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Journal articles on the topic 'Back extraction'

Author: Grafiati

Published: 4 June 2021

Last updated: 5 February 2022

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1

Leyva, J. A. M. "Potential of Back-Extraction in Analytical Chemistry: Determination of Anions by Ligand-Exchange Back-Extraction." Microchemical Journal 48, no. 2 (October 1993): 123–36. http://dx.doi.org/10.1006/mchj.1993.1084.

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2

Al-Bazi, S. J., and Henry Freiser. "Kinetics and mechanism of back-extraction: selected palladium extraction systems." Analytica Chimica Acta 245 (1991): 225–33. http://dx.doi.org/10.1016/s0003-2670(00)80226-3.

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3

Weigl, Michael, Andreas Geist, Udo Müllich, and Klaus Gompper. "Kinetics of Americium(III) Extraction and Back Extraction with BTP." Solvent Extraction and Ion Exchange 24, no. 6 (December 2006): 845–60. http://dx.doi.org/10.1080/07366290600948582.

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4

Gao, D. L., Ya Fei Guo, Xiao Ping Yu, Shi Qiang Wang, and Tian Long Deng. "Ionic Liquid Extraction Methods for Alkali and Alkaline Earth Metal Ions." Advanced Materials Research 791-793 (September 2013): 224–27. http://dx.doi.org/10.4028/www.scientific.net/amr.791-793.224.

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Ionic liquids (ILs) have been considered as successful alternative extraction solvents, especially, they have become potential replacements of volatile organic compound in the extraction of metal ions for the properties of negligible vapor pressure, nonflammability, high thermostability, etc. In this paper, ILs as environmental friendly solvents in liquid-liquid extractions of alkali and alkaline earth metal ions were summarized, the part of extraction phase compositions, extraction conditions and back extraction method were discussed, and the potency of applications of ILs in extraction and separation of metal ions were also commented.

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5

Basu, R., R. Prasad, and K. K. Sirkar. "Nondispersive membrane solvent back extraction of Phenol." AIChE Journal 36, no. 3 (March 1990): 450–60. http://dx.doi.org/10.1002/aic.690360314.

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6

Verma, Parveen Kumar, and Prasanta Kumar Mohapatra. "Highly efficient separation of ruthenium from alkaline radioactive feeds using an anion exchange resin." Radiochimica Acta 108, no. 8 (August 27, 2020): 603–13. http://dx.doi.org/10.1515/ract-2019-3182.

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AbstractRuthenium recovery from the alkaline media was attempted using solid phase extraction. UV-Vis and X-ray absorption studies were performed to understand the ruthenium speciation under different conditions relevant to its extraction from alkaline medium. Since Ru forms anionic complex in the alkaline solution, an anion exchange resin (Dowex 1x8) was selected for its recovery from alkaline media. The precipitation of black RuO2 at the resin surface hinders its back exaction. Experimental conditions were optimized for the quantitative uptake of Ru from alkaline feed and its subsequent back extraction by a series of batch studies. About 90 % of the Ruthenium was back extracted from the resin using alkaline hypochlorite solution and nitric acid solution at different stages in the Ru back extraction cycle. The column studies were done under the optimized condition and showed ~80 % Ru recovery with 5 mL of the eluent (8 M HNO3) and ~90 % recovery in 10 mL including the tailing. The mechanism for the ruthenium extraction from alkaline medium and its back extraction from the resin was proposed.

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7

Backens, Miriam, Hector Miller-Bakewell, Giovanni de Felice, Leo Lobski, and John van de Wetering. "There and back again: A circuit extraction tale." Quantum 5 (March 25, 2021): 421. http://dx.doi.org/10.22331/q-2021-03-25-421.

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Translations between the quantum circuit model and the measurement-based one-way model are useful for verification and optimisation of quantum computations. They make crucial use of a property known as gflow. While gflow is defined for one-way computations allowing measurements in three different planes of the Bloch sphere, most research so far has focused on computations containing only measurements in the XY-plane. Here, we give the first circuit-extraction algorithm to work for one-way computations containing measurements in all three planes and having gflow. The algorithm is efficient and the resulting circuits do not contain ancillae. One-way computations are represented using the ZX-calculus, hence the algorithm also represents the most general known procedure for extracting circuits from ZX-diagrams. In developing this algorithm, we generalise several concepts and results previously known for computations containing only XY-plane measurements. We bring together several known rewrite rules for measurement patterns and formalise them in a unified notation using the ZX-calculus. These rules are used to simplify measurement patterns by reducing the number of qubits while preserving both the semantics and the existence of gflow. The results can be applied to circuit optimisation by translating circuits to patterns and back again.

