saeed karimi

This study aims to analyze Iran's scientific output in the field of intraocular tumors as indexed in the Web of Science (WoS) database from 1993 to 2024. We analyzed Iran’s scientific publications on intraocular tumors indexed in the WoS database between 1993 and February 2024. The extracted variables included the total number of citations each year, average citations per year (from the time of publication), journal name, year of publication, starting and ending pages of the article, issue, volume, and authors’ affiliations. A total of 200 scientific publications were extracted, comprising 115 original articles (57.5%), 40 review articles (20%), 39 case reports (19.5%), five conference abstracts (2.5%), and one letter to the editor (0.5%). The highest number of publications occurred in 2021, while the most citations were recorded in 2022. The majority of articles were published in ophthalmology journals, with "retinoblastoma" being the most frequently used keyword in the extracted publications. Notably, 72% of the articles were authored by researchers affiliated with institutions in Tehran province. Retinoblastoma emerged as the most common keyword in WoS-indexed scientific publications on intraocular tumors by Iranian authors. This trend may be attributed to the availability of treatment modalities beyond enucleation, which have contributed to increased publication activity. Additionally, we recommend the design and execution of multi-center studies on intraocular tumors in Iran to further enhance research in this field.

In this paper, we propose some new preconditioners  for solving multilinear system $\mathcal{A}\mathbf{x}^{m-1}=\mathbf{b}$. These preconditioners are based on tensor splitting. We also present some theorems for analyzing and convergence of the preconditioned  Jacobi-, Gauss-Seidel-, and SOR-type iterative methods. Numerical examples are presented to verify the efficiency of the proposed preconditioned methods.

As socioeconomic inequalities are key factors in access and utilization of type 2 diabetes (T2D) services, the purpose of this scoping review was to identify solutions for decreasing socioeconomic inequalities in T2D.

A scoping review of scientific articles from 2000 and later was conducted using PubMed, Web of Science (WOS), Scopus, Embase, and ProQuest databases. Using the Arksey and O’Malley framework for scoping review, articles were extracted, meticulously read, and thematically analyzed.

A total of 7204 articles were identified from the reviewed databases. After removing duplicate and nonrelevant articles, 117 articles were finally included and analyzed. A number of solutions and passways were extracted from the final articles. Solutions for decreasing socioeconomic inequalities in T2D were categorized into 12 main solutions and 63 passways.

Applying identified solutions in diabetes policies and interventions would be recommended for decreasing socioeconomic inequalities in T2D. Also, the passways could be addressed as entry points to help better implementation of diabetic policies.

Waste management is a crucial aspect of sustainable city development due to the increasing population, urbanization expansion, and changes in consumption patterns. The purpose of this study is to identify the waste landfill in Bushehr city by considering the relationships between various criteria using the DANP (DEMATEL-ANP) method.

17 criteria were identified to identify the suitable landfill. The weighting of these criteria was done by DANP integrated multi-criteria decision-making technique. The internal relationships of the criteria and the causal relationships between the criteria were also determined. Then, these weights were multiplied in the spatial layer of each of the criteria in the environment of geographic information systems.

The most crucial criterion for selecting a suitable location for urban landfill is land use, followed by the criteria of distance from residential areas, tourist places, and the road. The study identified and evaluated five locations in Bushehr city as potential landfills based on these criteria. The eastern and southeastern parts of Bushehr city emerged as the most suitable locations for landfill among the evaluated sites.

The DANP model proves highly effective in identifying landfills and offers a framework for addressing issues related to waste landfill selection. This research can serve as a valuable guide for planning and locating waste landfills, providing a basis for addressing both theoretical and practical challenges associated with landfill management.

