world's longest railway tunnel

-

















Workers cycle past the northern entrances of the NEAT Gotthard Base tunnel near Erstfeld May 7, 2012. Crossing the Alps, the world's longest train tunnel should become operational at the end of 2016. The project consists of two parallel single track tunnels, each of a length of 57 km (35 miles) (REUTERS/Arnd Wiegmann)

Comments

Post a Comment

Popular posts from this blog

Computer Science

-
Image
Computer science Computer science is the  scientific  and practical approach to  computation  and its applications. It is the systematic study of the feasibility, structure, expression, and mechanization of the methodical  procedures  (or  algorithms ) that underlie the acquisition, representation, processing, storage, communication of, and access to  information , whether such information is encoded as  bits  in a  computer memory  or transcribed in  genes  and  protein  structures in a biological  cell . [1]  A  computer scientist  specializes in the theory of computation and the design of computational systems. [2] Its subfields can be divided into a variety of theoretical and practical disciplines. Some fields, such as  computational complexity theory  (which explores the fundamental properties of  computational  and intractable problems), are highly abstract, while fields such as  computer graphics  emphasize real-world visual applications. Still other fields focus on
Read more

Recruitment

-
Image
Recruitment  refers to the overall process of attracting, selecting and appointing suitable candidates for  jobs  (either permanent or temporary) within an organization. Recruitment can also refer to processes involved in choosing individuals for unpaid positions, such as voluntary roles or unpaid trainee roles. Managers, human resource generalists and recruitment specialists may be tasked with carrying out recruitment, but in some cases public-sector employment agencies, commercial recruitment agencies, or specialist search consultancies are used to undertake parts of the process. Internet-based technologies to support all aspects of recruitment have become widespread. Process [ edit ] These are the steps taken by a recruiter in order to select the best qualified candidate for a position/job in an organization. The "process" is a guide to how recruitment and selection should be carried out. Job analysis [ edit ] In situations where multiple new jobs are created and
Read more

Network Topology

-
Image
Network topology  is the arrangement of the various physical elements ( links , nodes , etc.) of a  computer network .  Essentially, it is the  topological [3] structure of a network and may be depicted physically or logically.  Physical topology  is the placement of the various components of a network, including device location and cable installation, while  logical topology  illustrates how data flows within a network, regardless of its physical design. Distances between nodes, physical interconnections, transmission rates, or signal types may differ between two networks, yet their topologies may be identical. An example is a  local area network  (LAN). Any given node in the LAN has one or more physical links to other devices in the network; graphically mapping these links results in a geometric shape that can be used to describe the physical topology of the network. Conversely, mapping the data flow between the components determines the logical topology of the network. Topolog
Read more