Browsing by Author "Aktas, M"

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    Relationship Between Abdominal Muscle and Pelvic Floor Muscle Activation in Elderly Individuals with Urinary Incontinence
    Dönbak, BS; Seçer, MB; Aktas, M; Tosun, OC; Kara, B; Tosun, G
    Introduction and HypothesisThe aim of our study is to examine the relationship between abdominal muscles and pelvic floor muscles (PFM) activation in elderly individuals with urinary incontinence (UI).MethodsThis cross-sectional study was conducted with 43 elderly individuals (27 women, 16 men) with UI in a nursing home. Superficial electromyography (EMG) was used to assess the contraction and relaxation activities of the PFM and abdominal muscles (rectus abdominis, transversus abdominis, internal obliques, external obliques). The Overactive Bladder Awareness Questionnaire (OAB-V8) and the Urogenital Distress Inventory Short Form (UDI-6) were used to assess incontinence symptoms and severity. The Geriatric Self-Efficacy Index for Urinary Incontinence (GSE-UI) was used to evaluate the level of self-efficacy. Quality of life was assessed using the Incontinence Impact Questionnaire Short Form (IIQ-7) and the Incontinence Quality of Life Scale (I-QOL). Chi-square test, Mann-Whitney U test, Kruskal-Wallis test, and Spearman correlation analysis were used for statistical analysis.ResultsA moderate positive correlation was found between PFM work MVC and RA work MVC (r 0.540, p 0.001), IO work MVC (r 0.485, p 0.002), and RA rest MVC (r 0.441, p 0.006). When analyzed by gender, significant differences were found in the average activity of RA contraction, average activity of EO contraction, and normalized MVC values (p 0.035, p 0.048, p 0.001). When analyzed by incontinence type, significant differences were found in the TA relaxation MVC and average activity of IO contraction (p 0.006, p 0.011).ConclusionsThere is a relationship between the functions of PFM and abdominal muscles in individuals with UI. Additionally, EMG data during both abdominal and PFM contractions are higher in men at this age. Incontinence type may affect abdominal muscle function.
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    Multi-Purpose High-Performance CO2 Refrigerant Refrigeration System Design
    Sattar, ZTS; Aktas, M; Güven, Y; Bahar, EM
    Increasing energy consumption and greenhouse gas emissions are causing serious environmental problems. Environmentally friendly refrigerants must be used to achieve energy efficiency while reducing environmental concerns. Carbon dioxide, a natural refrigerant, plays a major role. In this study, a two-stage ejector carbon dioxide refrigerant refrigeration system is designed. The designed refrigeration system was intended for heating and medium and low-temperature refrigeration processes. Water and refrigerant circulation system was used for heating and refrigeration of the heating and refrigeration chambers. Using a gas cooler for heating, a heating capacity of 99.66 kW was obtained at a temperature of 144.3 degrees C, and the COP value was calculated as 1.2 6. For the refrigeration process, a refrigeration capacity of 165,56 kW was obtained at- 30 degrees C in the evaporator section, and the COP value was calculated as 2.11. In the designed refrigeration system, the power consumed by the compressor was calculated as 79.08 kW, and a capacity of 265.22 kW was obtained in heating and refrigeration processes. This shows that a dual coefficient of performance of 3.38 was obtained.
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    Investigation of the effects of fan control technique on energy consumption in industrial refrigerated display cabinet: An experimental study
    Kosan, M; Dilber, Y; Erten, S; Bahar, EM; Erdogmus, FN; Aktas, M; Öder, M
    With the increase in electricity consumption and price, energy efficiency in industrial refrigeration systems becomes an even more important issue. The performance of the industrial refrigeration system can be reported by creating energy labeling according to the energy efficiency index value. In this study, the industrial refrigeration system was evaluated in terms of energy performance with proposed a fan control technique and performed an environmentally friendly design using propane (R290) refrigerant. In addition, a new control process was developed for the management of evaporator and condenser fans, and the effect of this process on the cooled package temperatures and energy consumption was investigated. With this new technique, a 25.2% improvement was achieved in the total energy consumption of the industrial refrigeration system. It was observed that the cooled package temperatures were between -1 and +5 degrees C throughout the experiment. The EEI value of the industrial refrigeration system has increased from class E to class D using a new control technique.