Initial Testing of the HiTek Solar Tracking Monitor

2012 ◽  
Author(s):  
Stephen Kusek ◽  
Michael Caraway ◽  
Timothy McFarland ◽  
Matthew Lynn ◽  
Aaron Sahm ◽  
...  
Keyword(s):  
Measurement Error ◽  
Data Collection ◽  
Las Vegas ◽  
High Accuracy ◽  
Energy Research ◽  
Solar Tracking ◽  
Record Data ◽  
Position Data ◽  
The University ◽  
Better Than

HiTek Services, Inc. has designed, fabricated, and tested a solar monitoring system that can measure the sun’s position with high accuracy. Sun position data, measured by the University of Nevada, Las Vegas Center for Energy Research, is presented showing that the instrument’s accuracy is better than 0.004 degrees (one σ). A histogram is presented showing that nearly 100 % of the time the measurement error is less than 0.008 degrees. The capability of using multiple sun monitors with synchronized data collection to measure the structural bending of one part of a tracking structure relative to another part of the structure is discussed and data are presented. Other operating features, such as being self-contained, no external cables required, and the ability to record data for a week without recharging the batteries, are discussed.

scholarly journals FINGERPRINT EMPLOYEE CLOCKING SYSTEM FOR UNIVERSITIES

2020 ◽  
Vol 7 (11) ◽  
pp. 69-76
Author(s):  
Debrah Joshua Osei ◽  
Alfred Elolo Konglo ◽  
Mohammed Issah Adinkrah ◽  
Lord Anertei Tetteh ◽  
Kojo Boakye ◽  
...  
Keyword(s):  
Work Environment ◽  
Employee Performance ◽  
Electronic Record ◽  
High Accuracy ◽  
Accuracy Rate ◽  
High Level ◽  
Employee Attendance ◽  
The University ◽  
Better Than

A system that is used for time-clocking, creating an all-inclusive electronic record of the process involved in how employees logs in and out of work on working days are referred to as a clocking system. The system has an additional feature of calculating an accurate payroll system, which in turn, can lead to a precise amount the company spent on labour. In essence, an employee clocking system is a process of monitoring the attendance, presence and truancy of employees in a work environment. In this project, the University of Energy and Natural Resources was used as a case study. The existing method of recording the presence of staff to work is by a manual process where employees record their attendance on a paper. The challenge of the current employee attendance system is the difficulty in tracing old records, safekeeping, lack of confidentiality and the chances of other employees logging in for their truant colleagues. This paper sought to introduce a biometric employee clocking system to help overcome the high level of truancy in workplaces. The results of the experiment we conducted indicate a high accuracy in our system with TAR value of 99.7%. This accuracy rate is much better than the results other researchers obtained. The excellent accuracy implies that employees will have difficulty to check-in or out for their truant colleagues. The high accuracy results will help improved security of attendance, improved employee performance, ensures fast and easy retrieval of data, easy monitoring of staff, and prevent impersonation in the attendance logs.

Field Testing and Performance of an Amonix Multi-Junction Cell Module at the University of Nevada Las Vegas

2007 ◽  
Author(s):  
Kenneth W. Stone ◽  
Robert Gordon ◽  
David Dutra ◽  
Allison Gray ◽  
Rick Hurt ◽  
...  
Keyword(s):  
Power Efficiency ◽  
Las Vegas ◽  
Field Testing ◽  
Next Generation ◽  
Energy Research ◽  
High Concentration ◽  
Single Plate ◽  
And Performance ◽  
The University ◽  
Cell Module

This paper discusses the installation, operation, and performance of a high concentration photovoltaic single-plate, multi-junction module developed by Amonix and installed at the Center for Energy Research at the University of Nevada, Las Vegas (UNLV). The paper discusses the objectives and goals of this project and describes the principal of the Fresnel optics, the module, and how it was attached to the Amonix 25-kW unit located at the UNLV Center for Energy Research. Also described are how the module is connected to a load and the measurements taken. Data is presented in the paper showing the module has produced power for over 2200 hours at a power efficiency of 26% to 28.6%. Data is also presented showing the next generation single-plate, multi-junction module achieving an efficiency of nearly 30%.

scholarly journals Current 14C Measurements with the University of Washington FN Tandem Accelerator

