Academic literature on the topic 'Balance domains'
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Journal articles on the topic "Balance domains"
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Penney, Christopher R., James G. Combs, Nolan Gaffney, and Jennifer C. Sexton. "A jack-of-all-trades or a master of none: the performance effects of balancing exploration and exploitation within vs across alliance portfolio domains." Journal of Knowledge Management 24, no. 3 (September 6, 2018): 569–87. http://dx.doi.org/10.1108/jkm-09-2017-0395.
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Purpose Theory predicts that balancing exploratory and exploitative learning (i.e., ambidexterity) across alliance portfolio domains (e.g. value chain function, governance modes) increases firm performance, whereas balance within domains decreases performance. Prior empirical work, however, only assessed balance/imbalance within and across two domains. The purpose of this study is to determine if theory generalizes beyond specific domain combinations. The authors investigated across multiple domains to determine whether alliance portfolios should be imbalanced toward exploration or exploitation within domains or balanced across domains. The authors also extended prior research by exploring whether the direction of imbalance matters. Current theory only advises managers to accept imbalance without helping with the choice between exploration and exploitation. Design/methodology/approach Hypotheses are tested using fixed-effects generalized least squares (GLS) regression analysis of a large 13-year panel sample of Fortune 500 firms from 1996 to 2008. Findings With respect to the balance between exploration and exploitation within each of the five domains investigated, imbalanced alliance portfolios had higher firm performance. No evidence was found that balance across domains relates to performance. Instead, for four of the five domains, imbalance toward exploration related positively to firm performance. Originality/value An alliance portfolio that allows for exploration in some domains and exploitation in other domains appears more difficult to implement than prior theory suggests. Firms benefit mostly from using the alliance portfolio for exploratory learning.
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Gragnano, Andrea, Silvia Simbula, and Massimo Miglioretti. "Work–Life Balance: Weighing the Importance of Work–Family and Work–Health Balance." International Journal of Environmental Research and Public Health 17, no. 3 (February 1, 2020): 907. http://dx.doi.org/10.3390/ijerph17030907.
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To date, research directed at the work–life balance (WLB) has focused mainly on the work and family domains. However, the current labor force is heterogeneous, and workers may also value other nonworking domains besides the family. The aim of this study was to investigate the importance of other nonworking domains in the WLB with a particular focus on health. Moreover, the importance of the effects of the work–family balance (WFB) and the work–health balance (WHB) on job satisfaction was investigated. Finally, we explored how the effects of the WFB and the WHB on job satisfaction change according to worker characteristics (age, gender, parental status, and work ability). This study involved 318 workers who completed an online questionnaire. The importance of the nonworking domains was compared with a t-test. The effect of the WFB and the WHB on job satisfaction was investigated with multiple and moderated regression analyses. The results show that workers considered health as important as family in the WLB. The WHB explained more of the variance in job satisfaction than the WFB. Age, gender and parental status moderated the effect of the WFB on job satisfaction, and work ability moderated the effect of the WHB on job satisfaction. This study highlights the importance of the health domain in the WLB and stresses that it is crucial to consider the specificity of different groups of workers when considering the WLB.
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Davis, Laura J., Anna M. McGarr, Claudia Espina Bresnahan, Acadia L. Clohesey, Michelle E. Judge, Miran D. McCash, Juhanna T. Roberts, Christopher Villarosa, Toshiki Kobayashi, and Michael S. Orendurff. "Unique Balance Domains for Balance Error Scoring System (BESS) and Y-Balance Tests." Medicine & Science in Sports & Exercise 48 (May 2016): 438. http://dx.doi.org/10.1249/01.mss.0000486318.26227.c3.
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Taylor, Morag E., Annika Toots, Stephen R. Lord, Narelle Payne, and Jacqueline C. T. Close. "Cognitive Domain Associations with Balance Performance in Community-Dwelling Older People with Cognitive Impairment." Journal of Alzheimer's Disease 81, no. 2 (May 18, 2021): 833–41. http://dx.doi.org/10.3233/jad-201325.
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Background: In older people with cognitive impairment (CI), executive function (EF) has been associated with motor performance including balance and gait. The literature examining and supporting a relationship between balance performance and other cognitive domains is limited. Objective: To investigate the relationship between global cognition and cognitive domain function and balance performance in older people with CI. Methods: The iFOCIS randomized controlled trial recruited 309 community-dwelling older people with CI. Baseline assessments completed before randomization were used for analyses including the Addenbrooke’s Cognitive Examination-III (ACE-III; global cognition) and its individual cognitive domains (attention; memory; verbal fluency; language; visuospatial ability) and the Frontal Assessment Battery (FAB), a measure of EF. A composite balance score was derived from postural sway and leaning balance tests. Results: In linear regression analyses adjusted for covariates, global cognition and each cognitive domain were significantly associated with balance performance. EF (verbal fluency; β= –0.254, p < 0.001, adjusted R2 = 0.387) and visuospatial ability (β= –0.258, p < 0.001, adjusted R2 = 0.391) had the strongest associations with balance performance. In a comprehensively adjusted multivariable model including all of the ACE-III cognitive domains, visuospatial ability and EF (verbal fluency) were independently and significantly associated with balance performance. Conclusion: Poorer global cognition and cognitive domain function were associated with poorer balance performance in this sample of people with CI. Visuospatial ability and EF were independently associated with balance, highlighting potential shared neural networks and the role higher-level cognitive processes and spatial perception/processing play in postural control.
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Milyavskaya, Marina, Isabelle Gingras, Geneviève A. Mageau, Richard Koestner, Hugo Gagnon, Jianqun Fang, and Julie Boiché. "Balance Across Contexts: Importance of Balanced Need Satisfaction Across Various Life Domains." Personality and Social Psychology Bulletin 35, no. 8 (July 10, 2009): 1031–45. http://dx.doi.org/10.1177/0146167209337036.
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Sun, Ke, Hong Liu, Qixiang Ye, Yue Gao, Jianzhuang Liu, Ling Shao, and Rongrong Ji. "Domain General Face Forgery Detection by Learning to Weight." Proceedings of the AAAI Conference on Artificial Intelligence 35, no. 3 (May 18, 2021): 2638–46. http://dx.doi.org/10.1609/aaai.v35i3.16367.
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In this paper, we propose a domain-general model, termed learning-to-weight (LTW), that guarantees face detection performance across multiple domains, particularly the target domains that are never seen before. However, various face forgery methods cause complex and biased data distributions, making it challenging to detect fake faces in unseen domains. We argue that different faces contribute differently to a detection model trained on multiple domains, making the model likely to fit domain-specific biases. As such, we propose the LTW approach based on the meta-weight learning algorithm, which configures different weights for face images from different domains. The LTW network can balance the model's generalizability across multiple domains. Then, the meta-optimization calibrates the source domain's gradient enabling more discriminative features to be learned. The detection ability of the network is further improved by introducing an intra-class compact loss. Extensive experiments on several commonly used deepfake datasets to demonstrate the effectiveness of our method in detecting synthetic faces. Code and supplemental material are available at https://github.com/skJack/LTW.
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Ruffolo, David, Nawin Ngampoopun, Yash R. Bhora, Panisara Thepthong, Peera Pongkitiwanichakul, William H. Matthaeus, and Rohit Chhiber. "Domains of Magnetic Pressure Balance in Parker Solar Probe Observations of the Solar Wind." Astrophysical Journal 923, no. 2 (December 1, 2021): 158. http://dx.doi.org/10.3847/1538-4357/ac2ee3.