Intraocular retinoblastoma (RB) is common in kids. Although the cause of this disease is a mutation in theRB1 gene, the formed cancerous mass in different patients is seen in non-invasive states, limited to the ocular cavityor in invasive states distributed to other parts of the body. Because this tumor's aggressiveness cannot be predictedearly, these patients receive systemic chemotherapy with multiple drugs. Treating non-invasive and invasive tumorsseparately reduces chemical drug side effects. The aim of this study was to identify diagnostic biomarkers by separatingmiRNAs in blood serum from invasive and non-invasive RB patients. In this experimental study, selected three gene expression omnibus (GEO) datasets. Twowere related to serum and tumor tissue miRNAs, and one was related to non-invasive and invasive RB gene expression.Examined RB gene-miRNA relationships. Then, we performed real-time polymerase chain reaction (PCR) on candidatemiRNAs in the Y79 cell line and patient blood samples in non-invasive and invasive retinoblastoma. Fourteen high-expression and 7 low-expression miRNAs resulted. MiR-181, miR-135a, miR-20a, miR-373,and miR-191 were common genes with differential genes between invasive and non-invasive retinoblastoma. OnlyMiR-181 was upregulated in the Y79 RB cell line. Other candidate miRNAs expressed less. Invasive retinoblastomasincreased serum miR-20a and miR-191. Integrated and regular bioinformatics analyses found important miRNAs in patients’ and miR-20a, miR-191, and miR-135a can distinguish non-invasive and invasive retinoblastoma, suggesting further research.

This study aimed to investigate the possible risk factors of central serous chorioretinopathy (CSCR) in an Iranian cohort.

We recruited 39 consecutive CSCR cases and 80 age-matched controls with no ocular pathology from the same medical center from March 2019 to March 2021. Enrolled patients underwent complete ophthalmological examination and extensive history taking in a referral setting. Logistic regression analysis was performed to detect any possible association of potential risk factors with CSCR.

The mean age of CSCR patients was 40.69±7.71 years. The male-to-female ratio in cases and controls was 1:1.79 and 1.22:1, respectively. Logistic regression analysis revealed that alcohol consumption (odds ratio, OR: 62.0, 𝑃 <0.001), smoking (OR: 4.0, 95% CI: 1.47-10.85, 𝑃 <0.006), corticosteroid use (OR: 6.95, 95% CI: 2.64-18.28, 𝑃 <0.001), and high psychological stress (OR: 13.34, 95% CI: 4.68-38.02, 𝑃 <0.01) were significant risk factors for developing CSCR. Ischemic heart disease (𝑃 =0.550), hypertension (𝑃 =0.750), and hyperopia (𝑃 =0.467) were not associated with the risk of CSCR. The most common form of steroid use was oral in both groups. No pregnant female was present in the study sample, precluding the assessment of its potential association with CSCR.

CSCR often affects individuals of productive working ages; thus, identifying its preventable risk factors is highly encouraged. Our results suggested that alcohol consumption, smoking, and high levels of psychological stress are independent, preventable risk factors for CSCR.

The main goal of this research was to evaluate the status of economic indicators in the realization of spatial justice of parks and urban green spaces. The method of current research is based on a valuational-analytical method and the statistical community includes three regions of Bandar Abbas city. Data collection was done in library and field ways. To evaluate the economic indicators in spatial justice, Gini coefficient, the ratio of Gross Domestic Product (GDP) on population, inflation rate and development rate of green spaces were used and the impact of indicators on the spatial justice of parks and green spaces was identified by Eveiws software. The coefficient of determination obtained in the regression model was 0.99 which indicates that the independent variables explain 0.99 variations of the dependent variable. Studied parameters were determined in order of priority: Gini coefficient indicators, the proportion of population onthe GDP and inflation rate. Among them, Gini coefficient has the greatest effect. In other words, the development of high quality parks, both functionally and ecologically in Bandar Abbas city tends to the area in which its population has a lower Gini coefficient. Therefore, considering the influential economic variables and having a comprehensive view, a fair movement in the expansion of the green spaces can be started.

To evaluate the rate of complications in resident‑performed phacoemulsification and influencing factors.

In this retrospective cohort study, the outcomes of cataract surgeries performed by 18 ophthalmology residents were analyzed. The outcome of first 80 phacoemulsification cataract surgeries (1440 cataract surgeries) performed by each resident were analyzed. Outcome measures included the rate of intraoperative capsular rupture requiring anterior vitrectomy, nucleus drop, and incomplete attempts at uncomplicated procedures. Changes in the rate of complications over the surgical training course were also assessed.

