicine and seeds are the rich source of several necessary metabolites such as proteins, tannins, carotene, leucenol, and flavonol glycosides and having therapeutic potential like anti-inflammatory and antidiabetic activity. Hence, in our present investigation, we focus for the collection of seeds, and extraction of oil and its characterizations. The dried pods and seeds were collected from Waghi Village, near Nanded, Maharashtra. The obtained extract were further characterized for the confirmation of oil content by measuring lipid content, specific gravity, density, protein, and glucose content, and further analysis with thin layer chromatography. The obtained extract is also subjected to the anti-microbial activity.
Clinical Medicine
Mojtaba Ghaedi; Elham Javidmehr; Navid Kalani; Hasan Zabetian
Abstract
Background: To relieve the pain caused by propofol injection, a wide range of medicinal and non-pharmacological methods have been investigated. The present study was conducted with the aim of comparing two drugs, ephedrine and dexamethasone, on the pain caused by propofol injection in patients undergoing ...
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Background: To relieve the pain caused by propofol injection, a wide range of medicinal and non-pharmacological methods have been investigated. The present study was conducted with the aim of comparing two drugs, ephedrine and dexamethasone, on the pain caused by propofol injection in patients undergoing elective surgery.Methods: This double-blind randomized clinical trial study was conducted on 60 patients who were candidates for elective surgery referred to Peymaniyeh Hospital in Jahrom City. Patients were divided into two groups A: dexamethasone with a dose of 8 mg/kg and group B: ephedrine with a dose of 5 mg using a table of random numbers. Dexamethasone and ephedrine were injected within 5 seconds, and after 30 seconds, propofol 1% in the amount of 3 ml (equivalent to 30 mg) was injected into the corresponding vein at a speed of 0.5 ml per second. After the injection, the patient was clearly asked about pain or discomfort at the injection site, and the answer was yes or no, and if there was pain, its severity was recorded in the questionnaire based on verbal descriptions. The data was analyzed using SPSS Software (version 21) and using descriptive (frequency, number, standard deviation, and mean) and inferential (Chi-square test) statistics. P<0.05 was considered as significant.Findings: 60 patients included in the study were divided into two groups of 30 dexamethasone and ephedrine. There was no statistically significant difference between both groups in terms of demographic characteristics (age, gender, and weight) and they were the same. Comparing the pain made by propofol injection in dexamethasone and ephedrine groups, using the Chi-square test, showed that the frequency of pain in the ephedrine group (33.3%) was not significant compared with dexamethasone group (40%) (P=0.23).Conclusion: Based on the results of the present study, although more people in the ephedrine group were pain free, the amount of pain in the ephedrine and dexamethasone groups was not statistically significant.
Basic Medicine
Mohammad Irajian; Seyed Hamed Ghaffari
Abstract
Introduction: Carpal Tunnel Syndrome (CTS) has garnered attention in previous research for its potential association with diabetes mellitus. It has been suggested that CTS may occur more frequently in individuals with diabetes, and this connection might be influenced by factors such as the duration of ...
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Introduction: Carpal Tunnel Syndrome (CTS) has garnered attention in previous research for its potential association with diabetes mellitus. It has been suggested that CTS may occur more frequently in individuals with diabetes, and this connection might be influenced by factors such as the duration of diabetes, microvascular complications, and the level of glycaemic control. The primary objective of this study was to investigate whether Type 2 diabetes could be conclusively identified as a bona fide risk factor for the development of carpal tunnel syndrome, even after accounting for potential confounding variables.Material and Methods: This retrospective case-control study harnessed data sourced from electronic patient records at Tabriz university of medical scenes. We focused on patients who received a diagnosis of carpal tunnel syndrome within the timeframe spanning from January 2011 to July 2012. This cohort was then compared to a control group comprising patients diagnosed with herniated nucleus pulposus.Results: We observed that the prevalence of Type 2 diabetes was higher among patients with carpal tunnel syndrome, accounting for 11.5% of this group, compared to 7.2% in the control group (Odds Ratio 1.67, with a 95% confidence interval ranging from 1.16 to 2.41). However, after conducting multivariate analyses while adjusting for gender, age, and body mass index, Type 2 diabetes did not emerge as a statistically significant, independent risk factor for carpal tunnel syndrome (Odds Ratio 0.99, with a 95% CI spanning from 0.66 to 1.47).Conclusion: Although our study revealed a higher prevalence of Type 2 diabetes among individuals with carpal tunnel syndrome, this condition could not be unequivocally identified as an independent risk factor for the development of carpal tunnel syndrome when adjusting for potential confounding variables. These findings suggest that other factors may play a more prominent role in the onset of carpal tunnel syndrome, and further research is warranted to explore these associations in greater detail.
