Log in

Relevant bibliographies by topics / Pseudo-R2 / Journal articles

To see the other types of publications on this topic, follow the link: Pseudo-R2.

Journal articles on the topic 'Pseudo-R2'

Author: Grafiati

Published: 4 June 2021

Last updated: 10 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Pseudo-R2.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Hemmert, Giselmar A. J., Laura M. Schons, Jan Wieseke, and Heiko Schimmelpfennig. "Log-likelihood-based Pseudo-R2 in Logistic Regression." Sociological Methods & Research 47, no. 3 (2016): 507–31. http://dx.doi.org/10.1177/0049124116638107.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Veall, Michael, and Klaus Zimmermann. "Pseudo-R2's in the ordinal probit model." Journal of Mathematical Sociology 16, no. 4 (1992): 333–42. http://dx.doi.org/10.1080/0022250x.1992.9990094.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Veall, Michael R., and Klaus F. Zimmermann. "Evaluating Pseudo-R2's for binary probit models." Quality & Quantity 28, no. 2 (1994): 151–64. http://dx.doi.org/10.1007/bf01102759.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Kataoka, Hiroshi, Mamiko Ohara, Toshio Mochizuki, et al. "Sex Differences in Time-Series Changes in Pseudo-R2 Values Regarding Hyperuricemia in Relation to the Kidney Prognosis." Journal of Personalized Medicine 10, no. 4 (2020): 248. http://dx.doi.org/10.3390/jpm10040248.

Full text

Abstract:

Studies on sex differences in time-series changes in pseudo-R2 values regarding hyperuricemia (HU) in relation to the kidney prognosis among patients with chronic kidney disease (CKD) are scant. The kidney prognosis was evaluated in 200 patients with CKD (median follow-up, 12.3 years). Survival analyses and logistic regression analyses were conducted, generating time-series pseudo-R2 values. We used four definitions of HU according to serum uric acid (SUA) levels (HU6, SUA ≥ 6.0 mg/dL; HU7, SUA ≥ 7.0 mg/dL; HU8, SUA ≥ 8.0 mg/dL) and antihyperuricemic agent use to calculate the mean and percent

APA, Harvard, Vancouver, ISO, and other styles

5

Grimm, Shawna, Tiffani Dawn Shelton, Charles David Goldman, and Jan Franko. "Prognostic value of preoperative surgical morbidity risk-stratification using morphometric data obtained from routine abdominal CT scans in the setting of pancreatic cancer resection." Journal of Clinical Oncology 31, no. 15_suppl (2013): e17599-e17599. http://dx.doi.org/10.1200/jco.2013.31.15_suppl.e17599.

Full text

Abstract:

e17599 Background: Patient frailty is imparative to surgical planning, post-operative morbidity and mortality, and ultimately the ability to undergo adjuvant therapy in cancer treatment. Sarcopenia has been correlated with long term survival in the setting of pancreatic resection for cancer. However, it has not been evaluated in the early post-operative setting. Here, we evaluate the prognostic value of morphometric parameters measured on abdominal CT scans in fifty patients undergoing pancreatic resections and comparing with postoperative complications. Methods: Post-operative complications o

APA, Harvard, Vancouver, ISO, and other styles

6

Spiess, Martin. "Evaluation of a pseudo-R2 measure for panel probit models." British Journal of Mathematical and Statistical Psychology 54, no. 2 (2001): 325–33. http://dx.doi.org/10.1348/000711001159591.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Anang, Michael Akrofi, Ruphino Zugle, and Baah Sefa-Ntiri. "Assessing the Adsorptive and Photodegradative Efficiencies of ZSM-11 Synthesized from Rice Husk Ash." Journal of Chemistry 2020 (September 9, 2020): 1–13. http://dx.doi.org/10.1155/2020/6094126.

Full text

Abstract:

Rice husk was used to synthesize zeolite (ZSM-11). FTIR and X-ray diffraction methods were used to characterize the product. The synthesized zeolite was used to treat underground water from some communities in Cape Coast considering parameters such as total dissolved solids, total hardness, conductivity, nitrate, and phosphate. The percentage reduction in PO43− was 96.1% in Ebubonko and 92.5% in Apewosika. Similarly, the NO3− levels also decreased significantly in Kwaprow. The adsorption capability was also determined by using it to remove Pb2+ and Zn2+ from laboratory prepared solutions with

APA, Harvard, Vancouver, ISO, and other styles

8

Wang, Guo-Hua, and Jianxin Wu. "Repetitive Reprediction Deep Decipher for Semi-Supervised Learning." Proceedings of the AAAI Conference on Artificial Intelligence 34, no. 04 (2020): 6170–77. http://dx.doi.org/10.1609/aaai.v34i04.6082.

Full text

Abstract:

Most recent semi-supervised deep learning (deep SSL) methods used a similar paradigm: use network predictions to update pseudo-labels and use pseudo-labels to update network parameters iteratively. However, they lack theoretical support and cannot explain why predictions are good candidates for pseudo-labels. In this paper, we propose a principled end-to-end framework named deep decipher (D2) for SSL. Within the D2 framework, we prove that pseudo-labels are related to network predictions by an exponential link function, which gives a theoretical support for using predictions as pseudo-labels.

APA, Harvard, Vancouver, ISO, and other styles

9

Laitila, Thomas. "A pseudo-R2 measure for limited and qualitative dependent variable models." Journal of Econometrics 56, no. 3 (1993): 341–55. http://dx.doi.org/10.1016/0304-4076(93)90125-o.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Moacă, Elena-Alina, Ciprian-Valentin Mihali, Ioana-Gabriela Macaşoi, et al. "Fe3O4@C Matrix with Tailorable Adsorption Capacities for Paracetamol and Acetylsalicylic Acid: Synthesis, Characterization, and Kinetic Modeling." Molecules 24, no. 9 (2019): 1727. http://dx.doi.org/10.3390/molecules24091727.