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Abstract The Parker Solar Probe (PSP) spacecraft is performing the first in situ exploration of the solar wind within 0.2 au of the Sun. Initial observations confirmed the Alfvénic nature of aligned fluctuations of the magnetic field B and velocity V in solar wind plasma close to the Sun, in domains of nearly constant magnetic field magnitude ∣ B ∣, i.e., approximate magnetic pressure balance. Such domains are interrupted by particularly strong fluctuations, including but not limited to radial field (polarity) reversals, known as switchbacks. It has been proposed that nonlinear Kelvin–Helmholtz instabilities form near magnetic boundaries in the nascent solar wind leading to extensive shear-driven dynamics, strong turbulent fluctuations including switchbacks, and mixing layers that involve domains of approximate magnetic pressure balance. In this work we identify and analyze various aspects of such domains using data from the first five PSP solar encounters. The filling fraction of domains, a measure of Alfvénicity, varies from median values of 90% within 0.2 au to 38% outside 0.9 au, with strong fluctuations. We find an inverse association between the mean domain duration and plasma β. We examine whether the mean domain duration is also related to the crossing time of spatial structures frozen into the solar wind flow for extreme cases of the aspect ratio. Our results are inconsistent with long, thin domains aligned along the radial or Parker spiral direction, and compatible with isotropic domains, which is consistent with prior observations of isotropic density fluctuations or flocculae in the solar wind.
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Kim, UiJong, and ChangGoo Heo. "The Influence of Worker’s Work-Life Balance on Family, Organization and Individual." Korean Journal of Industrial and Organizational Psychology 33, no. 3 (August 31, 2020): 267–96. http://dx.doi.org/10.24230/kjiop.v33i3.267-296.
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This study divided work-life balance into multidimensional balance(work-family, work-growth, work-leisure) and analyzed the effects of multidimensional work-life balances on family domain (family relation, family burnout), organizational domain (innovative work behavior, job efficacy reduction), and personal domain (psychological well-being, job strain) criterions. The main results and meanings of this study are as follows: First, it is more valid to interpret the balance of work-life as multidimensional factor structure (home, growth, leisure) than to interpret one-dimensionally. Second, the explanation of three factors (home, growth, and leisure) compared to one factor of work-life balance showed incremental explanation in variables such as family exhaustion, job efficacy reduction, psychological well-being, and innovative work behavior. In particular, work-growth balance among the three factors explained more than 15% of innovative work activities than one factor. Third, the discriminatory relationship between various life domains and multidimensional balance was observed in the relationship between home domain and work-family balance, organizational domain and work-growth balance, but did not appear in the relationship between individual domain and work-leisure balance. The results of this study are significant in that it provides basic data suggesting that multidimensional support is needed for work-life balance by showing that workers' work-life balance can be divided into various dimensions and that work-life balance has unique influence on each dimension. Finally, the limitations of this study and suggestions for future research are discussed that it is necessary to conduct a study on the moderating effect of individual differences in the relationship between work-life balance and various areas of life, and a study on the mediating effect including the determinants of work-life balance.
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COLOMBO, Rinaldo M., and Elena ROSSI. "Rigorous estimates on balance laws in bounded domains." Acta Mathematica Scientia 35, no. 4 (July 2015): 906–44. http://dx.doi.org/10.1016/s0252-9602(15)30028-x.
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Nath, Swaprava, and Tuomas Sandholm. "Efficiency and budget balance in general quasi-linear domains." Games and Economic Behavior 113 (January 2019): 673–93. http://dx.doi.org/10.1016/j.geb.2018.11.010.
Full textDissertations / Theses on the topic "Balance domains"
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Jia, Yonglin. "Shed Light on Leadership with Metaphor : How Chinese Leaders Integrate Themselves to Lead Better and even Lead beyond Domains." Thesis, Linnéuniversitetet, Institutionen för organisation och entreprenörskap (OE), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-43625.
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Leadership has been studied from many angles. But in my study, I study leadership with metaphors, hoping to provide some new insights. With metaphors, I want to seek an answer what can leaders do to integrate themselves to lead better. In this time, leadership is no longer constrained within one domain. With rapid changes and merging among companies and industries, people expect leadership in a broader range of contexts and domains. I also want to find what leaders can do to manage their influence well, to get it across domains. I look into various fields including psychology, culture, leadership and others to gain knowledge. With the help of metaphor, I break the questions into answerable parts and start my research. As for methodology, I adopt systems approach. I conduct eight interviews with leaders from diversified backgrounds regarding age, gender, industry, position and family status. But one thing in common is that they are all highly engaged in multi-cultural or multi-domain interaction. By studying their experience, learning their past and their approach, I come up with eight patterns of influence from the interviews, showing their uniqueness in style and approach to integrate themselves and to convey influence beyond domains. In theoretical study, I further compare the patterns to locate the common parts and reveal the different parts. Then I introduce a concise frame and analyze further. Finally, by combining books, articles and analysis, I provide the advice on what leader can do to expand their influence. Finally, I suggest a few points for leaders to integrate themselves to be better leaders and seek their styles. Then, using their styles or patterns, develop and deliver their influence beyond domains.
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Georgescu, Paula Raluca [Verfasser], and Andreas [Akademischer Betreuer] Ladurner. "H3K36-dependent anchoring of the KAT Mst2C is required to maintain the balance between euchromatic and heterochromatic domains in S. pombe / Paula Raluca Georgescu ; Betreuer: Andreas Ladurner." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2020. http://d-nb.info/1226092276/34.
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Piskopakis, Andreas. "Time-domain and harmonic balance turbulent Navier-Stokes analysis of oscillating foil aerodynamics." Thesis, University of Glasgow, 2014. http://theses.gla.ac.uk/5604/.
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The underlying thread of the research work presented in this thesis is the development of a robust, accurate and computationally efficient general-purpose Reynolds-Averaged Navier-Stokes code for the analysis of complex turbulent flow unsteady aerodynamics, ranging from low-speed applications such as hydrokinetic and wind turbine flows to high-speed applications such as vibrating transonic wings. The main novel algorithmic contribution of this work is the successful development of a fully-coupled multigrid solution method of the Reynolds-Averaged Navier-Stokes equations and the two-equation shear stress transport turbulence model of Menter. The new approach, which also includes the implementation of a high-order restriction operator and an effective limiter of the prolonged corrections, is implemented and successfully demonstrated in the existing steady, time-domain and harmonic balance solvers of a compressible Navier-Stokes research code. The harmonic balance solution of the Navier-Stokes equations is a fairly new technology which can substantially reduce the run-time required to compute nonlinear periodic flow fields with respect to the conventional time-domain approach. The thesis also features the investigation of one modelling and one numerical aspect often overlooked or not comprehensively analysed in turbulent computational fluid dynamics simulations of the type discussed in the thesis. The modelling aspect is the sensitivity of the turbulent flow solution to the, to a certain extent, arbitrary value of the scaling factor appearing in the solid wall boundary condition of the second turbulent variable of the Shear Stress Transport turbulence model. The results reported herein highlight that the solution variability associated with the typical choices of such a scaling factor can be similar or higher than the solution variability caused by the choices of different turbulence models. The numerical aspect is the sensitivity of the turbulent flow solution to the order of the discretisation of the turbulence model equations. The results reported herein highlight that the existence of significant solution differences between first and second order space-discretisation of the turbulence equations vary with the flow regime (e.g. fully subsonic or transonic), operating conditions that may or may not result in flow separation (e.g. angle of attack), and also the grid refinement. The newly developed turbulent flow capabilities are validated by considering a wide range of test cases with flow regime varying from low-speed subsonic to transonic. The solutions of the research code are compared with experimental data, theoretical solutions and also numerical solutions obtained with a state-of-the-art time-domain commercial code. The main computational results of this research regard a low-speed renewable energy application and an aeronautical engineering application. The former application is a thorough comparative analysis of a hydrokinetic turbine working in a low-speed laminar and a high-Reynolds number turbulent regime. The time-domain results obtained with the newly developed turbulent code are used to analyse and discusses in great detail the unsteady aerodynamic phenomena occurring in both regimes. The main motivation for analysing this problem is both to highlight the predictive capabilities and the numerical robustness of the developed turbulent time-domain flow solver for complex realistic problems, and to shed more light on the complex physics of this emerging renewable energy device. The latter application is the time-domain and harmonic balance turbulent flow analysis of a transonic wing section animated by pitching motion. The main motivation of these analyses is to assess the computational benefits achievable by using the harmonic balance solution of the Reynolds-Averaged Navier-Stokes and Shear Stress Transport equations rather than the conventional time-domain solution, and also to further demonstrate the predictive capabilities of the developed Computational Fluid Dynamics system. To this aim, the numerical solutions of this research code are compared to both available experimental data, and the time-domain results computed by a state-of-the-art commercial package regularly used by the industry and the Academia worldwide.
