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Статті в журналах з теми "Buoyancy study"

Автор: Grafiati

Опубліковано: 3 червня 2025

Оновлено: 31 липня 2025

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1

Webb, P. M., D. E. Crocker, S. B. Blackwell, D. P. Costa, and B. J. Boeuf. "Effects of buoyancy on the diving behavior of northern elephant seals." Journal of Experimental Biology 201, no. 16 (1998): 2349–58. http://dx.doi.org/10.1242/jeb.201.16.2349.

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Marine mammals experience radical seasonal changes in body composition, which would be expected to affect their buoyancy in the water. The aim of this study was to examine the relationship between such changes in buoyancy and diving behavior in northern elephant seals Mirounga angustirostris. This was achieved by modifying the buoyancy of 13 juvenile elephant seals translocated from Año Nuevo State Reserve, CA, USA, and released at various sites in Monterey Bay, CA, USA. The buoyancy of each seal was calculated and was increased or decreased using syntactic foam or lead weights, and their divi

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2

Zaki, Fadlurrahman, and Dan Mugisidi. "Effect of buoyancy force on buoyancy waterwheel efficiency using numerical flow simulation." TEKNOSAINS : Jurnal Sains, Teknologi dan Informatika 11, no. 2 (2024): 209–21. http://dx.doi.org/10.37373/tekno.v11i2.976.

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In this work, the performance of a buoyant waterwheel to produce hydrokinetic power is investigated through analytical theory and computational fluid dynamics simulation. The impact of the buoyancy wheel is investigated by establishing the performance parameters through the use of a moving mesh approach and a realizable k-ε turbulence model. Transient simulation is required to comprehend the flow of physical processes. Using moving mesh as a transient methodology of the buoyancy waterwheel, numerical flow simulations and theoretical analytical methods are used in this study to assess the effec

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3

Li, Nga-wun, Chu-po Ho, Kit-lun Yick, and Jin-yun Zhou. "Comparison of test methods for measuring the net buoyant force of buoyant materials." Research Journal of Textile and Apparel 24, no. 2 (2020): 147–61. http://dx.doi.org/10.1108/rjta-08-2019-0036.

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Purpose Net buoyant force is a crucial factor affecting the functional performance of clothing for water safety. This study aims to develop an alternative method for measuring the net buoyant force of various buoyant materials such as buoyant fabrics, on a small scale in a more accurate and efficient way than the existing method. Design/methodology/approach The net buoyant forces of buoyant materials with different thicknesses and forms were determined and compared using three methods. In Method 1, the traditional method involving mathematical calculations was used; Method 2 involved using the

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4

Zeng, Tao, Ke Zhong, and Wanting Wang. "Overlap or breakthrough? exploration of the academic buoyancy structure in Chinese EFL learners." PLOS ONE 20, no. 1 (2025): e0318347. https://doi.org/10.1371/journal.pone.0318347.

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Academic buoyancy, recognized as a key component of positive personality traits in learning, has garnered significant attention. However, most research on buoyancy is limited to general educational contexts, lacking a comprehensive theoretical framework that poses challenges in evaluating buoyancy’s impact on learners within the domain of second language acquisition (SLA). This study seeks to bridge this gap by investigating academic buoyancy within the realm of foreign language learning, specifically among university students in mainland China studying English as a foreign language (EFL). The

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5

Gau, C., Y. C. Jeng, and C. G. Liu. "An Experimental Study on Mixed Convection in a Horizontal Rectangular Channel Heated From a Side." Journal of Heat Transfer 122, no. 4 (2000): 701–7. http://dx.doi.org/10.1115/1.1318211.

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Experiments are performed to study the mixed convection flow and heat transfer in a horizontal rectangular channel heated from a side. The channel is made of two vertical parallel plates with one of the plates heated uniformly and the opposite plate well insulated. The gap between the parallel plates is small and the height to gap ratio of the channel cross section is 6.67. Both flow visualization and the heat transfer along the heated wall are measured. The Reynolds number ranges from 317 to 2000, the buoyancy parameter, Gr/Re2, from 0 to 20000 and Pr of the air flow is 0.7. Flow structure in

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6

Kraft, Wayne N., and Malcolm J. Andrews. "Experimental Investigation of Unstably Stratified Buoyant Wakes." Journal of Fluids Engineering 128, no. 3 (2005): 488–93. http://dx.doi.org/10.1115/1.2174060.

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A water channel has been used as a statistically steady experiment to investigate the development of a buoyant plane wake. Parallel streams of hot and cold water are initially separated by a splitter plate and are oriented to create an unstable stratification. At the end of the splitter plate, the two streams are allowed to mix and a buoyancy-driven mixing layer develops. The continuous, unstable stratification inside the developing mixing layer provides the necessary environment to study the buoyant wake. Downstream a cylinder was placed at the center of the mixing layer. As a result the dyna

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7

CARDOSO, SILVANA S. S., and SEAN T. MCHUGH. "Turbulent plumes with heterogeneous chemical reaction on the surface of small buoyant droplets." Journal of Fluid Mechanics 642 (November 30, 2009): 49–77. http://dx.doi.org/10.1017/s0022112009991674.

