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Pulldown (other)
Pulldown may refer to: * Pulldown (casting), a type of casting defect *Pull-down resistor, a type of resistor use *Pull-down assay, a biochemical protein extraction technique *Pull-down menu. See Menu (computing) Fitness *Pulldown exercise, a compound exercise designed to stress and develop the Latissimus dorsi. *A mark (Australian football) A mark in Australian rules football is the catch of a kicked ball which earns the catching player a free kick. The catch must be cleanly taken, or deemed by the umpire to have involved control of the ball for sufficient time. A tipped ball, or ... Media * Negative pulldown, the difference between 2-, 3-, and 4-perf movie camera frame movements * Pull-down curtain * Telecine, the methods of 3:2 pulldown in video conversion See also * Pull up (other) {{Disambig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pulldown (casting)
A casting defect is an undesired irregularity in a metal casting process. Some defects can be tolerated while others can be repaired, otherwise they must be eliminated. They are broken down into five main categories: ''gas porosity'', ''shrinkage defects'', ''mould material defects'', ''pouring metal defects'', and ''metallurgical defects''. Terminology The terms "defect" and "" refer to two specific and separate things in castings. Defects are defined as conditions in a casting that must be corrected or removed, or the casting must be rejected. Discontinuities, also known as "imperfections", are defined as "interruptions in the physical continuity of the casting". Therefore, if the casting is less than perfect, but still useful and in tolerance, the imperfections should be deemed "discontinuities". Types There are many types of defects which result from many different causes. Some of the solutions to certain defects can be the cause for another type of defect. The following de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pull-down Resistor
In electronic logic circuits, a pull-up resistor (PU) or pull-down resistor (PD) is a resistor used to ensure a known state for a signal. It is typically used in combination with components such as switches and transistors, which physically interrupt the connection of subsequent components to ground or to VCC. Closing the switch creates a direct connection to ground or VCC, but when the switch is open, the rest of the circuit would be left floating (i.e., it would have an indeterminate voltage). For a switch that is used to connect a circuit to VCC (e.g., if the switch or button is used to transmit a "high" signal), a pull-down resistor connected between the circuit and ground ensures a well-defined ground voltage (i.e. logical low) across the remainder of the circuit when the switch is open. For a switch that is used to connect a circuit to ground, a pull-up resistor (connected between the circuit and VCC) ensures a well-defined voltage (i.e. VCC, or logical high) when the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pull-down Assay
Immunoprecipitation (IP) is the technique of precipitating a protein antigen out of solution using an antibody that specifically binds to that particular protein. This process can be used to isolate and concentrate a particular protein from a sample containing many thousands of different proteins. Immunoprecipitation requires that the antibody be coupled to a solid substrate at some point in the procedure. Types Individual protein immunoprecipitation (IP) Involves using an antibody that is specific for a known protein to isolate that particular protein out of a solution containing many different proteins. These solutions will often be in the form of a crude lysate of a plant or animal tissue. Other sample types could be body fluids or other samples of biological origin. Protein complex immunoprecipitation (Co-IP) Immunoprecipitation of intact protein complexes (i.e. antigen along with any proteins or ligands that are bound to it) is known as co-immunoprecipitation (Co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Menu (computing)
In user interface design, a menu is a list of options or commands presented to the user of a computer or embedded system. A menu may either be a system's entire user interface, or only part of a more complex one. Navigation A user chooses an option from a menu by using an input device. Some input methods require linear navigation: the user must move a cursor or otherwise pass from one menu item to another until reaching the selection. On a computer terminal, a reverse video bar may serve as the cursor. Touch user interfaces and menus that accept codes to select menu options without navigation are two examples of non-linear interfaces. Some of the input devices used in menu interfaces are touchscreens, keyboards, mice, remote controls, and microphones. In a voice-activated system, such as interactive voice response, a microphone sends a recording of the user's voice to a speech recognition system, which translates it to a command. Types of menus A computer using a com ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pulldown Exercise