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Aikio, J. P. (Janne P. ). "Frequency domain model fitting and Volterra analysis implemented on top of harmonic balance simulation." Doctoral thesis, University of Oulu, 2007. http://urn.fi/urn:isbn:9789514284205.
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Abstract
The modern wireless communication techniques are aiming on increasing bandwidth and the number of carriers for higher data rate. This sets challenging linearity requirements for RF power amplifiers (PAs). Unfortunately, high linearity can only be obtained at the cost of efficiency. In order to improve the performance of the PA, in-depth understanding of nonlinear behaviour is mandatory. This calls for techniques that can give componentwise information of the causes of the distortion. The aim of this thesis is to develop a technique that can provide such information.
This thesis proposes a detailed distortion analysis technique that is based on frequency domain fitting of polynomial models. Simulated large-signal spectra are used for fitting as these contain the necessary information about the large-signal bias point and amplitude range. Moreover, in the frequency domain the delays are easy to compensate, and detailed analysis to any fitted tone can be performed. The fitting procedure as such is simple but becomes difficult in multi-dimensional nonlinearities if the controlling voltages correlate strongly. In this thesis the solvability and reliability of the fitting procedure is increased by numerical operations, model-degree reduction and by using different excitations.
A simplified Volterra method is used to calculate the distortion contributions by using the fitted model. The overall distortion is analysed by calculating the voltage response of the contributions of each nonlinearity to the terminal nodes of the device by the use of linear transfer functions of the circuit. The componentwise analysis is performed by phasor presentation enabling the cancelling mechanisms to be seen.
The proposed technique is implemented on top of harmonic balance simulation in an APLAC circuit simulator in which extensive distortion simulations are performed. The technique relies on the existing device model and thus the fitted model can be only as accurate as the particular simulation model. However, two different RF PAs are analysed that show a good agreement between measurements and simulations.
The proposed technique is verified with several test cases including amplitude dependent amplitude and phase distortion, intermodulation distortion sweet spots, bandwidth dependent memory effects and impedance optimization. The main finding of the detailed analysis is that the distortion is a result of several cancelling mechanisms. In general, cubic nonlinearity of transconductance is dominating the in-band distortion but is cancelled by the 2nd-degree nonlinearity that is mixed to the fundamental band from envelope and 2nd harmonic bands that is usually the main cause of memory effects.
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Chen, Yang. "Modeling, Control, and Design Study of Balanced Pneumatic Suspension for Improved Roll Stability in Heavy Trucks." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/95168.
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This research investigates a novel arrangement to pneumatic suspensions that are commonly used in heavy trucks, toward providing a dynamically balanced system that resists body roll and provides added roll stability to the vehicle. The new suspension, referred to as "balanced suspension," is implemented by retrofitting a conventional pneumatic suspension with two leveling valves and a symmetric plumbing arrangement to provide a balanced airflow and air pressure in the airsprings. This new design contributes to a balanced force distribution among the axles, which enables the suspension to maintain the body in a leveled position both statically and dynamically. This is in contrast to conventional heavy truck pneumatic suspensions that are mainly adjusted quasi-statically to level the body in response to load variations. The main objectives of the research are to discover and analyze the effects of various pneumatic components on the suspension dynamic response and numerically study the benefits of the pneumatically balanced suspension system. A pneumatic suspension model is established to capture the details of airsprings, leveling valves, check valves, pipes, and air tank based on the laws of fluid mechanics and thermodynamics. Experiments are designed and conducted to help determine and verify the modeling parameters and components. Co-simulation technique is applied to establish a multi-domain model that couples highly non-linear fluid dynamics of the pneumatic suspension with complex multi-body dynamics of an articulated vehicle. The model is used to extensively study effects of pneumatic balanced control of the suspensions on the tractor and trailer combination dynamics. The simulations indicate that the dual leveling valve arrangement of the balanced suspension provides better adjustments to the body roll by charging the airsprings on the jounce side, while purging air from the rebound side. Such an adjustment allows maintaining a larger difference in suspension force from side to side, which resists the vehicle sway and levels the truck body during cornering. Additionally, the balanced suspension better equalizes the front and rear drive axle air pressures, for a better dynamic load sharing and pitch control. It is evident from the simulation results that the balanced suspension increases roll stiffness without affecting vertical stiffness, and thereby it can serve as an anti-roll bar that results in a more stable body roll during steering maneuvers. Moreover, the Failure Mode and Effects Analysis (FMEA) study suggests that when one side of the balanced suspension fails, the other side acts to compensate for the failure. On the other hand, if the trailer is also equipped with dual leveling valves, such an arrangement will bring an additional stabilizing effect to the vehicle in case of the tractor suspension failure. The overall research results presented show that significant improvements on vehicle roll dynamics and suspension dynamic responsiveness can be achieved from the balanced suspension system.PHD
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Salazar, Niño Elvis. "The Mining Concession and the Right of Exploitation Seeking a Balance between the Public and the Private." Derecho & Sociedad, 2015. http://repositorio.pucp.edu.pe/index/handle/123456789/118164.
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The author introduces the regulatory and political landscape of the mining concession and the institutional decay it has suffered. He also shows the systems of acreage and the system which our country has received it well: the System of Public Domain. Finally, the author analyzes the mining concession and harvesting rights, raised according to the Constitution and the General Mining Law, explaining the policy changes needed to strengthen it as a fundamental qualifying title for the development of mining activities in the country.El autor presenta un panorama normativo y político de la concesión minera y el desgaste institucional que ha sufrido. Asimismo, expone los sistemas de dominio minero y el que nuestro país ha acogido con acierto: el Sistema Dominalista. Por último, analiza la concesión minera y el derecho de aprovechamiento, planteado de acuerdo a la Constitución y Ley General de Minería, explicando los cambios normativos necesarios a fin de fortalecerlo como título habilitante fundamental para el desarrollo de las actividades mineras del país.
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Yan, Minghan. "Time-domain and harmonic balance turbulent Navier-Stokes analysis of wind turbine aerodynamics using a fully coupled low-speed preconditioned multigrid solver." Thesis, Lancaster University, 2015. http://eprints.lancs.ac.uk/76968/.
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The research work reported in this thesis stems from the development of an accurate and computationally efficient Reynolds-Averaged Navier-Stokes (RANS) research code, with a particular emphasis on the steady and unsteady aerodynamics analysis of complex low speed turbulent flows. Such turbulent flow problems include horizontal axis wind turbine (HAWT) and vertical axis wind turbine (VAWT) operating at design and off-design conditions. On the algorithmic side, the main contribution of this research is the successful development of a rigorous novel approach to low-speed preconditioning (LSP) for the multigrid fully coupled integration of the steady, time-domain and harmonic balance RANS equations coupled to the two-equation shear stress transport (SST) turbulence model. The design of the LSP implementation is such that each part of the code affected by LSP can be validated individually against the baseline solver by suitably specifying one numerical input parameter of the LSP-enhanced code. The thesis has investigated several important issues on modelling and numerical aspects which are seldom thoroughly analysed in the computational fluid dynamics problems of the type presented herein. The first and most important modelling issue is the necessity of applying the low speed preconditioning to both RANS and SST equations and maintaining the turbulent kinetic energy in the definition of the total energy, which, to the best knowledge of author, has never been seen in any published literature so far. Based on the results obtained in the analysis of the vertical axis wind turbine application, we have demonstrated that by preconditioning the SST turbulence equations, one can significantly improve the convergence rate; and keeping the turbulence kinetic energy in the total energy has a great positive effect on the solution accuracy. The other modelling issue to be analysed is the sensitivity of the flow solution to the farfield boundary conditions, particularly for low speed problems. The analyses reported in the thesis highlight that with a small size of the computational domain, the preconditioned farfield boundary conditions are crucial to improve the solution accuracy. As for the numerical aspects, we analyse the impact of using the relative velocity to build the preconditioning parameter on the flow solutions of an unsteady moving-grid problem. The presented results demonstrate that taking into account the grid motion in building the preconditioning parameter can achieve a noticeable enhancement of the solution accuracy. On the other hand, the nonlinear frequency-domain harmonic balance approach is a fairly new technology to solve the unsteady RANS equations, which yields significant reduction of the run-time required to achieve periodic flows with respect to the conventional time-domain approach. And the implementation of the LSP approach into the turbulent harmonic balance RANS and SST formulations is another main novelty presented herein, which is also the first published research work on this aspect. The newly developed low speed turbulent flow predictive capabilities are comprehensively validated in a wide range of tests varying from subsonic flow with slight compressibility to user-defined extremely low speed incompressible flows. The solutions of our research code with LSP technology are compared with experiment data, theoretical solutions and numerical solutions of the state-of-the-art CFD research code and commercial package. The main computational results of this research consist of the analyses of HAWT and VAWT applications. The first one is a comparative analysis of 30% and 93.5% blade sections of a VESTAS multi-megawatt HAWT working in various regimes. The steady, time-domain and frequency-domain results obtained with the LSP solver are used to analyse in great detail the steady and unsteady aerodynamic characteristics in those regimes. The main motivation is to highlight the predictive capabilities and the numerical robustness of the LSP-enhanced turbulent steady, time-domain and frequency domain flow solvers for realistic complex and even more challenging problems, to quantify the effects of flow compressibility on the steady and yawed wind-induced unsteady aerodynamics in the tip region of a 82-m HAWT blade in rated operating condition, and to assess the computational benefits achieved by using the harmonic balance method rather than the conventional time-domain method. The second application is the comparative aerodynamic analyses of the NREL 5MW HAWT working in the inviscid steady flow condition. The main motivation of this analysis is to further demonstrate the predictive capabilities of the LSP solver to simulate the threedimensional wind turbine flows. The last application is the time-domain turbulent flow analysis of the VAWT to the aim of demonstrating the accuracy enhancement of the LSP solver for this particular problem, the necessity of applying the full preconditioning strategy, the important effect of the turbulent kinetic energy on the solution accuracy and the proper implementation of the preconditioning parameter required for an accurate numerical solution to an unsteady moving grid low-speed problem.