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8

Arpa, Çiğdem, and Itır Aridaşir. "A Method to Determination of Lead Ions in Aqueous Samples: Ultrasound-Assisted Dispersive Liquid-Liquid Microextraction Method Based on Solidification of Floating Organic Drop and Back-Extraction Followed by FAAS." Journal of Analytical Methods in Chemistry 2018 (August 1, 2018): 1–7. http://dx.doi.org/10.1155/2018/8951028.

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Ultrasound-assisted dispersive liquid-liquid microextraction method based on solidification of floating organic drop and back-extraction (UA-DLLME-SFO-BE) technique was proposed for preconcentration of lead ions. In this technique, two SFODME steps are applied in sequence. The classical SFODME was applied as the first step and then the second (back-extraction) step was applied. For the classical SFODME, Pb ions were complexed with Congo red at pH 10.0 and then extracted into 1-dodecanol. After this stage, a second extraction step was performed instead of direct determination of the analyte ion in the classical method. For this purpose, the organic phase containing the extracted analyte ions is treated with 1.0 mol·L−1HNO3solution and then exposed to ultrasonication. So, the analyte ions were back-extracted into the aqueous phase. Finally, the analyte ions in the aqueous phase were determined by FAAS directly. Owing to the second extraction step, a clogging problem caused by 1-dodecanol during FAAS determination was avoided. Some parameters which affect the extraction efficiency such as pH, volume of extraction solvent, concentration of complexing agent, type, volume, and concentration of back-extraction solvent, effect of cationic surfactant addition, effect of temperature, and so on were examined. Performed experiments showed that optimum pH was 10.0, 1-dodecanol extraction solvent volume was 75 μL, back-extraction solvent was 500 μL, 1.0 mol·L−1HNO3, extraction time was 4 min, and extraction temperature was 40°C. Under optimum conditions, the enhancement factor, limit of detection, limit of quantification, and relative standard deviation were calculated as 81, 1.9 μg·L−1, 6.4 μg·L−1, and 3.4% (for 25 μg·L−1Pb2+), respectively.

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9

KAWAMOTO, Hiroshi, Hideyuki ITABASHI, and Mamoru NEMOTO. "Back-Extraction Rate of Bis(dithizonato)zinc(II)." Analytical Sciences 11, no. 2 (1995): 289–90. http://dx.doi.org/10.2116/analsci.11.289.

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10

Manescu, Ion Bogdan, Oana Pavelea, and Minodora Dobreanu. "Troubleshootings in RNA extraction – back to basic chemistry." Revista Romana de Medicina de Laborator 28, no. 4 (October 1, 2020): 441–45. http://dx.doi.org/10.2478/rrlm-2020-0034.

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11

Ma, Minhui, and Frederick F. Cantwell. "Solvent Microextraction with Simultaneous Back-Extraction for Sample Cleanup and Preconcentration: Quantitative Extraction." Analytical Chemistry 70, no. 18 (September 1998): 3912–19. http://dx.doi.org/10.1021/ac980174n.

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12

Ortiz, Inmaculada, Berta Galán, and Angel Irabien. "Kinetic Analysis of the Simultaneous Nondispersive Extraction and Back-Extraction of Chromium(VI)." Industrial & Engineering Chemistry Research 35, no. 4 (January 1996): 1369–77. http://dx.doi.org/10.1021/ie950433o.

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13

Hiruta, Yuki, Takafumi Watanabe, Etsuko Nakamura, Naoko Iwasawa, Hiroyasu Sato, Kensaku Hamada, Daniel Citterio, and Koji Suzuki. "Steric hindrance effects in tripodal ligands for extraction and back-extraction of Ag+." RSC Advances 4, no. 19 (2014): 9791. http://dx.doi.org/10.1039/c3ra45700a.

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14

Honjo, T., H. Kitayama, K. Terada, and T. Kiba. "Solid-liquid extraction and back extraction of metals with silica-immobilized 8-hydroxyquinoline." Fresenius' Zeitschrift für analytische Chemie 330, no. 2 (January 1988): 159–60. http://dx.doi.org/10.1007/bf00470733.

