Evaluation of specificity of CT angiography compared to conventional angiography for 16-Row Scanner

Herein, authors have evaluated the specificity of CT angiography (CTA) in comparison with conventional invasive angiography (CIA) in the diagnosis of coronary stenosis. For this purpose, 8 patients suspected to stenosis was used. They were undertaken CIA procedure after CTA using 16-multidetector-row machine. Result reveals that for patient-base analysis, the specificity of CTA was 25. The values of specificity reveal a unacceptable performance of CTA. However, due to low number of patients, the obtained results cannot be used for final decision

Evaluation of Negative Predictive Value (NPV) of 16-Row CT angiography in comparison with conventional angiography

Negative predictive value (NPV) is one of the important indicatives for evaluating a medical procedure. Herein, we have evaluated the NPV of 16-multidetector-row CT angiography (CTA) in comparison with conventional invasive angiography (CIA) in the diagnosis of significant stenosis. In this regard, 8 patients suspected to stenosis were investigated. They patients were undertaken CIA procedure after CTA. The obtained results show, the NPV of 50 for patient-base analysis. The findings of this study reveal that CT angiography with 16-slice scanner might be considered as an acceptable technique for rapid triage of patients. Low values of NPV reveal a moderate performance of CTA. However, due to low number of patients, the obtained results cannot be used for final decision. Hence, more is required to improve and achieve reliable results

Positive predictive value of 16-Row CT angiography as compared with conventional invasive angiography

In this work authors have evaluated the positive predictive value of 16-multidetector-row CT angiography (CTA) in comparison with conventional invasive angiography (CIA) in the diagnosis of significant stenosis. For this purpose, 8 patients suspected to significant stenosis was investigated. These patients were undertaken CIA procedure after CTA. Result of this study reveals that for patient-base analysis, the positive predictive value of CTA was 87.5. The findings of this study reveal that CT angiography with 16-slice scanner might be considered as an acceptable technique for rapid triage of patients. High values of PPV reveal a moderate performance of CTA. However, due to low number of patients,the obtained results cannot be used for final decision

Influence of the addition of nano-Silica particles as reinforcement on the tensile yield properties of Polyamide 6 polymeric matrix used in medical applications

It is well known that the polymer matrix nanocomposites are one of the most important polymeric materials that are used in medical applications due to the exhibition of very good mechanical and thermal properties. In this study the authors have used Polyamide 6 (Nylon) polymer for preparing polymeric nanocomposite samples. Silica nano-particles have been used as reinforcement for reinforcing the polyamide 6 polymer matrix. After the sample preparation, influence of nano-particles on the tensile ultimate strength and tensile Young modulus of the Polyamide 6 has been investigated experimentally. It is found that using nano-silica can significantly improve the tensile properties of Polyamide 6 polymer. Test results shows that addition of nano-scale silica particles can modify the tensile characterstics of the polymer i.e. improve the tensile elastic Young's modulus of the polymer. Similar trend is observed for the tensile ultimate strength of polyamide 6 nanocomposites, where the presence of nano-silica modify the ultimate strength of the material

Removal of m-xylene from water by impregnated activated carbon

Volatile organic compounds (VOCs) are the main matters which can pollute water therefore, must be controlled under increasingly stringent environmental regulations.This work analyses the adsorption of impregnated active carbons prepared with oak bark to remove m-xylene from aqueous solutions. When the impregnation step is performed on the raw material then carbonizations of activated carbon was carried out. Not expensive raw material and chemical agent were used as active species where used for preparing the appropriate adsorbent for removal of m-xylene from water. In this work the effect of adsorption temperature, pH and the initial concentration of process were investigated. It is clear that with increasing the initial concentration the removal efficiency of adsorption will be increased. The effect of temperature was studied by increasing the temperature from 20 to 60 °C. with increasing the temperature the removal efficiency will be increased in the range of 20-60 °C

Investigation of the removal of heavy hazardous metals by agricultural solid waste as an cheap reliable adsorbent

It is well-recognized that the heavy metals are among the prominent contaminants in aqueous solutions. This hazardous metal can result in a high risk contamination and causes illness. It should be mentioned that the metals also appears in wastewaters of a lot of manufacture and it can produce variety of undesirable effects. For removal of this contaminant from water many methods are used in this way. This paper investigates adsorption Sr (II) from aqueous solutions is the most important aim of this paper. A low cost adsorbent which prepared by hazelnut shell as an agricultural solid waste was used in this study. The best of our knowledge is to use solid waste as an adsorbent without converting it to activated carbon, just by simple method. Some operational conditions such as temperature, speed velocity of stirrer and dose of prepared adsorbent were investigated by some experiments. The high efficiency adsorption was achieved by this low cost adsorbent. The raw material in this research was collected from Iranian garden

