Relevant bibliographies by topics / Rippon Lea

Academic literature on the topic 'Rippon Lea'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Rippon Lea"

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Hamza, M. A., G. P. Riethmuller, and W. K. Anderson. "Experimental subsoiling by in-line shallow and deep tines." Soil Research 51, no. 6 (2013): 477. http://dx.doi.org/10.1071/sr13129.

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Conventional soil ripping has high fuel consumption because it involves high draft force and may produce large soil clods. This experiment compares the use of shallow leading tines ahead of the main tine with use of a conventional single-tine ripper. The study showed that attaching a single, shallow leading tine ahead of, and in line with, the main tine and 25–40% shallower in depth gave the greatest significant decrease in specific draft force. This led to a fuel reduction from 13.6 to 11.5 L/ha, or a saving of 15% when ripping a moist loamy sand soil to 330 mm depth. Attaching more than one shallow lead tine ahead of the ripper did not significantly affect specific draft forces, whether the shallow lead tines were in line or offset. Other advantages of using the shallow leading tine ripper over the conventional ripper are: improved soil tilth by significantly decreasing soil clod size; potentially a wider moisture range for ripping the soil (as soil clods are smaller and drier soil increases clod size) thus increasing the time available for the operation; and decreased depreciation of ripping components.
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Jannah, Roudlotul, Ari Murtono, and Siswoko Siswoko. "Desain dan Analisis Ripple Tegangan dan Arus Luaran Peralatan Baterai Lead Acid." Jurnal Elektronika dan Otomasi Industri 4, no. 3 (November 27, 2020): 33. http://dx.doi.org/10.33795/elkolind.v4i3.120.

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Proses pengisian baterai khususnya lead acidpasti akan timbul ripple tegangan dan arus pada keluaranoutputnya. Dalam penelitian ini, ripple dianalisa untukmelihat seberapa besar pengaruhnya terhadap proses pengisianaccu. Untuk menghasilkan ripple tegangan dan arus yangdiinginkan, pemakaian filter LC dalam topologi buck-boostconverter harus diatur dan dianalisa.Penelitian ripple initergantung dari pemakaian filter LC yang otomatis akanmenimbulkan rugi-rugi. Analisis penelitian ripple inidiperlihatkan melalui hasil percobaan.
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Ruck, Sebastian, Frederik Arbeiter, and Torben Petri. "Laser-Doppler-Anemometrie-Messungen in einem quadratischen Kanal mit eng beieinanderliegenden Rippen an einer Wand." tm - Technisches Messen 89, no. 3 (February 2, 2022): 158–67. http://dx.doi.org/10.1515/teme-2021-0121.

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Zusammenfassung In der vorliegenden Arbeit werden Ergebnisse von Laser-Doppler-Anemometrie (LDA)-Geschwindigkeitsmessungen in einem einseitig mit transversal orientierten Rippen-Rauheiten strukturierten quadratischen Kanal für die Strömung mit einer Reynolds-Zahl von Re H = 5 , 0 · 10 4 {\mathit{Re}_{H}}=5,0\cdot {10^{4}} vorgestellt. Das Rippenabstand-Rippenhöhe-Verhältnis war 3 und die Verblockungsrate betrug 6 , 7 % 6,7\hspace{0.1667em}\% . Es werden Verteilungen der mittleren Geschwindigkeiten, Reynolds-Spannungen sowie Triple-Geschwindigkeit-Korrelationen präsentiert. Die Ergebnisse zeigen die Entwicklung einer dreidimensionalen Sekundärströmung oberhalb der Rippen, wodurch sich ein schwach advektiver wandnormaler Fluidtransport zwischen der rippennahen Strömung und der Kanalkernströmung einstellt. Der Einfluss der Rippen-Rauheiten auf das turbulente Strömungsgeschehen und die einhergehenden turbulenten Austauschvorgänge ist jedoch auf die unmittelbare Rippennähe begrenzt. Die anhand der statistischen Momente höherer Ordnung beschriebenen rippeninduzierten instationären Strömungsvorgänge sowie der diffusive Transport treten oberhalb der Rippen nur in einem schmalen Band auf.
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Fernando Menke, Maikel, José Marcos Alonso Álvarez, Rodrigo V. Tambara, and Álysson Raniere Seidel. "HYBRID DUAL-LOOP CONTROL FOR CURRENT REGULATION AND LOW-FREQUENCY RIPPLE REJECTION IN LED DRIVERS." Eletrônica de Potência 26, no. 03 (September 8, 2021): 315–27. http://dx.doi.org/10.18618/rep.2021.3.0010.

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Sakong, Suk-Chin, Hyun-Seo Park, Jeong-Il Kang, and Sang-Kyoo Han. "Power Factor Correction LED Driver with Small 120Hz Current Ripple." Transactions of the Korean Institute of Power Electronics 19, no. 1 (February 20, 2014): 91–97. http://dx.doi.org/10.6113/tkpe.2014.19.1.91.

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Kang, Hyemin, Nazareno Donato, and Florin Udrea. "Effect of Pillar Ripple on Static and Dynamic Trade-Offs in Superjunction MOSFETs." IEEE Electron Device Letters 41, no. 5 (May 2020): 753–56. http://dx.doi.org/10.1109/led.2020.2985203.

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Chaturvedi, Shivam, Mengqi Wang, Yaoyu Fan, Deepak Fulwani, Guilherme Vieira Hollweg, Shahid Aziz Khan, and Wencong Su. "Control Methodologies to Mitigate and Regulate Second-Order Ripples in DC–AC Conversions and Microgrids: A Brief Review." Energies 16, no. 2 (January 10, 2023): 817. http://dx.doi.org/10.3390/en16020817.

