Optimal Design Parameters of Exhaust Valve Spring in IC Engines UsingMetaheuristic Algorithms

A. Arabi,H. osman 제어로봇시스템학회 2021 제어로봇시스템학회 국제학술대회 논문집 Vol.2021 No.10

The exhaust valve is responsible for the engine"s smooth operation. Exhaust gases are directed from the combustion chamber to the exhaust manifold via the exhaust valve. Valve springs are subjected to tensile strains as a result of gas pressure fluctuations, fluctuating loads, and elasticity loosening as the IC engine runs. Excessive valve noise and internal engine damage can be caused by weak or cracked exhaust valve springs in an IC engine. Recent Metaheuristic Algorithms, such as Sin-Cos, PSO, GPSO, Cukoo, and ABC, are utilized in this study to find the best design parameters for the exhaust valve spring while keeping the spring"s deflection, shear stresses, and fatigue in mind. The PSO and Sin-Cos algorithms outperform the others in terms of speed of convergence, while the GPSO achieves a helical spring weight of 2.1N.

Electrospun Polycaprolactone/Graphene/Baghdadite Composite Nanofibres with Improved Mechanical and Biological Properties

Delara Aarabi Samani,Ali Doostmohammadi,Mohammad Reza Nilforoushan,Hassan Nazari 한국섬유공학회 2019 Fibers and polymers Vol.20 No.5

Polycaprolactone (PCL) based nanocomposite scaffolds containing graphene (Gr) and baghdadite (BAG)nanoparticles were fabricated using the electrospinning method. Mechanical properties of the scaffolds were evaluated. Viability and adhesion of cells on the scaffolds were confirmed using fluorescence optical microscopy, MTT and FE-SEManalysis methods. The results indicated that incorporation of various concentrations of BAG from 1 to 3 wt% notablyimproved the mechanical properties. Cell adhesion assay revealed that the addition of BAG nanoparticles to PCL-Gr scaffoldcaused further adhesion, viability, and proliferation of the cells.

Epidemiological Pattern of Breast Cancer in Iranian Women: Is there an Ethnic Disparity?

Taheri, Neger Sadat,Nosrat, Sepideh Bakhshandeh,Aarabi, Mohsen,Tabiei, Mohammad Naeimi,Kashani, Elham,Rajaei, Siamak,Besharat, Sima,Semnani, Shahryar,Roshandel, Gholamreza Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.9

Introduction: Northeastern Iran is known as a high risk area of upper gastrointestinal cancers. Recent reports have suggested a declining trend for these cancers as well as an increase in the incidence of other malignancies including breast cancer. Our present aim was to describe the epidemiological pattern of breast cancer in this region during 2004-2009. Methods: All new cancer cases from public and private diagnostic and therapeutic centers of Golestan province were registered. A structured questionnaire was prepared and used based on the standerds of the International Association of Cancer Registries. The international classification of diseases for oncology was considered for coding. Age standardized incidence rates (ASR) of breast cancer were calculated. Results: A total of 11,038 new cancer cases were registered during 2004-2009, of which, 1,101 (10%) were females with breast cancer. The median age of the breast cancer patients was 46 years. The ASR for breast cancer was 28 per 100,000 person-years. We found an unusual rapid increase in breast cancer rate at the age of 25 years. The ASR of breast cancer was significantly lower in females from Turkmen ethnicity and those from rural areas(P value <0.01). Conclusion: Our study showed high rate of breast cancer in Golestan province of Iran. We found an unusual peak of breast cancer in young women. So, the age of starting screening programs may need to be revised in this area. The rate of breast cancer was significantly lower in women from Turkmen ethnicity. Further studies are warranted to clarify the role of important determinants, especially regarding the ethnic disparity, on breast cancer in this region.

Serum Vitamin D Status in Iranian Fibromyalgia Patients: according to the Symptom Severity and Illness Invalidation

Maafi, Alireza Amir,Ghavidel-Parsa, Banafsheh,Haghdoost, Afrooz,Aarabi, Yasaman,Hajiabbasi, Asghar,Masooleh, Irandokht Shenavar,Zayeni, Habib,Ghalebaghi, Babak,Hassankhani, Amir,Bidari, Ali The Korean Pain Society 2016 The Korean Journal of Pain Vol.29 No.3

Background: This study was designed to assess serum vitamin D status (25-OHD) in the fibromyalgia (FM) patients and to compare it with a healthy control group. It also aimed to investigate the correlation of serum vitamin D level with FM symptom severity and invalidation experiences. Methods: A total of 74 consecutive patients with FM and 68 healthy control participants were enrolled. The eligible FM patients completed the Illness Invalidation Inventory (3*I), the Revised Fibromyalgia Impact Questionnaire (FIQR) and a short-form health survey (SF-12). Venous blood samples were drawn from all participants to evaluate serum 25-OHD levels. Mann-Whitney tests and multiple logistic regression analyses were performed and Spearman's correlations were calculated. Results: 88.4% of FM patients had low levels of serum 25-OHD. FM patients had significantly higher level of serum 25-OHD than the control group ($17.24{\pm}13.50$ and $9.91{\pm}6.47$ respectively, P = 0.0001). There were no significant correlations between serum 25-OHD levels and the clinical measures of disease impact, invalidation dimensions, and health status. Multiple logistic regression analyses revealed that an increased discounting of the disease by the patient's spouse was associated with a 4-fold increased risk for vitamin D deficiency (OR = 4.36; 95% CI, 0.95-19.87, P = 0.05). Conclusions: This study showed that although high rates of vitamin D insufficiency or deficiency were seen among FM patients and healthy non-FM participants, but it seems there was no intrinsic association between FM and vitamin D deficiency. Addressing of invalidation experience especially by the patient's spouse is important in management of FM.