The most common surgical complications were capsular rupture (7.5%), followed by incomplete attempt(s) (5.9%), and nucleus drop (1.1%). Comparing the first 40 and second 40 surgeries, the rate of complications decreased as a function of surgeon experience in all resident cohorts. Greater theoretical skills and younger surgeon age were associated with a lower rate of intraoperative capsular rupture (hazard ratios = 1.421 and 1.481, respectively; P = 0.047 and P = 0.041, respectively). The use of antianxiety drugs and number of surgeries in the first 6 months demonstrated no predictive value for a lower rate of intraoperative complications (hazard ratios = 0.929 and 1.002; P = 0.711 and P = 0.745, respectively).

The use of antianxiety medication and more surgeries in the first 6 months did not decrease the rate of intraoperative complications of phacoemulsification, while improvement of theoretical skills may have increased the safety of resident‑performed cataract surgery.

To report a case of Alport syndrome presenting with bilateral giant full-thickness macular holes, hypertensive chorioretinopathy, and exudative retinal detachment.

Case Report: 

A 20 year-old man, a known case of Alport syndrome on hemodialysis, was referred to our clinic with bilateral vision loss initiated about 10 years prior to presentation, which exacerbated in the month prior to our visit. Bilateral large full-thickness macular holes, hypertensive chorioretinopathy, and exudative retinal detachment were detected in fundus examination. The patient had previous genetic counseling confirming the diagnosis of Alport syndrome. During follow-up, macular holes were covered with a thick epiretinal membrane and visual acuity decreased progressively in two weeks. Pars plana vitrectomy was performed in the right eye. Two weeks following surgery, the macular hole was closed and visual acuity improved significantly.

Bilateral giant full-thickness macular holes are uncommon presentations of Alport syndrome. The retinal findings may be caused by an inefficient type IV collagen presenting in the Bruch’s membrane and in the internal limiting membrane. Pars plana vitrectomy can be considered to repair macular holes in these patients.

To assess the added risk of acute endophthalmitis after intravitreal injections associated with the widespread use of face masks during the COVID-19 pandemic.

In this retrospective, single-center study, records of patients with acute endophthalmitis following intravitreal bevacizumab (IVB) injections during the pre-COVID era—that is, March 1st , 2013 to October 31st, 2019 —and the COVID-19 era—that is, March 1st, 2020 to April 1st, 2021 —were reviewed and compared.

A total of 28,085 IVB injections were performed during the pre-COVID era; nine eyes of nine patients developed acute post-IVB endophthalmitis in this era, giving an overall incidence of 0.032% (3.2 in 10,000 injections). In the COVID era, 10,717 IVB injections were performed; four eyes of four patients developed acute post-IVB endophthalmitis in this era, giving an overall incidence of 0.037% (3.7 in 10,000 injections). The incidences of post-IVB endophthalmitis during these two eras were not statistically significantly different (P = 0.779).

Face masking protocols seem unlikely to impose any additional risk of post-IVB endophthalmitis.

Helicopter Emergency Medical Services (HEMS) provide medical care to critically ill patients and the injured immediately and provide faster treatment, thereby reducing the length of hospitalization. This study aimed to identify the policy implications of HEMS in Isfahan province.

This qualitative study was conducted using the thematic analysis method. The study population included the managers, personnel, and flight crews of Isfahan HEMS. The participants were selected using the purposive sampling method, followed by the snowball method. Initially, 14 individuals from the HEMS personnel were interviewed using the interview guide form, and then, the opinions of 15 participants from the flight crews were collected through an open questionnaire. Maxqda10 software was used for data coding.

The research findings were classified into challenges, opportunities, and implications. In terms of challenges, 11 themes and 34 categories were identified in this study.  HEMS opportunities were also divided into 8 themes and 11 categories. The policy implications provided by the participants were also categorized into 8 themes and 28 categories.