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Second-order ripples occur in the voltage and current during any DC–AC power conversion. These conversions occur in the voltage source inverters (VSIs), current source inverters (CSIs), and various single-stage inverters (SSIs) topologies. The second-order ripples lead to oscillating source node currents and DC bus voltages when there is an interconnection between the AC and DC microgrids or when an AC load is connected to the DC bus of the microgrid. Second-order ripples have various detrimental effects on the sources and the battery storage. In the storage battery, they lead to the depletion of electrodes. They also lead to stress in the converter or inverter components. This may lead to the failure of a component and hence affect the reliability of the system. Furthermore, the second-order ripple currents (SRCs) lead to ripple torque in wind turbines and lead to mechanical stress. SRCs cause a rise in the temperature of photovoltaic panels. An increase in the temperature of PV panels leads to a reduction in the power generated. Furthermore, the second-order voltage and current oscillations lead to a varying maximum power point in PV panels. Hence, the maximum power may not be extracted from it. To mitigate SRCs, oversizing of the components is needed. To improve the lifespan of the sources, storage, and converter components, the SRCs must be mitigated or kept within the desired limits. In the literature, different methodologies have been proposed to mitigate and regulate these second-order ripple components. This manuscript presents a comprehensive review of different effects of second-order ripples on different sources and the methodologies adopted to mitigate the ripples. Different active power decoupling methodologies, virtual impedance-based methodologies, pulse width modulation-based signal injection methodologies, and control methods adopted in distributed power generation methods for DC microgrids have been presented. The application of ripple control methods spans from single converters such as SSIs and VSIs to a network of interconnected converters. Furthermore, different challenges in the field of virtual impedance control and ripple mitigation in distributed power generation environments are discussed. This paper brings a review regarding control methodologies to mitigate and regulate second-order ripples in DC–AC conversions and microgrids.
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Sarracino, Diego, Alice Garavaglia, Emanuela S. Gritti, Laura Parolin, and Marco Innamorati. "Dropout from cognitive behavioural treatment in a case of bulimia nervosa: The role of the therapeutic alliance." Research in Psychotherapy: Psychopathology, Process and Outcome 16, no. 2 (January 12, 2014): 71–84. http://dx.doi.org/10.4081/ripppo.2013.138.

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Despite the refinement of the cognitive treatment for eating disorders, relatively high dropout rates represent a major problem for therapists and researchers. This study investigated the case of a patient with a diagnosis of bulimia nervosa, who dropped out of outpatient CBT after 28 weekly sessions. In addition to standard clinical outcome assessment, we examined how patient's psychological functioning and therapeutic alliance changed across sessions by applying observer-rating scales to the therapy transcripts. Although the patient reported some improvement at the six-month retest, observer ratings showed persistence of impaired functioning and frequent ruptures in the patient-therapist relationship throughout the treatment. We concluded that a thorough examination of the therapy process might help to understand the factors that lead to premature treatment termination.
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Kwon, Min-Jun, and Woo-Cheol Lee. "A Study on the Control Technique of LLC Resonant Converter for LED Driver with 120Hz Ripple Current." Transactions of The Korean Institute of Electrical Engineers 68, no. 12 (December 31, 2019): 1557–65. http://dx.doi.org/10.5370/kiee.2019.68.12.1557.

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Wang, Songda, Danyang Bao, Gustavo Gontijo, Sanjay Chaudhary, and Remus Teodorescu. "Modeling and Mitigation Control of the Submodule-Capacitor Voltage Ripple of a Modular Multilevel Converter under Unbalanced Grid Conditions." Energies 14, no. 3 (January 28, 2021): 651. http://dx.doi.org/10.3390/en14030651.

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A modular multilevel converter’s (MMC’s) submodule (SM)-capacitor voltage will increase under unbalanced grid conditions. Depending on the imbalance level, the voltage ripple can be considerably high, and it can exceed the pre-defined safe limits. If this occurs, the converter will trip, which can lead to serious stability problems for the grid. This paper first proposes an analytical solution for deriving the three-phase imbalanced SM ripple of an MMC under an unbalanced grid. With this analytical tool, the imbalance mechanism of the SM voltage ripple can be easily understood. What is more, the symmetrical component method is first applied to analyze the three-phase SM capacitor ripple, and the positive-/negative-/zero-sequence components of the three-phase SM voltage ripple are easily identified by the proposed analytical method. Then, based on this powerful analytical tool, the proper circulating-current profile to be injected can be obtained, allowing for the right compensation of the voltage ripple. Based on this approach, two new voltage ripple compensation methods are proposed in this paper. Simulations were carried out to validate the analytical description of the submodule-capacitor voltage ripple proposed in this paper. Moreover, simulation and experimental results are provided to validate the new compensation techniques introduced in this paper.
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Dissertations / Theses on the topic "Rippon Lea"

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Soares, Guilherme Márcio. "Capacitance reduction in off-line led drivers by using active ripple compensation techniques." Universidade Federal de Juiz de Fora (UFJF), 2017. https://repositorio.ufjf.br/jspui/handle/ufjf/6044.

