Manisa Celal Bayar Üniversitesi Akademik Arşiv Sistemi
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Thermodynamic Performance Evaluation of Concentrating Solar Collector with Supercritical Carbon Dioxide (sCO2) Base Nanofluids
No full textThe use of supercritical carbon dioxide as a working fluid is an important alternative to enable the use of parabolic collectors in the high-temperature applications field. In the present paper, the effects of carbon black nanoparticles dispersed in supercritical carbon dioxide (sCO(2)) base fluid on the energetic and exergetic performance of parabolic trough collectors are theoretically investigated. Thermal modeling and performance analyses are performed through the developed model in the Engineering Equation Solver software. To present operating conditions of the system, all working fluids are tested under a pressure of 80 bar at a mass flow rate of 1.1 kg/s. In these analyses, the fluid inlet temperature, ambient temperature, and nanofluid concentration are determined as the variable indicators. Up to approximately working fluid inlet temperature of 705 K, the exergy efficiencies of the concentrating collectors using the sCO(2) nanofluids are higher than that of the concentrating collector using the sCO(2) base fluid. Additionally, the exergy efficiency increases in the systems using nanofluids with 2% and 4% concentration ratio are between 0.34-6.96% and 0.49-11.44%, respectively, according to the system using base fluid. Besides, at the working fluid inlet temperature values greater than 705 K, the exergy efficiency of the collector of using the sCO(2) working fluid is found higher than the collectors using the nanofluids. However, at the same working fluid inlet temperatures, the fluid outlet temperatures of the collectors with the sCO(2) nanofluids are higher than the system with sCO(2) working fluid
A CANDIDATE INDENTIFICATION QUESTIONNAIRE FOR PATIENTS WITH POSTMENOPAUSAL OSTEOPOROSIS SWITCHED FROM TREATMENT WITH A DIALY OR WEEKLY BISHPOSPHONATE TO ONCE-MONTHLY IBANDRONATE-BONCURE: RESULTS OF TURKISH SUB-STUDY
No full textQUALITY OF LIFE IN BENIGN PROSTATIC HYPERPLASIA
No full textIntroduction: In view of the growing tremendous interest in quality of life (QoL) in almost every field of medicine, the scope of this review was to address the place of QoL in benign prostatic hyperplasia (BPH) in terms of selecting appropriate treatment policy. Actually, the target of any proposed treatment for BPH is usually the symptoms of the patient. Therefore, it is more logical to know the status of QoL related to these symptoms for each particular patient in order to provide the most appropriate treatment. Since contemporary measures like symptom scores do not measure BPH specific QoL, they should not solely guide the physician in suggesting a treatment alternative for a BPH patient. In this review, QoL in BPH was discussed including present data and future perspective
Could the Inflammatory Prognostic Index Predict the Efficacy of Regorafenib in Patients with Metastatic Colorectal Cancer?
No full textPurpose To investigate the clinical importance of the inflammatory prognostic index (IPI) in patients with metastatic colorectal cancer treated with regorafenib. Methods A retrospective analysis of 65 metastatic CRC patients treated with regorafenib between 2015 and 2020 was performed. The association between NLR, PNLR, IPI, and overall survival (OS) and progression-free survival (PFS) was evaluated. Results According to the cut-off points, patients were divided into two groups. The patients in the high IPI group showed poorer OS compared to patients in the low IPI groups. The PFS was better in patients with low neutrophil-lymphocyte ratio (NLR) and platelet-neutrophil to lymphocyte ratio (PNLR), and the OS was better in patients with low IPI. Conclusion Among the immune inflammation scores analyzed in mCRC patients receiving regorafenib, NLR and PNLR were the best predictor of recurrence, whereas IPI was the best predictor of long-term survival. After being confirmed by better designed controlled trials, IPI can be used to identify the group of patients who will benefit more from regorafenib treatment
Elasto-plastic stress analysis of aluminum metal-matrix composite laminated plates under in-plane loading
No full textThe study presents an elasto-plastic stress analysis of symmetric and antisymmetric cross-ply, angle-ply laminated metal-matrix composite plates. Long stainless steel fiber reinforced aluminum metal-matrix composite layer is manufactured by using moulds under the action of 30 MPa pressure and heating up to 600 degrees C. A laminated plate consists of four metal-matrix layers bonded symmetrically or antisymmetrically. The first-order shear deformation theory and nine-node Lagrangian finite element is used. The in-plane load is increased gradually. (C) 2000 Elsevier Science Ltd. All rights reserved
Effects of plastic covering on yield, physical and chemical characteristics of some table grapes (Vitis vinifera L.)
