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Journal articles on the topic 'PV-flow'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Alsafasfeh, Qais, Omar Saraereh, Imran Khan, and Sunghwan Kim. "Solar PV Grid Power Flow Analysis." Sustainability 11, no. 6 (2019): 1744. http://dx.doi.org/10.3390/su11061744.

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As the unconstrained integration of distributed photovoltaic (PV) power into a power grid will cause changes in the power flow of the distribution network, voltage deviation, voltage fluctuation, and so on, system operators focus on how to determine and improve the integration capacity of PV power rationally. By giving full consideration to the static security index constraints and voltage fluctuation, this paper proposes a maximum integration capacity optimization model of the PV power, according to different power factors for the PV power. Moreover, the proposed research analyzes the large-s

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2

Stewart, Julian M., and Amy Weldon. "Reflex vascular defects in the orthostatic tachycardia syndrome of adolescents." Journal of Applied Physiology 90, no. 6 (2001): 2025–32. http://dx.doi.org/10.1152/jappl.2001.90.6.2025.

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Dependent pooling occurs in postural orthostatic tachycardia syndrome (POTS) related to defective vasoconstriction. Increased venous pressure (Pv) >20 mmHg occurs in some patients (high Pv) but not others (normal Pv). We compared 22 patients, aged 12–18 yr, with 13 normal controls. Continuous blood pressure and strain-gauge plethysmography were used to measure supine forearm and calf blood flow, resistance, venous compliance, and microvascular filtration, and blood flow and swelling during 70° head-up tilt. Supine, high Pv had normal resistance in arms (26 ± 2 mmHg · ml−1 · 100 ml · min) an

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3

Drake, R. E., S. Dhother, R. A. Teague, and J. C. Gabel. "Lymph flow in sheep with rapid cardiac ventricular pacing." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 272, no. 5 (1997): R1595—R1598. http://dx.doi.org/10.1152/ajpregu.1997.272.5.r1595.

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Increases in systemic venous pressure (Pv) associated with heart failure cause an increase in microvascular fluid filtration into the tissue spaces. By removing this excess filtrate from the tissues, lymphatic vessels help to prevent edema. However, the lymphatics drain into systemic veins and an increase in Pv may interfere with lymphatic flow. To test this, we cannulated caudal mediastinal node efferent lymphatics in sheep. We used rapid cardiac ventricular pacing (240-275 beats/min) to cause heart failure for 4-7 days. Each day we determined the lymph flow rate two ways. First, we adjusted

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4

Majeed, Issah Babatunde, and Nnamdi I. Nwulu. "Impact of Reverse Power Flow on Distributed Transformers in a Solar-Photovoltaic-Integrated Low-Voltage Network." Energies 15, no. 23 (2022): 9238. http://dx.doi.org/10.3390/en15239238.

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Modern low-voltage distribution systems necessitate solar photovoltaic (PV) penetration. One of the primary concerns with this grid-connected PV system is overloading due to reverse power flow, which degrades the life of distribution transformers. This study investigates transformer overload issues due to reverse power flow in a low-voltage network with high PV penetration. A simulation model of a real urban electricity company in Ghana is investigated against various PV penetration levels by load flows with ETAP software. The impact of reverse power flow on the radial network transformer load

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Egger, Joseph, and Thomas Spengler. "Nonuniqueness of Attribution in Piecewise Potential Vorticity Inversion." Journal of the Atmospheric Sciences 75, no. 3 (2018): 875–83. http://dx.doi.org/10.1175/jas-d-17-0039.1.

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Abstract Piecewise potential vorticity inversion (PPVI) seeks to determine the impact of observed potential vorticity (PV) anomalies on the surrounding flow. This widely used technique is based on dividing a flow domain D into subdomains D1 and D2 = D − D1. The influence of PV in D1 on the flow in D2 is assessed by removing all PV anomalies in D2 and then inverting the modified PV in D. The resulting flow with streamfunction ψ1 is attributed to the PV anomalies in D1. The relation of PV in D1 to ψ1 in D2 is not unique, because there are many PV distributions in D1 that induce the same ψ1. Ther

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Rukman, Nurul Shahirah, Ahmad Fudholi, Putri Adia Utari, et al. "Bi-fluid cooling effect on electrical characteristics of flexible photovoltaic panel." Journal of Mechatronics, Electrical Power, and Vehicular Technology 12, no. 1 (2021): 51–56. http://dx.doi.org/10.14203/j.mev.2021.v12.51-56.

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A photovoltaic (PV) system integrated with a bi-fluid cooling mechanism, which is known as photovoltaic thermal (PVT) system, was investigated. The electrical characteristics of flexible solar panel were evaluated for PV and PV with bi-fluid (air and water) cooling system. The integration of monocrystalline flexible solar panel into both systems was tested under a fixed solar radiation of 800 W/m2. A total of 0.04–0.10 kg/s of air flow was utilised in PV with cooling system with a fixed water mass flow rate of 0.025 kg/s. The efficiencies of flexible panel for PV and PV with cooling system wer

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7

Yang, Yong, Dong Tao Wang, Qing Mei Yao, and Wen Zhen Cai. "Matpower Based Power Flow Calculation with Grid-Connected Photovoltaic." Applied Mechanics and Materials 713-715 (January 2015): 1343–46. http://dx.doi.org/10.4028/www.scientific.net/amm.713-715.1343.

