Phonon Softening and Direct to Indirect Bandgap Crossover in Strained Single Layer MoSe2

Motivated by recent experimental observations of Tongay et al. [Tongay et al., Nano Letters, 12(11), 5576 (2012)] we show how the electronic properties and Raman characteristics of single layer MoSe2 are affected by elastic biaxial strain. We found that with increasing strain: (1) the E' and E" Raman peaks (E1g and E2g in bulk) exhibit significant red shifts (up to 30 cm-1), (2) the position of the A1' peak remains at 180 cm-1 (A1g in bulk) and does not change considerably with further strain, (3) the dispersion of low energy flexural phonons crosses over from quadratic to linear and (4) the electronic band structure undergoes a direct to indirect bandgap crossover under 3% biaxial tensile strain. Thus the application of strain appears to be a promising approach for a rapid and reversible tuning of the electronic, vibrational and optical properties of single layer MoSe2 and similar MX2 dichalcogenides.Comment: http://link.aps.org/doi/10.1103/PhysRevB.87.12541

THE EFFECTS OF MATHEMATICAL DISCUSSION ENVIRONMENT SUPPORTED BY METACOGNITIVE PROBLEMS ON THE PROBLEM POSING SKILLS OF 3TH GRADE PRIMARY SCHOOL GRADE STUDENTS

The aim of this research is to examine the effects of mathematical discussion envıronment supported by metacognitive problems on the problem posing skills of grade 3th primary school grade students. The study was carried out based on pre-test and post-test, control group model. Two experiment and one control group were formed from the students who participated in the research. The sample group consists of 52 students who are studying at the third grade level. According to the findings obtained from the research, it is seen that the discussion method supported by metacognitive questions applied in experiment-1 group, is especially effective in the dimensions of problem posing as “Realization of the Components of the Problem (RCP)”, “Identification of the relationship between concept and operation (IRCC)”, “Establishment of the problem requiring desired operation (EPRDO)” and “Posing problems based on the given visual and numerical data (PPGVN)”.   Article visualizations

THE RELATIONSHIP BETWEEN TRUST, TURNOVER INTENTIONS AND EMOTIONS: AN APPLICATION

Managerial leaders and directors are required to succeed the method of “sense” and “emotion” very well, to achieve organizational aims (Lee, 2002). Organizations need to manage all the emotions and feelings and concepts that affect persons health and performance (Gross, 1999). Business life dealing with this issue has increased in seriousness because, the effect of emotions in decision making cleared with academic studies. There is a need to find the path to the correct leadership of emotions. Emotions in the organization help to identify thoughts about the presence and desire to work (Jackson, 2006). The main purpose of this study, which should be considered a descriptive survey in the general sense, is to investigate the relationship between emotional expressions, trust and turnover intentions. Two different surveys were used in order to measure and assess the emotions expressions, trust and turnover intentions. The survey conducted on 200 employees of the public sector institution. Data, obtained from questionnaires analyzed through the SPSS statistical packaged software. We found that especially trust factors (Trust in management, co-worker trust and trust to manager) had a significant effect on “satisfaction” factor of turnover intentions. In addition, we found that “Co-worker trust” had a negative and significant effect on “Seek for job” factor of turnover intentions

Radiology findings and non-invasive ventilation response

There is a considerable variation in NIV among hospitals, regions and countries although it is a simple and useful method. Thepatient should be monitored via subjective response (respiratory distress, consciousness, problems related to mask and airflow),physiological responses (respiration rate, respiratory effort, air leakage) and patient-ventilator compliance (gas exchange, pulseoximetry, arterial blood gases). Normalization in respiration rate within 1 or 2 hours after initiation of treatment is one of the mostimportant markers for recovery. The goal is to maintain respiration rate between 20 and 30 breaths/minute. Reduction in intercostaland supraclavicular retractions, paradoxical respiration and sympathetic activity indicate success of treatment. Arterial bloodgases are measured within first 2 hours in order to assess pH and CO2; and as needed thereafter. In general, NIV is assessed byarterial blood gases, hemodynamic parameters and several laboratory tests. There is limited number of studies in NIV. Here, weaimed to assess radiological implications of gas distribution within lung tissue during NIV therapy

Experimental application of sum rules for electron energy loss magnetic chiral dichroism