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A model is developed for a turbulent plume with heterogeneous chemical reaction rising in an unbounded environment. The chemical reaction, which may generate or deplete buoyancy in the plume, occurs at the interface between two phases, a continuous phase and a dispersed one. We study the case in which a buoyant reactant is released at the source and forms the dispersed phase, consisting of very small bubbles, droplets or particles. Once in contact with the ambient fluid, a first-order irreversible reaction takes place at the surface of the, for example, droplets. The behaviour of this plume in

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8

Ma, Chengjing, Caiwen Zhang, and Guanxiong Li. "Parametric sensitivity study of unmanned buoyancy-lifting aerial vehicle." MATEC Web of Conferences 189 (2018): 08004. http://dx.doi.org/10.1051/matecconf/201818908004.

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Buoyancy-lifting aerial vehicle is a new development direction of the near space vehicle. This paper presents two conceptual schemes of unmanned buoyancy-lifting aerial vehicle with different configurations. The general parameter design method is studied, and the general parameter calculation model is established. The general parameters of airship and the buoyancy-lifting aerial vehicle are compared and studied. Taking buoyancy-lifting aerial vehicle with single fuselage and dual wings as the research object, sensitivity analysis of parameters has been done. The results show that compared with

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9

Panjwani, Divya R., and Balaji B. "Predictors of Academic Buoyancy: A Study of Demographic Correlates." ECS Transactions 107, no. 1 (2022): 6977–85. http://dx.doi.org/10.1149/10701.6977ecst.

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Academic buoyancy refers to to learners’ potential to face challenges and difficulties that are regular in nature under educational settings or environment. Demographic correlates were found and its effect on academic buoyancy was obtained through regression analysis. The sample consists of 1200 high school students belonging to three different boards of Lucknow City. Multiple regression analysis was done in variables where independent variables which are non-metric and a single dependent variable viz. academic buoyancy is metric in nature. Regression analysis is done through dummy coding wher

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10

Tiwari, B. K., Dr Rajiv Sharma, and Tae-Wan Kim. "EXPERIMENTAL STUDY OF A VARIABLE BUOYANCY SYSTEM FOR LOW DEPTH OPERATION." International Journal of Maritime Engineering 165, A1 (2023): 103–14. http://dx.doi.org/10.5750/ijme.v165ia1.1203.

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Autonomous Underwater Vehicles (AUVs) are used for the underwater survey both in coastal areas and deep sea without any human intervention during their operations. However, high energy consumptions required by the thrusters of the AUV’s adversely affect their performance such as range and endurance, etc. Herein, we have presented a novel design and development of a standalone variable buoyancy system for autonomous underwater vehicle and investigated the numerical and experimental analysis of Variable Buoyancy System (VBS) in standalone mode. Design idea is based upon the ‘Pump Driven Variable

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11

Mahajan, R. L., and D. Angirasa. "Combined Heat and Mass Transfer by Natural Convection With Opposing Buoyancies." Journal of Heat Transfer 115, no. 3 (1993): 606–12. http://dx.doi.org/10.1115/1.2910730.

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A numerical study is presented for combined heat and mass transfer by natural convection from a vertical surface with opposing buoyancy effects. A comparison with similarity solutions shows that boundary layer analysis is suitable only when the two buoyant forces aid each other. For opposing flows the boundary layer analysis does not predict the transport rates accurately. A detailed comparison with experimental data with opposing buoyancies shows good agreement between the data and the numerical solutions. The heat and mass transfer rates follow complex trends depending on the buoyancy ratio

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12

Epstein, M., and M. A. Kenton. "Combined Natural Convection and Forced Flow Through Small Openings in a Horizontal Partition, With Special Reference to Flows in Multicompartment Enclosures." Journal of Heat Transfer 111, no. 4 (1989): 980–87. http://dx.doi.org/10.1115/1.3250814.

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Estimates of the magnitude of buoyancy-driven exchange flows through openings in partitions that separate compartments are needed to assess the movement of toxic gases and smoke through buildings. An experiment using water and brine as a substitute for a light gas moving in a dense gas was designed to measure combined forced and buoyancy-driven exchange flow through a single opening in a horizontal partition. No theoretical treatment exists for this configuration. The same apparatus was used to determine the magnitude of the forced flow required to purge the opening of the oppositely directed

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13

Gleiss, Adrian C., Jean Potvin, and Jeremy A. Goldbogen. "Physical trade-offs shape the evolution of buoyancy control in sharks." Proceedings of the Royal Society B: Biological Sciences 284, no. 1866 (2017): 20171345. http://dx.doi.org/10.1098/rspb.2017.1345.

