ROTSE observations of the young cluster IC 348

CCD observations of stars in the young cluster IC 348 were obtained from 2004 August to 2005 January with a 0.45 m ROTSEIIId robotic reflecting telescope at the Turkish National Observatory site, Bakirlitepe, Turkey. The timing analysis of selected stars whose X-Ray counterpart were detected by Chandra X-Ray Observatory were studied. The time series of stars were searched for rotational periodicity by using different period search methods. 35 stars were found to be periodic with periods ranging from 0.74 to 32.3 days. Eighteen of the 35 periodic stars were new detections. Four of the new detections were CTTSs and the others were WTTSs and G type (or unknown spectral class) stars. In this study, we confirmed the stability of rotation periods of TTauri stars. The periods obtained by Cohen et al. and us were different by 1%. We also confirmed the 3.24 h pulsation period of H254 which is a delta Scuti type star as noted by Ripepi et al. but the other periods detected by them were not found. We examined correlation between X-ray luminosity and rotational period of our sample of TTSs. There is a decline in the rotational period with X-ray luminosity for late type TTSs.Comment: 15 pages, 14 figures, accepted for publication in Astronomical Journa

Emission-Line Fluxes of Northern Planetary Nebulae

We present long slit spectrophotometric emission line fluxes of bright and extended (<5 arcsec in diameter) Planetary Nebulae (PNe) selected from Acker et al. 1992 catalog with suitable equitorial coordinates for Northern hemisphere. In total, 17 PNe have been choosen and observed in 2008--2010. To measure absolute fluxes, broad slit sizes, ranging from 3.5\arcsec to 7.5\arcsec were used and thus equivalent widths of all observable emission line fluxes were also calculated. Among 17 PNe's observed, line flux measurements of 12 of them were made for the first time. This work also aims to extend the sky coverage of emission line flux standards in Northern hemisphere (Dopita & Hua 1997 - 52 PNe in Southern hemisphere; Wright et al. 2005 - 6 PNe in Northern hemisphere). Electron temperatures and densities, and chemical abundances of these PNe were also calculated in this work. These data is expected to lead the photometric or spectrometric further work for absolute emission line flux measurements needed for \hii regions, supernova remnants etc.Comment: 24 pages, 3 Figures, 21 Tables, Accepted for publication in Publications of the Astronomical Society of Australi

Denison örgüt kültürü modeli üzerine bir araştırma

Günümüzde kitle iletişim araçlarının gelişmesi, teknolojinin ilerlemesi, ulusal ve uluslararası alanda rekabetin hızlı bir şekilde artması örgütlerin politikalarını ve uygulamalarını etkilemektedir. Tüm bu unsurlar örgütlerin yaşam alanlarında bazı olgulara merkezi bir değer yüklemiştir. Bu olguların başında ekolojik dengesini temsil eden ve yaşam alanı olarak görülen örgüt kültürü kavramı gelmektedir. Örgüt kültürü, örgütün kendini ve dış dünyayı algılayış biçimini belirlemektedir. Bu algılayış biçimi de örgütün eylemlerine yön vermek suretiyle onu geleceğe taşımaktadır. Örgütler açısından bu derece önemli olan kültür olgusunun çalışanlar tarafından anlaşılabilir, yöneticiler tarafından da uygulanabilir olması gerekir. Bu yönüyle anlaşılması ve uygulanması örgütler için ciddi bir gelişme sağlayacak bir model olarak literatürde değerlendirilen Denison Örgüt Kültürü Modeli çalışmanın araştırma konusunu oluşturmaktadır. Çalışma kapsamında Denison Örgüt Kültürü Modelini incelemek üzere Ege bölgesinin ilk 500 ve ikinci 500’e giren firmaları incelenmiş ve bakır sektöründen 2 firma, tekstil sektöründen 2 firma ve gıda sektöründen 2 firma olacak şekilde toplamda 6 firma üzerinde uygulama gerçekleştirilmiştir. Bu kapsamda elde edilen verilerle ilgili tanımlayıcı istatistikler ve sektörler arası farklılık testleri yapılarak Denison Örgüt Kültürü Modeline ilişkin analizler gerçekleştirilmiştir

Analyzing Main and Interaction Effects of Length of Stay Determinants in Emergency Departments

Background: Measuring and understanding main determinants of length of stay (LOS) in emergency departments (EDs) is critical from an operations perspective, since LOS is one of the main performance indicators of ED operations. Therefore, this study analyzes both the main and interaction effects of four widely-used independent determinants of ED-LOS.Methods: The analysis was conducted using secondary data from an ED of a large urban hospital in Izmir, Turkey. Between-subject factorial analysis of variance (ANOVA) was used to test the main and interaction effects of the corresponding factors. P values <.05 were considered statistically significant.Results: While the main effect of gender was insignificant, age, mode of arrival, and clinical acuity had significant effects, whereby ED-LOS was significantly higher for the elderly, those arriving by ambulance, and clinically-categorized high-acuity patients. Additionally, there was an interaction between the age and clinical acuity in that, while ED-LOS increased with age for high acuity patients, the opposite trend occurred for low acuity patients. When ED-LOS was modeled using gender, age, and mode of arrival, there was a significant interaction between age and mode of arrival. However, this interaction was not significant when the model included age, mode of arrival, and clinical acuity. Conclusion: Significant interactions exist between commonly used ED-LOS determinants. Therefore, interaction effects should be considered in analyzing and modelling ED-LOS

