scholarly journals Regression Examination Technique: Correlation between Nozzle Velocity and Vibration Level of Hydro-Turbine in SHP Run-off-River Scheme

2019 ◽  
Vol 8 (6) ◽  
pp. 3404-3413
Keyword(s):  
Water Level ◽  
Flow Rate ◽  
Vibration Level ◽  
Rainfall Distribution ◽  
Run Off ◽  
Statistical Analysis Method ◽  
Measured Flow ◽  
Independent Variable ◽  
One Year ◽  
The Impact

Regression Examination is one of the most popular statistical analysis method used to determine the correlation between examined variables. It can also be used to predict the value of a dependent variable based on the value of at least one independent variable and this will allow explaining the impact of changes in an independent variable on the dependent variable. With the measured data of flow rate, output power and efficiency of turbine system, the nozzle velocity can be calculated using an appropriate mathematical equation. Along with vibration level data at every measurement axes, they are tabulated and imported into MATLAB program for the correlation determination. Three different set of data are used in this analysis which is based on the variation of water level at different month (low, typical and high) due to rainfall distribution within one year period. The objective of this study was to examine two questions: first is the effect of water level to the measured flow rate and generated output as well the calculated nozzle velocity. Second, with these variation of nozzle velocity, how significance their correlation with the vibration level at multiple axes of the turbine and generator? From the results, it has been discovered that there are significant correlation between nozzle velocity and vibration level, particularly during low level of water (lower rainfall distribution)

scholarly journals Analisis Pengaruh Penyekatan Kanal Untuk Untuk Pembahasan Lahan Gambut Tropis

2020 ◽  
Vol 14 (2) ◽  
pp. 129-135
Author(s):  
Gina Khusnul Khotimah ◽  
◽  
Sigit Sutikno ◽  
Indradi Wijatmiko ◽  
◽  
...  
Keyword(s):  
Ground Water ◽  
Water Level ◽  
Good Effect ◽  
Fire Prevention ◽  
Emission Rates ◽  
Groundwater Levels ◽  
Peatland Restoration ◽  
Peatland Rewetting ◽  
One Year ◽  
The Impact

Peatlands rewetting for hydrological restoration plays an important role for fire prevention and peatland restoration of degraded peatland. One of the methods for the rewetting is canal blocking. The impact of canal blocking for peatland rewetting is further analyzed in this research. This study focused in Pulau Tebing Tinggi peatland hydrological unit (PHU), which is located in Kepulauan Meranti Regency, Riau Province. To analysis the rewetting impact, 15 dipwells were installed with the distance of 1 m, 51 m, 101 m, 201 and 301 m from the canal for each transect of the three transects. A transect was set in the downstream and two transects were set in the upstream of canal block. The ground water level (GWL) in the 15 dipwells was recorded using water-loggers for one year. This research found that canal blocking has a good effect on maintaining groundwater levels and keeping peatlands in always wet or humid conditions up to a distance of 201 m perpendicular to the canal if the rise in water level in the canal due to canal blocking is more than 0.6 m. It is able to maintain the ground water depth in peatlands around 0.4 m, where the peatlands become low risk to the fire, emission rates and subsidence.

scholarly journals Impacts of operational conditions on oxygen transfer rate, mixing characteristics and residence time distribution in a pilot scale high rate algal pond

2018 ◽  
Vol 78 (8) ◽  
pp. 1782-1791 ◽  
Author(s):  
L. A. Pham ◽  
J. Laurent ◽  
P. Bois ◽  
A. Wanko
Keyword(s):  
Water Level ◽  
Flow Rate ◽  
Rotational Speed ◽  
Time Distribution ◽  
Transfer Rate ◽  
Pilot Scale ◽  
High Rate ◽  
Operational Conditions ◽  
Inlet Flow Rate ◽  
The Impact

Abstract Different combinations of operational parameters including water level, paddle rotational speed and influent flow rate were applied to investigate their impacts on mixing characteristics, residence time distribution and gas transfer rate in a pilot-scale high rate algal pond. In closed condition, the paddle rotational speed had a positive correlation with the Bodenstein number (Bo), water velocity and oxygen volumetric mass transfer coefficient (kLaO2) while increasing water level generated a negative impact on these parameters, although the impact of water level on water linear velocity was small. The amplification effect of water level and paddle rotational speed on the sensitivity of Bo and kLaO2 should be noticed. Moreover, paddle rotational speed had more impact on kLaO2 than on Bo. The study in open condition indicated that effective volume fraction had a positive correlation with inlet flow rate and negative correlation with paddle rotation, while the opposite was observed in the case of Peclet number. The impact of water level variation on these parameters was unclear. Both water level and paddle rotational speed had negative impacts on the short-circuiting index, while no correlation was observed when varying inlet flow rate. In this study, the optimal operational conditions included low water level (0.1 m) and medium paddle rotational speed (11.6 rpm).

