scholarly journals Elevated tanks effect on transient pressures: case study

2021 ◽  
Author(s):  
Moustafa S. Darweesh
Keyword(s):  
Considerable Effect ◽  
Water Hammer ◽  
Supply Networks ◽  
Actual Distribution ◽  
Pumping Stations ◽  
Elevated Tanks ◽  
Present Case Study ◽  
The Impact ◽  
Supply Systems

Abstract Elevated tanks are an integral part of the water supply networks. This paper highlights the effect of elevated tanks' location and size on the transient pressures resulting from the sudden failure of pumps. A comparison between the impact of elevated tanks and air vessels on the water hammer was also performed. The Bentley HAMMER model was first validated then applied to analyze the unsteady flow within an actual distribution network. The results display that the elevated tanks have a considerable effect on the surge pressures, where they improve the extreme pressures effectively at and around them, but they cannot fully protect the system from the water hammer risks, as there are still relatively large negative pressures at some distant junctions. Besides, as the tank capacity increases, the surge pressures increase slightly. In our case study, the best location of the elevated tank is at the network extremity and then at the pumping stations, since the minimum pressures improve by 67 and 54%, respectively. Although the present case study may differ from other supply systems, the obtained results can provide an indication of the elevated tanks' role in alleviating undesirable water hammer effects.

The impact of the primary canine premature extraction on the sagittal, vertical and transversal dimensions of the bone tissue

2021 ◽  
Vol 21 (1) ◽  
pp. 47-50
Author(s):  
Ad. A. Mamedov ◽  
T. V. Timoshenko ◽  
T. S. Gutnikova
Keyword(s):  
Bone Loss ◽  
Three Dimensional ◽  
Volume Measurement ◽  
Growth Spurt ◽  
Special Technique ◽  
Suggested Technique ◽  
Present Case Study ◽  
The Impact ◽  
Primary Canine

Relevance. The article studies the primary canine premature extraction as the cause of three-dimensional (sagittal, transversal, vertical) bone underdevelopment in the area of the extracted tooth. The research is relevant as there are insufficient data in the scientific literature on this topic and the prevalence of premature primary canine extraction for therapeutic and orthodontic indications is high.Materials and methods. The present case study developed a special technique for bone volume measurement in all planes by CBCT.Results. Several CBCTs of one patient over the period of three years were analyzed according to the suggested technique. The calculations demonstrated significant sagittal and vertical bone loss.Conclusions. The results of the research allowed us to conclude that premature extraction of the primary canines leads to the significant sagittal and vertical bone loss. Besides, no increase in the intercanine distance was detected despite the patient’s growth spurt.

PSO Applied to Reduce the Cost of Energy in Water Supply Networks

2013 ◽  
Vol 409-410 ◽  
pp. 703-706 ◽  
Author(s):  
Bruno Melo Brentan ◽  
Edevar Luvizotto Jr. ◽  
Lubienska Cristina L.J. Ribeiro
Keyword(s):  
Water Supply ◽  
Extended Period ◽  
Water Supply Systems ◽  
Operational Parameters ◽  
Supply Networks ◽  
Water Pumping ◽  
Cost Of Energy ◽  
Pumping Stations ◽  
The Cost ◽  
Supply Systems

The growth of urban population and subsequent expansion of the cities impose difficulties of gather a reliable water supply systems that attend the fluctuations of demand throughout the day, and their operation with appropriate hydraulic and operational parameters. The search of better routines for water pumping stations with both starting and stopping of pumps or use of variable speed devices has become increasingly common, and the motivation of this search is found in the need for energy saving. But the task is arduous and becomes fertile field for the application of modern techniques and robust optimization. Noteworthy are currently those that seek their inspiration in nature systems, such as Particle Swarm Optimization, which is based on intelligence of groups, such as schools of fish or swarms of bee. By this way, the present work aims to contribute to the topic, developing a hybrid algorithm (simulator-optimizer) for determination of optimized routines for pumping station i.e., routines that seek the best operational routine for an extended period of 24 hours.

