Rey Chin, Ramis Örlü, Jason Monty, Nicholas Hutchins, Andrew Ooi, Philipp Schlatter,
... simulation (LES) of a large-eddy break-up (LEBU) device in a spatially evolving turbulent boundary layer ... R e θ ≈ 4300. The implementation of the LEBU is via an immersed boundary method. The LEBU is positioned at a wall-normal distance of ... boundary layer thickness at the location of the LEBU) from the wall. The LEBU acts to delay the growth of the turbulent ... skin friction reduction beyond 180δ downstream of the LEBU, with a peak local skin friction reduction of ... when accounting for the device drag of the LEBU in accordance with the towing tank experiments by ...
Tópico(s): Wind and Air Flow Studies
2016 - Springer Science+Business Media | Flow Turbulence and Combustion
John F. Thompson, Andreas Pikis,
... this organism reveals three contiguous genes at loci: Lebu_1525 , Lebu_ 1526 and Lebu_ 1527. The translation products of these genes exhibit ... polypeptide comparable in size to that encoded by Lebu_1525 . The latter gene was cloned, and the ... super family. We suggest that the products of Lebu_1527 and Lebu_1525 , catalyze the phosphorylative translocation and hydrolysis of ...
Tópico(s): Gut microbiota and health
2011 - Wiley | Molecular Oral Microbiology
C.I. Chan, Ramis Örlü, Philipp Schlatter, Rey Chin,
... friction modification by a large-eddy breakup device (LEBU) in a zero-pressure-gradient turbulent boundary layer. The LEBU was modeled using an immersed boundary method. It ... of wake vortices, which propagate downstream from the LEBU and toward the wall. A skin friction decomposition ... region of velocity deficit formed downstream of the LEBU propagates toward the wall and leads to turbulence ... the Reynolds shear stress contribution reveals that the LEBU increases the Q2 and Q4 contributions and attenuates ...
Tópico(s): Fluid Dynamics and Vibration Analysis
2021 - American Institute of Physics | Physics of Fluids
Joon‐Seok Kim, Jinyul Hwang, Min Yoon, Junsun Ahn, Hyung Jin Sung,
... turbulent boundary layer with a large-eddy breakup (LEBU) device was performed to investigate the influence of the LEBU device on the near-wall turbulence and frictional drag. The LEBU device, which is thin and rectangular in shape, ... 80% of the boundary layer thickness (δ). The LEBU device reduced the skin-friction coefficient (Cf) up ... breakdown of the outer structures passing through the LEBU device reduced the energy of the long wavelength ...
Tópico(s): Wind and Air Flow Studies
2017 - American Institute of Physics | Physics of Fluids
Carolina Parada, François Colas, Samuel Soto-Mendoza, Leonardo R. Castro,
... central Chile (Constitución, Dichato, Gulf of Arauco and Lebu–Corral) to historical nursery areas (HRZ, region between ... of Arauco spawning areas), as well as identifying Lebu–Corral as a zone of high retention with ... associated pre-recruitment index (particles originated in the Lebu–Corral spawning zone). The highest pre-recruitment values ... showed strong offshore and alongshore velocity components. The Lebu–Corral region in winter presented important near-surface ... levels and a high pre-recruitment index for Lebu–Corral spawning zone. The limitations of the modeling ...
Tópico(s): Marine and coastal ecosystems
2011 - Elsevier BV | Progress In Oceanography
... produced by a large-eddy break-up device (LEBU) in turbulent flow over a flexible wall. The action of the LEBU is to reduce the skin friction over an extensive region downstream of the device. The LEBU consists of a two-dimensional airfoil in the ... unsteady pressures developed in the vicinity of the LEBU excite bending waves in the plate, and can ... by the interaction of the turbulence with the LEBU can in practice be several orders of magnitude ...
