On the Reduction of the Pre-Processing Effort and the Application of a Contact Meshing Approach for Complex Jet Engine Component Assemblies

2014 ◽  
Author(s):  
W. Hufenbach ◽  
A. Hornig ◽  
H. Böhm ◽  
A. Langkamp ◽  
A. Keskin
Keyword(s):  
Significant Proportion ◽  
Work Effort ◽  
Positive Effects ◽  
Tetrahedral Elements ◽  
Automated Method ◽  
Geometry Decomposition ◽  
Hexahedral Meshes ◽  
Complex Structural ◽  
Processing Effort ◽  
Pressure Compressor

A significant proportion of the work effort for finite element (FE) analysis is spent for pre-processing activities, especially for complex structural components and component assemblies. An exclusive use of hexahedron (hex) elements increases the meshing effort substantially compared to tetrahedral elements. An automated method to generate high quality hexahedral meshes for an arbitrary geometry does not exist. In this work, commercially available FE software tools for meshing were investigated with the focus on an advantageous pre-processing effort. The evaluation showed that the software package NX (Siemens PLM Software) offers robust advanced semiautomatic hex meshing capabilities. Furthermore, a Contact Meshing Approach (CMA) was elaborated to reduce the effort of the challenging and time-consuming geometry decomposition significantly. Using the example of an intermediate pressure compressor it can be shown that the pre-processing effort time can be reduced up to 75%. Due to the independent meshes, element transitions in the geometry become redundant. This results in lower total element numbers and higher mesh qualities and subsequently leads to more efficient calculations. Moreover, the increased element quality has positive effects on the result quality.

On the Development of Strategies for an Efficient Semi-Automated Hex-Meshing Process of Complex Jet Engine Component Assemblies

2015 ◽  
Author(s):  
H. Böhm ◽  
A. Hornig ◽  
A. Langkamp ◽  
M. Gude ◽  
A. Keskin
Keyword(s):  
Significant Proportion ◽  
Work Effort ◽  
Hexahedral Mesh ◽  
Geometry Model ◽  
Design Changes ◽  
Hexahedral Meshing ◽  
Hexahedral Meshes ◽  
Complex Structural ◽  
Meshing Process

A significant proportion of the work effort for a whole engine analysis is spent for prep-processing tasks especially for component assemblies and complex structural components. With respect to the generation of a pure hexahedral mesh, the work effort increases due to the absence of an automatic method to generate high quality hexahedral meshes for an arbitrary geometry. In addition, the time-consuming hexahedral meshing process contains numerous, repetitive tasks for large and complex assemblies due to similar and identical components. In this work a modular strategy for hexahedral meshing of large and complex assemblies was explored with the aim to reduce and to simplify the development process due to a prospective semi-automation of time-consuming routines. The procedure bases on an initial identification and classification of each component of the whole assembly regarding e.g. overall meshing complexity. Meshing relevant parameters were identified for geometry preparation and hexahedral meshing itself. Furthermore, for semi-automation the software package NX (Siemens NX Software), in particular the incorporated automation tool Product Template Studio (PTS) was investigated which enables an automated re-meshing of the geometry model in case of design changes.

Staying the distance: Transforming Latin pedagogy at the Open University

2019 ◽  
Vol 18 (1-2) ◽  
pp. 101-128
Author(s):  
Mair E. Lloyd ◽  
James Robson
Keyword(s):  
Cultural Context ◽  
Learning Experience ◽  
New Technology ◽  
Significant Proportion ◽  
Lessons Learned ◽  
Future Research ◽  
Open University ◽  
Ancient Rome ◽  
Positive Effects ◽  
Pedagogical Changes

Abstract Between 2000 and 2013, over 8,000 students studied the module Reading Classical Latin at the Open University, the United Kingdom’s largest distance education provider. But while many learners attained high grades, a significant proportion withdrew from study or failed the module. In 2015, the original module was replaced with a completely new course, Classical Latin: The Language of Ancient Rome. This article details the innovative ways in which new technology and pedagogical theory from Modern Foreign Language (MFL) learning were drawn on by the team designing this new module, resulting in a learning experience which gives greater emphasis to elements such as spoken Latin, the intrinsic pleasure of reading, and cultural context. The (largely positive) effects of these pedagogical changes on student success and satisfaction are subsequently analysed using a rich mix of qualitative and quantitative data. Finally, the authors reflect on lessons learned and the possibilities for future research and enhancement.