Full text

Abstract:

In this study Fe3O4@C matrix was obtained by combustion method and used hereafter as adsorbent for paracetamol and acetylsalicylic acid removal from aqueous solutions. The Fe3O4@C matrix was characterized by electronic microscopy, X-ray diffraction, thermal analysis, Fourier-transform infrared spectroscopy, and magnetic measurements. Two kinetic models of pseudo first-order and pseudo-second-order for both paracetamol and acetylsalicylic acid were studied. The experimental data were investigated by Langmuir, Freundlich, and Redlich–Peterson adsorption isotherm models. The adsorption followed t

APA, Harvard, Vancouver, ISO, and other styles

11

Isagba, E. S., S. Kadiri, and I. R. Ilaboya. "Yam Peels as Adsorbent for the Removal of Copper (Cu) and Manganese (Mn) in Waste Water." July 2017 1, no. 2 (2017): 230–43. http://dx.doi.org/10.36263/nijest.2017.02.0001.

Full text

Abstract:

This paper investigated the use of yam peel as a natural adsorbent for the removal of Copper (Cu) and Manganese (Mn) from waste water. The yam peels were thoroughly washed with distilled water, dried, pulverized and carbonized. The carbonized yam peel was then characterized for its particle sizes, moisture content, ash content, volatile matter, Methylene Blue number, Iodine number. The raw yam peels were prepared using the same procedure, but was not carbonized. The adsorption of Mn(II) and Cu(II) ions were investigated using adsorption experiment at room temperature. The effect of contact tim

APA, Harvard, Vancouver, ISO, and other styles

12

Lindfors, Matias, Caroline Lindblad, David W. Nelson, et al. "Prognostic performance of computerized tomography scoring systems in civilian penetrating traumatic brain injury: an observational study." Acta Neurochirurgica 161, no. 12 (2019): 2467–78. http://dx.doi.org/10.1007/s00701-019-04074-1.

Full text

Abstract:

Abstract Background The prognosis of penetrating traumatic brain injury (pTBI) is poor yet highly variable. Current computerized tomography (CT) severity scores are commonly not used for pTBI prognostication but may provide important clinical information in these cohorts. Methods All consecutive pTBI patients from two large neurotrauma databases (Helsinki 1999–2015, Stockholm 2005–2014) were included. Outcome measures were 6-month mortality and unfavorable outcome (Glasgow Outcome Scale 1–3). Admission head CT scans were assessed according to the following: Marshall CT classification, Rotterda

APA, Harvard, Vancouver, ISO, and other styles

13

KÜÇÜKARSLAN YÜZBAŞI, ZÜHAL. "New Characterizations for Pseudo Null and Partially Null Curves in 4 R2." Journal of the Institute of Science and Technology 7, no. 2 (2017): 277–84. http://dx.doi.org/10.21597/jist.2017.149.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Popescu (Hostuc), Ioana Carmen, Ligia Stoica, Carolina Constantin, and Ana Maria Stanescu. "Equilibrium and Kinetics of U(VI)aq Adsorption on in situ Generated Fe2O3. nH2O." Revista de Chimie 70, no. 10 (2019): 3482–85. http://dx.doi.org/10.37358/rc.19.10.7580.

Full text

Abstract:

The paper aims to present research results obtained at the study of equilibrium and kinetics of U(VI)aq sorption on in situ generated Fe2O3 x nH2O from model solutions. The studied systems represent U(VI) solutions with CU(VI) = 5-30 mg�L-1 for which maximum U(VI) removal efficiencies (%RU(VI) = 95.98) on in situ generated Fe2O3��nH2O were obtained in the following working conditions: pH = 8.75, tcontact = 30 min, [U(VI)] : [Fe(III)] =1:75 and stirring rate 250 RPM. The Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherm models were used to study U(VI) sorption equilibrium. Langmuir

APA, Harvard, Vancouver, ISO, and other styles

15

Mikkonen, Era D., Markus B. Skrifvars, Matti Reinikainen, et al. "Validation of prognostic models in intensive care unit–treated pediatric traumatic brain injury patients." Journal of Neurosurgery: Pediatrics 24, no. 3 (2019): 330–37. http://dx.doi.org/10.3171/2019.4.peds1983.

Full text

Abstract:

OBJECTIVEThere are few specific prognostic models specifically developed for the pediatric traumatic brain injury (TBI) population. In the present study, the authors tested the predictive performance of existing prognostic tools, originally developed for the adult TBI population, in pediatric TBI patients requiring stays in the ICU.METHODSThe authors used the Finnish Intensive Care Consortium database to identify pediatric patients (< 18 years of age) treated in 4 academic ICUs in Finland between 2003 and 2013. They tested the predictive performance of 4 classification systems—the Internati

APA, Harvard, Vancouver, ISO, and other styles

16

Son, Changgil, Wonyeol An, Geonhee Lee, Inho Jeong, Yong-Gu Lee, and Kangmin Chon. "Adsorption Characteristics of Phosphate Ions by Pristine, CaCl2 and FeCl3-Activated Biochars Originated from Tangerine Peels." Separations 8, no. 3 (2021): 32. http://dx.doi.org/10.3390/separations8030032.

