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Journal articles on the topic 'Power variation'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

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1

Said, Sayed M., and Bálint Hartmann. "Alleviation of Extremely Power and Voltage Variations Caused by Wind Power and Load Demand Using SMES." Periodica Polytechnica Electrical Engineering and Computer Science 63, no. 3 (2019): 134–43. http://dx.doi.org/10.3311/ppee.13718.

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Due to the high variations in wind speed and the continuing changes in load power demand (LPD), power and voltage at the point of common coupling (PCC) fluctuate according to the variations of injected wind power generation (WPG) and LPD simultaneously. Superconducting magnetic energy storage (SMES) plays a significant role in alleviating the power/voltage at PCC. This paper shows the impact of SMES in enhancing the performance of interconnected WPG system during high wind gust variations and the changes in LPD. WPG includes squirrel-cage induction generator (SCIG) type with a shunt-connected capacitor for improving the power factor. WPG, SMES and the load are located at PCC. Fuzzy logic control (FLC) is used with the DC-DC chopper to control the power exchange between AC system and SMES. FLC is designed where SMES can absorb/inject real power from/to the grid. On the other hand, reactive power is controlled to adjust the variation of PCC voltage. Two inputs are applied to the FLC; the summation of wind power variation and change of LPD as the first input and the variation of SMES current is the second one to control active power transferred between SMES and AC system. The suggested control approach of SMES is a fast response, as it successfully controlled the PCC voltage, line active and reactive powers during wind gusts and the variations of the load side.

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Trivedi, Tapankumar, Rajendrasinh Jadeja, and Praghnesh Bhatt. "Improved Direct Power Control of Shunt Active Power Filter with Minimum Reactive Power Variation and Minimum Apparent Power Variation Approaches." Journal of Electrical Engineering and Technology 12, no. 3 (2017): 1124–36. http://dx.doi.org/10.5370/jeet.2017.12.3.1124.

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3

Knighton, A. David. "Downstream variation in stream power." Geomorphology 29, no. 3-4 (1999): 293–306. http://dx.doi.org/10.1016/s0169-555x(99)00015-x.

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4

Barndorff-Nielsen, O. E., and N. Shephard. "Power Variation and Time Change." Theory of Probability & Its Applications 50, no. 1 (2006): 1–15. http://dx.doi.org/10.1137/s0040585x97981482.

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5

Depenbrock, M. "Variation power, variation currents: Physical background and compensation rules." European Transactions on Electrical Power 11, no. 5 (2001): 309–16. http://dx.doi.org/10.1002/etep.4450110505.

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6

Depenbrock, M. "Variation power, variation currents: Physical background and compensation rules." European Transactions on Electrical Power 12, no. 1 (2002): 73. http://dx.doi.org/10.1002/etep.4450120111.

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7

Hsiao, Chun Ching, Chin Yu Chang, An Shen Siao, and Jing Chih Ciou. "Melioration of Pyroelectric Cells for Power Conversion." Advanced Materials Research 479-481 (February 2012): 2199–205. http://dx.doi.org/10.4028/www.scientific.net/amr.479-481.2199.

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Trenching PZT material in a thicker PZT pyroelectric cell to improve the temperature variation rate was proposed in this study to enhance the efficiency of thermal energy-harvesting conversion by pyroelectricity. A thicker pyroelectric cell is beneficial in generating electricity pyroelectrically, but it opposes rapid temperature variations. Therefore, the PZT sheet was fabricated to produce deeper trenches to cause lateral temperature gradients induced by the trenched electrode, enhancing the temperature variation rate under homogeneous heat irradiation. When the trenched electrode type with an electrode width of 200 μm and a cutting depth of 150 μm was used to fabricate the PZT pyroelectric cell with a 200 μm thick PZT sheet, the temperature variation rate was improved by about 55%. Therefore, the trenched electrode design did indeed enhance the temperature variation rate and the efficiency of pyroelectric energy converters.

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8

Almohaimeed, Sulaiman A., and Mamdouh Abdel-Akher. "Power Quality Issues and Mitigation for Electric Grids with Wind Power Penetration." Applied Sciences 10, no. 24 (2020): 8852. http://dx.doi.org/10.3390/app10248852.