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Williamson, Masen J. "Thucydides' Plague, a Narrative Aggressor." BYU ScholarsArchive, 2021. https://scholarsarchive.byu.edu/etd/8884.
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This thesis expands upon the notion that Thucydides’ plague narrative in his History of the Peloponnesian War punctuates his argument for the unique greatness of the Peloponnesian War. Through the plague, Thucydides displays the collapse of Greek society’s standards and practices. He does this by describing a plague which does not conform to 5th century BCE Greek medical ideas. Balance, human art, and divine intervention all fail in their attempts to restore the health of the individual and society. Thucydides portrays the plague as a narrative aggressor whose intent is to topple Athens and its ideals. Lucretius’ plague narrative, because it narrates the same historical moment but from a different perspective, is then discussed in order to demonstrate how other authors have used Thucydides’ technique.
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George, Brendan Hugh. "Comparison of techniques for measuring the water content of soil and other porous media." University of Sydney, 1999. http://hdl.handle.net/2123/491.
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The measurement of water in soil on a potential, gravimetric or volumetric basis is considered, with studies concentrating on the measurement of water by dielectric and neutron moderation methods. The ability of the time-domain reflectometry technique to measure water content simultaneously at different spatial locations is an important advantage of the technique. The reported apparent dielectric by the TRASE� time-domain reflectometer and Pyelab time-domain reflectometry systems is sensitive to change in extension cable length. In some soil, e.g. a commercial sand, the response to increasing extension length of extension cable is linear. For other soil a linear response occurs for certain lengths of cable at different moisture contents. A single model accounting for clay content, extension cable length, time-domain reflectometry system, probe type and inherent moisture conditions explained 62.2 % of variation from the control (0 m extension) cable. The extension cable causes a decrease in the returning electromagnetic-wave energy; leading to a decline in the slope used in automatic end-point determination. Calibration for each probe installation when the soil is saturated, and at small water contents is recommended. The ability of time-domain reflectometry, frequency-domain and neutron moderation techniques in measuring soil water content in a Brown Chromosol is examined. An in situ calibration, across a limited range of water contents, for the neutron moderation method is more sensitive to changing soil water content than the factory supplied 'universal' calibration. Comparison of the EnviroSCAN� frequency-domain system and the NMM count ratio indicates the frequency-domain technique is more sensitive to change in soil water conditions. The EnviroSCAN� system is well suited to continuous profile-based measurement of soil water content. Results with the time-domain reflectometry technique were disappointing, indicating the limited applicability of time-domain reflectometry in profile based soil water content measurement in heavy-textured soil, or soil with a large electrical conductivity. The method of auguring to a known depth and placement of the time-domain reflectometry probe into undisturbed soil is not recommended. A time-domain reflectometry system is adapted for in situ measurement of water in an iron ore stockpile. The laboratory calibration for water content of the processed iron ore compares favourably to a field calibration. In the field study, the 28 m extension cable used to connect the probes to the time-domain reflectometry affected the end-point determination of the time-domain reflectometry system. To account for this, 0.197 should be subtracted from the reported apparent dielectric before calculation of volumetric moisture content.
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Gorsuch, Jenna L. "The Effects of Control and Work/Family Centrality on the Personal Use of Work Computers." Cleveland State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=csu1397838982.
Full textBooks on the topic "Balance domains"
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Ulich, Eberhard, and Bettina S. Wiese. Life Domain Balance. Wiesbaden: Gabler Verlag, 2011. http://dx.doi.org/10.1007/978-3-8349-6489-2.
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V, García Quintela Marco, and Colloque international d'anthropologie du monde indo-européen et de mythologie comparée (6th : 2006 : Casa de Velásquez), eds. Vingt ans après Georges Dumézil (1898-1986): Mythologie comparée indo-européenne et idéologie trifonctionelle : bilans, perspectives et nouveau domaines : VIe colloque international d'anthropologie du monde indo-européen et de mythologie comparée, Casa de Velázquez, Madrid, 27-28 novembre 2006 = Veinte años después de Georges Dumézil (1898-1986) : mitología comparada indoeuropea e ideología trifuncional : balance, perspectivas y nuevos campos : VI Coloquio Internacional de Antropologia del Mundo Indoeuropeo y de Mitología Comparada, Casa de Velázquez, Madrid, 27-28 de noviembre de 2006. Budapest: Archaeolingua, 2009.
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Mills, Maura J. Gender and the Work-Family Experience: An Intersection of Two Domains. Springer, 2016.
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Mills, Maura J. Gender and the Work-Family Experience: An Intersection of Two Domains. Springer, 2014.
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Mills, Maura J. Gender and the Work-Family Experience: An Intersection of Two Domains. Springer, 2014.
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Fuson, Karen C., Aki Murata, and Dor Abrahamson. Using Learning Path Research to Balance Mathematics Education. Edited by Roi Cohen Kadosh and Ann Dowker. Oxford University Press, 2014. http://dx.doi.org/10.1093/oxfordhb/9780199642342.013.003.
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This chapter is an overview of central research-based perspectives that support teaching-learning for understanding and for fluency. We summarize the Class Learning Path Model that integrates two theoretical foci – a Piagetian focus on learning and a Vygotskiian focus on teaching – and specifies phases in learning that reflect Vygotsky’s assertion about the move from spontaneous to scientific concepts. Major aspects of the model were drawn from national research-based reports. This model connects understanding and fluency with a focus on mathematically important but also accessible methods in the middle and on maths drawings and other supports for understanding these methods. Such methods can be generated by students and can bridge from less-advanced student methods to formal methods that are unnecessarily complex. For three maths domains in Grades Kindergarten through Grade 6, we illustrate and discuss methods in the middle and drawings (diagrams) that support these methods: problem solving and especially the full range of word problem situations with each quantity the unknown; multidigit addition, subtraction, multiplication, and division; and ratio and proportion. Central features of the Common Core State Standards Mathematical Practices (CCSSO/NGA 2010) in these domains are identified, and how these can support understanding and fluency are briefly discussed. Further aspects of how the pedagogical supports help students move through the Class Learning Path in their own individual ways, and implications for research and for designing maths programmes are then discussed.