Basic Medicine
Parmiss Adyani Kalvanagh; Yousef Adyani Kalvanagh
Abstract
Introduction: According to researchers' research on the relationship between breast cancer and diabetes in the presence of other genes such as INSR, the aim of this study was comparing exons 2 and 3 of the DIRAS3 gene in mastectomies and lumpectomies women.Procedure: DNA extraction was done using a kit ...
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Introduction: According to researchers' research on the relationship between breast cancer and diabetes in the presence of other genes such as INSR, the aim of this study was comparing exons 2 and 3 of the DIRAS3 gene in mastectomies and lumpectomies women.Procedure: DNA extraction was done using a kit (PZP Molecular IVD Company) and stored in a micro tube at -20C. The said kit contained four different buffers named Wash buffer (W), Binding buffer (B), Elution buffer (E) and Removal buffer (R) along with proteinase k powder.Results: The polymorphism found in intron 2 with rs6682360 at position c.332-3 T>C or g.831 T>C of a cancer patient sample, that is, 3 nucleotides upstream of the 332nd nucleotide in intron 2 or the 831st nucleotide in intron 2 which is T open to C open. Since the number of measured samples was small, no significant relationship was found between the development of breast cancer and diabetes and the presence of this polymorphism.Conclusion: The results of this research showed that among the available polymorphisms, only the 5'UTR c.331 G>A is related to breast cancer in mastectomies and lumpectomies women.
Clinical Medicine
Mohammad Sadegh Sanie Jahromi; Reza Sahraeai; Shahram Shafa; Mojtaba Ghaedi; Mahbobeh Ranjbar; Hasan Zabetian
Abstract
Introduction: Pain and anxiety after surgery is an unpleasant experience that occurs following various stimuli and humans react to it. This process causes physiological disorders in all body systems. Therefore, the purpose of this study is to compare the effect of oral melatonin and gabapentin ...
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Introduction: Pain and anxiety after surgery is an unpleasant experience that occurs following various stimuli and humans react to it. This process causes physiological disorders in all body systems. Therefore, the purpose of this study is to compare the effect of oral melatonin and gabapentin on pain and anxiety in patients undergoing upper extremity orthopedic surgery under general anesthesia.Methods: In this double-blind randomized clinical trial study, 90 patients with anesthesia class 1 and 2 underwent upper limb orthopedic surgery with general anesthesia. Patients were divided into 3 groups, gabapentin, melatonin, and placebo. VAS scale was used to measure patients' pain. Patients' hemodynamic symptoms were further investigated. Data analysis was done using descriptive and inferential statistical tests at a significance level of P<0.05.Results: 90 patients underwent upper limb orthopedic surgery under general anesthesia. There was no significant difference between the three groups of gabapentin, melatonin, and placebo in the incidence of pain at different times (P<0.05). Trends in mean diastolic blood pressure was not significant (P=0.612). Trends in the average heart rate from the time before entering the operating room to recovery and its exit was not significant (P<0.05).Conclusion: The results of the present study showed that both gabapentin and melatonin drugs have no effect on postoperative pain in patients undergoing upper limb orthopedic surgery, and it may be better to use other drugs or in combination with other sedative drugs.
Psycology
Abdolreza Mehdinavaz Aghdam; Fariborz Rousta
Abstract
Introduction: Due to the limited studies in the field of shivering after anesthesia in thyroidectomy surgeries, on the one hand, and different factors involved in the development of shivering in studies performed, on the other hand, and more sensitivity after thyroidectomy surgery to the hypothermia ...