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Large penetration of wind energy systems into electric-grids results in many power quality problems. This paper presents a classification of power quality issues, namely harmonics and short-duration voltage variation observed due to the integration of wind power. Additionally, different techniques and technologies to mitigate the effect of such issues are discussed. The paper highlights the current trends and future scopes in the improvement of the interconnection of wind energy conversion systems (WECSs) into the grid. As the voltage variation is the most severe power quality issue, case studies have been presented to investigate this problem using steady-state time-series simulations. The standard IEEE test system namely IEEE 123-node test feeder and IEEE 30-node grid are solved under different operating conditions with wind power penetration. Typical daily load profiles of a substation in Riyadh, Saudi Arabia, and an intermittent wind power generation profile are used in all case studies. Mitigation of voltage variations due to wind intermittency is achieved using reactive power compensation of the interface inverter. The results show the effectiveness of these approaches to avoid voltage variation and excessive tap setting movements of regulators and keep the voltage within the desired operating conditions.

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9

WANG, XINSHENG, YIZHE HU, LIANG HAN, JINGHU LI, CHENXU WANG, and MINGYAN YU. "A LOW POWER AND VARIATION-INSENSITIVE CURRENT-MODE SIGNALING SCHEME." Journal of Circuits, Systems and Computers 22, no. 08 (2013): 1350068. http://dx.doi.org/10.1142/s0218126613500680.

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Process and supply variations all have a large influence on current-mode signaling (CMS) circuits, limiting their application on the fields of high-speed low power communication over long on-chip interconnects. A variation-insensitive CMS scheme (CMS-Bias) was offered, employing a particular bias circuit to compensate the effects of variations, and was robust enough against inter-die and intra-die variations. In this paper, we studied in detail the principle of variation tolerance of the CMS circuit and proposed a more suitable bias circuit for it. The CMS-Bias with the proposed bias circuit (CMS-Proposed) can acquire the same variation tolerance but consume less energy, compared with CMS-Bias with the original bias circuit (CMS-Original). Both the CMS schemes were fabricated in 180 nm CMOS technology. Simulation and measured results indicate that the two CMS interconnect circuits have the similar signal propagation delay when driving signal over a 10 mm line, but the CMS-Proposed offers about 9% reduction in energy/bit and 7.2% reduction in energy-delay-product (EDP) over the CMS-Original. Simulation results show that the two CMS schemes only change about 5% in delay when suffering intra-die variations, and have the same robustness against inter-die variations. Both simulation and measurements all show that the proposed bias circuits, employing self-biasing structure, contribute to robustness against supply variations to some extent. Jitter analysis presents the two CMS schemes have the same noise performance.

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10

Tudor, Constantin, and Maria Tudor. "Power variation of multiple fractional integrals." Central European Journal of Mathematics 5, no. 2 (2007): 358–72. http://dx.doi.org/10.2478/s11533-007-0001-9.

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11

Yeh, Chingwei, Yuan-Chang Chen, and Jinn-Shyan Wang. "Towards Process Variation-Aware Power Gating." IEEE Transactions on Very Large Scale Integration (VLSI) Systems 20, no. 11 (2012): 1929–37. http://dx.doi.org/10.1109/tvlsi.2011.2169435.

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12

Chandra, Saumya, Kanishka Lahiri, Anand Raghunathan, and Sujit Dey. "Variation-Aware System-Level Power Analysis." IEEE Transactions on Very Large Scale Integration (VLSI) Systems 18, no. 8 (2010): 1173–84. http://dx.doi.org/10.1109/tvlsi.2009.2021478.

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13

Devanathan, V. R., V. R. Devanathan, V. R. Devanathan, et al. "Variation-Tolerant, Power-Safe Pattern Generation." IEEE Design & Test of Computers 24, no. 4 (2007): 374–84. http://dx.doi.org/10.1109/mdt.2007.118.

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14

Ghysels, Eric, and Bumjean Sohn. "Which power variation predicts volatility well?" Journal of Empirical Finance 16, no. 4 (2009): 686–700. http://dx.doi.org/10.1016/j.jempfin.2009.03.002.

