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A new robust predictive model for lost circulation rate using convolutional neural network:A case study from Marun Oilfield

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Petroleum 2023年第3期9卷 468-485页

作者： Farshad Jafarizadeh Babak Larki bamdad kazemi Mohammad Mehrad Sina Rashidi Jalil Ghavidel Neycharan Mehdi Gandomgoun Mohammad Hossein Gandomgoun Department of Petroleum Engineering Amirkabir University of TechnologyTehranIran Department of Petroleum Engineering Omidiyeh Branch of Islamic Azad UniversityOmidiyehIran Science and Research Branch Islamic Azad UniversityTehranIran Faculty of Mining Petroleum and Geophysics EngineeringShahrood University of TechnologyShahroodIran Department of Information Technology and Computer Engineering Shahid Madani University of AzerbaijanTabrizIran Faculty of Petroleum Engineering Sahand University of TechnologyTabrizIran

A major cause of some of serious issues encountered in a drilling project,including wellbore instability,formation damage,and drilling string stuck e which are known to increase non-productive time(NPT)and hence the drilling cost e is what we know as mud *** mud loss can be prevented or at least significantly reduced by taking proper measures beforehand provided the position and intensity of such loss can be properly predicted using an accurate predictor ***,in this study,we used the convolutional neural network(CNN)and hybridized forms of multilayer extreme learning machine(MELM)and least square support vector machine(LSSVM)with the Cuckoo optimization algorithm(COA),particle swarm optimization(PSO),and genetic algorithm(GA)for modeling the mud loss rate based on drilling data,mud properties,and geological information of 305 drilling wells penetrating the Marun *** this purpose,we began by a pre-processing step to attenuate the effect of noise using the Savitzky-Golay *** whole set of available data was divided into the modeling(including 2300 data points)and the validation(including 483 data points)***,the second generation of the non-dominated sorting genetic algorithm(NSGA-Ⅱ)was applied to the modeling data to identify the most significant features for estimating the mud *** results showed that the prediction accuracy increased with the number of selected features,but the increase became negligible when the number of selected features exceeded ***,the following 9 features were selected as input to the intelligent algorithms(IAs):pump pressure,mud weight,fracture pressure,pore pressure,depth,gel 10 min/gel 10 s,fan 600/fan 300,flowrate,and formation *** of the hybrid algorithms and simple forms of LSSVM and CNN to the training data(80%of the modeling data,i.e.1840 data points)showed that all of the models tend to underestimate the mud loss at higher mud loss rates,although the CNN exhibited l

关键词： Lost circulation prediction Artificial intelligence Deep learning Feature selection

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Numerical study of the near-wall vortical structures in particle-laden turbulent flow by a new vortex identification method-Liutex

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Journal of Hydrodynamics 2024年第1期36卷 53-60页

作者： Farid Rousta Goodarz Ahmadi bamdad Lessani Chaoqun Liu Department of Mechanical and Aerospace Engineering Clarkson UniversityPotsdamNYUSA Mechanical Engineering and Engineering Science The University of North Carolina at CharlotteNCUSA Department of Mathematics University of Texas at ArlingtonArlingtonTXUSA

This study investigates turbulent particle-laden channel flows using direct numerical simulations employing the Eulerian-Lagrangian method.A two-way coupling approach is adopted to explore the mutual interaction between particles and fluid *** considered cases include flow with particle Stokes number varying from St=2 up to St=100 while maintaining a constant Reynolds number of Reτ=180 across all cases.A novel vortex identification method,Liutex(Rortex),is employed to assess its efficacy in capturing near-wall turbulent coherent structures and their interactions with *** Liutex method provides valuable information on vortex strength and vectors at each location,enabling a detailed examination of the complex interaction between fluid and particulate *** widely acknowledged,the interplay between clockwise and counterclockwise vortices in the near-wall region gives rise to low-speed streaks along the *** low-speed streaks serve as preferential zones for particle concentration,depending upon the particle Stokes *** is shown that the Liutex method can capture these vortices and identify the location of low-speed ***,it is observed that the particle Stokes number(size)significantly affects both the strength of these vortices and the streaky structure exhibited by ***,a quantitative analysis of particle behavior in the near-wall region and the formation of elongated particle lines was carried *** involved examining the average fluid streamwise velocity fluctuations at particle locations,average particle concentration,and the normal velocity of particles for each set of particle Stokes *** investigation reveals the intricate interplay between particles and near-wall structures and the significant influence of particles Stokes *** study contributes to a deeper understanding of turbulent particle-laden channel flow dynamics.