Radiocarbon ◽  
1983 ◽  
Vol 25 (2) ◽  
pp. 711-718 ◽  
Author(s):  
G W Farwell ◽  
P M Grootes ◽  
D D Leach ◽  
F H Schmidt ◽  
Minze Stuiver
Keyword(s):  
Mass Spectrometry ◽  
Standard Deviation ◽  
Data Collection ◽  
Accelerator Mass Spectrometry ◽  
Tandem Accelerator ◽  
Concentration Measurements ◽  
One To One ◽  
Counting Statistics ◽  
The University ◽  
Better Than

Our accelerator mass spectrometry (AMS) system shows a one-to-one relationship between sample 14C concentrations determined by AMS - and by β-counting. Measurements of unknown samples against a standard indicate that 14C concentration measurements to better than 2% can be made. For a 30-second data collection interval in a typical run of 100 intervals, the variability of the beam injected into the accelerator is ca 2%, that of the machine transmission is ca 4%, and counting statistics give 4.7% standard deviation for a sample of 80% of modern carbon.

Advances in imaging SIMS studies of stained and BrdU-labelled human metaphase chromosomes

1995 ◽  
Vol 53 ◽  
pp. 932-933
Author(s):  
R. Levi-Setti ◽  
J. M. Chabala ◽  
R. Espinosa ◽  
M. M. Le Beau
Keyword(s):  
High Performance ◽  
Secondary Ion Mass Spectrometry ◽  
Analytical Sensitivity ◽  
Metaphase Chromosomes ◽  
Banding Patterns ◽  
Sector Mass Spectrometer ◽  
Staining Methods ◽  
The University ◽  
Secondary Ion ◽  
Better Than

We have shown previously that isotope-labelled nucleotides in human metaphase chromosomes can be detected and mapped by imaging secondary ion mass spectrometry (SIMS), using the University of Chicago high resolution scanning ion microprobe (UC SIM). These early studies, conducted with BrdU- and 14C-thymidine-labelled chromosomes via detection of the Br and 28CN- (14C14N-> labelcarrying signals, provided some evidence for the condensation of the label into banding patterns along the chromatids (SIMS bands) reminiscent of the well known Q- and G-bands obtained by conventional staining methods for optical microscopy. The potential of this technique has been greatly enhanced by the recent upgrade of the UC SIM, now coupled to a high performance magnetic sector mass spectrometer in lieu of the previous RF quadrupole mass filter. The high transmission of the new spectrometer improves the SIMS analytical sensitivity of the microprobe better than a hundredfold, overcoming most of the previous imaging limitations resulting from low count statistics.

A Design of High-Accuracy Displacement Measurement Instrument from Principles of Optics

2012 ◽  
Vol 170-173 ◽  
pp. 2924-2928
Author(s):  
Sheng Biao Chen ◽  
Yun Zhi Tan
Keyword(s):  
Measurement Instrument ◽  
High Accuracy ◽  
Mechanical Tests ◽  
Total Reflection ◽  
Displacement Measurement ◽  
New Method ◽  
Water Volume ◽  
Water Drainage ◽  
Accuracy Of Measurement ◽  
Better Than

In order to measure the water drainage volume in soil mechanical tests accurately, it develop a new method which is based on principles of optics. And from both physical and mathematic aspects, it deduces the mathematic relationship between micro change in displacement and the increment projected on screen. The result shows that total reflection condition is better than refraction condition. What’s more, the screen could show the water volume micro variation clearly, so it can improve the accuracy of measurement.

Integration of statistical and administrative agricultural data from Namibia

2021 ◽  
pp. 1-22
Author(s):  
Emily Berg ◽  
Johgho Im ◽  
Zhengyuan Zhu ◽  
Colin Lewis-Beck ◽  
Jie Li
Keyword(s):  
Measurement Error ◽  
Data Collection ◽  
Administrative Data ◽  
Statistical Data ◽  
Data Sources ◽  
Extension Programs ◽  
Multiple Data ◽  
Administrative Agencies ◽  
Crop Area ◽  
Using Data

Statistical and administrative agencies often collect information on related parameters. Discrepancies between estimates from distinct data sources can arise due to differences in definitions, reference periods, and data collection protocols. Integrating statistical data with administrative data is appealing for saving data collection costs, reducing respondent burden, and improving the coherence of estimates produced by statistical and administrative agencies. Model based techniques, such as small area estimation and measurement error models, for combining multiple data sources have benefits of transparency, reproducibility, and the ability to provide an estimated uncertainty. Issues associated with integrating statistical data with administrative data are discussed in the context of data from Namibia. The national statistical agency in Namibia produces estimates of crop area using data from probability samples. Simultaneously, the Namibia Ministry of Agriculture, Water, and Forestry obtains crop area estimates through extension programs. We illustrate the use of a structural measurement error model for the purpose of synthesizing the administrative and survey data to form a unified estimate of crop area. Limitations on the available data preclude us from conducting a genuine, thorough application. Nonetheless, our illustration of methodology holds potential use for a general practitioner.

