Ujjal Dey

Indian Institute of Technology Kharagpur | IIT KGP · Department of Mechanical Engineering

Newton’s theory of gravitation solvedmany problems of celestialmechanics but led to some major problems, one of which was that it gave rise to a serious paradox discussed in this article. The paradox has a number of manifestations one of which is presented here. It should be remembered that the root cause of all these paradoxes is fundamentally the...

Web-based learning plays a vital role in the modern education system, where different technologies are being emerged to enhance this E-learning process. Therefore virtual and online laboratories are gaining popularity due to its easy implementation and accessibility worldwide. These types of virtual labs are useful where the setup of the actual lab...

The current trend of simulator-based analysis, especially in the area of robotics had emerged broadly. This kind of simulation gives initial familiarization of the system, which is very useful for introductory level courses in robotics as well as research-based work. Simulation developed through any commercial software’s requires its installation o...

Manipulation in micro or nanoscale with robotic manipulators under observation of electron microscopes is a widely used strategy for fabrication of nanodevices and nanoscale material property characterization. These types of manipulation systems can handle the relatively larger scale of objects. However, the complexity of manipulation increases hig...

The concept of a nano-laboratory inside an SEM involves performing a sequence of tasks in a continuous pattern. Robotic systems with nanoscale motion resolution facilitate in-situ manipulation and characterization of nanomaterials to assemble nanodevices inside SEMs. Precise motion control of micromanipulators is required at both macro and micro-na...

Three dispersion techniques were investigated for fabricating AA6061-0.5 wt.% CNT composites by combined stir-casting and squeeze-casting - direct drop of CNT (DD), mixed Al and CNT pellet drop (PD), and direct drop of ultrasonicated CNT (USDD). Al-20Mg alloy was added to enhance CNT wettability. The PD samples resulted in the highest retention of...

A method of fabricating textured flexible solar cells and textured flexible solar cells attained thereof is provided by involving a positive textured flexible substrate obtained from an additively manufactured negative textured template.

In recent trends, it has been found that nanorobotics systems inside SEMs facilitate in-situ manipulation and characterization for the assembly of nanodevice. However, the complexity of managing the total manipulation system increases due to constricted workspace and lack of proper process feedback information during nanomanipulation. Multiple comp...

Nanohandling of a robotic system inside an scanning electron microscope (SEM) to manipulate and characterize nanomaterials is a complex task for any user with manual control strategies. Therefore, the need for automation of these robotic systems is increasing rapidly for various interdisciplinary applications in nanotechnology. Here an automatic ha...

The simulation‐based analysis of any robotic system has emerged broadly in the past few years for application in educational and research enhancement. Currently, many simulation tools are available for different research areas on robotics with some advantages and limitations. In this study, the methodology of creating a web‐based graphical user int...

It is a well-established fact that the Earth’s rate of daily rotation is decreasing at a current rate of 6 × 10−22 rad s−2. Initially, it was proposed that the angular momentum of the spinning Earth is being transferred to the orbiting Moon due to the friction between the tidal bulge and the Earth. This causes the Earth to slow down, and the increa...

The theory of Velocity Dependent Inertial Induction, based upon Extended Mach’s Principle, has been able to generate many interesting results related to celestial mechanics and cosmological problems. Because of the extremely minute magnitude of the effect its presence can be detected through the motion of accurately observed bodies like earth satel...