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排序方式: 共有116条查询结果,搜索用时 15 毫秒
91.
Mehmet Fatih Cengiz Onder Turan Durmus Ozdemir Yalçın Albayrak Fatih Perincek Halil Kocabas 《International Journal of Food Properties》2017,20(12):3234-3243
In this study, stable isotope signatures (δ13C, δ15N, and δD) of both tea leaves and tea infusions were investigated to identify the geographical origin of Turkish domestic and imported tea samples. Sixteen domestic tea samples collected from different locations in the Black Sea Region, which produces almost 100% of tea in Turkey, and 11 imported tea samples (Kenya, India, Sri Lanka, Indonesia, and China) purchased from importers were studied. δ13C, δ15N, and δD in the samples were determined using isotope ratio mass spectrometry (IR-MS). δ13C in the samples ranged from ?29.18 ± 0.01 to ?25.7 ± 0.2, while δ15N ranged between 1.1 ± 0.2 and 5.2 ± 0.8. However, δD in the samples were found to be in the range from 56.5 ± 0.3 to 72 ± 1. The classifications of the tea samples into domestic and imported tea samples were achieved with 100% accuracy using multivariate statistical analyses (principal component analysis, PCA, and hierarchical cluster analysis, HCA). In conclusion, the domestic tea samples had a distinctive isotopic fingerprint and the isotopic ratios used in the study can be significant predictors in determination of the geographical source of Turkish tea. 相似文献
92.
T. Leslie Youd Daniel W. DeDen Jonathan D. Bray Rodolfo Sancio K. Onder Cetin Travis M. Gerber 《Canadian Metallurgical Quarterly》2009,135(1):46-61
Three potential lateral spreads exhibited negligible displacements during the 1999 Kocaeli, Turkey Earthquake (Mw = 7.5) even though they were located within 7?km of the fault rupture. These spreads are analyzed to verify and augment current procedures for predicting liquefaction resistance and lateral spread displacement. The sites include ?ark Canal and Cumhuriyet Avenue in Adapazari, underlain by fine-grained sediment, and Degirmendere Nose adjacent to Izmit Bay, a steeply sloping area underlain by moderately dense silty sand. The plasticity index and moisture content criteria of Bray and Sancio set forth in 2006 indicate that much of the fine-grained sediment is liquefiable. Even though liquefaction likely occurred, lateral spreading did not occur due either to the dilative nature of fine-grained, sandlike sediments or the inherent strength of claylike sediments. Corrected blow counts, (N1)60, in moderately dense sand at Degirmendere Nose range from 15 to 25 blows/30?cm, indicating that liquefaction should have occurred but that the silty sand was too dense and dilative to deform. This finding is consistent with the MLR procedure of Youd et al. set forth in 2002 that identifies liquefiable sands with (N1)60 greater than 15 blows/30?cm as resistant to lateral spread during earthquakes with M<8. 相似文献
93.
T Karl K Onder R Kodzius A Pichová H Wimmer A Th r H Hundsberger M L?ffler T Klade A Beyer M Breitenbach L Koller 《Canadian Metallurgical Quarterly》1999,34(6):419-429
The yeast gene, GRC5 (growth control), is a member of the highly conserved QM gene family, the human member of which has been associated with the suppression of Wilms' tumor. GRC5 encodes ribosomal protein L10, which is thought to play a regulatory role in the translational control of gene expression. A revertant screen identified four spontaneous revertants of the mutant grc5-1ts allele. Genetic and phenotypic analysis showed that these represent one gene, NMD3, and that the interaction of NMD3 and GRC5 is gene-specific. NMD3 was previously identified as a component of the nonsense-mediated mRNA decay pathway. The point mutations within NMD3 reported here may define a domain important for the functional interaction of Grc5p and Nmd3p. 相似文献
94.
The present paper deals with the hydrogen liquefaction with absorption precooling cycle assisted by geothermal water is modeled and analyzed. Uses geothermal heat in an absorption refrigeration process to precool the hydrogen gas is liquefied in a liquefaction cycle. High-temperature geothermal water using the absorption refrigeration cycle is used to decrease electricity work consumption in the gas liquefaction cycle. The thermoeconomic optimization procedure is applied using the genetic algorithm method to the hydrogen liquefaction system. The objective is to minimize the unit cost of hydrogen liquefaction of the composed system. Based on optimization calculations, hydrogen gas can be cooled down to ?30 °C in the precooling cycle. This allows the exergetic cost of hydrogen gas to be reduced to be 20.16 $/GJ (2.42 $/kg LH2). The optimized exergetic cost of liquefied hydrogen is 4.905 $/GJ (1.349 $/kg LH2), respectively. 相似文献
95.
