Numerical Study of Sand Deposition and Control by Flat Solar Panels

2012 ◽  
Author(s):  
Chuanjin Lan ◽  
Zhen Li ◽  
Yanbao Ma
Keyword(s):  
Large Scale ◽  
Numerical Study ◽  
Optimal Choice ◽  
Solar Panels ◽  
Inclination Angles ◽  
Mean Wind Speed ◽  
Entrainment Process ◽  
The Mean ◽  
And Control ◽  
Better Than

To make the best use of solar energy, most solar plants are located in deserts or dry and sandy areas, where most of the sand originate in sandstorms and desertification. For large scale solar plants, the structure of the solar panels can reduce the mean wind speed greatly, thus having a great effect on the deposition and entrainment process of the sand and dust. To study the effect of installment of solar panels on wind flow, numerical simulations are applied to get the turbulent flow field in the lee of the solar panels, with inclination angles ranging from 15° to 30° and at different spacing. The results show that 30° is the optimal choice and the performance with larger spacing at 2.5 times panel length is better than the case at 1.5 times.

scholarly journals The Effect of Using Word Family Game on The Vocabulary Mastery of The Fifth Grade Students at SD Negeri 1 Astina in Academic Years of 2017/2018

2017 ◽  
Vol 1 (3) ◽  
pp. 122
Author(s):  
Ni Komang Amelia Kartadi
Keyword(s):  
Fifth Grade ◽  
Control Group ◽  
Control Group Design ◽  
Fifth Grade Students ◽  
Conventional Teaching ◽  
Post Test ◽  
The Mean ◽  
And Control ◽  
Experimental Group ◽  
Better Than

This study aimed at investigating of the effect of using word family game committed by the fifth grade student in SD Negeri 1 Astina in mastering the English vocabulary. This study was True-Experimental with post-test only control group design. The population was 59 students of the fifth grade and the sample was selected by using cluster random sampling. The sample of this research study was 22 students in 5A as an Experimental Group while 22 students in 5B as a Control Group. The experimental group was taught by using Word Family Game and control group was taught without using Word Family Game. The data was analyzed descriptively and inferentially through SPSS 16.0 Program. Descriptively, the students in experimental group were achieved better than the students in control group. It was proven by the result of the mean score of the experimental group was 90.45, while the mean score of control group was 83.18. The result of the t-test also showed that the score of the (tobs) was 3.393 which the score of (tcv) was 1.682 which based on the degree of freedom was 42. It showed that the (tobs) > (tcv), where: 3.393 > 1.682. It could be concluded that the word family game had a significant effect on the students’ vocabulary mastery rather than using conventional teaching. 

Experimental investigation of aerodynamic vibrations of solar wing system

2018 ◽  
Vol 21 (15) ◽  
pp. 2217-2226 ◽  
Author(s):  
YC Kim ◽  
Y Tamura ◽  
A Yoshida ◽  
T Ito ◽  
W Shan ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Experimental Investigation ◽  
Wind Speed ◽  
Wind Tunnel ◽  
Solar Panels ◽  
Boundary Layer Flows ◽  
Turbulence Flow ◽  
Aeroelastic Model ◽  
Mean Wind Speed ◽  
The Mean

The general characteristics of aerodynamic vibrations of a solar wing system were investigated through wind tunnel tests using an aeroelastic model under four oncoming flows. In total, 12 solar panels were suspended by cables and orientated horizontally. Distances between panels were set constant. Tests showed that the fluctuating displacement increases proportionally to the square of the mean wind speed for all wind directions in boundary-layer flows. Larger fluctuating displacements were found for boundary-layer flows with larger power-law indices. Under low-turbulence flow, the fluctuating displacement increased proportionally to the square of the mean wind speed for wind directions between 0° and 30°, but an instability vibration was observed at high mean wind speed for wind directions larger than 40°. And when the wind direction was larger than 60°, a limited vibration was observed at low mean wind speed and the instability vibration was also observed at high mean wind speed. Fluctuating displacements under grid-generated flow showed a similar trend to that of the boundary-layer flows, although the values became much smaller.