scholarly journals The effects of health tourism investments in tourism businesses in the Northern Hungarian Region

2016 ◽  
Vol 10 (4-5) ◽  
pp. 45-50
Author(s):  
Róbert Szabó
Keyword(s):  
Significant Proportion ◽  
Business Leaders ◽  
Small Enterprises ◽  
Development Programs ◽  
Health Tourism ◽  
Positive Effects ◽  
Professional Management ◽  
Contingency Coefficient ◽  
Marketing Activities ◽  
Correlation Tests

In my article I woud like to find answers for the question how frequently and effectively the region’s business leaders in Northern Hungary participated in various development programs, as regards investments in health tourism, what developments have been made mainly in the area, what the positive effects of these developments were in the life of businesses, whether the businesses (leaders) feel successful, and how their success was manifested. I carried out a questionnaire survey among enterprises. From the data I calculated mean, SD and spectrum and examined the crosstab correlations as well, and the Cramer’s V associate coefficient and Contingency coefficient. The results of the correlation tests could be summarised as the following: According to the survey, the number of the medium-sized enterprises being involved utilised a significant proportion of their development funds, compared to the micro and small enterprises. Although the idea of spas winterizing their pools was not considered an important development, both the adventure and wellness elements were important for the construction of thermal baths. In the case of hotels, the expansion of wellness elements and other additional services together with the development of marketing activities played an important role. Besides the positive business publicity, enterprises see the positive effects of the investment in the increase of their income; the success can be the result of the adequate supply of components, the professional management and that of positive image.

scholarly journals APPLICATION OF DISCONTINUOUS GALERKIN SPECTRAL METHOD ON HEXAHEDRAL ELEMENTS FOR AEROACOUSTIC

2009 ◽  
Vol 17 (02) ◽  
pp. 175-196 ◽  
Author(s):  
N. CASTEL ◽  
G. COHEN ◽  
M. DURUFLÉ
Keyword(s):  
Discontinuous Galerkin ◽  
Hyperbolic Systems ◽  
High Order ◽  
Computational Time ◽  
Quadrature Formulas ◽  
Linearized Euler Equations ◽  
Tetrahedral Elements ◽  
Hexahedral Elements ◽  
Hexahedral Meshes ◽  
Matrix Vector

A discontinuous Galerkin method is developed for linear hyperbolic systems on general hexahedral meshes. The use of hexahedral elements and tensorized quadrature formulas to evaluate the integrals leads to an efficient matrix–vector product. It is shown that for high order approximations, the reduction in computational time can be very important, compared to tetrahedral elements. Two choices of quadrature points are considered, the Gauss points or Gauss–Lobatto points. The method is applied to the aeroacoustic system ("simplified" Linearized Euler Equations). Some 3D numerical experiments show the importance of penalization, and the advantage of using high order.

scholarly journals Effects of Marine Proteced Areas on the invasive success of six macroalgae species

2018 ◽  
Author(s):  
Andreu Blanco Cartagena ◽  
Jesús Sousa Troncoso ◽  
Celia Olabarria ◽  
Marco Filipe Loureiro Lemos
Keyword(s):  
Significant Proportion ◽  
Wave Exposure ◽  
Ecosystem Functions ◽  
Marine Biodiversity ◽  
Grateloupia Turuturu ◽  
Positive Effects ◽  
Marine Invasions ◽  
Marine Invasive Species ◽  
Management Policies ◽  
Negative Impacts

