scholarly journals Performance Improvement of Pumps Fed by the Variable Speed Drives

2013 ◽  
Vol 4 (1) ◽  
pp. 45-51 ◽  
Author(s):  
Valery Vodovozov ◽  
Ilja Bakman
Keyword(s):  
Performance Improvement ◽  
Test Bench ◽  
Pump Efficiency ◽  
Variable Speed ◽  
Variable Speed Drives ◽  
Drive Control ◽  
Traditional Approaches ◽  
The Impact

Abstract Speed inaccuracy decreases the pump efficiency, reliability, and energy saving. This research is devoted to the determination of the ways of accurate speed control of the pump drives operated under changeable loads. The impact of speed inaccuracy on the pump performance is studied. Based on the analysis of methods for the static accuracy improvement, the drawbacks of the traditional approaches have been shown with reference to the pumping applications. A new methodology of the slip compensation has been proposed for implementation to improve the scalar drive performance. It notably decreases the speed inaccuracy of the open-ended pumping applications. The enhanced quality of the drive control at different loading conditions has been shown on a laboratory test bench. Also, for the multi-pump systems this approach results in an additional benefit from the viewpoint of the operation around the best operation point providing a safe pump control both to exclude the pump damage and to improve the process quality.

scholarly journals Impact of hydromorphological pressures on the macrophytes bioindicators of the ecological water quality in Mediterranean rivers

2019 ◽  
Vol 14 ◽  
pp. 1-14 ◽  
Author(s):  
Maissour Abdellah ◽  
Benamar Saad
Keyword(s):  
Reference Lists ◽  
Biotic Indices ◽  
Indicator Values ◽  
Mediterranean Rivers ◽  
Indicator Taxa ◽  
The Impact ◽  
Indicator Systems ◽  
Macrophyte Index

One of the important tools to evaluate the ecological quality of surface water is the Macrophytes indices based on the bioindication capacity of aquatic plants. In Mediterranean rivers (France, Spain, and Portugal), the development of some macrophytes indices like l’Indice Biologique Macrophytes Rivières (IBMR), the biological metric score (BMS), as well as the Fluvial Macrophyte Index (IMF) are founded on the determination of the indicator values of the floristic reference lists. The aim of this study was to test the impact of the eco-Mediterranean differences (from one country to another) on the indicator taxa by comparing the indicator values of the Euro‐ Mediterranean macrophyte indices. With this in mind, we explore the possibility of the introduction of the Euro‐Mediterranean macrophytes-based indices in Morocco (i.e. the hydrological basin of Sebou (HBS)) as a part of a preliminary attempt to develop the first Afro-Mediterranean macrophyte index. We confirm that the ecological amplitude and species optima vary between Mediterranean ecoregions, and indicator taxa differ between countries: There are medium to small correlations between Mediterranean indices: IBMR/BMS (p = 0.000, R2 = 0.57), IMF/BMS (p = 0.000, R2 = 0.34), and IBMR/IMF (p = 0.000, R2 = 0.30). Five species exhibit major differences in indicator values: Zannichelliapalustris and Potamogetonpectinatus have more eutrophic indicator values in France (IBMR) than in Spain (IMF). Potamogetonnodosus, Amblystegiumriparium and Lycopuseuropaeus have broader ecological amplitudes in Portugal (BMS) than in France (IBMR) and in Spain (IMF), where it is restricted to eutrophic conditions. Furthermore, the three indicator systems include different indicator-taxon numbers. The comparison of the HBS elaborated list with the Euro‐Mediterranean indices revealed the low level of common taxa approximately 6.76% of all indicator species used in the French index (IBMR), 10.48% in the Portuguese index (IMF) and 12.38% in the Spanish index (BMS). These results show the inadequacy of the trophic indices approach with the HBS conditions and thus the need for the development of an index based on biotic indices approach.

scholarly journals Assessment of the Impact of Sewage Storage Ponds on the Water Environment in Surrounding Area