scholarly journals ANALISIS ALIRAN BALIK (BACKWATER) PADA AMBANG GERIGI

2021 ◽  
Vol 14 (2) ◽  
pp. 61
Author(s):  
Winda Harsanti, ST., MT ◽  
Medi Efendi ◽  
Sitti Safiatus Riskijah
Keyword(s):  
Water Level ◽  
Water Flow ◽  
Open Channel ◽  
Channel Model ◽  
Step Method ◽  
Independent Variable ◽  
The Impact

Gerigi weir is a modificated jigsaw weir which can hold water flow to gain higher water level. This water raising happens in upstream of the weir until certain length to reach normal depth. This research uses square open channel model with slope as an independent variable. In this research uses various slope from 1‰ to 5‰ for eight different discharges. The aim of this research is to find the impact of slope for backwater length using Direct Step Method. The result of this research is the longest back water happened in the 8th of experiment discharge (1399,984 cm3/sec) with the slope of 3‰, by 40.800,4952 cm from the weir. In addition, slope is not affect for the length of backwater. This is because from all analysis of experiments, the longest backwater happens in different slope for each discharge, namely between 1‰, 3‰, or 4‰ of slope.                      Keywords: back water, gerigi weir, slope

scholarly journals The Research of the Suitability of Hydrostatic Water Level Sensor to Measure Storm Water Runoff Flow Rate with the Focus on the Influence of Sediments

2017 ◽  
pp. 336-344
Author(s):  
Vilmantė Karlavičienė ◽  
Raimondas Zaborovskis ◽  
Vaidas Vinciūnas ◽  
Mindaugas Rimeika
Keyword(s):  
Water Level ◽  
Flow Rate ◽  
Urban Areas ◽  
Experimental Studies ◽  
Storm Water ◽  
Water Runoff ◽  
Storm Water Runoff ◽  
Accuracy Of Measurements ◽  
Level Sensor ◽  
The Impact

Since most of the contaminants in surface waters fall with storm water runoff, it is very important to correctly describe the content of pollutants discharging with them (kilograms or tons) for a given unit of time (hour, shift, day, month or year). Measurements are complicated by the fact that the flow rate and pollutant concentration is very variable over time. The aim of the research was to determine the grain size of sweepings accumulated on the surfaces of the researched territory and to investigate the impact of storm water runoff sediments on the accuracy of measurements of water level height using the hydrostatic water level sensor. For the experiment four typical Vilnius city streets, two storm water runoff treatment plants and also the streets sweeping machine was chosen. Storm water runoff in urban areas has an abundance of sediment, therefore, studying the hydrostatic water level sensor DI 240 Diver suitability to determine storm water runoff flow rate, for the experimental studies the impact of sludge and sand for measuring accuracy was chosen. Particles with diameters ranging from 0.315 to 0.630 mm consisting the maximum weight (the average value of 24 g per 100 g of the sample) of street sweepings. Storm water runoff treatment plants sediments are approximately 60% of the smallest particles with a size of less than 0.05 mm. Particles of less than 0.25 mm consisting about 80% of sediment. During laboratory and full scale tests it was determined, that there is no significant affect of sediments on the accuracy of the hydrostatic water level sensor measurements. The average square error (standard deviation) was 0.567 cm when the measurement uncertainty was 0.0021 cm.

Impact Of Transurethral Resection Of Prostate On International Prostate Symptom Score And Peak Urinary Flow Rate

2020 ◽  
Vol 16 (1) ◽  
pp. 11-15
Author(s):  
Md Waliul Islam ◽  
Md Abul Hossain ◽  
Md Nurul Hooda ◽  
Kazi Rafiqul Abedin ◽  
Husne Ara
Keyword(s):  
Flow Rate ◽  
Transurethral Resection ◽  
Urine Volume ◽  
T Test ◽  
Urinary Symptoms ◽  
Urinary Flow Rate ◽  
Transurethral Resection Of Prostate ◽  
Urinary Flow ◽  
Paired Student ◽  
The Impact

