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Search Results: 1 - 10 of 3851 matches for " Light "
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Psychology of Light: How Light Influences the Health and Psyche  [PDF]
Rosella Tomassoni, Giuseppe Galetta, Eugenia Treglia
Psychology (PSYCH) , 2015, DOI: 10.4236/psych.2015.610119
Abstract: Light is the stimulus that influences most the human perception, but also the psychophysical well-being of the individual in everyday life. This paper analyzes the light from a psychological point of view, investigating the relationships between light-based emotions and behaviours, and the psychophysical responses to lit environment by the perceivers in different experiential contexts. Light becomes, therefore, “Cognitive Map” and “Emotional Driver”, but also a “Gestaltic Device” for the perceiver, in order to understand and interpret the external reality. Even the dark and lighting deprivation were considered, not only as environmental conditioning on the mood (Fusco, 2005a), but also through the psychological analysis of specific light manipulation techniques, such as “Sendep” and “Ganzfeld Effect”. Finally, some guidelines were shown to improve health and wellness of the individual exposed to the light in a given environment (healthy lighting), getting to define an “Ecological” approach to light and lighting perception in human life, that would also involve some light-based techniques, such as Light Design and Light Art.
A New Analysis Method for Locating the Focus and for Estimating the Size of the Focus of the Backscatter Light of a LIDAR System  [PDF]
Nianwen Cao, Weiyuan Wang, Yonghua Wu, Fred Moshary, Zhongrong Chen, Jiansong Huang
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2010, DOI: 10.4236/jemaa.2010.23026
Abstract: This paper presents a new analysis method for locating the focus and estimating the size of the focus of the backscatter light of a Lidar system. The formula for calculating the uncertainty of the location of the focus of backscatter light of a Lidar system is given, and the estimation of the size of the focus is also presented. This calculation coincides with the analysis result of ZEMAX software. By the analysis, the experiment to exactly locate the focus of the backscatter light of Lidar is carried out.
A Clinico-Pathological Study of Poly Morphous Light Eruption  [PDF]
Prasad Pullabatla, Kaviarasan Pitchai Kaliyaperumal, Udhay Sidhu
Journal of Cosmetics, Dermatological Sciences and Applications (JCDSA) , 2012, DOI: 10.4236/jcdsa.2012.23041
Abstract: The prevalence of PMLE varies from 5% to 15% in various studies across the world. PMLE is noticed in the first three decades of life. The mean age in females is 33 years whereas in males it is 35 years. Females are more often affected than males. PMLE appears to be an immunologically mediated response possibly a delayed hypersensitivity phenomenon to a photo antigen induced or up regulated in the skin after sun exposure. One hundred new PMLE cases were included in a two year period from 2006-8. All patients, who had been on treatment and with concomitant dermatoses were excluded. On histo-pathological examination 68% showed diagnostic features, 20% showed grade-II features and 12% grade-III features. Histo-pathological grading also varied with the duration of the disease. Early lesions showed only grade-II and III picture whereas the diagnostic picture was evident with the longer duration of the disease. In the plaque type, 14 cases showed characteristic histology after three to four months. In conclusion PMLE is commonly observed in females between 21 - 30 years of age. Pruritus is the chief complaint and the time required for the development of rash increases with time of sun exposure. Most common morphological type is papule on the forearm. Papules and plaque type of lesions of PMLE of longer duration clinched the histo-pathological diagnosis.
Regulation of Photoassimilate Distribution between Source and Sink Organs of Crops through Light Environment Control in Greenhouses  [PDF]
Lina Wang, Xiaoyu Yang, Zhonghai Ren, Xiufeng Wang
Agricultural Sciences (AS) , 2014, DOI: 10.4236/as.2014.54028

Photosynthesis, the most important physiological process in plants, can produce not only ATP and NADPH used in other processes but also carbohydrate, the key factor for crop yield. Production of photoassimilates is often influenced by various environmental factors such as light, temperature, CO2, water, mineral elements and leaf stage and position. Here we focused on the light-mediated regulation of photoassimilate translocation in plants and the application of light environment control in greenhouse production. We also reviewed the effects of other factors including leaf age and position, air temperature, CO2 concentration and water and mineral element supply on photoassimilate translocation in plants. Finally some perspectives have been proposed.