scholarly journals Aripiprazole Improves Depressive Symptoms and Immunological Response to Antiretroviral Therapy in an HIV-Infected Subject with Resistant Depression

2010 ◽  
Vol 2010 ◽  
pp. 1-4 ◽  
Author(s):  
Chiara Cecchelli ◽  
Giacomo Grassi ◽  
Stefano Pallanti
Keyword(s):  
Viral Load ◽  
Antiretroviral Therapy ◽  
Immunological Response ◽  
Cd4 Count ◽  
Hiv Positive ◽  
Psychotropic Agents ◽  
Resistant Depression ◽  
Present Case Study ◽  
The Impact

Aripiprazole is the first medication approved by the FDA as an add-on treatment for MDD. The impact of aripiprazole on the response to HIV is unknown. The patient we report on was diagnosed HIV-positive in 1997 and has been treated with antiretroviral therapy since then. In 2008, we diagnosed resistant major depression, hypochondria, and panic disorder. On that occasion, blood tests showed a significantly reduced CD4 count and a positive viral load. We treated this patient with aripiprazole and citalopram. Mood, somatic symptoms, and occupational functioning progressively improved. The last blood examination showed an increase in the CD4 count and a negative viral load. On the basis of the present case study and the review of the literature concerning the effects of psychotropic agents on viral replication, we suggest that the use of aripiprazole in HIV-infected subjects warrants further research.

scholarly journals THE IMPACT OF UNIVERSAL PRIMARY ENROLLMENT ON CLASSROOM PRACTICES IN THE PUBLIC SECTOR SCHOOLS OF PUNJAB: A MULTI CASE STUDY ANALYSIS

2021 ◽  
Vol 3 (2) ◽  
Author(s):  
Umer Ameem , Zahida Mansoor, Ali Raza
Keyword(s):  
Public Sector ◽  
Student Performance ◽  
Quantitative Research ◽  
Classroom Practices ◽  
Sampling Technique ◽  
Considerable Effect ◽  
Positive Trend ◽  
The Public ◽  
The Impact

The study explores the effect of Universal Primary Enrollment (UPE) initiative on the classroom practices in the public sector schools in Punjab. Access to primary education is an identified goal for a number of developing countries where determined efforts for achieving the targets for school going children are nearing fruition. Although the UPE drive in the public sector schools shows a positive trend towards the achievement of enrollment targets, however the increased enrollment has also affected the standard of education in public sector schools. The study used a multi case study approach by means of a quantitative research design. Three different schools from three different districts were selected as sample using purposive sampling technique purposively from the public sector schools of Punjab. Classroom observations were conducted for the understanding of increased enrollment impact on teachers’ practices in class. Each case was observed for a week; each observation checklist category was observed on separate week days. The finding of the study reveal that the increase in student enrollments had a considerable effect on teachers’ performance as the bigger class sizes, created problems in managing the class; score student work, and provide responses on student performance. The substantial increase in the workload puts teachers under pressure and makes it challenging to efficiently manage a positive learning environment.  

Optimal Expansion and Reconstruction of Heat Supply Systems

2013 ◽  
Vol 2 (4) ◽  
pp. 59-79 ◽  
Author(s):  
V. A. Stennikov ◽  
T. B. Oshchepkova ◽  
N. V. Stennikov
Keyword(s):  
Heat Supply ◽  
Optimal Allocation ◽  
Heat Supply System ◽  
Real Problem ◽  
Supply Networks ◽  
System A ◽  
Pumping Stations ◽  
Heat Supply Systems ◽  
Integrated Technique ◽  
Supply Systems

The paper addresses the issue of optimal expansion and reconstruction of heat supply systems, which includes a set of general and relatively specific problems. Therefore, a comprehensive approach to their solving is required to obtain a technically admissible and economically sound result. Solving the problem suggests search for effective directions in expansion of a system in terms of optimal allocation of new heat sources, their type, output, operating area; construction of new heat networks, their schemes and parameters; optimal detection of “bottlenecks” in the system and ways of their elimination (expansion, dismantling, replacement, strengthening of heat pipeline sections, construction of pumping stations and other components of heat supply networks). The authors present a mathematical statement of the problem, its decomposition into separate subproblems and an integrated technique to solve it. Consideration is given to a real problem solved for a real heat supply system. A set of arising problems is presented. The application of developed methodological and computational tools is shown.

