Reports of the Committee Upon the Physiology of Vision. XI. Individual Differences in Normal Colour Vision: A Survey of Recent Experimental Work (1910-31).

JAMA ◽  
1933 ◽  
Vol 101 (21) ◽  
pp. 1666
Keyword(s):  
Individual Differences ◽  
Experimental Work ◽  
Colour Vision ◽  
Normal Colour ◽  
Recent Experimental Work

Modelling the effects of inter-observer variation on colour rendition

2017 ◽  
Vol 51 (1) ◽  
pp. 37-54 ◽  
Author(s):  
MJ Murdoch ◽  
MD Fairchild
Keyword(s):  
Colour Vision ◽  
Spectral Characteristics ◽  
Observer Variation ◽  
Light Sources ◽  
Standard Observer ◽  
Natural Range ◽  
Normal Colour ◽  
Range Of Variation

The colour rendition characteristics of light sources are quantified with measures based on CIE standard observers, which are reasonable representations of population averages. However, even among people with normal colour vision, the natural range of variation in colour sensitivity means any individual may see something different than the standard observer. Modelling results quantify the effects of these inter-observer differences on colour rendition measures defined by IES TM-30-15. In general, inter-observer differences tend to be smaller for light sources with high colour fidelity values, and they are affected by spectral characteristics of different lighting technologies. The magnitude of variation in colour rendition measures, up to 5–10 units in IES TM-30-15 ( Rf, Rg), measures is compared with other sources of variability and ambiguity.

Taxonomic studies on Archigetes Leuckart, 1878 (Cestoda: Caryophyllaeidae)

Parasitology ◽  
1965 ◽  
Vol 55 (3) ◽  
pp. 439-451 ◽  
Author(s):  
C. R. Keneedy
Keyword(s):  
Life History ◽  
Experimental Work ◽  
Nature Conservancy ◽  
The Family ◽  
Single Genus ◽  
Biological Characters ◽  
Taxonomic Studies ◽  
Relationship Of ◽  
Recent Experimental Work ◽  
The Relationship

Recent experimental work has indicated that species of Archigetes are capable of infecting and maturing in fishes in addition to tubificids.The genus Archigetes is re-defined on the basis of morphological and biological characters, with particular emphasis on recent life history studies. All species capable of neotenic development have been re-united in a single genus.A description of all species of Archigetes together with a key for their identification are included. New synonomies are discussed.The relationship of Archigetes to other genera of the family is briefly considered, and it is concluded that it forms the terminal stage in a series showing the attainment of neotenic development.I wish to thank Professor R. J. Pumphrey in whose Department the work was carried out, and Dr J. C. Chubb for advice and help in the preparation of this manuscript. I am also grateful to Professor K. Berg and Dr R. L. Calentine for the loan of specimens. The work was carried out during the tenure of a Nature Conservancy Research Studentship.

A Hospital-Based Cross-Sectional Study to Estimate the Prevalence and Sex Distribution of Colour Vision Deficiency among School Going Children Attending a Tertiary Eye Care Center in Kolkata City, West Bengal, India

2021 ◽  
Vol 8 (32) ◽  
pp. 2962-2967
Author(s):  
Rinki Saha ◽  
Indrajit Sarkar ◽  
Tamojit Chatterjee ◽  
Sandip Samaddar ◽  
Suman Chandra Sen
Keyword(s):  
School Children ◽  
Colour Vision ◽  
Care Center ◽  
Cross Sectional Study ◽  
Sex Distribution ◽  
Cross Sectional ◽  
Colour Vision Deficiency ◽  
Cone Pigments ◽  
Normal Colour ◽  
Colour Blindness

