DATA BASE LINK

DATA BASE LINK ( name name, name <user defined name Iist>, [name])... 

A data base link establishes a relation between a geometric object in the CAD data base and some information in the referenced data base. The information in the data base is identified by a list of user-defined names, but the type of information is not specified. Special programs or a human user may imply the type of information from the aspect. 

The concept of the Polymat database was based on the following criteria (1) the data-base is neutral, independent of raw-material manufacturers (2) anyone can use the database (3) all the products on. the European market should, if possible, be included (4) since testing is carried out in accordance with a variety of different international standards, the relevant standard, as well as the testing conditions, is registered (5) during the search, all properties should be capable of being linked with one another as desired and (6) the sources used for the database are the technical data sheets and additional information supplied by raw-material manufacturers, and various lectures, publications, and measured data from different institutes. 

Due to its modularity, the software comes in many parts (shown in Fig. 9). The Chemkin package is composed of four important pieces the Interpreter, the Thermodynamic Data Base, the Linking File, and the Gas-Phase Subroutine Library. The Interpreter is a program that first reads the user s symbolic description of the reaction mechanism. It then extracts thermodynamic information for the species involved from the Thermodynamic Data Base. The user may add to or modify the information in the data base by input to the Interpreter. In addition to printed output, the Interpreter writes a Linking File, which contains all the pertinent information on the elements, species, and reactions in the mechanism. 

Campbell K, Radcliffe C, Thomas RG, Grundman M, Thai L. Online subject randomization and drug ordering system using the web linked to central data base. Controlled Clin Trials 1999 20 2S 91S. 

The commercial testing lab may not need the data base of the R D lab nor the speed of the Quality assurance lab, but because of the immediate link between its operations and its economic success, a system would be deemed beneficial if it reduced cost per test, enhanced responsiveness to customers, or speeded the collection of receivables through automatic invoicing. 

Pollution and Toxicology (POLTOX). This CD-ROM library also focuses our attention on environmental health and safety concerns. Scientists working in any industry or capacity that deals with toxic or potentially toxic chemicals will find it very useful. It allows one access to seven major data bases in this field in a single search through its use of linking features in its software. The distributors of this product have provided us with a spectrum of information dealing with toxic substances and environmental health. 

The disconnections are transferred along with all the information they possess, including restrictions, bibliographic references, etc. It is also possible to transfer disconnections which form part of a sequence, but they must be transferred as individual disconnections. It is not possible to transfer a whole sequence at once you must transfer disconnection by disconnection and "link" once more the individual disconnections in the new data base. 

There are three data bases present in our MS/MS information management system, one for immediate experimental data and two for archival data. The experimenter s data base has been described elsewhere (1). One archival data base manages the MS/MS spectra, while the other manages the structures and substructures. The two archival data bases are logically linked together so that all information concerning a particular molecule or substructure is associated with its spectra. 

After the spectral matching process has been completed, the list of compounds with the top matching daughter spectra are identified and retrieved for each daughter spectrum in the reference compound. The molecular structures of the compounds with best matching spectra are drawn and compared for common substructures. The common substructures yield candidate spectrum/substructure correlations. Additional compounds are then tested to confirm or modify each correlation. Once the daughter spectrum is correlated with one or more substructures, this daughter spectrum is stored in the spectrum data base and is linked to the associated substructures stored in the structure data base. 

After we determined the concentrations of individual Isomers, we retrieved the data from the MUMPs based laboratory data base, and transferred them to an IBM-XT (IBM Corporation, Boco Raton, FL 33432) by way of a RS-232 link, using the program Cyber (Department of Linguistics, University of Illinois at Champaign-Urbana, Urbana, IL 61820). In performing principal components analyses, we used SIMCA-3B for MS-DOS based microcomputers (Principal Data Components, 2505 Shepard Blvd., Columbia, MO 65201). 

The NIOSH RTECS is the first non-spectroscopic CIS data base and has proven to be a very valuable addition to the CIS. Interest in the data base has been shown by many groups within EPA involved in the implementation of TSCA. For example, work is now underway to link spectral data with the NIOSH toxicity data so that as a result of a mass spectral identification, the EPA lab can quickly be informed if the chemical identified is toxic and hence requires immediate action. 

The RTECS data base can be searched in a number of ways, including NIOSH number, CAS Registry number, type of animal tested, route of dosage, LD50. LC50, etc. The NIOSH RTECS file is also linked to the SSS so that structure-activity correlation work can be performed. 

One of the first goals of the CIS was to produce a series of searchable chemical data bases for use by working analytical chemists with no especial computer expertise. A second aim was to link these data bases together so that the user need not be restricted to a consideration of for example, only mass spectral data. 

The various problems inherent in these plans included acquisition of data bases, design of programs, dissemination of the resulting system and linking, via CAS registration numbers, of the various CIS components. These problems, as has been described above, have been solved conceptually and, to a large extent, practically, and the CIS, as it now stands, is the result. It is now possible therefore to review the system in an effort to define future goals, and a number of these seem fairly clear. 

The modelling chain described in this section, linking the reference porewaters, radionuclide concentration limits, and sorption data bases, is summarized in Fig. 6. 

Integrating concentration- and effect-addition principles with (Q)SAR opens the door for (Q)SAR-based mixture assessments. As discussed above, linking interspecies correlations (Asfaw et al. 2004) with the USEPA s ECOSAR program allowed for the generation of species sensitivity distributions, hence a probabilistic estimate for aquatic community effects. Estimated HC5s for 4 chemicals were within a factor of 2 of published values, suggesting that current uncertainty factors overestimate NOECs established via data-based SSDs even SSDs derived... 

Products were analysed by x-ray diffraction using an automated Siemens D500 diffractometer (CuKOC radiation) linked to a proprietary data base. The overlap of the mazzite, mordenite and ECR-1 X-ray diffraction patterns makes these materials difficult to differentiate, particularly in mixtures, as shown in Figure 4. For impurity reference purposes the analcite pattern is included in this diagram. Indexed diffraction patterns of... 

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