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CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Este documento apresenta uma nova técnica para a minimização da ondulação de baixa frequência, típica de conversores para o acionamento de LEDs alimentados a partir da rede elétrica. Esta estratégia baseia-se na modulação em baixa frequência da razão cíclica do conversor de modo que a ondulação de corrente possa ser reduzida e, consequentemente, as capacitâncias de filtragem do conversor possam ser minimizadas. Esta técnica foi desenvolvida para a aplicação em conversores de malha única, como é o caso de conversores de estágio único ou mesmo dois estágios integrados. A modulação da razão cíclica é projetada de maneira que o comportamento de baixa frequência das principais variáveis do conversor seja alterado, permitindo uma redução da ondulação da corrente de saída ao custo de um incremento cotrolado no conteúdo harmônico da corrente de entrada. Duas possíveis metodologias para a implementação da técnica proposta são discutidas ao longo do trabalho. A primeira envolve a injeção de harmônicas específicas no sinal da razão cíclica do conversor através de ramos adicionais na estrutura de controle. Esta abordagem foi aplicada para projetar um controlador de LEDs baseado em um conversor flyback e também em uma topologia integrada baseada na conexão cascata de dois conversores Buck-boost. Este estudo inicial foi expandido para outros conversores e uma análise generalizada acerca da influência da modulação da razão cíclica no comportamento de controladores de LED alimentados a partir da rede elétrica é apresentada. A segunda metodologia para a implementação da compensação ativa da ondulação de baixa frequência do conversor é baseada na otimização de um controlador proporcional-integral a fim de que tal elemento influencie não só no comportamento dinâmico do circuito, mas também na característica de baixa frequência do conversor. Por fim são discutidas as principais contribuições da tese e algumas propostas para trabalhos futuros são apresentadas
This document presents a novel approach for low-frequency output current ripple minimization in off-line light-emitting diode (LED) drivers. This strategy is based on the large-signal modulation of the duty-cycle so that the output ripple can be reduced and, consequently, the required filtering capacitances of the converter can be somehow decreased. This technique is devised to be used on converters in which a single control loop is employed, such as off-line single-stage or integrated converters. The duty-cycle modulation is used to change the shape of the main waveforms of the converter, especially the input and output currents. This allows for a reduction of the output current peak-to-peak ripple while the harmonic content of the input current is increased but kept within the limits imposed by the IEC standard. Two methodologies for implementing the proposed technique are discussed along the text. The first one is related to the injection of harmonic components to the duty cycle signal by means of additional branches inserted in the conventional control structure. This approach was applied to design an off-line flyback-based LED driver and also a circuit based on the Integrated Double Buck-boost converter. This first study was expanded to other topologies and a generalized analysis regarding the impact of the duty cycle modulation on off-line converters is then presented. The second methodology for implementing the ripple compensation is based on the optimization of a proportional-integral controller so that this element is designed to influence not only in the dynamic behavior of the circuit, but also in its low-frequency characteristic. Finally, the main contributions of this work are discussed and the proposals for future works are presented.
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Aipperspach, Andrew David. "Utilizing Pruning and Leaf Removal to Ripen Grapes and Encourage Cold Tolerance in North Dakota." Thesis, North Dakota State University, 2013. https://hdl.handle.net/10365/27093.

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Experiments were conducted at North Dakota vineyards in 2011 and 2012. Pruning limited vines to a specific number of primary buds while leaf removal exposed ripening grape clusters to increased sunlight. Variables included length of growth prior to dormant pruning, weight of growth, rate of ripening, total weight of harvested grapes, weight per grape cluster, berry weight, number of clusters per vine, soluble solid concentration (?Brix), titratable acidity (TA), and pH. Data were analyzed as a CRD with a factorial arrangement. Analysis showed varied significance with pruning and shade leaf removal interacting with specific cultivar traits to influence growth, grape yield, and grape quality. Impact on yield was minimal, treatment impacts on grape quality showed potential for use of shade leaf removal as means of decreasing titratable acidity levels in harvested grapes. Research supports the use of pruning and shade leaf removal treatments to influence grape production.
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Almeida, Pedro Santos. "Conversor integrado SEPIC buck-boost aplicado ao acionamento de LEDs de potência em iluminação pública." Universidade Federal de Juiz de Fora, 2012. https://repositorio.ufjf.br/jspui/handle/ufjf/2037.

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CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Este trabalho apresenta um estudo acerca da alimentação de diodos emissores de luz (LEDs) a partir da rede elétrica empregando conversores eletrônicos com correção do fator de potência. O estudo visa o desenvolvimento de um conversor que pode ser aplicado em iluminação pública, que atenda às demandas típicas de alto fator de potência, alta eficiência, reduzido número de componentes, baixa distorção harmônica da corrente de entrada e possa atingir uma elevada vida útil, através da substituição de capacitores eletrolíticos no circuito de potência por capacitores de filme. É proposta uma nova topologia de conversor para implementar tal acionamento, baseado em uma integração entre dois estágios, que passam a compartilhar um único interruptor estático. Os conversores SEPIC e buck-boost operando em modo de condução descontínua (DCM) são escolhidos para compor cada um destes estágios, atuando o primeiro na correção do fator de potência e o segundo na regulação de corrente na carga. Uma metodologia de projeto que visa excluir os capacitores eletrolíticos é desenvolvida, partindo de dados fotométricos que permitem aplicar nos LEDs uma ondulação limite de 50% em amplitude, sem causar prejuízos ao seu desempenho fotométrico. Um protótipo de 70 W é apresentado, cujos resultados experimentais demonstram alto fator de potência (0,998), baixa distorção harmônica de corrente (3,2%) e alta eficiência (90,2%), enquanto empregando somente capacitores de filme metalizado, de longa vida útil, no circuito de potência. Uma abordagem das possibilidades de se implementar um controlador digital para o novo conversor proposto é feita, partindo de um modelo de pequenos sinais para o conversor operando em DCM.
This work presents a study regarding the feeding of light-emitting diodes (LEDs) from mains (grid power) employing electronic drivers with power factor correction. The study aims the development of an LED driver which can be applied to public and street lighting, complying with the typical demands of high power factor, high efficiency, reduced component count, low total harmonic distortion (THD) of input current and which can attain long lifespan, through the substitution of electrolytic capacitors within the power circuit by film capacitors. It is proposed a new converter topology to implement such driver, based on an integration between two stages which share a common static power switch. The SEPIC and buck-boost converters operating in discontinuous conduction mode (DCM) are chosen to make up each of these two stages, the first acting as a power factor corrector and the second as a load currentcontrolling stage. A design methodology which aims the exclusion of electrolytic capacitors is developed, stemming from photometric data which allow the LEDs to be operated with current ripples up to 50% in amplitude, without causing any harm to their photometric performance. A 70 W prototype is presented, whose experimental results demonstrate high power factor (0.998), low current harmonic distortion (3.2%) and high efficiency (90.2%), while employing only long-life metallised-film capacitors on the power circuit. An approach to the possibilities of implementing a digital controller for the proposed novel converter is done, starting from a small-signal model for the converter operating in DCM.
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Lin, Zhong-Rong, and 林忠榮. "LED Driver with Current Ripple Suppression." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/12913911454205015505.

