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Wyszukujesz frazę "Karimi, Mohammad" wg kryterium: Autor

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    Wyświetlanie 1-4 z 4
    Tytuł:
    An evaluation of the efficiency of endpoint control on the correction of scoliotic curve with brace : A case study
    Autorzy:
    Karimi, Mohammad
    Rabczuk, Timon
    Luthfi, Mauludin
    Pourabbas, Babak
    Esrafilian, Amir
    Powiązania:
    https://bibliotekanauki.pl/articles/949744.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    skolioza
    FEM
    metoda elementów brzegowych
    scoliosis
    brace
    finite element analysis
    boundary condition
    Opis:
    The use of braces is one of the conservative treatment approaches recommended for scoliotic subjects. However, the main question posted here is how to improve the efficiency of braces to control the scoliotic curve or to decrease its progression. The aim of this study was to evaluate the efficiency of various boundary conditions (endpoint control) of brace on the correction of scoliotic curves. Method: CT scan images of a scoliotic subject, with double lumbar and thoracic curves, was used to produce 3d model of spine. The correction of spine (decrease in scoliotic curves) was determined following the use of transverse (lateral-to-medial direction) and the combination of transverse and vertical (upward-directed force, traction) forces on spine in Abaqus software. The effects of pelvic fixation (pelvic basket of a brace) on both sides (basket enclosed pelvic in both sides), on one side (basket enclosed the pelvis in only one side), and fixation of lumbar (part of the brace encircled the lumbar area) were evaluated in this study. Results: The results of this study showed that the effect of vertical forces (traction) was more than that of transverse force. Moreover, the combination of vertical and transverse forces on lumbar and thoracic curves correction was more than that of other conditions (only transverse forces). The best correction was achieved with lumbar fixation and with combination of vertical and transverse forces. Conclusions: The use the combination of vertical and transverse forces may be suggested to correct the scoliotic curve. Moreover, the efficiency of lumbar fixation in frontal plane seems to be more than pelvic fixation to correct scoliotic curve. The outputs of this study can be used to design new braces for scoliotic subjects.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2019, 21, 2; 3-10
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of the Shelf Life of Composite Solid Propellants in Air and Nitrogen Atmospheres through Thermal Ageing
    Autorzy:
    Keshavarz, Mohammad Hossein
    Hosseini, Seyyed Hesamodin
    Mehran, Karimi
    Powiązania:
    https://bibliotekanauki.pl/articles/27787850.pdf
    Data publikacji:
    2021
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    composite solid propellant
    inert atmosphere
    dynamic mechanical thermal analysis
    DMTA
    damping
    ageing
    Opis:
    This work introduces dynamic mechanical thermal analysis (DMTA) as an efficient method for the assessment of the shelf life of solid composite solid propellants in air and nitrogen atmospheres. The samples were aged at three temperatures 323.15, 333.15, and 343.15 K for 60, 120, and 180 days. The two different methods of Arrhenius and Berthelot were used to compare the effects of air and nitrogen atmospheres on the ageing of composite solid propellants. Damping (Tan δ) of composite solid propellants was used to determine the shelf life of the samples based on the loss of half of the physical property Tan δ (50% drop in damping). For the air atmosphere, the calculated activation energy for the degradation reactions of the samples was 86.26 kJ·mol–1. Both models, Arrhenius and Berthelot, confirmed that the shelf lives of the samples under the nitrogen atmosphere are more than four times those in an air atmosphere.
    Źródło:
    Central European Journal of Energetic Materials; 2021, 18, 1; 25--45
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spatial traffic noise pollution assessment – A case study
    Autorzy:
    Monazzam, Mohammad R.