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Buoyancy control is a fundamental aspect of aquatic life that has major implications for locomotor performance and ecological niche. Unlike terrestrial animals, the densities of aquatic animals are similar to the supporting fluid, thus even small changes in body density may have profound effects on locomotion. Here, we analysed the body composition (lipid versus lean tissue) of 32 shark species to study the evolution of buoyancy. Our comparative phylogenetic analyses indicate that although lean tissue displays minor positive allometry, liver volume exhibits pronounced positive allometry, sugge

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14

He, Xin Zhi, De Cai Li, Wen Ming Yang, and Hai Na Zhang. "Experimental Study on the Second-Order Buoyancy of Magnetic Fluid." Key Engineering Materials 512-515 (June 2012): 1464–69. http://dx.doi.org/10.4028/www.scientific.net/kem.512-515.1464.

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The buoyancy principle of magnetic fluid is one of the most attractive effects of magnetic fluid statics. But it is too difficult to calculate the buoyancy directly due to the complexity of magnetic field. Moreover, numerical calculation employs too many assumptions. So in this paper the experimental method is adopted to measure the second-order buoyancy received by permanent magnet immersed in magnetic fluid, which depends on the distance between the magnet and the wall of vessel. The influence of the diameter of cylindrical vessels, the size of magnets and the saturation magnetization of mag

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15

Fan, Zhisong, Changjie Xu, Kelang Yang, Xiuli Xue, and Chaofeng Zeng. "Experimental Study on the Influence of Rising Water Levels on the Buoyancy of Building Structure." Water 17, no. 9 (2025): 1377. https://doi.org/10.3390/w17091377.

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This study investigates the complete process of water level elevation’s impact on structural buoyancy under varying environmental conditions (with/without surrounding barriers) using model testing. The experiments simulated the buoyancy response patterns in sandy soil layers under different hydraulic heads. Dynamic variations of structural buoyancy over time were systematically analyzed, revealing distinct differences across the working conditions. The key findings demonstrate: (1) in the presence of the barrier effect, the growth of structure buoyancy is significantly slower than that without

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16

Stein, W., and H. Brandt. "A Numerical Study of Turbulent Heat Transfer in a Spherical Annulus." Journal of Heat Transfer 110, no. 4a (1988): 870–76. http://dx.doi.org/10.1115/1.3250587.

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A numerical study of steady, buoyant, incompressible water flow and heat transfer through a spherical annulus has been made. A two-dimensional computer code based on the TEACH code was rewritten in spherical coordinates to model the Navier–Stokes equation and to model fluid turbulence with a k–ε turbulence model. Results are given for the total system Nusselt number, local heat transfer rate, and fluid flow characteristics for both buoyant and nonbuoyant laminar and turbulence modeled flow. Incorporating both the turbulence model and buoyancy into the calculations improves the results.

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17

Chen, Yen-Cho, and J. N. Chung. "The linear stability of mixed convection in a vertical channel flow." Journal of Fluid Mechanics 325 (October 25, 1996): 29–51. http://dx.doi.org/10.1017/s0022112096008026.

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In this study, the linear stability of mixed-convection flow in a vertical channel is investigated for both buoyancy-assisted and -opposed conditions. The disturbance momentum and energy equations were solved by the Galerkin method. In addition to the case with a zero heat flux perturbation boundary condition, we also examined the zero temperature perturbation boundary condition. In general, the mixed-convection flow is strongly destabilized by the heat transfer and therefore the fully developed heated flow is very unstable and very difficult to maintain in nature. For buoyancy-assisted flow,

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18

Augier, Pierre, Paul Billant, and Jean-Marc Chomaz. "Stratified turbulence forced with columnar dipoles: numerical study." Journal of Fluid Mechanics 769 (March 25, 2015): 403–43. http://dx.doi.org/10.1017/jfm.2015.76.

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This paper builds upon the investigation of Augier et al. (Phys. Fluids, vol. 26 (4), 2014) in which a strongly stratified turbulent-like flow was forced by 12 generators of vertical columnar dipoles. In experiments, measurements start to provide evidence of the existence of a strongly stratified inertial range that has been predicted for large turbulent buoyancy Reynolds numbers $\mathscr{R}_{t}={\it\varepsilon}_{\!K}/({\it\nu}N^{2})$, where ${\it\varepsilon}_{\!K}$ is the mean dissipation rate of kinetic energy, ${\it\nu}$ the viscosity and $N$ the Brunt–Väisälä frequency. However, because o

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19

Manoubi, Maha, Maxime LaFlèche, Zhe Liang, and Matei Radulescu. "EXPERIMENTAL STUDY OF COMBUSTION CHARACTERISTICS OF ISOLATED POCKETS OF HYDROGEN-AIR MIXTURES." CNL Nuclear Review 5, no. 1 (2016): 133–42. http://dx.doi.org/10.12943/cnr.2015.00062.