Proceedings ◽  
2020 ◽  
Vol 51 (1) ◽  
pp. 20
Author(s):  
Kairat Ospanov ◽  
Timur Rakhimov ◽  
Menlibai Myrzakhmetov ◽  
Dariusz Andraka
Keyword(s):  
Water Quality ◽  
Water Environment ◽  
Quality Parameters ◽  
Treated Wastewater ◽  
Groundwater Aquifer ◽  
Sewage Ponds ◽  
Basic Quality ◽  
The Impact

The paper presents the results of research on the environmental impact of sewage ponds serving the city of Kostanay (Kazakhstan). The scope of the research included the determination of basic quality parameters of raw and treated wastewater, an analysis of the chemical composition of groundwater in the vicinity of sewage ponds, and the analysis of the water quality of the Tobol River. The obtained results indicate that sewage from storage ponds, infiltrating into the ground, caused groundwater pollution in the area of about 100 km2 around the reservoirs. Due to the fact that the groundwater aquifer in the vicinity of sewage ponds feeds the Tobol River, it also affects water quality in the river, which does not meet the requirements for most of the analyzed parameters.

scholarly journals The Impact of the Quality of Tap Water and the Properties of Installation Materials on the Formation of Biofilms

Water ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1903 ◽  
Author(s):  
Dorota Papciak ◽  
Barbara Tchórzewska-Cieślak ◽  
Andżelika Domoń ◽  
Anna Wojtuś ◽  
Jakub Żywiec ◽  
...  
Keyword(s):  
Tap Water ◽  
Galvanized Steel ◽  
Phosphorus Compounds ◽  
Plate Count ◽  
Nickel Steel ◽  
Quantitative Analyses ◽  
The Impact ◽  
First Time

The article presents changes in the quality of tap water depending on time spent in installation and its impact on the creation of biofilms on various materials (polyethylene (PE), polyvinyl chloride (PVC), chrome-nickel steel and galvanized steel). For the first time, quantitative analyses of biofilm were performed using methods such as: Adenosine 5’-triphosphate (ATP) measurement, flow cytometry, heterotrophic plate count and using fractographical parameters. In the water, after leaving the experimental installation, the increase of turbidity, content of organic compounds, nitrites and nitrates was found, as well as the decrease in the content of chlorine compounds, dissolved oxygen and phosphorus compounds. There was an increase in the number of mesophilic and psychrophilic bacteria. In addition, the presence of Escherichia coli was also found. The analysis of the quantitative determination of microorganisms in a biofilm indicates that galvanized steel is the most susceptible material for the adhesion of microorganisms. These results were also confirmed by the analysis of the biofilm morphology. The roughness profile, the thickness of the biofilm layer can be estimated at about 300 μm on galvanized steel.

scholarly journals Object Recognition for Quadcopter Drone using Convolutional Neural Networks

2020 ◽  
Vol 9 (7) ◽  
pp. 224-227
Keyword(s):  
Neural System ◽  
Neural Systems ◽  
Course Of Action ◽  
Self Sufficiency ◽  
Working Parameters ◽  
The Impact ◽  
Free Dynamic ◽  
Line Observation

Object detection is as of now generally utilized in industry. It is the strategy for location and design of genuine items. Models incorporate intermittent scaffold examinations, debacle the executives, power line observation and traffic examinations. As UAV applications become progressively broad, more significant levels of self-sufficiency and free dynamic procedures are expected to improve the security, proficiency and exactness of the gadgets. This article exhibits in detail the method and parameters important for the preparation of convolutional neural systems (CNN) in the programmed acknowledgment of items. The potential areas of utilization in the vehicle division are additionally featured. The precision and unwavering quality of the CNNs rely upon the arrangement of the system and the determination of working parameters. The impact of article recognition shows that by picking a parameter setting course of action, a CNN can recognize and gather objects with a noteworthy degree of accuracy (97.5%) and computational profitability. Moreover, utilizing a convolutional neural system actualized in the YOLO stage (V3), items can be followed, distinguished and characterized progressively

scholarly journals Comprehensive Analysis of the Quality of Orthodontic Treatment of Transcarpathian Teenagers

