Relevant bibliographies by topics / Loss Coefficients

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Loss Coefficients'

Author: Grafiati
Published: 4 June 2021
Last updated: 8 February 2022

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Journal articles on the topic "Loss Coefficients"

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Azami, Rahmat. "Using nodal marginal loss coefficients for transmission loss allocation." Indian Journal of Science and Technology 5, no. 3 (March 20, 2012): 1–4. http://dx.doi.org/10.17485/ijst/2012/v5i3.16.

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Jethmalani, C. H. Ram, Poornima Dumpa, Sishaj P. Simon, and K. Sundareswaran. "Transmission Loss Calculation using A and B Loss Coefficients in Dynamic Economic Dispatch Problem." International Journal of Emerging Electric Power Systems 17, no. 2 (April 1, 2016): 205–16. http://dx.doi.org/10.1515/ijeeps-2015-0181.

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Abstract This paper analyzes the performance of A-loss coefficients while evaluating transmission losses in a Dynamic Economic Dispatch (DED) Problem. The performance analysis is carried out by comparing the losses computed using nominal A loss coefficients and nominal B loss coefficients in reference with load flow solution obtained by standard Newton-Raphson (NR) method. Density based clustering method based on connected regions with sufficiently high density (DBSCAN) is employed in identifying the best regions of A and B loss coefficients. Based on the results obtained through cluster analysis, a novel approach in improving the accuracy of network loss calculation is proposed. Here, based on the change in per unit load values between the load intervals, loss coefficients are updated for calculating the transmission losses. The proposed algorithm is tested and validated on IEEE 6 bus system, IEEE 14 bus, system IEEE 30 bus system and IEEE 118 bus system. All simulations are carried out using SCILAB 5.4 (www.scilab.org) which is an open source software.
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Mumma, Stanley A., Thomas A. Mahank, and Yu-Pei Ke. "Analytical determination of duct fitting loss-coefficients." Applied Energy 61, no. 4 (December 1998): 229–47. http://dx.doi.org/10.1016/s0306-2619(98)00041-5.

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Zavesky, Richard R., and Alvin S. Goodman. "WATER-SURFACE PROFILES WITHOUT ENERGY LOSS COEFFICIENTS." Journal of the American Water Resources Association 24, no. 6 (December 1988): 1281–87. http://dx.doi.org/10.1111/j.1752-1688.1988.tb03048.x.

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Jasinski, Joseph M. "Surface loss coefficients for the silyl radical." Journal of Physical Chemistry 97, no. 29 (July 1993): 7385–87. http://dx.doi.org/10.1021/j100131a002.

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Uriarte, Irati, Aitor Erkoreka, Asier Legorburu, Koldo Martin-Escudero, Catalina Giraldo-Soto, and Moises Odriozola-Maritorena. "Decoupling the heat loss coefficient of an in-use office building into its transmission and infiltration heat loss coefficients." Journal of Building Engineering 43 (November 2021): 102591. http://dx.doi.org/10.1016/j.jobe.2021.102591.

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Toumiya, Tatsumi, Takeshi Matsuo, and Takayuki Suzuki. "An Estimation Technique of Windmill Torque Loss Coefficients (Torque Coefficient) for Propeller Type Windmill." IEEJ Transactions on Power and Energy 111, no. 6 (1991): 661–69. http://dx.doi.org/10.1541/ieejpes1990.111.6_661.

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Channiwala, S. A., and N. I. Doshi. "Heat loss coefficients for box-type solar cookers." Solar Energy 42, no. 6 (1989): 495–501. http://dx.doi.org/10.1016/0038-092x(89)90050-9.

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Toumiya, T., T. Matsuo, and T. Suzuki. "A method of measuring windmill torque loss coefficients." Renewable Energy 1, no. 2 (January 1991): 237–41. http://dx.doi.org/10.1016/0960-1481(91)90081-y.

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Kim, Yong-Tae, Gyu-Won Cho, and Gyu-Tak Kim. "The Estimation Method Comparison of Iron Loss Coefficients through the Iron Loss Calculation." Journal of Electrical Engineering and Technology 8, no. 6 (November 1, 2013): 1409–14. http://dx.doi.org/10.5370/jeet.2013.8.6.1409.

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Dissertations / Theses on the topic "Loss Coefficients"

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Elgattas, Mohammed Saleh. "Loss coefficients at straight through manholes." Thesis, University of Sheffield, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364235.

