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Journal articles on the topic 'Heterogeneous treatment effect'

Author: Grafiati

Published: 4 June 2021

Last updated: 8 February 2022

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1

Tran, Christopher, and Elena Zheleva. "Learning Triggers for Heterogeneous Treatment Effects." Proceedings of the AAAI Conference on Artificial Intelligence 33 (July 17, 2019): 5183–90. http://dx.doi.org/10.1609/aaai.v33i01.33015183.

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The causal effect of a treatment can vary from person to person based on their individual characteristics and predispositions. Mining for patterns of individual-level effect differences, a problem known as heterogeneous treatment effect estimation, has many important applications, from precision medicine to recommender systems. In this paper we define and study a variant of this problem in which an individuallevel threshold in treatment needs to be reached, in order to trigger an effect. One of the main contributions of our work is that we do not only estimate heterogeneous treatment effects w

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2

Grimmer, Justin, Solomon Messing, and Sean J. Westwood. "Estimating Heterogeneous Treatment Effects and the Effects of Heterogeneous Treatments with Ensemble Methods." Political Analysis 25, no. 4 (2017): 413–34. http://dx.doi.org/10.1017/pan.2017.15.

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Randomized experiments are increasingly used to study political phenomena because they can credibly estimate the average effect of a treatment on a population of interest. But political scientists are often interested in how effects vary across subpopulations—heterogeneous treatment effects—and how differences in the content of the treatment affects responses—the response to heterogeneous treatments. Several new methods have been introduced to estimate heterogeneous effects, but it is difficult to know if a method will perform well for a particular data set. Rather than using only one method,

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Coppock, Alexander, Thomas J. Leeper, and Kevin J. Mullinix. "Generalizability of heterogeneous treatment effect estimates across samples." Proceedings of the National Academy of Sciences 115, no. 49 (2018): 12441–46. http://dx.doi.org/10.1073/pnas.1808083115.

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The extent to which survey experiments conducted with nonrepresentative convenience samples are generalizable to target populations depends critically on the degree of treatment effect heterogeneity. Recent inquiries have found a strong correspondence between sample average treatment effects estimated in nationally representative experiments and in replication studies conducted with convenience samples. We consider here two possible explanations: low levels of effect heterogeneity or high levels of effect heterogeneity that are unrelated to selection into the convenience sample. We analyze sub

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4

MaCurdy, Thomas, Xiaohong Chen, and Han Hong. "Flexible Estimation of Treatment Effect Parameters." American Economic Review 101, no. 3 (2011): 544–51. http://dx.doi.org/10.1257/aer.101.3.544.

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A variety of identification strategies have a common cell structure, in which the observed heterogeneity of the regression defines a partition of the sample into cells. Typically in the presence of exogenous covariates that define the cell structure, identification assumptions are imposed conditional on each value of the covariate, or cell by cell. Treatment effects across cells are typically heterogeneous. Researchers might be interested in unconditional parameters which are the averaged treatment effects across the cells. Alternatively, treatment effects can be estimated more efficiently if

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5

Brooks, John M., Cole G. Chapman, and Mary C. Schroeder. "Understanding Treatment Effect Estimates When Treatment Effects Are Heterogeneous for More Than One Outcome." Applied Health Economics and Health Policy 16, no. 3 (2018): 381–93. http://dx.doi.org/10.1007/s40258-018-0380-z.

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Athey, Susan, and Guido Imbens. "Recursive partitioning for heterogeneous causal effects." Proceedings of the National Academy of Sciences 113, no. 27 (2016): 7353–60. http://dx.doi.org/10.1073/pnas.1510489113.

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In this paper we propose methods for estimating heterogeneity in causal effects in experimental and observational studies and for conducting hypothesis tests about the magnitude of differences in treatment effects across subsets of the population. We provide a data-driven approach to partition the data into subpopulations that differ in the magnitude of their treatment effects. The approach enables the construction of valid confidence intervals for treatment effects, even with many covariates relative to the sample size, and without “sparsity” assumptions. We propose an “honest” approach to es

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7

Gao, Zijun, Trevor Hastie, and Robert Tibshirani. "Assessment of heterogeneous treatment effect estimation accuracy via matching." Statistics in Medicine 40, no. 17 (2021): 3990–4013. http://dx.doi.org/10.1002/sim.9010.

