Direct current machines are a quickly evolving domain whose applications affect many aspects of modern life from computers and printers to toys, electric vehicles, and traction applications. As their many uses continue to grow, it has become apparent that understanding these machines is the key to understanding our future. Operation, Construction, and Functionality of Direct Current Machines brings together many concepts, from the most basic working principles and construction of DC machines to more advanced topics such as electro-magnetism, armature reaction, parallel operations, and many more. Highlighting theoretical concepts and numerical problems, this book is an essential reference source for students, educators, and anyone interested in the field of electric machines.

Sunflower is one of the four major oilseed crops produced in the world. The sunflower oil is preferred over other vegetable oil because of its specific characteristics as it is very easy to refine, has good digestibility, and low level of cholesterol and saturated fats. The yield of this valuable crop is decreasing tremendously due to charcoal rot disease caused by Macrophomina phaseolina. Synthetic chemicals are being used to control the fungal diseases. However, increasing public concern on environmental issues requires alternative disease management systems, which are based on naturally occurring compounds. The present study was designed to evaluate antifungal activity of three Chenopodium species viz. C. album, C. murale and C. ambrosioides against M. phaseolina. All the parts of the selected Chenopodium species exhibited promising antifungal activity against the noxious charcoal rot pathogen. This book is very useful for those researchers who are in search of naturally occurring environment friendly compounds for the management of plant diseases.

"Let us be clear: micro finance is not the charity. It is the way to extend the same rights and resources to low income households that are available to everyone else. It is recognition that poor people are the solution, not the problem. It is way to build their ideas, energy and vision. It is a way to grow productive enterprise and to allow communities to prosper" (Kofi Annan)