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This paper examines the dynamics of unconfined hydrogen–air flames and the criterion for flame propagation between neighbouring pockets of reactive gas separated by air using the soap bubble technique. The combustion events were visualized using high-speed schlieren or large-scale shadowgraph systems. It was revealed that for sufficiently lean hydrogen–air mixtures characterized by low flame speeds, buoyancy effects become important at small scales. The critical radius of hemispherical flame that will rise due to buoyancy is highly sensitive to the hydrogen concentration. The test results demo

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20

Tiwari, B. K., and R. Sharma. "Study on System Design and Integration of Variable Buoyancy Systems for Underwater Operation." Defence Science Journal 71, no. 1 (2021): 124–33. http://dx.doi.org/10.14429/dsj.71.15557.

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This paper presents the design and analysis of the ‘Variable Buoyancy System (VBS)’ for depth control which is an essential operation for all underwater vehicles. We use the ‘Water Hydraulic Variable Buoyancy System (WHVBS)’ method to control the buoyancy and discuss details of the system design architecture of various components of VBS. The buoyancy capacity of the developed VBS is five kilograms and the performance of the VBS in standalone mode is analysed using numerical simulation. Presented VBS is operable to control the buoyancy up to sixty meters of depth and it can be directly installe

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21

Kapus, Jernej, Jure Jazbec, Petra Prevc, Samo Rauter, and Igor Štirn. "BUOYANCY ASSESSED WITH FLOATING TESTS AND UNDERWATER WEIGHING. A PILOT STUDY." Kinesiologia Slovenica 30, no. 1 (2024): 5–19. http://dx.doi.org/10.52165/kinsi.30.1.5-19.

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The aim of the present study was to compare the buoyancy assessed by floating tests with the buoyancy calculated using the variables measured during underwater weighing. We also aimed to evaluate the relationship between assessed buoyancy and body composition. Twenty-seven women (age: 20 ± 3 years, height: 1.66 ± 0.34 m, weight: 62 ± 7 kg; body mass index: 22 ± 2; vital capacity: 4.26 ± 0.47 l) and twenty-six men (age: 19 ± 2 years, height: 1.81 ± 6.76 m, weight: 79 ± 10 kg body mass index: 24 ± 3; vital capacity: 6.05 ± 0.7 l) volunteered to participate in the study. They performed floating t

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22

Zhang, Hailong, Guoliang Ma, and Zhiwei Zhu. "Serviceability Properties of Solid Buoyancy Materials for Deep-Sea HOV." Advances in Materials Science and Engineering 2022 (December 6, 2022): 1–10. http://dx.doi.org/10.1155/2022/6806153.

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Studying the evolution characteristics of damage strength and water absorption behavior of hollow glass beads solid buoyancy materials used for manned submersibles in the hyper-pressure environment will help people to understand the damage mechanism and induced mechanism of buoyancy materials for manned submersibles. To explore the influence mechanism of different pressure, temperature, loading rate and load cycle times on deformation, failure, and water absorption behavior of solid buoyant materials, hydrostatic pressure tests of solid buoyant materials under different conditions are conducte

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23

McLean, Scott P., and Richard N. Hinrichs. "Buoyancy, Gender, and Swimming Performance." Journal of Applied Biomechanics 16, no. 3 (2000): 248–63. http://dx.doi.org/10.1123/jab.16.3.248.

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This study investigated the relationship of gender and buoyancy to sprint swimming performance. The center of buoyancy (CB) and center of mass (CM) were measured using reaction board principles. Performance was evaluated as the time needed to complete the middle 13.7 m of a 22.9-m sprint for kicking and swimming trials. Nineteen female swimmers (mean ±SD, 21.9 ± 3.2 years) had significantly more body fat (24.1 ± 4.5%) than 13 male swimmers (21.7 ± 4.2 years, 14.8 ± 5.0%). Males swam and kicked significantly faster (p< .01) than females. Percent body fat, upper body strength, the distance be

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24

Zhang, A. M., P. Cui, J. Cui, and Q. X. Wang. "Experimental study on bubble dynamics subject to buoyancy." Journal of Fluid Mechanics 776 (July 6, 2015): 137–60. http://dx.doi.org/10.1017/jfm.2015.323.

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This paper is concerned with the dynamics of large bubbles subject to various strengths of buoyancy effects, which are associated with applications for underwater explosion. The bubble is produced by electric discharge in a low-pressure tank to enhance the buoyancy effects. Experiments are carried out for a bubble in an infinite field, below a free surface and above a rigid boundary. The effects of buoyancy are reflected by the dimensionless parameter ${\it\delta}=\sqrt{{\it\rho}gR_{m}/(p_{amb}-p_{v})}$, where $R_{m}$, $p_{amb}$, $p_{v}$, ${\it\rho}$ and $g$ are the maximum bubble radius, ambi

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25

Zhu, Xia Qing. "Study on the Dynamic Quantitative Weighing System Based on the Buoyancy Weighing Sensor." Advanced Materials Research 912-914 (April 2014): 1416–19. http://dx.doi.org/10.4028/www.scientific.net/amr.912-914.1416.