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Huntington-Klein, Nick. "Instruments with Heterogeneous Effects: Bias, Monotonicity, and Localness." Journal of Causal Inference 8, no. 1 (2020): 182–208. http://dx.doi.org/10.1515/jci-2020-0011.

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AbstractIn Instrumental Variables (IV) estimation, the effect of an instrument on an endogenous variable may vary across the sample. In this case, IV produces a local average treatment effect (LATE), and if monotonicity does not hold, then no effect of interest is identified. In this paper, I calculate the weighted average of treatment effects that is identified under general first-stage effect heterogeneity, which is generally not the average treatment effect among those affected by the instrument. I then describe a simple set of data-driven approaches to modeling variation in the effect of t

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9

Yu, Miao, Wenbin Lu, and Rui Song. "A New Framework for Online Testing of Heterogeneous Treatment Effect." Proceedings of the AAAI Conference on Artificial Intelligence 34, no. 06 (2020): 10310–17. http://dx.doi.org/10.1609/aaai.v34i06.6594.

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We propose a new framework for online testing of heterogeneous treatment effects. The proposed test, named sequential score test (SST), is able to control type I error under continuous monitoring and detect multi-dimensional heterogeneous treatment effects. We provide an online p-value calculation for SST, making it convenient for continuous monitoring, and extend our tests to online multiple testing settings by controlling the false discovery rate. We examine the empirical performance of the proposed tests and compare them with a state-of-art online test, named mSPRT using simulations and a r

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10

Bae, Sunjae. "Is Variance Ratio a Valid Indicator of Heterogeneous Treatment Effect?" JAMA Psychiatry 77, no. 2 (2020): 216. http://dx.doi.org/10.1001/jamapsychiatry.2019.3372.

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11

Roy, Ranadhir, Daniel N. Riahi, and Jorge Cisneros. "Effect of Combined Anticancer Drugs Treatment on Heterogeneous Brain Tumors." International Journal of Applied and Computational Mathematics 3, no. 4 (2017): 3877–96. http://dx.doi.org/10.1007/s40819-017-0331-7.

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12

Zhu, Jie, and Blanca Gallego. "Targeted estimation of heterogeneous treatment effect in observational survival analysis." Journal of Biomedical Informatics 107 (July 2020): 103474. http://dx.doi.org/10.1016/j.jbi.2020.103474.

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13

Powers, Scott, Junyang Qian, Kenneth Jung, et al. "Some methods for heterogeneous treatment effect estimation in high dimensions." Statistics in Medicine 37, no. 11 (2018): 1767–87. http://dx.doi.org/10.1002/sim.7623.

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14

Lin, Jie, Ying Min Wu, and Yan Hua Lu. "Study on Reactive Dye Wastewater Treatment with Quaternary Chitosan." Advanced Materials Research 881-883 (January 2014): 525–28. http://dx.doi.org/10.4028/www.scientific.net/amr.881-883.525.

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Chitosan quaternary ammonium salt is synthesized by means of heterogeneous reaction, and then applied to treat reactive dye waste water. Effects of flocculation factors on treatment waste water are discussed. The results show that, the quaternary ammonium salt of chitosan concentration and settling time have great effects on the flocculation effect, and the stirring manner has little effect on flocculation.

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15

Winkelbeiner, Stephanie, and Philipp Homan. "Is Variance Ratio a Valid Indicator of Heterogeneous Treatment Effect?—Reply." JAMA Psychiatry 77, no. 2 (2020): 217. http://dx.doi.org/10.1001/jamapsychiatry.2019.3382.

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16

Hu, Liangyuan, Jiayi Ji, and Fan Li. "Estimating heterogeneous survival treatment effect in observational data using machine learning." Statistics in Medicine 40, no. 21 (2021): 4691–713. http://dx.doi.org/10.1002/sim.9090.

