NGC 7027: Probing the kinematics and excitation conditions of the warm molecular gas

2011 ◽  
Vol 7 (S283) ◽  
pp. 498-499
Author(s):  
Miguel Santander-García ◽  
Valentín Bujarrabal ◽  
Javier Alcolea

AbstractTracking the mass-loss history of planetary nebulae (PNe) by means of molecular emission lines (mainly mm and sub-mm ranges) is fundamental to gain insight into the mechanism of nebular shaping. This is particularly important in cases such as NGC 7027, where most of the nebula is constituted by molecular gas (85% of a total of 1.4 M⊙, see Fong et al. 2001).To this aim, Herschel/HIFI provides an invaluable tool to probe warm molecular gas (~50-1000 K). It produces 1-D, high resolution spectra of the whole nebula (convolved with the telescope beam) in high-excitation molecular transitions (e.g. CO J=6–5, 10–9 and 16–15). Although the morphological information is therefore lost, the kinematics and the excitation conditions can be studied with unprecedented detail (see (see Bujarrabal et al. 2011).).We have developed a code, shapemol, which, used along the existing SHAPE software (Steffen et al. 2010), implements spatiokinematical modeling with accurate non-LTE calculations of line excitation and radiative transfer in molecular species. The high quality of the data, together with this code, have allowed us to study, for the first time, the kinematics and excitation conditions of the warm gas of a PN with such a high-excitation.

2021 ◽  
Vol 37 (2) ◽  
pp. 149-165
Author(s):  
Andrew Barrette ◽  

This paper investigates a moment in the history of the phenomenological movement and offers an argument for its enduring significance. To this end, it brings to light, for the first time in a half-century, Manfred Frings’ rejected and so unpublished translation of Edmund Husserl’s Ideas II. After considering the meaning of the term Leib, which Frings renders ‘lived-body’ and to which the editor suggests ‘organism,’ a brief argument for the living tradition of phenomenology is given. It is claimed that the enduring significance of the document is found in the elucidation of the need to renew the phenomenological tradition through a collaboration across generations. Thus, even in its supposed “failure,” Frings’ translation gives data to future thinkers for insight into both their own life and the life of the ideas of phenomenology itself.


2016 ◽  
Vol 12 (3) ◽  
pp. 840 ◽  
Author(s):  
Adrián Pastor-Barceló ◽  
Vicente Prado-Gascó ◽  
Pilar Bustillo-Casero

Purpose: This research focuses on the construction and validation of a scale designed to assess the quality of the supervised classes: Interaction on Supervised Classes Scale (ISCS).Design/methodology/approach: This is a descriptive correlational study. For the construction of the scale three phases were performed in which different experts assessed the adequacy of the items. Finally, the psychometric properties of the final version were studied in a sample of 314 consumers (69.1% women) aged between 18 and 77 with an average of 39.33 years (SD=12.25).Findings: The scale presents adequate validity and reliability, being a useful tool for measuring the interaction in Supervised Classes.Research limitations/implications: The sampling, non-probabilistic or convenience, have taken the sample of a unique sports facility and the small sample size.Practical implications: The ISCS allows managers to receive better feedback, allowing them to obtain deeper insight into the quality and satisfaction of the service. According to its results, the managers may implement different strategies to improve quality in a key service within sports centers.Originality/value: For the first time the interaction between customers and between customers and employees is evaluated both inside and outside the center, a topic that had not yet been studied in the scientific literature. The scale can be applied to any type of directed activity, and will allow a greater understanding of the quality of service.


Author(s):  
Suwat Janyapoon ◽  
Jirapan Liangrokapart ◽  
Albert Tan

Business intelligence (BI) has become a popular among management executives of different industries. Many publications have mentioned Big Data and how to use data intelligently. However, little is known about how to successfully implement BI in the healthcare industry. The unique characteristic of this business, which focuses only on quality of care and patient safety, has a big impact on decision-making. This research is based on a literature review and empirical evidence collected from interviews with professionals involved in the healthcare industry. Twenty-four hospital executives and Information Technology staff who have direct or indirect experience with BI were interviewed. It investigates critical success factors for BI implementation in hospitals and provides insight into the healthcare industry in Thailand. The concept of grounded theory was applied for content analysis. Insights from this research contribute to academia and the healthcare industry by providing first-time evidence of specific factors for BI implementation and guidelines in hospitals.


