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09/01/2026
posted in Communications & Electronics
by ZIVEN WU
How to Source Obsolete and Hard-to-Find Electronic Components?
In the electronics industry, sourcing obsolete, discontinued, or hard-to-find componen...
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08/25/2026
posted in Instrumentation
by lili
Hello CR4 Community,
In modern industrial processes, we heavily rely on high-precision instruments (such as flow meters, pressure transmitters, and t...
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08/20/2026
posted in Instrumentation
by lili
Electromagnetic vs ultrasonic flowmeters is a common comparison when selecting a flow measurement technology for industrial liquid applications. Both...
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08/19/2026
posted in Electrical Engineering
by Anonymous Poster
Been chasing this one for two days and need a sanity check.
Customer's αiSV 40/40 (A06B-6117-H105) throws SP1241 on spindle acceleration. Rando...
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08/18/2026
posted in Sustainable Engineering
by hydroflux
Every day, homes, apartments, offices, hotels, schools and commercial buildings generate wastewater. It comes from toilets, bathrooms, kitchens, washi...
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08/14/2026
posted in Electrical Engineering
by Anonymous Poster
The specification says, " LV Switchgear Bus bar temperature rise shall not exceed 45°C under rated current".
The ambient temperature is around 45...
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08/12/2026
posted in General Discussion
by Evelyn Li
Sharing a technical application on converting high-moisture industrial solid waste (ceramic residues, soil spoil, and waste gypsum) into high-strength...
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08/12/2026
posted in Manufacturing
by Rachana3
Copper nickel flanges are durable piping components made from a copper-nickel alloy, offering excellent resistance to corrosion, seawater, and high te...
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08/12/2026
posted in Manufacturing
by Radhika Solanki
450 BHN plates are a strong choice for heavy-duty applications where high wear resistance, impact strength, and durability are essential. They are com...
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08/31/2026
posted in Challenge Questions
How many lines are there in these pictures? Explain the phenomenon depicted. (Apologies for the freehand Sharpie!)
Figure 1
Figure 2
08/31/2026
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07/31/2026
posted in Challenge Questions
Use the three white pieces to place the black king (e5) in checkmate.
* You do not need to simulate moves to arrive here.
* Abide standard chess pi...
07/31/2026
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06/30/2026
posted in Challenge Questions
Your friend makes a $250 bet with you.
He will pick a number between 1 and 1,000. If you can guess this number in 10 or less questions or guesses, yo...
06/30/2026
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