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Kabwe, Aime Mume. "Non-Newtonian loss coefficients for Saunders diaphragm valves." Thesis, Cape Peninsula University of Technology, 2009. http://hdl.handle.net/20.500.11838/914.

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Dissertation submitted in fulfilment of requirements for the degree Master Technology: Chemical Engineering in the FACULTY OF ENGINEERING at the CAPE PENINSULA UNIVERSITY OF TECHNOLOGY, 2009
The prediction of the energy losses when designing pipeline and pumping systems requires accurate loss coefficient data. But the loss coefficient data found in the open literature was not adequate for predicting the loss coefficient for Saunders straight-through diaphragm valves. As more accurate loss coefficient data to enable more efficient pipeline designs are scarce in the open literature, it is problematic to predict the head loss due to the pipeline fittings, and particularly for diaphragm valves. Most of the data given in the literature are for turbulent flow based on water. Due to water shortages mining operations are forced to increase their solids concentrations and to operate in laminar flow (Slatter, 2002). Consequently there is a need to determine loss coefficient data in laminar flow for valves used in these industries to ensure energy efficient designs (Pienaar et al., 2001; 2004) or if needed, to derive a new correlation to predict losses through Saunders diaphragm valves. However, a systematic study of various sizes of diaphragm valves of different manufacturers to ascertain, if the same loss coefficient can be applied, has never been done. Therefore a comparison will be made between the data produced in this work and the existing correlations. The objective of this research was to determine loss coefficient data in laminar, transitional and turbulent flow for the Saunders type straight-through diaphragm valves ranging from 40 mm to 100 mm in the fully open, 75 %, 50 % and 25 % open positions, using a range of Newtonian and non-Newtonian fluids. The test work was conducted on the valve test rig in the Flow Process Research Centre at the Cape Peninsula University of Technology. This work investigated only Newtonian and time independent homogeneous non-Newtonian fluids or slurries flowing through Saunders straight-through diaphragm valves in the turbulent, transitional and laminar regimes. Weir-type Saunders valves and time-dependent fluid behaviour were not investigated in this study. Preamble Non-Newtonian Loss Coefficients for Saunders Diaphragm Valves A Mume Kabwe The results for each test are presented in the form of valve loss coefficient (kvalve) against Reynolds number (Re). This thesis adds new loss coefficient data to the open literature, and a new correlation, which will be useful for designing pipelines in industries, as well as contributing to the academic debate in this discipline.
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Sharp, Zachary B., and William J. Rahmeyer. "Energy Losses in Cross Junctions." DigitalCommons@USU, 2009. https://digitalcommons.usu.edu/etd/256.

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Solving for energy losses in pipe junctions has been a focus of study for many years. Although pipe junctions and fittings are at times considered "minor losses" in relation to other energy losses in a pipe network, there are cases where disregarding such losses in flow calculations will lead to errors. To facilitate these calculations, energy loss coefficients (K-factors) are commonly used to obtain energy losses for elbows, tees, crosses, valves, and other pipe fittings. When accurate K-factors are used, the flow rate and corresponding energy at any location in a pipe network can be calculated. K-factors are well defined for most pipe junctions and fittings; however, the literature documents no complete listings of K-factors for crosses. This study was commissioned to determine the K-factors for a wide range of flow combinations in a single pipe cross and the results provide information previously unavailable to compute energy losses associated with crosses. To obtain the loss coefficients, experimental data were collected in which the flow distribution in each of the four cross legs was varied to quantify the influence of velocity and flow distribution on head loss. For each data point the appropriate K-factors were calculated, resulting in over one thousand experimental K-factors that can be used in the design and analysis of piping systems containing crosses.
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Coombs, Hayden J. "Pressure Loss Coefficients for Large Mitered Elbows with Diameters Ranging from 36-inches to 144-inches." DigitalCommons@USU, 2019. https://digitalcommons.usu.edu/etd/7426.