2003 ◽  
Vol 212 ◽  
pp. 732-733
Author(s):  
Anthony P. Marston

Optically observed ring nebulae and H i cavities around Wolf-Rayet stars have enabled us to obtain information on the history of mass-loss associated with these massive evolved stars. However, such studies have left a number of unanswered questions regarding the amount of mass-loss and the conditions of the stars during a sequence of mass-loss phases. Here we discuss the molecular gas environments of the WR star WR 18, which has an associated optical ring nebula NGC 3199. Our observations show that significant amounts of molecular gas appear close to and associated with the star. Mapping of molecular CO near the star shows that molecular materials appear to substantially avoid areas of optical emission and, instead, form a distorted clumpy shell interior to NGC 3199. Molecular emission lines are broader than lines seen in the interstellar medium and suggest the shell is composed of ejecta. This is further corroborated by the enhanced abundances of molecules containing C, N and O. Implications of the observations for the evolution of WR 18 are discussed.


1998 ◽  
Vol 11 (2) ◽  
pp. 1131-1133 ◽  
Author(s):  
Alan F. M. Moorwood

All the ISO instruments are contributing to the study of activity in galaxies of essentially all types. Although AGN's as such are pointlike, the beautiful CAM image of CenA shown by Catherine Cesarsky has given us the clearest view so far of its visually obscured nucleus and surrounding spiral disc embedded in an elliptical galaxy. The CAM CVF is also providing spectral images of the PAH features and important diagnostic ionic lines (e.g [NeII] and [NeIII]) in the circumnuclar regions of AGN and merging starburst systems (Vigroux et al., 1996). PHT is providing detailed spectral energy distributions over the complete 2.5-240µm range and PHTS is proving invaluable for assembling a catalogue of low resolution (R ⋍ 90) galaxy spectra covering the 6-12µm PAH features. SWS and LWS are generating higher resolution (R ⋍ 2000-200) spectra over the range 2.5-200µm such as that shown in Fig. 1. of the Circinus galaxy which exhibits both AGN and starburst activity and well illustrates the wide range of diagnostic features, many seen for the first time, accessible to ISO studies of galaxies. It shows the overall continuum with a peak around 100µm; PAH features and Si absorption which dominate the spectrum around 10µm; H recombination lines; H2 pure rotational emission lines; low ionization potential ionic lines excited by starburst activity and high excitation lines (up to ⋍ 300eV) excited by the visually obscured AGN.


1999 ◽  
Vol 13 (3) ◽  
pp. 385-408 ◽  
Author(s):  
SHARLENE HESSE-BIBER ◽  
MARGARET MARINO ◽  
DIANE WATTS-ROY

This study provides insight into factors that determine whether women in the college population who exhibit eating-disordered behavior during their college years recover during their postcollege years. The study assessed changes in the eating patterns of 21 women across a six-year time period, from sophomore year in college to two years postcollege. Eleven of the women get better during their postcollege year, whereas 10 of the women continue to struggle with disordered eating. The major differences between the two groups revolve around the relationship between autonomy and relation. Women who get better negotiate the tension between autonomy and relatedness and are more likely to have higher selfesteem based on a more positive self-concept; this, in turn, leads to healthier relationships with food and body image. Two factors that appear to influence this negotiation include (I) one's history of chronic physical or sexual abuse and (2) the quality of familial messages about food, body image, relationship, and autonomy.