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Introduction: Due to the limited studies in the field of shivering after anesthesia in thyroidectomy surgeries, on the one hand, and different factors involved in the development of shivering in studies performed, on the other hand, and more sensitivity after thyroidectomy surgery to the hypothermia complications, the evaluation of the prevalence of postoperative shivering in children and determining the factors involved in its development was designed to use the results of the study to improve the anesthesia quality after thyroidectomy.Materials and Methods: This study was performed between 2019 and 2020 with the participation of 100 patients candidates for thyroidectomy in the hospitals of Tabriz University of Medical Sciences. The prevalence of postoperative shivering in these patients was measured using an instrument for determining shivering after anesthesia and the results were reported.Results: Prevalence of shivering in this study was 5% (6 patients). There was no significant difference between the two age groups and sex in terms of the prevalence of shivering. The prevalence of shivering was significantly lower in the intravenous anesthesia group (p<0.05). Also, in patients who received premedication anesthesia, the prevalence of shivering was significantly lower than patients who did not receive premedication (p<0.05).Conclusion: The results of this study showed that the overall prevalence of shivering after thyroidectomy is the same as other surgeries. In addition, the prevalence of shivering after thyroidectomy is related to the patient's body temperature, recovery room temperature, receiving premedication, and type of anesthesia.
Basic Medicine
Parmiss Adyani Kalvanagh; Yousef Adyani Kalvanagh
Abstract
Introduction: This research investigates the relationship between A/T251 polymorphism of IL-8 gene (as a genetic marker) with cancer recurrence after lumpectomy and instead of PCR-RFLP method which most common and expensive method for detecting polymorphisms is the more economical technique of PCR Tetra ...
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Introduction: This research investigates the relationship between A/T251 polymorphism of IL-8 gene (as a genetic marker) with cancer recurrence after lumpectomy and instead of PCR-RFLP method which most common and expensive method for detecting polymorphisms is the more economical technique of PCR Tetra Arms.Methodology: After DNA extraction, a nano drop device was used to evaluate the quantity and quality of DNA and to know its concentration and degree of purity. 1 microliter of the extracted DNA was placed in the device and its optical absorption was read at different wavelengths. For the correct performance of the method and in order to determine the sequence and confirm the PCR product, several samples of dominant homozygotes, recessive homozygotes and heterozygotes were selected and purified by Cena clone kit.Results: Heterozygous individuals were identified with bp169 and bp228 long fragments along with bp439 control band. If mutant homozygous individuals with A allele showed bp 228 fragment and wild homozygous individuals with T allele showed bp 169 fragment on 2% electrophoresis gel.Conclusion: Several cytokines, including IL-8, play an important role in causing laminogenic inflammation in tissue and as a result, causing and aggravating cancers. These studies have studied the role of IL-8 gene polymorphisms and its relationship with types of cancer in different populations. Therefore, this study was conducted with the aim of investigating the 251 A/T polymorphism of the IL-8 gene in the population of Iranian women with breast cancer and the results of this study showed.
Agriculture Science
Dheyaa Hmazah Yasir; Nihad Abdul-Lateef Ali
Abstract
TThis experiment was conducted at the poultry farm of the college of Agriculture, Al-Qasim Green University for the period from 18/9/2019 to 23/10/2019. The study was aimed to the effect of adding different levels of lemongrass leaves (Cymbopogon citratus) to the diet and its extract to drinking water ...
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TThis experiment was conducted at the poultry farm of the college of Agriculture, Al-Qasim Green University for the period from 18/9/2019 to 23/10/2019. The study was aimed to the effect of adding different levels of lemongrass leaves (Cymbopogon citratus) to the diet and its extract to drinking water on Productive performance for broiler chickens (Ross 308). In the experiment, 225 unsexed broiler chicks (Ross), which obtained from Al-Anwar hatchery, it the were randomly distributed on 15 pen, with 5 experimental treatments,45 birds for each treatment. Each treatment included three replicates per 15 birds. The treatments of the experiment were as follows: First treatment: control group free from any addition . The second treatment: a basic feed added to 10 g of lemon grass / kg feed, the third treatment: a basic feed added with 20 g of lemon grass / kg feed, The fourth treatment: adding 100 ml of the aqueous extract of the lemongrass / liter of drinking water, and the fifth treatment: adding 200 ml of the aqueous extract of the lemongrass liter of drinking water. The experiment included studying the following characteristics: average body weight, weight gain, feed consumption, Feed conversion ratio, production index and average water consumption.Significant moral superiority (p≤0.05) for the fourth and fifth treatment (addition of 100 and 200 ml of aqueous extract of lemon grass / liter of drinking water) in the body weight of the body in the fifth week
Clinical Medicine
Maryam Milani Fard; Amir Mohammad Milani Fard
Abstract
In this study, a controlled drug delivery system was modeled to release the drug dissolved in a polymer matrix by polymer degradation. This system is in the form of a page. The drug is released into the environment by the mechanism of penetration and degradation of the polymer. What comes to mind when ...