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碩士
國立臺灣海洋大學
電機工程學系
103
This thesis studies a LED driver with current ripple suppression. In order to achieve power factor correction, the output current closed-loop crossover frequency must be lower than 100 to 120Hz. Therefore, the output current exists 100 to 120Hz current ripple which results in 100 to 120Hz flickering issue on LED load. With current ripple suppression can improve the above issue, and its improved performance is analyzed and compared under different switching frequency design.
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LIU, KUN-JIE, and 劉坤杰. "Dimmable LED Driver with Low-Frequency Current Ripple Improved." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/zvk7mf.

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碩士
國立臺北科技大學
電機工程系
107
In this thesis, a dimmable LED driver with low-frequency current ripple improved is developed. This driver is designed with a single-stage flyback converter, and employs a controller with high voltage startup and power factor correction to reduce startup time, to increase power factor and to reduce input current total harmonic distortion, so that the international standards can be met. The low-frequency current ripple improvement circuit, together with a secondary-side current feedback circuit, is composed of a transistor and an operational amplifier. The current feedback circuit can effectively reduce the output low-frequency current ripple. When the voltage across the LED string is decreased, the output of the flyback converter possesses automatic voltage adjustment so as to reduce the power loss of the transistor. As for the dimming circuit, it is mainly composed of an operational amplifier, the current flowing through the LED string can be varied by adjusting the reference voltage of the feedback controller. A 30W LED driver, with input voltage range from 90Vrms to 277Vrms and with 24 LEDs in series used as a load, is designed, and then the feasibility of this circuit is verified by experimental results.
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Lai, Chung-Yu, and 賴忠佑. "LED Driver with Low-Frequency Ripple Suppressed and Dimming Efficiency Improved." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/hsv55q.

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碩士
國立臺北科技大學
電力電子產業研發碩士專班
99
In this thesis, a single-stage power-factor-corrected (PFC) flyback converter is used as the main power stage, which is controlled by a control IC named L6562 so as to driver LED strings of about 100W. Since the output voltage of the converter possesses a double line frequency ripple, one energy recycling circuit without any control is added to make the instantaneous output power close to the instantaneous input power by changing the instantaneous output power, so as to reduce the energy stored/released in the output capacitor and hence to reduce the output voltage ripple with the double line frequency. Therefore, such a converter not only can provide a feedback control signal for the control IC, but also can supply the LED strings with a well-regulated voltage source such that the effect of the low-frequency ripple on the color, luminance, life and stability of the LED can be reduced. For the dimming circuit to be considered, the field programmable gate array (FPGA) is used as a control kernel of LED dimming. At the same time, the gate voltage detecting circuit is added to the linear current regulator, so as to achieve LED dimming. According to the dimming command and the variation in gate voltage, the voltage reference command for the flyback converter is dynamically adjusted via a varying value created from FPGA, so as to make the voltage across the MOSFET reduced as the LED string is dimmed down. To speak lucidly, as the variation in load or the variation in temperature leads to the variation in equivalent forward voltage of the LED string, the proposed dimming method can make the voltage across the MOSFET operated at as near the knee point of the MOSFET output characteristic curve as possible, so as to reduce the power loss in the MOSFET and hence to increase the efficiency of the overall system. In this paper, first of all, the associated mathematical deduction of the proposed topology is given, secondly some simulation results are provided to verify its feasibility, and finally some experimental results are offered to demonstrate its effectiveness.
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Chen, PO-YEN, and 陳伯彥. "Novel RPSM Integrated LED Drivers with Low Output Ripple and Dimming Capability." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/djuf4p.

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博士
國立臺灣科技大學
電機工程系
107
A novel circuit called resonant passive switch module (RPSM) is proposed, the presented circuit is then integrated into LED drivers to enhance their performance. No controlled active switch, electrolytic capacitors, and auxiliary power supply are required in the proposed LED driver. The advantages of the proposed driver include long lifetime, high efficiency and recyclability. The operation principles of RPSM circuit are first analyzed. Theoretical analysis of the proposed LED driver is made, and some design guidelines are provided. The RPSM circuit is applied to the passive power factor correction (PFC) circuit, and the waveform of the input current is changed by its operation so that the higher order harmonics can be reduced. Thus, both the power factor and double line frequency ripple of the output current can be improved. In addition, the RPSM circuit is also applied to the buck-boost circuit. No additional active switch is needed, and the efficiency is not affected. In order to lower the output current ripple, the buck-boost circuit is operated in discontinuous mode. A prototype system of 50W rating is also constructed, and experimental results confirm the validity of the proposed LED driver. It can be seen that the resonance of the RPSM circuit is realized by the capacitor and inductor, and the diode can be operated properly; therefore, the structure can be changed. The performance of the circuit can be improved by additional operation modes, and the control is able to be simplified.
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You, Liu-You, and 游劉佑. "A High Stability and Low Ripple Dimmable Multi-Channel Boost White LED Driver." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/46647180507518498082.

