88 research outputs found

    Analysis of precipitation datas by Mann Kendall and Sperman's Rho rank correlation statistical approaches in Nevsehir Province of Turkey

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    In this research, the total and maximum precipitation values of long years (1970-2019) of Nevşehir province, Ürgüp districts and 34 years of Avanos 1986-2019 were subjected to the Mann Kendall and Sperman's Rho rank correlation tests. In this study; Change trends of the precipitation are presented with graphic distrubitions. According to the results of the trend analysis, it has been observed that the average maximum precipitation value for long years in Avanos district, Nevsehir Province and Ürgüp district is 9,1 mm, 11,3 mm, 10,7 mm and average total precipitation is 292,8 mm, 362,9 mm, 326,9 mm respectively. According to the results of maximum precipitation trends, it has been observed that there is a significant increase in Nevşehir province and Ürgüp districts in winter and autumn months. Considering the total precipitation distribution, it is concluded that there is a negative trend in the spring and autumn seasons in Nevşehir province and Ürgüp district

    Evaluation with trend analysis of the open surface evaporation in observed for many years: The Case Study in Nevsehir Province of Turkey

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    In this study, the trends of the climate station belonging to the Turkish General Directorate of Meteorology in the center of Nevsehir province of Turkey between 2001-2019 years were subjected to the Rho’s correlation tests of Mann Kendall and Sperman for years of maximum open surface evaporation and total open surface evaporation. According to the results of the trend analysis, the maximum open surface evaporation was 59,7 mm and the total open surface evaporation was calculated as 1013,2 mm in the center of Nevsehir Province over long period. It was observed that the average maximum temperature value was 24 oC for long years and the total precipitation average was 363,6 mm. It was observed that there was a significant increase in open surface evaporation values varying in years in spring, winter and autumn. According to the trend analysis results made for many years, a trend was not observed in the Maximum and total open surface evaporation parameters in Nevsehir province of Turke

    Evaluation of The Number of Rainy Days Observed for Long Years Due to Global Climate Change in Nevşehir /Turkey

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    In this research caried out Nevsehir province, Avanos and Ürgüp districts of Turkey's Central Anatolia Nevsehir. In the study, it is aimed to reveal the trends of years by changing the number of long year total rainy days by Mann Kendall and Sperman's Rho correlation tests. Within the scope of the study, 34 years long total monthly rainy days data between 1986-2019, which were obtained from automatic meteorology stations, were evaluated. According to the results of the trend analysis, the average total number of rainy days in Nevşehir province was 77 days minimum, the maximum number of rainy days was 142 days, and the average of the average number of rainy days was 109 days. In Avanos district, the average number of rainy days for a long time was 57 days, and the maximum number of rainy days was 129 days, while the average of the number of rainy days for long years was 89 days. In Ürgüp district, the average number of rainy days for a long time was 65 days, the maximum number of rainy days was 129 days, and the average of the number of rainy days for long years was 95 days. As a result, considering the number of long year rainy days, it is concluded that there is no significant trend in Nevşehir province, Avanos and Ürgüp district stations

    Regio- and Stereoselective Aminopentadienylation of Carbonyl Compounds

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    A simple and robust protocol is detailed for the preparation of enantioenriched α-substituted (1,4-pentadien-3-yl)amine derivatives. The methodology involves the addition of an in situ formed pentadienyl indium reagent to chiral tert-butylsulfinimines, previously formed in the same pot. The addition takes place with excellent γ-regio- and diastereoselectivity for a wide range of carbonyl compounds, including α-unsubstituted aldehydes and methyl alkyl ketones. The catalytic hydrogenation of the sulfinamines obtained provides a convenient access to chiral α-substituted (3-pentyl)amines. The hydroboration–oxidation of the α-(1,4-pentadien-3-yl)amine derivatives, followed by a cyclization under Mitsunobu conditions, takes place with an excellent diastereoselectivity governed by the chiral sulfinyl group.We thank the Spanish Ministerio de Ciencia e Innovación (CTQ2011-24165) for financial support. I.B. acknowledges the Generalitat Valenciana for a predoctoral fellowship (ACIF/2011/159). E.B. acknowledges the Council of Higher Education- Turkey for a postdoctoral fellowship (16.10.12-B.09.6.YÖK.0.71.01-207.02-12285)

    STRUCTURAL ENGINEERING AND MECHANICS

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    In this study, linear vibrations of an axially moving beam under non-ideal support conditions have been investigated. The main difference of this study from the other studies; the non-ideal clamped support allow minimal rotations and non-ideal simple support carry moment in minimal orders. Axially moving Euler-Bernoulli beam has simple and clamped support conditions that are discussed as combination of ideal and non-ideal boundary with weighting factor (k). Equations of the motion and boundary conditions have been obtained using Hamilton's Principle. Method of Multiple Scales, a perturbation technique, has been employed for solving the linear equations of motion. Linear equations of motion are solved and effects of different parameters on natural frequencies are investigated