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17

Goulart, Bianca Veloso, Patrícia Maralyne Lopes Lisboa Fagundes, Amanda Rosa Peres, et al. "Heterogeneous photodegradation of bisphenol A and ecotoxicological evaluation post treatment." Eclética Química Journal 46, no. 2 (2021): 48–56. http://dx.doi.org/10.26850/1678-4618eqj.v46.2.2021.p48-56.

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Bisphenol A (BPA) is an emerging pollutant with endocrine disrupting properties that can be found at trace levels in various aqueous environments. Conventional water and wastewater treatments are not designed to efficiently remove these substances. Therefore, this work investigates the removal of BPA by an Advanced Oxidation Process (AOP), specifically heterogeneous photocatalysis using TiO2. The influences of the TiO2 concentration (1.0–10.0 mg L-1), pH (5.3 and 8.5) and effects matrix composition were studied for the removal of BPA at a concentration of 0.8 mg L-1. The results indicated that

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18

Ban, F. C., X. T. Zheng, and H. Y. Zhang. "Photo-assisted heterogeneous Fenton-like process for treatment of PNP wastewater." Journal of Water, Sanitation and Hygiene for Development 10, no. 1 (2020): 136–45. http://dx.doi.org/10.2166/washdev.2020.087.

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Abstract The purpose of this study was to investigate the effect of photo-assisted heterogeneous Fenton on p-nitrophenol (PNP) wastewater treatment by a homemade reactor. Supported Fe-Ce/Al2O3 was used as a catalyst and H2O2 as an oxidant to treat simulated p-nitrophenol wastewater under ultraviolet light. The effects of H2O2 dosage, catalyst dosage, initial solution pH value, reaction temperature and reaction time on the removal rate of p-nitrophenol in a photo-assisted heterogeneous Fenton system were determined. According to the relation between the concentration of each component and time,

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19

Künzel, Sören R., Jasjeet S. Sekhon, Peter J. Bickel, and Bin Yu. "Metalearners for estimating heterogeneous treatment effects using machine learning." Proceedings of the National Academy of Sciences 116, no. 10 (2019): 4156–65. http://dx.doi.org/10.1073/pnas.1804597116.

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There is growing interest in estimating and analyzing heterogeneous treatment effects in experimental and observational studies. We describe a number of metaalgorithms that can take advantage of any supervised learning or regression method in machine learning and statistics to estimate the conditional average treatment effect (CATE) function. Metaalgorithms build on base algorithms—such as random forests (RFs), Bayesian additive regression trees (BARTs), or neural networks—to estimate the CATE, a function that the base algorithms are not designed to estimate directly. We introduce a metaalgori

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20

Lee, Soohyung, and Azeem M. Shaikh. "MULTIPLE TESTING AND HETEROGENEOUS TREATMENT EFFECTS: RE-EVALUATING THE EFFECT OF PROGRESA ON SCHOOL ENROLLMENT." Journal of Applied Econometrics 29, no. 4 (2013): 612–26. http://dx.doi.org/10.1002/jae.2327.

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21

Chen, Chi-Tian, H. M. James Hung, and Chin-Fu Hsiao. "Design and Evaluation of Multiregional Trials with Heterogeneous Treatment Effect Across Regions." Journal of Biopharmaceutical Statistics 22, no. 5 (2012): 1037–50. http://dx.doi.org/10.1080/10543406.2012.701585.

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22

Liu, Shenglong, Ismael Mourifié, and Yuanyuan Wan. "Two-way exclusion restrictions in models with heterogeneous treatment effects." Econometrics Journal 23, no. 3 (2020): 345–62. http://dx.doi.org/10.1093/ectj/utaa013.