Objectives: To evaluate urinary symptoms and quality of life in patient with BPH before and after TURP. To determine the impact of TURP on the urinary symptoms (IPSS) and peak urinary flow rate. Methods: This study is prospective study carried out between 2010 and 2011 in the department of Urology, National Institute of Kidney Diseases & Urology. Total 102 cases were selected purposively according to selection criteria. Each patient was observed and followed up at 8 weeks (1st visit), 16 weeks (2nd visit) 24 weeks (3rd visit) after transurethral resection of prostate (TURP). IPSS score, QOL score also recorded and uroflowmetry was done to see the peak urinary flow rate (Qmax) of urine and voiding time. USG was done to see post voidal residual urine volume and DRE also done in selected cases. Data was complied and statistical analysis were done using computer based software, Statistical Package for Social Science (SPSS), using paired ‘t’ test. A P value <0.05 was taken as significance. Results: Before TURP, IPSS range 17-25 and mean 21.61+2.43, after TURP, range 0-7 and mean 4.27+1.71). Hence a significant improvement of IPSS was found from 2 months to 6 months follow up after TURP. The change was tested using “paired student ‘t’ test”. Before TURP Qmax range 7-12.2 and mean was 9.96+1.69, which became range 18-25 and mean was 22.61+2.28 after TURP and therefore change of mean Qmax was 12.64+2.69. The change was tested using “paired student ‘t’ test”. The change was found significant (P<0.001). Conclusion: Transurethral resection of prostate resolves obstructive symptoms, rapid improvement of urinary flow rate Bangladesh Journal of Urology, Vol. 16, No. 1, Jan 2013 p.11-15

تأثير الاستثمار الاجنبي المباشر في القيمة السوقية للشركة (دراسة تطبيقية في شركة بترو جانيا الصينية في عقود التراخيص النفطية للجولة الاولى والثانية في الحقول النفطية في العراق للمدة من 2017-2010)

2020 ◽  
Vol 2020 (66) ◽  
pp. 65-85
Author(s):  
هيثم عبد النبي موسى ◽  
أ .د حيدر نعمة غالي الفريجي
Keyword(s):  
Foreign Direct Investment ◽  
Stock Prices ◽  
Return On Investment ◽  
Direct Investment ◽  
Inverse Correlation ◽  
Market Value ◽  
Political Stability ◽  
Coefficient Of Determination ◽  
Independent Variable ◽  
The Impact

This study dealt with the effect of foreign direct investment on the market value of the company during the period of time (2010-2017). This issue was studied through a sample of oil fields in southern Iraq in which the company operates within the first and second licensing contracts rounds and according to the circumstances and variables of the investment environment as it is. Although this investment often achieves high returns, it is also characterized by a high degree of risk and for the purpose of evaluating the impact of foreign direct investment on the market value of the company's stock prices for the period (2010-2017). The statistical scale (T-TEST) was used to indicate the significance of the correlation hypotheses. Between the return on investment as the independent variable and the market value as the dependent variable, and the use of the coefficient of determination (R2) that measures the effect of the independent variable (foreign direct investment) on the dependent variable (market value) and the F-Test to demonstrate acceptance or rejection of the hypothesis of the return on investing in the market value of the oil company, and if the company achieves a high return in foreign direct investment, the market value of it will be affected positively. The study was based on a set of goals, including determining the attractiveness of Iraq to foreign investments, especially the oil sector, and the study reached a number of conclusions, the most prominent of which is the existence of a strong inverse correlation between the return on investment and the market value of the company. And the existence of a slight impact of the return on investment on the market value of the company, and the study reached a number of recommendations, the most important of which is activating the investment climate through political stability and the clarity and stability of laws and legislation regulating investment, which is one of the most important factors affecting the investment decision.

scholarly journals An Effectiveness Trial of STEADI in an Outpatient, Primary Care Practice

2020 ◽  
Vol 4 (Supplement_1) ◽  
pp. 774-774
Author(s):  
David Rein ◽  
Madeleine Hackney ◽  
Michele Dougherty ◽  
Camille Vaughan ◽  
Laurie Imhof ◽  
...  
Keyword(s):  
Primary Care ◽  
Medication Review ◽  
Primary Care Practice ◽  
Controlled Trial ◽  
Care Practice ◽  
Strength Assessment ◽  
Randomized Controlled ◽  
Study Team ◽  
One Year ◽  
The Impact

Abstract The STEADI Options trial uses a randomized, controlled-trial design to assess the effectiveness and cost-effectiveness of the STEADI Initiative . Beginning March, 2020, we will randomize 3,000 adults ≥ 65 years of age at risk for falls seen in an Emory Clinic primary care practice to: (1) full STEADI; (2) a STEADI-derived gait, balance, and strength assessment with physical therapy referrals; (3) a STEADI-derived medication review and management; or (4) usual care. This presentation will discuss decisions made by the study team to facilitate implementation of STEADI including electronically conducting screening prior to the date of encounter, the use of dedicated nursing staff to conduct assessments, implementation of strength, balance, orthostatic hypotension, and vision testing, methods to facilitate medication review, and communication of assessment information to providers. The results from this study will be used to estimate the impact of STEADI on falls, service utilization, and costs over one year.

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