Lattice Boltzmann simulation of the three-dimensional motions of particles with various density ratios in lid-driven cavity flow

Safdari, A.,Kim, K.C. Elsevier [etc.] 2015 Applied Mathematics and Computation Vol.265 No.-

An estimation of solid particle dynamics through a fluid has been studied. Although traditional computational fluids dynamics models can predict multiphase flow and the interactions between the fluid and solid particles, a high level of accuracy of an appropriate numerical model for this type of difficulty is still in demand. Some researchers examining this problem dedicated their research to the particle motions under the influence of gravity. Therefore, in this study a modern computational fluid dynamic model, the Lattice Boltzmann Method (LBM), was proposed to predict the three-dimensional cubic lid-driven cavity flow and combined with the Lagrangian approach on the prediction of solid particles in the range of different density ratios. To solve the term, flow fluid, the mesoscale numerical scheme of the Multi Relaxation Time (MRT) lattice Boltzmann method was used to simulate the objects at higher stability. In the present study, the different densities of the particles were considered and the effects of gravity were included in the calculation. The 4th Runge-Kutta method was functioned to determine the effect of an external force on a particle because this method is accurate enough compared to other known numerical schemes. The hard sphere model was used to model particle-particle and particle-wall collisions. The solid particle subtleties determined using a numerical fluid dynamic simulation of LBM showed good agreement with the reputable benchmark results by previous researchers. Furthermore, according to the results, the dependency of the particle trajectories on the magnitude of the density of the particles can be observed. The results revealed the significant effect of collision, drag force, gravity force, and vortex structure on a particle's trajectory. Consequently, the LBM model is suitable for this type of problem, and the proposed model is expected to have a wide range of applications.

Layered 2D alkyldiammonium lead iodide perovskites: synthesis, characterization, and use in solar cells

Safdari, Majid,Svensson, Per H.,Hoang, Minh Tam,Oh, Ilwhan,Kloo, Lars,Gardner, James M. The Royal Society of Chemistry 2016 Journal of materials chemistry. A, Materials for e Vol.4 No.40

<P>The synthetic route and properties of three 2D hybrid organic/inorganic lead iodide perovskite materials are reported. The 2D perovskites were synthesized from the reaction between PbI2and the di-cations of 1,4-diaminobutane, 1,6-diaminohexane, and 1,8-diaminooctane. The resulting products were [NH3(CH2)4NH3]PbI4(BdAPbI4), [NH3(CH2)6NH3]PbI4(HdAPbI4), and [NH3(CH2)8NH3]PbI4(OdAPbI4). Structural characterization shows that two dimensional perovskite structures were formed with inorganic structural planes separated by organic layers. Absorption spectra show band gaps of 2.37 eV (BdAPbI4), 2.44 eV (HdAPbI4), and 2.55 eV (OdAPbI4). The 2D perovskite materials were investigated as light absorbing materials in solid state solar cells. The best performing material under moist, ambient conditions wasBdAPbI4(1.08% efficiency), which was comparable to methylammonium Pb(ii) iodide (MAPbI3) solar cells (2.1% efficiency) manufactured and studied under analogous conditions. When compared toMAPbI3, the 2D materials have larger band gaps and lower photoconductivity, whileBdAPbI4based solar cells shows a comparable absorbed photon-to-current efficiency as compared toMAPbI3based ones.</P>

Lattice Boltzmann simulation of solid particles behavior in a three-dimensional lid-driven cavity flow

Safdari, A.,Kim, K.C. Pergamon Press ; Elsevier Science Ltd 2014 COMPUTERS & MATHEMATICS WITH APPLICATIONS - Vol.68 No.5

This paper reports the behavior of solid particles in a three-dimensional lid-driven cavity. The prediction of solid particle dynamics through a fluid has been an important research topic over the past few decades. Difficulties arise when trying to understand the interactions between the particle and surrounding fluid. Therefore, the Lattice Boltzmann Method (LBM) was proposed to analyze three-dimensional cubic lid-driven cavity flow at range of Reynolds numbers. The mesoscale numerical scheme of the Single Relaxation Time (SRT) lattice Boltzmann method was used to solve the equation of flow fluid. The 4th Runge-Kutta method was applied to determine the effects of the drag force on the particle, and the hard sphere model was functioned to calculate the collisions between the particle and walls. The dynamics of a solid particle using a numerical simulation of LBM showed good agreement with the established benchmark results from previous studies. In addition, the results showed that the particle trajectories are critically dependent on the magnitude of the density, diameter and vortex behavior in the cavity. Overall, the results highlight the applicability of the present method to a range of applications.

RFID Technology in Health Environment Opportunities and Challenges for Modern Cancer Care

Safdari, Reza,Maserat, Elham,Maserat, Elnaz Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.12

Cancers are significant contributors to the mortality and health care expenditures. Cancer can be reduced and monitored by new information technology. Radio frequency identification or RFID is a wireless identification technology. The use of this technology can be employed for identifying and tracking clinical staff, patients, supplies, medications and equipments. RFID can trace and manage chemotherapy drugs. There are different types of RFID. Implantable RFID allowing a chip to be embedded under the skin and that store the cancer patient's identifier. These are concerns about applications of RFID. Privacy, security and legal issues are key problems. This paper describes capabilities, benefits and confidentiality aspects in radio frequency identification systems and solutions for overcoming challenges.

