milesmiles902

Bump

@TheClark the only question I would have is for @EMeyer

Does this detect the whole visible spectrum or select wavelengths?

I believe for LEDs you should find a spectrometer that scans/detects the entire spectrum at once to get a good profile of the LED, which I imagine you want it for and not specific wavelengths.

47 minutes ago, LadAShark said:

Certain spectrophotometers could, but I believe the one in question here is one designed to test absorbance spectrum (aka what does so and so substance absorb?) as opposed to emission.

At least physically speaking, the spectrophotometer in question uses cuvettes that you need to insert into the machine, so I don’t believe you would be able to test an LED with it.

I’m sure if you were very determined though, you could get it to work haha.

You're right. He could do something fancy, such as not have the lamp on (cover the entrance with card stock) and shine the LED into the detector above the cuvette. If the detector becomes over-saturated with light, then hold the LEDs farther away. It probably would work with water in the cuvette. The LEDs have a sharp emission around limited wavelengths that water shouldn't absorb. Then, as stated earlier, can also be used for testing water samples.

All you need is the detector to do what you are saying. The tungsten-lamp is used to specify and emit wavelengths for wide-spectrums, similar to the LEDs, except LEDs are commonly a sharp spectrum for small-detection. I bet it would work with some straight-forward and non-destructive finagling. 

As said, the problem is emission vs absorption detecting. Adafruit has some wavelength and rgb value detectors, which can also be used for the emission and likely LEDs: https://www.adafruit.com/category/61

At a concentration of zero, what should be the absorbance? That's all that needs to be said.

Happy 4th of July! Eat a steak for America!

In my experience of being a PhD graduate student in physical chemistry, also publishing and specifically studying spectroscopy across many different types of the electromagnetic spectrum, along with how this equation was derived. 

Theory is what made good practice and good practice comes from accepting theory. 

Concentration within a solution is a linear process and because your dilutions or solution making was not accurate in all experiments to the significant figures specified. You either can't trust your data or have to add a standard deviation bar to your plot, which is the only way to accept this data. 

The standards across many fields have become lenient, but coming from the field of chemistry that defined and made this equation. 

It is required to either re-make your stock-solutions or make the y-intercept zero. We also teach this in general chemistry with similar spectrophotometers. 

I am positive that in the field of environmental chemistry, which is what you are achieving. They will do the same.

The difference between our arguments is accuracy, which is cool.

I love your work. Keep it up! I wish I had a spectrophotometer to do similar work.

Actually, @pdxmonkeyboy

Be honest. Did you take this picture? 

Just to be careful on the quality of your data.

Beer-Lambert's Equation does not have a y-intercept. 

You should always fix it to 0 in Excel. 

The form is y=mx where y=A, m=epsilon*l and x=c. Epsilon is the slope because your cuvettes have a width of 1 cm.

On the low-level concentrations a y-intercept of non-zero, will demonstrate a deviation from the real concentration, which is the most common areas of measurement in aquariums.

Keep up the cool experiments, but be careful on your data. A b-value of -0.02 could represent 10-20% deviation on a concentration below 0.25 ppm.

16 hours ago, pdxmonkeyboy said:

I'll let this one slide @pdxmonkeyboy

It is qualified to be a coral and a plate.

What's the stock model on that spectrophotometer?

Here are the rules:

Plate Corals.

Deadline:

August 1st, 11:59 pm

Please vote once! 

Voting Closes:

July 7th @ 11:59 pm

Pro

It depends on how much time you have. 

Safer is better and honestly, the easiest way is to break the rock. 

12 hours ago, LadAShark said:

 

It’s also badly coined. Harem was attributed to polygamy when in fact it was a matter of secluding/sheltering/protecting women from stranger men. Still not a nice thing but not done will ill intent. By the original definition, a “harem of clownfish” makes no sense.

Here’s the wikipedia article on it, which I’ve found to be fairly well written and sourced: https://en.m.wikipedia.org/wiki/Harem

And some of the more important excerpts of said article:

“Harem (Arabic: حريم‎ ḥarīm, "a sacred inviolable place; harem; female members of the family")”

“A harem may house a man's wife — or wives and concubines, as in royal harems of the past — their pre-pubescent male children, unmarried daughters, female domestic workers, and other unmarried female relatives.”

“In the West, Orientalist imaginary conceptions of the harem as a hidden world of sexual subjugation where numerous women lounged in suggestive poses have influenced many paintings, stage productions, films and literary works.Some earlier European Renaissance paintings dating to the 16th century portray the women of the Ottoman harem as individuals of status and political significance. In many periods of Islamic history, women in the harem exercised various degrees of political power,  such as the Sultanate of Women in the Ottoman Empire.”