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15

A.E., Akin-Ponnle, Ponnle A.A., and Falaki S.O. "Power Variation with Electret Surface Potential and Frequency of Vibration in Vertical Vibration based Cantilever-Electret Micro-Power Generation." International Journal of Engineering Research 3, no. 12 (2014): 737–41. http://dx.doi.org/10.17950/ijer/v3s12/1206.

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16

Xing, Yanfeng, and Yansong Wang. "A new assembly variation analysis model based on the method of power balance for auto-body parts." Assembly Automation 34, no. 3 (2014): 296–302. http://dx.doi.org/10.1108/aa-02-2014-013.

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Purpose – The purpose of this paper is to propose a new assembly variation analysis model to analyze assembly variation for sheet metal parts. The main focus is to analyze assembly processes based on the method of power balance. Design/methodology/approach – Starting with issues in assembly variation analysis, the review shows the critical aspects of tolerance analysis. The method of influence coefficient (MIC) cannot accurately analyze the relationship between part variations and assembly variations, as the welding point is not a point but a small area. Therefore, new sensitivity matrices are generated based on the method of power balance. Findings – Here two cases illustrate the processes of assembly variation analysis, and the results indicate that new method has higher accuracy than the MIC. Research limitations/implications – This study is limited to assembly variation analysis for sheet metal parts, which can be used in auto-body and airplane body. Originality/value – This paper provides a new assembly variation analysis based on the method of power balance.

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17

Mittal, Vikas. "A Power Efficient Self Biased OTA Design Based on g_m/I_D Methodology with Considering Load Variation, Temperature Variation and Power Supply Variation." International Journal of Reconfigurable and Embedded Systems (IJRES) 7, no. 2 (2018): 104. http://dx.doi.org/10.11591/ijres.v7.i2.pp104-114.

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The present work addresses the design of power efficient fully self biased OTA using a design methodology based on the transistor characteristics. This analog module was analyzed, designed and prototyped in TSMS 0.35μm CMOS technology. Simulation results are presented, in order to validate the methodology. The OTA has Gain of 41.35 dB and 3db bandwidth of 138.73 kHz and the UGB of 12.40MHz with the current consumption of 65.50 μA. The circuit does not have need of any DC external biasing circuit, only need to apply VDD (3.3 V). Here self biasing has been introduced with power consumption of 216.15μW. The results have been taken with load variations, temperature variations, and power supply variations. This circuit used in real time high frequency applications as in RF communication.

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18

Elahipanah, Hossein, Arash Salemi, Benedetto Buono, Carl Mikael Zetterling, and Mikael Östling. "Process Variation Tolerant 4H-SiC Power Devices Utilizing Trench Structures." Materials Science Forum 740-742 (January 2013): 809–12. http://dx.doi.org/10.4028/www.scientific.net/msf.740-742.809.

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Silicon carbide (SiC) is one of the most attractive semiconductors for high voltage applications. The breakdown voltage of SiC-based devices highly depends on the variation of the fabrication process including doping of the epilayers and the etching steps. In this paper, we show a way to diminish this variability by employing novel trench structures. The influence of the process variations in terms of doping concentration and etching has been studied and compared with conventional devices. The breakdown voltage variation (ΔVBR) of 450 V and 2100 V is obtained for the ±20% variation of doping concentration of the devices with and without the trench structures, respectively. For ±20% variation in etching steps, the maximum ΔVBR of 380 V is obtained for the device with trench structures in comparison to 1800 V for the conventional structure without trench structures. These results show that the breakdown voltage variation is significantly reduced by utilizing the proposed structure.

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19

Uslan, I. "CO2 laser cutting: Kerf width variation during cutting." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 219, no. 8 (2005): 571–77. http://dx.doi.org/10.1243/095440505x32508.

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The kerf width size variation along a laser-cut section lowers the end product quality significantly. In the present study, CO2 laser cutting of mild steel is considered and the influence of laser power and cutting speed variations on the kerf width size is examined. A lump parameter analysis is introduced when predicting the kerf width size and an experiment is conducted to measure the kerf size and its variation during the cutting process. It is found that the power intensity at the workpiece surface influences significantly the kerf width size. The variation in the power intensity results in considerable variation in the kerf size during the cutting, which is more pronounced at lower intensities.

