Hashing Techniques in Database Management Systems
For a huge database structure, it can be almost impossible to search all the index values through all its levels and then reach the destination data block to retrieve the desired data. Hashing is an effective technique to calculate the direct location of a data record on the disk without using an index structure.
Hashing uses hash functions with search keys as parameters to generate the address of a data record.
Hash Organization
Bucket − A hash file stores data in bucket format. A bucket is considered
Essential Instruments for Technical Drawing
Instruments Used in Technical Drawing
The completion of a technical drawing requires calculation, measurement, well-planned lines, precision, and a number of conditions that necessitate the use of good tools, good materials, and theoretical knowledge put into practice by a skilled drafter.
Drawing Board
A drawing board is a tool used to hold the paper for drawing. Usually constructed of smooth, flat wood or plastic, it has straight edges which enable movement of the T-square.
The size depends on the
Read MoreLaser Applications: Material Processing & Precision
Laser Applications in Material Processing
Stainless Steel Welding (1.5mm)
Material: Stainless Steel, 1.5mm thickness. Process: Welding. Requirements: Dimensional accuracy, moderate precision.
From an absorption perspective, Excimer lasers are optimal at room temperature. However, this application involves approximately 20µm penetration across multiple layers. As temperature increases, CO2 laser absorption rises from 10% to 90%, but this is undesirable as it leads to the stainless steel liquefying.
Read MoreElectrical Safety in Ports, Marinas & Furniture: ITC Standards
ITC 42: Electrical Systems in Ports and Marinas
1. Purpose and Scope.
The requirements of this instruction apply to electrical installations in ports and marinas, specifically for supplying power to pleasure boats. Receivers used in these facilities must meet the requirements of applicable European Directives, as provided for in Article 6 of the Regulation for Low Voltage Electrotechnics.
2. General.
Electrical installations in ports and for pleasure boats must be designed and constructed with materials
Read MoreSeat Belts and Pretensioners: Safety Systems in Modern Vehicles
Seat Belts and Pretensioners
Conventional Seat Belts
The primary function of a seat belt is to restrain passengers during a frontal collision or any event involving strong deceleration.
This restraint minimizes physical harm, particularly to the cervical region, head, and chest.
Additionally, the seat belt supports the body against the seat, preventing ejection from the vehicle.
A standard seat belt typically features two or three anchor points. The belt itself is made of durable fabric wound around
Read MoreUnderstanding TV Signal Distribution Networks: Components and Types
Understanding TV Signal Distribution Networks
Distribution networks in receiving systems for terrestrial TV utilize passive elements. These elements include terminals for interconnecting components and output connectors for users. Bandwidth, or frequency range, is a crucial parameter. Common bandwidths include 47 to 862 MHz for TV and radio, and 950 to 2150 MHz for terrestrial TV and satellite radio. The distribution of TV signals occurs via coaxial cable from the headend to the user.