Considering that one of the most important known challenges was the lack of specialized helicopters and medicopters, according to the results, it is suggested that the managers of Isfahan HEMS take measures to solve the existing challenges and develop plans to strengthen the capacities and utilize the opportunities.

Tehran has experienced extensive population growth in the last decades, leading to a high rate of urban expansion. Land use/land cover (LULC) patterns have noticeably been changed to impervious surfaces that led to the changes in the thermal condition and forming heat islands in this city. So this study wants to evaluate the landscape and the Land surface temperature patterns via using the landscape metrics on a proper scale in Tehran.

 In this study, a combination of remote sensing, GIS and landscape ecology approach is used to explain the relationship between land use/cover patterns and land surface temperature in Tehran's urban area. We used ETM + Landsat satellite images of February 28, 2013 to create a five class LULC map of the area through Linear Spectral Mixture Analysis and the maximum algorithm methods.Also, Land Surface Temperature map were prepared according to the available methods for thermal band of the sensor and were presented in four zones. Then, the relationship between LST and land use/cover was investigated using 7 landscape metrics (e.g MPS, PAFRAC, COHESION).

We found that impervious surface has the highest percentage of class and mean patch size, cohesion and aggregation, and landscape metrics very well described the LST zone II with impervious surface dominance. Also, the results showed that the 30 m pixel size is good enough for assessing the spatial and ecological characteristics of LULC patterns and their relationships with LST in Tehran

The results showed the possibility of assessing the relationship between LST and LULC based on the landscape metrics. The findings can be useful for urban planners and environmental managers to decrease urban heat pollution during urban sprawl and development.

As the most common congenital heart malformation, tetralogy of Fallot (TOF) produces cyanosis. Patients with TOF suffer from a higher frequency of major noncardiac congenital disorders. Its association with congenital scoliosis influences vital and functional overcomes, restricting physical activity and lowering life expectancy. An 8-month-old female child was reported with admitted cough, fever, and ruled-out pneumonia. The child was diagnosed with heart disease at 2-month-old when cyanosis was apparent. After being admitted to a hospital, history and physical examination showed mild neurodevelopmental delays, such as an inability in rolling and crawling. Her chest x-rays revealed congenital spine abnormalities thoracic vertebral at T3-T8 levels and bilateral segmented-bar sacral vertebrae. Given that patients with TOF routinely undergo chest radiographs, physicians examining TOF patients’ chest radiographs should be aware of the potential for congenital scoliosis to provide early diagnosis and referral for orthopedic evaluation and treatment.

The public health system is currently facing a shortage of resources, and the demand for healthcare has increased, indicating the need to use the capacities of other sectors through public-private partnership (PPP) strategies to improve the quantity and quality of health services.

The purpose is to identify PPPs’ role in providing primary healthcare worldwide.

This study was conducted in 2020. The Arksey O’Malley framework was used, along with a systematic literature search on five databases, including Web of Science (ISI), Scopus, Pubmed, ProQuest, and Google Scholar. Data were gathered from 2000 to 2020.

The findings presented in this study are reported based on 16 selected studies. The findings point to the positive impacts of cooperation between the public and private sectors in health care systems on matters of provision, coverage, and performance of services, as well as improvements in responsiveness to providers towards enhancing health referral systems. The provision of participatory services in countries varied according to their level of development, and further interactions between the government and the private sector resulted in better coverage and reduced inequality in service delivery.

Public-private partnership is an effective way to achieve sustainable development goals. Public-private partnerships can be strengthened by integrating public and private sector facilities and aligning the interests and motivations of service providers with public health goals. Also, awareness of the plans and capacity of public and private sectors, along with conscious and mutual interaction, can strengthen health on a larger scale. Scientific approaches and correct participation can also relieve the part of governmental responsibilities to focus on more primary measures so that it can carry out its core tasks, including stewardship, policy-making, and supervision, with greater focus and power to facilitate the achievement of goals.

