35 research outputs found
The impact of a young radio galaxy: clues from the cosmic ray electron population
No full textIn the framework of hierarchical structure formation, active galactic nuclei (AGN) feedback shapes the galaxy luminosity function. Low luminosity, galaxy-scale double radio sources are ideal targets to investigate the interplay between AGN feedback and star formation. We use Very Large Array and BIMA millimetre-wave array observations to study the radio continuum emission of NGC 3801 between 1.4 and 112.4 GHz. We find a prominent spectral break at ~10 GHz, where the spectrum steepens as expected from cosmic ray electron (CRe) ageing. Using the equipartition magnetic field and fitting JP models locally, we create a spatially resolved map of the spectral age of the CRe population. The spectral age of τint = 2.0 ± 0.2 Myr agrees within a factor of 2 with the dynamical age of the expanding X-ray emitting shells. The spectral age varies only little across the lobes, requiring an effective mixing process of the CRe such as a convective backflow of magnetized plasma. The jet termination points have a slightly younger CRe spectral age, hinting at in situ CRe re-acceleration. Our findings support the scenario where the supersonically expanding radio lobes heat the interstellar medium (ISM) of NGC 3801 via shock waves, and, as their energy is comparable to the energy of the ISM, are clearly able to influence the galaxy's further evolution
The impact and effectiveness of marketing orientation and environmental marketing among firms in Saudi Arabia
No full textSubmission note: A thesis submitted in total fulfilment of the requirements for the degree of Doctor of Philosophy to the School of Business, Faculty of Law and Management, La Trobe University, Bundoora.Restrictions: Thesis is embargoed indefinitely.This thesis has been embargoed indefinitely at the request of the author and approval of the academic board
Aerodynamic Characterization of a Tethered Rotor
No full textabstract: An airborne, tethered, multi-rotor wind turbine, effectively a rotorcraft kite, provides one platform for accessing the energy in high altitude winds. The craft is maintained at altitude by its rotors operating in autorotation, and its equilibrium attitude and dynamic performance are affected by the aerodynamic rotor forces, which in turn are affected by the orientation and motion of the craft. The aerodynamic performance of such rotors can vary significantly depending on orientation, influencing the efficiency of the system. This thesis analyzes the aerodynamic performance of an autorotating rotor through a range of angles of attack covering those experienced by a typical autogyro through that of a horizontal-axis wind turbine. To study the behavior of such rotors, an analytical model using the blade element theory coupled with momentum theory was developed. The model uses a rigid-rotor assumption and is nominally limited to cases of small induced inflow angle and constant induced velocity. The model allows for linear twist. In order to validate the model, several rotors -- off-the-shelf model-aircraft propellers -- were tested in a low speed wind tunnel. Custom built mounts allowed rotor angles of attack from 0 to 90 degrees in the test section, providing data for lift, drag, thrust, horizontal force, and angular velocity. Experimental results showed increasing thrust and angular velocity with rising pitch angles, whereas the in-plane horizontal force peaked and dropped after a certain value. The analytical results revealed a disagreement with the experimental trends, especially at high pitch angles. The discrepancy was attributed to the rotor operating in turbulent wake and vortex ring states at high pitch angles, where momentum theory has proven to be invalid. Also, aerodynamic design constants, which are not precisely known for the test propellers, have an underlying effect on the analytical model. The developments of the thesis suggest that a different analytical model may be needed for high rotor angles of attack. However, adding a term for resisting torque to the model gives analytical results that are similar to the experimental values.Dissertation/ThesisMasters Thesis Mechanical Engineering 201
Gender in Shakespeare: Automatic Stylistics Gender Character Classification Using Syntactic, Lexical and Lemma Features
No full textFor a variety of text types, methods for automatically determining the gender of a document’s author can now reliably achieve accuracy of at least 70-80%. Our aim here is to extend this research, to examine determining the gender of literary characters from the author’s differing word use between characters of different genders. Here we describe results showing how Shakespeare used language differently for his male and female characters, and we have studied the top discriminating features from characters of both genders. We used Sequential Minimal Optimization (SMO) to classify of gender character, based on various lexical and syntactic features to analyze the language Shakespeare used for gendering characters. Our methods achieve classification accuracy as high as 82 % for classifying character gender. We further observe several interesting patterns in the most distinguishing features, including the fact that some constellations of features match well to previous reports of features that distinguish between male and female authors.