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碩士
國立臺灣海洋大學
電機工程學系
101
In recent years, the global green environmental consciousness is growing fast, we have realized that environmental protection has great impact on the world. Owing to the environmental awareness, the light-emitting diode (LED) has become an indispensable element to achieve environmental protection. Many of today's portable electronics products use light emitting diodes to replace the traditional electronic components. Because most portable electronic products cannot drive multiple pieces of white LEDs, the products must have boost circuit inside to raise the LED supply voltage. This thesis uses the TSMC Mixed-Signal 2P4M Polycide 3.3/5V process provided by National Chip Implementation Center (CIC) to design and implement multi-channel dimmable white light emitting diode driver circuit. The driver uses constant current pulse width modulation technology. The light emitting diode current is pulse presented, by adjusting the pulse width to change the average value of the light emitting diode forward current. The system architecture of this thesis has combined the dimming driver circuit with a DC-DC switching inductive boost converter on the same chip. The overall system has selected voltage mode control. The boost converter input voltage is 3.6 ~ 4.2V, and the output voltage is 5V. This system also uses over-current protection mechanism to ensure the boost converter to work properly, and over-voltage protection mechanism to prevent the feedback voltage from being too large to burn the light-emitting diodes. The chip layouts of analog circuits and digital circuits have separated the supply voltage source and ground line to prevent mutual interference. The chip area is 1.855mm x 1.831mm. The whole wafer is in steady state during the measurement and the internal circuits are in normal operation. The system efficiency is 81%.
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CHEN, ANG-TUNG, and 陳昂彤. "Single-Inductor Multiple-Output Dimmable Boost-Type LED Driver with Input Current Ripple Cancelation." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/wkv2su.

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碩士
國立臺北科技大學
電機工程系
107
LED lighting has many advantages such as no mercury, long life, and small size, so that it is widely used in daily life. A single-inductor multiple-output dimmable boost-type LED driver with input current ripple cancelation is presented in this thesis. The driver uses a boost converter with a single-inductor multiple-output architecture and this architecture uses discontinuous conduction mode to solve the cross regulation problem of single-inductor multiple-output, and each LED string is independently controlled, no current regulation is used for preventing from additional power loss. In addition, in order to solve the large input current ripple generated in discontinuous conduction mode, which affects the life of the power supply input terminal, the input of the driver is an input current ripple cancellation architecture. This architecture can reduce input current ripple, requires only a few additional components, and does not require any active circuit to control. The proposed single-inductor multiple-output boost-type LED driver with input current ripple cancelation is implemented in TSMC 0.35μm 2P4M CMOS process. The chip area including I/O PADs is 1.4966 x 1.4785 mm2(W x L). The specifications of the LED driver are input voltage of 5V, output voltage of 7-10V, switch frequency of 500 kHz, LED current range of 150mA-350mA.The simulation results show that when the LED current is operated at 150mA-350 mA, the current errors of red, green and blue light are less than 0.3%. In addition, the driver input current ripple is less than 0.5% through the current ripple cancellation circuit.
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Books on the topic "Rippon Lea"

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Historic, Gardens Conference (1986 Melbourne Australia). Papers presented at the Historic Gardens Conference 'Rippon Lea', Melbourne, 16 April 1986. Victoria: Ministry for Planning and Environment and Historic Buildings Council, 1986.

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The ripple effect: How better sex can lead to a better life. Emmaus, Pa: Rodale, 2009.

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Influence, Connected Women of. Ripple Effect: Women Lead Publication. Women Lead Publishing, 2020.

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Pattriclenc, Audrey. Getting Lean on Keto: The Best Meal Plan to Get Lean and Ripped. Independently Published, 2019.

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Cooke, Anthony. Intermittent Fasting Meal Plan Get Lean and Ripped Fast!: Follow This Easy Step-By-step Plan to Get Lean and Ripped Fast! Independently Published, 2018.

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John D. [from old catalog] MacDonald. Green Ripper : Introduction by Lee Child: Travis Mcgee, No. 18. Transworld Publishers Limited, 2013.

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Warren, Caren. Carnivore Diet: Meat Eating Diet Guide with Recipes for Getting Lean, Ripped and Lose Fat Quick. Independently Published, 2018.

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Imam, Raza. The Home Workout Handbook: Proven Workouts to Get Lean and Ripped in 30 Minutes a Day. Independently Published, 2018.

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Matthews, Grant. Carnivore Diet: A Complete Beginner's Guide to Get Lean, Ripped, and Lose Fat with 30 Easy Keto Recipes. Independently Published, 2018.

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Barbara, Lee. Carnivore Diet User's Manual & Cookbook: The Complete Guide on Weight Loss, Optimum Health, Lean Body, and Getting Ripped on Animal-Based Diet. Independently Published, 2019.

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Book chapters on the topic "Rippon Lea"

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"3. Endless Ripple." In The Final Leap, 55–79. University of California Press, 2019. http://dx.doi.org/10.1525/9780520951402-005.

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Konrád, Ota, and Rudolf Kučera. "Jack the Ripper and Sherlock Holmes." In Paths out of the Apocalypse, 88–94. Oxford University Press, 2022. http://dx.doi.org/10.1093/oso/9780192896780.003.0008.

