What does las mean?

1. Sodium linear alkylbenzene sulfonate

Chemical substance: Sodium linear alkylbenzene sulfonates (Linear Alkylbenzene Sulfonates), which is an alkylbenzene sulfonate substance National standard number of physical and chemical constants----CAS number Chinese name anionic detergent (LAS), English name Linear Alklybezene Sulfonates sodium salt of linear alkylbenzene sulfonates Alias ??anionic surfactant Molecular formula C18H29SO3X; CH3(CH2)9CH(CH3)C6H4SO3X Appearance and properties Molecular weight 344.4 (average) Vapor pressure Melting point Solubility Density Stability Danger mark: Low toxicity substance, lots of foam, strong irritation, and certain teratogenicity. Main uses: used as detergents, which have been gradually phased out, including a certain direct-selling dishwashing liquid that has been phased out due to LAS in the United States and South Korea. Usage: Usually used as household synthetic detergent, kitchen detergent for washing tableware and vegetables (currently eliminated in some countries); in addition to being used as a kitchen detergent, it is also used for the preparation of household cleaners, decontamination powder, etc. Ingredients, as well as detergents used in laundries, scouring aids used in the fiber industry, detergents, dyes, metal degreasing agents used in metal plating processes, resin dispersants used in the paper industry, felt detergents, deinking agents , emulsifiers used in the polymerization process of manufacturing resin emulsions, emulsifiers used in emulsions in the pesticide industry, dispersants used in granules and wettable powders, penetrating degreasing agents used in the leather industry, and anti-caking agents used in the fertilizer industry , air-entraining agents used in the cement industry and many other aspects, it is used as a compound component or alone; in recent years, it has also been applied in new technologies such as micellar solution oil flooding for tertiary recovery in oil extraction. Poison: LAS is toxic to animals and plants. Linear alkyl benzene sulfonate (LAS) and nonionic surfactant (NIS) are two types of surfactants with considerable production and consumption. The article discusses biodegradability, toxicity and accumulation in the environment and organisms Their environmental safety was analyzed from three aspects: surfactants are believed to have varying degrees of impact on the environment. LAS is toxic to animals and plants, and accumulates in the environment and in organisms (although it is easily degraded). Physical indicators: Poor hard water resistance and calcium soap dispersion ability, poor resistance to strong alkali. The aqueous solution of LAS becomes turbid as the water hardness increases until it is opaque; LAS has poor dispersion ability compared to the calcium soap of AES and alcohol ether carboxylic acid AEC and its salt AEC-Na. LAS and the environment: a water quality indicator in environmental testing or sewage treatment. Due to the widespread use of linear alkylbenzene sulfonates (LAS), LAS has become the most common representative type of organic pollutant in the environment. In the natural environment, it takes 20-22 days for LAS to become 100 % degradation, and its environmental behavior and environmental effects have also received widespread attention. Studies have shown that LAS causes chronic toxicity to fish at low concentrations. The migration and transformation behaviors of LAS such as adsorption, sedimentation and biodegradation in different environments are very complex.

2. League of Arab States

The League of Arab States - LAS for short, is the most representative and influential organization in the Arab world and the world's most influential organization. One of the earliest regional organizations established. In September 1944, at the initiative of Egypt, the foreign ministers of Arab countries held a meeting in Alexandria, drafted the "Alexandria Protocol", and decided to establish the League of Arab States. On March 22, 1945, representatives of seven Arab countries, namely Egypt, Syria, Iraq, Lebanon, Saudi Arabia, Yemen and Jordan, held a meeting in Cairo, the capital of Egypt, to formulate and adopt the Charter of the League of Arab States, declaring the formal establishment of the League of Arab States. The purpose of the League of Arab States is to close cooperative relations among member states, coordinate political activities among themselves, defend the independence and sovereignty of Arab countries, and comprehensively consider the affairs and interests of Arab countries; member states are responsible for economic, financial, transportation, cultural, Close cooperation in health, social welfare, nationality, passports, visas, execution of judgments and extradition; member states respect each other's political systems and shall not resort to force to resolve disputes between them. Treaties concluded between member states and other countries and The agreement is not binding on other Arab League member states. The Arab League Charter stipulates that the permanent address of the Arab League headquarters is in Cairo. As Egypt and Israel signed a peace treaty, on March 31, 1979, the Arab Ministers of Foreign Affairs and Economic Affairs decided to move the Arab League headquarters to Tunisia. On October 31, 1990, the Arab League headquarters moved back to Cairo. The Arab Summit (Arab League Summit) is the highest authority of the Arab League and the highest-level meeting between the Arab League and Arab countries. It mainly discusses major regional issues. The leadership body of the Arab League is the Council, which is composed of representatives of all member states. It holds a regular meeting in March or October every year, and can also convene special summits at any time at the request of two or more member states. The Council is chaired by member states on a rotating basis. Decisions taken by the Council are binding on all member states.