Analysis of Full-Featured Pump Curve to Study the Impact of Large Diameter, Long Distance and High-Lift Water Pipeline

2011 ◽  
Vol 90-93 ◽  
pp. 2954-2959
Author(s):  
Yu Si Yang ◽  
Li Liu ◽  
Kun Li
Keyword(s):  
Water Supply ◽  
Large Diameter ◽  
Water Hammer ◽  
Urban Water Supply ◽  
Long Distance ◽  
High Lift ◽  
Pumping Stations ◽  
Water Pipelines ◽  
Water Pipeline ◽  
The Impact

According to the situation of Chinese urban water supply, this article has analyszed the possibility and computing method for water hammer that caused by pump stop in large diameter and high-lift water pipelines. In addition the impact of Full-featured Pump Curve on the water hammer calculation are also discussed. Finally, using the water hammer calculation of the primary pumping stations within a water-supply project which located in northeast China as an example, we had made corresponding conclusion.

Impacto de afluências indevidas no consumo energético em instalações elevatórias em sistemas de drenagem urbana

2020 ◽  
pp. 29-40
Author(s):  
Catarina Jorge ◽  
◽  
Maria do Céu Almeida ◽  
Dídia Covas
Keyword(s):  
Sensitivity Analysis ◽  
Energy Management ◽  
Energy Use ◽  
Real Life ◽  
Pumping Stations ◽  
Relevant Variables ◽  
Wastewater Systems ◽  
Separate System ◽  
The Impact

As afluências indevidas são identificadas como um dos principais problemas dos sistemas de águas residuais e pluviais, levando a diversos problemas de desempenho dos mesmos, como sejam a ocorrência de inundações, a diminuição da eficiência hidráulica e energética, entre outros. A atuação no controlo de afluências indevidas perspetiva oportunidades de melhoria do desempenho em várias dimensões incluindo a componente de eficiência energética. Neste artigo desenvolve-se esta temática numa perspetiva de avaliação do desempenho de instalações elevatórias (IE) embora considerando o sistema como um todo. A metodologia adotada consiste em efetuar a análise de sensibilidade de um sistema separativo de águas residuais para cenários de ocorrência de afluências indevidas à rede, de modo a avaliar o impacto no consumo de energia e noutras variáveis relevantes do sistema. O caso de estudo utilizado consiste numa adaptação do caso de estudo real correspondente ao sistema de drenagem de águas residuais da Bacia da Venteira, Amadora. A finalidade é aferir uma abordagem para tratar esta temática de modo mais geral com base no caso de estudo referido, de forma a contribuir para a sensibilização para a adoção de metodologias operacionais e de monitorização que permitam ter dados para fazer uma gestão mais racional da energia nestes sistemas. As conclusões são genericamente aplicáveis a qualquer sistema separativo de águas residuais. Undue inflows are identified as one of the main problems in wastewater and stormwater systems, leading to several performance issues, such as flooding, decreased efficiency in water and energy use, among others. Acting in the control of undue inflows leads to performance enhancements in several dimensions including the energy efficiency component. This paper presents developments regarding performance evaluation of pumping stations, although considering the system as a whole. The proposed methodology consists of adopting a sensitivity analysis for a separate wastewater system, considering scenarios of undue inflows occurrences in the network, in order to evaluate the impact on energy consumption and other relevant variables of the system. The case study presented herein is adapted from a real life case study corresponding to the Venteira's domestic separate system (located at Amadora, Portugal). The main purpose is to assess an approach to address this issue, in order to contribute to increase awareness for the adoption of operational and monitoring methodologies to contribute for a more rational energy management in these systems. The conclusions are generally applicable to separate wastewater systems.

