Design, construction and evaluation of shear vane device for biomass yield stress determination

Abstarct Agglomerate followed by pelleting is one of the efficient methods to decrease transport costs and increase economic efficiency of biomass material. Understanding the rheological properties of biomass is necessary for pelleting process optimization as well as the design of devices with enough energy and pressure to determine the effect of different variables on the density and durability of pellets. The rheological properties of extruded material is depended to properties and moisture content of the raw material, used for extrusion. Therefore, in this study a shear vane was developed to determine the rheological properties of biomass materials. The output rotation of the electromotor was measured by a rotary encoder and the forces to the vane blades, inserted by the material, were measured by a bending loadcell. The experiments were done at moisture content levels of 35, 40 and 45%, and rotational speed of the shear vane container at three levels of 0.1, 0.2 and 0.3 rpm. The results showed that the higher maximum torque was achieved at 35% moisture content and rotational speed of 0.1 rpm. The lowest maximum torque was found at 35% moisture content and rotational speed of 0.2 rpm. The maximum shear stress and yield stress were obtained at 35% moisture content and rotational speed of 0.1 rpm while the minimum shear stress and yield stress were found at 35% moisture content and rotational speed of 0.2 rpm

Effect of educational intervention on self-efficacy for choosing delivery method among pregnant women in 2013

Methods: This quasi-experimental study was conducted on 130 pregnant women who attended urban health centers in Shahrekord city in 2013. Intervention was applied in the experimental group in three sessions in about 60-90 min while control group did not receive any intervention. Fear of childbirth and self-efficacy questionnaire was completed before and after training. Results: While mean scores of the fear of childbirth, expectations and childbirth self-efficacy before the intervention between the two groups were not significantly different (P > 0.05), mean scores of childbirth in intervention group was reduced and expectation and childbirth self-efficacy had a significant increase after intervention (P 0.05) and self-efficacy (P < 0.001) than those who chose normal method. Conclusions: Our findings showed that training-based self-efficacy procedure has been effective in encouraging mothers to choose natural childbirth. Therefore, the design and implementation of curriculum-based strategies for increasing self-efficacy is suggested for pregnant women. Background: Nowadays, there has been a growing trend of caesarean sections in Iran. One reason would be the mother’s desire. Increased maternal self-efficacy can be an important step to reduce percentage of cesarean. This study aimed to determine the effectiveness of training-based strategies to increase the self-efficacy for choosing delivery method among pregnant women in Shahrekord city. © 2014, Isfahan University of Medical Sciences(IUMS). All rights reserved

Effectiveness of Self-Help Mindfulness on Depression, Anxiety and Stress

Introduction: Growing evidence shows that mindfulness based on self-help interventions have advantages for physical and psychological health in different populations. The mindfulness based emotional balance is a new program and efficacy of which has not been investigated in self-help format.  Methods: This study was a randomized control trial (RCT) with wait-list control. After screening and applying inclusion and exclusion criteria eighty students of Kermanshah University of medical sciences were assigned randomly to the mindfulness-based emotional balance self-help or the wait list control group. Anxiety, depression, stress, and mindfulness were measured prior to the intervention after the intervention, and two-month after end of intervention as follow-up. DASS-21 and MAAS were used.  Results: Significant decrease in anxiety, depression, and stress in addition to a significant increase in mindfulness in the experimental group in the posttest. However, there were no significant changes in any of the aforesaid measures in the wait list control group. The resultant benefits were persistent in the two-month follow-up. Conclusion: Based on the results of this study, this type of treatment can be used as an efficient and cost-effective method to improve psychological problems such as stress, depression and anxiety.  Declaration of Interest: Non

History of treated pulmonary tuberculosis will also be an underlying symptom of opportunistic aspergillosis by Aspergillus flavus: A case report