The division and bending of green and red semiconductor laser light at the same time  [PDF]
Remzi Y?ld?r?m
Natural Science (NS) , 2011, DOI: 10.4236/ns.2011.310114
Abstract: In this experimental study, the laser light was split and bended using a specially designed glass lenses at the same time. This process has been done at the atmospheric pressure and room temperature conditions. During the experiments, the semiconductor laser as a source of green and red laser diode is used. In addition, polari- zation, magnetic field, electric field or any other auxiliary materials and systems which affect laser light are not used to bend the laser light. Only transparent glass lenses that are designed specially are used in the experimental study.
Light Microbeams by Tapered Glass Capillaries for Biological Irradiation  [PDF]
Wei-Guo Jin, Kyohei Katoh, Tatsuya Minowa, Tokihiro Ikeda
Journal of Computer and Communications (JCC) , 2013, DOI: 10.4236/jcc.2013.17002
Abstract: Microbeams of visible light were studied using a tapered glass capillary. Transmittance of laser light through capillaries with different inlet and outlet diameters was measured. About several % of the transmittance was obtained and larger than 80% was achieved in combining with an optical lens. It was found that the obtained transmittance considerably depended on the capillary shape, i.e., the taper angle. Density enhancement of the extracted beam was derived and showed a strong focusing ability for the tapered glass capillary. Propagation of visible light through the capillary was discussed.
Simulation Study of Heliostat-Based Daylighting System for Multi-Story Buildings  [PDF]
Irfan Ullah, Seoyong Shin
Journal of Power and Energy Engineering (JPEE) , 2015, DOI: 10.4236/jpee.2015.34054

The following article has been retracted due to the fact that it cannot be accepted as Duplicate Publication. The Editorial Board takes a very strong respect to the author’s situation on this matter. This paper published in Journal of Power and Energy Engineering Vol.3 No.4, April 2015, has been removed from this site.

RETRACTED: The Validation of a Week-Long Questionnaire against Objective Measures of Light Exposure among a Sample of University Students  [PDF]
Chaojun Fu
Open Journal of Ophthalmology (OJOph) , 2015, DOI: 10.4236/ojoph.2015.52013

Short Retraction Notice

The author of the paper has no right to publish this article under his own and sole name. This article has been retracted to straighten the academic record. In making this decision the Editorial Board follows COPE's Retraction Guidelines. Aim is to promote the circulation of scientific research by offering an ideal research publication platform with due consideration of internationally accepted standards on publication ethics. The Editorial Board would like to extend its sincere apologies for any inconvenience this retraction may have caused.

Editor guiding this retraction: Dr. Pinakin Gunvant Davey (EiC of OJOph)

The full retraction notice in PDF is preceding the original paper, which is marked \"RETRACTED\".

Why the Speed of Light (c) Keeps Constant?  [PDF]
Wei-Xing Xu
Optics and Photonics Journal (OPJ) , 2017, DOI: 10.4236/opj.2017.74006
Abstract: In this paper we demonstrate that the “pure” spacetime and electromagnetic spacetime are bound together. The “pure” spacetime and electromagnetic spacetime all behave as the wave in character and furthermore, both of them change at the same speed. Based on the understanding of the “pure” spacetime and electromagnetic spacetime, we give out the reasonable explanation why the speed of light keeps constant and how the gravity is created among the matters. In addition, some practical applications of the concepts developed in this work are proposed.
Assessment of Stevia rebaudiana Bertoni Genotypes via Morpho-Agronomic Traits under Two Light Conditions  [PDF]
Dhulfiqar Aamer Abdulameer, Mohamad Bin Osman, Zulkefly Sulaiman, Mohd Rafi Yusop, Shamsiah Abdullah, Parisa Azizi, Qusay Abdulhamza Muttaleb
American Journal of Plant Sciences (AJPS) , 2018, DOI: 10.4236/ajps.2018.97102
Abstract: Stevia rebaudiana Bertoni, a non caloric natural sweetner is currently the available substitute to sugar. It is a genus of about 150 species of herbs and shrubs, a compositae and native to Paraguay. However, stevia is a short day plant with almost a constant day length < 12 hours in Malaysia stevia generated to flower early. Therefore, the aim of the study was to investigate the effect of different day length on Stevia rebaudiana genotypes in Malaysia. The experiment was undertaken during December 2016 to April 2017 in the Faculty of Design and Architecture, Universiti Putra Malaysia, Serdang, Selangor, Malaysia. Eight stevia genotypes namely (CHV1, Morita2, MS012, MS012 (4x), SA18, TPU, and hybrids IIUM-F1 and UiTM-H2) were evaluated for the agronomic traits under two conditions: sun light (<12 hours) and simulated light (>14 hours) using a factorial experiment. The agronomic performance of
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