2021 ◽  
Vol 6 (1) ◽  
pp. 237-243
Author(s):  
O. V. Klitynska ◽  
◽  
V. Z. Ivaskevych ◽  
N. V. Hasiuk ◽  
◽  
...  
Keyword(s):  
Quality Of Life ◽  
Orthodontic Treatment ◽  
Self Esteem ◽  
Life Questionnaire ◽  
Dental Anomalies ◽  
Study Results ◽  
The Impact ◽  
Psychological Disability

The high prevalence of dental anomalies and deformities requires a careful approach to orthodontic treatment, especially to improve quality of life. The purpose of the study was to determine the effectiveness of orthodontic care by index assessment of the results of correction of dental anomalies and determination of the psychosocial profile in adolescents of the Transcarpathian region. Material and methods. The object of the study were 68 adolescents from the Transcarpathian region. Determination of the correction of dental and maxillary apparatus anomalies was performed by calculating the relevant part of the ICON index, calculating the evaluation of the results. The quality of life of adolescents was assessed using the OHIP-14 quality of life questionnaire. Statistical analysis was performed after consolidation of results using the application package Statistica 10.0 (StatSoft, Inc., USA) and Microsoft Office Excel 2010. Results and discussion. Many studies in the field of psychology have determined that self-esteem is a core characteristic of the individual and together with the level of claims is a regulator of human activity and significantly affects its development. The result of self-esteem depends on how a person evaluates his/her success in joint activities where he/she is a member. This is especially true for teenagers and adolescence. The most important aspect of impaired quality of life in patients of this subgroup were problems of psychological and social nature, issues of external attractiveness, which prevailed even over the physical aspects of the impact, which is quite typical of adolescence. In patients with moderate orthodontic treatment there was a statistically significant improvement on the scales of psychological discomfort (from 6.4±0.6 points to 3.96±0.6 points; p <0.05), psychological disability (from 6.5±0.5 points to 2.18±0.5 points; p <0.05) and social disability (from 5.4±0.5 points to 3.36±0.5 points; p <0.05). Patients in this group after solving problems related to the aesthetics of the smile, as well as discomfort during communication, felt greater psychological comfort, relief in interaction with others and peers. There was a noteworthy shift of accentuation in such patients from problems with appearance to study and active social life. Among patients with severe orthodontic treatment, the most pronounced dynamics was observed on all scales of dental quality of life: on the scale of masticatory dysfunction (from 5.7±1.0 points to 3.12±1.0 points; p <0.05), physical pain (from 7.5±0.7 points to 2.01±0.7 * points; p <0.05), psychological discomfort (from 7.9±0.6 points to 3.48±0.6 points; p <0.05) physical disability (from 7.7±0.5 points to 3.20±0.5 points; p <0.05), psychological disability (from 7.5±0.4 points to 3.41±0.5 points; p <0.05). Conclusion. According to the study results, the success of orthodontic treatment (indicators of severity and effectiveness of orthodontic treatment according to the ISO index) directly correlated with the level of quality of life (r = 0.62; p <0.05)

Improving quality of care and reducing costs with angiogenesis-specific imaging tests in metastatic breast cancer.

2012 ◽  
Vol 30 (34_suppl) ◽  
pp. 150-150
Author(s):  
Carolyn Bodnar ◽  
L. Clark Paramore ◽  
Kevin B. Knopf
Keyword(s):  
Breast Cancer ◽  
Quality Of Care ◽  
Metastatic Breast Cancer ◽  
Accurate Determination ◽  
Metastatic Breast ◽  
Base Case ◽  
Test Results ◽  
The Impact