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The dynamic quantitative weighing system based on the buoyancy weighing sensor is designed in this paper. At first the principle of the dynamic quantitative weighing system is analyzed and then the mathematical model is established. Secondly the hardware structure of the dynamic weighing system is designed. The buoyancy weighing sensor is introduced. The weighing system is composed of two parts: the buoyancy equalizer and the displacement sensor. Through the field tests, precision, stability and sensitivity of the device has been verified.

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26

Wacławczyk, M., J. L. Nowak, J. C. Vassilicos, S. Król, and S. P. Malinowski. "Turbulent cascades in the Atmospheric Boundary Layers." Journal of Physics: Conference Series 2899, no. 1 (2024): 012019. http://dx.doi.org/10.1088/1742-6596/2899/1/012019.

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Abstract We investigate the scale-by-scale budget of the turbulence kinetic energy in the Atmospheric Boundary Layer (ABL) using airborne measurements performed by the helicopter-borne measurement system HELiPOD over the Baltic sea. The available, long time series of the turbulent wind velocity, temperature and humidity allow for a detailed study of turbulence properties in the ABL over the Baltic sea. In particular, we calculate the buoyancy forcing term and the third-order velocity structure function. The buoyancy’s production of turbulence energy is only significant at the largest-scales, a

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27

Mohd Rustam Mohd Rameli, Najua Syuhada Ahmad Alhassora, Adjah Naqkiah Mazlan, Teoh Sian Hoon, Siti Rosiah Mohamed, and Joseph Boon Zik Hong. "Relationship between Self-regulated Learning with Academic Buoyancy: A Case Study among Malaysia FELDA Secondary School Students." Journal of Advanced Research in Applied Sciences and Engineering Technology 45, no. 1 (2024): 202–14. http://dx.doi.org/10.37934/araset.45.1.202214.

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Prior studies offer descriptive accounts of empirical evidence on the positive relation between self-regulated learning towards various academic outcomes. However, lack of studies looks into the relation between self-regulated learning specifically with academic buoyancy in secondary school mathematics learning. Therefore, this correlational study aims to assess the relationship between self-regulated learning and academic buoyancy in the context of mathematics learning. Using a sample of 463 secondary school students from FELDA area (southern and east coast area), data were collected from Aca

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28

Wang, Yonggang, Bart Geerts, and Jeffrey French. "Dynamics of the Cumulus Cloud Margin: An Observational Study." Journal of the Atmospheric Sciences 66, no. 12 (2009): 3660–77. http://dx.doi.org/10.1175/2009jas3129.1.

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Abstract Aircraft observations of shallow to moderately deep cumulus clouds are analyzed with the purpose of describing the typical horizontal structure of thermodynamic and kinematic parameters near the cumulus margin from the cloud center into the ambient clear air. The cumuli were sampled in a broad range of environments in three regions: the tropical Atlantic Ocean in winter, the Sonoran Desert during the monsoon, and the arid high plains of Wyoming in summer. The composite analysis of 1624 cumulus penetrations shows that the vertical mass flux, temperature, buoyancy, the buoyancy flux, an

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29

Katalbas, Dubhe Ann, Cecille Ng, and Voltaire Marquez. "An Investigation of the Relationship between Academic Buoyancy and Academic Performance among Senior High School Students: A Quantitative Research Approach." International Journal of Metaverse 1, no. 1 (2023): 11–16. http://dx.doi.org/10.54536/ijm.v1i1.1474.

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Academic buoyancy is a student’s ability to effectively deal with academic setbacks and challenges. This study aimed to determine whether academic buoyancy predicts academic performance among high school students. The objective of this study was to investigate the relationship between academic buoyancy and academic performance among high school students. Participants were 142 high school students who completed a questionnaire that included measures of academic buoyancy and grade point average (GPA). Data were analyzed using simple linear regression and frequency distribution. The results showe

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30

Wang, Yang, Le Yu, Tianci Yin, Lanbing Yu, and Zhitao Huo. "Stability Analysis of Partially Submerged Landslide with the Consideration of the Relationship between Porewater Pressure and Seepage Force." Geofluids 2018 (2018): 1–9. http://dx.doi.org/10.1155/2018/9145830.

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For partially submerged landslides, hydrostatic and hydrodynamic pressures, related to water level fluctuation and rainfall, are usually expressed in the form of porewater pressure, seepage force, and buoyancy. There are some connections among them, but it is very easy to confuse one force with another. This paper presents a modified mathematical expression for stability analysis of partially submerged landslide and builds the relationship between porewater pressures and buoyancy acting on the underwater zone of partially submerged landslide and the relationship among porewater pressures, seep

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31

Bouquet, Serge, Pierre Gandeboeuf, and Pierre Pailhoriès. "Analytical study of the buoyancy–drag equation." Mathematical Methods in the Applied Sciences 30, no. 16 (2007): 2027–35. http://dx.doi.org/10.1002/mma.944.

