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Polyethylenimine (PEI) or polyaziridine is a polymer with repeating units composed of the amine group and two carbon aliphatic CH 2 CH 2 spacers. Linear polyethyleneimines contain all secondary amines, in contrast to branched PEIs which contain primary, secondary and tertiary amino groups.
Tracking is a method to build a track from a temporal sequence of data. Tracking applies to concurrent inflow of data. Tracing is a variant applying to any yet existing set of data as a retrospective. Both terms tracking and tracing originate from hunting.
It is a unique ID number or code assigned to a package or parcel. The tracking number is typically printed on the shipping label as a bar code that can be scanned by anyone with a bar code reader or smartphone. In the United States, some of the carriers using tracking numbers include UPS, [1] FedEx, [2] and the United States Postal Service. [3]
Tracking (commercial airline flight), the means of tracking civil airline flights in real time; Package tracking, or package logging, the process of localizing shipping containers, mail and parcel post; Track and trace, a process of determining the current and past locations and other status of property in transit
The service became quickly popular: for UPS the number of packages tracked on the web increased from 600 a day in 1995 [9] to 3.3 million a day in 1999. [10] On-line package tracking became available for all major carrier companies, and was improved by the emergence of websites that offered consolidated tracking for different mail carriers. [11]
One’s biological age, which measures the body’s physiological state, may help predict who is at risk for developing colon polyps, a known risk factor for colorectal cancer.
On the bottom of most bottles and plastic containers is a number code surrounded by a recycling emblem, ranging from 1–7, permitting these plastic items to be recyclable.* * For more than two decades, carbonated beverages in PEI were sold in reusable glass bottles redeemable at local grocery and convenience stores.
From January 2008 to December 2012, if you bought shares in companies when Peter C. Browning joined the board, and sold them when he left, you would have a 55.9 percent return on your investment, compared to a -2.8 percent return from the S&P 500.