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Fuertes, Jairo N., Arnold Spokane, and Elizabeth Holloway. Specialty Competencies in Counseling Psychology. Oxford University Press, 2015. http://dx.doi.org/10.1093/med:psych/9780195386448.001.0001.
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This online resource provides a striking balance of the rich history of the counseling specialty and a thorough articulation of the professional practice domains conducted by the counseling psychology specialist. It delivers informative examples of each foundational and functional domain of competency as well as a comprehensive discussion of the historic roots that support the specialty's leadership role in professional psychology. It successfully captures how counseling psychology interfaces and overlaps with the other psychology specialties, yet also distinguishes itself from them.
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Khan, Bilal, Mitch Downey, Meredith Dank, and Kirk Dombrowski. A Method for Determining the Size of the Underground Cash Economy for Commercial Sex in Seven US Cities. Edited by Scott Cunningham and Manisha Shah. Oxford University Press, 2016. http://dx.doi.org/10.1093/oxfordhb/9780199915248.013.12.
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This chapter describes a new method for determining the size of the underground cash economy for commercial sex in seven major US cities: Atlanta, Dallas, Denver, Miami, San Diego, Seattle, and Washington, DC. In this innovative methodology, the operating assumption of the process is that estimates of the size of various domains of the underground economy are more accurate when comparative data across time and different locations are taken into account and when estimates of the size of one domain of the underground economy are forced to balance estimates of other domains in the underground economy with which they coincide. This method is used to derive a more rigorous estimate of the underground commercial sex economy and shed more light on its structure. To estimate its size accurately, simultaneous estimates are obtained for the size of the cash-based trade in illegal drugs and illegal firearms in each city.
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Grzywacz, Joseph G., Abdallah M. Badahdah, and d. Azza O. Abdelmoneium. Work Family Balance: Challenges, Experiences, and Implications for Families. 2nd ed. Hamad Bin Khalifa University Press, 2019. http://dx.doi.org/10.5339/difi_9789927137952.
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A key objective of the study of work-family balance detailed in this report was to build an evidence base to inform policy creation or refinement targeting work-family balance and related implementation standards to ensure the protection and preservation of Qatari families. Two complementary projects were designed and implemented to achieve this key objective. The first project was a qualitative study involving in-depth interviews with 20 Qatari working adults (10 males and 10 females). The interviews were designed to learn the meaning of work-family balance among Qataris, identify the factors shaping work-family balance or the lack thereof, and collect firsthand detailed information on the use and value of policy-relevant work-family balance sup - ports for working Qataris. The second component was a survey designed to describe work-family balance among working Qatari adults, determine potential health and well-being consequences of poor work-family balance, and characterize Qataris’ use of and preferences for new work-family balance supports. The data from the qualitative interviews tell a very clear story of work-family balance among Qataris. Work-family balance is primarily viewed as working adults’ ability to meet responsibilities in both the work and family domains. Although work-fam - ily balance was valued and sought after, participants viewed work-family balance as an idyllic goal that is unattainable. Indeed, when individuals were asked about the last time they experienced balance, the most common response was “during my last vacation or extended holiday.” The challenge of achieving work-family balance was equally shared by males and females, although the challenge was heightened for females. Qataris recognized that “work” was essential to securing or providing a desirable family life; that is, work provided the financial wherewithal to obtain the features and comforts of contemporary family life in Qatar. However, the cost of this financial wherewithal was work hours and a psychological toll characterized as “long” and “exhausting” which left workers with insufficient time and energy for the family. Participants commented on the absolute necessity of paid maternity leave for work-family balance, and suggested it be expanded. Participants also discussed the importance of high-quality childcare, and the need for greater flexibility for attending to family responsibilities during the working day. Data from the quantitative national survey reinforce the results from the qualitative interviews. Work-family balance is a challenge for most working adults: if work-fam - ily balance were given scores like academic grades in school, the majority of both males and females would earn a "C" or lower (average, minimal pass or failure). As intimated in the qualitative data, working females’ work-family balance is statistically poorer than that of males. Poor work-family balance is associated with poorer physical and mental health, with particularly strong negative associations with depression. It appears the Human Resource Law of 2016 was effective in raising awareness of and access to paid maternity leave. However, a substantial minority of working Qataris lack access to work-family balance supports from their employer, and the supports that are provided by employers do not meet the expectations of the average Qatari worker.
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Ulich, Eberhard, and Bettina S. Wiese. Life Domain Balance: Konzepte Zur Verbesserung der Lebensqualität. Westdeutscher Verlag GmbH, 2011.
Find full textBook chapters on the topic "Balance domains"
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Gosse, Laurent. "Material Variables, Strings and Infinite Domains." In Computing Qualitatively Correct Approximations of Balance Laws, 117–34. Milano: Springer Milan, 2013. http://dx.doi.org/10.1007/978-88-470-2892-0_7.
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Schüttengruber, Victoria, Franciska Krings, and Alexandra M. Freund. "Positive and Negative Spillover Effects: Managing Multiple Goals in Middle Adulthood." In Withstanding Vulnerability throughout Adult Life, 31–47. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-4567-0_3.
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AbstractBoth in the research literature as well as in popular media, the topic of “work-life” balance receives much attention, particularly for the age group of middle-aged adults. There is evidence for both, positive and negative spillover effects across life domains. This chapter provides a theoretical and empirical overview of the different types of inter-domain relationships, concepts of boundary management, and models of spillover effects on health and well-being. Adopting a lifespan perspective, we review the literature on spillover effects by focusing on multiple goal pursuit in the life domains of work, family, and leisure in middle adulthood. During this “rush hour” of life, middle-aged adults face the challenge of managing their scarce resources (e.g., time, energy) in order to achieve a successful “work-life balance.” Accordingly, we present empirical studies addressing the interplay between goal pursuit, boundary management, inter-domain conflict and facilitation, as well as spill- and crossover effects at the work-family interface. In addition, this chapter considers both exhaustion and recovery as key outcomes of spillover effects across life domains and highlights recommendations for boundary management in middle adulthood. Finally, this chapter outlines promising routes for future research on spillover effects between work, family, and leisure.
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Lothaller, Harald. "On the Way to Life-Domains Balance: Success Factors and Obstacles." In A Young Generation Under Pressure?, 109–28. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03483-1_6.
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Zhuang, Yujian, Xiaoyi Zhou, and Sheng Liu. "Balance the Robustness and Invisibility of Digital Watermarking by Image Entropy in Multiple Domains." In 3D Imaging Technologies—Multi-dimensional Signal Processing and Deep Learning, 129–35. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-3391-1_15.
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Ulich, Eberhard, and Bettina S. Wiese. "Einführung." In Life Domain Balance, 13–18. Wiesbaden: Gabler Verlag, 2011. http://dx.doi.org/10.1007/978-3-8349-6489-2_1.
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Ulich, Eberhard, and Bettina S. Wiese. "Betriebsspezifische Maßnahmen." In Life Domain Balance, 215–30. Wiesbaden: Gabler Verlag, 2011. http://dx.doi.org/10.1007/978-3-8349-6489-2_10.
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Ulich, Eberhard, and Bettina S. Wiese. "Corporate Social Responsibility und weiter reichende Initiativen." In Life Domain Balance, 231–56. Wiesbaden: Gabler Verlag, 2011. http://dx.doi.org/10.1007/978-3-8349-6489-2_11.
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Ulich, Eberhard, and Bettina S. Wiese. "Lessons learned." In Life Domain Balance, 257–62. Wiesbaden: Gabler Verlag, 2011. http://dx.doi.org/10.1007/978-3-8349-6489-2_12.
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Ulich, Eberhard, and Bettina S. Wiese. "Vom Work Life Balance Konzept zum Life Domain Balance Konzept." In Life Domain Balance, 19–58. Wiesbaden: Gabler Verlag, 2011. http://dx.doi.org/10.1007/978-3-8349-6489-2_2.
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Ulich, Eberhard, and Bettina S. Wiese. "Prekäre Arbeitsverhältnisse." In Life Domain Balance, 59–81. Wiesbaden: Gabler Verlag, 2011. http://dx.doi.org/10.1007/978-3-8349-6489-2_3.
