Synchrotron Based Infrared Microspectroscopy of Carbonaceous Chondrites.

Relationships between organic molecules and inorganic minerals are investigated in five carbonaceous chondrites, Northwest Africa 852 (CR2), Tagish Lake (C2-ungroupped), Orgueil (CI1), Sutter\u27s Mill (CM), and Murchison (CM2), with micron spatial resolution using synchrotron-based imaging micro-FTIR spectroscopy. Correlations based on absorption strength for various constituents are determined using statistical correlation analysis. Silicate band is found to be positively correlated with stretching modes of aliphatic hydrocarbons in NWA 852 and Tagish Lake. The former is highly correlated with the hydration band in all meteorites. Negative correlation is observed between water+organics and carbonate bands in all meteorites. Two dimensional infrared maps for NWA 852 and Orgueil show that carbonates are spatially separated from water+organic combination, silicates, OH, and CH distributions. Overlapping of the latter three in NWA 852 and Tagish Lake suggests a possible catalytic role of phyllosilicates in the formation of organics. Additionally, spectroscopic analyses on Sutter\u27s Mill meteorite fragments present multiple distinct mineralogies. Spatial and spectral evidences on this regolith breccia suggest mixing of multiple parent bodies. Ratios of asymmetric CH2 and CH3 band strengths for NWA 852, Tagish Lake, and Sutter\u27s Mill are similar to the average ratio of interplanetary dust particles and Wild 2 cometary dust particles, however significantly exceeds that of interstellar medium objects and several aqueously altered carbonaceous chondrites such as Orgueil. This suggests distinct formation regions and/or parent body processing of organics for these meteorites. Our infrared spectro-microtomography measurements on Murchison meteorite, representing the first such measurement on any kind of meteorite, comprise of three-dimensional reconstructions of specific molecular functional groups for understanding the spatial distributions of these groups

A detailed record of the BELARE 2019－2020 meteorite recovery expedition on the Nansen Ice Field, East Antarctica

2019－2020 年の夏期に，東南極セール・ロンダーネ山地南部においてベルギー南極観測隊（BELARE）により隕石探査を実施した．ナンセン氷原には，2020 年1 月15 日から2 月6 日まで23 日間滞在し，採取した隕石の総数は66 個，合計重量は約8 kg であった．ナンセン氷原での隕石集積機構を解明するために，隕石の他に氷，火山灰層や岩石の破片も採取した．採取した隕石は，凍結したまま国立極地研究所に輸送された．これら採取した隕石が国際隕石学会の隕石命名委員会に認可された後，分類データはMeteorite Newsletter で公開される．This report summarizes the Belgian Antarctic Expedition (BELARE) 2019－2020 meteorite search and recovery expedition near the Sør Rondane Mountains of East Antarctica during the 2019－2020 field season. This expedition took place from 15 January to 6 February 2020 within the area defined as ＂C＂ of the Nansen Ice Fields (S72°38\u27−72°48\u27S, 24°35\u27−25°06\u27E). The expedition team consisted of four scientists and two field guides, who systematically searched the ice field area and collected 66 meteorites. The total weight of the meteorites was determined to be ～8 kg. In addition to meteorites, blue ice samples, volcanic ash layers, and wind-blown terrestrial rock fragments were collected from the area to study in detail the nature of the mechanisms concentrating meteorites on the Nansen Ice Fields. The recovered meteorites were transported in a frozen state to the National Institute of Polar Research, Japan for dry-thawing and subsequent classification

Workplace Flexibility for Sustainable Career Satisfaction: Case of Handling in the Aviation Sector in North Cyprus

The purpose of this research was to find out how workplace flexibility affects the employees’ flexibility in order to increase their career satisfaction while reducing their workplace stress with the mediating role of goal orientation. Employees need workplace flexibility to develop a better sustainable career. In doing so, the relationship between workplace flexibility and career satisfaction can be affected by two different factors. One of them is job stress, which can be a mediating factor, and the second is goal orientation, which in this study was considered as a moderator between two variables. For this research, a quantitative research method was applied, and a survey was distributed to 216 respondents, namely, everyone working in handling in a single aviation sector of North Cyprus, to obtain better and clearer results from the respondents. A pilot test was completed and data were collected face-to-face in order to observe the reaction of respondents to develop better results and reduce any mistakes that could arise by answering the questionnaire. Moreover, in order to test the reliability of questionnaires, a pilot test was completed with 14% of the respondents and the results were evaluated by examining Cronbach’s alpha. Job stress is a negative term; therefore, surprisingly, there was a positive correlation between workplace flexibility and job stress in the findings. The results were discussed and specifically analyzed with the literature review. Findings of the article clarify that workplace flexibility, along with goal orientation, is expected to positively contribute to the sustainable career satisfaction of employees in the handling sector. This research will make an important contribution to the existing literature pertaining to flexible arrangements in the workplace, sustainable career satisfaction, job stress, and goal orientation, and will contribute to further theories in this field