Serum Vitamin D Status in Iranian Fibromyalgia Patients: according to the Symptom Severity and Illness Invalidation

( Alireza Amir Maafi ),( Banafsheh Ghavidel-parsa ),( Afrooz Haghdoost ),( Yasaman Aarabi ),( Asghar Hajiabbasi ),( Irandokht Shenavar Masooleh ),( Habib Zayeni ),( Babak Ghalebaghi ),( Amir Hassankha 대한통증학회 2016 The Korean Journal of Pain Vol.29 No.3

Background: This study was designed to assess serum vitamin D status (25-OHD) in the fibromyalgia (FM) patients and to compare it with a healthy control group. It also aimed to investigate the correlation of serum vitamin D level with FM symptom severity and invalidation experiences. Methods: A total of 74 consecutive patients with FM and 68 healthy control participants were enrolled. The eligible FM patients completed the Illness Invalidation Inventory (3*I), the Revised Fibromyalgia Impact Questionnaire (FIQR) and a short-form health survey (SF-12). Venous blood samples were drawn from all participants to evaluate serum 25-OHD levels. Mann-Whitney tests and multiple logistic regression analyses were performed and Spearman’s correlations were calculated. Results: 88.4% of FM patients had low levels of serum 25-OHD. FM patients had significantly higher level of serum 25-OHD than the control group (17.24 ± 13.50 and 9.91 ± 6.47 respectively, P = 0.0001). There were no significant correlations between serum 25-OHD levels and the clinical measures of disease impact, invalidation dimensions, and health status. Multiple logistic regression analyses revealed that an increased discounting of the disease by the patient’s spouse was associated with a 4-fold increased risk for vitamin D deficiency (OR = 4.36; 95% CI, 0.95-19.87, P = 0.05). Conclusions: This study showed that although high rates of vitamin D insufficiency or deficiency were seen among FM patients and healthy non-FM participants, but it seems there was no intrinsic association between FM and vitamin D deficiency. Addressing of invalidation experience especially by the patient’s spouse is important in management of FM. (Korean J Pain 2016; 29: 172-8)

Enrolment Phase Results of the Tabari Cohort Study: Comparing Family History, Lipids and Anthropometric Profiles Among Diabetic Patients

Mahmood Moosazadeh,Mohammad Khademloo,Kaveh Jafari,Motahareh Kheradmand,Zahra Kashi,Mohsen Aarabi,Adeleh Bahar,Mahdi Afshari 질병관리본부 2019 Osong Public Health and Research Persptectives Vol.10 No.5

Objectives: Different factors are responsible for the silent epidemic of diabetes mellitus in developing and developed countries. This study aimed to determine the role of demographic factors, lipid profile, family history (the estimation of genetic association) and anthropometric factors on diabetes onset. Methods: Data from the enrolment phase of the Tabari Cohort study was applied for this study and included 10,255 participants aged between 35-70 years. Anthropometric variables were measured by trained staff using standard tools. Blood specimens were collected for lipid profile and blood glucose measurements. Data analyses were performed using SPSS version 24, with univariate and multivariate logistic regression. Results: The prevalence of diabetes mellitus was estimated to be 17.2% in the cohort population, 15.6% in men, and 18.3% in women. The adjusted odds ratios (95% confidence intervals) for age groups 40- 49, 50-59 and over 60 were 2.58 (2.20-3.69), 5.80 (4.51-7.48) and 8.72 (6.67-11.39), respectively. In addition, the odds ratios (95% confidence intervals) for 2 (or more), and 1 affected family member were 4.12 (3.55-4.90) and 2.34 (2.07-2.65), respectively. Triglyceride concentrations more than 500, and abnormal high-density lipoprotein levels increased the odds of diabetes mellitus by 3.29- and 1.18- fold, respectively. Conclusion: The current study showed that old age and a family history were strong predictors for diabetes mellitus.

Predictors of Colorectal Cancer Survival in Golestan, Iran: A Population-based Study

Mohammad Aryaie,Gholamreza Roshandel,Shahryar Semnani,Mohsen Asadi-Lari,Mohsen Aarabi,Mohammad Ali Vakili,Vahideh Kazemnejhad,Seyed Mehdi Sedaghat,Masoud Solaymani-Dodaran 한국역학회 2013 Epidemiology and Health Vol.35 No.-

OBJECTIVES: We aimed to investigate factors associated with colorectal cancer survival in Golestan, Iran. METHODS: We used a population based cancer registry to recruit study subjects. All patients registered since 2004 were contacted and data were collected using structured questionnaires and trained interviewers. All the existing evidences to determine the stage of the cancer were also collected. The time from first diagnosis to death was compared in patients according to their stage of cancer using the Kaplan-Meir method. A Cox proportional hazard model was built to examine their survival experience by taking into account other covariates. RESULTS: Out of a total of 345 subjects, 227 were traced. Median age of the subjects was 54 and more than 42% were under 50 years old. We found 132 deaths among these patients, 5 of which were non-colorectal related deaths. The median survival time for the entire cohort was 3.56 years. A borderline significant difference in survival experience was detected for ethnicity (log rank test, p=0.053). Using Cox proportional hazard modeling, only cancer stage remained significantly associated with time of death in the final model. CONCLUSIONS: Colorectal cancer occurs at a younger age among people living in Golestan province. A very young age at presentation and what appears to be a high proportion of patients presenting with late stage in this area suggest this population might benefit substantially from early diagnoses by introducing age adapted screening programs.