scholarly journals Chromium VI and Fluoride Competitive Adsorption on Different Soils and By-Products

Processes ◽  
2019 ◽  
Vol 7 (10) ◽  
pp. 748
Author(s):  
Ana Quintáns-Fondo ◽  
Gustavo Ferreira-Coelho ◽  
Manuel Arias-Estévez ◽  
Juan Carlos Nóvoa-Muñoz ◽  
David Fernández-Calviño ◽  
...  
Keyword(s):  
Pine Bark ◽  
Competitive System ◽  
Chromium Vi ◽  
Batch Type ◽  
System A ◽  
The Individual ◽  
Polluted Waters ◽  
By Products ◽  
Different Soils ◽  
Oak Ash

Chromium (as Cr(VI)) and fluoride (F−) are frequently found in effluents from different industrial activities. In cases where these effluents reach soil, it can play an important role in retaining those pollutants. Similarly, different byproducts could act as bio-adsorbents to directly treat polluted waters or to enhance the purging potential of soil. In this work, we used batch-type experiments to study competitive Cr(VI) and F− adsorption in two different soils and several kinds of byproducts. Both soils, as well as mussel shell, oak ash, and hemp waste showed higher adsorption for F−, while pyritic material, pine bark, and sawdust had a higher affinity for Cr(VI). Considering the binary competitive system, a clear competition between both elements in anionic form is shown, with decreases in adsorption of up to 90% for Cr(VI), and of up to 30% for F−. Adsorption results showed better fitting to Freundlich’s than to Langmuir’s model. None of the individual soils or byproducts were able to adsorbing high percentages of both pollutants simultaneously, but it could be highly improved by adding pine bark to increase Cr(VI) adsorption in soils, thus drastically reducing the risks of pollution and deleterious effects on the environment and on public health.

scholarly journals Adsorption of Tetracycline and Sulfadiazine onto Three Different Bioadsorbents in Binary Competitive Systems

Processes ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 28
Author(s):  
Raquel Cela-Dablanca ◽  
Manuel Conde-Cid ◽  
Gustavo Ferreira-Coelho ◽  
Manuel Arias-Estévez ◽  
David Fernández-Calviño ◽  
...  
Keyword(s):  
Binary Systems ◽  
Pine Bark ◽  
Mussel Shell ◽  
Entire Concentration Range ◽  
Competitive Systems ◽  
Batch Type ◽  
Manure Slurry ◽  
Adsorption Desorption ◽  
Oak Ash ◽  
Environmental Compartments

Different antibiotics contained in manure, slurry, wastewater or sewage sludge are spread into the environment. The harmful effects of these antibiotics could be minimized by means of immobilization onto bioadsorbent materials. This work investigates the competitive adsorption/desorption of tetracycline (TC) and sulfadiazine (SDZ) onto pine bark, oak ash and mussel shell. The study was carried out using batch-type experiments in binary systems (with both antibiotics present simultaneously), adding 5 equal concentrations of the antibiotics (between 1 and 50 µmol L−1). The adsorption percentages were higher for TC (close to 100% onto pine bark and oak ash, and between 40 and 85% onto mussel shell) than for SDZ (75–100% onto pine bark, and generally less than 10% on oak ash and mussel shell). Pine bark performed as the best adsorbent since TC adsorption remained close to 100% throughout the entire concentration range tested, while it was between 75 and 100% for SDZ. Desorption was always higher for SDZ than for TC. The results of this study could be useful to design practices to protected environmental compartments receiving discharges that simultaneously contain the two antibiotics here evaluated, and therefore could be relevant in terms of protection of the environment and public health.

scholarly journals Modeling of Tractor Fuel Consumption

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2300
Author(s):  
Bronisław Andrzej Kolator
Keyword(s):  
Fuel Consumption ◽  
Soil Conditions ◽  
Simulation Studies ◽  
Working Capacity ◽  
Operational Parameters ◽  
System A ◽  
The Individual ◽  
Adjustment System ◽  
Unit Performance ◽  
Efficiency Indicators

In this paper, the energy diagnostic of tractor performance consists in evaluating the energy (fuel consumption per hectare—dm3 ha−1) for a given agricultural operation and in combining it with working capacity, also called productivity (area productivity—ha h−1). One of the methods of solving this problem is the identification of the functioning process of the machine unit. A model of the process of the machine unit performance was developed, considering the operation of the rear linkage system of the implement with the force control adjustment system. In order to analyze the system, a mathematical model of the system function was built: tractor-implement-soil, defining the physical connections and interdependencies between the individual subsystems of the system. Based on this model, a simulation model was developed and implemented in the Matlab/Simulink environment. The Simulink package was used to test the performance of the machine set. The efficiency indicators according to the adopted criteria were calculated in the evaluation block. To evaluate the process, the technical and operational parameters of the tractor, the type and parameters of the tool, and soil properties were taken into account. The results of simulation studies obtained on a validated model are consistent with experimental data from appropriate soil conditions.

