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- 저자 : Boza, (검색결과 4 건)
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Body composition: A predictive factor of cycle fecundity
Kayatas, Semra,Boza, Aysen,Api, Murat,Kurt, Didar,Eroglu, Mustafa,Arinkan, Sevcan Arzu The Korean Society for Reproductive Medicine 2014 Clinical and Experimental Reproductive Medicine Vol.41 No.2
Objective: To study the effect of body composition on reproduction in women with unexplained infertility treated with a controlled ovarian hyperstimulation and intrauterine insemination programme. Methods: This prospective observational study was conducted on 308 unexplained infertile women who were scheduled for a controlled ovarian hyperstimulation and intrauterine insemination programme and were grouped as pregnant and non-pregnant. Anthropometric measurements were performed using TANITA-420MA before the treatment cycle. Body composition was determined using a bioelectrical impedance analysis system. Results: Body fat mass was significantly lower in pregnant women than in non-pregnant women ($15.61{\pm}3.65$ vs. $18.78{\pm}5.97$, respectively) (p=0.01). In a multiple regression analysis, body fat mass proved to have a stronger association with fecundity than the percentage of body fat, body mass index, or the waist/hip ratio (standardized regression coefficient${\geq}0.277$, t-value ${\geq}2.537$; p<0.05). The cut-off value of fat mass, which was evaluated using the receiver operating characteristics curve, was 16.65 with a sensitivity of 61.8% and a specificity of 70.2%. Below this cut-off value, the odds of the pregnancy occurrence was found to be 2.5 times more likely. Conclusion: Body fat mass can be predictive for pregnancy in patients with unexplained infertility scheduled for a controlled ovarian hyperstimulation and intrauterine insemination programme.
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J. Hermoso,F. Martinez-Boza,C. Gallegos 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.22 No.-
This paper studies the effect that both aqueous phase fraction and organoclay concentration exert on therheological properties of model suspoemulsions under pressure, commonly used in the formulation ofinvert oil muds for the drilling industry. These emulsions show a complex rheological behaviour thatfollows the Herschel–Bulkley’s model. The yield stress shows a linear dependence with internal aqueousphase fraction for emulsions formulated with low organoclay concentration and power-law dependencefor higher concentration. Barus’ model fits the pressure dependence of suspoemulsion viscosity, fordifferent disperse phase volume fractions and organoclay concentration, fairly well.
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M.A. Izquierdo,F.J. Navarro,F.J. Martınez-Boza,C. Gallegos 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.2
Dimensionally stable bituminous foams were prepared by using 4,40-diphenylmethane diisocyanate/polypropylene glycol (MDI–PPG) quasi-prepolymers, with different molecular weights. From the results obtained, it may be concluded that, after foam formation, the rheological properties are remarkably affected, especially at high temperatures. Paradoxically, the greater the molecular weight of MDI–PPG,the lower the values of viscosities at 60 8C, and the linear viscoelasticity functions of the resulting foams. This result seems to be related to the improved ability of small MDI–PPG molecules to interact strongly with polar bitumen compounds, leading to the formation of larger molecular-sized compounds.
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F.J. Navarro,P. Partal,M. Garcıa-Morales,M.J. Martı´n-Alfonso,F. Martınez-Boza,C. Gallegos,J.C.M. Bordado,A.C. Diogo 한국공업화학회 2009 Journal of Industrial and Engineering Chemistry Vol.15 No.4
The main goal of this research was to compare the modification capability of two different types of bitumen modifiers: non-reactive plastomers and elastomers, and reactive polymers. The group of nonreactive polymers included a block copolymer (SBS), recycled thermoplastic polymers (EVA/LDPE blends), and crumb tire rubber, which were mixed at a processing temperature of 180 8C. In the second group, a reactive MDI–PEG prepolymer, a low processing temperature modifier (90 8C), was considered. The study was mainly focused on the characterization of the thermorheological behaviour of selected modified bitumen samples. In addition, the thermal behaviour (bymodulated DSC), andmorphology (by optical microscopy) of these modified bitumen samples were also evaluated. All of these bitumen modifiers significantly improve the thermomechanical properties of the resulting binder, especially at high in-service temperatures. However, whereas bitumen modified by non-reactive polymers undergo marked oxidation events due to the high processing temperature used (180℃), MDI–PEG modified bitumen does not experience this phenomenon because of the lower processing temperature involved (90℃). In general, non-reactive polymers should be added in much larger concentrations than the reactive polymer to obtain similar results, although the latter requires a further period of curing, at room temperature, to induce suitable modification. Finally, only MDI–PEG modified bitumen is stable when stored at high temperature (163℃), whereas all the non-reactive polymer-modified bitumen studied undergo either phase separation or particle precipitation.
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