AbstractIntroductionAspergillus species as cosmopolitan fungi with remarkable virulence factors were found to be agents of pulmonary aspergillosis in patients with impaired immunity. The formed cavity of some previously treated lung diseases, such as tuberculosis, sarcoidosis and pneumoconiosis, is usually predisposed to the development of aspergillosis.Pulmonary aspergillosis (PA) is an uncommon disease which is characterized by hemoptysis, malaise, fever, cough, weight loss and nonspecific radiographic manifestations, including an oval or round mass with a radiolucent halo or crescent of air, a focal consolidation, and cavitary lesions.Case presentationThis study presents the case of a 54-year-old woman with dyspnea alongside a history of treated pulmonary tuberculosis (PTB) by ATT 2years ago. X-ray confirmed the presence of a rounded mass in a surrounding cavity in the lung. Tracheobronchial and chest CT images of the patient showed cavities with tuberculous nodules. Clinical symptoms of the patient were fever, malaise, anorexia, weight loss, chest pain, cough and dark mucus sputum. Aspergillus sp. was detected primarily as branching hyaline hyphae in direct examination of the sputum by calcofluor-white staining. The sample was positive with culture as well. Aspergillus flavus was identified in culture and confirmed by polymerase chain reaction (PCR) and sequencing of the ITS region of rDNA and β-tubulin of fungus. The patient signed an agreement for reporting her case as a medical document in journals or in conferences.ConclusionThe importance of tuberculosis (TB) in the development of aspergillosis, even after treatment, has been highlighted by multiple studies. Microbiological and molecular evaluation are needed to detect PA quickly and accurately. The WHO reported about 8.8million new cases of TB in 2010. Therefore, it is essential to focus more on monitoring of diagnosis and treatment of PA

Historical References in the Poetry of Prominent Hilla Poets

يميط هذا البحث اللثام عن تجربة الشعراء، وكيفية تخصيب مرجعياتهم التاريخية على اختلاف ألوانها ونمطها وقضاياها، وهو ما نصبوا إليه في هذه الدراسة الخاصة بنصوص أبرز الشعراء الحليين، وكيفية أدلجة لغتهِم مع المرجعيات التاريخية، بالتعامل مع الأمثال القديمة، بالإضافة إلى العبارات التاريخية، مما مكنهم أن يكونَوا فرسانا في هذا المجال، وقد كان المنهج التحليلي هو النهج المتبع في تحليل وتفسير النصوص المختارة، كونها أخذت تحتل مكانة مهمة في موضوعات الأدب، وصارت موضوعاتها تستهوي عددا من الباحثين الذين تأثروا بها.This research will reveal the experience of the poets, and how to enrich their historical references of different colors, style and issues, which is what they aimed at in this study of the texts of the most prominent poets, and how to ideological their language with historical references, by dealing with ancient proverbs, in addition to phrases history, which enabled them to be a mare in this field The analytical method was the approach followed in analyzing and interpreting the selected texts, as it took an important place in literature topics, and its topics became attractive to a number of researchers who were influenced by it

A Thorough Review of Sand Dunes in Iran and Their Relationship to Certain Climatic Features