关键词： Turbulent channel flow particle-laden flow direct numerical simulation(DNS) Eulerian-Lagrangian vortex identification turbulence coherent structures Liutex

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Nonlinear Modeling and Analysis of a Novel Robot Fish with Compliant Fluidic Actuator as a Tail

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Journal of Bionic Engineering 2022年第3期19卷 629-642页

作者： Behzad Janizadeh Haji Mahdi bamdad School of Mechanical and Mechatronics Engineering Shahrood University of TechnologyShahrood***Iran

Compliant mobile robotics is a developing bioinspired concept of propulsion for *** paper studies the modeling and analysis of a compliant tail-propelled fish-like *** biomimetic design uses a fluid-filled network of channels embedded into the soft body to actuate the compliant tail and generate *** study analyzes the nonlinear dynamics of Fish Tail Fluidic Actuator(FTFA).The fluidic expansion under pressure creates a bending moment in the *** is demonstrated that the tail response follows the theoretical formulation extracted from the accurate *** this modeling,tail is assumed as a continuous Euler–Bernoulli beam considering large deflection and nonlinear ***,the implementation of Hamilton's principle and the method of calculation lead to the motion *** assumed mode method is used to achieve the mathematical model in the multi-mode system that is more similar to the soft continuous *** investigate the tendencies of the tail amplitude,swimming speed,and Strouhal number when the input driving frequency *** simulation results disclose that high swimming efficiency can be obtained at the multi-order resonances;meanwhile,the compliant fish robot is pushed at the corresponding frequency illustrating nonlinear behavior.

关键词： Compliant robotic fish Nonlinear continuous model Fluidic actuator Assume mode method Resonant effect

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Optimal Synthesis of the Stephenson-Ⅱ Linkage for Finger Exoskeleton Using Swarm-based Optimization Algorithms

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Journal of Bionic Engineering 2023年第4期20卷 1569-1584页

作者： Seyyed Mojtaba Varedi-Koulaei Masoud Mohammadi Mohammad Amin Malek Mohammadi Mahdi bamdad Corrective Exercise and Rehabilitation Laboratory Department of Mechanical EngineeringShahrood University of TechnologyShahrood***Iran Department of Health Science and Technology Aalborg University9220AalborgDenmark

Active exoskeletons have been widely investigated to supplement and restore human hand movements,but a significant limitation is that they have a complicated design requiring multi *** Degree-Of-Freedom(DOF)planar linkage mechanisms could be used with simple *** research represents the design and optimization of a mechanism proposed for a finger exoskeleton bionic *** DOF six-bar linkage Stephenson-II is selected,and a motion-generation mechanism synthesis problem is *** design is based on the data obtained from the flexion/extension motion of the index finger through 16 precision points and 16 angles for each phalange associated with the fingertip *** explaining the kinematic analysis of the Stephenson-II,an evaluation of swarm intelligence techniques,including PSO,GWO,and ARO algorithms for solving optimization problems,is *** algorithm demonstrates the best performance among ***,the optimized mechanism in this study has a 50% error reduction compared to the one previously designed(Bataller et *** Mech Mach Theory 105:31-43,2016).

关键词： Mechanism synthesis Bionic Finger exoskeleton PSO GWO ARO

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Analytical dynamic solution of a flexible cable-suspended manipulator

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Frontiers of Mechanical Engineering 2013年第4期8卷 350-359页

作者： Mahdi bamdad Mechatronics Research Laboratory College of Mechanical EngineeringShahrood University of Technology

Cable-suspended manipulators are used in large scale applications with,heavy in weight and long in span *** seems impractical to maintain cable assumptions of smaller robots for large scale *** interactions among the cables,platforms and actuators can fully evaluate the coupled dynamic *** structural flexibility of the cables becomes more pronounced in large *** this paper,an analytic solution is provided to solve cable ***,a closed form solution can be adopted to improve the dynamic response to *** output is provided by the optimal torque generation subject to the actuator limitations in a mechatronic ***,the performance of the proposed algorithm is examined through simulations.