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Summary In this paper, we propose a novel method to identify the conditional average treatment effect partial derivative (CATE-PD) in an environment in which the treatment is endogenous, the treatment effect is heterogeneous, the candidate 'instrumental variables' can be correlated with latent errors, and the treatment selection does not need to be (weakly) monotone. We show that CATE-PD is point-identified under mild conditions if two-way exclusion restrictions exist: (a) an outcome-exclusive variable, which affects the treatment but is excluded from the potential outcome equation, and (b) a

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23

Zhou, Xiang, and Yu Xie. "Heterogeneous Treatment Effects in the Presence of Self-Selection: A Propensity Score Perspective." Sociological Methodology 50, no. 1 (2019): 350–85. http://dx.doi.org/10.1177/0081175019862593.

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An essential feature common to all empirical social research is variability across units of analysis. Individuals differ not only in background characteristics but also in how they respond to a particular treatment, intervention, or stimulation. Moreover, individuals may self-select into treatment on the basis of anticipated treatment effects. To study heterogeneous treatment effects in the presence of self-selection, Heckman and Vytlacil developed a structural approach that builds on the marginal treatment effect (MTE). In this article, we extend the MTE-based approach through a redefinition

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24

Park, Tae-Ryong, John M. Brooks, Elizabeth A. Chrischilles, and George Bergus. "Estimating the Effect of Treatment Rate Changes When Treatment Benefits Are Heterogeneous: Antibiotics and Otitis Media." Value in Health 11, no. 2 (2008): 304–14. http://dx.doi.org/10.1111/j.1524-4733.2007.00234.x.

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25

Caracciolo, Francesco, and Marilena Furno. "Quantile treatment effect and double robust estimators." Journal of Economic Studies 44, no. 4 (2017): 585–604. http://dx.doi.org/10.1108/jes-02-2016-0026.

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Purpose Several approaches have been proposed to evaluate treatment effect, relying on matching methods propensity score, quantile regression, influence function, bootstrap and various combinations of the above. This paper considers two of these approaches to define the quantile double robust (DR) estimator: the inverse propensity score weights, to compare potential output of treated and untreated groups; the Machado and Mata quantile decomposition approach to compute the unconditional quantiles within each group – treated and control. Two Monte Carlo studies and an empirical application for t

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26

Cai, Pengzhan, Xiaojin Lian, Zhixiang Tang, et al. "Effect of heterogeneous laser surface treatment on mechanical properties of interstitial free steel." IOP Conference Series: Materials Science and Engineering 580 (December 9, 2019): 012029. http://dx.doi.org/10.1088/1757-899x/580/1/012029.

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27

Hsieh, Fushing. "The Empirical Process Approach for Semiparametric Two-Sample Models with Heterogeneous Treatment Effect." Journal of the Royal Statistical Society: Series B (Methodological) 57, no. 4 (1995): 735–48. http://dx.doi.org/10.1111/j.2517-6161.1995.tb02059.x.

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28

Avrahami, Matan, Miriam Peskin, Tyler Moore, et al. "Body mass index increase in preschoolers with heterogeneous psychiatric diagnoses treated with risperidone." Journal of Psychopharmacology 35, no. 9 (2021): 1134–40. http://dx.doi.org/10.1177/02698811211008592.

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Objective: Use of risperidone in preschool-aged children is growing, with rising concerns of adverse metabolic consequences. Longitudinal data on risperidone-related weight gain in preschoolers are scarce. We aimed to evaluate changes in body mass index (BMI) that are associated with risperidone treatment in preschoolers. Method: We analyzed naturalistic, longitudinal data on 141 preschool children (112 boys, 29 girls) receiving psychiatric care. Mean patient age at baseline was 5.0 years (SD=0.8) and average follow-up period was 1.3 years (SD=0.8), with >8 mean BMI measurements per patient

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Meszaros, Katalin, та Attila Patocs. "Glucocorticoids Influencing Wnt/β-Catenin Pathway; Multiple Sites, Heterogeneous Effects". Molecules 25, № 7 (2020): 1489. http://dx.doi.org/10.3390/molecules25071489.