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Photovoltaic (PV) power generation is one of important direction of future energy development by most countries. The research on power flow calculation of power system with grid-connected photovoltaic generation based on Matpower is given in this paper. Firstly, a stochastic model of PV system is presented in the paper. Then, Matpower is used in the simulation of power flow for IEEE 57 node system. Simulation results of with PV generation and without PV generation in IEEE 57 node system are presented. Comparison between the results shows that adding PV generation in power system will have grea

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Han, Fei, Ning Zhou, Jian Wei Ma, and Xian Ling Yu. "Power Flow Calculation for Distribution System Including PV Type Distributed Generation." Applied Mechanics and Materials 694 (November 2014): 159–62. http://dx.doi.org/10.4028/www.scientific.net/amm.694.159.

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After distribution network with PV type distributed generation, it emerged PV nodes. Advanced forward and backward substitution method is proposed based on ant colony optimization method to improve power flow solution, which is a method based on ant colony optimization calculation algorithm of reactive power correction, improved the model of PV type distributed generation in the power flow calculation.Use PSSSINCAL power system simulation software to set up the model of distribution System including PV type distributed generation. Through the results of simulation calculation show that the alg

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9

Nakamura, Noboru, and Da Zhu. "Finite-Amplitude Wave Activity and Diffusive Flux of Potential Vorticity in Eddy–Mean Flow Interaction." Journal of the Atmospheric Sciences 67, no. 9 (2010): 2701–16. http://dx.doi.org/10.1175/2010jas3432.1.

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Abstract An exact diagnostic formalism for finite-amplitude eddy–mean flow interaction is developed for barotropic and quasigeostrophic baroclinic flows on the beta plane. Based on the advection–diffusion–reaction equation for potential vorticity (PV), the formalism quantifies both advective and diffusive contributions to the mean flow modification by eddies, of which the latter is the focus of the present article. The present theory adopts a hybrid Eulerian–Lagrangian-mean description of the flow and defines finite-amplitude wave activity in terms of the areal displacement of PV contours from

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10

Dong, Li, and Stephen J. Colucci. "The Role of Deformation and Potential Vorticity in Southern Hemisphere Blocking Onsets." Journal of the Atmospheric Sciences 62, no. 11 (2005): 4043–56. http://dx.doi.org/10.1175/jas3576.1.

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Abstract The relative importance of interactions between deformation and potential vorticity (PV) as a block-onset mechanism is examined in 30 cases of atmospheric blocking over the Southern Hemisphere (SH). The blocking cases are diagnosed with a quasigeostrophic model for the u component of the geostrophic wind tendency. In this model, two mechanisms, the advection of the meridional gradient of PV and interactions between deformation and PV, can force the weakening of westerly flow or increasing easterly flow associated with blocking. The first forcing mechanism, which does not directly incl

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11

Zhang, Yu, Chen Chen, Zhengguang Zhang, and Wei Wang. "Rotating horizontal convection and the potential vorticity constraint." Journal of Fluid Mechanics 803 (August 16, 2016): 72–93. http://dx.doi.org/10.1017/jfm.2016.513.

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Horizontal convection, with a focus on the essential physics it can disclose for the oceanic overturning circulation, is studied in an annular gap where differential heating is applied along the bottom. Based on the three-dimensional distribution of both velocity and temperature fields, we propose that in addition to differential buoyancy forcing and diapycnal mixing, potential vorticity (PV) can also be a limiting factor for the overturning circulation by imposing a constraint on the meridional flow. With rotation, flow has to be along PV contours excepting that effects of diffusion or fricti

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12

Iskandar, Iskandar, Arif Rahman Hakim, Mustofa Mustofa, et al. "The Characterization of A Thermoelectric Generator Type TEC1-12706 Hybridized On 50W Polycrystalline PV." Jurnal Ecotipe (Electronic, Control, Telecommunication, Information, and Power Engineering) 11, no. 2 (2024): 177–84. http://dx.doi.org/10.33019/jurnalecotipe.v11i2.4522.

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The potential of solar energy is very large in generating electrical energy conversion using TEG and PV technology. Therefore, it is important to understand how the technology works. This study aims to characterize the electrical generation of 12 TEG modules type TEC1-12706 hybridized with 2 PV panels. One PV panel is left without a TEG module as a comparison. Meanwhile, on the cold side of the TEG attached to the PV, a heatsink with 3 fins is placed. The left and right fins are air allowed to flow naturally, while the middle fin is flowed with cold water fluid through a 0.01 m diameter water

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13

White, Rachel H., and Lualawi Mareshet Admasu. "Temporally and zonally varying atmospheric waveguides – climatologies and connections to quasi-stationary waves." Weather and Climate Dynamics 6, no. 2 (2025): 549–70. https://doi.org/10.5194/wcd-6-549-2025.