Tópico(s): Fluid Dynamics and Vibration Analysis
1989 - Royal Society | Proceedings of the Royal Society of London A Mathematical and Physical Sciences
Turbulent drag reduction downstream of large-eddy breakup (LEBU) devices is analyzed from the viewpoint of low- ... phenomena' associated with unsteady separation/transition of the LEBU device boundary layer. LEBU drag reduction is shown to be an extremely ... conclusion is drawn that the full potential for LEBU drag reduction must be explored at chord Reynolds ...
Tópico(s): Aerodynamics and Acoustics in Jet Flows
1986 - | SAE technical papers on CD-ROM/SAE technical paper series
Alexander Sahlin, P. Henrik Alfredsson, Arne V. Johansson,
... manipulators, the so-called Large Eddy Break Up (LEBU) devices, have been carried out in a towing ... momentum loss thickness of the boundary layer. The LEBU devices consisted of two hydrofoils arranged in tandem, ... a trip wire on the test plate. The LEBU foil section was 10% thick and symmetric. The ratio between the LEBU chord and δm ranged from 0.8 to ...
Tópico(s): Fluid Dynamics and Vibration Analysis
1986 - AIP Publishing | The Physics of Fluids
Charles Oluwaseun Adetunji, Samuel Adesayo Akande, Anuoluwapo Kemi Oladipo, Rukayat Adenike Salawu, Akudo Francilia Onyegbula,
... 6.21% (garri Ijebu from market A and lebu from market C) to 72.25% (fufu from ... to 93.79% (garri Ijebu market A and lebu from market C). Ash content ranged from 0.23% (Tapioca from market A) to 1.96% (lebu from market A), crude fibre content ranged between ...
Tópico(s): Food Safety and Hygiene
2017 - University of Ruhuna | Ruhuna Journal of Science
... large amplitude similar to a ship at sea. Lebu was extensively damaged. The shoreline at Lebu was elevated 1.5 meters, rendering docks and ... large expanse of new beach was exposed. Rio Lebu is no longer navigable because of the uplift. ...
Tópico(s): Botany and Geology in Latin America and Caribbean
1963 - Seismological Society of America | Bulletin of the Seismological Society of America
Liang Wang, Li Tang, Shouting Zhang, M. Santosh, Kai-Rui Song, Yuan‐Ming Sheng, Jia‐Ying Feng,
The recently discovered Baiyine'lebu Ag-Pb-Zn-F deposit in the southern Great Xing'an Range is hosted by NNE-trending transgressional fractures within ... the genesis and mineralization process of the Baiyine'lebu Ag-Pb-Zn-F deposit. Systematic trace element ... fluorite veins in the periphery of the Baiyine'lebu deposit could be genetically linked to the Ag- ...
Tópico(s): Geochemistry and Geologic Mapping
2021 - Elsevier BV | Ore Geology Reviews
Iván Vargas-Cordero, Umberta Tinivella, Lucía Villar-Muñoz, Joaquim P. Bento, Carolina Cárcamo, Diego López-Acevedo, Francisco Fernandoy, Alessandra Rivero, Marion San Juan,
... seabed morphology growth related to fluid migration offshore Lebu associated with mud cones by analysing oxygen and ...
Tópico(s): Hydrocarbon exploration and reservoir analysis
2020 - Nature Portfolio | Scientific Reports
... diversity of medium and large-sized mammals from Lebu Natural Protected Forest, Ethiopia. Surveys were conducted to ...
Tópico(s): Bat Biology and Ecology Studies
2019 - Wiley | Ecology and Evolution
В. И. Бородулин, Y. S. Kachanov,
... methods of turbulent-flow control (the so-called LEBU-device method) shows the great potential of the ... boundary layer produced by the presence of the LEBU-devices. No other experimental approach is able to ...
Tópico(s): Wind and Air Flow Studies
2013 - Elsevier BV | European Journal of Mechanics - B/Fluids
Samuel Soto-Mendoza, Carolina Parada, Leonardo R. Castro, François Colas, Wolfgang Schneider,
... strongest in the Gulf of Arauco and at Lebu–Corral. Mortality due to temperature and advective losses was more intense at higher latitudes (Lebu–Corral). Observed and simulated distributions of eggs and ...