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15

Carneiro-da-Cunha, M. G., J. M. S. Cabral, and M. R. Aires-Barros. "Studies on the extraction and back-extraction of a recombinant cutinase in a reversed micellar extraction process." Bioprocess Engineering 11, no. 5 (October 1994): 203–8. http://dx.doi.org/10.1007/bf00369631.

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16

Kiyonga, Alice Nguvoko, Gyeongmin Hong, Hyun Su Kim, Young-Ger Suh, and Kiwon Jung. "Facile and Rapid Isolation of Oxypeucedanin Hydrate and Byakangelicin from Angelica dahurica by Using [Bmim]Tf2N Ionic Liquid." Molecules 26, no. 4 (February 5, 2021): 830. http://dx.doi.org/10.3390/molecules26040830.

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Ionic liquids (ILs) have sparked much interest as alternative solvents for plant materials as they provide distinctive properties. Therefore, in this study, the capacity of ILs to extract oxypeucedanin hydrate and byakangelicin from the roots of Angelica dahurica (A. dahurica) was investigated. The back-extraction method was examined to recover target components from the IL solution as well. Herein, [Bmim]Tf2N demonstrated outstanding performance for extracting oxypeucedanin hydrate and byakangelicin. Moreover, factors including solvent/solid ratio, extraction temperature and time were investigated and optimized using a statistical approach. Under optimum extraction conditions (solvent/solid ratio 8:1, temperature 60 °C and time 180 min), the yields of oxypeucedanin hydrate and byakangelicin were 98.06% and 99.52%, respectively. In addition, 0.01 N HCl showed the most significant ability to back-extract target components from the [Bmim]Tf2N solution. The total content of both oxypeucedanin hydrate (36.99%) and byakangelicin (45.12%) in the final product exceeded 80%. Based on the data, the proposed approach demonstrated satisfactory extraction ability, recovery and enrichment of target compounds in record time. Therefore, the developed approach is assumed essential to considerably reduce drawbacks encountered during the separation of oxypeucedanin hydrate and byakangelicin from the roots of A. dahurica.

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17

SHIMIZU, Tokuo, Keiichi FUKUDA, and Yoshio SHIJO. "Graphite furnace AAS determination of silver in seawater after solvent extraction and back extraction." Bunseki kagaku 43, no. 11 (1994): 1009–11. http://dx.doi.org/10.2116/bunsekikagaku.43.1009.

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18

Horäk, Tomáš, Vladimír Kellner, Jiří Čulík, Marie Jurková, and Pavel ČCejka. "Determination of Some Beer Flavours by Stir Bar Sorptive Extraction and Solvent Back Extraction." Journal of the Institute of Brewing 113, no. 2 (2007): 154–58. http://dx.doi.org/10.1002/j.2050-0416.2007.tb00272.x.

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19

Samaniego, Henar, M. Fresnedo San Román, and Inmaculada Ortiz. "Modelling of the Extraction and Back‐Extraction Equilibria of Zinc from Spent Pickling Solutions." Separation Science and Technology 41, no. 4 (April 2006): 757–69. http://dx.doi.org/10.1080/01496390600552289.

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20

Li, Xiangcun, Gaohong He, Chang Lin, and Hongjing Liu. "Study on the Extraction and Back Extraction of Bovine Serum Albumin using Reversed Micelles." Separation Science and Technology 42, no. 16 (December 2007): 3741–57. http://dx.doi.org/10.1080/01496390701626750.

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21

Fan, Xuebing, Xiaoping Yu, Yafei Guo, and Tianlong Deng. "Recovery of Boron from Underground Brine by Continuous Centrifugal Extraction with 2-Ethyl-1,3-hexanediol (EHD) and Its Mechanism." Journal of Chemistry 2018 (October 9, 2018): 1–8. http://dx.doi.org/10.1155/2018/7530837.