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Abstract. Atmospheric waveguides have been linked to amplified quasi-stationary Rossby waves and thus to extreme weather events in the mid-latitudes. Here, we compare different methods of calculating temporally and spatially varying waveguides, including different ways of separating the waveguides (background flow) from waves. We compare waveguides from potential vorticity (PV) gradients (“PV waveguides”) with barotropic waveguides based on what is known as the stationary wavenumber, or KS (“KS waveguides”), which is calculated from the zonal wind. The PV waveguides use a PV rolling-zonalizati

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Wang, Jikai, and Qunzhi Zhu. "Experimental study on flexible PV/T system under different working conditions." Journal of Physics: Conference Series 2835, no. 1 (2024): 012086. http://dx.doi.org/10.1088/1742-6596/2835/1/012086.

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Abstract In the overall life cycle energy consumption of China’s construction sector, building energy usage constitutes a significant portion, and the process of China’s dual carbon goals can be greatly accelerated by reducing building operation energy consumption. Solar energy, as a kind of renewable energy, is increasingly mature in construction applications. PV/T comprehensive utilization technology has attracted much attention in using solar energy. The flexible PV/T system can fit on the facade of various bending angles. This paper conducts indoor variable working conditions (irradiance a

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Rukman, Nurul Shahirah Binti, Ahmad Fudholi, Wahidin Nuriana, et al. "Thermal Efficiencies of Photovoltaic Thermal (PVT) with Bi-Fluid Cooling System." International Journal of Heat and Technology 40, no. 2 (2022): 423–28. http://dx.doi.org/10.18280/ijht.400209.

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Solar radiation can be converted into thermal and electrical energy by using photovoltaic thermal (PVT) system. This system combines the functions of a flat plate solar collector and a PV panel. PV surface and cells play an important role in enhancing the efficiency of PVT systems; that is, the PV efficiency decreases with increasing solar radiation intensity. PVT systems use a small amount of solar radiation to produce electricity and a bulk amount to generate thermal energy that warms the surface of PV cells. A medium that can effectively absorb heat energy from PV collectors should be used

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Zhe, Leow Wai, Y. M. Irwan, M. Irwanto, A. R. Amelia, and I. Safwati. "Influence of wind speed on the performance of photovoltaic panel." Indonesian Journal of Electrical Engineering and Computer Science 15, no. 1 (2019): 62. http://dx.doi.org/10.11591/ijeecs.v15.i1.pp62-70.

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The aim of this project is to investigate the performance of photovoltaic (PV) panel influence by wind speed in Kangar, Perlis, Malaysia. A low conversion energy efficiency of the PV panel is the major problem of a PV application system. The PV panel is absorbed solar irradiance minor converted into electrical energy, and the rest is converted into heat energy. Therefore, the heat energy generated by the PV panel is increased in its operating temperature. However, PV panel is necessary to operate them at the low operating temperatures to keep the PV panel electrical efficiency at an acceptable

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Beron-Vera, F. J., M. G. Brown, M. J. Olascoaga, I. I. Rypina, H. Koçak, and I. A. Udovydchenkov. "Zonal Jets as Transport Barriers in Planetary Atmospheres." Journal of the Atmospheric Sciences 65, no. 10 (2008): 3316–26. http://dx.doi.org/10.1175/2008jas2579.1.

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The connection between transport barriers and potential vorticity (PV) barriers in PV-conserving flows is investigated with a focus on zonal jets in planetary atmospheres. A perturbed PV staircase model is used to illustrate important concepts. This flow consists of a sequence of narrow eastward and broad westward zonal jets with a staircase PV structure; the PV steps are at the latitudes of the cores of the eastward jets. Numerically simulated solutions to the quasigeostrophic PV conservation equation in a perturbed PV staircase flow are presented. These simulations reveal that both eastward

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18

Matsunuma, Takayuki, and Takehiko Segawa. "Active Flow Control for Passage Vortex Reduction in a Linear Turbine Cascade with Various Tip Clearance Sizes Using a Dielectric Barrier Discharge Plasma Actuator." Aerospace 10, no. 7 (2023): 641. http://dx.doi.org/10.3390/aerospace10070641.

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In an axial-flow turbine of a jet engine used for aircraft propulsion, the passage vortex (PV) and tip leakage vortex (TLV) generated inside the blade passage deteriorate the aerodynamic performance. In this study, a dielectric barrier discharge plasma actuator (PA) was installed in the upstream endwall of the turbine cascade to suppress the PV. The effects of the presence or absence of tip clearance and the change in the size of the tip clearance on the vortex structure at the exit of the turbine cascade were observed by recording the flow velocity distributions using particle image velocimet

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Choi, Hwi-Ung, and Kwang-Hwan Choi. "Performance Evaluation of PV/T Air Collector Having a Single-Pass Double-Flow Air Channel and Non-Uniform Cross-Section Transverse Rib." Energies 13, no. 9 (2020): 2203. http://dx.doi.org/10.3390/en13092203.