Human Resource Management Practices and Service Provider Commitment of Green Hotel Service Providers: Mediating Role of Resilience and Work Engagement

Although research on human resource management practices (HRMPs) has been ongoing for many years, studies have actually paid little attention to HRMPs and their contribution to the emotional side of the bottom line or commitment to the external environment, particularly the serial mediation of HRMPs. Hence, to fill this research void, this study extends social exchange theory, broaden-and-build theory and the conservation of resources (COR) theory in the context of green hospitality by proposing a novel conceptual model to test the mediating effects of resilience and commitment between HRMPs (training, empowerment, and rewards) and service providers’ environmental commitment. A quantitative study was performed involving 557 participants at green hotels. The findings show that the components of HRMPs (training, rewards, and empowerment) were found to be crucial tools in encouraging service providers to engage in environmental tasks while green training, empowerment and reward systems can unlock environmental commitment (EEC) for the setting. In addition, environmental commitment increased by the contribution of two mediators, resilience and engagement; and interestingly, rewards did not contribute to the environmental resilience of service providers, while all three HRMPs had a positive influence on work engagement of service providers in the research context.publishedVersio

Carbonaceous matter in the Sariçiçek meteorite

As of today, the Sariçiçek (SC) meteorite is the newest howardite and the only confirmed fall among the 17 known howardites. In this study, we present isotopic, infrared, and Raman data on three distinct pieces of the SC meteorite. Our oxygen isotopic measurements show that Δ17O values of the pieces are close to each other, and are in good agreement with other howardites, eucrites, and diogenites. The carbon isotopic measurements, which were conducted by combusting terrestrial contamination selectively at temperatures lower than 500–600 °C, show the presence of indigenous carbon in the SC specimens. The matrix of these specimens, investigated via infrared microspectroscopy, appears to be dominated by clinopyroxene/orthopyroxene, forsterite, and fayalite, with minor contributions from ilmenite, plagioclase, and enstatite. Carbon‐rich regions were mapped and studied via Raman imaging microspectroscopy, which reveals that both amorphous and graphitic carbon exist in these samples. Synchrotron‐based infrared microspectroscopy data show the presence of very little aliphatic and aromatic hydrocarbons. The SC meteorite is suggested to be originating from the Antonia impact crater in the Rheasilvia impact basin on 4 Vesta (Unsalan et al. 2019). If this is in fact the case, then the carbon phases present in the SC samples might provide clues regarding the impactor material (e.g., carbonaceous chondrites)

Short-Term Results of Ivabradine versus Metoprolol: The Effects on Atrial Fibrillation in Patients Undergoing Off-Pump Coronary Artery Bypass Grafting

Introduction: Classic coronary artery bypass grafting (CABG) surgery involves diastolic cardiac arrest under cardiopulmonary bypass, while off-pump CABG (OPCABG) has become widespread in recent years. Methods: 174 patients who underwent OPCABG were included in the study. Patients were divided into two groups. Group I (n=90) received ivabradine and Group M (n=84) received metoprolol before surgery until postoperative day 10. Intraoperative arrhythmias and hypotension were recorded. Postoperative atrial fibrillation (AF) and arrhythmia, mortality and morbidity rates were assessed based on the 30-day postoperative follow-up. Results: There were no significant differences in the intraoperative amount of inotropic support and red blood cell transfusion between groups (P=0.87 and P=0.31). However, the rates of intraoperative arrhythmias and hypotension were not significantly higher in Group M (P=0.317 and P=0.47). Ventricular tachycardia/ventricular fibrillation (VT/VF) was observed in 2 patients in both groups. Postoperative AF occurred in 7 patients (7.7%) in Group I and in 10 patients (11.9%) in Group M. Although there was a trend towards a higher prevalence of AF in Group M patients, this did not reach statistical significance. In addition, mortality and morbidity rates were comparable between groups