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In order to economical and environmental-friendly recycle of boron from underground brine, the extraction of boron was carried out in this work by the continuous centrifugal technique using 2-ethyl-1,3-hexanediol (EHD) + sulfonated kerosene (SK) extraction system, and the extraction mechanism was also investigated by the combination of FT-IR with slope method. The results showed that boron can be effectively extracted from underground water with the concentration of boron 5.43 g·L−1 by five-stage centrifugal extraction using 30% EHD + 70% SK at pH = 2.0–3.0, R(O/A) = 1 : 2, and the extraction rate reached 98.46%. Boron in the organic phase can be well five-stage back-extracted by 1.0 mol·L−1·NaOH at R(O/A) = 1 : 1 with a back-extraction rate of 97.00%. About 88.32% boron in the aqueous phase obtained by back-extraction can be recycled in H3BO3 form by evaporation crystallization after acidified to pH < 2.5. The extraction mechanism indicated that the extraction is completed mainly based on the esterification reaction between alcoholic hydroxyl in EHD and -OH in B(OH)3 at the stoichiometric ratio 1 : 1 to generate a stable six-membered ring structure of boric acid ester.

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22

Madhuluxmi, Madhuluxmi. "The link between gender and post-extraction complications of teeth." Bioinformation 16, no. 12 (December 31, 2020): 1128–33. http://dx.doi.org/10.6026/973206300161128.

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Extraction of teeth is a common procedure in dentistry. Recalling patients for monitoring wound healing is a concern in surgical procedures. It allows foreseeing signs or/and symptoms possibly related to surgical complications. Therefore, it is of interest to document the link between gender and complications in post extraction. The null hypothesis was age and gender had no impact on post dental extraction. We used patient records at Saveetha Dental College, India for this study. The overall follow-up rate post-extraction is less compared to known literature. Data shows that males outnumbered the females and those “above 40 years” than “below 40 years” in follow-up. Thus, we report that factors such as gender, age and the presence of a post-operative complication play a key role in determining whether a patient reports back for follow-up after routine extractions.

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23

Madhuluxmi, Madhuluxmi. "The link between gender and post-extraction complications of teeth." Bioinformation 16, no. 12 (December 31, 2020): 1128–33. http://dx.doi.org/10.6026/973206300161128.

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Extraction of teeth is a common procedure in dentistry. Recalling patients for monitoring wound healing is a concern in surgical procedures. It allows foreseeing signs or/and symptoms possibly related to surgical complications. Therefore, it is of interest to document the link between gender and complications in post extraction. The null hypothesis was age and gender had no impact on post dental extraction. We used patient records at Saveetha Dental College, India for this study. The overall follow-up rate post-extraction is less compared to known literature. Data shows that males outnumbered the females and those “above 40 years” than “below 40 years” in follow-up. Thus, we report that factors such as gender, age and the presence of a post-operative complication play a key role in determining whether a patient reports back for follow-up after routine extractions.

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24

Pan, S., G. S. Luo, J. G. Liu, and J. D. Wang. "Back‐Extraction of Carboxylic Acids by Two‐Phase Electrophoresis." Separation Science and Technology 38, no. 15 (January 10, 2003): 3731–46. http://dx.doi.org/10.1081/ss-120024226.

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25

Keshav, Amit, and Kailas L. Wasewar. "Back extraction of propionic acid from loaded organic phase." Chemical Engineering Science 65, no. 9 (May 2010): 2751–57. http://dx.doi.org/10.1016/j.ces.2010.01.010.

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26

Francavilla, Matteo, Mauro Marone, Paolo Marasco, Francesco Contillo, and Massimo Monteleone. "Artichoke Biorefinery: From Food to Advanced Technological Applications." Foods 10, no. 1 (January 7, 2021): 112. http://dx.doi.org/10.3390/foods10010112.

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A sequential extraction process has been designed for valorizing globe artichoke plant residues and waste (heads, leaves, stalks, and roots left in the field) by means of green extraction techniques according to a biorefinery approach. We investigated two cascading extractions based on microwave-assisted extractions (MAE) and green solvents (water and ethanol) that have been optimized for varying temperature, solvent and extraction time. In the first step, phenols were extracted with yields that ranged between 6.94 mg g−1 dw (in leaves) and 3.28 mg g−1 dw (in roots), and a phenols productivity of 175.74 Kg Ha−1. In the second step, inulin was extracted with impressive yields (42% dw), higher than other conventional inulin sources, corresponding to an inulin productivity of 4883.58 Kg Ha−1. The remaining residues were found to be valuable feedstocks both for bioenergy production and green manure (back to the field), closing the loop according to the Circular Economy paradigm.