Full textConference papers on the topic "Balance domains"
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Junge, Laura, Christian Frey, Graham Ashcroft, and Edmund Kügeler. "A New Harmonic Balance Approach Using Multidimensional Time." In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-16224.
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Abstract Over the past years, nonlinear frequency-domain methods have become a state-of-the-art technique for the numerical simulation of unsteady flow fields within multistage turbomachinery as they are capable of fully exploiting the given spatial and temporal periodicities, as well as modelling flow nonlinearities in a computationally efficient manner. Despite this success, it still remains a significant challenge to capture nonlinear interaction effects within the context of configurations with multiple fundamental frequencies. If all frequencies are integer multiples of a common fundamental frequency, the interval spanned by the sampling points typically resolves the period of the common base frequency. For configurations in which the common frequency is very low in relation to the frequencies of primary interest, many sampling points are required to resolve the highest harmonic of the common fundamental frequency and the method becomes inefficient. In addition when a problem can no longer be described by harmonic perturbations that are integer multiples of one fundamental frequency, as it may occur in two-shaft configurations or when simulating the nonlinear interaction in the context of forced response or flutter, then the standard discrete Fourier transform is no longer suitable and the basic harmonic balance method requires extension. One possible approach is to use almost periodic Fourier transforms with equidistant or non-equidistant time sampling. However, the definition of suitable sampling points that lead to well-conditioned Fourier transform matrices and small aliasing errors is an intricate issue and far from straightforward. To overcome the issues regarding multi-frequency problems described above, a new harmonic balance approach based on multidimensional Fourier transforms in time is presented. The basic idea of the approach is that, instead of defining common sampling points in a common time period, separate time domains, one for each base frequency, are spanned and the sampling points are computed equidistantly within each base frequency’s period. Since the sampling domain is now extended to a multidimensional time-domain, all time instant combinations covering the whole multidimensional domain are computed as the Cartesian product of the sampling points on the axes. In a similar fashion the frequency-domain is extended to a multidimensional frequency-domain by the Cartesian product of the harmonics of each base frequency, so that every point defined by the Cartesian product is an integer linear combination of the occurring frequencies. In this way the proposed method is capable of fully integrating the nonlinear coupling effects between higher harmonics of different fundamental frequencies by using multidimensional discrete Fourier transforms within the harmonic balance solution procedure. The aim of this paper is to introduce the multidimensional harmonic balance method in detail and demonstrate the capability of the approach to simultaneously capture unsteady disturbances with arbitrary excitation frequencies. Therefore the well established aeroelasticity testcase standard configuration 10 in the presence of an artificial inflow disturbance, that mimics an upstream blade wake, is investigated. The crucial aspect of the proposed testcase is that a small ratio of the frequency of the inflow disturbance and the blades vibration frequency is chosen. To demonstrate the advantages of the newly proposed multidimensional harmonic balance approach, the results are compared to unsteady simulations in the time-domain and to state-of-the-art frequency-domain methods based on one-dimensional discrete Fourier transforms.
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Belardinelli, Pierpaolo, and Stefano Lenci. "HPC Methods for Domains of Attraction Computation." In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-46095.
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The work is devoted to the development of efficient parallel algorithms for the computation of large-scale basins of attraction. Since the required computational resources increase exponentially with the dimension of a dynamical system, it is common to get into memory saturation or in a secular elaboration time. This paper presents a code, based on a cell mapping method, that evaluates basins of attraction for high-dimensional systems by exploiting the parallel programming. The proposed approach, by using a double-step algorithm, permits, i) to fully determine the basins in all the dimensions ii) to evaluate 2D Poincaré sections of the system. The code is described in all its parts: the shell, in charge of the core management, permits to split over a multi-core environment the computing domain, it carries out an efficient use of the memory. A preliminary analysis of the performances is undertaken also by considering different dimensional grids; the optimal balance between computing cores and memory management cores is studied.
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Ruparel, Tejas, Azim Eskandarian, and James Lee. "Concurrent Multiple-Time-Scale Simulations With Improved Numerical Dissipation for Structural Dynamics." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-64642.
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Work presented in this paper describes the formulation for implementation of a concurrent multiple-time-scale integration method with improved numerical dissipation capabilities. This approach generalizes the previous Multiple Grid and Multiple Time-Scale (MGMT) Method [1] implemented for the Newmark family of algorithms. The framework is largely based upon the fundamental principles of Lagrange multipliers used to enforce workless nonholonomic constraints and Domain Decomposition Methods (DDM) to obtain coupled equations of motion for distinct regions of a continuous domain. These methods when combined together systematically yield constraint forces that not only ensure conservation of energy but also enforce continuity of velocities across the interfaces. Multiple grid connections between (non-conforming) sub-domains are handled using Mortar elements whereas coupled multiple-time-scale equations are derived for the Generalized-α Method [2]. We show that MGMT Method can be easily extended to incorporate the Generalized-α family of time integration algorithms, hence allowing selective discretization in space and time along with controlled numerical dissipation for distinct grids. We also show that interface energy across connecting sub-domains is identically zero, further assuring global energy balance and continuity of velocities across connecting sub-domains.
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Laxalde, Denis, and Fabrice Thouverez. "Non-Linear Vibrations of Multi-Stage Bladed Disks Systems With Friction Ring Dampers." In ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-34473.
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In this paper, we study the non-linear dynamics of a multi-stage system of turbomachinery bladed disks with friction dampers. We focus on the quasi-periodic forced response of this system under multi-frequency rotating excitations. The system’s equations of the motion are expressed in the multi-frequency domain using a multi-frequency harmonic balance method in combination a multi-stage cyclic symmetry reduction. A Dynamic Lagrangian formulation in alternating frequency/time domains is also used for the calculation of the contact and friction forces. In applications we consider a system of two HP compressor stages of integrally bladed disks with friction ring dampers.
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Chaplya, Pavel M., and Gregory P. Carman. "The Effect of Mechanical Prestress on Dielectric and Piezoelectric Response of PZT-5H at High Electric Fields." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-1722.
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Abstract The dielectric and piezoelectric response of PZT-5H ceramics at high electrical and mechanical loads is presented. The purpose of this study is to provide a detailed explanation of the effect of prestress on the induced polarization and strain. The material is electrically cycled (−2/+2 MV/m, 0/+2 MV/m, and −0.4/+2 MV/m) at constant mechanical prestress levels up to 175 MPa. A descriptive model is used to explain the results in terms of consecutive non-180° domain wall motion only. The response of the material depends on the non-180° domain wall motion produced by the balance between the applied electric field and prestress. The limitation of the model is that it neglects 0° and 180° domains contribution to the response of the actual material.
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Ruparel, Tejas, Azim Eskandarian, and James Lee. "Multiple Grid and Multiple Time-Scale (MGMT) Simulations in Continuum Mechanics." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-87651.
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The work presented in this paper describes a general formulation for implementation of Multiple Grid and Multiple Time-scale (MGMT) simulations in continuum mechanics. Using this method one can solve problems in structural dynamics in which the domain under consideration can be selectively discretized (spatially and temporally) in critical and remote regions, hence allowing the user to obtain a desired level of accuracy and save computational time. The formulation is based upon the fundamental principles of Domain Decomposition Methods (DDM) used to obtain the semi-discrete equation of motion for coupled sub-domains augmented with interface energy. Lagrange Multipliers, based on Schur’s dual formulation, are used to enforce interface conditions since they not only ensure energy balance but also enforce continuity of kinematic quantities across the interface. The Finite Element Tearing and Interconnecting (FETI) based Multi Time-step (MTS) coupling algorithm proposed by Prakash and Hjelmstad [1] is then used to obtain the evolution of unknown quantities in respective sub-domains using different time-steps and/or different variants of the Newmark Implicit Method. Our work is in the direction of coupling this MTS algorithm with multiple grid discretizations in respective subdomains. We propose using coarse grid discretization to define the mortar space between non-conforming sub-domains and show that this particular choice when combined with the implicit integration scheme yields a stable algorithm for MGMT simulations. The formulation is implemented, comprehensively, using Finite Element Methods and programming in FORTRAN 90. Several scenarios with different mesh densities and time-steps are evaluated to analyze the efficiency of MGMT simulations. The purpose of this paper is to study and evaluate its accuracy and stability by looking at evolution and distribution of quantities across the connecting interface. Results show that the interface coupling for non-conforming sub-domains with distinct integration time-steps can be efficiently modeled using this approach.