150 Background: Anti-angiogenesis (AA) drugs (e.g., bevacizumab) are expensive and their clinical benefit in metastatic breast cancer (MBC) has been challenged. Healthcare reform and financial pressures prioritize programs which improve patient quality of care and reduce costs of unnecessary care. Angiogenesis-specific imaging tests (A-IT) under development have potential to offer earlier, accurate determination of response. For A-IT-identified responders, AA treatment would be continued. For patients identified as non-responders, futile AA treatment and associated toxicities can be avoided and alternative therapies initiated. Methods: A decision-tree model was developed to estimate the impact of A-IT from determination of AA therapy eligibility through to disease progression. Key decision nodes were presence/absence of A-IT (assessing change in biomarker expression across 2 PET/CT scans: at AA eligibility, then after one cycle of AA), A-IT sensitivity/specificity (SE/SP) and clinician adherence to test results (tied to belief that results are valid enough to stop AA therapy). Key model inputs (and base case values): 1) median time to progression (TTP) for current MBC patients on AA therapies (9.5 months); 2) median TTP for A-IT identified responders (13 months); 3) costs of bevacizumab, one cycle ($5,200); 4) percentage of AA patients with hemorrhage (4%); 5) costs of hemorrhaging, per event ($14,694); 6) per patient costs for A-IT ($6,000); 7) estimated SE/SP of A-IT – 95%/75%; and 8) clinician adherence to test results (75%). Results: Based on a cohort of 100 MBC patients, use of A-IT results in 29 patients avoiding futile AA therapy with a saving of $460,000, versus a scenario where A-IT was not used. One-way threshold sensitivity analysis shows A-IT is cost-saving if SP >62% or when clinician adherence is ≥63%; results are not sensitive to AA hemorrhage rate. Conclusions: Use of A-IT could improve quality of care by optimizing AA therapy, i.e., by identifying responders who will experience survival benefit and non-responders who can avoid futile therapy and toxicity risks. Significant cost savings may be possible as a result of early determination of response to AA drugs.

A New Proposal for Setting Parameter Values in Restricted Randomization Methods

2007 ◽  
Vol 46 (04) ◽  
pp. 440-449 ◽  
Author(s):  
G. Kundt
Keyword(s):  
New Method ◽  
Restricted Randomization ◽  
Varying Parameters ◽  
Number Of Patients ◽  
Intrinsic Quality ◽  
Parameter Values ◽  
The Impact ◽  
Exact Equality

Summary Objectives: Complete randomization could result in an undesirable imbalance in the number of patients assigned to each treatment, especially in small trials. Therefore, a variety of restricted randomization procedures has been developed. By varying parameters it is possible to appropriately modify the balancing characteristics of these designs. However, there is little information on what are sensible choices for the parameters. Therefore, we suggest a new method for suitable determination of parameter values of restricted randomization rules. Methods: For restriction to be effective, it need not yield exact equality. As the reliability of a test is not very sensitive to slight deviations from equal sample sizes we define that a given maximum tolerable imbalance d can be achieved or exceeded with a given probability p*. By using this condition, parameter values of restricted procedures are determinable. Results: For permuted-block, biased-coin, urn, and big-stick randomization we investigated the impact of parameters on balancing properties. For different extents of restriction and by using the submitted condition, the values of parameters to be chosen are determined. Conclusions: Up to now choice of parameter values has often occurred at random. Now it is possible to determine values of parameters by specifying the tolerable degree of imbalance and the risk to be worse. As a consequence restriction will, as much as possible, not be imposed and not imposed more than necessary in order to preserve the intrinsic quality of randomization.

Influence of anthropogenic activity to the macronutrient loading in water and soil – Case study of industrial area

2020 ◽  
pp. 81-92
Author(s):  
Oana Romina Botoran ◽  
◽  
Mihaela Iordache ◽  
Claudia Sandru ◽  
Marius Miricioiu ◽  
...  
Keyword(s):  
Sustainable Development ◽  
Base Cations ◽  
Industrial Area ◽  
Quality Parameters ◽  
Anthropogenic Activity ◽  
Physico Chemical ◽  
The Impact

