Experimental Comparison between Salt Weathering Testing Procedures on Different Types of Bricks

2021 ◽  
Vol 33 (11) ◽  
pp. 04021305
Author(s):  
Swathy Manohar ◽  
Naresh Chockalingam ◽  
Manu Santhanam
Keyword(s):  
Experimental Comparison ◽  
Salt Weathering ◽  
Testing Procedures ◽  
Different Types

scholarly journals Moving Assessment Online: Experiences within a School of Pharmacy

2021 ◽  
Vol 25 (1) ◽  
Author(s):  
Kelsey Morgan ◽  
Erin Adams ◽  
Teresa Mary Elsobky ◽  
Marcia Brackbill ◽  
Amber Darr
Keyword(s):  
Clinical Skills ◽  
Internet Access ◽  
Open Book ◽  
Testing Procedures ◽  
Student Stress ◽  
Patient Interviews ◽  
Testing Strategies ◽  
Different Types ◽  
Physical Examinations ◽  
Assessment Procedures

The COVID-19 pandemic required academic institutions to quickly transition to online learning and make changes to assessment procedures. This study examines how a school of pharmacy creatively approached the challenge of online assessment while maintaining the standards necessary to prepare practice-ready student pharmacists. To conduct traditional exams, instructors deployed two different types of methods utilizing testing software: a video conferencing technology approach which mimicked pre-pandemic, on-campus proctored exams; or open-book, internet access-enabled exams that ensured academic integrity and rigor through various testing strategies. To assess students’ clinical skills, faculty used a combination of techniques such as physical examinations, patient interviews, and patient presentations. To understand the student experience with these assessments, students were surveyed using a 12-item questionnaire. Overall, online video proctoring maintained consistency in exam structure and administration, but required extensive instruction for both students and proctors. Students preferred unproctored, open-book, internet access-enabled, standard time exams versus proctored, closed-book, internet-access disabled, extended time exams. Changes to testing procedures, whether with proctored or unproctored methods, appeared to increase student stress.

Are staged dyadic encounters useful for studying aggressive behaviour of arvicoline rodents?

1997 ◽  
Vol 75 (7) ◽  
pp. 1051-1058 ◽  
Author(s):  
Steven J. Harper ◽  
George O. Batzli
Keyword(s):  
Aggressive Behaviour ◽  
Social Contact ◽  
Home Ranges ◽  
Laboratory Studies ◽  
Prairie Voles ◽  
Testing Procedures ◽  
Different Types ◽  
Before And After ◽  
Continued Use ◽  
Over Time

We investigated the aggressiveness of adult prairie voles (Microtus ochrogaster) in dyadic encounters staged in different types of arena trials to determine if responses differed (i) between neutral arena trials conducted in the laboratory and resident–intruder trials conducted in the field, (ii) between trials staged before and after 3 months of isolation from social contact, (iii) between voles reared in the laboratory and voles reared in the field, and (iv) among trials staged with the same individual over time. Though rodents are usually expected to be more aggressive on their own home range, female prairie voles tended to be more aggressive in neutral arenas. Males showed no difference in aggression between trials held in neutral arenas and trials held in arenas placed in their home ranges. Aggressiveness was not affected by 3 months of isolation for either males or females, suggesting that recent social cues may not strongly influence aggressive behaviour in this species. Voles reared in the laboratory were significantly more aggressive than those reared in enclosed field populations, which suggests that direct comparisons of field and laboratory studies of aggressive behaviour may be suspect. Individuals showed little change in aggressiveness when tested over several weeks in three trials with different opponents. We conclude that encounters staged in arenas provide standardized estimates of aggressiveness that are robust to differences in testing procedures and are repeatable over time. Therefore, their continued use seems warranted for studying aggressive behaviour of voles and lemmings.

scholarly journals Experimental Comparison of a 70 Watt Switched Reluctance Machine with Different Types of Converter Topologies

