Buckling analysis of nanoplate-type temperature-dependent heterogeneous materials

Karami, Behrouz,Karami, Sara Techno-Press 2019 Advances in nano research Vol.7 No.1

This paper develops a four-unknown refined plate theory and the Galerkin method to investigate the size-dependent stability behavior of functionally graded material (FGM) under the thermal environment and the FGM having temperature-dependent material properties. In the current study two scale coefficients are considered to examine buckling behavior much accurately. Reuss micromechanical scheme is utilized to estimate the material properties of inhomogeneous nano-size plates. Governing differential equations, classical and non-classical boundary conditions are obtained by utilizing Hamiltonian principles. The results showed the high importance of considering temperature-dependent material properties for buckling analysis. Different influencing parametric on the buckling is studied which may help in design guidelines of such complex structures.

SARS-CoV-2 in brief: from virus to prevention

Hassan Karami,Zeinab Karimi,Negin Karami 질병관리본부 2022 Osong Public Health and Research Persptectives Vol.13 No.6

The recent outbreak of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), a highly transmissible virus with a likely animal origin, has posed major and unprecedented challenges to millions of lives across the affected nations of the world. This outbreak first occurred in China, and despite massive regional and global attempts shortly thereafter, it spread to other countries and caused millions of deaths worldwide. This review presents key information about the characteristics of SARS-CoV-2 and its associated disease (namely, coronavirus disease 2019) and briefly discusses the origin of the virus. Herein, we also briefly summarize the strategies used against viral spread and transmission.

Modeling Dynamic Business Rules using A Dynamic Knowledge Approach

Karami, Nasser,Iijima, Junichi Korean Institute of Industrial Engineers 2007 Industrial Engineeering & Management Systems Vol.6 No.1

Business Rules are formal statements about the data and processes of an enterprise. They present projections of the organization's constraints and ways of working on their supporting information systems. Therefore, their collection, structuring and organization should be central activities within information systems. In an enterprise, business rules are used to represent certain aspects of a business domain (static rules) or business policy (dynamic rules). Hence, regarding problem domains in the organization, business rules are classified into two groups: static and dynamic business rules. The paper introduces a new concept of business rules, Extended Dynamic Business Rule (EDBR) which contains the results of the occurrence of business rule's action. The focus of this paper is in the organizing, defining and modeling of such business rules using Mineau's approach. Mineau's approach is an extension of Sowa's Conceptual Graph theory.

Sensitivity analysis of numerical schemes in natural cooling flows for low power research reactors

Karami, Imaneh,Aghaie, Mahdi Techno-Press 2017 Advances in energy research Vol.5 No.3

The advantages of using natural circulation (NC) as a cooling system, has prompted the worldwide development to investigate this phenomenon more than before. The interesting application of the NC in low power experimental facilities and research reactors, highlights the obligation of study in these laminar flows. The inherent oscillations of NC between hot source and cold sink in low Grashof numbers necessitates stability analysis of cooling flow with experimental or numerical schemes. For this type of analysis, numerical methods could be implemented to desired mass, momentum and energy equations as an efficient instrument for predicting the behavior of the flow field. In this work, using the explicit, implicit and Crank-Nicolson methods, the fluid flow parameters in a natural circulation experimental test loop are obtained and the sensitivity of solving approaches are discussed. In this way, at first, the steady state and transient results from explicit are obtained and compared with experimental data. The implicit and crank-Nicolson scheme is investigated in next steps and in subsequent this research is focused on the numerical aspects of instability prediction for these schemes. In the following, the assessment of the flow behavior with coarse and fine mesh sizes and time-steps has been reported and the numerical schemes convergence are compared. For more detail research, the natural circulation of fluid was modeled by ANSYS-CFX software and results for the experimental loop are shown. Finally, the stability map for rectangular closed loop was obtained with employing the Nyquist criterion.

FIXED POINT RESULTS ON S-METRIC SPACE VIA SIMULATION FUNCTIONS

Karami Abdullah,Sedghi Shaban,Shobe Nabi,Hyun H.G. 경남대학교 수학교육과 2019 Nonlinear Functional Analysis and Applications Vol.24 No.4

In this paper, we prove some common xed point theorems for two mappings satisfying generalized contractive condition in S-metric spaces via simulation functions. Our results extend and improve several previous well-known works.

Novel Tri- and Tetra-substituted Pyrimido[4,5-d]pyridazines: Regiospecific Synthesis Catalyzed by Silica Supported Yttrium Trinitrate

Karami, Bahador,Akrami, Sedigheh,Khodabakhshi, Saeed Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.12

Novel tri- and tetra-substituted pyrimido[4,5-d]pyridazines-2(1H,3H,7H)-ones have been synthesized via the regiospecific condensation reaction of hydrazine derivatives with 5-acetyl-4-aryloyl-6-methyl-3,4-dihydropyrimidinones in the presence of $SiO_2-Y(NO_3)_3$ as a green and recyclable catalyst under solvent-free conditions. All products were obtained in high yields and short reaction time. Employing this method is in accord with green chemistry principles.