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When designing a pipeline system, it is important to understand the pressure losses that will occur within the system. One common source of pressure loss is from elbow pipe fittings. There is extensive research available for pressure loss coefficients of elbow pipe fittings, but the research is derived from elbows with relatively smaller pipe diameters. The purpose of this research is to investigate pressure losses associated with larger diameter mitered elbows (36-inches to 144-inches). The dimensions for all mitered elbows considered in this research follow ANSI/AWWA C208-17 recommendations (AWWA 2017). Due to the large size of the mitered elbows of interest, physical testing was not feasible for this research. Therefore, this research used numerical methods to determine the pressure loss coefficients of large mitered elbows, reducing mitered elbows, and expanding mitered elbows. The results suggest a strong correlation that the pressure loss for large mitered elbows, presented in this research, are solely dependent on the pipe Reynolds number. The reducing and expanding mitered elbows showed the pressure loss coefficient is dependent on Reynolds number and the percent of reduction/expansion of the elbow. Tabulated data, graphical data, and recommended equations are presented to determine pressure loss for large mitered elbows, reducing mitered elbows, and expanding elbows.
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Marx, Alton Cadle. "Determining appropriate loss coefficients for use in the nozzle-model of a stage-by-stage turbine model." Master's thesis, Faculty of Engineering and the Built Environment, 2019. https://hdl.handle.net/11427/31619.

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A previously developed turbine modelling methodology, requiring minimal blade passage information, produced a customizable turbine stage component. This stage-by-stage turbine nozzlemodel component was derived from the synthesis of classical turbine theory and classical nozzle theory enabling the component to accurately model a turbine stage. Utilizing Flownex, a thermohydraulic network solver, the turbine stage component can be expanded to accurately model any arrangement and category of turbine. This project focused on incorporating turbine blade passage geometrical information, as it relates to the turbine specific loss coefficients, into the turbine stage component to allow for the development of turbine models capable of predicting turbine performance for various structural changes, anomalies and operating conditions. The development of turbine loss coefficient algorithms as they relate to specific blade geometry data clusters required the investigation of several turbine loss calculation methodologies. A stage-by-stage turbine nozzle-model incorporating turbine loss coefficient algorithms was developed and validated against real turbine test cases obtained from literature. Several turbine models were developed using the loss coefficient governed turbine stage component illustrating its array of capabilities. The incorporation of the turbine loss coefficient algorithms clearly illustrates the correlation between turbine performance deviations and changes in specific blade geometry data clusters.
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Ntamba, Ntamba Butteur Mulumba. "Non-Newtonian pressure loss and discharge coefficients for short square-edged orifices plates." Thesis, Cape Peninsula University of Technology, 2011. http://hdl.handle.net/20.500.11838/1252.

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Thesis (MTech (Mechanical Engineering))--Cape Peninsula University of Technology, 2011.
Despite the extensive research work carried out on flow through short square-edged orifice plates over the last century (e.g. Johansen, 1930; Benedict, 1977; Alvi et al., 1978; Swamee, 2005; ESDU, 2007), gaps in the engineering data still exist for certain ranges of flow conditions and geometries. The majority of data available in the literature are for Newtonian fluids in the turbulent flow regime (ESDU, 2007). Insufficient data have been observed for the orifice with pipe diameter ratio, β = 0.2, in the laminar flow regime. There are no experimental data for β = 0.3 and 0.57. The objective of this thesis was to conduct wide-ranging experimental studies of the flow in orifice plates, which included those geometrical configurations, by measuring pressure loss coefficients and discharge coefficients across the orifice plates using both Newtonian fluids and non-Newtonian fluids in both laminar and turbulent flow regimes. The test work was conducted on the valve test rig at the Cape Peninsula University of Technology. Four classical circular short square-edged orifice plates having, β = 0.2, 0.3, 0.57 and 0.7, were tested. In addition, two generation 0 Von Koch orifice plates (Von Koch, 1904), with equivalent cross sectional area were also tested for β = 0.57. Water was used as Newtonian fluid to obtain turbulent regime data and also for calibration purposes to ensure measurement accuracy and carboxymethyl cellulose, bentonite and kaolin slurries were used at different concentrations to obtain laminar and transitional loss coefficient data. The hydraulic grade line method was used to evaluate pressure loss coefficients (Edwards et al., 1985), while the flange tap arrangement method was used to determine the discharge coefficients (ESDU, 2007). A tube viscometer with three different pipe diameters was used to obtain the rheological properties of the fluids. The results for each test are presented in the form of pressure loss coefficient (kor) and discharge coefficient (Cd) against pipe Reynolds number (Re)
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Pentsos, Vasileios. "ANALYSIS OF A NON-IDEAL (LOSSY) TRI-MICRORING OPTICAL SYSTEM." OpenSIUC, 2018. https://opensiuc.lib.siu.edu/theses/2447.