Mining activities, in combination with accelerated urbanization growth and climate change, constitutes a major challenge for creating a sustainable development. Thus, the monitoring and assessment of mining effect is mandatory in understanding the impact on the primary physico-chemical characteristics of an environment. In this context, the paper presents the evolution of micro- and macro- nutrients in water, soil and sediment from two industrial areas from Romania (Copșa Mică industrial platform and Baia Sprie mining zone), in order to assess the impact of pollutants on ecosystems. Physico-chemical (pH, NH4+, NO3-, NO2-, TN, TP), base cations (Ca, Mg, Na and K) and micronutrients (Fe, Mn and Zn) have been analyzed in order to evaluate the quality of the environment. For some of the analyzed soils, the concentration of Zn, Mn and Fe exceeded the maximum permissible limits (MPL) imposed by the Romanian legislation, falling within the limit for Alert Thresholds for less sensitive soils. The correlation analysis on water quality parameters revealed that all parameters are more or less correlated with each other Person’s Correlation matrix. Overall, our results demonstrated that the knowledge of the physico-chemical regime of an environment is of great value in the determination of its productivity, usefulness and other characteristics which can facilitate further vegetation restoration and reconstruction and a sustainable development of the ecological environment in a polluted area.

scholarly journals Blood Contamination in CSF and Its Impact on Quantitative Analysis of Alpha-Synuclein

Cells ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 370 ◽  
Author(s):  
Barkovits ◽  
Kruse ◽  
Linden ◽  
Tönges ◽  
Pfeiffer ◽  
...  
Keyword(s):  
Neurological Diseases ◽  
Alpha Synuclein ◽  
Blood Levels ◽  
Contamination Level ◽  
Blood Contamination ◽  
Potential Biomarker ◽  
Key Factor ◽  
The Impact

Analysis of cerebrospinal fluid (CSF) is important for diagnosis of neurological diseases. Especially for neurodegenerative diseases, abnormal protein abundance in CSF is an important biomarker. However, the quality of CSF is a key factor for the analytic outcome. Any external contamination has tremendous impact on the analysis and the reliability of the results. In this study, we evaluated the effect of blood contamination in CSF with respect to protein biomarker identification. We compared three distinct measures: Combur10-Test® strips, a specific hemoglobin ELISA, and bottom-up mass spectrometry (MS)-based proteomics for the determination of the general blood contamination level. In parallel, we studied the impact of blood contamination on the detectability of alpha-synuclein (aSyn), a highly abundant protein in blood/erythrocytes and a potential biomarker for Parkinson’s disease. Comparable results were achieved, with all three approaches enabling detection of blood levels in CSF down to 0.001%. We found higher aSyn levels with increasing blood contamination, highlighting the difficulty of authentic quantification of this protein in CSF. Based on our results, we identified other markers for blood contamination beyond hemoglobin and defined a grading system for blood levels in CSF samples, including a lower limit of tolerable blood contamination for MS-based biomarker studies.

scholarly journals VALIDA project: Validation of allergy in vitro diagnostics assays (Tools and recommendations for the assessment of in vitro tests in the diagnosis of allergy)

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
María L. Casas ◽  
Ángel Esteban ◽  
Miguel González-Muñoz ◽  
Moisés Labrador-Horrillo ◽  
Mariona Pascal ◽  
...  
Keyword(s):  
Immunoglobulin E ◽  
Allergic Patient ◽  
Specific Ige ◽  
In Vitro Tests ◽  
Consensus Document ◽  
Specific Immunoglobulin E ◽  
The Impact

AbstractIn vitro allergen-specific immunoglobulin E (IgE) detection and quantification tests are routinely performed in clinical laboratories to diagnose patients with a suspected allergy. Numerous commercial assays are available to test for allergies, but the results can vary widely, thereby influencing both diagnosis and treatment. Given the challenges posed by differences in the various assays for in vitro determination of specific IgE, a group of experts has compiled in a document a series of recommendations on the implications that the use of a certain in vitro technique may have and the impact on the management of the allergic patient that the differences between the various techniques represent. The reading and analysis of this consensus document will help to understand the implications of the change of in vitro diagnostic method in the management of the patient with allergy, in the quality of life and in the socioeconomic costs associated with the disease.

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