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27

Francavilla, Matteo, Mauro Marone, Paolo Marasco, Francesco Contillo, and Massimo Monteleone. "Artichoke Biorefinery: From Food to Advanced Technological Applications." Foods 10, no. 1 (January 7, 2021): 112. http://dx.doi.org/10.3390/foods10010112.

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A sequential extraction process has been designed for valorizing globe artichoke plant residues and waste (heads, leaves, stalks, and roots left in the field) by means of green extraction techniques according to a biorefinery approach. We investigated two cascading extractions based on microwave-assisted extractions (MAE) and green solvents (water and ethanol) that have been optimized for varying temperature, solvent and extraction time. In the first step, phenols were extracted with yields that ranged between 6.94 mg g−1 dw (in leaves) and 3.28 mg g−1 dw (in roots), and a phenols productivity of 175.74 kg Ha−1. In the second step, inulin was extracted with impressive yields (42% dw), higher than other conventional inulin sources, corresponding to an inulin productivity of 4883.58 kg Ha−1. The remaining residues were found to be valuable feedstocks both for bioenergy production and green manure (back to the field), closing the loop according to the Circular Economy paradigm.

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28

Dinculescu, Daniel, and Vasile Lavric. "Mathematical Model of the Liquid Membrane Extractive Column. Sensitivity to Operating Parameters." Revista de Chimie 59, no. 3 (April 9, 2008): 336–45. http://dx.doi.org/10.37358/rc.08.3.1759.

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The extraction-back extraction column of low concentration species by means of an organic closed loop flow, considered as liquid membrane, was modelled then simulated, using some simplifying assumptions. The main hypotheses are: the aqueous phase is perfectly mixed, the drops of the organic phase are lumped into a plug-flow inner cylinder co-axial with the aqueous phase, and the organic phases under the sieve and on the top of the column are perfectly mixed also. The dynamic model of the extraction-back extraction column is, then, applied to the recovery of the hydrocarboxylic acids. The mathematical model, reduced through orthogonal collocation to a system of ordinary differential equations, was solved using a self-adaptive (RK)-type method. Its validation was done based on batch experimental data; the optimal model parameters (the specific mass transfer coefficients for both extraction and back-extraction zones), ensuring the agreement with the experiment, were found by means of a modified genetic algorithm technique. Then, a sensitivity analysis was done, to grasp the behaviour of the system with respect to the main operating parameters - the organic flow in the closed loop, the partition coefficient and the buffer volume.

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29

Li, Na, Yuzhi Wang, Kaijia Xu, Qian Wen, Xueqin Ding, Hongmei Zhang, and Qin Yang. "High-performance of deep eutectic solvent based aqueous bi-phasic systems for the extraction of DNA." RSC Advances 6, no. 87 (2016): 84406–14. http://dx.doi.org/10.1039/c6ra17689e.

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DES-based ABSs were initially applied to extraction and back extraction of DNA. The remarkable performance on selective separation of DNA and protein was evaluated. The binding characteristics and mechanism of extraction process were investigated.

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30

Liang, Rui, Zhilong Wang, Jian-He Xu, Wei Li, and Hanshi Qi. "Novel polyethylene glycol induced cloud point system for extraction and back-extraction of organic compounds." Separation and Purification Technology 66, no. 2 (April 2009): 248–56. http://dx.doi.org/10.1016/j.seppur.2009.01.001.

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31

Sipi, A. K. M., and S. H. Chang. "Extraction of Methylene Blue from Aqueous Solutions by Waste Cooking Oil and its Back-Extraction." IOP Conference Series: Materials Science and Engineering 811 (May 14, 2020): 012001. http://dx.doi.org/10.1088/1757-899x/811/1/012001.

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32

Yu, Tingting, and Xuejun Cao. "Effect of Chaotropes on Lipase Back Extraction Recovery in the Process of Reverse Micellar Extraction." Applied Biochemistry and Biotechnology 172, no. 6 (February 12, 2014): 3287–96. http://dx.doi.org/10.1007/s12010-014-0738-0.

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33

Dhaneshwar, Amrut D., Ram Saran Chaurasiya, and H. Umesh Hebbar. "Process optimization for reverse micellar extraction of stem bromelain with a focus on back extraction." Biotechnology Progress 30, no. 4 (March 20, 2014): 845–55. http://dx.doi.org/10.1002/btpr.1900.

