Dispersive estimates for massive Dirac operators in dimension two

We study the massive two dimensional Dirac operator with an electric potential. In particular, we show that the $t^{-1}$ decay rate holds in the $L^1\to L^\infty$ setting if the threshold energies are regular. We also show these bounds hold in the presence of s-wave resonances at the threshold. We further show that, if the threshold energies are regular that a faster decay rate of $t^{-1}(\log t)^{-2}$ is attained for large $t$, at the cost of logarithmic spatial weights. The free Dirac equation does not satisfy this bound due to the s-wave resonances at the threshold energies.Comment: 40 page

Aile işletmelerinde pazar odaklılık ve firma performansi ilişkisi: Örgütsel yeteneklerin aracı rolü

This paper aimed to understand how market orientation affects family business performance that can build organizational capabilities in changing and emerging market. This research is based on a survey of 840 participants from family businesses in Turkey. The findings revealed that market orientation positively contributed to organizational capabilities. Another purpose of the study is the mediating effects of organizational capabilities on the association between market orientation and firm performance. So, findings showed that entrepreneurial capability is significantly mediated. As a result, all hypotheses revealed in the research are supported.Bu araştırma değişen ve gelişen pazar koşullarında pazar odaklılığın aile işletmelerinin örgütsel yetenekler geliştirebilmesini ve firmanın performansını nasıl etkilediğini anlamayı amaçlamıştır. Çalışma anket yöntemiyle Türkiye’ de aile işletmelerinde çalışan 840 kişi ile yapılmıştır. Sonuçlar pazar odaklılığın örgütsel yeteneklerin gelişimine pozitif katkı sağladığını ortaya koymaktadır. Çalışmanın diğer bir amacı örgütsel yeteneklerin pazar odaklılık ve firma performansı ilişkisi üzerinde aracı etkisini araştırmaktır. Girişimcilik yeteneğinin etkin bir şekilde aracı değişken olduğu görülmektedir. Sonuç olarak araştırmada ortaya konulan bütün hipotezler desteklenmiştir

Relationship between Market Orientation and Firm Performance: The Mediating Role of Organizational Capabilities in Family Business

This paper aimed to understand how market orientation affectsfamily business performance that can build organizational capabilities in changingand emerging market. This research is based on a survey of 840 participants fromfamily businesses in Turkey. The findings revealed that market orientationpositively contributed to organizational capabilities. Another purpose of the study isthe mediating effects of organizational capabilities on the association betweenmarket orientation and firm performance. So, findings showed that entrepreneurialcapability is significantly mediated. As a result, all hypotheses revealed in theresearch are supported

Relationship between Market Orientation and Firm Performance: The Mediating Role of Organizational Capabilities in Family Business

This paper aimed to understand how market orientation affectsfamily business performance that can build organizational capabilities in changingand emerging market. This research is based on a survey of 840 participants fromfamily businesses in Turkey. The findings revealed that market orientationpositively contributed to organizational capabilities. Another purpose of the study isthe mediating effects of organizational capabilities on the association betweenmarket orientation and firm performance. So, findings showed that entrepreneurialcapability is significantly mediated. As a result, all hypotheses revealed in theresearch are supported

Zaman ve mekân kavramları arasındaki paradoksal i̇lişkinin “Bulut Atlası” filmi üzerinden okunması

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Mimar Vedat Tek

Mimar Vedat Tek, Osmanlı İmparatorluğunun son dönemlerinde mimarlık mesleğini icra eden ve hepimizin aşina olduğu önemli eserler veren bir ustadır. Aldığı Batılı eğitimle, Osmanlı Klasik mimarlığını birleştiren eserler veren Vedat Tek, “Birinci Ulusal Mimari Akımı” olarak adlandırılan dönemin öncülerinden biri kabul edilmiştir. Çalışmamızda, genel hatlarıyla Vedat Tek’in yaşamı, mimari kişiliği, I. Ulusal Mimarlık Akımı ve önemli eserlerinden bazılarına kısaca yer verilmiştir.Architect Vedat Tek is an expert that we are all familiar with, who was performing his profession as an architect in the late Ottoman period. Vedat, who combined his Western education with the education on Ottoman Classical Architecture, is accepted as one of the pioneers of the period entitled “First National Architectural Trend”. In this paper, the life of Vedat Tek is illustrated in a general sense and First National Architectural Trend and some important architectural works are briefly explained

The Influence of Storytelling Approach in Travel Writings on Readers’ Empathy and Travel Intentions

AbstractAs a fascinating concept, storytelling attracts many researchers from a variety of disciplines. Of particular interest is the power of storytelling both on a corporate and on a product level. However, its components and implications on the people and their behavioral intentions (i.e., word and mouth, visit intention) within travel marketing are limited. In this study, we empirically investigated the relationship between the components of storytelling, empathy and behavioral intentions. By studying 155 readers, we found that perceived esthetics, narrative structure, self-reference will evoke reader empathy. We also showed that empathy was found to generate positive emotional response and behavioral intentions toward travel destination. In this sense, we suggested that travel narratives need to consider esthetics, narrative structure and relevance to readers and empathy can be considered as a determinant of emotion in the research of marketing

