A comparative study between two different artificial substrate samplers and regular sampling techniques

Hydrobiologia ◽  
1974 ◽  
Vol 44 (4) ◽  
pp. 517-522 ◽  
Author(s):  
John S. Crossman ◽  
John Cairns
Keyword(s):  
Comparative Study ◽  
Artificial Substrate ◽  
Sampling Techniques ◽  
Regular Sampling

Comparative study of nail sampling techniques in onychomycosis

2009 ◽  
Vol 36 (7) ◽  
pp. 410-414 ◽  
Author(s):  
Avner SHEMER ◽  
Batya DAVIDOVICI ◽  
Marcelo H. GRUNWALD ◽  
Henri TRAU ◽  
Boaz AMICHAI
Keyword(s):  
Comparative Study ◽  
Sampling Techniques

scholarly journals An Approach to Natural Sampling Using a Digital Sampling Technique for SPWM Multilevel Inverter Modulation

Energies ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2925
Author(s):  
Mauricio Muñoz-Ramírez ◽  
Hugo Valderrama-Blavi ◽  
Marco Rivera ◽  
Carlos Restrepo
Keyword(s):  
Pulse Width ◽  
Output Voltage ◽  
Pulse Width Modulation ◽  
Sampling Technique ◽  
Multilevel Inverter ◽  
Sampling Techniques ◽  
Digital Technique ◽  
Digital Sampling ◽  
Natural Sampling ◽  
Regular Sampling

This paper introduces an approach that applies a digital sampling technique for a sinusoidal pulse width modulation (SPWM) multilevel inverter modulation that reduces the total harmonic contents in the output voltage compared to that of classical regular sampling techniques. This new modulation emulates with a high degree of fidelity a natural sampling pulse width modulation (PWM). The theoretical analysis of this new digital technique compared with natural sampling has been validated by simulations and through experiments with a built prototype that performed five–level inverter modulations with vertically displaced carriers in phase disposition. Both simulation and experimental results generate a SPWM output voltage with higher fidelity than classic regular sampling techniques, allowing a reduction of the filtering demands on the inverter output, which in turn can decrease the converter size and its manufacturing costs. As the presented technique is digital, the resulting modulation is more robust against switching noise, jitter, and other system perturbations and the modulation parameters can be changed easily, even in an automated way. For this reason, the modulation introduced here can be a useful tool to perform spectral analysis for different multilevel modulations and systems.

Comparative Study of Subgingival Microbiological Sampling Techniques

1992 ◽  
Vol 63 (10) ◽  
pp. 797-801 ◽  
Author(s):  
S. Renvert ◽  
M. Wikström ◽  
M. Helmersson ◽  
G. Dahlén ◽  
N. Claffey
Keyword(s):  
Comparative Study ◽  
Sampling Techniques

scholarly journals A comparative study of sampling techniques for monitoring carcass contamination

1984 ◽  
Vol 1 (4) ◽  
pp. 229-236 ◽  
Author(s):  
J.M.A. Snijders ◽  
M.H.W. Janssen ◽  
G.E. Gerats ◽  
G.P. Corstiaensen
Keyword(s):  
Comparative Study ◽  
Sampling Techniques ◽  
Carcass Contamination

scholarly journals THE GENDER BASED COMPARATIVE STUDY ON PERCEPTION OF PHYSICAL EDUCATION INSTRUCTORS ABOUT JOB PERFORMANCE

2020 ◽  
Vol 01 (01) ◽  
pp. 78-84
Author(s):  
Safdar Luqman ◽  
Zia Ul Islam ◽  
Afshan Jabeen
Keyword(s):  
Physical Education ◽  
Job Performance ◽  
Comparative Study ◽  
Random Sampling ◽  
Sampling Techniques ◽  
Policy Makers ◽  
The Mean ◽  
The Difference ◽  
Gender Based ◽  
Performance Scale

The present comparative study was conducted to observe the difference in stance of male and female Instructors’ Physical Educations (IPEs) regarding their Job Performance. A sample of 79 IPEs was selected over proportionate random sampling techniques to confirm the equal representation. For this drive, the self-made job performance scale was used for the data collection which was analyzed through independent sample t-test were used to find out the mean difference in perception of IPEs. The result of study showed that the difference in the stance of IPEs regarding their job performance is significant. Female IPEs performed better as compared to the male IPEs. The results are significant and expected to provide suitable guidelines to policy-makers of the concerned context regarding the physical education instructors about their job performance.

Comparative study of glass tube and mist chamber sampling techniques for the analysis of gaseous carbonyl compounds

2005 ◽  
Vol 39 (35) ◽  
pp. 6642-6653 ◽  
Author(s):  
Stéphanie François ◽  
Véronique Perraud ◽  
Maryline Pflieger ◽  
Anne Monod ◽  
Henri Wortham
Keyword(s):  
Comparative Study ◽  
Carbonyl Compounds ◽  
Glass Tube ◽  
Sampling Techniques ◽  
Mist Chamber
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