We present a derivation of the orbital and spin sum rules for magnetic circular dichroic spectra measured by electron energy loss spectroscopy in a transmission electron microscope. These sum rules are obtained from the differential cross section calculated for symmetric positions in the diffraction pattern. Orbital and spin magnetic moments are expressed explicitly in terms of experimental spectra and dynamical diffraction coefficients. We estimate the ratio of spin to orbital magnetic moments and discuss first experimental results for the Fe L_{2,3} edge.Comment: 11 pages, 2 figure

Autekologi dan Fisiologi Percambahan Centaurea kilaea Boiss. dari Turki

In this study germination requirements, plant-soil interactions and population biology of Centaurea kilaea was studied. The plant and soil samples were collected from Sofular Village (Sile District) and shore of Çatalca District (Istanbul) in Turkey by using standard methods. Methods like Scheibler, Wetdigestion, Kjeldahl and Olsen were employed for measurement of soil texture, structure and other physical and chemical characteristics (pH, total protein and electrical conductivity) using spectrophotometer, flame photometer, calcimeter and ICP. The results showed that ranges of different elements in the soil were 0.007-0.2% for N, 0.0007-0.001% for P, 0.001-0.01% for K, 0.0001-0.0002 % for Na. N, P, K and Na values in the plants were 2.17, 0.005, 0.1 and 0.006%, respectively. The data revealed that germination success of the seeds was influenced by the environmental factors such as pH, germination season and temperature.Dalam kajian ini keperluan percambahan, saling tindakan tumbuhan-tanih dan biologi populasi Centaurea kilaea telah dilakukan. Sampel tumbuhan dan tanih telah dikumpul dari Kampung Sofular (Daerah Şile) dan pantai Daerah Çatalca (Istanbul) di Turki dengan menggunakan kaedah piawai. Kaedah seperti Scheibler, Wetdigestion, Kjeldahl dan Olsen telah digunakan bagi pengukuran tekstur tanih, struktur dan sifat fizikal dan kimia lain (pH, jumlah protein dan kekonduksian elektrik) menggunakan spektrofotometer, fotometer api, kalsimeter dan ICP. Hasil menunjukkan bahawa julat unsur berbeza dalam tanih ialah 0.007-0.2% bagi N, 0.0007-0.001% bagi P, 0.001-0.01% bagi K, 0.0001-0.0002% bagi Na. N, P, K dan nilai Na dalam tumbuhan ialah masing-masing 2.17, 0.005, 0.1 dan 0.006%. Data menunjukkan kejayaan percambahan bagi biji benih telah dipengaruhi faktor persekitaran seperti pH, musim percambahan dan suhu

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

Background: The subarachnoid space (SAS) and ventricular width (VW) in normalinfants and children were studied with ultrasonography to provide the objectivemeasurement 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 and52 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 wereinformed 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 modalityin the measurement of SAS and VW in healthy children. It is a non-invasivemethod and allows for serial follow-up. SAS/VW ratio can be used as an index inhealthy children

Wyniki badań radiologicznych a odpowiedź na nieinwazyjną wentylację

Mimo że nieinwazyjna wentylacja (NIV) jest prostą oraz użyteczną metodą, obserwuje się znaczne zróżnicowanie w jej stosowaniu pomiędzy krajami, regionami czy nawet szpitalami. Pacjent powinien być oceniony zarówno w stosunku do odpowiedzi subiektywnej (niewydolność oddechowa, świadomość, problemy związane z maską oraz przepływem powietrza), fizjologicznej (częstość oddechów, wysiłek oddechowy, przeciek powietrza), jak i zgodności z respiratorem (wymiana gazowa, pulsoksymetria, gazometria krwi tętniczej). Normalizacja częstości oddechów w ciągu 1 lub 2 godzin po rozpoczęciu leczenia jest jednym z najważniejszych wykładników postępów leczenia. Celem jest utrzymanie częstości oddechów między 20 a 30 oddechami na minutę. Zmniejszenie skurczów międzyżebrowych i nadobojczykowych, oddychania paradoksalnego czy aktywności współczulnej wskazują na powodzenie terapii. Gazometrię krwi tętniczej oznacza się w ciągu pierwszych 2 godzin w celu oceny pH i CO2; a w razie potrzeby także później. Ogólnie rzecz ujmując, NIV ocenia się za pomocą gazometrii krwi tętniczej, parametrów hemodynamicznych i kilku testów laboratoryjnych. Liczba badań dotyczących NIV jest ograniczona. Autorzy niniejszej pracy postawili sobie za cel ocenę radiologicznych implikacji dystrybucji gazu w tkance płucnej w trakcie terapii NIV.Mimo że nieinwazyjna wentylacja (NIV) jest prostą oraz użyteczną metodą, obserwuje się znaczne zróżnicowanie w jej stosowaniu pomiędzy krajami, regionami czy nawet szpitalami. Pacjent powinien być oceniony zarówno w stosunku do odpowiedzi subiektywnej (niewydolność oddechowa, świadomość, problemy związane z maską oraz przepływem powietrza), fizjologicznej (częstość oddechów, wysiłek oddechowy, przeciek powietrza), jak i zgodności z respiratorem (wymiana gazowa, pulsoksymetria, gazometria krwi tętniczej). Normalizacja częstości oddechów w ciągu 1 lub 2 godzin po rozpoczęciu leczenia jest jednym z najważniejszych wykładników postępów leczenia. Celem jest utrzymanie częstości oddechów między 20 a 30 oddechami na minutę. Zmniejszenie skurczów międzyżebrowych i nadobojczykowych, oddychania paradoksalnego czy aktywności współczulnej wskazują na powodzenie terapii. Gazometrię krwi tętniczej oznacza się w ciągu pierwszych 2 godzin w celu oceny pH i CO2; a w razie potrzeby także później. Ogólnie rzecz ujmując, NIV ocenia się za pomocą gazometrii krwi tętniczej, parametrów hemodynamicznych i kilku testów laboratoryjnych. Liczba badań dotyczących NIV jest ograniczona. Autorzy niniejszej pracy postawili sobie za cel ocenę radiologicznych implikacji dystrybucji gazu w tkance płucnej w trakcie terapii NIV