INVESTIGATION OF PARTICLE MOTIONS IN THREE-DIMENSIONAL LID DRIVEN CAVITY

Arman Safdari,Kyung Chun Kim 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.5-2

Effect of Evening Primrose Oil on Postmenopausal Psychological Symptoms: A Triple-Blind Randomized Clinical Trial

( Faranak Safdari ),( Bahareh Motaghi Dastenaei ),( Soleiman Kheiri ),( Zohreh Karimiankakolaki ) 대한폐경학회 2021 대한폐경학회지 Vol.27 No.2

Objectives: Psychological symptoms of menopause may impose a negative effect on the quality of life of menopausal women. Thus, the management of these symptoms can improve the quality of life and psychological health of such woman. The present study aimed to determine the effect of evening primrose on psychological symptoms in menopausal women. Methods: In this triple-blind randomized clinical trial, the effect of the evening primrose oil on postmenopausal psychological symptoms was investigated. The subjects were 100 menopausal women, referred to a healthcare center in Dastena city (Chaharmahal and Bakhtiari Province, Iran), who were randomly assigned to two groups. The intervention group used two 1 g pearls of evening primrose oil daily. The study instruments included a sub-scale of Menopause Rating Scale (MRS). Menopause data were analyzed using an independent t -test and Friedman test by the SPSS software. P values < 0.05 were considered statistically significant. Results: The two groups were balanced in demographic characteristics and psychological disorder severity before the intervention. The median (interquartile range) MRS score in the intervention group before the intervention and 2 and 4 weeks after the intervention were 11 (10-12), 6 (5-7), and 3 (2-4), respectively, and in the placebo, they were 11 (9-11), 10 (9-11), and 11 (10-12). A significant reduction was observed in the intervention group compared with the placebo group 2 and 4 weeks post-intervention. Conclusions: The use of evening primrose oil can decrease postmenopausal psychological symptoms.

The point-like particle tracking approach based on Lattice Boltzmann method for visualization of fluid-particle flows

Arman Safdari,Kyung Chun Kim 한국가시화정보학회 2015 한국가시화정보학회 학술발표대회 논문집 Vol.2015 No.5

The Intelligent Clinical Laboratory as a Tool to Increase Cancer Care Management Productivity

Mohammadzadeh, Niloofar,Safdari, Reza Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.6

Studies of the causes of cancer, early detection, prevention or treatment need accurate, comprehensive, and timely cancer data. The clinical laboratory provides important cancer information needed for physicians which influence clinical decisions regarding treatment, diagnosis and patient monitoring. Poor communication between health care providers and clinical laboratory personnel can lead to medical errors and wrong decisions in providing cancer care. Because of the key impact of laboratory information on cancer diagnosis and treatment the quality of the tests, lab reports, and appropriate lab management are very important. A laboratory information management system (LIMS) can have an important role in diagnosis, fast and effective access to cancer data, decrease redundancy and costs, and facilitate the integration and collection of data from different types of instruments and systems. In spite of significant advantages LIMS is limited by factors such as problems in adaption to new instruments that may change existing work processes. Applications of intelligent software simultaneously with existing information systems, in addition to remove these restrictions, have important benefits including adding additional non-laboratory-generated information to the reports, facilitating decision making, and improving quality and productivity of cancer care services. Laboratory systems must have flexibility to change and have the capability to develop and benefit from intelligent devices. Intelligent laboratory information management systems need to benefit from informatics tools and latest technologies like open sources. The aim of this commentary is to survey application, opportunities and necessity of intelligent clinical laboratory as a tool to increase cancer care management productivity.

Multi-Agent Systems: Effective Approach for Cancer Care Information Management

Mohammadzadeh, Niloofar,Safdari, Reza,Rahimi, Azin Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.12

Physicians, in order to study the causes of cancer, detect cancer earlier, prevent or determine the effectiveness of treatment, and specify the reasons for the treatment ineffectiveness, need to access accurate, comprehensive, and timely cancer data. The cancer care environment has become more complex because of the need for coordination and communication among health care professionals with different skills in a variety of roles and the existence of large amounts of data with various formats. The goals of health care systems in such a complex environment are correct health data management, providing appropriate information needs of users to enhance the integrity and quality of health care, timely access to accurate information and reducing medical errors. These roles in new systems with use of agents efficiently perform well. Because of the potential capability of agent systems to solve complex and dynamic health problems, health care system, in order to gain full advantage of E- health, steps must be taken to make use of this technology. Multi-agent systems have effective roles in health service quality improvement especially in telemedicine, emergency situations and management of chronic diseases such as cancer. In the design and implementation of agent based systems, planning items such as information confidentiality and privacy, architecture, communication standards, ethical and legal aspects, identification opportunities and barriers should be considered. It should be noted that usage of agent systems only with a technical view is associated with many problems such as lack of user acceptance. The aim of this commentary is to survey applications, opportunities and barriers of this new artificial intelligence tool for cancer care information as an approach to improve cancer care management.

From Self-care for Healthy People to Self-management for Cancer Patients with Cancer Portals

Azadmanjir, Zahra,Safdari, Reza,Ghazisaeidi, Marjan Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.4

Self-care to prevent cancer and self-management to cope with the disease are two discrete effective mechanisms for improving of control and management of neoplasia. Both them have certain strategies and practices. Often the two are used interchangeably despite their different approaches. Strategies of self-care usually refer to prevention at different levels include primary, secondary and tertiary. In contrast, strategies of self-management are related to management and alleviation of unpleasant cancer-related symptoms and treatment-related side effects for improving the quality of life of cancer survivors. Successful promoting of self-care and self-management strategies need people and survivor empowerment. Within this context, innovative approaches open a new window. In this paper after a brief review of related strategies and practices, we provide an explanation of how cancer portals may play an important role in the empowerment process and what are key potentials for implementing of self-care and self-management strategies for cancer.