It consists of political, economic, cultural, transportation, social, legal, press, health, human rights, administrative and financial affairs agencies. The Secretariat is responsible for implementing the resolutions of the Council, with a Secretary-General, and a committee composed of the Deputy Secretary-General and the Secretary-General’s advisors to assist in its work. Other organizational structures of the Arab League include: Joint Defense Council, Economic and Social Council, etc. The current Secretary-General is Egyptian Amr Mahmoud Moussa. As of March 2006, the number of Arab League members has increased from the original 7 to 22 Arab countries, including the Palestine Liberation Organization. The Arab League has representative offices or press centers around the world. The Arab League established ties with China in 1956. In August 1993, the Arab League established a representative office in Beijing. China-Arab Economic and Trade Cooperation In January 2005, a special meeting of the Arab League Foreign Ministers Council was held at the Arab League headquarters in Cairo. Representatives at the meeting unanimously agreed to establish an Arab parliament. The members of the Arab Parliament will be composed of four representatives from each member country and have a secretary-general. They will hold regular meetings every six months. Their headquarters will be located in Damascus, the capital of Syria, with a transition period of five years. The parliament will finalize the responsibilities and scope of work of the future permanent Arab parliament. >> On December 27, 2005, the Transitional Parliament of Arab States was officially established and held its first meeting at the Arab League headquarters in Cairo. The Transitional Parliament of Arab States currently has no legislative power and will mainly focus on strengthening cooperation among Arab parliaments, promoting the reform of the Arab League Charter, and discussing issues such as strengthening the principles of the Arab League's cooperative working mechanism

3. Anion Surfactant

4. Lidar (lidar) data format

LAS is a standard LIDAR data format released in 2003 by the LIDAR Committee under the American Photogrammetry and Remote Sensing (ASPRS) agency. , after improvement, there are currently four versions, namely LAS1.0, 1.1, 1.2, and 2.0 (proposed version). Some LIDAR users have adopted LAS as the industry standard. The LAS standard format includes three parts, namely the public file header area, the variable length record area, and the format 0 point set record area. The public file header area records the general information of the LAS file, such as the number of points; the variable length recording area contains some metadata, such as the coordinate system used by the file; the format 0 point set recording area records the X, Y of the points ,Z and attributes. These three modules are closely connected and interconnected.

5. Long-run Aggregate Supply Curve

Long-run Aggregate Supply Curve/LAS

6. Link Activity Scheduler (LAS) )

Foundation Fieldbus (FF) is a token bus that requires one and only one link active scheduler (LAS) on each bus segment. As Media Access Control Center. LAS mainly has the following functions: ①Link scheduling. Any device on the bus segment can only communicate with the LAS. In FF, communication activities are divided into two categories: scheduled communication and non-scheduled communication. For these two communication activities, LAS adopts different scheduling methods. Scheduled communication corresponds to the publisher/subscriber virtual communication relationship (VCR), and only the publisher can accept periodic scheduling. LAS is based on a predetermined scheduling schedule. Once the time for a publisher to send is reached, LAS sends compulsory data (compel data, CD) to the publisher. After receiving this CD, the publisher sends the data in the buffer to the bus. For non-scheduled communication, LAS issues a pass token (PT) to a device outside the scheduled scheduling time. After receiving the PT, the device sends data to the bus. All devices on the bus have the opportunity to send unscheduled information in this way.