Anyone that knows about methods of identifying multi-modality of samples of distributions? Or methods of estimating number of modes?

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Running resistanve of a heavy duty truck/vehicle/lorry?

It is possible to find data regarding the running resistance of a heavy duty truck?

06 July 2018 9,707 0 View

Can someone clear out this contradiction regarding ab-dq transformation and their angular relation?

Hi, In the book "Power system dynamics: stability and control" by Jan Machowski, Janusz W. Bialek, and James R. Bumby, on page 117-118, in equations (3.166)-(3.167) and in figure 3.36, the...

06 July 2018 3,138 20 View

Modeling approaches when the QSS/DAE approach is not accurate enough?

Hi, I'm looking for modeling approaches when the QSS/DAE approaches are not accurate enough in power system dynamics. For example when both "slower" dynamics as machine transients x' are...

01 February 2018 4,127 6 View

Is anyone considering why people talk so little about solar power with mirrors and steam turbines nowadays?

Is anyone considering why people talk so little about solar power with mirrors and steam turbines nowadays? Such solutions should give more opportunity for load control, frequency response, etc....

31 December 2017 7,426 5 View

Is there an adjective related to "impedance" as "resistive" is related to "resistance"?

31 December 2016 4,780 0 View

Alternative to Edgeworth series expansion?

I have read that a drawback with Edgeworth series expansion is that "... they can be inaccurate, especially in the tails, due to mainly two reasons: (1) They are obtained under a Taylor series...

09 October 2016 6,338 3 View

Where is it possible to buy single-phase AC synchronous motors for lab purposes?

02 March 2016 5,245 7 View

Can someone help with Polynomial matrix equations?

Hi, I'm getting old and I'm not sure whether or not I've learnt any theories about solving polynomial matrix exiations, like the second order equation XTAX+BX+C=0. Can anyone fresh my mind up or...

07 August 2015 216 3 View

How to compare two groups with only two measurements?

Hiiiii everyone! I have an enquiry on statistical analysis. I was looking for many forum and it's still cannot solve my problem. I want to compare means of two groups of data but only with two...

03 March 2021 8,796 3 View

Could you recommend any books about Number Theory?

Beginner level books. High level books. Analytical Number Theory. Algebraic Number Theory. Combinatorical Number Theory. Books about partitions. Books about primes.

03 March 2021 7,174 5 View

Can we classify HV and LV lines based on line length?

I have dataset which shows the length of power lines. I need to classify the lines based on the line length. Is there a rule to classify the High voltage (HV) and low voltage (LV) lines based on...

03 March 2021 4,116 4 View

What kind of fluid could I use for a pitfall trap that also does not invalidate molecular testing?

Hi, I want to start testing pitfall trap to obtain ants samples, but I need to conduct molecular analysis on those insects. So, what kind of fluid can I use? Ethanol expires too early and I need...

03 March 2021 5,978 5 View

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10?

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10? Since, the growth curve from day 2 to 10 won't be like the "Logistic curve" it might not follow logistic...

03 March 2021 1,401 3 View

Arena simulation - how do i model the following model in ARENA (see description) (new to ARENA)?

Hello, I'm fairly new to ARENA and I have the following problem: I have two queues in which, in each queue, a different order type arrives (both having an arrival rate of exponential 10). Order...

02 March 2021 2,431 3 View

Would fecal samples stored at -20C for over a year impact metagenomic analysis?

Dear All, I have access to some rodent fecal samples that have been stored at -20C instead of -80C. Anyone have experience with the impact of stowage condition on comparative metagenomic analysis...

01 March 2021 2,512 1 View

What test should I use to compare two or three means, if data is not normally distributed but sample size is > 30 in each group?

I personally feel this as a most confusing question. As per my understanding, if sample size is > 30, and sample is skewed, we can still use paramteric approach, as it will follow Z...

01 March 2021 1,587 6 View

Distribution of particles in metal matrix?

How would define the "good" and "poor" distribution of particles within the matrix. Is there a quantitative solution to assess the distribution of the particles, which then having denotation of...

28 February 2021 7,397 8 View

Is there a deep reason for using the squared modulus of the wave function as the probability density of the existence of the particle?

I think we were all surprised at the first time we got to know quantum mechanics that the squared modulus of the wave function is the probability density of the existence of the particle? The role...

28 February 2021 6,282 9 View