Bimbingan Kelompok dengan Teknik Problem Solving dalam Meningkatkan Penyesuain Diri di Lingkungan Baru
No full textIn addition to using policies from the government, there are also policies from the administrators of the pesantren, known as students who study in Islamic boarding schools. Many problems occur to students, especially new students who cannot adjust to their new environment. They will, have difficulties in social and learning. Group guidance services use problem-solving techniques expected to help students solve problems that occur, so that students are accustomed to solving their own problems. The author uses a pre-research method that collects various main informatprimaryabout hidden themes by using various sources. What needs to be observed is how the scheme works on the object, the environmental conditions, and also what problems are going on in the object; after the observation, the researcher interviewed the auto to know how the thing was. The aim was to find what obstapurposes and kinds of obstacles were, hota were who were threats involved,and how the concepts and methods were wanted t develop further
Stylistic text classification using functional lexical features
No full textMost text analysis and retrieval work to date has focused on determining the topic of a text, what it is about. However, a text also contains much useful information in its style, or how it is written. This includes information about its author, its purpose, feelings it is meant to evoke, and more. This paper addresses the problem of classifying texts by style (along several different dimensions), developing a new type of lexical feature based on taxonomies of various semantic functions of different lexical items (words or phrases). We show the usefulness of such features for text classification by author, author personality, gender of literary characters, sentiment (positive/negative feeling), and scientific rhetorical styles. We further show how the use of such functional features aids in gaining insight about stylistic differences between texts. ∗ Casey Whitelaw was a visiting scholar at the IIT Linguistic Cognition Laboratory during November 2004. 1
Prefiguring Alternative Organizing: Confronting marginalization through projective cultural adjustment and tempered autonomy
No full textIn this paper, we examine community collectives – place-based, community-led initiatives for sustainable livelihood, as an alternative to the top-down, efficiency-driven economic model. Drawing on the theoretical framework of prefigurative organizing, we examined the strategies employed by community members in confronting entrenched inequalities and overcoming marginalization as they envision and engage in inclusive futures. We conducted a comparative case study of two exemplary community collectives in India that exhibited differences in the degrees of internal and external marginalization. We identified two key cross-cutting themes of prefigurative organizing: projective cultural adjustment – whether a community leverages their traditional culture or breaks away from it, and tempered autonomy – negotiating autonomy without overtly challenging dominant groups, and exercising self-imposed restraints to make independent decisions. We show how these two themes manifested across three key processes of prefigurative organizing: prefiguring self-governance; commoning; and cultivating discursive spaces. These findings help us theorize that in communities where the degree of internal marginalization is high due to persisting social hierarchies, breaking away from past discriminatory practices, incorporating suspension of consent in the decision-making process, and introducing multiple constructive works are essential components of prefigurative organizing. In communities where the degree of external marginalization is high, building on the past, incorporating refusal in decision-making, and introducing unified constructive work are important components of prefigurative organizing. We suggest that prefigurative organizing against the dominant power structure, whether within community social hierarchies or external exploitative political-economic structures, is based on selective and strategic engagement without seeking an exit, as exit might not be an option for place-based communities. We discuss the theoretical and practical implications of this research for alternative organizing and grand challenges.The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This research was supported by IDRC Doctoral Research Award (# 107473-99906075- 074 to Babita Bhatt) and the Research Grants Council of Hong Kong (GRF Grants: PolyU 548210 to Israr Qureshi and PolyU 549211 to Babita Bhatt and Israr Qureshi)
Evaluation of Minimally Invasive Surgical Therapies for Ulcerative Colitis.
No full text© The Author(s) 2020 Introduction: Ulcerative colitis (UC) is a chronic inflammatory intestinal disorder that can be managed surgically with a proctocolectomy. Minimally invasive techniques such as laparoscopic or robotic-assisted surgery are available based on the surgeon’s preference and familiarity. To date, there is a paucity of literature evaluating the safety of these techniques in comparison to the open approach in patients with UC. Methods: We surveyed the National Surgical Quality Improvement Program (NSQIP) database to select patients with the diagnosis of UC who underwent either robotic, laparoscopic, or open proctocolectomy between 2012 and 2017. A total of 2129 patients were included in the study. The 30-day postoperative outcomes were compared using multivariable logistic regression models after adjusting for confounding variables. The confounding variables were defined as any preoperative variable that was associated with the type of procedure. Results: The 30-day postoperative outcomes reported in the NSQIP database were reviewed for each of the treatment groups (open, laparoscopic, and robotic). The anastomotic leak rate was significantly higher in the open group (P = .022). The robotic and laparoscopic groups had significantly fewer occurrences of postoperative ileus (P = .0006) and wound infections (P \u3c .0001). There were significantly more strokes, cardiac events, and pulmonary events in the open surgical group. Operative time was significantly shorter in the open group (P \u3c .0001). Reintervention rates were not significantly different among the groups. Conclusions: Minimally invasive proctocolectomy has significantly fewer postoperative complications compared with open proctocolectomy for UC. There is no significant difference in the postoperative outcomes between robotic-assisted and laparoscopic proctocolectomy
Yash Chopra
No full textAs a charismatic director in the Indian film industry, Chopra’s name is synonymous with the glamour of the romantic film and a certain style within Indian culture. Spanning four decades, his directed features include some of the classic films of Indian film history, such as Deewaar and Kabhi Kabhie. His directorial career began in 1959 with Dhool Ka Phool and he has been a major producer since 1973, consolidating his success in the 1990s with a series of huge box office hits including Dilwale Dulhaniya Le Jayenge. He has also worked in other Hindi movie genres, directing action movies such as Mashaal and a thriller, Darr. This book discusses in depth his work with the Hindi megastar Amitabh Bachanan in films such as Deewaar, Trishul, Kala Patthar and Silsila and how, in his transformation of the look of mainstream cinema in Dil To Pagal Hai and other films, Yash Chopra has proved to be a tireless innovator within a mainstream tradition. The author integrates this analysis with information about the man and his work, based on interviews with Yash Chopra, his family, his colleagues, his stars, his contemporaries and major critics that include views from Amitabh Bachchan, Shahrukh Khan, Shashi Kapoor and Sri Devi. A study of a top contemporary Indian film director, Rachel Dwyer’s book also examines the influence on Chopra of predecessors such as Raj Kapoor and how his own legacy can be seen in such films as Kuch Kuch Hota Hai and younger directors such as Karan Johar and Aditya Chopra
