What is critical real-world applications still unsolved problems?

More Essam H Houssein's questions See All

Literature Review for The Impact of Digital Transformation on Project Management ?

i need 6 previous studies containing The aim of this study, the type of the study,Results Recommendations, publisher, year of creation

17 March 2024 3,495 3 View

How to get HOMO and LUMO coefficients at the reactive sites for the reactants from gaussian?

I want to calculate the HOMO-LUMO coefficient for each atom of my molecules. I am using Gaussian software for calculations. As I can see in multiwfn manual, I can get the orbital percentage but...

08 July 2023 10,011 1 View

Which is better in diagnosing compounds, HPLC method or FPLC method and why?

I want using two methods to spread compounds from crud solution.

05 January 2023 3,729 4 View

Does anyone have suggestions as to which? would be the best modelling software in Ro + DI?

I'm planning to build a model of a hybrid reverse osmosis and deionisation , for my research probably using wav. I don't have a lot of experience with modelling software and I am wondering does...

14 November 2022 4,483 0 View

Does the Kalman Filter Require Linearity in the Controls?

I'm studying the topic from Probabilistic Robotics by Thrun Burgard and Fox. In the Extended Kalman Filter algorithm, we linearized the action model in the following way. 𝑔(𝑢(𝑡),𝑥(𝑡-1)) =...

23 October 2022 2,352 5 View

In case we feed BWRO (one pass) with 10 ppm total TDS, can we get purified water less than 1 ppm ?

Hi Every one In case we feed BWRO (one pass) with 10 ppm total TDS, can we get purified water less than 1 ppm? Using high rejection Ro membrane , what the side effect to use this...

02 February 2022 1,149 3 View

How to dissolve a lipophilic compund in media?

I am using a lipophilic compunds and used DMSO less than 0.1% to dissolve it and prepared stock solutions out of it.. But when I put the drug in media to be used on the cells, it crystallises. I...

04 October 2021 7,546 1 View

Merging/combined high and low resolution gravity data, is it a challenge ?

I have a gravity data as 500 m interval and another data set as 1500m interval for the same area. what is the best method to combine them without loosing real information ?

28 July 2021 4,604 10 View

How can I transfer the cells seeded in a 96 well plate to eppendorfs ?

I am studying the metabolites of a drug in the cells and their supernatants and for this, I seeded my cells in a 96 well plate with the treatment. Now I want to transfer the cells in Eppendorf to...

01 July 2021 6,762 3 View

Why we used different methods to purification protein ?

pure protein , methods to puried , characterized pure protein

16 November 2020 7,524 3 View

What is the difference between mathematical R^4 space and physical 4D unit space?

We assume that the difference is huge and that it is not possible to compare the two spaces. The R^4 mathematical space considers time as an external controller and the space itself is immobile in...

10 August 2024 6,678 14 View

Hello Everyone ! I'm looking for a good journal to publish my manuscript with low publication cost?

I am Looking for a Science Journal with good impact factor and low publication cost to publish a review paper. Your suggestions would be appreciated.

06 August 2024 6,796 3 View

Any idea about 'International Research Journal of commerce , arts and science? Is it a UGC listed journal?

Any idea about 'International Research Journal of commerce , arts and science? Is it a UGC listed journal? Kindly advice

04 August 2024 7,367 3 View

Are authors sowing for scientific Journals to be reaping the benefits? We are charged for publication but we offer free peer review services, why?

As authors and academic writers, we usually prepare our manuscript using our own resources. We submit these manuscripts to scientific Journals for peer review and publication sometimes at a fee....

03 August 2024 7,304 2 View

Is it true that science is leaving the era of mathematics and entering the era of matrix mechanics?

We assume this to be true. Science leaves the era of mathematics and enters the era of matrix mechanics and the turning point is the discovery of numerical statistical theory called Cairo...

31 July 2024 3,900 2 View

Posthoc test lettering in JAMOVI?

Does anyone know of a module for the JAMOVI software that is capable of generating mean separations using the classic letters based on post hoc results (e.g., Tukey test)? If, as I believe, such...

31 July 2024 3,333 4 View

May I know the exact Quartile of the journal- Advanced Engineering Materials (Wiley) for material science category?

In some data sources it has been grouped in Q1 and some shows it is Q2.

29 July 2024 4,227 2 View

All math can be explained by iterator of code?

all math can be traversed by code? all math can be translate to code?

26 July 2024 9,530 0 View

What are the important scholarly articles related to 'Use of Likert Scale in social science research' ?

The Likert scale is a commonly used measurement tool in social science research to assess people's attitudes, opinions, or perceptions. The social science students still have difficulty selecting...

25 July 2024 7,535 1 View

Can we eliminate the stress singularity at the tip of the crack by manipulating the elastic constants?

The aim of the research here is to prevent the propagation of the crack in the fabricated elastic medium with useful applications.

25 July 2024 9,976 3 View

Essam H Houssein

Unsolved Problems

There are many unsolved problems in mathematics. Some prominent outstanding unsolved problems (as well as some which are not necessarily so well known) include

1. The Goldbach conjecture.

2. The Riemann hypothesis.

3. The conjecture that there exists a Hadamard matrix for every positive multiple of 4.

4. The twin prime conjecture (i.e., the conjecture that there are an infinite number of twin primes).

5. Determination of whether NP-problems are actually P-problems.

6. The Collatz problem.

......

https://mathworld.wolfram.com/UnsolvedProblems.html

Anton Vrdoljak

An Euler brick is a cuboid that possesses integer edges a>b>c and face diagonals. If the space diagonal is also an integer, the Euler brick is called a perfect cuboid, although no examples of perfect cuboids are currently known.

David Eugene Booth

How to deal with COVID-19 especially the new mutant? Best, David Booth