Journal articles: 'Dc extraction'

1

Volkov, I. V., and S. V. Podolny. "DC/DC CONVERTER WITH METERED ENERGY EXTRACTION AND TRANSMISSION." Tekhnichna Elektrodynamika 2020, no. 1 (January 16, 2020): 10–16. http://dx.doi.org/10.15407/techned2020.01.010.

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Youssef, Tarek, Moataz Elsied, A. Salem, Amrane Oukaour, Hamid Gualous, and Osama Mohammed. "Carrier extraction based synchronization scheme for distributed DC–DC converters in DC-Microgrid." Electric Power Systems Research 161 (August 2018): 114–22. http://dx.doi.org/10.1016/j.epsr.2018.04.004.

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Zhang, Fan, Xiaohua Qi, Mingqiang Zou, and Jinfeng Li. "Analysis of Rutin fromLespedeza virgata(Thunb.) DC. by Microwave-Assisted Extraction and Capillary Electrophoresis." Journal of Chemistry 2013 (2013): 1–5. http://dx.doi.org/10.1155/2013/324294.

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A simple and rapid microwave-assisted extraction (MAE) technique was developed for the extraction of rutin fromLespedeza virgata(Thunb.) DC. The influence of four extraction variables on extraction of rutin was discussed. The optimum extraction conditions found were 75% aqueous ethanol, solvent volume to sample weight ratio at 90 : 1, extracting temperature at75°C, and extraction time for 15 min. A comparison was made among MAE, classical maceration, and ultrasonic-assisted extraction (UAE). Yields were determined by high-performance capillary electrophoresis (HPCE). The whole analysis process was completed in ten minutes. The needful volumes of sample and buffer are very little. Compared with maceration and ultrasonic extraction, MAE is a rapid method with higher yield and less solvent consumption.

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Dyachok, Vasil. "Extraction Process of Intracellular Substance." Chemistry and Chemical Technology 4, no. 2 (June 15, 2010): 163–66. http://dx.doi.org/10.23939/chcht04.02.163.

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In this study the mathematical model of the extraction process from plant material is developed, taking into account the anatomical structure of plant material, namely the presence of cellular and intercellular spaces. The solution of the model enables to determine its kinetic coefficients Dc, Dt, process conditions, and predict the kinetics of the extraction process implementation in practice.

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Chi, Yuanlong, Yanglong Deng, Shenghui Pu, Yao Ren, Zhifeng Zhao, and Qiang He. "Ultrasound-assisted enzymatic extraction of hydroxy-sanshool compounds from the hydrodistillation residue of two Sichuan peppers: optimization, quantification and pungent taste contribution evaluation." RSC Advances 11, no. 8 (2021): 4547–54. http://dx.doi.org/10.1039/d0ra09234g.

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Hydroxy-sanshool compounds were extracted from the hydrodistillation residue of Z. bungeanum Maxim. pericarp and Z. armatum DC. pericarp by using ethanol–water extraction and extractions assisted with (i) enzymes, (ii) ultrasound, and (iii) enzymes and ultrasound.

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Wang, Li Sheng, Wei Wang, Yan Ge, and Jiangtao Tang. "Optimization of the Water Extraction Technology of Flavonoids in Emilia Sonchifolia (Linn.) DC." Advanced Materials Research 634-638 (January 2013): 1016–21. http://dx.doi.org/10.4028/www.scientific.net/amr.634-638.1016.

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Single factor experiments and orthogonal experiments were successively carried out to optimize the water extraction technology of flavonoids in Emilia sonchifolia (Linn.) DC. The results showed that the influential order of factors was extraction times >solid-liquid ratio >extraction time. The optimum conditions were 15:1 of solid-liquid ratio, 2h of the extraction time and 3 of the extraction times. Under these conditions, the extraction yield of flavonoids from Emilia sonchifolia (Linn.) DC was 3.35%.

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Sargenti, S. R., and F. M. Lanças. "Supercritical fluid extraction ofCymbopogon citratus (DC.) Stapf." Chromatographia 46, no. 5-6 (September 1997): 285–90. http://dx.doi.org/10.1007/bf02496320.

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Jomaah, Jalal, Majida Fadlallah, and Gerard Ghibaudo. "DC Characterization of Different Advanced MOSFET Architectures." Advanced Materials Research 324 (August 2011): 407–10. http://dx.doi.org/10.4028/www.scientific.net/amr.324.407.

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A review of recent results concerning the DC characterization of FD- and Double Gate SOI MOSFET’s and FinFETs in modern CMOS technologies is given. By proper extraction techniques, distinction between the different interaction mechanisms is done. Parameter extraction conducted at room and low temperature clearly indicates that the mobility is directly impacted by shrinking the gate length in sub 100nm architectures.

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Fourie, Coenrad J. "Extraction of DC-Biased SFQ Circuit Verilog Models." IEEE Transactions on Applied Superconductivity 28, no. 6 (September 2018): 1–11. http://dx.doi.org/10.1109/tasc.2018.2829776.

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Çay, Zarife, Olaf Henze, and Thomas Weiland. "Extraction of DC busbar parasitics in PWM inverters." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 28, no. 4 (July 10, 2009): 1033–43. http://dx.doi.org/10.1108/03321640910959080.

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Ibarra, A., and J. Gracia. "Strategy for DC parameter extraction in bipolar transistors." IEE Proceedings G Circuits, Devices and Systems 137, no. 1 (1990): 5. http://dx.doi.org/10.1049/ip-g-2.1990.0002.

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OGAWA, M., M. YOSHIDA, M. NAKAJIMA, J. HASEGAWA, S. FUKATA, K. HORIOKA, and Y. OGURI. "High-current laser ion source based on a low-power laser." Laser and Particle Beams 21, no. 4 (October 2003): 633–38. http://dx.doi.org/10.1017/s0263034603214233.

