31 research outputs found

    On matching property for groups and field extensions

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    In this paper we prove a sufficient condition for the existence of matchings in arbitrary groups and its linear analogue, which lead to some generalizations of the existing results in the theory of matchings in groups and central extensions of division rings. We introduce the notion of relative matchings between arrays of elements in groups and use this notion to study the behavior of matchable sets under group homomorphisms. We also present infinite families of prime numbers p such that ℤ/pℤ does not have the acyclic matching property. Finally, we introduce the linear version of acyclic matching property and show that purely transcendental field extensions satisfy this property

    Effects of a Designed Discharge Plan on Anxiety and Length of Hospital Stay in Patients Undergoing Heart Valve Replacement

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    Background & Objective: Anxiety is the most common issue in the candidates of surgical heart valve replacement. The length of hospital stay in these patients is economically and organizationally important as a predictor of their recovery from acute physical conditions. The present study aimed to assess the effects of a designed discharge plan on anxiety and length of hospital stay in patients undergoing heart valve replacement. Materials and Methods: This clinical trial was conducted on 65 candidates of heart valve replacement in Chamran Hospital in Isfahan, Iran, who were randomly divided into the intervention and control groups. In the intervention group, the designed discharge plan was implemented and continued one month after discharge via phone follow-up. Length of hospital stay and anxiety were analyzed before the intervention and one and three months after discharge in both groups in SPSS. Results: ANOVA indicated that the mean anxiety in the study groups was significantly different at different times (P0.05). Conclusion: The designed discharge plan reduced anxiety in the patients, while its effect on the length of hospital stay requires further investigation. Therefore, it is recommended that the discharge program be used as an effective approach to maintaining care in patients undergoing heart valve replacement. Keywords: Discharge Plan, Anxiety, Hospitalization, Heart Valve Replacemen

    On matching property for groups and field extensions

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    Comparison of Oral Stereognosis in 6 and 7 Old Normal Children

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    Objective: This research determined oral stereognosis (form recognition and spent time to recognize) in normal children in north and south of Tehran city to use it in assessment and therapy of oral senses and speech in children with articulation disorders. Materials & Methods: This research was done in 200 children who were 6 & 7 years old and normal in Tehran city. 20 items with different shapes were used and children were wanted to recognize the shapes which were put in their mouth and they should choice one of three shapes located in front of them. Responses and the spent time were calculated. Results: The mean scores of form recognition in children of 6 years old is 17/34 and in children of 7 years old is 17/59. There was no significant difference between them in their scores (P=0.31). In addition, the time of formation diagnosis in 6 years old children is 2/67s (seconds) and in 7 years old children is 2/82s, there was no significant difference between them (P=0.11).The northern city children responded slower than the other group (P=0.000). The only statistically significant score between two sexes was the time of formation recognition which was shorter in girls relative to the boys (P=0.043). Conclusion: Based on this study, a significant correlation could not be found in ability of oral stereognosis in 6 and 7 years old children. But in south of city children can recognize faster than children in northern city. Based on importance of this sense in speech, we suggest normalization of it in different ages

    Crosslinking and pyrolysis of a methyl-silsesquioxane: Effect of heating rate on fabrication of polymer derived mullite ceramics using thermoplastic shaping

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    Poly-silsesquioxanes have been numerously used to produce SiO2 or SixOyCz ceramics through pyrolysis under different atmospheres. In this study, crosslinking and pyrolysis behavior of a commercial methyl-silsesquioxane, was examined using thermogravimetry analysis and a lower SiO2 yield was observed after pyrolysis at low heating rates of 0.3 and 0.6 K/min under air atmosphere, namely 69.1 and 75.0 wt%, respectively. Using ceramic thermoplastic shaping techniques, a low heating rate, below 2 K/min, is usually required to remove processing additive (e.g., binders) gradually and avoid failures like blisters, pores, and cracks. A mixture of SILRES® MK and γ-Al2O3 was prepared to produce a mullite ceramic with Al2O3/ SiO2 ratio of 60/40 wt%. As expected, the stoichiometric ratio of alumina to silica was altered using a heating rate of 0.6 K/min and mullite ceramic with 61.70/37.70 wt% of Al2O3/ SiO2 ratio was obtained. By mixing above the crosslinking temperature of SILRES® MK, a constant ratio of alumina to silica could be achieved successfully, even at low heating rates. In addition, microstructure indicated the growth of needle-like mullite crystals with some amount of SiO2-rich ternary amorphous phase (MgO–Al2O3–SiO2) between the needle grains. Elemental analysis revealed that MgO sintering additive was mainly in the amorphous SiO2-rich phase
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