Relative Efficiency of Ancillary and Small Scale Units

1978 ◽  
Vol 3 (4) ◽  
pp. 279-284
Author(s):  
K.R. Shaligram
Keyword(s):  
Small Firms ◽  
Large Scale ◽  
Small Scale ◽  
Underlying Assumption ◽  
Significant Difference ◽  
End Products ◽  
Policy Measures ◽  
The Mean ◽  
Small Manufacturers ◽  
Better Than

Ancillary units are small firms manufacturing and supplying intermediate goods, typically to large firms. Several policy measures are under consideration to raise the output of the ancillary industry to the level of 15 per cent of the value of output of the large scale industry by 1985. The underlying assumption appears to be that the ancillary status enhances the prospect for the viability of the small firm. This paper examines whether ancillary units perform better than small scale units (small manufacturers of end products) under the conditions prevailing in India. The findings reveal no significant difference in the mean performance of the two classes of small firms. It also draws implications for policymakers and management from the findings.

scholarly journals On Efficient Estimation of Process Variability

Symmetry ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 554
Author(s):  
Tanveer Akhlaq ◽  
Muhammad Ismail ◽  
Muhammad Qaiser Shahbaz
Keyword(s):  
Numerical Study ◽  
Empirical Studies ◽  
Efficient Estimation ◽  
Process Variability ◽  
Good Insight ◽  
Exponential Method ◽  
Process Dispersion ◽  
The Mean ◽  
Insight Into ◽  
Better Than

Variability or dispersion plays an important role in any process and provides insight into the spread of data from some central point, usually the mean. A process with less spread is preferred over a process in which values differ greatly from the mean. Various methods are available to estimate the process dispersion by using information on the variable of interest. Certain additional variables provide good insight to estimate the process dispersion. In this paper, we propose an efficient method for the estimation of process variability by using the exponential method. The properties of the proposed method were studied. We conducted simulation and empirical studies to compare the proposed method with some existing methods of estimation of variability. The results of the numerical study show that our proposed method is better than the other methods used in the study.

Satisfaction and performance in patient selected goals after grip reconstruction in tetraplegia

2010 ◽  
Vol 35 (7) ◽  
pp. 563-568 ◽  
Author(s):  
J. Wangdell ◽  
J. Fridén
Keyword(s):  
Upper Extremity ◽  
Daily Life ◽  
Performance Measure ◽  
Occupational Performance ◽  
Canadian Occupational Performance Measure ◽  
Basic Activity ◽  
The Mean ◽  
And Performance ◽  
And Control ◽  
Better Than

Reconstruction of grip in tetraplegia aims to improve upper extremity performance and control in daily life. We evaluated the effects of surgery and rehabilitation on performance and satisfaction of patient identified activity goals in 20 patients (22 arms) who had grip reconstructions for both finger and thumb flexion. Patients assessed an improvement in both performance and satisfaction after surgery in all groups of activities assessed using the Canadian Occupational Performance Measure (COPM). The mean improvement at 6 and 12 months was 3.5 points better than the 2.5 points before surgery. Before surgery 36% of the goals identified were impossible to perform. After surgery, 78% of these goals were possible. The largest improvement was observed in the basic activity of ‘eating’ but significant improvement was also noted in activities generally regarded as complex and not measured in standard ADL such as ‘doing housework’ and taking part in ‘leisure’.

scholarly journals Wie viele Schulen braucht ein fairer Vergleich? Sozialindex-basierte Adjustierungsstrategien im Vergleich

2020 ◽  
Author(s):  
Johannes Schult
Keyword(s):  
Secondary School ◽  
Large Scale ◽  
Comparison Group ◽  
School Management ◽  
Economic Index ◽  
Fair Comparison ◽  
Comparison Groups ◽  
The Mean ◽  
Adjustment Strategies ◽  
Better Than

