Brucellosis is one of the most important zoonotic diseases which is endemic in Iran. This disease is considered a significant hazard to citizens’ health and imposes heavy economic burdens, hence, ...requires a thorough control and management plan. The aims of this study are identifying the areas having the highest risk of brucellosis, as well as discovering the contributing environmental factors. The maximum entropy (MaxEnt) method was used to model the probability of brucellosis in Golestan, Mazandaran, and Guilan provinces. The possible contribution of 12 environmental parameters in this disease was also measured using the Jackknife method. The results showed that the highest risk of brucellosis is located in southern Golestan, East, and West of Mazandaran, and south of Guilan province, and moisture, slope, vegetation and elevation are the most effective environmental factors on the spatial distribution of the disease. In addition, the probability of the disease in northern Iran increases from west to east. These findings could assist the public health managers and decision-makers in organizing a more efficient public health system.
Nowadays, in many countries, human resources is being used as a source of property by many social an economical organizations in order to enhance the level of their operation. Investors and other ...related groups in order to make better decisions need to use some expressions related to the value of human resources. Using human resource accounting organizations seeking to improve the efficiency and effectiveness of human resource management and human resources. The main objective of this paper is to evaluate the effect of accounting, human resources managers in decision-making and behavior of employees in the company's stock. This cross-sectional study with a survey approach and applied research are considered. The population of the study in 1394 are some of the companies stock. The results showed accounting, human resources component of research and finally decided Miran is also significant effect.
A multiscale modeling and simulation approach, including first-principles calculations, ab initio molecular dynamics simulations, and a tight binding approach, is employed to study band flattening of ...the electronic band structure of oxidized monolayer graphene. The width of flat bands can be tuned by strain, the external electric field, and the density of functional groups and their distribution. A transition to a conducting state is found for monolayer graphene with impurities when it is subjected to an electric field of ∼1.0 V/Å. Several parallel impurity-induced flat bands appear in the low-energy spectrum of monolayer graphene when the number of epoxy groups is changed. The width of the flat band decreases with an increase in tensile strain but is independent of the electric field strength. Here an alternative and easy route for obtaining band flattening in thermodynamically stable functionalized monolayer graphene is introduced. Our work discloses a new avenue for research on band flattening in monolayer graphene.
Spectrophotometric examinations showed the presence of phenolic compounds in the organic residue collected from four groundwater resources located in vicinity of an oil refinery at the outskirt of ...Tehran. The average concentration of total phenolic compounds was about 0.38 mg.L-1 in these samples using Folin-Ciocalteu method. GC-Mass analysis disclosed that alkylphenols were the major phenolic contaminants in the samples. Evaluation of the Advanced Oxidation Processes (AOPs) efficacy for removal of alkylphenols from real water samples is a hot topic of recent Environmental Research due to the decomposition of these compounds in soil and by microorganisms which may results in the formation of structures more resistance against various types of oxidation. To explore the efficacy of AOPs for removal of alkylphenols from the examined groundwater resources, the optimal conditions for three important AOP including Fe2+/H2O2/UV (Photo-Fenton), O3/UV and O3/UV/H2O2 were first sought using a recalcitrant lab sample containing different aromatic compounds with total concentration of 2 mg L^-1. Consequently, two methods of O3/UV (2 mg L-1 O3, 15 min UVC), and O3/UV/H2O2 (2 mg L^-1 O3, 5000 mg L^-1 H2O2, 15 min UVC) were selected to be examined on the real samples. Although the selected methods were quantitatively effective on the lab sample, they resulted in average removal efficiencies of 79.71% and 84.16% on the real samples, respectively. With respect to the safety regulations, costs and easiness of implementation, the O3/UV method seems to be more promising for large-scale plans.
Spectrophotometric examinations showed the presence of phenolic compounds in the organic residue collected from four groundwater resources located in vicinity of an oil refinery at the outskirt of ...Tehran. The average concentration of total phenolic compounds was about 0.38 mg.L-1 in these samples using Folin-Ciocalteu method. GC-Mass analysis disclosed that alkylphenols were the major phenolic contaminants in the samples. Evaluation of the Advanced Oxidation Processes (AOPs) efficacy for removal of alkylphenols from real water samples is a hot topic of recent Environmental Research due to the decomposition of these compounds in soil and by microorganisms which may results in the formation of structures more resistance against various types of oxidation. To explore the efficacy of AOPs for removal of alkylphenols from the examined groundwater resources, the optimal conditions for three important AOP including Fe2+/H2O2/UV (Photo-Fenton), O3/UV and O3/UV/H2O2 were first sought using a recalcitrant lab sample containing different aromatic compounds with total concentration of 2 mg.L-1. Consequently, two methods of O3/UV (2 mg.L-1 O3, 15 min UVC), and O3/UV/H2O2 (2 mg.L-1 O3, 5000 mg.L-1 H2O2, 15 min UVC) were selected to be examined on the real samples. Although the selected methods were quantitatively effective on the lab sample, they resulted in average removal efficiencies of 79.71% and 84.16% on the real samples, respectively. With respect to the safety regulations, costs and easiness of implementation, the O3/UV method seems to be more promising for large-scale plans.