Negative impacts of marine invasions include loss of genetic diversity, ecosystem functions/processes, and/or community structure and, consequently, a threat to global biodiversity through biotic homogenization. Recent studies indicate that invasive macroalgae make up a significant proportion of marine invasive species. Marine Protected Areas (MPAs) have been proved to have positive effects on marine biodiversity conservation; however, their role in preventing biological invasions, especially macroalgae, is still poorly understood. In this context, we studied the effects of protection and wave exposure on the abundance of six invasive macroalgae (Grateloupia turuturu, Asparagopsis armata, Colpomenia peregrina, Sargassum muticum, Undaria pinnatifida, and Codium fragile ssp. fragile) at two MPAs of the western Iberian Peninsula, one located along the Spanish coast (Illas Atlánticas) and the other on the Portuguese coast (Berlangas). The results showed opposite effects of protection and wave-exposure at the two MPAs. Greater biomass of invasive macroalgae was found at semiexposed areas outside the reserve in the Spanish MPA, whereas in the Portuguese reserve, biomass (especially of A. armata) was significantly greater inside the reserve, mainly at semiexposed sites. These differences highlight the importance of understanding the functioning of reserves to apply proper conservation management policies in order to preserve the MPAs resilience.

Bullying in School and Cyberspace

2021 ◽  
Author(s):  
Jane Timmons-Mitchell ◽  
Ivette Noriega ◽  
Daniel J. Flannery
Keyword(s):  
United States ◽  
Suicide Attempts ◽  
Longitudinal Research ◽  
Significant Proportion ◽  
The United States ◽  
Federal Regulations ◽  
Traditional Bullying ◽  
Prevention And Intervention ◽  
Positive Effects ◽  
Bullying Behavior

For students, bullying is a significant problem, especially in middle school: up to half of students are involved, either as a bully, a victim, or a bystander. The effects of bullying range from negligible to very severe, including individual psychological difficulties as well as consequences for criminogenic behavior. Theories to explain multidetermined bullying behavior include ecological as well as family-based approaches. Bullying must contain the following elements: unwanted aggressive behavior(s) by another youth or groups of youths who are not siblings or current dating partners that involves an observed or perceived power imbalance and is repeated multiple times or is highly likely to be repeated. This definition describes traditional bullying, in which a person or persons can be seen to be engaged in bullying behavior. Since the late 1990s, cyberbullying has been on the rise. Traditional bullying and cyberbullying differ in the following ways: (a) cyberbullying often means the victim does not know who the bully is; (b) cyberbullying is not a discreet incident; it can be preserved in cyberspace indefinitely; (c) anger rumination, anxiety, depression, and suicidality are more prevalent among cyberbully victims; (d) cyberbullies can exhibit decreased empathy for others relative to traditional bullies; and (e) longitudinal research has found some support that cyberbullies may develop delinquent behaviors in adulthood. Bullying affects a significant proportion of students, between 18% and 31% of students in the United States are likely to be involved in traditional bullying, whereas rates of cyberbullying involvement are close to 59%. Any participation in bullying can affect youth negatively. Being either a bully or a victim can lead to depression, self-harm, suicidal ideation, and suicide attempts. Being a perpetrator of bullying and cyberbullying may also increase the likelihood of criminal activity in young adulthood. According to the path analytic model of juvenile delinquency, it is likely that association with delinquent peers and parenting style are related to bullying behavior. Prevention and intervention programs have had some positive effects. Prevention and intervention efforts should concentrate on universal dissemination of effective strategies, including that cyberbullies are not really anonymous. Family and school-based interventions can strengthen adult support while encouraging programs that teach children to respect each other, promoting prosocial development. For traditional bullying, school climate programs in primary school have shown positive effects. Interventions for traditional bullying that are based in family therapy have shown success. Due to the novelty of cyberbullying, few intervention studies are available as yet. Efforts to prevent cyberbullying include setting up anonymous tiplines in schools and sharing up-to-date technological advances with parents so that they can implement those blocks that are available. Finally, there are no specific federal laws in the United States addressing bullying; however, federal regulations do exist to provide frameworks for anti-discrimination laws pertaining to protected classes. Although there are no explicit federal regulations that address bullying, state and local policies have been key components in addressing bullying issues. There has been some evidence that suggest that anti-bullying laws and policies in schools may decrease bullying perpetration. Countries including New Zealand, Australia, and Sweden have passed specific laws to address bullying, while some countries apply laws created to address other infractions to include bullying.

scholarly journals The effect of protection and wave-exposure of two marine protected areas have opposite trends on macroalgae invasiveness.