The pull-down exercise is a strength training exercise designed to develop the latissimus dorsi muscle. It performs the functions of downward rotation and depression of the scapulae combined with adduction and extension of the shoulder joint. The cable lat pull-down is done where the handle is moved via a cable pulley, as opposed to doing pull-downs on a leverage machine. Muscles The standard pull-down motion is a compound movement that requires dynamic work by muscles surrounding the three joints which move during the exercise. These are the elbow in conjunction with the glenohumeral and scapulothoracic joints in the shoulder girdle. Latissimus dorsi The latissimus dorsi performs extension and adduction of the arm directly to the spinal fascia. It bypasses the scapulae unlike other muscles which perform this function, so work performed by this muscle will not contribute to muscles that affect the scapulae. The lower sternal fibers of the pectoralis major also perform this role ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mark (Australian Football)
A mark in Australian rules football is the catch of a kicked ball which earns the catching player a free kick. The catch must be cleanly taken, or deemed by the umpire to have involved control of the ball for sufficient time. A tipped ball, or one that has touched the ground cannot be marked. Since 2002, in most Australian competitions, the minimum distance for a mark is 15 metres (16 yards or 49 feet). Marking is one of the most important skills in Australian football. Aiming for a teammate who can mark their kick is the primary focus of any kicking player not kicking for goal. Marking can also be one of the most spectacular and distinctive aspects of the game, and the best mark of the AFL season is awarded with the Mark of the Year, with similar competitions running across smaller leagues. The most prolific markers in the history of the Australian Football League, Nick Riewoldt, Matthew Richardson, Stewart Loewe and Gary Dempsey took an average of around eight marks per ga ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Negative Pulldown
Negative pulldown is the manner in which an image is exposed on a film stock, described in the number of film perforations spanned by an individual frame. It can also describe the orientation of the image on the negative, whether it is captured horizontally or vertically. Changing the number of exposed perforations allows a cinematographer to change both the aspect ratio of the image and the size of the area on the film stock that the image occupies (which affects image clarity). The most common negative pulldowns for 35 mm film are 4-perf and 3-perf, the latter of which is usually used in conjunction with Super 35. 2-perf, used in Techniscope in the 1960s, is enjoying a slight resurgence due to the birth of digital intermediate techniques eliminating the need for optical lab work. Vertical pulldown is overwhelmingly the dominant axis of motion in cinematography, although horizontal pulldown is used in IMAX, VistaVision (still in use for some visual effects work), and in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pull-down Curtain
A curtain is a piece of cloth or other material intended to block or obscure light, air drafts, or (in the case of a shower curtain), water. A curtain is also the movable screen or drape in a theatre that separates the stage from the auditorium or that serves as a backdrop/background. Curtains are often hung on the inside of a building's windows to block the passage of light. For instance, at night to aid sleeping, or to stop light from escaping outside the building (stopping people outside from being able to see inside, often for privacy reasons). In this application, they are also known as "draperies". Curtains hung over a doorway are known as portières. Curtains come in a variety of shapes, materials, sizes, colours, and patterns. They often have their own sections within department stores, while some shops are completely dedicated to selling curtains. Curtains vary according to cleanability, ultraviolet light deterioration, oil and dust retention, noise absorption, fire r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Telecine
Telecine ( or ) is the process of transferring film into video and is performed in a color suite. The term is also used to refer to the equipment used in the post-production process. Telecine enables a motion picture, captured originally on film stock, to be viewed with standard video equipment, such as television sets, video cassette recorders (VCR), DVD, Blu-ray Disc or computers. Initially, this allowed television broadcasters to produce programs using film, usually 16mm stock, but transmit them in the same format, and quality, as other forms of television production. Furthermore, telecine allows film producers, television producers and film distributors working in the film industry to release their productions on video and allows producers to use video production equipment to complete their filmmaking projects. Within the film industry, it is also referred to as a TK, because TC is already used to designate timecode. Motion picture film scanners are similar to telecines. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
