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Hi all,
I have critical question i need to know.
1- for ( CF4) the angle is less than 109.5, then why it is in the 4-pyramid equals to 109.5
2- how "Avogadro constant" was calculated?
3- could any one advise for scientific links in chemistry and science that i could read and post questions...
hi,
i urgently need the help from those experienced about what these tools for?...are they used for metal detector or for gold detector or for what?...i need the help...the tools are attached in the pictures...
all thanks
for urgent reply please you may email me:
time_search@yahoo.com
hi colleagues,
i wanted to have an ellectronic ballast with high power factor for compact flourescent lamp..i was expecting it will be imported with 40w and .18A and .95 power factor.
actually, and here is the point, i discovered after the test in the lab it is only .65 power factor...
can i...
what is the relationship between modualtion index(ma=peak of sine /peak of triangular) and the output voltage when using sinusoidal pulse width modualtion in the inverter(diode clamped inverter); this SPWM is used to drive the transistors in the diode clamped inverter.
i found in my results...
good day... i did built the spwm and it is looking somehow better and after applying spwm on my 3-level d.c.i. cct, it is working better but the thd is not less than 40% which is the case without any type of modualtion..
i did use a modualtion index near 0.8 and a carrier frequeny 2khz. but...
i have sent it to ur email titled "humbly a question" and hope to get ur kind reply..thanks...i didnt know how to attach the image last time..sry...
Mod: Dont reveal other's email id's here
hi all..
attached my unipolar spwm on 3-level diode clamped inverter with 50 hz sinusoidal and amplitude of 1. while triangular frequency 2khz and 0.5 u for pulse width and Tr=Tf=0.24975m and Td=0 and v1=-1 and v2=1.
the output voltage waveform on a pure resistive load attached and i think the...
in 3 level diode clamped inverter i used vpulse modualtor in two different ways and with two output shapes...i need to know which is the better output wave ...the above or the lower shape...thanx
hi all... i am building the SPWM circuit on PSPICE ...i need a help which part or element to choose as Vinput(Vcontrol) to enter to the comparator at the positive side...and what parameters or values( amplitudes) to choose for this Vcontrol signal with frequency=50 HZ...knowing that i built the...
hi...i built the 3-level diode clamped inverter on pspice to study THD...now i am using the vpulse modulator and i am varying the number of pulses ..i put 10,20 and 40 pulses and the THD is only varying with 0.2% from 10 to 40 pulses ...so; i want to know if this is a good result and resonable...
hi all...i have built the 5-level(1-phase) diode clamped inverter circuit on Pspice and i need to convert the same circuiot on Pspice to the three phase 5-level d.c.i....could anybody give an urgent real help to send him the circuit and to teach me the way to convert...thanx
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