Normally buttress dams are made of concrete and feature a series braces called buttresses along the downstream side of the dam to prevent the natural flow of water. The Daniel-Johnson Dam in Quebec, Canada is a multiple arch buttress dam.
SHA-1 HMAC Generation. In cryptography, a keyed-hash message authentication code (HMAC) is a specific construction for calculating a message authentication code (MAC) involving a cryptographic hash function in combination with a secret cryptographic key.he following is a Python implementation of HMAC-MD5: Python includes an hmac module, so the function above can be replaced by a shorter version. The following is a PHP implementation of HMAC-SHA1: PHP includes an hmac function, so the example above can be replaced by a shorter version.
Great Plains Asbestos Control, Inc. (GPAC) is a full service environmental remediation and demolition company. GPAC offers a range of services to public and private clients that include; building remediation and demolition, plant closure, plant de-commissioning and site reclamation. GPACâs staff are trained in abating asbestos, lead, mold, PCB, and mercury containing materials. With average tenure of 15 years, GPACâs supervisors offer clients the assurance that projects will be completed cost effectively, safely, compliantly and on time.