Generally, controllers are tuned to meet the desired time and frequency domain specifications for integer/fractional order real coefficient systems whose frequency response is symmetric about the origin of the complex frequency plane. These controllers are tuned through analytical/numerical approaches. On the contrary, the frequency responses of the complex coefficient systems are unsymmetrical, and hence tuning of controllers should consider both positive and negative frequencies.

The development of processing maps using the dynamic materials modelling (DMM) approach is a widely used method for choosing the appropriate process parameters for the thermomechanical processing of any material. A processing map depicts the variation of metallurgical power dissipation efficiency (η) and the material stability with changes in temperature and strain rate for a constant strain.

Biogas issuing is a renewable and biodegradable clean energy source, that can be used to generate power and heat. The main component of both biogas and natural gas (NG) is methane diluted with inert gases like carbon dioxide (CO2). However, despite their advantages, it is not widely used because the composition can vary with the feedstock and therefore lead to uncertain combustion/engine performance and damage the hardware.

Fluid flow and heat transfer in regenerative cooling channels of rocket nozzles is a challenging research problem owing to its physical and geometrical complexities. Convergent–divergent rocket nozzles realize a varying wall heat transfer profile with a peak at its throat region. This creates an inherent difficulty in designing a proper single counter-current regenerative coolant path to maintain the nozzle wall within safe temperature limits during operation.

The single-stage-to-orbit (SSTO) reusable launch vehicle is an emerging cost-effective, reliable, and environmentally friendly space transportation concept. The dual throat nozzle (DTN) is a typical altitude compensating nozzle that ensure adapted nozzle flow throughout the flight. The DTN has an inner primary nozzle and an outer secondary nozzle. Hence, it is capable of expanding different propellant/oxidizer combinations. The parallel burn operations in which the expansion of combustion products from both thrust chambers exhibits an interesting flow phenomenon in the DTN.

Biological composites such as bone, nacre, spider silk, and bamboo are known for their magnificent mechanical properties compared to their constituents at the basic level. Their fine mechanical properties such as high strength and toughness are attributed to various geometric and material properties. Of these, the staggering type and hierarchical structure are two essential geometrical properties responsible for the superior mechanical properties. Bio-inspired composites are artificial composites inspired from the design of biological composites.

Hypersonic air-breathing engines are constrained to do supersonic combustion because of the effects such as vibrational excitation, dissociation, and high total pressure loss when performing subsonic combustion. Supersonic combustion has its challenges due to the very low residence time and limited combustor length. The use of liquid fuel is an attractive option for supersonic combustion due to its high energy density. Liquid fuel can also be used as a coolant since hypersonic air-breathing vehicles produce high thermal loads.

Defect free machining of Fibre Reinforced Polymer (FRP) Composites, crossing the challenges posed by anisotropic non-homogenous fibre-matrix system, is one of the important material processing requirements with a wide scope in industrial applications. Eccentric Sleeve Grinding (ESG) projected in this research is a unique strategy with progressive-intermittent cutting scheme for achieving minimal damage machined surfaces on FRPs.

Film cooling performance of a novel double jet configuration for gas turbine blade cooling is analysed. The proposed scheme has a primary compound angle hole along with a secondary hole compounded in the laterally opposite direction. The primary hole is provided with a trench at the coolant hole exit.

A human thermoregulatory model incorporating morphological details of Indians is established. The study investigated core and skin temperature variation during normal, hot and cold environments of western and Indian subjects as well as Indian male and female subjects. Effect of BMI, age, clothing and short-wave radiation on thermoregulation is also analysed. The most notable difference between western and Indian subjects is the delay in sweating and lower shivering rates under hot and cold environments respectively.