Is it correct to identify an air mouvement by the Venturi effect in buildings ?

Knowing that the Venturi effect is used most in tubes (according to my basic knowledge in physics) to increase the speed of air or liquids by reducing the tube volume, my question is if we have...

17 February 2021 1,260 1 View

What are the properties or phenomena that contribute to the compressive strength of: cement paste, standardized mortar, and concrete?

What are the properties or phenomena that contribute to the compressive strength of the following mixtures: cement paste, standardized mortar, and concrete?

07 April 2019 891 4 View

Using the same type of cement, are the compressive strengths of cement paste, standardized mortar, and concrete close ?

Using the same type of cement, are the compressive strengths of cement paste, standardized mortar, and concrete close ?

07 April 2019 2,169 5 View

Is there any data set or sites that offer car accident or traffic data which include information about the automatic speed control car system?

Number of the studies discusses the role of information technology in the prevention of car accidents in order to reduce the number of accidents through data analysis and to find effective...

28 September 2017 7,927 3 View

Hello, i have the baseline less than zero ?

27 September 2017 670 4 View

Yellow floating mass in cell cultures

Hello, We have just started growing cryopreserved primary human epithelial keratinocytes provided from Thermo Fisher, and three days after culture initiation we noticed a yellow floating mass in...

31 July 2017 148 3 View

Registration of Lidar data and multi-spectral image

23 June 2017 6,284 2 View

Is the use of tafel curves valid for a coated metal substrate?

Comparison of the anticorrosion performances in NaCl solution of aluminum alloy samples coated with organosilane films

15 June 2017 6,817 3 View

How can I confirmed the contamination of the ion source in GCMSD Agilent technology?

hello, I want to know, how can I confirmed the contamination of the ion source in GCMSD Agilent technology

29 February 2016 8,163 5 View

Hello everyone I look for a purification protocol of DNA primer by HPLC

Hello everyone I look for a purification protocol of DNA primer by HPLC after being synthesized by a oligosynthetiseur Thank you

02 February 2016 7,146 3 View

Physics: Why do we describe light by referring to its wavelength, but microwaves and radar pulses by referring to their frequency?

In physics, the description of the properties of light generally refers to its wavelength (nm), while in the range of microwaves and radio waves we refer to the frequency of a signal (e.g. kHz or...

03 March 2021 1,682 3 View

Is there any effect of different colours of light (white, red, yellow, blue etc.) on the rate of photosynthesis? If yes, why?

Light is inevitable for the process of photosynthesis reaction. Naturally sunlight plays the vital role for this process. Light may be of different colours like white, red, yellow, blue etc....

02 March 2021 7,890 2 View

In an eye with Tyndall, does each dot correspond to an individual cell?

When you observe the presence of Tyndall in an inflamed eye: Does each of the small floating dots correspond to an individual cell or to an aggregate of cells? Does a conventional slit lamp have...

27 February 2021 6,326 2 View

Standard curve shifting over time. How do I stabilise the ELISA?

24 February 2021 1,365 3 View

How can I obtain time series data by country on night-time light (brightness) ?

Hi everyone, Please, how can I obtain time series data by country on night-time light (brightness) ? I've tried, but so far all I can find are maps. I am looking for numerical data, especially in...

24 February 2021 8,625 4 View

How does the injection volume impact LLOQ and ULOQ in regression analysis (LC-MSMS)?

Hello, I have run into an issue that has sparkled a debate at work: is the LLOQ/ULOQ impacted by injection volume under the following circumstances: 1) Same dilution factor of all samples 2)...

23 February 2021 9,159 3 View

What are difference between laser diodes, simple light emitting diodes and power light emitting diodes when operated in the visible spectrum ?

I want to illuminate a scene (small space) using LED to capture photographs or videos of some tiny objects inside the space. But am not sure if I should use a Laser LED, or simple LED or power...

22 February 2021 4,240 4 View

How to interpret this FTIR spectrum of pyrolyzed hydrochar?

20 February 2021 2,840 3 View

Using the Pfaffl method: Is it possible that the ratio of the calibrator does not equal 1?

Hi all, I have a question regarding calculations using the Pfaffl method. I have 3 groups per experiment: 1 control group (calibrator) and 2 treatment groups with 6 to 7 biological repeats per...

19 February 2021 8,351 2 View

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The regenerated cellulose film was prepared by zinc chloride/H2O system. The zinc chloride had been washed away in the regeneration process, and the wet film which was not dried had uniform...

18 February 2021 9,538 1 View