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In the present work, the electrical and thermal performances of a newly designed PV/T (photovoltaic/thermal) air collector, which was proposed and fabricated by the author, have been investigated experimentally in the natural weather conditions. The PV/T air collector has a single-pass double-flow air channel. Also, a non-uniform cross-section transverse rib was attached at the back surface of the PV (photovoltaic) module to improve the heat transfer performance between the PV module and flowing air. The experiment was carried out in an outdoor field on a clear day with various air mass flow r

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Roshdan, Wan Nur Adilah Wan, Hasila Jarimi, Adnan Ibrahim, Kamaruzzaman Sopian, and Ali H. A. Al-Waeli. "Indoor Performance Analysis of a Novel Double-Pass photovoltaic/thermal (PV/T) Asymmetric Compound Parabolic Concentrator (ACPC) Solar Collector." IOP Conference Series: Materials Science and Engineering 1278, no. 1 (2023): 012009. http://dx.doi.org/10.1088/1757-899x/1278/1/012009.

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Abstract A photovoltaic/thermal (PV/T) solar collector combines solar photovoltaic (PV) modules and solar thermal that operates simultaneously to generate electricity and thermal energy. Design parameters, operating conditions and environmental factors all have a significant impact on the performance of a PV/T solar collector. This research investigates the influence of the variation in the air mass flow rate to the performance of a novel double-pass photovoltaic/thermal (PV/T) asymmetric compound parabolic concentrator (PV/T-ACPC) solar collector. To investigate performance of the solar colle

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Arslan, Erhan, Azim Doğuş Tuncer, Meltem Koşan, Ekin Can Dolgun, and Mustafa Aktaş. "Designing of a New Type Air-Water Cooled Photovoltaic Collector." Tehnički glasnik 14, no. 1 (2020): 41–45. http://dx.doi.org/10.31803/tg-20190227095246.

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The importance of photovoltaic-thermal (PV / T) collector systems in renewable energy technologies is increasing for combined hybrid electrical heat applications. The efficiency of photovoltaic (PV) systems varies between 5-20%. On average, 15% of the solar radiation coming to the PV panel surface is converted to electrical energy and the remainder is lost. In this study, a PV/T collector was designed using two different fluids simultaneously and its efficiency was calculated numerically. PV/T collector systems are specifically designed for agricultural production and their advantages are disc

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Yang, Jiayan, and James F. Price. "Potential Vorticity Constraint on the Flow between Two Basins." Journal of Physical Oceanography 37, no. 9 (2007): 2251–66. http://dx.doi.org/10.1175/jpo3116.1.

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Abstract This paper examines the role of potential vorticity (PV) balance in source- and sink-driven flows between two basins. As shown in previous studies, PV advection into a basin, say a positive PV advection, requires a negative frictional torque to maintain a steady PV balance. This sense of torque may be provided by a cyclonic boundary current within the basin. The PV advection through a channel is due almost entirely to advection of planetary PV, f/H, where f is the Coriolis parameter and H is the column thickness. Therefore a localized change of depth, and thus H in the channel, direct

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Hartmann, Dennis L. "A PV View of Zonal Flow Vacillation." Journal of the Atmospheric Sciences 52, no. 14 (1995): 2561–76. http://dx.doi.org/10.1175/1520-0469(1995)052<2561:apvozf>2.0.co;2.

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Mourshed, Monjur, Nahid Imtiaz Masuk, Huy Quoc Nguyen, and Bahman Shabani. "An Experimental Approach to Energy and Exergy Analyses of a Hybrid PV/T System with Simultaneous Water and Air Cooling." Energies 15, no. 18 (2022): 6764. http://dx.doi.org/10.3390/en15186764.

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In this paper, the effects of simultaneous air and water cooling on the energy performances of a single-pass hybrid PV/T system are experimentally investigated. Both air and water are used as coolants and are tested at four different mass flow rates, ranging from 0.0014 to 0.0026 kg/s. It is found that the overall efficiency of the PV/T system is dependent on the solar intensity and mass flow rate of coolants. Maximum PV/T system efficiency is found to be 62.2% for a simultaneous flow of water and air at a 0.0026 kg/s flow rate, which is 35.5% higher than the efficiency found at 0.0014 kg/s co

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Wu, Hao, Lin Zhou, Yihao Wan, Qiang Liu, and Siyu Zhou. "A Mixed Uncertainty Power Flow Algorithm-Based Centralized Photovoltaic (PV) Cluster." Energies 12, no. 20 (2019): 4008. http://dx.doi.org/10.3390/en12204008.

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With the large-scale centralized PV clusters connected to grid, the grid power flow has certain randomness. Considering the fluctuation of PV output, an improved Krawczyk-Moore algorithm in a mixed coordinate system is proposed to solve the uncertain power flow problem. Firstly, aiming at the special structure of a centralized PV cluster with only load node and no generator node, this paper proposes a power flow calculation in the mixed power flow coordinate, and then the Krawczyk-Moore operator is used to combine interval and affine arithmetic to overcome the shortcoming of over-conservative

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Arias, Mariz B., and Sungwoo Bae. "Design Models for Power Flow Management of a Grid-Connected Solar Photovoltaic System with Energy Storage System." Energies 13, no. 9 (2020): 2137. http://dx.doi.org/10.3390/en13092137.

