196,122 research outputs found
A different distribution area of Ispir Oak: Hınzır Mountain (Akkışla-Kayseri)
No full textTürkiye gerek tür zenginliği gerekse yaklaşık 6 milyon hektar meşe orman varlığıyla dünyanın sayılı ülkelerinden biridir. Türkiye’de doğal olarak yetişen 18 meşe türü ve bu türlerden 6 tanesinin 11 alt türü bulunmaktadır. Bunlardan Quercus vulcanica, Quercus macranthera subsp.syspirensis, Q.trojana subsp.yaltirikii endemik meşe türleridir. Meşe türleri içinde endemik bir alt tür olan İspir meşesi (Quercus macranthera subsp.syspirensis), Türkiye’nin Avrupa-Sibirya fitocoğrafya bölümleri içerisinde yer almaktadır. Bu tür Anadolu’nun kuzeyinde Karadeniz Bölgesi, İç Anadolu Bölgesi’nin kuzeyi ve Doğu Anadolu Bölgesi’nin kuzey yarısında 1000-2250 m yükseltileri arasında yayılış gösterir. Mevcut bitki coğrafyası literatüründe İspir meşesinin Türkiye’deki doğal yayılış alanları içerisinde Erciyes Dağı üzerinde bulunduğu belirtilmektedir. İspir meşesinin Kayseri ilinin diğer yerlerinde varlığı bilinmemektedir. 2018 yılında Kayseri ilinin Akkışla İlçesi Ortaköy idari sınırları içinde Hınzır Dağı kuzeybatı yamacında yapılan arazi çalışmaları esnasında İspir meşesinin topluluk oluşturduğu görülmüştür. Burada 1600-1800 m yükselti basamakları arasında yayılış gösterir. İspir meşesi topluluğu çalı ve ağaççık formuna sahip olup, toprak tabakasının zayıflığı ve çeşitli beşerî etkenlerden dolayı hayatta kalma mücadelesi vermektedir. Bu çalışma, daha önce hakkında detaylı araştırma yapılmamış İspir meşesinin Hınzır Dağı’ndaki doğal yayılışını konu almaktadır. Böylece bu türün Türkiye’de doğal yayılışı ile ilgili bilgilere katkı sağlanması amaçlanmaktadır
Physico‐mechanical seed properties of the common Turkish bean (<i>Phaseolus vulgaris</i>) cultivars ‘Hinis’ and ‘Ispir’
No full textThe objective of this study was to determine the geometrical, gravimetrical, frictional, aerodynamic, colour, and mechanical properties of two common bean (Phaseolus vulgaris) cultivars 'Hinis' and 'Ispir', which dominate bean production in Erzurum, Turkey. The average length, width, thickness, geometric mean diameter, sphericity, and projected area were found to be: 11.76 and 12.29 mm, 8.85 and 9.10 mm, 7.66 and 7.99 mm, 78.90 and 78.45%, and 92.02 and 99.37 mm(2) for 'Hinis' and 'Ispir', respectively. The average 1000 seed weight, bulk density, and porosity were determined as: 531.3 and '598.9 g, 835.8 and 872.7 kg m(-3), and 34.0% and 33.1% for 'Hinis' and 'Ispir', respectively. The average angle of repose and terminal velocity were 24.52 degrees and 19.46 degrees, and 11.42 and 11.80 m s(-1) in 'Hinis' and 'Ispir' respectively. The highest coefficient of dynamic friction was obtained with an aluminium surface in both cultivars as 0.227 for 'Hinis' and 0.199 for 'Ispir'. This was followed by fibreglass, steel, plywood, and glass surfaces. Both cultivars had white testae. The average value of rupture force, deformation at rupture point, energy absorbed, hardness, and toughness; along the X-direction were found to be: 145.9 and 118.4 N, 0.85 and 0.90 mm, 63.8 and 54.0 N mm, 171.0 and 132.5 N mm(-1), and 0.15 and 0.12 mJ cm(-3) for 'Hinis' and 'Ispir', respectively
Selected Properties of Polyphenol Oxidase Obtained from Ispir Sugar Bean
No full textPolyphenol oxidase enzyme was isolated from Ispir sugar bean by ammonium sulphate precipitation and its biochemical properties were investigated. For this purpose, K-M and V-max values for optimum conditions of pH, temperature, and ionic strength were determined for catechol, catechin, and chlorogenic acid as substrates. Enzyme activities were measured spectrophotometrically at 420 nm using the same substrates at optimum conditions. K-M values were found to be 2.4875, 1.3154, and 2.2487 M for catechol, catechin, and chlorogenic acid, respectively. V-max values were 3.1480, 0.6130, and 0.5039 EU/ml.min for the same substrates, respectively. These results indicated that catechol was used as a subsrate for inhibition studies. For catechol substrate, dithiothreitol, glutathione, thiourea, and L-cysteine chlorid were inhibitors. For these inhibitors, K-i constants were calculated from Lineweaver-Burk plots and inhibiton types were estimated. Moreover, I-50 values were also determined. The most effective inhibitor was found to be glutathione
Feasibility of Bolted Connectors in Hybrid FRP-Steel Structures
No full textDue to the low weight and excellent durability of composite materials, Fibre Reinforced Polymer (FRP) decks mounted on steel superstructures are becoming all the more common in engineering practice. Bolted joints are generally used to facilitate connections between an FRP deck and steel girders in road bridges. The connections are subjected to both high magnitude static forces as well as fatigue loading due to overpassing vehicles. With ever increasing traffic on both road and railway bridges, fatigue performance is of critical concern. Bolted FRP joints have been extensively researched in the past under static loading, but less is known about the fatigue and creep behaviour of such joints. Furthermore, little research exists on non-pultruded FRP profiles connected using bolted connections. Therefore, the objective of this research is to investigate connectors’ feasibility by means of static, fatigue and creep experiments on four different types of bolted joints comprising mechanical connectors and injection techniques. The study focuses on application in vacuum infused GFRP panels with integrated webs made of multi-directional laminates, connected to steel bridge superstructures. In addition, experimental results are validated by Finite Element Analyses (FEA). Based on the obtained results, the novel injected steel-reinforced resin (iSRR) connector developed at TU Delft shows promising potential in hybrid steel-FRP bridges where good fatigue endurance of the connection and local loads in FRP panel, are required.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Steel & Composite Structure
