scholarly journals Perancangan Instalasi Penerangan Pada Gedung Laboratorium Dan Perkuliahan Terpadu Universitas Borneo Tarakan

2021 ◽  
Vol 7 (1) ◽  
pp. 11-18
Author(s):  
Aprizulkifli Aprizulkifli ◽  
Sugeng Riyanto
Keyword(s):  
Total Power ◽  
The University

The design of the lighting installation in the Integrated Lecture and Laboratory Building of the University of Borneo Tarakan. Generates a total power of about 31,048 KW with MCCB capacity on the main panel of 150 A. In this building is divided into 3 floors (1, 2 and Top Floor). Each group has its respective power (18,400, 12,328 and 320 Watt) and the nominal currents of each group are (35, 35, and 2 Ampere). The resulting stress loss is 0.4%

scholarly journals Power Spectral Analysis of Heart Rate Variability in Heavy Workers

1970 ◽  
Vol 7 (1) ◽  
pp. 15-19
Author(s):  
S Mithun ◽  
N Begum ◽  
MM Hossain ◽  
S Ferdousi ◽  
R Tabassum
Keyword(s):  
Physical Activity ◽  
Heart Rate ◽  
Heart Rate Variability ◽  
Power Spectral Analysis ◽  
Regular Physical Activity ◽  
Total Power ◽  
Socioeconomic Condition ◽  
Power Spectral ◽  
The University ◽  
Sedentary Subjects

Introduction: Sedentary life style deteriorates Cardiac autonomic nervous activities (CANA). Regular physical activity may improve CANA. Objective: Heart rate variability (HRV) was analyzed by Power Spectral method in heavy workers to find out the influence of regular physical activity on CANA. Methods: This cross sectional study was carried out on 30 heavy workers aged 28-50 years (study group), at the Department of Physiology, Bangabandhu Sheikh Mujib Medical University (BSMMU) over a period of 1 year. Simultaneously 30 sedentary workers of high socioeconomic status (group C) were studied to observe the influence of socioeconomic condition on heart rate variability (HRV). For comparison thirty age, sex, body mass index (BMI) and socioeconomic condition matched apparently healthy sedentary subjects (control) were also studied. The study subjects were selected from rickshaw-pullers living in the slum area nearby the university and the controls from fourth class employee of the university. Group C were selected from the doctors serving in the university and some from personal contacts. Total power, low frequency (LF) power, high frequency (HF) power, LF nu (neutralized unit), HF nu and LF/HF ratio were assessed and analyzed by a Polygraph. For statistical analysis, one way analysis of variance (ANOVA), Independent-samples t-test and Pearson's correlation coefficient tests were done. Results: Total power, HF power and HF nu were significantly (p<0.001) higher and LF power, LF nu and LF/HF ratio were significantly (p<0.001) lower in heavy workers than those of sedentary subjects. Total power and HF nu showed positive correlations and LF nu and LF/HF ratio showed negative correlation with duration of works per day but all these correlations were statistically non-significant. Conclusion: Regular physical activity improves cardiac autonomic nerve function status with a cardiac parasympathetic predominance. Key words: Power spectral analysis (PSA); cardiac autonomic nervous activities (CANA); heavy workers; sedentary workers DOI: http://dx.doi.org/10.3329/jafmc.v7i1.8620 JAFMC Bangladesh. Vol 7, No 1 (June) 2011; 15-19

Numerical Assessment of the Aerodynamic Properties of a Solar Vehicle

2013 ◽  
Author(s):  
Warrick D. Kin ◽  
Sunita Kruger ◽  
Nickey Janse van Rensburg ◽  
Leon Pretorius
Keyword(s):  
South African ◽  
Aerodynamic Resistance ◽  
Rolling Resistance ◽  
Aerodynamic Characteristics ◽  
Navier Stokes ◽  
Total Power ◽  
Aerodynamic Properties ◽  
Numerical Assessment ◽  
Sst Turbulence Model ◽  
The University