Full text

Abstract:

This study has evaluated the removal efficiencies of phosphate ions (PO43−) using pristine (TB) and chemical-activated tangerine peel biochars. The adsorption kinetics and isotherm presented that the enhanced physicochemical properties of TB surface through the chemical activation with CaCl2 (CTB) and FeCl3 (FTB) were helpful in the adsorption capacities of PO43− (equilibrium adsorption capacity: FTB (1.655 mg g−1) > CTB (0.354 mg g−1) > TB (0.104 mg g−1)). The adsorption kinetics results revealed that PO43− removal by TB, CTB, and FTB was well fitted with the pseudo-second-order model (

APA, Harvard, Vancouver, ISO, and other styles

17

Chen, Jian Qiu, Zhi Liang Wang, Guo Ping Li, Rui Xin Guo, and Yu Zhu Hu. "Kinetics and Equilibrium Study for Acetazolamide in Soils." Advanced Materials Research 781-784 (September 2013): 2296–300. http://dx.doi.org/10.4028/www.scientific.net/amr.781-784.2296.

Full text

Abstract:

Sorption of Acetazolamide was found to be impacted by clay content and soil solution pH, with higher Kd values for soils with higher clay content and higher Kd values as the pH increased. Sorption data on soils were well fitted with Freundlich model (R2> 0.98). The kinetics of adsorption of Acetazolamide has been discussed using four kinetic models, i.e., the pseudo-first-order model, the pseudo-second-order model, the Elovich equation, the intraparticle diffusion model. The pseudo-first-order model and the pseudo-second-order model were both used to describe the kinetics data, and the pseu

APA, Harvard, Vancouver, ISO, and other styles

18

Shokoohi, Reza, Vahid Vatanpoor, Mansuor Zarrabi, and Akram Vatani. "Adsorption of Acid Red 18 (AR18) by Activated Carbon from Poplar Wood- A Kinetic and Equilibrium Study." E-Journal of Chemistry 7, no. 1 (2010): 65–72. http://dx.doi.org/10.1155/2010/958073.

Full text

Abstract:

Adsorption process by activated carbon is widely used for removal of dyes. Because of economical limits, activated carbon derived from low cost materials seem to be economical. The aim of this work is preparation of activated carbon from poplar wood and investigation of its ability to removal of (AR18) dye. In this work, we prepared the activated carbon by chemical activation method in electric furnace. In addition we have investigated effect of various parameters such as pH, contact time, dye concentration and adsorbent dosage on dye removal. Langmuir and Freundlich isotherm models have been

APA, Harvard, Vancouver, ISO, and other styles

19

Nnaji, Chidozie Charles, and Stephen Chinwike Emefu. "A comparative study of lead adsorption by activated Khaya Ivoresnsis and Pycanthus Angolensis sawdust." Journal of Water, Sanitation and Hygiene for Development 6, no. 4 (2016): 593–601. http://dx.doi.org/10.2166/washdev.2016.070.

Full text

Abstract:

Experiments investigating lead adsorption by activated sawdust of different particle sizes of two timber species were conducted. The experimental data were fitted to isothermal and kinetic models. The optimum particle size was 0.85 mm for Khaya ivorensis and 1.18 mm for Pycanthus angolensis. The adsorption of lead by Khaya ivorensis and Pycanthus angolensis conformed to the Langmuir isotherm (0.83 ≤ R2 ≤ 0.96 and 0.86 ≤ R2 ≤ 0.98, respectively) and Freundlich isotherm (0.69 ≤ R2 ≤ 0.97 and 0.94 ≤ R2 ≤ 1.0, respectively). The adsorption process for the two species of timber was controlled by so

APA, Harvard, Vancouver, ISO, and other styles

20

Thabede, Patience Mapule, Ntaote David Shooto, Thokozani Xaba, and Eliazer Bobby Naidoo. "Sulfuric Activated Carbon of Black Cumin (Nigella sativa L.) Seeds for the Removal of Cadmium(II) and Methylene Blue Dye." Asian Journal of Chemistry 32, no. 6 (2020): 1361–69. http://dx.doi.org/10.14233/ajchem.2020.22597.

Full text

Abstract:

Carbon from black cumin seeds was modified with 10 and 20% sulfuric acid to obtain the activated adsorbents. Pristine carbon from black cumin seeds, 10 and 20% H2SO4 activated carbon from black cumin seeds were labelled CBC, ACBC-10 and ACBC-20, respectively. The adsorbents were characterized by SEM, XRD, FTIR, TGA and BET. The adsorbents maximum trend for Cd(II) was ACBC-10 > ACBC-20 > CBC. The maximum capacity trend for methylene blue dye was ACBC-20 > ACBC-10 > CBC. The kinetic model best fitted pseudo second order for Cd(II) which gave r2 values of 0.991-0.998. The methylene bl

APA, Harvard, Vancouver, ISO, and other styles

21

Kataoka, Hiroshi, Toshio Mochizuki, Kazuhiro Iwadoh, et al. "Visceral to subcutaneous fat ratio as an indicator of a ≥30% eGFR decline in chronic kidney disease." PLOS ONE 15, no. 11 (2020): e0241626. http://dx.doi.org/10.1371/journal.pone.0241626.