2018 ◽  
Author(s):  
Andreu Blanco Cartagena ◽  
Jesús Souza Troncoso ◽  
Celia Olabarria ◽  
Marco Filipe Loureiro Lemos
Keyword(s):  
Protected Areas ◽  
Marine Protected Areas ◽  
Significant Proportion ◽  
Wave Exposure ◽  
Ecosystem Functions ◽  
Marine Biodiversity ◽  
Grateloupia Turuturu ◽  
Positive Effects ◽  
Marine Invasions ◽  
Marine Invasive Species

Negative impacts of marine invasions include loss of genetic diversity, ecosystem functions/processes, and/or community structure and, consequently, a threat to global biodiversity through biotic homogenization. Recent studies indicate that invasive macroalgae make up a significant proportion of marine invasive species. Marine Protected Areas (MPAs) have been proved to have positive effects on marine biodiversity conservation; however, their role in preventing biological invasions, especially macroalgae, is still poorly understood. In this context, we studied the effects of protection and wave exposure on the abundance of six invasive macroalgae (Grateloupia turuturu, Asparagopsis armata, Colpomenia peregrina, Sargassum muticum, Undaria pinnatifida, and Codium fragile ssp. fragile) at two MPAs of the western Iberian Peninsula, one located along the Spanish coast (Illas Atlánticas) and the other on the Portuguese coast (Berlangas). The results showed opposite effects of protection and wave-exposure at the two MPAs. Greater biomass of invasive macroalgae was found at semiexposed areas outside the reserve in the Spanish MPA, whereas in the Portuguese reserve, biomass (especially of A. armata) was significantly greater inside the reserve, mainly at semiexposed sites. These differences highlight the importance of understanding the functioning of reserves to apply proper conservation management policies in order to preserve the MPAs resilience.

scholarly journals The use of cannabinoid and non-cannabinoid supplementary therapies in patients undergoing treatment for Glioblastoma reveals an urgent need for guidance

2021 ◽  
Vol 23 (Supplement_4) ◽  
pp. iv10-iv11
Author(s):  
Babar Vaqas ◽  
Louise Dulley ◽  
Ruchi Maniar
Keyword(s):  
Cannabinoid Receptor ◽  
Significant Proportion ◽  
Unmet Need ◽  
Alternative Therapies ◽  
Patient Questionnaire ◽  
Positive Effects ◽  
Pathway Activation ◽  
Number Of Patients ◽  
Nice Guidance ◽  
Small Cohort

Abstract Aims Glioblastoma (GBM) is currently an incurable malignancy with a very poor prognosis for the majority of patients. Many patients undergo debulking surgery, radiotherapy and chemotherapy however therapeutic options are limited, and this can lead to patients sourcing their own treatments. There is some evidence that cannabinoids have the effect of inhibiting GBM tumour growth through a variety of pathways, some of which include CB2 cannabinoid receptor pathway activation. We undertook a patient questionnaire to understand what alternative therapies patients are accessing and why, with a focus on cannabinoid use. Method We undertook a prospective observational questionnaire based qualitative study of 50 … consecutive patients undergoing treatment for glioblastoma at our centre. Results 43 patients responded to our questionnaire. 33% of patients were taking some kind of supplementary therapy with 25% taking cannabis derivatives, mainly CBD oil. There were no clear discriminators amongst our cohort including age or sex when considering the likelihood of taking cannabis derivatives. 6 out of 11 (55%) patients taking cannabis derivatives reported some positive effects with improved sleep and general wellbeing being most commonly reported. Patients reported spending between £10-£300 per month with an average of £42 per month. Cannabis products were obtained via the internet or from friends. Conclusion This small cohort of patients indicates that a significant proportion of glioblastoma patients investigate and use alternative therapies, in particular cannabis oil. NICE guidance for clinicians simply notes there is insufficient evidence to support the use of cannabis oil in the treatment of this disease. Given the publicity and interest in the utility of cannabis oil to treat cancers this leaves patients to research the use of these agents without access to robust clinical data to guide their use or indeed to conclude they are not beneficial. The accessing of these compounds, potentially by a sizeable number of patients, leaves them vulnerable to unregulated perhaps unscrupulous drug sources. This small study has further highlighted the unmet need for information and guidance on supplementary treatments for glioma patients and this poses a challenge to all those treating this group of patients to answer a question our patients are clearly wanting answered.

