scholarly journals Deeply Buried Nuclei in the Infrared-luminous Galaxies NGC 4418 and Arp 220. II. Line Forests at λ = 1.4–0.4 mm and Circumnuclear Gas Observed with ALMA

2021 ◽  
Vol 923 (2) ◽  
pp. 240
Author(s):  
Kazushi Sakamoto ◽  
Sergio Martín ◽  
David J. Wilner ◽  
Susanne Aalto ◽  
Aaron S. Evans ◽  
...  
Keyword(s):  
Galactic Disk ◽  
Vibrationally Excited ◽  
Content Type ◽  
Counter Rotation ◽  
Luminous Galaxies ◽  
Line Absorption ◽  
Type Object ◽  
Upper Level ◽  
Array Imaging ◽  
The Continuum

Abstract We present the line observations in our Atacama Millimeter-Submillimeter Array imaging spectral scan toward three deeply buried nuclei in NGC 4418 and Arp 220. We cover 67 GHz in f rest = 215–697 GHz at about 0.″2 (30, 80 pc) resolution. All the nuclei show dense line forests; we report our initial line identification using 55 species. The line velocities generally indicate gas rotation around each nucleus, tracing nuclear disks of ∼100 pc in size. We confirmed the counter-rotation of the nuclear disks in Arp 220 and that of the nuclear disk and the galactic disk in NGC 4418. While the brightest lines exceed 100 K, most of the major lines and many 13C isotopologues show absorption against even brighter continuum cores of the nuclei. The lines with higher upper-level energies, including those from vibrationally excited molecules, tend to arise from smaller areas, indicating radially varying conditions in these nuclei. The outflows from the two Arp 220 nuclei cause blueshifted line absorption below the continuum level. The absorption mostly has small spatial offsets from the continuum peaks to indicate the outflow orientations. The bipolar outflow from the western nucleus is also imaged in multiple emission lines, showing the extent of ∼1″ (400 pc). Redshifted line absorption against the nucleus of NGC 4418 indicates either an inward gas motion or a small collimated outflow slanted to the nuclear disk. We also resolved some previous confusions due to line blending and misidentification.

Thermo-structural analysis of a honeycomb-type volumetric absorber for concentrated solar power applications

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Masoud Behzad ◽  
Benjamin Herrmann ◽  
Williams R. Calderón-Muñoz ◽  
José M. Cardemil ◽  
Rodrigo Barraza
Keyword(s):  
Heat Transfer ◽  
Thermal Stress ◽  
Steady State ◽  
Discrete Model ◽  
Continuum Model ◽  
Transient State ◽  
Operating Conditions ◽  
Steady State Condition ◽  
Content Type ◽  
The Continuum

Purpose Volumetric air receivers experience high thermal stress as a consequence of the intense radiation flux they are exposed to when used for heat and/or power generation. This study aims to propose a proper design that is required for the absorber and its holder to ensure efficient heat transfer between the fluid and solid phases and to avoid system failure due to thermal stress. Design/methodology/approach The design and modeling processes are applied to both the absorber and its holder. A multi-channel explicit geometry design and a discrete model is applied to the absorber to investigate the conjugate heat transfer and thermo-mechanical stress levels present in the steady-state condition. The discrete model is used to calibrate the initial state of the continuum model that is then used to investigate the transient operating states representing cloud-passing events. Findings The steady-state results constitute promising findings for operating the system at the desired airflow temperature of 700°C. In addition, we identified regions with high temperatures and high-stress values. Furthermore, the transient state model is capable of capturing the heat transfer and fluid dynamics phenomena, allowing the boundaries to be checked under normal operating conditions. Originality/value Thermal stress analysis of the absorber and the steady/transient-state thermal analysis of the absorber/holder were conducted. Steady-state heat transfer in the explicit model was used to calibrate the initial steady-state of the continuum model.

