Two-to-one resonant multi-modal dynamics of horizontal/inclined cables. Part I : theoretical formulation and model validation

This paper is first of the two papers dealingwith analytical investigation of resonant multimodal dynamics due to 2:1 internal resonances in the finite-amplitude free vibrations of horizontal/inclined cables. Part I deals with theoretical formulation and validation of the general cable model. Approximate nonlinear partial differential equations of 3-D coupled motion of small sagged cables - which account for both spatio-temporal variation of nonlinear dynamic tension and system asymmetry due to inclined sagged configurations - are presented. A multidimensional Galerkin expansion of the solution ofnonplanar/planar motion is performed, yielding a complete set of system quadratic/cubic coefficients. With the aim of parametrically studying the behavior of horizontal/inclined cables in Part II [25], a second-order asymptotic analysis under planar 2:1 resonance is accomplished by the method of multiple scales. On accounting for higher-order effectsof quadratic/cubic nonlinearities, approximate closed form solutions of nonlinear amplitudes, frequencies and dynamic configurations of resonant nonlinear normal modes reveal the dependence of cable response on resonant/nonresonant modal contributions. Depending on simplifying kinematic modeling and assigned system parameters, approximate horizontal/inclined cable models are thoroughly validated by numerically evaluating statics and non-planar/planar linear/non-linear dynamics against those of the exact model. Moreover, the modal coupling role and contribution of system longitudinal dynamics are discussed for horizontal cables, showing some meaningful effects due to kinematic condensation

Pattern and degree of left ventricular remodeling following a tailored surgical approach for hypertrophic obstructive cardiomyopathy.

Background The role of a tailored surgical approach for hypertrophic cardiomyopathy (HCM) on regional ventricular remodelling remains unknown. The aims of this study were to evaluate the pattern, extent and functional impact of regional ventricular remodelling after a tailored surgical approach. Methods From 2005 to 2008, 44 patients with obstructive HCM underwent tailored surgical intervention. Of those, 14 were ineligible for cardiac magnetic resonance (CMR) studies. From the remainder, 14 unselected patients (42±12 years) underwent pre- and post-operative CMR studies at a median 12 months post-operatively (range 4-37 months). Regional changes in left ventricular (LV) thickness as well as global LV function following surgery were assessed using CMR Tools (London, UK). Results Pre-operative mean echocardiographic septal thickness was 21±4 mm and mean LV outflow gradient was 69±32 mmHg. Following surgery, there was a significant degree of regional regression of LV thickness in all segments of the LV, ranging from 16% in the antero-lateral midventricular segment to 41% in the anterior basal segment. Wall thickening was significantly increased in basal segments but showed no significant change in the midventricular or apical segments. Globally, mean indexed LV mass decreased significantly after surgery (120±29g/m2 versus 154±36g/m2; p<0.001). There was a trend for increased indexed LV end-diastolic volume (70±13 mL versus 65±11 mL; p=0.16) with a normalization of LV ejection fraction (68±7% versus 75±9%; p<0.01). Conclusion Following a tailored surgical relief of outflow obstruction for HCM, there is a marked regional reverse LV remodelling. These changes could have a significant impact on overall ventricular dynamics and function

Penggunaan Air Kelapa untuk Setek Batang Jati (Tectona Grandis)

Teak plant wasa treewhich timber has durability classI and strong class I. It hasmany benefits, from roots to leaves. Variousbenefits of teak causing to do cultivation, one of propagation activities that often carried out was vegetative. Vegetative propagation of plants can be done bystem cutting, root cutting and shoot cutting. Using of growth regulator with coconut water immersion is expected to spur the growth rootofteak stem cutting. This study aimed to determine the effect of using coconut water to increase the success of teak stem cuttinggrowth, andto determine the best dose of using coconut water forteak stem cutting growth. This treatment used Completely Randomized Design(CRD). This research consisted of five treatments that usedcoconut water treatment 0%, 25%, 50%, 75%, and 100%. Each treatmentconsisted of five teak stem cuttings with repetition as much as 5 times. Amount ofmaterial plants required 5 x 5 x 5 = 125 teak stem cuttings. The resultshowed by using coconut wateras a growth regulator could increasethe growth of teak (Tectona grandis) stem cuttingin 50%--100% concentration and the best dose of coconut water asa growth regulator was 100%

Separation of quadrupolar and magnetic contributions to spin-lattice relaxation in the case of a single isotope

We present a NMR pulse double-irradiation method which allows one to separate magnetic from quadrupolar contributions in the spin-lattice relaxation. The pulse sequence fully saturates one transition while another is observed. In the presence of a Delta m = 2 quadrupolar contribution, the intensity of the observed line is altered compared to a standard spin-echo experiment. We calculated analytically this intensity change for spins I=1, 3/2, 5/2, thus providing a quantitative analysis of the experimental results. Since the pulse sequence we used takes care of the absorbed radio-frequency power, no problems due to heating arise. The method is especially suited when only one NMR sensitive isotope is available. Different cross-checks were performed to prove the reliability of the obtained results. The applicability of this method is demonstrated by a study of the plane oxygen 17O (I = 5/2) in the high-temperature superconductor YBa_2Cu_4O_8: the 17O spin-lattice relaxation rate consists of magnetic as well as quadrupolar contributions.Comment: 7 pages, 6 figure