scholarly journals Seasonal Use of Railways by Wildlife

Diversity ◽  
2018 ◽  
Vol 10 (4) ◽  
pp. 104 ◽  
Author(s):  
Jesse Popp ◽  
Josef Hamr
Keyword(s):  
Road Ecology ◽  
Significant Proportion ◽  
Basic Research ◽  
Mammalian Fauna ◽  
Positive Effects ◽  
Wildlife Species ◽  
Patterns Of Use ◽  
Frequency Of Use ◽  
Baseline Information ◽  
Species Specific

Despite the rapid advancements in the field of road ecology, very little research has been done in railway ecology. Basic research, such as railway use by wildlife, is relatively undocumented, albeit very important in understanding the potential negative and positive effects of railways on wildlife and ecosystems. We provide one of the first studies documenting wildlife railway use using motion-triggered cameras along a 20 km stretch of railway in Ontario. Our objectives were to develop a much-needed baseline understanding of railway use by endemic wildlife species, investigate differences in frequency of use among species, compare diurnal versus nocturnal use, and determine if railway use by wildlife was uniform or spatially varied. We found a significant proportion of medium-to-large resident mammalian fauna and several avian species non-uniformly using the studied railway. Some species used the railway as a travel corridor, while others appeared to use it incidentally. Diel and seasonal patterns of use were apparent for many species. Our findings emphasize the importance of species-specific investigations of railway ecology. The collection of baseline information on railway use by wildlife is critical in view of the dearth of available data, and we highly encourage further research in all aspects of wildlife–railway ecology.

scholarly journals The effect of protection and wave-exposure of two marine protected areas have opposite trends on macroalgae invasiveness.

2018 ◽  
Author(s):  
Andreu Blanco Cartagena ◽  
Jesús Souza Troncoso ◽  
Celia Olabarria ◽  
Marco Filipe Loureiro Lemos
Keyword(s):  
Protected Areas ◽  
Marine Protected Areas ◽  
Significant Proportion ◽  
Wave Exposure ◽  
Ecosystem Functions ◽  
Marine Biodiversity ◽  
Grateloupia Turuturu ◽  
Positive Effects ◽  
Marine Invasions ◽  
Marine Invasive Species

Negative impacts of marine invasions include loss of genetic diversity, ecosystem functions/processes, and/or community structure and, consequently, a threat to global biodiversity through biotic homogenization. Recent studies indicate that invasive macroalgae make up a significant proportion of marine invasive species. Marine Protected Areas (MPAs) have been proved to have positive effects on marine biodiversity conservation; however, their role in preventing biological invasions, especially macroalgae, is still poorly understood. In this context, we studied the effects of protection and wave exposure on the abundance of six invasive macroalgae (Grateloupia turuturu, Asparagopsis armata, Colpomenia peregrina, Sargassum muticum, Undaria pinnatifida, and Codium fragile ssp. fragile) at two MPAs of the western Iberian Peninsula, one located along the Spanish coast (Illas Atlánticas) and the other on the Portuguese coast (Berlangas). The results showed opposite effects of protection and wave-exposure at the two MPAs. Greater biomass of invasive macroalgae was found at semiexposed areas outside the reserve in the Spanish MPA, whereas in the Portuguese reserve, biomass (especially of A. armata) was significantly greater inside the reserve, mainly at semiexposed sites. These differences highlight the importance of understanding the functioning of reserves to apply proper conservation management policies in order to preserve the MPAs resilience.

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