A microstrip folded compact wideband band‐pass filter with wide upper stopband

Seyyed Mojtaba Seyyed Najjar Hoseini,Reza Zaker,Khalil Monfaredi 한국전자통신연구원 2021 ETRI Journal Vol.43 No.6

A miniaturized wideband band‐pass filter with a 3‐dB fractional bandwidth of 109.3% (1.53 GHz to 5.22 GHz), high out‐of‐band attenuation greater than 25 dB, and wide upper stopband up to 14 GHz is proposed. The design consists of a dual‐composite right/left handed resonator, embedded open‐circuited stub, and a pair of quarter‐wavelength short‐circuited stubs. These elements are coupled in the near distance to form a miniature filter with a compact occupied area of 0.21 λg× 0.19 λg (≈ 0.013 cm2). The optimized filter has multi‐transmission poles in the passband, substantially improving the return loss and insertion loss characteristics. The behavior of the passband and stopband is verified against the results of a lumped element model and matrix analysis with a full‐wave moment‐based analysis and actual measurements. The results of this verification and a comparison with the performance of filters in other references indicate that the proposed filter is very efficient and applicable to compact microwave systems.

Comparison of the Minimum Plateau Width by Plateau and a New Method in People with Conductive Hearing Loss

Seyyed Jalal Sameni,Ahmad Daneshi,Akram Pourbakht,Aliakbar Tahaei,Mohammad Kamali 대한청각학회 2018 Journal of Audiology & Otology Vol.22 No.4

Background and Objectives: In clinical masking, the plateau is a state in which the non-test ear (NTE) is completely masked by the noise and tone is heard only by the test ear (TE). At least 15 to 20 dB of plateau width is needed to obtain valid threshold. In the study, a part of plateau after initial masking level known as the minimum plateau width (mPW) was determined and compared by a new formula and the plateau searching method. Subjects and Methods: Minimum plateau widths of air conduction were obtained in 29 participants with unilateral and 30 participants with bilateral conductive hearing loss (CHL) aged 20 to 45 years old by using step by step plateau method and mPW estimation by the formula between two points of masking diagram [mPW=(N2-N1)-(T2-T1)] and then the mPW of twomethods was compared for each frequency. Results: There was no significant difference between the minimum plateau width obtained by the plateau and formula methods for two given point of masking diagram in people with unilateral and bilateral CHL at octave frequencies from 500 Hz to 4,000 Hz. Conclusions: Threshold obtaining of TE by two tones for two noise levels delivered to the NTE is enough to estimate the mPW between these two noise points and it is not necessary that for clinicians to know the actual values of masking diagram components.

Review of potential spermatogenic and aphrodisiac effects of the Ferula genus

Seyyed Majid Bagheri,Amir Shieh,Jalil Alizadeh Ghalenoei,Maryam Yadegari,Nasrin Alborzi The Korean Society for Reproductive Medicine 2023 Clinical and Experimental Reproductive Medicine Vol.50 No.3

Objective: Men's sexual health plays an important role in male fertility and childbearing, as it is associated with factors such as sexual desire, healthy spermatogenesis, and erectile function. In various cultures, medicinal plants have been utilized to address male sexual issues, including infertility and erectile dysfunction. Despite recent advancements in medical science for treating male impotence, some men opt for herbal supplements as an alternative, given that numerous herbs have the potential to enhance male sexual performance. The Apiaceae family is one of the oldest plant families used for medicinal purposes. Ferula, a genus within this family, comprises approximately 170 different species worldwide. Members of this genus possess numerous therapeutic properties due to the presence of various compounds. This article aims to explore the potential impacts of Ferula plants on the male reproductive system. Methods: This review article was prepared by searching for terms including Ferula and "aphrodisiac," Ferula and "spermatogenesis," and Ferula and "male reproductive system." Relevant information was gathered through electronic databases, including ISI Web of Knowledge, PubMed, and Google Scholar. Results: The findings indicated that relatively comprehensive studies have been conducted in this area, revealing that certain Ferula species have been employed in folk medicine to boost fertility and libido. Recent research has corroborated these effects. Conclusion: It is hoped that new aphrodisiac compounds with fewer side effects can be isolated from Ferula plants in the future.