A secondary analysis of the library profession’s self-reported competence and comfort in working with patrons with disabilities

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
JJ Pionke
Keyword(s):  
Graduate School ◽  
Information Science ◽  
Secondary Analysis ◽  
Assistive Technologies ◽  
Library And Information Science ◽  
Published Data ◽  
Content Type ◽  
Current State ◽  
Practical Implications ◽  
The Continuum

PurposeThis article presents a secondary analysis of previously published data in order to drive discussion of the library profession’s current state of preparedness in working with patrons with disabilities.Design/methodology/approachThis article used a secondary analysis of survey data that have been previously published to determine what the continuum of data said about the current state of preparedness in the profession when working with people with disabilities.FindingsA comparison of the data from both surveys reveals that there are not only gaps in library graduate school education related to disability and accessibility but also that those gaps are not being addressed through professional development and staff training after students enter the workforce.Research limitations/implicationsThis was a secondary analysis of data, so no new data could be added. There was also no representation from library graduate school administration.Practical implicationsAn awareness is built that there needs to be more instruction for library graduate students and library employees on topics related to disability, accessibility and assistive technologies.Originality/valueThe topic has never been studied before in this kind of continuum of data, and the use of the secondary analysis of data with the library and information science profession is exceedingly rare.

Satisfaction with democracy and social capital in Greece

2018 ◽  
Vol 45 (4) ◽  
pp. 614-628 ◽  
Author(s):  
Irene Daskalopoulou
Keyword(s):  
Social Capital ◽  
Multivariate Regression Analysis ◽  
Political Organization ◽  
Content Type ◽  
Satisfaction With Democracy ◽  
The Social ◽  
Different Types ◽  
European Values ◽  
The Relationship ◽  
The Continuum

Purpose The purpose of this paper is to investigate how different types of social capital contribute to the satisfaction with democracy (SWD) in Greece. Understanding the relationship between different variants of social capital and SWD allows one to situate the Greek democracy in the continuum of democracy types, from primary to modern. Design/methodology/approach The study uses microdata extracted from the European Values Surveys of 2002-2010 and multivariate regression analysis. Findings The results are compatible with a conception of the Greek political organization as a civil virtue democracy. A change in the nature of the relationship is observed after the recent economic crisis in the country. Research limitations/implications The study contributes to the empirical knowledge regarding the relationship between different variants of social capital and SWD. Originality/value Using a typology approach, the micro-relationship between democracy and social capital is analyzed as embedded in a continuum of different democracy types. In addition, this is the first study that uses microdata to analyze the effect of social capital upon SWD in Greece. The results of the study provide valuable understanding of the social and institutional arrangements that might sustain Greece’s efforts to meet its overall developmental challenges.

Follow-the-leader motion strategy for multi-section continuum robots based on differential evolution algorithm

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
GuoHua Gao ◽  
Pengyu Wang ◽  
Hao Wang
Keyword(s):  
Differential Evolution ◽  
Kinematic Model ◽  
Differential Evolution Algorithm ◽  
Open Loop ◽  
Continuum Robots ◽  
Content Type ◽  
Loop Control ◽  
Continuum Robot ◽  
Motion Strategy ◽  
The Continuum

Purpose The purpose of this paper is to present a follow-the-leader motion strategy for multi-section continuum robots, which aims to make the robot have the motion ability in a confined environment and avoid a collision. Design/methodology/approach First, the mechanical design of a multi-section continuum robot is introduced and the forward kinematic model is built. After that, the follow-the-leader motion strategy is proposed and the differential evolution (DE) algorithm for calculating optimal posture parameters is presented. Then simulations and experiments are carried out on a series of predefined paths to analyze the performance of the follow-the-leader motion. Findings The follow-the-leader motion can be well performed on the continuum robots this study proposes in this research. The experimental results show that the deviation from the path is less than 9.7% and the tip error is no more than 15.6%. Research limitations/implications Currently, the follow-the-leader motion is affected by the following factors such as gravity and continuum robot design. Furthermore, the position error is not compensated under open-loop control. In future work, this paper will improve the accuracy of the robot and introduce a closed-loop control strategy to improve the motion accuracy. Originality/value The main contribution of this paper is to present an algorithm to generate follow-the-leader motion of the continuum robot based on DE. This method is suitable for solving new arrangements in the process of following a nonlinear path. Then, it is expected to promote the engineering application of the continuum robot.

Problems in the Formation of Neutral Helium Lines in Early Type Stars

1970 ◽  
Vol 1 (7) ◽  
pp. 326-328
Author(s):  
R. W. Simpson
Keyword(s):  
Absorption Coefficient ◽  
Electron Scattering ◽  
Growth Analysis ◽  
Line Profiles ◽  
Early Type ◽  
Line Absorption ◽  
Early Type Stars ◽  
Made In ◽  
The Continuum

The aim of this work is to investigate certain assumptions that have been made in calculating line profiles and equivalent widths of neutral helium lines in early type stars. The effect of electron scattering on the continuum flux is investigated and a curve of growth analysis carried out to study this effect. The theories involved in calculating the line absorption coefficient are also investigated.