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Optical switchers can fulfill the same functions as all-electrical switching systems and are expected to play a key role in the near future. In this thesis an analysis if an optical system that can potentially behave as an optical switcher is discussed. This configuration consists of three microring resonators which are coupled and tangential to one another in a topology that is similar to the Leibniz packing or Apollonian gasket. The ray-transfer matrix approach is used in order to represent the whole system by a single matrix. The structure receives an initial input signal and gives an output signal, which is changed by only a scalar factor. This description is equal to an eigenvalue problem, where the matrix of the system operates over an initial vector and results a product of a scalar (the eigenvalue) times the initial vector. Due to its unique geometry each ring is divided into two unequal segments. We introduce the loss coefficients to express the attenuation along those segments. The relation between the loss coefficients is being examined and the results are verified by simulations.
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Baker, Jose Enrique. "Measurements of leakage, power loss and rotordynamic force coefficients in a hybrid brush seal." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2767.

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Stamos, Dimitrios Georgios. "Experimental Analysis of the Interaction of Water Waves With Flexible Structures." Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/27567.

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An experimental investigation of the interaction of water waves with flexible structures acting as breakwaters was carried out. Wave profiles, mapped out by water level measuring transducers, were studied to provide information on the performance of different breakwater models. A new signal analysis procedure for determining reflection coefficients based on wavelet theory was developed and compared to a conventional method. The reliability of using wavelet analysis to separate a partial standing wave into incident and reflected wave components was verified with a numerical example. It was also verified by the small variance in the estimates of the incident wave height from independent experimental measurements. Different geometries of rigid and flexible structures were constructed and examined. Reflection, transmission and energy loss coefficients were obtained over them. The influence of various properties of the models, such as the width and the internal pressure, on the effectiveness in reflecting or absorbing the incident wave energy was determined. Various factors which affect the performance of the breakwater, including the water depth, the wave length and the wave amplitude, were measured and documented. Suspended and bottom-mounted models were considered. The flow field over and near a hemi-cylindrical breakwater model was also examined using a flow visualization technique. An overall comparison among the models has also been provided. The results showed that the rectangular models, rigid and flexible, are the most effective structures to dissipate wave energy. The flow visualization technique indicated that the flow conforms with the circular geometry of a hemi-cylindrical breakwater model, yielding no flow separation.
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Sousa, Alves Joao. "Experimental and CFD Analysis of a Biplane Wells Turbine for Wave Energy Harnessing." Thesis, KTH, Mekanik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-124070.

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Several alternative ways of producing energy came up as the world took conscience of the finite availability of fossil fuels and the environmental consequences of its use and processing. Wave and tidal energy are among the so called green energies. Wave energy converters have been under research for the past two decades and yet there hasn’t been one technology that gathered everyone’s acceptance as being the most suitable one. The present work is focused on a self-rectifying turbine for wave energy harnessing. It’s a self-rectifying biplane Wells with an intermediate stator. The main goal is to evaluate the performance of such a turbine. Two different analyses were performed: experimental and computational. The experimental tests were made so that efficiency, velocity profiles and loss coefficients could be calculated. To do so scaled-down prototypes were built from scratch and tested experimentally. The 3D numerical analysis was possible by using a CFD commercial code: Fluent 6.3. Several simulations were performed for different flow coefficients. Three different degrees of mesh refinement were applied and k-ε turbulence model was the one chosen to simulate the viscous behavior of the flow through the turbine. A steady-state analysis is due and two mixing planes were used at the interfaces between the rotors and the stator. In the end comparisons are made between the experimental and numerical results
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Books on the topic "Loss Coefficients"

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Tullis, Blake P. Hydraulic Loss Coefficients for Culverts. Washington, D.C.: Transportation Research Board, 2012. http://dx.doi.org/10.17226/22673.

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Tullis, Blake P. Hydraulic Loss Coefficients for Culverts. Washington, D.C: TRANSPORTATION RESEARCH BOARD, 2012.

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Davis, Bob. Manufactured homes acquisition program: Heat loss assumptions, calculations, and heat loss coefficient tables. Seattle, WA: Ecotope, Inc., 1992.