Full text

Abstract:

Whether the visceral-to-subcutaneous fat ratio (V/S ratio) is associated with renal prognosis in patients with chronic kidney disease (CKD) remains unclear. Furthermore, little is known about the effect of sex and the absolute amount of visceral fat accumulation such as visceral fat area (VFA) ≥100 cm2 on the V/S ratio in relation to renal prognosis. In this study, 200 patients with CKD were evaluated for renal prognosis. Survival analyses and logistic regression analyses were conducted, generating time-series pseudo-R2 values. The mean and percent change of the pseudo-R2 values from the 6th y

APA, Harvard, Vancouver, ISO, and other styles

22

Yildiz, Sayiter. "Kinetic and Isotherm Analysis of Cu(II) Adsorption onto Almond Shell (Prunus Dulcis)." Ecological Chemistry and Engineering S 24, no. 1 (2017): 87–106. http://dx.doi.org/10.1515/eces-2017-0007.

Full text

Abstract:

Abstract In the work, adsorption of Cu2+ ions onto almond shell were investigated under different operational conditions. Almond shell was used without any pretreatment prior to the tests. The optimum conditions for adsorption of Cu2+ ions through almond shell were determined to be; pH 5.0, temperature 20°C, shaking rate 125 rpm, sorbent dose 0.3 g and initial Cu2+ ion concentration 50 mg/dm3. The equilibrium duration of the system was 60 minutes. The sorption capacities of the sorbents were predicted with the aid of equilibrium and kinetic models. The interactions of peanut shell with metal i

APA, Harvard, Vancouver, ISO, and other styles

23

Rahdar, Somayeh, Abbas Rahdar, Shahin Ahmadi, Zhara Mehdizadeh, and Mahmoud Taghavi. "Preparation, Physical Characterization and Adsorption Properties of Synthesized Co–Ni–Cr Nanocomposites for Highly Effective Removal of Nitrate: Isotherms, Kinetics and Thermodynamic Studies." Zeitschrift für Physikalische Chemie 234, no. 1 (2020): 45–62. http://dx.doi.org/10.1515/zpch-2019-1372.

Full text

Abstract:

AbstractIn the current effort, the Co–Ni–Cr Nanocomposites were synthesized by chemical method and characterized by means of scanning electron micrographs (SEM), X-ray diffraction (XRD), Fourier trans from infra-red (FTIR), and vibration sample magnetization (VSM). In the final step, these nanoparticles were used to study the nitrate removal efficiency from aqueous solution. The effect of important factor including pH, concentration of Nitrate (NO3−) ion, contact time and nanoparticle dose were studied in order to find the optimum adsorption conditions. A maximum of removal of the nitrate was

APA, Harvard, Vancouver, ISO, and other styles

24

Neagu, Mihaela, Daniela Roxana Popovici, Cristina Maria Dusescu, and Catalina Calin. "Adsorption of p-Cresol by Mesoporous Activated Carbon. I. Kinetics studies and data modeling." Revista de Chimie 68, no. 1 (2017): 139–42. http://dx.doi.org/10.37358/rc.17.1.5406.

Full text

Abstract:

The kinetic adsorption of p-cresol from aqueous solution onto mesoporous activated carbon was investigated for 100, 500 and 1000 mg L-1 initial concentrations, at constant 295 K temperature. The kinetic of the adsorption process was discussed using three kinetic models, i.e., pseudo-first order kinetic model, pseudo-second order kinetic model, and Avrami fractionary order kinetic model. In order to provide a mathematically rigorous method for evaluating the kinetic parameters using the original form of the kinetic models, the nonlinear regression was selected as most viable algorithm. The comm

APA, Harvard, Vancouver, ISO, and other styles

25

Del Vecchio, Paola, Nathalia K. Haro, Fernanda Siqueira Souza, Nilson Romeu Marcílio, and Liliana A. Féris. "Ampicillin removal by adsorption onto activated carbon: kinetics, equilibrium and thermodynamics." Water Science and Technology 79, no. 10 (2019): 2013–21. http://dx.doi.org/10.2166/wst.2019.205.

Full text

Abstract:

Abstract Pharmaceutical compounds are essential to preserve human and animal welfare, as well as to prevent illnesses. However, the elevated consumption of drugs, followed by incorrect disposal and inefficient wastewater treatment, may increase their environmental risk. In the case of antibiotics, such as ampicillin, some of the already known consequences are bacterial resistance and some toxic interactions with aquatic organisms. The scope of the present work is to investigate the removal of ampicillin through batch adsorption experiments onto granular activated carbon (GAC). The influence of

APA, Harvard, Vancouver, ISO, and other styles

26

Titah, Harmin Sulistiyaning, Siti Rozaimah Sheikh Abdullah, Mushrifah Idris, et al. "Arsenic Resistance and Biosorption by Isolated Rhizobacteria from the Roots of Ludwigia octovalvis." International Journal of Microbiology 2018 (December 30, 2018): 1–10. http://dx.doi.org/10.1155/2018/3101498.

Full text

Abstract:

Certain rhizobacteria can be applied to remove arsenic in the environment through bioremediation or phytoremediation. This study determines the minimum inhibitory concentration (MIC) of arsenic on identified rhizobacteria that were isolated from the roots of Ludwigia octovalvis (Jacq.) Raven. The arsenic biosorption capability of the was also analyzed. Among the 10 isolated rhizobacteria, five were Gram-positive (Arthrobacter globiformis, Bacillus megaterium, Bacillus cereus, Bacillus pumilus, and Staphylococcus lentus), and five were Gram-negative (Enterobacter asburiae, Sphingomonas paucimob

APA, Harvard, Vancouver, ISO, and other styles

27

Haque, Shaheriar, Sekhar Gain, Kaushik Gupta, and Uday Chand Ghosh. "Methylene blue (a cationic dye) adsorption performance of graphene oxide fabricated Fe-Al bimetal oxide composite from water." Water Quality Research Journal 54, no. 1 (2018): 57–69. http://dx.doi.org/10.2166/wqrj.2018.017.