Activism, Art-ivism and Digital Media to Reduce Marginalisation: Sharing Experiences and Lessons from Brazil, Kenya, Syria, and Costa Rica

This guide is part of the AHRC e-Voices: Redressing Marginality International Network(http://evoices.cemp.ac.uk). The project ran in 2018 and 219 and brought together a global network of academics and practitioners to explore the theme of marginalisation and how digital media can be used to support marginalised groups to make their voices heard within and beyond the borders of their communities and promote social inclusion. During 2018 a range of events were held in the UK, Brazil, Kenya, Syria and Costa Rica to explore and share strategies and modalities implemented by activists and development organisations to fight marginalisation. This guide focuses on four emblematic case studies: (i) media activism in Brazil and how favela residents use digital media to foster community engagement and active citizenship; (ii) art-ivism, the use of art to serve activism causes, and how Kenyan artists use digital tools to promote a dialogue around human rights and power structures; (iii) digital media for social good and how development organisations working with displaced populations in Syria use digital technologies to foster peace and reconciliation in the country; and (iv) digital media for active citizenship and how the state of Costa Rica is working with arts and technologies to promote inclusion and well-being among the youth. This guide has four chapters, one per country, structured as follows: the context, two emblematic experiences in which media and arts are used to fight social inequalities, and a series of lessons learnt and challenges

Working With Marginalised Communities: Let’s talk about ethics

As researchers, members of NGOs, activists, and artists, we often work with marginalised communities. But how can we tell stories and work with people without putting them at risk

South-to-South dialogues between Brazilian and Kenyan artivists: decolonial and intersectional feminist perspectives

In this article, we analyze experiences in which Brazilian and Kenyan artivists (artists who are activists) used animation to challenge colonial hierarchies that devalue Global Southern knowledges, histories, and stories. We draw from ethnographic observations, in-depth interviews, and artivists’ experiences in two animation workshops: (a) Portrait of Marielle, produced with Kenyan artivists in Nairobi; (b) Homage to Wangarĩ Maathai, produced with Brazilian artivists in Salvador. We ask: how can artivist creative practices be used as tools for global movement building, contesting the colonial legacy of fragmented relationships between Global South peoples? We evoke decolonial and standpoint intersectional feminist perspectives to propose an understanding of artivism that considers the specificities of Global South contexts, connecting it to two axes: (a) establishing dialogical spaces and (b) mobilizing memories and histories. Our understanding of South-to-South artivist dialogues results from the ways in which notions of “pluriversality,” “incompleteness” and “humility,” which stem from Latin American and African scholarship are intertwined. When marginalized groups exchange “situated knowledges” and express themselves through artivism from “intersectional standpoints” or “lugares de fala,” this can have a binding nature, creating transformative connections between Global South peoples

South-to-South dialogues between Brazilian and Kenyan artivists: decolonial and intersectional feminist perspectives

In this article, we analyze experiences in which Brazilian and Kenyan artivists (artists who are activists) used animation to challenge colonial hierarchies that devalue Global Southern knowledges, histories, and stories. We draw from ethnographic observations, in-depth interviews, and artivists’ experiences in two animation workshops: (a) Portrait of Marielle, produced with Kenyan artivists in Nairobi; (b) Homage to Wangarĩ Maathai, produced with Brazilian artivists in Salvador. We ask: how can artivist creative practices be used as tools for global movement building, contesting the colonial legacy of fragmented relationships between Global South peoples? We evoke decolonial and standpoint intersectional feminist perspectives to propose an understanding of artivism that considers the specificities of Global South contexts, connecting it to two axes: (a) establishing dialogical spaces and (b) mobilizing memories and histories. Our understanding of South-to-South artivist dialogues results from the ways in which notions of “pluriversality,” “incompleteness” and “humility,” which stem from Latin American and African scholarship are intertwined. When marginalized groups exchange “situated knowledges” and express themselves through artivism from “intersectional standpoints” or “lugares de fala,” this can have a binding nature, creating transformative connections between Global South peoples

The representation of voluntourism in search engines: The case of South Africa

© 2015, © 2015 Government Technical Advisory Centre (GTAC). This paper responds to the paucity of research on the linkages between voluntourism and digital technology and seeks to understand the online representation of the phenomenon in a developing context. In particular, the researchers investigate the so-called ‘online domain’ of voluntourism in South Africa. The researchers collected a series of web results from search engines and analysed the presence of traditional and social media websites, the most relevant presented topics, and the type of argumentation found. Results identify the context and representation of voluntourism as it transpires virtually. This will contribute to the understanding of the interplay between voluntourism and digital technology, with specific emphasis on web presence. Ultimately, results will shed light on how digitally accessible voluntourism is in South Africa and will set the basis for future investigations