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An ion source for generation of low-charged heavy ions has been developed using low-power KrF excimer and frequency-doubled Nd:YAG lasers. The ion source was examined with two experimental modes of low-voltage DC extraction at ∼20 kV and high-voltage pulse extraction at 150 kV. Normalized emittance of extracted beams composed of Cu+ and Cu2+ ions was measured to be about 0.05 and 0.8 πmm-mrad for the DC extraction and the pulse extraction, respectively. Electron temperature was observed by means of a single probe method to be 0.8 to 2.5 eV, depending on the intensity of the KrF laser.

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Musznicki, Piotr, Pawel B. Derkacz, and Piotr J. Chrzan. "Wideband Modeling of DC-DC Buck Converter with GaN Transistors." Energies 14, no. 15 (July 22, 2021): 4430. http://dx.doi.org/10.3390/en14154430.

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The general wideband modeling method of the power converter is presented on the example of DC-DC buck converter with GaN High Electron Mobility Transistors (HEMT). The models of all basic and parasitic components are briefly described. The two methods of Printed Circuit Board (PCB) layout parameter extraction are presented. The results of simulation in Saber@Sketch simulation software and measurements are compared. Next, the model of the converter is reduced to obtain one lumped inductance of the input filter PCB for the analytical prediction of transistor turn-off ringing frequency and overvoltage. The practical use of the model is presented for sizing optimal capacitance of snubber.

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El Khateb, Ahmad H., Nasrudin Abd Rahim, Jeyraj Selvaraj, and Barry W. Williams. "DC-to-DC Converter With Low Input Current Ripple for Maximum Photovoltaic Power Extraction." IEEE Transactions on Industrial Electronics 62, no. 4 (April 2015): 2246–56. http://dx.doi.org/10.1109/tie.2014.2383999.

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Fujii, Tomomi, Aya Asano, Keiji Shimada, Yoshihiro Tatsumi, Chiho Obayashi, and Noboru Konishi. "Evaluation of RNA and DNA extraction from liquid-based cytology specimens." Diagnostic Cytopathology 44, no. 10 (June 30, 2016): 833–40. http://dx.doi.org/10.1002/dc.23524.

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Xu, Zhao, Yitong Zhang, Zhen Pan, Chengzhi Chi, and Xiaobin Liu. "Research on typical fault classification method of DC-DC converter." Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University 39, no. 1 (February 2021): 71–76. http://dx.doi.org/10.1051/jnwpu/20213910071.

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DC-DC converter is the core component of power conversion module of integrated modular avionics. Condition monitoring and fault diagnosis of DC-DC converter can effectively improve the reliability of avionics equipment, reduce the maintenance cost and greatly improve the use efficiency of aircraft. In this paper, firstly, a typical DC-DC converter model based on SEPIC topology is designed in PSPICE environment, and the failure modes of DC-DC converter are analyzed. Secondly, the typical fault types of DC-DC converter are simulated, and the corresponding original data are obtained through simulation. Finally, the processing framework including data preprocessing, feature extraction and selection, and multi model fusion is used to do fault classification of the DC-DC converter. The fault diagnosis of the converter is simulated. Simulation results show the effectiveness of the proposed method.

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Alam, Muhammad Samiul, Kazi Muhammad Asif Ashrafi, Marjana Tahmid, Baque Billah, and Tania Khadem. "Design of MPPT Based PV System Using DC-DC Converter." EDU Journal of Computer and Electrical Engineering 2, no. 1 (December 31, 2021): 24–29. http://dx.doi.org/10.46603/ejcee.v2i1.27.

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This paper aims to analyze the potentiality and cost-effectiveness of PV systems' application and ensure maximum power extraction from the solar panel. Solar panels have stationary parts with a durable lifetime along with the nature of modularity and shorter commissioning time compared to other available energy sources. To clinch the tracking of maximum power Mpp, Perturb, and Observe algorithm is preferred. Matching the load impedance with the PV panel is ensured by employing a Boost converter topology where the duty cycle is adjustable. The system was comprised of a solar module, DC-DC Boost converter, and a resistive load. The system was designed, and performances were evaluated through simulation using PSIM software. Later the parameters were verified by experimental conditions using a solar panel of the exact specifications, and some data were obtained close to the simulated data.

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Tang, Yu Qin, and Yi Tao Zhao. "Ultrasound-Assisted Extraction of Polysaccharides from Pleurotus eryngii (DC. ex Fr.) Quel." Advanced Materials Research 610-613 (December 2012): 3410–15. http://dx.doi.org/10.4028/www.scientific.net/amr.610-613.3410.

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The purpose of this study was to select the optimum ultrasound-assisted extraction (UAE) conditions for the extraction of polysaccharides from Pleurotus eryngii (DC. ex Fr.) Que (P. eryngii ). The main factors that affect the extraction yield of polysaccharides such as solid:liquid ratio, ultrasonic power, extraction time and extraction temperature were studied individually. An orthogonal experiment was designed to optimize the extraction parameters. It was found that UAE method was a reliable, simple and effective method for fast extraction of polysaccharides from P. eryngii. The optimum UAE conditions were as followings: Solid:liquid ratio of 1:35, Ultrasonic power of 55 W, Extraction time of 30 min and extraction temperature of 45°C.

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Nafiunisa, Aininu, Nita Aryanti, and Dyah Hesti Wardhani. "Kinetic Study of Saponin Extraction from Sapindus rarak DC by Ultrasound-Assisted Extraction Methods." Bulletin of Chemical Reaction Engineering & Catalysis 14, no. 2 (August 1, 2019): 468. http://dx.doi.org/10.9767/bcrec.14.2.4253.468-477.