Full text

Abstract:

Abstract Graphene oxide (GO) fabricated iron-aluminium oxide (GO@IAO) nanocomposite was synthesized with one-spot chemical reaction from emulsification of GO (1.0 g) in 0.2 L of 1.0 M mixed metal solution, which was characterized with some of the latest analytical tools aiming to assess methylene blue (MB) adsorption performance from aqueous solutions. Adsorption of MB on GO@IAO surfaces shows a steep increase from pH 3.0 to 5.0, but steepness declines at pH &gt;5.0. The closeness of fitted kinetic data with the pseudo-second order (PSO) equation (R2 = 0.9845) compared to the pseudo-first

APA, Harvard, Vancouver, ISO, and other styles

28

Park, Hyunjun, Jiseok Kim, Yong-Gu Lee, and Kangmin Chon. "Enhanced Adsorptive Removal of Dyes Using Mandarin Peel Biochars via Chemical Activation with NH4Cl and ZnCl2." Water 13, no. 11 (2021): 1495. http://dx.doi.org/10.3390/w13111495.

Full text

Abstract:

This study examined differences in the adsorption kinetics, isotherms, and thermodynamics of the dyes (methyl orange and fast green FCF) by pristine (M–biochar) and chemical activated mandarin peel biochars (MN–biochar and MZ–biochar). The specific surface area (1085.0 m2/g) and pore volume (0.194 cm3/g) of MZ-biochar much higher than those of the M–biochar (specific surface area = 8.5 m2/g, pore volume = 0.016 cm3/g) and MN–biochar (specific surface area = 181.1 m2/g, pore volume = 0.031 cm3/g). The equilibrium adsorption capacities (mg/g) of MO and FG using M–biochar (MO = 0.95, FG = 0.78) M

APA, Harvard, Vancouver, ISO, and other styles

29

Jalija, D. O., and A. Uzairu. "Adsorption of Cu (II) and Ni (II) Ions from Solution onto Calcium Alginate Beads." Journal of Applied Sciences and Environmental Management 24, no. 2 (2020): 329–33. http://dx.doi.org/10.4314/jasem.v24i2.20.

Full text

Abstract:

The objective of this study was to investigate the biosorption of Cu (II) and Ni (II) ions from aqueous solution by calcium alginate beads. The effects of solution pH, contact time and initial metal ion concentration were evaluated. The results showed that maximum Cu (II) removal (93.10%) occurred at pH of 9.0, contact time of 120 minutes and initial ion concentration of 10 mg/L while that of Ni (II) was 94.6%, which was achieved at pH of 8.0, contact time of 120 minutes and initial ion concentration of 10 mg/L. The equilibrium data fitted well to the Langmuir Isotherm indicating that the proc

APA, Harvard, Vancouver, ISO, and other styles

30

Tejada-Tovar, Candelaria, Ángel Villabona-Ortíz, and Ángel Darío Gonzalez-Delgado. "Adsorption of Azo-Anionic Dyes in a Solution Using Modified Coconut (Cocos nucifera) Mesocarp: Kinetic and Equilibrium Study." Water 13, no. 10 (2021): 1382. http://dx.doi.org/10.3390/w13101382.

Full text

Abstract:

The effect of adsorbent dose and initial concentration on removing the azo-anionic dyes Congo Red andtartrazine present in a synthetic aqueous solution was studied using natural cellulose (CC) and modified cationic cellulose (MCC) from coconut mesocarp. Three levels of adsorbent dosage (5, 8 and 12 mg/L) and initial concentration (40, 70 and 100 mg/L) were used. Cetyl trimethyl ammonium chloride (CTAC) was used as a modifying agent. TGA and DSC showed that the extracted cellulose was of good quality, composed mostly of cellulose with lignin and hemicellulose traces, and 8% moisture. The FTIR s

APA, Harvard, Vancouver, ISO, and other styles

31

Hargono, Hargono, Angga Mei Sarah, Feninda Nevrita, and Bakti Jos. "Kinetics and equilibriums adsorption of Cu (II) ion by chitosan and cross-linked chitosan-bentonite." Reaktor 19, no. 3 (2019): 117–24. http://dx.doi.org/10.14710/reaktor.19.3.117-124.

Full text

Abstract:

The sorption of Cu (II) particle from aqueous solution onto chitosan and cross-connected chitosan-bentonite (CTS-BTN) as adsorbent were conducted in batch conditions. The impact of different test parameters: starting pH, sorption time was assessed. Equilibrium studies have been completed to decide the limit of chitosan and CTS-BTN for Cu (II) particle. The Langmuir and Freundlich isotherm models were used in the examination of the trial information as linearized conditions. It was discovered that the isotherm information were all around portrayed by the Langmuir isotherm. Chitosan and CTS-BTN

APA, Harvard, Vancouver, ISO, and other styles

32

Muhammad, Ladifa H., and Muhammad B. Ibrahim. "Biosorption of iron by heavy-metal tolerant Micrococcus sp." Bayero Journal of Pure and Applied Sciences 11, no. 1 (2018): 102–9. http://dx.doi.org/10.4314/bajopas.v11i1.19.

