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Free Download Spatial-Temporal Evolution of Mining-Induced Rock Damage and Ground Control of Roadways by Zhijie Wen , Zhenqi Song , Yujing Jiang , Yujun Zuo , Jian Tao
English | EPUB (True) | 2025 | 245 Pages | ISBN : 9819654386 | 63.7 MB
This book presents the Coal remains the primary energy source in China, with an estimated total coal reserve of 59 trillion tons at depths of less than 2000 meters. Among these, over 50% lie at depths exceeding 1000 meters, primarily distributed in central and eastern China. Deep coal mining has become the new norm for the coal industry's development and resource exploitation. To ensure energy supply for the rapid economic development of central and eastern regions, mining coal resources from depths of over 1000 meters is inevitable. This endeavor holds significant strategic importance for safeguarding national energy security and supporting regional economic growth. However, mining-induced hazards, such as rock bursts, water inrushes, and roof collapses, continue to occur frequently in both local and state-owned coal mines. These incidents pose severe threats to the safety of coal production, tarnish the reputation of China's mining industry, and hinder its development. Therefore, advancing mining engineering-especially the theories of major accident prediction and control-is essential. A deeper understanding of the dynamic processes underlying mining-induced pressure and strata movement is necessary. Promoting safe and efficient coal mining through informed decision-making and management supported by scientific, quantitative methods is a critical and urgent task. Achieving informatization, intelligence, and visualization in mining operations will be key to fundamentally addressing the current safety challenges in China's mining industry. In recent years, the author and their team have conducted in-depth studies on models of dynamic disasters and surrounding rock control in deep mines, supported by projects under the National Basic Research Program (973 Program), the National Key R&D Program, as well as talent and general research funds and specialized consultancy projects from the Chinese Academy of Sciences. The main research focuses include constructing spatial structural models of overlying strata in mining areas, analyzing the spatiotemporal evolution of mining-induced stress, and developing proactive control technologies for dynamic disasters in mining areas. This book aims to provide foundational insights into the occurrence and control of major mining accidents. It proposes a decision-making framework for predicting and managing such disasters by controlling the movement of surrounding rock and stress conditions induced by mining. These efforts are expected to provide a reference for advancing research in related fields.

Free Download Sparta's Sicilian Proxy War: The Grand Strategy of Classical Sparta, 418-413 BC by Paul A. Rahe
English | September 26th, 2023 | ISBN: 1641773375 | 376 pages | True EPUB | 4.22 MB
The great expedition to Sicily described in the sixth and seventh books of Thucydides' history can be depicted in a variety of ways. By some, it has been thoughtfully treated as an example of overreaching on the part of the Athenians. By others, it has been singled out as a sterling example of patriotism, courage, and grit on the part of the Syracusans.

Free Download Spacecraft Operations by Florian Sellmaier
English | EPUB | 2022 | 610 Pages | ISBN : 3030885925 | 105.7 MB
This book describes the basic concepts of spacecraft operations for both manned and unmanned missions. The first part of the book provides a brief overview of the space segment. The next four parts deal with the classic areas of space flight operations: mission operations, communications and infrastructure, the flight dynamics system, and the mission planning system. This is followed by a part describing the operational tasks of the various subsystems of a classical satellite in Earth orbit. The last part describes the special requirements of other mission types due to the presence of astronauts, the approach of a satellite to another target satellite, or leaving Earth orbit in interplanetary missions and landing on other planets and moons.

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Free Download Soundscapes of Education: Nurturing Creativity through Music and the Arts by Wai-Chung Ho, Siu-Hang Kong
English | August 8, 2025 | ISBN: 9819682401 | 236 pages | Epub PDF (True) | 14 Mb
This book focuses on nurturing students' creativity through the integration of music and other creative art forms. It presents the soundscape as an immersive auditory environment that surrounds us, capable of evoking emotions, stimulating imagination, and inspiring creative thought. By actively engaging with the soundscape while listening to music or the sound environment, individuals can enhance their creative experiences and discover new avenues for exploration and expression in teaching. Additionally, the book explores creativity within the soundscapes of diverse cultures, broadening students' perspectives, while promoting cultural awareness, empathy, and interconnectedness.