2017 ◽  
Vol 117 ◽  
pp. 306-313 ◽  
Author(s):  
Meda Venkata Nitesh ◽  
S. Arjun ◽  
Shaik Afzal Ahammed ◽  
P. Ramesh ◽  
N.C. Lenin
Keyword(s):  
Experimental Comparison ◽  
Switched Reluctance Machine ◽  
Switched Reluctance ◽  
Reluctance Machine ◽  
Different Types ◽  
Converter Topologies

EXPERIMENTAL COMPARISON BETWEEN PROPORTIONAL AND PWM-SOLENOID VALVES CONTROLLED SERVOPNEUMATIC POSITIONING SYSTEMS

2017 ◽  
Vol 41 (1) ◽  
pp. 65-83 ◽  
Author(s):  
Ramhuzaini Abd. Rahman ◽  
Nariman Sepehri
Keyword(s):  
Sliding Mode ◽  
Low Cost ◽  
Experimental Comparison ◽  
Pneumatic Cylinder ◽  
Adaptive Backstepping ◽  
Proportional Valve ◽  
Positioning Systems ◽  
Different Types ◽  
Backstepping Sliding Mode Control ◽  
Multiple Step

The performance of the Dynamical Adaptive Backstepping-Sliding Mode Control (DAB-SMC) scheme for positioning of a pneumatic cylinder regulated by two types of PWM-solenoid valves is experimentally investigated. The goal is to study the compromise in controller’s performance as the system moves from using a proportional valve to employing the low-cost PWM-solenoid valves. Sinusoidal and multiple-step inputs are used as the reference position trajectories. Experimental results show that the DAB-SMC scheme works best with the proportional valve. The performance, however, deteriorates by more than twofold, once the system utilizes PWM-solenoid valves of 3/2-way or 2/2-way configurations. From this study, trade-off between performances of different types of valves applied on a DAB-SMC scheme-controlled servo positioning system is successfully documented. This information helps to configure appropriate servo-pneumatic system for positioning applications.

scholarly journals FOUR-DIMENSIONAL BIOPRINTING FOR REGENERATIVE MEDICINE: MECHANISMS TO INDUCE SHAPE VARIATION AND POTENTIAL APPLICATIONS

2019 ◽  
pp. 36-43 ◽  
Author(s):  
Pedro Morouço
Keyword(s):  
Regenerative Medicine ◽  
Creative Thinking ◽  
Main Idea ◽  
Layer By Layer ◽  
Shape Variation ◽  
Exciting Field ◽  
Testing Procedures ◽  
Different Types ◽  
Near Future

Regenerative medicine is an exciting field of research, in which significant steps are being taken that are leading to the translation of the technique into clinical practice. In the near future, it is expected that clinicians will have the opportunity to bioprint tissues and organs that closely mimic native human tissues. To do so, imaging of patients must be translated to digital models and then fabricated in a layer-by-layer fashion. The main aim of this review is to elaborate on the possible mechanisms that support four-dimensional bioprinting, as well as provide examples of current and future applications of the technology. This technology, considering time as the fourth dimension, emerged with the aim to develop bioactive functional constructs with programmed stimuli responses. The main idea is to have three-dimensional-printed constructs that are responsive to preplanned stimuli. With this review, the authors aim to provoke creative thinking, highlighting several issues that need to be addressed when reproducing such a complex network as the human body. The authors envision that there are some key features that need to be studied in the near future: printed constructs should be able to respond to different types of stimuli in a timely manner, bioreactors must be developed combining different types of automated stimuli and aiming to replicate the in vivo ecology, and adequate testing procedures must be developed to obtain a proper assessment of the constructs. The effective development of a printed construct that supports tissue maturation according to the anticipated stimuli will significantly advance this promising approach to regenerative medicine.

scholarly journals On the Errors Involved in the Determination of Cooling Powers and Air Velocities with a Kata-Thermometer

1935 ◽  
Vol 35 (2) ◽  
pp. 255-261 ◽  
Author(s):  
O. J. Cockerell
Keyword(s):  
Hot Water ◽  
The Other ◽  
Experimental Comparison ◽  
Water Heating ◽  
Heating Systems ◽  
Different Types

During the experimental comparison of different types of hot-water heating systems in a school at Easter 1934 about a thousand kata readings were taken. These were taken mostly in pairs, one immediately after the other, and a third reading was taken only when the first two differed by more than about 10 per cent.

