Africa Overland by David Hardham free download

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An adventurous Australian who in 1971 set out to explore the wilds and depths of Africa overland. The first part of the journey is Trans Africa from London to Jo'Burg via a 4WD converted army truck. The second relates stories of living in apartheid South Africa and the third describes hitchhiking from Jo'Burg to Nairobi before flying back to London. Download Download
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A short history of electric motors

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With the invention of the battery (Allessandro Volta, 1800), the generation of a magnetic field from electric current (Hans Christian Oersted, 1820) and the electromagnet (William Sturgeon, 1825) the foundation for building electric motors was laid. At that time it was still open whether electric motors should be rotating or reciprocating machines, i.e. simulate a plunger rod of a steam engine. The first rotating device driven by electromagnetism was built by the Englishman Peter Barlow in 1822 (Barlow's Wheel). After many other more or less successful attempts with relatively weak rotating and reciprocating apparatus the German-speaking Prussian Moritz Jacobi created the first real rotating electric motor in May 1834 that actually developed a remarkable mechanical output power. His motor set a world record which was improved only four years later…
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The Survival of Civilization John D. Hamaker free download

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The Survival of Civilization is regarded by a growing movement worldwide as a blueprint for the survival of the Earth, restoring ecological balance and, perhaps, even recreating Eden. The health and well-being of all living things ultimately depends on a highly mineralized, alive and vibrant soil. Rock dust adds up to a hundred elements and trace minerals and can greatly increase yield and quality of food, making organic agriculture truly viable. Undertaking the task of remineralization is urgent to restore our agricultural soils, to save the dying forests in the temperate latitudes, and to stabilize our climate.” Download Download
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Time and Relational Theory Morgan Kaufmann Publishers free download

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Time and Relational Theory provides an in-depth description of temporal database systems, which provide special facilities for storing, querying, and updating historical and future data. Traditionally, database management systems provide little or no special support for temporal data at all. This situation is changing because: * Cheap storage enables retention of large volumes of historical data in data warehouses* Users are now faced with temporal data problems, and need solutions * Temporal features have recently been incorporated into the SQL standard, and vendors have begun to add temporal support to their DBMS products Based on the groundbreaking text Temporal Data & the Relational Model (Morgan Kaufmann, 2002) and new research led by the authors Download Download Time and Relational Theory is the only book to offer a complete overview of…
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Network protocols at different layer in osi model

Education, Networking, Telecom, Tutorial, Uncategorized
This is a list of network protocols, categorized by their nearest Open Systems Interconnection (OSI) model layers:- Layer 1 (Physical Layer) Telephone network modems IRDA physical layer USB physical layer EIA RS-232, EIA-422, EIA-423, RS-449, RS-485 Ethernet physical layer 10BASE-T, 10BASE2, 10BASE5, 100BASE-TX, 100BASE-FX, 100BASE-T, 1000BASE-T, 1000BASE-SX and other varieties Varieties of 802.11 Wi-Fi physical layers DSL ISDN T1 and other T-carrier links, and E1 and other E-carrier links SONET/SDH Optical Transport Network (OTN) GSM Um air interface physical layer Bluetooth physical layer ITU Recommendations: see ITU-T IEEE 1394 interface TransferJet Etherloop ARINC 818 Avionics Digital Video Bus G.hn/G.9960 physical layer CAN bus (controller area network) physical layer Mobile Industry Processor Interface physical layer infrared wi-fi Layer 2 (Data Link Layer)[edit] ARP Address Resolution Protocol ARCnet Attached Resource Computer NETwork CDP…
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Java For Dummies 6th Edition free download

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Java is used for developing web and mobile applications. In this up-to-date bestselling book, veteran author Barry Burd shows you how to create basic Java objects and clearly explains when you should simply reuse existing code. Download Download Explores how the new version of Java offers more robust functionality and new features such as closures to keep Java competitive with more syntax-friendly languages like Python and Ruby Covers object-oriented programming basics with Java, code reuse, the essentials of creating a Java program using the new JDK 7, creating basic Java objects, and new Eclipse features Features a companion website that offers all code from the book and bonus chapters Java For Dummies, 6th Edition gets you started with creating Java applications quickly and easily.  
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OSI Model

Education, Networking, Telecom, Tutorial, Uncategorized
The Open Systems Interconnection model (OSI Model) is a conceptual model that characterizes and standardizes the communication functions of a telecommunication or computing system without regard of their underlying internal structure and technology. Its goal is the interoperability of diverse communication systems with standard protocols. The model partitions a communication system into abstraction layers. The original version of the model defined seven layers. Layer 1: Physical Layer The physical layer defines the electrical and physical specifications of the data connection. It defines the relationship between a device and a physical transmission medium (e.g., a copper or fiber optical cable, radio frequency). This includes the layout of pins, voltages, line impedance, cable specifications, signal timing and similar characteristics for connected devices and frequency (5 GHz or 2.4 GHz etc.) for wireless devices. It…
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