Full text

Abstract:

The presence of metal ions in aqueous solutions represents, nowadays a major environmental problem. The present study investigates the potential adsorption capacity of Micrococcus sp. for the removal of iron (III) ions from aqueous solution. The adsorbent was characterized using FTIR analysis, in order to reveal the presence of functional groups. Batch adsorption experiments were carried out to evaluate the effect of process parameters such as pH, contact time, initial iron concentration, temperature and adsorbent dosage on removal capacity. The optimum removal of iron (III) ions was obtained

APA, Harvard, Vancouver, ISO, and other styles

33

Mandal, Ashanendu, Basab Brata Dey, and Sudip Kumar Das. "Thermodynamics, kinetics, and isotherms for phenol removal from wastewater using red mud." Water Practice and Technology 15, no. 3 (2020): 705–22. http://dx.doi.org/10.2166/wpt.2020.056.

Full text

Abstract:

Abstract The phenol removal through adsorption using industrial waste has been studied. The red mud generated as waste in the aluminum plants was used in this research. The surface characterizations of red mud were assessed. The batch experiment was investigated with pH (2–12), adsorption period (120–600 min), phenol content (40–200 mg/L), adsorbent dose (2–7 g/L), and temperature (30–50 °C). At the optimum operating condition, the percentage of phenol removal was 87.5%. The pseudo-second-order kinetic model (r2 = 0.98625–0.99994) fitted better than the pseudo-first-order kinetic model. The Fr

APA, Harvard, Vancouver, ISO, and other styles

34

Nagarajan, N., P. Gunasekaran, and P. Rajendran. "Genetic characterization, nickel tolerance, biosorption, kinetics, and uptake mechanism of a bacterium isolated from electroplating industrial effluent." Canadian Journal of Microbiology 61, no. 4 (2015): 297–306. http://dx.doi.org/10.1139/cjm-2014-0504.

Full text

Abstract:

Electroplating industries in Madurai city produce approximately 49 000 L of wastewater and 1200 L of sludge every day revealing 687–5569 ppm of nickel (Ni) with other contaminants. Seventeen Ni-tolerant bacterial strains were isolated from nutrient-enriched effluents. Among them one hyper Ni accumulating strain was scored and identified as Bacillus cereus VP17 on the basis of morphology, biochemical tests, 16S rDNA gene sequencing, and phylogenetic analysis. Equilibrium data of Ni(II) ions using the bacterium as sorbent at isothermal conditions (37 °C) and pH 6 were best adjusted by Langmuir (

APA, Harvard, Vancouver, ISO, and other styles

35

Bi, Yongguang, Yanshan Lu, Di Liu, and Xuemei Liu. "Tween 80 Modified Hydroxyapatite as an Adsorbent for Removal of Copper from Aqueous Solution." Nanoscience and Nanotechnology Letters 11, no. 9 (2019): 1305–12. http://dx.doi.org/10.1166/nnl.2019.30101305.

Full text

Abstract:

Hydroxyapatite was in this study modified with Tween 80 through ultrasound assisted chemical precipitation method. The Tween-modified hydroxyapatite (T-HA) was characterized by some analytical methods. T-HA particles were rod-shaped with an average length of 59 nm. The effect of contact time, pH, temperature, adsorbent dosage and initial concentration of Cu2+ on adsorption capacity were studied to determine the capacity of T-HA to adsorb copper ions. The removal efficiency for Cu2+ reached maximum (82.68%), at an initial concentration of Cu2+ of 200 mg/L and adsorbent dosage of 0.1 g at 35 °C

APA, Harvard, Vancouver, ISO, and other styles

36

Sayour, Alex Ali, Csilla Celeng, Attila Oláh, Mihály Ruppert, Béla Merkely, and Tamás Radovits. "Sodium–glucose cotransporter 2 inhibitors reduce myocardial infarct size in preclinical animal models of myocardial ischaemia–reperfusion injury: a meta-analysis." Diabetologia 64, no. 4 (2021): 737–48. http://dx.doi.org/10.1007/s00125-020-05359-2.

Full text

Abstract:

Abstract Aims/hypothesis Large cardiovascular outcome trials demonstrated that the cardioprotective effects of sodium–glucose cotransporter 2 (SGLT2) inhibitors might reach beyond glucose-lowering action. In this meta-analysis, we sought to evaluate the potential infarct size-modulating effect of SGLT2 inhibitors in preclinical studies. Methods In this preregistered meta-analysis (PROSPERO: CRD42020189124), we included placebo-controlled, interventional studies of small and large animal models of myocardial ischaemia–reperfusion injury, testing the effect of SGLT2 inhibitor treatment on myocar

APA, Harvard, Vancouver, ISO, and other styles

37

Ling, Sharain, Collin Joseph, and How Eng. "Biosorption of lead contaminated wastewater using cattails (Typha angustifolia) leaves: Kinetic studies." Journal of the Serbian Chemical Society 76, no. 7 (2011): 1037–47. http://dx.doi.org/10.2298/jsc100628084l.

Full text

Abstract:

In this work, dried leaves of Typha angustifolia (TA), also known as the common cattail, were used as an adsorbent in kinetic studies of Pb(II) adsorption from synthetic aqueous solutions. Batch adsorption studies with dried TA leaves were conducted and they were able to adsorb Pb(II) from 100 mL of a 25 mg L-1 Pb(II) solution effectively with the optimized dosage of 0.6 g. Adsorption equilibrium was achieved within 8 hours with an effective removal percentage of 86.04 %. Adsorption kinetics was further evaluated using four kinetic models, i.e., the pseudofirst order, pseudo-second order, intr

APA, Harvard, Vancouver, ISO, and other styles

38

Yildiz, Sayiter, and Selahattin Sevinç. "Heavy Metal Adsorption by Dewatered Iron-Containing Waste Sludge." Ecological Chemistry and Engineering S 25, no. 3 (2018): 431–56. http://dx.doi.org/10.1515/eces-2018-0030.