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This paper provides models for managing and investigating the power flow of a grid-connected solar photovoltaic (PV) system with an energy storage system (ESS) supplying the residential load. This paper presents a combination of models in forecasting solar PV power, forecasting load power, and determining battery capacity of the ESS, to improve the overall quality of the power flow management of a grid-connected solar PV system. Big data tools were used to formulate the solar PV power forecasting model and load power forecasting model, in which real historical solar electricity data of actual

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Ajel, Mohammed G., Engin Gedik, Hasanain A. Abdul Wahhab, and Basam A. Shallal. "Performance Analysis of an Open-Flow Photovoltaic/Thermal (PV/T) Solar Collector with Using a Different Fins Shapes." Sustainability 15, no. 5 (2023): 3877. http://dx.doi.org/10.3390/su15053877.

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Generally, photovoltaic panels convert solar energy into electricity using semiconductor materials in their manufacture by converting energy into electricity by absorbing heat from solar radiation, which requires reducing the heat of these panels to improve the efficiency of electricity generation. Therefore, the issue of cooling photovoltaic panels became one of the objectives that were addressed in many studies, while cost reduction was the most important concern in the manufacture of these panels, followed by low energy consumption. In this work, the performance analysis for PV panels was a

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Gauduchon, Valérie, Sandra Werner, Gilles Prévost, Henri Monteil, and Didier A. Colin. "Flow Cytometric Determination of Panton-Valentine Leucocidin S Component Binding." Infection and Immunity 69, no. 4 (2001): 2390–95. http://dx.doi.org/10.1128/iai.69.4.2390-2395.2001.

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ABSTRACT The binding of the S component (LukS-PV) from the bicomponent staphylococcal Panton-Valentine leucocidin to human polymorphonuclear neutrophils (PMNs) and monocytes was determined using flow cytometry and a single-cysteine substitution mutant of LukS-PV. The mutant was engineered by replacing a glycine at position 10 with a cysteine and was labeled with a fluorescein moiety. The biological activity of the mutant was identical to that of the native protein. It has been shown that LukS-PV has a high affinity for PMNs (K d = 0.07 ± 0.02 nM, n = 5) and monocytes (Kd = 0.020 ± 0.003 nM,n =

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Chen, Yun, Yadi Li, Jilei Liu, et al. "Study of distribution network loss allocation with high photovoltaic penetration ratio." Journal of Physics: Conference Series 2741, no. 1 (2024): 012069. http://dx.doi.org/10.1088/1742-6596/2741/1/012069.

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Abstract With the rapid development of renewable energy, the penetration ratio of photovoltaic (PV) in the distribution network is getting higher and higher. The fair and reasonable allocation of high loss caused by high PV penetration in the distribution network is of great significance to the healthy development of distribution systems. In order to study the loss allocation in distribution networks with high PV penetration, based on the cooperative game theory, combined with the power flow algorithm, the power flow and loss of the 72-node active distribution network in agricultural and pasto

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BURTON, G. R., and J. NYCANDER. "Stationary vortices in three-dimensional quasi-geostrophic shear flow." Journal of Fluid Mechanics 389 (June 25, 1999): 255–74. http://dx.doi.org/10.1017/s0022112099005029.

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An existence theorem for localized stationary vortex solutions in an external shear flow is proved. The flow is three-dimensional and quasi-geostrophic in an unbounded domain. The external flow is unidirectional, with linear horizontal and vertical shear. The flow conserves an infinite family of Casimir integrals. Flows that have the same value of all Casimir integrals are called isovortical flows, and the potential vorticity (PV) fields of isovortical flows are stratified rearrangements of one another. The theorem guarantees the existence of a maximum-energy flow in any family of isovortical

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Haigh, Michael C., and Pavel S. Berloff. "Potential vorticity redistribution by localised transient forcing in the shallow-water model." Journal of Fluid Mechanics 852 (August 3, 2018): 199–225. http://dx.doi.org/10.1017/jfm.2018.547.

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This study is motivated by the need to develop stochastic parameterisations for representing the effects of mesoscale oceanic eddies in non-eddy-resolving and eddy-permitting ocean circulation models. A necessary logical step on the way to such parameterisations is the understanding of flow responses to spatially stationary and localised, time-dependent ‘plunger’ forcings intended to represent transient eddy flux divergences. Specifically, this study develops an understanding of the plunger-induced convergence of potential vorticity (PV) fluxes using the linearised single-layer shallow-water m

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Fadhel, M. I., Sakhr M. Sultan, and Saqaff Ahmed Alkaff. "Theoretical Study of New Configuration of Photovoltaic/Thermal Solar Collector (PV/T) Design." Advanced Materials Research 772 (September 2013): 681–87. http://dx.doi.org/10.4028/www.scientific.net/amr.772.681.