关键词： parallel robot flexible cable suspended robot dynamic

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Acute Morphine Administration Reduces Cell-Mediated Immunity and Induces Reactivation of Latent Herpes Simplex Virus Type 1 in BALB/c Mice

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Cellular & Molecular Immunology 2009年第2期6卷 111-116页

作者： Shafi Mojadadi Abbas Jamali Behzad Khansarine jad Hoorieh Soleimanjahi Taravat bamdad Neuroscience research center Kerman University of Medical Sciences Department of Virology Faculty of medical science Tarbiat Modares University Dept of virology School of medicalsciences Tarbiat Modares University Dept of Microbiology Arak University of Medical Sciences

Acute morphine administration is known to alter the course of herpes simplex virus infection. In this study, the effect of acute morphine administration on the reactivation of latent herpes was investigated in a mouse model. Because of the important role of cytolytic T lymphocyte （CTL） activity in the inhibition of herpes simplex virus type 1 （HSV-1） reactivation, the effect of acute morphine administration on CTL responses was also evaluated. Furthermore, lymphocyte proliferation and IFN-γ production were evaluated for their roles in the induction of the CTL response. The findings showed that acute morphine administration significantly reduced CTL responses, lymphocyte proliferation, and IFN-γ production. Furthermore, acute morphine administration has been shown to reactivate latent HSV-γ. Previous studies have shown that cellular immune responses have important roles in the inhibition of HSV reactivation. These findings suggest that suppression of a portion of the cellular immune response after acute morphine administration may constitute one part of the mechanism that induces HSV reactivation.

关键词： acute morphine herpes simplex virus-1 reactivation cell-mediated immunity

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Effects of Qigong Exercises on 3 Different Parameters of Human Saliva

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Chinese Journal of Integrative Medicine 2008年第4期14卷 262-266页

作者： Saeed Bayat-Movahed Yadollah Shayesteh Homan Mehrizi Shermin Rezayi Kobra bamdad Banafsheh Golestan Mansoureh Mohamadi Sports Medicine Research Center Medical Sciences/University of TehranTehranIran Department of Periodontics Faculty of DentistryMedical Sciences/University of TehranTehranIran Yang's Martial Art Association Iran Department of Immunology Faculty of MedicineMedical Sciences/University of TehranTehranIran Department of Epidemiology Faculty of MedicineMedical Sciences/University of TehranTehranIran Community Dentistry Department Medical Sciences/University of TehranTehranIran

Objective： To analyze the effects of a Qigong program on various parameters of unstimulated saliva, including volume, pH and secretory immunoglobulin A （S-IgA） level. Methods： Twice a day from the beginning of Fall 2005, twenty-three healthy volunteers aged 22-24 did special Qigong exercises and massage of acupuncture points which stimulated the energy cycle and increased body water energy. The unstimulated saliva volume and pH were recorded every week in Spring （April, May, June） 2005 before the volunteers started to learn and exercise Qigong, and after Qigong intervention in Spring （April, May, June） 2006. During the period of study, saliva was collected in the same location and on similar dates at the Dental Faculty of Tehran University of Medical Sciences. The S-IgA levels of the last samples of the last week of Spring 2005 and 2006 were measured. Results： The unstimulated saliva volume after Qigong exercises （2.94±0.20 mL/5min） was significantly higher as compared to the pre-Qigong phase （1.65±0.102 mL/5min, P〈0.05）. The S-IgA level was 105.45±69.41 mg/mL before doing Qigong exercises, and 156.23±88.56 mg/mL after doing Qigong exercises, and a statistically significant difference was seen between the two measurements （P=0.005）. The change in pH was not statistically significant. Conclusions： The application of Qigong is beneficial for increasing salivary volume and other parameters. Moreover, the results suggest that Qigong may be a useful medication for patients with salivary hyposecretion. Further research is recommended in examining the long-term effects of Qigong on improving salivary volume and other parameters in individuals with salivary hyposecretion.