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Book chapters on the topic "Loss Coefficients"

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Colombini, Ferruccio, Daniele Del Santo, and Francesco Fanelli. "No Loss of Derivatives for Hyperbolic Operators with Zygmund-Continuous Coefficients in Time." In Springer INdAM Series, 127–48. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-61346-4_6.

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Lu, Tiantian, Wenying Liu, and Xiaomin Zhang. "Z-BUS Loss Redistribution Based on Average Loss Coefficient." In Lecture Notes in Electrical Engineering, 183–89. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-4981-2_20.

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Bae, Moonsung, and Byongjun Lee. "Load Loss Coefficient and Power Loss Tracing in Power Systems." In Advances in Computer Science and Ubiquitous Computing, 240–47. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-7605-3_40.

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Haroon, Abdullah, Shahbaz Ahmad, and Ajmal Hussain. "CFD Prediction of Loss Coefficient in Straight Pipes." In Water Science and Technology Library, 477–85. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-55125-8_41.

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Berndt, Bruce C., and George E. Andrews. "Formulas for the Power Series Coefficients of Certain Quotients of Eisenstein Series." In Ramanujan's Lost Notebook, 1–70. New York, NY: Springer New York, 2009. http://dx.doi.org/10.1007/b13290_12.

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Craik, Robert J. M. "The Relationship between Transmission Coefficient and Coupling Loss Factor." In IUTAM Symposium on Statistical Energy Analysis, 349. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-015-9173-7_31.

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von Weizsäcker, Carl Christian, and Hagen M. Krämer. "Real Capital." In Saving and Investment in the Twenty-First Century, 63–103. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-75031-2_4.

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AbstractPreshaped by the influence of Marx, Böhm-Bawerk and modern neoclassical economics, the general opinion is that the marginal product of capital must always be positive. With the help of the “period of production” T, we define a coefficient of intertemporal substitutionψ that is always non-negative. It can also be used when the real interest rate is negative. With the help of the concept of the “waiting period” Z, we can also define an always non-negative coefficient of intertemporal substitutionγ for the household side. The “loss formula” for deviations of the rate of interest from the growth rate is one application of ψ and γ. Ω = (ψT2 + γZ2)(r − g)2/2 provides a good approximation of the relative loss Ω. Overcomplexity of the system of production leads to negative marginal returns on capital. It can be empirically presumed that the OECD plus China region is on the cusp of overcomplexity. The hypothetical natural rate of interest in the eurozone is well into the minuses. To determine the value of the real capital of the private sector in the OECD plus China region, we use a framework of data taken from the World Inequality Database (WID.world). We have supplemented the data available there with data from other sources and adapted it to our theoretical objectives. According to our estimates, private wealth in the form of real capital in the OECD plus China region comes to approximately four times total annual consumption.
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Wu, Y. B., B. Zhang, and J. W. Xiao. "Local Loss Coefficient of Laminar Flow through Sudden Enlargement in Circular Pipes." In New Trends in Fluid Mechanics Research, 501. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-75995-9_164.

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Hipp, John R., and Jae Hong Kim. "Income Inequality and Economic Segregation in Los Angeles from 1980 to 2010." In The Urban Book Series, 371–87. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-64569-4_19.

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AbstractRising income inequality is a critical problem in both the global North and South. In the United States, the Gini coefficient measuring nationwide income inequality rose from 0.403 in 1980 to 0.480 in 2014 (US Census), and residential segregation by income has increasingly occurred in many metropolitan regions and is particularly reflected in the spatial separation of the wealthiest households. This chapter focuses on the change in the level of income inequality in the Los Angeles region since 1980 and how it is related to changes in residential segregation between economic groups over that same time period. We use data from the US Census collected in 1980, 1990, 2000, and 2010. We measure residential segregation between economic groups based on occupational structure, and measure ‘neighbourhoods’ using Census tracts: these are units defined by the US Census and typically average about 4,000 residents. The overall level of inequality in the region is measured at each decade point using the Gini coefficient for household income. Maps demonstrate where different socioeconomic status groups have tended to locate and how economic segregation has changed in Los Angeles over this time period. We also assess the extent to which changes in inequality are related to changes in economic segregation over the last four and a half decades.
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Kim, Kyongha, and Yongho Jeong. "Hydrological Variations of Discharge, Soil Loss and Recession Coefficient in Three Small Forested Catchments." In Environmental Forest Science, 431–38. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5324-9_47.