Due to wide emphasis on climate change today, alternative fuel research is necessary. Consequently, the South African Solar Challenge has created a competitive platform for research into alternative energies, particularly solar. The University of Johannesburg (UJ) competed in the competition using their uniquely designed and built solar vehicle, Ilanga I. However, due to the constraints of the energy available, the aerodynamics of the vehicle has to be exceptionally good. Subsequently, a large proportion of the total power of the vehicle is used to overcome the aerodynamic resistance posed by the vehicle. Furthermore, much of the remaining power of the vehicle is used to overcome rolling resistance. Consequently, solar vehicles have to be as lightweight as possible in order to effectively reduce the rolling resistance. However, reducing weight of the vehicle results in the vehicle’s stability being greatly affected by side-wind effects. In order to improve on the vehicle, it is very important to test for and obtain its aerodynamic characteristics. This research article aims at obtaining the average drag coefficient felt during the majority of the race as well as the lift coefficients for side-wind cases, in order to investigate vehicle safety. Thus, through the use of Computational Fluid Dynamics (CFD), it was possible to obtain an assessment of the vehicle’s performance. Simulations were performed using the Reynold’s Averaged Navier Stokes (RANS) method with use of the k-ω SST turbulence model. This method of simulation showed reasonable predictions of the results as compared to literature.

scholarly journals Response Surface Methodology for 30 kW PEMFC stack characterization

2022 ◽  
Vol 334 ◽  
pp. 04006
Author(s):  
Eleonora Gadducci ◽  
Stefano Saccaro ◽  
Massimo Rivarolo ◽  
Loredana Magistri
Keyword(s):  
Cell Voltage ◽  
Statistical Investigation ◽  
Total Power ◽  
Electrolyte Membrane ◽  
Reciprocal Influence ◽  
Voltage Variation ◽  
Controllable Factors ◽  
Experimental Management ◽  
Marine Applications ◽  
The University

Hydrogen is a promising energy carrier to allow the reach of the zero-emission targets established for the next years. Polymeric Electrolyte Membrane FC are studied inside the HI-SEA laboratory of the University of Genoa, to assess the opportunities of this technology on marine applications. Here, 8 PEMFC stacks, sized 30 kW each for a total power installation of 240 kW, have been tested to draw guidelines for the best system design onboard ships and to deepen the know-how on the experimental management of the technology. During the tests, it was possible to observe the reciprocal influence of some parameters, which may influence the system efficiency. In this work, a statistical investigation is developed to quantify the cell voltage variation correlated to the values of temperature and current. This has been possible thanks to Design Expert (DE), a software developed by Stat-EASE, Inc. Through the Design of Experiment approach, it is possible to evaluate the significance of variables in the FC system, called factors. The experiment under consideration is also characterized by non-controllable factors, cause of disturbances that induce further variability in the response. Eventually, it was possible to analyse the significance of the parameters involved, to build a regression model by performing the analysis of variance with which the significant values are identified, and to assess the presence of outliers.

Proceedings of The Modern Language Association of America

PMLA ◽  
1935 ◽  
Vol 50 (4) ◽  
pp. 1343-1343
Keyword(s):  
Modern Language Association ◽  
Modern Language ◽  
Local Committee ◽  
Tuesday Morning ◽  
University Of Cincinnati ◽  
The University ◽  
Plaza Hotel

The fifty-second meeting of the Modern Language Associationof America was held, on the invitation of the University of Cincinnati, at Cincinnati, Ohio, Monday, Tuesday, and Wednesday, December 30 and 31, 1935, and January 1, 1936. The Association headquarters were in the Netherland Plaza Hotel, where all meetings were held except those of Tuesday morning and afternoon. These took place at the University of Cincinnati. Registration cards at headquarters were signed by about 900, though a considerably larger number of members were in attendance. The Local Committee estimated the attendance at not less than 1400. This Committee consisted of Professor Frank W. Chandler, Chairman; Professor Edwin H. Zeydel; Professor Phillip Ogden; Mr. John J. Rowe (for the Directors); and Mr. Joseph S. Graydon (for the Alumni).

Spectrophotometric reductions with an IBM 1620

1966 ◽  
Vol 24 ◽  
pp. 116-117
Author(s):  
P.-I. Eriksson
Keyword(s):  
Astronomical Data ◽  
Spectrophotometric Data ◽  
Electronic Computers ◽  
The University ◽  
Near Future

Nowadays more and more of the reductions of astronomical data are made with electronic computers. As we in Uppsala have an IBM 1620 at the University, we have taken it to our help with reductions of spectrophotometric data. Here I will briefly explain how we use it now and how we want to use it in the near future.