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Saponin is an important plant-derived compound that is commonly found in sapindaceae plants, such as Sapindus rarak DC. Saponin is extensively used in plenty of industries as a detergent or emulsifying agent in cleansers, shampoos, and cosmetics. The extraction of saponin was previously studied and shows that the extraction assisted by ultrasonic waves was found to be an effective method. However, the previous studies have rarely examined the extraction kinetic study of the ultrasound-assisted extraction (UAE). In the present study, the extraction of saponin from Sapindus rarak DC and its extraction kinetics is conducted. The results show that the highest saponin yield of 354.92 (mg of saponin per gram of dry feed) was obtained from the extraction using a solid-to-liquid (S/L) ratio of 1:50 (w/v) at 50 °C. The amount of extracted saponin increased with the increase of extraction temperature as well as the solute ratio in the solution. However, increasing the temperature to 60 °C decreased the saponin yield. The results of a simple kinetics study of saponin extraction also show that the second-order kinetics model can better describe the UAE process, with an R2 value of 0.929 and a rate coefficient of 0.00495 L.g-1.min-1. The experimental results agree well with the practical calculations obtained using the second-order kinetics model based on an average error of 6.79%. Copyright © 2019 BCREC Group. All rights reserved

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Moutchou, Mohamed, and Atman Jbari. "Fast photovoltaic IncCond-MPPT and backstepping control, using DC-DC boost converter." International Journal of Electrical and Computer Engineering (IJECE) 10, no. 1 (February 1, 2020): 1101. http://dx.doi.org/10.11591/ijece.v10i1.pp1101-1112.

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In this paper, we present our contribution in photovoltaic energy optimization subject. In this research work, the goal is to determinate fastly the optimal PV Module working point, allowing maximum power extraction. In this work we use DC-DC Boost converter to control the working point, by adjusting PV voltage trough duty cycle. In order to achieve our goal, we use the combination of incremental conductance MPPT technique and DC-DC Boost converter backstepping control. The validation of this control is made by Matlab simulation; the obtained results prove its effectiveness and its good maximum power tracking dynamics for different irradiance and temperature profiles.

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Osmani, Khaled, Ahmad Haddad, Thierry Lemenand, Bruno Castanier, and Mohamad Ramadan. "An investigation on maximum power extraction algorithms from PV systems with corresponding DC-DC converters." Energy 224 (June 2021): 120092. http://dx.doi.org/10.1016/j.energy.2021.120092.

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Miyamoto, Ryoichi, Amane Takahashi, Aya Ogasawara, Toshiro Ogura, Kei Kitamura, Hiroyuki Ishida, Shinichi Matsudaira, Satoshi Nozu, and Yoshiyuki Kawashima. "Three-dimensional simulation of the pancreatic parenchyma, pancreatic duct and vascular arrangement in pancreatic surgery using a deep learning algorithm." PLOS ONE 17, no. 10 (October 28, 2022): e0276600. http://dx.doi.org/10.1371/journal.pone.0276600.

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Three-dimensional surgical simulation, already in use for hepatic surgery, can be used in pancreatic surgery. However, some problems still need to be overcome to achieve more precise pancreatic surgical simulation. The present study evaluates the performance of SYNAPSE VINCENT® (version 6.6, Fujifilm Medical Co., Ltd., Tokyo, Japan) in the semiautomated surgical simulation of the pancreatic parenchyma, pancreatic ducts, and peripancreatic vessels using an artificial intelligence (AI) engine designed with deep learning algorithms. One-hundred pancreatic cancer patients and a control group of 100 nonpancreatic cancer patients were enrolled. The evaluation methods for visualizing the extraction were compared using the Dice coefficient (DC). In the pancreatic cancer patients, tumor size, position, and stagewise correlations with the pancreatic parenchymal DC were analyzed. The relationship between the pancreatic duct diameter and the DC, and between the manually and AI-measured diameters of the pancreatic duct were analyzed. In the pancreatic cancer/control groups, the pancreatic parenchymal DC and pancreatic duct extraction were 0.83/0.86 and 0.84/0.77. The DC of the arteries (portal veins/veins) and associated sensitivity and specificity were 0.89/0.88 (0.89/0.88), 0.85/0.83 (0.85/0.82), and 0.82/0.81 (0.84/0.81), respectively. No correlations were observed between pancreatic parenchymal DC and tumor size, position, or stage. No correlation was observed between the pancreatic duct diameter and the DC. A positive correlation (r = 0.61, p<0.001) was observed between the manually and AI-measured diameters of the pancreatic duct. Extraction of the pancreatic parenchyma, pancreatic duct, and surrounding vessels with the SYNAPSE VINCENT® AI engine assumed to be useful as surgical simulation.

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Kang, Jin-Wook, Ki-Woong Shin, Hoon Lee, Kyung-Min Kang, Jintae Kim, and Chung-Yuen Won. "A Study on Stability Control of Grid Connected DC Distribution System Based on Second Order Generalized Integrator-Frequency Locked Loop (SOGI-FLL)." Applied Sciences 8, no. 8 (August 16, 2018): 1387. http://dx.doi.org/10.3390/app8081387.

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This paper studies a second order generalized integrator-frequency locked loop (SOGI-FLL) control scheme applicable for 3-phase alternating current/direct current (AC/DC) pulse width modulation (PWM) converters used in DC distribution systems. The 3-phase AC/DC PWM converter is the most important power conversion system of DC distribution, since it can boost 380 Vrms 3-phase line-to-line AC voltage to 700 Vdc DC output with various DC load devices and grid voltages. The direct-quadrature (d-q) transformation, positive sequence voltage extraction, proportional integral (PI) voltage/current control, and phase locked loop (PLL) are necessary to control the 3-phase AC/DC PWM converter. Besides, a digital filter, such as low pass filter and all pass filter, are essential in the conventional synchronous reference frame-phase locked loop (SRF-PLL) method to eliminate the low order harmonics of input. However, they limit the bandwidth of the controller, which directly affects the output voltage and load of 3-phase AC/DC PWM converter when sever voltage fluctuation, such as sag, swell, etc. occurred in the grid. On the other hand, the proposed control method using SOGI-FLL is able to do phase angle detection, positive sequence voltage extraction, and harmonic filtering without additional digital filters, so that more stable and fast transient control is achieved in the DC distribution system. To verify the improvement of the characteristics in the unbalanced voltage and frequency fluctuation of the grid, a simulation and experiment are implemented with 50 kW 3-phase AC/DC PWM converter used in DC distribution.

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CHI, Chengzhi, Zhen PAN, Zhao XU, and Yitong ZHANG. "Power converter fault classification method based on multi-feature selection algorithm." Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University 40, no. 3 (June 2022): 645–50. http://dx.doi.org/10.1051/jnwpu/20224030645.

