5153 research outputs found
Sort by
Semantics and Scale: The Impact of Polarity and Wording on Performance Evaluation
No full textThis study examined the impact of measurement scale wording on rater judgment and leniency in an employee performance evaluation context. Participants evaluated ratees in a task simulation video using a five-point anchored scale with either unipolar, bipolar, or no anchor labels. Findings partially supported the hypotheses, suggesting scale descriptors may affect performance rating accuracy
Feedback Controller Design andTest of a Buck- Boost Convertor
No full text© ASEE 2014Power electronics could be a terribly speedily growing region within the field of applied science. Devices that have
to be terrible power economically, and have long battery life, while still being sturdy are commonplace within
the contemporary world. DC-DC converters are to DC current devices what transformers are to AC devices.
There are many varieties of those converters with numerous topologies and practicality. The control
of convertor devices, so as to realize the system needs for common applications is important so as that the
appliance functions as required.
Control Students can realize specific interest within the modelling aspects of DC device system design; Power
students can realize convinced curiosity within the power transmission and delivery aspects of the design. The
design is going to be of interest to industrial computer systems students in making numerous interfaces by that to
implement the control; and renewable energy students can realize significant within the manner that
these management systems may be applied to the control of assorted renewable applications, as an example solar
power. Also, Back- Boost converter is step up/ down converter that allows the output voltage to be greater or lower
than the input voltage by changing duty-ratio D.
Photovoltaic systems are widely used to convert solar energy to electricity. The output of the PV system is strongly
affected by the weather. In order to maintain the stability of the power, rechargeable battery is necessary to store the
electricity temporarily. The author object, in this poster, is to make the output voltage of PV constant to connect its
rechargeable battery 12v DC. The power pole board helps students by raising or educing the output voltage by
adding other pieces to make Busk, Boost, and Back boost converter. Therefor, In this poster, the design of a
feedback control compensator device to suit Back- Boost converter is presented. The device that was used is a
configurable experimental laboratory device available by the University of Bridgeport. The Author had a target to
provide a fast and stable response to both input voltage disturbances and change in load resistance type disturbances.
The voltage output was required to remain constant 12v DC or return to steady state as fast as possible, whatever
input voltage that comes from a solar panel, and when there is any changes in load. The designer will use a transfer
function of the power stage (Back- Boost convertor) to find out the values of controller components such as (R, L
and C). Also, the author works on PSPICE even a MATLAB program to get on bode plot of Back- Boost convertor
then can simulate all figures in order to prove the feedback control circuit works theoretically and practically.
Furthermore, waves by oscilloscope will present to show the output and input of the Back - Boost convertor. Finally,
the voltage feedback controller circuit with a power pole board and solar panel will help in providing a constant
DC voltage source from a solar panel
The Human Brain Thermo Receptors: The Best Indicators for Reflecting the Feelings
No full textThermo receptors are part of the human brain, which
reflect differently with changed conditions. Thermo
receptors are classified into two categories: Warm and
cold thermo receptors. In this abstract, an acceptable
temperature analysis incentive is used for measuring the
warm and cold cup of coffee used by different age group
individuals. Both of the thermo receptors perceive the
feelings through the gird of cup that is applied on the
palm of the hand. Thus, both cold and warm probes are
used with different kinds of temperatures. The cold cup of
coffee was about 50 degree Fahrenheit and the warm cup
of coffee about 115 degree Fahrenheit. In this experiment,
participants showed different responses and reactions to
the cold and warm cup of coffee. We measured their
responses by giving them questionnaires based on five
Likert formula. The experiment assumes that the feelings
of human beings can be judged by creating portrait and reverse situation
COMSOL Simulation of MEMS Piezoelectrically Actuated Micropump
