Wound healing after a tooth extraction is a complex process that helps repair wounds. Wound dressings are helpful for better healing. These agents should have the least inflammatory stimulation and the most antimicrobial properties. This study tried to investigate the e More
Wound healing after a tooth extraction is a complex process that helps repair wounds. Wound dressings are helpful for better healing. These agents should have the least inflammatory stimulation and the most antimicrobial properties. This study tried to investigate the effect of polycaprolactone-hydroxyapatite zeolite nanocomposites on the healing processes of the mucosa covering the alveoli after extraction. Fifteen healthy cats with lower premolar teeth caries were determined, and tooth extraction was performed. A biopsy sample was taken from the mucosa of the tooth extraction site on the 10th day after surgery. Premolar teeth of all 15 cats were extracted, and three groups were grouped as control, PRP, and nano polycaprolactone-hydroxyapatite zeolite. Histopathological analysis showed that unlike the control group and PRP, the nano group had a much better trend compared to the control group and the PRP group, with less presence of inflammatory cells, complete irregular epithelial tissue, more fleshy bud tissue, and more fibrosis. Polycaprolactone-hydroxyapatite zeolite nanocomposite accelerates wound healing after tooth extraction.
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Background and Objectives: Increasing fossil fuel consumption in the building, especially in the air conditioning sector, has increased environmental pollution and global warming.In this research, a zero-energy passive system was designed in a warm and dry climate to ve More
Background and Objectives: Increasing fossil fuel consumption in the building, especially in the air conditioning sector, has increased environmental pollution and global warming.In this research, a zero-energy passive system was designed in a warm and dry climate to ventilate the building and provide comfortable conditions for people in the summer. This Hybrid Passive Cooling System (HPCS) includes two distinctive systems: the Solar Chimney (SC) and Evaporative Cooling Cavity (ECC).Method: This research experimental-analytical and simulation studied and tested the ability of the system in cooling the building in the warmest month of the year from 9: 00 am to 3:00 pm for ten consecutive days. The air temperature, humidity, and ambient air velocity were measured at the outlet of the evaporative cooling channel and the inlet of the solar chimney.Findings: The findings showed this system could reduce the air temperature by an average of 10 and could increase the air humidity by 34%. Moreover, the air velocity of the SC increased as the air got warm so that the maximum inlet air velocity in the solar chimney reached the highest level (2.8) at 3 pm. In addition. Since the outlet air velocity of the windcatcher rose to 0.41 at 3:00 pm compared to 9:00 am, which is equivalent to an air temperature drop of 3.6, the chamber was in comfort condition by using the hybrid system at 3:00 pm.Discussion and Conclusion: The results show that using a passive hybrid system, the chamber is in comfortable condition from 9:00 am to 3:00 pm. Calculating the cost of constructing and installing a hybrid passive system and comparing it with a water cooler indicates that the proposed is profitable since used, and the return time of the system after running and launching the system.With an increase in the number of people from 1 to 4 people, the room is in comfortable conditions at 9 am and noon, but at 3 pm the room is placed with 4 people out of the comfort zone.
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In this paper, we present an electro-optical modulator based on graphene absorption. In this structure, graphene is placed on aluminum oxide, the structure of which is repeated alternately. This alternating structure of graphene on aluminum oxide is located inside a sem More
In this paper, we present an electro-optical modulator based on graphene absorption. In this structure, graphene is placed on aluminum oxide, the structure of which is repeated alternately. This alternating structure of graphene on aluminum oxide is located inside a semi-cylindrical cavity in a 1-dimensional photonic crystal nanobeam cavity. Unlike previous articles, which consisted of cylinder holes and different areas in the nanobeam cavity is formed by changing the radius of the holes, in this structure, semi-cylinder holes have been used and, different areas are formed by rotating these semi-cylinders. This type of crystal photonics has a high quality factor. Also, this type of modulator requires little space after construction, so they are a very good option for integrated circuits. In this paper, three-dimensional finite-difference time-domain method is used for analysis. In this modulator, it is observed that by changing the bias voltage, the amount of absorption peak and also its resonance wavelength are changed. As a result of these changes, we achieve a modulation depth of about 7dB. Our proposed structure can have potential applications in integrated optical circuits, especially in telecommunication frequencies.
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