Showing 17 results for Allahverdi
Volume 1, Issue 1 (3-2013)
Abstract
Aims: Adolescence is one the most precarious periods of life, concerning the drug abuse. The social cost of the drug abuse and injury among adolescents is extraordinary and requires intervention. The theory of planned behavior (TPB) is perhaps the most influential theory for prediction of social and health behaviors including drug abuse. This study aimed at designing and implementing a curriculum based on the TPB for preventing adolescents from drug abuse. Methods and Materials: This quasi-experimental study was conducted in Hamadan, west Iran. We recruited 140 male high school students from randomly selected schools: they were divided into experimental group, n = 70 and control group, n = 70. The experimental group received 20 hours educational program based on the TPB. The control group receives no intervention. Findings: Compared to the control group, experimental group have significantly elevated post test scores for attitude (19.07 vs. 15.28, p < .001), subjective norm (18.08 vs. 16.45, p < .001), perceived behavioral control (51.67 vs. 54.82, p < .001); and their intention to use drug significantly decreased(p = 0.082) Conclusions: The TPB-based educational program may be effective in prevention of substance abuse among adolescents.
Volume 1, Issue 1 (9-2015)
Abstract
The list of forty one subgenera of the genus Andrena from Iran is given. The list provided here is based on a detailed study of all available published data. Four subgenera and five species are recorded for the first time from Iran, including Andrena (Cnemidandrena) fuscipes (Kirby, 1802), Andrena (Lepidandrena) curvungula (Thomson, 1870), Andrena (Lepidandrena) pandellei (Pérez, 1895), Andrena (Parandrena) sericata (Imhoff, 1868) and Andrena (Platygalandrena) tecta (Radoszkowski, 1876). Ecological notes on the newly recorded species are briefly discussed.
Volume 1, Issue 2 (12-2015)
Abstract
The genus Euxoa Hübner, [1821] is regarded as the most highly evolved among the genera of the subfamily Noctuinae and contains by far the largest number of species of the subfamily in Europe and in the Palaearctic region. Fifty-four species of this genus has been already reported from Iran. In this paper a list of 17 already recorded species and subspecies of Euxoa from the north-east of Iran is given and discussed. Furthermore, E. acuminifera (Eversmann, 1854) is newly reported for the fauna of Iran. Figures of its adult male and female and their genitalia are provided together with bionomics and distribution of the species.
Volume 2, Issue 1 (Winter 2019)
Abstract
Aims: The purpose of this study is explanation of the relationship between maritime location of countries and their economic and social development Index. This research is basic in terms of goal and is descriptive - analytic and correlational in terms of the nature and method.
Methodology: The data obtained is based on the secondary data from specialized agencies. The research is firstly intended to index and rank the access to seas and economic and social development of maritime states using the TOPSIS technique. According to the TOPSIS technique findings, the relationship between sea access index and the index of level of economic and social development. Using SPSS software. The regression analysis is adopted to explain the relationship between the index of sea location and economic and social development attributes.
Conclusion: The research findings indicate that offshore states with different levels of size, shape, population, etc., are predominantly included in rankings of this study. The level of economic and social development of the states is affected by sea location of the states. The results regarding to the explanation of the relationships between sea access and the index of the level of economic and social development show that there is a meaningful relation between the two indexes in which the sea access is one of the factors adversely affecting the level of economic and social development of states.
Volume 2, Issue 2 (Spring 2020)
Abstract
The present study investigates relation between coastal zons with urban human structures in sea states. Urban human structures are urban populations, coastal cities, world cities and coastal capitals. This research is basic in terms of its objective and is descriptive-analytic in terms of nature and method. This paper uses qualitative and quantitative analysis to explain the relationship between the two variables of coastal zons and urban human structures. The ratio of low elevation coastal zone (less than 10 meters from the coast) to the total surface area of the country is an explanatory indicator of coastal topography, and the ratio of the population living in the coastal zone to the total population of the country is an explanatory indicator of the coastal population. The findings of the research indicate that the coastal area is one of the factors in the development of urban human resources. Regression analysis shows that the correlation coefficient of coastal zone topography with the distribution of population equals with 0.812 (P Value 0.000<0.05). The results show that there is a significant relationship between topography of the coastal zone and the distribution of population, to the extent that for every one-unit increase in topography of the coastal region, the distribution of human populations index size increases by 0.833 (constant 0.070). Besides, the opportunities and threats of population settlement in coastal zone are analyzed in the following section of the article.