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Rapid urban development and industrialization resulted in a sharp increase in the population of both Vienna and Prague at the end of the nineteenth century. This dynamic population growth in turn led to the need to diversify the press, leading to cheap newspapers that were aimed at the lower classes, who had moved to the cities from the countryside. These new types of newspapers placed an emphasis on sensationalist reporting, including in the case of murder, showing the dark side of urban modernity. The modern city, in opposition to the countryside, became the symbolic center of a dark and violent form of deviance, around which a cultural narrative also formed. The most emblematic example was the case of Jack the Ripper in east London. Soon all states in Europe were in search of their own Ripper, with the tabloid press in hot pursuit to boost sales and quench the thirst of its readership for sensationalist murder cases and to strengthen the stereotype of the dark urban metropolis. The glorification of crime and its perpetrators however led to a counter-narrative that put at its center the detective fighting these crimes. Similarly to the case of Jack the Ripper, another British (in this case fictional) protagonist, Arthur Conan Doyle’s detective Sherlock Holmes, became an inspiration for writers in the Habsburg Monarchy. The sensationalist press and the heroes of dime novels transformed the perception of physical violence into one of the defining features of urban modernity.
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Koutsopoulos, Kostis. "From Ground to Cloud." In Research Anthology on Architectures, Frameworks, and Integration Strategies for Distributed and Cloud Computing, 2601–21. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-5339-8.ch126.

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As technology has become an agent of immense change, it has forced upon the education system Cloud Computing, which in the form of School on the Cloud will have significant future ripple effects. In moving from ground (present conditions) to Cloud (future conditions), there is a need to examine the educational enhancements and the future ramifications of this technology. The description of these effects represents the goal of this chapter, by reviewing the major aspects of the future of Cloud Based Education and by presenting the approach and the results of a foresight exercise, which have led to the development of a series of future scenarios related to the future roles of the major education stakeholders.
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Koutsopoulos, Kostis. "From Ground to Cloud." In Handbook of Research on Educational Design and Cloud Computing in Modern Classroom Settings, 1–21. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-3053-4.ch001.

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As technology has become an agent of immense change, it has forced upon the education system Cloud Computing, which in the form of School on the Cloud will have significant future ripple effects. In moving from ground (present conditions) to Cloud (future conditions), there is a need to examine the educational enhancements and the future ramifications of this technology. The description of these effects represents the goal of this chapter, by reviewing the major aspects of the future of Cloud Based Education and by presenting the approach and the results of a foresight exercise, which have led to the development of a series of future scenarios related to the future roles of the major education stakeholders.
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Bareksten, Berit. "Barn, bok og boller: Fra frivillig lokalsamfunnsarbeid med boksamling og formidling til offentlig bibliotekfilial i bydelen." In Kollektiv mobilisering, 301–28. Cappelen Damm Akademisk/NOASP, 2022. http://dx.doi.org/10.23865/noasp.168.ch12.

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This chapter is about the collective mobilization and cooperation that emerged through the voluntary organization Initiativ:Laksevåg (I:L) and the establishment of the library and dissemination arena Barn, Bok & Boller (Children, Books and Buns) (BBB). How did I:L and BBB play alongside the area initiative for indre Laksevåg, the local cultural office and other cultural institutions, private actors, organizations and arenas in the local community, as well as partners in neighboring municipalities, in promoting the re-establishment of a public library through collective mobilization and community development? The chapter highlights how grassroots mobilization can create lasting systemic change and contribute to increased participation and activity in a community. Ripple effects have led to the establishment of several arenas, which in turn have reached new groups in the population.
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Crandall, Russell. "El Narco Mexicano." In Drugs and Thugs, 270–94. Yale University Press, 2020. http://dx.doi.org/10.12987/yale/9780300240344.003.0019.

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This chapter elaborates on how Mexico's decades of living dangerously were in part fueled by the U.S. war on drugs. It talks about the cultural shifts that normalized drugs, such as cocaine and heroin, in the United States in the 1960s and 1970s that had ripple effects from the opium fields of the Sierra Madre to the government agencies of Mexico City. It also explains how the colossal demand for drugs across the border prompted Mexican entrepreneurs to get into the drug business, as it had throughout Latin America. The chapter examines the struggles for control of the drug trade that led to the concentration of power in the hands of a small number of gangs and cartels on the Pacific and Gulf coasts, in border states such as Chihuahua, and in sparsely populated and lightly policed Sinaloa. It details how Mexican gangs smuggled homegrown marijuana and heroin to their northern neighbors for decades leading up to the 1980s.
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Camiade, Martine. "Évolution d’un territoire de moyenne montagne et de son habitat : Riprons à Laroque-des-Albères (xive-xviiie siècles)." In Habitats et peuplement dans les Pyrénées au Moyen Âge et à l’époque moderne, 241–61. Presses universitaires du Midi, 2009. http://dx.doi.org/10.4000/books.pumi.30231.

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Squires, Sally. "Nutrition." In A Field Guide for Science Writers. Oxford University Press, 2005. http://dx.doi.org/10.1093/oso/9780195174991.003.0032.

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Twenty years ago, if someone had suggested that nutrition news would regularly make the “A” section of major newspapers—and often the front page—I probably would have laughed. Sure, through the years, the occasional nutrition or weight-related story has made it to the front page. In 1998, a committee convened by the National Heart, Lung, and Blood Institute changed the definition of “overweight.” Twenty-nine million Americans went to sleep thinking they were fine and woke up to learn that the government now said they needed to shed 6 to 12 pounds to be at a healthy weight. That story, which I covered for the Washington Post, made it not to just to the front page but above the fold. The straight news story began this way: . . . The federal government plans to change its definition of what is a healthy weight, a controversial move that would classify millions more Americans as being overweight. . . . . . . Under the new guidelines, an estimated 29 million Americans now considered normal weight will be redefined as overweight and advised to do everything they can to prevent further weight gain. Those who are already experiencing health effects, such as high blood pressure, elevated cholesterol or diabetes, will be encouraged to lose small amounts of weight—about six to 12 pounds—to bring them back to safer weight levels. . . . But in a follow-up piece that I did for the Health section, I had a little more fun with the off-the-news lead and wrote this: . . . What do Olympic gold medal skier Picabo Street and Baltimore Orioles third baseman Cal Ripken Jr. have in common? . . . . . . According to new federal guidelines, they are both overweight. . . . . . . So what should they and the millions of other adults suddenly classified as overweight do about their extra pounds? Athletes like Street and Ripken may be special cases, but what about the rest of us? . . . In this follow-up story, I was able to offer a more in-depth explanation of the body mass index—a screening measure for determining a healthy weight that has replaced the old Metropolitan Life Insurance height and weight charts, which used body frame size, height, and gender to offer healthy body weight.
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Birkland, Thomas A., and Megan K. Warnement. "Critical Infrastructure in Extreme Events." In Controversies in Science and Technology. Oxford University Press, 2014. http://dx.doi.org/10.1093/oso/9780199383771.003.0006.