No full textThis study was aimed to determine the effect of plastic covering on phenological stages (bud-burst, blooming, verasion, ripening) and the physical characteristics (the yield, cluster weight, cluster length, cluster width, berry weight, berry length, berry width, berry rupture point force, shoot weight, shoot length) as well as the chemical characteristics (total soluble solids, titratable acidity and sugar fractions) of Cardinal, Yalova Incisi and round seedless grape cultivars. The trial were planed as a plastic greenhouse for each variety. The greenhouse, including three lines of the vines were covered by 5.0 m in height and 8.0 m in width with UV and IR type of polyethylene, from mid-February to mid-April. Side lines were ignored due to the border effect and only middle lines of the vines were statistically analyzed by t-test for paired plots
Air stable N-heterocyclic carbene silver complexes: synthesis, characterization, and antibacterial activity
No full textA new benzimidazolium salt containing a 2,5-dimethylbenzyl substituent and six N-heterocyclic carbene (NHC) silver complexes were prepared. The complexes were characterized by NMR, FTIR, and LC-MS spectroscopic methods and elemental analyses. They are stable in solution for a week. The antibacterial properties of the Ag(I) complexes against two Gram-positive and two Gram-negative bacteria were investigated. Inhibition zone and minimum inhibitory concentration (MIC) data establish that these NHC-Ag(I) complexes possess antibacterial activities; 2b showed the highest antibacterial activity overall against Gram-positive and Gram-negative bacteria
Optimization of ultrasound-assisted extraction of antioxidant compounds from Rumex hastatus with response surface methodology
No full textRumex hastatus is known for its nutritional and pharmacological properties. The present research explored ultrasound-assisted extraction (UAE) for antioxidants from it. Response surface methodology (RSM) was used with the Box-Behnken design. Hydro-ethanolic solvent ratio, amplitude, and temperature were the independent factors while % extraction yield, total phenolic content (TPC), total flavonoid content (TFC), antioxidant potential, and metal chelating activity (MCA) were the responses. The highest extraction yield was 11.58% that was obtained at 20% hydro-EtOH, 50celcius temperature, and 50 m amplitude. The optimum conditions for the highest TPC were 80% hydro-EtOH, 60celcius temperature, and 75 m amplitude, for the highest TFC were 80% hydro-EtOH, 50celcius temperature, and 50 m amplitude. For MCA, the optimum conditions were 20% hydro-EtOH solvent, 50celcius temperature, and 100 m amplitude, respectively. UAE proved to be an efficient green technique for the extraction of bioactive and antioxidant substances from R. hastatus. Practical applications The findings of this study are important for experts and industries related to vegetables and their antioxidant substances. The optimization work will be useful for the development of an efficient method for extraction of bioactive natural products from this plant for large-scale production
Comparative study and hybrid modeling approach with POD for convective drying performance of porous moist object with multi-impinging jet and channel flow configurations
No full textComparative studies for convective drying performance of a porous moist object in channel flow and with multiimpinging jet flow configuration are performed with finite element method. The analysis is conducted for different Re numbers (between 100 and 300), hot inlet temperature (between 50 and 80 degrees C), porous moist object size (between w and 3.5w) and jet flow arrangement parameters in unsteady configuration for times up to 1000 min. Flow re-circulations and isotherms within the channel and jet flow arrangement vary with Re number, size of the object and jet flow parameters. The moisture reduction (MR) becomes higher for the jet flow arrangement and higher Re number while at Re = 300, its value is 59.66%. Increasing the hot air inlet temperate resulted in increment of MR by about 17.5% for multi-impinging jet flow configuration while it is only 10% for channel flow arrangement. There is nearly 20% deviation in the MR value when cases with porous moist object with the lowest and highest size are compared. The vertical distance between the inlet jets to the porous object becomes more effective on the convective drying performance when compared to horizontal distance in between the jets while the MR values reduces from 61% to 48.5% when configurations with lowest and highest vertical distances are considered. An efficient hybrid model with proper orthogonal decomposition (POD) is proposed for efficient computations of convective drying. The computational cost for one case is reduced from 1.3 h for fully coupled high fidelity computational fluid dynamics simulations to 0.1 h with the proposed hybrid approach. The method is also flexible to handle complex external flow configurations and will be more efficient in 3D simulation case