    PAMUKKALE UNIVERSITY JOURNAL OF ENGINEERING SCIENCES-PAMUKKALE UNIVERSITESI MUHENDISLIK BILIMLERI DERGISI

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    In this study, linear vibration analysis of a nanobeam conveying fluid is investigated under simple-simple and clamped-clamped boundary conditions. Eringen's nonlocal elasticity theory is applied to Euler-Bernoulli beam model. Nonlocal elasticity theory is a popular growing technique for the mechanical analyses of MEMS and NEMS structures. The Hamilton's principle is employed to derive the governing equations and boundary conditions. Non-dimensional form of equations is obtained. The obtained equations of motion and boundary conditions are independent from material and geometric structure. It is assumed that fluid velocity is harmonically changed about a constant average speed. Approximate solutions were obtained using the Method of Multiple Scales, a perturbation method. The first term in perturbation series composes linear problem. Natural frequencies and mode shapes are calculated by solving the linear problem for different boundary conditions. For both boundary conditions, the natural frequencies are decreased by increasing the nonlocal parameter (gamma)and the fluid velocity (nu(0)). The results are presented and interpreted by graphics

    JOURNAL OF FOOD SCIENCE AND TECHNOLOGY-MYSORE

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    In this study, the effects of different fat levels and different particle sizes on compositional and structural characteristics of probiotic fermented sausage were investigated. In order to obtain probiotic character, Lactobacillus casei CRL431 was added. The physicochemical, microbiological and sensory analysis were done. The effect of fat level x mincer hole diameter interaction on hardness values were statistically significant (p < 0.005). At the end of the fermentation-ripening period, L.casei CRL-431 count has reached to sufficient microbial count (10(6) cfu/g of probiotic bacteria) to demonstrate the character of probiotic food. A significant positive correlation was found between L.casei CRL431 count and surface appearance, texture and overall acceptability scores (r = 0.60, 0.52, 0.53). The values of TBARS number of probiotic sucuk samples increased during fermentation-ripening. A significant correlation between taste-aroma scores and fat level was detected (r = -0.61,p = 0.0008). Consiquently, the best sensorial quality was determined in L3 samples and the worst sensorial quality was determined in H8 samples

    CYTA-JOURNAL OF FOOD

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    The objective of the present study was to investigate the effects of different packaging methods and storage time on the quality and shelf life extension of beef steaks (M. longissimus dorsi). Steaks were packed under air (control), vacuum, MAP1 (60:40/O-2:CO2) and MAP2 (60:20:20/O-2:CO2:N-2) conditions. Packed steak samples were stored at 4 +/- 1 degrees C for 35 days. Physical, chemical (headspace gas analysis, weight loss, water holding capacity, Warner-Bratzler shear force, instrumental color measurement, pH, thiobarbituric acid reactive substances (TBARS), myoglobin content) and sensory color analyses were performed. It was determined that vacuum packaging reduced the weight losses during the storage. In terms of sensory color evaluation, the best results were observed in vacuum packed samples. TBARS values were increased in all samples during the storage time. In terms of lipid oxidation level, it was defined that vacuum packed samples might provide the longest shelf life. Interaction of packaging method and storage time affected the shear force values significantly (P < 0.001). The interaction of packaging method and storage day affected the L*, a*, b* values of the beef steaks significantly (P < 0.001)

    Fuzzy logic-based life-cycle cost analysis of road pavements

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    Life-cycle cost analysis (LCCA) is a decision-making mechanism that can be used to determine the best road pavement option. It is prevalently applied by transport authorities. However, the effect of uncertainty that stems from the nature of the analysis is a drawback in making a proper decision because it can trigger subjectivity in decision making. Although probabilistic methods are used to overcome this problem, the large amount of data required is a disadvantage that affects the usability of such methods. This study uses the fuzzy logic technique because of the popularity of its successful analyses in decision-making problems. Among the fuzzy logic extension principles, the vertex method and the Dong, Shah, andWong (DSW) algorithm are applied in the LCCA of road pavements. The steps of the methods are described in detail. As part of the study, a model involving a traditional probabilistic method is compared with a model based on fuzzy logic by means of a case study. Results reveal that fuzzy logic-based LCCA is a promising alternative approach for transport authorities, especially for highway agencies, in making a final decision on the type of road pavement to use. © 2018 American Society of Civil Engineers
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