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32

Kanu, Priya. "Building Resilience: Exploring the Interplay of Workplace and Academic Buoyancy." International Journal of Advance and Applied Research 4, no. 29 (2023): 46–55. https://doi.org/10.5281/zenodo.8363181.

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<strong>Abstract:</strong> This research paper explores the interconnectedness of academic buoyancy and workplace buoyancy in fostering overall resilience. Academic buoyancy, known for its role in helping individuals bounce back from academic setbacks, and workplace buoyancy, focused on thriving in professional environments, are examined for their potential synergies. By analyzing existing literature and employing a mixed-methods approach, the study reveals correlations between these two forms of buoyancy. Findings suggest that higher levels of academic buoyancy often coincide with elevated wo

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33

Snider, D. M., and M. J. Andrews. "The Simulation of Mixing Layers Driven by Compound Buoyancy and Shear." Journal of Fluids Engineering 118, no. 2 (1996): 370–76. http://dx.doi.org/10.1115/1.2817388.

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Fully developed compound shear and buoyancy driven mixing layers are predicted using a k-ε turbulence model. Such mixing layers present an exchange of equilibrium in mixing flows. The k-ε buoyancy constant Cε3 = 0.91, defined in this study for buoyancy unstable mixing layers, is based on an approximate self-similar analysis and an accurate numerical solution. One-dimensional transient and two-dimensional steady calculations are presented for buoyancy driven mixing in a uniform flow field. Two-dimensional steady calculations are presented for compound shear and buoyancy driven mixing. The compu

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34

Rohinsa, Meilani, Surya Cahyadi, Achmad Djunaidi, and Tb Zulrizka Iskandar. "The Role of Personality Traits in Predicting Senior High School Students’ Academic Buoyancy." Journal of Social Sciences Research, no. 59 (September 20, 2019): 1336–40. http://dx.doi.org/10.32861/jssr.59.1336.1340.

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All students have to face academic pressures, setbacks and challenges that are part of their everyday academic life. The capacity to deal with this, i.e. ‘academic buoyancy’, is needed to reduce the impact of academic adversity. Since academic buoyancy may be associated with personality, our study explored the role of personality trait, especially the ‘big five’, as predictors of the academic buoyancy in senior high school students in an Eastern culture. Methods: Using quota sampling, 356 respondents were sampled from the eight largest senior high schools in Bandung, Indonesia. Five personalit

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35

Morrison, Hugh. "Impacts of Updraft Size and Dimensionality on the Perturbation Pressure and Vertical Velocity in Cumulus Convection. Part I: Simple, Generalized Analytic Solutions." Journal of the Atmospheric Sciences 73, no. 4 (2016): 1441–54. http://dx.doi.org/10.1175/jas-d-15-0040.1.

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Abstract This study investigates relationships between vertical velocity, perturbation pressure, updraft size, and dimensionality for cumulus convection. Generalized theoretical expressions are derived from approximate analytic solutions of the governing momentum and mass continuity equations for both two-dimensional (2D) and axisymmetric quasi-three-dimensional (3D) steady-state updrafts. These expressions relate perturbation pressure and vertical velocity to updraft radius R, height H, and thermal buoyancy. They suggest that the vertical velocity at the level of neutral buoyancy is reduced f

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36

Stephenson, Richard. "The contributions of body tissues, respiratory system, and plumage to buoyancy in waterfowl." Canadian Journal of Zoology 71, no. 8 (1993): 1521–29. http://dx.doi.org/10.1139/z93-215.

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This study examines buoyancy partitioning between body compartments in diving and surface-feeding Anatidae. Body tissue and plumage densities and the volumes of air in the respiratory system and plumage were analyzed using cadavers and restrained live specimens of waterfowl. The densities of the skeleton and remiges of surface feeders were significantly lower than those of divers but the differences were not sufficient to significantly reduce the body tissue density and buoyant force of divers. There were no other statistically significant differences in the body tissue densities of diving and

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37

., Chanchal, Saurav Kumar, and Satinder Kakar. "A REVIEW ON FLOATING TABLET." Indian Journal of Pharmaceutical and Biological Research 6, no. 01 (2018): 22–29. http://dx.doi.org/10.30750/ijpbr.6.1.4.

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Pharmaceutical industries have received much interest in pharmaceutical research in the area of oral drug delivery more over on Gastro retentive drug delivery system that is Floating Drug Delivery System (FDDS).The objective of this study to review on FDDS focusing on its current advancement and its future. Floating systems are low density systems that have sufficiently buoyancy to flow over the gastric contents and remain buoyant in the stomach without affecting the gastric emptying rate for a prolonged period of time. Floating dosage forms can be prepared as tablets, capsule by adding suitab

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38

Choudhary, Chanchal, Yogendra Malviya, and Vikas Jain. "A REVIEW ON FLOATING TABLET." International Journal of Pharmaceutical Sciences and Medicine 8, no. 4 (2023): 18–30. http://dx.doi.org/10.47760/ijpsm.2023.v08i04.002.