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20

Álvarez-Simón, Luis, Emmanuel Gómez-Ramírez, and María Sanz-Pascual. "Low-Power Highly Robust Resistance-to-Period Converter." Sensors 19, no. 1 (2018): 8. http://dx.doi.org/10.3390/s19010008.

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This paper presents a novel structure of Resistance- to-Period (R-T) Converter highly robust to supply and temperature variations. Robustness is achieved by using the ratiometric approach so that complex circuits or high accuracy voltage references are not necessary. To prove the proposed architecture of R-T converter, a prototype was implemented in a 0.18 μ m CMOS process with a single supply voltage of 1.8 V and without any stable reference voltage. Experimental results show a maximum ±1.5% output signal variation for ±10% supply voltage variation and in a 3–95 ° C temperature range.

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21

Yu, Byunggyu, Mikihiko Matsui, Junghun So, and Gwonjong Yu. "A high power quality anti-islanding method using effective power variation." Solar Energy 82, no. 4 (2008): 368–78. http://dx.doi.org/10.1016/j.solener.2007.08.006.

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22

Beunen, G., and M. Thomis. "Gene driven power athletes? Genetic variation in muscular strength and power." British Journal of Sports Medicine 40, no. 10 (2006): 822–23. http://dx.doi.org/10.1136/bjsm.2006.029116.

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23

Barndorff-Nielsen, Ole E., and Neil Shephard. "Realized power variation and stochastic volatility models." Bernoulli 9, no. 2 (2003): 243–65. http://dx.doi.org/10.3150/bj/1068128977.

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24

Manuel Corcuera, José, David Nualart, and Jeannette H. C. Woerner. "Power variation of some integral fractional processes." Bernoulli 12, no. 4 (2006): 713–35. http://dx.doi.org/10.3150/bj/1155735933.

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25

Short, T. A., A. Mansoor, W. Sunderman, and A. Sundaram. "Site variation and prediction of power quality." IEEE Transactions on Power Delivery 18, no. 4 (2003): 1369–75. http://dx.doi.org/10.1109/tpwrd.2003.817755.

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26

Bush, C. E., J. Schivell, S. S. Medley, and M. Ulrickson. "Toroidal variation of power radiated from TFTR." Review of Scientific Instruments 57, no. 8 (1986): 2078–80. http://dx.doi.org/10.1063/1.1138744.

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27

Xiao, Shu, and Edmund M. K. Lai. "VLIW instruction scheduling for minimal power variation." ACM Transactions on Architecture and Code Optimization 4, no. 3 (2007): 18. http://dx.doi.org/10.1145/1275937.1275942.

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28

Wetula, Andrzej, and Andrzej Bien. "New Measures of Power-Grid Voltage Variation." IEEE Transactions on Power Delivery 29, no. 3 (2014): 1020–27. http://dx.doi.org/10.1109/tpwrd.2014.2317234.

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29

de Voogt, Alex. "Variation and Aviation: Language and Statistical Power." Aviation Psychology and Applied Human Factors 2, no. 1 (2012): 36–37. http://dx.doi.org/10.1027/2192-0923/a000024.

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Large datasets from aviation accident databases allow for advanced statistical analyses. The results from one such analysis of helicopter night-time accidents show that this type of study is likely to separate the researcher from what can be understood in an aviation context.

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30

Liang, Haisen. "Variation in Parliamentary Power: Measurement and Explanation." Chinese Journal of International Review 03, no. 01 (2021): 2150005. http://dx.doi.org/10.1142/s2630531321500050.

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Democratization is a century-long hot issue in comparative politics. Parliament functions as the central system of democracy. Studies on comparative parliament can shed light on the politics of democratization. The core issue in comparative parliament is that how to explain variation in parliamentary power. This study reviews the burgeoning literature on parliamentary power and focuses on the measurement and explanation of variation in parliamentary power. A small but growing amount of studies provide three theoretical perspectives, namely political institution, the incentive structure of parliament members, and political party. All those propositions emphasize the significance of the political party. As for the relationship between the political party and committees in parliament, there are two conflicting versions: substitution thesis and agent thesis. Based on these reviews, this paper puts forward the issues of future research in comparative parliament.

