Harmonic emission before and after changing to LED and CFL — Part II: Field measurements for a hotel

2010 ◽  
Author(s):  
Sarah K. Ronnberg ◽  
Mats Wahlberg ◽  
Math H.J. Bollen
Keyword(s):  
Field Measurements ◽  
Harmonic Emission ◽  
Before And After

scholarly journals FIELD MEASUREMENTS ON RUNWAY FRICTION DECAY RELATED TO RUBBER DEPOSITS

Transport ◽  
2016 ◽  
Vol 31 (2) ◽  
pp. 177-182 ◽  
Author(s):  
Mario De Luca ◽  
Francesco Abbondati ◽  
Thomas J. Yager ◽  
Gianluca Dell’Acqua
Keyword(s):  
Functional Capacity ◽  
Field Measurements ◽  
Surface Characteristics ◽  
Air Traffic ◽  
Pavement Surface ◽  
Vulcanized Rubber ◽  
Before And After

Surfaces of airport pavements are subject to contamination that can be very dangerous for the movement of aircraft particularly on the runway. A recurrent problem is represented by the deposits of vulcanized rubber of aircraft tires in the touchdown area during landings and lesser during take-offs. This causes a loss of grip that compromises the safety of aircraft movements in take-off and landing operations. This study deals with the surface characteristics decay phenomenon related to contamination from rubber deposits. The experiment was conducted by correlating the pavement surface characteristics, as detected by Grip Tester, to air traffic before and after de-rubberizing operation and two models were constructed for the assessment of functional capacity of the runway before and after the operations de-rubberizing.

scholarly journals Experimental and field verifications of radial gates as flow measurement structures

2021 ◽  
Author(s):  
Hossein Khalili Shayan ◽  
Javad Farhoudi ◽  
Alireza Vatankhah
Keyword(s):  
Field Measurements ◽  
The United States ◽  
Data Series ◽  
Flow Conditions ◽  
Flow Limit ◽  
Before And After ◽  
Energy And Momentum ◽  
Extensive Experimental Data ◽  
Radial Gate ◽  
Discharge Curves

Abstract Radial gates are common structures in irrigation projects. This paper presents some theoretical-based equations for explicit estimation of the discharge from the radial gate under free and submerged flow conditions using Energy and Momentum (E-M) principles. The proposed equations were calibrated using extensive experimental data collected from the literature and this study for three types of radial gates under free and submerged flow conditions. The submergence threshold of radial gates is concluded, based on the concepts of hydraulic jump and the intersection of free and submerged head-discharge curves. The results indicated that the error in estimating the discharge increases under transition ( − 2.5 ≤ Sr% ≤ + 2.5), gate lip (1 < y0/w ≤ 2), and high submerged (yt/y0 ≥ 0.95) flow conditions. However, in these flow limit conditions, the discharge error can be considerably decreased by adjusting the tailwater depth to flow depth just after the gate and using the energy equation for the sections before and after the gate. The efficiency of the proposed methods was evaluated based on the data series from field measurements of radial gates in 29 check structures at irrigation canals in the United States and Iran. The results showed that the discharge could be estimated using the proposed equations in field conditions with acceptable accuracy.

scholarly journals Sebaran Limbah Residu CPO (Crude Palm Oil) Bawah Permukaan Tanah Pada PT. SSDP Dengan Aplikasi Geolistrik

2014 ◽  
Vol 1 (2) ◽  
pp. 109
Author(s):  
Dodi Irwan Siregar ◽  
Thamrin Thamrin ◽  
Muhammad Edisar
Keyword(s):  
Palm Oil ◽  
Soil Nutrient ◽  
Field Measurements ◽  
Oil Industry ◽  
Nutrient Content ◽  
Soil Resistivity ◽  
Before And After ◽  
Nutrient Changes ◽  
Bray 1 ◽  
Properties Of Soil