Free Download Sophie's Cave (Germany) - a Late Pleistocene Cave Bear Den (Famous Planet Earth Caves) by Cajus G. Diedrich
English | January 19, 2018 | ISBN: 168108001X | 191 pages | PDF | 95 Mb
Famous Planet Earth Caves presents information about geologically important caves or rock shelters in different kinds of rock formations all over the world. Each volume of this series is a focused monograph on a single cave. The series covers many disciplines that can be applied to study a cave: geology (cave genesis, sedimentology, speleothems) hydro-geology (speleothems for climate reconstructions, aquifer reconstructions), paleontology (cave bear or carnivore dens), archaeology (Palaeolithic to Medieval camp or burial sites) and modern biology. Each volume is beautifully illustrated and written in a simple manner that will make interest general readers, speleologists and natural scientists, alike. This volume gives details of Sophie's cave in Ahorntal, Germany. The cave is notable for the presence of bears throughout the ice age and this has shaped the biological and hunting activities in its vicinity. Readers will find information about the speleology, ice age paleontology and archaeology of this intriguing limestone show cave.

Free Download Solidification End Reduction of Continuous Casting Process (Key Steel Manufacturing Technologies by Collaborative Innovation) by Cheng Ji, Miaoyong Zhu, Rui Guan
English | August 17, 2025 | ISBN: 9819685435 | 432 pages | PDF | 77 Mb
This book summarizes the formation of solidification defects in continuous casting strand and the process mechanism of improving central segregation, porosity and shrinkage under solidification end reduction. The behavior rules of shell deformation, crack initiation and propagation, solute transport, shrinkage cavity closure, microstructure refinement and evolution during solidification end reduction process were systematically expounded. It introduces how to realize the accurate, efficient and stable implementation of the solidification end reduction in the production process, and the design and development of key equipment. Finally, taking the specific production lines of Baosteel and Panzhihua Iron and Steel Co., Ltd. as examples, the industrial application and effect of solidification end reduction technology are listed.

Free Download Solid State Lasers: New Developments and Applications by Massimo Inguscio, Richard Wallenstein
English | PDF | 1993 | 346 Pages | ISBN : 0306445980 | 34.6 MB
This volume contains the lectures and seminars presented at the NATO Ad vanced Study Institute on "Solid State Lasers: New Developments and Appli cations" the fifteenth course of the Europhysics School of Quantum Electronics, held under the supervision of the Quantum Electronics Division of the European Physical Society. The Institute was held at Elba International Physics Center, Marciana Marina, Elba Island, Tuscany, Italy, August 31 -September 11, 1992. The Europhysics School of Quantum Electronics was started in 1970 with the aim of providing instruction for young researchers and advanced students al ready engaged in the area of quantum electronics or wishing to switch to this area from a different background. Presently the school is under the direction of Professors F.T. Arecchi and M. Inguscio, University of Florence, and Prof. H. Walther, University of Munich, and has its headquarters at the National Insti tute of Optics (INO), Florence, Italy. Each time the directors choose a subject of particular interest, alternating fundamental topics with technological ones, and ask colleagues specifically competent in a given area to take the scientific responsibility for that course.

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Why Choose DL4ALL.org?

Spatial-Temporal Evolution of Mining-Induced Rock Damage and Ground Control of Roadways

Sparta's Sicilian Proxy War The Grand Strategy of Classical Sparta, 418-413 BC

Spacecraft Operations

Southern Food American Recipes Straight from the Lone Star State

Southern Cuisine Traditional American Cuisine in the Lone Star Style

Soundscapes of Education Nurturing Creativity through Music and the Arts

Sophie's Cave (Germany) - a Late Pleistocene Cave Bear Den (Famous Planet Earth Caves)

Solidification End Reduction of Continuous Casting Process

Solid State Lasers New Developments and Applications

Solid Starts for Babies How to Introduce Solid Food and Raise a Happy Eater