Full text

Abstract:

Abstract Drinking water treatment plants produce significant amounts of waste sludge. In this study, removal of Nickel ion by use of wastewater sludge was aimed. The adsorption capability of waste sludge was optimized with varying physical parameters such as pH, adsorbent dosage, adsorbate concentration, contact time, shaking speed and temperature. Initial concentration was set as 25 mg/dm3, absorbent dose was set as 0.3 g/cm3, and temperature was set as 25 °C. Compliance of balance data with Langmuir, Freundlich, Temkin and D-R isotherm models was investigated. The highest R2 values were obta

APA, Harvard, Vancouver, ISO, and other styles

39

Zdravkovic, Aleksandar, Novica Stankovic, Nebojsa Ristic, and Goran Petkovic. "Application of activated bentonite for the removal of direct and reactive dye from aqueous solutions." Chemical Industry and Chemical Engineering Quarterly 25, no. 4 (2019): 341–51. http://dx.doi.org/10.2298/ciceq171025012z.

Full text

Abstract:

The aim of this study was to determine adsorptive properties of acid activated bentonite clay for the removal of Direct Red 173 (DR 173) and Reactive Red 22 (RR 22) dyes from aqueous solutions. Raw and modified clay were characterized by the following methods: Fourier transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRPD), and scanning electron microscopy (SEM). The efficiency of activated clay adsorption was investigated depending on process parameters: the adsorbent dose, pH, temperature, initial dye concentration, and contact time. Experimental data were analyzed by Langmui

APA, Harvard, Vancouver, ISO, and other styles

40

Alabi, A. H., E. O. Oladele, A. J. O. Adeleke, F. C. Oni, and C. A. Olanrewaju. "Equilibrium, Kinetic and Thermodynamic Studies of Biosorption of Methylene Blue on Goethite Modified Baobab Fruit Pod (Adansonia Digitata L.)." Journal of Applied Sciences and Environmental Management 24, no. 7 (2020): 1229–43. http://dx.doi.org/10.4314/jasem.v24i7.16.

Full text

Abstract:

Methylene Blue (MB) was adsorbed from aqueous solution using Baobab (Adansonia digitata L.) fruit pod and its goethite modified form. Adsorbents were characterized using Fourier Transform-Infra Red (FTIR) spectroscopy and Scanning Electron Microscopy (SEM). Batch experiments were conducted at room temperature (26.8 °C) and the adsorption data were fitted using Langmuir, Freundlich, Temkin and Dubinin- Radushkevich isotherms. Also, kinetic data was fitted using Pseudo-first order, pseudo-second order, Elovich and intra-particle diffusion models. Goethite modified baobab (GMB) appeared to have a

APA, Harvard, Vancouver, ISO, and other styles

41

Aathithya, R., J. Rajani Sowparnika, and V. Balakrishnan. "Kinetic Studies for the Biosorption of Chromium Using Cherry Leaves (Muntingia calabura L.)." International Letters of Natural Sciences 25 (September 2014): 6–11. http://dx.doi.org/10.18052/www.scipress.com/ilns.25.6.

Full text

Abstract:

Biosorption is an attractive technology which is used for the sorption of substances by a biomaterial. In this present work the heavy metal chromium was subjected to biosorption because of their non-degradability nature and causes water and land pollution. Cherry leaves were used as a biomaterial for the biosorption. Kinetic studies were performed for the biosorption experiment. From the experiment it was found that the reaction follows pseudo first order reaction because of the larger value of regression coefficient R2 and lower value of standard errors (χ2) for pseudo first order reaction th

APA, Harvard, Vancouver, ISO, and other styles

42

Fushchich, V. I., A. F. Barannik, and Yu D. Moskalenko. "Exact solutions of the d'Alembert and Liouville equations in the pseudo-Euclidean space R2, 2. II." Ukrainian Mathematical Journal 42, no. 9 (1990): 1100–1106. http://dx.doi.org/10.1007/bf01056604.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Fushchich, V. I., A. F. Barannik, and Yu D. Moskalenko. "Exact solutions of the d'alembert and liouville equations in the pseudo-Euclidean space R2, 2� I." Ukrainian Mathematical Journal 42, no. 8 (1990): 1001–6. http://dx.doi.org/10.1007/bf01099234.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Al Mamun, Abdullah, Yehya M. Ahmed, Ma'an Fahmi R. AlKhatib, Ahmad Tariq Jameel, and Mohammed Abdul Hakeem Abdul Rahman AlSaadi. "Lead Sorption by Carbon Nanofibers Grown on Powdered Activated Carbon — Kinetics and Equilibrium." Nano 10, no. 02 (2015): 1550017. http://dx.doi.org/10.1142/s1793292015500174.

Full text

Abstract:

Carbon nanofibers (CNFs) were synthesized by using a safe and less hazardous method, compared to using floating catalysts in chemical vapor deposition (CVD) process. This process used C 2 H 2 as carbon source and oil palm kernel shell-based powdered activated carbon (PAC) as cheap solid substrate. Use of nickel ( Ni 2+) impregnated PAC as fixed substrate for the synthesis of CNF is one of the novelties of the research work accomplished by the authors. The PAC–CNFs porous nanocomposite product was used for the sorption of lead ions ( Pb 2+) from synthetic aqueous solution. Kinetics of Pb 2+ ads

APA, Harvard, Vancouver, ISO, and other styles

45

Sari, Fahriya Puspita, Dede Heri Yuli Yanto, and Gustan Pari. "Activated Carbon Derived From OPEFB by One Step Steam Activation and Its Application for Dye Adsorption : Kinetics and Isothermal Studies." Reaktor 19, no. 2 (2019): 68–76. http://dx.doi.org/10.14710/reaktor.19.2.68-76.