Shear Force in Bolted Connection Due to Traffic and Temperature Loads in Hybrid Steel-FRP Bridges
No full textAs many bridges are reaching the end of their service life, researchers are searching for new solutions to extend the lifespan of those bridges. Fibre reinforce polymers (FRP) could be possible a solution for bridges with deck problems. Lightweight FRP decks can be installed quickly via bolted connectors on steel substructure. In general, shear force in the connector is not taken into account during the design of FRP decks because slip behaviour and interaction with steel substructure is unknown. This research connects to research at TU Delft on non-slip shear connectors for FRP decks. Aim of this paper is to quantify shear forces in bolted connectors due to traffic and temperature loads. The direction of webs, fibres in panel facings and the expansion coefficient of resin has been investigated to determine the influence of the FRP deck on the shear force in the connectors. To investigate the results of traffic loading and temperature loading on real bridges, a database of bridges in the Netherlands has been used. Results from the analyses offer an indication of the influence of the laminates on the shear force in the connectors and show shear force ranges that can occur in existing bridges.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Steel & Composite Structure
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States" By M. Carey.
No full text"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States: containing bried sketches of the moral and political character of those states.
By M. Carey, member of the American philosophical, and of the American Antiquarian Society, and author of The Olive Branch, Cindiciae Hibernicae, essays on banking, on political economy, and on internal improvement.
To which are now added the English editor's comments on the subject; together with Important Advice to Emigrants, and Cautions Against Impositions Practiced in the Outports
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Dr. Glendon Swarthout
No full textHosted by Roger M. Busfield, MSU Assistant Professor of Speech and Theater, Meet the Author is designed to introduce a general audience to a contemporary author and their work through in-depth interviews. This episode features a conversation between Dr. Glendon Swarthout, prolific author and English professor at MSU, and assistant professors Sam S. Baskett and Theodore B. Strandness
Simulation of thermal plant optimization and hydraulic aspects of thermal distribution loops for large campuses
No full textFollowing an introduction, the author describes Texas A&M University and its utilities system. After that, the author presents how to construct simulation models for chilled water and heating hot water distribution systems. The simulation model was used in a $2.3 million Ross Street chilled water pipe replacement project at Texas A&M University. A second project conducted at the University of Texas at San Antonio was used as an example to demonstrate how to identify and design an optimal distribution system by using a simulation model. The author found that the minor losses of these closed loop thermal distribution systems are significantly higher than potable water distribution systems. In the second part of the report, the author presents the latest development of software called the Plant Optimization Program, which can simulate cogeneration plant operation, estimate its operation cost and provide optimized operation suggestions. The author also developed detailed simulation models for a gas turbine and heat recovery steam generator and identified significant potential savings. Finally, the author also used a steam turbine as an example to present a multi-regression method on constructing simulation models by using basic statistics and optimization algorithms. This report presents a survey of the author??s working experience at the Energy Systems Laboratory (ESL) at Texas A&M University during the period of January 2002 through March 2004. The purpose of the above work was to allow the author to become familiar with the practice of engineering. The result is that the author knows how to complete a project from start to finish and understands how both technical and nontechnical aspects of a project need to be considered in order to ensure a quality deliverable and bring a project to successful completion. This report concludes that the objectives of the internship were successfully accomplished and that the requirements for the degree of Degree of Engineering have been satisfied
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