Heat Resistant Elastomers

2005 ◽  
Vol 78 (3) ◽  
pp. 489-515 ◽  
Author(s):  
Zhenghong Tao ◽  
Nantiya Viriyabanthorn ◽  
Bhavjit Ghumman ◽  
Carol Barry ◽  
Joey Mead
Keyword(s):  
High Temperature ◽  
Degradation Mechanisms ◽  
New Developments ◽  
Temperature Resistance ◽  
Testing Procedures ◽  
Heat Resistant ◽  
Temperature Performance ◽  
Different Types ◽  
High Temperature Resistance

Abstract This paper reviews the different types of heat resistant elastomers and the effects of compounding on the high temperature performance of these materials. Degradation mechanisms and testing procedures are discussed briefly. New developments in improving high temperature resistance are presented.

Condition Monitoring of Marine Couplings by Means of Vibration Analysis Techniques

2013 ◽  
Author(s):  
Simone Delvecchio ◽  
Gianluca D’Elia ◽  
Giorgio Dalpiaz
Keyword(s):  
Wavelet Transform ◽  
Frequency Domain ◽  
Vibration Analysis ◽  
Angular Speed ◽  
Experimental Comparison ◽  
Discrete Wavelet ◽  
Propeller Shaft ◽  
Frequency Domain Methods ◽  
Different Types ◽  
Marine Diesel

This paper shows the application of some processing techniques for the vibration analysis in working conditions of two different types of marine flexible couplings for boat propulsion. The flexible couplings are mounted between the flywheel of the marine diesel engine and the propeller shaft. The vibration signals are processed in time and frequency domain. Moreover, due to the presence of impulses in the signals, Continuous (CWT) and Discrete Wavelet Transform (DWT) are applied and compared with the conventional time and frequency domain methods. In this work the wavelet analysis is used for the impulse component extraction and the choice of different wavelet functions for this purpose is evaluated. The experimental comparison between two different types of couplings is also given. The results suggest that the wavelet transform techniques are effective to indicate which type of coupling provides a good vibrational behaviour especially in working condition when the angular speed of the propeller shaft is often inverted.

scholarly journals Control of Spring Softening and Hardening in the Squared Daisy

Micromachines ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 448
Author(s):  
Mathieu Gratuze ◽  
Abdul-Hafiz Alameh ◽  
Seyedfakhreddin Nabavi ◽  
Frederic Nabki
Keyword(s):  
Standardized Testing ◽  
Experimental Comparison ◽  
Maximal Velocity ◽  
Mems Resonator ◽  
Mems Resonators ◽  
Mems Actuators ◽  
Nonlinear Mechanical ◽  
Different Types ◽  
Operating Bandwidth ◽  
Nonlinear Behaviors

Nonlinear, mechanical microelectromechanical system (MEMS) resonating structures exhibit large displacement and a relatively broad operating bandwidth. These unique features make them particularly of interest for the development of MEMS actuators and sensors. In this work, a mechanical MEMS structure allowing the designer to determine the type of nonlinearity, that is, softening or hardening, based on its anchor scheme is presented. Effects of the excitation signal on the behavior of the proposed MEMS in the frequency domain are investigated. In this regard, a comprehensive experimental comparison among the nonlinear behaviors of softening and hardening has been conducted. To reduce the hysteresis effect to a minimum, an excitation approach, which is a pulsed sweep in frequency with a discrete resolution, is presented. The maximal velocity, quality factor, bandwidth, and resonant frequency of these two types of nonlinear MEMS resonators are compared under three different types of excitation. Finally, it is shown that the performance and characteristics extracted from nonlinear mechanical MEMS resonating structures are highly dependent on the excitation method. Hence, in the present case, the apparent performances of the MEMS resonator can increase by up to 150% or decrease by up to 21%, depending on the excitation approaches. This implies the necessity of a standardized testing methodology for nonlinear MEMS resonators for given end applications.

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