Experimental study of solubility of elemental sulphur in methane

International audienceThe chemical engineering department of LaTEP has been working for many years on theproblem of sulphur deposition especially in natural gas network [1, 2]. The solid sulphurappears immediately downstream of a pressure reduction facility. One of the hypothesesproposed to explain the solid formation, based on a thermodynamic approach, is thedesublimation of sulphur. During gas expansion, both pressure and temperature decrease.Consequently the gas may become over saturated in sulphur. Because we are below thetemperature of sulphur triple point, part of the gaseous sulphur can be transformed into solidparticles. Thus, it is important to obtain solubility data of sulphur in natural gases. Methane isthe major natural gas component. So, it is of importance to measure solubility of elementalsulphur in CH4. In this paper experimental measurements up to a pressure and temperature of30 MPA and 363.15 K are presented.The principle of the experimental pilot can be resumed following three steps: saturationof the gas with sulphur, trap of all the dissolved gaseous sulphur and finally quantification.Although the principle is simple, experimental difficulties occur at the three steps. A variablevolume equilibrium cell is used to saturate the gas with sulphur. Since sulphur solubility valueis weak in gas transport conditions, the volume of the cell is necessarily big (0.5 Litre). Thepressure of the equilibrium cell is held constant thanks to a piston during the trapping step. Anoriginal gaseous sulphur trapping method was developed. It is based on the reactiveabsorption of the gaseous sulphur with solvent. Indeed, the gas bubbles into a liquid solutionwhich traps gaseous sulphur. Finally, the solution which contains a standard is analysed bygas chromatography and sulphur is quantified. The total volume of the gas withdrawn isdetermined by a position transducer placed on the autoclave. Then, the sulphur solubilityvalue is calculated

Metastatic Serous Carcinoma Initially Presented As An Incarcerated And Strangulated Umbilical Hernia: A Rare Case Report

Introduction: We report a rare case of a metastatic serous ovarian carcinoma presented as an incarcerated and strangulated umbilical hernia.Presentation of case: A 54 year-old female was admitted to the hospital with a painful mass around the umblical region. It was elucidated during clinical history that the mass had been present for 3 to 4 years without pain. An incarcerated and strangulated umbilical hernia including a solid mass and mesenteric fat was detected on physical examination. She underwent an urgent operation for strangulated umbilical hernia. The pathological diagnosis of the hernia material was reported as carcinoma compatible with serous ovarian carcinoma metastasis. Concurrently, total abdominal histerectomy and bilateral salphingo-oopherectomy, pelvic and paraaortic lymph node dissection, omentectomy and sigmoid colon resection were performed. Histopathological evaluation confirmed the serous carcinoma originated from the left ovary.Conclusion: In the literature, some metastatic tumors have been reported to be presented as umbilical metastasis rarely. However, the present case is the first metastatic ovarian cancer that initially presented as an incarcerated and strangulated umbilical hernia in the literature, to the best of our knowledge.