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31

Ramkumar, P. V., R. S. Mishra, and Aman Khurana. "Variation in Maximum Power and Maximum Power point with different parameter analysis." INTERNATIONAL JOURNAL OF ADVANCED PRODUCTION AND INDUSTRIAL ENGINEERING 3, no. 1 (2018): 33–35. http://dx.doi.org/10.35121/ijapie201801128.

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Variation in Maximum power and Maximum power point i.e. voltage at which Maximum Power is observed with different parameters are studied. Parameters are insolation, temperature, series resistance, shunt resistance, and reverse saturation current of the diode. For this I-V and P-V characteristics with a variation of these parameters are analyzed. For finding out the Maximum PowerPoint, Perturb & Observe technique is used. Variation in these points is different with each parameter. All simulation work is done in MATLAB.

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32

Kini, P. Giridhar, R. C. Bansal, and R. S. Aithal. "Impact of voltage unbalance on the performance of three-phase induction motor." South Pacific Journal of Natural and Applied Sciences 24, no. 1 (2006): 45. http://dx.doi.org/10.1071/sp06007.

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Availability of quality power has become an important issue for industrial utilities due to frequent performance variations in process industries. Increase in the generating capacity has not kept up pace of power demand, which results into shortage of power supply and power system network is normally subjected to varying and unequal loads across the three phases. Continuous variation of single-phase loads on the power system network leads to voltage variation and unbalance, most importantly; the three-phase voltages tend to become asymmetrical in nature. Application of asymmetrical voltages to induction motor driven systems severely affects its working performance. This paper presents the effects of voltage variation and unbalance on the performance of an induction motor driven centrifugal pump with a case study.

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33

Mainil, Afdhal Kurniawan, Azridjal Aziz, and M. Akmal. "Portable Thermoelectric Cooler Box Performance with Variation of Input Power and Cooling Load." Aceh International Journal of Science and Technology 7, no. 2 (2018): 85–92. http://dx.doi.org/10.13170/aijst.7.2.8722.

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The thermoelectric module is a device that works by using the Peltier effect when electrical power supplied on it. In this study, the thermoelectric module is applied as thermoelectric cooler (TEC) using air cooling heat sink where cooling box capacity is 22 L. This paper experimentally investigates the thermal performance of thermoelectric cooler with a variation on input power and cooling load. The investigation has been conducted by three variations on input power (50.5W, 72.72W and 113.64W) and by two variations of the cooling load using mineral water (1440 mL and 2880 mL) with input power 113.64W. The box temperature achieved at input power 50.5W, 72.72W and 113.64W are 19.98oC, 19.77oC and 18.52oC, respectively. While at the cooling load of 1440 mL and 2880 mL, the temperature achieved in the box are 22.45oC and 23.32oC, respectively. The test results showed that in variation on the input power from low to high, the temperature in box becomes lower on high input power and causes the lower of COP, this is because more energy could be absorbed on high input power. In the cooling load variation, the greater the cooling load given in cooling box, then the longer the box temperature stability can be achieved because of more energy needed for decreasing the temperature of cooling box.

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34

Xing, Yan Feng, Xin Lu, and Yan Song Wang. "Assembling Variation Analysis Based on Power Balance Method for Sheet Metal Parts." Applied Mechanics and Materials 303-306 (February 2013): 2585–88. http://dx.doi.org/10.4028/www.scientific.net/amm.303-306.2585.

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Sheet metal parts are widely used in auto body and airplane body. As the method of influence coefficient cannot accurately analyze the relationship between part deviations and assembly variations, this paper proposes a new variation analysis model based on a method of power balance for sheet metal parts. The simple metal planes are loaded to fixtures according to the principle of “4-2-1”; and then variety of part deviations is analyzed during assembly process. The analysis shows that the welding guns do same work during welding process. Based on the above, this work establishes sensitive coefficient matrices between part deviations and assembly variations. Finally, two Z-shape sheet metal parts illustrate the assembling variation analysis process and the results indicate the accuracy of the method of power balance.