Pricing and scholarship optimization at waypoint adventure

2020 ◽  
Vol 16 (4) ◽  
pp. 475-495
Author(s):  
Benjamin Marcus
Keyword(s):  
Operations Management ◽  
Optimization Techniques ◽  
Content Type ◽  
Non Profit ◽  
Participant Engagement ◽  
Academic Level ◽  
The Disabled ◽  
Upper Level ◽  
Instructor's Manual ◽  
Revenue And Pricing Management

Theoretical basis This case can be used to develop students’ understanding of optimization and the development of a linear programing (LP) model and solution. The instructor’s manual provides one possible solution based on the LP tools available in excel. Research methodology This case is based on real events at waypoint adventure and is derived from the authors’ experience consulting with this organization as they sought to improve pricing and scholarship management. Case overview/synopsis A young non-profit organization serving the disabled community in Boston sought growth but lacked clarity and consistency in their program pricing and scholarship structures. The case analysis centers on revising program prices to achieve specific cost and revenue requirements and determining a scholarship policy that will maximize participation in their outdoor adventure programing for the upcoming year. This case allows the exploration of optimization with an atypical objective, as the organization seeks to maximize participant engagement rather than profit. Complexity academic level The target audience includes upper-level undergraduate and MBA or early graduate-level students studying the optimization techniques of operations management, revenue and pricing management or marketing. The case would also be useful for discussing the challenges faced by non-profits and the non-traditional objectives that can arise for these organizations.

scholarly journals The corporate identity, total corporate communications, stakeholders’ attributed identities, identifications and behaviours continuum

2017 ◽  
Vol 51 (9/10) ◽  
pp. 1472-1502 ◽  
Author(s):  
John M.T. Balmer
Keyword(s):  
Social Identity ◽  
Stakeholder Theory ◽  
Identity Management ◽  
Legal Theory ◽  
Corporate Identity ◽  
Company Law ◽  
Corporate Communications ◽  
Content Type ◽  
Framework Approach ◽  
The Continuum

Purpose This paper aims to introduce a new integrated strategic framework entitled, “The corporate identity, total corporate communications, stakeholders’ attributed identities, identifications and behaviours continuum” and elucidates the central and strategic importance of corporate identity apropos corporate communications, corporate image, attributed stakeholder identifications and resultant behaviours. The strategic importance of corporate identity is noted. The continuum incorporates a variety of disciplinary/theoretical perspectives. Design/methodology/approach The paper/framework is informed by corporate marketing and strategic perspectives; legal theory of the firm; social identity branch theories; and stakeholder theory. The effects and management of corporate identity are seen as a continuum. The framework accommodates Tagiuri’s (1982) scholarship on corporate identity. Findings This paper formally introduces and explicates “The corporate identity, total corporate communications, stakeholders’ attributed identities, identifications and behaviours continuum”. Corporate identity management is an on-going strategic senior management/strategic requisite. Notably, the legal theory of company law – routinely overlooked – and its impact on corporate identity management is accepted, acknowledged and accommodated. The importance of stakeholders and stakeholder identification (a derivative of social identity theory) is underscored. Practical implications Via the explication of the continuum, managers can comprehend the nature and importance of corporate identity; appreciate that corporate identity adaptation/change is on-going; comprehend its interface/s with corporate communications, stakeholder attributed identities, identifications and the business environment; understand the need for on-going fidelity to an institution’s legally based core purposes and corporate identity traits (juridical identity); cognise the efficacy of constant stakeholder and environmental analysis. Corporate identity sustainability requires corporate identity to be advantageous, beneficial, critical, differentiating and effectual. Stakeholder prioritisation is not solely dependent on power, legitimacy and urgency but on legality, efficacy, ethicality and temporality. Originality/value The resultant framework/approach, therefore, aims to make a meaningful advance on the territory and, moreover, seeks to be of utility to scholars and practitioners of corporate marketing, strategy and company law. Arguably, therefore, the framework is more ambitious than extant framework on the domain. The resultant framework/approach, therefore, aims to make a meaningful advance on the territory and seeks to be of utility to scholars and practitioners of corporate identity, communications, images, identification, stakeholder theory, company law and, importantly, corporate strategy.