To evaluate the therapeutic response of retinal vein occlusion (RVO) to intravitreal bevacizumab (IVB) with and without concomitant vitamin D supplementation.

Seventy eyes of 68 patients with macular edema associated with branch retinal vein occlusion (BRVO) and central retinal vein occlusion (CRVO) received three monthly IVB injections. Patients with serum 25-hydroxyvitamin D (25(OH) D) higher than 30 ng/ml were considered as the sufficient group. Cases with serum 25(OH) D levels below 30 ng/ml were randomized into the treatment and control groups. The control group received 50,000 IU of oral vitamin D, weekly for two months. One month after the last IVB injection, best-corrected visual acuity (BCVA) and central macular thickness (CMT) were measured and compared with the preinjection values.

While 43 eyes (61.4%) of 42 patients had BRVO, 27 eyes (38.6%) of 26 patients had CRVO. In BRVO patients, changes of CMT and BCVA were not significantly different between the sufficient, control, and treatment groups (P = 0.58 and 0.64, respectively). In the CRVO group, CMT reduction in the control group was significantly less than the sufficient and treatment groups (P = 0.048). In addition, improvement of BCVA in the control group was significantly less (P = 0.036) than the sufficient and treatment groups.

Oral vitamin D supplement therapy may improve anatomical and functional outcomes in patients with CRVO and vitamin D deficiency.

Despite the fact that medical equipment is critical for providing good health services and also incurs significant expenditures for the health system, little is known about how to procure it effectively. To date, only a few comparative studies on the procurement framework for medical equipment between nations have been conducted. Thus, the purpose of this study was to examine this issue between the leading countries.  

To conduct this comparative study, Canada, the United Kingdom, Australia, Spain, Italy, Turkey, Thailand, and Iran were selected. Medical devices, medical equipment, procurement, purchasing, and acquisition were keywords considered to search PubMed, ProQuest, Web of Science, Scopus, Science Direct, and Google scholar databases. Also, the websites of the related organizations, such as the World Health Organization (WHO), the World Bank, and the Ministry of Health of respective countries were searched for the gray literature. Providing information about the procurement framework and availability of evidence in the English language was considered as the inclusion criteria and the lack of access to full texts, letters, and commentary article designs were the exclusion criteria. The results were summarized and reported using comparative tables.  

Most of the countries involved in this study are trying to align procurement activities with national health care priorities. In view of this, there is a trend toward centralized procurement, especially in Italy, Spain, England, Italy, Canada, and Iran. While a range of actors participate in the procurement process, a greater role for physicians and patients is necessary to be defined to meet patient needs. Moving from price-based approaches to value-based approaches is in the agenda to consider a broader range of criteria to achieve value for money and support patient access to innovations.  

Most of the countries have reorganized the mechanism of medical equipment procurement. The price of products is the important factor, and recently the value factor has become more important in procurement. Reinforcing the role of decision-making teams and hospital committees in the procurement of medical equipment is suggested. Further studies are needed on the application of value-based approaches to evaluate their effects in hospitals.

Most critical accidents in different industries are observable, but their severity is also predictable and can be controlled. Provided that accident analysis is properly managed with a preventive approach and based on correct findings, in a principled and realistic manner, root causes, corrective actions, and safety measures regarding accidents are performed.

The present research was a descriptive-analytic study, and the reported and recorded fatal occupational accidents were analyzed in the onshore section of one of the construction refinery projects in the South Pars Gas Refinery over a decade using the Tripod Beta method and then main risk factors, pre-conditions, and underlying causes, as well as the existing protective barriers, were identified, and an accidents tree was drawn.

The analysis of fatal occupational accidents showed that 26 immediate causes, 39 preconditions, and 50 underlying causes were involved in those accidents. Six key risk factors include lack of responsibility/organizational impact (57.8%), training (22.2%), hardware or tools and equipment (6.7%), maintenance management (6.7%), work procedures (4.4%), and Error Enforcing conditions (2.2%) had the largest share of the occurrence of accidents.

