EFE Matrix is a tool used in the business world, designed to assess current business conditions. It stands for External Factor Evaluation Matrix. It identifies critical succes…s factors for a company and assigns a weight to each factor. (MORE)
Electronic Fuel Injection Sometimes coded EF or EFI. ********* If we are to stay on the subject of photography, in the world ofCanon, it means "Electro-Focus" and is the gener…ation of bayonetstyle mount that followed the FD or "breech-lock" mount. An EF lensfocuses via electric motor within the lens. ********* In the context of meteorology, EF stands for the Enhanced Fujitascale, a system for rating the intensity of tornadoes tornadoescurrently used in the United States and Canada. The scale runs fromEF0 for the weakest tornadoes to EF5 for the strongest. (MORE)
\n E.F. Codd , the famous mathematician has introduce 12 rules for the relational model for databases commonly known as Codd's rules. The rules mainly define what is re…quired for a DBMS for it to be considered relational , i.e., an RDBMS. There is also one more rule i.e Rule00 which specifies the relational model should use the relational way to manage the database. The rules and their description is as follows:-\n.
\n Rule 000: A RDBMS system should be capable of using its relational facilities (exclusively) to manage the database .\n.
\n Rule 1 : The information rule : All information in the database is to be represented in one and only one way. This is achieved by values in column positions within rows of tables.\n.
\n Rule 2 : The guaranteed access rule : All data must be accessible with no ambiguity.This is achieved in the RDBMS by using the primary key concept.\n.
\n Rule 3: Systematic treatment of null values : The DBMS must allow each field to remain null. The null can be stored in any field of any datatype.\n.
\n Rule 4: Active online catalog based on the relational model : The authorized users can access the database structure by using common language i.e SQL.\n.
\n Rule 5: The comprehensive data sublanguage rule : The system must support at least one relational language that has simple syntax and transaction management facilities. It can be used in the application as well as in the RDBMS systems.\n.
\n Rule 6: The view updating rule : All views must be updatable by the system.\n.
\n Rule 7: High-level insert, update, and delete : The system is able to insert, update and delete operations fully. It can also perform the operations on multiple rows simultenously.\n.
\n Rule 8: Physical data independence : Changes to the physical storage structure must not require a change to an application based on the structure.\n.
\n Rule 9: Logical data independence : Changes to the logical level (tables, columns, rows, and so on) must not require a change to an application based on the structure.\n.
\n Rule 10: Integrity independence : All the Integrity constraints like primary key, uniques key etc must be specified separately from application programs and stored in the catalog.\n.
\n Rule 11: Distribution independence : The distribution of portions of the database to various locations should be invisible to users of the database.\n.
\n Rule 12: The nonsubversion rule : If the system provides a low-level (record-at-a-time) interface, then that interface cannot be used to subvert the system, for example, bypassing a relational security or integrity constraint.\n.
\n Note:- Any database management system which fulfills 6 or more than 6 rules can be considered as the RDBMS. \n.
\nMaulin Thaker\nCodd's Rule\n.
\nThere are 13 (0 to 12) rules which were presented by Dr. E.F.Codd ,in June 1970,in ACM (Association of Computer Machinery)\n.
\nRule 0. Relational Database management\nâA relational database management system must use only its relational capabilities to manage the information stored in the databaseâ. \n.
\nRule 1. The information rule\nAll information in the database to be represented in one and only one way, Namely by values in column positions within rows of tables.\n.
\nRule 2. Logical accessibility\nThis rule says about the requirement of primary keys. \nEvery individual value in the database must be logically addressable by specifying the name of table, column and the\nprimary key value of the row.\n.
\nRule 3. Representation of null values\nThe DBMS is required to support a representation of "missing information and inapplicable information" (for example, 0 'Zero' is different from other Numbers), This type of information must be represented by the DBMS in a systematic way (For example Null Character ).\n.
\nRule 4. Catalog Facilities\nThe system is required to support an on line, in line, relational data access to authorized users by using their Query language.\n.
\nRule 5. Data Languages. \nThe system must support a least one relational language (It may support more than one relational language) that \n(a) has a linear syntax, \n.
\n(b) can be used in two ways and within application programs, \n.
\n(c) supports data operations security and integrity constraints, and transaction management operations (commit).\n.
\nRule 6. View Updatability \nAll views that are theoretically updatable must be updatable by the system.\n.
\nRule 7. update and delete. \nThe system must support INSERT, UPDATE, and DELETE operators.\n.
\nRule 8. Physical data independence\nChanges to the physical level (how the data is stored, whether in arrays or linked lists etc.) must not require a change to an application based on the structure.\n.
\nRule 9. Logical data independence\nChanges made to tables to modify any data stored in the tables must not require changes to be made to application programs. Logical data independence is more difficult to achieve than \nphysical data independence.\n.
\nRule 10. Integrity Constraints\nIntegrity constraints must be specified separately from application programs and stored in the catalog. It must be possible to change such constraints when they are unnecessarily affecting existing applications.\n.
\nRule 11. Database Distribution \nThe RDBMS may spread across more than one system and across several networks, however the tables should appear in same manner to every user like local users.\n.
