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A nanosilica adsorbent was prepared and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and BET.

The optimum conditions for the highest adsorption performance were determined by kinetic modeling. The adsorbent was used for the adsorption of acetaminophen (ACT), and the parameters affecting the adsorption were discussed like pH, initial concentration, contact time and adsorbent dosage. The adsorbent have been characterized by SEM, XRD and BET analysis. The kinetic models including pseudo-first-order and pseudo-second-order with Langmuir and Freundlich isotherm models were applied to investigate the kinetic and isotherms parameters.

The adsorption of ACT increased to around 95% with the increase of nanosilica concentration to 30 g/L. Moreover, the adsorption process of ACT follows the pseudo-second-order kinetics and the Langmuir isotherm with the maximum adsorption capacity of 609 mg/g.

This study provided a simple and effective way to prepare of nanoadsorbents. This way was conductive to protect environmental and subsequent application for removal of emerging pollutants from aqueous solutions.

The novelty of the study is synthesizing the morphological and structural properties of nanosilica-based adsorbent (specific surface area, pore volume and size, shape and capability) and improving its removal rate through optimizing the synthesis method; and studying the capability of synthesis of nanosilica-based adsorbent for removal of ACT as a main emerging pharmaceutical water contaminant.

This paper aims to introduce a numerical investigation of aquatic locomotion using the smoothed particle hydrodynamics (SPH) method.

To model this problem, a simple improved SPH algorithm is presented that can handle complex geometries using updatable dummy particles. The computational code is validated by solving the flow over a two-dimensional cylinder and comparing its drag coefficient for two different Reynolds numbers with those in the literature.

Additionally, the drag coefficient and vortices created behind the aquatic swimmer are quantitatively and qualitatively compared with available credential data. Afterward, the flow over an aquatic swimmer is simulated for a wide range of Reynolds and Strouhal numbers, as well as for the amplitude envelope. Moreover, comprehensive discussions on drag coefficient and vorticity patterns behind the aquatic are made.

It is found that by increasing both Reynolds and Strouhal numbers separately, the anguilliform motion approaches the self-propulsion condition; however, the vortices show different pattern with these increments.

This study, a theory-based interventional study, aims to promote self-care behaviors regarding sexual and reproductive health in adolescents (female) in Karaj, Iran.

This study was conducted on 90 female students of the Alborz University of Medical Sciences in Iran. For selecting subjects, the researchers went to two girls' dormitories on working days and tried to observe the proportion of students with different fields. Initially, 200 eligible female students were identified in the dormitories of Alborz University of Medical Sciences. Based on the sample size estimation, 100 research units were divided into two groups of receiving counseling (intervention group) and not receiving counseling (control group) by four-digit block randomization. Sexual and reproductive health self-care questionnaire was used as a tool for data collection before, after and one month after intervention. Data were analyzed by using X² and ANOVA tests using SPSS (16).

Both groups were homogeneous in terms of demographic characteristics before the intervention. The results of the study indicated that after education, sexual and reproductive knowledge (p < 0.001), self-care of sexual health (p < 0.001), self-care of menstrual and genital health (p < 0.001) increased significantly. But, regarding parents' communications (p = 0.11), conversation barriers with parents (p = 0.83), interaction with (p = 0.79) and the perceptions of sexual risk behaviors relationships (p = 0.61) differences are not significant.

Failure of parents to participate in this study and the implementation of this study only on the female sex were main limitations of the present study.

Theory-based education can improve sexual and reproductive health in adolescents' girls.

All Authors declare the manuscript entitled “Sexual and reproductive health self-care: a theory-based intervention” is original work of the author. All data, tables, figures, etc. used in the manuscript are prepared originally by authors; otherwise, the sources are cited and reprint permission is attached.

In the context of promoting sustainable development in SMEs, the present study aims to investigate the relationship among solution dimensions based on the Industry 4.0 (I4.0) concept.

The study employs a comprehensive methodology that includes a systematic literature review, workshop, grounded theory and interpretive structural modeling. Various dimensions concerning I4.0 sustainability are tested and evaluated using a questionnaire design followed by hypothesis formulation. Further, grounded theory is used to extract the key solution dimensions that capture the essence of I4.0 implementation in SMEs. Finally, the solution dimensions for I4.0 sustainability are modeled using the ISM approach to understand the structural interdependencies among them, and Matrice d'Impacts Croisés Multiplication Applied to a Classification (MICMAC) analysis is done to understand the driving and dependence power among these dimensions.

The study identified 14 solution dimensions for the implementation of I4.0 in SMEs for sustainable development. Out of the 14 solution dimensions, human resource training programs (D4) appear at level 11, followed by top management commitment (D1), strategic collaborations (D3) and coordination among key stakeholders (D5) at level 2 in the hierarchical interpretive structural modeling (ISM) model. Also, these dimensions have an effect size of more than 0.50 which indicates a substantial correlation between the sustainability dimensions and Industry 4.0 implementation in SMEs.

The study contributes to the overall goal of fostering sustainability within the SME sector, which can pave the way for various stakeholders for the successful implementation of I4.0 sustainable solution dimensions.