scholarly journals Conceptualizing Competences in E-Services Adoption and Assimilation in SMEs

2010 ◽  
pp. 225-238
Author(s):  
Ada Scupola
Keyword(s):  
Medium Size ◽  
Web Based ◽  
Management Level ◽  
Individual Level ◽  
System A ◽  
Conceptual Skills ◽  
Reservation System ◽  
The Individual ◽  
And Control ◽  
Business To Business

This article investigates the competences deemed necessary both at top managerial and individual levels for the successful adoption and assimilation of business-to-business e-services in small and medium size enterprises. To this end, an in-depth case study of a business-to-business e-service system, a Web-based travel reservation system, was conducted. The results show that three main competences, namely vision, value and control, are important at top management level for the primary adoption of e-services. For secondary adoption and assimilation, three categories of competences were identified as being important either to have or to develop at the individual level, namely technical, interpersonal and conceptual skills.

Individual Factors Affecting the Participation of Turkish People in the New Individual Pension System

2021 ◽  
pp. 98-110
Author(s):  
Emine Ebru Aksoy
Keyword(s):  
Pension System ◽  
Survey Study ◽  
Individual Factors ◽  
Limited Participation ◽  
Factors Affecting ◽  
System A ◽  
Opt Out ◽  
Turkish People ◽  
And Gender ◽  
The Individual

In Turkey, the first step of the individual pension system was based on volunteerism, but the voluntary system resulted in limited participation. Thus, the second step of the system has started to be implemented mandatorily since 2017, and participants were allowed to opt-out the system within two months. More than half of participants in the system preferred to leave the system. Therefore, this study aims to examine individual factors affecting their decision of staying in this system. A survey study was conducted with 374 people selected using the random sampling method. As a result of the study, a positive relationship was found only between the dependent variable and gender, but a significant relationship was determined only between the dependent variable and education level. Based on the results of this study, it is suggested that if the system will need to be improved, the low-performing fund management of the new individual pension system should be re-audited, and the confidence in the system should be increased in this way.

Nature, Nurture, and ’Ndividuality

2021 ◽  
pp. 329-350
Author(s):  
Jack Bauer
Keyword(s):  
Free Will ◽  
Personal Growth ◽  
Causal Role ◽  
Individual Person ◽  
System A ◽  
Whole Person ◽  
Nature And Nurture ◽  
The Individual ◽  
Self Organizing

The field of psychology is under a spell of believing that the person is merely a product of nature and nurture. This belief holds that the individual person plays no causal role in their own development. This belief assumes that epiphenomena (like persons, which originate from nature and nurture) lack real agency and cannot be a cause of themselves at a later time, so personal growth and the transformative self are illusions. This chapter explains the faulty logic in such beliefs and presents the nature, nurture, and ‘ndividuality model of personhood, which holds that the individuality of the whole person influences that person’s own development in ways not explained by nature, nurture, or their interaction. This model relies not on notions of free will or even intentionality but rather on another model of the person as a self-organizing system—a dynamic, organismic system within a pluralistic ecology of systems.

scholarly journals The Role of Adrenoceptors in the Retina

Cells ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 2594
Author(s):  
Yue Ruan ◽  
Tobias Böhmer ◽  
Subao Jiang ◽  
Adrian Gericke
Keyword(s):  
Visual Information ◽  
Vision Loss ◽  
Retinal Diseases ◽  
System A ◽  
The Central Nervous System ◽  
The Individual ◽  
And Function ◽  
The Brain

The retina is a part of the central nervous system, a thin multilayer with neuronal lamination, responsible for detecting, preprocessing, and sending visual information to the brain. Many retinal diseases are characterized by hemodynamic perturbations and neurodegeneration leading to vision loss and reduced quality of life. Since catecholamines and respective bindings sites have been characterized in the retina, we systematically reviewed the literature with regard to retinal expression, distribution and function of alpha1 (α1)-, alpha2 (α2)-, and beta (β)-adrenoceptors (ARs). Moreover, we discuss the role of the individual adrenoceptors as targets for the treatment of retinal diseases.