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In the process of fault diagnosis for the core components of the integrated modular avionics power conversion module, selecting appropriate features can effectively improve the efficiency and classification accuracy of the model, and greatly reduce the computational complexity of the learning algorithm. This paper first designs a typical Sepic structure DC-DC converter model to simulate the typical fault types of the DC-DC converter; secondly, the corresponding original data is obtained through simulation; after data preprocessing, feature extraction and using multiple feature selection fusion algorithm, BP neural network method is used finally for fault diagnosis analysis of DC-DC converter. The simulation verifies the effectiveness of the above method.

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Liu, Gang, Xi Chen, Shiqiang Zheng, and Peiling Cui. "Commutation error rapid compensation for brushless DC motor based on DC‐link current phase extraction method." IET Electric Power Applications 14, no. 3 (February 11, 2020): 433–40. http://dx.doi.org/10.1049/iet-epa.2019.0660.

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Glowacz, Adam. "Fault diagnostics of DC motor using acoustic signals and MSAF-RATIO30-EXPANDED." Archives of Electrical Engineering 65, no. 4 (December 1, 2016): 733–44. http://dx.doi.org/10.1515/aee-2016-0051.

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AbstractAn early fault diagnostic method of Direct Current motors was presented in this article. The proposed method used acoustic signals of a motor. A method of feature extraction called MSAF-RATIO30-EXPANDED (method of selection of amplitudes of frequencies - ratio 30% of maximum of amplitude - expanded) was presented and implemented. An analysis of proposed method was carried out for early fault states of a real DC motor. Four following states of the DC motor were measured and analyzed: the healthy DC motor, DC motor with 3 shorted rotor coils, DC motor with 6 shorted rotor coils, DC motor with a broken coil. Measured states were caused by natural degradation of the DC motor. The obtained results of analysis were good. The presented early fault diagnostic method can be used for protection of DC motors.

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Chen, Chuying, Qiang Huang, Jinyin Chen, Kannan RR Rengasamy, and Chunpeng Wan. "Extraction optimization of antifungal compounds from Thalictrum foliolosum DC. roots." South African Journal of Botany 138 (May 2021): 328–36. http://dx.doi.org/10.1016/j.sajb.2021.01.016.

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Liu, Jian, Qing Xu, Zhengqi Tian, Yuxuan Guo, Shunran Qi, and Lihui Wang. "Feature Extraction Method for DC Charging Signal of Electric Vehicle." Journal of Physics: Conference Series 1069 (August 2018): 012114. http://dx.doi.org/10.1088/1742-6596/1069/1/012114.

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Sabat, Samrat L., Leandro dos Santos Coelho, and Ajith Abraham. "MESFET DC model parameter extraction using Quantum Particle Swarm Optimization." Microelectronics Reliability 49, no. 6 (June 2009): 660–66. http://dx.doi.org/10.1016/j.microrel.2009.03.005.

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Yuan, Bo, Fang Yu, WenJi Song, ZhengNan Zhao, and HaiDong Liang. "Optimization of extraction of total flavonoids from Drynaria rhizome, and its effect on osteoclast differentiation." Tropical Journal of Pharmaceutical Research 18, no. 4 (May 24, 2021): 829–35. http://dx.doi.org/10.4314/tjpr.v18i4.21.

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Purpose: To optimize the extraction parameters for total flavonoids of Drynaria rhizome, and determine their effect on osteoclast differentiation and bone resorption in vitro. Methods: A 5-level 3-factor central composite design was applied to the optimization of extract yield of total flavonoids from Drynaria rhizome. Response Surface Methodology (RSM) design was used to optimize total flavonoids extraction from Drynaria rhizome. The independent factors included extraction temperature (A), extraction time (B) and liquid: solid ratio (C). Moreover, NFATc1, DC-STAMP, cathepsin K and MMP-9 mRNA expressions were determined. Results: Values obtained were fitted into a second-order polynomial equation with multiple regression analysis using a statistical method. Analysis of variance results indicate that the independent variables influenced total flavonoid extraction from Drynaria rhizome. The optimal conditions for extraction yield were extraction temperature of 75 oC, extraction time of 100 min, and liquid: solid ratio of 107:1. The yield of 5.38 ± 0.62 % was consistent with these optimized conditions, which was an indication of the accuracy of the model. Experiments revealed that total flavonoids from Drynaria rhizome regulated the expression levels of NFATc1, DC-STAMP, cathepsin K and MMP-9 mRNA Conclusion: This study has successfully optimized the extraction yield of total flavonoids from Drynaria rhizome. The total flavonoids inhibit osteoclast differentiation and bone resorption. Thus, they may be beneficial in the treatment of bone diseases.

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Darameičikas, Mantas, Firdaus Muhammad Sukki, Siti Hawa Abu Bakar, Nazmi Sellami, Nurul Aini Bani, Mohd Nabil Muhtazaruddin, Abdullahi Abubakar Mas’ud, and Jorge Alfredo Ardila Rey. "Improved design of a DC-DC converter in residential solar photovoltaic system." International Journal of Power Electronics and Drive Systems (IJPEDS) 10, no. 3 (September 1, 2019): 1476. http://dx.doi.org/10.11591/ijpeds.v10.i3.pp1476-1482.

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<span>With growing demand in renewable energy, solar photovoltaic (PV) technology is becoming more popular. A number of research has been carried out to increase the efficiency of the PV system. One of them is improving the Switch Mode Power Supplies (SMPS) performance to ensure maximum solar energy extraction. This paper looks at buck type SMPS suitability for use in solar PV installed in residential houses. The main issues that affect the response from the output are identified. The work will utilise the LT SPICE software to carry out the simulation. The primary objective of the study is to design an improved converter controller which is more robust and is able to maintain constant output. The emphasis is on good efficiency, stability and low output voltage ripple. This could be achieved by using the current mode control (CMC) techniques – an alternative design to the voltage mode control technique (VMC). Results obtained via simulations reveal strong evidence of CMC superiority over the VMC.</span>

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Pious, Ani, and K. Rajalakshmi. "Optimization of Subcell Interconnection for Multijunction Solar Cells Using DC-DC Converter." Applied Mechanics and Materials 573 (June 2014): 52–58. http://dx.doi.org/10.4028/www.scientific.net/amm.573.52.

