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Influence of nickel addition on the microstructure and mechanical properties of Al2O3–5vol%ZrO2 ceramic composites prepared via precipitation method

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International Journal of Minerals,Metallurgy and Materials 2019年第7期26卷 908-914页

作者： Betül Kafkasl?o?lu Y?ld?z Hüseyin Y?lmaz yahya kemal tür Department of Materials Science and Engineering Gebze Technical University

the aim of this work was to investigate the microstructure and mechanical properties of 1vol%-Ni-added yttria-stabilized zirconia (YSZ) toughened alumina composites. First, Ni powders were heterogeneously precipitated in an alumina–zirconia powder mixture suspended in water;the prepared specimens were then pressureless sintered at 1550°C/2 h in a 90vol%Ar/10vol% H2 atmosphere. the structure of phases and microstructure of the composites were characterized by X-ray diffraction and scanning electron microscopy, respectively. Mechanical characterization of the specimens was carried out through Vickers hardness, Vickers indentation toughness, and three-point flexural bending tests. the fine Ni particles were homogeneously dispersed throughout the alumina matrix because of the employed processing method. Furthermore, hardness and toughness values were found to increase by 8% and 50%, respectively, with Ni addition, whereas the relative densities and flexural strength values were found to remain unchanged.

关键词： alumina zirconia ceramic matrix microstructure hardness strength toughness

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Ionized calcium level predicts in-hospital mortality of severe sepsis patients:A retrospective cross-sectional study

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Journal of Acute Disease 2021年第6期10卷 247-251页

作者： Bora Cekmen ramazan Koylu Nazire Belgin Akilli yahya kemal Gunaydin Oznur Koylu Seref Emre Atis Basar Cander Department of Emergency Medicine Konya Education and Research HospitalKonyaTurkey Department of Emergency Medicine Ankara Education and Research HospitalAnkaraTurkey Department of Biochemistry Konya Education and Research HospitalKonyaTurkey Department of Emergency Medicine Mersin City HospitalMersinTurkey Department of Emergency Medicine Kanuni Sultan Suleyman Education and Research HospitalIstanbulTurkey

Objective:to evaluate the effect of serum ionized calcium levels on the prognosis of severe sepsis ***:this retrospective cross-sectional study included sepsis patients who were hospitalized in an intensive care unit between January 2011 and December *** demographic and baseline data of the patients who died and survived were *** cutoff value of ionized calcium for in-hospital mortality was determined by the receiver operating characteristics curve(rOC).In-hospital mortalities and the survival rates were compared between patients with different ionized calcium ***,the risk factor of in-hospital mortality was ***:this study included 145 patients with 113 patients who died in the *** patients who died had significantly lower ionized calcium levels(U=2.25,P=0.034).A cut-off value of 0.93 mmol/L of ionized calcium was determined by the rOC *** patients with ionized calcium>0.93 mmol/L showed a significantly lower morality(χ2=9.90,P=0.002)and higher survival rate than with≤0.93 mmol/L(log rank=6.20,P=0.010).Multivariate Cox regression revealed that ionized calcium≤0.93 mmol/L was a risk factor of in-hospital ***:Ionized calcium level≤0.93 mmol/L was an independent predictor of in-hospital mortality of severe sepsis.

关键词： Ionized calcium Critically illness Sepsis Mortality In-hospital

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the relationships Between Milk Constituents and Various Milk Properties in Anatolian Buffaloes

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Journal of Life Sciences 2012年第8期6卷 908-912页

作者： OEzel. Sekerden yahya kemal Avsar Dept. of Anim. Sci. Fac. of Agric. Mustafa Kemal Univ. Antakya 31034 Turkey Dept. of Food Engineering Fac. of Agric. Mustafa Kemal Univ. Antakya 31034 Turkey

the objectives of this study were to investigate the relationships among milk composition, renneting time, urea concentration, acidity, density and pH of Anatolian Buffaloes" milk. As a total of 115 individual milk samples from 53 Anatolian buffalo cows that calved in 2004 and 2005 on days of their lactations 30 ± 15, 60 ± 15, 90 ± 15, 120 ± 15, 150 ± 15, 180 ± 15, 210 ± 15, 240 ± 15 and 270 ± 15 in 8 units of Ilikpinar village were collected in morning milkings in June, September, December and March. Samples were analysed for total dry matter (tDM), fat, protein, ash, density, pH, acidity, renneting time and urea content. Data were classified according to the following environmental factors: lactation stages: 1 (30 ± 15, 60 ± 15, 90 ± 15 days): 2 (120 ± 15, 150 ± 15, 180 ± 15 days): 3 (210 ± 15, 240 ± 15, 270 ± 15 days); calving year: 1 (2004), 2 (2005); calving season: 1 (January-May), 2 (September and October); month of samples collection: 1 (June), 2 (September), 3 (December), 4 (March); lactation order: 1 and 2:1, 3 and 4:2, 5 and 6:3. Means and correlation coefficients for the characteristics investigated were calculated. there were negative significant correlations between daily milk yield with tDM, fat and protein percentages, and between pH and all of the milk constituents. Density reduces as tDM, fat and protein contents increase. relationships between density and coagulation time with milk yield and pH were not significant. relationships between milk urea concentration with none of milk constituents, milk yield, density, pH and titratable acidity were not significant statistically. It was concluded that genetic selection has to be directed towards increasing fat, protein and total not fat dry matter yields. Under selection programs in which milk yield is taken into consideration, fat and protein yields also increase, but fat and protein concentrations decrease.

关键词：牛奶成分水牛蛋白质含量日产奶量属性尿素浓度凝血时间牛奶样品

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