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In this study, a controlled drug delivery system was modeled to release the drug dissolved in a polymer matrix by polymer degradation. This system is in the form of a page. The drug is released into the environment by the mechanism of penetration and degradation of the polymer. What comes to mind when you first hear the name of the drug may be nothing more than pills, capsules or ampoules! While the world of medicine and the methods of its delivery to the body are not limited to these. Drugs usually enter the body in both digestive and non-digestive ways. The introduction of drugs from these methods has problems and limitations, and for this reason, researchers were looking for ways that could solve the above problems to a large extent. Following these efforts, controlled drug delivery systems were introduced, which have many benefits. The most important of these advantages include the ability to maintain the drug concentration at a relatively constant level for a certain period of time, the ability to adjust the drug release rate depending on the drug delivery site, the ability to deliver the drug to a specific organ or tissue, the ability to deliver multiple drugs with one formulation. These systems have revolutionized the treatment of many diseases and are evolving.
Engineering
Mojtaba Sedghi Amiri; Ebadollah Amouzad Mahdiraji
Abstract
One of the most commonly used equipment in the power system, which is exposed to various types of faults for various reasons, is high and low voltage pressure cables. Due to the fact that cables, either power or distribution cables are mostly transported from underground, despite their further reliability ...
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One of the most commonly used equipment in the power system, which is exposed to various types of faults for various reasons, is high and low voltage pressure cables. Due to the fact that cables, either power or distribution cables are mostly transported from underground, despite their further reliability in airway, they are more difficult to repair and possibly replace in case of fault, in line with this the correct fault detection and location of them is of utmost important. In this paper, as is clear from the title of the research, the Fourier transform and Modal transform methods are used to find the type and location of faults, so that the efficiency of the selected method for detecting and locating the faults in underground transmission cables is examined and the speed and accuracy of finding a solution to the problem is assessed. In this paper, it is expected that the Fourier transform method, followed by the Modal transform has substantial speed and accuracy in determining the type and location of the faults. Meanwhile, the detection and location indicators are used to determine the type and location of the fault, which as shown in the simulations, will have efficient performance. The sample model is simulated to demonstrate the correctness of these methods. The simulation results from MATLAB and EMTP/ATP software confirm the precise and rapid performance of the proposed method.
Clinical Medicine
Maryam Milani Fard; Amir Mohammad Milani Fard
Abstract
Due to the diversity of polymers as well as their complex behavior, research in this field is still widely developed. Because biodegradable polymers become decomposed in the human body after decomposition, they are more commonly used because surgery is not required to remove these polymers from the body ...
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Due to the diversity of polymers as well as their complex behavior, research in this field is still widely developed. Because biodegradable polymers become decomposed in the human body after decomposition, they are more commonly used because surgery is not required to remove these polymers from the body after the drug is released. Understanding the mechanism, modeling and studies of drug release from homopolymers, copolymers and mixtures of this family of polyesters is the focus of this research. In this research, the release of drug from homo and biodegradable copolymer in pure form with drug and finally the mixture of the two with drug has been investigated to determine the differences. In the proposed model, the equations that represent the degradation of the polymer are used to be able to predict the degradation of the polymer. The drug used is paclitaxel, which is a very important drug for chemotherapy. Since this drug is administered every 3 weeks for 3 hours, it is necessary to use controlled systems. Therefore, the purpose of this study is to achieve a predictable model for controlled release of paclitaxel, so that this model responds to the release of paclitaxel at any time.
