Wyniki wyszukiwania - Biblioteka Nauki

1

Relationships Between Yarn Diameter / Diameter Variation and Strength

100%

Kılıç M. , Okur A.

Fibres & Textiles in Eastern Europe

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2006

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tom Vol. 14, no. 5 (59)

84--87

EN

In this study, relationships between yarn diameter/diameter variation and yarn strength were investigated. For this, we used 100% cotton combed ring yarns of nine types from the same blend which have three yarn counts with three levels of twists, as well as 100% wool worsted yarns of nine types which have nine different yarn counts and twist levels. The findings obtained were evaluated by correlation and regression analyses, and statistically significant correlation coefficients between yarn strength and yarn diameter/diameter variation were found. Furthermore, multiple linear regression models were established to allow the estimation of yarn strength from the other yarn parameters such as yarn diameter, diameter variation, twist, twist variation, capacitive and optical unevenness.

PL

Zbadano zależności pomiędzy średnicą przędzy i jej wahaniami a wytrzymałością. Do badań wzięto następujące rodzaje przędzy: bawełnianą (100%) czesankową przędzę obrączkową, pochodzącą z tej samej partii, ale w 9 wariantach, zróżnicowanych masą liniową (3 warianty); oraz wełnianą (100%) przędzę czesaną o 9 różnych masach liniowych i skrętach. Wyniki badań poddano ocenie za pomocą korelacji i analizy regresyjnej. Znaleziono statystycznie istotne współczynniki korelacji pomiędzy wytrzymałością przędzy a jej średnicą i wahaniami tej średnicy. Uzyskano również szereg liniowych modeli regresji wielokrotnej, które pozwalały na ocenę zależności wytrzymałości przędzy od jej parametrów takich jak: średnica, wahania średnicy, skręt, wahania skrętu i równomierność mierzona metodą optyczną i pojemnościową.

2

Normative size evaluation of internal auditory canal with magnetic resonance imaging: review of 3786 patients

70%

Fatih Erkoc M. , Imamoglu H. , Okur A. , Gumus C. , Dogan M.

Folia Morphologica

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2012

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tom 71

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nr 4

EN

Background: A narrow internal auditory canal (IAC) is significantly associated with congenital sensorineural hearing loss. It would therefore seem likely that any patient with an IAC measured radiographically to be under the normal range represents an abnormality and probable IAC stenosis. If narrow IAC is diagnosed with routine magnetic resonance imaging (MRI), then the cochlear nerve may be evaluated with special MRI studies. However, there is no consensus in the literature on the normal measurements of the IAC or on what parameters should be used to determine narrow IAC using MRI. In this study, we aimed to assess the normative size of IAC in normal-hearing ears and to determine whether canal size varies with age and gender using MRI. Material and methods: A retrospective review was undertaken from 2010 to 2012. A total of 7572 normal-hearing ears of 3786 patients were assessed, who had MRI due to various reasons except hearing loss. Patients under 20 years old and over 60 years old were excluded, and the subjects were divided into 4 groups at 10-year intervals. All subjects were divided by gender also. Anteroposterior (AP) and craniocaudal (CC) measurements were obtained in the middle of the IAC on axial and coronal images of 1.5-T MRI. Results: The mean age was 42 years (range 20–60 years). The mean IAC diameters were 5.93 mm with a standard deviation of 0.25 mm (max 6.99 mm, min 4.73 mm) on AP measurements and were 5.70 mm with a standard deviation of 0.26 mm (max 6.82 mm, min 4.71 mm) on CC measurements. There were no differences in the IAC diameters between males and females or with age groups. Conclusions: These measurements should provide a normative reference for comparison in radiographic assessment of any patient with suspected IAC stenosis. This measurement can help the diagnosis of narrow IAC. To our knowledge, this is the first study using MRI with a large group of patients in the literature. (Folia Morphol 2012; 71, 4: 217–220)

3

A novel index in healthy infants and children - subarachnoid space: ventricle ratio

61%

Okur A. , Kucuk O. , Karacavus S. , Yildirim A. , Erkoc M. F. , Erdogan Y. , Serin H. I.

Folia Morphologica

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2013

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tom 72

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nr 2

EN

Background: The subarachnoid space (SAS) and ventricular width (VW) in normal infants and children were studied with ultrasonography to provide the objective measurement and define a normal range for these measurements. The additional aim was to determine the stable ratio as a SAS/VW. Materials and methods: A total of 100 healthy subjects, including 48 males and 52 females, were studied. The cases were divided into 3 age groups: 0–6 months (n = 65), 7–12 months (n = 24) and > 13 months (n = 11). Transfontanel ultrasonography was performed in all the cases. SAS, VW and the SAS/VW ratios were calculated. The study was approved by the ethical committee. All parents were informed about the sonographic examination and their approvals were taken. Results: SAS was calculated as 3.1 (0.5–6) mm and VW was calculated as 3.6 (1.3–5) mm. SAS/VW ratio was 0.9 ± 0.3. There was no statistically significant difference among SAS, VW and SAS/VW ratios in 3–97 percentile group (p > 0.05). Conclusions: Ultrasonography can be used as a practicable and reproducible modality in the measurement of SAS and VW in healthy children. It is a non-invasive method and allows for serial follow-up. SAS/VW ratio can be used as an index in healthy children. (Folia Morphol 2013; 72, 2: 142–146)