Design of direct digital frequency synthesizer & transmultiplexer

Design of direct digital frequency synthesizer & transmultiplexer

Автор: Sunandan Bhunia and Snigdha Madhab Ghosh

The purity and resolution are the two important factors of designing the DDFS, which need to be improved as much as possible. In this book different models of the DDFS are created, implemented and examined for different aspects to determine what would work best for an application. This book also focuses on the realization of fast FDM-TDM transmultiplexer algorithm used to construct a bank of digital filters. This book comprises of six chapters in which the last chapter is for major findings and future scope of work for young researchers.

Marine Atmospheric Boundary Layer Studies during INDOEX, IFP-99

Marine Atmospheric Boundary Layer Studies during INDOEX, IFP-99

Автор: D. Bala Subrahamanyam and Radhika Ramachandran

«The Atmospheric Boundary Layer over the oceanic surface is commonly referred to as the Marine Atmospheric Boundary Layer (MABL) and it can be considered as the turbulent region in the immediate vicinity of the oceanic surface. The structure and characteristics of the MABL and its interactions with the oceanic surface and the overlying free atmosphere are known mainly as a result of a synergistic combination of observational studies, numerical and laboratory simulations, and dimensional analysis. Our present knowledge and understanding of the MABL over various oceanic regions of the globe comes from the experience and expertise acquired during various field experiments. This thesis aims at improving our understanding of the structural characteristics of the MABL and its associated dynamics over the data-sparse region of western tropical Indian Ocean by making use of the meteorological data collected onboard Oceanic Research Vessel Sagar Kanya and Kaashidhoo Climate Observatory during…

Ecological Study and Nutritive Value of Some Perennial Grasses

Ecological Study and Nutritive Value of Some Perennial Grasses

Автор:

The purpose of this study was to describe the ecology of six perennial grasses communities in canal banks habitat in the North Nile Delta region of Egypt and to relate it and its associates vegetation to edaphic conditions. Also, it shed light on the nutritive status of the selected grasses by examining the proximate chemical composition, antinutritional factors (i.e secondary metabolites) and energy values.

Catalysis to produce hydrogen

Catalysis to produce hydrogen

Автор: Natthakich Assanee

The share market of hydrogen is increasing with the implementation of fuel cell systems and the growing demand for zero-emission fuels. Hydrogen production by using metal catalyst will need to increase with this growing market. However, some carbon is deposited on the catalyst but there was a window of operation where the deposited carbon did not have too great an effect on hydrogen production under different conditions. Carbon formation deactivates the catalyst, resulting in short life cycles. In order to improve process performance, in particular minimizing catalyst deactivation caused by carbon formation and maximizing the yield of hydrogen product, the addition of the promoters to catalyst is the most familiar method. The book is focused on the art of the promoters application on metal catalyst for hydrogen production from the methane steam reforming process at high pressure and the steam iron process over promoted Fe-oxide based catalyst.

H? Filter Design

H? Filter Design

Автор: Ritesh Singh

During an aircraft stop, the load may range from nearly nothing at brake application (when many aircraft are still nearly airborne) to greater value than the static loads. The energies absorbed by aircraft brakes are orders of higher magnitude. Aircraft anti-­skid brake system uses sensors monitoring the movement of aircraft, and controls the system according to how much the wheel slide. This system can be developed from a number of switching techniques called anti-­skid braking system. In this work, slip-ratio-controlled technique is used for the aircraft brake system. During fault-free condition of operation, it shall be able to stop the aircraft in minimum possible distance without any wheel lock condition under various braking conditions like runway type, runway and type characteristics, braking speed, landing load and brake pad characteristics. An estimate of slip is estimated using a technique called H? filter design. The purpose of estimation is to make the slip, error free,…