Decreased ocular pulse amplitude and retinal nerve fibre layer in multiple sclerosis

This study was conducted to assess ocular pulse amplitude and retinal nerve fibre layer in patients with multiple sclerosis and their correlation with disease duration and with severity. Retinal nerve fibre layer thickness was measured by Heidelberg Retinal Tomography II (HRT-II; Heidelberg Engineering, Dossenheim, Germany) and ocular pulse amplitude was measured by dynamic contour tonometry (Ziemer Ophthalmic Systems, Port, Switzerland) in 37 multiple sclerosis patients and 72 age- and gender-matched controls. Ocular pulse amplitude was significantly reduced and retinal nerve fibre layer was significantly thinner in temporal, superotemporal, and nasal sectors in patients with multiple sclerosis regardless of having an optic neuritis attack. The retinal nerve fibre layer was thinner in eyes with a previous optic neuritis attack compared with the eyes without an attack, but the difference was not significant. Ocular pulse amplitude showed a positive correlation with visual evoked potential amplitude and a negative correlation with visual evoked potential latency. Retinal nerve fibre layer thickness showed a significant negative correlation with the disease duration but not with visually evoked potential, disease severity, nor previous optic neuritis. These findings indicate that the process of degeneration starts in the early period of the disease, as our study group is composed of early-middle-stage multiple sclerosis patients, and is independent of relapses. © Informa Healthcare USA, Inc

KRAS Mutation in Small Cell Lung Carcinoma and Extrapulmonary Small Cell Cancer

Background: Lung cancer is one of the most lethal cancers. It is mainly classified into 2 groups: non-small cell lung can-cer (NSCLC) and small cell lung cancer (SCLC). Extrapul-monary small cell carcinomas (EPSCC) are very rare. The Ras oncogene controls most of the cellular functions in the cell. Overall, 21.6% of human cancers contain a Kirsten Ras (KRAS) mutation. SCLC and EPSCC have several similar features but their clinical course is different.Aims: We investigated the KRAS mutation status in SCLC and EPSCC.Study design: Mutation research.Methods: Thirty-seven SCLC and 15 EPSCC patients were included in the study. The pathological diagnoses were confirmed by a second pathologist. KRAS analysis was performed in our medical genetic department. DNA isola-tion was performed with primary tumor tissue using the QIAamp DNA FFPE Tissue kit (Qiagen; Hilden, Germany) in all patients. The therascreen KRAS Pyro Kit 24 V1 (Qia-gen; Hilden, Germany) was used for KRAS analyses. Results: Thirty-four (91.9%) of the SCLC patients were male, while 11 (73.3%) of the EPSCC l patients were fe-male. SCLC was more common in males, and EPSCC in females (p=0.001). A KRAS mutation was found in 6 (16.2%) if SCLC patients. The most common mutation was Q61R (CAA>CGA). Among the 15 EPSCC patients, 2 had a KRAS mutation (13.3%). When KRAS mutant and wild type patients were compared in the SCLC group, no differ-ence was found for overall survival (p=0.6).Conclusion: In previous studies, the incidence of KRAS mutation in SCLC was 1-3%; however, it was 16.2% in our study. Therefore, there may be ethnic and geographical differences in the KRAS mutations of SCLC. As a result, KRAS mutation should not be excluded in SCL

25-Hydroxy vitamin d levels and endothelial vasodilator function in normotensive women

Introduction: Vitamin D was shown to be related to endothelial function and bloodpressure. Reactive hyperaemia index (RHI) measurement by pulse arterial tonometryis a new method to evaluate vasodilator function of endothelium. We aimedto evaluate the relationship between vitamin D levels and RHI in women.Material and methods: We enrolled 56 normotensive, nonsmoker, normolipidemicand normoglycemic women, (23 with 25-OH-vita min D levels > 20 µg/l,and 33 with values lower than 20 µg/l). The cardiologist who was blind for vitaminD results executed measurements by pulse arterial tonometry. The measurementwas performed on the lying patient with pre- and post-occlusion measurementsof RHI by digital sensors placed on each index finger, by 5 minintervals. Pulse amplitudes were recorded, pre-occlusion and post-occlusionratio was compared by the software of device. Stepwise linear regression andmultiple regression analyses were performed to evaluate predictors of endothelialfunction.Results: The low vitamin D group had a lower RHI value than the normal vitaminD group (p = 0.042). In regression analysis, positive predictors of RHI wereserum 25-OHD (ß = 0.401; 95% CI 0.010-0.042, p = 0.002), serum albumin(ß = 0.315; 95% CI 0.286-2.350, p = 0.013), and, inversely, serum calcium(ß = –0.247; 95% CI (–1.347)-(–0.010), p = 0.047).Conclusions: Serum 25-hydroxy vitamin D was significantly related to endothelialfunctions measured as RHI, even in healthy non-smoker women