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35

Zhang, Zhaobo, Xrysovalantis Kavousianos, Krishnendu Chakrabarty, and Yiorgos Tsiatouhas. "Static Power Reduction Using Variation-Tolerant and Reconfigurable Multi-Mode Power Switches." IEEE Transactions on Very Large Scale Integration (VLSI) Systems 22, no. 1 (2014): 13–26. http://dx.doi.org/10.1109/tvlsi.2012.2233505.

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36

Imen, Labed, and Labed Djamel. "Power flow variation based on extreme learning machine algorithm in power system." International Journal of Power Electronics and Drive Systems (IJPEDS) 10, no. 3 (2019): 1244. http://dx.doi.org/10.11591/ijpeds.v10.i3.pp1244-1254.

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<p>The main focus of this paper is a study that empowers us to understand how the temperature variation affects the transmission line resistance and as a result the power flow analysis with a specific end goal to assess losses in the electrical network. The paper is composed of two sections; the first part is a power flow study under normal conditions utilizing the neural network approach while the second investigated extreme learning machine algorithm efficiency and exactitude. Extreme learning machine algorithm has been used to settle several complications in power system: load forecasting, fault diagnosis, economic dispatch, security, transient stability; Thus, we proposed to study this technique to figure out this sort of complex issue.</p>The study was conducted for IEEE 30 bus test system. The simulation results are exposed and analyzed in detail at the end of this paper.

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37

Laković, M. S., D. Mitrović, V. Stefanović, and M. Stojiljković. "Coal-fired Power Plant Power Output Variation Due to Local Weather Conditions." Energy Sources, Part A: Recovery, Utilization, and Environmental Effects 34, no. 23 (2012): 2164–77. http://dx.doi.org/10.1080/15567036.2010.495973.

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38

Chen, Meng-Jen, Yu-Chi Wu, Guo-Tsair Liu, and Jong-Fang Chen. "Dynamic behavior of a distributed incinerator power system under output power variation." International Journal of Numerical Modelling: Electronic Networks, Devices and Fields 28, no. 1 (2014): 65–77. http://dx.doi.org/10.1002/jnm.1984.

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39

Sasaki, T., E. Shimomura, and K. Yamada. "Variation of power losses with stresses in amorphous sheets for power applications." IEEE Transactions on Magnetics 23, no. 5 (1987): 3587–89. http://dx.doi.org/10.1109/tmag.1987.1065764.

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40

Wu, Yunfeng, Masaru Higuchi, Yukio Takeda, and Koichi Sugimoto. "Development of a Power Assist System of a Walking Chair (Proposition of the Speed-Torque Combination Power Assist System)." Journal of Robotics and Mechatronics 17, no. 2 (2005): 189–97. http://dx.doi.org/10.20965/jrm.2005.p0189.

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In this paper, we discussed the mechanism and control strategy of the power assist systems for the walking chair and proposed a new power assist system. The composition of the leg mechanism, which generates the motion for periodic walk at horizontal plane by driving the input link at constant velocity, and driving torque of the leg mechanism of the prototype walking chair were presented. Velocity variation in user’s cranking operation was also presented. We proposed a system architecture for driving the walking chair by human’s and assisting actuator’s powers. We proposed a hybrid power assist system with two assisting actuators for reducing the effects of variations in user’s driving velocity and in driving torque of the leg of the walking chair on the output velocity of the walking chair and on user’s discomfort.

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41

Fitriansyah, Fitriansyah, Slamet Wahyudi, and Winarto Winarto. "Pengaruh Kedalaman Sudu Mangkok terhadap Unjuk Kerja Turbin Kinetik." Jurnal Rekayasa Mesin 11, no. 3 (2020): 323–29. http://dx.doi.org/10.21776/ub.jrm.2020.011.03.3.