Volume 5, Issue 4 (5-2016)
Abstract
If the organizational excellence models employ correctly, they would be effective tools for institutionalizing organizational concepts & values, employing self-assessment methods, organizational learning and continuous improvement in the organizations. And also it will provide recognition of the best processes. Islamic Republic of Iran Police tries to design and operationalize its excellence models, but the proportionate excellence patterns that can be applicable for Islamic Republic of Iran Police, hasn’t designed and executed yet. So the subject of this research is to design an organizational excellence model in Islamic Republic of Iran Police. To develop this model weights of criteria has obtained using analytical hierarchy process (AHP) and relationships between criteria has determined using DEMATEL method. results show that leadership criteria has the highest score between enablers and the most effectiveness on others. Additionally, client results have the highest score between results and is the main receiver between other criteria. Finally a hierarchy method to prioritize improvement projects has suggested.
Volume 8, Issue 1 (3-2022)
Abstract
View on Scopus
A checklist of the bees of the genus
Hylaeus Fabricius, 1793 of Iran, based on the literature data and also field surveys in northeastern Iran (North Khorasan and Khorasan-e Razavi provinces) is presented. The resulting checklist comprises nine subgenera and 63 species. Four species of the genus
Hylaeus, including
H. (
Lambdopsis)
rinki (Gorski, 1852),
H. (
Spatulariella)
hyalinatus Smith, 1842,
H. (
Spatulariella)
punctatus (Brullé, 1832) and
H. (
Prosopis)
lionotus (Alfken, 1909), are newly recorded for the fauna of Iran. The later species is considered as ″ very rare″ , has only known in Kazakhstan. A re-description of the male of
H. (
Prosopis)
lionotus together with the illustrations of morphological characters is given.
Volume 10, Issue 1 (Winter 2024)
Abstract
Background: Haemophilus influenzae and Moraxella catarrhalis are common pathogens in respiratory tract infections, causing some diseases like community-acquired pneumonia, acute sinusitis, and otitis media. Antimicrobial resistance in these pathogens occurs over the years. This systematic review aimed to investigate the antibiotic resistance pattern of these pathogens in Iran in the last 5 years.
Materials & Methods: All original articles related to the antimicrobial resistance of H. influenza and M. catarrhalis in Iran since 2018 were searched in English and Persian databases. The articles were screened primarily and secondary. After screening the articles (extracted blindly), conflicts were resolved, and the final data were reviewed.
Findings: This study included nine articles after primary and secondary screening steps, comprising 111 H. influenzae and 78 M. catarrhalis isolates. The lowest resistance of H. influenzae isolates was against levofloxacin (0.0%), cefotaxim (11.1%), and ceftriaxone (11.1%), while the highest resistance of these isolates was against tetracycline, co-trimoxazole, and ampicillin. M. catarrhalis isolates showed the highest resistance to penicillin (100%), cefazolin (87.5%), cefuroxime (84.4%), ampicillin (84.4%), and amoxicillin (81.2%). Co-trimoxazole resistance rates of M. catarrhalis isolates from adenoid tissue and pharynx were different. Resistance to fluoroquinolones was 0.0%; macrolides were the most effective antibiotics.
Conclusion: Fluoroquinolones and macrolides are the most effective antibiotics for M. catarrhalis, while fluoroquinolones and cefotaxime or ceftriaxone work best for H. influenzae. It is recommended to use fluoroquinolones and macrolides for managing outpatients and fluoroquinolones, macrolides, or ceftriaxone for managing inpatients. Prescription of β-lactams and/or co-trimoxazole is ineffective.
H. Hashemzadeh, A. Allahverdi , P. Ertl, H. Naderi-Manesh,
Volume 10, Issue 4 (Fall 2019)
Abstract
In view of the constant increase of nanotechnology and nanomaterials applications in our daily life, to determine whether they are safe, “in vitro” and “in vivo” screening methods are needed. Obviously, application of models that are similar to the physiological tissues process of the human body could be a better candidate. The three-dimensional spheroid method, spheroid were generated using commercial microplates, has many benefits (in comparison with traditional methods or monolayer cell culture) such as the growth of the cells in 3D, similar to the body's physiological tissue, an alternative for animal models, cell-to-cell interactions, and better cell signaling. In this study, the toxicity of silver nanoparticles by using three factors such as metabolic activity, live/dead assay, and spheroid surface area was evaluated using two different methods (2D vs 3D) under treatment with various concentrations of silver nanoparticles at different times. The results showed that different cells types, cancer and/or normal lung cells, have significant differences. In addition, it was observed that distinct differences in terms of cytotoxicity of silver nanoparticles between 2D and 3D culture systems and also the rate of growth/non-growth of spheroids are highly depended on cell type and various concentrations have fundamental importance in such studies. The present study provides evidence that cellular dimensions (3D vs 2D) play a pivotal role in the results and outcomes of inflammation and cytotoxicity with nanoparticles due to the spatial-temporal structure.