Large-scale educational competence tests provide teachers and school management with information regarding their students’ performance. For a so-called fair comparison, a school’s mean score can be compared with the mean score of schools with a similar social composition. Similarity is usually determined by a social school index that is based on contextual factors that lie beyond the teachers’ influence. The present study compares two adjustment strategies along with three types of indices with regard to their fairness in terms of explained performance variance (R2). Each combination is modelled with 24 different comparison group sizes in order to find out how many schools are needed for a fair comparison. The analysis is based on two cohorts with 2330 elementary schools and 1261 secondary school, respectively. A socio-cultural index performs better than a socio-economic index based on georeferenced data and also better than a combined socio-cultural/socio-economic index. Using comparison groups based on index quantile splits yields slightly higher R2-values than using schools right above and below the target school on the index. If possible, the number of comparison groups should at least 20 with each group containing at least 20 schools. The results suggest that a reasonably fair comparison can be obtained efficiently while costing little, remaining robust across grades and subjects, and being comprehensible for teachers and school management personal.

scholarly journals Eksperimentasi Teknik Quick On The Draw Pada Pembelajaran Matematika Peserta Didik Kelas VIII SMPN 1 Ranah Batahan Kabupaten Pasaman Barat

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Yulia Yulia
Keyword(s):  
Hypothesis Testing ◽  
Conventional Technique ◽  
Control Group ◽  
Mathematical Concepts ◽  
Quasi Experimental ◽  
Class Viii ◽  
The Mean ◽  
Randomized Control ◽  
And Control ◽  
Better Than

The purpose of this study is to determine the understanding on mathematic concept who were taught by using Quick On The Draw Technique was better than the students who were taught by using conventional technique at Class VIII SMPN 1 Ranah Batahan Kabupaten Pasaman Barat. Quasi experimental that designed randomized control group only design. The population of this research was class VIII students of SMP N 1 Ranah Batahan Kabupaten Pasaman Barat of 4 class. For determine the experimental class and the control class is done by randomly. Classes are chosen as experimental class is a class experiment is VIII.2 class and control class is the class VIII.3.. It can be seen from the mean score of experiment class 70.89,  control class was 57.78. Hypothesis testing by using t-test showed that t-was higher than  (1.97 > 1.68) with degree of freedom 95% so hypothesis is accepted. In conclusion, students’ understanding on mathematic concept who were taught by using Quick On The Draw technique was higher than the students who were taught by using conventional technique at calss VIII of SMPN 1 Ranah Batahan Kabupaten Pasaman Barat. Based on the above description the researcher gives advice to mathematical educator, to make quick on the draw technique as one of alternative to improve understanding of mathematical concepts of learners.Keyword : Quick on the draw technique, Understanding on mathematic concept

scholarly journals Eksperimentasi Teknik Quick On The Draw pada Pembelajaran Matematika Peserta Didik Kelas VIII SMPN 1 Ranah Batahan Kabupaten Pasaman Barat

2019 ◽  
Vol 2 (2) ◽  
Author(s):  
Yulia Yulia ◽  
Asmaiwaty Arief ◽  
Apria Nora
Keyword(s):  
Conventional Technique ◽  
Control Group ◽  
Final Test ◽  
Mathematical Concepts ◽  
Quasi Experimental ◽  
Class Viii ◽  
The Mean ◽  
Randomized Control ◽  
And Control ◽  
Better Than

