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RISS 인기검색어
- 검색키워드
- 저자 : Stabler, Christina (검색결과 5 건)
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High-temperature creep behavior of a SiOC glass ceramic free of segregated carbon
Stabler, Christina,Roth, Felix,Narisawa, Masaki,Schliephake, Daniel,Heilmaier, Martin,Lauterbach, Stefan,Kleebe, Hans-Joachim,Riedel, Ralf,Ionescu, Emanuel Elsevier 2016 Journal of the European Ceramic Society Vol.36 No.15
<P><B>Abstract</B></P> <P>In this study we present the high-temperature creep behavior of a dense SiOC glass ceramic free of segregated carbon. Solid-state NMR spectroscopy, XRD and TEM investigations indicate that the sample consists of β-SiC nanoparticles homogeneously dispersed in an amorphous silica matrix. Compression creep experiments were performed at 1100–1300°C and stresses of 50–100MPa. The calculated creep viscosity of SiOC is two orders of magnitude higher than that of pure silica. Whereas the activation energy for creep (696kJ/mol) is close to that determined in pure silica glass. However, a stress exponent of 1.7 was calculated, suggesting that other mechanisms might contribute to the creep in addition to the Newtonian viscous flow. The strong difference in the creep rates and creep mechanism of the SiOC glass ceramic and amorphous silica is discussed in terms of possible contributions of the interface between the silica matrix and the β-SiC nanoparticles.</P>
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Lumbar burner and stinger syndrome in an elderly athlete
( Veronika Wegener ),( Axel Stabler ),( Volkmar Jansson ),( Christof Birkenmaier ),( Bernd Wegener ) 대한통증학회 2018 The Korean Journal of Pain Vol.31 No.1
Burner or stinger syndrome is a rare sports injury caused by direct or indirect trauma during high-speed or contact sports mainly in young athletes. It affects peripheral nerves, plexus trunks or spinal nerve roots, causing paralysis, paresthesia and pain. We report the case of a 57-year-old male athlete suffering from burner syndrome related to a lumbar nerve root. He presented with prolonged pain and partial paralysis of the right leg after a skewed landing during the long jump. He was initially misdiagnosed since the first magnet resonance imaging was normal whereas electromyography showed denervation. The insurance company refused to pay damage claims. Partial recovery was achieved by pain medication and physiotherapy. Burner syndrome is an injury of physically active individuals of any age and may appear in the cervical and lumbar area. MRI may be normal due to the lack of complete nerve transection, but electromyography typically shows pathologic results. (Korean J Pain 2018; 31: 54-7)
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( Jane Worlitz(m. Sc) ),( Stefan Peplowsky ),( Anne Stabler ),( Ing Ralf Woll(prof. Dr. ) ) 한국품질경영학회 2015 한국품질경영학회 학술대회 Vol.2015 No.2
Because of the increasing importance of computer skills for the professional life it is important to train the practical appliance of quality tools by using software during the study. The different levels of knowledge of the students concerning their software skills bear the challenge of regarding these distinctions. The aim of this research is to verify the applicability of video tutorials for the improvement of software skills. Video tutorials will be tested as teaching material of self-regulated learning. Approach The analysis was carried out in four steps. The first step determined the level of computer skills of German adolescents and the impact those skills have on the universal apprenticeship. The self-regulated learning as a concept to even out missing knowledge is being explained in the second step. Furthermore examples such as action learning are being presented. The attention however is focused on the concept of e-learning and especially on video tutorials because it is a concept of self-regulated learning that was tested in this research. The third step of the research implies the development of the video tutorial prototype that was used in this study. The first part of that section describes criteria of how to design a video tutorial. Those criteria were identified from literature research. In the second part of the section prototypes were developed. The created video tutorials were tested in the fourth step of the research. 65 students were parted in two groups and asked to work on an assignment concerning the use of quality tools in Microsoft Excel. One group used video tutorials and the other group was guided by a teacher. Before and after the assignment the students were asked to fill out a survey. The first survey contained questions of how the students estimate their Microsoft Excel skills. In the second survey the students were asked to evaluate the aid they had to help fulfilling the assignment. Furthermore the time to solve the task and the results were recorded.
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Associations between Body Composition, Hormonal and Lifestyle Factors, Bone Turnover, and BMD
Margaret Gourlay,Catherine A. Hammett-Stabler,Jordan B. Renner,Janet E. Rubin 대한골대사학회 2014 대한골대사학회지 Vol.21 No.1
Background: The relative importance of body composition, lifestyle factors, bone turn-over and hormonal factors in determining bone mineral density (BMD) is unknown. Westudied younger postmenopausal women to determine whether modifiable or non-modifiable risk factors for osteoporosis have stronger associations with BMD. Methods: In multivariable linear regression models, we tested associations betweennon-bone body composition measures, self-reported measures of physical activity anddietary intake, urinary N-telopeptide (NTx), sex hormone concentrations, and BMD in109 postmenopausal women aged 50 to 64 years, adjusting for current hormone thera-py use and clinical risk factors for low BMD. Lean mass, fat mass and areal BMD (aBMD)at the lumbar spine, femoral neck, total hip and distal radius were measured using dualenergy X-ray absorptiometry. Results: Higher body weight and self-reported nonwhite race were independently asso-ciated with higher aBMD at the lumbar spine, femoral neck, total hip and distal radius. Lean and fat mass were not independently associated with aBMD. Older age and higherurinary NTx were independently associated with lower aBMD at the distal radius but notat weight-bearing sites. Sensitivity analyses demonstrated lack of an independent asso-ciation between total daily protein or calorie intake and BMD. Conclusions: BMD, weight and race were the most important determinants of aBMD atall sites. Older age and higher bone turnover were independently associated with loweraBMD at the distal radius. In a limited analysis, self-reported physical activity, dietaryprotein and calorie intake were not associated with aBMD after adjustment for the othervariables.
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