Questions related to Daylighting
I'm looking for the best light source to replicate sunlight (or at least decent irradiance across ~300-700nm) that doesn't produce too much heat. Anyone have recommendations?
I am doing research about daylight in homes, and I have 50 filled out questionnaires. The respondents replied on a 7-point ordinal scale how satisfied they were with the amount of daylight in their living room, kitchen and bedroom. Meaning that my dependent variable is at ordinal level. My question is whether I have to regroup the 7 outcome-categories into three groups called "Unsatisfied", "Neutral", and "Satisfied".
As explanatory variables I have
- results from simulations of the daylight via a 3D model. Different daylight metrics.
- age (confounder?)
- gender (confounder?)
I will perform ordinal logistic regression to determine a possible correlation between people's satisfaction and different daylight metrics, so I can answer the question: Which daylight metrics perform better at predicting people's satisfaction with the daylight in their home?
I am not experienced with statistical methods at all, but I have read about the one in ten rule. The lowest outcome I have is that 2 persons rated their satisfaction as "2". Should I group my outcome into three groups in stead of seven?
Can you refer to relevant literature about sample size estimations and minimum number of data in different categories?
I am writing an article on #thedress. I have read that this illusion is partially explained by daylight locus, and I do not fully understand this idea.
I know that it represents the distribution of natural light color spectrum, and that it must be influenced by latitude and season. But I do not fully understand what is represented in the x and y axis of the graphic and how these curves are obtained. Neither have I understood the role that this this concept has in #thedress perception.
1-When we have concret data of illumination measurement , how to calculate the daylight factor in a large architectural space under a sunny clear sky (in summer) , located in a semi-arid region (place for worship)?
2-What is the formula for calculating the indoor lighting measurement point for a large space?
3-Under these conditions, what is the time accepted between the first and the last point IN THE SAME measuring campaign?
About Pilkington TiO2 based self-cleaning glass "Active", Pilkington promo material is explaining:
"It’s worth noting that when self-cleaning glass has been stored in a warehouse for a long period prior to installation, it may take up to seven days to become fully activated. This is because the activation of the glass occurs via a chemical reaction between UV rays from natural daylight, oxygen and the coating. After then, it will continue to work as long as it’s exposed to daylight, even in dull winter weather."
Can somebody explain, why week-long activation is necessary ? Is glass covered in factory with some kind of protective layer or dirt ? Some other ideas ?
Autodesk has discontinued development of the Ecotect software (for environmental analysis) since 2016. What are the best alternatives currently available in your opinion? Especially in the area of insolation and daylighting?
I have an outdoor experiment with 2 species, 5 salinity levels and 2 light treatments (50% and 100% daylight). To produce the light treatments we used shade cloth and for practical reasons we created one large plot with no shade cloth (100%) and another with shade cloth (50%). Within each light treatment each species were combined with all salinity levels and replicated 8 times. To even out random variation from the two light plots, shade cloth and all plants were switch over approximately half way through the experiment (day 36 of toal 90 days). Initially i have analysed the data with a three way anova but i have been told that the nesting is a problem and switching over does account for this. Therefor my statistical analysis is supposedly flawed. To my understanding im not able to conduct an nested analysis as i only have 1 replicate of each light tretament. I was adviced that an GLM is more appropriate due to the design!? Can anyone shed light on why an GLM should be more appropriate? Any alternative analyses?
Please provide references to support your answer and indicate you research field(biology, economics etc...) in you answer.
Thanks in advance :)
In the light of the restrictions placed on people during the Covid-19 pandemic, especially those shielding, how likely is it that old diseases such as scurvy and rickets will return? For those who have been shielding, not everyone has a garden they can go into, diminished fruit and vegetable supply, a lack of natural daylight, etc, will all have an effect, but how significant will that effect be?
Is Solar water desalination Operates on the daylight only? Can it operates after sunset? Can it produce pure water on the midnight for example?
Based on your experiences, how we can increase in the developing countries - like Palestine - the awareness of architects & designers toward the energy used in their design and people in their living spaces? The big problem here is they believe that using the energy efficient solutions and stratigies in their design will increase its cost.
In daylighting calculation, celestial hemisphere is divided with 145 sky segments with a cone opening angle of 10.15° or with continuous plane divisions.
In SVF, the sky seems to be divided neatly with same height. Because of fisheye?
I want to do a thermal inspection of an hot tube distant 8 meters from my camera .
Is there any chance that i can reach out to infrared wavelengths with some IR filters ?
What if i use the Daylight cut filter and remove the infrared cut filter from the camera ?
I have seen some products like FLIR phone converter , that display the thermal image using a phone's camera.
I'm seeking the physical technology behind it somehow if it's possible to realise
MFCs have been a pioneering avenue for taking microbial ability to generate energy from waste and reduce it, given the output has lower yields, will it remain forever confined to R&D labs, or will it ever see the daylight that is commercial applications?
A vision of the future, can see this becoming a way of life, for reducing waste, or some well demonstrated proof of concepts.