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Glucocorticoid hormones are vital; their accurate operation is a necessity at all ages and in all life situations. Glucocorticoids regulate diverse physiological processes and they use many signaling pathways to fulfill their effect. As the operation of these hormones affects many organs, the excess of glucocorticoids is actually detrimental to the whole human body. The endogenous glucocorticoid excess is a relatively rare condition, but a significant proportion of adult people uses glucocorticoid medication for the treatment of chronic illnesses, therefore they are exposed to the side effects

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30

Shen, Guang Xi, Ji Ho Lee, and Kun Sang Lee. "The Effects of Wettability on Gel Performance in Layered Heterogeneous Reservoirs." Applied Mechanics and Materials 448-453 (October 2013): 4028–32. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.4028.

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Regarding the application of enhanced oil recovery (EOR), reservoir heterogeneity leads to early water breakthrough and significant water production, so that substantial cost may be needed to treat the produced water. Gel treatments have been widely used to prevent early water breakthrough and great amount of water production by the modification of permeability. Reservoir wettability gives significant impact on gel treatment. This study is to assess the effect of wettability on the reservoir performance during gel treatment in layered heterogeneous reservoirs. Performances were compared in ter

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31

Stan, Catalina Daniela, Igor Cretescu, Cristina Pastravanu, Ioannis Poulios, and Maria Drăgan. "Treatment of Pesticides in Wastewater by Heterogeneous and Homogeneous Photocatalysis." International Journal of Photoenergy 2012 (2012): 1–6. http://dx.doi.org/10.1155/2012/194823.

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The effect of different heterogeneous and homogeneous photocatalytic systems on the oxidative degradation of mepiquat chloride in aqueous solutions was investigated. In the case of heterogeneous reactions, the influence of five factors was studied: the type of catalyst, photocatalyst concentration, pH, pesticide concentration, and the presence of H2O2and/or Fe3+. For homogeneous catalysis, other factors were studied: the oxidising agent and the light source. Nearly complete degradation of mepiquat chloride was obtained after about 180 minutes in the presence of an acid medium (pH3) using a UV-

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Kumar, Vijyendra, Titikshya Mohapatra, Sandeep Dharmadhikari, and Prabir Ghosh. "A Review Paper on Heterogeneous Fenton Catalyst: Types of Preparation, Modification Techniques, Factors Affecting the Synthesis, Characterization, and Application in the Wastewater Treatment." Bulletin of Chemical Reaction Engineering & Catalysis 15, no. 1 (2019): 1–34. http://dx.doi.org/10.9767/bcrec.15.1.4374.1-34.

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This comprehensive review focuses on the different factors, modification in the synthesis method, characterization and application of heterogeneous catalyst in the wastewater treatment based on the Fenton process. The present review highlights the different catalyst preparation methods like wet impregnation method, hydrothermal method, sol-gel method, precipitation method and their application to treat different recalcitrant organic chemicals. Major heterogeneous catalyst synthesis methods were discussed with their excellent workability. The importance of modification through physical and chem

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33

Sevillano, D., A. B. Capuz Suárez, R. Colmenares Fernández, et al. "PO-0871: Study of the effect of heterogeneous setup random errors in treatment margins." Radiotherapy and Oncology 123 (May 2017): S474—S475. http://dx.doi.org/10.1016/s0167-8140(17)31308-7.

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34

Fathi, Alimi, Tlili Mohamed, Gabrielli Claude, Georges Maurin, and Ben Amor Mohamed. "Effect of a magnetic water treatment on homogeneous and heterogeneous precipitation of calcium carbonate." Water Research 40, no. 10 (2006): 1941–50. http://dx.doi.org/10.1016/j.watres.2006.03.013.

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35

Prifti, Ervin, Silvio Daidone, Noemi Pace, and Benjamin Davis. "Heterogeneous impacts of cash transfers on farm profitability. Evidence from a randomised study in Lesotho." European Review of Agricultural Economics 47, no. 4 (2020): 1531–58. http://dx.doi.org/10.1093/erae/jbz050.