The purpose of this study is to determine the understanding on mathematic concept who were taught by using Quick On The Draw Technique was better than the students who were taught by using conventional technique at Class VIII SMPN 1 Ranah Batahan Kabupaten Pasaman Barat. Quasi experimental that designed randomized control group only design. The population of this research was class VIII students of SMP N 1 Ranah Batahan Kabupaten Pasaman Barat of 4 class. For determine the experimental class and the control class is done by randomly. Classes are chosen as experimental class is a class experiment is VIII.2 class and control class is the class VIII.3. The hypothesis of this study is understanding on mathematic concept who were taught using Quick On The Draw Technique was better that the students who were taught using conventional technique at class VIII of SMPN 1 Ranah Batahan Kabupaten Pasaman Barat. Based on the result of final test students’ understanding on mathematic concept in experiment class was higher than the control class. It can be seen from the mean score of experiment class 70.89,control class was 57.78.Hypothesis testing by using t-test showed that t-was higher than t-hitung>t-tabel  (1.97 > 1.68) with degree of freedom 95% so hypothesis is accepted. In conclusion, students’ understanding on mathematic concept who were taught by using Quick On The Draw technique was higher than the students who were taught by using conventional technique at calss VIII of SMPN 1 Ranah Batahan Kabupaten Pasaman Barat. Based on the above description the researcher gives advice to mathematical educator, to make quick on the draw technique as one of alternative to improve understanding of mathematical concepts of learners.Keyword : Quick on The Draw Technique, Understanding on Mathematic Concept

Free Convection in an Inclined Square Cavity With Partial Partitions on a Wavy Hot Wall

Volume 1 ◽  
2004 ◽  
Author(s):  
M. Belkadi ◽  
A. Azzi ◽  
O. Imine ◽  
L. Adjlout ◽  
M. Aounallah ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Free Convection ◽  
Numerical Study ◽  
Wavy Wall ◽  
Square Cavity ◽  
Inclination Angles ◽  
The Mean ◽  
Rayleigh Numbers ◽  
Partial Partitions ◽  
Wall Geometry

In the present investigation, a numerical study of the effect of the hot wavy wall with partial partitions on free convection in an inclined square cavity, differentially heated, was undertaken. This problem is solved by using the partial differential equations which are the equation of mass, momentum, and energy. The tests were performed for different inclination angles, partition lenghts and Rayleigh numbers while the Prandtl number was kept constant. A configuration with three undulations and three partitions has been tested. The results obtained show that the hot wall geometry with partions affects the heat transfer rate in the cavity. The mean Nusselt number decreases notably compared with the heat transfer in the square undulated cavity without partitions.

scholarly journals APPLICATION OF AUGMENTED DESIGNS FOR FIELD EVALUATION OF BREAD WHEAT DOUBLED HAPLOID LINES: A PRELIMINARY REPORT

AGROFOR ◽  
2018 ◽  
Vol 2 (3) ◽  
Author(s):  
Demetrios DIKEOPHYLAX ◽  
Iordanis OSSOUTZOGLOU ◽  
Chryssanthi PANKOU ◽  
Athanasios MAVROMATIS ◽  
Anastasios LITHOURGIDIS ◽  
...  
Keyword(s):  
Doubled Haploid ◽  
Total Yield ◽  
Field Evaluation ◽  
Kernel Weight ◽  
Doubled Haploid Lines ◽  
New Varieties ◽  
The Mean ◽  
And Control ◽  
New Germplasm ◽  
Better Than

Doubled-haploid is an effective method to produce 100% homozygous lines in asingle generation accelerating the release of new varieties and reducing thecorresponding expenses. However, the existing problem in cases where theadequate quantity of seeds is limited is the inability to evaluate new germplasm inreplicated experiments. In his attempt to confront this problem, Petersen proposedin 1985 the evaluation of new germplasm to be based on its division in blocks andselection to be performed regarding the yield of the randomly repeated control ineach block. The aim of the present study was to use the aforementioned method toevaluate preliminary 37 doubled-haploid lines (DHL). The parental varieties of theDHLs,Greek cultivars “Acheloos” and “Vergina”, were used as controls. For thepurpose of the study, 35 main spikes, one form each DHL and control, were used.The length of the spikes was measured, the number of spikelets was counted, andthe 1000 kernel weight and total yield were recorded. The data analysis revealedthat only one line exceeded the mean number of spikelets of the controls, oneexceeded the mean yield of the controls and two exceeded the mean 1000 kernelweight of the controls (one was even better than the best control). The reportedresults indicate the presence of valuable genetic variability among the DHL aftercrossing cultivars “Acheloos” x “Vergina”. Further research is needed, after DHLsmultiplication, using more plants and locations to draw more reliable conclusions.

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