Author(s):  
Jacek Reginia-Zacharski

Ukrainian lands in the twentieth and twenty-first centuries have been in proximity of great geopolitical changes several times. During that time the Ukrainian nation – due to various factors – encountered a number of “windows of opportunity” for achieving the realization of dreams about independence and national sovereignty. The author identified in the period considered four “general moments,” of which two have been completed successfully. The first of these occurred in 1990–1991, when for the first time in modern history, Ukrainians managed to achieve a lasting and relatively stable independence. The second of the “moments” – still unresolved – are events that began in the late autumn of 2013. The process, called “Revolution of Dignity”, represents a new quality in the history of the Ukrainian nation, therefore, that the Ukrainians have to defend the status quo (independence, territorial integrity, sovereignty, etc.) but not to seek to achieve an independent being. The analysis leads to the conclusion that the ability of Ukrainians to achieve and maintain independence is largely a function of the relative power of the Russian state as measured with respect to the shape and quality of international relations.


2021 ◽  
pp. 1-10
Author(s):  
Aurélien Montel

Abstract Given the lack of local sources, the history of Tripoli as a global Mediterranean city remains unclear until the Ottoman conquest of the 16th century. Given that documentary record, the exploration of the rich Arabic tradition written in al-Andalus provides a fresh insight into how Tripoli constructed its Mediterranean stature prior to the 11th century. First, the systematic analysis of Islamic biographical literature (ṭabaqāt) shows Tripoli was one of the most visited cities by the Andalusian scholars across the Islamic world. It also reveals they were in close contact with the Tripolitanian Mālikī networks. Eventually, The Tripolitanian elites took advantage, of that specific Andalusian connection, and using the rivalry between the caliphal powers at the dawn of the 11th century they assured the independence of the city for the first time while rejecting the Fatimid-Zirid power and recognizing the sovereignty of the Spanish Umayyads.


2005 ◽  
Vol 118 (3-4) ◽  
pp. 131-202
Author(s):  
Edwin Buijsen

AbstractThis article presents for the first time fifteen red chalk drawings by Adriaen Pietersz. van de Venne (I589-I662) as a cohesive group (catalogue in appendix i). Not only do they share the same drawing material, but they are also characterized by a careful execution and a high degree of finish. A distinct connection with Adriaen van de Venne's painted œuvre can be established: in no fewer than nine cases (cat. nos. 4, 5, 6, 7, 8, 9, II, I2 and I4) do the representation and measurements of the red chalk drawing correspond with a painting by Van de Venne. Although no paintings could yet be found which correspond with the remaining red chalk drawings it is highly likely that they did exist because the measurements of four of them (cat. nos. I, 2, 3 and I0) are consistent with panel formats frequently used by Van de Venne. Are these red chalk drawings detailed preliminary studies for the paintings, or faithful copies made afterwards? To answer this question four of the paintings which correspond with red chalk drawings were examined with infrared reflectography (IRR) or infrared photography so as to reveal the underdrawing. Three of the examined paintings (cat. no. 4, fig. a; cat. no. 7, fig. a; cat. I2, fig. a) show roughly executed underdrawings with numerous differences from the finished paintings. On the other hand, the corresponding red chalk drawings are highly detailed and identical with the finished paintings, without any visible alterations. Therefore we may conclude that they were not meant as preliminary studies but made subsequently. In the case of the fourth examined painting (cat. 9, fig. a) the situation is more complicated because the underdrawing has a more accurate and definitive character. However, this is exceptional in Van de Venne's œuvre : IRR research into a large number of his paintings has shown that he customarily made a sketchy underdrawing which was elaborated during the painting stage. This makes it all the more likely that in general the detailed red chalk drawings had no part in the genesis of the paintings, but were made subsequently. For reproducing the finished paintings the artist may have used mechanical transfer methods such as pouncing or tracing. Only one of the red chalk drawings (cat. no. I5) can be identified as a design made especially for a print. This small drawing which shows the portrait of Van de Venne himself also occupies a special position within the group because of its subject matter and size. An inscription on the reverse led Martin Royalton-Kisch to suggest that this and all other red chalk drawings were not executed by Adriaen van de Venne but by the engraver Daniel van den Bremden (I586/I587 -in or after I650?), as designs for prints. However, the reliability of the inscription on the reverse of cat. no. I5 is doubtful and because of the representative character of the portrait it seems most likely that Van de Venne himself was the author. While the style of the red chalk drawings differs from most of the drawings which Van de Venne executed in other materials (chiefly pen and ink), as was already noticed by Royalton-Kisch, there is a connection with a large drawing on parchment dated I638 and entitled 'Elk sijn gading' (Something for everyone; fig. I4) which is also carefully executed and displays a high degree of finish. An additional argument to exclude the engraver Van den Bremden as the author of the red chalk drawings is the fact that with the exception of the aforementioned portrait (cat. no. I5) none of them ever appeared in print. If the red chalk drawings after paintings by van de Venne were not meant for prints, what function can they have had? An obvious possibility is that the artist wanted to document his works visually before they left the studio. Other seventeenth-century painters, such as members of the De Braij family, are known to have created similar studio archives. Because Van de Venne's artistic production was characterized by countless repetitions and variants of the same compositions, not only in his paintings but also in his designs for book illustrations, he will certainly have wanted to register successful inventions for the purpose of making repeated use of them. Furthermore, the red chalk drawings may have served other purposes, for example to enable prospective clients to select variants or copies of existing works. Proceeding from a function as a studio archive, there is sufficient reason for localizing the red chalk drawings in Van de Venne's studio. In view of the high quality of their craftsmanship, by far the majority appears to be authentic; in a few cases a pupil may have been recruited for copying one of his master's paintings. That more red chalk drawings must have existed than the fifteen currently known can be deduced from the survey of drawings in this material for which only written sources survive (appendix II). It is to be hoped that the discovery of as yet unknown examples will provide a deeper insight into this aspect of Van de Venne's artistic output.