Clean Technologies and Environmental Policy - This study addresses to rank the environmental performance of manufacturing sectors using Preference Ranking Organization Method for Enrichment... 相似文献
96.
The present study undertakes an exergy analysis of earth to air heat exchanger (EAHE) and applies to a local one in Turkey. Namely, the exergy performance of an EAHE has been evaluated in a demonstration in Solar Energy Institute of Ege University, Izmir, Turkey. Exergetic efficiencies of the system components are determined as an attempt to assess their individual performances. The daily maximum heating coefficient of performance (COP) value for the system is obtained to be 6.18. The total average COP in the experimental period is found to be 4.74. 相似文献
97.
98.
MY Suleiman AN Passannante RL Onder WF Greene-Helms SG Perretta 《Canadian Metallurgical Quarterly》1997,84(5):1076-1080
The cardiovascular consequences of epidural anesthesia secondary to sympathetic blockade are well documented; however, their repercussions on renal hemodynamics in humans have not been reported. We investigated the effect of epidural anesthesia on renal blood flow (RBF) in 13 healthy volunteers 18-45 yr of age. RBF was measured using paraaminohippurate clearance before and after bilateral T6 epidural sensory block (to ensure adequate sympathetic renal nerve blockade). Epidural anesthesia was established using 22 +/- 3 mL of 2% plain lidocaine (without epinephrine) via L1-L2 epidural catheter; urine output was measured using a three-way Foley catheter. Mean arterial pressure remained > or = 70 mm Hg in all subjects without any pharmacologic intervention. Mean RBF before epidural anesthesia was 16.1 +/- 6.8 mL.kg-1.min-1 and 14.3 +/- 2.9 mL.kg-1.min-1 after bilateral T6 epidural blockade. We conclude that the institution of epidural anesthesia in healthy subjects does not result in a significant change in RBF (P > 0.25). 相似文献
99.
A graft copolymer of polyisobutylene with poly(methyl methacrylate) [PMMA] was prepared containing naphthalene [N] groups statistically distributed along the PMMA backbone. Fluorescence studies of dilute solutions of the polymer in ethyl acetate showed small amounts of N-excimer emission when the NMA/MMA ratio was 1:9, and undetectable excimer when the ratio was 2/98. Energy transfer experiments were carried out between polymer-bound naphthalene and anthracene [A] added to the solution. The rate constant for energy transfer, kET, for the process N* + A → N + A* was found to be 1.1 × 1010 M−1 s−1 at 22°, slightly smaller than that (1.2 × 1010 M−1 s−1) for energy transfer from naphthylmethyl pivalate to A. From the value of the rate constants, a value for the segmental diffusion coefficient of polymer bound naphthalene was calculated. 相似文献
100.
Liquefaction-Induced Lateral Spreading at Izmit Bay During the Kocaeli (Izmit)-Turkey Earthquake 总被引:1,自引:0,他引:1
K. Onder Cetin T. Leslie Youd Raymond B. Seed Jonathan D. Bray Jonathan P. Stewart H. Turan Durgunoglu W. Lettis M. Tolga Yilmaz 《Canadian Metallurgical Quarterly》2004,130(12):1300-1313
This paper presents a study of liquefaction-induced lateral ground displacements along the coast of Izmit Bay during the 1999 Kocaeli (Izmit)-Turkey earthquake. The paper discusses: (1) observed ground displacements after the earthquake, (2) the results of field investigations by means of borings and in situ index tests, including standard penetration tests, static cone penetration tests, and piezocone tests, (3) analyses of expected lateral displacements using two empirical models and one semiempirical model, and (4) comparisons between observed and calculated lateral ground movements. The three models provide inconsistent predictions of observed lateral ground displacements, with one method overpredicting and two methods both overpredicting and underpredicting observed lateral ground displacements by large amounts. Thus, it appears that there is a need for improved engineering tools for prediction of small to moderately significant lateral ground displacements (lateral displacements of approximately 0.1–2.5?m) at soil sites with similar ground characteristics to the case history sites presented herein. 相似文献