Wyniki wyszukiwania - Biblioteka Nauki

Ten serwis zostanie wyłączony 2025-02-11.

Nowa wersja platformy, zawierająca wyłącznie zasoby pełnotekstowe, jest już dostępna.
Przejdź na https://bibliotekanauki.pl

Ograniczanie wyników

Znaleziono wyników: 4

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Growth characteristics and reproduction of comber, Serranus cabrilla (Actinopterygii, Perciformes, Serranidae), in the Aegean Sea

100%

Ilhan D. , Akalin S. , Tosunoglu Z. , Ozaydin O.

tom 40

nr 1

Background. Even though Serranus cabrilla has been a by-catch species in trawling operations, it is now becoming an economically important fish species on the Turkish Coast of Aegean Sea, because of its low market price. For an efficient fisheries management of the stocks it is important to know important biological parameters of the commercially exploited species. Therefore the aim of this study was to obtain necessary growth- and reproductive characteristics of comber representing the local population of this fish in the study area. Materials and Methods. Biological aspects of comber were examined based on a total of 1452 specimens collected from the Aegean Sea, during the period January 2005–December 2005. Age of fish was determined by otolith reading. Length–weight relation and the von Bertalanffy equation were used to evaluate the fish growth. Results. Annuli on otoliths indicated the presence of 6 age classes. The computed growth parameters were: L∞= 23.88 cm; k = 0.298 year–1 and t0= –1.577 year. The length–weight relations were calculated as:W= 0.0111 · L2.998 for sex combined. The growth performance index (Φ′) was 2.230. The fish mature sexually for the first time at a total length of 13.20 cm (L50). The spawning season of comber was from March to May, with a peak in April. Conclusion. The comber grows rapidly attaining almost 75% of its linear growth during the first two years of life and then the growth slows down. The growth coefficient, (k), indicates slow attainment of maximum size because of significantly correlated to temperature of sea water, leading to a considerable variability in the life span between areas.

First record of Epigonus constanciae [Giglioli, 1880], [deepwater cardinalfish] [Osteichthyes: Epigonidae], from Aegean Sea, Turkey

100%

Ozaydin O. , Leblebici S. , Uluturk E. , Filiz H.

Acta Ichthyologica et Piscatoria

2007

tom 37

nr 2

91-94

Five specimens of Epigonus constanciae (Giglioli, 1880) (deepwater cardinalfish) were captured first time during a bottom trawl survey in Sigacik Bay and off Karaburun, Aegean Sea. This is the first record of the species from the Aegean Sea. A short description certain of morphometric and meristic features of specimens are given.

First record of Facciolas sorcerer, Facciolella oxyrhyncha (Actinopterygii, Anguilliformes, Nettastomatidae) from the Aegean Sea

100%

Leblebici S. , Ozaydin O. , Eronat E. G. T.

tom 40

nr 1

A specimen of Facciola’s sorcerer, Facciolella oxyrhyncha (Bellotti, 1883), was caught for the first time in the central Aegean Sea, on January 2007 by a commercial bottom trawler at a depth of about 230 m on the muddy bottom of Southern Sigacik Bay, Aegean Sea, Turkey.

Design and comparative strength analysis of wheel rims of a lightweight electric vehicle using Al6063 T6 and Al5083 aluminium alloys

88%

Korkut T. B. , Armakan E. , Ozaydin O. , Ozdemir K. , Goren A.

2020

tom Vol. 99, nr 2

57--63

Purpose: Use of aluminium alloys in critical parts of a vehicle is common since they can combine the two important properties of a material those are being strength and lightweight. The aim in this research is to guide to design process of a wheel with taking example of an electric race vehicle implementation. Design/methodology/approach: In this study, the fatigue strengths of wheels produced for a two-person racing electric vehicle (Demobil09) are evaluated by calculating maximum distortion energy criterion (Von Mises) with Finite Element Analysis. Findings: Aluminium alloy wheels are crucial safety related components and are subjected to static and dynamic loads directly. Using FEA results, the weight and equivalent stress of the wheel are both reduced. So, the energy consumption is also decreased. Modal frequencies of the wheel models are determined. Research limitations/implications: In this paper, the materials analysed are AL6063 T6 and Al5083 aluminium alloys. Different materials can be analysed in future works. Practical implications: This paper is focusing on how to reduce the energy consumption of a two-person electric vehicle concentrating on reducing the weight of vehicle wheels. The vehicle is more technological than mass production cars since it is an electric race car which uses a hub motor, the body and chassis are produced using carbon polymer composites and all electronic units are designed and produced. Although its specialities it has homologated safety equipment like seats and safety belts. Originality/value: All boundary conditions must be analysed in details and a strength analysis must be conducted during design of the wheels for different load cases to ensure the strength of a wheel while keeping the weight as low as possible. In this complex process, this paper can give some clues to designers for strengths and weights of the designs since three different wheel forms are evaluated for reducing energy consumption of the vehicle.