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34

Mánuel, Victoria, Juan Pinto, Carolina Mendiguchía, and Carlos Moreno. "Solvent extraction with organophosphorus extractants in environmental samples: determination of cadmium(II) in natural water." Open Chemistry 12, no. 3 (March 1, 2014): 348–53. http://dx.doi.org/10.2478/s11532-013-0379-0.

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AbstractIn this work, Cd(II) extraction in natural waters by organophosphorus extractants as organic phase, as well as its back-extraction in an acidic media, has been studied. Cadmium extraction behavior at natural waters’ pH conditions (values in the range 7–8) was studied with two different extractants and co-ions, obtaining the highest extraction efficiency when using 0.1M Cyanex 272 in kerosene as organic phase and 0.1 M NO3 − as co-ion. Once they were selected, the effect on the extraction efficiency of sample pH, buffer concentration, extraction time, Cyanex 272 concentration as well as back-extractant concentration, was studied. The presence of the main inorganic and organic ligands in the sample was also studied, observing that extraction efficiency was affected most significantly when chlorides were present, with a decrease of about 14%, proving negligible for the others. Under the selected conditions, spiked real samples were successfully analyzed.

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35

Wang, Zuo, Wanyu Zang, Yeming Shi, Xingyu Zhu, Gaofeng Rao, Yang Wang, Junwei Chu, et al. "Extraction and Analysis of the Characteristic Parameters in Back‐to‐Back Connected Asymmetric Schottky Diode." physica status solidi (a) 217, no. 8 (February 26, 2020): 1901018. http://dx.doi.org/10.1002/pssa.201901018.

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36

Ales, Zacharie, Alexandre Pauchet, and Arnaud Knippel. "Extraction and Clustering of Two-Dimensional Dialogue Patterns." International Journal on Artificial Intelligence Tools 27, no. 02 (March 2018): 1850001. http://dx.doi.org/10.1142/s021821301850001x.

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This article proposes a two-step methodology to ease the identification of dialogue patterns in a corpus of annotated dialogues. The annotations of a given dialogue are represented within a two-dimensional array whose lines correspond to the utterances of the dialogue ordered chronologically. The first step of our methodology consists in extracting recurrent patterns. To that end, we adapt a dynamic programming algorithm used to align two-dimensional arrays by reducing its complexity and improving its trace-back procedure. During the second step, the obtained patterns are clustered using various heuristics from the literature. As evaluation process, our method is applied onto a corpus of annotated dialogues between a parent and her child in a storytelling context. The obtained partitions of dialogue patterns are evaluated by an expert in child development of language to assess how the methodology helps the expert into explaining the child behaviors. The influence of the method parameters (clustering heuristics, minimum extraction score, number of clusters and substitution score array) are studied. Dialogue patterns that manual extractions have failed to detect are highlighted by the method and the most efficient values of the parameters are therefore determined.

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37

Hou, Yufang, Yubao Hou, Liu Yanyan, Guang Qin, and Jichang Li. "Extraction and Purification of a Lectin from Red Kidney Bean and Preliminary Immune Function Studies of the Lectin and Four Chinese Herbal Polysaccharides." Journal of Biomedicine and Biotechnology 2010 (2010): 1–9. http://dx.doi.org/10.1155/2010/217342.

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Reversed micelles were used to extract lectin from red kidney beans and factors affecting reverse micellar systems (pH value, ionic strength and extraction time) were studied. The optimal conditions were extraction at pH 4–6, back extraction at pH 9–11, ion strength at 0.15 M NaCl, extraction for 4–6 minutes and back extraction for 8 minutes. The reverse micellar system was compared with traditional extraction methods and demonstrated to be a time-saving method for the extraction of red kidney bean lectin. Mitogenic activity of the lectin was reasonably good compared with commercial phytohemagglutinin (extracted fromPhaseolus vulgaris) Mitogenic properties of the lectin were enhanced when four Chinese herbal polysaccharides were applied concurrently, among which 50 μg/mLAstragalus mongholicuspolysaccharides (APS) with 12.5 μg/mL red kidney bean lectin yielded the highest mitogenic activity and 100 mg/kg/bw APS with 12.5 mg/kg/bw red kidney bean lectin elevated mouse nonspecific immunity.