A new device for fretting fatigue testing Majzoobi, G. H.; Hojjati, R.; Nematian, M. ...
Transactions of the Indian Institute of Metals,
04/2010, Volume:
63, Issue:
2-3
Journal Article
Open access
Fretting fatigue damage occurs in contacting parts when they are subjected to fluctuating loads and sliding movements at the same time. Fretting fatigue can reduce the fatigue life of materials by ...half or even more. Fretting fatigue tests are usually performed using universal hydraulic testing devices. The contact pressure is produced by a fixture, typically designed and manufactured by researchers. In this investigation, a new device is introduced in which the fluctuating loading is supplied by a variable crank system (VCSD). The device called VCSD for abbreviation is basically a position control machine in which displacements can be imposed with an accuracy of 0.01 mm. The axial and contact loads are measured by load cells. The friction load is also measured by using foil strain gauges using a Wheatstone bridge configuration. The functionality of the device is examined by making a comparison between fretting fatigue lives of a number of Al7075-T6 specimens tested on a universal testing machine and VCSD. The results show a very close agreement between the functionality of the two testing rigs. The main advantages of VCSD are its higher frequency with respect to universal devices, simplicity, and cheapness. It can be developed further for high and low temperature tests in future.
In this study, we determined and evaluated the correlation between the dose of Valproate (VPA) and the concentrations of VPA and two important metabolites (2-ene-VPA and 4-ene-VPA) in serum of ...intoxicated patients referred to Loghman hospital. VPA poisoning is an increasing clinical problem. 2-ene-VPA is neurotoxic and the 4-ene-VPA has a key role in hepatotoxicity of VPA. Following clinical evaluations, two blood samples at referring time (time zero) and 12 h later were collected from 19 intoxicated patients. VPA and its metabolites were extracted from serum samples and measured using Gas chromatography-mass (GC-MS) spectrometry analysis. There was a correlation between VPA dose and concentration of VPA in serum of intoxicated cases at referring time (p<0.01). Significant reduction between mean serum concentration of VPA and metabolites was observed after 12 h (For VPA p<0.05, for 2-ene-VPA and 4-ene-VPA p<0.01). Evaluation of serum levels of VPA metabolites can provide information about potential risk of side effects and better management of patients.
The Chapdoni-Posht-e-Badam complex is located in the Central Iranian structural zone and the northeast of Yazd province. This complex is one of the areas with high potential for thorium-rare earth ...elements mineralization in Central Iran. In this research, the network modeling method has been used to determine the type and potential of Th-REE mineralization in the study area. Different methods such as geochemistry, geophysics, remote sensing, field observations, and laboratory works have been used, and different criteria have been considered for scoring. After applying the mentioned methods, creating a database, and combining multiple layers, the mineralization model or possible deposit types have been determined. This research uses a network method to integrate different data layers and model them to produce a mineralization potential map. The results obtained for different types of mineralization models were combined in the form of final modeling, and a comprehensive map of mineralization potential was prepared. Finally, mineralization types related to granite, metasomatism, and metamorphism were determined for thorium and rare earth elements in the Chapdoni-Posht-e-Badam complex. The mineralization potential of thorium-rare earth elements in the center and south of the study area is more than in other places.
"Water shortage" and "air pollution" are two environmental crises threatening Tehran metropolis, and have caused lots of problems for the citizens. The question is which organization is responsible ...to investigate these issues? Is it the Environment Protection Agency, the mass media, or the cognitive linguistics? It seems none of them can resolve the problem by themselves, and the interdisciplinary studies are needed in order to analyze the crises from different point of views. So, during this article, we attempted to describe and analyze those visual Images in Hamshahri newspaper (2015) that their main concern was environmental crises. The main question of our study was: "How do the visual images help to reduce the environmental crises using the pictorial metaphors approach (Forceville, 2016)?" The main assumption of the approach was "if there is not any major contrast between the main elements of the approach and the main elements of the visual images in the Hamshahri newspaper, the visual images of the newspaper will have the capability of being received by the readers". In this case, the designers of the visual images will accomplish their goals -reducing the environmental crises. If not, it is necessary some fundamental changes to be done. The study was descriptive- analytic, and most times its results were in line with Forceville (2016). In general, it was concluded that the pictorial metaphors in Hamshahri newspaper had the capability of being understood by the readers. So, the designers accomplished their main goal - reducing the environmental crises.
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