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The extraction of solar energy will be higher using the multijunction solar cells instead of single junction solar cell by splitting the solar spectrum. This work proposes a detailed study to identify the optimum interconnection method for various multijunction solar cells. An effective power electronic circuit could substantially enhance the efficiency and utilization of a photovoltaic (PV) power system constructed from multijunction solar cells. The multiple input dc-dc non-inverting buck-boost converter is used to demonstrate the advantage of the proposed interconnection technique, which can maintain a constant output voltage by performing both the buck and boost mode of operation. In order to ensure maximum power point (MPP) operation, a particle swarm optimization (PSO) algorithm is applied which needs only one MPP control for multiple solar modules resulting reduction in cost and complexity. The PSO algorithm has the ability to track the global maxima of the system even under complex illumination situations.

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Sayali Mali, P. Keerthi Kundana, Sunita Singh, Sinika Khanchandani, Milind S. Tullu, Mukesh Agrawal, and Adesh Kakade. "Platelet and blood transfusion in a child with dyskeratosis congenita for dental extraction – a case report." RSBO 15, no. 2 (December 20, 2018): 116–22. http://dx.doi.org/10.21726/rsbo.v15i2.622.

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Dyskeratosis congenita (DC) also known as Zinsser-Engman- Cole Syndrome is a rare inherited disorder with a prevalence of less than one per million. Zinsser et al. described an inherited variant of ectodermal dysplasia that affected skin, nails and mucous membranes in early 1900s.The syndrome eventually came to be known as DC and is classified as one of the inherited bone marrow failure syndromes (IBMFS). DC is the association of three clinical features: dystrophic nails, oral leukoplakia (white spots on the tongue and oral mucosa) and abnormal skin pigmentation. Case report and Conclusion: This case report describes a dental management of a case of DC. Fluctuating vital and blood parameters and deteriorating overall health status were major challenges delivering dental treatment. Dental extractions of this patient were done while maintaining blood parameters by blood and platelet transfusion.

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Mali, Sayali, P. Keerthi Kundana, Sunita Singh, Sinika Khanchandani, Milind S. Tullu, Mukesh Agrawal, and Adesh Kakade. "Platelet and blood transfusion in a child with dyskeratosis congenita for dental extraction – a case report." RSBO 15, no. 2 (January 25, 2019): 116. http://dx.doi.org/10.21726/rsbo.v15i2.678.

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Introduction and Objective: Dyskeratosis congenita (DC) also known as Zinsser-Engman- Cole Syndrome is a rare inherited disorder with a prevalence of less than one per million. Zinsser et al. described an inherited variant of ectodermal dysplasia that affected skin, nails and mucous membranes in early 1900s.The syndrome eventually came to be known as DC and is classified as one of the inherited bone marrow failure syndromes (IBMFS). DC is the association of three clinical features: dystrophic nails, oral leukoplakia (white spots on the tongue and oral mucosa) and abnormal skin pigmentation. Case report and Conclusion: This case report describes a dental management of a case of DC. Fluctuating vital and blood parameters and deteriorating overall health status were major challenges delivering dental treatment. Dental extractions of this patient were done while maintaining blood parameters by blood and platelet transfusion.

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Singh, Geeta, Dichen Palmo Bhutia, Diksha Singh, Jagdish Gamit, and U. Vignesh. "Dentigerous cyst of maxilla and mandible associated with ectopic teeth- a case report." International Journal of Dental Research 5, no. 2 (June 15, 2017): 98. http://dx.doi.org/10.14419/ijdr.v5i2.7700.

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Background: Dentigerous cyst (DC) is the second most common cyst of the jaw after radicular, affecting mostly the permanent dentition in the mandible (70%). DC Of maxillary sinus involving ectopic teeth is rare. Case details: We report a case of DC of maxillary sinus as well as anterior mandible associated with ectopic teeth, in a non-syndromic 8 years old boy who underwent cyst enucleation along with extraction of the involved teeth. Conclusion: DC affecting both maxilla and mandible is a less common entity. Treatment modality can range from enucleation to simple marsupilisation depending upon the extent of the lesion.

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Ren, Zheng, Long Zhang, Shao Jian Hu, Zhou Wei, and Yan Ling Shi. "A Novel Nano-Scale Multi-Finger MOSFET DC Model Parameters Extraction Method." Advanced Materials Research 588-589 (November 2012): 699–702. http://dx.doi.org/10.4028/www.scientific.net/amr.588-589.699.

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A novel Nano-scale scalable multi-finger RF MOSFET model extraction method is presented in this paper. First, Parasitic resistances induced by measuring probe are analyzed, according to which the extraction method of parasitic probe resistor are proposed. Secondly, it is proved that stress effects on the MOS channel scale with finger number. Moreover, Based on experiment data, it is concluded that several MOS instances, finger numbers, channel width and length highly affect the parasitic source and drain resistance of Multi-finger MOS. An empirical scalable model on them has been suggested. A complete flow of model parameters extraction and optimization on nano-scale multi-finger MOSFET is presented.

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Granger, Melanie, Emilie Samson, Severine Sauvage, Anisha Majumdar, Poonam Nigam, Lutfun Nahar, Sezgin Celik, and Satyajit Sarker. "Bioactivity of extracts of Centaurea polyclada dc. (Asteraceae)." Archives of Biological Sciences 61, no. 3 (2009): 447–52. http://dx.doi.org/10.2298/abs0903447g.