scholarly journals Temperature Prediction of PMSMs Using Pseudo-Siamese Nested LSTM

2021 ◽  
Vol 12 (2) ◽  
pp. 57
Author(s):  
Yongping Cai ◽  
Yuefeng Cen ◽  
Gang Cen ◽  
Xiaomin Yao ◽  
Cheng Zhao ◽  
...  
Keyword(s):  
Electric Vehicles ◽  
Simple Structure ◽  
High Accuracy ◽  
Stator Winding ◽  
High Power Density ◽  
Temperature Prediction ◽  
Permanent Magnet Synchronous Motors ◽  
Training Performance ◽  
Synchronous Motors ◽  
Better Than

Permanent Magnet Synchronous Motors (PMSMs) are widely used in electric vehicles due to their simple structure, small size, and high power-density. The research on the temperature monitoring of the PMSMs, which is one of the critical technologies to ensure the operation of PMSMs, has been the focus. A Pseudo-Siamese Nested LSTM (PSNLSTM) model is proposed to predict the temperature of the PMSMs. It takes the features closely related to the temperature of PMSMs as input and realizes the temperature prediction of stator yoke, stator tooth, and stator winding. An optimization algorithm of learning rate combined with gradual warmup and decay is proposed to accelerate the convergence during the training and improve the training performance of the model. Experimental results reveal the proposed method and Nested LSTM (NLSTM) achieves high accuracy by comparing with other intelligent prediction methods. Moreover, the proposed method is slightly better than NLSTM in temperature prediction of PMSMS.

scholarly journals Sustainable Teacher Training via Distance Education: The Effect of Study Centers, Gender and Economic Demographics on Academic Performance

2021 ◽  
Vol 13 (14) ◽  
pp. 7965
Author(s):  
Hong Zhang ◽  
Wilson Osafo Apeanti ◽  
Paul Georgescu ◽  
Prince Harvim ◽  
Dianchen Lu ◽  
...  
Keyword(s):  
Teacher Education ◽  
Distance Education ◽  
Academic Performance ◽  
Education Program ◽  
Teacher Education Program ◽  
Policy Implications ◽  
Education Students ◽  
Traditional Mode ◽  
The University ◽  
Better Than

We examine the effectiveness and sustainability of the distance teacher education program established by the University of Education, Winneba, Ghana, by investigating the differences in the academic performance of students who are trained in the teacher education program via traditional and distance education modes, respectively, from 2011 to 2015. Close attention is paid to the factors that affect the academic performance of students in the distance mode. Our findings confirm that traditional mode students perform better than their distance mode counterparts in terms of cumulative GPAs. Gender and economic demographics of distance study centers are found to affect the academic performance of distance education students significantly. The policy implications of these findings are discussed and directions of further action are outlined.

scholarly journals Development and Results from Application of PCM-Based Storage Tanks in a Solar Thermal Comfort System of an Institutional Building—A Case Study

Energies ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3877 ◽  
Author(s):  
F. Javier Batlles ◽  
Bartosz Gil ◽  
Svetlana Ushak ◽  
Jacek Kasperski ◽  
Marcos Luján ◽  
...  
Keyword(s):  
Phase Change Materials ◽  
Exergy Analysis ◽  
Heating System ◽  
Storage Tanks ◽  
Research Groups ◽  
Energy Research ◽  
Solar Cooling ◽  
Daily Energy ◽  
The University

An important element of a solar installation is the storage tank. When properly selected and operated, it can bring numerous benefits. The presented research relates to a project that is implemented at the Solar Energy Research Center of the University of Almeria in Spain. In order to improve the operation of the solar cooling and heating system of the Center, it was upgraded with two newly designed storage tanks filled with phase change materials (PCM). As a result of design works, commercial material S10 was selected for the accumulation of cold, and S46 for the accumulation of heat, in an amount of 85% and 15%, respectively. The article presents in detail the process of selecting the PCM material, designing the installation, experimental research, and exergy analysis. Individual tasks were carried out by research groups cooperating under the PCMSOL EUROPEAN PROJECT. Results of tests conducted on the constructed installation indicate that daily energy saving when using a solar chiller with PCM tanks amounts to 40% during the cooling season.

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