Physics
Sergey Brindred; Minoo Akhtarian Zand
Abstract
Based on the simulation results, steady-state tracking faults are improved. Control of indeterminate systems, despite the actuator and sensor bias, has been and remains a major challenge. Sensor fault can cause process fault. Among the cases where sensor bias is common, air velocity measurements and ...
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Based on the simulation results, steady-state tracking faults are improved. Control of indeterminate systems, despite the actuator and sensor bias, has been and remains a major challenge. Sensor fault can cause process fault. Among the cases where sensor bias is common, air velocity measurements and gyroscope rates can be mentioned. Although considerable research efforts have previously focused on adapting the fault, the bias correction of the sensor appears to be relatively limited. However, the cause of several crashes was the sensor fault (due to radio altimeter fault, angle of attack sensor fault, airspeed speed sensor fault). Also, finding a way to fix the sensor bias problem is of the utmost importance. The direct model reference adaptive control (MRAC) method is used to control uncertain systems using controllers that are adapted to achieve a performance close to a reference model. However, these controllers maintain system stability and provide close tracking of the reference model response. In this paper, we intend to address the problem of unknown fault bias matching by adjusting the direct reference model adaptive control for state-feedback for state-tracking (SFST). Also, to obtain an asymptotic stable bias fault estimator, we use the Kalman filter to estimate the bias sensor fault. Based on the simulation results, steady-state tracking faults are improved.
Engineering
Amin Ahmadpour; Alireza Bozorgian
Abstract
In this work, coal residue (pitch) was used to produce an inexpensive protective coating. The residue is primarily rehabitated for just to be suitable for use as a coating material (reference coat) by dissolving it in benzene in a ratio of Pitch/Solvent (P/S) = 3:1 by weight. The reference coating was ...
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In this work, coal residue (pitch) was used to produce an inexpensive protective coating. The residue is primarily rehabitated for just to be suitable for use as a coating material (reference coat) by dissolving it in benzene in a ratio of Pitch/Solvent (P/S) = 3:1 by weight. The reference coating was then mixed with polyurethane (commercial type) in percentages ranging from 5 to 15 % by weight of the solid tar pitch. Well mature mortar cubes (7x7x7cm) with a (w/c =0.4) and sand-cement (s/c= 2.75) were cast and covered with the prepared coatings. The cubes were then soaked individually in tap water, MgCl2-5% conc. and H2SO4- 3.0% conc. for different periods of time. The last two reagents represent sea water and 5 years complete immersion in sewage water respectively. The effect of reagents on the compressive strength, water retention and weight was measured for the cubes. The results revealed that, all prepared coatings gave satisfied physical characteristics. Addition of PUR up to 10% by weight of coal residue produced coating materials with the most favorable physical and chemical behavior.
Chemistry
Nabil Vaeli
Abstract
In this study, Carvacrol or Cymophenol as a combination, as the number of reports of antibiotic-resistant pathogenic microorganisms increases and considering that plant-derived products can potentially treat microbial growth in different conditions and in specific cases of the disease. Very strong anti-cancer ...
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In this study, Carvacrol or Cymophenol as a combination, as the number of reports of antibiotic-resistant pathogenic microorganisms increases and considering that plant-derived products can potentially treat microbial growth in different conditions and in specific cases of the disease. Very strong anti-cancer and also an antibacterial treatment of yeast infections from Oliveria decumbens plant by supercritical fluid CO2 with the help of ultrasound at 150,180,210 bar and temperatures of 55, 45 and 65 ° C. The compounds were examined by GC / MS device. The method is about 37% more than the distillation method with Clevenger apparatus. Also, to increase the extraction rate, C65 temperature, 180 bar pressure and 37 kHz frequency were determined as optimal conditions, in which about 26% compared to the case without ultrasound without extraction.
Engineering
Ebadollah Amouzad Mahdiraji
Abstract
In general, the stability of the power system can be considered a feature of the system that enables it to remain in equilibrium under normal conditions and regain a different acceptable state if affected by disturbance. Instability in a power system may take many forms, depending on the composition ...