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The free radical-scavenging property, antibacterial activity, and brine shrimp toxicity of n-hexane, dichloromethane (DCM), and methanol (MeOH) extracts of Centaurea polyclada, an endemic Turkish species, were assessed using the 2,2-diphenyl-1-picryl-hydrazyl (DPPH) assay, the resazurin microtiter plate-based assay, and the brine shrimp lethality assay, respectively. The DCM and MeOH extracts of C. polyclada exhibited free radical-scavenging ability with RC50 values 1.17 and 0.015 mg/mL, respectively. Among solid-phase extraction fractions of the MeOH extract, the fraction eluted with 60% MeOH in water demonstrated the highest level of free radical-scavenging activity (RC50 = 0.016 mg/mL). Only the DCM extract showed considerable antibacterial activity against all nine test strains except Escherichia coli, with MIC ranging from 1.25 to 2.50 mg/mL. This antibacterial activity pattern was also observed with solid-phase extraction fractions of the DCM extract with varied potencies. None of the extracts showed any significant toxicity towards brine shrimps (LD50 = >1.00 mg/mL).

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Ramaputra, Muhammad Galih, Suhendro Yusuf Irianto, and Sri Karnila. "CONTENT BASED IMAGE RETRIEVAL METHOD WITH DISCRETE COSINE FEATURE EXTRACTION IN NATURAL IMAGES." Jurnal TAM (Technology Acceptance Model) 12, no. 2 (November 15, 2021): 171. http://dx.doi.org/10.56327/jurnaltam.v12i2.1092.

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Data or information at this time is not only presented in written form, but also in the form of images that require greater storage. Most of the images in the digital world use the JPEG format, where the Discrete Cosine Transform is the heart of the JPEG format, the use of DCT coefficients for indexing and image retrieval causes the retrieving process to be slower because more coefficients are processed compared to the DC coefficient method, which is only 1 /64 (1 DC coefficient) of the DCT coefficient. In this research, we perform Content Based Image Retrieval with DC feature extraction of 15,000 natural images, then calculate the distance between the images using the Manhattan Distance method. The final result of calculating precision and recall shows a value of 0.6624 and a time of less than 2 seconds, with a maximum value of 1.876 seconds.

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Lv, Zhongze, Ying Huang, Hu Guan, Jie Liu, Shuwu Zhang, and Yang Zheng. "Adaptive Video Watermarking against Scaling Attacks Based on Quantization Index Modulation." Electronics 10, no. 14 (July 12, 2021): 1655. http://dx.doi.org/10.3390/electronics10141655.

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Video watermarking plays a vital role in protecting the video copyright. The quantization-based methods are widely used in the existing watermarking algorithms, owing to their low computational complexity and completely blind extraction. However, most of them work poorly in resisting scaling attacks, by which the quantization value may fall outside the original quantization interval. For addressing this issue, an adaptive quantization index modulation method is proposed. The property that is associated with the ratio of the DC coefficient before and after scaling the video resolution motivates us to select the DC coefficient as the quantization value and set the size of the quantization interval by the video resolution to maintain the synchronization between them before and after scaling. Moreover, a strategy taking advantage of the high decoding reliability of the QRCode is proposed to terminate the extraction in advance, and both the embedding and the extracting process are performed in the spatial domain, which all contribute to further enhance the execution efficiency. The experimental results show that our algorithm outperforms the state-of-the-art method in terms of imperceptibility, robustness, and computational cost.

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Wang, Quandi, Zongyu An, Yali Zheng, and Yongming Yang. "Parameter extraction of conducted electromagnetic interference prediction model and optimisation design for a DC–DC converter system." IET Power Electronics 6, no. 7 (August 2013): 1449–61. http://dx.doi.org/10.1049/iet-pel.2013.0001.

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Kouihi, Manal, Mohamed Moutchou, and Abdelhafid Ait Elmahjoub. "Maximum Power Extraction of Solar PV system using DC-DC Buck converter and backstepping control based on P&O MPPT algorithm." E3S Web of Conferences 336 (2022): 00046. http://dx.doi.org/10.1051/e3sconf/202233600046.

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This paper presents the system allowing the extraction of maximum power from a sun based on solar photovoltaic module and backstepping control based on a P&O MPPT algorithm for a DC-DC buck converter. The aim of this research work is to determinate quickly the optimal PV Module working point which allowed to extract the maximum power. This work, based on a usage of a DC-DC buck converter to control the working point by adjusting PV voltage trough a duty cycle. In order to achieve our goal, we used the combination of perturb and observe (P&O) algorithm and DC-DC buck converter with backstepping control. This model was implemented in Matlab/Simulink software, the results of simulation prove its effectiveness in term of maximum power tracking dynamics for different irradiance and temperature profiles.

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Van, V., M. J. Deen, J. Kendall, D. S. Malhi, S. Voinigescu, and M. Schrofer. "DC extraction of the base and emitter resistances in polysilicon-emitter npn BJTs." Canadian Journal of Physics 74, S1 (December 1, 1996): 172–76. http://dx.doi.org/10.1139/p96-853.

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Five DC techniques of extracting the base and emitter resistances of polysilicon-emitter npn bipolar junction transistors (BJTs) are presented and compared. The five techniques include three previously published techniques and two new techniques, constant base current and IB–IE plane fitting. Application of the five methods to a 0.8 × 16 μm2 npn BJT shows that all but the method of impact ionization yield comparable Rc and Rbb values at high currents. The impact ionization method, which extracts Rc and Rbb in the impact ionization region and at low base currents, yields markedly different Rc and Rbb values, indicating that the values of the parasitic resistances depend on the current range over which the extraction is performed. Thus the choice of which method is best to use depends on the current range over which Rc and Rbb are to be measured, and the validity of the assumptions used in the method when applied to the device.

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Vora, Ragni, Ambika N. Joshi*, and Nitesh C. Joshi. "Comparison of extraction efficiency of various methods to extract L-DOPA from Mucuna pruriens (L.) DC." International Journal of Bioassays 6, no. 04 (April 2, 2017): 5343. http://dx.doi.org/10.21746/ijbio.2017.04.003.