Applying 3D U-statistic method for modeling the iron mineralization in Baghak mine, central section of Sangan iron mines

Seyyed Saeed Ghannadpour,Ardeshir Hezarkhani,Abbas Golmohammadi 한국자원공학회 2018 Geosystem engineering Vol.21 No.5

The U-statistic method is one of the most important structural methods to separate the anomaly from background. It considers the location of samples and carries out the statistical analysis of the data without judging from a geochemical point of view and tries to separate subpopulations and determine anomalous areas. In the present study, 3D U-statistic method has been applied for the first time through the three-dimensional (3D) modeling of an ore deposit. In order to achieve this purpose, 3D U-statistic is applied on the data (Fe grade) resulted from the drilling network in Baghak mine, central part of the Sangan iron mines (in Khorassan Razavi Province, Iran). Afterward, results from applying 3D U-statistic method are used for 3D modeling of the iron mineralization. Results show that the anomalous values are well separated from background so that the determined samples as anomalous are not dispersed and according to their positioning, denser areas of anomalous samples could be considered as anomaly areas. And also, final results (3D model of iron mineralization) show that output model using this method is compatible with designed model for mining operation. Moreover, seen that U-statistic method in addition for separating anomaly from background, could be very efficient for the 3D modeling of different ore type.

Optimal Path Planning for Two Unmanned Aerial Vehicles in DRSS Localization

Seyyed Ali Asghar Shahidian,Hadi Soltanizadeh 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.6

Optimal path planning for three or more unmanned aerial vehicles (UAVs) in radio source localization has been studied extensively; but path planning for two UAVs in signal strength based localization is still a challenge. This paper investigates the autonomous path planning for a pair of UAVs equipped with received signal strength (RSS) sensors applying optimum experimental design criteria based on the fisher information matrix (FIM). The control strategy steers the UAVs along the paths that minimize the emitter location uncertainty. Since there is one differential received signal strength (DRSS) measurement (two RSS sensors) in each time step, the emitter location uncertainty is infinite for a single measurement and the FIM is singular. The FIM is approximated at successive waypoints using the estimated location of the emitter produced by the extended kalman filter (EKF). The objective of this paper is to propose path planning approaches for minimum number of UAVs in DRSS-based localization based on different optimum criteria including D-, E-, A-optimality and sensitivity. Each criterion is related to a different characteristic of the estimation uncertainty ellipsoid and consequently generates different trajectories. The proposed steering algorithms are evaluated through extensive simulations.

The effect of increasing the illumination on operators’ visual performance in the control-room of a combined cycle power plant

Seyyed Abolfazl Zakerian,Saeid Yazdanirad,Seifollah Gharib,Kamal Azam,Asma Zare 대한직업환경의학회 2018 대한직업환경의학회지 Vol.30 No.-

Background: Lighting is one of the environmental factors affecting the performance of the control room operators. Therefore, the aim of this study was to compare the control room operators’ visual performance in two different illumination conditions at a combined cycle power plant through field-work. Methods: Sixteen operators in day shift were evaluated with the Freiburg Visual Acuity test (FrACT) software at two lighting systems with different intensities. It includes the first phase with fluorescent illumination system (Power: 40 W, Color Temperature: 4000 Kelvin, Luminous Flux: 2780 Lumen and Model: Pars Shahab) and the second phase with a combined illumination system includes fluorescent and LED (Power: 48 W, Color Temperature: 4000 Kelvin, Luminous Flux: 5400 Lumen and Model: Mazinoor). Results: Based on the results, visual performance index and visual acuity significantly increased after the intervention (p < 0.001). As to contrast, more lighting significantly reduced the percentage of recognized contrast (p < 0.001) and increased the contrast performance index (p < 0.001). Conclusions: The results of this study showed that increasing the intensity of light from the values below the allowable limit to the values above the allowable limit would increase the visual indicators in individuals.

Effect of Drought Stress on Root Yield and Some Morpho-Physiological Traits in Different Genotypes of Sugar Beet (Beta Vulgaris L.)

Seyyed Gholam Reza Moosavi,Seyyed Hamid Reza Ramazani,Saeid Sadeghzadeh Hemayati,Hamid Gholizade 한국작물학회 2017 Journal of crop science and biotechnology Vol.20 No.3

To study the effects of different levels of drought stress on root yield and some morpho-physiological traits of sugar beet genotypes, a study was conducted in the research farm of Islamic Azad University of Birjand, Iran in 2013 as strip-split plot experiments based on randomized complete block design. Different levels of drought stress were considered as vertical factor in three levels including normal irrigation, moderate stress, and severe stress. Horizontal factor was assigned to five varieties of sugar beet. Drought stress had a significant effect on root dry weight, total dry weight, root yield, and leaf temperature at 1% probability level and on leaf dry weight, crown dry weight, and harvest index at 5% probability level. Drought stress had an adverse effect on root yield of investigated genotypes of sugar beet. Under normal conditions, the mean of root yield was higher than middle and severe drought stress. Different investigated genotypes of sugar beet responded to drought stress based on their yield potential. The highest positive correlation of root yield was observed with root dry weight (r=0.977**). Stepwise regression analysis and path coefficient analysis showed that root dry weight and petiole dry weight are the most important traits that can affect root yield of sugar beet under drought stress and can used as selection criteria in investigated cultivars of sugar beet. Finally, 7221 genotypes can be considered as tolerant genotypes in the next studies. In comparison, Jolgeh cultivar (as susceptible control) yielded well in areas with normal irrigation, but under moderate and severely stresses its root yield was reduced.

