Chromatography a Superiority Formula

Written by Aram Hayrapetyan

Continued from page 1

where -repparttar beginning ofrepparttar 127668 chromatographic column, and -repparttar 127669 end ofrepparttar 127670 chromatographic column.

Let atrepparttar 127671 momentrepparttar 127672 pressure atrepparttar 127673 inlet and outlet ofrepparttar 127674 chromatographic column be correspondingly

Then atrepparttar 127675 moments of time onrepparttar 127676 corresponding sections

ofrepparttar 127677 chromatographic column,repparttar 127678 pressure will be

It may be noticed that

as well as

in this case


We build a matrix of pressures inrepparttar 127679 following way: let each line in it correspond torepparttar 127680 pressures ofrepparttar 127681 column at points

at a pressure atrepparttar 127682 inlet and atrepparttar 127683 outlet ofrepparttar 127684 column at a moment while each column corresponds torepparttar 127685 pressures at a point at moments of time

Thusrepparttar 127686 matrix hasrepparttar 127687 following form

The first column ofrepparttar 127688 matrix corresponds torepparttar 127689 pressure atrepparttar 127690 inlet ofrepparttar 127691 column, whilerepparttar 127692 last one torepparttar 127693 outlet. They are chosen such that inrepparttar 127694 column zone whererepparttar 127695 sample is found at a definite moment of time, there will always exist a constant pressure corresponding to an optimal flow rate. The first column corresponds torepparttar 127696 moment of sample introduction, andrepparttar 127697 last one torepparttar 127698 elution ofrepparttar 127699 separated components fromrepparttar 127700 column. Each element ofrepparttar 127701 matrix corresponds to a definite flow rate at a definite moment of time. To each element ofrepparttar 127702 matrix there corresponds a definite flow rate and followingly its equation fromrepparttar 127703 multiple (3). The matrix elements corresponding torepparttar 127704 passage ofrepparttar 127705 sample with an optimal speed throughrepparttar 127706 corresponding points ofrepparttar 127707 column at definite moments of time are marked in yellow. For these it may be written

The carrier-gas pressure is programmed in such a way that it constantly secures an optimal linear speed for an imaginary point -repparttar 127708 zone ofrepparttar 127709 sample which travels withrepparttar 127710 carrier-gas fromrepparttar 127711 inlet torepparttar 127712 outlet ofrepparttar 127713 chromatographic column in time, keeping ∆ p constant at its ends duringrepparttar 127714 whole cycle ofrepparttar 127715 analysis. This arithmetical model (of Hayrapetyan - Aghababyan) of chromatographic analysis built onrepparttar 127716 basis ofrepparttar 127717 equation of Van Deemter describes in detailrepparttar 127718 mentioned technological process of analysis organization and corresponds to that equation fromrepparttar 127719 multiple (3) which providesrepparttar 127720 optimal conditions ofrepparttar 127721 analysis and leads torepparttar 127722 attainment ofrepparttar 127723 maximum possible efficiency ofrepparttar 127724 column (Hayrapetyan's Effect). In other wordsrepparttar 127725 pressure atrepparttar 127726 inlet and outlet ofrepparttar 127727 chromatographic column is programmed such, thatrepparttar 127728 carrier-gas flow rate inrepparttar 127729 column is optimal in each section atrepparttar 127730 needed moments of time. Thus,repparttar 127731 separation ofrepparttar 127732 sample is characterized byrepparttar 127733 equations fromrepparttar 127734 multiple (3)

and they are all equivalent torepparttar 127735 equation


And thusrepparttar 127736 maximum possible efficiency ofrepparttar 127737 chromatographic column is attained (Hayrapetyan's Effect).

P. S.

C H R O M A B A R O G R A P H Y - a new conveniences F o r m u l a : optimal velocity, managing ability, durability, andrepparttar 127738 maximum possible effectivity ofrepparttar 127739 chromatographic column.


ARAM HAYRAPETYAN 47/6 Vardanants Street, Vanadzor 377201, Republic of Armenia, Tel: (374) 512 0115 E-mail: Web-site: HTTP://CHROMATOGRAPHY.HOTBOX.RU PUBLICATIONS AND ARTICLES: 57 published works, including 21 certificates for individual authorship from USSR and Russia, Germany, Czechoslovakia and Bulgaria. PERSONAL DATES: Born 17 May 1945, married, two children. Daughter born 1972, married. Son born 1977.

A spring called: Drop of water

Written by K.A.Cassimally

Continued from page 1

Anyway why is all this stuff important anyway? Scientists believe that this find may be of interest torepparttar industry. Thereís a small illustration: Imagine not seeing droplets of rain on your carís windscreen when it is in fact raining cats and dogs outside. Cool, isnít it? Well this may well be possible with these new data obtained byrepparttar 127667 scientists fromrepparttar 127668 Collēge de France. How though? Easy enough! The period of contact ofrepparttar 127669 raindrops withrepparttar 127670 windscreen is so minimal thatrepparttar 127671 driver does not even see them!

Water drops bounces like springs, would you ever have thought of this? No, Iím not sure you would.

K.A.Cassimally is the editor in chief of Astronomy Journal and Astronomy Journal Ezine. He is also the co-founder of the RCPL Astronomy Club. K.A.Cassimally is best known for his article 'Harry Potter and the Moons of Jupiter'. He is also Senior Columnist at where he writes 'Not Scientific Science'. Website: : Email:

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