Yu Zhao – författare

Combustion agents for solid fuel propellants and explosives have gained widespread interest in recent years. Their high gravimetric heat of combustion enhances the performance of modern energetic materials. Borohydride compounds have proved to be excellent candidates in this application.High-energy Combustion Agents of Borohydrides covers the most recent developments in the advanced combustion agents of borohydrides. Experimental studies covering the synthesis and characterisation of borohydrides are examined, as well as the interactions between borohydride and propellant ingredients. The properties of BHN/nano Al composites are discussed, as is the effect of borohydrides on the properties of fuel-rich solid propellants. The book concludes with a summary of the prospective development of high-energy combustion agents in solid propellants and explosives, and looks into the future development of military applications. Authored by renowned experts in the field, this book will appeal to researchers in academia and industry seeking a better understanding of how to improve the ignition and combustion performance of propellants and explosives.

This book examines how the state of underground structures can be determined with the assistance of force, deformation and energy. It then analyzes mechanized shield methods, the New Austrian tunneling method (NATM) and conventional methods from this new perspective. The book gathers a wealth of cases reflecting the experiences of practitioners and administrators alike. Based on statistical and engineering studies of these cases, as well as lab and field experiments, it develops a stability assessment approach incorporating a stable equilibrium, which enables engineers to keep the structure and surrounding rocks safe as long as the stable equilibrium and deformation compliance are maintained.The book illustrates the implementation of the method in various tunneling contexts, including soil-rock mixed strata, tunneling beneath operating roads, underwater tunnels, and tunnel pit excavation. It offers a valuable guide for researchers, designers and engineers, especially those who are seeking to understand the underlying principles of underground excavation.

This book examines how the state of underground structures can be determined with the assistance of force, deformation and energy. It then analyzes mechanized shield methods, the New Austrian tunneling method (NATM) and conventional methods from this new perspective. The book gathers a wealth of cases reflecting the experiences of practitioners and administrators alike. Based on statistical and engineering studies of these cases, as well as lab and field experiments, it develops a stability assessment approach incorporating a stable equilibrium, which enables engineers to keep the structure and surrounding rocks safe as long as the stable equilibrium and deformation compliance are maintained.The book illustrates the implementation of the method in various tunneling contexts, including soil-rock mixed strata, tunneling beneath operating roads, underwater tunnels, and tunnel pit excavation. It offers a valuable guide for researchers, designers and engineers, especially those who are seeking to understand the underlying principles of underground excavation.

This open access book primarily focuses on the methodologies for measuring the permeability of tight rock formations. Permeability stands as a pivotal parameter in assessing the permeability or transport capacity of tight reservoirs, exerting a significant influence on the extraction of reservoir resources. Laboratory experiments on permeability serve as a crucial means to understand the intrinsic permeability of shale. However, the permeability of shale is exceedingly low and is susceptible to influences from various experimental factors such as gas adsorption, ambient temperature, and testing apparatus. The precise measurement of shale permeability remains one of the challenges that perplex researchers and designers. This book aims to address the following key issues: permeability measurement methods that take into account the effects of adsorption, and the measurement of anisotropic permeability in rocks.

In order to establish fracture parameters that are both relevant and conducive to safety, the book extensively investigates the fracture mechanical properties of mode I, mode II, and mode III in brittle rock materials.

This open access book is the first to consider the effect of non-uniform fluid pressure in hydraulic fractures. The book covers the key topics in the process of hydraulic fracture nucleation, growth, interaction and fracture network formation.