Numerical Investigation of Nanofluid Forced Convection in Channels with Discrete Heat Sources

Numerical simulation is performed to investigate the laminar force convection of Al2O3/water nanofluid in a flow channel with discrete heat sources. The heat sources are placed on the bottom wall of channel which produce much thermal energy that must be evacuated from the system. The remaining surfaces of channel are kept adiabatic to exchange energy between nanofluid and heat sources. In the present study the effects of Reynolds number (Re=50,100,200,400, and 1000), particle volume fraction (=0 (distilled water), 1 and 4%) on the average heat transfer coefficient (h), pressure drop (Δ), and wall temperature () are evaluated. The use of nanofluid can produce an asymmetric velocity along the height of the channel. The results show a maximum value 38% increase in average heat transfer coefficient and 68% increase in pressure drop for all the considered cases when compared to basefluid (i.e., water). It is also observed that the wall temperature decreases remarkably as Re and ϕ increase. Finally, thermal-hydraulic performance (η) is evaluated and it is seen that best performance can be obtained for Re=1000 and =4%

Monometal and Competitive Adsorption of Cd, Ni, and Zn in Soil Treated with Different Contents of Cow Manure

This study was conducted to assess the monometal and competitive adsorption of Cd, Ni, and Zn in the soil incubated with different contents of decayed cow manure (: 0, : 25, and : 50 tha−1) for 90-d at 25°C. Sorption isotherms were characterized using the linear Freundlich equation. Most sorption isotherms were well described by the Freundlich equation (maximum and minimum ) and the monometal and competitive adsorption isotherms of Zn, Cd, and Ni followed the L-curve type (L-2). Results showed that the mono- and multimetal sorption amounts increased with an increase in organic amendment content as the sorption capacities for Cd, Ni, and Zn followed the following sequence: . This sequence was consistent with the CEC and particularly pH for the three soils. All soils showed greater sorption capacity for Zn than the other trace elements as the sorption sequence in was , while in both and was . Therefore, the metal-binding sites in OM were more selective for Zn and Ni than Cd. Competition significantly reduced metals , especially for Cd and Ni

Superior Mesenteric Artery Syndrome: A Worldwide Descriptive Study with Literature Review

Background: Superior mesenteric artery syndrome is best described as compression of the third part of duodenum by the superior mesenteric artery, resulting in obstruction. This rare condition has been studied for decades yet remains obscure. This study aimed to analyze different clinical presentations, diagnostic modalities, treatment approaches and outcomes of this condition. Methods: Thirty-five superior mesenteric artery syndrome cases were collected retrospectively from a Facebook group called “Superior Mesenteric Artery Syndrome Awareness & Support”. A questionnaire was designed using Google Forms to obtain the demographics, presenting symptoms, risk factors and co-morbidities, investigations, means of treatment and the outcomes. Data was entered into Microsoft Office Excel for statistical analysis. Results: The median age at diagnosis was 22 years. The median body mass index was 20.8 kg/m2. The median time interval from symptom onset to initial diagnosis was 22 months. The major presenting symptoms were abdominal pain (82.9%), nausea (77.1%), and vomiting (65.7%). Abdominal computed tomography scan with contrast (82.9%) was commonly used for confirmation of diagnosis. Thirteen cases (37.1%) were congenital. Thirty patients (85.7%) had received treatment. The overall management success was only 13.3%. Surgical management (34.3%) was the most commonly used regimen. Conclusion: Diagnosis of superior mesenteric artery syndrome is established after a thorough assessment of the clinical presentations and confirmed with suitable imaging modalities. The choice of treatment should be dependent on the causes and severity as different patients respond differently to therapy. Recurrence is possible in all patients, and a long-term follow up is thus required

Ideas, increasing return to scale, and economic growth: an application for Iran

Iran has experienced an increasing rate of economic growth during recent years. We need to explain the causes of this growth if we are to help maintain it. In this study, we try to calibrate and apply a model in the context of new growth models, based on Ideas derived from the Iranian economy. The results show that an increase in education levels and expansion in research activities are the main factors promoting economic growth in Iran during the studied period

Ideas, increasing return to scale, and economic growth: an application for Iran

Iran has experienced an increasing rate of economic growth during recent years. We need to explain the causes of this growth if we are to help maintain it. In this study, we try to calibrate and apply a model in the context of new growth models, based on Ideas derived from the Iranian economy. The results show that an increase in education levels and expansion in research activities are the main factors promoting economic growth in Iran during the studied period

The Effectiveness of GECB Pastille in Reducing Complications of Dry Socket Syndrome

Background and Purpose. Dry socket syndrome is one of the most irritating complications after tooth extraction. This study aims to investigate the efficacy of pastille GECB compared to ZOE. Materials and Methods. 30 patients with dry socket syndrome were selected and divided into two groups. GECB pastille was produced with 3% Guaiacol, 3% Eugenol 1.6% Chlorobutanol, sized 3 × 7 × 10 mm. GECB was applied in one group, and ZOE was used for the other group. Duration of pain after treatment and painkiller intake values were recorded within 20 days. The data were analyzed with independent samples t-test, Mann-Whitney, and Chi-Square tests. Results. Pain persisted for 45.53 ± 33.34 minutes in patients treated with ZOE and 19.87 ± 21.80 minutes in those treated with GECB (P = 0.19). Patients in the ZOE group reported more painkiller intake within 20 days (P = 0.031). Conclusion. GECB showed more significant efficacy in reducing complications after tooth extraction