No full textIn this poster, the design and COMSOL simulation of a piezoelectric micropump with dome-shaped diaphragms and diffuser-nozzle fluid rectifiers is reported. The micropump uses piezoelectric ZnO film (less than 10μm thick) to actuate the vibration of a parylene dome diaphragm, so that microfluid can be pumped in and out of the chamber. The device is to be fabricated on silicon substrate with an IC-compatible process. Piezoelectric ZnO film is sputter-deposited on a parylene dome diaphragm with its C-axis oriented perpendicular to the dome surface. The micropump utilizes two symmetric dome diaphragms for improved pumping rate. Diffuser-nozzle elements are integrated with piezoelectrically actuated dome diaphragms to form a multi-chip micropump. Due to the MEMS (Microelectromechanical Systems) technology used, the proposed micropump has very small size (10×10×1.6mm3) and consumes extremely low power. It also shows negligible leakage up to 700 Pa static differential pressure. The function of the proposed micropump is verified with COMSOL simulation
Germination response of Arabidopsis toconcentration of Nitrates in an Aquaponic Hydroponic system
No full textArabidopsis thaliana (ecotype Columbia) was planted on sponges in 4 tanks with continuous aeration through airstones. Different amounts of fish under the same growing conditions for 5 weeks. An equal food-fish ratio was given to all tanks except the control which was a hydroponic setup with Murashige and Skoog solution, a plant growth medium, at 1/5 strength. The growth solution was changed once per week and fish water was partially changed every two weeks. pH, temperature, ammonia, nitrite, nitrate and plant number were recorded once per week. A slow growth was observed in all tanks and the control treatment died on the 3rd week
Should the Antibiotic Resistance of Group B Streptococcus be tested or is it just an extra expense?
No full textGoal: Determination of sensitivity of Group B streptococcus (GBS) isolates to penicillin, erythromycin, clindamycin, tetracycline and vancomycin. Material: The study was done with female patients from Bitola, Macedonia during the period of 10/2010-05/2013 that included 132 patients. 42 of the patients were pregnant and routinely screened between the 35-37 gestational week for the presence of GBS, and the rest of the patients were tested because they already had symptoms from GBS infection. Expected results: The results in the study are expected to show that GBS has a high percentage of resistance toward certain antibiotics. This information is expected to raise awareness in the country for the importance of the testing of the antibiotic resistance of GBS, and to advocate for specific protocols to be prepared and recommended by the Ministry of Health that will help properly prevent or treat infection with GBS in patients
Engage Students in Engineering – using Everyday Engineering Examples
No full textFifty percent of students entering engineering programs do not earn an engineering degree. Many students leave engineering because unsatisfactory experiences in introductory engineering courses in their first and second years. Improving student engagement through the use of everyday examples is one key ENGAGE strategy because research indicates that this strategy has a powerful impact upon students’ satisfaction with and perseverance in engineering. This project implemented Everyday Engineering Examples (E^3s) in four engineering classes to teach technical concepts through a ENGAGE E^3s mini-grant. This paper introduces ENGAGE project and E^3s and shares the benefits of our E^3s mini-grant experience and strategies of using the E^3s examples in engineering classes
Liquidity Ratios in Bank Loan Covenants
No full textBank loan covenants are restrictions that require stated levels of performance by borrowers, and are often measured by standard financial ratios. The research on loan covenants has assumed that these measures are useful, providing information to lenders as to the viability of borrowers. This analysis uses a sample of current ratios to suggest that such balance sheet ratios may have limited predictive value of impeding defaults, and proposes that total receipts-to-cash flow, a ratio comprised of data from both significant financial statements, provides superior forecasts of such outcomes. The research is based on U.S. experience during the recent credit crisis
The Scribe
No full textThis is the October 2014 edition of the Scribe, Issue 4. The front page features an article on the History Channel's mini series on Houdini as well as a short story entitled, "Why I wear pink". Additional coverage includes photographs from the Harvest Fair and entertainment news
Flexible Learning: A New Vision of the University in the Eyes of Its Pupils
No full textJerald D. Cole's poster about flexible learning and the dichotomy between onsite and online learning