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Conference papers on the topic "Loss Coefficients"

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Handy, Tim A., Evan C. Lemley, Dimitrios V. Papavassiliou, and Henry J. Neeman. "Loss Coefficients in Microelbows." In ASME 2009 Fluids Engineering Division Summer Meeting. ASMEDC, 2009. http://dx.doi.org/10.1115/fedsm2009-78517.

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The goal of this study was to determine laminar pressure loss coefficients for flow in microelbows with circular and trapezoidal cross-sections. Flow conditions and pressure losses in these elbows are of interest in microfluidic devices, in porous media, and in other types of microfluidic networks. The literature focuses almost exclusively on loss coefficients due to turbulent flow in macroelbows with very little data on laminar flow in macroelbows. The pressure loss coefficients determined in this study are intended to aid in realistic simulation of existing laminar flow networks or the design of these networks. This study focused on an elbow of constant cross-section with inlet and outlet tubes of sufficient length so as to allow fully developed laminar flow at the entrance to the elbow and at the outlet tube exit. For the circular elbow, both the ratio of elbow radius to inner diameter and inlet Reynolds number were allowed to vary over the ranges of 0.5—10.5 and 1—2500, respectively. The laminar pressure loss coefficients were determined by simulating incompressible flow over the range of geometries and Reynolds numbers in the commercial CFD software FLUENT. The pressure and velocity distributions in the inlet and outlet tubes were averaged at multiple upstream and downstream positions, and were then used to extrapolate the loss coefficient due to the elbow. The results showed that the loss coefficient for larger ratios tended to be higher, in some cases in excess of 100, at low Reynolds number flows, but as the flow approached the transitional regime, the loss coefficients leveled out to roughly their accepted turbulent values of between 0.4 and 1.0. These results show good qualitative and quantitative agreement with limited laminar elbow experimental data available for macroelbows. For the trapezoidal elbows the loss coefficient levels off to about two for Reynolds numbers greater than 100.
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Fliscounakis, S., F. Lafeuillade, and C. Limousin. "Estimation of transmission loss coefficients from measurements." In 2005 IEEE Russia Power Tech. IEEE, 2005. http://dx.doi.org/10.1109/ptc.2005.4524642.

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Lankalapalli, Kiran, and Stephen Idem. "Pressure Loss Coefficients for VAV Terminal Units." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23047.

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Abstract This study utilizes static pressure drop data taken from one manufacturer’s catalog to develop total pressure loss coefficient correlations for single duct VAV terminal units having a circular inlet duct and a rectangular outlet. The control dampers for each box were assumed to be in their wide open position. Separate correlations are presented for cases including a plain box, as well as terminal units that have either hot water reheat coils consisting of one to four tube rows, or an electrical heating element. In every instance the correlations account for static pressure and velocity pressure changes between the box inlet and outlet, based on cross section changes. The correlations are useful for duct designers, since they facilitate the utilization of numerical duct design approaches that require extensive iterative calculations, such as the static regain method. The correlations are proposed for inclusion in duct fitting loss coefficient databases.
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Lee, W. S. "New Analysis Technique Provides Effective Fluid-Loss Coefficients." In SPE Western Regional Meeting. Society of Petroleum Engineers, 1992. http://dx.doi.org/10.2118/24062-ms.

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Andreis, Antun, Edward Moss, and Beric Skews. "Orifice Loss Coefficients in Strongly Transient Compressible Liquid Flows." In 33rd AIAA Fluid Dynamics Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2003. http://dx.doi.org/10.2514/6.2003-3472.

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Fricke, J., R. Caps, D. Buttner, U. Heinemann, E. Hummer, and A. Kadur. "Thermal Loss Coefficients of Monolithic and Granular Aerogel Systems." In 1986 International Symposium/Innsbruck, edited by Claes-Goeran Granqvist, Carl M. Lampert, John J. Mason, and Volker Wittwer. SPIE, 1986. http://dx.doi.org/10.1117/12.938310.

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Lemley, Evan C., Dimitrios V. Papavassiliou, and Henry J. Neeman. "Simulations to Determine Laminar Loss Coefficients in Arbitrary Planar Dividing Flow Geometries." In ASME/JSME 2007 5th Joint Fluids Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/fedsm2007-37268.