More than 80% of fatal occupational accidents can be controlled by modifying the two main factors, responsibility and organization and training. Therefore, implementing the total productive maintenance method, effective monitoring of staff work, hiring staff with sufficient knowledge and skills, and improving training indicators will increase understanding of hazard sources, improve safety and reduce accidents.

As one of the methods of Severe Plastic Deformation (SPD), the Accumulative Roll-Bonding (ARB) process leads to the production of high-strength metal sheets and fine-grained structures. In this paper, the Single Point Incremental Forming (SPIF) of Al 1050 sheets, processed by the ARB and CARB (Cross-Accumulative Roll-Bonding), is experimentally and numerically investigated. The forming force, thickness distribution, and forming depth in both cases (ARB and CARB) are all determined in this research. The result shows that the formability of CARB samples is higher than ARB samples. Furthermore, the formability of both ARB and Al 1050 annealed samples are equal in the initial pass. In addition, the samples’ strain is enhanced by increasing the number of rolling passes, and as a result, the formability scales down. The results obtained using the dynamometer reveals that the vertical forming force extent in the CARB samples is higher than in the rest of the samples.

Medical equipment plays an important role in the diagnosis, treatment, and medical education, and each year the major share of hospital costs (about 5%–15% annually) is allocated to the purchase of medical equipment. The selection and allocation of medical equipment should be appropriate and in line with the actual needs of the medical centers, clinical goals, human resources, and the conditions required to ensure safety. The purpose of this study was to study and evaluate current systems of medical equipment management and identify their strengths and weaknesses in Isfahan educational hospitals in 2018.

This is a descriptive‑applied research that was done in a cross‑sectional way in 2018. The statistical population of the research is the authorities of medical equipment and other persons related to the management of medical equipment of selected educational hospitals in Isfahan. The data collection tool is a questionnaire.

The result of this study was gathered in four areas: medical equipment management, safety, preventive maintenance, and training.

According to this study, there is no comprehensive program in hospitals for how to manage medical equipment, which itself causes the loss of material and equipment capital of the organization. In most cases, the lack of a system for planning and controlling the amount of inventory and purchasing and maintaining medical equipment creates many problems, such as the accumulation and depreciation of equipment or the lack of these facilities in critical situations. In this study, it is suggested initially a scientific control system. Medical equipment is designed so that the hospital’s need for equipment at any time of year and the amount of its equipment are clear so that it can be easily decided in this field.

Power plants have pollution of water, air, soil, and their voice and considerable damages to the surrounding environment enters. But also with the growth of population and industry,.... the demand for energy, especially electricity consumption has been growing in recent years But also with the growth of population and industry, the demand for energy, especially electricity consumption has been growing in recent years And the fact that the electrical energy supply required is often require build new stations and treatment plants social consequences, economic, political, environmental and many.

This paper identifies important factors in determining a suitable location for the construction of gas power plant in the province of Gilan, and the effectiveness of each of these factors, by using fuzzy and Boolean and software to GIS, integrating layers spatial data do and potential locations for the construction of gas power plants were identified.

The results showed With regard to the integration of different data layers and limitations, about 90 percent of Gilan province as a constraint areas were determined for power plant   And the other 10 percent, 5 percent favorable weight and 5 percent is weight the semi- favorable and unfavorable.

Finally, Compared with five operator fuzzy model, fuzzy Product function better than it looked.

Common variable immunodeficiency (CVID), is generally recognized as the most frequent type of Symptomatic primary immunodeficiencies (PID). Mutations in lipopolysaccharide-responsive beige-like anchor protein (LRBA) gene, are the most common genetic alterations amongst CVID patients. To date, there are no published studies to compare clinical and immunologic features of LRBA-deficient patients with those who do not harbor any known genetic mutations. Therefore, this study aims to compare the clinical manifestations and laboratory findings of Iranian patients with LRBA-deficiency and CVID with no known genetic alterations.