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The combination of solar thermal and PV technologies leads to form a single module called PVT system. This system is able to produce heat and electricity simultaneously. In this paper, a new configuration and design of PV/T system are proposed, and a theoretical study of this system is evaluated. The PV/T consists of certain layers which are the glass, air gap, PV panel, absorber plate and insulating material layer. The monocrystalline PV and spiral flow absorber plate are used in this study. The results of the system performance under typical sunny climatic Malaysian condition are presented.

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Wang, Chia-chi, and Gudrun Magnusdottir. "ITCZ Breakdown in Three-Dimensional Flows." Journal of the Atmospheric Sciences 62, no. 5 (2005): 1497–512. http://dx.doi.org/10.1175/jas3409.1.

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Abstract The intertropical convergence zone (ITCZ) is observed to undulate and at times break down into a series of tropical disturbances in several days. Some of these disturbances may develop into tropical cyclones and move to higher latitudes, while others dissipate, and the ITCZ may reform in the original region. It has been proposed that the ITCZ may break down because of its heating-induced potential vorticity (PV) anomalies. Here this process is examined in three-dimensional simulations using a primitive equation model. A simulation of the ITCZ in a background state of rest is compared

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Ivchenko, V. O., B. Sinha, V. B. Zalesny, R. Marsh, and A. T. Blaker. "Influence of Bottom Topography on Integral Constraints in Zonal Flows with Parameterized Potential Vorticity Fluxes." Journal of Physical Oceanography 43, no. 2 (2013): 311–23. http://dx.doi.org/10.1175/jpo-d-12-0126.1.

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Abstract An integral constraint for eddy fluxes of potential vorticity (PV), corresponding to global momentum conservation, is applied to two-layer zonal quasigeostrophic channel flow. This constraint must be satisfied for any type of parameterization of eddy PV fluxes. Bottom topography strongly influences the integral constraint compared to a flat bottom channel. An analytical solution for the mean flow solution has been found by using asymptotic expansion in a small parameter, which is the ratio of the Rossby radius to the meridional extent of the channel. Applying the integral constraint t

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Zhang, Wenda, Christopher L. P. Wolfe, and Ryan Abernathey. "Role of Surface-Layer Coherent Eddies in Potential Vorticity Transport in Quasigeostrophic Turbulence Driven by Eastward Shear." Fluids 5, no. 1 (2019): 2. http://dx.doi.org/10.3390/fluids5010002.

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The transport by materially coherent surface-layer eddies was studied in a two-layer quasigeostrophic model driven by eastward mean shear. The coherent eddies were identified by closed contours of the Lagrangian-averaged vorticity deviation obtained from Lagrangian particles advected by the flow. Attention was restricted to eastward mean flows, but a wide range of flow regimes with different bottom friction strengths, layer thickness ratios, and background potential vorticity (PV) gradients were otherwise considered. It was found that coherent eddies become more prevalent and longer-lasting as

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Mathie, RT, JB Desai, and KM Taylor. "The effect of normothermic cardiopulmonary bypass on hepatic blood flow in the dog." Perfusion 1, no. 4 (1986): 245–53. http://dx.doi.org/10.1177/026765918600100403.

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Hepatic blood flow was investigated in two groups of eight anaesthetized dogs during and after one hour of either pulsatile or non-pulsatile cardiopulmonary bypass (CPB). Mean perfusion pressure was maintained at 60 mmHg. Hepatic arterial (HA) and portal venous (PV) blood flows were measured using electromagnetic flow probes, and hepatic O 2 consumption determined. The results demonstrate that: (a) pulsatile CPB reduces peripheral vascular resistance during and after perfusion, and more effectively preserves pump flow rate and cardiac output than non-pulsatile CPB; (b) total liver blood flow i

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Govardhanan, M. S., G. Kumaraguruparan, M. Kameswari, R. Saravanan, M. Vivar, and K. Srithar. "Photovoltaic Module with Uniform Water Flow on Top Surface." International Journal of Photoenergy 2020 (July 10, 2020): 1–9. http://dx.doi.org/10.1155/2020/8473253.

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Though the solar photovoltaic (PV) module is used for power production, it usually works at high temperatures, decreasing its efficiency and therefore its output. So if an effective cooling method is to be implemented, it would reduce the heat from the solar PV module and increase its power production. Significant research in water cooling on both top and bottom surfaces of the PV module widen the scope for uniform cooling with constant module temperature throughout at any instant. In this work, uniform flow is maintained by means of overflow water from a tank fitted on the top of the PV modul

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Maconi, G., F. Parente, S. Bollani, et al. "Factors affecting splanchnic haemodynamics in Crohn’s disease: a prospective controlled study using Doppler ultrasound." Gut 43, no. 5 (1998): 645–50. http://dx.doi.org/10.1136/gut.43.5.645.

