Author:
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ISBN:
Category : Physical instruments
Languages : en
Pages : 66

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Author:
Publisher:
ISBN:
Category : Technology
Languages : en
Pages : 260

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Author: Ethel C. Marden
Publisher:
ISBN:
Category : Information storage and retrieval systems
Languages : en
Pages : 64

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Book Description
HAYSTAQ is a comprehensive computer system for searching chemical information and is particularly directed toward the stringent requirements of the U. S. Patent Office. The greatest activity to date has been in the design of a satisfactory method to search for chemical structures. A structure diagram is considered as a network, where the atoms or functional groups are the nodes and the bonds between them the links. The search algorithm consists of attempting to match, via a topological tracing, a question network (structure) against each structure in the file of chemical compounds stored on magnetic tape. The structure search includes provision for Markush structures and other generic concepts. Each of 385 questions was matched against a file of 2,400 entries containing (because of the Markush feature) effectively 162,000 compounds. The continuation of this work includes the use of the Hayward linear notation as input and extension of the search routines to other kinds of information associated with chemical structures. (Author).

Author:
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ISBN:
Category : Documentation
Languages : en
Pages : 1182

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Author:
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ISBN:
Category : Technology
Languages : en
Pages : 744

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Author:
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ISBN:
Category : Technology
Languages : en
Pages : 732

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Author: United States. National Bureau of Standards
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ISBN:
Category : Technology
Languages : en
Pages : 742

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Author: William A. Wildhack
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ISBN:
Category : Calibration
Languages : en
Pages : 720

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Book Description
NBS estimates of uncertainties associated with physical measurements, and with some NBS calibration services, are shown by 66 provisional 'accuracy charts.'Each chart is accompanied by a facing page giving a brief statement of the state of the art and tentative plans for NBS * work in areas where improvement is needed. (Author).

Author: Richard Conger Powell
Publisher:
ISBN:
Category : Calibration
Languages : en
Pages : 734

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Author: National Science Foundation (U.S.). Office of Scientific Information
Publisher:
ISBN:
Category :
Languages : en
Pages : 502

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