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The goal of this study is to determine laminar stagnation pressure loss coefficients for planar dividing flow. These losses are of clear interest in understanding flow in microfluidic devices, in porous media, or other complicated laminar pore networks. There is no published set of pressure loss coefficients for arbitrary bifurcation geometries that occur in these networks. Additionally, the small number of bifurcation geometries that have been studied are for turbulent flow often found in fluid supply and drain systems. The pressure loss coefficients determined in this study allow realistic simulation of existing laminar flow networks or the design of these networks. This study focuses on a single inlet duct with two outlet ducts, which were allowed to vary in diameter, flow fraction, and angle — all relative to the inlet duct. Laminar stagnation pressure loss coefficients have been determined by simulating incompressible flow through 600 different geometries. In all cases, the flow is laminar in the inlet and outlet ducts. Simulations of the dividing flow geometries were done using FLUENT and a custom written computer code, which automates the process of creating flow geometries, of creating FLUENT input files, and of parsing FLUENT output. The outputs, pressure and velocity distributions at the inlet and outlets, have been averaged and then used to calculate pressure loss coefficients for each of the geometries and flow fraction scenarios simulated. The results for loss coefficient for the geometries considered range from 0.15 to 49. The loss coefficient for any geometry increases significantly as the flow fraction increases and as the duct size of an outlet duct relative to the inlet duct decreases. Less significant variation of the loss coefficient has been observed as a function of the angles of the exit ducts.
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Fidan, Baris, and Ilknur Umay. "Adaptive source localization with unknown permittivity and path loss coefficients." In 2015 IEEE International Conference on Mechatronics (ICM). IEEE, 2015. http://dx.doi.org/10.1109/icmech.2015.7083968.

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Akiror, Jemimah C., and Pragasen Pillay. "On the coefficients of core loss formulas for electrical machines." In IECON 2012 - 38th Annual Conference of IEEE Industrial Electronics. IEEE, 2012. http://dx.doi.org/10.1109/iecon.2012.6388907.

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Anderson, D. S., and B. P. Tullis. "Experimentally Determined Inlet Loss Coefficients for Buried-Invert, Circular Culverts." In World Environmental and Water Resources Congress 2006. Reston, VA: American Society of Civil Engineers, 2006. http://dx.doi.org/10.1061/40856(200)180.

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Reports on the topic "Loss Coefficients"

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Meadows, J. B., J. R. Spears, A. R. Feder, B. P. Moore, and C. E. Young. Large scale steam flow test: Pressure drop data and calculated pressure loss coefficients. Office of Scientific and Technical Information (OSTI), December 1993. http://dx.doi.org/10.2172/10108927.

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Davis, Bob, and David Baylon. Manufactured Homes Acquisition Program : Heat Loss Assumptions and Calculations, Heat Loss Coefficient Tables. Office of Scientific and Technical Information (OSTI), May 1992. http://dx.doi.org/10.2172/5170729.

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Davis, Bob, and David Baylon. Manufactured Homes Acquisition Program : Heat Loss Assumptions and Calculations, Heat Loss Coefficient Tables. Office of Scientific and Technical Information (OSTI), May 1992. http://dx.doi.org/10.2172/10151809.

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Thomas, Douglas, and Mellon Michael. Sublimation of terrestrial permafrost and the implications for ice-loss processes on Mars. Engineer Research and Development Center (U.S.), July 2021. http://dx.doi.org/10.21079/11681/41244.

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Sublimation of ice is rate-controlled by vapor transport away from its outer surface and may have generated landforms on Mars. In ice-cemented ground (permafrost), the lag of soil particles remaining after ice loss decreases subsequent sublimation. Varying soil-ice ratios lead to differential lag development. Here we report 52 years of sublimation measurements from a permafrost tunnel near Fairbanks, Alaska, and constrain models of sublimation, diffusion through porous soil, and lag formation. We derive the first long-term in situ effective diffusion coefficient of ice-free loess, a Mars analog soil, of 9.05 × 10⁻⁶ m² s⁻¹, ~5× larger than past theoretical studies. Exposed ice-wedge sublimation proceeds ~4× faster than predicted from analogy to heat loss by buoyant convection, a theory frequently employed in Mars studies. Our results can be used to map near-surface ice-content differences, identify surface processes controlling landform formation and morphology, and identify target landing sites for human exploration of Mars.
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Duvvuri, Sarvani, and Srinivas S. Pulugurtha. Researching Relationships between Truck Travel Time Performance Measures and On-Network and Off-Network Characteristics. Mineta Transportation Institute, July 2021. http://dx.doi.org/10.31979/mti.2021.1946.