Health hazards in the paleontology laboratory

1989 ◽  
Vol 4 ◽  
pp. 30-36
Author(s):  
Katherine M. Thomas
Keyword(s):  
Ionizing Radiation ◽  
Direct Contact ◽  
Medical Literature ◽  
Safety Information ◽  
Health Hazards ◽  
Industrial Wastes ◽  
Toxic Chemicals ◽  
The Common ◽  
The Individual ◽  
By Products

Recent medical literature has pointed out the health hazards associated with industrial wastes and by-products; however, little emphasis has been placed on the dangers inherent in scientific laboratories. These hazards range from direct contact with toxic chemicals and vapors to exposure to ionizing radiation. The damage may be acute or chronic; the effects temporary or residual. What follows is a summary of the common hazards, the basic management of laboratory trauma, and guidelines to prevent injury. The individual preceding chapters also contain safety information relative to the specific lab techniques discussed.

Control of trichloroethylene plume migration using a biobarrier system: a field-scale study

2014 ◽  
Vol 69 (10) ◽  
pp. 2074-2078 ◽  
Author(s):  
Y. C. Kuo ◽  
S. Y. Wang ◽  
Y. M. Chang ◽  
S. H. Chen ◽  
C. M. Kao
Keyword(s):  
Field Scale ◽  
Injection Wells ◽  
Plume Migration ◽  
System A ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential ◽  
Groundwater Samples ◽  
Tce Degradation ◽  
Carbon Concentrations ◽  
By Products

The objective of this field-scale study was to evaluate the effectiveness of controlling trichloroethylene (TCE) plume migration using the polycolloid substrate (PS) biobarrier. The developed PS (containing soybean oil, lactate and surfactants) could release substrate to enhance the TCE dechlorination. In this study, a biobarrier comprising PS injection wells was installed. Injection wells were installed at 5-m intervals, and approximately 15 L of PS was injected into each well. Results show that TCE concentrations in the injection wells dropped from an average of 87 μg/L to below 1 μg/L after 35 days of PS injection. The total organic carbon concentrations in the injection wells increased from an average of 2.1–543 mg/L after 30 days of PS injection. The dissolved oxygen (DO) concentrations and oxidation-reduction potential (ORP) values dropped from an average of 1.6 mg/L to below 0.1 mg/L and from 124 mv to −14 mv after 20 days of injection, respectively. The DO and ORP remained in anaerobic conditions during the remaining 100 days of the operational period. TCE degradation by-products were observed in groundwater samples during the operational period. This reveals that the addition of PS could effectively enhance the reductive dechlorinating of TCE.

scholarly journals Permanence and Global Stability of Positive Periodic Solutions of a Discrete Competitive System

2009 ◽  
Vol 2009 ◽  
pp. 1-13 ◽  
Author(s):  
Wenjie Qin ◽  
Zhijun Liu ◽  
Yiping Chen
Keyword(s):  
Global Stability ◽  
Numerical Simulations ◽  
Periodic Solutions ◽  
Positive Periodic Solutions ◽  
Competitive System ◽  
Dynamic Behaviors ◽  
System A ◽  
Analytical Results

We consider the dynamic behaviors of a discrete competitive system. A good understanding of the permanence, existence, and global stability of positive periodic solutions is gained. Numerical simulations are also presented to substantiate the analytical results.

Enhancing Safety in Manufacturing Systems by Integrating Diagnostic Information

2008 ◽  
Author(s):  
Kyle Schroeder ◽  
Aftab A. Khan ◽  
James Moyne ◽  
Dawn Tilbury
Keyword(s):  
Manufacturing Systems ◽  
Diagnostic System ◽  
Process Variable ◽  
Safety System ◽  
Industrial Control ◽  
Industrial Control Systems ◽  
System A ◽  
The Individual ◽  
Diagnostics System

Integrating traditionally separate industrial control systems can derive factory-wide benefits by leveraging more information about the ongoing process. This paper shows that connecting a networked safety system and a process control system leads to an extension of the individual benefits provided by each system. A safety system gains the ability to protect not only the machines and workers but also the product that is being built. A diagnostic system can also raise safety alarms when a process variable is outside the expected range of safe operation. This connection is explored to determine the practical impact of different methods of integration on machining and system processes. Three integration methods are possible depending on which portions of the system can be classified as “safe”. A case study integrating a diagnostics system as a non-safe sensor proves that this connection, when it is implemented on an industrial testbed, provides all of the benefits described and does not require significant changes to control software.

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