One of the environmental problems caused by the increasing growth of the industry.Industrial waste generated that goes into the soil can alter soil properties. This studyreviewing the nature of the soil as a result of the distribution of residual waste CPO (CrudePalm Oil) industry mills. This study uses the characteristics of resistivity and soil nutrientproperties. Soil resistivity properties were tested by making a model before and after thedistribution of waste residue does CPO. Then validated against field measurements, fieldmeasurements comparing the data with the model. To see the changes in nutrient content ofsoil Laboratory Testing properties of soil nutrient changes. The results showed that theresistivity properties change and nutrient content of the soil before and after the distributionof waste residue subjected CPO. Soil resistivity values that have mixed by CPO residualwaste is higher than the value of soil resistivity is not mixed waste palm oil residues, while thecontent of soil nutrients among other properties, increasing soil pH, Include content C-Organic (%) / Inceneration, P-Available (ppm) / Bray-1, N-Total (%) / Kjedahl decreaseddramatically. 

scholarly journals A numerical geotechnical model for computing soil slides at banks of water reservoirs

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Nils Reidar B. Olsen ◽  
Stefan Haun
Keyword(s):  
Numerical Model ◽  
Water Level ◽  
Stokes Equations ◽  
Limit Equilibrium ◽  
Three Dimensional ◽  
Field Measurements ◽  
Navier Stokes ◽  
Adaptive Grids ◽  
Groundwater Levels ◽  
Before And After

AbstractSoil slides can occur when the water level in a lake or a reservoir is lowered. This may take place in situations when a reservoir is flushed to remove sediments. The current study describes a three-dimensional numerical model used for the simulation of reservoir flushing that includes the slide movements. The geotechnical failure algorithms start with modelling the groundwater levels at the banks of the reservoir. A limit equilibrium approach is further used to find the location of the slides. The actual movement of the sediments is computed by assuming the soil to be a viscous liquid and by solving the Navier–Stokes equations. The resulting bed elevation changes from the slides are computed in adaptive grids that change as a function of water level, bed erosion and slide movements. The numerical model is tested on the Bodendorf reservoir in Austria, where field measurements are available of the bank elevations before and after a flushing operation. The results from the numerical simulations are compared with these observations. A parameter test shows that the results are very sensitive to the cohesion and less sensitive to the E and G modules of the soil.

The Effects of Hydrogen Dilution on VOC in a-Si:H Pin Solar Cells

1997 ◽  
Vol 467 ◽  
Author(s):  
Qi Wang ◽  
Richard S. Crandall ◽  
Daxing Han
Keyword(s):  
Solar Cells ◽  
Electric Field ◽  
Field Measurements ◽  
Internal Field ◽  
Open Circuit ◽  
Internal Electric Field ◽  
Hydrogen Dilution ◽  
Before And After ◽  
Rf Glow Discharge ◽  
Sun Light

ABSTRACTWe study the effects of hydrogen dilution on the open circuit voltage of a-Si:H pin solar cells fabricated by rf glow discharge growth. We keep the p and n layers the same and only vary the i layer properties. A normal a-Si:H i layer, an H-diluted i layer, and a thin H-diluted layer inserted between p and normal i layer are selected for this study. We measure the JV characteristics and the internal electric field distribution using a transient-null-current technique both in annealed and light soaked states. We find that hydrogen dilution does stabilize the Voc either in a bulk H-diluted i layer or in a thin layer between p and normal i layer after 100 hours AMI sun light soaking. From dark IV measurement, both H-diluted cells show little change in current at voltage near Voc before and after light soaking; while the normal a-Si:H cell does show a noticeable change. Also the internal field measurements find a stronger electric field starting from p and i interface for both H-diluted cells compared to the normal a-Si:H cell. Furthermore, there are no measurable changes in the field profiles after 100 hour AMI light-soaking for both H-diluted and normal a-Si cells. All these suggest that hydrogen dilution increases the field strength near p and i interface, which is the key that leads to a more stable Voc of H-diluted cells.