Full text

Abstract:

Activated carbon was prepared from OPEFB by one step steam activation method. The adsorption performance for the removal of acid orange 52 (AO 52), reactive blue 19 (RB 19), basic violet 1 (BV 1) was investigated. Each dye has a different chemical structure such as azoic, anthraquinone, triarylmethane for AO 52, RB 19, and BV 1 respectively. The effects of adsorbent dosage, pH, and contact time on the adsorption process were studied. Experimental data were analyzed by model equations such as Langmuir, Freundlich and Temkin isotherms and it was found that the Langmuir isotherm model best fitted

APA, Harvard, Vancouver, ISO, and other styles

46

Abd Al-Khodor, Yusra A., and Talib M. Albayati. "Adsorption Desulfurization of Actual Heavy Crude Oil Using Activated Carbon." Engineering and Technology Journal 38, no. 10A (2020): 1441–53. http://dx.doi.org/10.30684/etj.v38i10a.615.

Full text

Abstract:

The strict new regulations to reduce the sulfur content of fuel require new economical and efficient ways to remove the sulfur from the organic sulfur components. In the current work, sulfur was removed from the actual crude oil containing 2.5 wt.% from southern Iraq, specifically the Halfaya Oil Field was studied using adsorption desulfurization with activated carbon (AC). The effects of different operating conditions, including the dose of AC (0.2-1.0 gm), time (15–120 min) and temperature (30–50°C) were investigated. The best operating conditions were obtained as 0.8 gm AC, 90 minutes and 5

APA, Harvard, Vancouver, ISO, and other styles

47

Eyenubo, O. B., O. Peretomode, and S. A. Osakwe. "Biosorption of Cu(II) Ions from Aqueous Solution using Plantain Stalk (Musa Paradisiaca L.)." Nigerian Journal of Environmental Sciences and Technology 4, no. 2 (2020): 226–36. http://dx.doi.org/10.36263/nijest.2020.02.0202.

Full text

Abstract:

The study presents the adsorption of Cu (II) ions from aqueous solution by plantain stalk (musa paradisiacal) in relation to its equilibrium and kinetics characteristics, using batch adsorption method. The adsorbent was characterized using FTIR Spectrometry. The following functional groups were observed; hydroxyl, carbonyl, amine and phosphate groups which confirms the potential capability of sorption of the biosorbent. The study shows that there was optimum adsorption at pH 6.0 (75.41%) for Cu (II) ions. There was significant adsorption from the lowest to the highest time (5-180mins) and also

APA, Harvard, Vancouver, ISO, and other styles

48

Negi, Surindra, Vir Singh, and Jyoti Rawat. "GREEN SYNTHESIS OF SILVER NANOPARTICLES USING MICROALGAL EXTRACT AND ITS APPLICATION IN METAL ION REMOVAL FROM AQUEOUS SOLUTION." Journal of Experimental Biology and Agricultural Sciences 9, no. 2 (2021): 214–30. http://dx.doi.org/10.18006/2021.9(2).214.230.

Full text

Abstract:

Heavy metal pollution is of great concern and cannot be ignored as heavy metals are highly mobile in soil and are recalcitrant. Nanotechnology provides a novel sustainable approach for synthesizing materials of desired properties, composition, and structure, it is however expected to adsorb heavy metals and play a significant role in water treatment. Green chemistry is the cost-effective, non-toxic, and environment friendly approach that involves the use of biological components as reducing and stabilizing agents for the synthesis of nanoparticles. In the present study, heavy metals such as ca

APA, Harvard, Vancouver, ISO, and other styles

49

Moretti, Riccardo, Stefano Biffani, Francesco Tiezzi, Christian Maltecca, Stefania Chessa, and Riccardo Bozzi. "Rumination time as a potential predictor of common diseases in high-productive Holstein dairy cows." Journal of Dairy Research 84, no. 4 (2017): 385–90. http://dx.doi.org/10.1017/s0022029917000619.

Full text

Abstract:

We examined the hypothesis that rumination time (RT) could serve as a useful predictor of various common diseases of high producing dairy cows and hence improve herd management and animal wellbeing. We measured the changes in rumination time (RT) in the days before the recording of diseases (specifically: mastitis, reproductive system diseases, locomotor system issues, and gastroenteric diseases). We built predictive models to assess the association between RT and these diseases, using the former as the outcome variable, and to study the effects of the latter on the former. The average Pseudo-

APA, Harvard, Vancouver, ISO, and other styles

50

Anang, Michael A., Michael Oteng-Peprah, and Kwasi Opoku-Boadu. "Extraction and Characterisation of African Star Apple (Chrysophyllum albidum) Seed Oil and the Adsorptive Properties of the Fruit Shell in Ghana." International Journal of Food Science 2019 (April 1, 2019): 1–8. http://dx.doi.org/10.1155/2019/4959586.

Full text

Abstract:

This research work was undertaken to determine the physicochemical parameters of oil from the seeds of African Star Apple (Chrysophyllum albidum) and further evaluate the adsorptive properties of the fruit shell. The oil was extracted using hexane with the soxhlet apparatus at a temperature of 65°C for 4 hours. The results showed an average oil yield obtained of 11.6%, specific gravity of 0.92kg/m3, the refractive index of 1.464 at 30°C, an acid value of 7.72 mg KOH/g, a free fatty acid value of 3.16 g/100g, saponification value of 200.56 mg KOH/g, and an iodine value of 70.64 g/100g. A Fourie

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!