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In general, the stability of the power system can be considered a feature of the system that enables it to remain in equilibrium under normal conditions and regain a different acceptable state if affected by disturbance. Instability in a power system may take many forms, depending on the composition of the system and its operating modes. In order to evaluate the proposed method in damping transient fluctuations and network stability, a study has been carried out on a typical network. Since the topic of the article is in the field of transient stability, in part of the paper, braking resistance modeling in transient stability studies has been investigated. In the section on brake resistor control, brake resistor control is introduced by a switched Thyristor, using the trapezoidal method. Finally, the simulation results of the studied network are presented with the presence of TCBR and its capability of damping in the desired network.
Engineering
Negin Shiri; Kamal Malmal
Abstract
In this paper, a time-based model for distribution network development planning is proposed, considering the possibility of using distributed electricity generation technologies and the existence of capacitor banks. The proposed model specifies the location, capacity, and timing of the use of distributed ...
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In this paper, a time-based model for distribution network development planning is proposed, considering the possibility of using distributed electricity generation technologies and the existence of capacitor banks. The proposed model specifies the location, capacity, and timing of the use of distributed generation technologies and capacitor banks as well as the schedule for increasing the capacity of the grid lines. The Genetic Enhanced Algorithm is used to solve the stated problem to optimize the network development plan including the time, location and capacity of DG and capacitor banks in the distribution network as well as to optimize the investment cost and operating cost. It was also implemented in a MATLAB programming environment to validate and evaluate the effectiveness of the proposed solution to the problem of distribution network development planning on a 17-bus radial distribution network.
Engineering
Mohammad Ranjbarian
Abstract
The model of excellence of the organization is the most extensive tool of self-evaluation in the world and is the basis for designing national awards in various countries, including Iran. Numerous studies have shown that the use of management evaluation models such as excellence model has a positive ...
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The model of excellence of the organization is the most extensive tool of self-evaluation in the world and is the basis for designing national awards in various countries, including Iran. Numerous studies have shown that the use of management evaluation models such as excellence model has a positive effect on the performance of organizations. Since organizations must continuously evaluate their performance and formulate their future strategies based on these evaluations, among the many models designed to evaluate performance in this study, the indicators of the organizational excellence evaluation model Used to measure and evaluate the performance of the organization. The EFQM model was introduced in 1991 as a business excellence model that provided a framework for organizational judgment and self-evaluation and ultimately European quality reward, which was implemented in 1992. This model demonstrates the sustainability benefits that a superior organization must achieve. This model quickly attracted the attention of European companies and it was found that public sector organizations and small industries are also interested in using it. Found worldwide.
Engineering
Andi Brous
Abstract
Distribution of distributed generation resources in distribution systems has several advantages, including reducing losses, improving voltage profiles, reducing pollution, and increasing system reliability. However, one of the most important points regarding the placement of these resources in distribution ...
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Distribution of distributed generation resources in distribution systems has several advantages, including reducing losses, improving voltage profiles, reducing pollution, and increasing system reliability. However, one of the most important points regarding the placement of these resources in distribution networks is economic issues and the return on investment and the increase in profits from the placement of these resources. On the other hand, due to the privatization of power systems, other distribution networks will not necessarily own the distributed generation resources. Therefore, despite choosing the location of scattered production resources by the owners of scattered production resources and pricing their production power, the selection of purchasing power from each of the scattered production units or the national electricity system is done by the distribution network operator. It will be for supply. Thus, owners of scattered production resources must choose the location and price of the production capacity of their resources in such a way that their profit is maximized and at the same time the amount of payment paid by the network operator is minimized. Therefore, in this paper, the issue of location and optimal pricing of distributed products is considered to increase the profit of the owner of scattered production resources provided that the distribution company pays the minimum payment cost and the method used to solve this problem is the ant-optimization algorithm. It is inspired by the ant's milk hunting mechanism and is a powerful optimization algorithm.
Engineering
Seyed Aliakbar Saadpour
Abstract
The genus Saprolegnia is one of the most important pathogenic aquatic fungi in farmed and wild fish. In this paper, 100 samples were prepared from 10 fish ponds in Sari, Neka and Behshahr. After cultivation, purification and macroscopic and microscopic examinations, we were able to isolate the fungi ...