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The September 11 attacks triggered concern about the performance of “critical” infrastructure on which social, political, and economic activity depend. The attacks moved terrorism to the top of the national security agenda and led to significant legislative, regulatory, and behavioral changes. Furthermore, the shift in focus to the threat of terrorism diminished policymakers’ appreciation and preparation for the natural disasters that communities typically face every year (Boin and McConnell 2007). The increasing number of declared natural disasters, coupled with the threat of terrorism, suggests that “extreme events” can lead to failures in critical infrastructure. These failures have national implications that can ripple through society and the economy. This chapter is about the performance of our interdependent infrastruc­ture systems in extreme events, which are outside shocks to infrastructures; we do not consider failures internal to a system, such as major power blackouts that are not triggered by some significant external shock. We argue that “infrastructure” is best considered as systems of technical and social systems that interact in both predictable and unpredictable ways. As such, we cannot simply consider their design and performance as solely technological problems. There is no one universally accepted definition of “infrastructure.” The Compact Oxford English Dictionary defines the term as “the basic physical and organizational structures and facilities (e.g., buildings, roads, power supplies) needed for the operation of a society or enterprise” but uses the example sentence “the social and economic infrastructure of a country,” suggesting that the term is very broad and very vague. The term came into widespread use in the 1960s and 1970s to mean “public works” (Boin and McConnell 2007). Alternative definitions link “public works” with narrowly defined systems, such as telecommunications and electrical systems, as well as broader systems such as finance, health care, and food production and distribution. The broader definition of infrastructure, which gained currency after September 11, refers to what’s become known as “critical” infrastructure.
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Bentley, Nick. "‘I’m an adolescent. And that’s how I’m going to stay’: Lessing and Youth Culture 1956–1962." In Doris Lessing and the Forming of History. Edinburgh University Press, 2016. http://dx.doi.org/10.3366/edinburgh/9781474414432.003.0003.

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The mid-to-late 1950s saw an explosion of youth subcultures in Britain – teenagers, Teddy Boys, jazz fans, hipsters, beatniks, mods and rockers. This range generated a series of moral panics and media fascination. The New Left in particularly were split on whether to see these new youth groups as indicative of a consumer-led Americanization of traditional working-class British culture or as potential sites for cultural (and political) rebellion. Lessing’s representation of youth is particularly interesting in this context, and it is a recurring theme in a number of works from this period including her plays Each to His Own Wilderness and Play With a Tiger, her documentary novel In Pursuit of the English, and her novels A Ripple From the Storm and The Golden Notebook. This chapter traces Lessing’s engagement with youth culture and argues that she articulates concerns within the New Left and British culture more broadly. Her work is read against contemporary cultural commentary from the New Left, especially in a series of articles in the Universities and Left Review, and against other fiction and commentary from the period, including works by Lynne Reid Banks, Anthony Burgess, Shelagh Delaney, Richard Hoggart, Colin MacInnes, Alan Sillitoe, and Muriel Spark.
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Conference papers on the topic "Rippon Lea"

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Sedykh, Sergey, Dmitriy Gadashev, and Alexandr Drakin. "METHODS OF REDUCING PULSATIONS OF LIGHT FLOW IN LED LIGHT SOURCES." In CAD/EDA/SIMULATION IN MODERN ELECTRONICS 2019. Bryansk State Technical University, 2019. http://dx.doi.org/10.30987/conferencearticle_5e028213f33ad1.39341792.

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The analysis of some circuitry options that contribute to reducing the ripple of the light flux is carried out, as well as the modeling of the simplest and most intuitive LED lamp circuits for a more qualitative assessment of the result in the form of the given dependence of the ripple coefficient on the total capacitance of the capacitors included in the filter circuit.
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de Melo, Maicol F., Jean S. Brand, Renan R. Duarte, Marco A. Dalla Costa, J. Marcos Alonso, and Yijie Wang. "Analysis of Low Frequency Ripple Transmission in LED Drivers." In 2018 IEEE Industry Applications Society Annual Meeting (IAS2018). IEEE, 2018. http://dx.doi.org/10.1109/ias.2018.8544501.

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Sekhar, V. Chandra, N. Vishwanathan, and S. P. Selvi. "Input Regulated Soft Switched Ripple Free Current LED Driver." In 2019 National Power Electronics Conference (NPEC). IEEE, 2019. http://dx.doi.org/10.1109/npec47332.2019.9034836.

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Loose, F., R. R. Duarte, C. H. Barriquello, M. A. Dalla Costa, L. Teixeira, and A. Campos. "Ripple-based visible light communication technique for switched LED drivers." In 2017 IEEE Industry Applications Society Annual Meeting. IEEE, 2017. http://dx.doi.org/10.1109/ias.2017.8101812.