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Abstract We estimate the average treatment effect (ATE) of cash transfers on farm profitability by exploiting a randomised control trial for the evaluation Lesotho’s biggest transfer program. We also explore impact heterogeneity by unpacking the ATE into group-specific parameters. We estimate conditional average treatment effects to describe how treatment effects vary with selected covariates and quantile treatment effects to illustrate the variability of effects at different outcome levels. We find that the program had sizable impacts on farm profitability, but these impacts are spread uneven

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Kishchik, Anna, Anastasia V. Mikhaylovskaya, Anton D. Kotov, and Vladimir K. Portnoy. "Effect of Homogenization Treatment on Superplastic Properties of Aluminum Based Alloy with Minor Zr and Sc Additions." Defect and Diffusion Forum 385 (July 2018): 84–90. http://dx.doi.org/10.4028/www.scientific.net/ddf.385.84.

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Effect of one-step and two-step homogenization treatment on precipitation of Al3(Sc,Zr) dispersoids, grain structure after annealing of cold rolled sheets and superplastic behaviour of a novel Al-Mg based alloy were studied. Heterogeneous nucleation of Al3(Sc,Zr) phase on dislocations and subboundaries dominated at one-step annealing and both homogeneous and heterogeneous nucleation of Al3(Sc,Zr) were observed at two-step annealing modes. It was shown that two-step treatment mode provides high density of Al3(Sc,Zr) precipitates and 650 % of elongation at the constant strain rate of 10-2 s-1 in

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37

Schuss, Eric, and Mohammed Azaouagh. "Combining parenthood and work: transmission channels and heterogeneous returns to early public childcare." Review of Economics of the Household 19, no. 3 (2021): 641–76. http://dx.doi.org/10.1007/s11150-020-09530-x.

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AbstractWe exploit local and temporal variation in the availability of public childcare for children under the age of three that induces exogenous variation in childcare attendance. We find a weak, positive average treatment effect (ATE) on maternal labor supply. The estimation of the average treatment effect is interesting – however, possibly masking important effect heterogeneity. Examining selection behavior and estimating marginal treatment effects along the distribution of observables and unobservables that drive individual treatment decisions reveal transmission channels and uncover subs

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Hung, C. C., Y. H. Huang, and C. Y. Chen. "Heterogeneous catalytic oxidation of hypophosphite by H2O2: pH effect." Water Science and Technology 55, no. 12 (2007): 89–93. http://dx.doi.org/10.2166/wst.2007.387.

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Phosphorus chemicals control key aspects of eutrophication and other environmental process. Hypophosphite (HP) originating from manmade and natural sources was evidenced as present in the environment and was investigated rarely. Recently, iron oxide has been used as a catalyst for oxidising organic contaminants with hydrogen peroxide (i.e. heterogeneous Fenton-like reaction). This study focused mainly on the oxidation of 1.0 mM HP by hydrogen peroxide in the presence of a novel iron oxide catalyst (B1 catalyst) which was prepared through a fluidised-bed Fenton reactor (FBR-Fenton). The backgro

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Gubicza, Jenő, K. Sitarama Raju, Vadlamani Subramanya Sarma, et al. "The Effect of Thermomechanical Treatment on the Microstructure and the Mechanical Behavior of a Supersaturated Cu-Ag Alloy." Materials Science Forum 812 (February 2015): 53–58. http://dx.doi.org/10.4028/www.scientific.net/msf.812.53.

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Supersaturated Cu-3at.% Ag alloy was processed by cold rolling and short-time annealing in order to achieve a combination of high strength and good tensile ductility. After annealing of the rolled samples a heterogeneous solute atom distribution was developed due to the dissolution of nanosized Ag particles in some volumes of the matrix. In regions with higher solute content, the high dislocation density formed due to rolling was stabilized, while in other volumes the dislocation density decreased. The heterogeneous microstructure obtained after annealing exhibited a much higher ductility and

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Macpherson, Rob, and Julian Butler. "Effect of treatment in an active rehabilitation hostel on the need for hospital treatment." Psychiatric Bulletin 23, no. 10 (1999): 594–97. http://dx.doi.org/10.1192/pb.23.10.594.