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The genus Saprolegnia is one of the most important pathogenic aquatic fungi in farmed and wild fish. In this paper, 100 samples were prepared from 10 fish ponds in Sari, Neka and Behshahr. After cultivation, purification and macroscopic and microscopic examinations, we were able to isolate the fungi Saprolegnia parasitka, Saprolegnia and Aclia. Their prevalence was 48% Parasitica, 38% Saprolegnia, 36% Aclias and 15% other fungi, respectively. Their frequencies are 48 Parasitica, 38 Saprolegnia, 36 Aclias and 15 other fungi, respectively. Also, in the study of other parameters and their effect on the presence of Saprolegnia, it was observed that the ambient temperature of the water was suitable for the growth of this fungus and also the pH and salinity of the water also affected the presence of Saprolegnia.
Engineering
Reza Kolbadinezhad; Ebadollah Amouzad Mahdiraji
Abstract
Exposure to dust in the air is one of the most common environmental hazards in workshops that can have devastating effects on health. In this study, workers' exposure to particles in inhaled air by conventional methods as well as GIS has been investigated. The research was performed cross-sectionally-analytically ...
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Exposure to dust in the air is one of the most common environmental hazards in workshops that can have devastating effects on health. In this study, workers' exposure to particles in inhaled air by conventional methods as well as GIS has been investigated. The research was performed cross-sectionally-analytically and the sample size was determined through homogeneous exposure groups and environmental and individual exposure was performed based on standard methods and individual and environmental sampling methods. The obtained data were analyzed using GIS software to determine the distribution maps. In this paper, the mean concentration of exposure to dust for each individual in the matched exposure groups was 8.361 mg/m. The highest level of individual exposure was estimated in the powder operator with a value of 21313 mg/m3 and the lowest in the fine wire emperor with a value of 1.97 mg/m3. The minimum environmental concentration in the cutting hall was 0.305 mg/m and the maximum value was 22 mg/m3 in the powder hall. The results of the evaluation with AIHA criteria in all methods showed that weaving, material, and packaging halls have the highest concentration and cutting halls have the lowest dust concentration. Comparison with the GIS method showed that powdering, materializing, and packing halls have the highest concentration and cutting halls have the lowest dust concentration. Comparison with the GIS method showed that in this method, more people are classified in the risk area.
Mohammad Ranjbarian
Abstract
Continuous improvement of organizational performance creates a huge synergistic force that can support the growth and development program and create opportunities for evaluating organizational excellence. Governments, organizations and institutions are making progressive efforts in this regard. Without ...
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Continuous improvement of organizational performance creates a huge synergistic force that can support the growth and development program and create opportunities for evaluating organizational excellence. Governments, organizations and institutions are making progressive efforts in this regard. Without reviewing and gaining knowledge of the progress and achievement of goals and without identifying the challenges facing the organization and obtaining feedback and information on the implementation of policies and identifying issues that need serious improvement, continuous performance improvement will not be possible. All of the above is not possible without measurement and evaluation. The European Quality Award has left a mark on the competitiveness of European companies and organizations, and the widespread use of these models in other countries is undoubtedly the reason for the amazing effectiveness and impact of these models. In this article, the definitions and theoretical foundations of performance evaluation of excellence have been studied in a completely scientific way.
Clinical Medicine
Andi Brous
Abstract
One of the most important goals in the color photography process is to reconstruct and translate colors faithfully and correctly, and if the photographer wants the colors to have unnatural effects in the image, this unfaithful translation must be predictable and completely under the control and desire ...
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One of the most important goals in the color photography process is to reconstruct and translate colors faithfully and correctly, and if the photographer wants the colors to have unnatural effects in the image, this unfaithful translation must be predictable and completely under the control and desire of the photographer. Special color photography filters are filters that serve these purposes. As mentioned, the process of translating and reconstructing colors depends on the topic of "color temperature".It is emphasized again that the correct translation of colors in a color image is achieved when the color temperature of the light used is completely consistent with the color quality of the emulsion used. Different types of special color photography filters are actually color temperature filters that change the sum of the three colors of blue, red and green in the light or each of these three colors by different images.
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