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The purpose of this study was to determine the effect of depth variations of the bowl blade on the performance of kinetic turbines. The test has conducted experimentally on a laboratory scale. In this study three vertical shaft, kinetic turbines were used with blade depth variations of 2 cm, 3 cm, and 4 cm. Each turbine will be tested on different rotation variations and flowrate variations. Parameters such as turbine power and efficiency will be determined based on the results of measurements of water velocity, water level, and braking load. The results showed that the depth of the bowl blade affected the performance of the kinetic turbine. The highest kinetic turbine performance was obtained in the turbine with 4 cm blade depth variation, followed by the turbine with 3 cm blade depth variation and the lowest turbine performance was obtained at 2 cm blade depth variation. The maximum performance of the turbine is obtained at 4 cm blade depth variation at 80 rpm and 65 m3/h water discharge, where the power generated is 13.2 Watts and efficiency is 34.5%.

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42

Liu, Guangying, and Xinsheng Zhang. "Power variation of fractional integral processes with jumps." Statistics & Probability Letters 81, no. 8 (2011): 962–72. http://dx.doi.org/10.1016/j.spl.2011.01.016.

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43

Barndorff-Nielsen, Ole E., José Manuel Corcuera, and Mark Podolskij. "Power variation for Gaussian processes with stationary increments." Stochastic Processes and their Applications 119, no. 6 (2009): 1845–65. http://dx.doi.org/10.1016/j.spa.2008.09.004.

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44

Taylor, K., J. B. Cronin, N. Gill, D. W. Chapman, and J. M. Sheppard. "Warm-Up Affects Diurnal Variation in Power Output." International Journal of Sports Medicine 32, no. 03 (2011): 185–89. http://dx.doi.org/10.1055/s-0030-1268437.

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45

Deng, Z. "Variation of above-threshold ionisation power law behaviour." Journal of Physics B: Atomic and Molecular Physics 18, no. 10 (1985): L287—L291. http://dx.doi.org/10.1088/0022-3700/18/10/005.

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46

Deng, Z., and J. H. Eberly. "Variation of above-threshold ionisation power law behaviour." Journal of Physics B: Atomic and Molecular Physics 18, no. 20 (1985): 4185. http://dx.doi.org/10.1088/0022-3700/18/20/521.

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47

SHEN, Guangjun, Litan YAN, and Junfeng LIU. "Power Variation of Subfractional Brownian Motion and Application." Acta Mathematica Scientia 33, no. 4 (2013): 901–12. http://dx.doi.org/10.1016/s0252-9602(13)60049-1.

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King, Alex, and Utz Roedig. "Differentiating Clear Channel Assessment Using Transmit Power Variation." ACM Transactions on Sensor Networks 14, no. 2 (2018): 1–28. http://dx.doi.org/10.1145/3209044.

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Onea, Florin, and Liliana Rusu. "Wave Power Variation near the Romanian Coastal Waters." E3S Web of Conferences 103 (2019): 01006. http://dx.doi.org/10.1051/e3sconf/201910301006.

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Abstract:

In the present work, the relationship between Romanian wave power and the distance to the shoreline is evaluated, by taking also into account the performances of some wave energy converters. Several reference sites located on northern, centre and southern part of this area were taken into account, the wave energy being assessed at 5 km, 15 km and 30 km from the shore. More important resources were noticed close to the Vama Veche (in south) were an average of 4.27 kW/m is reported offshore. As we go from shore to offshore, the wave variations may reach a maximum of 7.7% in the case of the Navodari site (centre), while a 3.3% is expected for Vama Veche. In the case of the wave generators, three types of systems (Seabased, Pelamis and Wave Dragon) were considered, that cover a rated capacity ranging from 15 kW to 7000 kW. For the Saint George s ite (north), the power production is insignificant being located close to zero, while in terms of the capacity factor a maximum of 0.12% may be expected from the Seabased system. The capacity factor significantly increases as we go to south, being reported during winter time values close to 3% for Pelamis system or 6% in the case of Seabased, respectively.

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Patnaik, Swagat, Basudev Biswal, Dasika Nagesh Kumar, and Bellie Sivakumar. "Regional variation of recession flow power-law exponent." Hydrological Processes 32, no. 7 (2018): 866–72. http://dx.doi.org/10.1002/hyp.11441.

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