10 December 2018 1 8K Report

I am so pleased to know more about establishment of R134a gas refrigeration in advance.

More Emad Behdad's questions See All
Can medicinal plants really play an inherent rule in the COVID-19 tackle?

Numerous scientific reports cited plant extracts with potential antiviral activity and even anti-COVID-19? Why these findings are neglected? I remember very well the warning released by the WHO to...

17 February 2021 2,141 9 View

When i made an Autotune on GC-MS to check the apparatus, it's not continue the process and there a problem in Mass Filter Electronics?

Dear Connections, I hope you are doing well when I made an Autotune on GC-MS to check the apparatus, it does not continue the process, and there a problem in the mass Filter Electronics as shown...

10 October 2020 8,131 3 View

Does anyone know what is an appropriate statistical analysis of drug release studies?

I am measuring the drug release of a few drug-eluting implants in dissolution medium in different time intervals. All the measurements are in triplicates. Would ANOVA or TTEST is an appropriate...

20 September 2020 8,183 5 View

What is the proper solvent which used in liquid detergent to make it soluble?

Good afternoon everyone, I hope you are doing well I had several samples of liquid detergent I wanna to soluble it with a solvent. I tried with both of ( water, Ethyl alc., Parrafin Oil, DPG,...

05 August 2020 8,664 3 View

What is the best parameters in GC-MS for DB-WAX (60m*0.250mm*0.25microm) in the fragrances field?

Hi everyone, I hope you are well and stay safe. I am an operator for GC-MS instrumental and my company replace the column with another new one which called DB-WAX (60m*0.250mm*0.25microm). A...

14 June 2020 4,440 3 View

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Under the conditions of the Corona virus, most countries tended to use the method of distance education, using various methods, including: e-learning platforms, and social media. It is true that...

10 April 2020 7,181 3 View

IS That okay if i injection ETOH to GC-MS?

I wanna to injection sample which contain only ethyl alcohol is that okay or not?

06 April 2020 9,164 4 View

Could car engine oil be an apropriate replace for freeze dryer pump oil?

We just got a new freeze dryer (Biobase) but unfortunately the machine arrived without pump oil, so could any machine/ car oil be used as a substitute? if not could you pls suggest any other type...

06 February 2020 167 3 View

I need to contact some "Full professors" interested in antibacterial potential of medicinal plants, could you please suggest me names and emails ?

I am an associate professor, I am suffering from a lack of expert persons under the title: "Full professor" in the field of antibacterial potential of medicinal plants. I should be most grateful...

28 December 2019 9,919 5 View

What's the effects of the wet season and dry season on biological soil crusts specially algae (Cyanobacteria and green algae)?

I work the research about stabilization of soil by Biological soil crust especially algae (Cyanobacteria and green algae) Could anyone please help me about this topic soil stabilization using...

17 December 2019 8,682 3 View

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Necessary tube lenght to cool Natural gas in a dry-ice cooling bath?

I have a tank which contains natural gas at 250 Bar and 293 Kelvin. I want to cool the gas in a dry-ice cooling bath to about 195 Kelvin. The gas will flow in a copper-tube through the bath with a...

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Gas sensor response and recovery time independant of flow rate and chamber volume?

I am trying to obtain the response and recovery times for my gas sensor device. It appears the the response/recovery times are primarily dependant on the flow rate of the gas I inject into the...

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Why do a weight decrease for thermal degradation in nitrogen gas condition?

Hi all The question is related to TGA(Thermogravimetric analysis). Thermal degradation easily understood but why do samples weight decrease? altough just binding is broked, the weight of...

26 February 2021 1,100 5 View

Why do the air flow results vary totally when adding scalar in CFD ?

Dear All, We are using Autodesk cfd to calculate the air flow in a single sided naturally ventilated room, where air flow depends only on buoyancy due to temperature difference between inside and...

25 February 2021 9,602 4 View

Aspen Plus Error: Unknown or undefined bead number?

Hello, in my Aspen Plus Simulation (see attachment) there are two heat exchangers. One HEX1 (oil+gas) ist fed by hot gas which ist coming out of a burner. The other HEX2 (gas+gas) shall work as a...

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NVT or NPT is preferable for gas adsorption simulation ?

Hi there, In order to perform molecule dynamic simulation on gas adsorption on substrate materials, NVT or NPT ensemble is preferable ? Thanks!

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How can I convert permeability unit from barrer to m^2 for using COMSOL MultiPhysics?

I am looking for gas permeability of PDMS for simulation in COMSOL MultiPhysics and using creeping flow , fluid and matrix properties. The permeability unit in COMSOL is m^2 whereas I have the...

08 February 2021 4,305 2 View

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