IntroductionSand covers around 20% of the world's drylands, and 97% of it is found in the sandy land of the arid region of the earth. Different landforms are created by the wind in these regions. Sand dunes are a landform that is mentioned in arid lands. Knowing the distribution of sand in these areas is crucial because wind erosion can cause a lot of damage. The significance of studying sand dunes lies in its impact on water and soil resources, plants and animals, human infrastructure, and roads. In Iran, various researchers and related organizations have reported various areas of the sand dunes. Different tools and methods have been utilized by these researchers, including aerial photos, topographic maps, satellite images, and field visits. This study was conducted to improve accuracy and update the existing maps due to the differences between the maps provided by previous researchers. By providing a new map of sand dunes distribution in Iran, more precise information can be obtained. Precipitation, temperature, evapotranspiration, and UNEP aridity index were used to calculate climate characteristics for Iran's sand dunes. Material and MethodsRemote sensing was used to export the sand dunes distribution map in this research using the Google earth engine system. The image collection of the OLI sensor of the Landsat 8 satellite was used. The process of image classification involved introducing 4000 points as training points. The land use map of Iran was exported after verifying and calculating the overall accuracy and kappa coefficient, which were 0.91 and 0.89, respectively. The map's sand dune class was imported into ArcMap. The maps of the distribution of sand dunes obtained from previous researchers were compared with the obtained map. The boundary of sand dunes was modified by drawing 1020 polygons using vision recognition. We aim was always to utilize the most up-to-date satellite images for visual interpretation. Due to differences in tools and study time, and the prepared maps based on different criteria, there are numerous differences between the maps in practice. The research utilized up-to-date satellite images and geological maps, topography, hand-planted forests, residential lands, agricultural lands, and land use as auxiliary maps. In the next step, the long-term climate maps prepared by Jamab's consulting engineers for the period of 1350 to 1390 were used to investigate climate characteristics such as temperature, precipitation, evaporation and transpiration and UNEP aridity index. The mentioned maps were interpolated and classified in ArcMap for this purpose. The distribution of the country's sand dunes was examined in each of the categories mentioned in the climatic indicators. Results and DiscussionBased on the result, the updated area of Iran's sand dunes is 5.15 mha which includes the sand sheets and different forms of sand dunes such as barchans, star dunes and nebkas. Based on this, the provinces of Kerman, Sistan and Baluchistan, Isfahan, South Khorasan and Yazd respectively, with an area of about 1000000, 700000 and 590000 ha, have allocated the largest area of sand dunes in the country. There are some differences in the obtained results compared to the previous maps of sand dunes. In Dehlran city in Ilam province, some regions that were previously considered sand dunes have now become agricultural lands, for instance. The border modification resulted in a 366% increase in the area of Qaen city in South Khorasan province. According to climate data, sand dunes are distributed in three climates that are hyper- arid, arid, and semi-arid. The highest and lowest amount of precipitation can be found in Farashband city in Fars province and Hirmand city in Sistan and Baluchestan Province, respectively. The range of precipitation changes is ranging from 6 to 312 mm.  The hottest sand dunes are located in Shahrud city in Semnan province and the coldest sand dunes are located in Buin Zahra city in Qazvin Province. The temperature of sand dunes is in the ranges of 10 to 28.5 °C. the dominant thermal regime of sand dunes is thermic, which covers about 68% of the sand dunes in 8 provinces. Hyperthermic thermal regime dominates 31% of sand dunes in 7 provinces. Only about 1% of sand dunes have mesic thermal regime which are scattered in 3 provinces. The range of changes in evapotranspiration in the sand dunes of Iran is between 1500 to 4000 mm per year. Evaluating the UNEP aridity index showed that 89% of the sand seas are classified as hyper arid and 11% of them is in arid class. The result of this research by determining the location of sand seas and their climate classification, will help the administrators to locate appropriate areas for reclamation and wind erosion control projects, especially the biological project

Propane-1,2-diaminium bis­(pyridine-2,6-dicarboxyl­ato-κ3 O 2,N,O 6)mercurate(II) dihydrate

In the title compound, (C3H12N2)[Hg(C7H3NO4)2]·2H2O, the HgII ion is coordinated by four O and two N atoms of two pyridine-2,6-dicarboxyl­ate (pydc) ligands in a distorted octa­hedral environment. The structure contains two uncoordinated water mol­ecules. In the crystal, N—H⋯O, O—H⋯O and weak C—H⋯O hydrogen bonds and π–π stacking inter­actions between the pyridine rings of the pydc ligands, with a centroid–centroid distance of 3.4582 (18) Å, stabilize the structure