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Akyuzlu, K. M., A. Antoniou, and R. Kagoo. "The Effect of Radiation on Turbulent Convective Heat Transfer Over an Ablating Solid." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-1407.
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Abstract A numerical study is conducted to investigate the effect of thermal radiation on turbulent flow (upstream of the flame front) inside a subscale planar hybrid rocket motor. The physical model adopted for the study is based on an unsteady two-domain (solid fuel and gaseous oxidizer) concept where both domains are assumed to be two-dimensional. Furthermore, the oxidizer gas flow is assumed to be incompressible and turbulent with boundary layer approximations. The radiative heat transfer is incorporated to the energy equation for the oxidizer using the Rosseland diffusion approximation. Fuel is assumed to be a nontransparent isotropic solid. The two domains are coupled through an energy balance at the interface that includes heat transfer due to radiation, conduction, and ablation. The solution to the governing differential equations of the present model is obtained by first linearizing the equations using Newton linearization method, discretizing them by a fully implicit finite-difference technique, and then solving the resulting set of algebraic equations by a block tridiagonal matrix solver. Finally, the proposed mathematical model is used in a parametric study to determine the effect of various operational parameters, such as flame temperature and oxidizer mass flow rate, on heat transfer from the solid fuel. Results indicate the significance of radiation on turbulent convective heat transfer over an ablating solid.
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Huo, Wenhao, Jun Li, Jiandao Yang, Liqun Shi, and Zhenping Feng. "Numerical Investigations on the Cooling Performance of the Internal Bypass Cooling System of the Ultra-Supercritical Steam Turbines Using CFD and Conjugate Heat Transfer Method." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-94375.
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The cooling effect of the internal bypass cooling system in high pressure cylinder of an ultra-supercritical steam turbine using the conjugation of the flow calculation and heat transfer method was numerically studied in this paper. Three-dimensional Reynolds-Averaged Navier-Stokes (RANS) solutions and k–ε turbulent model with scalable wall function were used to analyze the cooling performance based on the CFD software ANSYS-CFX. The details of the flow pattern of the fluid domains and temperature distributions of the solid domains in the system were illustrated. The temperature field of the high pressure cylinder was compared between the steam cooling case and the non-cooling case without consideration of the steam cooling of the internal bypass cooling system. The main conclusion that can be drawn out of this research work is that the high pressure inner casing and the large part of axial thrust balance piston can be effectively cooled by the internal bypass cooling system. In addition, the resulting temperature distributions of the inner casing are uniformed compared to the non-cooling case. The temperature of the outer casing of the high pressure cylinder increases a little compared to the non-cooling case.
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Kavousi, Sepideh, and Dorel Moldovan. "Phase Field Modeling of Solidification in Single Component Systems." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-71921.
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Using phase field modeling simulation approach we investigate the effect of various parameters on the primary and secondary dendrite arm spacing during directional solidification in a single component system. In previous studies the effect of temperature gradient was assumed to be negligible in the transversal directions with a temperature rate equal to the product of thermal gradient and solidification rate. In our study the temperature field is obtained from energy conservation equation by considering the balance of latent heat released in the regions where solidification occurs and energy dissipation due to directional temperature gradient as boundary condition. In our simulations, we implemented a numerical method that enables the investigation of solidification in larger domains. Specifically, the temperature and the order parameter equations are solved only in the domains close to the solidification front; approach that reduces the computational costs significantly. We investigate the interplay and the effect of thermal gradient, solidification rate, undercooling temperature, and the cooling heat flux on arm spacing. By using a well-established power law relation the primary and secondary arm spacing are calculated for various solidification parameters. We also show that, for large heat fluxes, the secondary arm spacing is almost constant for different undercooling temperatures; behavior that demonstrates the need for correction of the power law relation by including the effect of heat flux.
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Frey, Christian, Daniel Schlüß, Nina Wolfrum, Patrick Bechlars, and Maximilian Beck. "On the Formulation of Nonreflecting Boundary Conditions for Turbomachinery Configurations: Part I — Theory and Implementation." In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-14684.
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Abstract With unsteady flow simulations of industrial turbomachinery configurations becoming more and more affordable there is a growing need for accurate inlet and outlet boundary conditions as numerical reflections alone can lead to incorrect trends in engine efficiency, noise and aeroelastic analysis parameters. This is the first of two papers on the formulation of unsteady boundary conditions which have been implemented for both time-domain and frequency-domain solvers. Giles’ original idea for steady solvers to formulate the boundary condition in terms of characteristics generalizes to frequency-domain solvers. The boundary condition drives the value of the incoming characteristics to ideal values that are computed using the modal decomposition of linearized 2D Euler flows. The present paper explains how to generalize 2D nonreflecting boundary conditions to real 3D annular domains by applying them in certain conical rotational surfaces. For a flow with zero radial component and an annular boundary that is perpendicular to the machine axis, these surfaces are the cylindrical streamsurfaces. For more general flows and geometries, however, there is no natural choice for the rotational surfaces. In this paper, two choices are discussed: the surfaces that are generated by the boundary normals and those that are defined by the circumferentially averaged meridional velocity. The impact of the boundary condition on the stability of the harmonic-balance solver is analyzed by studying the pseudo-time evolution of certain energy integrals. For a model problem which consists of a small disturbance of an inviscid flow, the increase or decrease of this energy integral is shown to be directly related to the normal characteristic variables along the boundary. This shows that the actual boundary condition should be formulated as a control problem for the normal characteristics. Moreover, the application of the harmonic balance solver to a simple duct configuration with prescribed disturbances demonstrates that using the characteristics based on the meridional velocity may prevent the solver from converging. In contrast, the 2D theory can be formulated in a different surface without impairing the robustness of the overall approach. These findings are illustrated by a simple test case. The impact of the choice of the rotational surface for the 2D theory is studied for various duct segments and a low-pressure turbine configuration in the second paper. There it is shown that applying the 2D theory to the meridional-velocity surfaces may be advantageous in that it leads to more accurate results.
Reports on the topic "Balance domains"
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FACHINELLI, ANA CRISTINA, TAN YIGITCANLAR, TATIANA TUCUNDUVA PHILIPPI CORTESE, JAMILE SABATINI MARQUES, DEBORA SOTTO, and BIANCA LIBARDI. SMART CITIES DO BRASIL: Performance of Brazilian Capital Cities. UCS - Universidade de Caxias do Sul, May 2022. http://dx.doi.org/10.18226/9786500438604.
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This report is an outcome of close collaboration between the Australia-Brazil Smart City Research and Practice Network's member institutions. The report focuses on understanding the smartness levels of the Brazilian capital cities through the lens of a smart city performance assessment framework. This report focuses on Brazilian cities to develop an evaluation model for smart cities and bring metrics that contribute to public managers seeking balance and smartness in the life of their cities. The smart city concept in this report concerns of smart economy, smart society, smart environment, smart governance, and smart technology domains that seek community-enabled technology and policy to deliver productivity, innovation, livability, well-being, sustainability, accessibility, and good governance and planning.
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Russell, H. A. J., and S. K. Frey. Canada One Water: integrated groundwater-surface-water-climate modelling for climate change adaptation. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/329092.
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Canada 1 Water is a 3-year governmental multi-department-private-sector-academic collaboration to model the groundwater-surface-water of Canada coupled with historic climate and climate scenario input. To address this challenge continental Canada has been allocated to one of 6 large watershed basins of approximately two million km2. The model domains are based on natural watershed boundaries and include approximately 1 million km2 of the United States. In year one (2020-2021) data assembly and validation of some 20 datasets (layers) is the focus of work along with conceptual model development. To support analysis of the entire water balance the modelling framework consists of three distinct components and modelling software. Land Surface modelling with the Community Land Model will support information needed for both the regional climate modelling using the Weather Research & Forecasting model (WRF), and input to HydroGeoSphere for groundwater-surface-water modelling. The inclusion of the transboundary watersheds will provide a first time assessment of water resources in this critical international domain. Modelling is also being integrated with Remote Sensing datasets, notably the Gravity Recovery and Climate Experiment (GRACE). GRACE supports regional scale watershed analysis of total water flux. GRACE along with terrestrial time-series data will serve provide validation datasets for model results to ensure that the final project outputs are representative and reliable. The project has an active engagement and collaborative effort underway to try and maximize the long-term benefit of the framework. Much of the supporting model datasets will be published under open access licence to support broad usage and integration.
