New Generation
Recently Published Documents





2021 ◽  
pp. 1-31
Lorenzo Pinelli ◽  
Andrea Amedei ◽  
Enrico Meli ◽  
Federico Vanti ◽  
Benedetta Romani ◽  

Abstract The need for high performances is pushing the complexity of mechanical design at very high levels, especially for turbomachinery components. Structural topology optimization methods together with additive manufacturing techniques for high resistant alloys are considered very promising tools, but their potentialities have not been deeply investigated yet for critical rotating components like new-generation turbine blades. This research work proposes a methodology for the design, the optimization and the additive manufacturing of extremely stressed turbomachinery components like turbine blade-rows. The presented procedure pays particular attention to important aspects of the problems as fluid-structure interactions and fatigue of materials, going beyond the standard structural optimization approaches found in the literature. The numerical procedure shows robustness and efficiency, making the proposed methodology a good tool for rapid design and prototyping, and for reducing the design costs and the time-to-market typical of these mechanical elements. The procedure has been applied to a low-pressure turbine rotor to improve the aeromechanical behavior while keeping the aerodynamic performance. From the original geometry, mode-shapes, forcing functions and aerodynamic damping have been numerically evaluated and are used as input data for the following topological optimization. Finally, the optimized geometry has been verified in order to confirm the improved aeromechanical design. After the structural topology optimization, the final geometries provided by the procedure have been then properly rendered to make them suitable for additive manufacturing. Some prototypes of the new optimized turbine blade have been manufactured to be tested in terms of fatigue.

2021 ◽  
Alexandra Hughes-Johnson

Women’s suffrage was the most significant challenge to the constitution since 1832, seeking not only to settle demands for inclusion and justice but to expand and redefine definitions of citizenship. From 1832 to the present day, from the countryside in Wales to the Comintern in Moscow, from America to Finland and Ireland to Australia, from the girls’ school to the stage, we examine how women sought to work within, and remake, political systems and structures. Bringing together early career and established scholars, this collection represents some of the most exciting work emerging from the 2018 centenary of women’s suffrage in Britain, building on the significant feminist scholarship on suffrage and reshaping the conversation for a new generation.

2021 ◽  
Vol 13 (1) ◽  
pp. 172-186
Benjamin Chukwunoso Nwokocha

This paper x-rayed in a very precise form the theology of miracle healing and prosperity message expounded by the preachers of the new generation churches in Nigeria. Since however, this title is a bit too vast and ambitious for the limited scope and time of the discourse, the paper, therefore, investigated the salient issues involved in the theology of miracle healing and prosperity message as expounded by the preachers of the new generation churches in the south-east of Nigeria; though south-east/Igboland and Nigeria are used interchangeably. It also investigated how the theology amongst other factors has occasioned the proliferations of new religious movements in Nigeria. Other issues that are connected to the growth of the new religious movements in Nigeria and Igboland in particular examined in this study included the African’s quest for power, cultural identity, ethnic identity, health, and economic emancipation. The purpose of this study is to x-ray the impact of prosperity preaching and quest for miracle in the new religious movements in Nigeria. The findings showed that the import of the new religious movements in Nigeria is occasioned by the excesses of the colonial and missionary overlords in the pre-colonial Nigeria. Findings also indicated that the new religious movements came to fore in Nigeria as a religion of the oppressed in the cultural, social, religious and political spheres. It was developed as a rescue mission to the already degraded religion and tradition of the people. The methods of approach include historical and phenomenological methods. The study however recommends the theology of prosperity and miracle healing as a correct and sound teaching for not just the new religious movements but for all Christian churches in Nigeria. The study equally advocates that it would not be expounded beyond proportion so that the church would not be reduced to a mere miracle centers.

M. Bouvier ◽  
A. López-Sepulcre ◽  
C. Ceccarelli ◽  
N. Sakai ◽  
S. Yamamoto ◽  

V. A. Kolobaev ◽  
S. V. Rykov ◽  
I. V. Kudryavtseva ◽  
E. E. Ustyuzhanin ◽  
P. V. Popov ◽  

2021 ◽  
pp. 001041402110242
Sidney Tarrow

Descriptive or ethnographic studies were once the stock-in-trade of the comparative politics of non-Western areas and illiberal states. The last few decades have seen a dramatic growth in quantitative—or at least systematic—studies of these systems. This marks real progress, but, in the process, some of the advantages of ethnographic and “unit-contextual” studies have been lost. The contributors to this symposium have used ethnographic methods—often in combination with other methods—to examine and compare episodes of contentious politics in a number of these countries. Drawing on some of the “classics” of comparative politics, this article emphasizes both the continuities and the departures of the new generation of “ethnography plus” research efforts represented in this symposium.

2021 ◽  
Vol 10 (14) ◽  
pp. 3102
Alexander R. Tamm ◽  
Martin Geyer ◽  
Felix Kreidel ◽  
Lea Dausmann ◽  
Caroline Jablonski ◽  

The aim of this study was to compare patients with transcatheter aortic valve replacement (TAVR) receiving new generation prostheses SAPIEN 3 (S3, Edwards Lifesc.) and Evolut R (ER, Medtronic Inc.) in terms of periprocedural and long-term outcome. Our retrospective, single-center analysis included 359 consecutive patients with severe aortic stenosis who underwent TAVR with S3 or ER from 2014–2016 (mean age 82 ± 7 years, 47% male, mean EuroSCORE II 8.0 ± 8%, mean follow-up 3.8 years). Device Success was equal (S3 93.0% vs. ER 92.4%, p = 0.812). We report a 30-day mortality of 2.8% in the S3 group, and 2.1% in the ER group (p = 0.674). There was no difference in stroke, conversion to open surgery, vascular and bleeding complications or myocardial infarction. While prosthesis mean gradients were higher with S3 (12.0 mmHg vs. 8.2 mmHg, p < 0.001), there was a trend to less paravalvular regurgitation (PVR moderate or severe: 1% vs. 3.6%, p = 0.088). All-cause mortality up to 5 years did not show a difference (mean survival S3 3.5 ± 0.24 years, ER 3.3 ± 0.29 years, p = 0.895). Independent predictors of long-term mortality were impaired LVEF, chronic kidney injury, peripheral artery disease, malignant tumor and periprocedural stroke. New generation TAVR valves offer an excellent implant and outcome success rate. Long-term survival was independent of prostheses choice and mainly attributed to comorbidities and complications.

Export Citation Format

Share Document