We performed a longitudinal study on patients who had been diagnosed with CVID. Demographic and clinical features were obtained via the databank of the Iranian Registry of Primary Immunodeficiencies, and the direct interviews with patients. To assess the presence of LRBA or other genetic mutations, whole-exome sequencing (WES) was used. Immunologic characteristics of patients were evaluated using flow cytometry, nephelometry, and conventional blood counts. The current study is conducted at Tehran’s Children Medical Center and is approved by the ethics committee of Tehran University of Medical Sciences.

Between March 2013 and October 2019, we enrolled 30 patients with LRBA-deficiency and 13 patients with CVID, who had no identified genetic mutations. Regarding clinical features, there were no significant differences for the prevalence of infections at different sites (lung, sinuses, and middle ear) among the two groups (all P > 0.05). However, the incidences of autoimmune disorders and enteropathy were significantly higher among LRBA-deficient cases (P < 0.001). In serum levels of immunoglobulins, there were significant differences for IgG and IgM between the two groups (P of 0.014 and 0.004, respectively); however, this was not seen for IgA and IgE levels. Likewise, we did not see any significant differences for the cluster of differentiation (CD) markers between the two groups (all P > 0.05).

Compared to the CVID patients with no identified genetic mutations, LRBA-deficient patients have a significantly greater chance of parental consanguinity and developing autoimmune disorders and enteropathy, and have significantly higher values of serum IgG and IgM. The rate of infectious complications and other basic laboratory features, do not show significant differences between the two groups.

Flood is one of the most complex and destructive natural events that endangers social, economic and environmental conditions more than any other natural disaster. Due to the existence of suitable conditions in the areas adjacent to the rivers, most economic activities are carried out in these areas and due to the role of habitat destruction in the extinction of plant and animal species, it is necessary to study flooding and Preparation of flood zoning maps of the mentioned areas should be given priority. In this research, to achieve this goal, nine natural and human factors including: altitude, distance from waterway, drainage network density, slope, land use, land shape, vegetation density, geology and rainfall have been used. Each of the factors, by their nature, is fuzzy in the flood zoning potential zoning model and is used. By forming pairwise comparison matrices, the normal and final weight of each factor was obtained. Using ArcGIS software, each fuzzy layer was multiplied by its relative weight, and finally the weighted fuzzy layers were stacked using the Gamma operator, and the final map was obtained. The final flood zonation map of Babolrood watershed showed that in total about 44% of the basin area is in the moderate to very high risk zone. There is also the highest risk of floods in the southwestern parts of the basin, which have high altitudes and heavy rainfall.

A fast and efficient Newton-Shultz-type iterative method  is presented to compute the inverse of an invertible tensor. Analysis of the convergence error shows that the proposed method has the sixth order convergence. It is shown that the proposed algorithm can be used for finding the Moore-Penrose inverse of tensors. Computational complexities of the algorithm is presented to support the theoretical aspects of the paper. Using the  new method, we obtain a new preconditioner to solve the multilinear  system $mathcal{A}ast_Nmathcal{X}=mathcal{B}$. The effectiveness and accuracy  of this method are re-verified by several numerical examples. Finally, some conclusions are given.

Despite this seemingly simple definition of value in different perspectives, the definition of value-based procurement for medical devices is still unclear. This study aimed to delineate the definition of value-based procurement for medical devices and its characteristics.

According to the systematic method for scoping review described by Arksey and O’Malley, we reviewed related literature through target databases (PUBMED, ProQuest, Web of Science, Scopus, and Science Direct) during 2004-2020. The publications that focused on the procurement of medical devices and address the issue of value in procurement were selected. The publications whose full-text was not available and were not in English were excluded. By using data charting tables, selected articles were reviewed and concepts and definitions were extracted

According to the eligibility criteria and reference checking, 24 documents were selected. There are different definition and understanding for value-based procurement (VBP). Identified characteristics of VBP are information, actors Collaboration, patient experience, value analysis team, ability to evaluate alternatives, value proposition, competitive dialogue, and weighing evaluation criteria.

VBP is a framework that guides the review and decision-making to procure medical devices. In this framework, all dimensions of the value equation (outcome/related costs) must be considered and weighted. Health systems need to work on identified aspects.