Waqar Azeem Jadoon

6 Questions 4 Answers 0 Followers

Questions related from Waqar Azeem Jadoon

Is there an R package available for US EPA's Positive Matrix Factorization (PMF)?

Dear All, Greetings. I want to use the US EPA's Positive Matrix Factorization (PMF) technique with R language. However, I couldn't find the PMF package on the CRAN webpage. Although Non-negative...

01 August 2024 9,941 1 View

Help need on box plot in R?

I am using the following code to generate boxplots, provided with log y-axis, however, want the values on y-axis as 0.1, 1, 10, 100 etc. But I get plot with 0.1, 1, 10, 100 values overlapped with...

15 August 2023 1,707 0 View

How do I solve the air leak problem on Agilent GC/MS during manual tuning?

I am encountering the air leak problem during manual tuning. I have checked for all possible leaks and took measures accordingly. However, I am still facing the problem and my machine shows the...

20 October 2015 9,355 4 View

How to calculate specie specific uncertainty in PMF for PAHs?

Dear all, I am struggling to calculate the specie specific uncertainty for Polycyclic Aromatic Hydrocarbons in Positive Matrix Factorization version 5. I was reading the guide however, could not...

07 April 2015 3,124 2 View

Can someone advise on the ways to solve the issue of changed (decreased) abundance value for PAHs using GC/MS?

Hi all, hope everyone will be fine. I have two questions to ask as follows: 1) I dont know why the abundance value vs time of my GC/MS has decreased about two-fold from the previous values as I...

03 July 2013 5,721 2 View

C?

06 November 2012 1,484 2 View