in order to study the effect of light quality and quantity on morphological and physiological characteristics of two late and early maize (zea maize l.) s.c., an experiment was conducted in greenhouse conditions, ferdowsi university of mashhad, iran, during 2008. the experiment was carried out factorial based on randomized complete block design with six treatments and three replications. differ...

in addition to attention to natural light as a renewable, costless and environment-friendly source of energy in the late 20th century, numerous studies have been conducted into the effect of natural light on human being’s soul and body and all such studies reiterate the undeniable role of natural lighting on people’s behavior, attitudes, and efficiency. however, in spite of the awareness of the...

Observational evidence suggests that better ambient lighting leads people to feel safer when spending time outdoors in their community. We subject this finding greater scrutiny and elaborate on the extent which improvements street affect routine activities during nighttime hours. report from a survey experiment examines individuals’ perceptions of safety under two different intensities lighting...

i Abstract Nowadays, with increasing concern on environmental protection, energy crisis, and quality of life, in the context of the lighting industry, Solid-state Lighting (SSL) is considered as the next generation green lighting source, following the conventional lighting sources (like incandescent bulbs and fluorescent lamps). As a type of SSL, High Power White Light-emitting diodes (HPWLEDs)...

This study aims to investigate how lighting design can be used as an environmental design feature within historic sites in cities to turn a space into a place through placemaking processes. Accordingly, the research question is: What artificial lighting design aspects need to be taken into account in historic sites within cities through a placemaking process? Naghshe-Jahan Square’s in Isfahan, ...

Face recognition in photographic positive and negative was examined in a same/different matching task in five lighting direction conditions using untextured 3-D laser-scanned faces. The lighting directions were +60, +30, 0, -30 and -60 degrees, where negative values represent bottom lighting and positive values represent top lighting. Recognition performance was better for faces in positive tha...

Illumination variation is one of intractable yet crucial problems in face recognition and many lighting normalization approaches have been proposed in the past decades. Nevertheless, most of them preprocess all the face images in the same way thus without considering the specific lighting in each face image. In this paper, we propose a lighting aware preprocessing (LAP) method, which performs a...

LED lighting can provide pleasant temporal dynamics, though the understanding of what constitutes pleasant has so far remained largely in the experiential domain of lighting designers. Only recently has research begun to uncover what affects preferences for dynamic lighting. Based on the insight that visible, yet subtle, dynamic lighting is desirable, an experiment was conducted which studied t...

Automatic lighting design aims to provide users with semi-automated approaches, and easy-to-use tools, to configure lighting for 3D scenes. We present LIGHTOPEX the first fully automatic example-based local illumination lighting design system. Utilizing a wavelet-based lighting design framework, by which image quality is modeled using a cognitively inspired objective function, this approach to ...

White light-emitting diode (WLED) lighting systems have recently attained levels of effi cien-cy and cost that allow them to compete with fl uo-rescent lighting for off-grid applications in the developing world, where about 1.6 billion people still lack access to the electricity grid. Additional attributes (lower cost, compactness, ruggedness, and service life) make WLED systems potentially sup...