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Mucuna pruriens seeds are noted to be a natural source of L-DOPA and are also used as a substitute for the synthetic L-DOPA. In the present study; attempts are made to develop suitable method(s) for extraction of L-DOPA from the powdered seeds of Mucuna pruriens using different solvents and conditions. The Seed powder was subjected to 7 different extraction methods and Method 1 was subjected to various solvent concentrations. Some methods used de-fatting procedure, either the method was cold maceration or in high temperature. Soxhlet extraction was also used in one of the extraction methods. All the extracts were analyzed using RP-HPLC. Mobile Phase used was Water: Methanol: AcetoNitrile (100:60:40) (v/v) containing 0.2% Triethylamine, pH = 3.3 and monitored at 280 nm with variable wavelength UV detector. The extraction was best with Methanol Water mixture in a cold maceration technique and overall gives good extraction efficiency of 13.36 % L-DOPA and id the best method giving highest extraction efficiency. The De-fatting method was the 2nd best methods giving approximately 8.8% L-DOPA and Method 5 viz, heat reflux method gives 8.7% L-DOPA making it the 3rd best method. There are not many studies done for optimization of extraction technique for L-DOPA despite an extensive work is reported for isolation, identification and pharmacological activities of L-DOPA from various plant sources. Keeping this in view, present investigation was done to study the extraction efficiency of various extraction methods of L-DOPA content in seed extracts of Mucuna pruriens and compare it.

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Jiao, Zhe, Hong Wei Chen, and Su Ling Zhang. "A Novel Extraction-Cleanup Method for Determination of Trace PPCPs in Water Samples." Advanced Materials Research 1035 (October 2014): 173–79. http://dx.doi.org/10.4028/www.scientific.net/amr.1035.173.

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In this contribution, a simple and sensitive extraction-cleanup method which was termed MAE-μ-SPE, was developed for the analysis of pharmaceutical and personal care products (PPCPs) in environmental water samples. The PPCPs included bisphenol A (BPA), diethyl phthalate (DEP), dibutyl phthalate (DBP), di (2-ethylhexyl) phthalate (DEHP), tetracycline (TC), deoxytetracycline (DC), oxytetracycline (OTC) and chloroteracycline (CTC). In this method, the PPCPs in the samples were extracted by microwave-assisted extraction (MAE) following adsorbed by copper (II) isonicotinate in micro-solid phase extraction (μ-SPE) device. The PPCPs were determined by high performance liquid chromatography with ultra-violet detector (HPLC-UV). The procedure of the MAE-μ-SPE was optimized in extraction temperature, extraction time, desorption time and desorption solvent. Analytical performances, such as limits of detection (in the range of 2.0-8.5 μg/L), quantification (in the range of 6.6-28.0 μg/L), and repeatability of the over-all procedure (less than 13%) were established. DEP, DBP, DEHP and TC studied in water samples were ranged from 18.2-68.8 μg L-1, while BPA, OTC, CTC and DC were found all below the detection limit in these samples.

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da Nóbrega, Andréa Bezerra, Bruno da Motta Lessa, Carlos Henrique Brasil Bizarri, Selma Ribeiro de Paiva, and Glaucia Barbosa Candido Alves Slana. "Comparison of betulinic acid extraction techniques from Eugenia florida DC (Myrtaeae) leaves." Journal of Applied Biotechnology & Bioengineering 9, no. 4 (August 23, 2022): 120–25. http://dx.doi.org/10.15406/jabb.2022.09.00298.

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Eugenia florida DC belongs to the Myrtaceae family. Previous phytochemical studies with leaves extracts of E. florida revealed the occurrence of triterpenes, such as betulinic acid (BA) which presents a vast literature with different biological activities: anti-inflammatory, antimalarial, antimicrobial, antiviral and anticancer. The objective of the present study was to evaluate the efficiency of different extraction methods (static maceration, dynamic maceration, percolation, soxhlet and ultrasonic waves) to extract BA from the leaves of Eugenia florida. The solvents and particle sizes were also evaluated. The results showed that the better solvents to extract BA were ethyl acetate and chloroform. The highest percentages of BA were obtained by percolation and maceration, probably due to the swelling of the plant material and the renewal of the solvent process. In the assays using different particle sizes of leaves of E. florida, relating to BA recovery and extraction yield, different extraction profiles were observed among the various solvents used. Ethyl acetate and chloroform showed no significant differences in both yields, however 50% of decreasing on extraction efficiency was observed when plant smaller particles were used with methanol and ethanol.

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Chen, Shi Long, Jia Wei Xie, Jie Zhang, and Li Liu. "Simulation Study on Transient Response of UHVDC Transmission Line Fault." Applied Mechanics and Materials 291-294 (February 2013): 2266–71. http://dx.doi.org/10.4028/www.scientific.net/amm.291-294.2266.

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The extraction and analysis of fault information is key to making the transmission line protection configuration scheme. This paper analyzes the mechanism of DC line faults, like lightning, mental and non-mental grounding fault, short to AC line. By referring to actual parameters of Yunnan-Guangdong ±800kV UHVDC transmission system, simulation model is established by PSCAD/EMTDC. According to simulation tests of dc transmission line faults: lightning, grounding fault, high resistance grounding fault and short to DC line, the transient responses of UHVDC line faults are summed up.

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Chankaya, Mukul, Ikhlaq Hussain, Aijaz Ahmad, Hasmat Malik, and Majed A. Alotaibi. "Stability Analysis of Chaotic Grey-Wolf Optimized Grid-Tied PV-Hybrid Storage System during Dynamic Conditions." Electronics 11, no. 4 (February 13, 2022): 567. http://dx.doi.org/10.3390/electronics11040567.

