ULN2803A Transistor Array Cropped
ULN can refer to : * Buyant-Ukhaa International Airport, Ulaanbaatar, Mongolia * Unbreakable Linux Network, a service of Oracle Corporation * Upper limit of normal, the high limit of a reference range * A series of a Darlington transistor arrays, e.g. ULN2003A The ULN2003A is an integrated circuit produced by Texas Instruments. It consists of an array of seven NPN Darlington transistors capable of 500 mA, 50 V output. It features common-cathode flyback diodes for switching inductive loads ...

Buyant-Ukhaa International Airport
Buyant-Ukhaa International Airport, formerly called Chinggis Khaan International Airport from 2005 to 2020 , is a semi-operational international airport serving Ulaanbaatar, Mongolia, situated southwest of the capital. Largely Chinggis Khaan International Airport, replaced by a new airport, it currently functions as a backup airport for the former, with a view to being used for flight training as well as for special, charter, and government flights. History Development The airport was first established as Buyant-Ukhaa Central Airport on 19 February 1957. In 1958, international flights began with flights to Irkutsk and Beijing using Ilyushin Il-14 aircraft. Regular flights from the airport started in 1961. The terminal was upgraded to make it suitable for international traffic in 1986. Following the Mongolian Revolution of 1990 and between 1994 and 1997 a further major upgrade of construction and air navigation was achieved with the assistance of the Asian Development Bank, m ...
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Unbreakable Linux
Oracle Linux (abbreviated OL, formerly known as Oracle Enterprise Linux or OEL) is a Linux distribution packaged and freely distributed by Oracle, available partially under the GNU General Public License since late 2006. It is, in part, compiled from Red Hat Enterprise Linux (RHEL) source code, replacing Red Hat branding with Oracle's. It is also used by Oracle Cloud and Oracle Engineered Systems such as Oracle Exadata and others. Potential users can freely download Oracle Linux through Oracle's server, or from a variety of mirror sites, and can deploy and distribute it without cost. The company's ''Oracle Linux Support program'' aims to provide commercial technical support, covering Oracle Linux and existing RHEL or CentOS installations but without any certification from the former (i.e. without re-installation or re-boot). Oracle Linux had over 15,000 customers subscribed to the support program. RHEL compatibility Oracle Corporation distributes Oracle Linux with two Linux k ...
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Reference Range
In medicine and health-related fields, a reference range or reference interval is the range or the interval of values that is deemed normal for a physiological measurement in healthy persons (for example, the amount of creatinine in the blood, or the partial pressure of oxygen). It is a basis for comparison for a physician or other health professional to interpret a set of test results for a particular patient. Some important reference ranges in medicine are reference ranges for blood tests and reference ranges for urine tests. The standard definition of a reference range (usually referred to if not otherwise specified) originates in what is most prevalent in a reference group taken from the general (i.e. total) population. This is the general reference range. However, there are also ''optimal health ranges'' (ranges that appear to have the optimal health impact) and ranges for particular conditions or statuses (such as pregnancy reference ranges for hormone levels). Value ...
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