The Influence of Electronic Word-of-Mouth on Consumers’ Purchase Intentions and Brand Awareness in Iranian Telecommunication Industry

Electronic word of mouth (eWOM) is an emerging marketing experience for consumers which impacts their assessment of different existing brands and products such as mobile brands through online communication channels. This study aims to explain the effect of Word of mouth on purchase intention and brand awareness focusing on Samsung cellphone brand. The group studied in the current work is a sample of Samsung customers in Esfahan city in Iran (2015). In this study, for the sake of data collection, a form of descriptive research method is applied. The Statistical sample consists of 384 respondents who accepted to take the survey which was prepared in the form of a questionnaire. According to result analysis, the study showed that there is a significant positive relationship between the electronic word of mouth and purchase intention and there is a significant positive relationship between the awareness of a brand and purchase intention while there was no effective relation found between electronic word of mouth and brand awareness. Base on this, out of the three proposed hypothesis two hypothesis are accepted and one hypothesis is not denied. Keywords: electronic word of mouth, purchase intention, Brand awarenes

Changes in monocarboxylate transporter 1 and p53 gene expression by aerobic interval training in the experimental colon carcinoma of mouse

Background: Recent evidence suggests that regular exercise training is effective in treating various aspects of cancer. Therefore, the purpose of this study was to determine the effect of 8 weeks of aerobic interval training on monocarboxylate transporter 1 (MCT1) protein and expression of p53 gene in tumor of colon cancer mice. Methods: The present study was conducted experimentally from May to October 2014 at the Exercise Physiology Research Center of Baqiyatallah University of Medical Sciences, Tehran, Iran. Twenty BALB/c mice of age 3 weekly with a mean weight of 17.6±1.4 grams were selected and randomly divided into 4 groups: control (N=5), interval training (N=5), colon tumor (N=5) and interval training+colon tumor (N=5). The cancer was induced by subcutaneous injection of a carcinogenic azoxymethane (10 mg/kg) once a week for three weeks, and aerobic exercise was performed with rodent treadmill for 8 weeks and 5 days a week. Forty-eight hours after the last training session, the mice were cleared and colon removed. Measurement of MCT1 protein was performed by ELISA and commercial kits (ZellBio, Germany). Real-time polymerase chain reaction (PCR) was used to determine the relative expression of p53 gene. Data were analyzed by Kruskal-Wallis test and Mann-Whitney U tests. Results: The results showed a significant increase in MCT1 protein (P< 0.01) and significant reductions in p53 gene expression (P< 0.001) in a colon tumor group compared to other groups. Also, there was a significant decrease in the level of MCT1 protein (P< 0.01) and significant increase in p53 gene expression (P< 0.001) in the exercise training group and exercise training+colon tumor group compared to control group and the tumor group was observed. Conclusion: The findings of the study showed that aerobic interval training reduced the protein content of MCT1 and increased the expression of p53 gene (as a tumor inhibitor) in the tumor of colon cancer mice. These factors are portions of the mechanisms involved in cancer cell metabolism by which aerobic interval training shows part of its therapeutic effect in colon cancer

Common Aeroallergens in Patients with Asthma and Allergic Rhinitis Living in Southwestern Part of Iran: Based on Skin Prick Test Reactivity

Aeroallergens continue to have a key role in the pathogenesis of asthma and allergic diseases and have recently received increased attention in medical research throughout the world. The prevalence of aeroallergens vary in different regions, depending on the type of climate. The aim of the present study was to determine prevalence of the sensitivity to aeroallergens among patients with asthma and allergic rhinitis (AR), based on skin prick test (SPT) reactivity in the province of Bushehr, Iran. In this cross-sectional study, 743 patients were enrolled. The participants had asthma and AR and reacted to at least one allergen with SPT. Skin prick test with standard extracts including house dust mites (HDMs), animal dander, molds and pollens were performed on patients according to the herbal geography of the area. The male to female ratio and mean age of the patients were 1.03 and 27.6± 15.4 year, respectively. Out of 567 patients with AR, the common aeroallergens were HDMs (88.5%), molds (82.9%), animal dander (79.5%), weeds (77.6%), trees (75.5%) and grass pollen (71.5%). Moreover, among 176 patients with asthma, the prevalence of aeroallergens were HDMs (90.5 %), molds (80.7%), animal dander (77.5%), weeds (73.3%), trees (73.3%) and grass pollen (67.9%). The sensitivity to animal dander, Chenopodium album and Russian thistle pollens were significantly associated with the severity of AR. Moreover, sensitivity to animal dander such as cat and feather of birds, cockroach, Bermuda grass and Chenopodium album pollens were significantly associated with the severity of asthma. The results of this study revealed that HDM was the most common sensitizing aeroallergen in patients with asthma and AR. Molds and animal dander as indoor allergens were also common aeroallergens. We suggest that the hot weather and ambient humidity in the region may be the main cause of the change in the pattern of SPT reactivity