Tópico(s): Coral and Marine Ecosystems Studies
2011 - Elsevier BV | Progress In Oceanography
Alexander Sahlin, Arne V. Johansson, P. Henrik Alfredsson,
... long towing tank, where large eddy breakup devices (LEBU’s) were used in single and tandem configurations ... any substantial net drag reduction by use of LEBU’s at high Reynolds numbers seem implausible.
Tópico(s): Particle Dynamics in Fluid Flows
1988 - AIP Publishing | The Physics of Fluids
Ponnampalam Balakumar, Sheila E. Widnall,
... turbulent flow by the large-eddy breakup devices (LEBU) were analyzed using linear three-dimensional unsteady aerodynamics. ... the ground plane decreases the effectiveness of the LEBU in reducing the amplitude of the vertical velocity ...
Tópico(s): Computational Fluid Dynamics and Aerodynamics
1986 - AIP Publishing | The Physics of Fluids
... two-dimensional elliptical vortex is convected past a LEBU, is solved analytically in the low-Mach-number ... by a turbulent boundary-layer flow over a LEBU. The introduction of a LEBU reduces the strength of the Lighthill quadrupole source ... dipole field decay rapidly with distance from a LEBU, and we find that an array of LEBU's could have a beneficial effect on the ...
Tópico(s): Wind and Air Flow Studies
1989 - Cambridge University Press | Journal of Fluid Mechanics
Paola Méndez, Christián Núñez, Jaime R. Cabrera‐Pardo, Cristian Paz, Juan Barraza, Rosario del P. Castillo, Carlos Peña‐Farfal,
... mantles (SM) at the Mine âMantos Negrosâ (Lebu, Chile). This coal was subjected to thermal oxidation ...
Tópico(s): Coal and Its By-products
2019 - Sociedad Chilena de Química | Journal of the Chilean Chemical Society
... during the 2013 main cropping season at Daro Lebu and Oda Bultum districts of West Hararghe Zone ... 25m 2 and 100m 2 plots at Daro Lebu and Oda Bultum districts, respectively. Economic data (cost ... scale up/out for Oda Bultum and Daro Lebu districts and others area which is similar agro- ...
Tópico(s): Potato Plant Research
2017 - Science Publishing Group | Computational Biology and Bioinformatics
Sarah Lebu, Rita Gyimah, Erick Nandoya, Joe Brown, Aaron Salzberg, Musa Manga,
Sanitation infrastructure can fail during heavy rainfall and flooding, allowing the release of fecal waste – and the pathogens it carries – into spaces where people live, work, and play. However, there is a scarcity of reliable frameworks that can effectively assess the resilience of such infrastructure to extreme rainfall and flooding events. The purpose of this study was to develop and apply a novel framework for assessing and ranking the resilience of sanitation infrastructure in informal settlements. ...
Tópico(s): Urban Stormwater Management Solutions
2024 - Elsevier BV | Journal of Environmental Management
Sarah Lebu, Allison Lee, Aaron Salzberg, Valerie Bauza,
Tópico(s): Water-Energy-Food Nexus Studies
2024 - Elsevier BV | The Science of The Total Environment
Sarah Lebu, Winnie Kibone, Chimdi Muoghalu, Stephen Ochaya, Aaron Salzberg, Felix Bongomin, Musa Manga,
Researchers have raised the possibility that soil-transmitted helminth (STH) infections might modify the host’s immune response against other systemic infections. STH infections can alter the immune response towards type 2 immunity that could then affect the likelihood and severity of other illnesses. However, the importance of co-infections is not completely understood, and the impact and direction of their effects vary considerably by infection. This review synthesizes evidence regarding the relevance ...