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38

Li, Xiaoyi, Quanle Li, Aifang Xue, Hao Chen, and Shengqing Li. "Dispersive liquid–liquid microextraction coupled with single-drop microextraction for the fast determination of sulfonamides in environmental water samples by high performance liquid chromatography-ultraviolet detection." Analytical Methods 8, no. 3 (2016): 517–25. http://dx.doi.org/10.1039/c5ay02619a.

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39

Zaijun, Li, Peng Qiping, and Shan Haixia. "Use of a Novel Medium, the Ionic Liquid 1-Butyl-3-Trimethylsilylimidazolium Hexafluorophosphate, for LiquidLiquid Extraction of Lead in Water and Its Determination by Graphite Furnace Atomic Absorption Spectrometry." Journal of AOAC INTERNATIONAL 90, no. 4 (July 1, 2007): 1191–96. http://dx.doi.org/10.1093/jaoac/90.4.1191.

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Abstract The ionic liquid 1-butyl-3-trimethylsilylimidazolium hexafluorophosphate, abbreviated as [C4tmsim][PF6], was developed as a novel medium for liquidliquid extraction of lead(II) in water, in which dithizone was used as a metal chelator to form a neutral leaddithizone complex. Under optimal conditions, the complex was extracted into the [C4tmsim][PF6] phase from aqueous solution and back-extracted with nitric acid solution into the aqueous phase that was used directly for the subsequent determination of Pb. The system using the ionic liquid demonstrated good extraction performance; the extraction and back-extraction efficiencies were 99.8 and 99.7%, respectively, for Pb(II) at 20 g/L. The above procedure, including the extraction and back-extraction, was used to enrich trace levels of Pb(II) in a relatively large volume of water samples (1000 mL water), and an enrichment factor of 400 was obtained. The enrichment coupled with graphite furnace atomic absorption spectrometry was successfully applied to the determination of Pb in water. The calibration graph was linear at levels near the detection limits up to 100 ng/L Pb(II). The limits of quantitation and detection for lead in real water samples were 2.5 and 1.0 ng/L, respectively. Lead recoveries of 96.2103.8% from spiked samples demonstrate the accuracy of the proposed method.

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Md Sohaib Shahzan and Madhulaxmi Marimuthu. "Post extraction complications - An institution based retrospective study." International Journal of Research in Pharmaceutical Sciences 11, SPL3 (December 19, 2020): 1970–74. http://dx.doi.org/10.26452/ijrps.v11ispl3.3701.

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Tooth extraction is one of the most common procedures undertaken in the dental clinic. As with any surgical procedure, even a simple tooth extraction can result in complications. Post extraction complications can be annoying to the patient, thereby causing mild morbidity and have an impact on their quality of life. Complications are wide starting from common ones like alveolitis and root fracture, dry socket, infraction, halitosis, pain, trismus and uncommon ones like displacement of root fragments within the sinus and oral antral fistula. The aim of this study was to evaluate post-extraction complications among patients visiting saveetha dental college. This is a retrospective study. We reviewed patient records and analysed the data of 86000 patients between June 2019 and March 2020. From a pooled sample size of 23000 extractions done during this period, data of patients reporting for post-extraction complications were segregated and analysed. The statistical analysis was done using SPSS Version 20 by IBM. The results were analysed using the chi-square test. In this study, we observed that among a sample of 23000 simple extractions, only 42 patients had reported back with post-extraction complications (0.18%). These complications were more in males than in females. When compared between maxillary and mandibular arch, the mandible had more incidence with 54.16%. The most common complication was dry socket (58.34%). Pain as a complication was more in males than in females. Within the limits of the study, the incidence of post-extraction complication is more in males than females. Higher incidence of complication was seen in a mandibular arch (54.16%) than in maxillary arch (45.84%).

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Fileti, Ana Maria Frattini, Gilvan Anderson Fischer, José Carlos Curvelo Santana, and Elias Basile Tambourgi. "Batch and continuous extraction of bromelain enzyme by reversed micelles." Brazilian Archives of Biology and Technology 52, no. 5 (October 2009): 1225–34. http://dx.doi.org/10.1590/s1516-89132009000500021.