Optical variabilities in Be/X-ray binary system:GRO J2058+42

We present an analysis of long-term optical monitoring observations and optical spectroscopic observations of the counterpart to CXOU J205847.5+414637 (high mass X-ray binary system). We search for a variability in the light curve of Be star. We used differential magnitudes in the time series analysis. The variability search in the optical light curve was made by using different algorithms. The reduction and analysis of spectra were done by using MIDAS and its suitable packages. We have performed a frequency search which gave us the value 2.404 1/day. This value is attributed to the non-radial pulsation of Be star. H alpha emission line profiles always show double-peaked emissions with a mean equivalent width of 2.31 \pm 0.19 \AA ~and a peak separation of 516 \pm 45 km/s. This suggests that Be star disk is still present. CXOU J205847.5+414637 is in X-ray quiescent state.Comment: 8 pages, 9 figures. To appear at Astronomy and Astrophysic

Erzincan Altınada Sulama Şebekesinin Performansının Değerlendirilmesi

Bu çalışma; Erzincan Altınada Sulama Birliği şebekesinin 2014-2018 yıllarındaki performansının izlenip değerlendirilmesi amacıyla yürütülmüştür. Çalışmada daha önceki çalışmalarda kullanılan ve önerilen performans ölçüm parametreleri kullanılmıştır. Bu parametreler; şebekedeki sulama alanı oranları ile bu alanlar için gerekli net ve toplam su sağlanma oranları, üretim değeri oranı ile bunun mali getirisi, şebekenin mali yeterlilik ve mali etkinlik oranları, su ücretlerinin tahsilat oranı, sürdürülebilir sulama alanı oranı ile karlılık oranlarıdır. Sulu tarıma açılmış toplam alan 3600 hektar iken araştırma yıllarında 2254,93 ha ile 2751,56 ha arasında değişen alanlarda bitkisel üretim yapıldığı belirlenmiştir. Araştırma yıllarında sürdürülebilir sulama alanı oranları %130,83ile %159,65 arasında iken sulama alanı oranları değerleri %62,64 ile %76,43 arasında kalmıştır. Şebekede aylık net su temin oranlarının 0,78 ile 3,44 arasında iken toplam su temin oranlarının 1,53 ile 6,70 arasında değiştiği, yani çiftçinin aşırı su kullanma eğiliminin olduğu belirlenmiştir. Altınada sulama birliği sahasında üretim değeri oranı %33,05 ile %44,79; karlılık oranı ise 0,95 ile 2,59 arasındadır. Mali etkinlik oranı %22,70 ile %53,30 mali yeterlilik oranı %45,24 ile %101,64, yıllık tahsilât oranı %13,0 ile %96,0, toplam tahsilat oranı da %89 ile %169 arasında gerçekleşmiştir. Ekonomik parametreler bakımından planlama beklentilerine yaklaşılamadığı belirlenmiştir. Şebekede gerçekleşen üretimin planlama öngörülerine yaklaşabilmesi için sulama alanı oranının artırılması, mali getirileri yüksek olan üretim deseninin seçilmesi ve mali kaynakların daha etkin kullanılması gerektiği sonucuna ulaşılmıştır

Recent RXTE/ASM and ROTSEIIId Observations of EXO 2030+375

Using the archival RXTE/ASM and SWIFT/BAT observations, the new orbital phases of Type I outbursts of EXO 2030+375 are estimated. A possible correlation between the Type II outburst and optical brightness variations is investigated. In order to estimate the phases of Type I outbursts, we fitted Gaussian profiles to the RXTE/ASM and SWIFT/BAT light curves. The time corresponding to the maximum value of the profiles is treated as the arrival time of Type I outburst. We used differential magnitudes in the time-series analysis of the optical light curve. MIDAS and its suitable packages were used to reduce and analyze the spectra. Prior to the Type II outburst, orbital phases of Type I outbursts were delayed for 6 days after the periastron passage, which is consistent with findings of Wilson et al., (2002, 2005). After the giant Type II outburst, the phase of Type I outbursts underwent a sudden shift of 13 days after the periastron passage. The amplitudes of Type I outbursts were increased between MJD 52500 and 53500. These amplitudes then decreased for 10 orbital cycles until the Type II outburst was triggered. If the change of outburst amplitudes correlated with the mass accretion, then during the decrease of these amplitudes mass should be deposited in a disk around neutron star temporarily. The release of this stored mass may ignite the Type II outburst. We report that the optical light curve became fainter by 0.4 mag during the decrease of amplitude of the Type I outbursts. The observed H$\alpha$ profiles and their equivalent widths during the decay and after the giant outburst are consistent with previous observations of the system.Comment: to appear at Astronomy and Astrophysic

Work addiction and its relation with dark personality traits: a cross-sectional study with private sector employees

Personality traits have been extensively studied to understand different behavioral addictions. However, less is known about the relationship of employees’ dark personality traits and work addiction. The purpose of the present study was to examine the associations between the Big Five personality traits (i.e., extroversion, neuroticism, agreeableness, openness, conscientiousness) and dark personality traits (i.e., narcissism, Machiavellianism, psychopathy, sadism, and spitefulness) with work addiction. A total of 514 private sector employees completed a survey that included psychometric assessment tools for the aforementioned variables. Hierarchical regression analysis indicated that lower extroversion, lower openness to experience, higher narcissism, and higher spitefulness were positively associated with work addiction among private sector employees. The findings of the present study suggest that dark personality traits should also be taken into account in order to better understand work addiction among employees