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Background—Current knowledge on splanchnic haemodynamics in Crohn’s disease is limited.Aims—To investigate which features of Crohn’s disease affect splanchnic haemodynamics, and to establish whether portal vein (PV) and superior mesenteric artery (SMA) blood supply reflects clinical or biochemical activity of Crohn’s disease.Methods—Seventy nine patients with Crohn’s disease and 40 controls were evaluated by Doppler ultrasound (US). The mean velocity of PV and SMA flow, the volume of blood flow of the PV and SMA, and the resistance index of SMA were studied. A series of clinical, biochemical,

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Hunderi, J. O., C. R. Thompson, and O. A. Smiseth. "Deceleration time of systolic pulmonary venous flow: a new clinical marker of left atrial pressure and compliance." Journal of Applied Physiology 100, no. 2 (2006): 685–89. http://dx.doi.org/10.1152/japplphysiol.00705.2005.

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The curvilinearity of the atrial pressure-volume curve implies that atrial compliance decreases progressively with increasing left atrial (LA) pressure (LAP). We predicted that reduced LA compliance leads to more rapid deceleration of systolic pulmonary venous (PV) flow. With this rationale, we investigated whether the deceleration time ( tdec) of PV systolic flow velocity reflects mean LAP. In eight patients during coronary surgery, before extracorporeal circulation, PV flow by ultrasonic transit time and invasive LAP were recorded during stepwise volume loading. The tdec was calculated using

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Wang, Peng, Jingru Zhou, Xinfei Jin, et al. "The Impact of Offshore Photovoltaic Utilization on Resources and Environment Using Spatial Information Technology." Journal of Marine Science and Engineering 12, no. 5 (2024): 837. http://dx.doi.org/10.3390/jmse12050837.

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In recent years, the rapid development of the photovoltaic (PV) industry has resulted in a saturation of research on onshore PV power plant construction. However, current studies on the impact of marine PVs on the marine environment remain limited and scarce. In order to facilitate the implementation of carbon reduction goals and promote the sustainable development of the offshore PV industry, this study analyzes the environmental impact of PV sea-use resources based on spatial information technology in the western part of Gaotang Island. The findings show that the MIKE21FM model provides rela

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Rajanna, B. V., and Malligunta Kiran Kumar. "Chopper-Based Control Circuit for BESS Integration in Solar PV Grids." Energies 14, no. 6 (2021): 1530. http://dx.doi.org/10.3390/en14061530.

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The power delivered by photovoltaic (PV) arrays is dependent on environmental factors, and hence the availability and quality of power delivered by the PV array is low. These issues can be mitigated by integrating a battery energy storage system (BESS) with PV arrays. The integration of the BESS with PV arrays requires controller circuits to regulate power flow between the BESS, PV array, and the load. In this paper, a boost converter-based controller is proposed. The proposed controller has higher reliability and efficiency, and lower operational complexity. It improves the power quality and

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Prasetyo, Singgih Dwi, Aditya Rio Prabowo, and Zainal Arifin. "Investigation of Thermal Collector Nanofluids to Increase the Efficiency of Photovoltaic Solar Cells." International Journal of Heat and Technology 40, no. 2 (2022): 415–22. http://dx.doi.org/10.18280/ijht.400208.

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Active cooling technology of photovoltaic thermal (PVT) system allows lowering the working temperature to increase the efficiency of photovoltaic (PV) solar cells. In addition, the absorbed heat produces thermal energy simultaneously through the working fluid in the collector. Therefore, in this study, the modeling of the riser configuration of the PVT collector for cooling PV solar cells was carried out using a working fluid and varied mass flow rates. It is used to find the effect of working fluid and mass flow rate on the resulting efficiency. ANSYS 18.2 system analysis software is used to

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Riad, Ayoub, Houssam Amiry, Samira Touhtouh, Fouad Belhora, and Abdelowahed Hajjaji. "Enhancing Photovoltaic/Thermal system performance through innovative cooling tube design and water flow management." Matériaux & Techniques 112, no. 1 (2024): 104. http://dx.doi.org/10.1051/mattech/2024004.

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This research addresses the challenge of elevated temperatures impacting the performance of photovoltaic (PV) panels, considering both the dimensions of the cooling tube and the flow of water. A comprehensive analysis of various water flow rates is conducted using three tubes (tube 1, tube 2, and tube 3) with cross-sections of 100.27, 148.27, and 202.27 mm2 and 15, 11, and 9 loops, respectively. The numerical results reveal a significant 41.66% reduction in PV cell temperature, decreasing from 60 °C to 35 °C using tube 3 at a flow rate of 7.5 L/min, reflecting high electrical performance and e

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Hu, Wei, Shiwen Hou, Junfeng Zhu, Liang Li, Liang Cao, and Weigang Hao. "The outflow characteristics of PV water lifting systems based on multiple tracking strategies." Journal of Physics: Conference Series 2659, no. 1 (2023): 012001. http://dx.doi.org/10.1088/1742-6596/2659/1/012001.

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Abstract In order to clarify the problems of high failure rate, low efficiency, and low outflow rate of PV water pumping stations in pastoral areas due to large differences in resource conditions and poor equipment matching, this study uses the PV water supply model, establishes a pilot site for PV human storage water supply in pastoral areas, carries out research on the relationship between solar energy resources, water supply demand and power system of PV water pumping stations based on group observation tests in the field, and analyzes the PV system. We analyzed the relationship between dif

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Mohammadpour, Javad, Fatemeh Salehi, and Ann Lee. "Effective Cooling System for Solar Photovoltaic Cells Using NEPCM Impingement Jets." Thermo 2, no. 4 (2022): 383–93. http://dx.doi.org/10.3390/thermo2040026.