Experimental investigation of sandy soil stabilization using chitosan biopolymer

The performance of an environmentally friendly biopolymer synthesised from secondary resources to overcome the wind erosion of sandy soil was investigated in this study. The study employed a multi-scale approach to investigate the mechanical, erosional, and hydraulic properties of sandy soil. At the macroscale, experimental techniques such as unconfined and triaxial compression tests, permeability measurements, contact angle assessments, and wind tunnel experiments were utilized to characterize the bulk behavior of the soil. Concurrently, molecular dynamics (MD) simulations were conducted at the nanoscale to predict surface mechanical characteristics and elucidate chemical interactions at the molecular level. Results show that when the outer surface of the sandy particles is coated with a sparse concentration of biopolymer, the sandy aerosol inhibitory performance is significant even under extreme storm conditions reaching speeds of 140 km/h of storms. The study on the impact of biopolymer content, curing time, and curing conditions revealed that the addition of chitosan biopolymer has the ability to enhance the bonding between particles and significantly enhance the mechanical properties of sandy soil. The atomic insight from molecular dynamics reveals huge entanglement between sandy particles and biopolymer by Van der Waals interaction. The results of the Unconfined Compressive Strength test indicate that chitosan enhances the compressive strength of sand by up to 320 kPa. Additionally, the triaxial test demonstrated that the application of chitosan led to a 34.2 kPa improvement in the cohesion of sand. Furthermore, analysis of the permeability test results revealed a decrease in the hydraulic conductivity coefficient from 1.6 × 10^-6 m/s to 5.7 × 10^-7 m/s, representing a reduction of approximately 35 %

Estimating the Size and Age-gender Distribution of Women’s Active Social Networks

Background: Network Scale-up (NSU) method is an indirect method for the estimation of hidden behaviors. In NSU, respondents are asked about the number of members they know from a subpopulation of interest (e.g., injecting drug user) and assume that the prevalence of risky behavior in the networks of a random sample of respondents is similar to that of the population. However, first, we need to identify the total number of people each respondent knows [the social network size (C)]; Moreover, certain risky behaviors happen in particular age and gender groups. Our aim was to determine the size and age-gender distribution of female networks.Methods: This cross-sectional study was conducted in the city of Kerman, Iran. A total sample of 1275 women was recruited using multistage sampling. In this study, 25 first names were selected as reference groups. Participants were asked how many people they know with the selected names. The respondent’s answers were categorized into eight separate age-gender subgroups and C was estimated for each subgroup.Findings: The results of this study showed that, on average, each Kermanian woman knows about 234 people and about two-thirds of them are female (82 males and 152 females); moreover, participants were more likely to communicate with their peers. The majority of males (88%) known by Kermanian women were in young and middle age groups; in contrast the female young and middle age groups, who are at reproductive age, form only 45% of the female part of their networks.Conclusion: We have seen that the age-gender distribution of the networks is not the same as that of the general population. Our figures can be applied in NSU studies focusing on risky behaviors of particular age and gender groups

Investigating possible effects of aryl hydrocarbon receptor G1661A polymorphism on asthma severity in adults

311-319Aryl hydrocarbon Receptor (AhR) is a ligand-activated transcription factor with an important role in lung health. The association of AhR polymorphisms with asthma severity has not been yet investigated. We analyzed the association of G1661A, the most prevalent polymorphism of AhR, with the asthma stages in a population-based study including 555 asthmatics (Intermittent: 93, Mild: 240, Moderate: 158, and Severe: 64). The SNP was genotyped using allele-specific PCR. Obtained data were analyzed using the Generalized-Ordered Logit Estimates. Genotypes GA (OR: 0.53, CI: 0.32-0.90, P=0.019) and AA (OR: 0.22, CI: 0.06-0.76, P=0.017) were associated with decreased risk of Severe, Moderate, Mild vs. Intermittent stage; and Severe, Moderate, vs. Mild, Intermittent stages respectively. However, Genotype GA (OR: 1.90, CI: 1.05-3.44, P=0.033), dominant model GA+AA (OR: 2.04, CI: 1.17-3.57, P=0.012), and allele A (OR: 1.68, CI: 1.06-2.66, P=0.027) were associated with increased risk of Severe stage vs. Moderate, Mild, Intermittent stages. Also, male sex and higher age were associated with an increased odds ratio for severe asthma. Furthermore, significant associations with asthma stages were found for the interactions of the SNP and sex, smoking, and alcohol consumption. In conclusion, we revealed that the mutant allele of AhR-G1661A may interact with independent variables and act as a protective factor against lower stages of asthma but it may increase the risk of severe asthma