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Aims and methodTo describe the work of the ‘Vron’, a seven-bed active rehabilitation hostel which has operated in Gloucester for the last 15 years. Such units have been acknowledged as a successful alternative to hospital care for patients with severe mental illness, but nationally are grossly under-provided.ResultsDemographic details, admission and discharge data were described for all 103 patients admitted over a 12–year period up to January 1996. Duration of hospital treatment fell from mean 105.8 days one year before and 138.0 days two years before admission to the Vron to: mean 28.6 days

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Knittel, Christopher R., and Samuel Stolper. "Machine Learning about Treatment Effect Heterogeneity: The Case of Household Energy Use." AEA Papers and Proceedings 111 (May 1, 2021): 440–44. http://dx.doi.org/10.1257/pandp.20211090.

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We use causal forests to evaluate the heterogeneous treatment effects (TEs) of repeated behavioral nudges toward household energy conservation. The average response to treatment is a monthly electricity reduction of 9 kilowatt-hours (kWh), but the full distribution of responses ranges from -40 to +10 kWh. Households learn to reduce more over time, conditional on having responded in year one. Pre-treatment consumption and home value are the most commonly used predictors in the forest. The results suggest the ability to use machine learning techniques for improved targeting and tailoring of trea

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Sihvonen, Sarah K., Kelly A. Murphy, Nancy M. Washton, Muhammad Bilal Altaf, Karl T. Mueller, and Miriam Arak Freedman. "Effect of Acid on Surface Hydroxyl Groups on Kaolinite and Montmorillonite." Zeitschrift für Physikalische Chemie 232, no. 3 (2018): 409–30. http://dx.doi.org/10.1515/zpch-2016-0958.

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AbstractMineral dust aerosol participates in heterogeneous chemistry in the atmosphere. In particular, the hydroxyl groups on the surface of aluminosilicate clay minerals are important for heterogeneous atmospheric processes. These functional groups may be altered by acidic processing during atmospheric transport. In this study, we exposed kaolinite (KGa-1b) and montmorillonite (STx-1b) to aqueous sulfuric acid and then rinsed the soluble reactants and products off in order to explore changes to functional groups on the mineral surface. To quantify the changes due to acid treatment of edge hyd

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Vasil’eva, V. I., N. D. Pismenskaya, E. M. Akberova, and K. A. Nebavskaya. "Effect of thermochemical treatment on the surface morphology and hydrophobicity of heterogeneous ion-exchange membranes." Russian Journal of Physical Chemistry A 88, no. 8 (2014): 1293–99. http://dx.doi.org/10.1134/s0036024414080317.

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Kuperman, V. Y., and L. M. Lubich. "Effect of heterogeneous target dose and radiosensitivity on BED and TCP for different treatment regimens." Physics in Medicine & Biology 66, no. 15 (2021): 155006. http://dx.doi.org/10.1088/1361-6560/abfc8e.

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45

Chiang, Chao-Ching, Philip Nathaniel Immanuel, Yi-Hsiung Chiu, and Song-Jeng Huang. "Heterogeneous Bonding of PMMA and Double-Sided Polished Silicon Wafers through H2O Plasma Treatment for Microfluidic Devices." Coatings 11, no. 5 (2021): 580. http://dx.doi.org/10.3390/coatings11050580.

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In this work we report on a rapid, easy-to-operate, lossless, room temperature heterogeneous H2O plasma treatment process for the bonding of poly(methyl methacrylate) (PMMA) and double-sided polished (DSP) silicon substrates by for utilization in sandwich structured microfluidic devices. The heterogeneous bonding of the sandwich structure produced by the H2O plasma is analyzed, and the effect of heterogeneous bonding of free radicals and high charge electrons (e−) in the formed plasma which causes a passivation phenomenon during the bonding process investigated. The PMMA and silicon surface tr

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Zhang, Min Dong, Yan Fei Wei, and Mei Huang. "Treatment of Dye Wastewater by Nano-Ferrous Modified Bentonite Assisted Advanced Oxidation Processes." Advanced Materials Research 486 (March 2012): 104–7. http://dx.doi.org/10.4028/www.scientific.net/amr.486.104.