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This paper presents the stability improvement of the three-phase four-wire (3P-4W) grid-tied PV-hybrid energy storage system (HESS) using chaotic grew wolf optimization (CGWO) for DC bus voltage (Vdc) and AC bus voltage (Vpcc) control. The CGWO tuned fractional order proportional–integral (FOPI) controllers reduce the Vdc and Vpcc variations during diverse, dynamic conditions, i.e., sudden irradiation variations, deep voltage sag/swell, etc. The DC bus is responsible for the current injection/extraction control, maximum PV power extraction, bi-directional power flow, dc second-harmonics component elimination, and active power balance. At the point of common coupling (PCC), the AC bus is accountable for bi-directional power flow and active and reactive power control. The two-level voltage source converter (VSC) is controlled by a novel variable step-size incremental least mean square (VSS-ILMS) in zero voltage regulation (ZVR) mode. Due to its varying step size, VSC control is less prone to noise signals offers better stability, improved convergence rate, dc offset rejection, and tracking speed during dynamics, i.e., large oscillations. A battery and ultracapacitor are coupled to the DC link by buck-boost converters in the HESS. To regulate power transit between the DC bus and the grid, the HESS current control technique is designed to shift frequently from charging to discharging stage and vice versa. The novelty of the PV-HESS system lies in CGWO tuned VSS-ILMS control of VSC, which effectively and efficiently filter out the active fundamental constituents of load current and eliminate dc offset from VSC output. The HESS control maintains the DC bus voltage profile by absorbing and delivering energy (during dynamic conditions) rather than curtailing it. The presented system is simulated in a MATLAB/SIMULINK environment. The simulation results in graphical and numerical forms verify the stable and satisfactory operation of the proposed system as per IEEE519 standard.

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Al-Tannak, Naser F., Ahmed Hemdan, and Maya S. Eissa. "Development of a Robust UPLC Method for Simultaneous Determination of a Novel Combination of Sofosbuvir and Daclatasvir in Human Plasma: Clinical Application to Therapeutic Drug Monitoring." International Journal of Analytical Chemistry 2018 (October 21, 2018): 1–9. http://dx.doi.org/10.1155/2018/6535816.

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A rapid and selective UPLC-DAD method was developed and validated for simultaneous analysis of the novel two-drug combination Darvoni® for the treatment of HCV: Sofosbuvir (SF)/Daclatasvir (DC) in human plasma using Ledipasvir as internal standard (IS) where the extraction process was conducted using automated SPE. Although the analysis of the combination after concomitant oral intake of two tablets of SF and DC individually was reported in literature, yet simultaneous analysis of this new combination in human plasma after a single oral dose was not previously reported. The adopted chromatographic separation was achieved on Waters® Acquity UPLC BEH C18 column (2.1 × 50 mm, 1.7 µm) as a stationary phase using isocratic elution using a mobile phase system of ammonium formate (pH 3.5; 5 mM) and acetonitrile (60:40 v/v) pumped at a flow rate of 0.2 mL.min−1. The UV detection was carried out at 261 nm for SF and 318 nm for DC and IS. SF was eluted at 1.123 min while DC was eluted at 3.179 min. The proposed chromatographic method was validated in accordance with guidelines of FDA for bioanalytical method validation. A linear range was achieved in the range of 25-6400 and 50-12800 ng.mL−1 for SF and DC, respectively. The proposed UPLC-DAD method was found to be accurate with % bias ranging between -10.0-7.2 for SF and -6.9-8.0 for DC. Also it was proved to be precise with % CV for intraday precision ranging between 3.8-9.6 for SF and 2.8-9.2 for DC whereas interday precision ranged between 5.1-9.3 for SF and 3.7-9.1 for DC. Moreover, % extraction recovery ranged between 90.0-107.2 for SF and 93.1-108.0 for DC using the suggested method. The adopted chromatographic method was successfully applied to the therapeutic drug monitoring of SF and DC in healthy volunteers after the oral intake of one Darvoni® tablet.

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Samat, N. A. S. Abdul, U. Z. Kamarul Jaman, S. Saree, D. S. A. Mahmod, and J. C. H. Lai. "Characteristics of calcined palm oil pastes for biosilica extraction as a function of calcination temperatures." Journal of Applied Research and Technology 19, no. 1 (March 1, 2021): 23–34. http://dx.doi.org/10.22201/icat.24486736e.2021.19.1.1489.

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Palm oil production in Malaysia has increased over the years. As the consequence of high production of palm oil, surplus quantities of palm oil biomass wastes such as empty fruit bunches (EFB), palm kernel shell (PKS), and oil palm decanter cake (DC) are generated. Generally, these wastes are used as fuel to generate steam for boilers, which end up as ash. As several agricultural wastes are well-known to be rich in silica content, this study aims to investigate the bio-silica content of EFB, PKS and DC and their characteristics when calcined at various calcination temperatures from 400°C to 800°C. Several analyses were conducted such as weight loss, color, BET, SEM and FTIR. The results have shown that all samples favorably exhibited silica at higher temperatures, i.e., 800°C. Color analysis depicted that combustible elements were mostly removed at 800°C, leaving non-combusted silica in the waste ash. Weight loss analysis presented that EFB achieved the highest weight loss at 99.05%, followed by PKS at 95.65% and DC at 83.95%. This led to a relatively high amount or purity of silica in the sample. BET analysis showed highest surface area, 20.087m2/g (PKS) and the lowest is 9.492m2/g (DC) at 800°C which verified the high porosity of samples for further absorption applications. The presence of silica was also significantly observed in 800°C FTIR spectra for all waste samples. Overall, it is concluded that EFB, PKS, and DC are highly potential wastes to contribute to the production of bio-silica, which thus can be an option to overcome waste disposal issues in palm oil industries.

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Herbst, Gernot. "A Building-Block Approach to State-Space Modeling of DC-DC Converter Systems." J 2, no. 3 (July 8, 2019): 247–67. http://dx.doi.org/10.3390/j2030018.

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Small-signal models of DC-DC converters are often based on a state-space averaging approach, from which both control-oriented and other frequency-domain characteristics, such as input or output impedance, can be derived. Updating these models when extending the converter by filters or non-trivial loads, or adding control loops, can become a tedious task, however. To simplify this potentially error-prone process, a modular modeling approach is being proposed in this article. It consists of small state-space models for certain building blocks of a converter system on the one hand, and standardized operations for connecting these subsystem models to an overall converter system model on the other hand. The resulting state-space system model builds upon a two-port converter description and allows the extraction of control-oriented and impedance characteristics at any modeling stage, be it open loop or closed loop, single converter or series connections of converters. The ease of creating more complex models enabled by the proposed approach is also demonstrated with examples comprising multiple control loops or cascaded converters.

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Journal articles on the topic 'Dc extraction'

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