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The main aim of this study was to optimize the conditions for bromelain extraction by reversed micelles from pineapple juice (Ananas comosus). The purification was carried out in batch extraction and a micro-column with pulsed caps for continuous extraction. The cationic micellar solution was made of BDBAC as a surfactant, isooctane as a solvent and hexanol as a co-solvent. For the batch process, a purification factor of 3 times at the best values of surfactant agent, co-solvent and salt concentrations, pH of the back and forward extractions were, 100 mM, 10% v/v, 1 M, 3.5 and 8, respectively. For the continuous operation, independent variables optimal point was determined: ratio between light phase flow rate and total flow rate equal to 0.67 and 1 second for the time interval between the pulses. This optimal point led to a productivity of 1.29 mL/min and a purification factor of 4.96.

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Sharma, Neeraj, and Manish Mann. "Adaptive Keywords Extraction using Back Propagation Neural Networks- A Review." International Journal of Computer Applications 99, no. 10 (August 20, 2014): 32–34. http://dx.doi.org/10.5120/17410-7986.

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Gupta, Pooja, A. K. Sharma, and Divakar Yadav. "A Novel Technique for Back-Link Extraction and Relevance Evaluation." International Journal of Computer Science and Information Technology 3, no. 3 (June 18, 2011): 227–38. http://dx.doi.org/10.5121/ijcsit.2011.3316.

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Deshpande, Anand, Prashant P. Patavardhan, and D. H. Rao. "Iterated Back Projection Based Super-Resolution for Iris Feature Extraction." Procedia Computer Science 48 (2015): 269–75. http://dx.doi.org/10.1016/j.procs.2015.04.181.

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Li, Zhenkang, Zhiping Wang, Qiwei Yang, Zhiguo Zhang, Yiwen Yang, Qilong Ren, and Huabin Xing. "CO2-Assisted Back-Extraction Method for Ionic Liquid Biphasic Systems." ACS Sustainable Chemistry & Engineering 4, no. 8 (July 14, 2016): 4403–10. http://dx.doi.org/10.1021/acssuschemeng.6b00997.

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Tong, Yanping, Makoto Hirata, Hirokazu Takanashi, and Tadashi Hano. "Back extraction of lactic acid with microporous hollow fiber membrane." Journal of Membrane Science 157, no. 2 (May 1999): 189–98. http://dx.doi.org/10.1016/s0376-7388(98)00378-0.

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Jiménez de Blas, Oroncio, Jose Luis Pereda de Paz, and Jesús Hernández Méndez. "Indirect atomic absorption spectrometric determination of dimethoxydithiophosphate with back-extraction." Analyst 114, no. 12 (1989): 1675–77. http://dx.doi.org/10.1039/an9891401675.

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Kumar, P. Anil, and B. Anuradha. "Reflectivity Parameter Extraction from RADAR Images Using Back Propagation Algorithm." International Journal of Electrical and Computer Engineering (IJECE) 8, no. 5 (October 1, 2018): 2795. http://dx.doi.org/10.11591/ijece.v8i5.pp2795-2803.

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<p class="Abstract">Pattern recognition has been acknowledged as one of the promising research areas and it has drawn the awareness among many researchers since its existence at the beginning of the nineties. Multilayer Neural networks are used in pattern Recognition and classification based on the features derived from the input patterns. The Reflectivity information extracted from the Doppler Weather Radar (DWR) image helps in identifying the convective cloud type which has a strong relation to the precipitation rate. The reflectivity information is rooted in the DWR image with the help of colors and color bar is provided to distinguish among different reflectivity information. Artificial Neural network predicts the color based on the maximum likelihood estimation problem. This paper presents a best possible backpropagation algorithm for color identification in DWR images by comparing various backpropagation algorithms such as LevenbergMarquardt, Conjugate gradient, and Resilient back propagation etc.,. Pattern recognition using Neural networks presents better results compared to standard distance measures. It is observed that Levenberg-Marquardt backpropagation algorithm yields a regression value of 99% approximately and accuracy of 98%</p>

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Jiang, Jian-Hui, Ji-Hong Wang, Xia Chu, and Ru-Qin Yu. "Non-linear discriminant feature extraction using generalized back-propagation network." Journal of Chemometrics 10, no. 4 (July 1996): 281–94. http://dx.doi.org/10.1002/(sici)1099-128x(199607)10:4<281::aid-cem417>3.0.co;2-d.

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Poczynajło, A. "Studies on reductive back extraction of plutonium in Purex process." Journal of Radioanalytical and Nuclear Chemistry Articles 125, no. 2 (December 1988): 445–65. http://dx.doi.org/10.1007/bf02041702.

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