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Ke, Shun-yuan, and Wei-ming Lin. "A novel lower output ripple single-stage flyback LED driver." In 2015 12th China International Forum on Solid State Lighting (SSLCHINA). IEEE, 2015. http://dx.doi.org/10.1109/sslchina.2015.7360698.

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Sekhar, V. Chandra, and N. Vishwanathan. "Reduced Ripple Current LED Driver with Reduced Output Filter Capacitance." In 2021 National Power Electronics Conference (NPEC). IEEE, 2021. http://dx.doi.org/10.1109/npec52100.2021.9672543.

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Devabhaktuni, Swati, Neti Vishwanathan, and Shunmugam Porpandiselvi. "Source Current Ripple Reduction with Input Voltage Controlled LED Driver." In 2021 National Power Electronics Conference (NPEC). IEEE, 2021. http://dx.doi.org/10.1109/npec52100.2021.9672535.

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Garcia, J., D. Camponogara, M. Dalla-Costa, D. Gacio, J. M. Alonso, and A. Campos. "LED driver with bidirectional series converter for low frequency ripple cancelation." In IECON 2012 - 38th Annual Conference of IEEE Industrial Electronics. IEEE, 2012. http://dx.doi.org/10.1109/iecon.2012.6389480.

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"Online high voltage power supply ripple estimation and feedforward in LEDA." In Proceedings of the 1999 American Control Conference. IEEE, 1999. http://dx.doi.org/10.1109/acc.1999.782434.

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Veeramallu, V. K. Satyakar, S. Porpandiselvi, and B. L. Narasimharaju. "Reduced ripple current LED lighting system with two series resonant converters." In 2017 2nd International Conference on Communication and Electronics Systems (ICCES). IEEE, 2017. http://dx.doi.org/10.1109/cesys.2017.8321239.

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Reports on the topic "Rippon Lea"

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Friedman, Haya, Julia Vrebalov, James Giovannoni, and Edna Pesis. Unravelling the Mode of Action of Ripening-Specific MADS-box Genes for Development of Tools to Improve Banana Fruit Shelf-life and Quality. United States Department of Agriculture, January 2010. http://dx.doi.org/10.32747/2010.7592116.bard.

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Fruit deterioration is a consequence of a genetically-determined fruit ripening and senescence programs, in which developmental factors lead to a climacteric rise of ethylene production in ethylene-sensitive fruits such as tomato and banana. Breeding of tomato with extended fruit shelf life involves the incorporation of a mutation in RIN, a MADS-box transcription factor participating in developmental control signalling of ripening. The RIN mode of action is not fully understood, and it may be predicted to interact with other MADS-box genes to execute its effects. The overall goal of this study was to demonstrate conservation of ripening control functions between banana and tomato and thus, the potential to genetically extend shelf-life in banana based on tools developed in tomato. The specific objectives were: 1. To increase the collection of potential RIN-like genes from banana; 2. To verify their action as developmental regulators; 3. To elucidate MADS-box gene mode of action in ripening control; 4. To create transgenic banana plants that express low levels of endogenous Le-RIN- like, MaMADS- gene(s). We have conducted experiments in banana as well as in tomato. In tomato we have carried out the transformation of the tomato rin mutant with the MaMADS1 and MaMADS2 banana genes. We have also developed a number of domain swap constructs to functionally examine the ripening-specific aspects of the RIN gene. Our results show the RIN-C terminal region is essential for the gene to function in the ripening signalling pathway. We have further explored the tomato genome databases and recovered an additional MADS-box gene necessary for fruit ripening. This gene has been previously termed TAGL1 but has not been functionally characterized in transgenic plants. TAGL1 is induced during ripening and we have shown via RNAi repression that it is necessary for both fleshy fruit expansion and subsequent ripening. In banana we have cloned the full length of six MaMADS box genes from banana and determined their spatial and temporal expression patterns. We have created antibodies to MaMADS2 and initiated ChI assay. We have created four types of transgenic banana plants designed to reduce the levels of two of the MaMADS box genes. Our results show that the MaMADS-box genes expression in banana is dynamically changing after harvest and most of them are induced at the onset of the climacteric peak. Most likely, different MaMADS box genes are active in the pulp and peel and they are differently affected by ethylene. Only the MaMADS2 box gene expression is not affected by ethylene indicating that this gene might act upstream to the ethylene response pathway. The complementation analysis in tomato revealed that neither MaMADS1 nor MaMADS2 complement the rin mutation suggesting that they have functionally diverged sufficiently to not be able to interact in the context of the tomato ripening regulatory machinery. The developmental signalling pathways controlling ripening in banana and tomato are not identical and/or have diverged through evolution. Nevertheless, at least the genes MaMADS1 and MaMADS2 constitute part of the developmental control of ripening in banana, since transgenic banana plants with reduced levels of these genes are delayed in ripening. The detailed effect on peel and pulp, of these transgenic plants is underway. So far, these transgenic bananas can respond to exogenous ethylene, and they seem to ripen normally. The response to ethylene suggest that in banana the developmental pathway of ripening is different than that in tomato, because rin tomatoes do not ripen in response to exogenous ethylene, although they harbor the ethylene response capability This study has a major contribution both in scientific and agricultural aspects. Scientifically, it establishes the role of MaMADS box genes in a different crop-the banana. The developmental ripening pathway in banana is similar, but yet different from that of the model plant tomato and one of the major differences is related to ethylene effect on this pathway in banana. In addition, we have shown that different components of the MaMADS-box genes are employed in peel and pulp. The transgenic banana plants created can help to further study the ripening control in banana. An important and practical outcome of this project is that we have created several banana transgenic plants with fruit of extended shelf life. These bananas clearly demonstrate the potential of MaMADS gene control for extending shelf-life, enhancing fruit quality, increasing yield in export systems and for improving food security in areas where Musaspecies are staple food crops.
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