Investigation of the morphological properties of medical-used natural rubber composites reinforced with nano Iron oxide nanoparticles

Polymer matrix nanocomposites are one of the most important polymeric materials that exhibit very good mechanical and thermal properties. These materials have applications in medical goods. In this paper nanocomposites based on natural rubber and solid epoxy polymeric resin reinforced with nano-sized iron oxide (Fe2O3) nanopatricles are prepared via mechanical blending method. Indeed the melt mixing process by two roll mills are used in this investigation to prepare a well-dispersed nanocomposite samples. In these compounds, dispersion and distribution of nano iron oxide in the natural rubber / solid epoxy resin matrix are investigated. We investigate the morphology of natural rubber / solid epoxy resin/nano iron oxide nanocomposites by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results of morphological observations of present investigation showed that the presence of nano iron oxide has almost been distributed in the natural rubber matrix

The comparison of satisfaction of prosthesis in below amputation men using a mechanical and Myoelectric prosthesis by using of TAPES questionnaire

Design and manufacturing of the Myoelecterical prosthesis (in compared to Mechanical prosthesis) is time consuming and expensive. Therefore, considering the high cost of these prostheses should be increase the satisfaction of prosthesis. This study was conducted on assessing the quality of life between two groups. The two groups compared from the aspect of quality of life. The participants were categorized in two groups of 20 below elbow amputation veterans that use from Mechanical or Myoelectrical prosthesis that refer to central technical orthopedic Kosar. For gathering the data we use TPEAS questionnaire. This questionnaire evaluates participants from 3 items: psychosocial adaptation, functional limitation and satisfaction of life. For data analysis use to t independent and ANOVA test. The obtained results revealed that there are significant differentiations in prosthesis satisfaction. This identified that the Myoelecterical groups have upper prosthesis satisfaction in compare to Mechanical group. Therefore the hypothesis of this research in terms of higher satisfaction in the Myoelecterical group was accepted. Keivani Hafshejani mA, Sattari Naeini M, Langari A. The comparison of satisfaction of prosthesis in below amputation men using a mechanical and Myoelectric prosthesis by using of TAPES questionnaire. Life Sci J 2012;9(4):5588-5592] (ISSN: 1097-8135). http://www.lifesciencesite.com. 83

On the functional limitation in below elbow amputation men using Mechanical and Myoelectric prosthesis via TAPES questionnaire

It is well established that the Myoelecterical prosthesis must also be effective, smart, light, strong and high permanence, compared to those of Mechanical prosthesis. It is time consuming and expensive that has ultimately led to significant increases in the price of Myoelecterical prosthesis. Therefore, considering the high cost of these prostheses should be decrease the functional limitation, hence assessment the functional limitations between two groups must be clear and explicit. Therefore this study was conducted in this regard. In this descriptive cross-sectional analytical study, to groups compared to each other from quality of life, participants was two groups of 20 below elbow amputation veterans that use from Mechanical or Myoelectrical prosthesis that refer to central technical orthopedic Kosar. For gathering the data we use TPEAS questionnaire. This questionnaire evaluates participants from 3 items: psychosocial adaptation, functional limitation and satisfaction of life. For data analysis use to t independent and ANOVA test. This research showed that there are significant differences between two groups from functional limitation. The findings identified that the Myoelecterical groups have lower functional limitation in compare to Mechanical group. So that the hypothesis of this research in terms of lower functional limitation in the Myoelecterical group was accepted. Keivani Hafshejani mA, Sattari Naeini M, Langari A. On the functional limitation in below elbow amputation men using Mechanical and Myoelectric prosthesis via TAPES questionnaire. Life Sci J 2012;9(4):5579-5582] (ISSN: 1097-8135). http://www.lifesciencesite.com. 82

A Study on anisotropy of cosmic ray distribution with a small array of water-cherenkov detectors

The study of the anisotropy of the arrival directions is an essential tool to investigate the origin and propagation of cosmic rays primaries. A simple way of recording many cosmic rays is to record coincidences between a number of detectors. We have monitored multi-TeV cosmic rays by a small array of water cherenkov detectors in Tehran(35 43 N, 51 20 E, 1200m a.s.l). More than 1.1*10^6 extensive air shower events were recorded. In addition to the Compton- Getting effect due to the motion of the earth in the Galaxy, an anisotropy has been observed which is due to a unidirectional anisotropy of cosmic ray flow along the Galactic arms.Comment: 16 pages 9 figs and one tabl