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Анотація:

Pharmaceutical industries have received much interest in pharmaceutical research in the area of oral drug delivery more over on Gastro retentive drug delivery system that is Floating Drug Delivery System (FDDS).The objective of this study to review on FDDS focusing on its current advancement and its future. Floating systems are low density systems that have sufficiently buoyancy to flow over the gastric contents and remain buoyant in the stomach without affecting the gastric emptying rate for a prolonged period of time. Floating dosage forms can be prepared as tablets, capsule by adding suitab

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39

Aloka, Peter J. O. "Social comparison and academic buoyancy among freshmen in one selected public university." EUREKA: Social and Humanities, no. 3 (May 31, 2022): 49–59. http://dx.doi.org/10.21303/2504-5571.2022.002447.

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The study examined the relationship between social comparison and academic buoyancy among freshmen in one selected public university in Kenya. The study adopted cross-sectional survey research design. The social comparison and academic buoyancy scales were used to collect data. The sample size of the study consisted of 213 freshmen from one selected public university in the western part of Kenya. The data collected were analyzed using descriptive statistics, and inferential statistics, such as Pearson correlation coefficient and regression analysis statistical techniques. It was established, t

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40

Aloka, Peter J. O. "Social comparison and academic buoyancy among freshmen in one selected public university." EUREKA: Social and Humanities, no. 3 (May 31, 2022): 49–59. https://doi.org/10.21303/2504-5571.2022.002447.

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Анотація:

The study examined the relationship between social comparison and academic buoyancy among freshmen in one selected public university in Kenya. The study adopted cross-sectional survey research design. The social comparison and academic buoyancy scales were used to collect data. The sample size of the study consisted of 213 freshmen from one selected public university in the western part of Kenya. The data collected were analyzed using descriptive statistics, and inferential statistics, such as Pearson correlation coefficient and regression analysis statistical techniques. It was established, t

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41

Lei, Yu, Jian Zhou, Guizhen Liu, Lin Wang, and Zhongjun Ding. "Study of Ceramic Hollow Buoyant Balls Prepared Based on Slip Mold Casting and Brazing Process." Coatings 14, no. 6 (2024): 767. http://dx.doi.org/10.3390/coatings14060767.

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In the domain of deep-sea buoyancy material applications, hollow ceramic spheres, known for their high strength and low mass-to-drainage ratio, contribute to increased buoyancy and payload capacity enhancement for deep submersibles, constituting buoyancy materials of exceptional overall performance. This study entails the brazing of two ceramic hemispherical shells, obtained through slurry molding, to form a ceramic float. This process, which integrates slurry molding and ceramic brazing, facilitates buoyancy provision. Further refinement involves welding a ceramic connector onto the ceramic s

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42

Palko, David, and Henryk Anglart. "Theoretical and Numerical Study of Heat Transfer Deterioration in High Performance Light Water Reactor." Science and Technology of Nuclear Installations 2008 (2008): 1–5. http://dx.doi.org/10.1155/2008/405072.

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A numerical investigation of the heat transfer deterioration (HTD) phenomena is performed using the low-Re k-ωturbulence model. Steady-state Reynolds-averaged Navier-Stokes equations are solved together with equations for the transport of enthalpy and turbulence. Equations are solved for the supercritical water flow at different pressures, using water properties from the standard IAPWS (International Association for the Properties of Water and Steam) tables. All cases are extensively validated against experimental data. The influence of buoyancy on the HTD is demonstrated for different mass fl

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43

Kiyosuke, Hayato, Takashi Kurabuchi, Yoshihiro Toriumi, Yuki Simanuki, and Yasuhisa asawa. "Study on Reproduction of Thermal Plume over a Gas Stove by CFD." E3S Web of Conferences 111 (2019): 01096. http://dx.doi.org/10.1051/e3sconf/201911101096.

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In order to create a comfortable environment in the work place around commercial kitchen, it is desirable to accurately predict the capture efficiency of exhaust from the cooking appliance by CFD. Due to insufficient diffusion in buoyant plume, however capture efficiency tends to be overestimated in the k-ε model. In this study, we confirmed that the problem of the k−ε model in the prediction of plume is originated from the buoyancy production of the turbulent kinetic energy by comparing among the measurement value, simulated results using the LES model and the k−ε model, and possible remedy f

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44

Ismail, Zuhdi, and Renanta Hayu Kresiani. "Correction of Air Buoyancy on E0-74 Mass Measurement with Pt-Ir K-112 Standard." Journal of Physics: Theories and Applications 5, no. 2 (2021): 69. http://dx.doi.org/10.20961/jphystheor-appl.v5i2.59192.

