Hello!! It's Joseph

excellent data table from Kanthal handbook Kanthal A ( 0Cr25Al5 or equivalent) from TB:   Nichrome wire Ni80Cr20 ( Nikrothal 80) in metric. list of other common alloy spec from TB:  from alloywire , there is a very handy spreadsheet 1. first of all, determine the type of heater wire to use ( Nichrome or 0Cr25Al5) 2. from datasheet, determine resistivity online resistivity convertor 3. from your design, determine resultant power to achieve and applied voltage  the spreadsheet will recommend the surface load ( depending on your application)

 CEM 25-P was discontinued in late 2020, and is replaced by CEM 26. basically the major mechanical parts are the same.  on CEM 26, the worm wheel, shaft and bearing are the same as in CEM-25P. The period error is still < +/- 10 arc sec the payload is basically the same 12 kg ( 12.3 kg on CEM-25P) The major difference is the built-in Wi-Fi for connecting to apps. （Star Fi is a USD 50 ) Well the built-in GPS is now removed The maximum slew speed is now faster, at 6 degrees per second ( vs 4 on CEM25p) Another difference is the DEC and RA bearing clutch, which was done by using 2 knobs in CEM25p, now you unlock the bearing by a single switch ( same as in CEM 40 and CEM70)  The hand controller is updated to 8049 ( which has a serial port at bottom for firmware upgrade, and computer control, same as in CEM25p) iPolar scope is still an option. There is now a place holder on the side of dovetail saddle, which is for  the mini guiding scope  iGuider 1  which is ...

 aflatoxin  how to detect? chemical paper test strip  UV  The aflatoxins all have absorption maxima around 360nm with a molar absorptivity of about 20,000: the B toxins are named for their blue fluorescence (425nm) and the G toxins for their green-blue fluorescence (450nm). The B1 toxin is the most common, flowed by B2 toxin, while the G toxins are fairly rare. The fluorescence sensitivity of the G toxins is more than 10 times greater than that for the B toxins. The minimum detectable level is about 100 pgrams for the G toxins and 1 ngram for the B toxins Cfs

 是日文鐘的一種, 2400~1900 BC 建造 (堯國)    The slits is said to be only 1 degree in width. So it will not be possible to adjust for axial precession 歲差   if my calculation is correct the day of solstice will move 1 degree in 67 years. due to change of "obliquity of ecliptic( 黃赤交角)" the position of sun is moved by ~0.5 degree 4000 years ago. Then the slits will not should still fall in line with the solstice and equinox dates. springer kaogu sociostudies obliquity of ecliptic archaeoastronomy

 some simple illustration: raw images:

  traditional mud and straw method to keep fresh for 6 months. without fridge can this be used for coffee fermentation?

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