”Where historical evidence is available, it indicates that the harem was much more likely to be monogamous. For example, in late Ottoman Istanbul, only 2.29 percent of married men were polygynous, with the average number of wives being 2.08. In some regions, like Sub-Saharan Africa and Southeast Asia, prevalence of women in agricultural work leads to wider practice of polygyny, but makes seclusion impractical. In contrast, in Eurasian and North African rural communities that rely on male-dominated plough farming, seclusion is economically possible but polygyny is undesirable. This indicates that the fundamental characteristic of the harem is seclusion of women rather than polygyny.”

To clarify this above quote, the source indicated that the average of 2.08 was of the 2.29% that had multiple wives, not of the whole population. So 2.29% of the population had approximately 2 wives, with a handful having more. Just to make sure nobody misunderstands this as the overall average being 2.08. That misunderstanding would mean that that 2.29% of the population had 48 wives on average for each man 😳😅. Q

 

Anyway. To sum it up, the coinage of the term “harem,” meaning what it does at present, was partially an orientalist renaissance fantasy and partially a form of disinformation if not outright propaganda, but I’d personally like to hope it was just a misunderstanding. However, I’m not sure how else Taylor could have phrased this, because that is unfortunately the zoological terminology as milesmiles indicated.

 

I’m not sure if it’s against the rules to post this since it’s somewhat historical and political, while also being sliiiightly off topic, but I felt it’s always good to be well informed!

The Ottoman empire lasted 1292-1922. Up till the 1700's, it was a completely different world than the 2.08 stat you listed. Also, there was a lot of slavery involved. 

On 6/24/2019 at 4:20 AM, TaylorW said:

So I've been considering turning my "Anenome" tank into a Clown Harem Tank, I've done quite a bit of research or at least researched what I can find, but I'm curious if anyone here has had success longer term with a Harem tank. From what I can find many consider them to be one of the "easier" tanks since it's mainly bta's, correct lighting, water change schedule and a regular feeding schedule for the Clowns? I've always had excellent luck with bta's so not worried there. The tank I'm considering is my 50 gallon acrylic, it will be stocked with mostly Bubble tips all colors. I'm having trouble deciding how many Clowns though for that size tank. I'm leaning towards the lower recommended numbers of 7-15 but not sure what would be a good number for a 50? I have a 20 long sump with Hydor Performer 705 Recirculating Skimmer (huge Skimmer meant for up to 300 gallons, am trying to trade for something smaller) just recently started a DIY algae scrubber and am currently using filter socks for filtration. Any tips and or criticism welcomed! Oh and am wondering about having other species of fish with them, I know they can get aggressive at breeding age but I have seen videos and pictures of Harem tanks with other fish like a Cardinal, Mandarin and a Scooter Blenny mixed in some.... It's probably not the best idea especially once they reach breeding age but still curious! I appreciate any tips at all 😊 

How's the tank going?

https://www.gazettetimes.com/news/local/newly-discovered-fish-named-for-osu-scientist/article_f9c7374e-8dbc-54e9-b89a-fa860d507594.html

14 hours ago, albertareef said:

Hey - I tried to get Kim and Holly back on board but I don't think they have recovered from their last run 😀

It's a rough road. It puts a lot of stress on you. It gives you wrinkles, adds 25 years to photos and 5 years to real-life. At that point, age just becomes a number and there's no benefit from it, except being a bit closer to social security and retirement.

It also allows you to look back and say I helped the world for a portion of my life.

50 minutes ago, TaylorW said:

Yeah I did see the series BRS did, and that they recommend getting them young and from the same clutch. Curious why you can't use the H word? Am I missing something?? That's what a group of Clowns is called everywhere I've researched, didn't mean to offend obviously if I did....

 

Sent from my BLU R1 HD using Tapatalk

Maybe you're right. I just feel it has bad connotations. I didn't report you to the forum gods.

Apparently, Wikipedia says this is common for many groups of animals.

https://en.wikipedia.org/wiki/Harem_(zoology)

I just wish it was different. It has a bad rep in human history, especially with certain religions, but it is the correct word. 

I hope your clownish breeding works out well. I was never successful.

I respect @Flashy Fins for being the only woman to stand-up against these men. 

Congratulations to all of you. @Flashy Fins stay strong.

Please don't call them a Harem on this forum.

I don't think they preferred to be called geriatrics. 

Bump

I can't see the colors, but the structure looks like a tri-color acropora: https://bit.ly/2IwUP8t

This is the best post I've seen from most in a while.

1. It takes week to cycle a tank
2. Larger water changes, less often are better
3. Fish only grow till the size of the tank
4. You need to siphon the sand

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