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Trucks serve significant amount of freight tonnage and are more susceptible to complex interactions with other vehicles in a traffic stream. While traffic congestion continues to be a significant ‘highway’ problem, delays in truck travel result in loss of revenue to the trucking companies. There is a significant research on the traffic congestion mitigation, but a very few studies focused on data exclusive to trucks. This research is aimed at a regional-level analysis of truck travel time data to identify roads for improving mobility and reducing congestion for truck traffic. The objectives of the research are to compute and evaluate the truck travel time performance measures (by time of the day and day of the week) and use selected truck travel time performance measures to examine their correlation with on-network and off-network characteristics. Truck travel time data for the year 2019 were obtained and processed at the link level for Mecklenburg County, Wake County, and Buncombe County, NC. Various truck travel time performance measures were computed by time of the day and day of the week. Pearson correlation coefficient analysis was performed to select the average travel time (ATT), planning time index (PTI), travel time index (TTI), and buffer time index (BTI) for further analysis. On-network characteristics such as the speed limit, reference speed, annual average daily traffic (AADT), and the number of through lanes were extracted for each link. Similarly, off-network characteristics such as land use and demographic data in the near vicinity of each selected link were captured using 0.25 miles and 0.50 miles as buffer widths. The relationships between the selected truck travel time performance measures and on-network and off-network characteristics were then analyzed using Pearson correlation coefficient analysis. The results indicate that urban areas, high-volume roads, and principal arterial roads are positively correlated with the truck travel time performance measures. Further, the presence of agricultural, light commercial, heavy commercial, light industrial, single-family residential, multi-family residential, office, transportation, and medical land uses increase the truck travel time performance measures (decrease the operational performance). The methodological approach and findings can be used in identifying potential areas to serve as truck priority zones and for planning decentralized delivery locations.
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Wei, Fulu, Ce Wang, Xiangxi Tian, Shuo Li, and Jie Shan. Investigation of Durability and Performance of High Friction Surface Treatment. Purdue University, 2021. http://dx.doi.org/10.5703/1288284317281.

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The Indiana Department of Transportation (INDOT) completed a total of 25 high friction surface treatment (HFST) projects across the state in 2018. This research study attempted to investigate the durability and performance of HFST in terms of its HFST-pavement system integrity and surface friction performance. Laboratory tests were conducted to determine the physical and mechanical properties of epoxy-bauxite mortar. Field inspections were carried out to identify site conditions and common early HFST distresses. Cyclic loading test and finite element method (FEM) analysis were performed to evaluate the bonding strength between HFST and existing pavement, in particular chip seal with different pretreatments such as vacuum sweeping, shotblasting, and scarification milling. Both surface friction and texture tests were undertaken periodically (generally once every 6 months) to evaluate the surface friction performance of HFST. Crash records over a 5-year period, i.e., 3 years before installation and 2 years after installation, were examined to determine the safety performance of HFST, crash modification factor (CMF) in particular. It was found that HFST epoxy-bauxite mortar has a coefficient of thermal expansion (CTE) significantly higher than those of hot mix asphalt (HMA) mixtures and Portland cement concrete (PCC), and good cracking resistance. The most common early HFST distresses in Indiana are reflective cracking, surface wrinkling, aggregate loss, and delamination. Vacuum sweeping is the optimal method for pretreating existing pavements, chip seal in particular. Chip seal in good condition is structurally capable of providing a sound base for HFST. On two-lane highway curves, HFST is capable of reducing the total vehicle crash by 30%, injury crash by 50%, and wet weather crash by 44%, and providing a CMF of 0.584 in Indiana. Great variability may arise in the results of friction tests on horizontal curves by the use of locked wheel skid tester (LWST) due both to the nature of vehicle dynamics and to the operation of test vehicle. Texture testing, however, is capable of providing continuous texture measurements that can be used to calculate a texture height parameter, i.e., mean profile depth (MPD), not only for evaluating friction performance but also implementing quality control (QC) and quality assurance (QA) plans for HFST.
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