Volume 10, Issue 4 (Fall 2022)
Abstract
Aims: Nowadays, the depletion of renewable resources and production particulate matter brought on by desertification and the subsequent dust storms pose a serious and immediate threat to human health. The purpose of this study is to investigate the stabilization methods applicable for desert dust as well as sandy soils to prevent desertification and dust-related negative consequences.
Materials & Methods: The methodology used in this research is a complete review of the provided sources and evaluation of their results in the last two decades in this field. This review deeply investigates the methods and Materials of stabilization of desert sandy soil.
Findings: Chemical stabilizers of loose sand, including cement, lime, nanoclay, blast furnace slag, polymer, fly ash, and other stabilizers, have been used in different countries of the world and have shown acceptable results. The results of the studies show that by using these methods and stabilizing materials, wind erosion can be reduced by 70% and the compressive strength of the soil can be increased by up to 2 times its initial value.
Conclusion: We draw the conclusion that we will require a green and reasonably priced stabilizer to stabilize the desert dust based on the study we have done and the analysis of the papers that have been presented in this sector. Given the limitations and drawbacks of the aforementioned stabilizers, a good stabilizer doesn't destroy the soil's vegetation, doesn't significantly alter the soil's color, texture, or chemical composition, and doesn't interfere with the roots' ability to breathe.
Hossein Soleymani, Mohammad Ghorbani, Abdollah Allahverdi, Hossein Naderi-Manesh,
Volume 13, Issue 4 (1-2023)
Abstract
Stem cells are characterized by their capacity for self-renewal and their ability to differentiate into specific cell types under the influence of their microenvironment. It is known that matrix chemistry controls stem cell differentiation. Single cell encapsulations of the Mesenchymal stem cells into a semi-permeable microgel, allows a greater control of the stem cell fate. In this study, a chip for single-cell encapsulation was designed and fabricated using microfluidic technology. By using microfluidic chip, human bone marrow mesenchymal stem cells (hBMSCs) are encapsulated inside alginate and alginate-poly-l lysine (PLL) microgels. The results of long-term viability of MSCs inside alginate-PLL microgels, shows a significant increase compared to alginate microgels. Mesenchymal stem cell proliferation in alginate-PLL microgels also increased significantly on days 14 and 21. It seems that PLL improves cell adhesion and function by creating a positively charged matrix. Microscopic studies indicate that the morphology of the cells inside the microgels is spherical. However, the average diameter and volume of cells in microgels containing PLL are smaller than others, which indicates more proliferation and space limitation inside the microgels. Therefore, single cell alginate-PLL microgels provide a suitable substrate in clinical studies for tissue engineering, organ transplantation and cell therapy.
Mohsen Hosseinzadeh, Abdollah Allahverdi,
Volume 14, Issue 4 (9-2023)
Abstract
Investigation of the biomechanical properties of cancer cells is essential for progress in treatment and a better understanding of cancer’s invasion mechanisms. Most of the research carried out in recent years has been done on two-dimensional cultured cells, while the study of cultured cells in three-dimensional mode is more difficult due to the growth of cells in all dimensions and the presence of cell-cell and cell-extracellular matrix connections. It is preferable to a two-dimensional culture. Three-dimensional cell culture, compared to two-dimensional culture, is physiologically closer to in-vivo environmental conditions, but it is currently not considered a common approach for cell culture and preclinical experiments. The lack of a suitable substrate and the limitations of common techniques in characterizing various parameters of cells in three-dimensional mode are considered limitations of this type of culture.
In this research, initially, the substrate was made using PDMS to generate a platform for spheroids, and then the formed spheroids were exposed to Taxol as an anti-cytoskeletal drug. Consequently, by imaging them for a certain period of time, their survival rate was checked, and finally, in order to obtain mechanical parameters, the spheroids’ outer surface was scanned by an atomic force microscope.
The results show that the drug Taxol could reduce the survival rate of tumors, and also affect the biomechanical characteristics of cells in a three-dimensional state. In this case, Young's modulus has decreased from an average of 4.84 kPa to 3.67 kPa under the treatment with Taxol.
Simasadat Lajevardi, َabdollah Allahverdi, Seyedehsamane Shojaeilangari,
Volume 15, Issue 2 (5-2024)
Abstract
Cancer is one of the leading causes of death worldwide. Breast cancer is the most common cancer among women and causes a high number of annual deaths. The most reliable method for successful cancer management is accurate and early diagnosis. On the other hand, the lack of timely diagnosis leads to the spread of cancer in the body, making it difficult to treat and control. The gold standard method for breast cancer diagnosis is biopsy. Usually, visual inspection and manual assesement are used to diagnose cancer, where the pathologist examines the histopathology slides under a microscope which is error-prone and time- consuming procedure and requires years of expertise. Therefore, computer-aided diagnosis is essential to help physicians improve the efficiency of interpreting medical images. In this study, we use deep learning models, especially convolutional neural networks (CNNs) to detect whether or not histopathological images are cancerous. The AUC, Precision and F1-score obtained using the pre-trained Incetion-V3 deep neural network are 98.36%, 95.28% and,97.25% respectively, and the same parameters for the pre-trained ResNet-18 deep neural network are equal to 97.90 %, 97.46% and 98.22%. The presented models are able to provide reliable diagnosis results for different morphologies of breast tissues.
