INTRODUCTION he term ‘Post-Impressionism’ has only one meaning: ‘after Impressionism’. PostImpressionism is not an art movement, nor an art style; it is a brief period at the end of the nineteenth century. Impressionism being a phenomenon unique to
French painting, the idea of Post-Impressionism is also closely linked to French art. Generally, the beginning of the Post-Impressionist era dates from 1886, from the moment of the eighth and final joint Impressionist Art exhibition. The era ends after 1900, running only into the first decade of the twentieth century. Although ‘Post-Impressionism’ and its chronological limits are well-defined, it seems that several Post-Impressionist works exist outside this period.
Despite this period’s extreme brevity, it is often described as an ‘era’ of Post-Impressionism.
In fact, this twenty-year period saw the emergence of such striking artistic phenomena, such varying styles of pictorial art and such remarkable creative personalities, that these years at the turn of the century can without a doubt be characterised as an ‘era’.
DBMS_JOB package is actually an API into an Oracle subsystem known as the job queue
. The Oracle job queue allows for the scheduling and execution of PL/SQL routines (jobs) at predefined times and/or repeated job execution at regular intervals. The DBMS_JOB package provides programs for submitting and executing jobs, changing job execution parameters, and removing or temporarily suspending job execution. This package is the only interface with the Oracle job queue.
DBMS_JOB is used to schedule many different types of tasks that can be performed in PL/SQL and that require regular execution. The job queue is used extensively by Oracle
replication facilities, and was originally developed for the purpose of refreshing Oracle snapshots. DBMS_JOB is often used by DBAs to schedule regular maintenance activities on databases, typically during periods of low usage by end users. It can similarly be used by applications to schedule large batch operations during off hours. The job queue can also be used to start up service programs that listen on database pipes and respond to service requests by user sessions.
Youll need the following items to complete this lab session. (The FK01 Forensic Science kit for this book, available from http://www.thehomescientist.com, includes the items listed in the first group.)
Spot plate, 12-well
Specimen: poppy seeds
Specimen: two questioned (see text)
Salt, table (use as known specimen)
Specimens: drug (optional; see text)
Watch, clock, or other timer
Perform this lab session only in a well-ventilated area. Most of the chemicals used to make up the presumptive test reagents are irritating, toxic, corrosive, mutagenic, carcinogenic, or all of those. Concentrated hydrochloric and sulfuric acids are corrosive. Formaldehyde and ammonium metavanadate are toxic. Read the MSDS for each chemical you use and follow the listed precautions. Wear splash goggles, gloves, and protective clothing.