Multi-objective Optimization Response Modeling to Contaminated Water Distribution Networks: Pressure Driven versus Demand Driven Analysis

Seyyed Nasser Bashi-Azghadi,Mohammad Hadi Afshar,Abbas Afshar 대한토목학회 2017 KSCE JOURNAL OF CIVIL ENGINEERING Vol.21 No.6

Implementation of management strategies following contamination detection in water distribution networks may extensively change operational mode of nominated valves and hydrants. The commonly used demand driven network solvers may fail to realistically represent system’s performances of new topology due to possible pressure-deficient condition. Realizing their drawbacks, this paper integrates a Pressure Driven Network Solver (PDNS) with multi-objective Non-dominated Sorting Genetic Algorithm-II (NSGA-II) in a simulation-optimization scheme. It is illustrated that the two commonly used objective functions, namely minimization of consumed contamination mass and number of polluted nodes, may be in conflict when an operational strategy is implemented. A trade-off is developed to help decision-maker compromise between restraining spatial spread of contaminant and its risk to public health. Decision variables in this optimization model are valve closure and hydrant opening. Each trial solution developed by the NSGA-II addresses a new system topology by changing operational modes of the nominated valves and hydrants. The PDNS determines the nodal pressures and refines the nodal withdraw for trial solution. To illustrate the performance of the proposed methodology, Net3 from EPANET 2 is employed. The results show that the pressure-driven analysis is more realistic and appropriate in comparison with demand-driven analysis in operational conditions.

Surveying the Relations among Traits Affecting Seed Yield in Sesame (Sesamum indicum L.)

Seyyed Hamid Reza Ramazani 한국작물학회 2016 Journal of crop science and biotechnology Vol.19 No.4

To determine the most important traits influencing seed yield of sesame, 18 lines were evaluated in a randomized block design with three replicates in two years during the 2013 and 2014 growing seasons. Following a combined analysis of variance, multivariate statistical analyses such as simple correlation coefficients, factor analysis, stepwise analysis, path analysis, and cluster analysis were administered on combined means. The correlation coefficient analysis showed a significant negative correlation between seed yield and number of capsules per plant and number of seeds per capsule. Correlation between germination period and seed yield was positive and significant at 5% probability level. Factor analysis divided the 14 measured variables into five factors. In the stepwise regression analysis for seed yield as the independent variable, four traits including number of capsules per plant, first capsule height, number of seeds per capsule, and stem length to first capsule were entered into the regression model in four steps with r 2 =0.72. The regression coefficient of number of capsules per plant, number of seeds per capsule, and stem length to first capsule were negative and the regression coefficient of the first capsule height was positive and significant at the 5% probability level. The path coefficient analysis based on seed yield as a dependent variable implicated that the number of seeds per capsule had the highest negative direct effect on seed yield. The highest negative indirect effect on seed yield was related to the number of capsules per plant through the number of seeds per capsule. Cluster analysis using Ward’s method divided 18 investigated lines into five clusters.

A Novel Nonlinear Robust Guidance Law Design Based On SDRE Technique

Seyyed Sajjad Moosapour,Ghasem Alizadeh,Sohrab Khanmohammadi,Seyyed Hamzeh Moosapour 한국항공우주학회 2012 International Journal of Aeronautical and Space Sc Vol.13 No.3

A nonlinear robust guidance law is designed for missiles against a maneuvering target by incorporating sliding-mode and optimal control theories based on the state dependent Riccati equation (SDRE) to achieve robustness against target accelerations. The guidance law is derived based on three-dimensional nonlinear engagement kinematics and its robustness against disturbances is proved by the second method of Lyapunov. A new switching surface is considered in the sliding-mode control design. The proposed guidance law requires the maximum value of the target maneuver, and therefore opposed to the conventional augmented proportional navigation guidance (APNG) law, complete information about the target maneuver is not necessary, and hence it is simple to implement in practical applications. Considering different types of target maneuvers, several scenario simulations are performed. Simulation results confirm that the proposed guidance law has much better robustness, faster convergence, and smaller final time and control effort in comparison to the sliding-mode guidance (SMG) and APNG laws.