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Determination of the mass value of E<sub>0</sub> no 74 by calibrating it using the Pt-Ir standard has high complexity. This is caused by a significant difference in the density of standards. In this study, the E<sub>0</sub> no 74 made of stainless steel has a density of 8.051.130 kg.m<sup>−3</sup> calibrated by a mass standard of Pt-Ir which has a density of 21.552.940 kg.m<sup>−3</sup>. <em>By</em> Archimedes' law, the buoyant force generated by the air due to this density difference is huge. Therefore, the correction of air buoyancy

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45

Barrios-Piña, Hector, Hermilo Ramírez-León, and Carlos Couder-Castañeda. "Analysis of Flow Evolution and Thermal Instabilities in the Near-Nozzle Region of a Free Plane Laminar Jet." Mathematical Problems in Engineering 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/891894.

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This work focuses on the evolution of a free plane laminar jet in the near-nozzle region. The jet is buoyant because it is driven by a continuous addition of both buoyancy and momentum at the source. Buoyancy is given by a temperature difference between the jet and the environment. To study the jet evolution, numerical simulations were performed for two Richardson numbers: the one corresponding to a temperature difference slightly near the validity of the Boussinesq approximation and the other one corresponding to a higher temperature difference. For this purpose, a time dependent numerical mo

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46

Yang, Muqing, Dongli Ma, and Liang Zhang. "Numerical Study on Buoyancy-Driven Görtler Vortices above Horizontal Heated Flat Plate." Aerospace 10, no. 8 (2023): 685. http://dx.doi.org/10.3390/aerospace10080685.

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The temperature of the solar cells on the upper surface of a solar unmanned aerial vehicle (UAV) wing is much higher than the atmospheric temperature during flight. The temperature difference will induce buoyancy-driven Görtler vortices that may influence the aerodynamic characteristics of the wing. In the present study, a hybrid RANS-LES-based approach was used to simulate the flow above a heated flat plate under different flow velocities (from 0.34 m/s to 0.63 m/s) and temperature differences (from 0 K to 60 K), and the influence of Görtler vortices on the flow was analyzed. The existence of

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47

Zou, Yi, Xinyu Xue, Lizhen Jin, Xiao Huang, and Yanbing Li. "IMPROVING LOWER SECONDARY SCHOOL STUDENTS’ KNOWLEDGE INTEGRATION OF BUOYANCY THROUGH ENHANCING THEIR UNDERSTANDING OF THE NATURE OF BUOYANCY." Journal of Baltic Science Education 22, no. 6 (2023): 1120–36. http://dx.doi.org/10.33225/jbse/23.22.1120.

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In recent years, developing students’ knowledge integration of specific topics through effective teaching methods has been a concern in science education. This study explored an alternative teaching method, which aims to help lower secondary school students develop their knowledge structure about buoyancy towards a logically integrated conceptual framework through enhancing their understanding of the nature of buoyancy. Specifically, this study constructed a conceptual framework on buoyancy and a set of matching test questions to map out the three levels of knowledge integration of students, a

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48

Abdellatif, Mohamed Sayed. "Academic buoyancy of university students and its relationship to academic average in light of some demographic variables." Cypriot Journal of Educational Sciences 17, no. 7 (2022): 2361–70. http://dx.doi.org/10.18844/cjes.v17i7.7599.

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Academic buoyancy reflects the student's ability to encounter the ordinary challenges he faces in the academic context, and it positively contributes to the student's behaviors. This study aims to measure the level of academic buoyancy among university students, identify its relationship to their academic average, and determine the differences in their academic buoyancy level in terms of gender and academic discipline variables. The descriptive-analytical research design was utilized. The academic buoyancy scale was applied to (243) university students (male-female). Data were statistically an

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Priyanka, Lekhwar, P. K. Sahoo Dr., and Agarwal |. Amit Sharma Ravindra. "Development of Gastroretentive Floating Tablets Quetiapine Fumarate." International Journal of Trend in Scientific Research and Development 3, no. 4 (2019): 1037–40. https://doi.org/10.31142/ijtsrd24051.

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The idea of the study is to prepare and characterize a sustain release floating tablets of Quetiapine Fumarate for Schizophrenia. Materials which are used in making of effervescent Tablets are hydroxy methylcellulose HPMC. For the buoyancy sodium bicarbonate is used. Initially for the selection of formulation Definitive screening design is used which allows to study the effect of large number of factors in relatively small experiment. The optimized formulation is tested for release rate, buoyancy, hardness, thickness, floating time, swelling study and release rate. These studies shows that opt

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Martin, Andrew J., and Herbert W. Marsh. "Investigating the reciprocal relations between academic buoyancy and academic adversity: Evidence for the protective role of academic buoyancy in reducing academic adversity over time." International Journal of Behavioral Development 44, no. 4 (2019): 301–12. http://dx.doi.org/10.1177/0165025419885027.

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What is the relationship between academic buoyancy and academic adversity? For example, does the experience of academic adversity help build students’ academic buoyancy in school—or, does academic buoyancy lead to decreases in subsequent academic adversity? This longitudinal study of 481 high school students (Years 7–12) investigated the relations between academic buoyancy and academic adversity. Harnessing a cross-lagged panel design spanning two consecutive academic years, we employed structural equation modeling to investigate the extent to which prior academic buoyancy predicted subsequent

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