Clearing blocked nanoViper liquid chromatography tubing?

Does anyone have any tips on clearing blocked nanoViper (20 uM ID) tubing in a Dionex 3000 for LC-MS/MS? We're having recurring high pressure errors in our loading pump, and we've isolated it to a...

28 July 2020 3,562 3 View

What plotting software allows direct selection of data points from a graph?

I have been using Aabel (Gigawhiz) plotting and statistical software. However, it is Mac OS centric and cannot be installed on a PC. I like this software because it enables me to directly select a...

19 June 2020 3,388 4 View

How does one find constants of the motion for a chaotic flow?

I'm reviewing a lot of papers where the authors take a 3-D autonomous chaotic system (think Lorenz) and add a fourth variable bidirectionally coupled to the other three and then report its unusual...

04 May 2020 3,785 33 View

What is the best method for unsupervised classification of large and multidimensional raster data sets?

We are attempting to generate a landscape classification of a large area using remote sensing data with a 20 x 20 m cell size and an area of 200,000 km2. We have 8 different rasters and want to...

12 February 2020 4,443 4 View

Hierarchical clustering of multiple raster images - is there an R script?

I'm working with a significant number of rasters (.tiff) as part of a landscape classification exercise. First I want to generate a dendrogram from the rasters (maximum of 7 different rasters) to...

25 January 2020 7,327 3 View

Does anybody know an open Matlab code for Facial Expression Recognition with Convolutional Neural Networks (CNN)?

Does anybody know an open Matlab code for Facial Expression Recognition with Convolutional Neural Networks (CNN)?

26 September 2019 1,555 1 View

Is it possible to weight the significance given to a raster during K-means or equivalent classification of raster imagery?

We are using multiple raster layers to produce a predictive classification of the landscape. Statistical modelling indicates that some of the layers we are using for the classification are more...

30 January 2019 5,061 1 View

Pls i need journal articles on rice grading machine?

effect of feed gate opening on the performance efficiency

15 August 2018 9,215 3 View

Troubleshooting ESI LC MS/MS chromatograms--sample contamination?

We are having problems with an ESI LC MS/MS proteomics experiment that are difficult to pin down. Samples were prepared in batches over the course of a week, the first batches worked very well but...

12 July 2016 9,311 10 View

Why do some soils develop poor drainage?

Soils vary in their drainage status. Soil drainage status is a key control over redox and hydrological response. Can anyone explain why some soils evolve towards being poorly drained and others...

01 January 1970 7,673 8 View

Which transition metal salt precursor is best for doping? Why?

I would like to synthesize a transition metal doped TiO2 via solgel method. Hence, I would like to know which metal salt precursor to choose among Chloride, Nitrate, and Sulphate. A clear...

27 February 2021 4,285 3 View

What reaction will occur when adding hexamine into ammonium nitrate in an acidic medium?

Hello, I am investigating properties of water in oil emulsion explosives. And adding hexamine (hexamethylenetetramine) into one of the phases that are used to make the emulsion should increase the...

21 February 2021 8,680 1 View

Are there alternatives to the Devarda alloy when estimating nitrogen?

Are there alternatives to the Devarda alloy when estimating nitrogen? devarda alloy is reducing the nitrate to ammonium

15 February 2021 8,838 3 View

References for relative humidity created by salt solutions at different temperatures?

I understand that the ability of standard salt solutions commonly used to produce a certain relative humidity (RH) in a closed space changes somewhat with the temperature. Where do I find data...

04 February 2021 7,370 4 View

Why I do not get blue color in nitrate test of water repeatedly?

Previously, I have tried testing of nitrate in water. Sometimes I got intense blue color. However this procedure is not repeatable. It is highlighted that when I prepared diphenylamine in sulfuric...

26 January 2021 4,803 1 View

How can I prepare 300mg/L concentration of lead(II) nitrate ( Mol. Wt reffered is 331.21) incoorporated Luria-Bertani (LB) agar ?

I need to check the Heavy metal (lead) consumption assay using microbes at varying concentration in same media. ( 200mg/L to 2000mg/L).kindly help me to clear it.

19 January 2021 1,946 9 View

Why does COD increase over time when external carbon sources are added in the denitrification process in waste water?

Why does COD increase over time when external carbon sources are added in the denitrification process in waste water? After 1 hour, the concentration increased from 30mg/l to 40mg/l after 20...

17 January 2021 374 9 View

Which LCIA method is most suitable for assessing the impacts of nitrate leaching in groundwater (eutrophication )?

The eutrophication of groundwater by nitrate leaching is major environmental problem in Germany, especially in areas with intensive agriculture and high N-fertilizer inputs. In addition there are...

16 January 2021 5,182 7 View

Please share some research papers on the synthesis of Mn3O4 nanoparticles via Hydrothermal method by using Manganese(II) nitrate hydrate?

05 January 2021 9,040 4 View

Nitrate , nitrite , ammonium test can be alternative of total nitrogen ?

I have ion chromatgrahy by which different type of cation and anion can be determined . kjeldal nitrogen arrangement is also available but it is not convenient to me rather than ion...

10 December 2020 1,083 5 View