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de Kemp, E. A., H. A. J. Russell, B. Brodaric, D. B. Snyder, M. J. Hillier, M. St-Onge, C. Harrison, et al. Initiating transformative geoscience practice at the Geological Survey of Canada: Canada in 3D. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/331097.
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Application of 3D technologies to the wide range of Geosciences knowledge domains is well underway. These have been operationalized in workflows of the hydrocarbon sector for a half-century, and now in mining for over two decades. In Geosciences, algorithms, structured workflows and data integration strategies can support compelling Earth models, however challenges remain to meet the standards of geological plausibility required for most geoscientific studies. There is also missing links in the institutional information infrastructure supporting operational multi-scale 3D data and model development. Canada in 3D (C3D) is a vision and road map for transforming the Geological Survey of Canada's (GSC) work practice by leveraging emerging 3D technologies. Primarily the transformation from 2D geological mapping, to a well-structured 3D modelling practice that is both data-driven and knowledge-driven. It is tempting to imagine that advanced 3D computational methods, coupled with Artificial Intelligence and Big Data tools will automate the bulk of this process. To effectively apply these methods there is a need, however, for data to be in a well-organized, classified, georeferenced (3D) format embedded with key information, such as spatial-temporal relations, and earth process knowledge. Another key challenge for C3D is the relative infancy of 3D geoscience technologies for geological inference and 3D modelling using sparse and heterogeneous regional geoscience information, while preserving the insights and expertise of geoscientists maintaining scientific integrity of digital products. In most geological surveys, there remains considerable educational and operational challenges to achieve this balance of digital automation and expert knowledge. Emerging from the last two decades of research are more efficient workflows, transitioning from cumbersome, explicit (manual) to reproducible implicit semi-automated methods. They are characterized by integrated and iterative, forward and reverse geophysical modelling, coupled with stratigraphic and structural approaches. The full impact of research and development with these 3D tools, geophysical-geological integration and simulation approaches is perhaps unpredictable, but the expectation is that they will produce predictive, instructive models of Canada's geology that will be used to educate, prioritize and influence sustainable policy for stewarding our natural resources. On the horizon are 3D geological modelling methods spanning the gulf between local and frontier or green-fields, as well as deep crustal characterization. These are key components of mineral systems understanding, integrated and coupled hydrological modelling and energy transition applications, e.g. carbon sequestration, in-situ hydrogen mining, and geothermal exploration. Presented are some case study examples at a range of scales from our efforts in C3D.
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Tull, Kerina. Economic Impact of Local Vaccine Manufacturing. Institute of Development Studies (IDS), February 2021. http://dx.doi.org/10.19088/k4d.2021.034.
Full textAbstract:
Over a period of time, a tier of mostly middle-income developing countries has developed a considerable pharmaceutical and vaccine production capacity. However, outcomes have not always been positive for domestic manufacturers in developing countries. Economic and health lessons learned from vaccine manufacturing in developing countries include challenges and positive spill-over effects. Evidence for this rapid review is taken from the south and southeast Asia (India, Indonesia, Thailand, Vietnam), and Latin America (Brazil, Cuba, Mexico). Although data on locally manufactured drugs on the balance of trade was available, this was not readily available for vaccine manufacturing. The evidence used in this review was taken from grey and academic literature, as well as interviews with economic specialists. Although market reports on vaccine production are available for most of these countries, their data is not in the public domain.
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Ashley, Caitlyn, Elizabeth Spencer Berthiaume, Philip Berzin, Rikki Blassingame, Stephanie Bradley Fryer, John Cox, E. Samuel Crecelius, et al. Law and Policy Resource Guide: A Survey of Eminent Domain Law in Texas and the Nation. Edited by Gabriel Eckstein. Texas A&M University School of Law Program in Natural Resources Systems, 2017. http://dx.doi.org/10.37419/eenrs.eminentdomainguide.
Full textAbstract:
Eminent Domain is the power of the government or quasi-government entities to take private or public property interests through condemnation. Eminent Domain has been a significant issue since 1879 when, in the case of Boom Company v. Patterson, the Supreme Court first acknowledged that the power of eminent domain may be delegated by state legislatures to agencies and non-governmental entities. Thus, the era of legal takings began. Though an important legal dispute then, more recently eminent domain has blossomed into an enduring contentious social and political problem throughout the United States. The Fifth Amendment to the United States Constitution states, “nor shall private property be taken for public use, without just compensation.” Thus, in the wake of the now infamous decision in Kelo v. City of New London, where the Court upheld the taking of private property for purely economic benefit as a “public use,” the requirement of “just compensation” stands as the primary defender of constitutionally protected liberty under the federal constitution. In response to Kelo, many state legislatures passed a variety of eminent domain reforms specifically tailoring what qualifies as a public use and how just compensation should be calculated. Texas landowners recognize that the state’s population is growing at a rapid pace. There is an increasing need for more land and resources such as energy and transportation. But, private property rights are equally important, especially in Texas, and must be protected as well. Eminent domain and the condemnation process is not a willing buyer and willing seller transition; it is a legally forced sale. Therefore, it is necessary to consider further improvements to the laws that govern the use of eminent domain so Texas landowners can have more assurance that this process is fair and respectful of their private property rights when they are forced to relinquish their land. This report compiles statutes and information from the other forty-nine states to illustrate how they address key eminent domain issues. Further, this report endeavors to provide a neutral third voice in Texas to strike a more appropriate balance between individual’s property rights and the need for increased economic development. This report breaks down eminent domain into seven major topics that, in addition to Texas, seemed to be similar in many of the other states. These categories are: (1) Awarding of Attorneys’ Fee; (2) Compensation and Valuation; (3) Procedure Prior to Suit; (4) Condemnation Procedure; (5) What Cannot be Condemned; (6) Public Use & Authority to Condemn; and (7) Abandonment. In analyzing these seven categories, this report does not seek to advance a particular interest but only to provide information on how Texas law differs from other states. This report lays out trends seen across other states that are either similar or dissimilar to Texas, and additionally, discusses interesting and unique laws employed by other states that may be of interest to Texas policy makers. Our research found three dominant categories which tend to be major issues across the country: (1) the awarding of attorneys’ fees; (2) the valuation and measurement of just compensation; and (3) procedure prior to suit.
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Dasberg, Shmuel, Jan W. Hopmans, Larry J. Schwankl, and Dani Or. Drip Irrigation Management by TDR Monitoring of Soil Water and Solute Distribution. United States Department of Agriculture, August 1993. http://dx.doi.org/10.32747/1993.7568095.bard.
Full textAbstract:
Drip irrigation has the potential of high water use efficiency, but actual water measurement is difficult because of the limited wetted volume. Two long-term experiments in orchards in Israel and in California and several field crop studies supported by this project have demonstrated the feasibility of precise monitoring of soil water distribution for drip irrigation in spite of the limited soil wetting. Time Domain Reflectometry (TDR) enables in situ measurement of soil water content of well defined small volumes. Several approaches were tried in monitoring the soil water balance in the field during drip irrigation. These also facilitated the estimation of water uptake: 1. The use of multilevel moisture probe TDR system. This approach proved to be of limited value because of the extremely small diameter of measurement. 2. The placement of 20 cm long TDR probes at predetermined distances from the drippers in citrus orchards. 3. Heavy instrumentation with neutron scattering access tubes and tensiometers of a single drip irrigated almond tree. 4. High resolution spatial and temporal measurements (0.1m x 0.1m grid) of water content by TDR in corn irrigated by surface and subsurface drip. The latter approach was accompanied by parametric modelling of water uptake intensity patterns by corn roots and superimposed with analytical solutions for water flow from point and line sources. All this lead to general and physically based suggestions for the placement of soil water sensors for scheduling drip irrigation.