BACKGROUND Colour vision is a function of three types of cone pigments present in the retina. Colour vision deficiency is an important disorder of vision that may pose a handicap to the performance of an affected individual. The prevalence of colour blindness varies in different geographical areas. The identification and estimation of the prevalence of colour vision deficiency in school-going children will help to educate and guide the caregivers to help the children in selecting their profession. This study was done to estimate the prevalence, sex distribution, and types of colour vision deficiency among school-going children of 5 to 15 years. METHODS A cross-sectional observational study was done among 500 students to evaluate the colour vision during the period from 1st January 2018 to 30th June 2019 at the Regional Institute of Ophthalmology, Kolkata. Ishihara’s pseudo isochromatic colour vision chart 38th edition was used to assess the school children for colour vision status. The children who were found to be colour blind were further classified into degree and types of colour vision deficiency. RESULTS A total of 500 students (250 male & 250 female) of surrounding schools, in the age group of 5 years to 15 years, were screened. 480 students (96 %) had normal colour vision while 20 (4 %) students were found to have defective colour vision. Prevalence (4 %) for colour blindness was found to be higher in males (3.6 %) than females (0.4 %). It was observed that out of 20 (4 %) colour-blind subjects 3.6 % were protanopes and 0.4 % were deuteranopes. CONCLUSIONS The present study shows the prevalence of colour blindness found to be quite low (4 %) and more common in males (3.6 %) in comparison to females (0.4 %). Protanomaly (3.6 %) was more common than deuteranomaly (0.4 %). KEYWORDS Colour Blindness, Protanomaly, Deuteranomaly, School Children

Acceptability ratings cannot be taken at face value

2020 ◽  
pp. 189-214
Author(s):  
Carson T. Schütze
Keyword(s):  
Rate Of Convergence ◽  
Experimental Work ◽  
Rates Of Convergence ◽  
Original Method ◽  
Journal Articles ◽  
True Rate ◽  
Acceptability Judgments ◽  
Critical Words ◽  
Recent Experimental Work

This chapter addresses how linguists’ empirical (syntactic) claims should be tested with non-linguists. Recent experimental work attempts to measure rates of convergence between data presented in journal articles and the results of large surveys. Three follow-up experiments to one such study are presented. It is argued that the original method may underestimate the true rate of convergence because it leaves considerable room for naïve subjects to give ratings that do not reflect their true acceptability judgments of the relevant structures. To understand what can go wrong, the experiments were conducted in two parts. The first part had visually presented sentences rated on a computer, replicating previous work. The second part was an interview where the experimenter asked the participants about the ratings they gave to particular items, in order to determine what interpretation or parse they had assigned, whether they had missed any critical words, and so on.

scholarly journals ROTATIONAL TUNNELLING SPECTROSCOPY WITH NEUTRONS

1993 ◽  
Vol 07 (16n17) ◽  
pp. 3113-3151 ◽  
Author(s):  
C.J. CARLILE ◽  
M. PRAGER
Keyword(s):  
Experimental Work ◽  
Point Of View ◽  
Theoretical Point ◽  
Instrument Performance ◽  
New Approaches ◽  
Recent Experimental Work ◽  
Fruitful Field

Neutron tunnelling spectroscopy has been a very fruitful field for almost two decades and is still expanding into new areas, both experimentally and theoretically. The development of the topic is reviewed from the theoretical point of view, highlighting new approaches, and selected examples of more recent experimental work are presented. A brief discussion of instrument performance and experimental requirements is given.

Numerical Prediction of Various Cavitation Erosion Mechanisms

2020 ◽  
Vol 142 (4) ◽  
Author(s):  
Ignacijo Biluš ◽  
Marko Hočevar ◽  
Matevž Dular ◽  
Luka Lešnik
Keyword(s):  
Experimental Work ◽  
High Speed ◽  
Cavitation Erosion ◽  
Cavitating Flow ◽  
Numerical Prediction ◽  
Quantitative Prediction ◽  
Navier Stokes ◽  
Erosion Mechanisms ◽  
Recent Experimental Work ◽  
Collapse Phase

Abstract Numerical prediction of cavitation erosion is a great scientific and technological challenge. In the past, many attempts were made—many successful. One of the issues when a comparison between a simulation and erosion experiments is made, is the great difference in time scale. In this work, we do not attempt to obtain quantitatively accurate predictions of erosion process but concentrate qualitatively on cavitation mechanisms with quantitative prediction of pressure pulses which lead to erosion. This is possible, because of our recent experimental work on simultaneous observation of cavitating flow and cavitation erosion by high speed cameras. In this study, the numerical simulation was used to predict details of the cavitation process during the vapor collapse phase. The fully compressible, cavitating flow simulations were performed to resolve the formation of the pressure waves at cavitation collapse. We tried to visualize the mechanisms and dynamics of vapor structures during collapse phase at the Venturi geometry. The obtained results show that unsteady Reynolds-averaged Navier–Stokes (URANS) simulation of cavitation is capable of reproducing four out of five mechanisms of cavitation erosion, found during experimental work.

Sign in / Sign up

Export Citation Format

Share Document