The effectiveness of vacuum-assisted closure therapy in patients with infected venous leg ulcers

Aim: In this study, we aimed to investigate the effect of vacu-um-assisted closure therapy on venous stasis wound healing in patients with chronic venous leg ulcers. Methods: Vacuum-assisted closure therapy was applied on a total of 14 venous leg ulcers. All patients had post-thrombotic syndrome. Quantitative wound culture samples were obtained before the procedure and local wound assessments were performed. The primary outcome measures included wound healing as assessed by a local wound examination during each dressing change and the rate and velocity of ulcer reduc-tion. Wound healing was defined as the complete closure of the ulcer, while rapid wound healing was defined as a >= 30% reduction in the ulcer size by week four. Results: No surgical debridement or surgical corrective procedure was applied in any patient. The mean length of hospital stay was 32.3 days. The mean number of vacuum-assisted closure therapies for each case was 17.8 and the mean time to dressing change was 72.3 hours. Multidrug-resistant Pseudomonas aeruginosa and methicillin-resistant Staphylococcus aureus were detected in three and four patients, respectively. Wound culture results became negative after a mean duration of vacuum-assisted closure therapy of 12.1 days. None of the patients needed antibiotic therapy until the procedure was completed. Compared to baseline, the mean ulcer reduction rates were 46.4% for the first six applications and 72.8% for the subsequent applications. Conclusion: Our study results suggest that vacuum-assisted closure therapy promotes rapid wound healing in patients with severe post-thrombotic syndrome with venous stasis leg ulcers, and reduces the need for antibiotics by reducing the biological burden

Synchrotron-Based Three-Dimensional Fourier-Transform Infrared Spectro-Microtomography Of Murchison Meteorite Grain

We demonstrate nondestructive, three-dimensional, microscopic, infrared (IR) spectral in-situ imaging of an extraterrestrial sample. Spatially resolved chemical composition and spatial correlations are investigated within a single 45 µm grain of the Murchison meteorite. Qualitative and quantitative investigation through this analytical technique can help elucidate the origin and evolution of meteoritic compounds as well as parent body processes without damaging or altering the investigated samples

Infrared Surface Plasmon Polariton On Polyaniline-Graphite Composite

Conducting polymers are potentially useful materials in sensor applications. Polyaniline is one of the most promising of these materials due to high conductivity and plasma frequencies as high as the mid-infrared. The application of this material is still limited because of low conductivity. In this paper, we chemically prepared a composite of co-doped polyaniline with hydrochloric acid and MSA (methane sulfonic acid) in aqueous solution with both colloidal and nano-graphite. Solutions of the composite material were prepared in m-cresol and NMP (N-mthyle-2-pyrrolidone), which are common organic solvents. This approach resulted in material with conductivity higher than either intrinsic polyaniline or graphite alone. The solution of the composite was spin coated on suitable substrates. The thicknesses of the films were measured using atomic force microscope (AFM). Fourier transform infrared spectra (FTIR) and micro-Raman spectra were collected to confirm the composition and determine the infrared thickness. Surface plasmon resonances for grating patterns of this composite material were calculated using experimental determined infrared (IR) ellipsometry data. The goal is to identify a material which has potential application for surface plasmons resonance sensing with high sensitivity and selectivity in IR range. © 2012 SPIE

Patterning Of Oxide-Hardened Gold Black By Photolithography And Metal Lift-Off

A method to pattern infrared-absorbing gold black by conventional photolithography and lift-off is described. A photo-resist pattern is developed on a substrate by standard photolithography. Gold black is deposited over the whole by thermal evaporation in an inert gas at ∼1 Torr. SiO2 is then deposited as a protection layer by electron beam evaporation. Lift-off proceeds by dissolving the photoresist in acetone. The resulting sub-millimeter size gold black patterns that remain on the substrate retain high infrared absorption out to ∼5 μm wavelength and exhibit good mechanical stability. This technique allows selective application of gold black coatings to the pixels of thermal infrared imaging array detectors. © 2013 Elsevier B.V. All rights reserved