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

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

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

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 physical abrasion of rubber polymer reinforced with nanoparticles used in fabrication of medical devices

With recent development in nanotechnology, nanocomposite materials have become of the most important polymeric materials which exhibit excellent biological, physical, chemical and thermal properties. Rubber based nanocomposites is one of the mast interesting field in the literatures and material science. In this paper preparation and characterization of rubber/ resin with nano iron oxide has been done. Two roll mills method have been used for mixing compounds. This route of mixing has been attracted in recent years especially for rubber and resin based nanocomposites. Effect of nano iron oxide on the abrasion properties of compounds has been investigated. The results show that with addition of nano iron oxide to acrylonitrile butadiene rubber/resin matrix, abrasion content of compounds has been decreased. Moreover the scanning electron microscopy and optical microscopy images have been used for better recognition of abrasion manner of compounds

Investigation of the physical abrasion of ternary polymer reinforced with nanoparticles used in medical applications

Nanocomposites are one of the most important polymeric materials that exhibit excellent biological, physical, chemical and thermal properties. Rubber based nanocomposites is one of the mast interesting field in the literatures and material science. The abrasion properties of ternary nanocomposites based on Styrene Butadiene rubber have been investigated with presence of nano aluminum oxide. The nanocomposites have been prepared by mechanical blending using two roll mills. Nano Aluminum oxide particles have been added to Styrene Butadiene rubber/Phenolic Resin binder and the abrasion properties have been surveyed. Results showed that the nano Aluminum oxide particles could enhance the abrasion resistance of matrix due to abrasive properties of nano Aluminum oxide particles. In order to better understanding the behavior of the material, optical microscopic observation and scanning electron microscopic pictures hve been conducted in this investigation that the obtained results revealed the presence of this phenomenon in abrasion properties of the ternary nanocomposite polymeric samples

Adsorption of acetone from polluted air by activated carbon derived from low cost materials

In this investigation, adsorption of acetone from air on the activated carbon derived from agricultural solid waste was studied. The best of our knowledge is to find the best activated carbons from low cost material to remove hazardous compound. The effect of adsorption temperature, initial concentration and effect of raw materials were reported. It is clear that the adsorption temperatures have the negative effect on the adsorption capacity. The adsorption capacity increases with increasing the initial concentration. Three activated carbons were prepared, one (Norit) was purchased and apricot and walnut shell were prepared by physical method and carbon dioxide and water vapor as chemical agent, respectively

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

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

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