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Degradation of dye wastewater was studied by using nanoferrous modified bentonite as the heterogeneous catalyst for a Fenton-like oxidation. By comparing the effect of homogeneous Fenton reactions as well as heterogeneous Fenton-like process for nanomodified bentonite, it is found that the advanced oxidation processes assisted by nanoferrous/bentonite complexes exhibit the stronger degradation capacity. And the removal rate of Fenton-like reaction increased from 23.6% to 75.5% when the ferrous concentration increasing from 20 to 100mmol/L. Being compared with homogeneous Fenton reactions, 20%

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Ivanets, Andrei, and Vladimir Prozorovich. "EFFECT OF MELAMINE ACIDIC TREATMENT ON g-C3N4 PHYSICOCHEMICAL PROPERTIES AND CATALYTIC ACTIVITY." WATER AND WATER PURIFICATION TECHNOLOGIES. SCIENTIFIC AND TECHNICAL NEWS 28, no. 3 (2020): 26–36. http://dx.doi.org/10.20535/wptstn.v28i3.216100.

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Heterogeneous photocatalysts are widely used for wastewater and natural water treatment from organic pollutants. In this paper, g-C3N4-based photocatalysts were synthesized by thermal condensation of melamine. The effect of melamine pretreatment with acetic acid on the physicochemical properties of g-C3N4 was studied using differential thermogravimetric analysis (DTA-TG), X-ray diffraction (XRD), FT-IR spectroscopy, scanning electron microscopy (SEM), and low-temperature nitrogen adsorption-desorption. The catalytic activity of synthesized photocatalysts was evaluated during the oxidative degr

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Rezaei, Fatemeh, and Davide Vione. "Effect of pH on Zero Valent Iron Performance in Heterogeneous Fenton and Fenton-Like Processes: A Review." Molecules 23, no. 12 (2018): 3127. http://dx.doi.org/10.3390/molecules23123127.

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Heterogeneous Fenton processes with solid catalysts have gained much attention for water and wastewater treatment in recent years. In the field of solid catalysts, zero valent iron (ZVI) is among the most applicable due to its stability, activity, pollutant degradation properties and environmental friendliness. The main limitation in the use of ZVI in heterogeneous Fenton systems is due to its deactivation in neutral and alkaline conditions, and Fenton-like processes have been developed to overcome this difficulty. In this review, the effect of solution pH on the ZVI-Fenton performance is disc

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49

Suri, R. P. S., and A. Kamrajapuram. "Heterogeneous ultrasonic destruction of aqueous organic contaminants." Water Science and Technology 47, no. 9 (2003): 137–42. http://dx.doi.org/10.2166/wst.2003.0511.

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Sonolysis is emerging as an effective advanced technology for destruction of organic pollutants in wastewater. The focus of this study is to investigate the potential of enhancing the sonochemical destruction of aqueous organics. Increasing the contaminant destruction rate will reduce the reaction time, and possibly reduce the cost of treatment. For this purpose, the effect of H2O2 and/or silica in the presence of ultrasound is examined for destruction of 2-chlorophenol (2-CP). The effect of silica dosage (1, 5, 10, and 20 g/L), peroxide dosage (50, 75, and 100 mg/L), and pH (3,7,and 11) is ex

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Psaltou, Savvina, Efthimia Kaprara, Kyriaki Kalaitzidou, Manassis Mitrakas, and Anastasios Zouboulis. "The Effect of Thermal Treatment on the Physicochemical Properties of Minerals Applied to Heterogeneous Catalytic Ozonation." Sustainability 12, no. 24 (2020): 10503. http://dx.doi.org/10.3390/su122410503.

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In order to enhance the efficiency of heterogeneous catalytic ozonation, the effect of thermal treatment on three commonly used and inexpensive minerals, i.e., zeolite, talc and kaolin (clay), which present different physicochemical properties as potential catalysts, has been examined for the removal of para-chlorobenzoic acid (p-CBA). p-CBA is considered a typical micro-pollutant, usually serving as an indicator (model compound) to evaluate the production of hydroxyl radicals in ozonation systems. The catalytic activity of selected solid catalysts was studied for different pH values (6, 7 and

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