I have four block matrices are non-singular, how to show the big matrix that contain all these blocks is also non-singular? what is the reference ?

M1, M2, M3, and M4 are four tri-diagonal non-singular sub-matrices and X is the big matrix that contain M1, M2, M3, and M4. please, i need reference to show the matrix X is also non-singular.

10 November 2017 6,234 6 View

How to write the following nonlinear ODE as a linear ODE by quasilinearization technique? y''(x)=y^3(x)-y(x)y'(x), y(1)=1/2, y(2)=1/3?

03 April 2016 5,335 4 View

Sample dilution for quantitative analysis using ELISA?

If the detection range is in ng/ml but the reference range is in ug/ml for a molecule or protein in serum or plasma .how to dilute and what is the initial volume to be taken for quantitative analysis

02 March 2021 7,670 3 View

How to find the right number of integration points in second order 3d finite elements?

I am familiar with finite element simulations and numerical schemes like the Gauss Legendre quadrature. I also know that the Gauss integration yields exact values for polynomials up to degree 2n-1...

27 February 2021 6,818 3 View

Mediation path analysis - Can I run two seperate models?

I am wanting to run a serial mediation model with 2 x IVs, 2 x MVs, and 3 DPs (all continuous). Is it problematic to run 2 different models for each IV, keeping the MVs and DPs the same in each...

27 February 2021 5,681 3 View

Physical-chemical formation of stalactites/stalagmites. what promotes the formation/growth of these structures?

I know, or think I do, the basic idea behind these natural structures, as from what I know they form due to water dripping from the top leaving a salt deposit behind. But started to wonder about...

22 February 2021 1,400 4 View

Is there a suitable way to confine cell attachment area inside a multi-well plate?

Are there any types of cylindrical cell culture inserts that are designed to confine cell seeding area? Say, if I'm using a 12 well plate (3.5 cm^2/well), but only want to seed cells in the middle...

22 February 2021 7,127 4 View

How can a reference point be fixed to an attachment point in Abaqus?

I am currently trying to copy an assembly feature, that is present in an old version of the model I am using, onto a new model. The feature is a reference point that is fixed to an attachment...

16 February 2021 8,872 2 View

Concentration of DNA?

Hello everyone! Is a normal value 295.8 ug/ul for cDNA? If not what does it mean? Where is the mistake? The measurement was done with nano drop. Thank you!

09 February 2021 6,202 1 View

How to determine the significance of "diagonal" contrasts in two-way ANOVA interactions on SPSS?

Hi all, I'm running a 2 x 2 between-subjects ANOVA with the setup in the attached image (kindly refer to JPG attachment). I understand that calculating simple effects involves determining...

09 February 2021 547 3 View

What is the reference value of THD in BLDC MOTOR speed control ?

i used to control EHO+ANFIS to MRPID to Landsman converter for bldc drive i got 7% but some of them are telling IEEE standards are < 5% is it correct for Drives ?

07 February 2021 5,892 1 View

Whether L version and D version peptidesshould have identical NMR, especially in the state of self-assembly?

Whether L version and D version peptides should have identical NMR, especially in the state of self-assembly have to have identical NMR? How to use HRMS to confirm L version or D version...

01 February 2021 6,756 4 View