فهرست مطالب amin asefi

Hand dermatitis is a group of diseases that result in inflammation of the skin in the area of the hand. The prevalence of latex allergies has been increasing in recent years, one of the reasons being the use of latex gloves to maintain safety. This study aimed to evaluate the effect of wearing cotton-polyester gloves under surgical latex gloves to improve the symptoms. This study is a randomized controlled clinical trial performed in Alzahra and Ayatollah Kashani hospitals in Isfahan. The statistical population consisted of the staff of the surgery room. Sampling was done by the census from October 2018 to March 2019. Cotton-polyester gloves (weight between 5–10 grams, 50% cotton and 50% polyester) are soft and flexible and easily absorb the sweat- under latex gloves. Also, it can be re-sterilized with ethylene oxide. In rupture of surgical gloves due to strong and integrated stitching, the cotton-polyester gloves prevent hand burns with electrocautery or damage by sharp objects. These gloves were distributed and used among the samples for 6 months. Data were analyzed based on symptoms of erythema, appearance, economic burden, and disruption in daily life; there was a significant relationship between lack of using cottonpolyester gloves under the surgical gloves compared to when using them (P<0.01). However, there was no significant relationship between pain and disorder in social relations (P>0.01). Using cotton-polyester gloves under surgical latex gloves can improve the symptoms of dermatitis. On the other hand, the use of these gloves will not interfere with the function of the hands.

One way to improve air-fuel mixing in a gas diffusion flame is to produce targeted vortices and circulate the flow using a bluff body. In this study, the influences of radius, thickness, and location of a disk-shaped bluff body on the performance of a methane gas diffusion flame are numerically studied. This investigation is carried out under both cold mixing and hot mixing (with combustion reaction) conditions. The present simulation is verified against experimental data. The results show the substantial influence of the mentioned parameters on the size and intensity of downstream vortices, and a direct dependence is observed between the sizes of inner and outer recirculation zones and air-fuel mixing. It is also observed that the flow pattern and level of air-fuel mixing are more dependent on the bluff body’s radius than its thickness. Based on the hot mixing simulation results and regarding the dependence between the rates of the chemical reaction and turbulence mixing, the higher rate of air-fuel mixing is associated with the decreased flame length. Among the cases investigated, the bluff body with a radius of 6mm, the thickness of 5mm, and axial location of 5mm away from the air channel exit results in the best air-fuel mixing.