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71.
Condensing of a sugar–water solution is a widely used production process, especially in food industry. In this study, boiling
temperature and heat transfer of different concentration levels of sugar/water solution is experimentally studied. In the
experiment, the pool boiling with constant temperature difference between surface and boiling temperature is investigated.
Boiling point of sugar/water solution depends on sugar mass concentration and on vapor phase pressure. A function is suggested
to calculation the boiling temperature. The experimental data and the calculated values of boiling temperature are compared.
The results are verified with previous investigations. It is determined that the heat flux between surface and sugar/water
solution while pool boiling displays a linear relation with water mass concentration in the solution. Heat transfer coefficient
could be determined in dependency of surface temperature and sugar mass concentration. Furthermore a function is suggested
to predict the heat flux for engineering purpose, which is already used in similar form for pure substances. 相似文献
72.
Öznur Özdemir-Akyıldırım Işılay Talay-Değirmenci 《The Journal of the Operational Research Society》2015,66(1):66-75
We propose a stochastic model and provide an easy-to-implement optimization tool for admission decisions to specialized training programmes designed for service industries. The model can be applied for staffing of trainees in medical residency programmes, vocational schools, management trainee programmes, and similar. Especially towards graduation, trainees in these programmes substantially contribute to workforce of their affiliated institutions, thus having a targeted number of advanced level students become a potential performance metric for administration. For uncertain attrition rates and study duration, we model and provide an iterative solution algorithm to find the optimal annual admission number for these programmes. Our numeric analysis results show that the solution is robust to changes in attrition and study duration probabilities; hence, our model is robust against specification errors for these parameters, which could be hard to estimate due to data unavailability and fluctuations in educational and economic conditions. 相似文献
73.
Tijen?Tanyal??nEmail author Fran?ois?Eyskens Eddy?Philips Marc?Lefevere Orcan?Tanyal??n 《Accreditation and quality assurance》2004,9(3):164-167
Laboratory medicine is an important discipline in health care with its remarkable effect on risk assessment, diagnosis of health, and disease state. This accounts describes a newborn screening approach involving retest, recall, and follow-up procedures. This real life trial emphasizes the need for split-sample design evaluation of newly opened test kits. Quantitative measurements of phenylalanine and neonatal thyroid stimulating hormone (nTSH) were performed in two laboratories. After validation of the calibration in the laboratory that was using the industrially prepared screening kits for the first time, the same real newborn blood spot samples were analyzed for phenylalanine and nTSH measurements in both laboratories and the results obtained were compared non-parametrically, and examined by Deming regression and difference plots. There was no problem with the phenylalanine results: similar results were obtained for the same blood spot cards in both laboratories (P=0.496; bias estimation 0.13). However, the nTSH values were found to be significantly higher in the laboratory that used the nTSH kit for the first time. Although the validation of the calibration of the nTSH kit was valid with the manufactures control materials, spilt-sample results showed that there was a significant difference between the two laboratories (P=0.005; bias estimation 28.6). This study implies that acceptable comparability of split-sample design analysis is needed for testing the analytical performance of industrially prepared tests kits, and this can only be achieved with certified reference materials.Presented at the 8th Conference on Quality in the Spotlight, 17–18 March 2003, Antwerp, Belgium 相似文献
74.
Ismail Özdemir Nevin Gürbüz Yetkin Gök Bekir Çetinkaya Engin Çetinkaya 《Transition Metal Chemistry》2005,30(3):367-371
Six rhodium–carbene complexes (2a–f) have been prepared and the new compounds characterized by C, H, N analyses, 1H-n.m.r. and 13C-n.m.r. Phenylboronic acid reacts with aldehydes in the presence of a catalytic amount of rhodium(I)–carbene complex, RhCl(COD)(1,3-dialkylbenzimidazolidin-2-ylidene), (2a–f), to give the corresponding aryl secondary alcohols in good yields. 相似文献
75.
In this paper we study pseudo \({\varphi}\)-structure on a differential manifold in which is a tensor field of type (1, 1) satisfying \({\varphi^{3}\,-\,\varphi=0}\). We obtain basic curvature tensor fields for pseudo f-manifolds with complemented frame. 相似文献
76.
In the present paper, we define the difference sequence space r
q
(p, Δ), which is defined as follows:
where r
q
(p) is the Riesz sequence space given by Altay and Basşar. We give some topological properties and compute the α-, β- duals of this space.
相似文献
77.
İsmet Kaya İbrahim Erdem Orta Eyüp Özdemir Dilek Şenol 《Journal of the Iranian Chemical Society》2018,15(1):35-46
In this study, Schiff bases containing azomethine (–HC=N–) compounds were synthesized from the condensation reaction of 4-aminophenol and 2-aminophenol and 5-methyl-2-furaldehyde. Orange-colored Schiff bases, 4-[(5-methyl- 2-furyl) methyleneamino] phenol (4MFMAP) and 2-[(5-methyl-2-furyl) methyleneamino] phenol (2MFMAP) turned to poly-4-[(5-methyl-2-furyl) methyleneamino] phenol (P-4MFMAP) and poly-2-[(5-methyl-2-furyl) methyleneamino] phenol (P-2MFMAP) polyazomethine derivatives by NaOCl oxidant in alkaline aqueous medium. In addition, poly-2-[(5-methyl-2-furyl) methyleneamino] phenol cobalt (II) and copper (II) complexes were synthesized. FTIR and NMR measurements for structural analysis of the synthesized compounds, UV–Vis analysis for optical properties, electrical conductivity measurements, and thermal analysis with the TG–DTA techniques were determined. The yield of P-4MFMAP and P-2MFMAP was found to be 84.6% and 78.6 as follows [4MFMAP] = 0.066, [KOH] = 0.198 [NaOCl] = 0.066 mol L?1 at 60 °C for 3 h and [2MFMAP] = 0.066, [KOH] = 0.132 [NaOCl] = 0.066 mol L?1 at 70 °C for 3 h, respectively. 相似文献
78.
Sadin Özdemir M. Kadir Oduncu Ersin Kılınç Mustafa Soylak 《Journal of Radioanalytical and Nuclear Chemistry》2018,315(2):185-193
Bacillus vallismortis and Bacillus mojavensis were loaded onto Amberlite XAD-4 resin and used for solid phase extraction (SPE) of uranium(VI). A quick and simple UV–Vis spectrophotometric method was used to determine U(VI) ion. The best experimental conditions were determined as being a pH of 5.0; a sample flow rate of 2.0 mL min?1; 200.0 mg of biosorbent; 800 mg of Amberlite XAD-4, and 5.0 mL of 1 mol L?1 HCl as desorption solution for both immobilized bacteria. The preconcentration factors were achieved as 80 for both solid phase extractor. The developed methods were validated by applying to reference water and tea samples. 相似文献
79.
80.
This paper describes the production of selenium sulfide (SeS2) crystalline thin film on commercial glass substrates, via chemical bath deposition. Transmittance, absorption, dielectric constant and refractive index of the produced films were investigated by UV/VIS Spectrum. It was found that changes occurred on the characteristics of the films and they were determined as a function of selenium sulfide concentration, which varied between 2?×?10?3 and 5?×?10?3 M. The structure of the film was analyzed using FTIR spectrum. The calculated refractive index values fell between 1.5 and 1.6, whereas the transmission ratio of the films was around 80–90%. Moreover, a peak in the reflectance was observed at 320–330 nm for all investigated samples. The highest dielectric constant for the films was obtained at the deposition concentration of 0.005 M. This study is believed to be useful for thin film production. 相似文献