Contextualizing library assessment within a broader ecosystem

2018 ◽  
Vol 19 (1) ◽  
pp. 18-29 ◽  
Author(s):  
Christine Madsen ◽  
Megan Hurst
Keyword(s):  
Large Scale ◽  
Lessons Learned ◽  
Library Directors ◽  
Content Type ◽  
Library Assessment ◽  
Current State ◽  
Strategic Assessment ◽  
Culture Of Assessment ◽  
Assessment Performance ◽  
The Continuum

Purpose The purpose of this paper is to draw a picture of the current landscape of library assessment based on the data gathered in interviews. The authors will focus specifically on the continuum between micro and strategic assessment and share the lessons learned from diverse institutions and geographies about how to build a culture of assessment. Design/methodology/approach Between 2015 and 2017, the researchers have interviewed more than 75 library directors and leaders, library assessment practitioners, and academic experts on four continents about library assessment and its current state in their institutions. Findings The results reveal a varied landscape, with libraries in widely varying stages of assessment performance and readiness. Originality/value This paper presents the results of a large-scale study over more than two years. More than 75 people have been interviewed in five countries. The scale and scope of the work is both significant and unique.

Study on multi-section continuum robot wire-tension feedback control and load manipulability

2020 ◽  
Vol 47 (6) ◽  
pp. 837-845
Author(s):  
Azamat Nurlanovich Yeshmukhametov ◽  
Koichi Koganezawa ◽  
Zholdas Buribayev ◽  
Yedilkhan Amirgaliyev ◽  
Yoshio Yamamoto
Keyword(s):  
Control Method ◽  
Tension Control ◽  
Estimation Model ◽  
Content Type ◽  
Wire Tension ◽  
Payload Capacity ◽  
Continuum Robot ◽  
Continuum Manipulators ◽  
And Control ◽  
The Continuum

Purpose The purpose of this paper is to present a novel hybrid pre-tension mechanism for continuum manipulators to prevent wire slack and improve continuum robot payload capacity, as well as to present a new method to control continuum manipulators’ shape. Design/methodology/approach This research explains the hardware design of a hybrid pre-tension mechanism device and proposes a mathematic formulation wire-tension based on robot design. Also, the wire-tension control method and payload estimation model would be discussed. Findings Wire-tension is directly related to the continuum manipulators’ rigidity and accuracy. However, in the case of robot motion, wires lose their tension and such an issue leads to the inaccuracy and twist deformation. Therefore, the proposed design assists in preventing any wire slack and derailing the problem of the wires. Originality/value The novelty of this research is proposed pre-tension mechanism device design and control schematics. Proposed pre-tension mechanism designed to maintain up to eight wires simultaneously.

scholarly journals “When I saw my peers annotating”

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Jeremiah Holden Kalir ◽  
Esteban Morales ◽  
Alice Fleerackers ◽  
Juan Pablo Alperin
Keyword(s):  
Undergraduate Students ◽  
Student Perception ◽  
Perceived Value ◽  
Learning Technology ◽  
Digital Resources ◽  
Content Type ◽  
Course Content ◽  
Social Annotation ◽  
Upper Level ◽  
Practical Implications

Purpose Social annotation (SA) is a genre of learning technology that enables the annotation of digital resources for information sharing, social interaction and knowledge production. This study aims to examine the perceived value of SA as contributing to learning in multiple undergraduate courses. Design/methodology/approach In total, 59 students in 3 upper-level undergraduate courses at a Canadian university participated in SA-enabled learning activities during the winter 2019 semester. A survey was administered to measure how SA contributed to students’ perceptions of learning and sense of community. Findings A majority of students reported that SA supported their learning despite differences in course subject, how SA was incorporated and encouraged and how widely SA was used during course activities. While findings of the perceived value of SA as contributing to the course community were mixed, students reported that peer annotations aided comprehension of course content, confirmation of ideas and engagement with diverse perspectives. Research limitations/implications Studies about the relationships among SA, learning and student perception should continue to engage learners from multiple courses and from multiple disciplines, with indicators of perception measured using reliable instrumentation. Practical implications Researchers and faculty should carefully consider how the technical, instructional and social aspects of SA may be used to enable course-specific, personal and peer-supported learning. Originality/value This study found a greater variance in how undergraduate students perceived SA as contributing to the course community. Most students also perceived their own and peer annotations as productively contributing to learning. This study offers a more complete view of social factors that affect how SA is perceived by undergraduate students.

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