关键词： Qigong saliva secretory immunoglobulin A

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Towards Iran Vision 2025: Strategic Management Challenges

Towards Iran Vision 2025: Strategic Management Challenges

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2010公共管理国际会议（第六届）

作者： Nasser bamdad State Management Training Centre Tehran Iran

In spite of the limitations of new public management paradigm and strategic management framework, there is a tendency in using the framework in Iran’s public sector. In Iran, the strategic management thinking has been taught in the State Management Training Center and management schools for three decades in the light of new public management paradigm. This paradigm reduces and simplifies public issues at organizational and managerial levels by ignoring political, social and economic debates. A simple image of a public issue attracts the attentions of practitioners who want to see and act in a realistic and practical framework. This paper focuses on the challenges of strategic management framework as a way of implementing the development plans for reaching to Iran vision 2025. For example, it is argued that government is not a large organization and strategic management framework is not an appropriate tool for national level of analysis.

关键词： Strategic management Country vision Public interest

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Evaluation of Comparative Management of Expanded Program Immunization for Children in Iran and in the World

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Health 2014年第19期6卷 2697-2704页

作者： Fereshteh Farzianpour Kobra bamdad Mehrabani Nayeb Fadaei Dehcheshmeh Mohammad Azmal Department of Health Management and Economics School of Public Health Tehran University of Medical Sciences Tehran Iran Department of Immunology School of Medicine Tehran University of Medical Sciences Tehran Iran

Background: EPI is one of the most cost-effective public health interventions that have already been identified. Mass vaccination is one of the most effective public health strategies that lead to a dramatic reduction in the incidence of many infectious diseases. This is a descriptive study (eco-logical exploratory) where data about the status of routine immunization of children under 6 years in 6 selected countries in terms of the routine immunization programs in each country, the coverage and reported cases of vaccine-preventable diseases from 2006 to 2008 were collected assuming that each country is a representative of a Continent;data about the status of Iran were also collected and a comparative study was performed in the next step. It is worth mentioning that selecting these countries was according to health experts to consolidate the data. Collection tools are data of international (WHO and UNICEF) and national organizations of the above countries. In all countries surveyed, triple vaccine, vaccines of polio, hepatitis B, measles, rubella and mumps are part of the routine immunization program for children under the age of 6 years, with the explanation that in South Africa only measles vaccine is injected instead of measles, rubella and mumps vaccines. The coverage rate of the vaccine and other vaccines in Iran was the best compared to other countries. This represents the widespread activity of health care systems of the country in the field of vaccination and tireless efforts of healthcare workers and health centers.

关键词： Evaluation Comparative Management Program Immunization Children Iran World

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System Vulnerability Analysis Using Graph Pathfinding Strategies in Partitioned Networks

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Journal of Power and Energy Engineering 2017年第4期5卷 15-24页

作者： Milad Ghiasi Rad Pedram Gharghabi Mohiyeddin Rahmani bamdad Falahati Computer Science and Engineering Department University of Nebraska-Lincoln Lincoln United States Department of Computer and Electrical Engineering Mississippi State University Mississippi United States Department of Electrical Engineering Amirkabir University of Technology Tehran Iran Engineering Services Schweitzer Engineering Laboratories Inc. Pullman WA United States

In this paper, a new method has been introduced to find the most vulnerable lines in the system dynamically in an interconnected power system to help with the security and load flow analysis in these networks. Using the localization of power networks, the power grid can be divided into several divisions of sub-networks in which, the connection of the elements is stronger than the elements outside of that division. By using our proposed method, the probable important lines in the network can be identified to do the placement of the protection apparatus and planning for the extra extensions in the system. In this paper, we have studied the pathfinding strategies in most vulnerable line detection in a partitioned network. The method has been tested on IEEE39-bus system which is partitioned using hierarchical spectral clustering to show the feasibility of the proposed method.

关键词： Power Systems Network Graph Partitioning Path Finding Vulnerability Analysis

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