Volume 17, Issue 6 (8-2017)
Abstract
This paper presents a new method based on machine vision for mobile robots to detect and avoid obstacles in unknown environments. One of the challenges of mobile robots trajectory control in unknown environments is that their obstacle avoidance system to be designed robust to material and shape of the obstacle. In this research a mobile robot equipped with a camera is designed and fabricated. Also an algorithm is proposed and implemented on the robot in order to detect obstacles by image processing and to control the robot trajectory. Three color laser pointers are mounted on the robot with certain angles that emit beams to the ground at ahead of the robot. The received images from camera contain these colored points that their coordinates are determined by image processing. Then position of any possible obstacle is detected using the proposed algorithm and the robot is commanded to avoid obstacles by changing its path. These obstacles can be static or dynamic. Our experimental results show that the proposed method, with a high reliability, has the ability to detect and avoid obstacles with any shape and material whereas other similar methods had restrictions in this regard.
Volume 18, Issue 1 (3-2018)
Abstract
In this paper, a new Multiple Model Adaptive Control (MMAC) is proposed to control of the satellite antenna position with time varying input delay. Selecting of adequate delay estimation method and weighting algorithm using delay estimation error are features of proposed controller. Input delay can be effect on the performance of the closed loop system and if delay time is unknown and time varying, the closed loop system will probably be unstable. At these cases, delay time must be identified to adopt control signal. It is assumed that upper bound of the delay time is known. Delay time is divided into several small bounds and then an adequate PI controller is designed for each bound to guarantee closed loop system performance and stability. In the on-line mode, delay time is identified by adequate estimation algorithm and the control signal is constructed by a weighted sum of the designed controllers output. Control signals weights are a function of the absolute error between the estimated and the average delay time in each bound. Performance of the proposed method and stability of closed-loop system is assessed using several simulations of the system. Simulation results confirm the effectiveness of the proposed algorithm with respect to conventional PI controller.
Volume 20, Issue 2 (February 2020)
Abstract
In this research, nonlinear transverse vibrations of a fluid conveying microtube under parametric magnetic axial resonance condition is studied. For this purpose, nonlinear governing equations of transverse motion of beam-like microtube are derived using Reddy’s first-order shear deformation theory with considering the effect of fluid viscosity and fluid centripetal acceleration. In this model, nonlinear terms of Hetenyi foundation and nonlinear geometric terms of the Von-Karman theory under magnetic excitations in the presence of fluid flow beyond the flutter instability is considered. In the following, the effects of foundation parameters on the linear flutter specifications of fluid conveying magnetizable microtubes are studied. Then, the nonlinear system behavior for fluid flow velocities more than critical velocity corresponding to the coupling of the first and second vibration modes is studied using multiple scales method. Nonlinear response curves in velocities above critical velocity are obtained and effects of variations of various system parameters including flow velocity, amplitude, and frequency of the magnetic field, Hetenyi foundation stiffness constants, viscosity, and dimensions ratio on the nonlinear response of the system are investigated. Some results indicate that increasing the values of shear stiffness parameter of the Hetenyi foundation has an unstable effect so that with its increasing, the flutter instability occurs at lower frequencies.
Volume 23, Issue 9 (September 2023)
Abstract
Heart diseases are one of the most important causes of death in the world, and their treatment is very important from a medical and financial perspective. One of the effective ways that can be very useful in the treatment of cardiovascular diseases is computational modeling which can help medical professionals to better understand the human heart and provide more effective therapeutic approaches. The mechanical characteristics of the myocardium of human heart, known as a nonlinear and anisotropic tissue, are the most important part of the heart because it plays a key role in myocardial response to loading and unloading during heart cycle. In this study, the orthotropic hyperelastic and isotropic viscoelastic properties of the human heart were modeled by taking into account the effect of active stress on myocardium and using an idealized left ventricular geometry. Simulation results showed that the viscoelastic property cause the myocardium deformation to be damped and reduces the amount of torsion that experienced by the tissue. Also, myocardium tissue in viscoelastic case showed the hysteresis phenomenon which is found in clinical observations of heart mechanics. The Model is entirely implemented in COMSOL Multiphysics finite element software and can be used in heart electromechanical models in future studies.