Estimating the Economic Burden of Premature Mortality Caused by Cancer in Iran: 2006-2010

Karami-Matin, Behzad,Najafi, Farid,Rezaei, Satar,Khosravi, Ardashir,Soofi, Moslem Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.4

Background: Cancer is currently one of the main public health problems all over the world and its economic burden is substantial both for health systems and for society as a whole. To inform priorities for cancer control, we here estimated years of potential life lost (YPLL) and productivity losses due to cancer-related premature mortality in Iran from 2006 to 2010. Materials and Methods: The number of cancer deaths by sex and age groups for top ten leading cancers in Iran were obtained from the Ministry of Health and Medical Education. To estimate the YPLL and the cost of productivity loss due to cancer-related premature mortality, the life expectancy method and the human capital approach were used, respectively. Results: There were 138,228 cancer-related deaths in Iran (without Tehran province) of which 76 % (106,954) were attributable to the top 10 ranked cancers. Some 63 % of total cancer-related deaths were of males. The top 10 ranked cancers resulted in 106,766,942 YPLL in total, 64,171,529 (60 %) in males and 42,595,412 (40%) in females. The estimated YPPLL due to top 10 ranked cancers was 58,581,737 during the period studied of which 32,214,524 (54%) was accounted for in males. The total cost of lost productivity caused by premature deaths because of top 10 cancers was 1.68 billion dollars (US$) from 2006 to 2010, ranging from 251 million dollars in 2006 to 283 million dollars in 2010. Conclusions: This study showed that the economic burden of premature mortality attributable to cancer is significant for Iranian society. The findings provide useful information about the economic impact of cancer for health system policy/decision makers and should facilitate planning of preventive intervention and effective resource allocation.

A Green and Highly Efficient Solvent-free Synthesis of Novel Calicx[4]resorcinarene Derivatives Using Tungstate Sulfuric Acid

Karami, Bahador,Khodabakhshi, Saeed,Safikhani, Niloofar,Arami, Afsaneh Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.1

A facile and simple procedure for the synthesis of novel and known calix[4]resorcinarene derivatives were developed via a reaction of arylaldehydes with resorcinol in the presence of catalytic amounts of tungstate sulfuric acid (TSA) under solvent-free conditions. This eco-friendly method has many appealing attributes, such as excellent yields, short reactions times, use of safe and recoverable catalyst, and simple work-up procedures. TSA was characterized by powdered X-ray diffraction (XRD), X-ray fluorescence (XRF) and FTIR spectroscopy.

Down-Regulation of Mcl-1 by Small Interference RNA Induces Apoptosis and Sensitizes HL-60 Leukemia Cells to Etoposide

Karami, Hadi,Baradaran, Behzad,Esfehani, Ali,Sakhinia, Masoud,Sakhinia, Ebrahim Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.2

Background: Acute myeloid leukemia (AML) is a fatal hematological malignancy which is resistant to a variety of chemotherapy drugs. Myeloid cell leukemia-1 (Mcl-1), a death-inhibiting protein that regulates apoptosis, has been shown to be overexpressed in numerous malignancies. In addition, it has been demonstrated that the expression level of the Mcl-1 gene increases at the time of leukemic relapse following chemotherapy. The aim of this study was to target Mcl-1 by small interference RNA (siRNA) and analyze its effects on survival and chemosensitivity of acute myeloid leukemia cell line HL-60. Materials and Methods: siRNA transfection was performed with a liposome approach. The expression levels of mRNA and protein were measured by real-time quantitative PCR and Western blot analysis, respectively. Trypan blue assays were performed to evaluate tumor cell growth after siRNA transfection. The cytotoxic effects of Mcl-1 siRNA (siMcl-1) and etoposide were determined using MTT assay on their own and in combination. Apoptosis was quantified using a DNA-histone ELISA assay. Results: Transfection with siMcl-1 significantly suppressed the expression of Mcl-1 mRNA and protein in a time-dependent manner, resulting in strong growth inhibition and spontaneous apoptosis. Surprisingly, pretreatment with siMcl-1 synergistically enhanced the cytotoxic effect of etoposide. Furthermore, Mcl-1 down-regulation significantly increased apoptosis sensitivity to etoposide. No significant biological effects were observed with negative control siRNA treatment. Conclusions: Our results suggest that specific suppression of Mcl-1 by siRNA can effectively induce apoptosis and overcome chemoresistance of leukemic cells. Therefore, siMcl-1 may be a potent adjuvant in leukemia chemotherapy.

Common Cancers in Khuzestan Province, South West of Iran, during 2005-2011

Karami, Kh,Cheraghi, M.,Amori, N.,Pedram, M.,Sobhani, A. Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.21

Cancer is the third highest cause of premature mortality in Iran. We aimed to determine trend of common cancers in Khuzestan province, Iran. Methods: It was a hospital based survey on 4065 subjects from their hospital files, those had registered as cancer case in Shafa hospital which has known as a biggest center of cancer in khuzestan province, Iran during 2005-2011.All data has entered by SPSS (version 19), descriptive statistic and adjusted odds ratio of common cancers for age and sex were calculated from multiple logistic regression model. Results: From all subjects; (51% & 49%) were male and female respectively. The most frequent age group was 60-50 years and common cancers were breast 16%, colorectal 6.3%, blood 2%, lung 8% and stomach 8%. Conclusion: Prevalence of cancers has increased markedly with age in Khuzestan Providence. Therefore, it is essential to prevent through early prevention, using screening and identifying cases in initial stages.