The phrase "which is observed" is correct and usable in written English.
You can use it when you want to introduce a fact that you have observed or noticed. For example: The flowers, which is observed in late spring, were a beautiful sight.
Even I notice this, but most things pass me by, which is observed with increasing frequency and mild incredulity.
"Hotel Rwanda" radically downplays the actual gore, which is observed either through a fog or from a distance.
"There is a culture of intentional forgetting, purposeful forgetting, which is observed by both black people and white people," he said.
Meeting with the Maharaja & the Maharani (the American Hope Cooke) & participation in the celebration of the Tibetan New Year, which is observed by Sikkim.
Because of Veterans Day, which is observed today, alternate-side street-cleaning regulations will be suspended in New York City today.
This year for the holiday, which is observed on Sunday, Petrossian Cafe and Boutique, 911 Seventh Avenue (58th Street), is selling kulich for $12 and paskha for $20212 245-2217217.
The parade, much smaller than similar commemorations in the Soviet period but laden with significance and mixed messages, marked the 63rd anniversary of the victory over Nazi Germany, which is observed in Russia as Victory Day, a solemn state holiday.
When a constant current is applied to an LED light bulb a constant stream of photons are emitted from the bulb which is observed as visible light.
Performance evaluation indicates that DIKernel imposes negligible overhead which is observed by cycle level microbenchmark.
One such adaptation is the buoyancy of eggs, which is observed as density changes during development.
In this case the amount of CNFs is very low, which is observed from SEM analysis.