Effects of Removing Diaphragms from Steel Girder Bridge

1996 ◽  
Vol 1541 (1) ◽  
pp. 183-188 ◽  
Author(s):  
J. M. Stallings ◽  
T. E. Cousins ◽  
T. E. Stafford
Keyword(s):  
Fatigue Cracking ◽  
Field Measurements ◽  
Steel Bridges ◽  
Bottom Flange ◽  
Rolled Steel ◽  
Steel Girder ◽  
Cyclic Stresses ◽  
Before And After ◽  
Steel Girder Bridge ◽  
Girder Bridge

Many multigirder steel bridges built before the 1980s are experiencing distortion-induced fatigue cracking at diaphragm-girder connections. A means of eliminating the cyclic stresses that cause those fatigue problems is to remove the interior diaphragms (diaphragms not at the girder supports). The effects of removing all interior channel diaphragms from an existing simple-span bridge with rolled-steel girders were evaluated based on field measurements of girder stresses and deflections made before and after the diaphragms were taken out. Results from tests with trucks of known weight indicate that removing the diaphragms resulted in increases between 6 and 15 percent in the maximum bottom flange stresses experienced by the most heavily loaded girder. Results for loading by trucks of unknown weight in normal traffic indicate that the most heavily loaded girder may carry up to 17 percent more load as a result of removing the diaphragms.

scholarly journals Static form-finding of normal and defective catenaries based on the analytical exact solution of the tensile Euler–Bernoulli beam

2018 ◽  
Vol 233 (7) ◽  
pp. 691-700 ◽  
Author(s):  
Farzad Vesali ◽  
Mohammad Ali Rezvani ◽  
Habibolah Molatefi ◽  
Markus Hecht
Keyword(s):  
Exact Solution ◽  
Equilibrium Configuration ◽  
Field Measurements ◽  
Steady State Solution ◽  
Contact Wire ◽  
Proposed Model ◽  
Before And After ◽  
Novel Method ◽  
Static Form ◽  
Euler Bernoulli Beam

The aim of this research is to propose and develop an analytical exact solution for finding the static equilibrium configuration of a catenary before and after incurring defects such as tension loss or a broken dropper. The procedure includes considering the steady-state solution of the dynamic motion equation of the contact wire and the messenger cable. The wire and the cable are considered as tensile Euler–Bernoulli beams. The stiffness matrix of the beam is configured and is used to calculate the dropper's dead load. Progressively, a novel method is proposed to find the equilibrium configuration of the same catenary after the defect. The results prove that the tension loss in the messenger cable is more precarious than the tension loss in the contact wire. The broken dropper causes a significant sag in the sub-span and increases the static forces of the adjacent droppers. A comparison with field measurements justifies the accuracy of the results of the proposed model.

Adaptations on Physical Performance Characteristics after a 6-Month Specific Training in Rhythmic Gymnasts

2007 ◽  
Vol 22 (1) ◽  
pp. 10-17
Author(s):  
Helen Douda ◽  
Alexandra Avloniti ◽  
Athanasios Kasabalis ◽  
Savvas P Tokmakidis
Keyword(s):  
Training Program ◽  
Physical Performance ◽  
Field Measurements ◽  
Performance Characteristics ◽  
Analysis Of Covariance ◽  
Control Group ◽  
Technical Performance ◽  
Before And After ◽  
The Right ◽  
Rhythmic Gymnasts

This study examined the specific effects of a 6-month training program on the physical performance characteristics of rhythmic gymnastics (RG) athletes. Seventy-one female rhythmic gymnasts and 81 non-gymnasts (total, 152) were divided into four age categories: 8–10 yrs, 11–12 yrs, 13–14 yrs, and 15–17 yrs. Field measurements of speed, muscular strength, jumping ability, explosive power, and flexibility were made before and after a 6-month training program. The analysis of covariance, using as covariate the initial values, indicated that RG athletes attained the best scores in speed (p < 0.001), jumping ability (p < 0.001), and sit-ups (p < 0.001) and were more flexible than the control group in the sit-and-reach test (p < 0.01) and shoulder flexibility measurements (p < 0.001). In addition, gymnasts showed significant progress and obtained the highest scores in the majority of the tests as compared to the control group after 6 months of training. When measuring hip flexibility and leg lifts forward and sideward, gymnasts had better values on the right leg than the left leg. This observation shows the partial use of the right leg as the prevalent working leg as compared to the left leg which is considered the “support” leg during the performance of different exercises. These results reveal the physical performance characteristics of RG gymnasts as well as the specific adaptations attained in strength and flexibility after 6 months of training. Coaches and athletes should be aware of these findings in order to develop and maintain physical abilities sufficient for a successful technical performance in RG.

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