scholarly journals Experimental flow characterization in a spiral vortex drop shaft

2019 ◽  
Vol 80 (2) ◽  
pp. 274-281
Author(s):  
João Fernandes ◽  
Ricardo Jónatas
Keyword(s):  
Energy Dissipation ◽  
Vertical Shaft ◽  
Model Design ◽  
Inlet Channel ◽  
Drop Shaft ◽  
Flow Characterization ◽  
Spiral Vortex ◽  
Different Types ◽  
Main Components ◽  
Water Depths

Abstract Connecting storm-sewers located at rather different elevations may be made with vortex drop shafts in which the energy dissipation is made by the friction between the vertical shaft and the flow and downstream by the impinging jet in a dissipation chamber. Following the first model design in the 1940s, different types of vortex drop shafts have been developed. One of the most used type is the so-called spiral vortex drop shaft developed to work in supercritical flow with good performance in both energy dissipation and space constrains. In this paper, an experimental flow characterization in a spiral vortex drop shaft is conducted covering the three main components of these structures, namely the inlet channel, the vertical shaft and the dissipation chamber. The results include measurement of water depths, pressure and velocity.

Comparison of diffused layer prepared using liquid dopant solutions and pastes for solar cell with screen printed electrodes

2016 ◽  
Vol 33 (3) ◽  
pp. 167-171 ◽  
Author(s):  
Kazimierz Drabczyk ◽  
Edyta Wróbel ◽  
Grazyna Kulesza-Matlak ◽  
Wojciech Filipowski ◽  
Krzysztof Waczynski ◽  
...  
Keyword(s):  
Solar Cells ◽  
Ethyl Alcohol ◽  
Diffusion Processes ◽  
Phosphorus Oxychloride ◽  
Low Cost ◽  
Content Type ◽  
Base Solution ◽  
Different Types ◽  
Main Components ◽  
Two Stages

Purpose The purpose of this study is comparison of the diffusion processes performed using the commercial available dopant paste made by Filmtronics and the original prepared liquid dopant solution. To decrease prices of industrially produced silicon-based solar cells, the new low-cost production processes are necessary. The main components of most popular silicon solar cells are with diffused emitter layer, passivation, anti-reflective layers and metal electrodes. This type of cells is prepared usually using phosphorus oxychloride diffusion source and metal pastes for screen printing. The diffusion process in diffusion furnace with quartz tube is slow, complicated and requires expensive equipment. The alternative for this technology is very fast in-line processing using the belt furnaces as an equipment. This approach requires different dopant sources. Design/methodology/approach In this work, the diffusion processes were made for two different types of dopant sources. The first one was the commercial available dopant paste from Filmtronics and the second one was the original prepared liquid dopant solution. The investigation was focused on dopant sources fabrication and diffusion processes. The doping solution was made in two stages. In the first stage, a base solution (without dopants) was made: dropwise deionized (DI) water and ethyl alcohol were added to a solution consisting of tetraethoxysilane (TEOS) and 99.8 per cent ethyl alcohol. Next, to the base solution, orthophosphoric acid dissolved in ethyl alcohol was added. Findings Diffused emitter layers with sheet resistance around 60 Ω/sq were produced on solar grade monocrystalline silicon wafers using two types of dopant sources. Originality/value In this work, the diffusion processes were made for two different types of dopant sources. The first one was the commercial available dopant paste from Filmtronics and the second one was the original prepared liquid dopant solution.

scholarly journals Medicinal Uses of Honey

2020 ◽  
pp. 8-12
Author(s):  
Mariia Nikolaevna Sarkisova ◽  
Natalia Viktorovna Biriukova
Keyword(s):  
Comparative Analysis ◽  
History Of Medicine ◽  
National Standards ◽  
Research Papers ◽  
Medicinal Uses ◽  
Stage Of Development ◽  
Different Types ◽  
History Of ◽  
Main Components ◽  
Current Stage

This article describes ways of using various types of honey in the history of medicine as well as its current stage of development. The authors consider the main components of different types of honey and the national standards of naturally sourced honey. An analysis of research papers on medical uses of honey has been performed, as well as a comparative analysis of recent honey-based medicines available in the pharmaceutical market. On the basis of collected data, some possible prospects for further use of honey in medicine have been outlined.

scholarly journals Galvanic Corrosion Behaviour of Phosphate Nodular Cast Iron in Different Types of Residual Waters and Couplings