Store Openings and Sourcing Strategies in the Internationalization of Fashion Industrial Retailers

2016 ◽  
pp. 374-397 ◽  
Author(s):  
Simone Guercini ◽  
Matilde Milanesi
Keyword(s):  
Competitive Advantage ◽  
Empirical Investigation ◽  
Distribution Functions ◽  
Manufacturing Companies ◽  
International Expansion ◽  
Supply Networks ◽  
Sourcing Strategies ◽  
Traditional Manufacturing ◽  
The Impact

In the fashion sector, the distribution functions and management of the processes involved in the network of stores have acquired a central role. This points to the potential rise of retailing competences, also among traditional manufacturing companies, as a factor of competitive advantage. The chapter outlines the characteristics of the “industrial retailer,” namely a retailer that integrates industrial capabilities, whose role is relevant in the configuration of supply networks, being operators that act globally with market and resource seeking strategies. The chapter sheds light on the phenomenon of stores openings, by providing an empirical investigation in two steps: the first has the aim of describing the extent and scope of the phenomenon; the second includes a case study of an Italian fashion firms with typical characteristics of the industrial retailer. The chapter highlights the impact on sourcing strategies and relevance of stores openings for the international expansion of brand-based companies.

What Do We Do with Irregular Correspondences? The Case of the Khoe Languages

1991 ◽  
Vol 18 ◽  
pp. 359-379 ◽  
Author(s):  
Rainer Vossen
Keyword(s):  
Empirical Research ◽  
Basic Principle ◽  
Sound Change ◽  
The World ◽  
Development Of Language ◽  
Phonological Change ◽  
Present Case Study ◽  
The Impact

There is nothing that cannot be related directly or indirectly to anything else, and it is this nightmare that is horrifying. There seems to be no precedent for this sort of chaos in the languages of the world… (Traill 1974:251)Regularity of phonological change is considered a basic principle of historico-linguistic reconstruction. In 1876 A. Leskien of the Leipzig school of neogrammarians formulated the postulate of sound change occurring without exception, meaning “that if one assembled all the facts, and analyzed them accurately and thoroughly, one could state exceptionless principles or laws for the development of language” (Lehmann 1973:87). However, it has since been argued on the basis of empirical research that languages are never in complete balance and that, therefore, change is not necessarily constant, nor parallel among groups speaking different languages. Various reasons have been found to account for irregularities in language: the impact of one language on another, the effect of children acquiring their language, etc. Yet before we enter into any etiological discussion of irregular or unstructured phonological change, the area of investigation for the present case study must be introduced, and the characteristic of the problematic nature of the case sketched.

Changes within the Teaching Pedagogy Driven by Covid-19: Viewpoints and Analysis

2021 ◽  
pp. 182-185
Author(s):  
Getaksha Marwaha
Keyword(s):  
Education Sector ◽  
Digital Learning ◽  
Teaching Pedagogy ◽  
The World ◽  
Present Case Study ◽  
The Impact ◽  
The Way

The Covid-19 pandemic has led to several severe transformations within the numerous sectors of the world economies. It has left no sector unaffected. The impact has been such that the life is currently classified as pre-covid and post covid era. One of the sectors that has been extremely impacted is the education sector. The sector has witnessed some of the unanticipated sea changes all-round the globe. The unexpected changes within the teaching pedagogy driven by Covid-19 have exposed some serious limitations and challenges. It has also conjointly inspired digital learning, providing all the way new experiences to the users. The changes have currently become new realities. The present case study tries to rapidly assess the advantages of the digital learning and the challenges that accompany the dynamics of this teaching pedagogy.

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