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Attention to photovoltaic (PV) cells to convert solar irradiation into electricity is significantly growing for domestic usage and large-scale projects such as solar farms. However, PV efficiency decreases on hot days. This paper proposes an effective cooling technique consisting of a 2% nano encapsulated phase change material (NEPCM) slurry and impinging jets (IJs) in a PV system. The impact of five influencing parameters on PV efficiency is studied using a multi-phase volume of fluid (VOF) model encompassing the effects of solar irradiation, latent heat, mass flow rate, number of nozzles, an

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Viúdez, Álvaro. "Elliptic and hyperbolic interior solutions of piecewise-constant potential vorticity geophysical vortices." Journal of Fluid Mechanics 696 (February 28, 2012): 301–18. http://dx.doi.org/10.1017/jfm.2012.39.

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AbstractElliptic and hyperbolic geopotential solutions, for a homogeneous distribution of potential vorticity (PV), are obtained via PV inversion in geophysical vortices. The flow in the axisymmetrical three-dimensional vortices is steady and horizontal, where the centripetal acceleration plus the Coriolis acceleration equals the pressure anomaly gradient term (gradient wind or cyclo-geostrophic balance). It is found that the family of geopotential solutions in the vortex interior is completely parameterized by the PV density in the vortex and the squared aspect ratio between the horizontal an

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Ilzig, Thomas, Katharina Stöckel, and Stefan Odenbach. "Experimental Investigations on the Effect of Axial Homogenous Magnetic Fields on Propagating Vortex Flow in the Taylor–Couette System." Materials 12, no. 24 (2019): 4027. http://dx.doi.org/10.3390/ma12244027.

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Experimental investigations of propagating vortex flow states (pV states) in a short Taylor–Couette system with asymmetric boundary conditions are presented. The flow state was established in a ferrofluid showing no magneto-viscous effect and was exposed to axial magnetic fields. It was found that the magnetic field led to a change in the spatial and temporal behavior of the pV state, indicating complex interactions between the flow field and magnetic field. A stepwise applied axial magnetic field destabilized the pV state, leading to an intermittent flow state. Gradually increasing the axial

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Tory, K. J., J. D. Kepert, J. A. Sippel, and C. M. Nguyen. "On the Use of Potential Vorticity Tendency Equations for Diagnosing Atmospheric Dynamics in Numerical Models." Journal of the Atmospheric Sciences 69, no. 3 (2012): 942–60. http://dx.doi.org/10.1175/jas-d-10-05005.1.

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Abstract This study critically assesses potential vorticity (PV) tendency equations used for analyzing atmospheric convective systems. A generic PV tendency format is presented to provide a framework for comparing PV tendency equations, which isolates the contributions to PV tendency from wind and mass field changes. These changes are separated into forcing terms (e.g., diabatic or friction) and flow adjustment and evolution terms (i.e., adiabatic motions). One PV tendency formulation analyzed separates PV tendency into terms representing PV advection and diabatic and frictional PV sources. In

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Yang, Meirong, Fei Qin, Yan Zhou, Yueping Yao, Zhonghua Lu, and Wei Chen. "Evaluation and clinical significance of contrast-enhanced ultrasound on changes in liver blood flow perfusion after TIPS surgery." Medicine 103, no. 17 (2024): e37899. http://dx.doi.org/10.1097/md.0000000000037899.

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To investigate the clinical value of contrast-enhanced ultrasound in the prediction of hepatic encephalopathy (HE) in patients with hepatitis B cirrhosis after intrahepatic portal-systemic shunt via jugular vein. In this retrospective study, we collected data from 75 patients with hepatitis B, cirrhosis, and portal hypertension who underwent jugular intrahepatic portosystemic shunt from February 2019 to February 2022. The diagnostic instrument used was the TOSHIBA Aplio500 color Doppler ultrasound with contrast-enhanced ultrasound capabilities. The trial group comprised 20 patients with HE wit

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Ayuse, T., N. Brienza, J. P. Revelly, C. P. O'Donnell, J. K. Boitnott, and J. L. Robotham. "Alternations in liver hemodynamics in an intact porcine model of endotoxin shock." American Journal of Physiology-Heart and Circulatory Physiology 268, no. 3 (1995): H1106—H1114. http://dx.doi.org/10.1152/ajpheart.1995.268.3.h1106.

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Septic shock decreases preload, increases splanchnic blood pooling and edema formation, and induces hepatic dysfunction. We hypothesized that the hemodynamic effects of endotoxemic shock on the portal venous (PV) and hepatic arterial (HA) vascular beds contribute to this picture. Multipoint pressure-flow relationships were generated to evaluate the slope (resistance or conductance) and effective back pressure (Pback) in each bed in an intact porcine model of endotoxemia. Slope and Pback were determined during endotoxemia over 300 min (n = 8) and compared with sham-treated control studies (n =

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