    Karimi, Elham
    Abbaspour, Majid
    Nassiri, Parvin
    Taghavi, Lobat
    Powiązania:
    https://bibliotekanauki.pl/articles/2177360.pdf
    Data publikacji:
    2015-05-13
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    noise pollution
    equivalent sound level
    noise sensitive centers
    GIS
    traffic-induce noise
    vehicle traffic
    Opis:
    Objectives Spatial assessment of traffic noise pollution intensity will provide urban planners with approximate estimation of citizens exposure to impermissible sound levels. They could identify critical noise pollution areas wherein noise barriers should be embedded. The present study aims at using the Geographic Information System (GIS) to assess spatial changes in traffic noise pollution in Tehran, the capital of Iran, and the largest city in the Middle East. Material and Methods For this purpose, while measuring equivalent sound levels at different time periods of a day and different days of a week in District 14 of Tehran, wherein there are highways and busy streets, the geographic coordination of the measurement points was recorded at the stations. The obtained results indicated that the equivalent sound level did not show a statistically significant difference between weekdays, and morning, afternoon and evening hours as well as time intervals of 10 min, 15 min and 30 min. Then, 91 stations were selected in the target area and equivalent sound level was measured for each station on 3 occasions of the morning (7:00–9:00 a.m.), afternoon (12.00–3:00 p.m.) and evening (5:00–8:00 p.m.) on Saturdays to Wednesdays. Results As the results suggest, the maximum equivalent sound level (Leq) was reported from Basij Highway, which is a very important connecting thoroughfare in the district, and was equal to 84.2 dB(A), while the minimum equivalent sound level (Leq), measured in the Fajr Hospital, was equal to 59.9 dB(A). Conclusions The average equivalent sound level was higher than the national standard limit at all stations. The use of sound walls in Highways Basij and Mahallati as well as widening the Streets 17th Shahrivar, Pirouzi and Khavaran, benchmarked on a map, were recommended as the most effective mitigation measures. Additionally, the research findings confirm the outstanding applicability of the Geographic Information System in handling noise pollution data towards depicting noise pollution intensity caused by traffic.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2015, 28, 3; 625-634
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Long Term Effects of Below-the-Knee Angioplasty in Diabetic Patients with Critical Ischemia of Lower Limbs Referred to Sina Hospital During 2010-2011
    Autorzy:
    Zafarghandi, Mohammad-Reza
    Nazari, Iraj
    Taghavi, Morteza
    Rashidi, Abbas
    Dardashti, Sanaz Karimi
    Sadid, Donya
    Esmaili, Leyli
    Mahmoodi, Seyed Mostafa
    Mousavi, Masood
    Powiązania:
    https://bibliotekanauki.pl/articles/1396004.pdf
    Data publikacji:
    2015-03-01
    Wydawca:
    Index Copernicus International
    Tematy:
    diabetic foot
    critical ischemic
    PTA
    lower limbs
    ankle-brachial index
    Opis:
    Despite significant advances in the treatment of diabetic foot ulcers and below-the-knee critical ischemia, there are ongoing efforts to achieve a method with low complication, high success rate and persistence of long-term effects. The aim of the study was to examine the outcome of angioplasty in patients with below-the-knee critical ischemia referred to Hospital. Material and methods. This semi-experimental study conducted on diabetics patients treated with PTA (Percutaneous transluminal angioplasty) with critical ischemia of lower limbs referred to Sina Hospital. After discharge, the patients were followed weekly for the first month and then monthly up to 12 months. The procedure short-term effects were examined through evaluation of wound healing as well as patients' recovery and pain relief, after one month. Given the distribution type, parametric and non-parametric test were used to compare the results before and after treatment. Pearson's correlation coefficient was used to determine the correlation between variables. Results. Twenty four patients participated in this study. The mean ankle-brachial index (ABI) at baseline was 0.55±0.17. A month after angioplasty, the index increased statistically significant to 0.93±0.16. The mean health score expressed by the patients at baseline was 5.48±1.39. A month after angioplasty, it was significantly increased (6.32±1.24). The mean pain score before enrollment was 6.68±2.52 (according to VAS scale). There was a significant decrease over time (3.45±1.13). The overall mean score of all patients at Rutherford Classification was 3.88±0.63 at baseline. During the 1st month and 6th month follow-up, it was changed to Class 0 that was statistically significant in the first month. Conclusions. This study represents the mid-term outcomes of PTA. Although PTA treatment was associated with improved pain scores, satisfaction with health, classification of limb ischemia and diabetic foot ulcers, the effects only remain short-term and mid-term. However, long-term efficacy of PTA needs to be investigated further.
    Źródło:
    Polish Journal of Surgery; 2014, 86, 12; 555-562
    0032-373X
    2299-2847
    Pojawia się w:
    Polish Journal of Surgery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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