2019 ◽  
Vol 70 (10) ◽  
pp. 3597-3602 ◽  
Author(s):  
Carmen Nejneru ◽  
Manuela Cristina Perju ◽  
Dumitru Doru Burduhos Nergis ◽  
Andrei Victor Sandu ◽  
Costica Bejinariu
Keyword(s):  
Cast Iron ◽  
Corrosion Behaviour ◽  
Galvanic Corrosion ◽  
Nodular Cast Iron ◽  
Low Alloy Steel ◽  
High Chemical ◽  
Different Types ◽  
Grey Cast ◽  
Main Components ◽  
Galvanic Corrosion Behaviour

The aim of this paper is to analyze the corrosion process that occurs in galvanic couplings of different alloys. The study focuses on materials that can come into contact in submersible pumps used by water treatment plants. Because, the rotor, one of the pump main components must possess high chemical and mechanical properties, nodular cast iron is usually used. Therefore, this is exposed in the same environment with different types of materials, such as aluminum, copper, bronze, grey cast iron, low alloy steel or stainless steel from which other components are made. The tests have been performed in three types of residual waters with neutral, acidic and basic pH. According to this study, the nodular cast iron galvanic corrosion resistance is highly improved by the phosphate layer deposited on its surface.

scholarly journals The Determinants Of Primary Employment In U.S. States

2021 ◽  
Vol 5 (3) ◽  
Author(s):  
Halil Dincer Kaya
Keyword(s):  
Small Business ◽  
Technology Use ◽  
Health And Safety ◽  
Business Owners ◽  
The Internet ◽  
Safety Regulations ◽  
Zoning Regulations ◽  
Different Types ◽  
Main Components ◽  
And Training

We examine the relationship between `primary employment` and `business friendliness` of U.S. states. Do states with a low score in `business friendliness` worry small business owners too much and hence force them to run their business as their primary job? We look at several main components of `business friendliness` including `Ease of start`, `Ease of hire`, `Overall regulations`, and `Training and networking`. We also look at subcomponents including the different types of regulations and technology use. How does each of these factors affect a business owner’s decision to focus mainly on his/her business? We use the `United States Small Business Friendliness Survey` done by Kauffman Foundation and Thumptack.com in 2013 and converted the letter scores ranging from A+ to F in the survey to numerical scores ranging from 12 to 1 (i.e. 1 being the lowest score which corresponds to F). Therefore, after the conversion, each state has a numerical score on each business-friendliness category. The survey also asks business owners if they use the internet when starting a business, when paying their taxes, or when licensing. For each state, we compute the percentage of owners in each state using the internet when starting a business, when paying their taxes, or when licensing. We call these three percentage numbers for each state their `Internetstart`, `Internettax`, and `Internetlicensing` scores. Then, using the mean score for all states for each type of regulation or internet score, we divide the states into two groups: the `high-score states` and the `low-score states`. In our analysis, we use non-parametric tests to compare the `high-score states` to the `low-score states`. Our non-parametric tests show that although none of the main components (i.e. `Ease of start`, `Ease of hire`, `Overall regulations`, and `Training and networking`) seem to affect `primary employment`, the overall business friendliness score of a state significantly affects `primary employment`. When we examine the different types of regulations, we find that `Health and safety regulations`, `Licensing regulations`, and `Zoning regulations` affect `primary employment`. `Employment regulations`, `Tax code`, or `Environmental regulations` does not have a significant impact. These findings may indicate that business owners are more worried with regard to Health and safety regulations, Licensing regulations, and Zoning regulations, therefore more of them choose to take matters into their own hands. Another possible explanation may be the relative complexity of the tasks associated with these regulations. Finally, our results show that technology use in the entrepreneurial process does not affect `Primary employment`.

scholarly journals Ecología y evolución de la polinización por engaño

2017 ◽  
pp. 57
Author(s):  
Reyna A. Castillo ◽  
Carlos Cordero ◽  
César A. Domínguez
Keyword(s):  
Theoretical Framework ◽  
Evolutionary Perspective ◽  
Frequency Dependent ◽  
Selective Pressures ◽  
Deceit Pollination ◽  
Different Types ◽  
Main Components

In this work we reviewed the biology of deceit pollination from an ecological and evolutionary perspective. Species pollinated by deceit are characterized because a percentage of their flowers do not produce rewards, and therefore these species get the advantages derived from pollinators without paying the costs. In this review, we first described the different types of deceit occurring in nature, as well as the selective pressures involved on its evolution. We then reviewed and discussed the theoretical framework of deceit pollination and the relevant aspects of its main components: frequency-dependent se lection, flower resemblance, and the sensorial capacities of pollinators.

