How to start with Principal Component Analysis?

I want to carry out PCA on a set of chemical data, some of them in oxide form and some in elemental form. The oxides are in percentage and the elements are in ppm. I have understood that, the...

14 December 2020 2,201 7 View

PCR inhibitor: Isopropyl acetate (2.5%)?

If extracted viral RNA contains 2.5% isopropyl acetate, would it be acting as PCR inhibitor?

20 October 2020 3,058 3 View

Can anyone share publication of Seck HA (1971a, b)?

24 August 2020 2,575 2 View

Interpretation of EPMA data of Albite and K-feldspar?

I have some EPMA mineral chemistry data of albite and K-feldspar which are formed by metasomatic process. The analyses were done at 15keV/10nA with 1-2micron beam. 1. What are the various plots...

17 December 2019 3,392 3 View

Is there any computer program/excel calculation sheet for Sulphide geothermometry and geobarometry?

I have used a program ILMAT, an excel sheet for ilmenite/magnetite geothermometry. Is there a similar program for sulphide minerals? And also for chlorites?

01 March 2019 7,298 1 View

Does all mineral oil contains asphaltenes?

I had a mineral oil of 460cSt (containing sulphur and phosphorus), after addition of nanparticles (carbon nano tubes and graphene) the viscosity decreased significantly. literatures says that the...

16 August 2018 6,476 1 View

Which is more preferable mixed lubrication regime or boundary lubrication regime?

04 July 2016 1,862 6 View

How does Young's modulus,shear modulus,Poisson ratio of a nano wire/tube/particle influence the coefficient of friction?

Mechanical properties influencing coefficnet of friction.

21 June 2016 1,344 2 View

Can we get lower coefficient of friction with larger scar diameter in a Four Ball Test rig?

Two tests were carried out. One with a vegetable oil and the other with mineral oil. The mineral oil viscosity was almost twice than the vegetable oil. It was observed that the Coefficient of...

10 January 2016 8,250 6 View

I performed an experiment and the following were negative outputs in the response table. Why?

An L9 orthogonal DOE was performed using Minitab. The S/N in case of frictional force is negative.The response of the frictional force and rpm were negative. But in case of other output...

10 July 2015 6,731 5 View

What acid can be used to dissolve limestone to extract microfossils?

I am trying to extract possible Loriciferans from mudstone, attempts with acetic acid (15%) and chloridric acid (37%) have failed to dissolve the rock, would a higher concentration (50%) of HCl...

17 December 2020 5,897 7 View

How did these marble-like limestone stones formed?

There is a small section of a beach south of Tiros, Greece where most of the gravel is made up of these marble-like stones. While I was there suddenly several waves came ashore, but the sea was...

26 October 2020 5,797 4 View

How to select pixels by color in ImageJ?

I want to use ImageJ for counting my different tephra populations in a thin section sample, but I am not able to separate the lighter populations from the darker ones in ImageJ before counting. I...

28 September 2020 5,471 2 View

Any suggestions to address a specimen advance problem on a Leica UC6 Ultramicrotome?

My lab is having a problem preparing thin plastic sections (70 nm thick) for standard Transmission Electron Microscopy. We are using a Leica UC6 ultramicrotome. The samples are of brain and...

15 September 2020 9,982 3 View

Anybody can determine this micro-fossil?

Dear Researchers, I found it from Permian limestone strata in Julfa province (North-West of the Iran country). It should be mentioned, this microfossil extracted from samples collected of the...

29 March 2020 574 5 View

Can somebody help me and recommend publications for extracting Radiolarian microfossils from the Middle to Upper Permian strata?

Dear researchers, I'll be grateful if it is possible to recommend any method papers for extracting Radiolarian microfossils from the Middle to Upper Permian. Sincerely yours, Soheil.

22 March 2020 5,895 4 View

Can you recommend publications that might be helpful in my attempt to interpret these thin sections?

16 February 2020 2,789 2 View

Can anyone suggest what is this microscopic fossil extracted from Middle to Upper Permian limestone strata?

Dear Researchers, I found it from Middle to Upper Permian limestone strata in Julfa NW Iran country. This microfossil extracted form sequences that belong to the Stratigraphy and bio-event...

16 February 2020 3,088 10 View

Is there a working protocol for microtomy of Vigna radiata root samples?

A simple and cost-effective protocol for sectioning of Vigna radiata root samples.

02 February 2020 786 1 View

What kind of fossil algae is this?

Hi everybody. I found this in a thin section of an oncolitic limestone that belong to late Jurassic - early Cretaceous period (Tithonian-Valanginian). im a begginer in this matters but my first...

01 February 2020 6,783 3 View