Novae in the Magellanic Clouds

1979 ◽  
Vol 46 ◽  
pp. 96-101
Author(s):  
J.A. Graham
Keyword(s):  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Magellanic Clouds ◽  
University Of Michigan ◽  
The Past ◽  
Spectroscopic Information ◽  
Objective Prism ◽  
The University ◽  
Small Cloud ◽  
Low Dispersion

During the past several years, a systematic search for novae in the Magellanic Clouds has been carried out at Cerro Tololo Inter-American Observatory. The Curtis Schmidt telescope, on loan to CTIO from the University of Michigan is used to obtain plates every two weeks during the observing season. An objective prism is used on the telescope. This provides additional low-dispersion spectroscopic information when a nova is discovered. The plates cover an area of 5°x5°. One plate is sufficient to cover the Small Magellanic Cloud and four are taken of the Large Magellanic Cloud with an overlap so that the central bar is included on each plate. The methods used in the search have been described by Graham and Araya (1971). In the CTIO survey, 8 novae have been discovered in the Large Cloud but none in the Small Cloud. The survey was not carried out in 1974 or 1976. During 1974, one nova was discovered in the Small Cloud by MacConnell and Sanduleak (1974).

Production of New and Revised A.A.V.S.O. Charts

1979 ◽  
Vol 46 ◽  
pp. 368
Author(s):  
Clinton B. Ford
Keyword(s):  
Variable Star ◽  
Standard Form ◽  
Original Data ◽  
University Of Pennsylvania ◽  
Standard Format ◽  
Additional Information ◽  
The Gift ◽  
The University

A “new charts program” for the Americal Association of Variable Star Observers was instigated in 1966 via the gift to the Association of the complete variable star observing records, charts, photographs, etc. of the late Prof. Charles P. Olivier of the University of Pennsylvania (USA). Adequate material covering about 60 variables, not previously charted by the AAVSO, was included in this original data, and was suitably charted in reproducible standard format.Since 1966, much additional information has been assembled from other sources, three Catalogs have been issued which list the new or revised charts produced, and which specify how copies of same may be obtained. The latest such Catalog is dated June 1978, and lists 670 different charts covering a total of 611 variables none of which was charted in reproducible standard form previous to 1966.

Heat-Etching with a Bullivant Type II Simple Freeze-Cleave Device

1970 ◽  
Vol 28 ◽  
pp. 106-107 ◽  
Author(s):  
Ronald S. Weinstein ◽  
N. Scott McNutt
Keyword(s):  
New Zealand ◽  
General Hospital ◽  
Massachusetts General Hospital ◽  
Type I ◽  
Type Ii ◽  
Collaborative Effort ◽  
Temperature And Pressure ◽  
The University

The Type I simple cold block device was described by Bullivant and Ames in 1966 and represented the product of the first successful effort to simplify the equipment required to do sophisticated freeze-cleave techniques. Bullivant, Weinstein and Someda described the Type II device which is a modification of the Type I device and was developed as a collaborative effort at the Massachusetts General Hospital and the University of Auckland, New Zealand. The modifications reduced specimen contamination and provided controlled specimen warming for heat-etching of fracture faces. We have now tested the Mass. General Hospital version of the Type II device (called the “Type II-MGH device”) on a wide variety of biological specimens and have established temperature and pressure curves for routine heat-etching with the device.

Some Biological Applications of High Voltage Electron Microscopy

1974 ◽  
Vol 32 ◽  
pp. 298-299
Author(s):  
Hans Ris
Keyword(s):  
High Voltage ◽  
Chromosome Structure ◽  
Nerve Fibers ◽  
Good Resolution ◽  
High Voltage Electron Microscopy ◽  
Voltage Electron ◽  
University Of Wisconsin ◽  
High Voltage Electron ◽  
One Year ◽  
The University

The High Voltage Electron Microscope Laboratory at the University of Wisconsin has been in operation a little over one year. I would like to give a progress report about our experience with this new technique. The achievement of good resolution with thick specimens has been mainly exploited so far. A cold stage which will allow us to look at frozen specimens and a hydration stage are now being installed in our microscope. This will soon make it possible to study undehydrated specimens, a particularly exciting application of the high voltage microscope.Some of the problems studied at the Madison facility are: Structure of kinetoplast and flagella in trypanosomes (J. Paulin, U. of Georgia); growth cones of nerve fibers (R. Hannah, U. of Georgia Medical School); spiny dendrites in cerebellum of mouse (Scott and Guillery, Anatomy, U. of Wis.); spindle of baker's yeast (Joan Peterson, Madison) spindle of Haemanthus (A. Bajer, U. of Oregon, Eugene) chromosome structure (Hans Ris, U. of Wisconsin, Madison). Dr. Paulin and Dr. Hanna are reporting their work separately at this meeting and I shall therefore not discuss it here.

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