Review of the Discussion Section of Research Articles: Rhetorical Structure and Move

2021 ◽  
Vol 8 (2) ◽  
pp. 9-25
Author(s):  
Yasir Bdaiwi Al-Shujairi
Keyword(s):  
Writing Process ◽  
Applied Linguistics ◽  
Research Articles ◽  
Discussion Section ◽  
Rhetorical Structure ◽  
Research Article ◽  
Scientific Disciplines ◽  
Different Types ◽  
Main Components

      The discussion section forms an integral part in the writing process of a research article (RA). Research authors find it difficult to write and produce a well-structured discussion for their findings. The reason could be due to the unawareness of the main components (rhetorical moves) that shape this section. Therefore, this paper aims to provide a review of the studies that have been done to analyze the discussion section of RAs over the last 36 years. Also, this review seeks to examine the discussion section of RAs across various scientific disciplines and different types of journals. The review showed that the rhetorical structure of RAs discussion section witnessed some changes over the course of time. New moves such as Research Implications and Research Limitations started to be parts of the discussion section of RAs. In addition, it was revealed that differences in writing the discussion section can be varied broadly across disciplines such as soft sciences (e.g., applied linguistics, sociology, psychology) and hard sciences (e.g., engineering, chemistry, biology) and slightly across types of journals such as ISI and local journals. In conclusion, this paper offered several suggestions for further research to be conducted in the area.  

Peculiarities of coping with stress among youngsters with various accentuation types

2021 ◽  
pp. 19-26
Author(s):  
Tatiana Razuvaeva ◽  
◽  
Maria Chuykova ◽  
A Lemzyakova ◽  
◽  
...  
Keyword(s):  
Young People ◽  
The State ◽  
Coping With Stress ◽  
Different Types ◽  
Main Components

The article is devoted to the study of the peculiarities of the experience of loneliness in young people with different types of accentuations. In this paper, the experience of loneliness is considered not only through the main components of this phenomenon (isolation, alienation, need for company, etc.), but also from the angle of the principle of casuality or the reasons why a person feels lonely. According to the data obtained as a result of our research, the need for psychocorrective work aimed at overcoming the feeling of loneliness and mastering the skills of coping with the state of loneliness in young people was justified.

Detection and Conditioning of EMG

2018 ◽  
pp. 961-1000
Author(s):  
İmran Göker
Keyword(s):  
Electrical Activity ◽  
Clinical Studies ◽  
Skeletal Muscles ◽  
Clinical Importance ◽  
Analog To Digital Converter ◽  
Digital Converter ◽  
Analog To Digital ◽  
Emg Signal ◽  
Different Types ◽  
Main Components

In this chapter, the monitoring of the electrical activity of skeletal muscles is depicted. The main components of the detection and conditioning of the EMG signals is explained in the sense of the biomedical instrumentation. But, first, a brief description of EMG generation is introduced. The hardware components of the general instrumentation system used in the acquisition of EMG signal such as amplifier, filters, analog-to-digital converter are discussed in detail. Subsequently, different types of electrodes used in different EMG techniques are mentioned. Then, various EMG signals that can be detected and monitored via EMG systems are described and their clinical importance is discussed with detail. Finally, different EMG techniques used in clinical studies and their purposes are explained with detail.

Use of a stacked drop manhole for energy dissipation: a case study in Edmonton, Alberta

2009 ◽  
Vol 36 (6) ◽  
pp. 1037-1050 ◽  
Author(s):  
G. Adriana Camino ◽  
David Z. Zhu ◽  
Nallamuthu Rajaratnam ◽  
Manas Shome
Keyword(s):  
Energy Dissipation ◽  
Total Energy ◽  
Laboratory Investigation ◽  
Flow Regimes ◽  
Flow Patterns ◽  
The Other ◽  
Inflow Conditions ◽  
Water Depths ◽  
Total Energy Dissipation

This paper reports on a laboratory investigation into the performance of a novel stacked drop manhole design where two identical rectangular manholes are stacked one beside the other but at different heights so that there is a drop in elevation from one to the other. The focus of the study was to estimate the energy dissipation that occurs in such stacked manholes during diverse inflow conditions. Flow regimes inside the structure were identified and the effectiveness of the design was assessed under variable inflow conditions. Total energy dissipation in the stacked manhole was found to range from about 50% to 90%, and the contribution of each manhole chamber to the overall energy dissipation was assessed. A relationship between water depths in the manhole chambers and the corresponding outflow conditions was established. In addition, an analysis of the flow patterns and flow regimes highlighted the relevant parameters involved in the mechanisms of energy dissipation.

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