\nRule 12. The Non Subversion rule\nIf the system provides a low-level interface, then that interface cannot be used to weaken the system (e.g.) bypassing a relational security or integrity constraint. (MORE)
Not sure if this is the same EF & EF you were looking for- but- EF & EF industries was a decorative lamp company in Chicago during the 70's. They made huge (25+ inches in heig…ht) ornate glass lamps. I have an amber one with a nightlight in the base- very pretty if you like 70's vintage. I don't know if they still exist but the lamps are worth 70$ nowadays- last I heard. (MORE)
either the coil is cactus or the ignition module. i'd start there. fords have problems cos the coils overheat due to lack of cold air flow and they crack. this usually causes …the ignition module to fail. if you change one, you change the other..
also bad earths cause ignition modules to fail. (MORE)
EF refers to the condition or grading of the coin, it means "Extremely Fine". An "Extremely Fine" coin should show some slight signs of wear that are barely noticeable to the… naked, unassisted eye. (MORE)
EFE Matrix method is a strategic management tool often used for assesment of current business conditions. The EFE matrix is a good tool to visualize and prioritize the opportu…nities and threats business is facing. (MORE)
Yes. EF5 is the highest and most destructive category on theEnhanced Fujita scale. Fortunately they are also very rare. Sincethe scale was adopted in 2007 there have been nine… tornadoes ratedEF5. (MORE)
Yes. It is a variation of the prefix "Ex-." It means "out of," "from," and hence "utterly," "thoroughly," and sometimes imparting a privative or negative force or indicating a… former title, status etc. (MORE)
"EF", or alternately "XF", is the abbreviation for a major gradeclassification called "Extremely Fine". Within that majorclassification there are two subcategories, EF-40 and …EF-45. EF-45is often called "Choice Extremely Fine" to distinguish it fromEF-40. Specifically, .
A coin graded EF-40 may have a slight amount of wear overall,but its features are otherwise sharply defined. Traces of mintlustre may still be visible. .
A coin graded EF-45 has light wear only on its high spots, andall details are very sharp. Mint lustre is readily visible onsignificant parts of the coin. Source: United States Mint (MORE)
An EF5 is the highest of six categories (EF0 to EF5) on the Enhanced Fujita scale and the strongest type of tornado with estimated winds of over 200 mph (322 km/h). Tornadoes …this strong are absolutely devastating. Well-built houses are wiped clean off their foundations and large, well constructed buildings are reduced to rubble. Fortunately they are very rare, with only 1 tornado in every 2000 being rated this high. (MORE)
EF (or XF) stands for Extra Fine (sometimes also called ExtremelyFine), one of the higher grades for a circulated coin. An EF coinwill have very slight wear on the high points… of the design but noother evidence. (MORE)
EF1 and EF2 are ratings on the Enhanced Fujita scale, which uses the damage a tornado does to assign it to one of six strength categories which run from EF0 at the weakest to …EF5 at the strongest. An EF1 tornado has estimated winds of 86-110 mph. It is considered a relatively weak tornado with typical damage including broken windows, badly damaged roofs, and overturned trailers. An EF2 tornado with winds of 111-135 mph is considered the beginning of a strong tornado. Typical Ef2 damage includes roofs torn from well-built houses, and trailer homes completely destroyed. (MORE)
Step 1 - Remove the Center Radio Fascia. remove the ashtray and remove the 2 screws that hold the bottom of the "center radio fascia" in. pull the bottom of the "center radi…o facia" out to reveal the upper retaining clips that hold the top in. remove the clips and the fascia. on some models you'll also need to unplug the cigarette lighter as well. Step 2 Disconnect the Battery ground cable Step 3 Remove the Instrument Surround Facia. There are 3 screws above the instruments and two along the bottom of the fascia. one on either side of the steering column. Partially remove the fascia, so you can unplug the switches that are built into the fascia. boot release, fuel door release, rear demister, etc. Once all the switches built into the fascia have been unplugged you can fully remove the fascia. The BCM is about the same size as a book and is located in front of your left knee when sitting in the driving position. it can be several different colors, including blue or yellow Step 4 loosen the BCM mounting screws and Unplug the wiring loom plugs from the module, depending on your model and features there may be 2 or 3 plugs. loosen the BCM mounting screws and remove the BCM Done There 3 basic unit types Standard basic unit = 2 plugs Mid series unit - includes power windows = 3 plugs High series unit - includes power antenna = 3 plugs If you are replacing the BCM, take note of the code printed on the unit and be sure to get a replacement unit with a matching code. (MORE)
EFE means the external factor evaluation matrix, it lists a series of company's external opportunities and threats, and evaluate these factors' importance from a scale of 0-1 …so that they will finally add up to one. Rate how well the company is handling these factors from 1-4, then you get a score. If it's below 2.5 you are doing bad, if it's beyond 2.5 then you know your company is doing okay. (MORE)
Canon EF lens mount was introduced in 1987. It is the standard lens for Canon EOS family of SLR films and digital cameras. The EF or Electronic Focus is handled by a dedicated… electronic motor which is built into the lens. (MORE)