According to Wikipedia, PMMA, also known as acrylic or acrylic glass as well as by the trade names Crylux, Plexiglas, Acrylite, Lucite, and Perspex, is a transparent thermoplastic often used in sheet form as a lightweight or shatter-resistant alternative to glass.
Our studies show huge potential for usage of PMMA for daylighting applications in buildings, but it is not easy to collect reliable information about the CO2 emissions or maybe other negative consequences of this material?
I am doing a research about interactive spaces in universities buildings, and I wish to measure this interaction by analyzing several variables that shape the interactive space including: visual connection, thermal comfort, daylight, furniture, circulation.
I wish to do this study by measuring these variable using Grasshopper in Rhino.
The point is that I can measure the environmental variables by ladybug but if I want to measure the non- physical variables, do you recommend any plugin?
I have couple of questions related to measuring visual comfort metrics when you have applied a coating on a glass sample.
We coated some glass samples and then measured the optical characteristics of these glasses in terms of absorbance and transmittance spectra. Also, we already know the u-value and R-value of the base glass without coating layer.
We are planning to study the influence of these coated glasses on users’ visual comfort metrics such as daylight glare probability (DGP) and useful daylight illuminance (UDI) by using DIVA.
1-How can we convert absorbance and transmittance to parameters that Radiance can recognize for daylight simulation?
2-Is there any formula that could convert optical features (such as absorbance and transmittance) to recognizable parameters in DIVA/Radiance? I mean which type of input should we use that software provides us with the UDI and DGP.
Thank you so much in advance for your help.
I am planning to develop an IR thermal camera based surveillance bot to detect human motion in outdoor. However, I am a bit confused that if i apply the same for image processing during daytime and night, will it work for both cases?
Any information regarding this issue will be highly appreciated
I kindly ask you to provide your input on the topic of daylighting and/ or glare analysis. The survey is used for a research project I'm working on. Your email addresses won't be collected.
The survey will take 2 to 3 minutes to complete.
Here is the link to the survey
I really appreciate your help!
I kindly ask you to provide your input on the topic of daylighting and/ or glare analysis. The survey is used for a research project I'm working on. Your email addresses won't be collected.The survey will take 2 to 3 minutes to complete.Here is the link to the survey
I really appreciate your help!
Most humans I know report a "seasonal variation" in sleep patterns that change with "hours of daylight"? What is the mechanism in humans? Do humans and animals share a similar mechanism and pattern?
Anyone know how much should be the level of daylight factor in library? based on a standards.
is it between 1.5 and 5?? and what if it is more then 5 how could I know it will cause glare or no
and DF and the SDA could be calculated monthly and annually or what?
Recently, I have gone through an article in a prestigious journal where most of the figures representing the main theme is manipulated. Do I need to provide any data from my side to claim the fraud?
Please let me know if it fits with your journal and I will send you the abstract to double check. The paper is almost finished.
Plants have developed adaptations for different soil types, methods of pollination, daylight hours, temperature, altitude, competition with other plants. The list is endless, even two plants of the same species, separated by geography will have a different genetic make-up.
Dear friends and colleagues, We are conducting a survey on daylight in residential spaces and would very much appreciate if you had a few minutes to participate and to share it. Thank your very much in advance for your help. Best, Timur
Does anyone know where I could extract via API the number of sunshine hours for the last 15 days (historic daily daylight) ?
I need to test glare and daylighting conditions in a model that is about 3x3m and 1m high . Unfortunately my university doesn't have an artificial sun, is there other alternative methods? or does anyone know if I there are private labs that have artificial sun around Houston, Texas, or even anywhere in the US that I can use for few days?
it was found that a soap solution fil with an unknown constant thickness reflects the daylight and the resulting reflection is blue with a wavelength of 475 nm. T he refractive index of the soap is 1.4. What is the thickness of the film?
during the synthesis of photocatalysts, photocatalysts were dried, filtered, washed, in that process it will be exposed to the light (daylight, the light of electric lamps in households), What effect does this have on our catalyst?
Thank you very much for helping! I'm studying about this topic, and i will do it when i study a master's degree, now I am about to graduate from a university.
I would like to know how much light is needed for desert , grasslands, woodland and subalpine species in climate room. I am planning for 3*3 meter climatic room for ecophysiological purposes. Normally we use florescence light and we can use LED as well. We have air and moisture conditioning in the room.
Because for obtaining high Lux values we will face problem of high temperature and in other side, for low Lux values we will have problem in light.
Do you have any suggestion for amount of Lux or PPF?
All the best,
I am taking ultraviolet photos of flowers, after having had a Full Spectrum Conversion to the camera. The Conversion was professionally done; the company removed a filter that blocked both UV and IR. To take UV photos of flowers I am adding to the front of a camera a UV pass filter, excluding both visible and IR. I am not sure if it matters how I set the White Balance in the camera. I can use trials to see how the appearance of the photos varies with different White Balance settings, but if anyone has experience with this, please don't hesitate to make a suggestion as to how to set the White Balance in a digital SLR for UV photos. Thank you
How can we reduce the length of stay of patients through these 2 factors? Patients can be classified under any category but mostly "long stay patients" and their benefits.