2001 ◽  
Vol 57 (3) ◽  
pp. 399-409 ◽  
Author(s):  
Stella Makedonopoulou ◽  
Konstantina Yannakopoulou ◽  
Demetrios Mentzafos ◽  
Victor Lamzin ◽  
Alexander Popov ◽  
...  

The enantiomers of racemic olive fly sex pheromone 1,7-dioxaspiro[5.5]undecane (1) have been isolated by crystallization with enantiospecific cyclodextrin hosts: (S)-(1) crystallizes with heptakis(2,3,6-tri-O-methyl)-β-cyclodextrin (TMβCD) and (R)-(1) with hexakis(2,3,6-tri-O-methyl)-α-cyclodextrin (TMαCD). The crystal structure of TMβCD/(S)-(1) from synchrotron radiation data at 100 K, determined for the first time, proves that TMβCD crystallizes with only the (S)-enantiomer from the racemic mixture. Comparison with the 100 K structure of TMαCD/(R)-(1) redetermined with synchrotron data has provided insight into the interactions between each of the hosts with the corresponding enantiomeric guests. Owing to the high resolution of the data and the unusually high quality of the crystals, localization of the H atoms has been achieved, a rare accomplishment for cyclodextrin X-ray structures. This made possible, apart from the geometry of the complexes, the detailed description of a five-membered-ring water cluster with very well ordered hydrogen bonding. The enantiospecificity exhibited by the described systems reveals the subtle differences of the weak intermolecular forces involved in the selective binding of the two optical antipodes by the two hosts. The binding geometry in the two complexes is different, but it is effected in both by numerous host–guest C—H...O interactions, resulting from induced fit of the hosts toward each of the enantiomeric guests. In TMαCD/(R)-(1) two of these H...O host–guest distances, directed toward the acetal O atoms defining the chirality of the guest, are much shorter than the rest and also shorter than all the H...O distances in TMβCD/(S)-(1). Moreover, (R)-(1) interacts not only with the enclosing host, but with other hosts in the crystal lattice, in contrast to (S)-(1) in the TMβCD/(S)-(1) complex which is isolated inside channels formed by the host molecules. The above differences are reflected in the much higher binding constant of TMαCD/(R)-(1) compared with that of TMβCD/(S)-(1) (∼6800 and ∼935 M−1, respectively), determined by NMR in aqueous solution, and the ability of TMαCD to selectively precipitate (R)-(1) from racemic (1) in much higher yield than TMβCD precipitates (S)-(1).


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