Can someone provide me ASTM C133 standard?

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Unit for GHG emission rate?

In most of the literature I am reading at the moment, the abbreviation μg m−2 h−1 is used to express mean annual fluxes of greenhouse gases. I am confused by the "h" and supposed it stands for...

27 June 2024 9,633 1 View

Thermal conductivity of edible oils, a good qualitiy indicator?

Dear all, I'd like to know if the thermal conductivity of different edible vegetable oils could serve as an additional quality parameter (units: (Cal/cm s °C)). I'm comparing olive oil, african...

13 April 2024 2,334 0 View

Restart Analysis in ANSYS APDL?

I want to restart the calculation from a defined sub-step within a do-loop. And I get the following warning: *** WARNING *** CP = 226.328 TIME= 13:25:17 Restart for...

10 October 2023 7,511 0 View

How to monitor illegal irrigation operations through Google Earth Engine?

Dear all, I work for a big irrigation district. It seems that some farmers are illegally using irrigation water from the main canals at night which is prohibited. The crop areas are around 5-20 ha...

19 September 2023 6,119 6 View

Why is there a difference of 1Da in calculated vs experimental mass spectrum?

Hello, I'm working with highly charged supramolecular systems and there is a discrepancy of one unit between my experimental and calculated data. I'm using ChemCalc to calculate the mass spectrum...

07 June 2023 7,815 0 View

Is there any standard to perform landform classification?

Is there any standard to perform landform classification based on curvature and slope using specific values for small agricultural areas (10-20ha)? For instance, to define the following hillslope...

10 March 2023 5,971 1 View

How to do optimization Zn and Pd porphyrin in Gaussian?

Hi, I am working on the optimization of metal porphyrins, using different basis set for the organic (B3LYP/6-31G) and the metallic part (LANL2DZ). I don't know why the calculation isn't...

13 February 2023 3,126 5 View

Do contrasting digital elevation data follow a normally distributed curve?

I have a digital elevation model of a study site. The study site (5 ha) has a contrasting relief, that is, it has very low and very high elevations. I used a GIS software to extract the elevation...

06 February 2023 1,419 3 View

Nitrate Nitrogen, Total Nitrogen, or Ammonium Nitrogen?

I study the effect of transported soil nutrients into water bodies (creeks, lakes, etc.), and the potential negative effect of eutrophication. I have 300 soil samples from crop fields. The lab...

21 October 2022 9,222 6 View

How to calculate surface runoff?

Hi, could I get some suggestions about how to determine (1) the depth of water that infiltrates into the soil profile; (2) whether surface runoff will occur, and if so, how much. Assume that for...

09 December 2021 1,405 3 View

RNA later for the preservation of RNA in fecal samples at room temperature for one day (37°C)?

I am planning to collect human fecal samples for metatranscriptomic analysis using MGI. These samples are from indigenous people living in a region with high temperatures. I will have access to a...

06 August 2024 1,367 3 View

How to understand this crystallographic phenomenon of low temperature crystals in zeolite?

During low-temperature testing, new diffraction peaks that appear could be indicative of several phenomena. In one of our tests, we observed notable new peaks around 40° and 45° in a specific...

06 August 2024 726 3 View

Is it possible to improve the reforming section of the Haber-Bosch process without using air separation units?

A typical reforming section in a large-scale Haber-Bosch process (Figure 1) comprises two reactors. A mixture of methane (CH4) and steam (H2O) is fed into a primary reformer to produce syngas via...

01 August 2024 7,051 5 View

What is the best way to drop a plasmid?

Please address the best way to drop a plasmid. Background: I have a "bait" plasmid resistant to kanamycin and a "prey" plasmid resistant to carbenicillin. After many rounds of streaking on...

25 July 2024 2,532 3 View

What is the principle/mechanism behind aging of carbon (graphite) containing refractory mix for isostatically pressed refractories?

The resin bonded carbon containing refractories are aged before use. How time of aging is determined? And mechanism behind aging.

23 July 2024 3,205 0 View

Why my gel electrophoresis has smearing?

Greetings. I’m currently running a nested pcr for giardia. My mastermix comprised of 3mM Mgcl2, 5unit of taq polymerase, 0.2uM of forward and reverse primers each respectively and 0.2mM of dNtp...

22 July 2024 9,761 5 View

Appearance of crystallization peak in heating cycle of DSC test?

For which types of polymers, the crystallization peak in heating cycle of DSC test can be observed and for which types cant? In another word, when this exothermic crystallization can be observed...

18 July 2024 348 3 View

My rosetta strain has chloramp resistance and i am transforming my plasmid with amp resistance but not getting colonies on chloramp/amp LB plates?

I have done the same procedure with BL21 and pLysE but i got colonies but multiple times on rosetta i did but not getting. can anyone explain what would have gone wrong?

12 July 2024 9,904 1 View

Quelles applications innovantes peuvent bénéficier des propriétés des géopolymère?

Les géopolymères offrent plusieurs propriétés intéressantes qui peuvent être exploitées dans diverses applications innovantes : 1. Construction durable : - Bétons à faible empreinte carbone -...

10 July 2024 7,457 1 View

Would anyone care to recommend an inexpensive waterproof serviceable (e.g., batteries can be changed) temperature logger?

I've been using Hobo pendants for years but they are up from less than $50 a few years ago to over $100, and I'm in need of an alternative.

08 July 2024 7,164 1 View