Tópico(s): Parasite Biology and Host Interactions
2023 - Public Library of Science | PLoS neglected tropical diseases
Chimdi Muoghalu, Prosper Achaw Owusu, Sarah Lebu, Anne Nakagiri, Swaib Semiyaga, Oliver Terna Iorhemen, Musa Manga,
Globally, about 2.7 billion people depend on onsite sanitation systems (OSS) (e.g., septic tanks) for their sanitation needs. Although onsite sanitation systems help in providing primary treatment for domestic wastewater, they don’t effectively remove nutrients, pathogens, and other inorganic contaminants. Previous studies have posited that the use of post treatment systems which incorporate biochar leads to improved contaminant removal efficiency. However, the mechanism through which contaminants ...
Tópico(s): Constructed Wetlands for Wastewater Treatment
2023 - Frontiers Media | Frontiers in Environmental Science
Katharine Conaway, Sarah Lebu, Kylie Heilferty, Aaron Salzberg, Musa Manga,
Different fecal sludge (FS) emptying practices have been documented worldwide, but little is known about how the type of on-site sanitation system (OSS) and other factors associated with emptying and transport influence how OSSs are emptied, nor about how FS is released to the environment during emptying. This systematic literature review assessed our current knowledge on OSS fecal sludge management practices and their impacts on pathogen releases into the environment including (i) the prevalence and ...
Tópico(s): Food Security and Health in Diverse Populations
2023 - Elsevier BV | Hygiene and Environmental Health Advances
Douglas Aghimien, Clinton Aigbavboa, Lerato Aghimien, Wellington Didibhuku Thwala, Lebu Ndlovu,
ABSTRACT This paper presents the findings of an assessment of the possible measures needed for the adoption of three-dimensional (3D) printing for sustainable low-income houses that can be beneficial to the urban poor. The study adopted a quantitative approach and answers were sought from construction professionals actively involved in a construction project in the country. The study revealed through factor analysis that 3D printing for sustainable low-income housing delivery in South Africa could ...
Tópico(s): Additive Manufacturing and 3D Printing Technologies
2021 - | Journal of Green Building
Delelegy Legese, Alemayehu Diriba Roba,
Forest is one of renewable land properties which endowed with numerous resources that are valuable to man. The quality of the environment is constantly losing its status due to increase in population size in most countries of the world. The general objective of this study was to assess the effect of population dynamics on forest cover in West Hararghe Zone in general and Daro Labu Wereda (DLW) in particular. Systematic random sampling technique was used to select the target population of this study ...
Tópico(s): African Botany and Ecology Studies
2021 - | International Journal of Research -GRANTHAALAYAH
Yanju Ma, Lihai Shang, Huijian Hu, Wei Zhang, Lianghua Chen, Zhixin Zhou, Paras B. Singh, Yiming Hu,
... soil and small mammals were collected in the Lebu Valley, East Himalayas of China, in order to ...
Tópico(s): Heavy metals in environment
2021 - Elsevier BV | Environmental Pollution
Megan Cherewick, Sarah Lebu, Christine Su, Lisa Richards, Prosper Njau, Ronald E. Dahl,
Abstract Background The transition from childhood to adolescence is a uniquely sensitive period for social and emotional learning in the trajectory of human development. This transition is characterized by rapid physical growth, sexual maturation, cognitive and behavioral changes and dynamic changes in social relationships. This pivotal transition provides a window of opportunity for social emotional learning that can shape early adolescent identity formation and gender norms, beliefs and behaviors. ...
Tópico(s): Child Development and Digital Technology
2021 - BioMed Central | BMC Public Health
Megan Cherewick, Sarah Lebu, Christine Su, Lisa Richards, Prosper Njau, Ronald E. Dahl,
Abstract Background Inequitable gender norms, beliefs and behaviors, are shaped by learning experiences during key developmental stages in an individual’s life course, and can have negative impacts on health and well-being outcomes. Very early adolescence represents one stage when formative learning experiences about gender inequity can have the potential to support or hinder more equitable gender norms, beliefs and behaviors. The aim of this qualitative study was to evaluate the effect of a gender ...
Tópico(s): Adolescent Sexual and Reproductive Health
2021 - BioMed Central | International Journal for Equity in Health