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Why positive semidefinite state penalty matrix in LQR and LQT problems?

Why the state weighing matrix is taken to be positive semidefinite and not positive definite in optimal control problems - like LQR(Linear Quadratic Regulation) and LQR (Linear Quadratic Tracking?

07 August 2018 2,813 3 View

Which sensors are generally costly in Aircraft systems?

Accelerometer or pitch rate sensor Which sensor is more expensive? Can anyone tell or give a suitable paper or document?

10 November 2017 1,851 1 View

Second order linear equations?

Why is it not possible to obtain a continuous open loop control u(t) such that each solution of y''+y=u(t) approaches the origin as t approaches infinity independently of initial conditions? I rea...

05 June 2017 7,985 2 View

Differential algebraic equations?

Why do we go for differential algebraic modelling of dynamical systems when we can solve the problem algebraic equations as constraints to a simple differential equation (the state of art for...

03 April 2017 9,009 5 View

n linearly independent solutions of a nth order differential equation?

How do I prove that a nth order differential equation has n linearly independent solutions?Also, how to prove that there is no possible solution other than those covered by the linear combination...

07 August 2016 5,130 10 View

How softwares and hardwares work?

We all work in an environment where we use computers extensively for carrying out research.But i believe that not many know the actual interactions between the software and hardware,I want know...

31 December 2015 2,767 2 View

How can the gate to source voltage in a nMOSFET can atract electrons from heavily doped n regions when it is vertical ?

The gate to source voltage in a nMOSFET is vertical. Then how can it attract the electrons in the n region because the electric field associated with it is vertical and does not apply to those...

01 February 2015 3,613 6 View

How to start writing a research paper?

I want start a original work on calculus.How should I begin?

31 December 2014 3,864 2 View

Books for control systems

Please suggest best boks for studyibg control systems engineering.

08 September 2014 1,718 9 View

What decides the value of capacitors used in power supply?

What decides the value of capacitor used in power supply? The value is 2200 microfarad. Please also suggest some books for understanding capacitors from the basics.

04 May 2014 488 6 View

Which Scopus Journal provides the most affordable fees?

"PUBLISHING IN A SCOPUS JOURNAL" Researchers are now at a cross road. The critical need to publish in a Scopus or ISI, etc journal is ever vital. Journal Publication fees must be submitted....

10 August 2024 8,621 1 View

Geotechnical Engineering (Proceedings of the ICE) time review?

Hello everyone, I recently submitted an article to Geotechnical Engineering (Proceedings of the ICE), and the current status has been listed as "EiC Pre-assessment: Ready" for the past 20 days. I...

10 August 2024 6,493 1 View

Seeking Advice on Viability and Execution of Undergraduate Thesis Topic?

Hello everyone, I am currently developing a thesis proposal and would appreciate your input on its viability and how to effectively carry it out. My proposed topic is: "Does the perceived threat...

10 August 2024 8,992 0 View

Who will be moral responsible for the death of thousands of people in the event of an earthquake?

Who will bear moral responsibility for the deaths of thousands of people in the event of an earthquake? Weeks and months remain before the onset of strong earthquakes that bring death to...

08 August 2024 6,134 12 View

Are there any instruments for studying time similar to the way it is in space?

There are a huge number of methods for studying objects in space, according to the senses (and not only). Mechanical, thermal, optical, acoustic, electrical, magnetic, based on particle beams,...

06 August 2024 7,102 0 View

In the case of a wound l recurrence after radical breast cancer and sentinel lymph node biopsy. Are the sentinel lymph node procedure recommended?

In the case of a wound l recurrence after radical breast cancer and sentinel lymph node biopsy. Are the sentinel lymph node procedure recommended? If no axillary lymph node dissection was not...

05 August 2024 8,056 1 View

Who of all the Global Scientific community will help me Prof. Dr. Yoshida make way for TPEOM, MEC ~EMC to return the atmospheric gases to the norma ?

TEP presentation caption (The Environmental Project) Re: Why should Washington’s DC, or any country government point of location think of as nowadays of as to being 'tomorrow as to come! if it...

03 August 2024 2,484 1 View

Regarding a model for simulating battery charge and discharge, what do you consider to be high fidelity?

Regarding a model for simulating battery charge and discharge, what do you consider to be high fidelity? What is the acceptable percentage of error (regardless of the metric)? Could you suggest...

03 August 2024 5,358 0 View

Interested in a SCOPUS collaboration?

Hi RG family. My team and I are working on some SCOPUS publications and we need co-authors who are willing and capable of undertaking both qualitative and quantitative-based studies. The scope...

02 August 2024 7,843 0 View

Interested in a SCOPUS collaboration?

Hi RG family. My team and I are working on some SCOPUS publications and we need co-authors who are willing and capable of undertaking both qualitative and quantitative-based studies. The scope of...

02 August 2024 8,572 0 View